Tandem OLED Pixel Layout With Recessed CGL Isolation
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Solution Overview
Problem
Tandem OLED display panels face pixel crosstalk issues due to lateral conduction of the charge generation layer, which affects the performance and accuracy of the display.
Innovation Solution
Incorporating a recess in the pixel defining layer between adjacent pixel units, where the charge generation layer is disconnected, and ensuring the cathode layer is continuous at the recess, preventing lateral charge conduction and maintaining proper pixel illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the charge generation layer is continuous between adjacent pixel units, then the pixel units can be normally illuminated, but lateral conduction occurs causing pixel crosstalk
Solution Approach 1:
The charge generation layer is segmented into isolated regions corresponding to individual pixel units, with recesses in the pixel defining layer preventing lateral connection between adjacent pixels. This segmentation eliminates charge leakage to adjacent pixels while maintaining sufficient charge generation within each pixel unit.
Solution Approach 2:
The pixel defining layer is designed with different local properties: regions over pixel units have sufficient thickness to allow charge generation, while regions between pixel units (recesses) have reduced thickness to prevent charge lateral conduction. This local differentiation resolves the contradiction between continuous illumination and crosstalk prevention.
2Productivity
If the spacing between adjacent pixel units is reduced to increase aperture ratio, then the display efficiency is improved, but charge lateral conduction between pixels increases
Solution Approach 1:
The solution moves from a two-dimensional planar structure to a three-dimensional vertical structure by creating recesses in the pixel defining layer. This vertical dimension allows reduced horizontal spacing between pixels while maintaining charge isolation through the recess depth, enabling high aperture ratio without crosstalk.
Solution Approach 2:
The charge generation layer is segmented by the recesses in the pixel defining layer, creating electrically isolated regions for each pixel. This segmentation allows pixels to be placed closer together horizontally while the vertical recess structure prevents charge lateral conduction, thus increasing aperture ratio without sacrificing pixel isolation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively prevents pixel crosstalk, ensures normal pixel operation, and increases the aperture ratio of the organic electroluminescent display panel by reducing spacing between adjacent pixels.
Implementation Method 1
Organic Electroluminescent Display panel (represented by Organic Light Emitting Diode (OLED))
Data Source
AI summary
The present disclosure relates to an organic electroluminescent display panel, a method of manufacturing the same, and a display device that can alleviate or avoid the occurrence of pixel crosstalk problems due to lateral conduction of the charge generation layer. An organic electroluminescent display panel is provided which comprises: a substrate; an anode layer and a pixel defining layer over the substrate, the pixel defining layer defining pixel units, wherein a recess is provided in the pixel defining layer between adjacent pixel units; a stack of organic electroluminescent units over the anode layer and the pixel defining layer, the stack comprising at least two organic electroluminescent units and a charge generation layer disposed between organic electroluminescent units which are adjacent to each other; a cathode layer over the stack, wherein the corresponding charge generation layers of the adjacent pixel units are disconnected at the recesses, and wherein the cathode layer is continuous at the recess.