OLED Pixel Electrode Recesses for Color Purity
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Solution Overview
Problem
In organic electroluminescent display devices, as pixels miniaturize, light emitted from one pixel can penetrate to adjacent pixels, causing color mixture due to the continuous formation of organic films, which leads to unwanted light leakage and color contamination.
Innovation Solution
The implementation of pixel electrodes with recessed depressed portions on their peripheries, accompanied by corresponding recessed insulating and common layers, and a sealing layer that diffusely reflects or bends light, preventing it from being recognized as adjacent pixel light, thereby minimizing color mixture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pixels are miniaturized to improve display quality, then pixel density increases, but light from one pixel penetrates to adjacent pixels causing color mixture
Solution Approach 1:
The pixel electrode is divided into a light-emitting region and a depressed portion (non-light-emitting region). This segmentation creates a physical barrier that prevents light from adjacent pixels from being recognized, thereby solving the color mixture problem while maintaining high pixel density
Solution Approach 2:
The depressed portion acts as an intermediary structure between adjacent light-emitting regions. By introducing this intermediate non-light-emitting zone, light from one pixel cannot directly reach the adjacent pixel's light-emitting region, thus preventing color mixture
2Ease of manufacture
If organic films are continuously formed to simplify manufacturing, then production process is easier, but light leakage occurs between adjacent pixels
Solution Approach 1:
The pixel electrode structure is made non-uniform by adding depressed portions at specific locations. This local structural modification allows the continuous organic film to serve its function while the localized depressed regions prevent light leakage, resolving the contradiction between manufacturing simplicity and light 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 color mixture between adjacent pixels by diffusely reflecting or bending light within the depressed portions, ensuring accurate color representation in high-quality display devices.
Implementation Method 1
since the light generated in the organic layer is diffusely reflected, diffuses, or is bent in the depressed portions of the pixel electrodes
Implementation Method 2
since the light generated in the organic layer is diffusely reflected, diffuses, or is bent in the depressed portions of the pixel electrodes
Data Source
AI summary
An insulating layer is disposed in areas between pixel electrodes adjacent to each other so as to rest on peripheries of the pixel electrodes. An organic layer is disposed to include a common layer that continuously covers the pixel electrodes and the insulating layer. A common electrode is disposed on the organic layer. A sealing layer conducts sealing to cover the organic layer and the common electrode. The pixel electrodes have depressed portions whose upper surfaces are recessed on ends including the peripheries of the pixel electrodes. The common layer has depressed portions whose upper surfaces are recessed in correspondence with the depressed portions of the pixel electrodes. The common electrode has depressed portions whose upper surfaces are recessed in correspondence with the depressed portions of the common layer. The sealing layer is curved in correspondence with the depressed portions of the common electrode.