Preparation method of aligned film

Abstract

The invention relates to the technical field of displaying and discloses a preparation method of an aligned film. The preparation method includes: coating a substrate with PI (propidium iodide) liquid covering a valid area and an invalid area of the substrate, and solidifying the PI liquid; removing the part, located in the invalid area of the substrate, of the solidified PI liquid to form a pattern of the aligned layer. According to the preparation method, distinguishing the invalid area and the valid area of the substrate is not required when the PI liquid is applied to the substrate; the invalid area of the substrate is controlled in such a manner that the part, located in the invalid area of the substrate, of the solidified PI liquid to form the pattern of the aligned layer; at this moment, the PI liquid is solidified and has no fluidity, and accordingly, the invalid area of the substrate is convenient to control when the preparation method is used in preparing the aligned layer.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a method for preparing an alignment film. Background technique [0002] In the field of display technology, the manufacturing process of liquid crystal display devices is mainly divided into three parts, namely, the preparation of array substrates, the preparation of color filter substrates, and the box alignment of array substrates and color filter substrates; among them, the box alignment of array substrates and color filter substrates The first process at this time is the preparation process of the alignment film. [0003] In the prior art, the preparation process of the alignment film mainly includes five parts: substrate cleaning, PI (Polyimide, polyimide) liquid coating, pre-drying, PI detection, and main curing. Wherein, the PI liquid coating is a step of coating the PI liquid on the substrate, specifically coating the PI liquid on the transfer plate, and then transferri...

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Problems solved by technology

[0005] However, since the PI liquid coated on the transfer plate is in a liquid state, when the PI liquid is applied to the substrate through the transfer plate, it will flow due to the fluidity of the PI liquid, so that the PI liquid cannot pass through the transfer plate when it is coated. Strictly control the invalid area on the substrate; especially with the narrower frame of the liquid crystal display device, the wireless area on the substrate is getting narrower, and the transfer plate is used in the preparation process of the alignment film to carry out the ineffective area on the substrate. It is becoming more and more difficult to control

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