Preparation method of organic light-emitting display panel

By employing a multilayer expandable layer technology on the driving substrate of an organic light-emitting display panel, anodes and light-emitting layers of different color sub-pixels are formed layer by layer, solving the problems of low luminous efficiency and limited color gamut in the prior art, and realizing the fabrication of organic light-emitting display panels with high PPI and high luminous efficiency.

CN120835718APending Publication Date: 2025-10-24NANJING LUMICORE TECH LTD
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Patent Information

Application Number
CN202510938522.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-08
Publication Date
2025-10-24

AI Technical Summary

Technical Problem

The existing organic light-emitting display manufacturing process has problems with low luminous efficiency and limited color gamut. Especially at high PPI (greater than 3000), the white OLED + color filter manufacturing process is difficult to meet the requirements of high efficiency and wide color gamut.

Method used

By employing multilayer expandable layer technology, anode and light-emitting layers of different color sub-pixels are prepared on the driving substrate. By expanding and removing the expandable layers, a monochromatic organic light-emitting display panel is formed layer by layer, avoiding the use of fine photomasks. Inkjet printing and chemical vapor deposition processes are used to improve accuracy and reduce costs.

Benefits of technology

A high PPI organic light-emitting display panel was achieved, which has high luminous efficiency and wide color gamut, and the manufacturing cost was reduced by simplifying the process.

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Abstract

The invention discloses a preparation method of an organic light-emitting display panel. Comprising the steps of preparing a driving substrate; preparing an anode layer on one side of the driving substrate, wherein the anode layer comprises a first anode in the first color sub-pixel, a second anode in the second color sub-pixel and a third anode in the third color sub-pixel; preparing a first expandable layer on the sides, away from the driving substrate, of the second anode and the third anode; preparing a first color light-emitting layer on the sides, away from the driving substrate, of the first anode and the first expandable layer; expanding the first expandable layer, and removing the first expandable layer and the first color light-emitting layer located on the side, away from the driving substrate, of the first expandable layer; and with reference to the process of preparing the first color light-emitting layer, preparing a second color light-emitting layer on one side of the second anode, and preparing a third color light-emitting layer on one side of the third anode. By adopting the preparation method, the organic light-emitting display panel of which each sub-pixel can realize monochromatic light emission and which has high PPI can be prepared, the light efficiency is high, and the color gamut is wide.
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