Bent Display Connection Wire Segmentation and Resin Buffering
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Solution Overview
Problem
The existing display devices experience cracking and breakage of connection wires at the bending section due to bending stress, leading to increased resistance.
Innovation Solution
A display device design that includes a slit in the bending section filled with a filling layer, with first and second connection wires composed of different metal films, covered by a resin film, and electrically connected via contact portions, preventing overlap and facilitating bending without cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the display device is bent to reduce frame region size, then the device size is reduced, but the connection wires at the bending section crack and break
Solution Approach 1:
The connection wires are divided into multiple segments (first connection wires and second connection wires) separated by the resin film. This segmentation allows each wire segment to independently accommodate bending stress without transferring crack propagation to adjacent segments, thereby maintaining wire integrity while enabling device bending.
Solution Approach 2:
A resin film is introduced as an intermediary layer between the first and second connection wires. This resin film acts as a stress buffer that absorbs and distributes bending forces, preventing direct stress transmission between wire layers and avoiding crack formation at the bending section.
2Device complexity
If connection wires are placed close together to reduce space, then device complexity is reduced, but bending stress causes cracking and increased resistance
Solution Approach 1:
The wire arrangement transitions from a two-dimensional planar layout to a three-dimensional stacked configuration with the resin film intermediary. This dimensional change allows wires to be positioned closer in the planar view while maintaining adequate stress separation through the vertical resin film layer, preventing cracking during bending.
3Ease of operation
If the bending section is made more flexible to facilitate bending, then ease of operation improves, but connection wires crack due to increased bending stress
Solution Approach 1:
The resin film is pre-positioned between the connection wires before bending occurs. This beforehand cushioning provides immediate stress protection to the wires during bending operations, absorbing mechanical energy and preventing crack initiation without requiring additional operational steps.
Data Source
AI summary
A second connection wire is electrically connected to a first connection wire via a display-side contact portion and terminal-side contact portion in a bending section. The first connection wire and the second connection wire do not overlap each other at least partly between the display-side contact portion and terminal-side contact portion.