JPS63316037A - Stereoscopic video display device - Google Patents

Abstract

PURPOSE:To prevent three-dimensional feeling from lost and to prevent a strange feeling from occurring because the video does not appear as the deviation of polarization angle between a screen and polarization spectacles at the time of viewing from the position of an angle out of the center axis of the screen by viewing a stereoscopic video obtained by composing two video lights through polarization spectacles having different circular polarization directions right and left. CONSTITUTION:The titled device installs two video light sources (cathode-ray tubes 1 and 2, circular polarization filters 8 and 9 and a half mirror 3), which induces two video light which can be viewed by superposed each other by executing the circular polarization in different turning directions and stereoscopic video obtained by composing two video lights can be viewed through the polarization spectacles 15 and 16 having different circular polarization directions right and left. Since it is circular polarization, the video is not the deviation of polarization angle even if the visual axis of the polarization spectacles 15 and 16 deviate from the center axis of the screen, so that the video is viewed as a nearly complete stereoscopic video. The video can be viewed as the favorable stereoscopic video even if it is viewed from a direction deviated from the center of the screen.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a stereoscopic image display device.

[Summary of the invention]

Two image lights are circularly polarized in different directions of rotation, and the combined stereoscopic image is viewed using polarized glasses with different directions of circular polarization on the left and right sides.When viewed from a position offset from the center axis of the screen, linear polarization This is a stereoscopic image display device that prevents the loss of stereoscopic effect or the occurrence of a strange feeling due to the deviation of the polarization angle between the image light source and the polarized glasses.

[Conventional technology]

It is equipped with two video light sources and one video compositing surface, each of which sends out images shot by two cameras with different viewing angles, and directs two video lights with different polarization angles from each video light source toward the video compositing surface. Three-dimensional image display devices have been put into practical use that combine images into a single image on a transmission and image compositing plane.

Three-dimensional image display devices that have been put into practical use can be roughly divided into projector systems and cathode ray tube systems.The projector system uses a screen as an image synthesis surface, and the cathode ray tube system uses a half mirror as an image synthesis surface.

In these three-dimensional image display bags, by attaching linear polarizing filters with polarization angles different by 90 degrees to each image light source, the polarization angles of the two image lights sent to the image synthesis surface are set by 90 degrees to each other.
°They are different. That is, a horizontal/vertical polarization method in which a horizontal polarizing filter is attached to one image light source and a vertical polarizing filter is attached to the other image light source, or a +45° polarizing filter and a -45° polarizing filter are respectively attached to each image light source. +45°/-45° polarization method is adopted.

In order to view the combined image as a stereoscopic image, the user wears polarized glasses that have left and right polarizing filters corresponding to each polarization direction. In other words, for example, if a horizontal polarizing filter is attached to the video light source that transmits the image of the left camera, and a vertical polarizing filter is attached to the video light source that transmits the image of the right camera, the horizontal polarizing filter is attached to the left eye side of the polarized glasses. A polarizing filter and a vertical polarizing filter are used on the right eye side.

[Problem that the invention seeks to solve]

In order to view a linearly polarized image using a linear polarizing filter as a good stereoscopic image, it is necessary to match the polarization of the polarized glasses by 50 degrees to the polarizing filter attached to each image light source. In order to optimally adjust the polarization angle, the composite image must be viewed from the front. Therefore, if a large number of people view the composite image, if the viewer deviates from the front, it will not be possible to see a good stereoscopic image.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide a stereoscopic image that can be viewed as a good stereoscopic image even when viewed from a direction shifted from the center of the screen.

[Means for solving problems]

The stereoscopic image display device of the present invention uses two image light sources (a cathode ray tube 1.2 in FIG. 1, a circularly polarizing filter 8.9, consisting of half mirror 3).

This is a configuration in which a three-dimensional image is viewed by combining the above two image lights through polarized glasses (15, 16) with different circularly polarized directions on the left and right sides.

[Effect]

Since it is circularly polarized light, even if the visual axis of the polarized glasses 15, 16 deviates from the central axis of the screen, there will be no deviation in the polarization angle, and the image will be seen as a completely 3D image.

〔Example〕

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

This stereoscopic image display device uses two cathode ray tubes 1 and 2 as image light sources, and combines the two image lights with a half mirror 3. Each cathode ray tube 1, 2 is the front surface 3a of the half mirror 3.
They are arranged symmetrically on the side and the rear surface 3b side, respectively. Second
As shown in the figure, each cathode ray tube 1, 2 has its display surface 1a.
, 2a are tilted upward at about 45 degrees and are faced to each other with a half mirror 3 in between.

The half mirror 3 transmits half of the incident light and reflects the other half. Therefore, when viewing from the front side 3a of the half mirror 3, the display surface la can be seen directly through the half mirror 3, and the display surface 2a reflected by the half mirror 3 can also be seen. Rear surface 3b of half mirror 3
When viewed from the side, on the contrary, the user sees the display surface 2a directly and also sees the reflective screen of the display surface 1a. Since each cathode ray tube 1.2 is arranged symmetrically with respect to the half mirror 3, the directly viewed display surface 1a (2a) and the reflected display surface 2a (la) overlap and appear as one.

Since the image reflected by the half mirror 3 appears reversed left and right, the polarity of the deflection is changed, for example, by reversing the horizontal scanning of the cathode ray tube 2 from right to left toward the screen. As a result, a normal composite image of the two screens 1a and 2a of the cathode ray tubes 1 and 2 can be viewed from the front side 3a of the half mirror 3.

Also, from the rear surface 3b@ of the half mirror 3, there is a cathode ray tube 1.
In both cases, you can see a composite image with the left and right sides reversed.

As shown in FIG. 3, a polarizing filter is attached in front of the display surfaces 1a, 2a to polarize the image light sent out from each display surface 1a, 2a.In this embodiment, a circularly polarizing filter 8 is used as the polarizing filter. The zero circular polarizing filter 8.9 using .9 is a filter that spirally polarizes the amplitude of the vibration wave of light toward the path of the light, and is a right circular polarizing filter whose polarization direction is right-handed. There is a left-handed circularly polarizing filter that rotates the polarization direction to the left.

As shown in FIG. 3, the direction of rotation of the circularly polarized light beam is reversed when it is reflected by the half mirror 3. That is, for example, the display surface 1a
, 2a are both right-handed circularly polarizing filters. In this case, the image light 12 sent out from the display surface 1a and the image light 13 sent out from the display surface 2a both travel toward the half mirror 3 while rotating to the right (in a right-handed screw direction). From the front surface 3a side of the half mirror, right-turning transmitted light 12a sent from the display surface 1a and passing through the half mirror 3, and the display surface 2a
The left-turning reflected light 13b transmitted from the mirror 3 and reflected by the half mirror 3 will be seen.

On the other hand, from the rear surface 3b side of the half mirror, reflected light 12b of the left-turning light sent out from the display surface 1a and reflected by the half mirror 3, and right-turning light 12b sent out from the display surface 2a and passing through the half mirror 3 are reflected. The transmitted light 13a will be seen.

The images displayed on the screens 1a and 2a are not exactly the same images (for example, as shown in FIG. Therefore, when viewing from the front surface 3a side of the half mirror 3, the polarized glasses 15 are used, in which the left-turning polarizing filter 15L is provided for the right eye, and the right-turning polarizing filter 15R is provided for the left eye. Therefore, the left eye sees only the image from the left camera 5 (swiveled to the right) displayed on the display surface 1a, and the right eye sees only the image displayed on the display surface 2a and the half mirror 3.
Only the image reflected from the right camera 4 (turning to the left) can be seen, and the displayed composite image can be viewed as a three-dimensional image.

On the other hand, when viewing from the rear surface 3b side on the opposite side, the left-handed rotating polarizing filter 16L (right eye) and the right-handed rotating polarizing filter 16R (
For the left eye), polarized glasses 16, which are exactly the same as the glasses 15 described above, are used. When viewed from the rear surface 3b side, display surface 2
The image of the right camera 4 (turning to the right) displayed on screen 1a and reflected by the half mirror 3 is viewed with the left eye, and the image of the left camera 5 (swiveled to the right) displayed on the display surface 1a and reflected by the half mirror 3 is viewed with the left eye.
Left turn) will be seen with the right eye. However, the composite image seen from the rear surface 3b is horizontally reversed as described above, and the image seen by the right camera 4 looks like an image seen from the left camera 5 side due to electrical horizontal reversal, and the image seen by the left camera 5 is reversed horizontally. Image seen - 10J
<ta Due to image inversion, it looks like an image seen from the right camera 4 side. Therefore, although the left and right images are reversed, the three-dimensional effect (
(perception of depth) looks correct.

That is, the stereoscopic image display device of this embodiment uses image light 12.13.
Since the light is circularly polarized, the composite image can be viewed using the same polarized glasses 15 and 16 whether viewed from the front side 3a or the rear side 3b of the half mirror 3. In addition, the polarizing filters 8 and 9 attached to the front surfaces of the cathode ray tubes 1 and 2 may be the same filters whose polarization direction is, for example, right-handed.' Note that when conventional linear polarizing filters are used, the front surface 3a of the half mirror 3 It is necessary to use polarized glasses with the left and right polarization angles reversed when viewing from the side and when viewing from the rear surface 3b side, and polarizing filters with different polarization angles are required in front of the cathode ray tubes 1 and 2.

In order to view the synthesized image as a stereoscopic image using a linear polarizing filter as in the past, it is necessary to match the polarization angle of the image almost perfectly with the polarization angle of the polarized glasses so that no angular deviation occurs. There is.

Therefore, it is necessary to view the composite image from directly in front at eye level, and as the viewing position deviates from directly in front, the angular deviation in the polarization angle increases.

When the two cathode ray tubes 1 and 2 are oriented obliquely upward as in this embodiment, and the linear polarizing filter 17a is attached as in the conventional case to view a composite image, if the viewing position deviates from directly in front, the angle will shift. Even if the cathode ray tube l is arranged with the display surface 1a facing diagonally upward, when viewed directly from the front, the horizontal or vertical polarization angle of the screen will change as shown in Figure 4. As the viewing angle of the zero display surface 1a that matches the polarized glasses 17 deviates from the central axis of the screen, as shown in FIG. In the case of linearly polarized light, there will be a deviation in the polarization angle, so if an angle deviation occurs, the image light that should only enter the right eye will also enter the left eye, and the image light that should only enter the left eye will also enter the right eye, creating a three-dimensional effect. decreases rapidly. However, with circularly polarized light, even if the visual axis of polarized glasses is slightly twisted, it will not appear as a deviation in the polarization angle, so even if viewed from a direction far away from the center of the screen, the image will look strange and the image quality will deteriorate. There are few
Therefore, as shown in this embodiment, two cathode ray tubes 1 and 2 are used.
are placed facing each other to provide a wide viewing angle in the horizontal direction (between line segments 26a and 26b and between line segments 27a and 2 in Figure 1).
7b)) is particularly effective.

Note that when configuring a stereoscopic image display device using the projector 20 as shown in FIG. 5, since the image synthesis surface is a screen (not shown), one image light source 21 and the other image light source 22 ( Polarizing filters having different polarization directions are attached to each of R1G and R1B (consisting of image light transmitting sections R1G and B, respectively). That is, for example, a left-handed circularly polarizing filter 23 is attached to the image light source 21, and a right-handed circularly polarizing filter 24 is attached to the image light source 22.
Install.

When configuring a stereoscopic image device with two cathode ray tubes and a half mirror as shown in Figure 1, one of the cathode ray tubes may be placed horizontally, and the other cathode ray tube may be placed directly above or below. Alternatively, two cathode ray tubes may be arranged horizontally so as to be perpendicular to each other.

〔Effect of the invention〕

As described above, the present invention allows a composite 3D image created by two image light sources circularly polarized in different rotation directions to be viewed with polarized glasses with left and right rotation directions different from each other, so that the image can be viewed from an angular position off the center axis of the screen. At this time, there will be no deviation in the polarization angle between the screen and the polarized glasses, and no loss of stereoscopic effect or discomfort will occur. Therefore, a stereoscopic video display device that can be viewed by a large number of people can be obtained.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a stereoscopic image system showing an embodiment of the present invention, FIG. 2 is a side view of the stereoscopic image display device, FIG. 3 is a perspective view for explaining the rotation direction of each image light, Figure 4A is a front view showing the cathode ray tube viewed from the front, Figure 4B
5 is a perspective view of the cathode ray tube viewed from an angle, and FIG. 5 is a perspective view of the projector. In addition, in the symbols used in the drawings, 1.2...--...------- Braun tube 3-------------- Half mirrors 8, 9...-...Circular polarizing filters 12, 13...--Image light 1
5, 16...---1...Polarized glasses.

Claims (1)

[Scope of Claims] It is equipped with two image light sources that circularly polarize and derive two image lights that can be viewed by superimposing each other in different rotation directions, and the two image lights are viewed through polarized glasses with left and right circular polarization directions different from each other. A three-dimensional image display device characterized by viewing a three-dimensional image by combining image lights.