PDLC (polymer dispersed liquid crystal) display module

Abstract

The invention discloses a PDLC (polymer dispersed liquid crystal) display module which comprises an upper transparent conducting film, a lower transparent conducting film and a PDLC layer arranged between the two transparent conducting films, wherein each of the transparent conducting film comprises an anti-reflection structure and a substrate, the anti-reflection structure comprises a dielectric layer-an antioxidant metal layer-a metal conducting layer-the antioxidant metal layer-the dielectric layer, the antioxidant metal layer is made from zinc or titanium, the substrates in the two transparent conducting films are arranged face to face, and the anti-reflection structures in the two transparent conducting films are arranged outwards to form a back-to-back structure. Under the condition that the overall thickness of the transparent conducting films used by PDLC is far smaller than that of the existing ITO (indium tin oxide) films, excellent optical properties and electric properties are realized, and large-scale and large-area production can be realized. At the same time, as the anti-reflection part is in the back-to-back structure, voltage can be directly exerted on the external sides of the transparent conducting films, and the complexity of the outside wiring process of the PDLC is greatly reduced.

Description

technical field [0001] The invention relates to the PDLC display field, in particular to a PDLC display module with a transparent conductive film with high light transmission performance. Background technique [0002] Polymer dispersed liquid crystal (PDLC) is a smart dimming film that controls the transmittance by adjusting the voltage. PDLC is to disperse small molecular liquid crystal (LC) in a transparent polymer matrix. The polymer provides a stable network structure for liquid crystal droplets, and small molecular liquid crystals form micron or nanometer-sized liquid crystal particles. When no voltage is applied, the liquid crystal molecules are arranged in disorder, and the incident light is refracted and reflected multiple times at the interface between the liquid crystal molecules and the polymer matrix, showing a white scattering state. When a voltage is applied, the liquid crystal molecules will be aligned along the direction of the electric field, so that the in...

AI Technical Summary

Problems solved by technology

Larger thickness will result in increased cost and price disadvantage

A research group of Shanghai Jiaotong University proposed a three-layer structure of dielectric layer / metal layer / dielectric layer, with a thickness of less than 100nm and good conductivity and visible light transmittance. However, because the metal layer is easily oxidized, resulting in The service life is not high, and there are still big problems in actual production and use (patent application number: 03116461.7)

In addition, the traditional ITO is used as the main material of the transparent conductive film, the target material is expensive, the surface of the flexible substrate needs to be hardened and coated with a refractive index matching layer before coating, and crystallization treatment is required after coating, resulting in production costs. a substantial increase in

[0005] Therefore, the deficiencies of the current PDLC products are mainly due to the following factors: 1. When preparing the ITO film, annealing treatment and surface hardening treatment of the substrate are required, resulting in high production costs; 2. ITO does not have Anti-reflection effect, if the anti-reflection film is designed according to the regular film system, the thickness will exceed more than 200 nanometers, which also increases the production cost and raw material consumption; 3. The square resistance value of the transparent conductive ITO film is as high as 100-150Ω / □, The drive voltage of the device is large and the response is slow; 4. The current PDLC products need special leads to lead out the inner ITO transparent conductive film due to the "face-to-face" structure of the ITO layer, which makes the wiring more complicated.

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