JP2000206454A - Optical device and projection type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection type display device capable of displaying individual projected images in a seamless state. SOLUTION: This device has a light source 4, a first pyramid mirror 2 in which plural reflection surfaces are arranged in a many truncated pyramids state, and light emitted from the light source is branched into plural light beams, plural first optical path changing mirrors 7 changing the optical paths of the light beams branched by the respective reflection surfaces of the mirror 2, plural transmission type display panels 1 on which the light beams having the optical paths changed by the mirrors 7 are made incident, plural second optical path changing mirrors 8 changing the optical path of light modulated by each transmission type display panel, a second pyramid mirror 3 whose plural reflection surfaces are arranged in the many truncated pyramid state and which synthesizes the light made incident on the respective reflection surfaces and having the optical path changed by the mirror 8, and a projecting lens 5 projecting the light combined by the mirror 3 on a screen 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical element and a projection display device, and more particularly to a technique effective for displaying an image on a large screen and with high definition.

[0002]

2. Description of the Related Art In recent years, a demand for a display device on a large screen has been increased, and one problem is how to display a clear image on a large screen. As a technique for realizing a clear image, that is, a high-resolution display, for example, a method shown in FIG. 9 has been proposed and put to practical use. The method shown in FIG. 9 is a method of dividing one high-definition image into a plurality of regions and displaying the divided regions on a plurality of low-definition display devices 10, as shown in FIG. That is, the method shown in FIG. 9 is a method of displaying a high-definition image by combining a plurality of low-definition images displayed on the plurality of low-definition display devices 10. In the method shown in FIG.
In addition, although a high-definition display device can be realized, there is a disadvantage that seamless display cannot be performed due to a seam generated between the individual display devices.

On the other hand, as shown in FIGS. 10 and 11, for example, a method is known in which a low-definition projection display device 11 is used in place of the low-definition display device 10. In the methods shown in FIGS. 10 and 11, since the projection display device 11 is used, individual projection images can be seamlessly connected in principle. In particular, in the method shown in FIG. 11, since the high-definition image is synthesized before being incident on the projection lens 5 using the quadrangular pyramid mirror 3, only one projection lens 5 is required (in the method shown in FIG. There is an advantage that focus and zoom can be easily adjusted.

[0004]

However, in the methods shown in FIGS. 10 and 11, since each of the low-definition images constituting the high-definition image is a projection image, the difference in the color tone depending on the projection light source or the like. And a luminance distribution. FIG. 12 is a schematic diagram for explaining a typical luminance distribution of the projection display device 11. As shown in FIG. 12, in the projection display device 11, the brightness is high at the center, becomes darker toward the corners, and becomes lowest at four corners. When the low-definition projection display device 11 having such a luminance distribution is used to perform display with the configuration shown in FIG. 10 or FIG.
The luminance distribution is as shown in FIG. The luminance distribution shown in FIG.
The luminance distribution of the light source of FIG.
In the luminance distribution shown in (1), there is a problem that the central part of the image that should be noticed most by the user becomes dark and a low luminance area is generated along the peripheral part of the low-definition projection image. Furthermore, since there is a difference in luminance and color tone due to a change over time, even if the adjustment is performed once, a difference occurs between the low-definition projection images with the passage of time, and as a result, it is remarkable that the low-definition projection image is synthesized. However, there is still a problem that a seamless display cannot be performed. An object of the present invention is to provide a projection display device capable of seamlessly displaying individual projected images. . It is another object of the present invention to provide an optical element used in a projection display device capable of seamlessly displaying individual projected images. The above and other objects and novel features of the present invention will become apparent from the description of the present specification and the accompanying drawings.

[0005]

SUMMARY OF THE INVENTION Among the inventions disclosed in the present application, the outline of a representative one will be briefly described.
It is as follows. That is, the present invention relates to a polygonal columnar optical element that modulates light incident from one polygonal surface and emits light from the other polygonal surface, and has the same number of reflections as the side surfaces of the polygonal columnar optical element. A first polygonal mirror having a surface arranged in a polygonal pyramid shape, wherein the first polygonal mirror splits light incident from one of the polygonal surfaces into a plurality of light beams; and the first polygonal pyramid. A second polygonal pyramid mirror in which the same number of reflection surfaces as mirrors are arranged in a polygonal pyramid shape, wherein the second polygonal pyramid mirror combines light incident on each reflection surface and emits light from the other polygonal surface. And first and second optical materials provided around the first and second polygonal pyramid mirrors, the first and second optical materials having different refractive indexes, respectively, and the polygonal columnar optical material. The light branched by each reflection surface of the first polygonal pyramid mirror on each side surface of the element is the first light. Optical material and the second
At the interface where the light is refracted at the interface with the optical material, and the light modulated by each of the reflective display panels is the second light.
And a plurality of reflective display panels arranged at positions where the light is incident on each reflective surface of the polygonal pyramid mirror. Further, the present invention provides a polygonal columnar optical element that modulates light incident from one polygonal surface and emits light from one polygonal surface, wherein the same number of reflections as the side surfaces of the polygonal columnar optical element are provided. A polygonal pyramid mirror whose surface is arranged in a polygonal pyramid shape, and a polygonal pyramid mirror that splits light incident from one polygonal surface into a plurality of lights and combines light incident on each reflection surface, The optical material provided around the polygonal pyramid mirror, and on each side surface of the polygonal columnar optical element, at a position where the light branched by each reflection surface of the polygonal pyramid mirror is incident,
In addition, a plurality of reflective display panels are disposed at positions where light modulated by the reflective display panel is incident on each reflective surface of the polygonal pyramid mirror. In addition, the present invention provides a light source, a plurality of light modulation elements, and light projected from the light source being incident on the plurality of light modulation elements, and projecting light modulated by the plurality of light modulation elements onto a screen. Projection optical system comprising: a projection optical system, wherein the projection optical system includes a polygonal pyramid mirror in which a plurality of reflection surfaces are arranged in a polygonal pyramid, the light projected from the light source to the polygonal pyramid The light is split into a plurality of lights by a mirror and is incident on the light modulation element. The plurality of lights modulated by the light modulation element are combined by the polygonal mirror and projected on a screen. Further, the invention is characterized in that the light modulation element is a transmissive display panel. Further, the present invention is characterized in that the light modulation element is a reflective display panel.

Further, the present invention is a first polygonal pyramid mirror in which a light source and a plurality of reflection surfaces are arranged in a polygonal pyramid shape, wherein a first light beam from the light source is branched into a plurality of light beams. Polygon mirrors, and a plurality of first optical path changing mirrors provided for each reflection surface of the first polygonal mirror, and a plurality of first optical path changing mirrors provided for each of the reflection surfaces of the first polygonal mirror. A plurality of first optical path changing mirrors for changing an optical path, and a plurality of transmissive display panels provided for each of the plurality of first optical path changing mirrors, wherein each of the first optical path changing mirrors has an optical path. A plurality of transmissive display panels on each of which the light whose light has been changed are incident; and a plurality of second transmissive display panels provided for each of the plurality of transmissive display panels and changing an optical path of light modulated by each of the transmissive display panels. Optical path changing mirror, and a reflecting surface of the first polygonal pyramid mirror A second polygonal pyramid mirror in which the same number of reflecting surfaces are arranged in a polygonal pyramid shape, wherein a second light which is incident on each reflecting surface and whose light path is changed by each of the second optical path changing mirrors is combined. And a projection lens for projecting the light combined by the second polygonal mirror onto a screen. Further, the present invention is a first polygonal pyramid mirror in which a light source and a plurality of reflection surfaces are arranged in a polygonal pyramid shape, wherein the first polygonal pyramid splits light projected from the light source into a plurality of lights. A mirror and a plurality of optical path changing mirrors provided for each reflecting surface of the first polygonal pyramid mirror, wherein the plurality of optical path changing mirrors change the optical path of light branched by each reflecting surface of the first polygonal pyramid mirror. An optical path changing mirror, and a plurality of reflective display panels provided for each of the plurality of optical path changing mirrors, wherein a plurality of reflective display panels each receiving light whose optical path has been changed by each of the optical path changing mirrors. A display panel and a second polygonal pyramid mirror in which the same number of reflection surfaces as the reflection surfaces of the first polygonal pyramid mirror are arranged in a polygonal pyramid shape, and modulated by each of the reflection panels incident on each reflection surface. A second polygonal mirror for synthesizing the reflected light, and the second polygon. The light combined by the cone mirror, and having a projection lens for projecting onto a screen. Also, the present invention
A light source and a polygonal pyramid mirror in which a plurality of reflection surfaces are arranged in a polygonal pyramid shape. The light source divides light projected from the light source into a plurality of light beams and combines light incident on each reflection surface. A pyramid mirror, and a plurality of reflective display panels provided for each reflection surface of the polygonal pyramid mirror, wherein light branched by each reflection surface of the polygonal pyramid mirror is incident, and the incident light is modulated. A plurality of reflective display panels that are incident on each reflection surface of the polygonal pyramid mirror, a projection lens that projects light synthesized by the polygonal pyramid mirror onto a screen, and a projection lens provided between the polygonal pyramid mirror and the projection lens. A total reflection prism that reflects light projected from the light source in the direction of the polygonal pyramid mirror, and that impinges light synthesized by the polygonal pyramid mirror on a projection lens. Characteristic To.

Further, the present invention provides a light source, a polygonal columnar optical element into which light projected from the light source enters from one polygonal surface, and light emitted from the other polygonal surface of the optical element. And a projection lens for projecting the light onto a screen, wherein the optical element is a first polygonal mirror in which the same number of reflection surfaces as the side faces of the polygonal columnar optical element are arranged in a polygonal pyramid shape. And a first polygonal pyramid mirror for splitting light projected from the light source incident from one of the polygonal surfaces into a plurality of light beams, and the same number of reflecting surfaces as the side surfaces of the polygonal columnar optical element. A second polygonal pyramid mirror arranged in a pyramid shape, wherein the second polygonal pyramid mirror combines light incident on each reflection surface, and is provided around the first and second polygonal pyramid mirrors. First and second optical materials, each having a refractive index Are different from each other, and light branched on each reflection surface of the first polygonal pyramid mirror on each side surface of the polygonal columnar optical element is different from the first optical material and the second optical material. A plurality of light sources arranged at positions where the light is refracted at the interface with the optical material and is incident on each reflection surface of the second polygonal mirror at a position where the light modulated by each reflective display panel is incident. A reflective display panel. Further, the present invention provides a light source, a polygonal column-shaped optical element into which light projected from the light source is incident from one of the polygonal surfaces, and light emitted from one of the polygonal surfaces of the optical element. A projection lens for projecting, and a total reflection prism provided between the optical element and the projection lens, wherein the light projected from the light source is reflected in the direction of the polygonal pyramid mirror and emitted from the polygonal pyramid mirror. And a total reflection prism that causes the light to be incident on a projection lens, wherein the optical element has a polygonal pyramid shape in which the same number of reflection surfaces as the side surfaces of the polygonal columnar optical element are arranged. A pyramid mirror, which splits light incident from one polygonal surface into a plurality of lights, combines light incident on each reflection surface, and emits the light from one polygonal surface, The polygonal pyramid Mira An optical material disposed around, on each side of the polygonal prism-shaped optical element, in a position where the split optical incident on each reflection surface of the polygonal mirror,
In addition, a plurality of reflective display panels are arranged at positions where light modulated by each reflective display panel is incident on the reflective surface of the polygonal pyramid mirror.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings.

In all the drawings for describing the embodiments, those having the same functions are denoted by the same reference numerals, and their repeated description will be omitted.

[First Embodiment] FIG. 1 is a diagram showing a schematic configuration of a projection display apparatus according to a first embodiment of the present invention. As shown in the figure, in the projection display device of the present embodiment,
Between a light source 4 and a projection lens 5, first and second quadrangular pyramid-type mirrors (2, 3), four liquid crystal display panels 1 used as light modulation elements, and an optical path changing device Eight mirrors (7, 8) are arranged. In the present embodiment, light projected from the light source 4 is branched in four directions by the first quadrangular pyramid-shaped mirror 2, and one of the branched lights is reflected again by the first optical path changing mirror 7. Then, the light is incident on the liquid crystal display panel 1. The light incident on the liquid crystal display panel 1 is modulated by the liquid crystal display panel 1 into light having desired image data, and is again transmitted to the second optical path changing mirror 8.
Thus, the light is reflected in the direction of the second quadrangular pyramid mirror 3, reflected by the second quadrangular pyramid mirror 3, incident on the projection lens 5, and projected on the screen 6. Similarly, the remaining light split by the first quadrangular pyramid mirror 2 also includes the first optical path changing mirror 7, the liquid crystal display panel 1, the second optical path changing mirror 8, and the second quadrangular pyramid mirror. Projection lens 5 through 3
And is projected on the screen 6. At this time, the light split by the first quadrangular pyramid mirror 2 is combined by the second quadrangular pyramid mirror 3 and projected onto the screen 6 by the projection lens 5 to display an image.

FIG. 2 is a schematic diagram for explaining the luminance distribution of light in each wavy line portion shown in FIG. As shown in FIG. 1A, the luminance distribution at the dotted line AA ′ in FIG.
The luminance distribution of the light projected from the light source 4 shows the same distribution as that of FIG. 12, and as shown in FIG. 12B, the luminance distribution of the dashed line BB ′ of FIG. Square pyramid mirror 2
Has a distribution equivalent to one of the four distributions of the luminance distribution at the dotted line AA 'in FIG. Then, as shown in FIG. 12C, the luminance distribution of the broken line CC ′ in FIG. 1, that is, the luminance distribution after being synthesized by the second quadrangular pyramid mirror 3, has the same distribution as that in FIG. Becomes Thus, in the projection display device of the present embodiment,
After the light projected from the single light source 4 is branched into four lights by the quadrangular pyramid mirror 2 having four mirror surfaces, the light is two-dimensionally modulated by the light modulation element (the liquid crystal display panel 1).
Again, each light is reflected and combined by the quadrangular pyramid mirror 3 having four mirror surfaces, and the screen 6 is projected by the projection lens 5.
To project. Thereby, in the projection display device of the present embodiment, the luminance distribution of the image projected on the screen 6 is
Unlike the conventional projection display device shown in FIG. 11, the brightness distribution of the single light source 4 is obtained, and there is no variation in brightness due to the light source, and a seamless image can be displayed.

Second Embodiment FIG. 3 is a diagram showing a schematic configuration of a projection display apparatus according to a second embodiment of the present invention. As shown in FIG.
The liquid crystal display panel 1 is omitted, and instead of the second optical path changing mirror 8, a reflection type display panel 9, which is a light modulation element,
For example, DMD (Digital Micromirror)
or the first embodiment in that the first embodiment is used.
Is different from the projection type display device. Also in the present embodiment, the light projected from the light source is
Is branched in four directions, and one of the branched lights is the first
The light is again reflected by the optical path changing mirror 7 and enters the reflective display panel 9. Light incident on the reflective display panel 9 is modulated by the reflective display panel 9 and
The light is reflected by the reflective display panel 9 in the direction of the second quadrangular pyramid mirror 3, reflected by the second quadrangular pyramid mirror 3, incident on the projection lens 5, and projected on the screen 6. Thus, in the projection display device of the present embodiment,
Since the reflection type display panel 9 also serves as an optical path changing mirror, the second optical path changing mirror 8 in the first embodiment becomes unnecessary, and the optical loss generated in the second optical path changing mirror 8 is eliminated. be able to.

[Third Embodiment] FIG. 4 is a diagram showing a schematic configuration of a projection display apparatus according to a third embodiment of the present invention. As shown in the figure, the projection type display device of the present embodiment is a cubic optical element 20 including both a first quadrangular pyramid mirror 2 and a second quadrangular pyramid mirror 3, and is provided on four surrounding surfaces. The reflection type display panel 9 which is a light modulation element, for example, D
The cubic optical element 20 on which the MD is installed is used. In the present embodiment, the light projected from the light source 4 is branched in four directions by the first quadrangular pyramid mirror 2 in the cubic optical element 20, and one of the branched lights is the optical element 20. Of the first optical material (hereinafter, referred to as a medium A) and the second optical material (hereinafter, referred to as a medium B). Incident. The light incident on the reflective display panel 9 is modulated by the reflective display panel 9 and reflected by the reflective display panel 9 in the direction of the second quadrangular pyramid-shaped mirror 3. The light is reflected by the projection lens 5 to the projection lens 5.

FIG. 5 is a plan view showing a plane of the optical element 20 shown in FIG. As shown in FIGS. 4 and 5, the cubic optical element 20 includes a first quadrangular pyramid mirror 2 and a second quadrangular pyramid mirror 3, and includes a first quadrangular pyramid mirror 2 and a second quadrangular pyramid mirror. Medium A and Medium B around 3
Are provided, and the reflective display panel 9 is provided on four surrounding surfaces. Here, when the refractive index of the medium A is n1 and the refractive index of the medium B is n2, it is necessary to satisfy n1 <n2. Thereby, when the light projected from the light source 4 is reflected by the first quadrangular pyramid mirror 2 in the optical element 20 and then passes through the boundary surface between the medium A and the medium B, the light from the medium A and the medium B The light enters the reflective display panel 9 by a refraction phenomenon caused by a difference in the refractive index between the two. As described above, in the present embodiment, light is emitted from the light source to the reflective display panel 9 by utilizing the refraction effect between the medium A and the medium B in the optical element 20.
The optical path changing mirror in the first and second embodiments is not required. This makes it possible to eliminate light loss at the optical path changing mirror and to realize the projection display device itself at a small size and at low cost. Further, since the first quadrangular pyramid mirror 2, the second quadrangular pyramid mirror 3, and the reflective display panel 9 can be integrated, the optical arrangement can be easily adjusted at the time of manufacturing the projection display device, and the time can be improved. It is possible to alleviate the occurrence of an optical layout shift due to the change.

[Fourth Embodiment] FIG. 6 is a diagram showing a schematic configuration of a projection display apparatus according to a fourth embodiment of the present invention. As shown in the figure, in the projection display device of the present embodiment,
A total reflection prism 21 is disposed between the quadrangular pyramid mirror 2 and the projection lens 5. The total reflection prism 21 is a first optical material having a refractive index of n3 (hereinafter, referred to as a medium C).
And a second optical material having a refractive index of n4 (where n3 <n4) (hereinafter, referred to as a medium D), and is incident on the basis of a difference between the refractive indexes of the medium C and the medium D. Depending on the angle of incidence of light on the interface between the medium C and the medium D, the incident light is transmitted or reflected. In the present embodiment, the light projected from the light source 4 is totally reflected by the reflecting surface of the total reflection prism 21, enters the quadrangular pyramid mirror 2, and is branched by the quadrangular pyramid mirror 2 into four directions. The light split by the quadrangular pyramid-shaped mirror 2 is incident on a reflective display panel 9, for example, a DMD, which is a light modulation element disposed around the quadrangular pyramid mirror 2, and is modulated by the reflective display panel 9. ,
The light is reflected in the direction of the quadrangular pyramid mirror 2 by the reflective display panel 9. The light reflected and combined by the quadrangular pyramid mirror 2 passes through the total reflection prism 21 and is incident on the projection lens 5. Thus, in the projection display device of the present embodiment,
The quadrangular pyramid mirror 2 has both functions of branching and synthesizing the light projected from the light source 4, and the second quadrangular pyramid mirror 3 and the optical path changing mirror in the projection type display device of the above embodiment. 7 becomes unnecessary, and light loss at the mirror can be eliminated. Further, the projection display device itself can be realized in a small size and at low cost.

[Fifth Embodiment] FIG. 7 is a diagram showing a schematic configuration of a projection display apparatus according to a fifth embodiment of the present invention. As shown in the figure, the projection display device of the present embodiment has a cubic optical element 22 including a quadrangular pyramid mirror 2.
Then, a reflective display panel 9 as a light modulation element, for example, a cubic optical element 22 having a DMD installed on four surrounding surfaces is used. FIG. 8 shows the optical element 2 shown in FIG.
It is a top view which shows the 2nd plane. As shown in FIGS. 7 and 8, the cubic optical element 22 is
And an optical material (hereinafter, referred to as a perimeter) around the quadrangular pyramid mirror 2.
It is referred to as medium A. ) Is provided, and the reflection type display panel 9 is provided on four surrounding surfaces. In the present embodiment, the light projected from the light source 4 is totally reflected by the reflecting surface of the total reflection prism 21, enters the quadrangular pyramid mirror 2, and is branched by the quadrangular pyramid mirror 2 into four directions. The light split by the quadrangular pyramid mirror 2 is incident on a reflective display panel 9, for example, a DMD disposed around the quadrangular pyramid mirror 2, and is modulated by the reflective display panel 9.
The light is reflected in the direction of the quadrangular pyramid mirror 2 by the reflective display panel 9. The light reflected by the quadrangular pyramid mirror 2 passes through the total reflection prism 21 and enters the projection lens 5. As described above, in the projection type display device of the present embodiment, the quadrangular pyramid mirror 2 and the reflection type display panel 9 can be integrated, so that the optical arrangement adjustment during the production of the projection type display device is facilitated. In addition, it is possible to alleviate the occurrence of deviation of the optical layout due to a change with time.

In each of the above embodiments, the embodiment in which a quadrangular pyramid mirror is used has been described. However, the present invention is not limited to this.
It is also possible to use a polygonal pyramid mirror such as a hexagonal pyramid mirror. In each of the above embodiments, the case of monochrome display has been described, but R (red), G (green), B (blue)
If each of the light sources is prepared and screen projection is performed by three projection lenses 5, full-color display can be easily performed. In the first embodiment, a full-color display can be performed by using a color liquid crystal display panel as the liquid crystal display panel 1, and further, the second to fifth embodiments can be performed.
, Between the light source 4 and the quadrangular pyramid mirror 2, R
(Red), G (green), and B (blue) color filters are arranged, and full-color display is performed by changing the light from the light source 4 in a time-division manner from red to green to blue. Is possible.

As described above, the invention made by the present inventor is:
Although a specific description has been given based on the above-described embodiment, the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the gist of the invention.

[0019]

The effects obtained by typical ones of the inventions disclosed in the present application will be briefly described as follows. (1) According to the projection type display device of the present invention, unlike the conventional projection type display device, since a single light source is used, it is possible to display a seamless image without variation in luminance due to the light source. Become. (2) According to the optical element of the present invention, light loss can be reduced, and the projection display device itself can be realized at a small size and at low cost.

[Brief description of the drawings]

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

FIG. 2 is a schematic diagram for explaining a luminance distribution of the projection display device according to the first embodiment of the present invention.

FIG. 3 is a diagram illustrating a schematic configuration of a projection display device according to a second embodiment of the present invention.

FIG. 4 is a diagram showing a schematic configuration of a projection display device according to a third embodiment of the present invention.

FIG. 5 is a plan view showing a plane of the optical element shown in FIG. 4;

FIG. 6 is a diagram illustrating a schematic configuration of a projection display device according to a fourth embodiment of the present invention.

FIG. 7 is a diagram showing a schematic configuration of a projection display device according to a fifth embodiment of the present invention.

FIG. 8 is a plan view showing a plane of the optical element shown in FIG. 7;

FIG. 9 is a diagram showing a schematic configuration of a conventional display device that displays a large-screen image by using a plurality of low-definition display devices.

FIG. 10 is a diagram illustrating a schematic configuration of an example of a conventional projection display device that displays a large-screen image by using a plurality of low-definition projection display devices.

FIG. 11 is a diagram showing a schematic configuration of another example of a conventional projection display device that displays a large-screen image by using a plurality of low-definition projection display devices.

FIG. 12 is a schematic diagram for explaining a luminance distribution of a low-definition projection display device.

FIG. 13 is a schematic diagram for explaining the luminance distribution of a conventional projection display device that displays a large-screen image using a plurality of low-definition projection display devices.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Liquid crystal display panel, 2, 3 ... Square pyramid mirror, 4 ... Light source, 5 ... Projection lens, 6 ... Screen, 7, 8 ... Optical path changing mirror, 9 ... Reflection type display panel, 10 ... Low definition display device , 11 ... low-definition projection display device, 20, 22 ...
Optical element, 21: total reflection prism.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kenji Nakazawa 3-19-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Within Japan Telegraph and Telephone Corporation (72) Inventor Katojo Uehira 3-19, Nishishinjuku, Shinjuku-ku, Tokyo No. 2 Nippon Telegraph and Telephone Corporation F-term (reference)

Claims (10)

[Claims] 1. A polygonal columnar optical element that modulates light incident from one polygonal surface and emits light from the other polygonal surface, the same number of reflective surfaces as the side surfaces of the polygonal columnar optical element. Is a first polygonal pyramid mirror arranged in a polygonal pyramid shape, wherein the first polygonal pyramid mirror splits light incident from one polygonal surface into a plurality of light beams, and the first polygonal pyramid mirror. A second polygonal pyramid mirror in which the same number of reflection surfaces are arranged in a polygonal pyramid shape, wherein a second polygonal pyramid mirror that combines light incident on each reflection surface and emits light from the other polygonal surface; A first and a second optical material provided around the first and second polygonal pyramid mirrors, the first and second optical materials having different refractive indexes, respectively; and the polygonal columnar optical element. The light split on each reflection surface of the first polygonal pyramid mirror on each side surface of the first polygonal mirror is At the position where the light is refracted at the interface between the optical material and the second optical material and is incident, the light modulated by each of the reflective display panels is incident on each of the reflecting surfaces of the second polygonal mirror. An optical element comprising: a plurality of reflective display panels arranged at positions. 2. A polygonal columnar optical element that modulates light incident from one polygonal surface and emits light from one polygonal surface, the same number of reflecting surfaces as the side surfaces of the polygonal columnar optical element. Is a polygonal pyramid mirror arranged in a polygonal pyramid shape, the polygonal pyramid mirror that splits light incident from one polygonal surface into a plurality of lights and combines the light incident on each reflecting surface, An optical material provided around the polygonal pyramid mirror, and a position on each side surface of the polygonal columnar optical element where light branched by each reflection surface of the polygonal pyramid mirror is incident; and
An optical element, comprising: a plurality of reflective display panels arranged at positions where light modulated by the reflective display panel is incident on each reflective surface of the polygonal pyramid mirror. 3. A light source, a plurality of light modulators, and light projected from the light source is incident on the plurality of light modulators, and light modulated by the plurality of light modulators is projected on a screen. A projection optical system having a projection optical system, wherein the projection optical system includes a polygonal pyramid mirror in which a plurality of reflection surfaces are arranged in a polygonal pyramid shape, and the light projected from the light source is a polygonal pyramid mirror. A plurality of light beams which are incident on the light modulation element, are combined by the polygonal mirror, and are projected on a screen. 4. The projection display device according to claim 3, wherein the light modulation element is a transmission display panel. 5. The projection display device according to claim 3, wherein the light modulation element is a reflection display panel. 6. A first polygonal pyramid mirror in which a light source and a plurality of reflection surfaces are arranged in a polygonal pyramid shape, wherein the first polygonal pyramid mirror divides light projected from the light source into a plurality of lights. A plurality of first optical path changing mirrors provided for each reflection surface of the first polygonal pyramid mirror, wherein the optical paths of the light branched by the respective reflection surfaces of the first polygonal pyramid mirror are changed. A plurality of first optical path changing mirrors; and a plurality of transmissive display panels provided for each of the plurality of first optical path changing mirrors, wherein an optical path is changed by each of the first optical path changing mirrors. A plurality of transmissive display panels to which light is respectively incident, and a plurality of second optical path changing units provided for each of the plurality of transmissive display panels and changing an optical path of light modulated by each of the transmissive display panels. Mirrors and the same number of reflections as the reflection surfaces of the first polygonal pyramid mirror Is a second polygonal pyramid mirror arranged in a polygonal pyramid shape, and a second polygonal pyramid mirror that combines light whose optical path has been changed by each of the second optical path changing mirrors incident on each reflection surface. And a projection lens for projecting the light synthesized by the second polygonal pyramid mirror onto a screen. 7. A first polygonal pyramid mirror having a light source and a plurality of reflection surfaces arranged in a polygonal pyramid shape, wherein the first polygonal pyramid mirror splits light projected from the light source into a plurality of lights. And a plurality of optical path changing mirrors provided for each reflecting surface of the first polygonal pyramid mirror, the plurality of optical path changing mirrors changing an optical path of light branched by each reflecting surface of the first polygonal pyramid mirror. An optical path changing mirror, and a plurality of reflective display panels provided for each of the plurality of optical path changing mirrors, wherein a plurality of reflective displays each receiving light whose optical path has been changed by each of the optical path changing mirrors. A panel, and a second polygonal pyramid mirror in which the same number of reflection surfaces as the reflection surfaces of the first polygonal pyramid mirror are arranged in a polygonal pyramid shape. A second polygonal pyramid mirror for synthesizing the reflected light; The light combined by the cone mirror, a projection display device characterized by having a projection lens for projecting onto a screen. 8. A polygonal pyramid mirror in which a light source and a plurality of reflection surfaces are arranged in a polygonal pyramid shape, wherein light projected from the light source is split into a plurality of light beams and is incident on each reflection surface. A polygonal pyramid mirror for synthesizing light, and a plurality of reflective display panels provided for each reflection surface of the polygonal pyramid mirror, wherein light branched at each reflection surface of the polygonal pyramid mirror is incident, and is incident. A plurality of reflective display panels that modulate the reflected light and enter each reflection surface of the polygonal mirror; a projection lens that projects light synthesized by the polygonal mirror onto a screen; a polygonal mirror and a projection lens A total reflection prism that reflects light projected from the light source in the direction of the polygonal pyramid mirror and that enters light projected by the polygonal pyramid mirror into a projection lens. And Projection display apparatus characterized by. 9. A light source, a polygonal column-shaped optical element into which light projected from the light source is incident from one polygonal surface, and a light projected from the other polygonal surface of the optical element is projected onto a screen. A projection lens having a projection lens, wherein the optical element is a first polygonal pyramid mirror in which the same number of reflection surfaces as the side surfaces of the polygonal columnar optical element are arranged in a polygonal pyramid, A first polygonal pyramid mirror for dividing light projected from the light source incident from one polygonal surface into a plurality of light beams, and the same number of reflection surfaces as the side surfaces of the polygonal columnar optical element are arranged in a polygonal pyramid shape A second polygonal pyramid mirror that combines light incident on each reflecting surface, and first and second polygonal pyramid mirrors provided around the first and second polygonal mirrors. A second optical material having a different refractive index; And a second optical material, and light branched on each reflection surface of the first polygonal pyramid mirror on each side surface of the polygonal columnar optical element is formed by the first optical material and the second optical material. A plurality of reflective display panels arranged at positions where the light is refracted at the interface and incident on the reflective display panels, and where the light modulated by each reflective display panel is incident on each reflective surface of the second polygonal mirror. And a projection-type display device. 10. A light source; a polygonal column-shaped optical element into which light projected from the light source is incident from one polygonal surface; and a light projected from one polygonal surface of the optical element onto a screen. And a total reflection prism provided between the optical element and the projection lens, and reflects light projected from the light source in the direction of the polygonal mirror, and is emitted from the polygonal mirror. A total reflection prism that makes incident light into a projection lens, wherein the optical element has a polygonal pyramid in which the same number of reflection surfaces as the side surfaces of the polygonal columnar optical element are arranged in a polygonal pyramid shape. A mirror, which splits light incident from one polygonal surface into a plurality of lights, combines light incident on each reflecting surface, and emits the light from one polygonal surface; Polygon pyramid An optical material disposed around the over, for each side of the polygonal prism-shaped optical element, at the point the split optical incident on each reflection surface of the polygonal mirror, and
A projection display device comprising: a plurality of reflection display panels arranged at positions where light modulated by each reflection display panel is incident on a reflection surface of the polygonal mirror.