Liquid-crystalline medium

A liquid crystal medium and medium technology, applied in liquid crystal materials, chemical instruments and methods, etc., can solve problems such as burning and image retention

Active Publication Date: 2010-08-04
MERCK PATENT GMBH
View PDF15 Cites 45 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0031] In LCD TV applications, so-called reliability problems often occur, such as image retention, which is the phenomenon of image "burning (Einbrennen)" that can be seen when the display has been in operation for an extended period of time

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-crystalline medium
  • Liquid-crystalline medium
  • Liquid-crystalline medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0040] a) R in formula IA, IB and IC 1A , R 1B , R 2B and R 1C preferably represents a straight-chain alkyl group, especially C 2 h 5 , n-C 3 h 7 , n-C 4 h 9 , and n-C 5 h 11 , n-C 6 h 13 .

[0041] R 2A and R 2C Preferably represents alkyl or alkoxy, especially CH 3 , n-C 3 h 7 , n-C 5 h 11 , and C 2 h 5 , n-C 4 h 9 .

[0042] The alkenyl side chains in the compounds of formulas IA, IB and IC are preferably present in the E configuration.

[0043] b) Liquid-crystalline media comprising one, two, three, four or more, preferably one, two or three compounds of the formulas IA, IB and / or IC.

[0044] c) Liquid-crystalline media in which the proportion of the compound of the formula IA in the total mixture is ≧5% by weight, preferably at least 10% by weight, particularly preferably ≧15% by weight.

[0045] If present, the proportion of compounds of the formula IB in the overall mixture is preferably ≧5% by weight, in particular ≧10% by weight, very partic...

Embodiment 1

[0276] CY-3-O4 9,60% Clearing point [°C]: 63

[0277] CY-5-O4 9,60% Δn[589nm, 20°C]: 0,0762

[0278] CCY-2-O2 9,60% Δε[1kHz, 20°C]: -3,0

[0279] CCY-3-O2 9,60% 1 [mPa·s, 20°C]: 112

[0280] CCY-5-O2 6,40%

[0281] CCY-2-1 9,60%

[0282] CCY-3-1 6,40%

[0283] CC-5-V 6,40%

[0284] PCH-53 12,80%

[0285] CC-1-V3 20,00%

Embodiment 2

[0287] CY-3-O4 9,60% Clearing point [°C]: 78

[0288] CY-5-O4 9,60% Δn[589nm, 20°C]: 0,0820

[0289] CCY-2-O2 9,60% Δε[1kHz, 20°C]: -3,1

[0290] CCY-3-O2 9,60% 1 [mPa·s, 20°C]: 140

[0291] CCY-5-O2 6,40%

[0292] CCY-2-1 9,60%

[0293] CCY-3-1 6,40%

[0294] CC-5-V 6,40%

[0295] PCH-53 12,80%

[0296] CC-5-V3 20,00%

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

No PUM Login to view more

Abstract

The invention relates to a liquid-crystalline medium having negative dielectric anisotropy on the basis of a mixture of polar compounds, which contains at least one compound selected from the group of compounds of the formulae (IA), (IB) and (IC), where R1A, R2A, R1B, R2B, R1C, R, L, m, n, o, p and b have the meanings specified in claim 1, and to its use for an active matrix display, in particular based on the ECB, PALC, FFS or IPS effect.

Description

technical field [0001] The invention relates to a liquid-crystalline medium with negative dielectric anisotropy based on a mixture of polar compounds comprising at least one compound selected from the compounds of the formulas IA, IB and IC, [0002] [0003] in [0004] R 1A , R 1B , R 2B and R 1C Each independently of each other represents an alkyl group with 2-6 C atoms, [0005] R 2A and R 2C Each independently of the other means unsubstituted, consisting of CN or CF with not more than 6 C atoms 3 Alkyl groups which are monosubstituted or at least monosubstituted by halogen, wherein one or more CH in these groups 2 -The group can also be replaced by -O-, -S-, , -C≡C-, -CF 2 O-, -OCF 2 -, -OC-O- or -O-CO- are replaced by O atoms not directly connected to each other, and if L=F, R 2C can also represent halogen, preferably F or Cl, [0006] L means H or F, [0007] m, n, o and p each independently represent 0, 1 or 2, [0008] b means 0 or 1. [0009] Such...

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): C09K19/30C09K19/42C09K19/44
CPCC09K19/3003C09K19/44C09K2019/0451C09K19/42C09K2019/0444C09K2323/00
Inventor M·科拉森-迈莫尔M·布莱默樽见和明
Owner MERCK PATENT GMBH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap