JPH10268229A - Stereoscopic color image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the availability of light of a stereoscopic color display device without spectacles and to suppress the increase of cost by utilizing light from a light source as an emitted light beams of red, green, blue in order to shorten a proper sighting distance. SOLUTION: This device is provided with a light source and a color liquid crystal panel 1 for forming an image for left eye and an image for right eye, a diffraction grating 2 is arranged on the side of the light source and a diffuser plate 3 is arranged on the side of the color liquid crystal panel 1 between the light source and the color liquid crystal panel 1, respectively, light from the light source is diffracted/dispersed into red, green, blue light by the diffraction grating 2, the light beam dispersed on the diffuser plate 3 arranged in the front part forms the image and, by restricting the images of red, green, blue light beams (3R, 3G, 3B) and the optical path from which light is transmitted depending upon the positional relation of the color filter of the color liquid crystal panel 1 arranged in the front part, left and right images are separated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stereoscopic image display apparatus without glasses, which can observe a color stereoscopic image without using special glasses.

[0002]

2. Description of the Related Art As an apparatus capable of observing a stereoscopic image without using special glasses, a slit-shaped opening is provided between a backlight and a liquid crystal panel as disclosed in Japanese Patent Application Laid-Open No. 7-182429. By arranging a light-shielding plate having the above, light from the backlight is made into striped light, and this striped light is separately incident on the left eye pixel and the right eye pixel of the liquid crystal panel, Some display three-dimensional images.

However, in the above-mentioned stereoscopic image display device, since the thickness of the glass substrate and the thickness of the polarizing plate constituting the liquid crystal panel are large, the suitable viewing position at which the stereoscopic image can be observed well is far from the display screen. There is a problem that they are separated.

An apparatus for solving the above problem is disclosed in Japanese Patent Application Laid-Open No. Hei 8-1.
No. 94190. As shown in FIG. 10, this stereoscopic video apparatus has a color filter 60 composed of a fine vertical stripe-shaped red filter 60R, a green filter 60G, and a blue filter 60B on a light-emitting side of a backlight 50 which is a flat light source. Is provided. Also, the red picture element 1R, the green picture element 1G, and the blue picture element 1B of the liquid crystal panel 1
Although not shown, a color filter of a color corresponding to the picture element is provided. A column in which left-eye picture elements l for displaying a left-eye image are vertically arranged and a row in which right-eye picture elements r are vertically arranged are alternately arranged in the left-right direction. I have. The color filter 60 and the liquid crystal panel 1
Are positioned and formed such that a set of left and right picture elements corresponds to one fine filter.

In the three-dimensional image display device, among the light emitted from the backlight 50, the minute red light 61R passing through the red filter 60R is converted into the green picture element 1 of the liquid crystal panel 1.
G, blue picture element 1B does not pass, only red picture element 1R passes. The red image light 61R passing through the left-eye picture element 1 of the red picture element 1R is condensed at the first position, and
Of the R, the red image light 61R passing through the picture element r for the right eye is focused on the second position. Similarly, with respect to minute light of other colors, the green image light 61G passing through the left-eye picture element 1 of the green picture element 1G is condensed at the first position, and the right-eye picture of the green picture element 1G. The green image light 61G passing through the element r is focused on the second position. The blue image light 61B passing through the left-eye picture element 1 of the blue picture element 1B is condensed at the first position, and the blue image light 61B passing through the right-eye picture element r of the blue picture element 1B.
B converges on the second position.

That is, at the first position, minute red image light 61R, green image light 61G, and blue image light 61B for the left eye.
Are collected, and minute red image light 61R, green image light 61G, and blue image light 61B for the right eye are collected. Therefore, the observer can appreciate a good color stereoscopic image by positioning the head such that the left eye 10L is present at the first position and the right eye 10R is present at the second position. .

In the three-dimensional image display device described above, the distance from the display screen of the liquid crystal panel 3 to the suitable viewing position (first and second positions) at which the three-dimensional image can be properly viewed, that is, the suitable viewing distance is:
One color filter 60R or 60G or 60B
Light emitted from the liquid crystal panel 1 passes through every three picture elements.
/ 3, which makes it possible to observe a color stereoscopic image near the display screen.

[0008]

However, in the above-described color stereoscopic image display device, since a color filter is arranged on the light source side, light is absorbed by the color filter, and the light utilization efficiency deteriorates. There was a problem.

Further, if a patterned interference film is arranged in place of the color filter, the light use efficiency is improved, but the patterning of the interference film is complicated / difficult to manufacture, resulting in an increase in cost. is there.

The present invention improves the light use efficiency of a color stereoscopic image display apparatus without glasses, which uses light from a light source as minute light emission of red, green, and blue in order to shorten an appropriate viewing distance. At the same time, it is intended to suppress cost increase.

[0011]

A color stereoscopic image display device according to the present invention includes a light source and a color liquid crystal panel for forming a left-eye image and a right-eye image. In between, a diffraction grating is disposed on the light source side, and a transmission screen is disposed on the liquid crystal panel side, and the light from the light source is diffracted into red, green, and blue light by the diffraction grating, and disposed in front of the diffraction grating. While imaging the split light on the transmission screen, red on the transmission screen,
The light path from which light is emitted is limited by the positional relationship between the green and blue light images and the color filters of the color liquid crystal panel disposed in front of the images to separate the left and right images.

As described above, the present invention utilizes the color spectral action of the diffraction grating as means for realizing minute light emission of red, green and blue on the light source side. By allowing light from a light source to enter the diffraction grating at a predetermined angle, red, green, and blue color spectroscopy can be performed. Therefore, by disposing a transmission screen (diffusion plate) in front of it, red,
Green and blue stripe light emission can be realized.

As described above, using a diffraction grating,
By forming the red, green, and blue stripe images, the light use efficiency is increased as compared with using a normal color filter. In addition, it can be realized relatively inexpensively as compared with using an interference filter.

Further, the present invention provides a plurality of red, green, and red light sources by arranging a plurality of diffraction gratings in front of the light source.
It can be configured to form an image of blue light.

According to the above configuration, it is not necessary to provide a light-shielding portion in the diffraction grating, so that the light use efficiency increases.

Further, according to the present invention, a first transmission screen is provided in front of one diffraction grating, and a lenticular lens is provided in front of the first diffraction grating and a second transmission screen is provided in front of the lenticular lens. One red, green, and blue light image formed on the first transmissive screen can be configured as a plurality of red, green, and blue light images corresponding to the pixels of the liquid crystal panel by the lenticular lens. .

According to the above configuration, only one diffraction grating is required, so that fine processing of the diffraction grating is not required.

Further, according to the present invention, a red filter that transmits red image light transmitted through a red picture element of the color liquid crystal panel and a green image light transmitted through a green picture element are transmitted to the observer side of the color liquid crystal panel. A color filter including a green filter and a blue filter transmitting blue image light transmitted through a blue picture element can be arranged.

According to the above arrangement, even if light that should not pass through adjacent picture elements at different viewpoints passes through adjacent picture elements at different viewpoints, the light is greatly attenuated by the color filter. Therefore, noise caused by the passage of light from another adjacent viewpoint is almost eliminated, and the observer can appreciate a good stereoscopic image.

Further, according to the present invention, a plurality of light sources are arranged,
By irradiating the diffraction grating with a plurality of light sources from a plurality of angles simultaneously, a two-dimensional image can be displayed by mixing the red, green, and blue light images on the transmission screen.

[0021]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention. FIG. 1 is a schematic diagram showing the configuration of the first embodiment of the color stereoscopic video display device of the present invention.

As shown in FIG. 1, this color liquid crystal stereoscopic image display device converts light emitted from a backlight (not shown) arranged on the back side of the color liquid crystal panel 1 and transmitted through the color liquid crystal panel 1 into a color image. An observer observes from the front side of the liquid crystal panel 1.

The color liquid crystal panel 1 includes a glass substrate 1
a and 1b sandwich a liquid crystal layer.
R, green picture element 1G, and blue picture element 1B are formed in a stripe shape. Although not shown, the color liquid crystal panel 1
Is provided with a color filter corresponding to each color for each picture element.

The color liquid crystal panel 1 includes a column in which left-eye picture elements 1 for displaying a left-eye image are arranged vertically and a right-eye image so that a three-dimensional image can be observed without glasses. The rows in which the right-eye picture elements r to be displayed are vertically arranged are alternately located on the left and right.

In FIG. 1, the pixels (pixels connected by lines) incident on the right eye 10R of the observer at the appropriate viewing position display the right eye image, and the pixels incident on the left eye 10L display the left eye image. I have.

Now, the color stereoscopic image display device of the present invention provides the picture elements 1R, 1G, 1B of the color liquid crystal panel 1.
The light from the backlight of the white light source is converted into a set of minute light emission of R, G, and B so that the light is arranged in the reverse order to the order in which
Give to the color liquid crystal panel 1.

In this embodiment, as means for converting the light of the backlight into a set of minute light emission of R, G and B, a diffraction grating 2 and a transmission type screen between the backlight and the liquid crystal panel 2 are provided. A diffusion plate 3 is provided.

The diffraction grating 2 is composed of a diffraction grating transmitting portion 2a in the form of a vertical stripe on which a diffraction grating is formed, and a light shielding portion 2b. The diffraction grating diffracts white incident light incident at a predetermined angle (for example, 40 °) with respect to an axis perpendicular to the diffraction surface into light of R, G, and B color components at a predetermined spatial period. Disperse.

For this reason, a backlight (not shown) has a function of converting white light into parallel light, and the optical axis Y is at a predetermined angle (for example, 4 °) with respect to an axis X perpendicular to the diffraction surface of the diffraction grating 2.
0 °). As the backlight, for example, a backlight provided with a minute focusing lens array and a white minute light source at the focal point of each minute lens array as disclosed in Japanese Patent Application Laid-Open No. HEI 8-19095 can be used.

The diffraction grating 2 emits light from the backlight toward the liquid crystal panel 1 only from the diffraction grating transmitting portion 2a. As described above, when light is made incident at a predetermined angle with respect to the diffraction grating, color separation of light occurs due to the diffraction effect. Therefore, a stripe pattern of a vertical stripe separated into red (3R), green (3G), and blue (3B) is formed on the diffusion plate 3 disposed in front thereof. Although this changes color continuously like a rainbow, FIG. 1 schematically shows 3R red light, 3G green light, and 3B blue light.

As shown in FIG. 1, the diffracting means 3 forms the stripe images of the red light (3R), the green light (3G) and the blue light (3B) on the diffusion plate 3 at a predetermined pitch. The width and pitch of the grating 2 and the distance between the diffraction grating 2 and the diffusion plate 3 are determined. Each pitch B1 of the stripe images of red light (3R), green light (3G), and blue light (3B) is expressed by the following equation (1).
Are determined so as to satisfy the relationship indicated by.

[0032]

B1 = 2LE / (E-3L) where E is the distance between the eyes of the observer and L is the pixel pitch of the liquid crystal panel.

As described above, the minute red light 3R passing on the diffusion plate 3 does not pass through the green picture element 1G and the blue picture element 1B of the liquid crystal panel 3, but passes through only the red picture element 1R. The red image light 1R passing through the left-eye picture element 1 of the red picture element 1R is focused on the first position, and the red image light 1R passing through the right-eye picture element r of the red picture element 1R. Collects light at the second position. Similarly, the green pixel 1
The green image light 1G passing through the picture element l for the left eye among the G
The green image light 1G passing through the right-eye picture element r among the green picture elements 1G is focused at the second position. Also,
Of the blue picture elements 1B, the blue picture light passing through the left-eye picture element l is focused on the first position, and the blue picture light 1B passing through the right-eye picture element r of the blue picture element 3B is the second picture element. Focus on the position.

That is, minute red image light 1R for the left eye, green image light 1G, and blue image light 1B are focused on the first position, and minute red image light 1R for the right eye and green image light. Light 1G,
The blue image light 1B is collected. Therefore, the observer can appreciate a good color stereoscopic image by positioning the head such that the left eye 10L is present at the first position and the right eye 10R is present at the second position. .

Next, a second embodiment of the present invention will be described with reference to FIG.
It will be described according to the following. FIG. 2 is a schematic diagram showing the configuration of the second embodiment of the color stereoscopic video display device of the present invention.
The difference between the second embodiment and the first embodiment is that a color filter 4 is arranged on the viewer side of the liquid crystal panel 1. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted here to avoid duplication of description.

In the first embodiment described above, the transmission filters used for each picture element of the liquid crystal panel 1 have wavelengths that pass different colors. For example, if the wavelength is approximately 4
Light of about 50 nm to 550 nm passes through both the blue picture element 1B and the green picture element 1G and has a wavelength of about 500 nm to 620.
Light around nm passes through both the green picture element 1G and the red picture element 1R. For this reason, light that should originally pass through one picture element and should not pass through a picture element of a different viewpoint adjacent thereto may pass through a picture element of an adjacent different viewpoint.
In this manner, when light from another adjacent viewpoint passes, the light is viewed by the observer as noise, which hinders viewing of a favorable stereoscopic image.

In the second embodiment, even when light of a certain color incident on the liquid crystal panel passes through another picture element, the observer can observe the left and right images in a good quality stereoscopic image. Is provided with a color filter 4 on the light emission side of the liquid crystal panel 1 so that the image can be observed. The color filter 4 includes a red filter 4R, a green filter 4G,
The color filters are constituted by blue filters 4B, and the arrangement order of the respective color filters is the same as the order of increasing the stripes of red, green and blue formed on the diffusion plate 3. That is, the diffusion plate 3 and the color filter 4 are arranged in the order of green, red, and blue from the left toward the viewer side from the liquid crystal panel 1, and the picture elements of the liquid crystal panel 1 are arranged from the liquid crystal panel 1 toward the viewer side. From the left, blue color picture elements and red picture elements are arranged in this order.

The color filter 4 is arranged at a position where the following expression 2 is satisfied, and the pitch B2 of the color filters is determined so that the following expression 3 is satisfied.

[0039]

T = D · 3L / E Here, D is a suitable viewing distance, T is a distance between a liquid crystal panel and a color filter, L is a pixel pitch of the liquid crystal panel, and E is a distance between eyes of an observer. .

[0040]

## EQU3 ## B2 = 2２LE / (E + 3L)

In the above-described color stereoscopic image display device, light is emitted from a backlight (not shown),
R, which is obtained by diffracting and separating G and B and given through the diffusion plate 3,
The G and B stripe-shaped lights pass through the red picture element 1R, the green picture element 1G, and the blue picture element 1B of the liquid crystal panel 1, respectively. The red light R passes through the red picture element 1R of the liquid crystal panel 1, and the image light R passing through the left picture element l is
The red image light R passing through the red filter 4 </ b> R to the first position and passing through the right-eye picture element r is
To the second position after passing through the red filter 4R.

On the other hand, the light RG of the component having a wavelength of 550 nm to 610 nm of the red light separated from the diffraction grating 2 also passes through the green picture element 1G of the liquid crystal panel 1. However, the light RG passing through the green picture element 1G is greatly attenuated when passing through the color filter 4.

Therefore, of the red light split by the diffraction grating 2, most of the light going to the first position is the light that has passed through the red picture element 1 R, which is the picture element l for the left eye of the liquid crystal panel 1. Almost no light passes through the green pixel, which is the right-eye pixel r adjacent to the pixel. Of the light split by the diffraction grating 2, most of the light traveling to the second position is light that has passed through the red picture element 1R, which is the picture element r for the right eye of the liquid crystal panel 1, and has a horizontal position. The light passing through the green picture element 1G, which is the picture element l for the left eye, which is adjacent to.

Next, the green light G similarly passes through the green picture element 1G of the liquid crystal panel 1, and the green image light G that has passed through the picture element l for the left eye is the green filter 4G of the color filter 4.
, The green image light G that has passed through the right-eye picture element r toward the first position passes through the green filter 4G of the color filter 4.
To the second position.

On the other hand, of the green light separated from the diffraction grating 2, the light GR of a component having a wavelength of 550 nm to 610 nm also passes through the red picture element 1 R of the liquid crystal panel 1 and has a wavelength of 48 nm.
The light GB having a component of 0 nm to 540 nm also passes through the blue picture element 1B of the liquid crystal panel 1. However, the lights GR and GB passing through the red picture element 1G and the blue picture element 1B are greatly attenuated when passing through the color filter 4.

Therefore, of the green light split by the diffraction grating 2, most of the light traveling toward the first position is the light that has passed through the green picture element 1 G, which is the picture element l for the left eye of the liquid crystal panel 1. Red picture element 1 that is the right picture element r adjacent to the
R, almost no light passes through the blue picture element 1B. Of the green light separated by the diffraction grating 2, most of the light traveling toward the second position is light that has passed through a green picture element 1 </ b> G, which is a picture element r for the right eye of the liquid crystal panel 1. Light passing through the red picture element 1R and the blue picture element 1B, which are the picture elements 1 for the left eye, which are horizontally adjacent, is almost eliminated.

Further, the blue light B similarly passes through the blue picture element 1B of the liquid crystal panel 1, and the blue video light G passing through the picture element 1 for the left eye is the blue filter 4B of the color filter 4.
, The blue image light B passing through the right-eye picture element r toward the first position passes through the green filter 4B of the color filter 4.
To the second position.

On the other hand, light BG of a component having a wavelength of 480 nm to 540 nm of the blue light separated from the diffraction grating 2 also passes through the green picture element 1G of the liquid crystal panel 1. However, light BG passing through the green picture element 1G is not
When passing through, it is greatly attenuated.

Therefore, of the blue light separated by the diffraction grating 2, most of the light traveling toward the first position is the light that has passed through the blue pixel 1 B, which is the left-eye pixel 1 of the liquid crystal panel 1. Green picture element 1G, which is the picture element r for the right eye adjacent to the
There is almost no light passing through. Of the blue light split by the diffraction grating 2, most of the light traveling toward the second position is light that has passed through the blue picture element 1 </ b> B, which is the right-eye picture element r of the liquid crystal panel 1. Almost no light passes through the green picture element 1G, which is the picture element l for the left eye adjacent horizontally.

In the above-described second embodiment, even if light that should not pass through adjacent picture elements at different viewpoints passes through adjacent picture elements at different viewpoints, the color filter 4
As a result, such light is greatly attenuated, so that noise caused by the passage of light from another adjacent viewpoint is almost eliminated, and the observer can appreciate a good stereoscopic image.

Next, a third embodiment of the present invention will be described with reference to FIG.
It will be described according to the following. FIG. 3 is a schematic diagram showing a configuration of a third embodiment of the color stereoscopic video display device of the present invention.
The difference between the third embodiment and the first embodiment is that the diffraction grating 21 also has a light collecting function.
The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted here to avoid duplication of description.

The diffraction grating 2 according to the third embodiment
1 also has a light condensing function, and this diffraction grating 21a can be formed continuously. For this reason, the light shielding portion 2b of the diffraction grating 2 in the first embodiment shown in FIG. 1 is not required.

Then, the stripes 3R, 3G and 3B of the red, green and blue lights are formed on the diffuser plate 3 at a predetermined pitch by the respective diffraction gratings 21a. The principle of separating the right-eye image and the left-eye image displayed on the liquid crystal panel using the RGB stripe images formed on the diffusion plate 3 is the same as that of the first embodiment.

In the third embodiment, since the light-shielding portion is not provided in the diffraction grating 21, the light use efficiency is increased as compared with the first embodiment.

Next, a fourth embodiment of the present invention will be described with reference to FIG.
It will be described according to the following. FIG. 4 is a schematic diagram showing a configuration of a color stereoscopic video display apparatus according to a fourth embodiment of the present invention.
The difference between the fourth embodiment and the third embodiment is that a color filter 4 is arranged on the viewer side of the liquid crystal panel 1. The same parts as those in the first to third embodiments are denoted by the same reference numerals, and description thereof is omitted here to avoid duplication of description.

The reason for arranging the color filter 4 on the viewer side of the liquid crystal panel 1 and the operation and effect thereof are the same as those of the second embodiment.

Next, a fifth embodiment of the present invention will be described with reference to FIG.
It will be described according to the following. FIG. 5 is a schematic diagram showing the configuration of the fifth embodiment of the color stereoscopic video display device of the present invention.
In the fifth embodiment, a diffraction grating 31 larger than that of the above-described first to fourth embodiments is used.
The same parts as those in the first to fourth embodiments are denoted by the same reference numerals, and description thereof will be omitted here to avoid duplication of description.

According to the fifth embodiment of the present invention, the first red, green, and green light beams are provided on the first diffusion plate 32 by the diffraction grating 31 larger than the diffraction gratings used in the first to fourth embodiments. The blue stripes 32R, 32G, 32B are formed. The red, green, and blue stripes formed on the first diffusion plate 32 are formed on the second diffusion plate 3 disposed in front thereof by the action of the minute lenticular screen 33 disposed in front thereof. Set of red, green and blue stripe images 3R, 3
G and 3B are formed.

In this embodiment, one set of red, green, and blue stripe images 3R, 3G, and 3B is formed for one lenticular lens 33a. The magnification and pitch of the lenticular lens 33a, the sizes of the first red, green and blue stripes formed on the first diffusion plate, the positional relationship with the lens, the second diffusion plate 3 and the lenticular lens 33a By optimizing the positional relationship and the like, it becomes possible to optimally form red, green, and blue stripe images on the second diffusion plate 3 at a predetermined pitch.

The principle of separating the right-eye image and the left-eye image displayed on every other line on the liquid crystal panel 1 using the RGB stripe images formed on the diffusion plate 3 is the same as in the first embodiment. Is the same. According to this embodiment, the diffraction grating 3
Since only one is required, fine processing of the diffraction grating is not required.

Next, a sixth embodiment of the present invention will be described with reference to FIG.
It will be described according to the following. FIG. 6 is a schematic diagram showing the configuration of the sixth embodiment of the color stereoscopic video display device of the present invention.
The sixth embodiment is different from the fifth embodiment in that a color filter 4 is arranged on the viewer side of the liquid crystal panel 1. The same parts as those in the first to fifth embodiments are denoted by the same reference numerals, and description thereof will be omitted here to avoid duplication of description.

The reason for arranging the color filter 4 on the viewer side of the liquid crystal panel 1 and the operation and effect thereof are the same as in the second embodiment.

Next, a seventh embodiment of the present invention will be described with reference to FIG.
It will be described according to the following. FIG. 7 is a schematic diagram showing the configuration of the seventh embodiment of the color stereoscopic video display device of the present invention.
The difference between the seventh embodiment and the fifth embodiment is that the diffraction grating 41 also has a light collecting function.
The same parts as those in the first to fifth embodiments are denoted by the same reference numerals, and description thereof will be omitted here to avoid duplication of description.

Since the diffraction grating 41 according to the seventh embodiment of the present invention also has a condensing function, each diffraction grating 4
1 can be made larger than the fifth embodiment, and the light use efficiency also increases.

Next, an eighth embodiment of the present invention will be described with reference to FIG.
It will be described according to the following. FIG. 8 is a schematic diagram showing a configuration of an eighth embodiment of the color stereoscopic video display device of the present invention.
The eighth embodiment is different from the seventh embodiment in that a color filter 4 is arranged on the viewer side of the liquid crystal panel 1. The same parts as those in the first to fifth embodiments are denoted by the same reference numerals, and description thereof will be omitted here to avoid duplication of description.

The reason for disposing the color filter 4 on the viewer side of the liquid crystal panel 1 and the operation and effect thereof are the same as those in the second embodiment.

FIG. 9 shows an embodiment for displaying a normal 2D video image according to the present invention. In the first embodiment, white light incident on the diffraction grating is supplied not from one direction 101 but from multiple directions 101, 102, and 103. Thereby, colors are mixed on the diffusion plate, and the diffusion plate emits only white light. Therefore, all the pixels on the liquid crystal panel can be observed with both eyes 10R and 10L of the observer. This enables normal 2D display without image degradation. This is the same in the third, fifth, and seventh embodiments.

[0068]

As described above, according to the present invention, in a color stereoscopic image display device without glasses using a color filter for shortening an appropriate viewing distance, the light use efficiency is increased and the cost is suppressed. Becomes possible.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a configuration of a first embodiment of a color stereoscopic video display device of the present invention.

FIG. 2 is a schematic diagram showing the configuration of a second embodiment of the color stereoscopic video display device of the present invention.

FIG. 3 is a schematic diagram showing a configuration of a third embodiment of the color stereoscopic video display device of the present invention.

FIG. 4 is a schematic diagram showing a configuration of a color stereoscopic video display device according to a fourth embodiment of the present invention.

FIG. 5 is a schematic diagram showing a configuration of a fifth embodiment of the color stereoscopic video display device of the present invention.

FIG. 6 is a schematic diagram showing a configuration of a color stereoscopic video display apparatus according to a sixth embodiment of the present invention.

FIG. 7 is a schematic diagram illustrating a configuration of a color stereoscopic video display device according to a seventh embodiment of the present invention.

FIG. 8 is a schematic diagram showing a configuration of an eighth embodiment of the color stereoscopic video display device of the present invention.

FIG. 9 is a schematic diagram when the present invention is used for two-dimensional video display.

FIG. 10 is a schematic diagram showing a configuration of a conventional color stereoscopic video display device.

[Explanation of symbols]

 Reference Signs List 1 color liquid crystal panel 2 diffraction grating 3 diffusion plate 10R right eye 10L left eye

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Susumu Tanase 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Eiji Nakayama 2-5-2 Keihanhondori, Moriguchi-shi, Osaka No. 5 Sanyo Electric Co., Ltd.

Claims (5)

[Claims] 1. A light source, a color liquid crystal panel for forming a left-eye image and a right-eye image, a diffraction grating between the light source and the color liquid crystal panel on the light source side, and a light source on the liquid crystal panel side. Each of the transmission screens is disposed, and the light from the light source is diffracted and separated into red, green, and blue light by the diffraction grating, and the separated light is imaged on the transmission screen disposed in front of the screen. And red on the transmissive screen,
A color stereoscopic image display device, wherein left and right images are separated by limiting an optical path from which light is emitted according to a positional relationship between a green and blue light image and a color filter of a color liquid crystal panel disposed in front thereof. . 2. The color stereoscopic image according to claim 1, wherein a plurality of red, green, and blue light images are formed by arranging a plurality of diffraction gratings in front of the light source. Display device. 3. A first transmission type screen is provided on the front surface of one diffraction grating, and a lenticular lens and a second transmission type screen are provided in front of the lenticular lens in front of the diffraction grating, and the first transmission type screen is provided. One red, green, and blue light image formed on the screen is converted into a plurality of red lights corresponding to the pixels of the liquid crystal panel by the lenticular lens.
The color stereoscopic image display device according to claim 1, wherein the color stereoscopic image display device is configured to generate green and blue light images. 4. A color filter which transmits a red image light transmitted through a red picture element of the color liquid crystal panel, a green filter which transmits a green image light transmitted through a green picture element, and a blue color, on an observer side of the color liquid crystal panel. 4. A color stereoscopic image display device according to claim 1, further comprising a color filter including a blue filter transmitting a blue image light transmitted through a picture element. 5. A two-dimensional image is displayed by arranging a plurality of light sources, simultaneously irradiating the diffraction grating with the plurality of light sources from a plurality of angles, and mixing red, green, and blue light images on a transmission screen. The color stereoscopic video display device according to any one of claims 1 to 4, wherein: