JPH11194702A - Display device and hologram reproducing method in display device - Google Patents

Abstract

(57) [Summary] [Problem] To provide a display device and a hologram in a display device capable of changing the display content of a hologram without requiring a mechanical configuration, having a simple configuration, and having a small hologram plate and a device configuration Provide a playback method. SOLUTION: This display device 1 is for a vehicle, a hologram plate 3 for displaying a vehicle speed in three-dimensional segments by numbers and graphs, a plurality of illuminating devices A1 to An and their respective illuminations. A light source unit 5 having an illumination control unit 7 for controlling on / off of the devices A1 to An. A plurality of three-dimensional images for three-dimensional display are multiplex-recorded on the hologram plate 3 so as to be reproduced independently from each other by reproduction illumination light emitted from different directions, and each of the illumination devices A1 to An Thus, the reproduction illumination light is emitted from the irradiation direction corresponding to the three-dimensional image to be reproduced, and a predetermined speed display is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device for displaying various types of visual information using a hologram, and a hologram reproducing method in the display device.

[0002]

2. Description of the Related Art A conventional display device using a hologram is disclosed in Japanese Patent Application Laid-Open No. 1-502297. This display device performs a meter display such as a vehicle speed meter using a hologram, and displays a first hologram plate for displaying a dial image and a pointer image on the dial image. A second hologram plate for indicating hands. The first and second hologram plates are provided on the front surface of the driver's seat in a superposed state, and rotate the second hologram plate for displaying the hands with respect to the first hologram plate for displaying the dial. By driving and rotating the pointer image on the dial image, a predetermined meter display is performed.

Further, in this display device, since a light source for reproduction illumination light is provided at a position distant from the rotation axis of the second hologram plate, light from the light source is converted into light along the rotation axis direction. A converter hologram for conversion is provided between the light source and the first and second hologram plates.

[0004]

However, in the above-mentioned conventional display device, a mechanical structure for rotating and driving the second hologram plate for displaying the hands is required, and the structure becomes complicated and large. There is a problem.

[0005] Further, there is a problem that the intensity of the reproduction light tends to be insufficient in the reproduced image formed by the conventional hologram plate, and the reproduced image tends to be unclear.

In view of the above problems, the first aspect of the present invention
It is an object of the present invention to provide a display device which can change the display content of a hologram without requiring a mechanical configuration and has a simple configuration.

A second object of the present invention is to provide a hologram plate and a display device capable of reducing the size of the device and a hologram reproducing method in the display device.

Further, a third object of the present invention is to provide a display device and a hologram reproducing method in the display device which can clearly display a reproduced image by the hologram plate.

[0009]

The technical means for achieving the above object according to the first invention is a method of combining a predetermined segment of a plurality of segments arranged according to a predetermined arrangement rule with a predetermined combination. A display device that displays predetermined visual recognition information by displaying, and changes the display content of the visual recognition information by changing the combination of the segments to be displayed, wherein a plurality of the plurality of segments respectively configuring the plurality of segments are displayed. A plurality of hologram plates, in which images are multiplex-recorded as interference fringes so that the images are reproduced independently from each other by reproduction illumination light emitted from different irradiation directions, and a plurality of images are provided according to the number of the images, Illuminating means for irradiating the reproduction illumination light toward the hologram plate from the irradiation direction, and display contents of the visual recognition information to be displayed Correspondingly, by turning on and off the plurality of illumination means, characterized in that it comprises an image selection means for selecting an image to be reproduced from among the plurality of images recorded on the hologram plate.

[0010] Preferably, the plurality of segments formed by the plurality of images are for displaying a predetermined numerical value as a segment by a number or a graph.

According to a third aspect of the present invention, there is provided a digital camera, wherein a plurality of images for displaying predetermined visual information are recorded as interference fringes in mutually independent recording areas. A hologram plate for reproducing the image corresponding to the interference fringes when the interference fringes recorded in the respective recording areas are irradiated with a predetermined reproduction illumination light, and a light source for irradiating the reproduction hologram light to the hologram plate Unit and
Two hologram plates each of which is provided between the light source unit and the hologram plate so as to cover at least a region where the interference fringes are recorded, and has predetermined transparent electrodes formed on surfaces facing each other; Having a predetermined liquid crystal layer sandwiched between the transparent substrates of the hologram plate, the reproduction reference light from the light source unit which is incident from the light source unit side and is emitted toward each of the recording areas of the hologram plate. By changing an applied voltage applied between the transparent electrodes in response to an input predetermined control signal, a liquid crystal panel that can be independently transmitted or cut off for each of the recording areas, and Image selecting means for selecting an image to be reproduced from the plurality of images recorded on the hologram plate by controlling a liquid crystal panel. And butterflies.

Preferably, the liquid crystal panel has an outer shape larger than the hologram plate, and the light source unit irradiates the reproduction illumination light to the entire surface of the liquid crystal panel. The selecting unit controls the light transmittance of a portion of the liquid crystal panel facing the recording area of the hologram plate through the control signal, thereby selecting one of the plurality of images recorded on the hologram plate. Select the image to be reproduced from
It is preferable that predetermined visibility information is displayed on the periphery of the liquid crystal panel by controlling the light transmittance of the periphery of the liquid crystal panel not facing the hologram plate through the control signal.

Preferably, when the plurality of images are reproduced, a predetermined numerical value is displayed as a number or a segment in a graph.

Still preferably, in the liquid crystal panel of the liquid crystal panel, a polarization direction conversion type liquid crystal layer in which a twist angle of a polarization direction of incident light changes with a change in an applied voltage applied between the transparent electrodes. And a predetermined polarizing plate is preferably provided on the outer surface side of the two transparent substrates.

Preferably, the liquid crystal layer of the liquid crystal panel is a polymer-dispersed liquid crystal layer in which the transmittance of incident light changes according to a change in a voltage applied between the transparent electrodes. Is good.

The technical means for achieving the object corresponding to the eighth invention is that a plurality of images for displaying predetermined visual information are mutually stored in a plurality of recording areas provided according to a predetermined arrangement rule. Independently recorded as interference fringes, the interference fringes recorded in the respective recording areas are irradiated with predetermined reproduction illumination light from the back side, and the image corresponding to the interference fringes is reproduced on the front side. A hologram plate, and a liquid crystal element having a liquid crystal layer formed between two transparent substrates, which are disposed opposite to each other on the back surface side of the hologram plate and have predetermined transparent electrodes formed on the surfaces facing each other, While irradiating the reproduction illumination light so as to be incident on any one of the plurality of recording areas on the hologram plate via the liquid crystal element, the reproduction illumination light is incident on the liquid crystal element. A light source unit and a traveling direction of the reproduction illumination light from the light source unit incident on the liquid crystal layer by changing an applied voltage applied between the two transparent electrodes of the liquid crystal element to change a refractive index of the liquid crystal layer. Is changed, and by controlling the position of incidence of the reproduction illumination light on the hologram plate, a recording region where the reproduction illumination light is to be incident is selected from the plurality of recording regions and recorded on the hologram plate. Image selecting means for selecting an image to be reproduced from the plurality of images.

A technical means for achieving the above object corresponding to the ninth invention is a display device for displaying predetermined visual information, wherein a plurality of images for displaying the visual information are formed as interference fringes. A hologram plate that has been recorded and the plurality of images are multiplex-recorded so as to be reproduced independently of each other by reproduction illumination light of different wavelengths, and a plurality of hologram plates are provided corresponding to the plurality of images individually. A plurality of irradiation means for irradiating the hologram plate with reproduction illumination light having the wavelength corresponding to a corresponding image of the plurality of images, and controlling the plurality of irradiation means on and off to form the hologram. Image selection means for selecting an image to be reproduced from the plurality of images recorded on the plate,
It is characterized by having.

The technical means for achieving the object corresponding to the tenth invention is that a plurality of images for displaying predetermined visual information are recorded as interference fringes, and the plurality of images are A hologram plate that is multiplex-recorded so as to be reproduced independently of each other by reproduction illumination light of different wavelengths, and the hologram includes light that includes at least light components of a plurality of wavelengths necessary for reproducing the plurality of images. A light source unit for irradiating the plate, and a liquid crystal layer is provided between two transparent substrates having transparent electrodes formed on opposite surfaces of the hologram plate and the light source unit. Liquid crystal element, and a high reflection and transmission surface provided on both surfaces of the liquid crystal element, and while reflecting incident light from the light source unit between the two high reflection and transmission surfaces, A wavelength selection unit that emits, to the hologram plate side, only light of a wavelength component corresponding to an optical path length between the two high reflection / transmission surfaces by emitting the light to the hologram plate side by emitting the light to the hologram plate side. By changing the applied voltage applied between the two transparent electrodes of the liquid crystal element provided in the wavelength selection means, by changing the refractive index of the liquid crystal layer to control the optical path length between the high reflection and transmission surfaces, An image selection unit that controls a wavelength component of the reproduction illumination light that passes through the wavelength selection unit and enters the hologram plate, and selects an image to be reproduced from the plurality of images recorded on the hologram plate; , Is provided.

The technical means for achieving the object corresponding to the eleventh invention is that a plurality of images for displaying predetermined visual recognition information are recorded as interference fringes, and the plurality of images are A hologram plate which is multiplex-recorded so as to be independently reproduced by reproduction illumination lights having different polarization directions, a light source unit for irradiating the hologram plate with predetermined light serving as the reproduction illumination light, and the hologram A liquid crystal element provided between a plate and the light source unit and having a liquid crystal layer provided between two transparent substrates having transparent electrodes formed on surfaces facing each other, and a light source unit side of the liquid crystal element A polarizing plate provided on the surface of the hologram plate, wherein the light emitted from the light source unit is used as the reproduction illumination light through the polarizing plate and the liquid crystal element as the hologram plate. By making the light incident, the applied voltage applied between the two transparent electrodes is changed in accordance with the input control signal to change the twist angle of the polarization direction of the light while the light passes through the liquid crystal layer. A polarization direction conversion means for converting the polarization direction of the reproduction illumination light incident on the hologram plate, and controlling the torsion angle through the control signal to change the polarization direction of the reproduction illumination light incident on the hologram plate. Image selecting means for controlling and selecting an image to be reproduced from the plurality of images recorded on the hologram plate.

A technical means for achieving the above object corresponding to the twelfth invention is a display device for displaying predetermined visual information, wherein two transparent electrodes having predetermined transparent electrodes formed on opposing surfaces are provided. A liquid crystal element in which a liquid crystal layer is provided between the transparent substrates, and the refractive indices of the two transparent substrates and the refractive indices of the transparent electrodes formed on the respective transparent substrates are different from each other between the two transparent substrates. A light source unit for irradiating predetermined light so that irradiation light is incident on one of the two transparent substrates of the liquid crystal element;
Along with being disposed in close contact with the surface of the other transparent substrate of the two transparent substrates, a plurality of images for displaying the visual recognition information are generated by the light from the light source units having different incident angles from each other. The multiplexed recording is performed as interference fringes so as to be reproduced independently of each other, and the applied voltage between the transparent electrodes of the liquid crystal element is changed to change the refractive index of the liquid crystal layer. When the incident angle of the light is changed, the light is applied between the hologram plate for reproducing the image corresponding to the changed incident angle from the plurality of images and the transparent electrodes of the liquid crystal element. By changing the applied voltage and controlling the refractive index of the liquid crystal layer, the angle of incidence of the light from the light source unit on the hologram plate is controlled, and the complex recorded on the hologram plate is controlled. An image selection means for selecting an image to be reproduced from among the image of, characterized in that it comprises a.

A technical means for achieving the above object corresponding to the thirteenth invention is a display device for displaying predetermined visual information, wherein each of the display devices has predetermined transparent electrodes and is provided on an inner surface facing each other. A hologram plate is used for one of the two transparent substrates sandwiching the liquid crystal layer, and the transparent electrode is provided on the hologram plate so that the hologram plate comes into direct contact with the liquid crystal layer. Hologram reproducing means provided on the outer surface of the hologram reproducing means, and irradiating predetermined light toward the other transparent substrate of the two transparent substrates provided in the hologram reproducing means so that the irradiated light is incident thereon. A light source unit and a refractive index of the liquid crystal layer are changed by changing an applied voltage between the two transparent electrodes provided on the two transparent substrates provided in the hologram reproducing means. And a plurality of images for displaying the visual recognition information are independently reproduced by the light from the light source units having different incident angles on the hologram plate. Are multiplex-recorded as interference fringes, the image selecting means changes the applied voltage between the two transparent electrodes of the hologram reproducing means to change the refractive index of the liquid crystal layer, and the light from the light source unit is By controlling the angle of incidence on the hologram plate, the image corresponding to the angle of incidence is selected from the plurality of images and reproduced.

A technical means for achieving the above object corresponding to the fourteenth invention is that a predetermined image for displaying predetermined visual information is recorded as interference fringes, and a predetermined reproduction is performed on the interference fringes. A hologram plate that reproduces the image when irradiated with illumination light, a light source unit that irradiates the reproduction illumination light to the hologram plate, a screen on which the image reproduced by the hologram plate is projected, and A lens for enlarging a projected image of the projected image.

The technical means for achieving the above object corresponding to the fifteenth invention is formed of a member having a light transmitting property, and an image for forming a display image for displaying predetermined visual recognition information is provided. A hologram plate that is recorded as an interference fringe on a predetermined recording area and reproduces the image when the interference fringe is irradiated with a predetermined reproduction illumination light, and a hologram plate that covers at least the recording area of the hologram. The reproduction illumination light is emitted by emitting light at a portion facing the front recording area of the hologram plate, and the portion of the hologram plate that does not face the recording area emits light. A display element for displaying a predetermined image forming the display image together with the image reproduced by the hologram plate, and a display element in front of the hologram plate in the display element By controlling the light emission state of the portion and the portion that does not face opposite the recording area,
Control means for controlling display contents of the display image constituted by the image reproduced by the hologram plate and the image displayed by the display element.

Preferably, the display image is for performing a predetermined meter display, and the image reproduced by the hologram plate constitutes a dial image for the meter display, and is displayed by the display element. The displayed image may constitute a pointer image for the meter display.

[0025] Preferably, the image recorded on the hologram plate is a three-dimensional image for displaying the visual recognition information three-dimensionally.

A technical means for achieving the object corresponding to the eighteenth invention is a hologram reproducing method for a display device according to any one of claims 1 to 17, wherein said image is formed on said hologram plate. Object light and reference light at the time of recording, and using divergent light whose illumination area expands as the distance from a substantial light source point to the reproduction illumination light and the light source points of the object light and the reference light The respective distances from the center point of the interference fringes recorded on the hologram plate, the respective incident angles of the object light and the reference light with respect to the center point of the interference fringes, and the wavelengths of the object light and the reference light The distance between the light source point of the reproduction reference light and the center point of the interference fringes, the incident angle of the reproduction illumination light with respect to the center point of the interference fringes, and the reproduction illumination light By adjusting the wavelength in accordance with a predetermined rule, characterized by reproducing the image to expand larger than the image recorded on the hologram plate.

Preferably, the image reproduced by the hologram plate is projected on a screen.

[0028]

BEST MODE FOR CARRYING OUT THE INVENTION First Embodiment FIG. 1 is a diagram showing an overall configuration of a display device according to a first embodiment corresponding to the first, second, and seventeenth inventions.
FIG. 2 is a front view of a hologram plate provided in the display device, and FIG.
It is a figure which shows the structure of a two-dimensional image in plane.

The display device 1 includes a hologram plate 3 and a light source unit 5. Light source unit 5
Are a plurality of (n) lighting devices (lighting means) A1 to A1
n and an illumination control unit (image selection means) 7 for controlling on / off of each of the illumination devices A1 to An. The display device 1 configured as described above is installed on an instrument panel or the like in front of the driver's seat of the vehicle, and three-dimensionally displays predetermined visual information necessary for the operation of the vehicle, here, the vehicle speed by the hologram plate 3. It is supposed to.

In the present embodiment, the vehicle speed is displayed as a segment in a number and also as a segment in a graph. In response to this, the hologram plate 3 is schematically shown by a virtual line in FIG. As shown, a plurality of three-dimensional images S for segmentally displaying the vehicle speed by numerals.
1 to S16 (hereinafter, simply referred to as “S” when collectively referred to), a plurality of vehicles arranged in accordance with a predetermined arrangement rule (here, along a substantially arcuate curve) for segmentally displaying the vehicle speed in a graph. A plurality of three-dimensional images B1 to Bm (hereinafter, simply referred to as "B") constituting the segment are recorded as interference fringes for hologram display.

As shown in FIG. 3, two of the three-dimensional images S1 and S2 of the plurality of three-dimensional images S reproduced by the hologram plate 3 are "1" at the hundredth digit of the numerical value indicating the vehicle speed.
Are formed, and the seven three-dimensional images S3 to S9 and S10 to S16 are
The seven-segment for displaying the numerical value indicating the vehicle speed in the tens place and the ones place of “0” to “9” is respectively constituted, and the three-dimensional image S of these 16 three-dimensional images S Are reproduced in a predetermined combination, so that the vehicle speed is segmentally displayed by numerals.

The plurality of three-dimensional images B reproduced by the hologram plate 3 form a bar graph for segmentally displaying the vehicle speed in the form of a graph. By increasing the three-dimensional image B to be reproduced in order from the three-dimensional image B1 to the highest-order three-dimensional image Bm, the vehicle speed is displayed as a segment in a graph.

In the present embodiment, the three-dimensional images S and B have different irradiation directions of the reference light at the time of recording so that the three-dimensional images S and B are reproduced independently from each other by the reproduction illumination light irradiated from different directions. The hologram plate 3 is multiplex-recorded, and accordingly, the illumination devices A1 to An of the light source unit 5 are provided for each of the three-dimensional images S and B, and the illumination devices A1 to An are Each corresponding 3
Reproduction reference beams C1 to C for reproducing the two-dimensional images S and B
n is applied to interference fringes for reproducing the three-dimensional images S and B of the hologram plate 3, respectively.

A signal indicating the value of the vehicle speed is externally input to the lighting control unit 7, and the lighting control unit 7 determines which of the lighting devices A1 to An to be turned on based on the input signal. By deciding and turning on the lighting devices A1 to An in a predetermined combination according to the vehicle speed,
The three-dimensional images S and B to be reproduced are selected.

The hologram plate 3 is a transmission type hologram plate. When the reproduction illumination light C1 to Cn is irradiated from the back side by the plurality of illumination devices A1 to An in this way, the hologram on the front side is obtained. 3 for displaying the vehicle speed in a predetermined space 9 between the board 3 and the driver
The dimensional images S and B are three-dimensionally reproduced in a predetermined combination, as shown in FIGS. Here, in FIG.
Arrow 11 indicates the driver's viewing direction.

As described above, according to the present embodiment, the vehicle speed, which is the visual information necessary for the operation of the vehicle, is three-dimensionally displayed by the hologram plate 3, so that the visibility of the visual information is improved. Can be improved.

Further, a plurality of three-dimensional images S and B necessary for displaying the vehicle speed by numbers and graphs are represented by:
Since multiplexed recording is performed on a single hologram plate 3 so as to be reproduced independently of each other by reproduction illumination light C1 to Cn whose incident directions are different from each other, it is not necessary to provide a plurality of hologram plates. Cost reduction can be achieved, and the reproduction illumination light C1 to Cn
The display contents of the reproduced three-dimensional images S and B can be changed in accordance with the ever-changing vehicle speed only by turning on and off the plurality of lighting devices A1 to An that irradiate the light, and a mechanical configuration is required. However, there is an advantage that the configuration is simple.

In the present embodiment, the vehicle speed is displayed three-dimensionally. However, other visual information such as a shift position of the automatic transmission, a clock, various warning displays such as an odometer and a battery indicator are displayed. You may make it display dimensionally.

2. Second Embodiment FIG. 6 is a diagram showing an overall configuration of a display device according to a second embodiment corresponding to the third to seventh and seventeenth inventions, and FIG. 7 is a hologram plate provided in the display device. FIG. 8 is a plan view showing a configuration of a three-dimensional image reproduced by the hologram plate, and FIG. 9 is a front view of a liquid crystal panel provided in the display device.

The display device 21 includes a hologram plate 23
And the hologram plate 23 on the back side of the hologram plate 23
A liquid crystal panel 25 disposed so as to cover the entire surface of the
The light source unit 27 is provided on the back side of the liquid crystal panel 25, and a control unit (image selecting means) 29 for controlling the liquid crystal panel 25 and the light source unit 27 is provided. The display device 21 configured as described above is installed on an instrument panel or the like in front of the driver's seat of the vehicle,
The predetermined holographic information necessary for the operation of the vehicle, that is, the vehicle speed in this case, is three-dimensionally displayed on the hologram plate 23. Here, the hologram plate 23, the liquid crystal panel 25, and the light source unit 27 are integrated.

In the present embodiment, the vehicle speed is segmentally displayed by numerals, and correspondingly, the vehicle speed is displayed on the hologram plate 23 as schematically shown by phantom lines in FIG. A plurality of three-dimensional images S1 to S16 (hereinafter simply referred to as “S”) for segment display by numbers are recorded as interference fringes for hologram display.

As shown in FIG. 8, the hologram plate 23
The two three-dimensional images S1 and S2 of the plurality of three-dimensional images S reproduced by constitute two segments for displaying “1” of the hundredth digit of the numerical value indicating the vehicle speed,
Seven three-dimensional images S3 to S9 and S10 to S1
Numeral 6 designates seven segments for displaying the numerical values indicating the vehicle speed in the tens place and the ones place of “0” to “9”, respectively, and three of these sixteen three-dimensional images S constitute three segments. By reproducing the dimensional image S in a predetermined combination,
The vehicle speed is segmentally displayed by a number.

In the present embodiment, each such three-dimensional image S
Are the corresponding predetermined recording areas D1 to D16 of the hologram plate 23 (hereinafter, collectively referred to simply as "D")
Are recorded individually in a state independent of each other, so that when each recording area D is irradiated with reproduction illumination light, only the three-dimensional image S recorded in the recording area D irradiated with the reproduction illumination light is reproduced. Has become.

The liquid crystal panel 25 includes a liquid crystal element 25a having a liquid crystal layer formed in a plurality of predetermined regions E1 to E16 (hereinafter, simply referred to as "E") between two transparent substrates, Polarizing plates 25b and 25c provided on both sides of the liquid crystal element 25a, and a portion of each of the inner surfaces of the two transparent substrates facing each of the regions E where the liquid crystal layer is formed includes: A transparent electrode is formed.
The liquid crystal layer used in the liquid crystal element 25a is a polarization direction conversion type liquid crystal layer in which the twist angle of the polarization direction of the incident light changes as the applied voltage applied by the transparent electrodes on both sides changes. Have been.

Each liquid crystal layer forming region E of the liquid crystal panel 25
Each of the recording areas D of the hologram plate has a one-to-one correspondence with each other, and has substantially the same shape so that they are exactly opposed to each other when the liquid crystal panel 25 and the hologram plate 23 are overlapped. The light source units 2 which are provided in the same positional relationship and which have passed through each liquid crystal layer formation region E
Light from 7 (reproduction illumination light) is incident only on the corresponding recording area D of the hologram plate 23. The portion of the liquid crystal panel 25 other than the liquid crystal layer formation region E is
A predetermined light-shielding process is performed, so that light from the light source unit 27 can pass only through the liquid crystal layer forming region E.

The liquid crystal panel 25 has a control unit 29
The voltage applied to the liquid crystal layer of each liquid crystal formation region E is changed based on the signal input from the liquid crystal display device, and the twist angle of the polarization direction generated while the light from the light source unit 27 passes through each liquid crystal layer formation region E Is changed, the light transmittance of each liquid crystal layer forming region E is changed, and the light from the light source unit 27 transmitted to the hologram plate 23 through the liquid crystal layer forming region E is transmitted or blocked. I do. On the other hand, the light source unit 27 irradiates the reproduction illumination light to at least the entire area of the hologram plate 23 where the three-dimensional image S is recorded.

A signal indicating the value of the vehicle speed is externally input to the control unit 29.
Performs on / off control of the light source unit 27,
Based on the input signal, the liquid crystal layer forming region E through which the light from the light source unit 27 is to be transmitted is determined from a plurality of liquid crystal layer forming regions E of the liquid crystal panel 25 in a predetermined combination according to the vehicle speed. , The three-dimensional image S to be reproduced
Select

The hologram plate 23 is a transmission type hologram plate, and the light source unit 27 which has passed through each liquid crystal layer forming region E of the liquid crystal panel 25 which has been changed from a light-shielded state to a light-transmitted state in a predetermined combination in this way. When the reproduction illumination light from the camera is irradiated from the back side, a three-dimensional image S indicating the vehicle speed is displayed in a predetermined space 31 between the hologram plate 23 and the driver on the front side, as shown in FIG. As shown in FIG. 11, three-dimensional reproduction is performed in a predetermined combination.
Here, in FIG. 6, an arrow 33 indicates the direction in which the driver visually recognizes.

As described above, according to the present embodiment, the vehicle speed, which is the visual information necessary for the operation of the vehicle, is displayed three-dimensionally by the hologram plate 23. Can be improved.

Further, a plurality of three-dimensional images S required for segmentally displaying the vehicle speed by numerals are displayed on the hologram plate 2.
3 are individually recorded in a plurality of recording areas D, and the reproduction illumination light from the light source unit 27 incident on each of the recording areas D is controlled by the liquid crystal panel 25, whereby the reproduction required for displaying the vehicle speed is performed. Since the three-dimensional image S to be selected is selected, it is not necessary to provide a plurality of hologram plates, and it is possible to reduce the size and space and to reduce the cost. The display contents can be changed in accordance with the ever-changing vehicle speed, and there is an advantage that a mechanical configuration is not required and the configuration is simple.

Further, the hologram plate 23 and the liquid crystal panel 2
Since the light source unit 27 and the light source unit 27 are integrated, the number of components can be reduced, and the display device 21 can be reduced in size, space, and cost.

In this embodiment, the liquid crystal panel 25 is constructed by arranging polarizing plates 25a and 25b on both sides of a liquid crystal element 25a using a polarization direction changing type liquid crystal layer as a liquid crystal layer. The liquid crystal panel 25 may be configured by using a polymer-dispersed liquid crystal layer as the liquid crystal layer without using the polarizing plates 25a and 25b.

The polymer-dispersed liquid crystal layer is composed of a composite film (composite) of a predetermined polymer and liquid crystal.
P (nematic curvilineear ali
gnd phase) type or PN (polymer n)
In the absence of a voltage, the liquid crystal in the liquid crystal layer is oriented in a random direction, causing a difference in the refractive index between the polymer and the liquid crystal, and the incident light is scattered and transmitted. The liquid crystal is arranged in the direction of the electric field when a voltage is applied, and the refractive indices of the polymer and the liquid crystal match, and the incident light is scattered. In this case, the light is transmitted without being transmitted, so that it is in a transparent state.

The liquid crystal element 25a (liquid crystal panel 25) using such a polymer-dispersed liquid crystal layer is connected to the hologram plate 2
3, the polarizing plates 25b and 25c can be removed by controlling the transmission and blocking of the reproduction illumination light from the light source unit 27 incident on each recording area D, and the reproduction illumination light passes through the liquid crystal element 25a. In this case, the loss of light amount can be significantly reduced, and the brightness of the three-dimensional image S can be improved.

In the present embodiment, the hologram plate 23
The numbers are segment-displayed by a plurality of three-dimensional images S reproduced by the method described above.
As shown in the above, a predetermined numerical value such as a vehicle speed may be segment-displayed in a graph.

3. Third Embodiment FIG. 12 is a diagram showing an overall configuration of a display device according to a third embodiment corresponding to the third to sixth and seventeenth inventions. The display device 41 includes a hologram plate 23 that is the same as the hologram plate 23 according to the above-described second embodiment, and a liquid crystal panel 45 that is disposed on the back side of the hologram plate 23 so as to cover the entire surface of the hologram plate 23. And a light source unit 47 disposed on the back side of the liquid crystal panel 45, and a control unit (image selecting means) 49 for controlling the liquid crystal panel 45 and the light source unit 47. The display device 41 configured in this manner is installed on an instrument panel or the like in front of the driver's seat of the vehicle, and three-dimensionally displays predetermined visual information necessary for the operation of the vehicle, here, the vehicle speed by the hologram plate 23. It is supposed to. Here, the hologram plate 23, the liquid crystal panel 45, and the light source unit 47 are integrated.

In the liquid crystal panel 45, a plurality of transparent pixel electrodes are formed on the inner surface of one of the two transparent substrates bonded to each other with the liquid crystal layer interposed therebetween. Predetermined polarizing plates 45b and 45c are provided on both sides of a TFT type liquid crystal element 45a on which a transparent common electrode is formed.

The liquid crystal panel 45 changes the voltage applied to the liquid crystal layer between each pixel electrode and the common electrode of the liquid crystal element 45 a based on the signal input from the control unit 49, The light transmittance of each pixel portion is changed by changing the torsional angle of the polarization direction generated while the light passes through each pixel portion formed by each pixel electrode.

The outer shape of the liquid crystal panel 45 is
The hologram plate 23 is set to be larger than 3.
For example, it is arranged at a central portion 45 a on the front side of the liquid crystal panel 45. On the other hand, the light source unit 47 irradiates the entire surface of the liquid crystal panel 45 with predetermined light (also used as reproduction reference light for hologram reproduction).

This liquid crystal panel 45 is
By changing the transmittance of light of each pixel portion facing each recording region D, the reproduction illumination light from the light source unit 47 that transmits through the liquid crystal panel 45 and enters each recording region D of the hologram plate 23 is transmitted. Or a function of shutting off and selecting a three-dimensional image S to be reproduced from a plurality of three-dimensional images S according to a vehicle speed to be displayed, and each pixel located in a peripheral portion 45 b not facing the hologram plate 23. By changing the light transmittance of the section, various visual information necessary for the operation of the vehicle as shown in FIG. 13 to be described later is displayed around the three-dimensional image S.

Various signals indicating the vehicle state such as the vehicle speed are externally input to the control unit 49. The control unit 49 controls on / off of the light source unit 47 and outputs the input signal. LCD panel 4 based on
5 is controlled to determine the three-dimensional image S to be reproduced recorded on the hologram plate 23 according to the vehicle speed, and the three-dimensional display of the vehicle speed is performed. Various types of visual information are displayed.

As described above, when the reproduction illumination light from the light source unit 47 enters the hologram plate 23 from the back side through the liquid crystal panel 45, a predetermined space 53 between the hologram plate 23 and the driver on the front side. 13, a three-dimensional image S indicating the vehicle speed is reproduced three-dimensionally in a predetermined combination as shown in FIG. 13, while a fuel gauge 51 and a water temperature gauge are provided around the three-dimensional image S. Various types of visual information such as 55, a turn signal indicator 57, a parking indicator 59, a seat belt indicator 61, and a battery indicator 63 are displayed on the liquid crystal panel 45. Here, in FIG. 12, an arrow 65 indicates the direction in which the driver visually recognizes.

As described above, according to the present embodiment, the vehicle speed, which is the visual information necessary for the operation of the vehicle, is three-dimensionally displayed by the hologram plate 23. Can be improved.

Further, a plurality of three-dimensional images S required for displaying the vehicle speed in segments by numerals are displayed on the hologram plate 2.
3 are individually recorded in a plurality of recording areas D, and the reproduction illumination light from the light source unit 27 incident on each of the recording areas D is controlled by the liquid crystal panel 45 so that the reproduction necessary for displaying the vehicle speed is performed. Since the three-dimensional image S to be selected is selected, there is no need to provide a plurality of hologram plates, and it is possible to reduce the size and space and to reduce the cost, and to respond to the ever-changing vehicle speed. The display contents of the three-dimensional image S to be reproduced can be changed, and there is an advantage that a mechanical configuration is not required and the configuration is simple.

Further, the liquid crystal panel 45 is
The outer shape larger than 3 is used. The hologram plate 23 is displayed three-dimensionally by a single liquid crystal panel 45, and various kinds of visual information such as the fuel gauge 51 are displayed in a peripheral portion 45b. Therefore, it is not necessary to separately provide a liquid crystal panel for liquid crystal display and a liquid crystal panel for hologram display, and it is possible to reduce the size, space, and cost.

The hologram plate 23 and the liquid crystal panel 45
And the light source unit 47 are integrated, so that the number of parts is reduced, the display device 41 is reduced in size, space is saved,
And cost can be reduced.

In this embodiment, the vehicle speed is segmentally displayed by a numeral. However, as shown in FIGS. 3 and 4, the vehicle speed may be segmentally displayed by a graph. Good.

In the second and third embodiments, the vehicle speed is displayed three-dimensionally. However, other warning displays such as a shift position of an automatic transmission, a clock, an odometer, a battery indicator, etc. The visual recognition information may be displayed three-dimensionally.

4. Fourth Embodiment FIG. 14 is a diagram showing an overall configuration of a display device according to a fourth embodiment corresponding to the eighth and seventeenth inventions.
5 is a front view of a hologram plate provided in the display device, and FIG.
It is a figure which shows the structure of a two-dimensional image in plane.

The display device 71 includes a hologram plate 73
Hologram plate 73 on the back side of hologram plate 73
, A liquid crystal element 75 integrated with the hologram plate 73, light source units 77a, 77b disposed on the back side of the liquid crystal element 75, a liquid crystal panel 75 and a light source unit 77a. , 77b, and a control unit (image selection means) 79. The display device 71 configured as described above is installed on an instrument panel or the like in front of the driver's seat of the vehicle, and displays various types of information such as a predetermined vehicle speed required for vehicle operation and a shift position of the automatic transmission. The visual recognition information, here the shift position, is three-dimensionally displayed by the hologram plate 73.

The shift positions are indicated by “P”, “R”, “N”, “D”, “3”, “2” representing each shift position.
Corresponding to a plurality of three-dimensional images F1 to F6 shown in FIG.
(Hereinafter, simply referred to as “F” when collectively referred to) is performed by three-dimensionally displaying one of the holograms on the hologram plate 73.
3, a plurality of three-dimensional images F are stored in corresponding predetermined recording areas G1 to G6 of the hologram plate 73 (hereinafter, simply referred to as “G”) as schematically shown in FIG. Are recorded as interference fringes for hologram display in a state independent of each other, and when each recording area G is irradiated with reproduction illumination light, it is recorded in the recording area G irradiated with reproduction illumination light. Only the three-dimensional image F is reproduced. Further, each recording area G of the hologram plate 73
Are formed adjacent to each other in a straight line along one direction, here, the vertical direction.

The liquid crystal element 75 has a structure in which a liquid crystal layer is formed between two transparent substrates having transparent electrodes formed on opposing surfaces, and the liquid crystal element 75 responds to a change in a voltage value applied to the liquid crystal layer. Utilizing the property that the refractive index of the liquid crystal layer changes as the direction of the liquid crystal molecules changes, the light source units 77a, 77
The incident position of the reproduction illumination light radiated by 7b on the hologram plate 73 is changed in one direction, here, in the vertical direction.

Here, the liquid crystal element 75 has a normal TN,
Although it is assumed that an STN mode liquid crystal element is used, a liquid crystal element using the above-described polymer dispersed liquid crystal may be used. Also in this polymer dispersed liquid crystal layer, the refractive index is changed by changing the voltage applied between the transparent electrodes sandwiching the polymer dispersed liquid crystal layer.

The light source units 77a and 77b irradiate the hologram plate 73 with reproduction illumination light for reproducing the three-dimensional image F via the liquid crystal element 75, and the light source unit 77a operates in the recording areas G1 to G3. And the light source unit 77.
b irradiates reproduction illumination light to the recording areas G4 to G6. Further, the light source units 77a and 77
When the reproduction illumination light irradiated by b is incident on the hologram plate 73, it is recorded in the recording areas G1 to G3 and G4 to G6.
Of the liquid crystal element 75, and the traveling direction is effectively changed by the liquid crystal layer of the liquid crystal element 75. The liquid crystal element 75 is irradiated so as to be obliquely incident so that the liquid crystal element 75 can be changed.

The voltage applied between the transparent electrodes for controlling the refractive index of the liquid crystal layer of the liquid crystal element 75 is controlled by the light source unit 77.
17A and 17B, the traveling direction of the reproduced illumination light is changed by refraction in the liquid crystal layer of the liquid crystal element 75 as shown in FIGS. 17 and 18, and then the three-dimensional light corresponding to the shift value to be displayed is displayed. The control unit 79 is controlled so that the image F is incident on the recording area G of the hologram plate 73 on which the image F is recorded.

A signal indicating the shift position is externally input to the control unit 79. The control unit 79 controls the light source units 77a and 77b to be turned on and off in accordance with the shift position to be displayed, and controls the transparent state of the liquid crystal element 75. By controlling the voltage applied between the electrodes and controlling the refractive index of the liquid crystal layer, a three-dimensional image F to be reproduced corresponding to the shift position is selected from a plurality of three-dimensional images F recorded on the hologram plate 73. Select

The hologram plate 73 is a transmission-type hologram plate.
When the reproduction illumination light from 7b is irradiated from the back side,
In a predetermined space 81 between the hologram plate 73 and the driver on the surface side, a three-dimensional image F representing the shift position is provided.
As shown in FIGS. 19 and 20, three-dimensional reproduction is performed. Here, in FIG. 14, an arrow 83 indicates the direction in which the driver visually recognizes.

As described above, according to the present embodiment, the shift position of the automatic transmission, which is the visual information necessary for the operation of the vehicle, is three-dimensionally displayed by the hologram plate 73. Visibility can be improved.

Further, a plurality of three-dimensional images F necessary for displaying the shift position are individually recorded in a plurality of recording areas G of the hologram plate 73, and the light source unit 77a which enters each of the recording areas G , 77b are controlled by the liquid crystal element 75, so that the three-dimensional image F to be reproduced is selected. Therefore, it is not necessary to provide a plurality of hologram plates, and the size and space can be reduced. And the cost can be reduced, and the display content of the reproduced three-dimensional image F can be changed according to the change of the shift position. This eliminates the need for a mechanical structure and has an advantage that the structure is simple. There is.

Further, the hologram plate 73 and the liquid crystal panel 7
5 is integrated, the number of components is reduced, and the display device 71 can be reduced in size, space, and cost.

In this embodiment, the shift position of the automatic transmission is displayed three-dimensionally. However, other visual information such as various warning displays such as a vehicle speed, a clock, an odometer, a battery indicator, and the like are displayed. You may make it display dimensionally.

5. Fifth Embodiment FIG. 21 is a diagram showing an overall configuration of a display device according to a fifth embodiment corresponding to the ninth and seventeenth inventions.
2 is a front view of a hologram plate provided in the display device, and FIG.
It is a figure which shows the structure of a two-dimensional image in plane.

The display device 91 includes a hologram plate 93 and a light source unit 95. The light source unit 95 includes a plurality of lighting devices (here, six lighting devices) H1 to H6 (hereinafter, collectively referred to as “H”), and a lighting control unit (image) (Selecting means) 97. The display device 91 configured in this way is installed on an instrument panel or the like in front of the driver's seat of the vehicle, and uses a hologram plate 93 to determine predetermined visual information necessary for vehicle operation, here, the shift position of the automatic transmission. It is designed to be displayed three-dimensionally.

The shift position is indicated by “P”, “R”, “N”, “D”, “3”, “2” representing each shift position.
, A plurality of three-dimensional images I1 to I6 shown in FIG.
(Hereinafter, simply referred to as “I” when collectively referred to), and is performed by three-dimensionally displaying one of them on the hologram plate 93.
As shown in FIG. 22, a plurality of three-dimensional images I are reproduced from the reference light at the time of recording so that a plurality of three-dimensional images I are reproduced independently by reproduction illumination light having different wavelengths. Multiplex recording is performed as interference fringes for hologram display with different wavelengths. Here, a plurality of three-dimensional images I
Is preferably multiplex-recorded in a state of being superimposed on the same position on the hologram plate 93 in order to save space.

In this case, the three-dimensional image I for displaying the shift position is multiplex-recorded on the hologram plate 93.
In the same way, "0" to "180" for speed display
Alternatively, a three-dimensional image indicating an integer value up to a predetermined value such as the above may be recorded on the hologram plate 93, and the vehicle speed may be displayed three-dimensionally.

Each illuminating device H of the light source unit 95 is irradiated with light containing at least all the wavelength components necessary for reproducing all the three-dimensional images I recorded on the hologram plate 93, for example, white light. A light source 99 and an optical filter 101 that transmits only light of a wavelength component for reproducing one of the three-dimensional images I recorded on the hologram plate 93 out of the light emitted from each light source 99 are provided. Have been. Each lighting device H and each 3 recorded on the hologram plate 93
The one-dimensional image I has a one-to-one correspondence, and each illuminating device H irradiates the hologram plate 93 with reproduction illumination light of a wavelength component for reproducing the corresponding three-dimensional image I. I have. Thus, by turning on one of the plurality of illumination devices H, one of the corresponding three-dimensional images I among the plurality of three-dimensional images I recorded on the hologram plate 93 is reproduced. You can do it.

In this embodiment, each lighting device H is provided with the optical filter 101 to extract light of a predetermined wavelength component. However, as the light source 99 of each lighting device H, a single light source such as an LED or a laser is used. Light emitting means for irradiating light of a wavelength may be used. In this case, the optical filter 101 is unnecessary.

A signal indicating the shift position is externally input to the lighting control unit 97, and a plurality of lighting devices H are turned on so that one lighting device H corresponding to the shift position to be displayed is turned on. Of the three-dimensional images I recorded on the hologram plate 93, one of the three-dimensional images I to be reproduced corresponding to the shift position is selected.

The hologram plate 93 is a transmission type hologram plate. When the reproduction illumination light is irradiated from the back side by the illumination device H in this way, the hologram plate 93 on the front side and the driver can communicate with each other. Predetermined space 103 between
During this, a three-dimensional image I indicating the shift position is reproduced three-dimensionally as shown in FIGS. Here, in FIG. 21, the arrow 105 indicates the viewing direction of the driver.

As described above, according to the present embodiment, the hologram plate 93 allows the hologram plate 93 to determine the transmission position of the automatic transmission, which is the visual information necessary for the operation of the vehicle.
Since the information is displayed in a three-dimensional manner, the visibility of the viewing information can be improved.

Further, a plurality of three-dimensional images I necessary for displaying the shift position are reproduced so as to be independently reproduced by reproduction illumination lights of different wavelength components emitted from the respective illumination devices H. Are multiplex-recorded on the hologram plate 93, so there is no need to provide a plurality of hologram plates,
It is possible to reduce the size and space and to reduce the cost, and it is possible to change the display contents of the reproduced three-dimensional image I according to the change of the shift position. There is an advantage that is.

In this embodiment, the shift position of the automatic transmission is displayed three-dimensionally. However, other visual information such as various warning displays such as a vehicle speed, a clock, an odometer, a battery indicator, and the like may be displayed. You may make it display dimensionally.

6. Sixth Embodiment FIG. 26 is a diagram showing an overall configuration of a display device according to a sixth embodiment corresponding to the tenth and seventeenth inventions. The hologram 93 used in the display device 111 according to the present embodiment is the same as the hologram plate 93 according to the above-described embodiment, and the recorded contents and the reproduced contents of the hologram plate 93 are also the same. This embodiment will be described with reference to FIG.

The display device 111 includes a hologram plate 93.
And a hologram plate 93 on the back side of the hologram plate 93.
Wavelength selection element (wavelength selection means) 115 disposed so as to cover the entire surface of light source unit 117 disposed on the back side of wavelength selection element 115, and wavelength selection element 11
5 and a control unit (image selecting means) 119 for controlling the light source unit 117. The display device 111 configured as described above is installed on an instrument panel or the like in front of the driver's seat of the vehicle, and uses the hologram plate 93 to determine predetermined visual information necessary for vehicle operation, here, the shift position of the automatic transmission. It is designed to be displayed three-dimensionally. Here, the hologram plate 9
3, the wavelength selection element 115, and the light source unit 117 are integrated.

As shown in FIG. 27, both sides of a liquid crystal element 123 having a liquid crystal layer 121 formed between two transparent substrates 137 and 139 having transparent electrodes formed on opposing surfaces, as shown in FIG. A high-reflection / transmission surface (a surface with a light transmittance of about 1%) 125, 127 is formed on the surface, and the two high-reflection / transmission surfaces 125, 127 are used as a Fabry-Perot pair. Only the light of the wavelength component is transmitted.

As shown in FIG. 27, the light source unit 117 includes, as shown in FIG. 27, light containing at least all the wavelength components necessary for reproducing all the three-dimensional images I recorded on the hologram plate 93, for example, white light. And a reflector 131 disposed opposite the wavelength selection element 115 with the light source 129 interposed therebetween, and the light emitted from the light source 129 is reflected by the wavelength conversion element 115 by the reflector 131.
While being reflected in the direction, the light is incident on the wavelength conversion element 115.

Light source 129 incident on wavelength selection element 115
27, while being reflected between the two high-reflection / transmission surfaces 125 and 127, passes through the high-reflection / transmission surface 125 on the front side and exits to the hologram plate 93 side, as shown in FIG. However, among the light components emitted from the wavelength conversion element 115 in this way, only the light of the wavelength component whose integral multiple of the wavelength is equal to the optical path length between the high reflection / transmission surfaces 125 and 127 strengthens each other. The light of the wavelength components is weakened, and substantially only the light of the specific wavelength component is emitted from the wavelength conversion element 115.

The wavelength of light extracted by the wavelength conversion element 115 is changed by the liquid crystal layer 121 of the liquid crystal element 123.
Is performed using the property that the refractive index of the liquid crystal layer 121 changes as the direction of the liquid crystal molecules changes in accordance with the change in the voltage value applied to the liquid crystal layer 121. When it changes, the high reflection / transmission surface 125,
The optical path length between the light source 127 and the light source 129 emitted from the wavelength changing element 115 changes the wavelength component of the light.

That is, by controlling the refractive index of the liquid crystal layer 121 and making the wavelength of the light emitted from the wavelength selection element 115 coincide with the wavelength of the reproduction illumination light of each three-dimensional image I recorded on the hologram plate 93. Only the predetermined three-dimensional image I corresponding to the shift position to be displayed can be selected and reproduced.

A signal indicating the shift position is externally input to the control unit 119.
Controls the applied voltage applied between the transparent electrodes of the liquid crystal element 123 of the wavelength selection element 115 to control the refractive index of the liquid crystal layer 121, thereby obtaining a plurality of three-dimensional images I recorded on the hologram plate 93. From among these, one three-dimensional image I to be reproduced corresponding to the shift position is selected.

In this way, the reproduction illumination light, which is the light of the predetermined wavelength component, from the light source unit 117 is emitted from the hologram plate 9.
When illuminated from the back side of the 3, a three-dimensional image I indicating the shift position is placed in a predetermined space 133 between the hologram plate 93 and the driver, as shown in FIGS. 24 and 25. Reproduced dimensionally. Here, in FIG.
Reference numeral 35 denotes a driver's viewing direction.

As described above, according to the present embodiment, the hologram plate 93 allows the hologram plate 93 to determine the transmission position of the automatic transmission, which is the visual information necessary for operating the vehicle.
Since the information is displayed in a three-dimensional manner, the visibility of the viewing information can be improved.

A plurality of three-dimensional images I necessary for displaying the shift position are independent of each other by the light of the wavelength component extracted by the wavelength selection element 115 from the light component emitted from the light source unit 117. Multiplexed recording on a single hologram plate 93 so that
Since it is not necessary to provide a plurality of hologram plates, it is possible to reduce the size and space and to reduce the cost, and it is possible to change the display contents of the reproduced three-dimensional image I with the change of the shift position. Without the need for strategic configuration,
There is an advantage that the configuration is simple.

Further, since the hologram plate 93, the wavelength selection element 115, and the light source unit 117 are integrated, the number of components can be reduced, and the display device 111 can be reduced in size, space, and cost. it can.

In the present embodiment, the shift position of the automatic transmission is displayed three-dimensionally. However, other visual information such as a vehicle speed, a clock, an odometer, a battery indicator, and other various warning displays may be displayed. You may make it display dimensionally.

In the present embodiment, the wavelength selection element 11
Although it is assumed that a normal TN or STN type liquid crystal element is used as the liquid crystal element 123 of No. 5, a liquid crystal element using the above-described polymer dispersed liquid crystal layer may be used. In this case, the refractive index may be changed by changing the voltage applied to the composite film composed of the polymer and the polymer.

7. Seventh Embodiment FIG. 28 is a diagram showing an overall configuration of a display device according to a seventh embodiment corresponding to the eleventh and seventeenth inventions, and FIG. 29 is a front view of a hologram plate provided in the display device. FIG. 30 is a plan view showing a configuration of a three-dimensional image reproduced by the hologram plate.

The display device 141 includes the hologram plate 14
3, a polarization direction conversion element (polarization direction conversion means) 145 disposed on the back side of the hologram plate 143 so as to cover the entire surface of the hologram plate 143, and disposed on the back side of the polarization direction conversion element 145. Light source unit 147
And the polarization direction conversion element 145 and the light source unit 147
And a control unit (image selecting means) 149 for controlling the image processing. The display device 141 thus configured
Is installed on an instrument panel or the like in front of the driver's seat of the vehicle, and is configured to three-dimensionally display predetermined visual information necessary for the operation of the vehicle, here, the shift position of the automatic transmission, using the hologram plate 143. . Here, the hologram plate 143, the polarization direction conversion element 145, and the light source unit 147 are integrated.

The shift positions are indicated by “P”, “R”, “N”, “D”, “3”, “2” representing each shift position.
A plurality of three-dimensional images J1 to J6 shown in FIG.
(Hereinafter, simply referred to as “J”) is displayed by three-dimensional display on the hologram plate 143. As schematically shown by virtual lines,
Multiple recording as interference fringes for hologram display by making the polarization directions of reference light different from each other so that a plurality of three-dimensional images J are reproduced independently from each other by reproduction illumination light having different polarization directions. Have been. Here, the plurality of three-dimensional images J are hologram plates 1 to save space.
It is preferable that the multiplexed recording is performed in a state where the multiplexed recording is superimposed on the same position on 43.

In this case, the three-dimensional image J for displaying the shift position is multiplex-recorded on the hologram plate 143. However, in the same manner, the speed display from "0" to "18" is performed.
A three-dimensional image indicating an integer value up to a predetermined value such as "0" may be recorded on the hologram plate 143, and the vehicle speed may be displayed three-dimensionally.

As shown in FIGS. 31 and 32, the polarization direction changing element 145 has a liquid crystal in which a liquid crystal layer 155 is formed between two transparent substrates 151 and 153 having transparent electrodes formed on the surfaces facing each other. A predetermined polarizing plate 159 is provided on the back surface (light source unit 147 side) surface of the element 157, and by changing the voltage applied to the liquid crystal layer 155 based on a control signal given from the control unit 149, The polarization direction of the light emitted to the hologram plate 143 is changed.

More specifically, of the light components emitted from the light source unit 147, only the light component in a predetermined polarization direction is incident on the liquid crystal element 157 via the polarizing plate 159. By changing the applied voltage to the liquid crystal layer 155, the polarization of the light emitted to the hologram plate 143 side is changed by changing the voltage applied to the liquid crystal layer 155. The direction is changed.

That is, the value of the voltage applied between the transparent electrodes of the liquid crystal element 157 is controlled, and the polarization direction of the light emitted from the polarization direction conversion element 145 is changed to the reproduction illumination of each three-dimensional image J recorded on the hologram plate 143. By matching the polarization direction of the light, only a predetermined three-dimensional image J corresponding to the shift position to be displayed can be selected and reproduced.

A signal indicating the shift position is externally input to the control unit 149.
Is to reproduce from a plurality of three-dimensional images J recorded on the hologram plate 143 corresponding to the shift position by controlling an applied voltage between the transparent electrodes of the liquid crystal element 157 of the polarization direction conversion element 145. One three-dimensional image J is selected.

The hologram plate 143 is a transmission type hologram plate. When light from the light source unit 147 is irradiated from the back side through the polarization direction conversion element 145 in this manner, the hologram plate on the front side is formed. Board 14
In a predetermined space 161 between the driver 3 and the driver, a three-dimensional image J indicating the shift position is reproduced three-dimensionally as shown in FIGS. Here, in FIG.
Arrow 163 indicates the viewing direction of the driver.

As described above, according to the present embodiment, the hologram plate 143 three-dimensionally displays the transmission position of the automatic transmission, which is the visual information necessary for the operation of the vehicle. Visibility can be improved.

A plurality of three-dimensional images J necessary for displaying the shift position are reproduced independently of each other by reproduction illumination light from the light source unit 147 whose polarization direction is controlled by the polarization direction conversion element 145. As described above, since multiplexed recording is performed on a single hologram plate 143, there is no need to provide a plurality of hologram plates.
The display contents of the two-dimensional image J can be changed according to the change of the shift position, and there is an advantage that a mechanical configuration is not required and the configuration is simple.

Further, since the hologram plate 143, the polarization direction conversion element 145, and the light source unit 147 are integrated, the number of parts is reduced, and the display device 141 is reduced in size, space, and cost. Can be.

In the present embodiment, the shift position of the automatic transmission is displayed three-dimensionally. However, other visual information such as various warning displays such as a vehicle speed, a clock, an odometer, a battery indicator, and the like are displayed. You may make it display dimensionally.

8. Eighth Embodiment FIG. 35 is a diagram showing an overall configuration of a display device according to an eighth embodiment corresponding to the twelfth and seventeenth inventions, and FIG. 36 is a front view of a hologram plate provided in the display device. FIG. 37 is a plan view showing a configuration of a three-dimensional image reproduced by the hologram plate.

The display device 201 includes the hologram plate 20
3, a liquid crystal element 205, a light source unit 207, and a control unit (image selection means) 209 for controlling the liquid crystal element 205 and the light source unit 207.
The display device 201 configured in this manner is installed on an instrument panel or the like in front of the driver's seat of the vehicle, and displays predetermined visual information necessary for vehicle operation, here, the shift position of the automatic transmission, on the hologram plate 20.
3 indicates three-dimensional display.

The shift position is indicated by “P”, “R”, “N”, “D”, “3”, “2” representing each shift position.
Of the three-dimensional images T1 to T6 shown in FIG.
36 (hereinafter, simply referred to as “T” when collectively referred to), the hologram plate 203 performs three-dimensional display. As schematically shown by virtual lines,
Interference for hologram display by making the irradiation directions of the reference light different from each other so that a plurality of three-dimensional images TI are reproduced independently of each other by reproduction illumination light having different incident angles (incident directions). Multiple recording is performed as stripes.
Here, it is preferable that the plurality of three-dimensional images T are multiplex-recorded in a state of being superimposed on the same position on the hologram plate 203 in order to save space.

In this case, the three-dimensional image T for displaying the shift position is multiplex-recorded on the hologram plate 203. However, in the same manner, the speed display from "0" to "18" is performed.
A three-dimensional image indicating an integer value up to a predetermined value such as “0” may be recorded on the hologram plate 203 to display the vehicle speed three-dimensionally.

As shown in FIG. 38, the liquid crystal element 205 has a structure in which a liquid crystal layer 215 is sandwiched between two transparent substrates 211 and 213 having transparent electrodes 211a and 213a formed on opposing surfaces. And the light source unit 207
The transparent substrate 21 on the incident side of the reproduction illumination light 207a irradiated by
1 and the transparent electrodes 211a have different refractive indices n1 and n2, and the transparent substrates 213 and 213a on the emission side of the reproduction illumination light 207a have different refractive indices n3 and n4. Further, the hologram plate 203 is adhered and fixed to the surface of the transparent substrate 213 on the emission side by a transparent adhesive having the same refractive index as the transparent substrate 213 in a close contact state.

The refractive index n of the liquid crystal layer 205 changes as the direction of the liquid crystal molecules changes in accordance with the change in the applied voltage value.
Utilizing the property that the refractive index n of the liquid crystal layer 205 changes, the angle of incidence θ of the reproduction illumination light 207a emitted from the light source unit 207 to the hologram plate 203 is changed, so that Of the three-dimensional image T to be reproduced is changed.

The light source unit 207 irradiates the reproduction illumination light 207a so that the reproduction illumination light 207a, which is the irradiation light, is obliquely incident on the liquid crystal element 205 at a predetermined angle. As shown in FIG. 38, the reproduction illumination light 207a emitted from the light source unit 207 receives one (incident side) of the transparent substrate 211 and the transparent electrode 211a.
, Through the liquid crystal layer 215, the other (outgoing side) transparent electrode 213 a and the transparent substrate 213 to enter the hologram plate 203. In the present embodiment, the refractive indices n1 and n2 of the transparent substrate 211 and the transparent electrode 211a on the incident side of the liquid crystal element 205 are set.
Since the refractive indexes n3 and n4 of the transparent substrate 213 and the transparent electrode 213a on the emission side are different from each other, when the refractive index n of the liquid crystal layer 215 is changed, the hologram plate 23 of the reproduction illumination light 207a is accordingly changed. Is changed.

The plurality of three-dimensional images T recorded on the hologram plate 203 are recorded so as to be reproduced independently of each other by the reproduction illumination light 207a incident at different incident angles θ, and the liquid crystal of the liquid crystal element 205 By controlling the refractive index n of the layer 215 and causing the reproduction illumination light 207a to enter the hologram plate 203 at a predetermined incident angle θ, a three-dimensional image T corresponding to the incident angle θ is selected from a plurality of three-dimensional images T. It is to be played.

A signal indicating the shift position is externally input to the control unit 209.
09 are both transparent electrodes 211a and 213 of the liquid crystal element 205.
By controlling the refractive index n of the liquid crystal layer 215 by changing the applied voltage between the hologram plate 203 and the incident angle θ of the reproduction illumination light 207a to the hologram plate 203, a plurality of three-dimensional images recorded on the hologram plate 203 are controlled. One three-dimensional image T to be reproduced corresponding to the shift position is selected from the images T.

The hologram plate 203 is a transmission type hologram plate. When the reproduction illumination light 207a from the light source unit 207 is irradiated from the back side in this way, the hologram plate 203 on the front side and the driver Indicating the shift position in a predetermined space 217 between
As shown in FIGS. 39 and 40, the three-dimensional image T
Reproduced dimensionally. Here, in FIG. 35, the arrow 219 indicates the viewing direction of the driver.

As described above, according to this embodiment, the hologram plate 203 is used to three-dimensionally display the transformer position of the automatic transmission, which is the visual information necessary for the operation of the vehicle. Visibility can be improved.

Further, a single three-dimensional image T necessary for displaying the shift position is reproduced independently by reproduction illumination light 207a from the light source unit 207 having different incident angles θ from each other. The multiplexed recording is performed on the hologram plate 203, and the liquid crystal layer 2 of the liquid crystal element 205 is
Since the three-dimensional image T to be reproduced can be changed by changing the refractive index n of 15, it is not necessary to provide a plurality of hologram plates, and it is possible to reduce the size and space and to reduce the cost. The display contents of the reproduced three-dimensional image T can be changed according to the change of the shift position, and there is an advantage that a mechanical configuration is not required and the configuration is simple.

9. Ninth Embodiment FIG. 41 is a diagram showing an overall configuration of a display device according to a ninth embodiment corresponding to the thirteenth and seventeenth inventions. The display device 221 includes a hologram reproducing element (hologram reproducing means) 223, a light source unit 225, and a control unit (image selecting means) 227 for controlling the hologram reproducing element 223 and the light source unit 225. . The display device 221 configured in this manner is installed on an instrument panel or the like in front of the driver's seat of the vehicle, and displays predetermined visual information necessary for vehicle operation, here, the shift position of the automatic transmission, for example, as the hologram reproducing element 223. 3D display.

The hologram reproducing element 223 is provided with a hologram plate 203 similar to the hologram plate 203 according to the above-described eighth embodiment, and the shift position is three-dimensional as in the case of the above-described ninth embodiment. It is displayed. Here, the detailed description of the hologram plate 203 is omitted.

In the hologram reproducing element 223, as shown in FIG. 42, one of two transparent substrates opposed to each other with a liquid crystal layer 227 interposed therebetween (emission of reproduction illumination light 225a emitted from the light source unit 225). The hologram plate 203 is used for the transparent substrate (side), and the normal transparent substrate 229 is provided for the transparent substrate on the other side (incident side of the reproduction illumination light 225a). The transparent electrode 231 is provided on the inner surface side of the transparent substrate 229, that is, the surface that comes into contact with the liquid crystal layer 227, and the transparent electrode 233 is provided on the outer surface side of the hologram plate 203, that is, the surface that is not in contact with the liquid crystal layer 227.
The liquid crystal layer 227 is provided by controlling an applied voltage applied between the transparent electrodes 231 and 233.
Of the liquid crystal molecules can be controlled, and the refractive index n of the liquid crystal layer 227 can be changed. In addition,
The hologram plate 203 is formed of a light-transmitting insulating member such as a resin.

The light source unit 225 controls the reproduction illumination light 225 so that the reproduction illumination light 225a as the irradiation light is obliquely incident on the hologram reproduction element 223 at a predetermined angle.
a. As shown in FIG. 42, the reproduction illumination light 225a emitted from the light source unit 225 is transmitted to the transparent substrate 229 and the transparent electrode 231 on the incident side.
And enters the hologram plate 203 through the liquid crystal layer 227 at a predetermined incident angle θ.

Since a plurality of three-dimensional images T are multiplex-recorded on the hologram plate 203 so as to be reproduced independently of each other by the reproduction illumination light 225a from the light source unit 225 having different incident angles θ as described above. , Liquid crystal layer 22
7, the incident angle θ of the reproduction illumination light 225a to the hologram plate 203 by changing the refractive index n of
The content of the three-dimensional image T reproduced from the plurality of three-dimensional images T recorded on the hologram plate 203 can be changed.

A signal indicating the shift position is externally input to the control unit 227.
27 is the two transparent electrodes 23 of the hologram reproducing element 223
The refractive index n of the liquid crystal layer 227 is controlled by changing the applied voltage between the hologram plate 2 and the hologram plate 2 of the reproduction illumination light 225a.
By controlling the incident angle θ to the hologram plate 203, one three-dimensional image T to be reproduced corresponding to the shift position is selected from the plurality of three-dimensional images T recorded on the hologram plate 203.

The hologram plate 203 is a transmission type hologram plate. When the reproduction illumination light 225a from the light source unit 225 is irradiated from the back side in this way, the reproduction light is transmitted to the front side of the hologram plate 203. A three-dimensional image T indicating the shift position is transmitted through the transparent electrode 233 on the (outer surface side) in the driver direction, and in a predetermined space 235 between the hologram plate 203 and the driver on the front surface side.
As shown in FIG. 39 and FIG. 40 described above, three-dimensional reproduction is performed. Here, in FIG. 41, the arrow 237 indicates the viewing direction of the driver.

As described above, according to this embodiment, the hologram reproducing element 223 determines the position of the automatic transmission, which is the visual information necessary for the operation of the vehicle.
Since the three-dimensional display is performed by the hologram plate 203 provided in the camera, the visibility of the visible information can be improved.

Further, a single three-dimensional image T required for displaying the shift position is reproduced independently by reproduction illumination light 255a from the light source unit 255 having different incident angles θ from each other. While being multiplex-recorded on the hologram plate 203, the hologram reproducing element 223
Since the three-dimensional image T to be reproduced can be changed by changing the refractive index n of the liquid crystal layer 227, there is no need to provide a plurality of hologram plates, and it is possible to reduce the size, space, and cost. In addition to this, there is an advantage that the display content of the reproduced three-dimensional image T can be changed according to the change of the shift position, so that a mechanical configuration is not required and the configuration is simple.

In the eighth and ninth embodiments, the shift position of the automatic transmission is three-dimensionally displayed. However, various warning displays such as a vehicle speed, a clock, an odometer, a battery indicator, and the like are provided. Other visual recognition information may be displayed three-dimensionally.

In the eighth and ninth embodiments, the liquid crystal element 205 and the hologram reproducing element 223 are used.
Although it is assumed that a normal TN or STN mode is adopted, the above-described polymer dispersed liquid crystal mode may be adopted. In this case, the refractive index may be changed by changing the voltage applied to the composite film composed of the polymer and the polymer.

10. Tenth Embodiment FIG. 43 is a diagram showing an overall configuration of a display device according to a tenth embodiment corresponding to the fourteenth and seventeenth inventions.
This display device includes the display devices 1, 21, 41, 71, 91, 111, and 14 according to the above-described first to ninth embodiments.
1, 201 and 221 are shown as modified examples. Corresponding portions are denoted by the same reference characters and description thereof is omitted. In FIG. 35, the light source units 5, 27, 4
7, 77a, 77b, 95, 117, 147, 207,
225, liquid crystal panels 25 and 45, liquid crystal elements 75 and 22
3, the wavelength selection element 115, the polarization direction conversion element 145, the portion of the hologram reproduction element 223 other than the hologram plate 203, and the control units 29, 49, 79, 119, 149,
209 and 227 are omitted for convenience.

In the display device according to the present embodiment, three-dimensional images S, B, F, and F are formed by hologram plates 3, 23, 73, 93, 143, and 203 (hereinafter, simply referred to as hologram plates).
Spaces 9, 31, 53, 81, 103, 133, 161, in which I, J, T (hereinafter simply referred to as three-dimensional images) are reproduced.
A translucent screen 171 is provided in 219 and 235 so as to face the hologram plate, and a three-dimensional image reproduced by the hologram plate is projected on the screen 171 and a predetermined space is provided between the screen 171 and the driver. A lens 173 is provided, and the projected image of the three-dimensional image projected on the screen 171 is enlarged by the lens 173 so as to be visually recognized by the driver.

The screen 171 on which a three-dimensional image is projected
Is a translucent material having a predetermined color such as milky white (for example, a frosted glass shape). The screen 171 has a two-dimensional image which is a three-dimensional image reproduced three-dimensionally. The three-dimensional image is projected on the surface (back surface) facing the hologram plate, and the driver visually recognizes the three-dimensional image projected on the back surface through the lens 173.

As described above, according to the present embodiment, in addition to the effects of the above-described embodiments, the size of the three-dimensional image recorded on the hologram plate by the lens 173 projected on the screen 171 is increased. Since the three-dimensional image is enlarged by displaying the image at a size K2 larger than the size K1, the size K of the three-dimensional image when recorded on the hologram plate is increased.
1 can be reduced, and as a result, the size of the hologram plate and the entire display device can be reduced.

The reproduced three-dimensional image is displayed on the screen 1.
Since the image is projected on the projection 71, a clear projected image can be obtained, and the visibility of the displayed content can be improved.

When a clear three-dimensional image can be reproduced without using the screen 171,
May not be provided.

11. Eleventh Embodiment FIG. 44 shows an eleventh embodiment corresponding to the fifteenth to seventeenth aspects.
FIG. 1 is a diagram illustrating an overall configuration of a display device according to an embodiment. The display device 251 includes a hologram plate 253, an EL display element (display element) 255 disposed on the back side of the hologram plate 253 so as to cover the entire surface of the hologram plate 253, and a light emitting state of the EL display element 255. And a control unit (control means) 227 for controlling the display state. The display device 251 thus configured
Is installed in an instrument panel or the like in front of the driver's seat of the vehicle, and displays predetermined visual information required for operation of the vehicle, here, vehicle speed, various warning information, and the like.

In this embodiment, as shown in FIG. 45, the three-dimensional image 2 reproduced by the hologram plate 253 is used.
Meter display images 269 and 27 representing the vehicle speed and the engine speed by combining images 61 and 263 with images 265 and 267 displayed by EL display element 255.
1 is configured. Here, the three-dimensional image 26
Numerals 1 and 263 are dial images formed in an arc shape, images 265 and 267 are pointer images rotated in the dial image, and images 265 and 267 as the dial images are replaced with dial images. Is displayed at a rotation position corresponding to the speed and the number of rotations in the three-dimensional images 261, 263, so that the speedometer display and the tachometer display are performed.

As shown in FIG. 46, the hologram plate 253 is provided with two recording areas 273 and 275, and each of the recording areas 273 and 275 has a three-dimensional image 26.
1 and 263 are recorded as interference fringes for hologram reproduction. Then, each of the recording areas 273,
When the predetermined reproduction illumination light is irradiated to the back side from the back side,
The three-dimensional images 261, 263 are shown in FIGS.
As shown in FIG. 7, reproduction is performed three-dimensionally in the space 277 on the front side.

The hologram plate 253 is formed of a translucent member, and at least the recording area 27 is formed.
In portions other than 3,275, the display content of the EL display element 255 can be visually recognized through the hologram plate 253.

As shown in FIG. 48, each recording area 273, 2 of the hologram plate 253 is provided on the EL display element 255.
Light-emitting regions 281 and 283 for irradiating reproduction illumination light for reproducing the three-dimensional images 261 and 263 are provided at a portion facing the light-emitting region 75, and the pointer image 26 is provided inside each of the light-emitting regions 281 and 283.
Pointer display portions 285, 287 for displaying 5,267
Are provided around the light emitting areas 281 and 283 and the pointer display sections 285 and 287, and an information display section 289 for displaying various kinds of visual recognition information such as predetermined warning information is provided. Here, a parking indicator 291, a seat belt indicator 293, and a battery indicator 295 are displayed on the information display unit 289.

As a method for displaying the pointer images 265 and 567 in the pointer display portions 285 and 287, the pointer images 265 and 567 are displayed.
A plurality of pointer-shaped segment portions are provided at each rotation position where 267 is to be displayed, and a method of causing any one of the plurality of segment portions to emit light, the inside of the pointer display portions 28 and 287, or the EL A plurality of pixel portions in a matrix are formed on the entire display surface of the display element 255 facing the hologram plate 253, and a predetermined pixel portion of the plurality of pixel portions emits light in a pointer-like manner, thereby providing a predetermined shape. There is a method of displaying the pointer images 265 and 267 at the rotation position.

Light emitting areas 281 and 282 of EL display element 255
83 is the three-dimensional image 26 recorded on the hologram plate 253
The illuminating light emitted from the light-emitting areas 281 and 283 is used to irradiate the hologram plate 253 with each of the recording areas 273 and 2.
When the light enters each of the lenses 75, three-dimensional images 261 and 263 for meter display are reproduced.

The light emitting area 28 of the EL display element 255
The control unit 257 controls the light emission state and the display state of the pointer display units 285, 287 and the information display unit 289 based on signals input from the outside.

In the display device 251 configured as described above, when the viewer views the display contents of the display device 251 from the viewing direction 297 shown in FIG. Image (Dial image) 27
3,275 and the pointer image 265,2 displayed inside it
67, a speedometer display image 269 and a tachometer display image 271 are displayed, and predetermined visual information such as a parking indicator 291 is displayed around the display image.

As described above, according to the present embodiment, the EL
When the display element 255 is used as a display device,
Since the light source is also used as a light source for reproducing the two-dimensional images 261 and 263, it is not necessary to provide a dedicated light source unit for reproduction illumination light, and the configuration of the display device 251 can be simplified and downsized. Can be planned.

Further, meter display images 269 and 271 for speedometer display and tachometer display are converted to three-dimensional image 26 which is a dial image reproduced by hologram plate 253.
1, 263, and the pointer images 265, 267 displayed by the EL display element 255, respectively, so that the dial and the pointer can be clearly visually recognized, and the analog meter display can be effectively performed. Can be done.

In this embodiment, EL is used as a display element.
Although the display element 255 is used, any display element that performs display using light may be used. For example, a liquid crystal display element may be used.

12. Twelfth Embodiment FIG. 49 is a diagram showing an overall configuration of a display device according to a twelfth embodiment corresponding to the eighteenth and nineteenth inventions.
This display device includes the display devices 1, 21, 41, 71, 91, 1 according to the first to ninth and eleventh embodiments.
This is shown as a modified example of 11, 141, 201, 221, 251. Corresponding portions are denoted by the same reference characters, and description thereof will be omitted. In FIG. 36, the liquid crystal panels 25 and 45, the liquid crystal elements 75 and 223, the wavelength selection element 1
15, polarization direction conversion element 145, hologram reproduction element 2
23, the portion other than the hologram plate 203, the EL display element 2
55, and the control units 29, 49, 79, 119, and 14
9, 209, 227, 257 are omitted for convenience, and the light source units 5, 27, 47, 77a, 77b, 9
5, 117, 147, 207, 225 and the EL display element 255 as a light source unit, only the light source 181 is described for convenience.

FIG. 50 shows the hologram plates 3, 23, 73 and 9.
3,143,203,253 (hereinafter, simply referred to as a hologram plate) on a three-dimensional image S, B, F, I, J, T, 261,
263 (hereinafter, simply referred to as a three-dimensional image). FIG. 51 is a diagram illustrating a state when reproducing a three-dimensional image recorded on a hologram plate. As shown in FIGS. 50 and 51, the wavelengths of the object light Lo and the reference light Lr having the same wavelength are set to λo, and the substantial light source points Po and P of the object light Lo and the reference light Lr are set.
The distances between r and the center point of the interference fringes of each three-dimensional image recorded on the hologram plate are Ro and Rr, respectively, and the incident angles of the object light Lo and the reference light Lr to the center point of the interference fringes are respectively θo and θr, the wavelength of the reproduction illumination light Lc is λc, and the distance between the substantial optical origin Pc of the reproduction reference light Lc and the center point of the interference fringes is R.
c, the distance between the image point Pi of the reproduction light Li and the center point of the interference fringes is Ri, the incident angle of the reproduction illumination light Lc to the center point of the interference fringes is θc, When the emission angle of the interference fringes from the center point is θi,
These parameters (λo, Ro, Rr, θo, θr)
It is known that there is the following relationship between and (λc, Ri, Rc, θc, θi) (for example, see “Introduction to Hologram” (Asakura Shoten), page 29). In the following equation, μ is given by λc / λo.

[0163]

(Equation 1)

At this time, by adjusting the parameters (λc, Rc, θc) with respect to the parameters (λo, Ro, Rr, θo, θr) based on this relational expression, a three-dimensional image is recorded on the hologram plate. It is known that the image can be reproduced with being enlarged larger than the image in which the three-dimensional image is recorded on the hologram plate. It is known that the magnification is m in the width direction parallel to the hologram plate and M in the depth direction orthogonal to the hologram plate.

[0165]

(Equation 2)

Here, in FIGS. 50 and 51, the xy plane is taken in parallel with the hologram plate, and the z-axis is taken in the direction perpendicular to the hologram plate. Each light source point Po, Pr, Pc and image point Pi are xz plane, each angle θo,
θr, θc, and θi are taken in the counterclockwise direction from the positive direction of the z-axis. The distances Ro, Rr, Rc, and Ri are positive for divergent light and negative for convergent light.

In the present embodiment, divergent light whose illumination area expands as the distance from the substantial light origins Po, Pr, Pc is used for the object light Lo, the reference light Lr, and the reproduction illumination light Lc. ing. In FIG. 50 and FIG. 51 described later, the image point Pi of the reproduced three-dimensional image is shown on the back side of the hologram plate, but this shows a true image point, and the driver actually Then, a conjugate image formed at a conjugate point on the opposite side of the center point of the interference fringe from the true image point will be seen.

Specifically, in this embodiment, as shown in FIGS. 52 and 53, each parameter (λo, R
o, Rr, θo, θr) at (550 nm, 20 cm, 1
00 cm, 1.0 °, 20 °), and the respective parameters (λc, Rc, θc) are set to (660 nm, 1 °, 20 °).
00 cm, 20 °), whereby the parameter (Ri, θi) is set to (−
26 cm, -2.3 °).
M = 1.56 in the width direction and M = 2.03 in the depth direction
The three-dimensional image is enlarged and reproduced at a magnification of.

The spaces 9, 31, 53, 81, 103, 1 where the three-dimensional image is enlarged and reproduced by the hologram plate
33 and 161, a translucent screen 183 is provided so as to face the hologram plate.
A three-dimensional image enlarged and reproduced by the hologram plate is projected onto the hologram plate.

Screen 183 on which a three-dimensional image is projected
Is a translucent material having a predetermined color such as milky white (for example, a frosted glass shape). This screen 183 is formed by cutting a three-dimensional image to be three-dimensionally enlarged and reproduced. The two-dimensional image is projected on the surface (back surface) facing the hologram plate, and the driver visually recognizes the projected image of the three-dimensional image projected on the back surface.

As described above, according to this embodiment, in addition to the effects of the above embodiments, various setting conditions such as the wavelengths of the object light and the reference light when recording a three-dimensional image on the hologram plate are used. On the other hand, by simply adjusting various setting conditions such as the wavelength of the reproduction reference light when reproducing the three-dimensional image from the hologram plate, the hologram plate itself can be used as a lens to magnify and reproduce the three-dimensional image. Since the three-dimensional image can be enlarged, the size of the three-dimensional image when recorded on the hologram plate can be reduced as much as the three-dimensional image is enlarged. As a result, the size of the hologram plate and the entire display device can be reduced. In addition to this, it is not necessary to separately provide a lens or the like for enlarging the three-dimensional image reproduced by the hologram plate, and the configuration of the apparatus can be simplified. When it is desired to further enlarge the enlarged and reproduced three-dimensional image, a lens for enlarging and displaying the three-dimensional image may be provided between the screen 183 and the driver.

Further, when the three-dimensional image is enlarged and reproduced by the lens effect of the hologram plate as described above, the reproduced three-dimensional image may be dark and the visibility of the displayed contents may be reduced. The three-dimensional image to be
Since the image is projected onto the image 83, a clear projected image can be obtained, and a decrease in the visibility of the displayed content can be prevented.

If a clear three-dimensional image can be reproduced without using the screen 183,
May not be provided.

As a modification of the display device according to the tenth and twelfth embodiments, the screens 171 and 183 on which a three-dimensional image is projected are moved toward and away from the hologram plate by a predetermined vibration applying means. By vibrating back and forth at a predetermined amplitude to change the projected image of the three-dimensional image projected on the screens 171 and 183, the three-dimensional image of the three-dimensional image is impaired by the projection on the screens 171 and 183. It may be prevented.

[0175]

According to the first and second aspects of the present invention,
Since a plurality of images respectively constituting a plurality of segments arranged according to a predetermined arrangement rule are multiplex-recorded on a single hologram plate so as to be reproduced independently from each other by reproduction illumination light having different incident directions. It is not necessary to provide a plurality of hologram plates, so that it is possible to reduce the size and space and to reduce the cost, and to control the on / off of a plurality of illumination devices for irradiating the reproduction illumination light, thereby displaying the reproduced image. Can be changed according to the visual information that changes every moment, the visual information whose contents change with time can be displayed, and there is an advantage that a mechanical configuration is not required and the configuration is simple. is there.

According to the third to seventh aspects of the present invention, a plurality of images necessary for displaying predetermined visual recognition information are individually recorded in a plurality of recording areas of the hologram plate. By controlling the reproduction illumination light from the light source unit incident on the liquid crystal panel, an image to be reproduced required for display is selected.
Since there is no need to provide a plurality of hologram plates, it is possible to reduce the size and space and to reduce the cost, and it is possible to change the display content of the reproduced image in accordance with the change in the visual recognition information. Can display visual information that changes in content, without the need for a mechanical configuration,
There is an advantage that the configuration is simple.

According to the fourth aspect of the present invention, a liquid crystal panel having a larger outer shape than the hologram plate is used. Since other visual information is displayed, there is no need to separately provide a liquid crystal panel for liquid crystal display and a liquid crystal panel for hologram display, and the size and space can be reduced and the cost can be reduced. Can be.

According to the seventh aspect of the present invention, since the polymer dispersed liquid crystal layer is used for the liquid crystal layer of the liquid crystal panel,
It is not necessary to use a polarizing plate, and it is possible to greatly reduce the loss of the amount of light generated when the reproduction illumination light from the light source unit passes through the liquid crystal panel.

According to the eighth aspect of the present invention, a plurality of images necessary for displaying the visual recognition information are individually recorded in the plurality of recording areas of the hologram plate, and the light source incident on each of the recording areas is provided. The image to be reproduced is selected by controlling the reproduction illumination light from the unit by the liquid crystal element, so that it is not necessary to provide a plurality of hologram plates, and it is possible to reduce the size, space and cost. The display content of the reproduced image can be changed according to the change in the visual recognition information, and the visual information whose content changes over time can be displayed. However, there is an advantage that the configuration is simple.

According to the ninth aspect of the present invention, a plurality of images necessary for displaying visual recognition information are reproduced independently from each other by reproduction illumination light of different wavelength components from each illumination means. Since multiple recording is performed on a single hologram plate, there is no need to provide a plurality of hologram plates, so that it is possible to reduce the size and space and reduce the cost, and to change the display content of the reproduced image and the visual information. Can be changed in accordance with the time, and it is possible to display visual recognition information whose contents change over time, and there is an advantage that a mechanical configuration is not required and the configuration is simple.

According to the tenth aspect of the present invention, a plurality of images necessary for displaying the visual recognition information are generated by the light of the wavelength components extracted by the wavelength selecting means from the light components emitted from the light source unit. Since the holograms are multiplex-recorded on a single hologram plate so as to be reproduced independently of each other, it is not necessary to provide a plurality of hologram plates. The display content of the image can be changed according to the change of the visual recognition information, the visual recognition information whose content changes over time can be displayed, and no mechanical configuration is required, and the configuration is simple. There are advantages.

According to the eleventh aspect of the present invention, a plurality of images necessary for displaying the visual recognition information are independent of each other by the reproduction illumination light from the light source unit whose polarization direction is controlled by the polarization direction conversion means. Since it is multiplex-recorded on a single hologram plate so that it can be reproduced, it is not necessary to provide a plurality of hologram plates, and it is possible to reduce the size and space and to reduce the cost, and to display the contents of the reproduced image. Can be changed according to the change of the visual recognition information, and the visual recognition information whose contents change with time can be displayed, and there is an advantage that a mechanical configuration is not required and the configuration is simple.

According to the twelfth aspect of the present invention, a plurality of images required for displaying the visual recognition information are simply reproduced so as to be independently reproduced by reproduction illumination light from light source units having different incident angles. It is multiplex-recorded on one hologram plate, and the image to be reproduced can be changed by changing the refractive index of the liquid crystal layer of the liquid crystal element. And the cost can be reduced, and the display content of the reproduced image can be changed according to the change of the shift position. Therefore, there is an advantage that a mechanical configuration is not required and the configuration is simple. .

According to the thirteenth aspect of the present invention, a hologram is formed such that a plurality of images necessary for displaying visual recognition information are independently reproduced by reproduction illumination light from light source units having different incident angles. Multiplexed holograms are recorded on a single hologram plate provided as a transparent substrate in the reproducing means, and the reproduced image can be changed by changing the refractive index of the liquid crystal layer of the hologram reproducing means. It is not necessary to provide a plate, and it is possible to reduce the size and space and to reduce the cost, and it is possible to change the display content of the reproduced image with the change of the shift position, without requiring a mechanical configuration. There is an advantage that the configuration is simple.

According to the fourteenth aspect, the image projected on the screen is enlarged and displayed by the lens, so that the size of the image recorded on the hologram plate can be reduced by the extent that the image is enlarged. As a result, the size of the hologram plate and the entire display device can be reduced.

Further, since the reproduced image is projected on the screen, a clear projected image can be obtained, and the visibility of the displayed content can be improved.

According to the fifteenth aspect, the display element is used not only as a display device but also as a light source for reproducing a hologram image. Therefore, a dedicated light source for reproducing illumination light is used. There is no need to provide a unit, so that the configuration of the display device can be simplified and downsized.

Further, by composing a predetermined display image by combining the image reproduced by the hologram plate and the image displayed by the display element, the visibility of the display image can be effectively improved.

According to the sixteenth aspect of the present invention, the dial image of the predetermined meter display is constituted by the image reproduced by the hologram plate, and the pointer image of the meter display is constituted by the image displayed by the display element. Therefore, the dial and the pointer can be clearly visually recognized, respectively, and the predetermined visual recognition information can be effectively displayed in an analog manner.

According to the seventeenth aspect, the predetermined visual recognition information is three-dimensionally displayed by the hologram plate.
The visibility of the visible information can be improved.

According to the eighteenth aspect of the present invention, the reproduction when reproducing an image from the hologram plate under various setting conditions such as the wavelengths of the object light and the reference light when recording the image on the hologram plate. By simply adjusting various setting conditions such as the wavelength of the reference light, the image can be enlarged and reproduced by using the hologram plate itself like a lens. It is possible to reduce the size of the image, thereby reducing the size of the hologram plate and the entire display device, and it is necessary to separately provide a lens and the like for enlarging the image reproduced by the hologram plate. Therefore, the configuration of the apparatus can be simplified.

According to the nineteenth aspect, when an image is enlarged and reproduced by the lens effect of the hologram plate as described above, the reproduced image may be dark and the visibility of display contents may be reduced. However, since the reproduced image is projected on the screen, a clear projected image can be obtained, and a decrease in the visibility of the displayed content can be prevented.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an overall configuration of a display device according to a first embodiment of the present invention.

FIG. 2 is a front view of a hologram plate provided in the display device of FIG.

FIG. 3 is a plan view showing a configuration of a three-dimensional image reproduced by the hologram plate of FIG. 2;

FIG. 4 is a diagram illustrating a state where three-dimensional display is performed by the display device of FIG. 1;

FIG. 5 is a diagram showing a state where three-dimensional display is performed by the display device of FIG. 1;

FIG. 6 is a diagram illustrating an overall configuration of a display device according to a second embodiment of the present invention.

FIG. 7 is a front view of a hologram plate provided in the display device of FIG. 6;

FIG. 8 is a plan view showing a configuration of a three-dimensional image reproduced by the hologram plate of FIG. 7;

9 is a front view of a liquid crystal panel provided in the display device of FIG.

FIG. 10 is a diagram illustrating a state where three-dimensional display is performed by the display device of FIG. 6;

FIG. 11 is a diagram illustrating a state in which three-dimensional display is performed by the display device of FIG. 6;

FIG. 12 is a diagram illustrating an overall configuration of a display device according to a third embodiment of the present invention.

FIG. 13 is a diagram showing a state where a display is being performed by the display device of FIG. 12;

FIG. 14 is a diagram illustrating an overall configuration of a display device according to a fourth embodiment of the present invention.

FIG. 15 is a front view of a hologram plate provided in the display device of FIG.

FIG. 16 shows 3 reproduced by the hologram plate of FIG.
It is a figure which shows the structure of a two-dimensional image in plane.

FIG. 17 is a diagram showing a state in which the incident position of the reproduction illumination light to the hologram plate is changed by a liquid crystal element provided in the display device of FIG.

FIG. 18 is a diagram showing a state in which the incident position of the reproduction illumination light to the hologram plate is changed by a liquid crystal element provided in the display device of FIG.

FIG. 19 is a diagram illustrating a state where three-dimensional display is performed by the display device of FIG. 14;

20 is a diagram illustrating a state where three-dimensional display is performed by the display device of FIG. 14;

FIG. 21 is a diagram illustrating an overall configuration of a display device according to a fifth embodiment of the present invention.

FIG. 22 is a front view of a hologram plate provided in the display device of FIG. 21;

FIG. 23 shows 3 reproduced by the hologram plate of FIG.
It is a figure which shows the structure of a two-dimensional image in plane.

24 is a diagram illustrating a state where three-dimensional display is performed by the display device in FIG. 21;

FIG. 25 is a diagram illustrating a state where three-dimensional display is performed by the display device of FIG. 21;

FIG. 26 is a diagram illustrating an overall configuration of a display device according to a sixth embodiment of the present invention.

FIG. 27 is a diagram illustrating a state where light of a predetermined wavelength component is extracted by a wavelength selection element provided in the display device of FIG. 26;

FIG. 28 is a diagram illustrating an overall configuration of a display device according to a seventh embodiment of the present invention.

FIG. 29 is a front view of a hologram plate provided in the display device of FIG. 28.

30 is a view 3 reproduced by the hologram plate of FIG. 29.
It is a figure which shows the structure of a two-dimensional image in plane.

31 is a diagram illustrating a state in which the polarization direction of the reproduction illumination light incident on the hologram plate is changed by the polarization direction conversion element provided in the display device of FIG. 28.

32 is a diagram illustrating a state in which the polarization direction of the reproduction illumination light incident on the hologram plate is changed by the polarization direction conversion element provided in the display device of FIG. 28.

FIG. 33 is a diagram illustrating a state where three-dimensional display is performed by the display device of FIG. 28;

FIG. 34 is a diagram illustrating a state where three-dimensional display is performed by the display device of FIG. 28;

FIG. 35 is a diagram illustrating an overall configuration of a display device according to an eighth embodiment of the present invention.

FIG. 36 is a front view of a hologram plate provided in the display device of FIG. 35;

FIG. 37 shows 3 reproduced by the hologram plate of FIG. 36.
It is a figure which shows the structure of a two-dimensional image in plane.

FIG. 38 is a diagram showing a state in which reproduction illumination light emitted from a light source unit is incident on a hologram plate via a liquid crystal element in the display device of FIG.

39 is a diagram illustrating a state where three-dimensional display is performed by the display device in FIG. 35.

40 is a diagram illustrating a state where three-dimensional display is performed by the display device in FIG. 35;

FIG. 41 is a diagram illustrating an overall configuration of a display device according to a ninth embodiment of the present invention.

42 is a diagram illustrating a state in which reproduction illumination light emitted from a light source unit is incident on a hologram plate via a liquid crystal layer in a hologram reproduction element in the display device of FIG. 41.

FIG. 43 is a diagram illustrating an overall configuration of a display device according to a tenth embodiment of the present invention.

FIG. 44 is a diagram illustrating an overall configuration of a display device according to an eleventh embodiment of the present invention.

FIG. 45 is a diagram illustrating a display state of the display device of FIG. 44.

FIG. 46 is a front view of a hologram plate provided in the display device of FIG. 44.

FIG. 47 is a diagram illustrating a state where three-dimensional display is performed by a hologram plate provided in the display device in FIG. 44;

FIG. 48 is a front view of an EL display element provided in the display device of FIG. 44.

FIG. 49 is a diagram illustrating an overall configuration of a display device according to a twelfth embodiment of the present invention.

50 is a diagram showing a state when a three-dimensional image is recorded on a hologram plate provided in the display device of FIG. 49.

FIG. 51 is a diagram illustrating a state in which a three-dimensional image recorded on a hologram plate provided in the display device of FIG. 49 is reproduced.

FIG. 52 is a diagram showing a state when a three-dimensional image is recorded on a hologram plate provided in the display device of FIG. 49 under specific setting conditions.

FIG. 53 is a diagram illustrating a state in which a three-dimensional image recorded on a hologram plate included in the display device of FIG. 49 is reproduced under specific setting conditions.

[Explanation of symbols]

1,21,41,71,91,111,141,20
1,211,251 Display device 3,23,73,93,143,203,253 Hologram plate 5,27,47,77a, 77b, 95,117,14
7, 207, 227 Light source unit 7, 97 Illumination control unit 25, 45 Liquid crystal panel 25a, 75, 123, 157, 205 Liquid crystal element 25b, 25c, 159 Polarizer 29, 49, 79, 119, 149, 209, 227,
257 Control unit 99,129,181 Light source 115 Wavelength selection element 125,127 High reflection / transmission surface 145 Polarization direction conversion element 171,183 Screen 173 Lens 223 Hologram reproduction element 255 EL display element A1 to An, H1 to H6 Illumination device S1 to S16, B1 to Bm, F1 to F6,
I1 to I6, J1 to J6, T1 to T6,2
61, 263 3D image D1 to D16, G1 to G6, 273, 275
Recording area Lc Reproduction illumination light Li Reproduction light Lo Object light Lr Reference light

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Nobuaki Koide 1-7-10 Kikuzumi, Minami-ku, Nagoya-shi, Aichi Harness Research Institute, Inc.

Claims (19)

[Claims] 1. Displaying predetermined visual information by displaying predetermined segments of a plurality of segments arranged according to a predetermined arrangement rule in a predetermined combination, and changing the combination of the segments to be displayed. A display device that changes the display content of the visual recognition information, whereby a plurality of images respectively configuring the plurality of segments are:
Hologram plates multiplex-recorded as interference fringes so as to be reproduced independently of each other by reproduction illumination light irradiated from different irradiation directions, a plurality of hologram plates are provided in accordance with the number of the images, and the irradiation is performed in accordance with the respective images. Illuminating means for irradiating the hologram plate with the reproduction illumination light from a direction, and by controlling on / off of the plurality of illuminating means according to the display content of the visual recognition information to be displayed, the hologram is recorded on the hologram plate A display device for selecting an image to be reproduced from the plurality of images. 2. The display device according to claim 1, wherein the plurality of segments constituted by the plurality of images are for displaying a predetermined numerical value as a segment by a number or a graph. 3. A plurality of images for displaying predetermined visual information are recorded as interference fringes in mutually independent recording areas, and a predetermined reproduction illumination light is applied to the interference fringes recorded in each recording area. A hologram plate for reproducing the image corresponding to the interference fringes when irradiated; a light source unit for irradiating the reproduction illumination light toward the hologram plate; and a region of the hologram plate on which at least the interference fringes are recorded A predetermined liquid crystal layer sandwiched between two transparent substrates having predetermined transparent electrodes formed on opposing surfaces while being disposed between the light source unit and the hologram plate so as to cover The reproduction reference light from the light source unit, which is incident from the light source unit side and is emitted toward each of the recording areas of the hologram plate, A liquid crystal panel capable of transmitting or blocking independently for each recording area by changing an applied voltage applied between the transparent electrodes in response to a control signal; and controlling the liquid crystal panel through the control signal. And an image selecting means for selecting an image to be reproduced from the plurality of images recorded on the hologram plate. 4. The liquid crystal panel has a larger outer shape than the hologram plate, and the light source unit irradiates the entire surface of the liquid crystal panel with the reproduction illumination light. The means controls the light transmittance of a portion of the liquid crystal panel facing the recording area of the hologram plate through the control signal, so that the light is transmitted from the plurality of images recorded on the hologram plate. By selecting an image to be reproduced and controlling the light transmittance of the peripheral portion of the liquid crystal panel that is not opposed to the hologram plate through the control signal, predetermined visibility information is provided on the peripheral portion of the liquid crystal panel. The display device according to claim 3, wherein the display device is displayed. 5. The display device according to claim 3, wherein, when the plurality of images are reproduced, a predetermined numerical value is displayed as a segment by a number or a graph. 6. A polarization direction conversion type liquid crystal layer in which a twist angle of a polarization direction of incident light changes with a change in an applied voltage applied between the transparent electrodes is used as the liquid crystal layer of the liquid crystal panel. A predetermined polarizing plate is provided on the outer surface side of the two transparent substrates.
6. The display device according to any one of claims 1 to 5. 7. A polymer-dispersed liquid crystal layer whose transmittance of incident light changes according to a change in an applied voltage applied between the transparent electrodes is used as the liquid crystal layer of the liquid crystal panel. The display device according to any one of claims 3 to 5, wherein 8. A plurality of images for displaying predetermined visual information are recorded as interference fringes independently of each other in a plurality of recording areas provided in accordance with a predetermined arrangement rule. A hologram plate that reproduces the image corresponding to the interference fringes on the front side when the predetermined reproduction illumination light is irradiated from the back side to the recorded interference fringes, and is arranged to face the back side of the hologram plate. A liquid crystal element in which a liquid crystal layer is formed between two transparent substrates having predetermined transparent electrodes formed on surfaces facing each other; and any one of the plurality of recording areas on the hologram plate A light source unit for irradiating the reproduction illumination light so as to be incident on the liquid crystal element via the liquid crystal element, and applying the reproduction illumination light to the liquid crystal element; And changing the applied voltage to change the refractive index of the liquid crystal layer to change the traveling direction of the reproduction illumination light from the light source unit incident on the liquid crystal layer, and to input the reproduction illumination light to the hologram plate. By controlling the position, a recording area to which the reproduction illumination light is to be incident is selected from the plurality of recording areas, and an image to be reproduced is selected from the plurality of images recorded on the hologram plate. A display device comprising: an image selection unit. 9. A display device for displaying predetermined visual information, wherein a plurality of images for displaying the visual information are recorded as interference fringes, and the plurality of images are reproduced at different wavelengths from each other. A hologram plate that is multiplex-recorded so as to be reproduced independently of each other by the illumination light, a plurality of hologram plates are provided so as to correspond to the plurality of images individually, and the wavelength of the wavelength corresponding to a corresponding image of the plurality of images is provided. A plurality of irradiation units each of which irradiates reproduction illumination light toward the hologram plate, and by controlling on / off of the plurality of irradiation units, an image to be reproduced from among the plurality of images recorded on the hologram plate. A display device comprising: an image selection unit for selecting. 10. A plurality of images for displaying predetermined visual recognition information are recorded as interference fringes, and the plurality of images are multiplexed so as to be reproduced independently from each other by reproduction illumination light having different wavelengths. A recorded hologram plate, a light source unit for irradiating the hologram plate with light containing at least light components of a plurality of wavelengths necessary for reproducing the plurality of images, the hologram plate and the light source unit And a liquid crystal element in which a liquid crystal layer is provided between two transparent substrates having transparent electrodes formed on surfaces facing each other, and high reflection and transmission provided on both surfaces of the liquid crystal element. Surface, and the incident light from the light source unit is emitted to the hologram plate side while being reflected between the two high-reflection transmission surfaces, so that, of the incident light, Wavelength selecting means for transmitting only light of a wavelength component corresponding to the optical path length between the two high reflection transmitting surfaces to the hologram plate side as the reproduction illumination light, and both transparent electrodes of the liquid crystal element provided in the wavelength selecting means By changing the applied voltage applied between them and changing the refractive index of the liquid crystal layer to control the optical path length between the high reflection / transmission surfaces, the light passes through the wavelength selection means and enters the hologram plate. A display device comprising: an image selection unit that controls a wavelength component of reproduction illumination light and selects an image to be reproduced from the plurality of images recorded on the hologram plate. 11. A plurality of images for displaying predetermined visual recognition information are recorded as interference fringes, and the plurality of images are reproduced independently of each other by reproduction illumination lights having polarization directions different from each other. A hologram plate that is multiplex-recorded, a light source unit that irradiates the hologram plate with predetermined light serving as the reproduction illumination light, and that is installed between the hologram plate and the light source unit and faces each other. A liquid crystal element provided with a liquid crystal layer between two transparent substrates having transparent electrodes formed on a surface thereof; and a polarizing plate provided on a surface of the liquid crystal element on the light source unit side. The light irradiated from the hologram plate as the reproduction illumination light through the polarizing plate and the liquid crystal element as the reproduction illumination light. By changing the applied voltage applied between the bright electrodes to change the twist angle of the polarization direction of the light while the light passes through the liquid crystal layer, the polarization direction of the reproduction illumination light incident on the hologram plate is changed. Controlling the torsion angle through the control signal, thereby controlling the polarization direction of the reproduction illumination light incident on the hologram plate, and controlling the plurality of images recorded on the hologram plate. An image selecting means for selecting an image to be reproduced from among the images. 12. A display device for displaying predetermined visual information, wherein a liquid crystal layer is provided between two transparent substrates having predetermined transparent electrodes formed on opposing surfaces, and the two transparent substrates are provided. A liquid crystal element in which the refractive index of the substrate and the refractive index of the transparent electrode formed on each of the transparent substrates are different from each other between the two transparent substrates; and one of the two transparent substrates of the liquid crystal element that emits light. A light source unit for irradiating predetermined light so as to be incident on the transparent substrate, and a light source unit which is disposed in close contact with the surface of the other transparent substrate of the two transparent substrates of the liquid crystal element, and A plurality of images for displaying information are multiplex-recorded as interference fringes so that they are reproduced independently of each other by the light from the light source units having different incident angles, and are interposed between the transparent electrodes of the liquid crystal element. Applied voltage When the incident angle of the light from the light source unit is changed by changing the refractive index of the liquid crystal layer,
A hologram plate that reproduces the image corresponding to the changed angle of incidence from the plurality of images; and a voltage applied between the transparent electrodes of the liquid crystal element is changed to change a refractive index of the liquid crystal layer. By controlling the
Image selection means for controlling an incident angle of the light from the light source unit to the hologram plate and selecting an image to be reproduced from among the plurality of images recorded on the hologram plate. Display device. 13. A display device for displaying predetermined visual information, comprising a predetermined transparent electrode, and one of two transparent substrates having a liquid crystal layer sandwiched between inner surfaces facing each other. A hologram reproducing means in which a hologram plate is used as a substrate and the transparent electrode provided on the hologram plate is provided on the outer surface of the hologram plate so that the hologram plate comes into direct contact with the liquid crystal layer; A light source unit for irradiating predetermined light so that the irradiating light is incident on the other transparent substrate of the two transparent substrates provided; and the two transparent substrates provided in the hologram reproducing means. Image selection means for controlling the refractive index of the liquid crystal layer by changing the applied voltage between the two transparent electrodes provided in the hologram plate, A plurality of images for displaying the visual recognition information are multiplex-recorded as interference fringes so as to be reproduced independently of each other by the light from the light source units having different incident angles, and the image selecting means is By changing the applied voltage between the two transparent electrodes of the hologram reproducing means to change the refractive index of the liquid crystal layer and controlling the incident angle of the light from the light source unit to the hologram plate, Wherein the image corresponding to the incident angle is selected from among the images and reproduced. 14. A hologram plate which records a predetermined image for displaying predetermined visual information as interference fringes, and reproduces the image when the interference fringes are irradiated with predetermined reproduction illumination light; A light source unit for irradiating the hologram plate with the reproduction illumination light, a screen on which the image reproduced by the hologram plate is projected, and a lens for enlarging a projected image of the image projected on the screen. A display device comprising: 15. An image for forming a display image for displaying predetermined visual information, which is formed of a translucent member, is recorded as interference fringes in a predetermined recording area, and a predetermined image is formed on the interference fringes. A hologram plate that reproduces the image when the reproduction illumination light is applied; and a hologram plate that is disposed to face at least the recording region of the hologram on the back surface side of the hologram plate and faces a front recording region of the hologram plate. When the portion emits light, the reproduction illumination light is emitted, and the portion of the hologram plate that does not face the recording area emits light, thereby forming the display image together with the image reproduced by the hologram plate. A display element for displaying a predetermined image; and a light source for the part of the display element facing the recording area of the hologram plate and the part not facing the recording area. Control means for controlling the display content of the display image constituted by the image reproduced by the hologram plate and the image displayed by the display element by controlling a state, Display device. 16. The display image is for performing a predetermined meter display, and the image reproduced by the hologram plate constitutes a dial image for the meter display, and is displayed by the display element. 16. The display device according to claim 15, wherein the image to be formed constitutes a pointer image for displaying the meter. 17. The display device according to claim 1, wherein the image recorded on the hologram plate is a three-dimensional image for displaying the visual recognition information three-dimensionally. 18. The hologram reproducing method in the display device according to claim 1, wherein the object light and the reference light for recording the image on the hologram plate, the reproduction illumination light, Using divergent light whose illumination area expands as the distance from the substantial light source point increases, the distance between the respective light source points of the object light and the reference light and the center point of the interference fringes recorded on the hologram plate. For each distance, each incident angle of the object light and the reference light with respect to the center point of the interference fringe, and the wavelength of the object light and the reference light, the light source point of the reproduction reference light and the interference The distance of the fringe to the center point, the incident angle of the reproduction illumination light with respect to the center point of the interference fringes,
A method of reproducing a hologram in a display device, wherein the image is reproduced while being enlarged larger than an image recorded on the hologram plate by adjusting a wavelength of the reproduction illumination light according to a predetermined rule. 19. The hologram reproducing method in a display device according to claim 18, wherein the image reproduced by the hologram plate is projected on a screen.