Liquid crystal display device

一种液晶显示装置、液晶组合物的技术，应用在液晶材料、仪器、化学仪器和方法等方向，能够解决取向不均、电压保持率离子密度增加、白斑等问题，达到防止白斑、防止降低的效果

Active Publication Date: 2015-04-15
DIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] The present invention provides a method for preventing the reduction of the voltage holding ratio (VHR) and the increase of the ion density (ID) of the liquid crystal layer by using a specific liquid crystal composition and a color filter having a specific gradient parameter indicating the degree of aggregation of organic pigments, solving the problem of Liquid crystal display devices with display defects such as white spots, uneven orientation, and screen burn-in

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0214] The following examples are given to further describe the present invention in detail, but the present invention is not limited to these examples. In addition, "%" in the composition of a following Example and a comparative example means "mass %".

[0215] In the examples, the characteristics measured are as follows.

[0216] T ni : Nematic-isotropic liquid phase transition temperature (°C)

[0217] Δn: Refractive index anisotropy at 25°C

[0218] Δε: Dielectric constant anisotropy at 25°C

[0219] η: Viscosity at 20°C (mPa·s)

[0220] γ1: rotational viscosity at 25°C (mPa·s)

[0221] VHR: Voltage retention rate at 70°C (%)

[0222] (A liquid crystal composition is injected into a cell with a cell thickness of 3.5 μm, and the ratio of the measured voltage to the initial applied voltage when measured under the conditions of applying 5 V, a frame time of 200 ms, and a pulse width of 64 μs is expressed in %)

[0223] ID: ion density at 70°C (pC / cm 2 )

[0224] (Ion...

Synthetic example 1

[0240] Synthesis of Copolymer a

[0241] 100 parts of xylene was kept at 80°C in a nitrogen stream, and while stirring, 68 parts of ethyl methacrylate, 29 parts of 2-ethylhexyl methacrylate, 3 parts of thioglycolic acid, and a polymerization initiator ("PERBUTYL (registered trademark) O" [active ingredient tert-butyl peroxy 2-ethylhexanoate, manufactured by NOF Co., Ltd.]) 0.2 parts of the mixture was dripped over 4 hours. After completion of dripping, 0.5 part of "PERBUTYL (registered trademark) O" was added every 4 hours, and it stirred at 80 degreeC for 12 hours. After completion of the reaction, xylene was added to adjust the non-volatile content to obtain a xylene solution of the copolymer a having a non-volatile content of 50%.

Synthetic example 2

[0242] Synthesis of Copolymer b

[0243] 100 parts of xylene was kept at 80°C in a nitrogen stream, and while stirring, 66 parts of ethyl methacrylate, 28 parts of 2-ethylhexyl methacrylate, 6 parts of thioglycolic acid, and a polymerization initiator ("PERBUTYL (registered trademark) O" [active ingredient tert-butyl peroxy 2-ethylhexanoate, manufactured by NOF Co., Ltd.]) 0.3 parts of the mixture was dripped over 4 hours. After completion of dripping, 0.5 part of "PERBUTYL (registered trademark) O" was added every 4 hours, and it stirred at 80 degreeC for 12 hours. After completion of the reaction, an appropriate amount of xylene was added to adjust the non-volatile content to obtain a xylene solution of the copolymer b having a non-volatile content of 50%.

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Abstract

The present invention relates to a liquid crystal display device using a specific liquid crystal composition and having a color filter of a specific inclination parameter representing the agglomeration degree of organic dye. This invention provides a liquid crystal display device preventing poor display problems such as hollowness, non-uniform orientation and after-image caused by the lowered voltage holding rate (VHR) of liquid crystal layer and the increased ion density (ID). The liquid crystal display device of this invention is characterized by preventing reduction of voltage holding rate (VHR) of liquid crystal layer and the increase of ion density (ID) and inhibiting the generation of poor display such as after-image, thereby making this invention particularly useful for IPS mode and FFS mode liquid crystal display devices with active matrix drive, and applicable to liquid crystal display devices such as liquid crystal TV, monitors, mobile phones, and smart phones.

Description

technical field [0001] The present invention relates to a liquid crystal display device. Background technique [0002] From clocks and calculators, liquid crystal display devices have been used in various household electrical appliances, measurement equipment, automotive panels, word processors, electronic notebooks, printers, computers, televisions, and the like. As a liquid crystal display method, the representative liquid crystal display methods include TN (twisted nematic) type, STN (super twisted nematic) type, DS (dynamic light scattering) type, GH (guest-host) type, IPS (in-plane switching ) type, OCB (Optically Compensated Birefringence) type, ECB (Voltage Controlled Birefringence) type, VA (Vertical Alignment) type, CSH (Color Super Vertical) type or FLC (Ferroelectric Liquid Crystal) and so on. In addition, as the driving method, starting from the conventional static driving, multiplexing driving has become a common method, and the simple matrix method and the rec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1335G02B5/20C09K19/44
CPCC09K19/44G02F1/133514C09K19/20C09K19/3066C09K2019/0466C09K2019/122C09K2019/123C09K2019/124C09K2019/3004C09K2019/3009C09K2019/301C09K2019/3016C09K2019/3019C09K2019/3025C09K2019/3422G02B5/201C09K19/08C09K19/12C09K19/42G02F1/13G02F1/133512
Inventor 栗山毅河村丞治小池淳一郎牧博志宍仓正视浅见亮介
Owner DIC CORP
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