A liquid crystal compound, a liquid crystal composition comprising the same, and a liquid crystal display device.

A liquid crystal compound with specific structural modifications addresses UV-induced performance degradation and low-temperature response issues, ensuring stable threshold voltage and fast response speed in high-end displays.

TWI932464BActive Publication Date: 2026-07-11SHIJIAZHUANG CHENGZHI YONGHUA DISPLAY MATERIALS CO LTD
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Patent Information

Application Number
TW114146978
Authority / Receiving Office
TW · TW
Patent Type
Patents
Current Assignee / Owner
Priority Date
2025-10-13
Filing Date
2025-12-02
Publication Date
2026-07-11
Estimated Expiration
2045-12-01

AI Technical Summary

Technical Problem

Existing liquid crystal monomers used in high-end displays suffer from significant changes in K-value and K11/Δε value due to UV irradiation, leading to degraded performance such as prolonged response time, threshold voltage drift, and decreased contrast, while their low-temperature response speed is insufficient for industrial and automotive applications.

Method used

A liquid crystal compound represented by Formula I with specific structural modifications, including alkyl, alkoxy, or alkenyloxy groups and ring replacements, is developed to maintain stability and fast response speed, featuring small changes in K-value and K11/Δε value after UV exposure.

Benefits of technology

The compound ensures stable threshold voltage, contrast, and fast response speed at low temperatures, addressing the degradation issues and meeting stringent performance demands in high-end displays.

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Abstract

This invention discloses a liquid crystal compound, a liquid crystal composition comprising the same, and a liquid crystal display device. The liquid crystal compound is a compound represented by Formula I, wherein X1 and X2 independently represent H, a halogen, an alkyl group with 1-10 carbon atoms, an alkoxy group with 1-10 carbon atoms, or an alkenyl group with 2-10 carbon atoms. X1 and X2 do not simultaneously represent H or a halogen, and if one of X1 and X2 is an alkyl, alkoxy, or alkenyl group, the other is not H. This liquid crystal compound has the advantages of small change in K value and K11 / Δε value after UV irradiation, and a fast low-temperature response speed. The liquid crystal composition comprising this liquid crystal compound also has the advantages of small change in K value and K11 / Δε value after UV irradiation, and a fast low-temperature response speed, and can be used to develop liquid crystal display devices with stable threshold voltage, stable contrast, and fast low-temperature response speed after UV irradiation.
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