Light Shielding Structure for Profiled Display Panel Edges
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Solution Overview
Problem
Irregularly shaped display panels with non-rectangular display areas face issues with pixel arrangement at profiled edges, leading to saw-toothed gullets and a negative impact on visual effect due to incomplete matching of sub-pixels and boundary lines.
Innovation Solution
A display panel design featuring a light shielding structure with light shielding units corresponding to edge pixels, where each edge pixel comprises sub-pixels with equal shielding areas, and the orthographic projection of these units covers the sub-pixels' ends near the non-display area, creating an arc boundary line that reduces the edge saw-tooth effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If pixels are arranged along the boundary line at the profiled edge to match the non-rectangular shape, then the display area shape is improved, but the sub-pixels cannot be completely matched with the boundary line resulting in saw-toothed gullets and poor visual effect
Solution Approach 1:
The patent extracts the light shielding function from the traditional black matrix structure and creates independent light shielding units corresponding to each edge pixel. These units are specifically designed to cover the saw-toothed regions at the profiled edge, separating the light shielding function from the regular pixel array structure and addressing the visual effect problem at irregular boundaries.
Solution Approach 2:
The patent applies different structures to different regions: regular pixels in the main display area and specialized light shielding units at the profiled edge. The light shielding units have asymmetric designs with different shielding areas for different sub-pixels (e.g., covering more of the blue sub-pixel than red), creating local quality variations that match the specific geometric requirements of the profiled edge.
2Ease of manufacture
If light shielding units are designed with equal shielding areas for all sub-pixels, then the manufacturing process is simplified, but the brightness transition at the edge becomes unnatural and the visual effect deteriorates
Solution Approach 1:
The light shielding units are designed with non-uniform shielding areas for different sub-pixels within the same edge pixel. For example, in a triangular arrangement, the unit may cover 70% of the blue sub-pixel, 50% of the green sub-pixel, and 30% of the red sub-pixel. This local variation in shielding quality creates natural brightness gradients that improve visual effect while maintaining a relatively simple manufacturing process.
3Manufacturing precision
If the orthographic projection of light shielding units covers the ends of sub-pixels near the non-display area, then the arc boundary line is formed reducing saw-tooth effect, but the light shielding structure becomes more complex
Solution Approach 1:
The patent employs curved or arc-shaped boundary lines for the light shielding units instead of straight edges. This curvature allows the orthographic projection to smoothly cover the ends of sub-pixels near the profiled edge, creating a rounded appearance that eliminates the saw-tooth effect. The curved geometry is achieved through standard photolithography processes, maintaining manufacturing feasibility while reducing visual artifacts.
4Adaptability or versatility
If irregularly shaped display panels are produced to meet diverse device requirements, then the adaptability is improved, but the pixel arrangement at profiled edges becomes difficult to control and visual quality decreases
Solution Approach 1:
The patent divides the light shielding structure into discrete, independently controllable units corresponding to each edge pixel. This segmentation allows flexible adaptation to various irregular shapes (circular, sector, free-form) while maintaining precise control over pixel arrangement. Each light shielding unit can be independently designed and positioned, enabling the display to accommodate diverse device requirements without compromising visual quality.
Data Source
AI summary
A display panel, a display device, and a color filter substrate are provided. The profiled edge region of the display panel comprises a plurality of edge pixels. The profiled edge region is provided with a light shielding structure, and the light shielding structure includes a light shielding unit set in one-to-one correspondence with the plurality of edge pixels. Each plurality of edge pixels includes a plurality of sub-pixels arranged side by side in the first direction.