Organic electroluminescent display panel and preparation method thereof

Abstract

The invention relates to the technical field of display, and discloses an organic electroluminescent display panel and a preparation method thereof. The organic electroluminescent display panel comprises a substrate, wherein one side of the substrate is provided with a pixel defining layer, the pixel defining layer has multiple openings, the bottom of each opening is provided with a first electrode layer, the projection area of each first electrode layer on the substrate is less than the projection area of the corresponding opening on the substrate, an annular gap is formed between each firstelectrode layer and the pixel defining layer, and each first electrode layer is provided with a light emitting layer at the side away from the substrate. In the organic electroluminescent display panel, the annular gap is formed between each first electrode layer and the pixel defining layer, a coffee ring generated by the light emitting layer is enabled to be located in a region corresponding tothe annular gap, and the thickness of the light emitting layer in a region corresponding to the first electrode layer is enabled to be uniform, thereby avoiding a problem of uneven display caused by the formation of the coffee ring in the light emitting layer corresponding to the first electrode layer, and effectively improving the display effect of the display panel.

Description

technical field [0001] The invention relates to the field of display technology, in particular to an organic electroluminescence display panel and a preparation method thereof. Background technique [0002] AMOLED organic electroluminescent display panels have been commercialized. The mature AMOLED panel technology manufacturing process is evaporation process. Its main disadvantage is that the utilization rate of materials is relatively low, resulting in high cost; the emerging AMOLED panel technology manufacturing process It is an inkjet printing process, and the material utilization rate through the inkjet printing process is high. [0003] Existing inkjet printing technologies such as Figure 1 to Figure 2 As shown, the light-emitting layer 03 formed after the drying of the organic ink material 02 has a coffee ring effect, and the coffee ring is located in the area of ​​the first electrode 01, which makes the uniformity of the light-emitting film worse and easily causes p...

AI Technical Summary

Problems solved by technology

[0002] AMOLED organic electroluminescent display panels have been commercialized. The mature AMOLED panel technology manufacturing process is evaporation process. Its main disadvantage is that the utilization rate of materials is relatively low, resulting in high cost; the emerging AMOLED panel technology manufacturing process For the inkjet printing process, the material utilization rate through the inkjet printing process is high

[0003] Existing inkjet printing technologies such as Figure 1 to Figure 2 As shown, the light-emitting layer 03 formed after the drying of the organic ink material 02 has a coffee ring effect, and the coffee ring is located in the area of ​​the first electrode 01, which makes the uniformity of the light-emitting film worse and easily causes poor panel display

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