Wide-viewing-angle liquid crystal spatial light modulator

Abstract

The invention provides a wide-viewing-angle liquid crystal spatial light modulator, and belongs to the technical field of liquid crystal devices. The wide-viewing-angle liquid crystal spatial light modulator has the advantages that the wide-viewing-angle liquid crystal spatial light modulator is provided with reflecting layers, the reflecting layers comprise pixel units, light sensing regions andlight blocking regions, the pixel units are formed by metal reflecting materials arranged on the surface of a light sensitive layer and are distributed in an arrayed manner, the light sensing regionsare connected with the various pixel units, each pixel unit is filled with light absorption materials to form the corresponding light blocking region, metal reflecting units are arranged on partial upper surfaces of each light blocking region to form a metal isolation mesh, a conductive layer is only arranged on the surface of a glass substrate close to the sides of the light sensing regions, thelight sensing regions and the conductive layer are jointly used as an electrode, the metal isolation meshes are used as another electrode, and accordingly liquid crystal molecules can be driven by coplanar horizontal electric fields formed between every two optional adjacent metal light sensing regions and the corresponding metal reflecting units when the wide-viewing-angle liquid crystal spatiallight modulator is in a powered-on state; the viewing-angle performance of devices can be improved on the basis of the structure of the wide-viewing-angle liquid crystal spatial light modulator, and viewing angles can be broadened; the wide-viewing-angle liquid crystal spatial light modulator is structurally improved, and accordingly the light sensitivity and imaging effects of the devices can beimproved.

Description

technical field [0001] The invention belongs to the technical field of liquid crystal devices, and in particular relates to a liquid crystal spatial light modulator with a wide viewing angle. Background technique [0002] A spatial light modulator (Spatial Light Modulator, SLM) means that under active control, it can modulate a certain parameter of the light field through liquid crystal molecules, such as modulating the phase through the refractive index, modulating the polarization state through the rotation of the polarization plane, or realizing The conversion of incoherent to coherent light, so as to write certain information into the light wave, achieve the purpose of light wave modulation. [0003] Spatial light modulators can generally be divided into reflective and transmissive according to the way the readout light is read out; and can be divided into optical addressing (OA-SLM) and electrical addressing (EA-SLM) according to the way of input control signals. -SLM)...

AI Technical Summary

Problems solved by technology

[0006] (1). The viewing angle is narrow; when the linearly polarized light of the same intensity is incident at different angles, due to the change of the effective refractive index, it becomes elliptically polarized light. After passing through the second polarizer, the outgoing light intensity with different incident angles is no longer equal. Cause viewing angle problem, its viewing angle is less than 40°

[0007] (2). The response speed is slow; the twisted nematic mode liquid crystal light valve works in a natural fallback mode. Since there is no other external force, its response speed exceeds 40ms

[0008] (3). Low contrast; the twisted nematic liquid crystal light valve uses the optical rotation characteristics of liquid crystal, and the contrast is low, especially the dark state is not dark enough.

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