Foldable Display Panel Sub-Pixel Curvature Stress Reduction
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Solution Overview
Problem
Current foldable display panels face stress concentration issues at diagonal corners of sub-pixels in bending areas, leading to potential detachment of the electroluminescence or thin film encapsulation layers during the folding process.
Innovation Solution
A foldable display panel design featuring elliptical or curved quadrilateral sub-pixel patterns in the foldable area and rhombus patterns in non-foldable areas, with a fold axis crossing sub-pixels, which reduces stress concentration and enhances the ability of sub-pixels to withstand bending, preventing layer detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If square sub-pixel pattern is used in foldable area, then manufacturing is easier, but stress concentration occurs at diagonal corners causing layer detachment
Solution Approach 1:
The patent applies curvature by changing the sub-pixel pattern from square to circular shape. The circular pattern eliminates sharp corners that concentrate stress during bending, thereby preventing detachment of the electroluminescence and encapsulation layers while maintaining ease of manufacture through standard photolithography processes.
2Manufacturing precision
If sub-pixel pattern has sharp corners, then definition is clearer, but stress concentration leads to electroluminescence layer detachment
Solution Approach 1:
The circular sub-pixel pattern replaces sharp corners with curved edges, distributing mechanical stress uniformly during bending operations. This curvature eliminates stress concentration points while maintaining clear visual definition of sub-pixel boundaries through precise photolithography patterning.
3Volume of moving object
If fold radius is small, then device is more compact, but bending stress increases causing sub-pixel damage
Solution Approach 1:
The circular sub-pixel geometry is inherently more resistant to bending stresses compared to square patterns. The curved edges distribute mechanical strain uniformly, enabling the display to withstand smaller fold radii without causing layer detachment or sub-pixel damage, thus achieving compact folded form factor.
Solution Approach 2:
The patent changes the geometric parameter of sub-pixel shape from square to circular, which fundamentally alters the stress distribution characteristics during bending. This parameter change enables the structure to tolerate higher bending stresses associated with smaller fold radii.
Data Source
AI summary
A foldable display panel is provided. The foldable display panel includes a foldable area and two non-foldable areas. The foldable display panel further includes at least two pixel units. Each of the pixel units includes three sub-pixels. A pattern of the sub-pixel in the foldable area is elliptical or is curved quadrilateral. A pattern of the sub-pixel in the non-foldable area is a rhombus. An ability of the sub-pixels located in the foldable area 100 to withstand stress during a bending process is enhanced. Detachment of an electroluminescent layer or a thin film encapsulation layer located in the foldable area is prevented, thereby a reliability of a display device is ensured and a quality of the product is improved.