Ring-Shaped Wiring for Flexible Display Bending Reliability
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Solution Overview
Problem
Existing display devices face challenges in maintaining high-resolution functionality while achieving a narrow bezel design, as bending substrates can lead to wiring cutoff issues, making it difficult to apply flexible and high-resolution displays effectively.
Innovation Solution
The implementation of a display device with dual wirings in the bending region, where a first wiring and a second wiring are arranged in a ring-shaped pattern with a central empty region to prevent complete cutoff, allowing for reduced wiring width and maintaining signal transmission even if cracks occur, and incorporating touch electrodes for high-resolution touch detection capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the substrate is bent to reduce bezel width, then the bezel width is reduced, but the wiring may be cut off
Solution Approach 1:
The wiring is divided into multiple segments arranged in a ring shape with spacing between them. This segmentation allows the wiring to flex during substrate bending without creating continuous stress that would cause cutoff, while still providing electrical connectivity through the distributed segments.
Solution Approach 2:
The wiring is arranged in a ring shape around a central empty region, transitioning from linear to circular geometry. This dimensional change allows the wiring to accommodate substrate bending by distributing stress around the ring rather than along a straight line, preventing cutoff while maintaining connectivity.
2Reliability
If the wiring width is widened to prevent cutoff, then wiring reliability is improved, but high-resolution application becomes difficult
Solution Approach 1:
The wiring is segmented into multiple discrete regions arranged in a ring, allowing each segment to be narrow while the collective ring structure provides redundancy. If one segment is compromised during bending, other segments maintain electrical connectivity, achieving reliability without requiring wide individual wiring.
Solution Approach 2:
The ring-shaped wiring concentrates conductive material where needed (in the ring segments) while leaving the central region empty. This local quality optimization allows narrow wiring segments to provide sufficient reliability through their distributed arrangement, without requiring overall wide wiring that would compromise resolution.
3Reliability
If dual wirings are implemented in ring shape, then wiring cutoff is prevented, but device complexity increases
Solution Approach 1:
The ring-shaped wiring structure serves multiple functions simultaneously: it provides electrical connectivity, accommodates substrate bending through its circular geometry, and prevents cutoff through distributed segmentation. This multi-functionality reduces the need for additional protective structures, offsetting the apparent complexity with functional consolidation.
Data Source
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AI summary
A display device includes: a display region formed in a first region on a substrate and including a plurality of pixels arranged therein; a touch electrode disposed on the display region and configured to sense a touch; and a non-display region disposed in a second region on the substrate. The non-display region includes a first pad portion, a second pad portion, a link portion, and a wiring portion in which a wiring is disposed so as to interconnect the first and second pad portions and the link portion. The wiring portion is disposed in a bending region where the substrate is bent, and the wiring includes a first wiring and a second wiring formed above the first wiring and having at least one point connected to the first wiring in the bending region.