JPH09171165A - Projection type image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection image of high picture quality by suppressing color slippage in a projection type image display device by means of a single plate image display device. SOLUTION: This device makes a set of independently controllable three pixels according to blue, green and red color signals by means of a signal from outside and is composed of an illuminating optical system composed of a liquid crystal panel 3 provided with these many pixels, a projection lens 16, a light source 1 and a reflection mirror 2. Two reflection surfaces (a first surface 14, a second surface 15) are provided between the liquid crystal panel 3 and the projection lens 16 so as to be oblique to the optical axis connecting the liquid crystal panel 3 to the projection lens 16 and further in parallel to each other, the spectroscopic characteristics of the reflection surface on the side of the liquid crystal panel 3 is made to be different from that of the other surface and the light beams are made incident on the projection lens 16 while the optical axis is deviated by color.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light valve type projection-type image display device which obtains a projected image by controlling light from a light source, and in particular, one image display device has three colors of blue, green and red. The present invention relates to an image display device that can obtain a color image by controlling a projected image.

[0002]

2. Description of the Related Art A projection image display apparatus using a liquid crystal panel has been increasingly accepted in the market in place of a conventional projection image display apparatus using a CRT in terms of small size, light weight, ease of installation, and price. Projection type image display devices using this liquid crystal panel can be roughly classified into two types. One of them is a single plate type in which a color image is obtained by performing wavelength selection using a color filter corresponding to each pixel on one liquid crystal panel. The other is a three-plate type that obtains a color image by selecting the wavelength of blue, green, and red in advance from the light from the light source with a dichroic mirror and transmitting the light to a liquid crystal panel that displays an image corresponding to each color. is there.

Since the former can provide inexpensive and small-sized products, this method is superior in the number of vehicles currently on the market. However, since color display is performed by the color filter, R, G, and B are always separated, and when the observer observes at a distance where it can be determined that the R, G, and B displays are separated, the image quality is Damages. Furthermore, R, G,
When only one of the colors B is displayed, the other two colors are displayed in black, so that black lines are formed on the screen and the image quality is greatly impaired. In the latter case, since images of three colors can be displayed in the same position by using a dichroic mirror, there is no deterioration in image quality due to color shift even when viewed from a short distance. For the same reason, even when displaying only one of R, G, and B colors, the black portion does not occur, so that high image quality can be maintained. However, since the structure of the device is complicated, the device is larger than the former, and the device is expensive, it is difficult to use for home use.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide a light valve type projection image display device which is compact and realizes high image quality. It is what

[0005]

In order to solve this problem, the present invention provides a first color signal and a second color signal by an external signal.
3 which can be controlled independently according to the color signal and the third color signal
An image display device including a plurality of pixels each including one pixel, a projection lens arranged so as to magnify and project an image on the image display device, and an image projected on the projection lens after being modulated by the image display device. And an optical axis that connects the image display device and the projection lens with two reflecting surfaces between the image display device and the projection lens. They are provided obliquely with respect to each other and parallel to each other. Of these, the reflection surface on the image display device side (hereinafter referred to as the first reflection surface) reflects the first color and reflects the second color and the third color. The other has a characteristic of transmitting a color, and the other (hereinafter referred to as a second reflecting surface) has at least a second color,
An optical axis having a characteristic of reflecting a third color, and connecting the image display device and the projection lens when the pixel pitch of the set of three pixels of the image display device is arranged as p. The light of the first color reflected by the first reflecting surface and the light that has passed through the first reflecting surface
Reflected by the reflective surface of No. 2 and again transmitted through the first reflective surface,
The light of the third color is deviated by 1.5 × p, and the two reflecting surfaces are provided so that the first image is formed substantially at the center of the images of the second and third colors in the image projected by the projection lens. The summary is what has been done.

With this configuration, the light emitted from the illumination optical system is modulated by three pixels that can be independently controlled according to the first color signal, the second color signal, and the third color signal of the image display device, During this time, the light passing through the pixels of the first, second, and third color signals is limited to the wavelength of each color. Of the light modulated by the image display device, the light of the first wavelength is guided to the projection lens by the first reflecting surface and projected on the screen. The light of the second and third wavelengths is transmitted through the first reflection surface, then is reflected by the second reflection surface, is transmitted again through the first reflection surface, is guided to the projection lens, and is projected on the screen. . At this time, the image of the second color is displayed on the screen with a displacement of 1.5 times the pixel pitch with respect to the image of the first color, so that the image of the second color is overlapped by half of the pixel and the image of the third color is displayed. Image is also displayed with a shift of 1.5 times the pixel pitch, so that half the pixels are displayed on the opposite side of the image of the first color from the image of the second color. It is possible to improve the image quality deterioration due to the deviation of the images of the second and third colors.

Further, according to the present invention, a first aspect is provided by a signal from the outside.
An image display device including a large number of three pixels that can be independently controlled according to the color signal, the second color signal, and the third color signal, and an image of the image display device. The image display device includes a projection lens arranged to be capable of magnifying and projecting, an illumination optical system including at least a light source and a reflector provided so as to collect light on the projection lens after being modulated by the image display device. And two projection surfaces are provided between the projection lens and the projection lens at an angle to the optical axis connecting the image display device and the projection lens, and in parallel to each other.
Of these, the reflection surface on the image display device side (hereinafter referred to as the first reflection surface) has a characteristic of reflecting the first and second colors and transmitting the third color, and the other (hereinafter referred to as the second reflection surface). ) Is at least the third
Of the image display device, and when the pitch of the pixels of the set of three pixels of the image display device is arranged as p, along the optical axis connecting the image display device and the projection lens. Of the light incident on the first reflection surface, the light of the first and second colors reflected by the first reflection surface, the light reflected by the first reflection surface, reflected by the second reflection surface, and again reflected by the first reflection surface. 3rd penetrated
The light of the color is shifted by 1.5 × p, and the two reflecting surfaces are provided so that the third image is formed at approximately the center of the images of the first and second colors in the image projected by the projection lens. That is the main point.

With this configuration, the light emitted from the illumination optical system is modulated by the three pixels that can be independently controlled according to the first color signal, the second color signal, and the third color signal of the image display device. During this time, the light passing through the pixels of the first, second, and third color signals is limited to the wavelength of each color. Of the light transmitted through the image display device, the light of the first and second wavelengths is guided to the projection lens by the first reflecting surface and projected on the screen. The light of the third wavelength passes through the first reflecting surface, is then reflected by the second reflecting surface, passes through the first reflecting surface again, is guided to the projection lens, and is projected on the screen.
At this time, the image of the third color is displayed on the screen with a displacement of 1.5 times the pixel pitch from the image of the first and second colors, so that the center of the image of the first and second colors is displayed. Since the first and second images are overlapped with each other by half the pixel, the deterioration of the image quality due to the deviation of the images of the first, second and third colors can be improved. .

Further, according to the present invention, a set of three pixels which can be independently controlled according to the first color signal, the second color signal and the third color signal by a signal from the outside is provided as a set, and a large number of them are provided. An image display device provided, a projection lens arranged to be able to magnify and project an image of the image display device, and at least a light source provided so that light is condensed on the projection lens after being modulated by the image display device. , An illumination optical system including a reflector, and 3 between the image display device and the projection lens.
Two reflecting surfaces are provided obliquely to the optical axis connecting the image display device and the projection lens and parallel to each other. Among these, the reflecting surface closest to the image display device (hereinafter referred to as the first reflecting surface) is It has the property of reflecting the first color and transmitting the second color and the third color, and the next reflecting surface (hereinafter, the second reflecting surface) reflects the second color and reflects the third color. The remaining reflective surface (hereinafter referred to as the third reflective surface) has a property of transmitting, and has a property of reflecting at least a third color, and the pixel pitch of the group of the three pixels of the image display device is Of the light incident along the optical axis connecting the transmissive image display device and the projection lens when arranged as p, the first color light and the first reflection reflected by the first reflecting surface The light of the second color, the light of the second color that is transmitted through the surface, is reflected by the second reflective surface, and is transmitted through the first reflective surface again. The light of the third color transmitted through the first and second reflection surfaces, reflected by the third reflection surface, and again transmitted through the first and second reflection surfaces is deviated by p and is reflected by the projection image by the projection lens. The gist is that the three reflecting surfaces are provided so that the images of the first, second, and third colors substantially overlap.

With this configuration, the light emitted from the illumination optical system is modulated by three pixels that can be independently controlled according to the first color signal, the second color signal, and the third color signal of the image display device. During this time, the light passing through the pixels of the first, second, and third color signals is limited to the wavelength of each color. Of the light transmitted through the image display device, the light having the first wavelength is guided to the projection lens by the first reflecting surface and projected on the screen. The light of the second wavelength passes through the first reflecting surface, is then reflected by the second reflecting surface, passes through the first reflecting surface again, is guided to the projection lens, and is projected on the screen. The light of the third wavelength passes through the first and second reflecting surfaces, is then reflected by the third reflecting surface, passes through the second and first reflecting surfaces again, is guided to the projection lens, and is projected on the screen. To be done. At this time, the image of the second color is displayed on the screen with a shift of the pixel pitch from the image of the first color and overlaps. Further, the image of the third color deviates from the image of the first color by twice the pixel pitch and overlaps with the first image. Therefore, it is possible to provide a good image in which the three colors are completely overlapped on the screen and there is no color shift.

Therefore, according to the present invention, the image display device is
Even with a single-sheet configuration, it is possible to provide a good image with little or no color shift. In addition, by having a diffraction grating together in the above configuration, the first, second, and
It is possible to further improve the image quality by reducing or eliminating the black display portion formed between the third pixels.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. First, based on FIG.
An embodiment will be described. In the figure, 1 is a light source, and the light emitted from this light source 1 is controlled in one direction by a reflecting mirror 2. This light is incident on the incident side polarization plate 5 provided on the incident side glass 4 of the liquid crystal panel 3.
The light transmitted through the incident side polarization plate 5 receives the incident side glass 4 and the ITO.
After passing through the film 6, the liquid crystal layer 7, and the ITO film 8, the light passes through the color filter 9. The portion 10a corresponding to the pixel driven according to the green color signal of the color filter 9 has a characteristic of transmitting only green light, and the portion 10b corresponding to the pixel driven according to the red color signal is Has a characteristic of transmitting only red light, and has a characteristic of transmitting only blue light to a portion 10c corresponding to a pixel driven according to a blue color signal. The light transmitted through the color filter 9 is emitted from the exit side glass 11,
The light is transmitted through the emission side polarization plate 12 and is incident on the reflection plate 13 which is arranged obliquely with respect to the optical axis so that the light is incident at an incident angle θ. The reflecting plate 13 is a plane-parallel plate made of a transparent material. The first surface 14 on the light incident side has a characteristic of reflecting only green light of visible light, and the second surface 15 on the other surface. Has the property of reflecting the red and blue lights of visible light. That is, of the light incident on the reflection plate 13, the green light is the first surface 14,
The red and blue light transmits through the first surface 14, then through the reflection plate 13 and is reflected by the second surface 15, and again through the reflection plate 13 and the first surface.
The light is transmitted through 14 and guided to the projection lens 16, whereby the image on the liquid crystal panel 3 is enlarged and projected on the screen 17.

FIG. 2 is a view showing the arrangement of colors when the liquid crystal panel 3 is viewed from the emission side. Further, as described above, the green light is reflected by the first surface 14 and the red and blue lights are reflected by the second surface 15, so that when viewed from the projection lens 16, the color displayed on the liquid crystal panel 3 is displayed. Is displaced, and as a result, the projected image is
As shown in FIG. 3, the red image and the blue image are overlapped with each other by half a pixel centered on the green image. That is, the incident angle θ with respect to the reflection plate 13, the refractive index of the material of the reflection plate 13, the plate thickness of blue, and the image of red are shifted to the green image side by 1.5 times the pixel pitch p. Indicates that it is set.

As described above, according to the present embodiment, the color shift of the projected image can be reduced to about half in the projection type image display apparatus using a single plate, so that the image quality can be greatly improved. In the present embodiment, the green light is on the first surface 14 and the red and blue lights are on the second surface 14.
The reflection on the surface 15 is set, but the present invention is not limited to this. The color reflected on the second surface 15 is 1 trio on the liquid crystal panel 3 (one set of R, G, B on the liquid crystal panel). ), Adjacent colors can be similarly configured. Further, in determining the color of each pixel, a color filter is used in the present embodiment, but it is not restricted to this, and color determination is performed by allowing pre-color-separated light to enter a predetermined position. The means for is not limited. The image display means is also a liquid crystal panel here, but is not limited to this.

In the present embodiment, in forming the first surface 14 and the second surface 15, reflective layers are provided on both surfaces of the reflecting plate 13, but
As in the second embodiment shown in FIG. 4, an antireflection surface 18 is provided on the light incident side, and the other surface has a first surface 19 that reflects only green light of visible light. The same effect can be obtained by the reflection plate 20 which is a plane plate and the plane plate 23 which is arranged in parallel with the reflection plate 20 and the air layer 21 in parallel and has the second surface 22 which reflects at least red and blue light on the incident side. Obtainable. With this configuration, the cost is somewhat higher, but the thickness of the plane-parallel plate is not constrained, so that even if the pixel pitch p is much smaller than in the present embodiment, it can be easily dealt with. Further, as in the third embodiment shown in FIG. 5, on the plane plate 25 provided with the second surface 24 that reflects at least red and blue light on the incident side, the green side of visible light is incident on the incident side of the light. The first that reflects only light
It can also be configured by providing a plane-parallel layer 27 having a surface 26 and made of a transparent material. With such a configuration, the parallel plane layer 27 does not need the strength for maintaining the flat surface, and thus the range of selection of plate thickness and material can be widened.

Next, a fourth embodiment will be described with reference to FIG. In the figure, 1 is a light source, and the light emitted from this light source 1 is controlled in one direction by a reflecting mirror 2. This light is incident on the incident side polarization plate 5 provided on the incident side glass 4 of the liquid crystal panel 3. The light transmitted through the incident-side polarization plate 5 receives the incident-side glass 4, the ITO film 6, the liquid crystal layer 7,
After passing through the ITO film 8, the color filter 9 is passed through. The portion 10a corresponding to the pixel driven according to the green color signal of the color filter 9 has a characteristic of transmitting only green light, and the portion 10b corresponding to the pixel driven according to the red color signal is Has a characteristic of transmitting only red light, and has a characteristic of transmitting only blue light to a portion 10c corresponding to a pixel driven according to a blue color signal. The light transmitted through the color filter 9 is transmitted through the emission side glass 11 and the emission side polarization plate 12, and is incident on the reflection plate 28 which is obliquely arranged with respect to the optical axis so that the light is incident at the incident angle θ. This reflector
Reference numeral 28 is a plane-parallel plate made of a transparent material, and the first surface 29 on the light incident side has a characteristic of reflecting only red and blue light of visible light, and the second surface 30 on the other surface. Has a property of reflecting green light of visible light. That is, of the light incident on the reflector 28, the red and blue lights are on the first surface 29 and the green light is on the first surface.
After passing through 29, after passing through the reflecting plate 28 and being reflected on the second surface 30, again passing through the reflecting plate 28, passing through the first surface 29 and guided to the projection lens 16, the liquid crystal panel on the screen 17 is thereby guided. The image above 3 is enlarged and projected.

FIG. 2 shows the arrangement of colors when the liquid crystal panel 3 is viewed from the emission side, as in the first embodiment. As described above, the red and blue lights are reflected by the first surface 29, and the green light is reflected by the second surface 30, so that the colors displayed on the liquid crystal panel 3 when viewed from the projection lens 16 are the same. , And the resulting projected image is an image in which the red and green images are shifted by half a pixel with the blue image as the center, as shown in FIG. That is, the incident angle θ with respect to the reflection plate 28, the refractive index of the material of the reflection plate 28, the plate thickness of green and the image of red are shifted to the blue image side by 1.5 times the pitch p between the pixels. Indicates that it is set.

As described above, also in the present embodiment, the color shift of the projected image can be reduced to about half in the projection type image display apparatus using the single plate, so that the image quality can be greatly improved. In the present embodiment, the red and blue lights are set to be reflected on the first surface 29, and the green light is set to be reflected on the second surface 30. However, the present invention is not limited to this, and is reflected on the first surface 29. 1 trio on the liquid crystal panel 3 (one set of R, G, B on the liquid crystal panel)
Of these, if the colors are adjacent to each other, they can be similarly configured. Further, in determining the color of each pixel, a color filter is used in the present embodiment, but it is not restricted to this, and color determination is performed by allowing pre-color-separated light to enter a predetermined position. The means for is not limited. The image display means is also a liquid crystal panel here, but is not limited to this.

In the present embodiment, when the first surface 29 and the second surface 30 are formed, the reflection layers are provided on both surfaces of the reflection plate 28.
As in the fifth embodiment shown in FIG. 8, a transparent material having an antireflection surface 18 on the light incident side and a first surface 31 on the other surface that reflects only red and blue light of visible light The same effect can be obtained by the reflecting plate 32 which is a parallel plane plate, and the plane plate 35 which is arranged in parallel with the reflecting plate 32 and the air layer 33 in parallel and has a reflecting surface 34 which reflects at least green light on the incident side. be able to. With this structure, the cost is somewhat higher, but since it is not restricted by the thickness of the plane-parallel plate, it is possible to easily cope with the case where the pixel pitch p is much smaller than that of the present embodiment. Further, as in the sixth embodiment shown in FIG. 9, on a plane plate 37 having a second surface 36 for reflecting at least green light on the incident side, red, blue, or red of visible light is incident on the light incident side. It can also be configured by providing a parallel plane layer 39 made of a transparent material having a first surface 38 that reflects only light. With such a structure, the parallel plane layer 39 does not need the strength for maintaining a flat surface, and thus the range of selection of plate thickness and material can be widened.

Next, a seventh embodiment will be described with reference to FIG. In the figure, 1 is a light source, and the light emitted from this light source 1 is controlled in one direction by a reflecting mirror 2. This light is incident on the incident side polarization plate 5 provided on the incident side glass 4 of the liquid crystal panel 3. The light transmitted through the incident-side polarization plate 5 receives the incident-side glass 4, the ITO film 6, the liquid crystal layer 7,
After passing through the ITO film 8, the color filter 9 is passed through. The portion 10a corresponding to the pixel driven according to the green color signal of the color filter 9 has a characteristic of transmitting only green light, and the portion 10b corresponding to the pixel driven according to the red color signal is Has a characteristic of transmitting only red light, and has a characteristic of transmitting only blue light to a portion 10c corresponding to a pixel driven according to a blue color signal. The light transmitted through the color filter 9 is transmitted through the emission side glass 11 and the emission side polarization plate 12, and is incident on the reflection plate 40 which is arranged obliquely with respect to the optical axis so that the light is incident at the incident angle θ. This reflector
Reference numeral 40 denotes a plane-parallel plate made of a transparent material. The first surface 41 on the light incident side has a characteristic of reflecting only green light of visible light, and the second surface 42 on the other surface is visible. Of the light, the red light is reflected, and further, the reflecting plate 43, which is a plane-parallel plate made of a transparent material in contact with the reflecting plate 40, has a surface opposite to the second surface 42. And a third reflecting surface 44 having a characteristic of reflecting at least blue light. This allows
Of the light incident on the reflection plate 40, the green light is the first surface 41 and the red light is transmitted through the first surface 41 and then through the reflection plate 40 to be the second surface.
It is reflected by 42, again transmitted through the reflection plate 40, transmitted through the first surface 41 and guided to the projection lens 16, and blue light is transmitted through the first surface 41 and then reflected by the reflection plate 40, the second surface 42, and the reflection surface. Third through plate 43
The light is reflected by the reflection surface 44, is transmitted again through the reflection plate 43, the second surface 42, the reflection plate 40, and the first surface 41, and is guided to the projection lens 16. As a result, the image on the liquid crystal panel 3 is enlarged and projected on the screen 17.

FIG. 2 shows the arrangement of colors when the liquid crystal panel 3 is viewed from the exit side, as in the first embodiment. As mentioned above, green light is on the first surface 41 and red light is on the second surface 41.
At 42, the blue light is reflected by the third reflecting surface 44, so that the arrangement of the colors displayed on the liquid crystal panel 3 is displaced when viewed from the projection lens 16, and as a result, the projected image is shown in FIG. In this way, the red image and the blue image are shifted and overlapped on the green image. That is, the incident angle θ with respect to the first surface 41, the reflection plate
The refractive index and plate thickness of the materials of 40 and 43 are set so that the red image is shifted by the pixel pitch p and the blue image is shifted by twice the pixel pitch p on the green image. Indicates that

As described above, also in this embodiment, the color shift of the projected image can be reduced to about half in the projection type image display apparatus using a single plate, so that the image quality can be greatly improved. In this embodiment, the green light is the first surface 41 and the red light is the second surface 41.
In 42, the blue light is set to be reflected by the third reflecting surface 44, but the present invention is not limited to this. Further, in determining the color of each pixel, a color filter is used in the present embodiment, but it is not restricted to this, and color determination is performed by allowing pre-color-separated light to enter a predetermined position. The means for is not limited. The image display means is also a liquid crystal panel here, but is not limited to this.

In the present embodiment, in forming the first surface 41, the second surface 42 and the third reflecting surface 44, the reflecting layers are provided on both surfaces of the reflecting plates 40 and 43. The first surface 46 on the light incident side made of a plane-parallel plate made of a transparent material has a property of reflecting only green light of visible light, and the other surface of The second surface 47 is provided in parallel with the second surface 47 with a reflecting plate 45 having a characteristic of reflecting red light of visible light, and an air layer 48 with respect to the reflecting plate 45, and at least blue. It can also be configured from a reflection plate 50 having a third surface 49 having the property of reflecting the above light. With such a configuration, the number of thin reflecting plates is reduced, which is advantageous in terms of workability.

Further, as in the ninth embodiment shown in FIG. 13, the anti-reflection surface 18 is provided on the light incident side and the first surface 51 for reflecting only green light of visible light is provided on the other surface. The reflecting plate 52, which is a plane-parallel plate made of a transparent material, and the second surface 54, which is arranged in parallel to the reflecting plate 52 with an air layer 53 therebetween, and reflects at least red light on the incident side, are provided. A reflecting plate 55, which is a plane-parallel plate made of a transparent material, having a characteristic of reflecting at least blue light on the surface opposite to the second surface 54, and the reflecting plate 55.
It may be configured by a flat plate 56 that supports the. Even with such a configuration, the number of thin reflecting plates can be reduced to one, and workability can be improved.

Further, in addition to the structure of the seventh embodiment shown in FIG. 10, by supporting the reflecting plate 43 with a flat plate 57 as in the tenth embodiment shown in FIG. The degree of freedom in strength can be made advantageous.

Although the color misregistration can be improved in each of the embodiments described above, the black display portion becomes large on the projected image, which may make it difficult to see the image as if it were seen through a mesh. It is also possible to improve this by introducing a diffraction grating into the projection optical system and enlarging the image in the direction in which the image is shifted in each embodiment.

[0027]

As described above, according to the present invention, a projection type image display device using a single plate composed of one liquid crystal panel and having a simpler structure than the three-plate type device is provided. The image becomes smaller, lighter and cheaper, and a good image can be provided by improving the color shift that has deteriorated the image quality of the image of the conventional projection type image display device using a single plate.

[Brief description of the drawings]

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

FIG. 2 is an explanatory diagram of a display section of the liquid crystal panel.

FIG. 3 is an explanatory diagram of a projected image on the display unit of the liquid crystal panel.

FIG. 4 is a configuration diagram of a reflector according to a second embodiment of the present invention.

FIG. 5 is a configuration diagram of a reflector according to a third embodiment of the present invention.

FIG. 6 is a configuration diagram of a projection-type image display device according to a fourth embodiment of the present invention.

FIG. 7 is an explanatory diagram of a projected image on the display unit of the liquid crystal panel.

FIG. 8 is a configuration diagram of a reflector according to a fifth embodiment of the present invention.

FIG. 9 is a configuration diagram of a reflector according to a sixth embodiment of the present invention.

FIG. 10 is a configuration diagram of a projection-type image display device according to a seventh embodiment of the present invention.

FIG. 11 is an explanatory diagram of a projected image on the display unit of the liquid crystal panel.

FIG. 12 is a configuration diagram of a reflector according to an eighth embodiment of the present invention.

FIG. 13 is a configuration diagram of a reflector according to a ninth embodiment of the present invention.

FIG. 14 is a configuration diagram of a reflector according to a tenth embodiment of the present invention.

[Explanation of symbols]

1 Light Source 2 Reflecting Mirror 3 Liquid Crystal Panel 4 Incident Side Glass 5 Incident Side Polarizing Plate 6 ITO Film 7 Liquid Crystal Layer 8 ITO Film 9 Color Filter 10a Part Corresponding to Pixel Driven According to Green Color Signal 10b Red Color Signal A portion corresponding to a pixel driven in accordance with 10 c A portion corresponding to a pixel driven according to a blue color signal 11 Emitting side glass 12 Emission side polarizing plate 13 Reflecting plate 14 First surface 15 Second surface 16 Projection lens 17 Screen 18 Antireflection Surface 19 First Surface 20 Reflector 21 Air Layer 22 Second Surface 23 Flat Plate 24 Second Surface 25 Flat Plate 26 First Surface 27 Parallel Flat Layer 28 Reflector 29 First Surface 30 Second Surface 31 1st surface 32 reflecting plate 33 air layer 34 reflecting surface 35 plane plate 36 2nd surface 37 plane plate 38 1st surface 39 parallel plane layer 40 reflecting plate 41 1st surface 42 2nd surface 43 Reflector 44 Reflector 45 Reflector 46 1st Surface 47 2nd Surface 48 Air Layer 49 3rd Surface 50 Reflector 51 1st Surface 52 Reflector 53 Air Layer 54 2nd Surface 55 Reflector 56 Flat Plate 57 Flat Plate

Claims (9)

[Claims] 1. A set of three pixels that can be independently controlled according to a first color signal, a second color signal, and a third color signal by a signal from the outside, and a large number of them are provided. An image display device, a projection lens arranged to be able to magnify and project an image of the image display device, at least a light source and a reflector provided so that light is condensed on the projection lens after being modulated by the image display device. And two reflecting surfaces are provided between the image display device and the projection lens obliquely to the optical axis connecting the image display device and the projection lens, and in parallel with each other. Of these, the reflecting surface on the image display device side (hereinafter referred to as the first reflecting surface) has a characteristic of reflecting the first color and transmitting the second color and the third color, while the other (hereinafter referred to as the second Reflective surface) is at least a second color,
An optical axis having a characteristic of reflecting a third color, and connecting the image display device and the projection lens when the pixel pitch of the set of three pixels of the image display device is arranged as p. The light of the first color reflected by the first reflecting surface and the light that has passed through the first reflecting surface
Reflected by the reflective surface of No. 2 and again transmitted through the first reflective surface,
The light of the third color is deviated by 1.5 × p, and the two reflecting surfaces are provided so that the first image is formed substantially at the center of the images of the second and third colors in the image projected by the projection lens. A projection type image display device characterized by being provided. 2. A set of three pixels that can be independently controlled according to a first color signal, a second color signal, and a third color signal by a signal from the outside, and a large number of them are provided. An image display device, a projection lens arranged to be able to magnify and project an image of the image display device, at least a light source and a reflector provided so that light is condensed on the projection lens after being modulated by the image display device. And two reflecting surfaces are provided between the image display device and the projection lens obliquely to the optical axis connecting the image display device and the projection lens, and in parallel with each other. Of these, the reflecting surface on the image display device side (hereinafter referred to as the first reflecting surface) is the first,
The second color has a characteristic of reflecting the second color and the third color of transmitting, and the other (hereinafter referred to as a second reflecting surface) has a characteristic of reflecting at least the third color. 3 above
Of the light incident along the optical axis connecting the image display device and the projection lens when the pixel pitch of one pixel set is arranged as p, the first light reflected by the first reflection surface,
The light of the second color and the light of the third color that has been transmitted through the first reflection surface, reflected by the second reflection surface, and transmitted again through the first reflection surface are deviated by 1.5 × p and projected. A projection type image display device, characterized in that the two reflecting surfaces are provided so that a third image is formed substantially at the center of the images of the first and second colors in the image projected by the lens. 3. A set of three pixels that can be independently controlled according to a first color signal, a second color signal, and a third color signal by a signal from the outside, and are provided with a large number thereof. An image display device, a projection lens arranged to be able to magnify and project an image of the image display device, at least a light source and a reflector provided so that light is condensed on the projection lens after being modulated by the image display device. And three reflection surfaces are provided between the image display device and the projection lens obliquely with respect to the optical axis connecting the image display device and the projection lens, and in parallel with each other. Of these, the reflection surface closest to the image display device (hereinafter referred to as the first reflection surface) has a characteristic of reflecting the first color and transmitting the second color and the third color, and the next reflection surface ( The second reflective surface below) reflects the second color and transmits the third color. The remaining reflective surface (hereinafter referred to as a third reflective surface) has a property of reflecting at least a third color, and the pixel pitch of the group of three pixels of the image display device is p. Of the light incident along the optical axis connecting the transmissive image display device and the projection lens, the first color light and the first reflection surface reflected by the first reflection surface. Light of the second color that has been transmitted through the second reflection surface and then again transmitted through the first reflection surface, and the second color light and the first and second reflection surfaces, and the third reflection. The light of the third color reflected by the surface and transmitted again through the first and second reflecting surfaces is shifted by p so that the images of the first, second and third colors are substantially overlapped in the image projected by the projection lens. A projection-type image display device comprising the three reflection surfaces. 4. The projection type image display apparatus according to claim 1, further comprising a diffraction grating provided between the image display apparatus and an image projected by the projection lens. 5. The projection type image display device according to claim 1, wherein the first reflecting surface is provided on one surface of the transparent substrate, and the second reflecting surface is provided on the other surface. 6. A transparent first substrate having one surface having antireflection treatment for the first, second and third colors and having the first reflection surface on the other surface, and a second reflection surface having one surface. The projection-type image display device according to claim 1 or 2, wherein the second substrate is provided in parallel with each other with a space therebetween. 7. A transparent first substrate having a first reflecting surface provided on one surface and a transparent second substrate having a third reflecting surface provided on one surface. The other surface of the first reflecting surface and the other surface of the third reflecting surface of the second substrate are in contact with each other, and the second reflecting surface is provided on the surface. Projection type image display device. 8. A transparent first substrate having one surface having antireflection treatment for the first, second and third colors and having a first reflection surface on the other surface, and a second reflection surface having a first reflection surface. Third on the other side on the board side
4. The projection type image display device according to claim 3, wherein the second substrate having the reflection surface of 1 is disposed in parallel with each other with a space therebetween. 9. A transparent first substrate having a first reflecting surface on one side and a second reflecting surface on the other side, and a second substrate having a third reflecting surface on one side. 4. The projection type image display device according to claim 3, wherein the projection type image display devices are arranged in parallel with each other with a space therebetween.