Polyimide oriented film preparation method

Abstract

The invention discloses a polyimide oriented film preparation method. The method comprises the steps that a polyimide polymer solution is uniformly smeared on a glass substrate; a linearly polarized laser is used to irradiate the polyimide polymer solution on the substrate for polymerization; the polyimide polymer solution smeared on the substrate is subjected to precuring treatment, wherein the precuring temperature is 80-100 DEG C; the polyimide polymer solution on the substrate after precuring treatment is subjected to curing treatment, wherein the curing temperature is 180-200 DEG C; and an oriented film, which is cured and formed, is taken off and checked to complete preparation. The polyimide polymer solution contains a siloxane compound, ethyl alcohol and glutarimide, all of which are mixed. According to the method, the linearly polarized laser is used for irradiation and polymerization immediately after the polyimide polymer is smeared on the glass substrate, so that siloxane compound molecules are connected to a polyimide molecular chain, and control over a pre-tilt angle of liquid crystals of a display screen can be realized just by controlling the content of the siloxanecompound molecules in the polymer.

Description

technical field [0001] The invention belongs to the technical field of preparation of alignment films, in particular to a preparation method of polyimide alignment films. Background technique [0002] In the past, liquid crystal displays using the STN display mode have the problems of small viewing angle, color loss of the picture when viewed from a larger side angle, and poor contrast and color performance. In order to solve this problem, people have developed a wide viewing angle technology. ADS, that is, advanced ultra-dimensional field switching technology, forms a multi-dimensional electric field through the electric field generated by the edge of the slit electrode in the same plane and the electric field generated between the slit electrode layer and the plate electrode layer, so that the gap between the slit electrodes and the electrodes in the liquid crystal cell All aligned liquid crystal molecules directly above can be rotated, thereby improving the working effic...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing a polyimide alignment film in order to solve the problem that the alignment liquid on the electrode is dissolved with a dissolving agent, which will affect the display effect of the display screen, in order to solve the problem of high requirements for the preparation of the existing alignment film.