JP2010134394A - Stereoscopic display using guest-host liquid crystal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the following problems; there are defects regarding a system for obtaining a stereoscopic view in a direct-viewing type, thin-shaped display while wearing glasses. <P>SOLUTION: 1. The display is constituted of a backlight and two guest-host liquid crystal cells, right and left images are independently displayed on the liquid crystal cells, and the right and the left images are separately viewed through the right and the left polarizing glasses perpendicular to the right and the left images, then, the stereoscopic view is obtained. 2. A 1/4 wavelength plate is bonded on the surface of the display, and the right and the left images are made reverse-circularly polarized beams, then, the right and the left images are separately viewed through the reverse-circularly polarizer glasses, then, the stereoscopic view is obtained. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

Detailed Description of the Invention

  The present invention relates to a stereoscopic display using two stacked GH liquid crystal cells and polarized glasses.

There are the following methods for obtaining stereoscopic vision using glasses on a direct-view and thin display.
1. A method in which polarizing plates that are orthogonal to each other are bonded to the even and odd lines of the display image, and polarized glasses that are orthogonal to each other are used. 1. A method in which the emitted light of the image is circularly polarized light in opposite directions, and circular polarized glasses whose directions are opposite to each other are used. 2. Method using plasma display and shutter glasses 3. Method using liquid crystal display panel and shutter glasses. An iZ3D system that forms a display by overlapping a backlight, a TN liquid crystal display panel, and a TN liquid crystal cell, and stereoscopically displays using polarized glasses

Problems to be solved by the invention

1, 1 'method: Vertical resolution is reduced by half. A ghost is generated when the viewing position is moved up and down.
Method 2: Large size, large number of people. It is not suitable as a computer display due to the size of the pixels. Some ghost remains.
Method 3: The ghost is conspicuous because the response speed of the liquid crystal is slow.
Method 4: There are many drawbacks such as ghost, coloring phenomenon, image quality degradation when viewed from an oblique angle, blur, contrast degradation, and contour effect.

Means for solving the problem

This invention is made | formed in view of this subject, Comprising: The subject which said system has with the following structures is solved at a stretch.
1. A display is composed of a backlight and two guest-host type liquid crystal cells, and left and right images are independently displayed on the liquid crystal cell, and the left and right images are separated by right and left polarizing glasses to obtain a stereoscopic view.
2. A 1/4 wavelength plate is stretched on the surface of the display, and the left and right images are respectively circularly polarized in opposite directions, and the left and right images are separated by circularly polarized glasses in opposite left and right directions to obtain a stereoscopic view.

  FIG. 1 is a schematic diagram of the present invention. The structure is composed of a backlight (1), a rear GH liquid crystal cell (2), a moire preventing diffusion plate (3), a front GH liquid crystal cell (4), and polarized glasses (5). The polarization axis of the GH liquid crystal cell is orthogonal to the front surface and the rear surface. In the figure, as an example, the polarization axis of the rear GH liquid crystal cell is set to + 45 °, and the right image is displayed here. The front GH liquid crystal cell has a polarization axis of −45 ° and displays a left image. Polarized glasses right (5R) has a polarization axis orthogonal to the right image and visualizes the image. However, the left image is transparent because the polarization axis is parallel and is not visualized as an image. Similarly, the left image of the polarized glasses left (5L) is also visualized.

  This will be described more specifically with reference to FIG. As an example, assume that a white disk is displayed in front of the screen on a black background. When the right image (2R) is displayed on the rear GH liquid crystal cell, the polarization axis (2P) indicates + 45 ° except for the disc. In the disk portion, the dichroic dye is perpendicular to the surface and does not show polarized light. The left image (4L) is displayed on the front GH liquid crystal cell. Except for the disk, the polarization axis (4P) is −45 °, and the disk is non-polarized. When these pictures are viewed through the left and right polarized glasses, an image orthogonal to the polarization axis (5L ', 5R') is visualized, so that a left eye image (6L) and a right eye image (6R) are obtained.

  FIG. 3 shows a configuration obtained by developing the present invention. In other words, the light emitted from the display is not a linearly polarized light that is orthogonal, but a left-handed and right-handed circularly-polarized light. When a quarter wave plate is attached to the surface of the display described above with the angle of the polarization axis and the slow axis set at 45 °, the linear polarization of the left image and the right image is left-handed circularly polarized light (8L) and right-handed, respectively. Converted to circularly polarized light (8R).

  These circularly polarized light is separated into right and left images by circularly polarized glasses and stereoscopically viewed. Here, circularly polarized glasses will be described. The left and right circularly polarizing plates are formed by laminating a quarter wavelength plate and a linear polarizing plate with an angle between the polarization axis and the slow axis being 45 °. When the left-handed circularly polarized light (8L) in the left image passes through the quarter-wave plate (9a), it is converted into linearly polarized light and visualized perpendicular to the polarizing plate (9c). The right-handed circularly polarized light (8R) in the right image passes through as it is and is not visualized. The right-handed circularly polarized light (8R) in the right image is similarly visualized by the right circularly polarizing plates (9b, 9d). This method is easy to use because it does not affect the separation of the left and right images even if the face is tilted, so that no ghost occurs.

  The GH type liquid crystal is a nematic liquid crystal mixed with a dichroic dye, for example, about 2%. The elongated liquid crystal molecules and the elongated dichroic dye molecules are considered to be aligned in parallel, and thus are expected to move in the same manner as the liquid crystal molecules. FIG. 4 shows the movement of the dichroic dye in the GH liquid crystal. When the dichroic dye is aligned in the alignment direction and parallel to the electrode surface (no electric field), it shows polarized light, but becomes non-polarized as it becomes vertical (when an electric field is applied). An OCB (Optically Compensated Bend) liquid crystal has a bend structure and a vertical structure with respect to ON / OFF of the voltage, and has a high response speed. Generally, when a dye is mixed in a liquid crystal, the viscosity increases and the response speed becomes slow. However, the problem can be overcome by combining the liquid crystal and the structure having a fast response speed.

  As a color display method, a method generally used in a conventional color liquid crystal display panel, that is, an RGB color filter, a TFT drive, or the like is adopted. The dichroic dye used in the GH liquid crystal must be black.

The invention's effect

The present invention produces the following effects.
1. There are few shortcomings in the stereoscopic viewing method using glasses with a thin direct view.
2. It can be used as a general image display device without glasses.
3. Since the left and right pictures are displayed independently on the two liquid crystal cells, the vertical resolution does not deteriorate.
4). The method using circularly polarized glasses does not cause ghosts due to the tilt of the face.
5). There is no ghost problem with LCD and shutter glasses.
6). The arithmetic circuit which iZ3D system has is not required, and the problem accompanying it does not occur.
7). By using the OCB liquid crystal technology as the liquid crystal material and driving method, a practical response speed can be secured even for the GH type.

  Configuration of stereoscopic viewing method using GH liquid crystal (1)   Disc displayed in front of the screen   Configuration of stereoscopic viewing method using GH liquid crystal (2)   Movement of dichroic dye in GH liquid crystal

Explanation of symbols

1. Backlight 2. Rear GH liquid crystal cell 2R. Right image 2P. Displayed on the rear GH liquid crystal cell. Polarization axis (+ 45 °)
3. 3. Moire prevention diffusion plate Front GH liquid crystal cell 4L. Left image 4P. Displayed on front GH liquid crystal cell. Polarization axis (-45 °)
5). Polarized glasses 5L. Left 5R. Right 6L. Left eye image 6R. Right eye image 7.1 / 4 wavelength plate 8L. Left-handed circularly polarized light (left image)
8R. Right-handed circularly polarized light (right image)
9. Circular polarized glasses 9a. 1/4 wavelength plate 9b. 1/4 wavelength plate 9c. Polarizing plate (-45 °)
9d. Polarizing plate (+ 45 °)
10. Electrode 11. Alignment film 12. Dichroic dye

Claims (3)

  A backlight and two GH (Guest Host) liquid crystal cells are overlapped to form a display. A left image is displayed on one of these GH liquid crystal cells and a right image is displayed on the other, and their polarization axes are orthogonal to each other. A stereoscopic display that obtains a stereoscopic view by separating left and right images with right and left polarizing glasses orthogonal to each other.   The above-mentioned stereoscopic display in which an image is displayed on a rear GH liquid crystal cell and a general image can be displayed using the front GH liquid crystal cell as a polarizing plate.   A stereoscopic display in which a quarter-wave plate is placed on the surface of the display and converted into left-handed and right-handed circularly polarized light, and this is obtained using one of the left-handed and one of the right-handed circularly polarized glasses.

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