OLED Sub-pixel Curved Edges Eliminate Mura
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Solution Overview
Problem
The encapsulation process in OLED manufacturing is limited by the formation of mura due to the straight edges of sub-pixels, which affects the display quality and is not suitable for narrow frame designs, as the organic insulating material spreads unevenly during the leveling process.
Innovation Solution
The electroluminescent display panel features pixel structures with edges that include a first portion gradually away from a straight line, where the extending direction does not coincide with the intersecting direction, allowing for irregular edge shapes such as curves or polygons, which prevents regular mura formation by altering the spreading state of the organic insulating material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sub-pixels have straight edges, then the manufacturing process is simple, but mura defects occur during the leveling process of organic insulating material
Solution Approach 1:
The patent applies curvature to the edges of sub-pixels by replacing straight edges with arc-shaped edges. This curvature design prevents the organic insulating material from concentrating at sharp corners during the leveling process, thereby eliminating mura defects while maintaining manufacturing simplicity. The arc edges allow for uniform material distribution without requiring complex manufacturing processes.
2Device complexity
If sub-pixels have straight edges, then the pixel structure is simple, but display quality deteriorates due to mura formation
Solution Approach 1:
The patent introduces arc-shaped edges to sub-pixels to eliminate mura defects that occur with straight edges. This curvature modification improves display quality consistency by preventing organic material concentration at corners, while adding minimal complexity to the pixel structure. The arc edges can be easily integrated into existing pixel designs.
3Reliability
If traditional encapsulation methods are used, then water and oxygen protection is provided, but the frame width must be large to accommodate fringe coating
Solution Approach 1:
The arc-shaped edge design enables effective film encapsulation with reduced frame width by preventing organic material concentration at corners. This allows the use of narrower frames while maintaining encapsulation effectiveness, as the curved edges eliminate the need for extensive fringe coating regions required by traditional straight-edge designs.
Data Source
AI summary
An electroluminescent display panel and manufacturing method thereof, and a display device are provided. The electroluminescent display panel includes a base substrate, pixel structures disposed on the base substrate; and an encapsulating layer disposed on the pixel structures. The pixel structures are arranged in an array, the pixel structure including a plurality of sub-pixels arranged in an array, the pixel structure array has a first direction and a second direction intersected with each other, the edge of the sub-pixel including a first portion gradually away from a straight line where the first direction lies, and an extending direction of the first portion does not coincide with the second direction.