OLED Anode Edge Coverage via Pixel Defining Layer Segmentation
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Solution Overview
Problem
In OLED display panel manufacturing, the planarization layer is prone to volatilization and outgassing during heating processes, requiring openings in the anode layer to prevent gas blockage, but these openings often remain uncovered by the pixel defining layer, exposing edges of the anode layer and leading to oxidation and etching issues.
Innovation Solution
The display panel design includes a base substrate with a planarization layer having varying distances from the substrate, featuring first and second hollowed regions in the anode layer, which are completely covered by corresponding covering parts from the pixel defining layer, ensuring edge coverage and preventing exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If openings are made in the anode layer to allow gas release from the planarization layer, then gas release is enabled and process yield is improved, but the anode layer edges at the openings become exposed and prone to oxidation and etching
Solution Approach 1:
The pixel defining layer is designed with different covering areas for different regions: first covering parts with larger areas for first hollowed regions, and second covering parts with smaller areas for second hollowed regions. This local differentiation ensures complete coverage of anode layer edges where needed while maintaining the gas release function, preventing oxidation and etching at vulnerable edges.
2Reliability
If the pixel defining layer completely covers the openings in the anode layer, then edge exposure and oxidation are prevented, but the gas release function is compromised
Solution Approach 1:
The pixel defining layer implements regional differentiation with first covering parts that completely cover first hollowed regions to prevent oxidation, and second covering parts that cover second hollowed regions while maintaining gas release pathways. This local quality approach ensures protection where needed while preserving functionality where gas release is required.
Solution Approach 2:
The pixel defining layer is segmented into multiple discrete covering parts (first covering parts and second covering parts) that are distributed across the frame region. Each covering part independently covers specific hollowed regions, allowing simultaneous achievement of edge protection and gas release functionality through spatial segmentation.
3Ease of manufacture
If uniform covering parts are used for all hollowed regions, then manufacturing is simplified, but complete coverage of anode layer edges cannot be ensured due to varying hollowed region sizes
Solution Approach 1:
The pixel defining layer employs non-uniform covering parts with different areas matched to different hollowed region sizes. First covering parts have larger areas for first hollowed regions, while second covering parts have smaller areas for second hollowed regions. This local quality differentiation ensures complete edge coverage for each hollowed region type while maintaining manufacturing feasibility through a systematic design approach.
Data Source
AI summary
Display panel and display device are provided. The display panel includes a display region and a frame region surrounding the display region. In the frame region, the display panel includes a base substrate, a planarization layer, an anode layer and a pixel defining layer. The planarization layer includes a first region and a second region. The anode layer includes first hollowed regions and second hollowed regions. The first hollowed regions at least partially overlap the first region, and the second hollowed regions at least partially overlap the second region. The pixel defining layer includes first covering parts and second covering parts. The first covering parts cover the first hollowed regions and extend to cover edges of the anode layer. The second covering parts cover the second hollowed regions and extend to cover edges of the anode layer. Orthographic projections of the first covering parts on the base substrate are larger than orthographic projections of the second covering parts on the base substrate.