Liquid crystal display device

A technology of liquid crystal display device and liquid crystal layer, applied in the direction of liquid crystal material, instrument, adhesive type, etc., can solve the problems of low viscosity, uneven orientation, burn-in, etc., and achieve the effect of preventing reduction, low viscosity, and preventing white spots

Active Publication Date: 2016-07-27
DIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] That is, the present invention provides a cured product having a practical liquid crystal layer temperature range and a large dielectric constant anisotropy (Δε) by using a specific liquid crystal composition and a cured product of a specific curable resin composition as a sealant. ), low viscosity and appropriate refractive index anisotropy (Δn), and prevent the decrease of the voltage retention rate (VHR) of the liquid crystal layer, and solve the problems of poor display such as white spots, uneven orientation, and burn-in. Liquid crystal display device

Method used

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Examples

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Effect test

Embodiment

[0321] Examples are listed below to further describe the present invention, but the present invention is not limited to these examples. In addition, "%" in the composition of the following Examples and Comparative Examples means "% by mass".

[0322] In the examples, the measured characteristics are as follows.

[0323] T ni :Nematic phase-isotropic liquid phase transition temperature (℃)

[0324] Δn: Refractive index anisotropy at 25℃

[0325] Δε: Dielectric constant anisotropy at 25℃

[0326] η: Viscosity at 20°C (mPa·s)

[0327] γ1: Rotational viscosity at 25°C (mPa·s)

[0328] VHR: Voltage retention rate at 70°C (%)

[0329] (The ratio of the measured voltage to the initial applied voltage is expressed in% when the liquid crystal composition is injected into a cell with a cell thickness of 3.5μm and the measurement is performed under the conditions of applying 5V, a frame period of 200ms, and a pulse width of 64μs.)

[0330] Uneven orientation: In the energized state and the non-energ...

Synthetic example A

[0364] (Synthesis example A) Synthesis of modified epoxy resin (A)

[0365] While purging the solvent with nitrogen, heating was performed to increase the temperature to the reflux temperature. 100 parts by weight of glycidyl methacrylate, 40 parts by weight of methyl methacrylate, 20 parts by weight of hydroxyethyl methacrylate, 40 parts by weight of styrene, and n-butyl methacrylate were dissolved therein over 5 hours. 200 parts by weight of ester and 40 parts by weight of polymerization initiator (manufactured by NOF Corporation, PERBUTYLO, 10-hour half-life temperature 72.1°C, 2-ethylhexanoate tert-butyl peroxide) 40 parts by weight, and then kept at 100°C 5 hours. A column filled with 30 parts by weight of a natural combination of quartz and kaolin (manufactured by Hoffmann Minerals, Silitin V85) in order to adsorb ionic impurities in the reactant was used to filter 100 parts by weight of the obtained resin to remove the solvent. A modified epoxy resin (A) containing a gly...

Synthetic example B

[0367] (Synthesis example B) Synthesis of acrylic modified epoxy resin (B)

[0368] 100 parts by weight of bisphenol F epoxy resin (manufactured by Nippon Steel Chemical Co., YDF-8170C), 22.5 parts by weight of acrylic acid, and 0.125 parts by weight of triethanolamine were uniformly dissolved in a solvent, and the solution was refluxed at 110°C for 5 hours Stir. Using a column filled with 30 parts by weight of a natural combination of quartz and kaolin (manufactured by Hoffmann Mineral Company, Silitin V85) in order to adsorb ionic impurities in the reactants, 100 parts by weight of the resin obtained was filtered to remove the solvent, and This obtained acrylic modified epoxy resin (B).

[0369] The weight average molecular weight Mw (measured by GPC) of the acrylic modified epoxy resin (B) is 392, and the hydrogen bonding functional group value is 2.6×10 -3 mol / g. In addition, the amount of carbon-carbon double bonds is 2.6×10 -3 mol / g.

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Abstract

The present invention relates to a liquid crystal display device which uses a specific liquid crystal composition and a sealing agent using a cured product of a specific curable resin composition. The present invention provides a liquid crystal display device which prevents decrease in the voltage holding ratio (VHR) of a liquid crystal layer and increase in the ion density (ID), and which solves problems of display failure such as white spot, alignment unevenness and screen burn-in. Since a liquid crystal display device of the present invention is characterized by preventing decrease in the voltage holding ratio (VHR) of a liquid crystal layer and by suppressing the occurrence of display failure such as alignment unevenness and screen burn-in, this liquid crystal display device is useful as a liquid crystal display device of VA mode, PSVA mode, IPS mode and FFS mode for active matrix driving, and is applicable to liquid crystal display devices such as a liquid crystal TV, a monitor, a mobile phone and a smart phone.

Description

Technical field [0001] The invention relates to a liquid crystal display device. Background technique [0002] Starting with clocks and calculators, liquid crystal display devices are gradually being used in various household electrical equipment, measuring equipment, automotive panels, word processors, electronic notebooks, printers, computers, and televisions. As a liquid crystal display method, its representative examples 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 (optical compensation birefringence) type, ECB (voltage controlled birefringence) type, VA (vertical orientation) type, CSH (color super vertical) type, or FLC (ferroelectric liquid crystal), etc. In addition, as the driving method, the conventional static driving is generally to the multiplex driving. The simple matrix method and the active matrix (AM) method using TFT (Thin Film Transistor) or TF...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1339C09K19/12C09K19/30C09K19/42G02F1/13
CPCC09K19/42G02F1/1339G02F1/0045C09J133/066C09J133/068C09K2019/122C09K2019/123C09K2019/3027C09K19/542C08L63/04C09K2019/3013C09K2019/3025C09K2019/521C09K19/3003C09K19/3066C09K19/322C09K2019/3004C09K2019/3009C09K2019/301C09K2019/3016C08F222/1067C08F222/1065C08F220/1804C08F220/325C08F220/14C08F212/08C08F220/20C09K19/12C09K19/30C08G59/1466C08G59/1477C09J133/10C09J135/02C09J163/10G02F1/133365
Inventor 小野善之河村丞治岩下芳典武田博之
Owner DIC CORP
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