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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
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  • 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

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  • 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%

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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

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Application Information

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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
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