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Liquid crystal alignment agent for photo alignment, liquid crystal alignment layer for photo alignment, and liquid crystal display element

A liquid crystal alignment agent and photo-alignment technology, applied in liquid crystal materials, optics, nonlinear optics, etc., can solve problems such as low light transmittance, display defects, and poor display

Active Publication Date: 2013-11-13
JNC CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the rubbing method has the following problems: display defects caused by the adhesion of debris of the alignment film or fiber waste generated in the process, or thin film transistor (Thin Film Transistor, TFT) elements are destroyed due to static electricity, resulting in poor display Wait
[0007] On the other hand, the photo-alignment method has been pointed out to have the following problems: compared with the rubbing method, the anchoring energy (anchoring energy) is small, and the alignment of liquid crystal molecules is poor, which causes a decrease in the response speed of the liquid crystal display element or afterimage ( burn-in)
However, the photo-alignment film using polyamic acid produced from diamine having an azo group as a raw material has the following problems: the light transmittance is low, and the brightness of the liquid crystal display element is reduced.

Method used

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  • Liquid crystal alignment agent for photo alignment, liquid crystal alignment layer for photo alignment, and liquid crystal display element
  • Liquid crystal alignment agent for photo alignment, liquid crystal alignment layer for photo alignment, and liquid crystal display element
  • Liquid crystal alignment agent for photo alignment, liquid crystal alignment layer for photo alignment, and liquid crystal display element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0461] Hereinafter, the present invention will be described by way of examples. In addition, compounds used in Examples are as follows.

[0462]

[0463] Acid dianhydride (A1): 1,2,3,4-cyclobutanetetracarboxylic dianhydride

[0464] Acid dianhydride (A2): 1,2,3,4-tetramethyl-1,2,3,4-cyclobutanetetracarboxylic dianhydride

[0465] Acid dianhydride (A3): pyromellitic dianhydride

[0466] Acid dianhydride (A4): Butane tetracarboxylic dianhydride

[0467] Acid dianhydride (A5): 1,2,4,5-cyclohexanetetracarboxylic dianhydride

[0468] Acid dianhydride (A6): 3,3′,4,4′-biphenyltetracarboxylic dianhydride

[0469] Acid dianhydride (A7): ethylenediaminetetraacetic dianhydride

[0470]

[0471] Diamine (D1): 4,4′-Diaminodiphenylbutane

[0472] Diamine (D2): 4,4′-diaminodiphenylhexane

[0473] Diamine (D3): 4,4′-Diaminodiphenyloctane

[0474] Diamine (D4): 4,4′-diaminodiphenyldecane

[0475] Diamine (D5): 1,4-Phenylenediamine

[0476] Diamine (D6): 4,4′-diaminodiphenylamine ...

Synthetic example 1

[0496] 3.304 g of diamine (D1) and 40.0 g of dehydrated NMP were placed in a 100 mL four-necked flask equipped with a thermometer, a stirrer, a raw material inlet, and a nitrogen inlet, and stirred and dissolved under a dry nitrogen stream. Next, 2.696 g of acid dianhydride (A1) and 40.0 g of dehydrated NMP were added, and stirring was continued at room temperature for 24 hours. BC14.0g was added to this reaction solution, and the polyamic-acid solution whose polymer solid content density|concentration was 6 weight% was obtained. This polyamic acid solution was referred to as PA1. The viscosity of PA1 was 11 mPa·s, and the weight average molecular weight of the polyamic acid contained in PA1 was 22,000.

[0497] The weight average molecular weight of a polyamic acid is calculated|required by the GPC method using the 2695 separation module (seperation module) / 2414 differential refractometer (made by Waters), and it calculated|required by polystyrene conversion. The obtained p...

Embodiment 1

[0507] Add a mixed solvent of NMP / BC=4 / 1 (weight ratio) to the polyamic acid solution (PA1) with a polymer solid content concentration of 6% by weight prepared in Synthesis Example 1, and dilute the polymer solid content concentration to 4% by weight to make a liquid crystal alignment agent. Using the obtained liquid crystal alignment agent, the board|substrate for transmittance evaluation was produced as follows.

[0508]

[0509]The liquid crystal alignment agent was coated in the glass substrate by a spinner. In addition, including the following examples and comparative examples, the rotational speed was adjusted according to the viscosity of the liquid crystal alignment agent, and the alignment film was made to have the following film thickness. After forming the coating film and heating and drying at 80°C for 100 seconds, use the photo-alignment light source device APL-L01212S1-ASN01 manufactured by Ushio Electric Co., Ltd. to align the substrate from the vertical dire...

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PUM

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Abstract

The invention provides a liquid crystal alignment agent for photo alignment, a liquid crystal alignment layer for photo alignment, and a liquid crystal display element. The liquid crystal alignment agent provided by the invention has a polyamide acid or a derivative thereof, the polyamide acid or the derivative thereof may be formed by reacting a mixer of cyclobutane tetracarboxylic dianhydride or tetracarboxylic dianhydride with specific aromatic diamine of an alkyl chain of a molecule with a carbon number larger than 4. With the adoption of the liquid crystal alignment agent, a liquid crystal alignment layer good in sensitivity of chemical change caused by light irradiation, excellent in alignment property of liquid molecule and high in optical transmittivity is formed. In addition, by applying the photo alignment layer to the liquid crystal display element, the liquid crystal display element with excellent display characteristics can be obtained.

Description

technical field [0001] The invention relates to a liquid crystal alignment agent for photo-alignment using a photo-alignment method, a photo-alignment film and a liquid crystal display element using the liquid crystal alignment agent for photo-alignment. Background technique [0002] Various display devices such as personal computer monitors, LCD TVs, video camera view finders, projection displays, and optical printer heads, Nematic liquid crystal is used in liquid crystal display elements that are currently manufactured and widely distributed, such as optical Fourier transform elements, light valves, and other optoelectronics-related elements. The display components are mainstream. Regarding the display mode of a nematic liquid crystal display element, a twisted nematic (Twisted Nematic, TN) mode and a super twisted nematic (Super Twisted Nematic, STN) mode are widely known. In recent years, in order to improve the narrow viewing angle, which is one of the problems of the...

Claims

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Application Information

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IPC IPC(8): C09K19/56C08G73/10C08G73/12G02F1/1337
CPCG02F1/133723C09K19/56C08G73/1025C08G73/106C08G73/1075C08G73/1085C08K5/544C08L79/08C08K5/5419
Inventor 山内孝浩松田智幸近藤史尚
Owner JNC CORP
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