JPH07294849A - Stereoscopic video display device - Google Patents

Abstract

PURPOSE:To provide a stereoscopic video display device in which the light beam from a light source is efficiently used and the luminance of a display screen is high. CONSTITUTION:The device consists of a light source 141, a barrier substrate 16 in which an opening section 16a that transmits the light beam from the source and a barrier section 16b that shields the light beam from the light source are alternatively formed and partially transmits the light beam from the light source and a liquid crystal panel 17 which is placed on the light- emitting side of the substrate 16 and a picture element L for a left eye and a picture element R for a right eye are alternatively formed. The light beam which passes the picture element L of the left eye of the panel 17 and the light beam which passes the picture element L for the left eye of the panel 17 and the light beam which passes the picture element R for the right eye are put into a separated condition and outputted to an observer's side. The section 16b of the substrate 16 is constituted by a reflective film 162 which reflects the light beam from the source 141 to the light source side and a reflective plate 142, which reflects the light beam that is reflected by the film 162 to the opposite side with respect to the substrate of the source 141, is placed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stereoscopic image display device capable of observing a stereoscopic image without using special glasses.

[0002]

2. Description of the Related Art Conventionally, a lenticular method or a parallax barrier method has been proposed as a method for displaying a stereoscopic image without using glasses.

The parallax barrier system is a system in which a parallax barrier having a slit is arranged in front of the display screen to generate parallax and obtain a stereoscopic image. FIG. 2 is a diagram illustrating the principle of a conventional parallax barrier type stereoscopic image display device.

On the display screen 1, left-eye pixels L having left-eye image information and right-eye pixels R having right-eye image information are alternately formed in the horizontal direction. In front of the display screen 1, a parallax barrier plate 2 in which openings 2a that transmit light from the pixels L and R and barrier portions 2b that shield the light are formed in a slit shape alternately in the horizontal direction. Are arranged.

Of the light emitted from the pixel L for the left eye, the light L1 directed to the left eye 3L of the observer passes through the opening 2a to reach the left eye 3L, and the light L2 directed to the right eye 3R is the barrier. It is shielded from light by the portion 2b. Of the light emitted from the pixel R for the right eye, the light R1 directed toward the right eye 3R of the observer passes through the opening 2a, reaches the right eye 3R, and travels toward the left eye 3L.
2 is shielded by the barrier portion 2b.

Therefore, only the light L1 from the pixel L for the left eye enters the observer's left eye 3L, and only the light R1 from the pixel R for the right eye enters the right eye 3R. At this time, the light L1 from the pixel L for the left eye and the light R1 from the pixel R for the right eye
Between and, there is parallax information enough for a human to perceive stereoscopically by binocular parallax. Therefore, the observer
You can watch 3D images.

However, in such a parallax barrier type stereoscopic image display device, the pixels L and R are
Since the light L2 and R2 from the light source is blocked by the barrier portion 2b, there is a problem that the amount of light incident on the left and right eyes 3L and 3R of the observer is small and the display screen becomes dark.

Further, in the lenticular type stereoscopic image display device, since the thickness of the lenticular lens is large, when the pixel pitch of the display screen becomes small, the proper viewing position where the light from the pixels is focused on the left and right eyes of the observer. There is a problem that is far from the display screen. Further, when the display screen is composed of a liquid crystal panel or the like having a black matrix portion, an area corresponding to the black matrix portion is also formed at the proper viewing position, so that the observer merely moves the head slightly. There is also a problem that the eyes are located in the area corresponding to the black matrix portion, the screen becomes dark, and a stereoscopic image cannot be seen.

As a stereoscopic image display device which solves the above problems, the applicant of the present application has proposed a device as shown in Japanese Patent Application No. 5-284810. FIG. 3 is a perspective view showing a schematic configuration of this stereoscopic image display device.

In the figure, 4 is a liquid crystal panel and 5 is a liquid crystal panel 4.
, A flat light source 6, a light emitting portion 7 of the flat light source 6,
Is a barrier substrate. As shown in FIG. 4, the barrier substrate 8 is provided with a reflective film 10 made of a highly reflective material such as Al on the surface of the transparent substrate 9 made of glass opposite to the plane light source 6 by sputtering, vapor deposition, ion plating, or the like. And the liquid crystal panel 4 is formed on the substrate 9.
A number of slits 11 are formed in parallel with the vertical pixel rows. The slit 11 is formed so that one slit 11 corresponds to two adjacent pixel columns in the vertical direction of the liquid crystal panel 4. That is, the slit 11 becomes the opening 8a, and the portion of the reflection film 10 located between the adjacent slits 11 becomes the barrier 8b.

As shown in FIG. 5, the slit panel 8 is closely attached to the light emitting portion 7 side of the flat light source 6 which is a cold cathode flat fluorescent lamp. The flat light source 6
Includes a pair of hollow cathodes 6d and 6d arranged at left and right positions in a hermetically sealed glass housing composed of a front panel 6a, a rear panel 6b and a frame glass 6c, and a fluorescent body 6e on the inner surface side of the front panel 6a and the rear panel 6b. , 6e are applied, and further mercury vapor and argon gas are filled in the hermetically sealed glass housing, and the mercury vapor in the glass housing is excited by causing discharge between the hollow cathodes 6d and 6d. Is irradiated with ultraviolet rays, and the fluorescent bodies 6e, 6 are emitted by the ultraviolet rays.
e is excited to emit light.

The light emitted from the flat light source 6 passes through the slit 11 and emits light in stripes. Of the light emitted from the flat light source 6, the light that hits the reflective film 10 is repeatedly reflected between the reflective film 10 and the fluorescent body 6d of the flat light source 6 and passes through the slit 11. . And
The striped light that has passed through the slit 11 reaches the liquid crystal panel 4.

As shown in FIG. 6, in the display pixels of the liquid crystal panel 4, left-eye pixels L and right-eye pixels R are alternately formed in the horizontal direction, and slits are formed from the flat light source 6. Of the light that passes through 11 and is emitted in stripes, the light 12L that has passed through the pixel L for the left eye enters the left eye 13L of the observer, and the light 12R that has passed through the pixel R for the right eye is the observer. Light enters at 13R.

Between the pixel L for the left eye and the pixel R for the right eye, there is parallax information that enables a human to perceive stereoscopically, and the binocular parallax caused by this causes the observer to recognize a stereoscopic image. To do.

In the stereoscopic image display device as described above, of the light emitted from the flat light source 6, the light striking the reflective film 10 is repeatedly reflected between the reflective film 10 and the fluorescent body 6d. , Passes through the slit 11 and reaches the liquid crystal panel 4. Therefore, the brightness of the display screen is high and excellent as compared with the conventional parallax barrier type stereoscopic image display device as shown in FIG.

However, even in this stereoscopic image display device, since the fluorescent material 6d has a low light reflectance and absorbs most of the light, most of the light repeatedly reflected is the fluorescent light. It is absorbed by the body 6d. Therefore, the light emitted from the flat light source 6 is not used sufficiently efficiently, and the problem that the brightness of the display screen is low still exists.

[0017]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks of the prior art, and provides a stereoscopic image display device capable of displaying a stereoscopic image by forming light from a light source into a stripe shape. An object of the present invention is to provide a stereoscopic image display device having a bright display screen by effectively utilizing light from a light source.

[0018]

In the stereoscopic image display device of the present invention, light sources, openings for transmitting light from the light sources, and barrier portions for shielding light from the light sources are alternately formed in the horizontal direction. And a barrier substrate that partially transmits the light from the light source and a light-transmitting side of the barrier substrate, in which pixels for the left eye and pixels for the right eye are alternately formed in the horizontal direction. A display panel of the type, wherein the light transmitted through the pixels for the left eye of the display panel and the light transmitted through the pixels for the right eye are emitted to the observer side in a separated state, The barrier section of the barrier substrate is made of a reflective material that reflects light from the light source to the light source side, and the light reflected by the barrier section is provided on the opposite side of the barrier substrate to the barrier substrate side of the light source. It is characterized in that a reflecting means for reflecting is arranged.

Further, in the three-dimensional image display device of the present invention, the reflective material and the reflecting means constituting the barrier portion are
It is characterized in that it is made of a highly reflective material such as 1 or Ag. Further, the stereoscopic image display device of the present invention is characterized in that the opening portion and the barrier portion of the barrier substrate have a stripe shape, and the light from the light source passing through the barrier substrate has a stripe shape. .

The stereoscopic image display device of the present invention is characterized in that a diffusion plate for diffusing light from the light source is disposed between the light source and the barrier substrate. Also, the stereoscopic image display device of the present invention is characterized in that an antireflection film is formed on a surface of the barrier substrate on the light emission side of the barrier substrate.

The stereoscopic image display device of the present invention is characterized in that the display panel is composed of a liquid crystal panel.

[0022]

According to the above construction, the light from the light source reflected by the barrier portion made of the reflective material of the barrier substrate is reflected by the reflecting means, and is repeatedly reflected between the barrier portion and the reflecting means, and finally, Passes through the opening. Therefore, most of the light from the light source finally reaches the display panel through the opening of the barrier substrate.

Further, the reflection material and the reflection means forming the barrier portion are made of a high reflection material such as Al or Ag, so that the attenuation of light during the repetition of the reflection is small, Most of the light from the light source reaches the display panel.

Further, the light from the light source is made into stripe light by the barrier substrate, so that the light passing through the pixels for the left eye and the light passing through the pixels for the right eye of the display panel are
Well separated.

Further, by disposing the diffusion plate between the light source and the barrier substrate, the light from the light source reaches the barrier substrate in a state of being diffused by the diffusion plate, and the intensity of the light depending on the position of the light source is alleviated. It Therefore, the shadow of the light source does not appear on the display screen.

Further, by providing the antireflection film on the light exit side surface of the barrier section, external light incident on the display panel from the observer side is not reflected and does not adversely affect the displayed image. A liquid crystal panel is suitable as the transmissive display panel.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a diagram showing the configuration of the stereoscopic image display device of this embodiment.

In the figure, the stereoscopic image display device of this embodiment comprises a light source device 14, a diffusion plate 15, a barrier substrate 16 and a liquid crystal panel 17. The light source device 14 is
It is composed of a light source 141 and a reflector 142 arranged on the opposite side of the light source 141 from the observer. The reflection plate 142 is formed by forming a reflection film 144 made of Ag, Al or the like on the inner surface (the surface on the light source 141 side) of a substrate 143 made of white resin by vapor deposition or the like. Ag has a reflectance of 0.95 and Al has a reflectance of 0.92, which is a substance having a higher reflectance than the white resin (having a reflectance of 0.7) forming the substrate.

The diffusion plate 15 is arranged on the observer side with respect to the light source device 14. The diffusing plate 15 is made of a prism sheet, frosted glass, or the like that diffuses the light from the light source 141 and absorbs little light, so that the observer does not see the shadow of the light source 141.

The barrier substrate 16 is disposed on the observer side of the diffusion plate 15, and a reflective film 16 made of Al, Ag or the like is formed on a part of the observer side surface of the transparent glass plate 161.
2 is formed in a stripe shape, and an antireflection film 163 of Cr or the like is formed on the reflection film 162. Accordingly, the glass plate 1 on which the reflective film 162 is not formed
Only 61 is the opening 16a that transmits light, and the part where the reflective film 162 is formed is the barrier 16b that blocks light.

The liquid crystal panel 17 includes the barrier substrate 1
The pixel L for the left eye and the pixel R for the right eye are formed alternately in the horizontal direction, being arranged closer to the viewer than 6 is.

Here, the positional relationship between the opening 16a and the left and right pixels L and R is such that there is one opening 16a for one set of left and right pixels L and R. In the stereoscopic image display device of this embodiment, of the light emitted from the light source 141, the light directed to the viewer side is diffused by the diffusion plate 15 and directed to the barrier substrate 16 side. Of these, the light directed to the opening 16a passes through the opening 16a and directly reaches the liquid crystal panel 17. Further, the light traveling toward the barrier portion 16b is reflected by the reflective film 16
2 is reflected by the light source device 14 side. Then, this light is reflected by the reflection film 144 of the light source device 14 and travels toward the barrier substrate 16 again. After that, the light directed to the opening 16a reaches the liquid crystal panel 17 through the opening 16a, and the light directed to the barrier 16b is reflected by the reflective film 162 and the reflective film 14.
4 and the light is repeatedly reflected until the light passes through the opening 16a.

Of the light emitted from the light source 141, the light traveling toward the reflector 142 side is reflected by the reflective film 144 and travels toward the barrier substrate 16 side. Then, similarly to the light emitted from the light source 141 and directed to the observer side, reflection is repeated many times between the reflective film 162 and the reflective film 144 until it passes through the opening 16a.

That is, the light emitted from the light source 141 is reflected by the reflection film 1.
Between the 62 and the reflection film 144, reflection is repeated many times until the light passes through the opening 14a. The reflective films 162, 1
Since 44 is formed of a film having a high reflectance such as Al or Ag, the light from the light source 141 is hardly absorbed when being reflected by the reflection films 162 and 144. For this reason,
The light emitted from the light source 141 directly passes through the opening 16a or is repeatedly reflected between the reflective films 162 and 144, and then passes through the opening 16a and reaches the liquid crystal panel 17. Therefore, most of the light emitted from the light source 141 efficiently reaches the liquid crystal panel 17.

Of the striped light that has passed through the opening 16a, the light 18L that passes through the pixel L for the left eye of the liquid crystal panel 17 enters the left eye 19L of the observer in the proper viewing position, and the light 18L It does not enter the eye 19R. In addition, the opening 16
Of the stripe-shaped light that has passed through a, the light 18R that passes through the right-eye pixel R of the liquid crystal panel 17 enters the right eye 19R of the observer at the proper viewing position and enters the left eye 19L. do not do.

Therefore, the observer in the proper viewing position is the left eye 1
In 9L, only the pixel L for the left eye is observed, in the right eye 19R, only the pixel R for the right eye is observed, and a stereoscopic image is recognized by binocular parallax.

As described above, in the stereoscopic image display apparatus according to the present embodiment, of the light emitted from the light source 141, the light blocked by the barrier portion 16b is also reflected by the barrier side reflection film 162 and the light source side reflection film 144. Light is repeatedly absorbed with little absorption between them, and finally reaches the liquid crystal panel 17 through the opening 16a. That is, most of the light emitted from the light source 141 reaches the liquid crystal panel 17 and is used as light for displaying a stereoscopic image, so that the brightness of the stereoscopic image becomes very high.

Further, the diffuser plate 1 is provided on the observer side of the light source 144.
5 is arranged, and the light from the light source 144 passes through the opening 16 a of the barrier substrate 16 and reaches the liquid crystal panel 17. Therefore, the shadow of the light source 144 does not appear on the display surface of the liquid crystal panel 17, and the image quality of the stereoscopic image does not deteriorate.

Further, the barrier portion 16 of the barrier substrate 16
Since the antireflection film 163 is formed on the surface of the reflection film 162 forming the b on the side of the observer, outside light entering the liquid crystal panel 17 side from the observer side is reflected again to the observer side. It is possible to suppress the movement and prevent the stereoscopic image from being adversely affected.

[0040]

According to the present invention, the defect of the stereoscopic image display device using the lenticular lens can be eliminated, and the light from the light source can be effectively used, and the stereoscopic image display device having a bright display screen is provided. You can

Further, according to the present invention, in addition to the effects described above, it is possible to provide a stereoscopic video display device capable of displaying a good stereoscopic video without displaying a shadow of a light source on the display screen.

Further, according to the present invention, in addition to the effects described above, it is possible to provide a stereoscopic image display device in which the adverse effect of external light incident on the display panel from the observer side is prevented.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration of a stereoscopic image display device of the present invention.

FIG. 2 is a diagram showing a principle of a conventional parallax barrier type stereoscopic image display device.

FIG. 3 is an exploded perspective view showing a configuration of a stereoscopic image display device that uses stripe light.

FIG. 4 is a perspective view showing a configuration of a barrier substrate of a stereoscopic image display device that uses light in a stripe shape.

FIG. 5 is a cross-sectional view showing a configuration of a stereoscopic image display device that uses stripe light.

FIG. 6 is a diagram showing the principle of a stereoscopic image display device that uses stripe light.

[Explanation of sign]

 L Pixel for left eye R Pixel for right eye 141 Light source 142 Reflective plate (reflecting means) 144 Reflective film 15 Diffuser 162 Reflective film (reflective material) 163 Antireflection film 16a Opening 16b Barrier 17 Liquid crystal panel

Claims (6)

[Claims] 1. A light source, an opening for transmitting light from the light source, and a barrier portion for blocking light from the light source are alternately formed in the horizontal direction, and the light from the light source is partially transmitted. A barrier substrate and a transmissive display panel that is disposed on the light-exiting side of the barrier substrate and in which pixels for the left eye and pixels for the right eye are alternately formed in the horizontal direction,
A stereoscopic image display device that emits light to an observer side in a state where light that has passed through pixels for the left eye of the display panel and light that has passed through pixels for the right eye are separated, and a barrier of the barrier substrate. And a reflecting means for reflecting the light reflected by the reflecting portion to the barrier substrate side on the side opposite to the barrier substrate of the light source. A stereoscopic image display device characterized by being arranged. 2. The three-dimensional image display device according to claim 1, wherein the reflection material and the reflection means forming the barrier portion are formed of a high reflection material such as Al or Ag. 3. The opening of the barrier substrate and the barrier portion are stripe-shaped, and the light from the light source passing through the barrier substrate is stripe-shaped. Stereoscopic image display device. 4. The stereoscopic image display device according to claim 1, wherein a diffusion substrate for diffusing light from the light source is arranged between the light source and the barrier substrate. 5. An antireflection film is formed on a surface of the barrier substrate on the light output side of the barrier substrate,
The stereoscopic image display device according to 2, 3, or 4. 6. The stereoscopic image display device according to claim 1, wherein the display panel is a liquid crystal panel.