Foldable Display Touch Lead Wire Layout for Anti-Fracture Bending
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Solution Overview
Problem
The touch lead wire in foldable display devices is prone to fracture during the folding process due to concentrated stress when the edges of the lead wires are directly opposite each other.
Innovation Solution
The design of the foldable display panel includes a first touch lead wire and a second touch lead wire that are arranged in a stacked manner, with the second touch lead wire having a greater thickness than the first, ensuring that their edges are not directly opposite each other during folding, distributing stress uniformly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the touch lead wire is arranged in the border area, then the display device achieves large screen and wide field of view, but the touch lead wire is prone to fracture during folding
Solution Approach 1:
The touch lead wire structure is segmented into multiple layers (first touch lead wire and second touch lead wire) with different thicknesses. The first touch lead wire has smaller cross-sectional area while the second touch lead wire has larger cross-sectional area, dividing the stress-bearing function across multiple segments with different properties.
Solution Approach 2:
Different parts of the touch lead wire structure have different local qualities - the first touch lead wire has smaller cross-sectional area for flexibility, while the second touch lead wire has larger cross-sectional area for strength. This local differentiation allows the structure to simultaneously achieve flexibility for folding and strength for reliability.
2Device complexity
If the edges of the first and second touch lead wires are directly opposite each other, then the structure is compact, but stress is concentrated causing fracture
Solution Approach 1:
The second touch lead wire is designed with asymmetric thickness distribution relative to the first touch lead wire. The cross-sectional area of the second touch lead wire is intentionally made larger than that of the first touch lead wire, creating an asymmetric structure that prevents direct edge-to-edge alignment and distributes stress more evenly.
Solution Approach 2:
The thicker second touch lead wire acts as a cushioning layer that absorbs and distributes stress before it reaches the thinner first touch lead wire. This beforehand cushioning prevents stress concentration at the edges of the first touch lead wire, reducing the risk of fracture during folding operations.
Data Source
AI summary
The present application relates to a foldable display panel and a foldable display device. The foldable display panel has a bending area and includes a display substrate, and a touch lead wire is arranged on one side of the display substrate and includes a first touch lead wire and a second touch lead wire, and the second touch lead wire is located on a side of the first touch lead wire away from the display substrate. A thickness of the second touch lead wire along a thickness direction of the display substrate is greater than a thickness of the first touch lead wire along the thickness direction of the display substrate. In at least part of the bending area, an orthographic projection of the first touch lead wire on the display substrate is located within an orthographic projection of the second touch lead wire on the display substrate.