Liquid crystal composition and liquid crystal display device thereof

By using liquid crystal compositions of general-form O and general-form N compounds with specific structures, the problems of slow polymerization speed and uneven display in PSA-type liquid crystal displays have been solved, achieving efficient liquid crystal molecule alignment and stable display effect, suitable for large-size LCD panels.

CN118222301BActive Publication Date: 2026-07-24JIANGSU HECHENG DISPLAY TECH CO LTD
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Patent Information

Application Number
CN202211598578.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-12-13
Publication Date
2026-07-24
Estimated Expiration
2042-12-13

AI Technical Summary

Technical Problem

Existing PSA-type liquid crystal displays suffer from problems during production, such as slow polymerization speed, difficulty in controlling the polymerization process, poor miscibility between the self-aligning agent and the liquid crystal composition, uneven display, and image residue, making it difficult to meet the display quality requirements of large-size LCD panels.

Method used

Liquid crystal compositions containing general-form O and general-form N compounds with specific structures are used to achieve vertical alignment of liquid crystal molecules without a PI alignment layer by means of a self-aligning agent. By combining appropriate optical anisotropy, dielectric anisotropy and rotational viscosity, the polymerization rate and pre-tilt angle stability are optimized.

Benefits of technology

It achieves fast polymerization speed, controllable polymerization process, and uniform orientation of liquid crystal molecules, reduces polymer residue and roughness, improves low-temperature storage stability and pre-tilt angle stability, and enhances display effect.

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Abstract

The present application provides a liquid crystal composition and a liquid crystal display device thereof. The liquid crystal composition of the present application comprises at least one compound of general formula O and at least one compound of general formula N. The liquid crystal composition of the present application has smaller polymer residue, smaller roughness, better low-temperature storage stability, smaller contact angle, better alignment effect, and better pre-tilt angle stability, under the conditions of maintaining proper clearing point, proper optical anisotropy, proper absolute value of dielectric anisotropy, larger K value (K 11 and K 33 ) and smaller rotational viscosity, so that the liquid crystal display device comprising the same has proper threshold voltage, better contrast, better response speed, can effectively improve the problems such as "image sticking", display unevenness, "broken bright spots" and the like existing in the existing PSA type liquid crystal display, and has higher practical application value.
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