Bending Display Panel Conductive Line Stress Mitigation
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Solution Overview
Problem
Display devices with bending portions are prone to cracks due to vertical stress on electrically conductive lines, compromising their reliability.
Innovation Solution
A display device design featuring a display panel with a bending and non-bending portion, where electrically conductive lines have extensions that overlap non-display areas, and an optical plate with varying thickness and coverage to mitigate stress, including a retardation film only in the display area and a pressure-sensitive adhesive layer for enhanced flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display device includes a bending portion, then the display device can be flexed or folded, but vertical stress occurs on the electrically conductive lines causing cracks
Solution Approach 1:
The electrically conductive lines are segmented into multiple portions: a first portion in the non-bending area, a second portion in the bending area, and a third portion extending into the non-display area. This segmentation allows each portion to be optimized for its specific function, with the third portion acting as a stress-relief extension that reduces crack formation during bending
Solution Approach 2:
The electrically conductive lines extend from the display area into the non-display area, utilizing the third dimension (depth/thickness direction) to create an overlapping structure. This dimensional extension allows the lines to be positioned strategically to reduce stress concentration in the bending portion while maintaining electrical connectivity
2Reliability
If the optical plate covers the entire display panel including non-display area, then stress is distributed evenly, but manufacturing complexity increases
Solution Approach 1:
The optical plate is designed with different portions having different functions: a first optical plate portion covering the display area and a second optical plate portion extending to cover the third portion of the electrically conductive lines in the non-display area. This local differentiation allows the optical plate to provide stress distribution where needed while simplifying manufacturing in other areas
Data Source
AI summary
A display device comprises a display panel and an optical plate. The display panel comprises a surface comprising a display area and a non-display area, the display panel further comprising a bending portion that is bent and a non-bending portion that is not bent. The display panel comprises: a base substrate, an array of pixels formed over the base substrate, and electrically conductive lines disposed over the base substrate and electrically connecting the array of pixels to an exterior device, the electrically conductive lines comprising at least one extension formed in the bending portion and overlapping the non-display area when viewed in a thickness direction of the display panel. The optical plate is disposed over the display panel, and comprises: a first optical plate portion covering the display area, and a second optical plate portion covering the at least one extension of the electrically conductive lines.