Liquid crystal composite film with writing display function and preparation method thereof

Abstract

The invention belongs to the field of liquid crystal display and particularly discloses a liquid crystal composite film with a writing display function and a preparation method thereof. The liquid crystal composite film with the writing display function comprises a PET transparent film, a PVA insulating orientation layer, a liquid crystal / polymer / interval microsphere composite layer and a PET black film sequentially from top to bottom. The lower surface of the PET transparent film is coated with an ITO layer, and the upper surface of the PET black film is coated with an ITO layer. The liquid crystal composite film with the writing display function and the preparation method thereof have advantages that due to addition of the PVA insulating orientation layer, short circuit risks of two conductive layers are avoided, and accordingly the rate of finished products is sharply increased, service lives of the products are greatly prolonged, production cost is reduced, and the driving voltage of the liquid crystal film is lowered to increase key technical indexes such as brightness and contrast ratio of the film.

Description

technical field [0001] The invention belongs to the field of liquid crystal display, in particular to a liquid crystal composite film with writing display function and a preparation method thereof. Background technique [0002] The liquid crystal composite film with writing display function can replace writing tools such as blackboards or whiteboards used in education, office and other fields in the future. This film utilizes the bistable characteristics of liquid crystals, and has the characteristics of showing a light reflection state under writing pressure, and the writing can be completely erased when a voltage is applied. Specifically, this film can achieve perfect writing only by reflecting external light when writing, thereby achieving the purpose of reducing product power consumption. Secondly, this kind of film can be written with only fingertip-like tools without using any consumables. In particular, it can let teachers say goodbye to the chalk dust brought by tra...

AI Technical Summary

Problems solved by technology

[0003] At present, the structure of the traditional liquid crystal composite film used by manufacturers of liquid crystal writing boards is that the liquid crystal polymer is directly poured between the PET transparent film and the PET black film. The advantages of this structure are that the production process is simple and the production cycle is short, but However, there are many disadvantages, such as the very small distance between two layers of ITO films, the risk of contact short circuit, low product yield, short service life, high driving voltage, etc.

In order to overcome these defects of traditional liquid crystal composite films, the current common method is to increase the monomer content, and reduce the risk by increasing the size of solid microspheres and increasing the polymer content, but the improvement is not obvious, and increasing the solid microsphere The size of the microspheres will increase the distance between the ITO layers, and the driving voltage will increase accordingly; increasing the polymer content will lead to a decrease in the regularity of the liquid crystal arrangement, which in turn affects the brightness of the liquid crystal reflection and the overall contrast, which greatly limits The use of LCD tablet

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