Bend Area Wiring Line Geometry for Display Stress Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices, such as those in cellular telephones and PDAs, face issues with wiring line disconnection due to stress caused by bending, particularly in the bend areas where mounting substrates are located, leading to performance and design challenges.
Innovation Solution
The implementation of a wiring line structure in the bend area with specific geometric configurations, including units that extend in directions intersecting the bend direction, and the use of an inorganic insulating layer to distribute stress and prevent disconnection, while reducing resistance by increasing the substantive thickness of the wiring line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the display panel is bent to locate the mounting portion below the display surface to narrow the frame, then the frame width is reduced and design is improved, but the wiring line may be disconnected due to stress caused by bending
Solution Approach 1:
The wiring line is divided into multiple segments (first wiring line and second wiring line) that are arranged in different directions. The first wiring line extends in the first direction while the second wiring line extends in the second direction, creating a grid-like structure that distributes bending stress across multiple orientations rather than concentrating it in a single direction.
Solution Approach 2:
The wiring lines are configured with different orientations and positions to provide localized stress resistance. The first wiring line and second wiring line intersect to create regions with different mechanical properties, allowing the wiring structure to adapt to localized stress patterns caused by bending.
2Reliability
If the wiring line is configured to extend in directions intersecting the bend direction to prevent disconnection, then reliability is improved, but the resistance of the wiring line increases
Solution Approach 1:
Multiple wiring lines (first and second wiring lines) are combined to form a unified conductive network. By merging these parallel conductive paths, the overall resistance is reduced while maintaining the multi-directional stress distribution that prevents disconnection.
Solution Approach 2:
The wiring structure functions as a composite conductive system where multiple wiring lines with different orientations work together. This composite approach allows the system to simultaneously achieve mechanical reliability through multi-directional stress distribution and electrical efficiency through parallel conductive paths.
Data Source
AI summary
According to one embodiment, there is provided a display device which includes an insulating substrate having a bend area, and a wiring line located in the bend area. The bend area is bent about a bend axis extending in a first direction. The wiring line in the bend area has a first portion which extends in the first direction and a second portion which extends in a direction intersecting the first portion and is connected to the first portion. A first angle formed by the first portion and the second portion is less than 90 degrees.