Pixel defining layer and its preparation method, display substrate and display device comprising it

Abstract

A pixel defining layer, a preparation method thereof, a display substrate and a display device containing it. The present invention provides a pixel defining layer, comprising a bank portion defining a plurality of pixel regions, the bank portion comprising a lower portion of the bank portion adjacent to a substrate and an upper portion of the bank portion above, wherein the bank portion The upper part is sequentially stacked with a first inorganic material pattern layer and a lyophobic pattern layer formed by a self-assembled monomolecular layer on the first inorganic material pattern layer; and / or the lower part of the bank is sequentially stacked with a second inorganic material pattern layer and a lyophilic pattern layer formed from a self-assembled monomolecular layer on the second inorganic material pattern layer. The invention adopts the method of coating and depositing a layer of inorganic material on the surface of traditional PDL, and the formed inorganic material can only form a thin layer, which solves the problem that the thickness of the inorganic material is too thick when traditional different materials are alternately formed into films, thereby improving Equipment utilization and capacity. At the same time, the surface modification of the pixel-defining layer is carried out by self-assembled single molecules, so as to achieve the purpose of improving the hydrophilic / lyophobic properties of the surface.

Description

technical field [0001] The present invention relates to the field of display technology, in particular to a pixel defining layer, a preparation method thereof, a display substrate and a display device including the layer. Background technique [0002] In the printing process, in order to achieve the purpose of lyophilicity of the substrate and lyophobicity of the pixel definition layer (PDL), or the purpose of lyophilicity of the sidewall of the film-forming area and lyophobic purpose of the non-film-forming area, strict requirements are usually imposed on the material, but In the current materials, after cleaning, the contact angle is generally below 90°, and generally can only reach 50°. [0003] US Patent No. 6,476,988B1 proposes to construct a PDL by sequentially laminating a variety of materials with different properties, but the process is too complicated, and the preparation of each layer requires a photolithography step; moreover, it requires the cooperation of fluor...

AI Technical Summary

Problems solved by technology

However, due to the characteristics of the plasma, its performance is maintained for too short a time, so that it may fail when faced with a long-term manufacturing process or a high-temperature annealing process.

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