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Liquid crystal medium

A medium, liquid crystal technology, applied in the direction of liquid crystal materials, instruments, chemical instruments and methods, etc., can solve the problems of reducing reliability, increasing the viscosity of the LC host mixture, reducing the viscosity, etc.

Active Publication Date: 2016-05-25
MERCK PATENT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of terphenyl compounds increases the viscosity of the LC host mixture, thus resulting in slower response times
Furthermore, addition of terphenyl compounds can lead to reduced reliability, and VHR drop after UV stress in LC media
[0023] Another problem is therefore to provide LC mixtures and LC media for PSA displays showing reduced viscosity and high VHR, while at the same time enabling rapid and complete polymerisation of the RM

Method used

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Experimental program
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Embodiment approach

[0200] Further preferred compounds of formulas I1-I13 and II1-II14 are selected from the following preferred embodiments, including any combination thereof:

[0201] -P 1 and P 2 selected from the group consisting of acrylate, methacrylate and oxetanyl,

[0202] -L does not represent or contain a polymerizable group,

[0203] -L does not represent or contain the group P-Sp-,

[0204] - r+s+t in at least one of the benzene rings in formulas I1-I13 and II1-II14 is not 0, preferably 1 or 2, and L is different from P-Sp- and is not polymerizable, and it is preferably selected from F, Cl, -CN and straight-chain or branched alkyl groups having 1 to 25, particularly preferably 1 to 10, C atoms, wherein in addition, one or more non-adjacent CH 2 The groups are each independently replaced by -C(R 00 )=C(R 000 )-, -C≡C-, -N(R 00 )-, -O-, -S-, -CO-, -CO-O-, -O-CO-, -O-CO-O- are replaced in such a way that the O and / or S atoms are not directly attached to each other, and wherein in ...

Embodiment 1

[0662] Nematic LC host mixture N1 was formulated as follows.

[0663]

[0664]

[0665] The mixture contained 1% of a terphenyl compound (PGIY-2-O4).

[0666] Polymerizable mixtures P1-P4 according to the invention were prepared by adding one of the direactive RMD1 and D2 and one of the trireactive RMT1 and T2 to the nematic LC host mixture N1. The comparative polymerizable mixture C1 was prepared by adding the bireactive RMD1 to the nematic LC host mixture C1. Comparative polymerizable mixtures C1 and C2 were prepared by adding direactive RMD1 or D2 to nematic LC host mixture N1.

[0667] The RM structure is shown below.

[0668]

[0669] The composition of the polymerizable mixture is shown in Table 1.

[0670] Table 1 - Composition of the polymerizable mixture

[0671] Mixture number

LC subject

RM D1[%]

RM D2[%]

RM T1[%]

RM T2[%]

C1

C1

0.3

0

0

0

C2

N1

0.4

0

0

0

C3

N1...

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Abstract

The present invention relates to a liquid crystal (LC) medium comprising a terphenyl compound and at least two polymerisable compounds, to a process for its preparation, to its use for optical, electro-optical and electronic purposes, in particular in LC displays, especially in an LC display of the polymer sustained alignment (PSA) type, and to an LC display, especially a PSA display, comprising it.

Description

[0001] The present invention relates to liquid crystal (LC) media comprising a terphenyl compound and at least two polymerizable compounds, to a process for their preparation, to their use for optical, electro-optical and electronic purposes, in particular in liquid crystal displays, especially Use in LC displays of the polymer stabilized alignment (PSA) type, and to LC displays, especially PSA displays, comprising the liquid crystal medium. Background of the invention [0002] A relatively new liquid crystal mode is the so-called PS ("polymer stabilized") or PSA ("polymer stabilized alignment") mode, for which the term "polymer stabilized" is also occasionally used. In PSA displays, one or more polymerizable compounds, preferably polymerizable LC medium for polymerizing monomeric compounds. After filling the LC medium into the display, the polymerizable compound is typically polymerized by UV light, optionally simultaneously polymerized or crosslinked in situ by applying a v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/44G02F1/1333
CPCC09K19/04C09K2019/0448C09K2019/123C09K19/06C09K19/12C09K19/44C09K2019/122C09K2019/127C09K2019/328C09K2019/3425
Inventor 尹铉轸郑知苑李殷圭陈旻玉尹容国
Owner MERCK PATENT GMBH
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