Liquid crystal vertical self-alignment additive as well as preparation method and application thereof

Abstract

The invention relates to a liquid crystal vertical self-alignment additive as well as a preparation method and application thereof. The liquid crystal vertical self-alignment additive has a structureas shown in a general formula I, wherein R1 represents alkyl, alkoxy, alkenyl or alkenyloxy with 0-10 carbon atoms; a ring A represents a 1,4-phenylene group or a 1,4-cyclohexylidene group; Z1 and Z2independently represent a single bond, -O-, -S-, -CO-, -CO-O-, -O-CO-, -O-CO-O-, -CH=N-, -N=CH-, -N=N-, a carbon-carbon triple bond, a C1-C12 alkylene group or a C2-C12 alkenyl; P1 and P2 independently represent an acrylate group, a methacrylate group, a fluorinated acrylate group, a chlorinated acrylate group, an ethyleneoxy group, an oxetane group or an epoxy group; L1 and L2 independently represent a hydrogen atom, a fluorine atom, or an alkyl group or alkoxy group having 1-5 carbon atoms; R2 represents an alkyl group having 0-10 carbon atoms; m represents 0 or 1; when m is equal to 0, R1 is 0; l represents 0, 1 or 2; r1 and r2 independently represent 0, 1, 2, 3 or 4; and n represents 1, 2, 3, 4 or 5.

Description

technical field [0001] The invention belongs to the technical field of liquid crystal materials, and relates to a liquid crystal vertical self-alignment additive and a preparation method and application thereof. Background technique [0002] In recent years, liquid crystal display devices have been widely used in various electronic devices such as smartphones, tablets, car navigation systems, and televisions. Representative liquid crystal display modes include twisted nematic (TN) type, super twisted nematic (STN) type, in-plane switching (IPS) type, fringe field switching (FFS) type and vertical alignment (VA) type. Among them, the VA mode has received more and more attention due to its fast fall time, high contrast, wide viewing angle and high-quality images. [0003] In conventional VA displays, after the glass substrate is made into electrodes, its surface needs to be coated with a layer of polyimide (PI) alignment film to achieve vertical alignment of liquid crystal mo...

AI Technical Summary

Problems solved by technology

However, this method has obvious shortcomings: the coating process of PI alignment film is cumbersome and takes a long time, which greatly increases the production cost

Rubbing alignment type PI alignment film will generate dust and static electricity during the rubbing process, which will affect the performance of the liquid crystal medium, and even damage the liquid crystal display element during the rubbing process; although the photo alignment type PI alignment material avoids the above defects, its effect on the liquid crystal The molecular anchoring ability is weak, and its application is also limited by the constraints of its own material properties.

Images