JPH0715752A - Projection type video display device - Google Patents

Abstract

PURPOSE:To enable an observer to recognize a satisfactory stereoscopic picture by completely separating picture element information for right eye and that for left eye from each other. CONSTITUTION:The first picture element image array where first picture element images 7R exist with a black matrix image between them in the vertical direction and the second picture element array where second picture element images 7R exist with a black matrix image between them in the vertical direction are alternately placed in the horizontal direction by first and second projectors 3a and 3b. Second picture element images 7L are formed in positions which are shifted from first picture element images 7R in the vertical direction by 1/2 of a picture element pitch Pv, and black parts 14 are formed in parts where black matrix images are placed on this screen.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection type image display device such as a stereoscopic image display device which does not use glasses.

[0002]

2. Description of the Related Art Conventionally, a stereoscopic image is produced by using stereoscopic perception by human's binocular parallax by using electronic and optical means so that images with different parallax can be independently perceived by human eyes. A stereoscopic image display device for displaying has been proposed. As this stereoscopic image display device, the viewer wears special glasses such as polarized glasses and liquid crystal shutter glasses,
An eyeglass system that allows the observer's left and right eyes to recognize independent images, and an optical screen that has directivity when transmitting light through a lenticular plate or parallax barrier, etc. are arranged to allow the observer's left and right eyes to recognize independent images There is a method without glasses. Among the above methods, the one using a lenticular plate without glasses is disclosed in, for example, JP-A-63-24829.
It is disclosed in Japanese Patent Laid-Open No. 3 and Japanese Patent Laid-Open No. 3-65943.

FIG. 4 is a diagram showing the principle of a stereoscopic image display device of the type using a lenticular plate without the above-mentioned glasses.
This is the pixel R1, R2 ... displaying the image information for the right eye.
.. and pixels L1 and L2 displaying video information for the left eye ...
1 and 2 are alternately arranged in the horizontal direction, and a lenticular plate 1 in which a large number of stripe-shaped lenticular lenses are arranged at intervals substantially corresponding to the pitch of 2 pixels is arranged on the front surface. In this case, the light flux emitted from each pixel reaches the left and right eyes L and R of the observer located in front of the lenticular plate 1 by the lens refracting action of the lenticular plate 1, respectively, as shown in FIG. That is, the luminous flux emitted from the pixel L1 displaying the video information for the left eye reaches only the left eye L, and the luminous flux emitted from the pixel R1 displaying the video information for the right eye reaches only the right eye R. To do. Note that the left-eye and right-eye pixels L1, L2, ..., R1, R2, ... Have image information having parallax in the same situation as when humans perform stereoscopic perception by binocular parallax (hereinafter , Which is referred to as parallax information), which allows the observer to recognize a stereoscopic image.

However, in such a stereoscopic image display device, since it is necessary to sort one image according to the number of viewpoints, there arises a problem that the resolution decreases in proportion to the number of viewpoints. For example, when an image having 1440 pixels in the horizontal direction is stereoscopically displayed by the binocular method with two viewpoints, 1440 pixels are displayed for the right eye and 720 pixels for the left eye.
Since it is divided into 20 pixels, only a stereoscopic image of 720 pixels for one eye can be reproduced. Further, in the case of a four-eye system in which the number of viewpoints is 4, only 360 pixels are assigned to the image of each viewpoint, so that the image quality deterioration becomes more remarkable.

In order to eliminate the above-mentioned deterioration in resolution, a projection type stereoscopic system is used in which a plurality of projectors are used and pixel images from the respective projectors are enlarged and projected in a state where they are alternately inserted (interrib) in the horizontal direction. Video display devices have been proposed.

FIG. 5 is a perspective view showing the overall construction of a twin-lens projection type stereoscopic image display device using two projectors.

In the figure, 2 is a stereoscopic image information generator, 3a, 3
Reference numeral b is a first and second liquid crystal projector, and 4 is a lenticular screen in which a lenticular plate 6 is provided on the light exit surface side of the diffusion plate 5. To the first liquid crystal projector 3a, a video signal having information of the right eye taken by a video camera corresponding to the right eye of a human is input from the stereoscopic image information generator 2, and the second liquid crystal projector 3a is provided. 3b
A video signal having left-eye information captured by a video camera corresponding to a human left eye is input from the stereoscopic video information generator 2. Each of the first and second liquid crystal projectors 3a and 3b projects light having image information corresponding to an image having left and right eye information on the diffusion plate 5. At this time, the first pixel image for the right eye and the second pixel image for the left eye are imaged on the diffusion plate 5 so as to alternate in the horizontal direction, and the lens image formation of the lenticular plate 6 is performed. By the action, the observer enters the pixel information for the right eye into the right eye and the pixel information for the left eye into the left eye, and recognizes a stereoscopic image by the binocular parallax.

FIG. 6 is a view showing the image formation state of pixel images on the diffusion plate of the above-mentioned twin-lens type projection stereoscopic image display device.

As shown in FIG. 6, the pixel images are arrayed on the diffusion plate 5 in the vertical direction so that the pixel images 7R for the right eye are arranged in a line through the black matrix image 8 to form a pixel image line. Further, the pixel images 7L for the left eye are also arranged in a line via the black matrix image 8 to form a pixel image column. Further, in the horizontal direction, the pixel image 7 for the right eye
The R and the pixel image 7L for the left eye are arranged in an interleaved state. However, in such cases,
Since the widths of the left and right pixel images 7L and 7R are large, there are overlapping portions 9 at the boundary between adjacent pixel images. When the parallax information is displayed in such a situation, an image different from the parallax information to be originally recognized is mixed, the image quality of the stereoscopic image is impaired, and stereoscopic viewing becomes difficult.

As a solution to the above problem, FIG.
, The left and right pixel images 7L on the diffusion plate 5,
The black stripe portion 10 is previously formed on the overlapping portion of 7R.
There is proposed a projection type stereoscopic image display device in which the black stripe portion 10 is formed to shield the light in the overlapping portion.

However, in this projection type stereoscopic image display device, when the observer moves, there is a time when the line of sight crosses the area of the black stripe portion 10, and at this time, the observer recognizes the screen as black display, There is a problem that a good stereoscopic image cannot be recognized.

Further, the problem of pixel image overlap shown in FIG.
The problem is not limited to a stereoscopic image display device, and even in a planar image projection image display device that performs interleaved display using two projectors to improve resolution, adjacent pixel images overlap and the projected image There is a problem that the image quality is impaired.

[0013]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks of the prior art. In a projection type stereoscopic image display device without glasses, a first pixel image is formed by using two projectors. The problem that the image quality of the stereoscopic image is impaired when adjacent pixels are overlapped with the second pixel image by interleaving the images without recognizing the black display even when the observer moves. The purpose is to resolve.

Further, according to the present invention, in a projection type video display device for displaying a plane image, when two projectors are used to interleave the pixel images from each other in order to increase the resolution, adjacent pixel images overlap each other. Therefore, it is an object of the present invention to solve the problem that the image quality of a projected image is impaired.

[0015]

According to the present invention, there are provided first and second projectors, and first and second projectors project and form a first pixel image and a second pixel image, respectively. First,
What is claimed is: 1. A projection type stereoscopic image display device comprising a screen for separating a second pixel image into pixel information for the right eye and pixel information for the left eye, wherein the first pixel image is in a vertical direction on the screen. A first pixel image row existing through the black matrix image and a second pixel image row in which the second pixel image exists vertically through the black matrix image are alternately positioned in the horizontal direction, In addition, the second pixel image is formed with a shift of 1/2 of the pixel pitch in the vertical direction with respect to the first pixel image, and a light blocking portion is provided in a portion of the screen where the black matrix image is located. It is characterized by being formed.

Further, in the present invention, the light-shielding portion is larger than the black matrix portion and has portions on both sides thereof which overlap the first or second pixel image, and the light-shielding portion in the first pixel image row is provided. One side end portion and the other side end portion of the light-shielding portion in the second pixel image row are positioned on a substantially straight line in the vertical direction.

Further, in the present invention, the screen is the first,
The diffusion plate comprises a diffusion plate on which a second pixel image is formed, and a separation means for separating the first and second pixel images into pixel information for the right eye and pixel information for the left eye. Is characterized in that the above-mentioned light-shielding portion is formed.

Further, the present invention is characterized in that the diffusion plate is a transparent plate to which a diffusion sheet is attached, and the light shielding portion is formed on the diffusion sheet.

Furthermore, the present invention is characterized in that the first pixel image is a pixel image for the right eye and the second pixel image is a pixel image for the left eye.

The present invention also includes an image including first and second projectors, and a screen on which the first pixel image and the second pixel image are projected and formed by the first and second projectors. In the display device, a first pixel image row in which a first pixel image is present in the vertical direction via a black matrix image and a second pixel image is present in the screen in the vertical direction via a black matrix image. Existing second pixel image columns are alternately located in the horizontal direction, and the second pixel image is ½ of the pixel pitch in the vertical direction with respect to the first pixel image.
A light-shielding portion is formed at a portion of the screen where the black matrix image is located, the light-shielding portion being formed with a shift.

Further, in the present invention, the light shielding portion is larger than the black matrix portion and has portions on both sides thereof overlapping the first or second pixel image, and the light shielding portion in the first pixel image row is provided. One side end portion and the other side end portion of the light-shielding portion in the second pixel image row are positioned on a substantially straight line in the vertical direction.

[0022]

According to the above structure, since the second pixel image is displaced from the first pixel image in the vertical direction by 1/2 of the pixel pitch, the first pixel image and the second pixel image are different from each other. There is no overlapping part.

Further, the light shielding portion has portions on both sides thereof which overlap the first or second pixel image, and one side end portion of the light shielding portion in the first pixel image row and the second pixel. Since the other side end of the light-shielding portion in the image row is positioned on a substantially straight line in the vertical direction, the first pixel image and the second pixel image are completely separated in the vertical direction, and also in the vertical direction. There is no black stripe portion where no pixel image exists.

Further, the screen can be easily formed by forming the diffusion plate by attaching a diffusion sheet to the transparent sheet and forming the light shielding portion on the diffusion sheet.

[0025]

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

The twin-lens projection type stereoscopic image display device of this embodiment is basically the same as the above-mentioned configuration of FIG.
The first pixel image for the right eye is projected by the liquid crystal projector 3a, and the second pixel image for the left eye is projected by the second liquid crystal projector 3b.

FIG. 1 is a diagram showing a structure of a diffusion plate which is a part of a lenticular screen in the projection type stereoscopic image display apparatus of this embodiment, and FIG. 2 is a pixel image for the left eye and a right eye on the diffusion plate. It is a figure which shows the image formation state with the pixel image for.

In this embodiment, the diffusing plate 11 is made of a transparent acrylic plate 12 and a diffusing sheet 13 attached to the diffusing plate 13. At a desired position of the diffusing sheet 13, a black portion (light-shielding portion) will be described later. Many 14 are formed.

As shown in FIG. 2, the pixel images formed on the diffusion sheet 13 of the diffusion plate 11 are arranged in the vertical direction in the first, third, fifth and odd columns. Eye M1,
In M3, M5, ..., the pixel images 7R for the right eye formed by the first liquid crystal projector are imaged in line through the portion corresponding to the black matrix image, and One pixel image row is formed. Also, the second, fourth,
6th even-numbered columns M2, M4, M6 ...
Indicates that the pixel image 7R for the right eye is adjacent to the portion corresponding to the black matrix image of the first pixel row.
The pixel image 7L for the left eye by the second liquid crystal projector is shifted by 1/2 of the pixel pitch Pv in the vertical direction with respect to
Are aligned in a line through a portion corresponding to a black matrix image to form a second pixel image line for the left eye.

The arrangement of the pixel images formed on the diffusion sheet 13 in the horizontal direction is the first, third, fifth ...
In the odd-numbered rows N1, N3, N5 ...
The pixel images 7R for the right eye are formed side by side through the portion corresponding to the black matrix image, forming a first pixel image row for the right eye. Also, the second, fourth and sixth
The even-numbered rows N2, N4, N6, ... Of the right-eye pixel image are adjacent to the portion corresponding to the black matrix image of the right-eye pixel column. The pixel image 7L for the left eye is imaged in line in a row through the portion corresponding to the black matrix image, which is shifted by 1/2 of the pixel pitch Ph in the horizontal direction as compared with 7R. Second
Form a pixel image row of.

On the diffusion sheet 13, when the pixel images 7R and 7L are formed as described above, the black portion 1 described above is located at a portion where a portion corresponding to a black matrix image is located.
4 is formed in advance. That is, the black portion 14 is an odd-numbered column when the pixel image is formed on the diffusion sheet 13, and a portion that is an even-numbered row and an even-numbered column,
In addition, they are formed in odd-numbered rows, and are arranged in a zigzag pattern so as to form a checkered pattern. Therefore, the pixel images 7R for the right eye are formed on the black portions 14 formed in the odd-numbered columns and the even-numbered rows so as to be adjacent to each other in the vertical direction and in the horizontal direction. A pixel image 7L for the left eye is formed so as to be adjacent to each of the left and right sides of. In addition, the left-eye pixel images 7L are formed on the black portions 14 formed in the even-numbered columns and the odd-numbered rows so as to be adjacent to each other in the vertical direction and in the horizontal direction. The pixel images 7R for the right eye are formed so as to be adjacent to each other on the left and right.

The horizontal width l of the black portion 14 is slightly smaller than the horizontal width m of the portion corresponding to the black matrix image. Therefore, the black portion 14 has portions 14a on both sides in the horizontal direction that overlap the pixel image 7R or 7L. The vertical width n of the black portion 14 is equal to the vertical width of the portion corresponding to the black matrix image. Therefore, the black portion 14 is in contact with the adjacent pixel image 7R or 7L in the vertical direction.

The method of forming the black portion 14 will be described with reference to FIG.
As shown in (a), it may be formed by attaching carbon 15 to the surface of the diffusion sheet 13 by printing or the like, or as shown in FIG. 3 (b), a groove 16 is formed on the surface of the diffusion sheet 13. Alternatively, it may be formed by pouring the black ink 17 into the groove 16.

As described above, the pixel image formed on the diffusion sheet 13 is the right eye of the observer due to the image forming action of the lenticular plate arranged on the back side of the acrylic plate 12. The pixel information based on the pixel image 7R is recognized, and the left eye recognizes the pixel information based on the pixel image 7L for the left eye.
The lenticular plate has one column on which the right-eye pixel image 7R is formed and one-row on which the left-eye pixel image 7L is formed.
One stripe-shaped lenticular lens is formed for two rows and one row. Since the pixel image arrangements shown in FIGS. 1 and 2 are viewed from the side opposite to the viewer, the pixel image 7R for the right eye is located on the left side and the pixel image 7L for the left eye is It is located on the right side.

In the projection type stereoscopic image display device of the present embodiment as described above, the pixel image 7R formed on the diffusion sheet 13,
7L is vertically displaced from each other by ½ of the pixel pitch Pv, and since the light-shielding portions 14 are adjacent to each other on both sides, there is no overlapping portion. Further, both sides of the pixel images 7R and 7L are shielded by the portions 14a overlapping the pixel images on both sides of the black portion 14, and the pixel image 7 actually transmitted to the lenticular plate.
Since both ends 71R and 71L of R and 7L are located on a substantially straight line in the vertical direction, there is almost no portion where the left and right pixel images alternate, and there is no pixel image in the vertical direction. Disappears. Therefore, the observer recognizes the left and right pixel information as being sufficiently separated, and does not recognize the black display even when the observer moves.

In the above-described embodiment, the stereoscopic image display device of the twin-lens type in which the first liquid crystal projector 3a projects the pixel image for the left eye and the second liquid crystal projector 3b projects the pixel image for the right eye. However, in addition to this, for example, a four-lens type stereoscopic image display device, that is, images from the first and third viewpoints of the images from the four viewpoints are projected by the first liquid crystal projector, and The second and third viewpoint images
The present invention is also applicable to a lenticular lens in which the first to fourth pixel image rows are projected into one set to form a lenticular lens by the liquid crystal projector of FIG.

A parallax barrier may be used instead of the lenticular lens to separate the pixel information for the right eye and the pixel information for the left eye.

Further, the present invention is not limited to the stereoscopic image display device as described above, and two projectors are used to improve the resolution of the projected image, and each projector projects an image. The present invention can also be applied to a flat image display device in which pixel images are arranged on a screen as shown in FIG. 2, and adjacent pixel images can be sufficiently separated to provide a high-quality flat image. .

[0039]

According to the present invention, even when the first pixel image and the second pixel image are interleaved by using two projectors, the first pixel image and the second pixel image are displayed. There is no overlap between and, and the observer's left and right eyes recognize a high-quality stereoscopic image with the left and right image information completely separated, and even when the observer moves, a black display is recognized. It is possible to provide a projection type stereoscopic image display device that does not do so.

Further, according to the present invention, even when the first pixel image and the second pixel image are interleaved and displayed by using two projectors in order to increase the resolution, It is possible to provide a projection-type image display device that allows an observer to recognize a high-quality projected image by eliminating the overlapping portion with the second pixel image.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a diffusion plate of a projection type stereoscopic image display device of the present invention.

FIG. 2 is a diagram showing a pattern of a pixel image formed on a diffusion plate of the projection type stereoscopic image display device of the present invention.

FIG. 3 is a cross-sectional view showing a black portion formed on the diffusion plate of the projection type stereoscopic image display device of the present invention.

FIG. 4 is a diagram showing the principle of a stereoscopic image display device.

FIG. 5 is a diagram showing an overall configuration of a projection type stereoscopic image display device.

FIG. 6 is a diagram showing a pattern of pixel images formed on a diffusion plate of a conventional projection type stereoscopic image display device.

FIG. 7 is a diagram showing a pattern of pixel images formed on a diffusion plate of a conventional projection type stereoscopic image display device.

[Explanation of sign]

 3a 1st liquid crystal projector 3b 2nd liquid crystal projector 6 Lenticular screen 7R 1st pixel image 7L 2nd pixel image 11 Diffusion plate 12 Acrylic plate 13 Diffusion sheet 14 Black part (light-shielding part) 14a Overlapping part

Claims (7)

[Claims] 1. A first projector, a second projector, and the first,
The second projector projects and forms the first pixel image and the second pixel image, and separates the first and second pixel images into pixel information for the right eye and pixel information for the left eye. A projection type stereoscopic image display device comprising a screen, wherein a first pixel image row in which a first pixel image exists in the vertical direction via a black matrix image and a second pixel image are provided on the screen. Second existing vertically through the black matrix image
The pixel image columns of the
Image is formed with a shift of 1/2 of the pixel pitch in the vertical direction with respect to the first pixel image, and a light-shielding portion is formed in a portion of the screen where the black matrix image is located. A projection type image display device characterized by the above. 2. The light-shielding portion is larger than the black matrix image and has portions on both sides thereof overlapping the first or second pixel image, and one side of the light-shielding portion in the first pixel image row. The projection type image display apparatus according to claim 1, wherein the end portion and the other side end portion of the light shielding portion in the second pixel image row are positioned on a substantially straight line in the vertical direction. 3. The screen includes a diffusion plate on which first and second pixel images are formed, and the first and second pixel images as right eye pixel information and left eye pixel information. The projection type image display device according to claim 1 or 2, further comprising a separating means for separating, wherein the light shielding portion is formed on the diffusion plate. 4. The diffusion plate is a transparent plate to which a diffusion sheet is attached, and the light-shielding portion is formed on the diffusion sheet. Projection display device. 5. The first pixel image is a pixel image for the right eye, and the second pixel image is a pixel image for the left eye. 4. The projection-type image display device described in 4. 6. The first and second projectors, and the first and second projectors.
A video display device comprising a screen on which a first pixel image and a second pixel image are projected and formed by a second projector, wherein the first pixel image is vertically arranged in a black matrix. A first pixel image column existing through the image and a second pixel image column in which the second pixel image vertically exists through the black matrix image are alternately positioned in the horizontal direction, and The second pixel image is formed so as to be displaced by 1/2 of the pixel pitch in the vertical direction with respect to the first pixel image, and a light shielding portion is formed in a portion of the screen where the black matrix image is located. A projection-type image display device characterized in that 7. The light-shielding portion is larger than the black matrix image and has portions on both sides thereof overlapping the first or second pixel image, and one side of the light-shielding portion in the first pixel image row. 7. The projection display apparatus according to claim 6, wherein the end portion and the other side end portion of the light shielding portion in the second pixel image row are located on a substantially straight line in the vertical direction.