Active matrix electroluminescent device with improved resolution

By designing trenches and insulating filling elements to separate adjacent basic light-emitting areas in OLED displays, and combining conformal deposition and photolithography etching techniques, the crosstalk problem of microdisplays has been solved, enabling the manufacture of high-brightness and high-resolution OLED displays.

CN121241698APending Publication Date: 2025-12-30MICROOLED
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Patent Information

Application Number
CN202480025139.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2023-04-12
Filing Date
2024-04-11
Publication Date
2025-12-30

AI Technical Summary

Technical Problem

Existing OLED displays face severe crosstalk during miniaturization and have complex manufacturing processes, making it difficult to achieve micro-displays with extremely high spatial resolution and high brightness.

Method used

The structure of the electroluminescent display device is designed by forming trenches between the control electrodes of adjacent basic light-emitting areas and filling them with insulating surface filler elements to separate OLED stacks of different colors. Conformal deposition technology is used to protect the sidewalls of the OLED stacks, and a pixel matrix is ​​manufactured by combining photolithography and etching technology.

Benefits of technology

It effectively reduces lateral parasitic current, improves the brightness and resolution of the display, enables the manufacturing of extremely small basic light-emitting areas, simplifies the process flow, and reduces manufacturing complexity.

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Abstract

The present invention relates to an electroluminescent display device comprising an array of electroluminescent pixels consisting of a plurality of pixels deposited on a substrate (210), each pixel being formed by at least three elementary light-emitting regions, each elementary light-emitting region belonging to a different elementary light-emitting region group, each elementary light-emitting region comprising an electroluminescent stack (205) of organic layers, referred to as an "OLED stack", and a transparent upper electrode (207) placed between the control electrode (202) and the transparent upper electrode (207), the electroluminescent display device being characterized in that: two adjacent control electrodes (202a, 202b; 202b, 202c, 202c; 202c, 202a) are separated by a space (211) forming a trench, which covers at least the vertical sides of adjacent electrodes and electrically insulates them from each other, and two adjacent control electrodes (202a, 202a; the electrodes (202a, 202b, 2024, 202c) are separated by a space (211) forming the trench, which space is filled by a filling element (203) such that adjacent electrodes are electrically insulated from each other and fill the natural space between the two electrodes. In each group of basic light emitting regions, the entire OLED stack and its respective upper electrodes (205a and 207a, 205b and 207b, 205c and 207c) are separated from adjacent components belonging to the other group by an encapsulation layer (290) that protects the upper surface and sides of the OLED stack from ambient air.
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