Optical composite membrane based on PDLC (Polymer Dispersed Liquid Crystal) device and preparation method of optical composite membrane

Abstract

The invention discloses an optical composite membrane based on a PDLC (Polymer Dispersed Liquid Crystal) device and a preparation method of the optical composite membrane. The PDLC device is composed of a PDLC layer, the optical composite membrane is positioned on the two sides of the PDLC layer and sequentially includes a transparent conductive layer, an optical matching layer, a flexible base and a water-vapour barrier layer from the PDLC layer out , wherein, the flexible base is made of an organic polymer material, the water-vapour barrier layer adopts organic oxide, the material of optical matching layer is selected from one or a combination of SiO2, MgF2 and Nb2O5; the preparation method includes: provision of the flexible base; preparation of the optical matching layer and the transparent conductive layer on the flexible base through a magnetron sputtering method; preparation of the water-vapour barrier layer through an atomic layer deposition method on the other side of the flexible base. The Al2O3 membrane prepared by the method through a winding ALD method has superstrong water-vapour barrier property; the thickness of the water-vapour barrier layer prepared is thin, and the coating time and raw material consumption are reduced on the basis that the excellent optical property of the materials is maintained, therefore the production cost is reduced.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to an optical composite film based on a PDLC device and a preparation method thereof. Background technique [0002] As we all know, polymer dispersed liquid crystal (PDLC) is a kind of liquid crystal with low molecular weight mixed with prepolymer, under certain conditions, through polymerization reaction, forming micron-sized liquid crystal droplets uniformly dispersed in the polymer network, and then using liquid crystal Dielectric anisotropy of molecules yields materials with electro-optic responsive properties. PDLC does not need polarizers and alignment layers in the display process, and the preparation process is also very simple, so it has a wide range of application prospects. However, glass as a traditional substrate is increasingly restricting the development of PDLC display technology, mainly because the glass substrate is not only heavy, thick and fragile, but also not...

AI Technical Summary

Problems solved by technology

However, there are still many defects and deficiencies in the water vapor barrier films currently on the market.

First, the water vapor barrier performance is low, and the service life of the device cannot be fundamentally guaranteed; second, most water vapor barrier films are obtained through multi-layer composites, which increases coating time and raw material consumption, increases production costs, and affects the optical performance of the entire device. (such as transmittance, etc.) will also be adversely affected; third, the water vapor barrier film is often damaged during transportation and use; fourth, the current water vapor barrier technology needs to invest in new equipment and production lines, which improves production. cost

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