Flexible Display Neutral-Plane Wiring for Crack-Free Narrow Bezels
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Solution Overview
Problem
Conventional flexible display devices face issues with cracks in the bending area and limitations in high-resolution displays due to the design of the bezel and line patterns, which restrict the minimization of the bezel width and lead to aesthetic and functional drawbacks.
Innovation Solution
The flexible display device incorporates a substrate with a display area and a non-display area featuring a bending area where a link line and bending connection line are used, with buffer layers to form a neutral plane, allowing for bending without cracking and enabling a high-resolution, straight-line structure that minimizes bezel width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a conventional bezel bending design is used to minimize bezel width, then the aesthetic appearance is improved, but cracks occur in the source electrode and line patterns in the bending area
Solution Approach 1:
The patent applies different structural configurations to different areas: the bending connection line uses a meander pattern specifically in the bending area while using straight lines in non-bending areas. The buffer layers are strategically positioned only where needed to form a neutral plane in the bending region, creating local structural optimization that addresses cracking specifically where stress concentrates during bending.
Solution Approach 2:
The meander pattern of the bending connection line introduces curved paths instead of straight lines, allowing the electrical connection to accommodate bending deformation through its serpentine geometry. This curved configuration enables the line to flex without creating stress concentration points that would lead to cracking.
2Manufacturing precision
If straight line patterns are used for high-resolution displays, then manufacturing precision is improved, but the bezel width cannot be minimized due to cracking issues
Solution Approach 1:
The patent segments the line pattern into two distinct types: straight lines for general high-resolution display areas and meander patterns specifically for the bending area. This segmentation allows each region to have the optimal line configuration for its function, maintaining manufacturing precision where needed while enabling bezel minimization through the meander pattern's crack resistance.
3Reliability
If buffer layers are added to form a neutral plane in the bending area, then crack resistance is improved, but device complexity increases
Solution Approach 1:
The buffer layers are implemented only in the bending area where they are needed to form a neutral plane, rather than adding them uniformly across the entire display device. This localized approach provides crack resistance specifically where bending stress occurs while minimizing the overall increase in device complexity.
Data Source
AI summary
A flexible display device of which esthetic appearance is improved by reducing a bezel is disclosed. The flexible display device comprises a substrate including a display area and a non-display area including a bending area; a link line in the non-display area on the substrate; and a bending connection line in the bending area pf the substrate and connected with the link line, and the bending connection line located between a first buffer layer and a second buffer layer of the flexible display device.