Liquid crystal display device

A liquid crystal display device, liquid crystal layer technology, applied in liquid crystal materials, instruments, chemical instruments and methods, etc., can solve the problems of white spots, uneven orientation, etc., and achieve the effect of preventing white spots and preventing decline

Active Publication Date: 2019-04-02
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 to prevent the decrease of the voltage retention rate (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 using a specific pigment, and solve white spots and uneven orientation. Liquid crystal display devices with poor display problems such as burning and burning

Method used

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Examples

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preparation example Construction

[0333] Examples of thermoplastic resins used in the preparation of photocurable compositions include urethane resins, acrylic resins, polyamide resins, polyimide resins, styrene maleic resins, benzene Ethylene maleic anhydride resin, etc.

[0334]Examples of photocurable compounds include: 1,6-hexanediol diacrylate, ethylene glycol diacrylate, neopentyl glycol diacrylate, triethylene glycol diacrylate, bis(acryloxy Difunctional monomers such as ethoxy)bisphenol A, 3-methylpentanediol diacrylate, etc., trimethylolpropane triacrylate, pentaerythritol triacrylate, tris[2-(meth)propylene Acyloxyethyl] isocyanurate, dipentaerythritol hexaacrylate, dipentaerythritol pentaacrylate and other low molecular weight multifunctional monomers, polyester acrylate, polyurethane acrylate, polyether acrylate Such as polyfunctional monomers with larger molecular weight.

[0335] Examples of photopolymerization initiators include acetophenone, benzophenone, benzyl dimethyl ketal, benzoyl peroxi...

Embodiment 1～ Embodiment 5

[0433] Electrode structures were formed on the first substrate and the second substrate, and a vertically oriented alignment film was formed on the respective opposite sides, followed by a weak rubbing treatment to make a VA unit, and the liquid crystal composition 1 shown in the following table was sandwiched held between the first substrate and the second substrate. Next, the liquid crystal display devices (d gap =3.5 μm, alignment film SE-5300). The VHR and ID of the obtained liquid crystal display device were measured. Moreover, the burn-in evaluation of the obtained liquid crystal display device was performed. The results are shown in the following tables.

[0434] [Table 12]

[0435]

Liquid crystal composition 1

T NI / ℃

74.3

Δn

0.122

Δε

-3.4

γ1 / mPa·s

127

3-Cy-Cy-2

18

3-Ph-Ph-1

6

3-Cy-Cy-Ph-1

6

3-Cy-Ph-Ph-2

6

V-Cy-Ph-Ph-3

6

3-Cy-Ph5-02

10

5-Cy-Ph5-02 ...

Embodiment 6～ Embodiment 20

[0441] In the same manner as in Example 1, liquid crystal display devices of Examples 6 to 20 were produced by interposing the liquid crystal compositions shown in the following table, and using color filters 1 to 5 shown in the tables. , and determine its VHR and ID. Moreover, the burn-in evaluation of the said liquid crystal display device was performed. The results are shown in the following tables.

[0442] [Table 14]

[0443]

[0444] [Table 15]

[0445]

[0446] [Table 16]

[0447]

[0448] [Table 17]

[0449]

[0450] The liquid crystal display devices of Examples 6 to 20 can realize high VHR and small ID. In addition, in the burn-in evaluation, there was no afterimage, or even if there was, it was extremely small and at an allowable level.

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Abstract

The present invention relates to a liquid crystal display device which employs a color filter that uses a specific liquid crystal composition and a specific dye and/or pigment. The present invention provides a liquid crystal display device which is prevented from a decrease in voltage holding ratio (VHR) of a liquid crystal layer and an increase in ion density (ID), thereby solving the problems ofdisplay failure such as white spot, alignment unevenness and image burn-in. Since a liquid crystal display device of the present invention has such characteristics that a decrease in voltage holdingratio (VHR) of a liquid crystal layer and an increase in ion density (ID) are prevented and the occurrence of display failure such as image burn-in is suppressed, this liquid crystal display device isuseful as an IPS mode or FFS mode liquid crystal display device for active matrix driving, and is applicable to liquid crystal display devices such as a liquid crystal TV set, 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] Liquid crystal display devices, represented by clocks and desktop calculators, are used in various household electrical appliances, measuring instruments, panels for automobiles, word processors, electronic notebooks, printers, computers, televisions, and the like. Representative examples of liquid crystal display methods include: twisted nematic (TN) type, super twisted nematic (STN) type, dynamic light scattering (DS) type, guest-host ( Guest host (GH) type, in-plane switching (IPS) type, optically compensated birefringence (OCB) type, electrically controlled birefringence (ECB) type, vertical alignment (vertical alignment) , VA) type, color super homeotropic (color super homeotropic, CSH) type, or ferroelectric liquid crystal (ferroelectric liquid crystal, FLC), etc. In addition, as the driving method, it is generally changed from the existing static driving to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1335C09K19/44
CPCG02F1/133514C09K19/44
Inventor 小川真治岩下芳典船仓省二大石健太郎
Owner DIC CORP
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