A kind of substrate and its preparation method, display device

Abstract

Embodiments of the present invention provide a substrate, a preparation method thereof, and a display device, which relate to the field of display technology and can solve the problem of uneven thickness of a light-emitting functional layer formed in an opening area of ​​an existing pixel defining layer. The preparation method of the substrate includes: forming a pixel defining layer thin film on a base substrate; wherein, the material of the pixel defining layer thin film includes photoresist, an affinity material doped in the photoresist, an elastic material and auxiliary particles; The particles are used to release gas when decomposed, and the elastic material is used to expand the pixel defining layer film when the auxiliary particles release the gas; the molecular weight of the affinity material, photoresist and elastic material is greater than the molecular weight of the auxiliary particles; the pixel definition The layer film is heated to make the auxiliary particles move away from the substrate; the pixel defining layer film is processed to form a pixel defining layer, and the auxiliary particles are decomposed to release gas. For the preparation of the pixel definition layer.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a substrate, a preparation method thereof, and a display device. Background technique [0002] Organic Electro-luminescent Display (OLED) has many advantages such as self-luminescence, high luminous efficiency, low operating voltage, light and thin, flexible and simple manufacturing process, and has been widely used in display, lighting and other fields. application. [0003] At present, there are two film-forming methods for the light-emitting layer in OLED devices. One is the evaporation process, which is suitable for the production of small-sized OLED devices; the other is the solution process, which includes spin coating, inkjet printing or screen printing etc. The method of film formation by solution process is widely used in the production process of OLED devices due to its advantages of low cost, high production capacity, and being suitable for the production of large-s...

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Problems solved by technology

[0005] Embodiments of the present invention provide a substrate and its preparation method, and a display device, which can solve the problem of uneven thickness of the light-emitting functional layer formed in the opening area of ​​the existing pixel defining layer

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