A dual-frequency liquid crystal material with low critical frequency

Abstract

The invention discloses a double-frequency liquid crystal material having low critical frequency. The double-frequency liquid crystal material comprises 20.0-25.0% of an ingredient A, 20.0-25.0% of an ingredient B, 17.5-22.5% of an ingredient C, 7.5-12.5% of an ingredient D, 7.5-12.5% of an ingredient E, 5.0-10.0% of an ingredient F and 5.0-10.0% of an ingredient G, and the above material are melt and mixed. The ingredient A comprises a series of derivatives having cyclohexylfluorodiphenylacetylene skeleton structures, the ingredient B comprises a series of derivatives having fluorodiphenylacetylene skeleton structures, the ingredient C comprises a series of derivatives having cyclohexylbenzene ring skeleton structures, the ingredient D comprises a series of derivatives having diphenylacetylene skeleton structures, the ingredient E comprises a series of derivatives having three-ring monoester lateral fluoro-group-containing cyano-terminated skeleton structures, and the ingredient F comprises a series of derivatives having three-ring diester lateral dicyano-containing skeleton structures. The double-frequency liquid crystal material has low critical frequency, wide liquid crystalline phase temperature and low viscosity and can be used for preparation of a double-frequency driven liquid crystal device having low work voltage and fast response rate.

Description

technical field [0001] The invention belongs to the technical field of liquid crystal materials, and in particular relates to a dual-frequency liquid crystal material with low critical frequency and its application. Background technique [0002] The rod-like molecular shape of the liquid crystal determines that the liquid crystal has optical and electrical anisotropy. The main feature of the dual-frequency liquid crystal is that the dielectric constant decreases with the increase of the AC frequency, and the dielectric constant decreases with the increase of the AC frequency. The anisotropy is greater than zero (equivalent to positive liquid crystal), and the dielectric anisotropy is less than zero (equivalent to negative liquid crystal) at high AC frequency (greater than 100kHz), so that the dielectric anisotropy of dual-frequency liquid crystal is zero The frequency is called the critical frequency. Therefore, this type of liquid crystal material has strong polarity both ...

AI Technical Summary

Problems solved by technology

However, at present, the critical frequency of dual-frequency liquid crystal materials is relatively high (above 50kHz), and dual-frequency liquid crystal materials will have dielectric loss at high frequencies, which will affect the service life of liquid crystal devices.

Moreover, the high critical frequency causes the drive equipment that provides high frequency to be too bulky, which is not conducive to the use of dual-frequency LCDs on portable devices.

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