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Liquid crystal alignment treatment agent, liquid crystal alignment film, and liquid crystal display device

A technology of liquid crystal display elements and liquid crystal alignment films, which is applied in the directions of instruments, optics, nonlinear optics, etc., can solve the problems of increased voltage and power consumption, and achieve high adhesion, good scattering characteristics, and good optical characteristics Effect

Pending Publication Date: 2021-10-01
NISSAN CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, conventional devices require constant application of voltage in order to obtain a transmissive state, so power consumption increases when used in applications that are often used in a transparent state, such as window glass

Method used

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  • Liquid crystal alignment treatment agent, liquid crystal alignment film, and liquid crystal display device
  • Liquid crystal alignment treatment agent, liquid crystal alignment film, and liquid crystal display device
  • Liquid crystal alignment treatment agent, liquid crystal alignment film, and liquid crystal display device

Examples

Experimental program
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preparation example Construction

[0200] As the preparation method of liquid crystal composition, can enumerate: the method of mixing liquid crystal, polymerizable compound, and specific liquid crystal additive compound together; Mix polymerizable compound and specific liquid crystal additive compound in advance, then mix the obtained mixture with liquid crystal mixed approach.

[0201] Among them, in the present invention, a method of mixing a polymerizable compound and a specific liquid crystal additive compound in advance, and then mixing the obtained mixture with a liquid crystal is preferable.

[0202] In the case of preparing a liquid crystal composition as described above, heating may be performed depending on the solubility of the polymerizable compound and the specific liquid crystal additive compound. The temperature at this time is preferably lower than 100°C.

[0203]

[0204] The substrate used for the liquid crystal display element is not particularly limited as long as it is a substrate with ...

Embodiment

[0217] Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited thereto.

[0218] Abbreviations used hereinafter are as follows.

[0219] "Specific Compounds"

[0220]

[0221] "Compounds used in polyimide-based polymers"

[0222]

[0223]

[0224]

[0225]

[0226]

[0227]

[0228]

[0229]

[0230] "Crosslinking compound"

[0231]

[0232] "solvent"

[0233] NMP: N-methyl-2-pyrrolidone.

[0234] γ-BL: γ-butyrolactone.

[0235] BCS: Ethylene glycol monobutyl ether.

[0236] PB: Propylene glycol monobutyl ether.

[0237] PGME: Propylene Glycol Monomethyl Ether.

[0238] "Compounds Used in Liquid Crystal Compositions"

[0239]

[0240]

[0241]

[0242] R1: IBXA (manufactured by Osaka Organic Chemical Industry Co., Ltd.)

[0243] R2: KAYARAD FM-400 (manufactured by Nippon Kayaku Co., Ltd.)

[0244] R3: KAYARAD HX-220 (manufactured by Nippon Kayaku Co., ...

Embodiment 2

[0290] T1 (0.13g) and NMP (16.0g) were added to the polyamic-acid solution (2) (10.0g) obtained by the method of the synthesis example 2, and it stirred at 25 degreeC for 4 hours. Then, BCS (15.7g) was added, it stirred at 25 degreeC for 6 hours, and obtained the liquid-crystal aligning agent (2). Abnormalities such as turbidity and precipitation were not observed in this liquid-crystal aligning agent, and it was a homogeneous solution.

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Abstract

Provided is a reverse-type liquid crystal display device that has a high vertical alignment property, good optical properties, that is, good transparency when no voltage is applied and good scattering property when a voltage is applied, also high adhesion between a liquid crystal layer and a liquid crystal alignment film, and ability to maintain these characteristics even in an environment where the device is exposed to high temperature, high humidity and light irradiation for a long time. A transmissive-scattering reverse-type liquid crystal display device has a liquid crystal layer obtained by curing a liquid crystal composition including a liquid crystal disposed between a pair of substrates having electrodes and a polymerizable compound by applying active energy rays and / or heat, and also includes a liquid crystal alignment film on at least one of the substrates, the device being in a transparent state when no voltage is applied and in a scattering state when a voltage is applied. The liquid crystal display device is characterized in that the liquid crystal alignment film is obtained from a liquid crystal alignment treatment agent including the following component (A) and component (B): component (A): a compound having a group of the following formula [1]; component (B): a polymer having at least one structure selected from the following formula [2-1] and formula [2-2]. [1] * represents a binding site with another structure. The definitions of [2-1] and [2-2] symbols are as described in the description.

Description

technical field [0001] The present invention relates to a transmissive-scattering reverse mode (reverse mode) liquid crystal display element that is in a transparent state when no voltage is applied and that is in a scattering state when a voltage is applied. Background technique [0002] As a liquid crystal display element, a TN (Twisted Nematic: twisted nematic) mode is put into practical use. In this mode, it is necessary to use a polarizer in order to switch light using the optical rotation characteristics of the liquid crystal. If a polarizing plate is used, the utilization efficiency of light will become low. [0003] As a liquid crystal display element not using a polarizing plate, there is an element that switches between a transmissive state (also referred to as a transparent state) and a scattering state of liquid crystal. Generally, elements using polymer dispersed liquid crystal (also called PDLC (Polymer Dispersed Liquid Crystal)) and polymer network liquid cr...

Claims

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Application Information

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IPC IPC(8): G02F1/1337C08G73/10G02F1/13G02F1/1334
CPCC08G73/10G02F1/1337G02F1/13G02F1/1334G02F1/133711C08L79/08C08K5/46
Inventor 铃木加名子片山雅章高桥真文保坂和义
Owner NISSAN CHEM IND LTD
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