Display Panel Sub-Pixel Light Shielding for Curved Edges
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Solution Overview
Problem
Display panels with irregularly shaped display regions, such as those with curved edges, suffer from issues like visibly stair-step edges and unintended colors due to unequal sub-pixel opening areas, leading to degraded display quality.
Innovation Solution
A display panel design where sub-pixel light-shielding sections are sized to maintain equal ratios of opening areas for pixels both with and without the light-shielding section, ensuring uniform light transmission and preventing stair-step edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a light-shielding curved section is used to create a curved display region edge, then the display region can have an irregular shape for increased designability, but the curved edge region becomes visibly in the shape of stairs and unintended colors are displayed
Solution Approach 1:
The light-shielding curved section is divided into multiple light-shielding sections, each corresponding to a specific pixel. Within each pixel, sub-pixel light-shielding sections are provided for individual sub-pixels (R, G, B). This segmentation allows precise control of light shielding at the sub-pixel level, enabling curved edge formation while maintaining uniform sub-pixel opening area ratios and preventing stair-step artifacts and color distortion.
Solution Approach 2:
The patent applies different light-shielding configurations to different regions: pixels completely inside the curved boundary have full opening areas, pixels completely outside have no opening areas, and pixels intersected by the curved boundary have proportionally reduced opening areas. This local differentiation ensures that each pixel's light transmission matches its positional relationship with the curved boundary, eliminating visual artifacts while maintaining design flexibility.
2Shape
If sub-pixels at the curved edge have different opening areas from standard pixels, then the curved display region can be formed, but unintended colors are displayed and display quality is degraded
Solution Approach 1:
The patent dynamically adjusts the opening area parameters of sub-pixels based on their position relative to the curved boundary. For pixels intersected by the boundary, the opening areas of R, G, and B sub-pixels are proportionally reduced while maintaining their original ratios. This parameter adjustment ensures that the chromaticity and brightness characteristics remain consistent with standard pixels, preventing color distortion while achieving the desired curved shape.
3Manufacturing precision
If the light-shielding section entirely covers pixels at the curved edge, then unintended colors are prevented, but the curved edge becomes visibly in the shape of stairs
Solution Approach 1:
Instead of making the light-shielding section a simple two-dimensional curved line that creates stair-step effects, the patent extends the solution into the third dimension by providing separate sub-pixel light-shielding sections for R, G, and B sub-pixels within intersected pixels. This three-dimensional approach allows continuous curvature representation while maintaining color uniformity, as each sub-pixel's light shielding is independently optimized.
Data Source
AI summary
To prevent the display quality from being degraded as a result of (i) a boundary portion of an edge region of the display region being visibly in the shape of stairs and/or (ii) emitted light having an unintended color, a display panel includes a light-shielding section including, for each pixel (5) through which a curved boundary line (ideal line) extends, sub-pixel light-shielding sections (3a) each overlapping a corresponding one of a red sub-pixel (4R), a green sub-pixel (4G), and a blue sub-pixel (4B).