JP2004333561A - Stereoscopic image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problems of the conventional stereoscopic image system that only monochromatic images can be observed, images are dark, an image cannot be observed as a stereoscopic image when an observer who wears spectacles in a slanting state observes the image, a crosstalk of colors is caused, and resolution decreases to a half through an interlaced scanning system. <P>SOLUTION: An image display device for the left eye and an image display device for the right eye for displaying stereoscopic image, display a left-eye image and a right-eye image, respectively, each being obtained by separating color light of at least one of blue B, green G, and red R colors. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a three-dimensional image display device, and more particularly to a three-dimensional image display device that performs three-dimensional display by color separation.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there are an anaglyph system, a polarized glasses system, and a time-division liquid crystal system as stereoscopic image display systems for obtaining stereoscopic vision using glasses.
First, in the anaglyph method, the left and right images are composed of blue B and red R, respectively (need to have a complementary color relationship), and the composed left and right images are observed with blue B and red R glasses, respectively. This enables stereoscopic vision.
[0003]
The polarizing glasses method separates an image for the left eye and an image for the right eye by using a light shielding effect by a combination of orthogonal polarizing elements. In this method, two projectors are used to separate the left eye image and the right eye image, respectively. And the right-eye image are displayed simultaneously.
This method has advantages such as good color reproducibility and display of color moving images.
[0004]
In the time-division method, a left-eye image and a right-eye image are alternately displayed on the image display surface of one television every field period (1/60) sec. This is a method of opening and closing to observe a stereoscopic image. This method has an advantage that a stereoscopic image can be observed even when observing the screen while tilting the glasses.
[0005]
[Non-patent document 1]
"High Definition Display Technology", edited by the Institute of Image Information and Television Engineers, published September 1, 1997 by Corona.
[0006]
[Problems to be solved by the invention]
Each of the above-mentioned conventional stereoscopic image display methods has its own advantages, but also has the following problems.
First, the anaglyph method has a problem that only the monochrome image can be observed since the left and right images are composed of blue B and red R, respectively.
[0007]
Further, in the polarized glasses method, an image is dark because a polarizing filter having low transmittance (usually around 40%) is used. In addition, in the case of linearly polarized light, since images orthogonal to each other are used for the left-eye image and the right-eye image, crosstalk between the left and right images occurs when the observer observes the screen by tilting the glasses, and as a stereoscopic image. You will not be able to observe. In the case of circularly polarized light, there is no change in left and right separation even if the glasses are tilted, but there is a problem that when projected by an image projector, color crosstalk occurs due to the reflection of the screen.
[0008]
Further, in the time-division method, flicker easily occurs, and when a display device of the interlaced scanning method is used, there is a problem that the vertical resolution is reduced to half.
[0009]
An object of the present invention is to solve the above-mentioned problems, that is, only a monochrome image can be observed, an image becomes dark, an observer cannot observe a stereoscopic image when observing a screen by tilting glasses, or has a problem of color crosstalk. It is an object of the present invention to provide a three-dimensional image display device which solves the problem that image generation occurs or the vertical resolution is reduced to half in the interlaced scanning method.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the three-dimensional image display device of the present invention is configured such that each of the left-eye image display device and the right-eye image display device for displaying a three-dimensional image has at least one color light of blue, green, and red. , And a left-eye image and a right-eye image obtained by separating are displayed.
[0011]
Further, the three-dimensional image display device of the present invention is characterized in that at least one of the blue, green, and red color lights is separated into a region having a short wavelength and a region having a long wavelength. .
[0012]
Further, in the three-dimensional image display device of the present invention, one of the left-eye image display device and the right-eye image display device for displaying a three-dimensional image has an area where the wavelengths of the blue, green, and red color lights are short, and the other has an area. It is characterized in that regions of long wavelengths of blue, green, and red light are displayed, respectively.
[0013]
Further, in the stereoscopic image display device of the present invention, one of the left-eye image display device and the right-eye image display device for displaying a three-dimensional image has a short wavelength region of each of blue and red color light and a wavelength of green color light. Are displayed, and the other region displays a region where the wavelengths of the blue and red color lights are long and a region where the wavelength of the green color light is short.
[0014]
Further, in the three-dimensional image display device of the present invention, one of the left-eye image display device and the right-eye image display device for displaying a three-dimensional image has an area where the wavelengths of blue color light and green color light are short, and the other has a red color area. In this case, the regions having the long wavelengths of the green light and the green light are displayed.
[0015]
Further, the stereoscopic image display device of the present invention is characterized in that the left-eye image display device and the right-eye image display device are each configured by a liquid crystal projector.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail based on embodiments with reference to the accompanying drawings.
The three-dimensional image display device of the present invention, in principle, performs three-dimensional display by color separation similarly to the anaglyph method, but the anaglyph method can observe only a monochrome three-dimensional image. For example, stereoscopic viewing of a color moving image becomes possible.
[0017]
Prior to describing the present invention, the technology underlying the present invention will be described.
FIG. 1 shows a configuration example of a color projector using a liquid crystal display (LCD). This type of color projector is well known. For example, on page 136 of “High Definition Display Technology” edited by the Institute of Image Information and Television Engineers (see Non-Patent Document 1), a projection optical system configuration of FIG. It is described as an example.
[0018]
In FIG. 1, light (white light) generated from a light source 1 is separated and reflected only by blue dichroic light by a dichroic mirror 2, and the reflected color light is further guided by a reflecting mirror 3 to a blue B liquid crystal display 4. Then, the intensity is modulated (to be exact, the intensity is modulated by the luminance level of the image displayed on the liquid crystal display 4). Although not shown in FIG. 1, the light generated from the light source 1 is surface scanning light, and scans the image display surface of each of the liquid crystal displays 4, 6, and 7.
[0019]
The color light reflected by the dichroic mirror 2 is only blue B, and the other color light passes through the dichroic mirror 2 and only the red R color light is separated and reflected by the dichroic mirror 5, and the reflected color light is red R light. The light is guided to the liquid crystal display 6 and intensity-modulated. The color light transmitted through the dichroic mirror 5 is green G, and is guided to the green G liquid crystal display 7 for intensity modulation.
[0020]
The blue B color light whose intensity is modulated by the liquid crystal display 4 passes through the dichroic mirrors 8 and 9 and displays a blue B image on a screen 11 by the projection lens 10. The red R color light whose intensity has been modulated by the liquid crystal display 6 is reflected by the dichroic mirror 8 and then passes through the dichroic mirror 9 to display a red R image on the screen 11 by the projection lens 10. The green G color light whose intensity has been modulated by the liquid crystal display 7 is reflected by the reflection mirror 12 and the dichroic mirror 9 and then displayed on the screen 11 by the projection lens 10 to display a green G image.
[0021]
As described above, the white light emitted from the light source 1 is separated by the dichroic mirrors 2 and 5 into blue B, green G, and red R light (the blue B light is reflected by the dichroic mirror 2 and becomes green). The G color light passes through the dichroic mirror 5 and the red R color light is reflected by the dichroic mirror 5).
[0022]
FIG. 2 shows that when the modulation levels of the blue B, green G, and red R color lights are constant, the blue B, green G, and red R light colors on the screen 11 of the color projector using this liquid crystal display. The components are shown with wavelength on the horizontal axis.
Here, each color component of blue B, green G, and red R occupies the wavelength region of 400 nm to 500 nm, 500 nm to 600 nm, and 600 nm to 700 nm, respectively.
[0023]
FIG. 3 shows an example of the configuration of an image display device in which two color projectors using a liquid crystal display are used and the projection images of the two projectors are superimposed on a screen 11.
In FIG. 3, a left-eye color image signal and a right-eye color image signal are supplied to a left-eye color projector 13 and a right-eye color projector 14, respectively. The left-eye color image signal and the right-eye color image signal may be signals captured by a stereoscopic camera or reproduced from a recording medium on which a stereoscopic image is recorded. The supplied left-eye color image signal and right-eye color image signal are separated into blue B signal, red R signal, and green G signal, respectively, and the above-described liquid crystal displays 4, 6, 7 (FIG. 1). Used to display images.
[0024]
However, in order for a person to see an image superimposed on the screen 11 and recognize it as stereoscopic vision, a left-eye color image is displayed by the left eye, a right-eye color image is displayed by the right eye, and so on. And the right eye color image.
However, as shown in FIG. 2, each of the blue B, green G, and red R color light components on the screen 11 has exactly the same wavelength spectrum region for the left-eye color image and the right-eye color image. Even if any kind of glasses is used, it is not possible to distinguish between the left and right color images.
[0025]
Therefore, the stereoscopic image display device of the present invention has earnestly studied how to distinguish the left-eye color image and the right-eye color image when viewing the superimposed images on the screen 11. As a result, the present invention has been achieved.
That is, in the three-dimensional image display device of the present invention, each of the left-eye image display device and the right-eye image display device for displaying a three-dimensional image separates at least one color light of blue, green, and red. The obtained one and the other are displayed so that the left-eye color image and the right-eye color image can be distinguished and viewed.
[0026]
FIGS. 4A and 4B show a first embodiment of color light separation in the stereoscopic image display device of the present invention.
In the present embodiment, each of blue (B), green (G), and red (R) color lights (400 nm to 500 nm, 500 nm to 600 nm, and 600 nm to 700 nm) shown in FIG. 2 is placed at a substantially central wavelength position (450 nm and 550 nm, respectively). , 650 nm) to obtain a color image composed only of short wavelength regions (blue B 400 nm to 450 nm, green G 500 nm to 550 nm, and red R 600 nm to 650 nm, respectively) for each color light as shown in FIG. Then, the image is projected on the screen 15 by the color projector 13 for the left eye (see FIG. 3).
[0027]
In the present embodiment, each of the blue (B), green (G), and red (R) color lights (400 nm to 500 nm, 500 nm to 600 nm, and 600 nm to 700 nm) shown in FIG. , 550 nm, 650 nm), and as shown in FIG. 4B, a color image composed only of long wavelength regions (blue B 450 nm to 500 nm, green G 550 nm to 600 nm, and red R 650 nm to 700 nm, respectively) for each color light. And is projected on the screen 15 by the right-eye color projector 14 (see FIG. 3).
[0028]
In order to obtain a stereoscopic view from the color image projected on the screen 15, only the image projected by the left-eye color projector 13 can be seen by the left eye, and only the image projected by the right-eye color projector 14 by the right eye. As can be seen, the left eye has short wavelength regions of blue B, green G, and red R (blue B 400 nm to 450 nm, green G 500 nm to 550 nm, and red R 600 nm to 650 nm, respectively), that is, FIG. ) Is transmitted only to the right eye, and the right eye has long wavelength regions of blue B, green G, and red R (blue B 450 nm to 500 nm, green G 550 nm to 600 nm, and red R 650 nm to 700 nm, respectively), In addition, the spectacles shown in FIG.
[0029]
In this manner, the color images of blue B, green G, and red R shown in FIG. 2 are separated at substantially the center wavelength position, and each color light is composed of only a short wavelength region (see FIG. 4A). 1), the spectral transmission characteristic of the dichroic mirror 2 in FIG. 1 is set to transmit color light of 450 nm or more, the spectral transmission characteristic of the dichroic mirror 5 is set to reflect color light of 600 nm to 650 nm, and the dichroic mirror 8 of FIG. What is necessary is just to make the spectral transmission characteristic transmit color light of 600 nm or less, and to make the spectral transmission characteristic of the dichroic mirror 9 reflect the color light of 500 nm to 550 nm.
[0030]
Further, a color image (see FIG. 4B) in which each of the blue B, green G, and red R color lights shown in FIG. 2 is separated at a substantially central wavelength position and each color light is composed of only a region having a long wavelength. In order to obtain this, the spectral transmission characteristic of the dichroic mirror 2 in FIG. 1 is set to transmit color light of 500 nm or more, the spectral transmission characteristic of the dichroic mirror 5 is set to reflect color light of 650 nm to 700 nm, and the spectral transmission characteristic of the dichroic mirror 8 is set. The characteristics are such that the color light of 600 nm or less is transmitted, and the spectral transmission characteristics of the dichroic mirror 9 are such that the color light of 550 nm to 600 nm is reflected, and the reflection mirror 3 is replaced with a dichroic mirror that transmits the color light of 450 nm or less. do it.
[0031]
In general, a dichroic mirror is formed by laminating a dielectric multilayer film on a glass substrate, and the type and thickness of the dielectric multilayer film determines the wavelength of reflected and transmitted light. Since it does not relate to the method of making, the specification of the dichroic mirror used for the color projectors 14 and 15 for the left and right eyes is given, and the description of the first embodiment is ended.
[0032]
FIGS. 5A and 5B show a second embodiment of color light separation in the stereoscopic image display device of the present invention.
In the present embodiment, each of blue (B), green (G), and red (R) color lights (400 nm to 500 nm, 500 nm to 600 nm, and 600 nm to 700 nm) shown in FIG. 2 is placed at a substantially central wavelength position (450 nm and 550 nm, respectively). , 650 nm), and as shown in FIG. 5 (a), for the blue B and red R color lights, only the short wavelength regions (blue B 400 nm to 450 nm and red R 600 nm to 650 nm, respectively) are green G color lights. Is obtained by obtaining a color image composed only of a long wavelength region (green G 550 nm to 600 nm) and projecting it on the screen 15 by the left-eye color projector 13 (see FIG. 3).
[0033]
In the present embodiment, each of the blue (B), green (G), and red (R) color lights (400 nm to 500 nm, 500 nm to 600 nm, and 600 nm to 700 nm) shown in FIG. , 550 nm, and 650 nm), and as shown in FIG. 5B, only the long wavelength regions (blue B 450 nm to 500 nm and red R 650 nm to 700 nm) of the green G for each of the blue B and red R light beams. With respect to the color light, a color image composed of only a short wavelength region (green G 500 nm to 550 nm) is obtained, and is projected on the screen 15 by the right-eye color projector 14 (see FIG. 3).
[0034]
Also in the present embodiment, in order to obtain a stereoscopic view from the color image projected on the screen 15, only the image projected by the left-eye color projector 13 is seen by the left eye, and the right-eye color projector 14 is seen by the right eye. In the left eye, the short wavelength regions of blue B and red R color light (blue B 400 nm to 450 nm, red R 600 nm to 650 nm, respectively) and the green G color light A long region (green G 550 nm to 600 nm), that is, only the respective color lights shown in FIG. 5A are transmitted, and the right eye has long wavelength regions of blue B and red R (blue B 450 nm to 500 nm, respectively). Red R 650 nm to 700 nm) and the short wavelength region of green G color light (green G 500 nm to 550 nm), that is, only each color light shown in FIG. Mounting a so that glasses.
[0035]
In this way, the blue B, green G, and red R color lights shown in FIG. 2 are separated at substantially the center wavelength position, and the blue G and red R color lights are green G color light only in the short wavelength region. In order to obtain a color image composed of only a region having a long wavelength (see FIG. 5A), the spectral transmission characteristic of the dichroic mirror 2 in FIG. The spectral transmission characteristic is set to reflect color light of 600 nm to 650 nm, the dichroic mirror 8 is set to transmit color light of 600 nm or less, and the dichroic mirror 9 is set to reflect 550 nm to 600 nm color light. What should I do?
[0036]
In addition, the blue B, green G, and red R color lights shown in FIG. 2 are separated at substantially the center wavelength position, and the blue B and red R color lights are only in the long wavelength region, and the green G color light is In order to obtain a color image composed of only a short wavelength region (see FIG. 5B), the spectral transmission characteristic of the dichroic mirror 2 in FIG. The characteristic is to reflect color light of 600 nm to 650 nm, the spectral transmission characteristic of the dichroic mirror 8 is to transmit color light of 600 nm or less, and the spectral transmission characteristic of the dichroic mirror 9 is to reflect color light of 500 nm to 550 nm. Then, the reflecting mirror 3 may be replaced with a dichroic mirror transmitting color light of 450 nm or less.
[0037]
FIGS. 6A and 6B show a third embodiment of color light separation in the stereoscopic image display device of the present invention.
In the present embodiment, of the blue B, green G, and red R color lights (400 nm to 500 nm, 500 nm to 600 nm, and 600 nm to 700 nm, respectively) shown in FIG. For example, as shown in FIG. 6A, only the region of blue B color light (blue B 400 nm to 500 nm) and the region of short wavelength of green G color light (green G 500 nm to 550 nm) are used. The constructed color image is obtained and projected on the screen 15 by the left-eye color projector 13 (see FIG. 3).
[0038]
Further, in the present embodiment, of the blue B, green G, and red R color lights (400 nm to 500 nm, 500 nm to 600 nm, and 600 nm to 700 nm, respectively) shown in FIG. As shown in FIG. 6B, all the regions of red R color light (red R 600 nm to 700 nm) and the region of long wavelength of green G color light (green G 550 nm to 600 nm) are separated as shown in FIG. A color image composed only of the images is obtained, and projected on a screen 15 by the right-eye color projector 14 (see FIG. 3).
[0039]
Also in the present embodiment, in order to obtain a stereoscopic view from the color image projected on the screen 15, only the image projected by the left-eye color projector 13 is seen by the left eye, and the right-eye color projector 14 is seen by the right eye. In the left eye, the entire region of blue B color light (blue B 400 nm to 500 nm) and the region of short wavelength of green G color light (green G 500 nm to 550 nm), that is, FIG. Only the respective color lights shown in (a) are transmitted, and the entire region of the red R color light (red R 600 nm to 700 nm) and the longer wavelength region of the green G color light (green G 550 nm to 600 nm) to the right eye, that is, FIG. Wear glasses that transmit only the light of each color shown in FIG.
[0040]
In this way, of the blue B, green G, and red R color lights shown in FIG. 2, only the green G color light is separated at substantially the center wavelength position, and the entire region of the blue B color light and the green G color light are separated. In order to obtain a color image (see FIG. 6A) composed only of the short wavelength region, the spectral transmission characteristics of the dichroic mirror 2 in FIG. What is necessary is just to make the transmission characteristic reflect color light of 500 nm to 550 nm. In this embodiment, since the red R color light is not projected by the left-eye color projector 13, the dichroic mirror 5, the liquid crystal display 6, and the dichroic mirror 8 are unnecessary.
[0041]
Further, of the blue B, green G, and red R color lights shown in FIG. 2, only the green G color light is separated at a substantially central wavelength position, and the entire region of the red R color light and the wavelength of the green G color light are separated. In order to obtain a color image (see FIG. 6 (b)) composed only of a long region, the spectral transmission characteristic of the dichroic mirror 5 in FIG. 1 is set to reflect color light of 600 nm to 700 nm, and the dichroic mirror 8 is set to a reflecting mirror. And the spectral transmission characteristics of the dichroic mirror 9 may reflect color light of 550 nm to 600 nm. In the present embodiment, the blue light is not projected by the right-eye color projector 14, so that the dichroic mirror 2, the reflection mirror 3, and the liquid crystal display 4 are unnecessary.
[0042]
As described above, in the stereoscopic image display device of the present invention, each of the left-eye image display device and the right-eye image display device for displaying a stereoscopic image has at least one of blue B, green G, and red R. There is a feature in that one and the other obtained by separating the two color lights are displayed so that the left-eye color image and the right-eye color image can be distinguished and viewed. The present invention is not limited to the embodiments described above, but can be implemented with various modifications.
[0043]
For example, in the first embodiment, a color image composed of only a short wavelength region is obtained for each color light of blue B, green G, and red R, and projected on the screen 15 by the color projector 13 for the left eye. In addition, a color image composed only of a region having a long wavelength is obtained and projected on the screen 15 by the color projector 14 for the right eye. This is performed for each color light of blue B, green G, and red R. A color image composed only of the long wavelength region is obtained and projected on the screen 15 by the left eye color projector 13, and a color image composed only of the short wavelength region is obtained and the right eye color projector 14 is obtained. The projection may be performed on the screen 15 by using the short wavelength region and the long wavelength region in the display of the left and right images.
This is true for the first and second embodiments.
[0044]
In the above-described embodiment, each of the blue B, green G, and red R light beams is separated using a dichroic mirror (reflected and transmitted at a 45 ° incidence to the mirror plate). Of course, it may be performed using a vertical incidence type color filter.
[0045]
In the above-described embodiment, the three-dimensional image display device is configured by a color projector using a liquid crystal display. However, this is, for example, a three-dimensional image display device configured by a color projector using a cathode ray tube (CRT). It may be configured and is not limited to a liquid crystal display.
[0046]
Finally, it goes without saying that the stereoscopic image display device of the present invention may not be a projector-type stereoscopic image display device.
[0047]
【The invention's effect】
According to the present invention, a stereoscopic image display method using the conventional anaglyph method cannot obtain a stereoscopic view of a color image. Are both constituted by color images, so that a stereoscopic view of a color image (moving image) can be obtained.
[0048]
Further, according to the present invention, the left-eye image and the right-eye image are separated by using a color filter. Therefore, even if the observer observes the screen by tilting the glasses, the left and right images can be separated. The state does not change, and therefore, the state of stereoscopic vision does not change (the state of separation of the left and right images changes in the polarizing glasses system using the linear polarizing filter).
[0049]
In addition, when the stereoscopic image display device is configured according to the first and second embodiments, when the device is not used as a stereoscopic image display device, each color light of blue B, green G, and red R is emitted. It can be used as a six-color display with wide color reproduction. Therefore, when displaying a three-dimensional image, when the images displayed on the left-eye image display device and the right-eye image display device are respectively superimposed, the three-color display of blue B, green G, and red G is performed. , Each displayed color is a color with higher saturation.
[Brief description of the drawings]
FIG. 1 shows a configuration example of a color projector using a liquid crystal display.
FIG. 2 assumes that the modulation level of each of blue B, green G, and red R is constant, and that each of blue B, green G, and red R light components on a screen of a color projector using this liquid crystal display. Is shown with the wavelength on the horizontal axis.
FIG. 3 shows an example of the configuration of an image display device in which two color projectors using a liquid crystal display are used, and the projection images of the two projectors are superimposed on a screen.
FIG. 4 shows a first embodiment of color light separation in the stereoscopic image display device of the present invention.
FIG. 5 shows a second embodiment of color light separation in the stereoscopic image display device of the present invention.
FIG. 6 shows a third embodiment of color light separation in the stereoscopic image display device of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Light source 2, 5, 8, 9 Dichroic mirror 3, 12 Reflection mirror 4, 6, 7 Liquid crystal display 10 Projection lens 11 Screen 13 Color projector for left and right eyes 14 Color projector for right eye 15 Screen

Claims (6)

Each of the left-eye image display device and the right-eye image display device for displaying a stereoscopic image includes a left-eye image and a right-eye image obtained by separating at least one color light of blue, green, and red. A stereoscopic image display device characterized by displaying an image. 2. The stereoscopic image display device according to claim 1, wherein at least one of the blue, green, and red color lights is separated into an area having a short wavelength and an area having a long wavelength. Display device. One of the left-eye image display device and the right-eye image display device for displaying a three-dimensional image has a short wavelength region of each of blue, green, and red light, and the other has a wavelength of each of blue, green, and red light. A three-dimensional image display device characterized by displaying a long region of each. One of the image display device for the left eye and the image display device for the right eye for displaying a stereoscopic image displays one of the blue and red wavelength regions of short wavelengths and the long wavelength region of green color light, and the other displays blue and red. A three-dimensional image display device for displaying a long wavelength region of each color light and a short wavelength region of green color light. One of the image display device for the left eye and the image display device for the right eye for displaying a stereoscopic image has a short wavelength region of blue color light and green color light, and the other has a long wavelength region of red color light and green color light. A stereoscopic image display device characterized by displaying regions. A three-dimensional image display device, wherein the left-eye image display device and the right-eye image display device according to any one of claims 1 to 5 are each configured by a liquid crystal projector.

Images