Display Bending-Region Slits for Crack-Resistant Relay Wiring
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Solution Overview
Problem
Lead-out wiring lines in display devices can disconnect when cracks form in the bending region during size adjustment, leading to potential disconnection issues.
Innovation Solution
The display device incorporates a bending region with a first resin layer and a second resin layer, featuring slits at the outer sides of relay wiring lines, to prevent disconnection by cracks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display device is cut to a desired size, then the device can be customized to fit specific applications, but cracks may be generated in the bending region causing wiring line disconnection
Solution Approach 1:
The resin layer is segmented by forming multiple slits that extend from the surface to the wiring line layer, creating separate regions that prevent crack propagation while maintaining structural integrity and electrical connectivity during cutting operations
Solution Approach 2:
The slits act as intermediary structures between the resin layer and wiring lines, serving as stress relief zones that prevent direct transmission of crack forces to the wiring lines, thereby maintaining connectivity despite cutting-induced stress
2Reliability
If relay wiring lines are provided in the bending region, then electrical connection between display region and terminal is achieved, but the wiring lines become vulnerable to disconnection when cracks occur
Solution Approach 1:
The slits, which appear to be weaknesses in the resin layer, are actually designed to convert harmful crack propagation into beneficial stress distribution patterns that protect the wiring lines. The slits create controlled separation zones that prevent uncontrolled crack growth toward the wiring lines
Solution Approach 2:
The slits are formed in advance during manufacturing, creating pre-stress relief structures before the device undergoes cutting or bending operations. This preliminary action ensures that when cracks do form, they are directed away from the wiring lines through the pre-formed slit structures
Data Source
AI summary
A display device includes a display region of an image, a terminal region provided with a plurality of terminals, and a bending region being a region between the display region and the terminal region and being bendable, the bending region includes a first resin layer, a plurality of relay wiring lines provided on the first resin layer and provided between the display region and the terminal region, and a second resin layer provided on the first resin layer and covering the plurality of relay wiring lines, and the first resin layer and the second resin layer in the bending region are provided with a plurality of slits having a depth from a surface of the second resin layer to the first resin layer at outer sides than the relay wiring lines provided at both ends among the plurality of relay wiring lines in a plan view.