Reflective optical filter, preparation method thereof and reflective display device

Abstract

A reflective optical filter comprises a first substrate, a second substrate and a liquid crystal layer, wherein the first substrate and the second substrate are oppositely arranged, a first electrodeis arranged on the inner side of the first substrate, a second electrode is arranged on the inner side of the second substrate, the liquid crystal layer is filled with a liquid crystal composition comprising cholesteric liquid crystals. The reflective optical filter comprises at least two reflection areas for reflecting light of different colors. Liquid crystal molecules are oriented by applying an external electric field, and additional liquid crystal alignment treatment is not needed, so that the manufacturing process is simple, and the cost is saved; chiral inversion of the chiral compoundis induced by ultraviolet light, and partition control of a reflection region is realized in the same parent liquid crystal material, so that the electrode does not need to be subjected to patterningtreatment, a whole common electrode is arranged, a retaining wall does not need to be arranged, and the manufacturing process is simplified; in addition, due to the fact that the high polymer materialis added, the reflective color filter can form a flexible film material, a large-area roll-to-roll processing mode can be achieved easily, and therefore the production and transportation cost of thefilter is reduced.

Description

technical field [0001] The present application relates to the field of display technology, in particular to a reflective filter, a preparation method thereof, and a reflective display device. Background technique [0002] Color filters are widely used in the display field. Most of the traditional color filters are absorbing filters, and their light loss rate can reach more than 60%, which limits the light energy utilization rate of liquid crystal displays to a large extent. In addition, traditional color filters are generally prepared by dispersing red, green, and blue dyes in photoresists, and then forming red color resists, green color resists, and blue color resists on the substrate through three yellow light processes. The preparation process is complex and cumbersome. [0003] To sum up, the existing absorbing color filter technology needs to be improved. Contents of the invention [0004] Embodiments of the present application provide a reflective filter, a prepara...

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Problems solved by technology

[0004] The embodiments of the present application provide a reflective filter, its preparation method, and a reflective display device, so as to solve the technical problems of the existing absorbing color filter, which has a high light loss rate and a cumbersome and complicated preparation process.

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