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LCD device

A technology of liquid crystal display element and liquid crystal composition, which is applied in the direction of liquid crystal materials, instruments, chemical instruments and methods, etc., and can solve the problems of no effective method found, low viscosity, etc.

Inactive Publication Date: 2016-10-12
DIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, these components also have room for improvement from the standpoint of high-speed responsiveness
In particular, regarding the high-speed response of the rising speed of the liquid crystal display device, the low viscosity of the liquid crystal composition, the high dielectric constant, the low elastic constant, or the provision of the pretilt angle (pretilt angle), or driving methods such as the overdrive method Various methods have been put into practical use, such as the improvement of the liquid crystal composition, but regarding the drop rate, currently, no effective method has been found other than the lowering of the viscosity of the liquid crystal composition, and improvement is desired

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0665] A composition (Δn: 0.103, viscosity η: 20 mPa·s, Vth: 1.72 Vrms) represented by the following (LCP-1) was prepared as a P-type liquid crystal composition. A compound represented by the following formula (V1-1-1) was used as a polymerizable compound.

[0666]Preparation of P-type liquid crystal composition (LCP-1) 100-97%, polymerizable compound (V1-1-1) 1.96-2.94%, polymerization photoinitiator Irgacure651 relative to polymerizable compound (V1-1-1) 2 % of polymerizable liquid crystal composition (LCM-1). After heating the solid polymerizable compound (V1-1-1) to 60°C to dissolve it in the liquid crystal (LCP-1), it was confirmed with a polarizing microscope that the polymerizable compound (V1-1-1) was homogeneous at room temperature. Dissolved to present a nematic liquid crystal phase.

[0667] In order to obtain uniaxial alignment (horizontal alignment) of liquid crystals, a polyimide alignment film-coated cell with parallel rubbing alignment of ITO with a cell gap ...

Embodiment 2

[0679] Prepare a P-type liquid crystal composition (LCP-1; Δn: 0.103, viscosity η: 20mPa·s) 95%, polymeric compound (V1-1-1) 5% and relative to the polymeric compound (V1-1-1 ) is a polymerizable liquid crystal composition (LCM-1) of 2% polymerizable photoinitiator Irgacure651.

[0680] In order to obtain uniaxial alignment (horizontal alignment) of liquid crystals, a cell with a cell gap of 3.5 μm coated with a polyimide alignment film and with parallel rubbed alignment of ITO was used. The polymerizable liquid crystal composition (LCM-1) was heated to 60° C. to be dissolved in LCP-1, and injected into the glass cell by a vacuum injection method.

[0681] After the injection, the glass cell was taken out, and the injection port was sealed with a sealant 3026E (manufactured by Three Bond). The irradiation intensity after passing through the ultraviolet cut filter L-37 (manufactured by HOYA CANDEO OPTRONICS) at 25°C or -10°C is 15mW / cm 2 UV rays for 300 seconds. There...

Embodiment 3

[0685] A composition (Δn: 0.102, viscosity η: 16.8, Δε: -3.8) represented by the following (LCN-1) was prepared as an N-type liquid crystal composition. A compound represented by formula (V1-1-2) is used as a polymerizable compound.

[0686] Prepared N-type liquid crystal composition (LCN-1; Δn: 0.102, viscosity η: 16.8, Δε: -3.8) 96%, polymeric compound (V1-1-2) 4% and relative to polymeric compound (V1- 1-2) A polymerizable liquid crystal composition (LCM-2) containing 2% of a polymerizable photoinitiator Irgacure651.

[0687] In order to obtain the homeotropic alignment of the liquid crystal, use a cell gap of 3 μm, apply a polyimide alignment film, and perform a rubbing alignment treatment to form a pretilt angle of 1° to 2° with respect to the normal direction of the substrate surface. of parallel rubbed-oriented cells. After heating the solid polymerizable compound (V1-1-2) to 60°C to dissolve it in the liquid crystal (LCN-1), it was confirmed by a polarizing mic...

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Abstract

Provided is a LCD device having excellent high-speed responsiveness. This LCD device contains a polymer or a copolymer in a liquid crystal composition that is sandwiched between two transparent substrates, at least one of which has an electrode, and the quantity of polymer or copolymer contained is 1 mass% to less than 40 mass% of the total quantity obtained by adding the liquid crystal composition and the polymer or copolymer. This LCD device can be used in a variety of operational modes of TN, STN, ECB, VA, VA-TN, IPS, FFS, pi cell, OCB, cholesteric liquid crystals and the like.

Description

technical field [0001] The invention relates to a liquid crystal display element. Background technique [0002] The feature of the field sequential full-color display method without color filters is to use a backlight device that is sequentially lit in the order of "red→green→blue". The frame period of common CRT and liquid crystal display is 16.7ms, but the field sequential full-color display mode requires high-speed responsiveness with a frame period of 5.6ms. [0003] As an index showing high-speed responsiveness, the sum of τd and τr can be cited. τd is the falling response time of the liquid crystal, and τr is the rising response time of the liquid crystal. In order to satisfy the high-speed responsiveness in the field sequential full-color display mode, it is desired that the sum of τd and τr is less than 1.5 ms. [0004] Currently, liquid crystal materials called nematic liquid crystals on the market are commonly used in flat-panel displays such as TVs, monitors, m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1337C09K19/38C09K19/54G02F1/13
CPCC09K19/2014C09K19/322C09K19/544G02F1/1334G02F1/133788C09K19/0216C09K19/3001C09K19/3066C09K19/56G02F1/13345
Inventor 藤泽宣须藤豪山本修平丸山和则高津晴义后藤麻里奈小寺史晃张琴姫
Owner DIC CORP
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