Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Liquid-crystal display

A technology of liquid crystal display device and liquid crystal composition, which is applied in the directions of liquid crystal materials, optics, instruments, etc., can solve problems such as uneven orientation, burns, and white space, and achieve the effect of preventing reduction and white space.

Active Publication Date: 2015-10-14
DIC CORP
View PDF6 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The present invention provides to prevent the decrease of the voltage holding ratio (VHR) of the liquid crystal layer, the increase of the ion density (ID), and solve the blanking by using a specific liquid crystal composition and a color filter having a specific slope parameter showing the degree of aggregation of organic pigments Liquid crystal display devices that have poor display problems such as uneven orientation and burns

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Liquid-crystal display
  • Liquid-crystal display
  • Liquid-crystal display

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0219] Hereinafter, although an Example is given and some best modes of this invention are described in detail, this invention is not limited to these Examples. In addition, "%" in the composition of a following Example and a comparative example shows "mass %".

[0220] In the examples, the characteristics measured are as follows.

[0221] T ni : Nematic phase - isotropic liquid phase transition temperature (°C)

[0222] Δn: Refractive index anisotropy at 25°C

[0223] Δε: Dielectric constant anisotropy at 25°C

[0224] η: Viscosity at 20°C (mPa·s)

[0225] gamma 1 : Rotational viscosity at 25°C (mPa·s)

[0226] d gap : Gap between the first substrate and the second substrate of the unit (μm)

[0227] VHR: Voltage retention rate at 70°C (%)

[0228] (The ratio of the measured voltage to the initial applied voltage when the liquid crystal composition is injected into a cell with a cell thickness of 3.5 μm and measured under the conditions of an applied voltage of 5 V, ...

Synthetic example 1

[0255] Synthesis of Copolymer a

[0256] Keep 100 parts of xylene at 80°C in a nitrogen stream, and dropwise add 68 parts of ethyl methacrylate, 29 parts of 2-ethylhexyl methacrylate, 3 parts of mercaptoacetic acid and polymerization initiator over 4 hours while stirring. Agent (“PERBUTYL (registered trademark) O” [active ingredient tert-butyl peroxy-2-ethylhexanoate, manufactured by NOF Co., Ltd.]) 0.2 parts. After completion of the dropwise addition, 0.5 parts of "PERBUTYL (registered trademark) O" was added every 4 hours, and it stirred at 80 degreeC for 12 hours. After the reaction was completed, 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

[0257] Synthesis of Copolymer b

[0258] Keep 100 parts of xylene at 80°C in a nitrogen stream, and dropwise add 66 parts of ethyl methacrylate, 28 parts of 2-ethylhexyl methacrylate, 6 parts of mercaptoacetic acid and polymerization initiator over 4 hours while stirring. Agent (“PERBUTYL (registered trademark) O” [active ingredient tert-butyl peroxy-2-ethylhexanoate, manufactured by NOF Co., Ltd.]) 0.3 parts. After completion of dropping, 0.5 parts 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 copolymer b having a non-volatile content of 50%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
temperatureaaaaaaaaaa
electrical resistivityaaaaaaaaaa
Login to View More

Abstract

This invention pertains to a liquid-crystal display that uses: a specific liquid-crystal composition; and a color filter that has a specific slope parameter that indicates the degree of agglomeration in an organic pigment. This invention provides a liquid-crystal display that prevents decreases in the voltage holding ratio (VHR) of a liquid-crystal layer, prevents increases in ion density, and solves display problems such as white areas, alignment unevenness, and burn-in. Since this liquid-crystal display prevents decreases in the VHR of the liquid-crystal layer, prevents increases in ion density, and minimizes display problems such as burn-in, said liquid-crystal display is particularly useful as an active-matrix VA or PS-VA liquid-crystal display and can be used in an LCD television, a monitor, a mobile phone, a smartphone, or the like.

Description

technical field [0001] The present invention relates to a liquid crystal display device. Background technique [0002] Liquid crystal display devices have been used in various household electrical appliances represented by clocks and electronic calculators, measuring instruments, automotive panels, word processors, electronic notebooks, printers, computers, televisions, and the like. Representative examples of liquid crystal display methods include TN (Twisted Nematic) type, STN (Super Twisted Nematic) type, DS (Dynamic Light Scattering) type, GH (Guest-Host) type, and IPS (In-Plane Switching) type. , OCB (Optically Compensated Birefringence) type, ECB (Voltage Controlled Birefringence) type, VA (Vertical Alignment) type, CSH (Color Angle Super Vertical) type or FLC (Ferroelectric Liquid Crystal) and so on. In addition, as the driving method, the traditional static driving is usually changed to multi-channel driving. For the simple matrix method, the active matrix (AM) meth...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1335C09K19/12C09K19/30C09K19/38C09K19/42G02B5/20G02F1/13
CPCC09K19/44C09K19/3066C09K19/322C09K19/42C09K2019/0448C09K2019/122C09K2019/123C09K2019/3004C09K2019/3016C09K2019/3027G02B5/20G02F1/133514G02F2001/133742G02B5/223C09K2019/3009C09K2019/301G02F1/133742C09K19/3003G02F1/133365G02F1/133512
Inventor 小川真治岩下芳典小池淳一郎牧博志肉仓正视浅见亮介
Owner DIC CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com