Optical alignment method and system for improving gamma pass rate

Abstract

The present application provides a photo-alignment method and system for improving the Gamma pass rate. The method includes the following steps: firstly applying a voltage to the liquid crystal panel to be aligned, and irradiating the liquid crystal panel with ultraviolet light for the first time, so that in the first preliminary At a set temperature, the photosensitive monomer moves to the alignment substrate, and a polymerization reaction occurs to form a polymer; and then the liquid crystal panel is cooled to a second preset temperature within a preset time, wherein the preset time is passed according to Gamma Finally, at the second preset temperature, the liquid crystal panel is irradiated with ultraviolet rays for the second time, so that the photosensitive monomer and the alignment substrate form an alignment film, so that the liquid crystal molecules are in a preset Angular alignment.

Description

technical field [0001] The present application relates to the technical field of liquid crystal panel manufacturing, and in particular to an optical alignment method and system for improving Gamma pass rate. Background technique [0002] The HVA photo-alignment technology in liquid crystal display is to apply voltage to the liquid crystal panel filled with liquid crystal and irradiate with ultraviolet light, so that the photosensitive monomer (Monomer) doped in the liquid crystal molecules and the PI alignment substrate are polymerized. A polymer is formed, and due to the interaction between the polymer and the liquid crystal molecules, the liquid crystal molecules are aligned along the direction of the polymer molecules to form the required pre-tilt angle for display. [0003] The HVA process is mainly divided into two alignment processes. The first ultraviolet light alignment is to apply voltage to the liquid crystal panel and irradiate it with ultraviolet light at a certa...

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Problems solved by technology

[0004] The first UV alignment requires a reaction temperature of 40 degrees or 50 degrees (different products vary), while the second UV alignment requires a temperature of 25 degrees at room temperature, from the first UV alignment to the second UV alignment The inter-process time is very short. According to the statistical data of 3 months, 56% are less than 2min, and 70% are less than 4min. In the process, the reaction rate of the photosensitive monomer is different due to the temperature difference, which is easy to cause the optical Gamma pass rate to be low.

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