Flexible Display Panel Groove Design for Stress Distribution
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Solution Overview
Problem
Conventional flexible display panels fracture due to non-uniform stress in the bending area, leading to breakage of metallic traces and resulting in dark lines or fringes during repeated bending.
Innovation Solution
A display panel design featuring a support plate with groove sets in the bending area, where the groove sets' area and density vary with distance from the bending center line, increasing hardness near the center line to reduce bending curvature and disperse stress uniformly, preventing panel fractures and metallic trace breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a metal sheet structure is disposed in the flexible display structure to guarantee bending performance and flatness, then the bending performance is improved, but the panel fractures at the bending center line due to non-uniform stress distribution
Solution Approach 1:
The support plate is designed with non-uniform groove distribution where the density and area of grooves vary at different positions. Specifically, the groove density is higher and groove area is larger at positions away from the bending center line, while groove density is lower and groove area is smaller near the bending center line. This local variation in structural properties creates non-uniform stress distribution that compensates for the inherent stress concentration at the bending center line, preventing panel fracture while maintaining bending performance.
2Ease of manufacture
If the bending area of the MST is uniformly patterned to reduce bending stress, then the manufacturing is simplified, but dark lines or dark fringes appear due to breakage of metallic traces
Solution Approach 1:
The support plate features position-dependent groove characteristics where groove density and area are adjusted according to location. Positions away from the bending center line have higher groove density and larger groove areas to reduce stress concentration, while positions near the bending center line have lower groove density and smaller groove areas. This localized structural optimization protects metallic traces from breakage without requiring complex non-uniform patterning processes, as the groove variation follows a systematic gradient.
Solution Approach 2:
The groove density and groove area parameters are systematically varied across the support plate surface. The groove density increases from the bending center line outward, and the groove area decreases from the edges toward the center line. This parameter gradient creates optimal stress distribution that prevents metallic trace breakage while maintaining manufacturing feasibility through controlled variation of geometric parameters.
Data Source
AI summary
A display panel and a display device are provided. The display panel includes a panel body and a support plate. A plurality of groove sets are provided on the support plate. Each groove set includes a plurality of grooves. An area of one of any two adjacent groove sets that is away from the bending center line is greater than an area of the other groove set close to a bending center line. An arrangement density of the grooves in the groove set away from the bending center line is greater than an arrangement density of the grooves in the other groove set close to the bending center line.