Electronically controlled optical diffraction element based on multistable liquid crystal composition and its manufacturing method

Abstract

The present invention provides a multi-stable liquid crystal composition, comprising: the first component is at least one compound represented by general formula (I); the second component is at least one compound represented by general formula (II); The first component and the second component constitute a smectic phase liquid crystal composition; the third component is an organic ion whose structure is at least one compound represented by general formulas (III), (IV) and (V). The invention also provides an electrically controlled optical diffraction element prepared by using the above materials and a preparation method thereof. The multi-stable liquid crystal composition provided by the present invention can be stably maintained in the scattering and transparent states when the power is off, so that the system can be switched between normally black and normally white modes arbitrarily when the system is used for an optical diffusion sheet in 3D recognition. In addition, high Δn monomeric liquid crystal is specially added to make the mixed liquid crystal system have high optical anisotropy, so that it has a good scattering effect in the infrared band (940nm), and can be used as a diffuser for optical elements in 3D recognition.

Description

technical field [0001] The invention belongs to the field of liquid crystal application technology, and relates to a multi-stable liquid crystal (MSLC) composition that can be used to improve the scattering effect in 3D recognition. The display element prepared by using the material and the preparation method thereof can be widely used in liquid crystal display, smart Glass, liquid crystal light valve, 3D recognition and other related fields. Background technique [0002] Adding a liquid crystal light valve that can switch between the scattering state and the transparent state at the front of the DOE light source can switch between the DOE dot matrix and the flood light source, so that it can be applied to 3D property scanning such as face recognition and obstacle judgment of sweeping robots. The liquid crystal-like material can be realized by using PDLC / PNLC material polymer dispersed liquid crystal / network liquid crystal. However, whether it is PDLC or PNLC material syste...

AI Technical Summary

Problems solved by technology

Since the birefringence Δn of the liquid crystal is generally not large, the light transmittance in the scattering state is high, the scattering ability is weak, and the light uniformity is poor.

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