OLED substrate, manufacturing method thereof, and display device

Abstract

The invention discloses an OLED substrate, a manufacturing method thereof, and a display device. The OLED substrate includes a base substrate and a pixel defining layer located on the base substrate, a first electrode, a second electrode and an organic light-emitting layer, and the organic light-emitting layer is located between the first electrode and the second electrode In between, the pixel defining layer includes a plurality of pixel defining patterns, each of the pixel defining patterns is provided with a groove structure, and sub-pixel units are defined between the pixel defining patterns, and the organic light-emitting layer is located in the sub-pixel units. in pixel units. The OLED substrate, its manufacturing method, and the technical proposal of the display device provided by the present invention reduce the display crosstalk phenomenon between adjacent sub-pixels, and improve the color shift phenomenon of OLED devices at low gray scales.

Description

technical field [0001] The invention relates to the field of display technology, in particular to an OLED substrate and a manufacturing method thereof, [0002] display device. Background technique [0003] At present, in the manufacturing process of the OLED device, during the evaporation process, since the mask plate is not directly attached to the upper OLED substrate, there is a certain distance between them. During evaporation, since the organic material is evaporated from bottom to top, the area of ​​the organic material evaporated on the OLED substrate is often larger than the area of ​​the opening of the mask plate, and the excess area of ​​the actual evaporated organic material is called shadow. When there is an error in the alignment between the OLED substrate and the mask plate, it is easy to cause shadow overlapping between the evaporated electroluminescent layers in adjacent sub-pixel units, and even cause the electroluminescent layers in adjacent sub-pixel uni...

AI Technical Summary

Problems solved by technology

When there is an error in the alignment between the OLED substrate and the mask plate, it is easy to cause shadow overlapping between the evaporated electroluminescent layers in adjacent sub-pixel units, and even cause the electroluminescent layers in adjacent sub-pixel units to overlap. The phenomenon that the shadow of one electroluminescent layer is located on the other electroluminescent layer in the luminescent layer, making it easy to display crosstalk between adjacent sub-pixels

[0004] At the same time, due to the existence of the above phenomenon, at low gray scales, when controlling the light emission of an electroluminescent layer, the holes flow from the anode to the cathode and are easy to generate lateral transport at the same time, and the laterally transported holes are transported through the hole The layer or the hole injection layer flows to the electroluminescent layer adjacent to the electroluminescent layer, thereby causing the phenomenon that when the electroluminescent layer emits light, the adjacent electroluminescent layer also emits light, which in turn leads to the OLED device in the Color cast occurs at low gray levels

Similarly, at low gray levels, when controlling the light emission of an electroluminescent layer, electrons flow from the cathode to the anode, and at the same time, it is easy to generate a lateral leakage current. The electroluminescent layer is adjacent to the electroluminescent layer, which causes the phenomenon that when the electroluminescent layer emits light, the adjacent electroluminescent layer also emits light, which in turn leads to the phenomenon of color shift in OLED devices at low gray scales.

[0005] Therefore, in the prior art, due to the existence of the above phenomenon, display crosstalk is prone to occur between adjacent sub-pixels, and at the same time, OLED devices are prone to color shift at low gray scales.

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