Flexible Display Wiring Stress Dispersion via Bent Part Overlap
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Solution Overview
Problem
Flexible display devices face stress concentration issues when bent, leading to disconnection of wiring due to the intersection of straight selection and crank-shaped or S-shaped data lines, which compromises the reliability of the display.
Innovation Solution
Incorporating bent parts in both the first and second direction wiring, with one bent part overlapping the other at their intersection points, to disperse stress and prevent disconnection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If data lines are formed in crank shape or S shape to accommodate flexible bending, then the display device can be bent, but stress concentrates at wiring intersection points making disconnection more likely
Solution Approach 1:
The patent applies curvature to wiring designs by forming data lines in crank shapes or S shapes instead of straight lines. This allows the flexible display device to be bent while accommodating the mechanical deformation. The curved geometry distributes bending stress more evenly along the wiring path, preventing stress concentration that would occur with straight wirings during flexing operations.
Solution Approach 2:
The patent segments the wiring structure by introducing insulating layers between intersecting data lines and selection lines. The insulating layers act as separators that prevent direct contact between conductors at intersection points, eliminating the risk of short circuits while maintaining the flexibility of the curved wiring design. This segmentation allows each wiring layer to independently accommodate bending stresses.
2Device complexity
If straight selection lines and crank-shaped data lines intersect, then wiring layout is simplified, but stress concentration occurs at intersection points leading to disconnection
Solution Approach 1:
The patent introduces insulating layers as intermediary materials at wiring intersection points. These insulating layers mediate between the selection lines and data lines, preventing direct electrical contact while allowing the wirings to maintain their respective curved or straight geometries. This intermediary structure simplifies the overall wiring layout by allowing straightforward intersection patterns while simultaneously preventing stress-induced disconnection through proper insulation and stress distribution.
Data Source
AI summary
A display device includes a substrate having flexibility, a display region including a plurality of pixels above the substrate, a periphery region on an outer side of the display region above the substrate, a first wiring arranged in the periphery region and extending in a first direction, a first insulation layer above the first wiring, and a second wiring extending in a second direction intersecting the first direction above the first insulation layer, wherein the first wiring includes a first bent part, the second wiring includes a second bent part, and the first bent part overlaps the second wiring and the second bent part overlaps the first wiring in a region where the first wiring and the second wiring intersect.