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Liquid crystalline media comprising polymerizable compounds

A technology of polymerizing compounds and compounds, used in liquid crystal materials, chemical instruments and methods, instruments, etc.

Pending Publication Date: 2021-08-24
MERCK PATENT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the first step at about 10 2 s cures most of the polymerizable components, but the second longer step achieves complete consumption of the remaining polymerizable species (approximately 10 3 s)

Method used

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  • Liquid crystalline media comprising polymerizable compounds
  • Liquid crystalline media comprising polymerizable compounds
  • Liquid crystalline media comprising polymerizable compounds

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0653] The following examples illustrate the invention without limiting it. However, they show the person skilled in the art preferred mixture concepts and the compounds preferably used and their corresponding concentrations and combinations with one another. In addition, the examples illustrate achievable properties and combinations of properties.

[0654] In addition, the following abbreviations and symbols are used:

[0655] V 0 Indicates the capacitive threshold voltage [V] at 20°C,

[0656] no e denotes the extraordinary refractive index at 20 °C and 589 nm,

[0657] no o denotes the ordinary refractive index at 20°C and 589 nm,

[0658] Δn represents the optical anisotropy at 20 °C and 589 nm,

[0659] ε ⊥ denotes the permittivity perpendicular to the director at 20°C and 1kHz,

[0660] ε || denotes the permittivity parallel to the director at 20 °C and 1 kHz,

[0661] Δε denotes the dielectric anisotropy at 20 °C and 1 kHz,

[0662] cl.p., T(N,I) means clear...

Embodiment P1

[0801] A polymerizable compound according to the invention was prepared by adding 0.3% of RM-1, 0.2% of RM-2, 0.5% of RM-3 and 0.9% of SA-20 as polymerizable compounds to the nematic LC host mixture N1 Mixture P1, and homogenize the mixture.

Embodiment P2

[0803] A polymerizable compound according to the invention was prepared by adding 0.3% of RM-1, 0.3% of RM-2, 0.5% of RM-3 and 1.5% of SA-20 as polymerizable compounds to the nematic LC host mixture N1 Mixture P2, and homogenize the mixture.

[0804] Comparative mixture examples: polymerizable mixtures C1-C4

[0805] For comparison, polymerizable mixtures C1 and C2 were prepared by adding RM-1 only to nematic LC host mixture N1 (0.6%, 0.9%, respectively).

[0806] In addition, comparative polymerizable mixture C3 was prepared by adding 0.3% RM-1, 0.2% RM-2 and 0.9% SA-20 to nematic LC host mixture N1.

[0807] Even further, comparative polymerizable mixture C4 was prepared by adding 0.3% RM-1, 0.2% RM-2 and 1.5% SA-20 to nematic LC host mixture N1.

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Abstract

The present invention relates to liquid crystal (LC) media comprising several polymerizable compounds as further defined in the description or in the claims and additives for vertical alignment. The media are suitable for use in LC displays, especially in LC displays of the polymer-stabilized alignment type, when one or two conventional alignment layers are omitted.

Description

technical field [0001] The present invention relates to liquid crystal (LC) media, as further defined in the description or claims, comprising several polymerizable compounds and additives for homeotropic alignment. The medium is suitable for use in LC displays, especially of the polymer stabilized alignment type, when one or two conventional alignment layers are omitted. Background technique [0002] One liquid crystal display (LCD) mode currently in use is the TN ("twisted nematic") mode. However, a disadvantage of TN LCDs is the strong dependence of contrast ratio on viewing angle. [0003] In addition, so-called VA (Vertical Alignment) displays with wider viewing angles are known. The LC cell of a VA display contains a layer of an LC medium between two transparent electrodes, wherein the LC medium generally has a negative dielectric anisotropy. In the off state, the molecules of the LC layer are aligned perpendicular to the electrode surface (homeotropically) or have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/46C09K19/56G02F1/1333
CPCC09K19/46C09K19/56G02F1/1333C09K19/04C09K2019/0448C09K2019/3016C09K2019/3004C09K2019/3027C09K2019/301C09K2019/3009C09K2019/122C09K2019/123C09K19/3491C09K2019/124C09K19/3098C09K19/3066C09K2019/3422
Inventor 庄敏慈陈依雯陈泽霖周光廷
Owner MERCK PATENT GMBH