Display Module Curved Corner Bonding for Reduced Wrinkling
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Solution Overview
Problem
Curved surface areas in four curved display panels are prone to wrinkling, especially in corner areas, which affects the appearance and functionality of display devices.
Innovation Solution
A display module design with a cover plate featuring a bonding surface that includes a first plane and a first curved surface, where the corner curved surface has a greater mean radius of curvature away from adjacent side curved surfaces, reducing compression and wrinkling probability by gradually increasing curvature towards the center of the corner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the corner curved surface has a small mean radius of curvature, then the bonding area is maximized and the frame is narrowed, but the display panel is prone to wrinkling during bonding
Solution Approach 1:
The patent applies local quality by differentiating the mean radius of curvature at different locations of the corner curved surface. The area close to side curved surfaces has a smaller mean radius of curvature to maximize bonding area, while the area away from side curved surfaces has a larger mean radius of curvature to prevent wrinkling. This spatial variation in curvature radius optimizes both bonding effectiveness and defect prevention in different local regions.
Solution Approach 2:
The patent changes the geometric parameter (mean radius of curvature) of the corner curved surface to resolve the contradiction. By setting different mean radius of curvature values in different areas of the corner curved surface, the patent achieves both a large overall bonding area and reduced wrinkling probability, transforming a single-parameter design into a multi-parameter optimized solution.
2Manufacturing precision
If the corner curved surface has a large mean radius of curvature, then the wrinkling probability is reduced, but the bonding area decreases and the frame width increases
Solution Approach 1:
The patent resolves this contradiction by applying different curvature radii to different local areas of the corner curved surface. The region close to side curved surfaces maintains a smaller mean radius of curvature to preserve bonding area, while the region away from side curved surfaces adopts a larger mean radius of curvature to reduce wrinkling, achieving local optimization throughout the corner structure.
Solution Approach 2:
The patent utilizes parameter changes by varying the mean radius of curvature across the corner curved surface area. This spatial variation allows the structure to simultaneously achieve adequate bonding area in certain regions and reduced wrinkling probability in other regions, overcoming the limitation of a uniform curvature radius design.
3Ease of manufacture
If the corner curved surface has a sudden change in topography, then the manufacturing process is simplified, but optical abnormalities occur in the display panel
Solution Approach 1:
The patent addresses this contradiction by implementing local quality control through gradual topography changes in the corner curved surface. The transition between different curvature regions is designed to be progressive rather than abrupt, which maintains manufacturing feasibility while preventing optical abnormalities caused by sudden topography changes in the display panel.
Solution Approach 2:
The patent applies the dynamics principle by creating a gradual, progressive change in the topography of the corner curved surface. Instead of a static, abrupt transition, the design incorporates a dynamic gradient in curvature radius that transitions smoothly from one region to another, thereby avoiding optical disturbances while remaining manufacturable.
Data Source
AI summary
The present disclosure provides a display module and a display device. A side of the cover plate close to the display panel is provided with a bonding surface. The bonding surface includes a first plane and a first curved surface connected to a periphery of the first plane. A side of the first curved surface close to the first plane is provided with a bonding arc area. In the bonding arc area, a mean radius of curvature in an area where a corner curved surface is away from side curved surfaces connected thereof is greater than a mean radius of curvature of an area where the corner curved surface is close to the side curved surfaces connected thereof.