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Liquid crystal display device and material for alignment film

A technology of liquid crystal display devices and alignment films, applied in optics, instruments, nonlinear optics, etc., can solve problems such as bright spots, wiring insulation damage, etc.

Inactive Publication Date: 2016-03-30
JAPAN DISPLAY INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The rubbing method has the following problems: the generation of bright spots due to the cutting chips of the alignment film during rubbing, and the insulation breakdown of wiring due to static electricity generated during the rubbing process.
[0005] On the other hand, for liquid crystal display devices, viewing angle characteristics are a problem

Method used

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  • Liquid crystal display device and material for alignment film
  • Liquid crystal display device and material for alignment film
  • Liquid crystal display device and material for alignment film

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Embodiment 1

[0032] The present invention can be applied to all liquid crystal display devices using photo-alignment. Hereinafter, the present invention will be described by taking an IPS liquid crystal display device as an example, but for example, a TN (Twisted Nematic, twisted nematic) liquid crystal display device or a VA (Virtual Alignment, vertical alignment) liquid crystal display device may also be used.

[0033] figure 1 It is a cross-sectional view of an IPS liquid crystal display device. figure 1 The TFT in FIG. 1 is a so-called top-gate TFT, and LTPS (Low Temperature Poly-Silicon, low-temperature polysilicon) is used as the semiconductor used. On the other hand, when an a-Si semiconductor is used, a so-called bottom-gate TFT is often used. In the following description, the case of using a top-gate TFT will be described as an example, but the present invention can also be applied to a case of using a bottom-gate TFT.

[0034] figure 1 Among them, the first base film 101 (for...

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Abstract

A liquid crystal display device including an alignment film which has been optically aligned is configured that the liquid crystal has negative dielectric anisotropy, an absolute value of which is equal to or smaller than 5. The alignment film is subjected to an optical alignment process to exhibit the optical alignment property, and includes a first film located at a side in contact with the liquid crystal, and a second film below the first film, which is not optically aligned to have no alignment property. The alignment film is formed by applying a mixture of a first material for forming the first film and a second material for forming the second film to the substrate. The first material for the alignment film accounts for 10 wt. % or more and less than 40 wt. % of a total weight of the first and the second materials.

Description

[0001] This application claims priority based on Japanese Patent Application JP2014-191318 filed on September 19, 2014 and Japanese Patent Application JP2015-118453 filed on June 11, 2015, the contents of which are incorporated by reference This article. technical field [0002] The present invention relates to a display device, and more particularly to a liquid crystal display device having an alignment film using photo-alignment. Background technique [0003] In the liquid crystal display device, a TFT substrate and a counter substrate facing the TFT substrate are arranged, liquid crystal is sandwiched between the TFT substrate and the counter substrate, and pixels are formed in a matrix on the TFT substrate, and the pixels have Pixel electrodes and thin film transistors (TFTs). Also, an image is formed by controlling light transmittance based on liquid crystal molecules on a pixel-by-pixel basis. [0004] In a liquid crystal display device, it is necessary to initially ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1337
CPCG02F1/133711G02F1/133788G02F1/133723G02F1/13712G02F1/133719
Inventor 广田武德兵头洋祐国松登富冈安园田英博
Owner JAPAN DISPLAY INC