Flexible Display Wiring with Recessed Segments for Stress Distribution
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Solution Overview
Problem
Flexible display apparatuses face challenges in achieving high mechanical durability without compromising their flexibility, as stress concentration at bending areas can lead to damage, and increasing material stiffness to enhance durability reduces flexibility.
Innovation Solution
Incorporating a wiring line with recessed portions at the bending area, which are alternately arranged on both sides of the central axis, reducing the width and depth of these recessed portions to minimize resistance while maintaining flexibility and aperture ratio, and ensuring the wiring line is electrically connected to a sensor for external touch sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a relatively stiff or rigid material is used to increase the mechanical durability of the flexible display apparatus, then the mechanical durability is improved, but the flexibility of the flexible display apparatus is reduced or limited
Solution Approach 1:
The wiring line is segmented into multiple sections with recessed portions created at regular intervals along its length. This segmentation allows the wiring line to flex more easily at the recessed portions while maintaining structural integrity, resolving the contradiction between mechanical durability and flexibility by distributing stress across multiple segments rather than requiring the entire line to be either rigid or flexible.
Solution Approach 2:
The recessed portions are strategically positioned at bending areas where stress concentration occurs. By modifying the wiring line structure locally at these critical points while keeping other portions intact, the invention provides enhanced flexibility where needed without compromising the overall mechanical durability of the display apparatus.
2Reliability
If the wiring line is made wider to reduce resistance, then the resistance is decreased, but the aperture ratio is reduced and flexibility is compromised
Solution Approach 1:
The wiring line is divided into multiple segments separated by recessed portions. This segmentation allows each segment to be optimized independently - the segments can be sufficiently wide to maintain low resistance while the recessed portions between them prevent the wiring line from becoming a continuous wide structure that would reduce the aperture ratio.
Solution Approach 2:
Instead of increasing the width of the wiring line in two dimensions, the invention introduces a third dimension by creating recessed portions that extend into the wiring line. This vertical modification allows the wiring line to maintain its functional width for electrical conductivity while reducing its overall projected area, thereby maintaining aperture ratio.
3Adaptability or versatility
If recessed portions are created in the wiring line to maintain flexibility and aperture ratio, then the aperture ratio is maintained and flexibility is improved, but the resistance may increase
Solution Approach 1:
The recessed portions are designed to be partial rather than complete - they extend into the wiring line but do not completely sever it. This partial action provides sufficient flexibility and aperture ratio benefits while maintaining enough continuous conductive material to keep resistance increases minimal. The recessed portions are also spaced at optimized intervals to balance flexibility needs with electrical continuity.
Data Source
AI summary
A flexible display apparatus includes: a flexible substrate including a bending area and a non-bending area; and a wiring line extending across the bending area. The bending area is configured to bend along a bending axis, and a portion of the wiring line at the bending area includes a plurality of recessed portions recessed in a width direction of the wiring line.