JPH09297361A - Liquid crystal stereoscopic display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a luminance adjustable liquid crystal stereoscopic display device which is made compact. SOLUTION: By arranging a λ/2 plate 204, the depth direction of the device is reduced. And also, luminance liquid crystal panels 109 and 209 are arranged in the same optical unit and color liquid crystal panels 108 and 208 are arranged in the same optical unit. By individually adjusting lamps 101 and 201, the brightness of a luminance image and the brightness of a color image are individually adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention includes, for example, an optical unit in which a luminance image optical system and a color image optical system are separated.
The present invention relates to a liquid crystal stereoscopic display device configured by using the two.

[0002]

2. Description of the Related Art FIG. 9 shows a side view and a perspective view of a liquid crystal display device. In a conventional liquid crystal display device, an optical unit 163 is built in a cabinet 162. The light emitted from the optical unit 163 is reflected by the reflection mirror 161 and projected on the screen 120. FIG. 10 is a diagram showing an internal configuration of the optical unit 163. Lamp 1
The light generated at 01 is reflected by the reflector 102 and illuminates the front surface. The light emitted from the reflector 102 enters the separating polarization beam splitter 103. The light that has entered the separating polarization beam splitter 103 is separated into S waves and P waves whose polarization directions are orthogonal to each other. The P wave passes through the separating polarization beam splitter 103. S
The wave is reflected by the polarizing plate of the separating polarization beam splitter 103. The S wave output from the polarization beam splitter 103 for separation is reflected by the reflection mirror 106,
The light enters the color liquid crystal panel 108. The S wave incident on the color liquid crystal panel 108 is converted into a P wave and enters the combining polarization beam splitter 110. On the other hand, the P wave that has passed through the polarization beam splitter 103 for separation is reflected by the reflection mirror 107 and enters the luminance liquid crystal panel 109. The P wave that has entered the brightness liquid crystal panel 109 is converted into an S wave and enters the combining polarization beam splitter 110. In the combining polarization beam splitter 110, the P wave and the S wave are combined and output to the projection lens 111. The projection lens 111 irradiates the screen with the combined image. Further, the signal processing circuit 99 receives the color signals of R, G, B and drives the color liquid crystal panel 108 (R signals, G signals, B signals) and the brightness liquid crystal panel 10.
A luminance signal (Y signal) for driving 9 is output. In the configuration shown in FIG. 10, since the light output from the lamp 101 and the light projected from the projection lens 111 are parallel, the distance L1 from the lamp 101 to the projection lens 111 cannot be shortened.

FIG. 11 shows "Display Technology Series".
FIG. 3 is a configuration diagram of an optical system of the projection type stereoscopic display device shown on page 118 of “3D Display” (Masuda, Sangyo Tosho). The projection type stereoscopic display device shown in FIG. 11 uses two liquid crystal panels. The light from the light source is separated by the separating polarization beam splitter 103 into P waves and S waves whose polarization directions are orthogonal to each other. The P wave and the S wave are applied to the left-eye liquid crystal panel 804 and the right-eye liquid crystal panel 806, respectively. Left eye liquid crystal panel 804 and right eye liquid crystal panel 806
A drive signal for displaying a binocular parallax image is input to each of the two, and the P wave and the S wave are modulated by the drive signal. The modulated light is combined by the polarization beam splitter 11 for synthesis.
They are combined by 0 and output to the quarter-wave plate 807. The P wave and the S wave, which are orthogonal to each other by the quarter-wave plate, are adjusted so that their optical axes are ± 45 degrees and are output. By passing through the quarter-wave plate, the P wave and S wave are converted into clockwise and counterclockwise circularly polarized light, and the projection lens 8
08 onto the screen. As the stereoscopic eyeglasses in this case, left-handed and right-handed circularly polarized glasses in which a quarter-wave plate and a polarizing plate are combined are used.

[0004]

As described above, the conventional liquid crystal display device or liquid crystal stereoscopic display device has a drawback that the optical system is complicated and the size of the optical unit becomes large. Further, since a stereoscopic image is displayed using one light source, there is a problem that the light amount cannot be flexibly adjusted.

The present invention has been made to solve the above problems, and an object thereof is to reduce the size of a liquid crystal stereoscopic display device. Also, at low cost,
An object of the present invention is to provide a liquid crystal stereoscopic display device that provides a high-luminance image.

[0006]

A liquid crystal stereoscopic display device according to the present invention includes a first right eye image processing a first image for a right eye first image.
An image optical system, a second image optical system for the right eye that processes the second image for the right eye, a first image optical system for the left eye that processes the first image for the left eye, and a second image for the left eye A second image optical system for the left eye, the first image optical system for the right eye, the second image optical system for the right eye, the first image optical system for the left eye, and the second image optical system for the left eye. One of the two optical systems is set as one set, and one optical unit is provided, and a 1 / n wave plate is provided in each optical path of the set of optical systems.

The optical system includes a separating polarization beam splitter, a liquid crystal panel, and a combining polarizing beam splitter. It is a half-wave plate provided in the optical path.

The optical system includes a polarization beam splitter for separation, a liquid crystal panel, and a polarization beam splitter for synthesis. The 1 / n wave plate is two quarter wavelength plates provided on the exit side of the liquid crystal panel. It is characterized in that it is a one-wave plate.

A liquid crystal stereoscopic display device according to the present invention comprises a first image optical system for the right eye which processes the first image for the right eye, and a second image optical system for the right eye which processes the second image for the right eye. ,
A first image optical system for the left eye that processes the first image for the left eye, and a second image optical system for the left eye that processes the second image for the left eye, and the first image optical system for the right eye, First for left eye
One set of image optical systems is one optical unit, and one set of the second image optical system for the right eye and the second image optical system for the left eye is one optical unit.

The liquid crystal stereoscopic display device is further characterized in that a quarter-wave plate is provided on each of the emission sides of both optical units.

The first image optical system for the right eye produces a luminance image for the right eye, the second image optical system for the right eye produces a color image for the right eye, and the first image optical system for the left eye produces the left eye. Is generated, and the second image optical system for the left eye is configured to generate a color image for the left eye.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1. FIG. 1 is a diagram showing a configuration of a liquid crystal stereoscopic display device according to the present invention. In FIG. 1, the Y system indicates a luminance image optical system, and includes a separating polarization beam splitter (PBS) 103, a λ / 2 plate 105, and a reflecting mirror 10.
7, a liquid crystal panel 109 for brightness, and a polarization beam splitter (PBS) 110 for synthesis. Also, FIG.
In FIG. 1, the C system indicates a color image optical system, and for example, a polarization beam splitter (PBS) 103 for separation, λ
/ 2 plate 104, reflection mirror 106, color liquid crystal panel 108, combining polarization beam splitter (PBS) 110
It is composed of The above-mentioned Y system and C system form one set and constitute one optical unit. In this liquid crystal stereoscopic display device, as shown in FIG. 1, the two types of luminance image (first image) / color image (second image) separation processing optical system are used as one optical unit. It is configured. In order to form an image for the right eye, a liquid crystal panel for brightness is placed on one optical unit and a liquid crystal panel for color is placed on the other optical unit. Then, in order to form an image for the right eye, the same polarized light output from the brightness liquid crystal panel and the color liquid crystal panel is used to project the image on the screen. The stereoscopic spectacles used in this liquid crystal stereoscopic display device use polarizing plates whose transmission axes are left and right shifted by 90 degrees.

FIG. 2 is a diagram showing the structure of the left optical unit shown in FIG. That is, FIG. 2 is a diagram showing one optical unit including a Y system and a C system. In FIG. 2, for the same components as those shown in the conventional example,
The same reference numerals are given and the description thereof is omitted here. The points that are particularly different from the conventional one will be described below. In the configuration shown in FIG. 2, the polarization beam splitter 103 for separation is used.
The λ / 2 plate 104 is inserted between the reflection mirror 106 and the reflection mirror 106. A λ / 2 plate 105 is inserted between the separating polarization beam splitter 103 and the reflecting mirror 107.
The λ / 2 plate 104 and the λ / 2 plate 105 change the polarization direction of light to 9
It is rotated by 0 degrees. The polarization beam splitter 103 for separation and the polarization beam splitter 110 for synthesis have polarizing plates that pass P waves and reflect S waves as in the conventional case. The color liquid crystal panel 108 and the brightness liquid crystal panel 109 are normally white liquid crystal panels.

Next, the operation will be described. Lamp 10
The light emitted from the reflector 1 and the reflector 102 is incident on the polarization beam splitter 103 for separation. The incident light is separated into S wave and P wave. The λ / 2 plate 104 converts the P wave into the S wave. The S wave is reflected by the reflection mirror 106 and enters the color liquid crystal panel 108. Light incident on the color liquid crystal panel 108 is converted from S waves to P waves. The P wave enters the combining polarization beam splitter 110. On the other hand, the S wave separated by the separating polarization beam splitter 103 enters the λ / 2 plate 105 and is converted into a P wave. The P wave is reflected by the reflection mirror 107 and enters the brightness liquid crystal panel 109. Luminance liquid crystal panel 10
The P wave incident on 9 is converted into an S wave. The S wave enters the combining polarization beam splitter 110. In the combining polarization beam splitter 110, the P wave and the S wave are combined and output to the projection lens 111.

By inserting the λ / 2 plate 104 and the λ / 2 plate 105, the P wave is converted into the S wave or the S wave is converted into the P wave. Therefore, the lamp 101 and the reflector 1
The irradiation direction of the light emitted from 02 can be made orthogonal to the projection direction of the light projected by the projection lens 111. That is,
The positions of the lamp 101 and the reflector 102 can be arranged in the lateral width direction. Therefore, the depth length L2 of the entire device can be reduced.

FIG. 3 is a diagram showing another structure of the optical unit. 3 differs from FIG. 2 in that λ / 2 plate 104 and λ
This is the arrangement position of the / 2 plate 105. In FIG. 3, λ /
The 2 plate 104 and the λ / 2 plate 105 are the color liquid crystal panel 1
08 and the liquid crystal panel 109 for brightness are arranged in the light emission direction. Also in the configuration shown in FIG. 3, the length L2 in the depth direction of the device can be reduced.

FIG. 4 is a diagram showing another structure of the optical unit. 4 is different from FIG. 3 in that the λ / 4 plate 112a,
112b and λ / 4 plates 113a and 113b are arranged. The operation will be described with reference to FIG. The brightness liquid crystal panel 109 includes a polarization filter 301, a liquid crystal panel 302, and a polarization filter 303. The polarization filter 301 passes the S wave. The polarization filter 303 allows the P wave to pass. λ / 4 plate 113a and λ /
The 4th plate 113b rotates the polarization direction of light by 45 degrees. In the case shown in FIG. 5A, the polarization filter 303
And the λ / 4 plate 113a are separated from each other. In the case shown in FIG. 5B, the polarization filter 303 and the λ / 4 plate 113a are combined. FIG. 5 (a)
In the case of (1), when light is emitted into the atmosphere, reflected light B1, reflected light B2, and reflected light B3 are generated. Reflected light B
1, reflected light B3 is light that enters the liquid crystal panel 302 from the back side and causes crosstalk. Therefore, it is desirable that the reflected light B1 and the reflected light B3 are not present.
In the case shown in FIG. 5B, the polarization filter 303 and the λ / 4
Since the plate 113a is coupled, the generation of the reflected light B1 and the reflected light B3 can be suppressed as much as possible by making the refractive indexes of the polarization filter 303 and the λ / 4 plate 113a equal.
On the other hand, in the case of FIGS. 5A and 5B, the λ / 4 plate 1
Since light is emitted from the air 13a into the atmosphere, reflected light B2 is generated. However, the reflected light B2 becomes light that has passed through the λ / 4 plate 113a twice, and thus becomes light that has been rotated by 90 degrees.
That is, the P wave becomes an S wave and enters from the back side of the luminance liquid crystal panel 109. The polarization filter 303 is P
Since the wave is transmitted and the S wave is blocked, the reflected light B2 is blocked by the polarization filter 303. Therefore,
The brightness liquid crystal panel 109 is not affected by the reflected light B2. As shown in FIG. 5B, the λ / 4 plate 113b
To the polarization beam splitter 110 for synthesis, and
It is desirable to minimize the reflected light of the plate 113b.
Providing the λ / 4 plate 113a and the λ / 4 plate 113b has the same function as providing one λ / 2 plate, and instead of the λ / 2 plate, Even when two λ / 4 plates are placed, the same operational effect as in FIG. 3 is obtained.

As described above, according to this embodiment,
The total length of the optical unit (depth from the projection lens) can be shortened, and the liquid crystal display device becomes thin and compact. Also,
The back surface reflected light that causes crosstalk can be reduced.

In the example shown in FIGS. 1 to 5, the color image optical system is composed of one color liquid crystal panel 108, but three liquid crystal panels for R, G and B are used. Even if it is equipped with. In addition, the G image is divided into two images G1 and G2, the G1 image is generated as a first image by the brightness liquid crystal panel 109, and the G2, R, and B images are second images. Alternatively, the color liquid crystal panel 108 may be used.

As described above, the liquid crystal stereoscopic display device according to this embodiment provides a low cost and high brightness liquid crystal stereoscopic display device because it uses a two-element type luminance image / color image separation processing optical system. You can Further, since the λ / 2 plate is arranged on the incident side or the emitting side of the liquid crystal panel, the polarized light can be rotated by 90 degrees, the depth of the optical system can be reduced, and a compact liquid crystal stereoscopic display device is provided. can do. Furthermore, instead of the λ / 2 plate, two λ / 4 plates are used.
By arranging the plate on the emission side of the liquid crystal panel, it is possible to reduce the reflected light that causes a stroke.

Embodiment 2 FIG. FIG. 6 is a diagram showing a liquid crystal stereoscopic display device of the present invention. The configuration shown in FIG. 6 is different from the configuration shown in FIG. 1 in that the luminance images for the right eye and the left eye (first
(Image) Two optical systems are combined into one optical unit. Another point is that the two color image (second image) optical systems for the right eye and the left eye are combined into one optical unit. That is, two liquid crystal panels for brightness are provided in one optical unit, and two liquid crystal panels for color are provided in another optical unit. With this configuration, the light amount of the color image optical system and the light amount of the luminance image optical system can be adjusted separately. A color filter is usually used in the color liquid crystal panel, and the intensity of light output from the color liquid crystal panel is weaker than the light amount of the luminance liquid crystal panel. Therefore, the light quantity of the color image optical system can be increased by increasing the output of the lamp in which the color image optical system is arranged. On the contrary, when the light amount of the luminance image optical system is not required so much, the power consumption can be reduced by lowering the output of the lamp of the optical unit in which the luminance image optical system is arranged.

Embodiment 3 FIG. FIG. 7 is a diagram showing another example of the liquid crystal stereoscopic display device according to the present invention. The configuration shown in FIG. 7 is different from the configuration shown in FIG. 6 in that the λ / 4 plate 13
0,230 is provided. A λ / 4 plate is placed after the exit surfaces of the combining polarization beam splitters 110 and 210. In this case, the stereoscopic eyeglasses are those in which a λ / 4 plate is arranged on the screen side of the eyeglasses and a polarizing plate is placed on the eye side of the eyeglasses. Alternatively, a λ / 4 plate which is shifted left and right by 90 degrees or a transmission axis of the polarizing plate which is shifted by 90 degrees is used. By arranging the λ / 4 plate after the exit surface of the polarization beam splitter in this way, the image is stereoscopically viewed even when the screen is viewed from a direction slightly rotated with respect to the optical axis on the screen. Can be seen in.
In FIG. 8, the λ / 4 plates 130 and 230 are arranged on the exit side of the projection lens. The same effect as that of FIG. 7 described above is obtained. Note that λ / 2 shown in FIGS. 6, 7, and 8
The plate need not be inserted when there is a margin in the depth direction of the device. In that case, each optical unit has a configuration as shown in FIG.

[0023]

As described above, according to the present invention, the size of the liquid crystal stereoscopic display device can be reduced.

The brightness can be adjusted separately for the color image optical system and the luminance image optical system.

Further, according to the present invention, the image can be viewed three-dimensionally even when the screen is viewed from an oblique direction.

[Brief description of drawings]

FIG. 1 is a diagram showing a liquid crystal stereoscopic display device of the present invention.

FIG. 2 is a diagram showing a configuration of one optical unit of the present invention.

FIG. 3 is a diagram showing another configuration of one optical unit of the present invention.

FIG. 4 is a diagram showing another configuration of one optical unit of the present invention.

FIG. 5 is a diagram showing an operation of the configuration shown in FIG. 4 of the present invention.

FIG. 6 is a diagram showing a configuration of a liquid crystal stereoscopic display device according to another embodiment of the present invention.

FIG. 7 is a diagram showing a configuration of a liquid crystal stereoscopic display device according to another embodiment of the present invention.

FIG. 8 is a diagram showing another configuration of the liquid crystal stereoscopic display device of the present invention.

FIG. 9 is a diagram showing a conventional liquid crystal display device.

FIG. 10 is a diagram showing a configuration of a conventional liquid crystal display device.

FIG. 11 is a diagram showing a configuration of a conventional liquid crystal stereoscopic display device.

[Explanation of symbols]

99 signal processing circuit, 101 lamp, 102 reflector, 103 polarization beam splitter for separation (PB
S), 104, 105 λ / 2 plate, 106, 107 reflection mirror, 108 color liquid crystal panel, 109 brightness liquid crystal panel, 110 synthetic polarization beam splitter (PBS), 111 projection lens, 112a, 112
b, 113a, 113b λ / 4 plate, 120 screen, 130 λ / 4 plate, 161 reflection mirror, 162
Cabinet, 163 optical unit, 201 lamp, 202 reflector, 203 polarization beam splitter (PBS) for separation, 204, 205 λ / 2 plate, 2
06, 207 reflection mirror, 208 color liquid crystal panel, 209 brightness liquid crystal panel, 210 composite polarization beam splitter (PBS), 211 projection lens, 23
0 λ / 4 plate.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Teruo Miyamoto 2-3-3 Marunouchi, Chiyoda-ku, Tokyo Sanryo Electric Co., Ltd. (72) Inventor Toshiyuki Yoneda 2-3-3, Marunouchi, Chiyoda-ku, Tokyo Ryoden Co., Ltd. (72) Inventor Yasuhito Nai 2-3-3, Marunouchi, Chiyoda-ku, Tokyo Sanryo Electric Co., Ltd. (72) Toshimasa Tomoda 2-3-2, Marunouchi, Chiyoda-ku, Tokyo Sanryo Electric Co., Ltd.

Claims (6)

[Claims] 1. A first image optical system for the right eye, which processes a first image for the right eye, a second image optical system for the right eye, which processes a second image for the right eye, and a first image for the left eye. A first image optical system for the left eye and a second image optical system for the left eye that processes a second image for the left eye, and the first image optical system for the right eye and the second image optical system for the right eye. And any one of two optical systems, the first image optical system for the left eye and the second image optical system for the left eye, are set as one optical unit, and n optical paths are provided in each optical path of the optical system of one set. A liquid crystal stereoscopic display device comprising the one-wave plate of 2. The optical system includes a polarization beam splitter for separation, a liquid crystal panel, and a polarization beam splitter for synthesis, and the 1 / n wave plate includes a polarization beam splitter for synthesis and a polarization beam splitter for synthesis. The half-wave plate provided in the optical path between the two.
The liquid crystal stereoscopic display device described. 3. The optical system includes a polarization beam splitter for separation, a liquid crystal panel, and a polarization beam splitter for synthesis, and the 1 / n wave plate includes two sheets provided on the exit side of the liquid crystal panel. The liquid crystal stereoscopic display device according to claim 1, wherein the liquid crystal stereoscopic display device is a quarter-wave plate. 4. A first image optical system for the right eye that processes a first image for the right eye, a second image optical system for the right eye that processes a second image for the right eye, and a first image for the left eye. A first image optical system for the left eye, and a second image optical system for the left eye that processes a second image for the left eye, and the first image optical system for the right eye and the first image optical system for the left eye. Is a single optical unit, and the second image optical system for the right eye and the second image optical system for the left eye are a group to form one optical unit. 5. The liquid crystal stereoscopic display device according to claim 1, wherein the liquid crystal stereoscopic display device further comprises a quarter-wave plate on the emission side of each of the optical units. . 6. The right-eye first image optical system generates a right-eye luminance image, the right-eye second image optical system generates a right-eye color image, and the left-eye first image optical system 6. The liquid crystal stereoscopic display device according to claim 1, wherein a left-eye luminance image is generated, and the left-eye second image optical system generates a left-eye color image.