JPH0643320A - Polarization control plate and display system - Google Patents

Abstract

PURPOSE:To provide every kind of application by enabling the polarizing characteristic of a polarizating filter plate to be easily converted. CONSTITUTION:A polarization control plate in which the polarizing characteristic of the polarizating filter plate 11 is converted can be obtained by adhering a light transmissible sheet 13 on the polarizating filter plate 11 via an adhesive. The polarization control plate is arranged at the front of a liquid crystal display device on either one side of first and second liquid crystal display devices to irradiate optical images for righ and left channels, and one screen on which a video from the first and second liquid crystal display devices can be image- formed is arranged at the front of the liquid crystal display device on the other side, and the video on the screen can be observed as a stereoscopic vision.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polarization system, and is particularly effective when optical polarization is performed by a simple means to obtain, for example, a stereoscopic projection type image.

[0002]

2. Description of the Related Art There is a technique for controlling a light transmission state using a polarizing plate. For example, Japanese Patent Application No. 62-
No. 254173. This technique can be used to display a stereoscopic image using a polarization filter. However, this display system tends to increase in size because it uses a cathode ray tube as an image source.

As a display device that can be used as a video source,
Recently, a projection type liquid crystal display device using a liquid crystal panel has been developed. As a liquid crystal display device, a method of enlarging and projecting a color video
There is a method in which the images are separated into three primary color images of G and B, and each of them is enlarged and projected.

Two liquid crystal display devices are required to obtain a stereoscopic image using the liquid crystal display device. However, the problem here is that the output image of the liquid crystal display device is already polarized in a certain direction. For this reason, when the images of the left and right channels are projected on the screen by the two liquid crystal display devices and the projected images are viewed with the polarized glasses, the image of one of the channels becomes invisible and stereoscopic viewing becomes impossible. is there. This is because the left and right channel images projected from the two liquid crystal display devices are polarized in the same direction, whereas the left and right polarizing plates of the polarizing glasses have the polarization characteristics in the horizontal and vertical directions. is there.

[0005]

As described above, the left and right channel images output from two conventional liquid crystal display devices and polarized in the same direction are projected on a screen and viewed through polarizing glasses. In that case, stereoscopic vision is impossible. Therefore, an object of the present invention is to provide a polarization control plate capable of correcting the polarization characteristics by a simple means. Another object of the present invention is to provide a display system using the above polarization control plate.

[0006]

According to the present invention, a light transmissive sheet is attached to a surface of a polarizing plate facing the light traveling direction by a light transmissive adhesive to correct the polarization characteristics of the polarizing plate. . Further, according to the present invention, the first and second liquid crystal display devices for irradiating the optical images for the left and right channels, and the liquid crystal display device disposed on the front surface of one of the liquid crystal display devices, are arranged in the light traveling direction of the polarization filter plate. A polarization control plate having a structure in which a light-transmissive transparent sheet is pasted on the surface facing the body with a light-transmissive adhesive, a front surface of this polarization control plate and a front surface of the other liquid crystal display device, and the first and The second liquid crystal display device has one scooter on which an image is formed.

[0007]

According to the first means, the polarization characteristics of the polarization filter plate can be modified with an extremely simple structure.

According to the second means, the images of the left and right channels on the screen from the two liquid crystal display devices can be stereoscopically viewed by the polarized glasses having different left and right polarization characteristics.

[0009]

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

FIG. 1 shows a basic embodiment of the present invention. In FIG. 1A, reference numeral 11 denotes a polarization filter plate having polarization characteristics in a fixed direction, for example, a vertical direction. A light transmission sheet 13 is attached to the surface of the polarization filter plate 11 facing the light traveling direction Z by a light transmission adhesive 12 to form a polarization control plate. FIG. 1B shows a general polarization filter 15. This polarizing filter plate 1
When non-polarized light is radiated in the direction of arrow Z with respect to 5 and the polarized glasses 16 are seen from the position in the figure, the light is incident on the right eye (dark).
Instead, light is incident (bright) only on the left eye. The polarization filter plate 15 has horizontal polarization characteristics, the right filter 16R of the polarization glasses 16 has vertical polarization characteristics, and the left filter 16L has horizontal polarization characteristics. Here, if the polarization control plate 16R 'according to the present invention is used as the right filter, as shown in FIG. 7C, the light also enters (lights) the right eye. In the figure, the X mark means that light cannot be seen, and the circle mark means that light can be seen.

As described above, the polarization control plate of the present invention has a function of converting the polarization direction of polarized light from the horizontal direction to the vertical direction or from the horizontal direction to the vertical direction, that is, the function of correcting the polarization characteristic. Moreover, its manufacture is extremely simple, and it can be realized simply by attaching a sheet to the light incident surface of the polarizing filter plate via an adhesive.

FIG. 2 is a diagram for explaining the principle of a stereoscopic display device using a polarization control plate. Now, it is assumed that the right channel image light PR and the left channel image light PL from the image source have, for example, horizontal polarization characteristics as shown in FIG.
Further, it is assumed that this stereoscopic image is viewed with the polarizing glasses 16 having the right filter 16R (vertical polarization characteristic) and the left filter 16L (horizontal polarization characteristic). In this system, the image light PL of the left channel is easily transmitted through the polarization filter plate 21 having the horizontal polarization characteristic and is output as the horizontally polarized image light HPL. Therefore, the horizontally polarized image light HPL passes through the left filter 16L and can be seen by the left eye.
However, since the horizontally polarized image light HPL cannot pass through the right filter 16R having the vertical polarization characteristic, it does not enter the right eye. On the other hand, the image light P of the right channel
R can pass through the polarization control plate 22, which is a main part of the invention. The polarization control plate 22 is a polarization control plate made of a polarization filter plate having vertical polarization characteristics, and has a polarization direction different from the polarization direction of the left channel polarization filter plate 21. Therefore, the image light transmitted through the polarization control plate 22 is
It has been converted into vertically polarized image light VPR. Therefore, the vertically polarized image light VPR passes through the right filter 16R and can be seen by the right eye. However, since it cannot pass through the left filter 16L having the horizontal polarization characteristic,
It never hits the left eye.

As described above, by using the polarization control plate 22, even if the left and right channels are image lights having the same polarization direction (for example, horizontal direction), the polarization glasses 16 independently provide the left and right channel image lights. Can be guided to the left and right eyes respectively. If the polarization control plate 22 were not provided, in the illustrated example, the image of the right channel would enter the left eye and not the right eye, and stereoscopic viewing would be impossible.

In FIG. 3, a stereoscopic image is projected on a screen 33 by using a liquid crystal projector 31L for irradiating a left channel image and a liquid crystal projector 31R for irradiating a right channel image, and the stereoscopic image is stereoscopically viewed by the stereoscopic glasses 16. System. In this system, for example, the image projected from the liquid crystal projectors 31R and 31L is the second image.
As shown in the figure, for example, it has a horizontal polarization characteristic. In such a case, the principle shown in FIG. 2 is applied to this system. That is, the image emitted from the liquid crystal projector 31R of the right channel is the polarization control plate 32.
Is projected onto the screen 33 via. Polarization control plate 32
Is a polarization control plate made of a vertical polarization filter plate.

With such a simple means, when the user views the image on the screen 33 through the stereoscopic glasses 16,
The images of the left and right channels are accurately incident on the left and right eyes, respectively. In this embodiment, as the liquid crystal projectors 31L and 31R, existing ones can be used, and the liquid crystal projector need not be improved. Further, as the polarization control plate 32, it suffices to attach a transparent adhesive sheet to the vertical polarization filter plate, which can be carried out at an extremely low cost. As a simple experiment method, the principle of the present invention can be understood by preparing two polarizing filter plates and attaching a commercially available transparent adhesive tape to one of them to conduct an experiment.

The present invention is not limited to the above embodiment. In the above embodiment, the liquid crystal projector 3
The image lights emitted from 1L and 31R have horizontal polarization characteristics, the polarization control plate 32 is made of a filter plate having vertical polarization characteristics, and the polarization glasses have right polarization characteristics on the right side and horizontal polarization characteristics on the left side. However, the image light emitted from the liquid crystal projector is vertically polarized, the polarization control plate is made of a filter plate with horizontal polarization characteristics, and the polarized glasses have horizontal polarization characteristics on the right side and vertical polarization characteristics on the left side. Good. FIG. 4A shows in principle an example of the configuration of the polarization control plate 22b and the polarization glasses 16b when the left and right image lights PL and PR are lights having vertical polarization characteristics. Further, FIG. 4B shows the polarization control plate 2 when the polarization control plate 22c is provided in the left optical path.
In principle, an example of a combination of 2c and polarizing glasses 16c is shown. Further, the principle of the present invention can be similarly applied even if the image light has a polarization characteristic in an oblique direction.

In the above embodiment, the polarization control plate 22 is arranged in front of the magnifying lens 51, as shown in FIG. 5A, in order to utilize the existing liquid crystal projector. That is, in FIG. 5A, reference numeral 51 is a light source, and the light from the light source 51 is reflected by the reflection plate 52, and the liquid crystal display plate 5
Irradiate to 3. The image light output from the liquid crystal display plate 53 is magnified by the magnifying lens 54. The polarization control plate 22 is arranged in the optical path of this magnified image light. However, the arrangement position of the polarization control plate 22 is as shown in FIG.
It may be arranged between the liquid crystal display plate 53 and the magnifying lens 54. Further, in the above-described embodiment, the left and right channel image lights are shown as one type for the sake of clarity, but a liquid crystal projector that outputs R, G, and B image lights separately. Is 3 of R, G, B
Outputs different types of image light. Therefore, in this case, the R, G, and B of the left or right channel that is the target of polarization control
The polarization control will be performed on the output image light. Further, as the means for attaching the polarization control plate, various embodiments are possible, and it is also possible to attach it to the protective glass or the like on the front surface of the liquid crystal display device.

The present invention is not limited to the above embodiment. The above embodiment is an example in which the polarization filter plate and the polarization control plate are used in parallel. However, the polarization control plate may be partially used as a part of the polarization filter.

FIG. 6 shows an example in which a partial shutter is constructed using the polarization control plate of the present invention. As shown in FIG. 9A, the first polarization filter plate 61 converts the light into horizontally polarized light V
When the polarization control plate 62 having a partial polarization conversion portion 62a is used as a base, the user selects an area 6 corresponding to the polarization conversion portion 62a.
Only the light from 3 can be seen. Other area 64
Light is cut off and becomes black. When the polarization control plate 62 is rotated by 90 ° from this state, the same figure (B)
Then, the light from the area 64 can be seen, and the light in the area 63 is cut off. This cut-off effect is not complete, according to experiments,
Most of the light is attenuated in the area 63. Therefore,
A shutter device can be obtained by utilizing this principle.

FIG. 7 shows an example in which the shutter device of FIG. 6 is used. In FIG. 7A, a plurality of questions are displayed on the left side of the area 71 and a plurality of answers are displayed on the right side of the area 71 by the liquid crystal display, and the central area 72 is hidden. When the polarization control plate is rotated by 90 °, the area 72 can be seen and the line connecting the question and the answer can be confirmed as shown in FIG.

[0021]

As described above, according to the present invention,
The polarization characteristics can be modified by simple means, and a display system using a polarization control plate can be obtained.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing the basic principle of the present invention.

FIG. 2 is a diagram for explaining the basic idea of the stereoscopic display device of the present invention.

FIG. 3 is a diagram showing an embodiment of a stereoscopic display device of the present invention.

FIG. 4 is an explanatory diagram showing the basic principle of another embodiment of the present invention.

FIG. 5 is a diagram showing still another embodiment of the present invention.

FIG. 6 is an explanatory view showing the basic principle of still another embodiment of the present invention.

FIG. 7 is an explanatory diagram showing a usage example of another embodiment of the present invention.

[Explanation of symbols]

11 ... Polarizing filter plate, 12 ... Light transmissive adhesive, 13 ...
Light transmitting filter, 15 ... Polarizing filter plate, 16 ... Polarizing glasses, 22 ... Polarization control plate.

Claims (6)

[Claims] 1. A polarization control plate having a structure in which a light-transmissive sheet is attached to the surface of the polarization filter plate facing the light traveling direction with a light-transmissive adhesive. 2. A first liquid crystal display device and a second liquid crystal display device for irradiating optical images for the left and right channels, and the liquid crystal display device arranged on the front surface of either one of the liquid crystal display devices in the light advancing direction of the polarizing filter plate. A polarization control plate having a structure in which a light-transmissive transparent sheet is attached to the facing surface with a light-transmissive adhesive, and the polarization control plate is disposed on the front surface of the polarization control plate and the front surface of the other liquid crystal display device. 2. A display system, comprising: one scoop on which an image from the liquid crystal display device of No. 2 is formed. 3. A polarization control plate having a structure in which a light-transmissive transparent sheet is attached to the surface of the first polarization filter plate facing the light traveling direction by a light-transmissive adhesive, and the polarization direction of the polarization filter plate. And a second polarization filter plate arranged in parallel with the polarization control plate so that the polarization directions are different from each other by about 90 °, and an optical image for the left and right channels on the polarization control plate and the second polarization filter plate. A polarization control system comprising: 4. A liquid crystal display device in which the polarization control plate is disposed includes a liquid crystal display plate and a magnifying lens system that magnifies an image projected from the liquid crystal display plate, and the polarization control plate includes the liquid crystal display plate and the magnifying lens. The display system according to claim 2, wherein the display system is arranged between lens systems. 5. The liquid crystal display device on which the polarization control plate is disposed has a protective glass on the front surface thereof, and the polarization control plate is attached to the protective glass. Display system. 6. A polarization control plate having a structure in which a light-transmissive sheet is attached to the surface of the first polarization filter plate facing the light traveling direction by a light-transmissive adhesive, and the polarization control plate is disposed so as to overlap with the polarization control plate. And a second polarization filter plate, and a shutter structure in which the light transmission of the polarization control plate section is turned on and off by switching the rotation angle between the second polarization filter plate and the second polarization control plate. .