Pixel defining layer and fabrication method and application thereof

Abstract

The invention relates to a pixel defining layer and a fabrication method and application thereof. The fabrication method comprises the following steps of providing a substrate, and coating photoresiston the substrate by a spin-coating process, wherein nanoparticles are added into the photoresist, the control parameters of the spin-coating process are as follows: the speed of (95-105) rotation perminute is continued for 9-11 seconds and the speed of (650-750) rotation per minute is continued for 9-11 seconds; and etching to remove the photoresist on a pixel region by a step exposure method, thereby obtaining the pixel defining layer. According to the fabrication method of the pixel defining layer, doping modification is performed on a Bank solution under the condition that an existing process is not changed, the volatilization rate of ink at different edges in the same sub-pixel is adjusted by a mode that hydrophilicity and hydrophobicity of a Bank edge in a single sub-pixel are different, so that the film formation effect is improved and optimized, and the effects of improving the yield of the device and improving the effect of the device are achieved.

Description

technical field [0001] The invention relates to the technical field of light-emitting devices, in particular to a pixel defining layer and its preparation method and application. Background technique [0002] With the gradual development of display technology, OLED has attracted the attention of all parties because of its excellent display performance. Companies such as LG, Samsung and BOE are gradually increasing their investment in OLED display technology. The production of OLEDs by conventional evaporation methods faces problems such as low material utilization. In order to further reduce the production cost of OLED screens, the production of OLEDs by printing methods has also been gradually put on the research and development and production schedules of major manufacturers. [0003] In the existing process, when printing OLEDs, it is necessary to make a pixel definition layer (PDL), also called Bank, for the printed pixel area. The Bank is an ink tank. During printing,...

AI Technical Summary

Problems solved by technology

In the actual production process, because the printed substrate is different from the center of the inner substrate to the upper edge of the substrate, the solvent vapor pressure is different, resulting in differences in the speed of the printed ink when it dries and forms a film, even within a single sub-pixel, because it volatilizes left and right The d

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