JPH07209621A - Projector device - Google Patents

Abstract

PURPOSE: To provide a projector device which is simplified and miniaturized, makes the luminance of a display video high and considerably improves usefulness. CONSTITUTION: Illumination light is made incident on a dichroic prism for color separation 41 at an angle corresponding to the modulation characteristics of the micro mirror elements of three mirror reflection-type optical modulators 43R, 43G and 43B where the plural micro mirror elements are arranged in accordance with the picture elements of video data, and light is separated into red, green and blue light beams. The separated red, green and blue light beams are emitted to the mirror reflection optical modulators 43R, 43G and 43B arranged to face the outgoing faces 43R, 42G and 42B of the prism 41. The respective valid reflected light beams of the mirror reflection optical modulators 43R, 43G and 43B, which correspond to video data, are synthesized and projected on the prism 41.

Description

Detailed Description of the Invention

[0001]

[Table of Contents] The present invention will be described in the following order. Field of Industrial Application Conventional Technology Problem to be Solved by the Invention Means for Solving the Problem Action Example (1) Overall configuration of projector device (FIGS. 1 to 5) (2) Projector device of example (FIG. 6 to FIG. 19) (3) Other Examples Effects of the Invention

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projector device, and is suitable for application to, for example, a device for projecting a color image.

[0003]

2. Description of the Related Art Conventionally, as a projector device of this type, there is a projector device which individually displays red, green and blue components of image data on three CRTs (cathode ray tubes).
On the front surface of this projection type three-tube projector device, three CRTs in which red, green, and blue color filters and projection lenses are sequentially arranged on the image projection surface side are arranged.

The CRT is designed so that the red, green and blue components of the image data are directly projected onto the screen separately at the time of projection, whereby the projected light of the red, green and blue components projected from each CRT on the screen is projected. One image is formed by combining them, and a color image is projected as a whole.

Further, instead of the projection type three-tube type projector device, there is a reflection type three-tube type projector device in which three CRTs are arranged inside the box. In the case of this projector device, an optical path similar to that of the projection-type three-tube projector device is reflected and bent by a mirror arranged inside the box, and projection light is irradiated from the back surface to a frosted glass-like semitransparent screen.

As a result, each CR is displayed on the screen.
The projection lights of the red, green, and blue components emitted from T are combined to form one image, and a color image is projected as a whole. In the case of this reflection type three-tube type projector device, by bending the optical path to reduce the size and integrally forming the screen itself, it is possible to realize a smaller size projector device than the projection type three-tube type projector device. The usability of can be improved.

[0007]

However, in the projection type three-tube projector device or the reflection type three-tube projector device having such a configuration, a CRT is used as a light source and an image projected from the CRT is enlarged and displayed on the screen. Therefore, there is a problem in that it is inevitable that the entire device becomes large, and it is difficult to increase the brightness of the display image.

In order to solve such a problem, three liquid crystal panel plates are used as an image source in place of the CRT, each of the liquid crystal panel plates displays red, green and blue components, and one surface of the liquid crystal panel plate is displayed. There is a so-called liquid crystal projector device which irradiates light from the side and forms an image of the transmitted light on a screen through red, green and blue color filters, respectively.

In the case of this liquid crystal projector device, the entire device can be remarkably miniaturized as compared with a projector device which uses a CRT because a liquid crystal panel is used, but the liquid crystal panel plate itself has a low light transmittance and displays a display image. In terms of achieving high brightness, it has not been practically sufficient.

By the way, as a display system, minute mirror surface elements are arranged in a plane according to pixels, and a specular reflection type optical modulator utilizing the reflection of each mirror surface element (hereinafter referred to as a mirror light valve) is used. Those have been proposed (JP-A-60-179781, JP-A-3-40693, and JP-A-3-174112).

If a projector device for magnifying and projecting a color image can be formed by using this mirror light valve as an image source, the structure of the entire device can be simplified to the same scale as the liquid crystal projector device and can be downsized.
Further, it is considered that the display image can be significantly increased in brightness by improving the utilization efficiency of the light source as compared with the liquid crystal.

The present invention has been made in view of the above points, and it is an object of the present invention to propose a projector device which can be simply and miniaturized and which can enhance the brightness of a displayed image and remarkably improve its usefulness.

[0013]

In order to solve such a problem, in the present invention, three specular reflection type optical modulators 4 in which a plurality of minute specular surface elements are arranged in accordance with pixels of image data are provided.
The 3R, 43G, and 43B are irradiated with the illumination light separated into red, green, and blue, and each specular reflection type light modulator 4
3R, 43G, 43B are modulated according to the red, green, and blue components of the image data, and the effective reflection light of each specular reflection type optical modulator 43R, 43G, 43B corresponding to the image data is combined to form an image display surface. In the projector device 40 for displaying a desired image on the screen, the color separation dichroic prism 4
The respective specular reflection type optical modulators 43R, 43G, 4 so as to face the emission surfaces 42R, 42G, 42B corresponding to the respective colors of 1.
3B is arranged, and the illumination light is made incident from the light source so as to be offset by a predetermined angle with respect to the vertical direction of the incident surface 45 of the dichroic prism 41, and each specular reflection type optical modulator 43.
The effective reflected lights corresponding to the image data reflected by R, 43G, and 43B are color-synthesized by the dichroic prism 41 and projected.

[0014]

Operation: Three specular reflection type optical modulators 43R, 43 in which a plurality of microscopic mirror elements are arranged according to pixels of image data
At an angle according to the modulation characteristics of the G and 43B micro mirror elements,
The illumination light is made incident on the color separation dichroic prism 41 and separated into red, green and blue lights. Red, isolated
The green and blue light is emitted from the exit surfaces 42R and 42R of the prism 41.
G, 42B is emitted to the specular reflection type optical modulators 43R, 43G, 43B arranged so as to face each other, and the effective reflection light of each of the specular reflection type optical modulators 43R, 43G, 43B according to the image data is converted into the prism 41. To synthesize and project. As a result, the entire structure of the projector device can be greatly simplified and downsized, and the utilization efficiency of the light source can be improved as compared with the liquid crystal, so that the display image can be significantly brightened.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

(1) Overall Configuration of Projector Device In FIG. 1, reference numeral 1 indicates three mirror light valves 2 corresponding to respective image data of red, green and blue as a whole.
1 shows a projector device using R, 2G, 2B. 2 and 3 in which parts corresponding to those in FIG.
As shown in FIG. 3, the projection light L1 emitted from the high-intensity white light source 3 is converted into parallel light through a condenser lens 4 while unnecessary UV rays are removed by a UV filter (not shown). The dichroic mirrors 6R and 6 for separation while being bent by the reflection mirror 5 of No. 1
It is incident on G and 6B.

Separation dichroic mirrors 6R, 6G,
6B is a procession light L2 consisting of white light in red,
The green and blue lights LR, LG and LB are separated. This red,
The green and blue lights LR, LG, LB are obliquely bent upward by the second reflecting mirrors 8R, 8G, 8B through the beam shaping cylindrical lenses 7R, 7G, 7B, respectively, and reflected by the mirror light valves 2R, 2G, 2B. The surface is illuminated.

The mirror light valves 2R, 2G and 2B are
According to the pixel array of video data (for example, 768 x 576 pixels), a plurality of minute mirror surface elements each having a size of, for example, 17 [μm] square are arrayed, and thereby, a half
A reflective surface having a size similar to that of an inch CCD (solid-state image sensor) is formed. The micro mirror surface element is arranged corresponding to each memory cell of the frame memory according to the array of pixels of the video data, and the tilt state of the corresponding micro mirror surface element is changed individually according to the state of each memory cell. Has been done.

Practically, each micro mirror element tilts by + 10 ° as shown in FIG. 4 (A) when the memory cell is in the on state, that is, effective as a pixel with respect to the neutral state, and conversely, when the memory cell is in the off state, When it is invalid as a pixel, it is tilted by −10 ° as shown in FIG.
As a result, the reflected light reflected by the mirror surface with respect to the incident light is
It is switched to have an optical path difference of 20 ° between the effective reflected light necessary for forming an image and the invalid reflected light which is not effective.

In the case of this projector device 1, the image data for one frame of red, green, and blue is set in the frame memories corresponding to the mirror light valves 2R, 2G, and 2B, respectively, so that the effective reflected light is obtained. Red,
Green and blue image lights are formed. The red, green and blue image lights are respectively associated with relay lenses 9R, 9G and 9B.
Through dichroic mirrors for synthesis 10R, 10G,
It is guided to 10B and is combined as a color image light, and this is enlarged and projected through a projection lens 11 having a zoom lens structure onto a screen (not shown) arranged outside the projector device 1 at a distance.

In the case of the projector device 1, the high-brightness white light source 3, the condenser lens 4, the first reflecting mirror 5, the separating dichroic mirrors 6R to 6B, and the cylindrical lenses 7R to 7B are passed through the second reflecting mirror 8R. ~
The optical axis of the optical system of the projection lights L1 and L2 reaching 8B, the relay lenses 9R to 9B reflected by the mirror light valves 2R to 2B, and the dichroic mirror for synthesis 10R.
˜10B, the optical axis of the effective reflected light reaching the projection lens 11 is displaced by a predetermined height, thereby preventing interference between the projection light and the effective reflected light and the invalid reflected light. It is designed to get you.

Furthermore, in the projector device 1, the beam shape of the projection light is shaped by the cylindrical lenses 7R to 7B, whereby the second reflecting mirror 8 is formed.
Even if the light is reflected obliquely upward by R to 8B, the reflecting surfaces of the mirror light valves 2R to 2B can be illuminated with a uniform illuminance.

Here, in the projector device 1, the optical device shown in FIG.
The circuit portion shown in FIG. 5 in which the same reference numerals are assigned to the corresponding portions is provided. In this projector device 1, as a video signal to be displayed, a video signal S1 input as an RGB signal from a video device or a V signal from a personal computer or the like is used.
The video signal S2 sent corresponding to GA (video graphics arrey) and the video signal S3 of VGA pattern can be selected.

These video signals S1, S2, S3 are
Each of them is input to the video select circuit 21 and selected, and the resulting video signal S4 is converted into a digital video signal S5 by the analog-digital conversion circuit 22,
It is input to the gamma correction circuit 23. The test pattern signal S6 generated by the test pattern generation circuit 24 is input to the gamma correction circuit 23 as needed. As a result, the gamma correction circuit 23 performs gamma correction on the digital video signal S5 or the test pattern signal S6 according to the set gamma correction parameter S7, and sends the resulting digital video signal S8 to the reformatting circuit 25.

The re-format circuit 25 inputs the RGB video signal S1 and the VGA video signals S2 and S.
The digital video signal S8 corresponding to 3 is, for example, mirror light valves 2R to 2B composed of 768 pixels × 576 lines.
The digital video signal S9 of red, green, and blue components obtained by performing re-formatting according to the arrangement of the mirror surface elements
R, S9B and S9G are sent to the corresponding frame memories 26R, 26G and 26B, respectively.

The frame memories 26R to 26B correspond to the mirror light valves 2R to 2B, respectively, and in accordance with the control signal S10 input from the timing control circuit 27, the frame memories 26R to 2 are sequentially frame by frame.
The contents of 6B are written in the mirror light valves 2R to 2B, whereby red, green and blue image lights are formed as effective reflected lights.

In the case of this projector device 1, the timing control circuit 27 uses the input video signals S1 to S3.
Using the system clock S12 generated by the clock generation circuit 28 in accordance with the phase control signal S11 based on the above, the frame memories 26R to 26B and the mirror light valve 2R are used.
The control signal S10 for controlling .about.2B is generated.

Further, in the projector device 1, when the power switch (not shown) is turned on, the AC power S13 is supplied to the power supply circuit 30 and the lamp drive circuit 31. Of these, the power supply circuit 30 supplies a predetermined DC power S14 to each circuit section to start the operation of the projector device 1. Further, the lamp drive circuit 31 drives the high-intensity white light source 3 to be turned on, so that the white light source 3 emits the projection light L1.

According to the configuration of the projector device 1,
Mirror light valves 2R, 2G, and 2B corresponding to red, green, and blue are used as image sources, and the mirror light valves 2R to 2B are driven by red, green, and blue video signals, respectively, and white light is emitted. By irradiating red, green, and blue projection lights separated by color, and synthesizing the effective reflected light, and enlarging and projecting, compared with the conventional projector using a CRT. Projector device 1 with significantly smaller size, lighter weight and simple structure
Can be realized.

Further, since the mirror light valves 2R-2B are designed to reflect the projection light,
As compared with the liquid crystal projector device, the utilization efficiency of light can be remarkably improved, and thus it is possible to realize the projector device which can be reduced in size and weight and which can increase the brightness of the displayed image.

(2) Projector device of the embodiment In FIG. 6, 40 is a dichroic prism 41 (4) for three-color separation used in a three-tube color camera as a whole.
1R, 41G, 41B) is a plan view of a projector device, in which illumination light incident at a predetermined incident angle is separated into red, green and blue lights by a dichroic prism 41, and each color of the dichroic prism 41 is supported. The light is reflected by the mirror light valves 43R, 43G, and 43B arranged so as to face the emission surfaces 42R, 42G, and 42B.
The effective reflected lights corresponding to the reflected image data are color-synthesized by the dichroic prism 41 and enlarged and projected on a screen (not shown) through the projection lens 44.

The illumination light incident on the prism 41 is incident so as to be offset by an angle corresponding to the modulation characteristic of the mirror light valve 43 with respect to the vertical direction of the incident surface 45 of the prism 41. In this embodiment, as shown in FIG. 7 (side view of the projector device 40), the illumination light emitted from the high-intensity white light source 46 is 20 ° from below with respect to the vertical direction of the incident surface 45 of the prism 41. The light is reflected by the mirror 47 so that it is incident at an incident angle.

As shown in FIG. 6, the dichroic prism 41 is composed of three prisms 41R, 41G and 41B. A multilayer film is vapor-deposited on the face 49. In the case of this embodiment, a film that transmits only red component light and green component light is formed on the dichroic surface 48, and a film that transmits only green component light is formed on the dichroic surface 49. Therefore, when the illumination light is incident on the prism 41 from the light source 46 through the incident surface 45, only the blue component light is reflected by the dichroic surface 48 as shown in FIG. 8A (bottom view of the projector device 40). The red component light is emitted to the mirror light valve 43B, only the red component light is reflected on the dichroic surface 49 to be applied to the mirror light valve 43R, and the green component light is transmitted through the dichroic surface 49 and incident on the mirror light valve 43G. Has been done.

The dichroic prism 41 has an exit surface 42 of the red component light, the blue component light and the green component light reflected by the mirror light valves 43R, 43G and 43B.
The green component light and the red component light reflected by G and 42R are combined on the dichroic surface 49, and the two-color component light and the red component light reflected by the emission surface 42R are combined into the dichroic surface 4
It is configured to be combined in 8 and to be emitted to the projection lens 44.

Mirror light valves 43R, 43G, 43
B is a pixel array of video data (eg, 768 × 5)
The number of micromirror elements is about 17 [μm] square, for example.
A reflecting surface having a size similar to that of a 1/2 inch CCD (solid-state image sensor) is formed. The micro mirror surface element is arranged corresponding to each memory cell of the frame memory according to the array of pixels of the video data, and the tilt state of the corresponding micro mirror surface element is changed individually according to the state of each memory cell. Has been done.

Practically, each micro mirror element tilts to + 10 ° with respect to the neutral state when the memory cell is in the ON state, that is, effective as a pixel, and conversely, when the memory cell is in the OFF state, that is, ineffective as the pixel, −10. ° It is designed to tilt. As a result, the reflected light reflected by the mirror surface with respect to the incident light is switched so as to have an optical path difference of 20 ° between the effective reflected light necessary for forming an image and the invalid reflected light that is ineffective. Here, the incident angle of the illumination light incident on the prism 41 is 20
The angle of incidence of 20 ° is the tilt angle of the mirror element. Therefore, the incident angle at which the illumination light enters the prism 41 depends on the modulation characteristic of the mirror surface element.

In the case of this projector device 40, the image data for one frame of red, green, and blue is set in the frame memories corresponding to the mirror light valves 43R, 43G, and 43B, respectively, so that the effective reflected light is obtained. Red, green, and blue image lights are formed. Therefore, in the mirror light valve 43R, only the mirror surface element corresponding to the pixel of the red component is turned on and red light is emitted, and in the mirror light valve 43G, only the mirror surface element corresponding to the pixel of the green component is turned on. In the meantime, green light is emitted, and in the mirror light valve 43B, only the mirror surface element corresponding to the pixel of the blue component is turned on and blue light is emitted. The projection lens 44 has a zoom lens configuration, and magnifies the red, green, and blue image light combined by the prism 41 and projects the magnified image light on a screen disposed outside the projector 40.

In the above structure, the high brightness white light source 46
The emitted illumination light is reflected by the mirror 47 and is incident on the prism 41 at an incident angle of 20 ° from below with respect to the vertical direction of the incident surface 45 of the dichroic prism 41.
As shown in (A), first, only the blue component light LB is reflected by the dichroic surface 48. The blue light LB reflected by the dichroic surface 48 is reflected by the incident surface 45 of the prism 41 and then enters the mirror light valve 43B. The dichroic surface 49 reflects only the red component light LR of the illumination light excluding the blue light LB that has passed through the dichroic surface 48. The red light LR reflected by the dichroic surface 49 is reflected by the dichroic surface 48 and then reflected by the mirror light valve 4.
It is incident on 3R. The green component light LG transmitted through the dichroic surface 49 enters the mirror light valve 43G as it is.

Here, in FIG. 8A, the position where the irradiation light is incident on the prism 41 is unnatural, but this is written for convenience of explanation, and the actual incident position of the irradiation light is as described above. Is the street. Further, in FIGS. 7 to 9, the irradiation light is shown as being divided into three and incident on the prism 41, but this is also shown as being divided into three lights for the sake of convenience of description, and in fact, as described above. After being incident on the prism 41, the light is split into red, green, and blue light. Further, the same applies to the projection light projected from the prism 41, and is actually combined by the prism 41 and projected onto the projection lens 44 as described above.

Mirror light valves 43R, 43G, 4
In 3B, the mirror light elements corresponding to the incident red, green, and blue component pixels are turned on, and the mirror light valve 43 is turned on.
R, 43G, 43B output surfaces 42R, 42G, 42B
More red, green, and blue lights are emitted, and the dichroic surface 49 combines the green light and the red light. Then, the dichroic surface 48 combines the two color component lights and the blue light, and the projection lens 44 Is emitted to. The projection lens 44 magnifies this image light and magnifies and projects it on the screen.

According to the above construction, the irradiation light is separated into red, green and blue lights by using the dichroic prism 41 and reflected by the mirror light valves 43R, 43G and 43B, and each effective reflected light is dichroic. By combining with the optical prism 41, the number of optical components can be remarkably reduced, so that the overall structure of the projector device can be simplified and downsized, and the light source utilization efficiency is improved as compared with liquid crystal. Therefore, it is possible to significantly increase the brightness of the displayed image.

Incidentally, a liquid crystal reflection type projector device 60 using a liquid crystal panel plate can be considered as shown in FIG. In this projector device 60, a reflection type liquid crystal light modulation element 61 (61R, 61G, 61B) is used instead of the mirror light valve 43.
To use. That is, as shown in FIG. 10, the illumination light emitted from the light source is a polarized beam splitter (PBS) 63 that reflects and transmits the unnecessary ultraviolet rays and infrared rays by the IR-UV cut filter 62, and then transmits the reflected light according to the polarization direction of the light. The light is reflected and enters the dichroic prism 41. The incident light is separated into red, green, and blue lights by the dichroic surfaces 48 and 49 in the prism 41, and then undergoes light modulation and polarization axis conversion by the reflective liquid crystal light modulation elements 61R, 61G, and 61B, and the prism 41 Combined and emitted to PBS62,
The light is transmitted through the PBS 62 and is enlarged and projected on a screen (not shown) through the projection lens 44.

In the structure of the projector device 60, unlike the optical paths of the incident light and the reflected light of the projector device 40 according to the present invention, since the incident light and the reflected light are on the same axis (FIG. 9), the polarized beam splitter 62 is provided. Must be used to split the incident and reflected light. For this reason, the light utilization efficiency is halved, the amount of light is reduced, and it is necessary to adjust the optical axis. Further, since the PBS 62 is used, a mechanism for fixing the PBS 62 is also required, and the number of parts is increased, so that the structure of the entire device becomes more complicated than that of the projector device 40 in the embodiment of the present invention. Furthermore, since the incident light split by the prism 41 is reflected by the reflective liquid crystal light modulation element 61, the light utilization efficiency is further reduced.

In contrast, in the projector device 40 according to the embodiment of the present invention, as shown in FIG. 8B (side view of the projector device 40), the incident surface 4 of the prism 41 is
The illuminating light is incident on the prism 4 from below at an angle of 20 °.
Since the light paths of the incident light and the reflected light are made different by making the light incident on No. 1, it is not necessary to split the light. Therefore, PBS6
Since it is not necessary to provide 2 or adjust the optical axis for this purpose, the configuration is simpler and smaller than the projector device 60. Further, since the incident light split by the prism 41 is reflected by the mirror light valve 41 to significantly improve the light utilization efficiency, it is possible to further increase the brightness of the displayed image.

(3) Other Embodiments In the above embodiment, the specular reflection type optical modulator is used as a specular reflection type light modulator according to the arrangement of the pixels of the image data.
The case where an array of 768 × 576 micro mirror surface elements is used has been described, but the array of micro mirror surface elements is not limited to this, and various selections may be made. Even when microscopic mirror elements are arranged one-dimensionally and an image is formed by scanning the projection light, the same effect as that of the above-described embodiment can be realized.

In the above embodiment, the specular reflection type optical modulators driven according to the red, green and blue images are irradiated with the red, green and blue projection light, respectively, and their effective reflection is performed. Although the case where the light is combined and displayed in an enlarged manner has been described, instead of this, a single specular reflection type optical modulator is sequentially driven in a time-division manner according to red, green and blue images,
A projector that combines red, green, and blue projection light in a time-division sequence in synchronism with this, or a combination of a specular reflection light modulator that projects images of two or more colors. Even when applied to a device or the like, the same effect as that of the above-described embodiment can be realized.

Further, in the above-mentioned embodiment, the case where the irradiation light is incident on the incident surface 45 of the prism 41 from the lower side at an incident angle of 20 ° has been described. The incident surface 45 of the prism 41 may be incident at an incident angle of 20 ° from above.

In the above embodiment, the case where the irradiation light is incident on the incident surface 45 of the prism 41 at an incident angle of 20 ° has been described, but the present invention is not limited to this, and the mirror light valve 42 is not limited thereto. The prism 41 may be incident at another inclination angle as long as it is an angle according to the modulation characteristic.

[0049]

As described above, according to the present invention, the angle corresponding to the modulation characteristics of the micro mirror surface elements of the three specular reflection type optical modulators in which the plurality of micro mirror surface elements are arranged according to the pixels of the video data. In this way, the illumination light is made incident on the dichroic prism for color separation and separated into red, green, and blue lights, and the separated red, green, and blue lights are specularly reflected so as to face the exit surface of the prism. Type, and the effective reflected light of each specular reflection type optical modulator corresponding to the image data is combined by a prism and projected, so that the overall configuration of the projector device can be greatly simplified and downsized. In addition, since the light source can be used more efficiently and the light source can be used more efficiently than the liquid crystal, the display image can be significantly increased in brightness.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing the overall configuration of a projector device using a specular reflection type optical modulator.

FIG. 2 is a schematic plan view for explaining an optical system of the projector device of FIG.

3 is a schematic rear view for explaining an optical system of the projector device of FIG. 1. FIG.

FIG. 4 is a schematic diagram for explaining the operation of a specular element of a specular reflection type optical modulator.

5 is a block diagram showing a circuit configuration of the projector device of FIG. 1. FIG.

FIG. 6 is a schematic plan view showing the configuration of the projector device of the embodiment.

FIG. 7 is a schematic side view showing the configuration of the projector device of the embodiment.

FIG. 8 is a schematic diagram showing optical paths of incident light and emitted light in the projector device of the example.

FIG. 9 is a schematic diagram showing optical paths of incident light and emitted light in a conventional projector device.

[Explanation of reference numerals] 1, 40, 60 ... Projector device, 2, 43 ... Mirror light valve, 3, 46 ... High-intensity white light source, 4 ...
… Condenser lens, 5 …… First reflective mirror, 6 ……
Separation dichroic mirror, 7 ... Cylindrical lens for beam shaping, 8 ... Second reflection mirror, 9 ... Relay lens, 10 ... Synthesis dichroic mirror, 1
1 ... Projection lens, 21 ... Video select circuit, 22 ... Analog-digital conversion circuit, 23 ...
Gamma correction circuit, 24 ... Test pattern generation circuit, 2
5: Ref-format circuit, 26: Frame memory,
27 ... Timing control circuit, 28 ... Clock generation circuit, 30 ... Power supply circuit, 31 ... Lamp drive circuit,
41 …… dichroic prism, 42 …… exit surface, 4
4 ... Projection lens, 45 ... Incident surface, 47 ... Mirror,
48, 49 ... Dyloquit surface, 61 ... Reflective liquid crystal light modulation element, 62 ... UV-IR cut filter, 63
…… Deflection beam splitter.

 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Tsuneo Yamazaki 6-735 Kitashinagawa, Shinagawa-ku, Tokyo Sony Corporation (72) Masato Hatanaka Nakagawa 6-35, Shinagawa-ku, Tokyo Sony Corporation

Claims (2)

[Claims] Claim: What is claimed is: 1. Three specular reflection type optical modulators, each having a plurality of minute specular surface elements arranged in accordance with pixels of image data, are provided with red,
The illumination light separated into green and blue is emitted, and the respective specular reflection type light modulators are modulated according to the red, green and blue components of the image data, and the respective specular reflection type according to the image data. In a projector device that synthesizes the effective reflected light of the optical modulator and displays the desired image on the image display surface, the specular reflection type light described above is placed so as to face the emission surface corresponding to each color of the color separation dichroic prism. With a modulator,
Illumination light is made incident from the light source so as to be offset by a predetermined angle with respect to the vertical direction of the incident surface of the dichroic prism, and the effective reflections corresponding to the image data reflected by the specular reflection type light modulators. A projector device characterized in that light is color-synthesized and projected by the dichroic prism. 2. The predetermined angle is an angle according to the modulation characteristic of the specular reflection type optical modulator.
The projector device described in 1.