Display substrate, manufacturing method thereof and display device

Abstract

The invention discloses a display substrate, a manufacturing method thereof and a display device, and belongs to the technical field of display. The method comprises the following steps: forming a flat layer on a substrate, wherein the flat layer is provided with a convex structure; forming an anode on the substrate on which the flat layer is formed, wherein the anode is at least positioned on one surface, far away from the substrate, of the convex structure; a pixel defining layer is formed on the substrate where the anode is formed, the pixel defining layer comprises a pixel area defined by a retaining wall structure, the orthographic projection of the pixel area on the substrate covers the orthographic projection of the protruding structure on the substrate, and the edge area of the pixel area is flush with the face, away from the substrate, of the anode; and forming a light-emitting layer in the pixel region through an ink-jet printing process, wherein the light-emitting layer is connected with one surface, far away from the substrate, of the anode. The problem that the uniformity of the luminance of the light-emitting layer is poor is solved, and the uniformity of the luminance of the light-emitting layer is improved. The manufacturing method is used for manufacturing the display substrate.

Description

[0001] This application is a divisional application of a Chinese patent application with an application date of April 9, 2019, an application number of 201910281690.5, and an invention title of "display substrate and its manufacturing method, and display device". technical field [0002] The present application relates to the field of display technology, and in particular, to a display substrate, a manufacturing method thereof, and a display device. Background technique [0003] Electroluminescent display devices such as polymer light-emitting diodes (PLED for short) have the advantages of thinness, low power consumption, high contrast ratio, high color gamut and flexible display, and are widely used in the display industry. [0004] Electroluminescent display devices mainly rely on electroluminescent display substrates for display. The electroluminescent display substrate generally includes a base substrate and a thin film transistor (English: Thin Film Transistor; abbrevia...

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Problems solved by technology

[0005] However, during the drying process of the luminescent material solution in the pixel area, the luminescent material solution is prone to a "coffee ring effect", resulting in a difference in the thickness of the edge region and the thickness of the central region in the finally formed luminescent layer. The uniformity of the thickness of the layer is poor, resulting in poor uniformity of the luminous brightness of the light-emitting layer

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