How to make a liquid crystal grating

Abstract

The invention discloses a method for manufacturing a liquid crystal grating. The method comprises the following steps of: providing two substrates, and respectively paving an adhesive layer and an alignment layer on the two substrates; etching the adhesive layer to form a plurality of etching regions, and exposing the alignment layer to form a plurality of exposure regions of which the number is consistent with that of the etching regions; and filling each etching region with a liquid crystal mixture, and bonding the two substrates to enable the plurality of etching regions to be bonded to theplurality of exposure regions in a one-to-one correspondence manner to form the liquid crystal grating. According to the invention, the volume gratings in different areas are integrated on the same substrate, the substrate with the plurality of exposure regions and the substrate with the plurality of etching regions are bonded to form the liquid crystal volume grating, splicing of a plurality ofglass substrates is not needed, and the situation of light leakage at the edge of the glass substrate of the liquid crystal volume grating is avoided; and the thickness of each grating of the liquid crystal grating is adjustable, so that the diffraction efficiency of the liquid crystal grating is adjusted, the process compatibility is good, and the flexibility is high.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to a method for manufacturing a liquid crystal grating. Background technique [0002] The diffraction efficiency of the liquid crystal grating is related to the liquid crystal Δn (birefringence) and the thickness of the grating. Under the condition that the liquid crystal Δn is kept constant, the diffraction efficiency can be adjusted by adjusting the thickness of the grating. At present, liquid crystal gratings are usually produced by splicing or spraying multiple glass substrates. The splicing of multiple glass substrates is to coat the grating in-coupling region, turning region and out-coupling region on multiple different glass substrates. A plurality of glass substrates are then spliced ​​together, but the glass edge of the liquid crystal grating made by this splicing method is prone to light leakage, which reduces the diffraction efficiency of the liquid crystal grating. Alt...

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