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Processing method of photo-alignment layer in suitable relative humidity range

A processing method and relative humidity technology, applied in optics, nonlinear optics, instruments, etc., can solve problems such as unguaranteed alignment quality and achieve good alignment quality

Active Publication Date: 2021-03-30
THE HONG KONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, whether it is a non-composite azo dye or a composite layer formed by azo dyes, polymer monomers and photo or thermal initiators, the quality of alignment cannot be guaranteed, and there is a need to improve the processing method of the photo-alignment layer in this field to ensure the quality of alignment. need

Method used

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  • Processing method of photo-alignment layer in suitable relative humidity range
  • Processing method of photo-alignment layer in suitable relative humidity range
  • Processing method of photo-alignment layer in suitable relative humidity range

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1 Effect of Relative Humidity on the Photoalignment Quality of Non-composite Azo Dye Films

[0028] In the glove box, place the name tetrasodium 5,5'-((1E,1'E)-(2,2'-disulfonic acid-[1,1'-biphenyl]-4,4'-bis base) bis(diazene-2,1-diyl)) bis(2-hydroxybenzoic acid) (hereinafter referred to as SD1) pure sulfate-based azo dyes dissolved in dimethylformamide solvent at a concentration of 1% Afterwards, the substrate was uniformly covered by spin coating, and the azo dye film covered on the substrate was soft baked at 100°C for 10 minutes, and then the film was placed in a sealed cabin and removed from the glove box, and then the sealed cabin was mixed with humidity The generator is connected to obtain the required relative humidity inside and after equilibrium, use 5mW / cm 2 Linearly polarized 365nm UV light irradiation.

[0029] Under different relative humidity, use 5mW / cm 2 While irradiating with linearly polarized 365nm ultraviolet light, the phase retardation...

Embodiment 2

[0034] Embodiment 2 relative humidity is to the compound that the mixture of azo dye material, polymer monomer and photoinitiator forms The influence of the photoalignment quality of the object layer

[0035] Azo dye SD1, polymer monomer 4-(3-acryloyloxypropoxy)-benzoic acid 2-methyl-1,4-phenyl ester, photoinitiator 1-hydroxy-cyclohexyl-benzene The base-ketone was dissolved in dimethylformamide solvent. Wherein the azo dye and the polymer monomer are mixed in a weight ratio of 1:1, and the respective weight percentages of the azo dye and the polymer monomer relative to the solvent are 1%. The weight percentage of the photoinitiator relative to the monomer is 20%. Afterwards, the azo dye complex film was evenly covered on the substrate by spin coating, and the substrate was put into a closed compartment and directly removed from the glove box. Then the airtight cabin is connected with a humidity generator to obtain the required relative humidity inside and after equilibri...

Embodiment 3

[0040] Embodiment 3 relative humidity is to the compound that the mixture of azo dyestuff material, polymer monomer and thermal initiator forms The influence of the photoalignment quality of the object layer

[0041] Azo dye SD1, polymer monomer 4-(3-acryloyloxypropoxy)-benzoic acid 2-methyl-1,4-phenyl ester, thermal initiator 2-cyano-2-propane Dodecyl trithiocarbonate dissolved in dimethylformamide solvent. Wherein the azo dye and the polymer monomer are mixed in a weight ratio of 1:1, and the respective weight percentages of the azo dye and the polymer monomer relative to the solvent are 1%. The weight percent of the thermal initiator relative to the polymer monomer is 5%. Afterwards, the thermally polymerized azo dye complex film was uniformly covered on the substrate by spin coating, and the substrate was put into a closed compartment and directly removed from the glove box. Then the airtight cabin is connected with a humidity generator to obtain the required relativ...

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Abstract

The invention provides a method for processing a photoalignment layer in an appropriate relative humidity range. A photoalignment material that is used is a noncomposite azo dye, photopolymerized azodye compound material or thermopolymerized azo dye compound material, so that the photoalignment material uniformly covers a substrate, and is subjected to exposure to provide consistent alignment, and light is linearly polarized light. The quality of the photoalignment layer obtained by photoalignment under relative humidity is good.

Description

technical field [0001] The invention relates to the field of liquid crystal alignment, in particular to a processing method for an optical alignment layer. Background technique [0002] Alignment of liquid crystals is critical for most liquid crystal applications including liquid crystal displays (LCDs) as well as various photonic devices. The alignment film on the substrate can arrange the liquid crystal molecules in a certain direction. The most common method is mechanical brushing. However, mechanical brushing technology can bring static electricity and pollution that are not good for the application. [0003] The optical alignment technology of liquid crystal avoids these problems, has been developed rapidly, and has become a strong competitor to replace the brushing procedure in liquid crystal applications. It has been reported that photoalignment of azo dyes can provide anchoring energy comparable to that of commercial brushed polyimide films used in traditional LCD...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/1337G02F1/137
CPCG02F1/133711G02F1/133788G02F1/13737
Inventor 石玥郭海成何跃龙赵晨项
Owner THE HONG KONG UNIV OF SCI & TECH