Liquid crystal display device

A technology of liquid crystal display device and liquid crystal display element, which is applied to identification devices, static indicators, optics, etc., can solve problems such as difficulty in reducing contrast ratio, easy blackening of displayed images, and blurred vision.

Inactive Publication Date: 2004-09-29
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the actual viewing angle characteristics in the positive viewing angle direction are opposite to those in the negative viewing angle direction, it is difficult to uniformly suppress the decrease in contrast in the vertical direction even if the optical retardation fil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0113] (Example 1)

[0114] In this embodiment, as shown in FIG. 6, a measurement system equipped with a light receiving element 21, an amplifier 22, and a recording device 23 was used to measure the viewing angle dependence of the liquid crystal display device. The liquid crystal cell 16 of the liquid crystal display device is arranged such that the surface 16a on the side of the glass substrate 9 is located on the reference plane x-y of the orthogonal coordinates xyz. The light receiving element 21 is an element capable of receiving light at a certain three-dimensional light receiving angle, and is arranged at a predetermined distance from the origin of the coordinates in a direction that forms an angle Φ (view angle) with the z direction perpendicular to the surface 16a.

[0115]During the measurement, the liquid crystal cell 16 installed in the measurement system was irradiated with monochromatic light having a wavelength of 550 nm from the surface opposite to the surface 16a....

Example Embodiment

[0131] (Example 2)

[0132] In this example, seven samples #11 to #17 were prepared. In the samples, the alignment films 11 and 14 of the liquid crystal cell 16 of the liquid crystal display device of FIG. Name), as the liquid crystal layer 8, a liquid crystal material with a pretilt angle of 2.0°, 4.0°, 6.0°, 8.0°, 14.0°, 15.0°, 16.0° relative to the above-mentioned alignment films 11, 14 is used, and the cell thickness ( The thickness of the liquid crystal layer 8) is 5 μm. The first division portion 8a: the second division portion 8b of the liquid crystal layer 8 are assumed to be 17:3.

[0133] The pretilt angles of these samples #11~#17 were measured by preparing a homogenizing unit in which the materials of the samples #11~#17 were injected and using the NSMAP-3000LCD pretilt angle measuring device (manufactured by Sigma Optical Equipment Co., Ltd.) Measured.

[0134] As the optical retardation films 2 and 3 of the samples #11 to #17, the same optical retardation films 2 and...

Example Embodiment

[0201] (Example 3)

[0202] In this example, three samples #21 to #23 were prepared. In the samples, the alignment films 11 and 14 of the liquid crystal cell 16 of the liquid crystal display device of FIG. Name), as the liquid crystal layer 8 (segment ratio 17:3), the pretilt angle with respect to the alignment films 11, 14 is 6°, and the refractive index anisotropy Δn(550) at a wavelength of 550nm is set to For the liquid crystal materials of 0.070, 0.080, and 0.095, the cell thickness (thickness of the liquid crystal layer 8) is 5 μm.

[0203] In addition, the pretilt angle was measured by preparing a homogenous cell in which the materials of samples #21 to #23 were injected, and measuring it with an NSMAP-3000 pretilt angle measuring device.

[0204] As the optical retardation films 2 and 3 of the samples #21 to #23, the same optical retardation films 2 and 3 in which the disco liquid crystal was oriented obliquely as in Example 1 were used.

[0205] The above-mentioned samples...

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Abstract

The purpose of the invention is to provide a liquid crystal display device for displaying images of high quality which not only eliminates the inversion in, but also removes the phase difference associated with the viewing angle, inversion of gradation is not caused in the direction out of the viewing angle. To achieve this goal, at least one sheet of optical phase difference plates 2, 3 is inserted between a pair of polarizing plates 4, 5 on both sides of said liquid crystal display device. Partitioning the liquid crystal display layers with different ratios and orient them in each anisotropic direction; Furthermore, when a pretilt angle is defined as the angle between the major axis of the liquid crystal molecule and the orienting film, the pretilt angle on the liquid crystal layer is controlled to such a range that when a voltage near the threshold voltage of the liquid crystal is applied to produce a medium tone display state, inversion of gradation is not caused in the direction out of the viewing angle.

Description

technical field [0001] The present invention relates to a liquid crystal display device, especially a liquid crystal display device in which the viewing angle dependence of a display screen is improved by combining an optical retardation plate with a liquid crystal display element. Background technique [0002] In the past, liquid crystal display devices using nematic liquid crystal display elements were widely used in digital segment display devices such as clocks and desktop electronic calculators, but recently they are also used in word processors, notebook personal computers, and automotive LCD TVs. Wait. [0003] A liquid crystal display element generally has a light-transmitting substrate, and electrode lines and the like for turning on and off pixels are formed on the substrate. For example, in an active matrix liquid crystal display device, active elements such as thin film transistors are formed on the above-mentioned substrate together with the above-mentioned ele...

Claims

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Application Information

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IPC IPC(8): G02F1/133G02F1/1335G02F1/13363G02F1/1337G09F9/35
CPCG02F1/133753G02F2413/10G02F1/133632G02F1/133634
Inventor 山原基裕水繁光
Owner SHARP KK
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