Liquid crystal composition and dimming device thereof

Abstract

The invention provides a liquid crystal composition capable of being applied to a dimming device. The liquid crystal composition comprises a first component, a second component and a third component,wherein the first component is composed of one or more compounds selected from a general formula I, the second component is composed of one or more compounds selected from a general formula II, and the third component consists of one or more chiral compounds. The invention also provides the dimming device containing the liquid crystal composition. The liquid crystal composition disclosed by the invention can be applied to a bistable dimming device; the liquid crystal composition has relatively high stability of electrical properties, enables the dimming device to have significantly reduced transmission state haze and maintain ultrahigh fog state haze, improves the stability of the electrical properties of the dimming device, and improve the brightness of the dimming device.

Description

technical field [0001] The invention relates to the field of liquid crystals, in particular to a liquid crystal composition and a dimming device thereof. Background technique [0002] As a device applying the photoelectric effect, the liquid crystal-based dimming device is mainly composed of a transparent substrate and a liquid crystal material. It regulates the alignment state of liquid crystal molecules through an external electric field, thereby realizing the conversion between full transparency and opaque. Due to this unique dimming feature, liquid crystal-based dimming devices (such as smart glass) are widely used in construction, home furnishing, automobiles and other industries to achieve functions such as adjusting light transmittance, increasing privacy, and blocking ultraviolet or infrared rays. Among them, bistable or multi-stable dimming glass has a broader application prospect because it does not require electric field maintenance and is energy-saving and safe. ...

AI Technical Summary

Problems solved by technology

Usually in this kind of dimming glass, the cholesteric liquid crystal has a periodic helical structure, but this structure is greatly affected by the interface conditions and the external environment. Exposure to water vapor, etc.) will cause the instability of the liquid crystal material, resulting in an abnormal distribution of electron clouds inside the liquid crystal material molecules, causing changes in the electrical properties of the liquid crystal material-based dimming glass, and ultimately resulting in the optical properties of the dimming glass The overall uniformity of the switchable glass becomes worse, which not only affects the appearance of the product, but also easily causes privacy leakage, thus limiting the further application of switchable glass

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