Manufacturing method of liquid crystal display device

Abstract

A production method of a liquid crystal display device includes: assembling a lower substrate and an upper substrate oppositely; dividing the lower substrate and the upper substrate into a plurality of substrate units, wherein each substrate unit includes a first substrate and a second substrate which are assembled oppositely; filling liquid crystal materials between the first substrates and the second substrates of the substrate units to form a liquid crystal display unit, wherein the liquid crystal materials have a first density at first environment temperature; grinding the liquid crystal display unit after the environment temperature of the liquid crystal display unit rises from the first environment temperature to the second environment temperature, wherein the liquid crystal materials have a second density at the second environment temperature and the second density is smaller than the first density. The production method of the liquid crystal display device can effectively avoid unqualified little bright dots caused by scratching of alignment films, improve the product yield rate and reduce production cost.

Description

technical field [0001] The invention relates to the technical field of liquid crystal display, and in particular to a method for manufacturing a liquid crystal display device. Background technique [0002] In the assembly process of liquid crystal display panels, a large color filter substrate (Color Filter, CF) and a thin film transistor array substrate (Thin Film Transistor, TFT) are usually assembled together, and then divided into required sizes and then assembled. Carry out subsequent processes such as grinding and partial bonding. [0003] Among them, the surface of the color filter substrate facing the thin film transistor array substrate and the surface of the thin film transistor array substrate facing the color filter substrate are covered with a layer of alignment film (Polyimide, PI), which is used for subsequent filling in the color filter substrate and the thin film transistor array. The liquid crystal material of the substrate is aligned. After the color fil...

AI Technical Summary

Problems solved by technology

- During the grinding process, the first substrate and the second substrate will move relative to each other, causing the columnar spacers of the second substrate to scratch the first alignment film of the first substrate

After the alignment film is scratched, small particles will enter the liquid crystal layer or the liquid crystal will lose alignment after the alignment film is scratched, resulting in small bright spots.

At present, in order to reduce the defects of small bright spots, the alignment film with higher hardness and scratch resistance is usually selected, which involves the problem of material matching and results in limited material selection, or fine-tunes the grinding conditions during the grinding process, such as adjusting the grinding pressure, upper and lower discs Speed, grinding disc swing, swing frequency, grinding time, etc., which put forward strict requirements for the grinding process control

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