Curved Protective Layer Border for Display Panel Stress Relief
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Solution Overview
Problem
Touch display panels face issues with stress concentration and conductive pin breakage during bonding and bending, leading to failure of the sensing touch function, especially under temperature shock conditions, due to the regular shape of the opening in the protective layer.
Innovation Solution
A display panel design with a protective layer having a curved border proximate to the display area, which disperses stress and reduces the risk of conductive pin breakage, featuring a combination of curved and straight sub-borders to evenly distribute stress and prevent pin damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a regular-shaped opening is used in the protective layer, then the manufacturing process is simple, but stress concentrates on conductive pins causing breakage
Solution Approach 1:
The patent applies curvature to the border of the opening in the protective layer, replacing straight lines with curved segments. This curvature design allows stress to be dispersed along the curved path rather than concentrating at sharp corners, thereby preventing conductive pin breakage while maintaining manufacturing feasibility through standard photolithography processes.
2Length of moving object
If the opening border is extended in the conductive pin arrangement direction, then the narrow bezel design is achieved, but stress concentration increases
Solution Approach 1:
The patent extends the opening border in the conductive pin arrangement direction to achieve narrow bezel design, but incorporates curved segments at critical positions. These curved segments serve as stress-relief features that prevent stress concentration even as the overall border length increases, enabling both narrow bezel and pin reliability.
3Device complexity
If straight-line borders are used in the opening, then the structure is simple, but stress is not effectively dispersed
Solution Approach 1:
The patent replaces straight-line borders with curved segments in the opening structure. This curvature transformation fundamentally changes the stress distribution pattern, allowing stress to follow the curved path and be dispersed more effectively. The added geometric complexity is minimal and can be achieved through standard manufacturing processes.
Data Source
AI summary
A display panel has a display area and a frame area located on a side of the display area, and the frame area includes a bonding region. The display panel includes: a display substrate, a touch structure disposed on the display substrate, and a protective layer disposed on a side of the touch structure away from the display substrate. The touch structure includes a plurality of conductive pins located in the bonding region. The protective layer has an opening, the opening is located in the bonding region and serves to expose the plurality of conductive pins. The opening includes a border proximate to the display area and extending in a direction in which the plurality of conductive pins are arranged, and at least portion of the border has a curved shape.