JPH1055026A - Projection type color display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a color display device capable of displaying a picture with high resolution without lowering the transmissivity of light and contrast even when an optical modulation element having a small number of picture elements is used in the case of obtaining large screen display by enlarging and projecting the picture displayed on the optical modulation element. SOLUTION: A microlens array 7 is arranged on an optical path leading to a projection lens 9 from a color synthesis means 6 and one convex lens is formed corresponding to four picture elements of the picture synthesized by the color synthesis means 6. By driving an actuator 8 (8a11, 8a12 and 8b21) synchronizing with a field signal supplied to the optical modulation elements 5a to 5c, the microlens array 7 is moved or vibrated in horizontal and vertical directions orthogonal to the optical axis of the light made incident on the microlens array 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection type color display device for enlarging and projecting an image displayed on a light modulation element to obtain a large-screen display, and more particularly, to divide one frame image into a plurality of fields and display the image. The present invention relates to a projection type color display device.

[0002]

2. Description of the Related Art FIG. 13 shows a schematic structure of a typical conventional projection type color display device. In FIG. 13, 1
Is a light source, 3 is a color separating means, 4 is a mirror, 5 is a light modulation element, 6 is a color synthesizing means, 9 is a projection lens, and 11 is a screen. The three light modulation elements 5 are transmission liquid crystal panels. As the light source 1, a metal halide lamp or a halogen lamp that can obtain a relatively uniform spectral distribution in the visible light region is used. The light from the light source 1 condensed by a reflector or the like is converted by a color separation unit 3 comprising a dichroic mirror or a dichroic prism into R light.
(Red), G (green), and B (blue). The light separated into the three primary colors enters a light modulation element 5 composed of three transmissive liquid crystal panels, and light modulation according to each image signal is performed. Each light modulated by the light modulation element 5 is
The images are synthesized into one image by a color synthesizing unit 6 including a dichroic mirror or a dichroic prism. The synthesized image is enlarged by the projection lens 9 and the screen 1
Projected to 1.

A projection display device can display a large area as compared with other display devices because an image is enlarged and projected by a projection lens, but has a problem of low resolution. The resolution of the projected image is determined by the number of pixels of the light modulation element and the size of the screen. In order to display a high-resolution image on a screen, it is necessary to increase the number of pixels of the light modulation element. However, when the number of pixels is increased, the manufacturing yield is reduced and the cost is increased. For example, SXGA (1280 × 102
The light modulation element having the number of pixels of 4) is a VGA (640 × 48
The cost is about 10 times that of the light modulation element having the number of pixels 0). In addition, the aperture ratio per pixel (the ratio of the effective area that transmits light to one pixel) decreases as the density of the pixels increases, so that it is difficult to obtain an image with a desired brightness. As described above, since the density of the pixels and the brightness of the image are in conflict with each other, a high-quality image cannot be obtained by simply increasing the density of the pixels of the light modulation element.

[0004] In order to solve this problem, there is a method of projecting using a plurality of light modulation elements. In the method using a plurality of light modulation elements, for example, a plurality of images are displayed vertically and horizontally using a plurality of display units like a multi-vision using a CRT (cathode ray tube) on a display device. However, in this method, since a plurality of display units are used, there is a problem that a screen cannot be made continuous at a connection portion of each display unit and a boundary is conspicuous. In addition, since it is difficult to manufacture a plurality of display units with exactly the same display characteristics, there is a problem that brightness of each display unit becomes uneven, and a joint between the display units becomes conspicuous. I have.

[0005] In order to solve this problem, a method of superimposing and displaying one image by using a plurality of display units is known. The projection display device described in Japanese Patent Application Laid-Open No. 3-166536 discloses an image distribution function unit that arbitrarily samples and divides display data of an original image, a plurality of display function units, and optically converts each display image. An image synthesizing function unit that synthesizes and displays an original image, and a projection function unit that projects a synthesized image are provided. FIG. 14 shows the basic configuration. FIG.
, 9 is a projection lens, 12 is a light supply unit composed of a plurality of light sources, 13 is a light modulation element group composed of a plurality of transmissive liquid crystal panels, and 14 is a composite image projected by the light modulation element group 13 and projected. This is an optical device for making the light enter the lens 9. For example, when superimposed display is performed using four transmissive liquid crystal panels 13, the aperture ratio of each pixel of each transmissive liquid crystal panel 13 is set to about 25%, and the projection is performed by shifting by a half pixel pitch in the horizontal and vertical directions. By doing so, it is possible to obtain an image with four times the resolution. FIG.
For four images as shown in FIG. 15D, FIG.
15A is shifted by a half pixel pitch in the horizontal direction with respect to the image of FIG. 15A, and the image of FIG. 15C is shifted by a half pixel pitch in the vertical direction with respect to the image of FIG.
If the image of (d) is projected with a half pixel pitch shifted in the horizontal direction and the vertical direction with respect to the image of FIG.
An image having a resolution four times as shown in FIG. 15E is obtained. By performing the superimposed display in this way, the non-uniformity of the display characteristics of the plurality of display units can be made inconspicuous. However, there is a problem in that it is difficult to adjust an optical system for projecting the images with a half pixel pitch shifted from each other, and in that a plurality of display units are used, so that the configuration is complicated and the cost is high.

As another means for increasing the resolution, there is a method of performing time-division display using one light modulation element. Time-division display is a method of displaying one field (one screen) by displaying a plurality of fields in time series. For example, JP-A-4-
The projection display device described in JP-A-113308 shifts a projected image by using an element for turning the polarization direction of transmitted light in the optical path from the light modulation element to the screen and a transparent element having a birefringence effect. Means and means for discrete projection on the screen. FIG. 16 shows the basic configuration of the projection display device. In FIG. 16, reference numeral 1 denotes a light source, 5 denotes a light modulation element composed of a liquid crystal panel for display, 15 denotes a liquid crystal panel for controlling the polarization direction, 16 denotes a quartz plate, 9 denotes a projection lens, and 11 denotes a screen. A quartz plate 16 is used as a transparent element having a birefringence effect. In this method, one frame of image data is divided and stored in a frame memory, and time-division display is performed by displaying an image in synchronization with a means for shifting a projected image. Further, a high-resolution display is performed by shifting the image in time series so as to interpolate the discretized image by using means for making the image of the light modulation element discrete.

As means for making the image discrete, there are a means for lowering the effective aperture ratio by blocking a part of a pixel, and a means for condensing light by using a microlens corresponding to one pixel. Means for shielding a part of the pixel, for example, by devising the arrangement of the wiring of the switching element provided in each pixel to reduce the light transmission area, to make the light transmission area of the pixel discrete I have. On the other hand, the means for condensing light using a microlens corresponding to one pixel condenses the light emitted from the pixel, thereby substantially discretizing the image without reducing the amount of light.

The means for shifting the projected image utilizes the birefringence effect. Using a crystal with optical anisotropy,
An image is shifted on a screen by a difference in refraction angle between ordinary light and extraordinary light. Here, a TN (twisted nematic) liquid crystal is used to rotate linearly polarized light by 90 degrees to switch between ordinary light and extraordinary light for a transparent element having a birefringence effect. Ordinary light perpendicularly incident on a transparent element having a birefringence effect goes straight, while extraordinary light is refracted by a predetermined angle on the incident surface and refracted by the same angle on the exit surface on the opposite side.
Due to this effect, the extraordinary light is shifted by a distance corresponding to the thickness of the transparent element with respect to the ordinary light. Therefore, if the thickness of the transparent element is set so as to shift by a distance corresponding to the pixel pitch (1/2 of the pixel pitch), a shift amount for interpolating a discretely formed image can be obtained.

[0009]

In the above-described time-division display, a polarization direction turning element and a transparent element having a birefringence effect as means for projecting at least discretely and means for shifting an image are required. By using one set of the polarization direction rotating element and the transparent element having the birefringence effect, the display can be divided into two fields in the horizontal or vertical direction, but the display can be divided into more fields in the horizontal or vertical direction. When the display is performed in two fields in both the horizontal and vertical directions, or when the display is divided into more fields in both the horizontal and vertical directions, the polarization direction rotating element and the birefringence are used. There is a problem that a plurality of sets of transparent elements having an effect are required, and the configuration of the plurality of elements is complicated.

Further, the method of shading a part of the pixel as a means for making the image discrete is easy to produce by simply making a slight change to the conventional liquid crystal panel, so that the structure becomes complicated. However, since a part of the pixel is shielded from light and the light transmission area is reduced, the image becomes darker than a conventional liquid crystal panel.

Although the birefringence effect is used as a means for shifting an image, the light emitted from the light modulator must be linearly polarized in order to use the birefringence effect.
To convert natural light into linearly polarized light, a polarizing plate is necessary, but the light is absorbed by the polarizing plate at about 60%, and only about 40% is transmitted. Furthermore, since a liquid crystal element is used as the means for rotating the polarization direction, light transmittance in the liquid crystal element becomes a problem. The liquid crystal element of the polarization direction rotating means is constituted by sandwiching liquid crystal between two glass substrates on which transparent electrodes are formed. The light transmittance of the transparent electrode is 90 per sheet.
%, The transmittance is about 80% for two sheets. Further, in consideration of the transmittance of the liquid crystal itself, the glass substrate, the quartz plate, and the like, the transmittance of light by the polarization direction rotating means is further reduced to about 65%. Further, in the case where resolution is increased in both the horizontal direction and the vertical direction, two sets of the polarization direction turning means and the quartz plate are required, so that the light transmittance is further reduced to about 40%. I will. Accordingly, the transmittance of the light passing through the polarizing plate for converting natural light into linearly polarized light and the light passing through the polarization direction rotating means is about 15 to 20%, and the resolution can be increased, but the light use efficiency is extremely reduced. I get only dark images.

Although TN liquid crystal is used as the light turning means, its responsiveness becomes a problem. The TN liquid crystal switches the orientation of molecules by turning on and off the voltage, and its response (switching time) is several milliseconds. When one frame (1/60 to 1/30 seconds) is divided into a plurality of fields when performing time-division display, the number of
Since it takes ten and several milliseconds, when the TN liquid crystal is used, the switching time of the polarization direction occupies several tens of% in one field. As a result, there arises a problem that the contrast of the image is reduced.

Although not described in the above-mentioned prior art documents, when color display is performed using three liquid crystal panels, a polarization direction rotating element and a transparent element having a birefringence effect are provided for each panel. Need to be arranged, and the configuration becomes complicated. There is also a method of arranging one polarization direction turning element and a transparent element having a birefringence effect after image synthesis by the color synthesis means. In this case, a micro lens is formed on the liquid crystal panel as discrete projection means. And the light use efficiency of the discrete projection means is reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and has the following objects.
It is an object of the present invention to provide a projection type color display device that can perform time-division display with a simple configuration without reducing light transmittance and contrast even with a light modulation element having a small number of pixels and display an image with high resolution. .

[0015]

SUMMARY OF THE INVENTION The object of the present invention is to provide a color separating means for separating light from a light source into light of a plurality of colors, and a plurality of pixels having a plurality of pixels for modulating the lights of the separated colors. In a projection type color display device including a light modulating element, a color synthesizing means for synthesizing a plurality of modulated colors of light, and a projecting means for enlarging and projecting a color image displayed by the plurality of light modulating elements on a screen. Adjacent to a plurality of light-condensing optical elements that include light emitted from a predetermined number of adjacent pixels among the plurality of pixels of the light modulation element in their respective apertures so that the image on the screen is separated into a plurality of pixels. A light-collecting means arranged, and a projection-area changing means for changing the image projection area on the screen to project an image displayed on the light modulation element so as to interpolate the image separated on the screen by the light-collecting means. With It is achieved by a projection type color display device which is characterized in that the time division display of one frame is composed of several fields.

The object of the present invention is to provide the projection type color display device, wherein the light condensing means and the projection area changing means are located on an optical path from the color synthesizing means to the projecting means. Achieved by a display device.

Further, the above object is achieved in the above-mentioned projection type color display device, wherein the light condensing means and the projection area changing means are provided for each light modulating element, and are respectively provided on the optical path from each light modulating element to the color synthesizing means. This is achieved by a projection type color display device characterized by being located.

The light condensing means of the above-mentioned projection type color display device is composed of a plurality of pixels (i × j) adjacent to each other among the plurality of pixels of the light modulation element.
A microlens array having a plurality of convex lenses including light emitted from pixels within respective apertures, or a lenticular lens array having a semicircular cross-sectional microlens corresponding to an adjacent i-line among a plurality of pixels of a light modulation element Alternatively, a first lenticular lens array having a microlens having a semicircular cross section corresponding to an adjacent i line among a plurality of pixels of the light modulation element, and a semicircular cross section corresponding to a j line orthogonal to the i line And a second lenticular lens array having microlenses.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A projection type color display according to a first embodiment of the present invention will be described with reference to FIGS. The projection type color display device according to the present embodiment modulates the light separated by the color separation means by using a plurality of light modulation elements and forms a color image by combining the light modulation elements with a display liquid crystal light valve or the like. It is characterized in that the projection display image can be made high definition without increasing the number of pixels of the light modulation element. As means for discretely separating an image for each of a plurality of pixels on the screen, light emitted from a plurality of pixels adjacent to the light modulation element or light emitted from a plurality of adjacent pixels of the light modulation element synthesized by the color synthesis means is used. The projection area changing means for projecting the display image by the light modulation element so as to interpolate the image separated on the screen by the micro lens array using the micro lens array included in each aperture, and the output from each light modulation element. Basically, time-division display is performed by discretely reducing the emitted light and interpolating the discrete gap. The projection type color display device according to the present embodiment includes a light source, a condensing optical component, a color separation / combination optical component, and a light modulation element such as a display liquid crystal light valve which is composed of a large number of pixels arranged in a two-dimensional manner. In addition to the components provided in a normal projection type color display device such as a projection lens, on the optical path from the light modulation element to the screen, the light emitted from the light modulation element is collected for each of a plurality of pixels and discretely collected. The microlens array to be reduced and the gap image discretely reduced by moving the microlens array or the projection means in a plane orthogonal to the incident optical axis in synchronization with the field signal supplied to the light modulation element. And a projection area changing means for increasing the number of pixels / definition by performing interpolation.

In this embodiment, each of a plurality of pixels adjacent to the light modulating element synthesized by the color synthesizing means is defined as four pixels, and a plurality of condensing optical elements including the light emitted from the four pixels within the diameter of the light modulating element. Is a convex lens.

FIG. 1 is a basic configuration diagram of a projection type color display device according to the present embodiment, FIG. 2 is a perspective view of a microlens array used in the present embodiment, and FIG. 4 and 5 are explanatory diagrams showing the positional relationship between the light modulating element and the convex lens according to the present embodiment. FIG. 4 is a diagram showing the positional relationship between the light modulating element and the convex lens. FIG. 5 is a sectional view taken along line AA ′ of FIG. 4 of a plane parallel to the optical axis from the light modulation element to the object plane of the projection lens. Figure 6 shows one screen as 4
FIG. 7 shows a positional relationship of an incident light beam on an object plane of a projection lens when the image is divided into two images.

In FIG. 1, 1 is a light source, 2 is a collimating conversion lens for converting light from the light source into parallel light, 3
Is a color separating means composed of a dichroic prism, 4 is a mirror, 5a to 5c are light modulation elements composed of a large number of pixels arranged two-dimensionally, 6 is a color synthesizing means composed of a dichroic prism, and 7 is a microlens. Array, 8
Is an actuator composed of a piezoelectric element, 9 is a projection lens,
10 is an object plane of the projection lens, and 11 is a screen.
The microlens array 7 is arranged on an optical path from the color synthesizing unit 6 to the projection lens 9, modulated by the light modulation elements 5 a to 5 c, and corresponds to four pixels of an image synthesized by the color synthesizing unit 6. A convex lens is formed. The actuators 8 are actuators 8a11 and 8a12 for vibrating the microlens array 7 in the vertical direction (vertical direction on the paper).
And actuators 8a21 and 8a22 (not shown) that vibrate in the horizontal direction (the direction normal to the paper surface). By driving the actuator 8 in synchronization with the field signals supplied to the light modulation elements 5a to 5c,
The microlens array 7 can be moved or vibrated in a horizontal / vertical direction orthogonal to the optical axis of the light incident on the microlens array 7.

Light modulation elements 5a to 5 used in this embodiment
c denotes an active device using a poly-Si TFT (thin film transistor using polycrystalline silicon for a channel layer).
This is a matrix type liquid crystal light valve. The liquid crystal material of the liquid crystal light valve does not require a polarizing plate, and is a liquid crystal polymer composite (Liquid Crystal Polymer).
r Composite). The number of pixels of each of the light modulation elements 5a to 5c is m × n, and the pixel pitch p is 50 μm which is a general value both in the horizontal and vertical directions. The light modulation elements 5a to 5c are arranged such that the corresponding pixels overlap on the screen 11.

The microlens array 7 shown in FIG. 2 is formed by using, for example, an ion exchange method. In this method, certain kinds of ions are diffused into a transparent glass substrate to form layers having different refractive indices and are used as a lens effect. The microlens array 7 is designed to collect as much as possible light beams emitted from the four pixels,
It is composed of a number of convex lenses formed at a pitch of 100 μm. Since the size of the microlens array 7 can be formed to be almost the same size as the light modulation elements 5a to 5c, the weight can be reduced to about several grams.

The actuator 8 uses a laminated piezoelectric element made of a high distortion piezoelectric ceramic material. The actuator 8 is adhered to the side surface of the microlens array 7, and a voltage is applied in synchronization with field signals supplied to the light modulation elements 5 a to 5 c, so that the horizontal direction orthogonal to the optical axis of light incident on the microlens array 7 is obtained. / The micro lens array 7 can be moved and changed in the vertical direction.

In FIG. 1, the light emitted from the light source is collimated by the collimating conversion means 2, and
The color separation means 3 separates the color into three colors of RGB. The lights separated into three colors are incident on three light modulation elements 5a to 5c, and light modulation is performed according to the respective image signals. The light modulating element 5a modulates green (Green) light, the light modulating element 5b modulates red (Red) light, and the light modulating element 5c modulates blue (Blue) light. Each of the light modulation elements 5a to 5c
Are modulated by the color combining means 6 to form one image. The color composition will be described with reference to FIG. Green light of the light color-separated by the color separation means 3 is incident on the light modulation element 5a. The incident Green light is modulated by the light modulation element 5a. The light emitted from the pixel G3 of the light modulation element 5a passes through the color synthesizing means 6 and proceeds straight. Red light of the light that has been color-separated by the color separation means 3 is incident on the light modulation element 5b. Re incident
The light d is modulated by the light modulation element 5b. The light emitted from the pixel R3 of the light modulation element 5b is
The light is reflected by the reflection surface 6a that reflects the ed light, and is combined with the light emitted from the pixel G3 of the light modulation element 5a. At this time, the pixel rows G1 to G4 of the light modulation element 5a and the light modulation element 5
In the pixel rows R1 to R4 of b, the corresponding pixels are in a mirror image relationship. The blue light of the light color-separated by the color separation means 3 is incident on the light modulation element 5c. The incident Blue light is modulated by the light modulation element 5c. Light modulation element 5c
Light emitted from the pixel B3 of the color
The light modulating element 5 is reflected by the reflecting surface 6b that reflects light.
The light emitted from the pixel G3 of a and the light emitted from the pixel R3 of the light modulation element 5b are combined. In the pixel rows B1 to B4 of the light modulation element 5c, similarly to the pixel rows R1 to R4 of the light modulation element 5b, the pixels corresponding to the pixel rows G1 to G4 of the light modulation element 5a have a mirror image relationship. As described above, each light modulating element 5
Light G3, R3, B3 emitted from one pixel of a to 5c
Are combined by the color combining means 6 to form one pixel.

The operation of shifting an image by the microlens array 7 and the actuator 8 and displaying a high-definition image in the present embodiment will be described with reference to FIGS. In the present embodiment, one screen (frame) is divided into four images (fields) and displayed. Note that the actual planar shape of each microlens is 4 as shown in FIG.
Each of the microlenses has a rectangular shape including the whole of one pixel within the aperture, but in the plan views of FIGS. 4 and 6, each microlens is shown by a solid or broken circle in order to clarify the position of each microlens.

In the first field of the first frame, the relative position between the image synthesized by the color synthesizing means 6 and the microlens array 7 is as shown in FIG. For example, the central axis of the microlens 7 ′ is located at the intersection of the pixels of the color-combined image, and the light emitted from the pixel is collected by one microlens 7 ′. As shown in FIG. 5, the outgoing lights 101 and 102 from the pixels of the light modulating element 5 are combined by the color combining means 6 and become the outgoing lights 101 ′ and 102 ′ collected by the microlens array 7 to form a projection lens. 9
Incident on. At this time, the object surface 10 of the projection lens 9 is located at a position where the light combined by the color combining means 6 is condensed to approximately ４. The display image on the object plane 10 of the projection lens 9 is in a state where it is thinned out in the horizontal / vertical directions as shown in FIG.

Next, in the second field, the actuator 8a1 vibrates in the vertical direction in synchronization with the field signal.
By 1 and 8a12, the microlens array 7 is moved in a vertical direction in a plane orthogonal to the optical axis of the light incident on the microlens array 7. The central axis of the micro lens 7 'is the position of the intersection of the pixels of the color-combined image,
That is, it moves to the position shown in FIG. Here, the amount of movement of the microlens array 7 from the position of FIG. 4A to the position of FIG.
μm. At this time, as shown in FIG.
Outgoing lights 101 and 102 from the pixel and the outgoing light 101 ″, 1
02 "and enters the projection lens 9. At the object plane 10 of the projection lens 9, the light is condensed at the position shown in FIG. 6B, and is vertically reduced discretely in the first field by the microlens array 7. Is interpolated in the second field.

Next, in the third field, the actuator 8a2 vibrates in the horizontal direction in synchronization with the field signal.
The microlens array 7 is moved in the horizontal direction within a plane orthogonal to the optical axis of the light incident on the microlens array 7 by 1, 8a22. The center axis of the microlens 7 'moves to the position of the intersection of the pixels of the color-combined image, that is, the position of FIG. Here, the microlens array 7 from the position of FIG. 4B to the position of FIG.
Is the same as the pixel pitch p of each light modulation element 5, 50 μm.
m. As a result, the light synthesized by the color synthesis means 6 is
6C is focused on the object plane 10 of the projection lens, and the horizontal gap discretely reduced in the second field by the microlens array 7 is interpolated in the third field. Will be.

Next, in the fourth field, the actuator 8a1 vibrates in the vertical direction in synchronization with the field signal.
The microlens array 7 is moved in the direction perpendicular to the optical axis of the light incident on the microlens array 7 in steps 1 and 8a12. The center axis of the micro lens 7 'moves to the position of the intersection of the pixels of the color-combined image, that is, the position of FIG. Here, the microlens array 7 from the position of FIG. 4C to the position of FIG.
Is the same as the pixel pitch p of each light modulation element 5, 50 μm.
m. As a result, the light synthesized by the color synthesis means 6 is
6D is focused on the object plane 10 of the projection lens 9 and discretely reduced in the third field by the microlens array 7 in the third field, that is, the first gap.
That is, the horizontal gap discretely reduced by the field No. is interpolated by the fourth field.

By the first, second, third and fourth fields described above, the image information of all one frame is shown in FIG.
As shown in (1), the display is formed by the object surface 10 of the projection lens 9, that is, the screen 11, and high-definition display can be realized by using the light modulation elements 5a to 5c with low definition.

Next, in the first field of the second frame, the actuators 8a21 and 8a22 which vibrate in the horizontal direction in synchronization with the field signal horizontally move in a plane orthogonal to the optical axis of the light incident on the microlens array 7. The micro lens array 7 is moved in the direction. The central axis of the micro lens 7 'is a pixel of a color-combined image,.
4A, that is, the position of FIG. Here, the amount of movement of the microlens array 7 from the position in FIG. 4D to the position in FIG. 4A is 50 μm, which is the same as the pixel pitch p of each light modulation element 5. As a result, the light synthesized by the color synthesizing means 6 passes through the object plane 10 of the projection lens 9 as shown in FIG.
And returns to the same position as the first field of the first frame. Thereafter, by interpolating the gaps in the horizontal / vertical directions discretely reduced in the same manner as in the first frame, 4 × (m × n) using the light modulation elements 5a to 5c having (m × n) pixels. 3.) High-definition display having pixels is realized.

Here, four adjacent pixels are displayed in a time-division manner. However, if four field images are displayed within a short period of about one frame period (1/30 msec) of a normal television image, human Can be viewed as one high-definition image due to the afterimage effect of the eye.

In the conventional projection type color display device, the image can be displayed on the screen 11 only at a resolution determined by the number of pixels of each of the light modulation elements 5a to 5c. To each of the light modulation elements 5a to 5c
Can be displayed at twice the resolution determined by the number of pixels. Since the microlens array 7 is used as means for making the image discrete, the light use efficiency is not reduced unlike the means for blocking the light emitted from the light modulation element 5. Also, since the interpolation of the gap is performed by mechanical vibration by the actuator 8, an optical system with light absorption, such as a polarizing plate or a liquid crystal panel for rotating the polarization direction for shifting an image, is used for the color combining means 6. Since it does not exist on the optical path from to the screen 11, a bright and high-definition image can be displayed without lowering the light use efficiency.

In the present embodiment, one frame is formed by four fields using a microlens array 7 composed of a plurality of microlenses corresponding to four pixels (2 × 2 pixels) of a color-combined image. Configuration, but 9
From a plurality of microlenses corresponding to (i × j) pixels such as pixels (3 × 3 pixels), 16 pixels (4 × 4 pixels), or 6 pixels (2 × 3 pixels) or 12 pixels (3 × 4 pixels) It is also possible to form one frame in (i × j) fields using the microlens array 7. At this time, the horizontal / vertical movement amounts Lh and Lv of the microlens array 7 with respect to one field signal by the actuator 8 are represented by i, the number of pixels of the microlens corresponding to a plurality of pixels corresponding to the horizontal direction, and the number of movements corresponding to the vertical direction. When the number of pixels to be performed is j, the pixel pitch in the horizontal direction is ph, and the pixel pitch in the vertical direction is pv, ph ≦ Lh ≦ (i−1) × ph pv ≦ Lv ≦ (J-1) × pv.

In the present embodiment, the actuator 8 uses a laminated piezoelectric element made of a high-strain-rate piezoelectric ceramic material, but the microlens array is synchronized with the frequency of the field signal supplied to the light modulation element 5. Any means capable of moving and changing the microlens array 7 by an integral multiple of the pixel pitch p of the light modulation element 5 in a plane orthogonal to the optical axis of the light incident on the light modulation element 5 may be used. The frequency of the field signal supplied to the light modulation element 5 is several tens Hz to several hundreds H
Because of z, an electromagnetic actuator, a linear actuator, a stepping motor, or the like can be used as the actuator 8.

The same effect can be obtained by moving and changing the projection lens 9 instead of vibrating the micro lens array 7. In this case, the pixel position on the screen 11 in each image when one screen (frame) is divided into a plurality of images (fields) is different from the case where the light condensing unit is moved and changed. The same effect can be obtained by moving and changing any lens of the projection lens 9, but it is desirable to move and change the lightest lens, and generally it is preferable to move and change the rear lens.

In the present embodiment, the microlens array 7 corresponding to a plurality of pixels is moved and changed. However, a plurality of condensing optical elements each including the light emitted from a plurality of pixels adjacent to the light modulation element in each aperture are provided. It is sufficient if there is a light condensing means arranged adjacently and a means for changing the projection area so as to interpolate the projection image discrete by the light condensing means. Optical Technology Contact, Vol. 32, No. 11, p.
8, 1994), and a voltage may be selectively applied in synchronization with a field signal to change the lens formation position.

A projection type color display according to a second embodiment of the present invention will be described with reference to FIGS. The projection type color display device according to the present embodiment includes a microlens array for condensing light emitted from a plurality of pixels adjacent to the light modulation element and a projection area changing means on an optical path from the light modulation element to the color combining means. It is characterized by a plurality of points.

FIG. 7 is a basic configuration diagram of a projection type color display device according to the present embodiment, and the same components as those in FIG. 1 are denoted by the same reference numerals. In FIG. 7, reference numeral 1 denotes a light source, 2 denotes a collimating conversion lens for converting light from the light source into parallel light, 3 denotes a color separation unit composed of a dichroic prism, 4 denotes mirrors, 5a to 5c denote light modulation elements, and 6
Denotes color synthesizing means composed of dichroic prisms, 7a to
7c is a micro lens array, 9 is a projection lens, 10 is an object plane of the projection lens, and 11 is a screen. The micro lens arrays 7a to 7c are arranged on an optical path from the light modulating elements 5a to 5c to the color synthesizing means 6, and the light modulating elements 5a to 5c
One convex lens is formed corresponding to the four pixels a to 5c. Although not shown in FIG. 7, the microlens arrays 7a to 7c have actuators 8a11 and 8a1 that vibrate the microlens arrays 7a to 7c in the vertical direction (up, down, left, and right on the paper), as in the first embodiment.
2 and actuators 8a21 and 8a22 that vibrate in the horizontal direction (the direction normal to the paper surface) are provided. The microlens arrays 7a to 7c are arranged in horizontal and vertical directions orthogonal to the optical axes of the light incident on the microlens arrays 7a to 7c. 7c can be moved or vibrated.

The light emitted from the light source is collimated by the collimating conversion means 2 and is converted by the color separation means 3 into RGB light.
Are separated into three colors. The lights separated into three colors are incident on three light modulation elements 5a to 5c, and light modulation is performed according to the respective image signals. Each of the light modulation elements 5a to 5
The light emitted from c is collected by the microlens arrays 7a to 7c, respectively.

In the present embodiment, when one screen (frame) is divided into four images (fields) and displayed, a light modulation element 5a for forming a green image and a corresponding microlens array The operation of 7a will be described with reference to FIGS. 8 and 4 and 6 used in the first embodiment. Note that reference numerals 5 and 7 'in FIG. 4 are read as 5a and 7a', respectively, and reference numeral 10 in FIG.
(The same shall apply hereinafter).

In the first field of the first frame,
The relative positions of the pixels of the light modulation element 5a and the microlens array 7a are as shown in FIG. The central axis of the micro lens 7a 'is a pixel of the light modulation element 5a,
,,, And outgoing light from the pixels,... Are collected by one microlens 7a ′. As shown in FIG. 8, the outgoing lights 101 and 102 from the pixels of the light modulation element 5a become outgoing lights 101 'and 102' collected by the microlens array 7a and enter the projection lens 9. At this time, the object surface 10a of the projection lens 9 is located at a position where the light from the light modulation element 5a is condensed to approximately 1/4. The display image of Green on the object plane 10a of the projection lens 9 is in a state where it is thinned out in the horizontal and vertical directions as shown in FIG.

Next, in the second field, the actuator 8a1 vibrates in the vertical direction in synchronization with the field signal.
By means of 1, 8a12, the microlens array 7a is moved in a vertical direction within a plane orthogonal to the optical axis of the light incident on the microlens array 7a. The central axis of the micro lens 7a 'moves to the position of the intersection of the pixels of the light modulation element 5a, that is, the position of FIG. Here, FIG.
The movement amount of the microlens array 7a from the position of FIG. 4A to the position of FIG.
50 μm, which is the same as At this time, as shown in FIG.
Numeral 2 is condensed by the microlens array 7a, becomes outgoing light 101 ", 102", and enters the projection lens 9.
The display image of Green on the object plane 10a of the projection lens 9 is condensed at the position shown in FIG. 6B, and the vertical gap portion discretely reduced in the first field by the microlens array 7a is formed. This means that interpolation has been performed in the second field.

Next, in the third field, the actuator 8a2 vibrates in the horizontal direction in synchronization with the field signal.
The microlens array 7a is moved in the horizontal direction within a plane orthogonal to the optical axis of the light incident on the microlens array 7a by 1, 8a22. The central axis of the micro lens 7a 'moves to the position of the intersection of the pixels of the light modulation element 5a, that is, the position of FIG. Here, FIG.
The amount of movement of the microlens array 7a from the position shown in FIG. 4B to the position shown in FIG.
50 μm, which is the same as As a result, the green display image emitted from the light modulation element 5a is condensed at the position shown in FIG. 6C on the object plane 10a of the projection lens, and is discretely dispersed in the second field by the microlens array 7a. This means that the reduced horizontal gap is interpolated in the third field.

Next, in the fourth field, the actuator 8a1 vibrates in the vertical direction in synchronization with the field signal.
The microlens array 7a is moved in a direction perpendicular to the optical axis of light incident on the microlens array 7a in steps 1 and 8a12. The central axis of the microlens 7a 'moves to the position of the intersection of the pixels of the color-combined image, that is, the position of FIG. Here, FIG.
The amount of movement of the microlens array 7a from the position shown in FIG. 4C to the position shown in FIG.
50 μm, which is the same as As a result, the green display image emitted from the light modulation element 5a is condensed at the position shown in FIG. 6D on the object plane 10a of the projection lens 9, and is discretely dispersed in the third field by the microlens array 7a. That is, the vertical gap reduced in the vertical direction, that is, the horizontal gap discretely reduced in the first field is interpolated by the fourth field.

By the above-mentioned first, second, third and fourth fields, the image information of all one frame is shown in FIG.
As shown in the figure, the projection lens 9 is formed on the object plane 10a. The above is the light modulation element 5a and the micro lens array 7a.
This is an explanation of a Green display image, but it goes without saying that the same operation is performed for the other two colors. The image of Red is the object surface 10b of the projection lens.
Then, the image of Blue is formed on the object plane 10c of the projection lens. High-definition three-color images obtained by using the light modulating elements 5a to 5c and the microlens arrays 7a to 7c are synthesized by the color synthesizing means 6 and projected on the screen 11 by the projection lens 9 to obtain a high-definition color. Images can be displayed. Object surfaces 10a to 10 corresponding to three-color images
By setting 10c so that the optical distance from the projection lens 9 is equal, it is possible to prevent color shift by the color synthesizing means 6. As in the first embodiment, the color combining by the color combining unit 6 is such that Green light is transmitted through the color combining unit 6 and Red light is reflected by the reflection surface 6 a of the color combining unit 6 that reflects the Red light. Then, the blue light is reflected by the reflection surface 6b of the color combining means 6 which reflects the blue light.

Each of the microlens arrays 7a to 7c needs to be moved in synchronization with the same field signal as the field signal input to each of the light modulation elements 5a to 5c. By making the operations of the microlens arrays the same, RGB images displayed on the screen can be displayed in a superimposed manner. Fig. 6
Since the areas (a), (b), (C), and (d) are displayed, the R, G, and B images are all shown in FIG. 6 (a) → (b) →
By being displayed in the order of (C) → (d), 1
One high-definition color image is formed.

On the other hand, each of the micro lens arrays 7a to 7c
The display can be performed without making the operations described above the same. For example, the Red image is displayed in four fields in the order of FIG. 6 (a) → (b) → (c) → (d), while the Green image is displayed in four fields.
The display of the areas of (b) → (c) → (d) → (a) is performed in order, and the image of Blue is composed of four fields, as shown in FIG.
The display of the areas of → (d) → (a) → (b) may be performed in order. If the display by each light modulation element and each microlens array forms one image in four fields, one high-definition color image is formed by performing color synthesis. In this case, it is necessary to send image signals corresponding to the operations of the microlens arrays 7a to 7c to the corresponding light modulation elements 5a to 5c.

Further, as long as the display by each light modulation element and each microlens array forms one image in four fields, there is no problem even if the timing of each field signal is shifted. For example, when the image of Red is displayed in the field for displaying the area of FIG.
The green image is displayed in the area shown in FIG. 6A by shifting the field, and further shifted by 1/3 field to B
The image of lue is displayed in the area shown in FIG. Also in this case, the image signals corresponding to the operations of the microlens arrays 7a to 7c are transmitted to the corresponding light modulation elements 5a to 5c.
Must be sent to

In this case, four adjacent pixels are displayed in a time-division manner. If four field images are displayed within a short period of about one frame period (1/30 msec) of a normal television image, a human is displayed. Can be viewed as one high-definition image due to the afterimage effect of the eye.

According to the present embodiment, the following effects can be obtained in addition to the effects of the first embodiment. First, since the distance between the light modulation element and the microlens array can be shortened, it is possible to reduce the possibility that light emitted from the light modulation element enters a microlens different from the corresponding microlens and lowers the image contrast. Can be. In addition, since the microlens array corresponding to each color is provided, it is possible to reduce the color shift of the image on the screen.

Next, a projection type color display device according to a third embodiment of the present invention will be described with reference to FIGS. The present embodiment is characterized in that a plurality of condensing optical elements each including light emitted from a plurality of pixels adjacent to the light modulation element within each aperture are lenticular lenses corresponding to two pixel rows. The other basic configuration is the same as that of the first embodiment.

FIG. 9 is a diagram showing a basic configuration of a projection type color display device according to the present embodiment. FIG. 10 shows one screen as two
FIG. 7 is a perspective view showing a positional relationship between light emitted from a light modulation element and a lenticular lens array and an object plane of a projection lens, which are combined by a color combining unit when the image is divided into two images.
FIG. 11 shows the positional relationship of the incident light beam on the object plane of the projection lens. FIG. 12 is a perspective view showing the positional relationship between the light emitted from the light modulating element and the lenticular lens array and the object plane of the projection lens synthesized by the color synthesis means when one screen is divided into four images.

In FIG. 9, 1 is a light source, 2 is a collimating conversion lens for converting light from the light source into parallel light, 3
Is a color separating means composed of a dichroic prism, 4 is a mirror, 5a to 5c are light modulation elements composed of a large number of pixels arranged two-dimensionally, 6 is a color synthesizing means composed of a dichroic prism, and 7a is a lenticular lens. Arrays, 8a1 and 8a2 are actuators composed of piezoelectric elements, 9 is a projection lens, 10 is the object plane of the projection lens, 11
Is the screen. Lenticular lens array 7a
Are arranged on the optical path from the color combining means 6 to the projection lens 9. The actuator 8 is configured to vibrate the lenticular lens array 7a in the horizontal direction.
a1 and 8a2. The lenticular lens array 7a can be moved or vibrated in a horizontal direction orthogonal to the optical axis of the light incident on the lenticular lens array 7a.

Light modulation elements 5a-5 used in the present embodiment
c is p which is equivalent to that of the light modulation element used in the first embodiment.
This is an active matrix type liquid crystal light valve using an poly-Si TFT. The lenticular lens array 7a is composed of a large number of 100 μm pitch lens-shaped lenses designed to collect as much as possible light beams emitted from pixels for two lines. The size of the lenticular lens array 7a is determined by the light modulation elements 5a to 5
Since it can be formed in almost the same size as c, the weight can be reduced to about several grams.

Actuator 8 in the present embodiment
Also, a laminated piezoelectric element made of a high distortion piezoelectric ceramic material is used. The actuator 8 is adhered to the side surface of the lenticular lens array 7a, and the light modulation elements 5a to 5c
By applying a voltage in synchronization with a field signal supplied to the lenticular lens array 7a, the lenticular lens array 7a can be moved and changed in a horizontal direction orthogonal to the optical axis of light incident on the lenticular lens array 7a.

The light emitted from the light source is collimated by the collimating conversion means 2 and is converted by the color separation means 3 into RGB light.
The three primary colors are separated. The lights separated into three colors are incident on three light modulation elements 5a to 5c, and light modulation is performed according to the respective image signals. Each light modulation element 5a-
The light modulated by 5c is combined by the color combining means 6 to form one image.

Hereinafter, the operation of shifting the image by the lenticular lens array 7a and the actuator 8 to display a high-definition image in this embodiment will be described with reference to FIGS. In the present embodiment, 1
The screen (one frame) is divided into two images (two fields) and displayed.

In the first field of the first frame,
The relative position between the light from the light modulating elements 5a to 5c synthesized by the color synthesizing means 6 and the lenticular lens array 7a is at the position shown in FIG. Outgoing light 10 from two adjacent rows 5c
1, 111 and 102, 112 are condensed by a lenticular lens having the same central axis as the outgoing light 101 ', 111' and 102 ', 112' and incident on the projection lens 9. The object plane 10 of the projection lens 9 is
The light from a to 5c is provided at a position where the light is converged in half in the horizontal direction. Therefore, the image displayed on the object plane 10 of the projection lens is thinned out in the horizontal direction as shown in FIG. 11A, that is, discretely reduced.

Next, in the second field of the first frame, the lenticular lens array 7a is driven by the actuators 8a1 and 8a2 which vibrate in synchronization with the field signal.
The lenticular lens array 7a is moved in the horizontal direction within a plane perpendicular to the optical axis of the light incident on the lenticular lens array 7a to the position shown in FIG. Here, the moving amount of the lenticular lens array 7a from the position of FIG. 10A to the position of FIG. 10B is 50 μm, which is the same as the pixel pitch p of the light modulation elements 5a to 5c. At this time, outgoing lights 101, 111 and 102 from two adjacent rows of the light modulation elements 5a to 5c,
Reference numeral 112 denotes output lights 101 ", 111", and 102 "by different lenticular lenses having different center axes.
The light is condensed as shown at 112 "and is incident on the projection lens 9. On the object plane 10 of the projection lens, the light is condensed at the position shown in FIG. 11B, and is horizontally reduced discretely by the lenticular lens array 7a. This means that the gap is interpolated in the second field.

According to the first and second fields of the first frame, the image information of the entire frame is converted to the format shown in FIG.
As shown in (c), the light modulation elements 5a to 5d are formed on the object plane 10 of the projection lens, that is, on the screen 11, and have low definition.
Using 5c, a display with high definition can be realized.

Next, in the first field of the second frame, the lenticular lens array 7a is driven by the actuators 8a1 and 8a2 which vibrate in synchronization with the field signal.
The lenticular lens array 7a is moved in the horizontal direction in a plane perpendicular to the optical axis of the light incident on the lenticular lens, and is moved to the position shown in FIG. Here, from the position of FIG.
Lenticular lens array 7a up to position 0 (a)
Is 50 μm, which is the same as the pixel pitch p of the light modulation elements 5a to 5c. As a result, the light emitted from the light modulation elements 5a to 5c is condensed on the object plane 10 of the projection lens at the position shown in FIG. 11A, and returns to the same position as the first field of the first frame. Hereinafter, similarly to the first frame, the gaps in the horizontal direction that are discretely reduced are interpolated to realize a display with high definition.

In this embodiment, one frame is formed by two fields using a lenticular lens array 7a composed of a plurality of lenticular lenses corresponding to two pixel rows of an image synthesized by the color synthesizing means 6. However, a configuration in which one frame is formed in i-fields using a lenticular lens array 7a composed of a plurality of lenticular lenses corresponding to i-pixel columns such as a three-pixel column or a four-pixel column may be employed. At this time, the horizontal movement amount Lh of the lenticular lens array 7a with respect to one field signal by the actuator 8 is an integer multiple of the pixel pitch ph, where ph is the horizontal pixel pitch, and ph ≦ Lh ≦ (i−1). ) × ph.

In this embodiment as well, the same effect can be obtained by moving the projection lens 9 instead of moving the lenticular lens array 7a, but one screen (frame) is divided into a plurality of images (fields). The pixel position on the screen in each image at the time of the above is different from the case where the condensing unit is moved and changed. At this time, any of the lens groups constituting the projection lens 9 may be moved and changed. However, since it is desirable to move and change the lightest lens, generally, the rear lens is moved and changed.

In this embodiment, the lenticular lens array 7a is vibrated in the horizontal direction to obtain a high-definition image. However, the shape of the lenticular lens is changed to obtain a high-definition image in the vertical direction. It doesn't matter. Further, the lenticular lens array 7a
It is also possible to increase the resolution in the horizontal and vertical directions by using two sets of vibration means.

FIG. 12 is a perspective view showing the positional relationship between the light modulation elements 5a to 5c, the lenticular lens array, and the object plane 10 of the projection lens 9 when two sets of the lenticular lens array and the vibrating means are used. In FIG. 12, 7a
Is a first lenticular lens array that focuses light in the horizontal direction, and 7b is a second lenticular lens array that focuses light in the vertical direction. Here, a lenticular lens array having lenticular lenses respectively corresponding to two pixel columns is used. The first and second lenticular lens arrays 7a and 7b have a focus on the object plane 10 of the projection lens so as to converge the light emitted from the light modulation elements 5a to 5c in half in the horizontal / vertical directions. ing. As a result, on the object plane 10 of the projection lens, as in the first embodiment, a state in which the pixels are thinned out in the horizontal and vertical directions in units of four adjacent pixels, that is, a state in which the pixels are discretely reduced is obtained. . By synchronizing the first and second lenticular lens arrays 7a and 7b with the field signal,
First and second lenticular lens arrays 7 respectively
By moving the actuators 8a1, 8a2 and 8b1, 8b2 in the horizontal / vertical directions on the plane orthogonal to the optical axis of the light incident on the light modulation elements a, 7b, the light modulation elements 5a to 5c having (m × n) pixels To realize a high definition display having 4 × (m × n) pixels.

In contrast to the microlens array used in the first embodiment as the light condensing means, the lenticular lens array used in the present embodiment increases the number of components, but uses the shape of the pixel effectively. Advantageously, it is possible to display a high-definition image without lowering the light use efficiency.

[0070]

As described above, according to the present invention, on the optical path from the light modulation element to the screen, the light or color emitted from a plurality of pixels adjacent to the light modulation element for separating an image into a plurality of pixels on the screen. An optical element having a plurality of condensing optical elements each including the light emitted from a plurality of pixels adjacent to the light modulating element synthesized by the synthesizing unit, and an image discretely separated on a screen by the optical element By the projection area changing means for projecting the display image by the light modulation element so as to interpolate, the image is made discrete and time division display is performed so as to interpolate the gap, so that the number of pixels of the light modulation element is not increased. It is possible to increase the definition of the projected display image.

Further, in the present invention, since a microlens array or a lenticular lens array is used as a condensing means as a means for making an image discrete, a light such as a means for blocking light emitted from a light modulation element is used. There is no decrease in the efficiency of use. In addition, since the interpolation of the gap is performed by mechanical vibration by the actuator, light absorption by a polarizing plate or a liquid crystal panel or the like for rotating a polarization direction for shifting an image is provided on an optical path from the light modulation element to the projection means. There is no need to arrange an associated optical system, and a bright and high-definition color image can be displayed with a simple configuration without lowering the light use efficiency.

An actuator such as a piezoelectric element as a vibration means has an amplitude of several tens μm or less and an operating frequency of several tens μm.
A low frequency of several Hz to several hundreds of Hz is sufficient, and the switching time of the movement is 1 ms or less, which has a sufficient responsiveness, so that the contrast of an image is not reduced.

Further, by providing a microlens array corresponding to each color, the distance between the light modulation element and the microlens array can be shortened, and the light emitted from the light modulation element can be transferred to another microlens other than the corresponding microlens. The incident light does not lower the contrast of the image.

Further, the optical component used in the present invention has a simple structure such as a microlens array or lenticular lens array formed on a glass substrate and an actuator such as a piezoelectric element, and has a size (number) equivalent to that of a light modulation element. cm), the projection type color display device of the present invention can be made almost the same size as a conventional display device. Furthermore, even when the number of screen divisions is increased to perform higher-definition image display, the number of parts is increased according to the number of screen divisions as in a conventional display device using a crystal plate and a TN liquid crystal panel. No matter what, the size of the device can be almost the same as a conventional device. Further, the optical components newly used in the present invention can be manufactured with high precision and at low cost, so that the cost of the apparatus hardly changes from the conventional one.

[Brief description of the drawings]

FIG. 1 is a basic configuration diagram of a projection type color display device according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a microlens array of the projection type color display device according to the first embodiment of the present invention.

FIG. 3 is a diagram illustrating color synthesis by a color synthesis unit of the projection type color display device according to the first embodiment of the present invention.

FIG. 4 is a plan view showing a positional relationship between a combined image and a convex lens in the projection type color display device according to the first embodiment of the present invention.

FIG. 5 is a cross-sectional view of a plane parallel to the optical axis from the light modulation element of the projection type color display device according to the first embodiment of the present invention to the object plane of the projection lens, taken along the line AA ′ of FIG. 4; .

FIG. 6 is a plan view showing a positional relationship of an incident light beam on an object plane of a projection lens when one screen of the projection type color display device according to the first embodiment of the present invention is divided into four images.

FIG. 7 is a basic configuration diagram of a projection type color display device according to a second embodiment of the present invention.

FIG. 8 is a cross-sectional view of a plane parallel to an optical axis from a light modulation element of a projection type color display device according to a second embodiment of the present invention to an object plane of a projection lens, taken along the line AA ′ of FIG. 4; .

FIG. 9 is a basic configuration diagram of a projection type color display device according to a second embodiment of the present invention.

FIG. 10 is a perspective view showing a positional relationship among a light modulation element, a lenticular lens array, and an object plane of a projection lens of a projection type color display device according to a second embodiment of the present invention.

FIG. 11 is a plan view showing a positional relationship of an incident light beam on an object plane of a projection lens when one screen of a projection type color display device according to a second embodiment of the present invention is divided into two images.

FIG. 12 illustrates a positional relationship among a light modulation element, a first lenticular lens array, a second lenticular lens array, and an object plane of a projection lens of a projection type color display device according to a second embodiment of the present invention. It is a perspective view.

FIG. 13 is an explanatory diagram showing a configuration of a conventional projection type color display device.

FIG. 14 is an explanatory diagram showing a configuration of a conventional projection display device.

FIG. 15 is an explanatory diagram showing a configuration of an image projected by a conventional projection display device.

FIG. 16 is an explanatory diagram showing a configuration of a conventional projection display device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Light source 2 Collimating conversion lens 3 Color separation means 4 Mirror 5 Light modulation element 6 Color synthesis means 7 Micro lens array (lenticular lens array) 8 Actuator 9 Projection lens 10 Object plane of projection lens 11 Screen

Continued on the front page (72) Inventor Keishi Fujimaga

Claims (6)

[Claims] 1. A color separation means for separating light from a light source into light of a plurality of colors, a plurality of light modulation elements having a plurality of pixels for modulating the lights of the plurality of colors, respectively, A projection type color display device comprising: a color combining unit that combines the plurality of colors of light; and a projection unit that enlarges and projects a color image displayed by the plurality of light modulation elements onto a screen. A collection in which a plurality of condensing optical elements including emission light from a predetermined number of adjacent pixels among the plurality of pixels of the light modulation element in respective apertures are arranged adjacently so that an image is separated into a plurality of pixels. A light means, and a projection area changing means for changing an image projection area on the screen so as to interpolate an image separated on the screen by the light condensing means and projecting an image displayed by the light modulation element. The provided, the projection color display device which is characterized in that the time division display of one frame is composed of a plurality of fields. 2. The projection type color display device according to claim 1, wherein said condensing means and said projection area changing means are located on an optical path from said color synthesizing means to said projecting means. Projection color display device. 3. The projection type color display device according to claim 1, wherein said condensing means and said projection area changing means are provided for each of said light modulating elements, and said light modulating elements are provided to said color synthesizing means. A projection type color display device, wherein the projection type color display devices are located on respective optical paths. 4. The projection type color display device according to claim 1, wherein said light condensing means outputs light from an adjacent (i × j) pixel among a plurality of pixels of said light modulation element. A projection type color display device comprising: a microlens array having a plurality of convex lenses each including a projection light within each aperture. 5. The projection type color display device according to claim 1, wherein said condensing means has a semicircular cross-section corresponding to an adjacent i-line among a plurality of pixels of said light modulation element. A projection type color display device comprising a lenticular lens array having a micro lens. 6. The projection type color display device according to claim 1, wherein said condensing means has a semicircular cross section corresponding to an adjacent i-line among a plurality of pixels of said light modulation element. A projection type comprising: a first lenticular lens array having a microlens; and a second lenticular lens array having a microlens having a semicircular cross section corresponding to a j-line orthogonal to the i-line. Color display device.