Liquid crystal aligning agent, liquid crystal aligning film and liquid crystal display device

A technology of liquid crystal alignment agent and carbon number, applied in liquid crystal materials, instruments, optics, etc., can solve the problems of general products without structure and inconvenience
CN101935533AInactive Publication Date: 2011-01-05JNC CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
JNC CORP
Publication Date
2011-01-05
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention relates to a liquid crystal aligning agent, a liquid crystal aligning film and a liquid crystal display device. To improve display quality of the liquid crystal display device, the ion density of important characteristics required to the liquid crystal aligning film can be enumerated. If the ion density is high, the voltage applied to the liquid crystal in a frame period will be reduced, as a result, the lighteness will be reduced to bring obstruction to normal greyscale display. In addition, even if an initial ion density is low, a condition that the ion density (long-term reliability) is increased after a high-temperature acceleration test is not optimized. The ion density of the liquid crystal display device formed by using the liquid crystal aligning agent is low, and the long-term stability of the liquid crystal display device is excellent. The liquid crystal aligning agent contains a polyamic acid obtained by reacting a specific diamine containing piperazine rings in molecules or a mixture containing the diamine and other diamine with at least two tetracarboxylic acid dianhydrides at a temperature from 70 to 200 DEG C.
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Description

technical field

[0001] The present invention relates to a liquid crystal alignment agent comprising polyamic acid (polyamic acid) obtained by reacting diamine and tetracarboxylic dianhydride. Furthermore, the present invention also relates to a liquid crystal alignment film obtained from the liquid crystal alignment agent and a liquid crystal display element including the liquid crystal alignment film. Background technique

[0002] Liquid crystal display devices are used in various liquid crystal displays such as viewfinders of video cameras and projection displays, represented by monitors of notebook computers and desktop computers. Among display devices, recently, it is also used in televisions. Furthermore, liquid crystal elements are also used in optoelectronics-related elements such as optical printer heads, optical Fourier transform elements, and light bulbs.

[0003] Various elements are known in the liquid crystal display element, and the technical development of t...

Claims

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