PI liquid coating method

Abstract

The invention provides a PI liquid coating method. A first light cover and a second light cover are adopted, wherein the length of the first light cover and the length of the second light cover are equal to the width and length of a substrate respectively. A first shading area and a second shading area are arranged on the wide edge of the first light cover and the wide edge of the second light cover, wherein the width of the first shading area and the width of the second shading area are equal to the width of frame adhesives. After irradiating the substrate through the first light cover for the first time, an ultraviolet light source is rotated by 90 degrees and irradiates the substrate through the second light cover for the second time; a second area located on the substrate is irradiated by ultraviolet light twice, and therefore the concentration of organic matter is low. A first area is irradiated less than two times, the concentration of organic matter is high, PI liquid is not dispersed to the first area from the second area easily, the precision of PI liquid coating is controlled, the quality of an alignment film is improved, and defects of products are reduced.

Description

technical field [0001] The invention relates to the technical field of liquid crystal display, in particular to a PI liquid coating method. Background technique [0002] With the development of display technology, liquid crystal displays (Liquid Crystal Display, LCD) and organic light emitting diode displays (Organic Light Emitting Diode, OLED) and other flat display devices are widely used due to their advantages of high image quality, power saving, thin body and wide application range. It is widely used in various consumer electronics products such as mobile phones, televisions, personal digital assistants, digital cameras, notebook computers, and desktop computers, and has become the mainstream of display devices. [0003] Most of the liquid crystal displays currently on the market are backlight liquid crystal displays, which include a liquid crystal display panel and a backlight module. The working principle of the liquid crystal display panel is to pour liquid crystal ...

AI Technical Summary

Problems solved by technology

[0005] In the actual coating process of PI liquid, the coating effect of PI film is often affected by the state of TFT or CF substrate surface

PI liquid is generally a hydrophilic substance, and it is easy to spread unevenly on the surface with a lot of organic residues, which will cause broken bright spots in TFT-LCD products and affect the quality of the product

In addition, in the process of coating PI liquid by inkjet printing, the accuracy of PI liquid coating is generally controlled by changing the pattern of PI liquid, so that the PI liquid is evenly coated in the display area of ​​the substrate, but this method When the surface state of the substrate is inconsistent, it may cause the PI liquid to diffuse beyond, which will affect the coating of the sealant or produce peripheral defects.

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