Optical directional material improving optical directional performance of liquid crystal and its preparing method

A technology for photo-alignment and photo-sensitive materials, applied in the field of photo-sensitive materials, can solve problems such as a single polymer material, and achieve the effect of improving the contrast ratio and improving the alignment effect of liquid crystal

Inactive Publication Date: 2007-05-23
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, photo-alignment technology is mainly realized by photo-alignment polymer materials, and the types and quantities of polymer materials used have been very rich, including polyimide, polysiloxane, polyurethane, epoxy resin, polyvinyl alcohol, etc. Photo-alignment polymer materials, but most of them are single polymer materials. To meet the requirements of practical applications, the existing materials still need to be greatly improved in the uniform stability of oriented liquid crystals, display contrast and other directional properties.

Method used

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  • Optical directional material improving optical directional performance of liquid crystal and its preparing method
  • Optical directional material improving optical directional performance of liquid crystal and its preparing method
  • Optical directional material improving optical directional performance of liquid crystal and its preparing method

Examples

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Comparison scheme
Effect test

Embodiment 1

[0059] The preparation method of the photo-alignment material in this embodiment includes the following steps:

[0060] 1) Synthesis of photosensitive materials:

[0061] (a) Preparation of cinnamoyl chloride: Add 14.8g (0.100mol) cinnamic acid into a three-necked flask equipped with a reflux condenser and a gas absorber, and gradually add 7.5mL (12.3g, 0.105mol) with a dropping funnel under stirring Thionyl chloride was reacted for 4-10 hours under the condition that the temperature was controlled by a water bath at 40-70° C. to obtain white solid cinnamoyl chloride.

[0062] (b) Synthesis of bisphenol A dicinnamate: Add 1.140g (5mmol) bisphenol A, 2mL anhydrous pyridine and 10mL anhydrous tetrahydrofuran into a three-necked flask equipped with a reflux condenser, slowly drop in an ice-water bath Add 1.689g (10.2mmol) of cinnamoyl chloride in anhydrous tetrahydrofuran, and after all the addition is completed, the temperature is raised to 70°C for 4-10hr. The reaction produc...

Embodiment 2

[0070] In this embodiment, the photo-alignment material and its preparation method include the following steps:

[0071] 1) with embodiment 1

[0072] 2) with embodiment 1

[0073] 3) Mix bisphenol A dicinnamate and BP-AN-CA at a ratio of 10% to obtain the material for improving the photo-alignment effect of liquid crystals described in the present invention.

[0074] The liquid crystal alignment effect of this embodiment:

[0075] Step 3) The obtained material has a good liquid crystal alignment effect, and the contrast ratio of the liquid crystal cell is increased by 90% compared with that of a single polymer BP-AN-CA liquid crystal cell on the basis of ensuring the uniformity and stability of the aligned liquid crystal.

Embodiment 3

[0077] The preparation method of the photo-alignment material in this embodiment includes the following steps:

[0078] 1) with embodiment 1

[0079] 2) with embodiment 1

[0080] 3) Mix bisphenol A dicinnamate and BP-AN-CA at a ratio of 20% to obtain the material for improving the photo-alignment effect of liquid crystals described in the present invention.

[0081] The liquid crystal alignment effect of this embodiment:

[0082] Step 3) The obtained material has a good liquid crystal alignment effect, and the contrast ratio of the liquid crystal cell is increased by 30% compared with that of a single polymer BP-AN-CA liquid crystal cell on the basis of ensuring the uniformity and stability of the aligned liquid crystal.

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Abstract

The invention discloses a material to improve the LCD-oriented directional optical properties fabrication methods, which belongs to photosensitive materials technology. The photosensitive materials are mixed of epoxy resin-based materials and polymer-oriented materials. Those two containing materials corporations are cinnamoyl cyclization reaction, thereby induced liquid crystal alignment. The material for the preparation methods is to replace the benzene ring cinnamic acid and slightly excessive thionyl chloride and so on the benzene ring completely replace the cinnamon chloride solution Solutions to increase with the acid absorbent polar aprotic solvents, phenol or two polyphenol solution drop wise, be used doped photosensitive materials, photosensitive materials to be epoxy-based polymers for optical orientation of mixed-orientation was obtained material. This invention can improve LCD-directional capability of a single polymer-oriented material, and also achieve proper optical directional effects by choosing the type of photosensitive materials and the ratio of them.

Description

technical field [0001] The invention belongs to the technical field of photosensitive materials, and in particular relates to a photo-alignment material for an alignment layer of a liquid crystal display and a preparation method. Background technique [0002] Polymer photosensitive materials and related technologies are one of the key areas of scientific research on polymer materials, which can be widely used in many aspects of the electronics and optoelectronics industries. One of its potentially important applications is as a liquid crystal photo-alignment layer material. High-quality liquid crystal displays require liquid crystals to have a stable and uniform initial alignment. Thin layers that induce liquid crystal alignment are called liquid crystal alignment layers. In order to obtain a uniform alignment along the plane, a variety of liquid crystal alignment methods have been reported in the literature in the past, such as: [0003] Inclined evaporation method: This...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1337
Inventor 张玥于海峰连彦青王晓工
Owner TSINGHUA UNIV
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