Flexible Display Panel Stress Neutral Layer Touch Electrode Integration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Flexible display devices with integrated touch panels are prone to damage due to repeated bending, as the touch layer is often far from the stress neutral layer, making it susceptible to disconnection and breakage under significant bending forces.
Innovation Solution
The flexible display panel design incorporates a stress neutral layer with first and second touch electrode lines that intersect and are electrically connected by bridging lines, which are integrated closer to the stress neutral layer, reducing stress and deformation, and includes display driving lines and light emitting diodes in the same layer to enhance durability and reduce thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the touch panel is integrated on the flexible display device, then the function of the flexible display device is expanded, but the touch panel is easily broken or damaged due to multiple times of bending
Solution Approach 1:
The patent moves the touch electrode lines from the outer surface of the flexible display panel to the stress neutral layer (middle layer), changing their spatial position from the surface dimension to the internal cross-sectional dimension. This dimensional relocation places the touch electrodes in the region where bending stress is minimal, thereby protecting them from damage while maintaining the integrated touch display function
Solution Approach 2:
The patent introduces a stress neutral layer as an intermediary position for the touch electrode lines. This middle layer acts as a mediator between the flexible substrate and the outer surface, providing a location that experiences minimal stress during bending while still allowing the touch panel to function on the flexible display device
2Ease of operation
If the touch layer is far from the stress neutral layer, then the touch panel can be positioned on the outer surface for easy access, but it is susceptible to disconnection and breakage under significant bending forces
Solution Approach 1:
The patent relocates the touch electrode lines from the outer surface dimension to the internal stress neutral layer dimension. This spatial repositioning in the thickness direction of the panel allows the touch functionality to be accessed from the outer surface while the actual electrode lines reside in the protected middle layer, resolving the conflict between accessibility and stress resistance
3Reliability
If multiple layers are used for touch electrode lines and display driving lines, then the functions are separated for better performance, but the overall thickness of the flexible display panel increases
Solution Approach 1:
The patent merges the touch electrode lines and display driving lines into the same layer (the stress neutral layer). By combining these two functional elements in one layer rather than using separate layers, the patent maintains distinct signal transmission paths for touch and display functions while reducing the overall thickness of the flexible display panel
Data Source
AI summary
The present disclosure provides a flexible display panel, which includes: a flexible substrate; and a first pattern layer and a second pattern layer on the flexible substrate, which are spaced apart from each other in a thickness direction of the flexible display panel. The first pattern layer is a stress neutral layer of the flexible display panel. The first pattern layer includes a plurality of first touch electrode lines and a plurality of second touch electrode lines in a same layer, the first touch electrode lines are arranged to intersect with the second touch electrode lines, the second touch electrode lines are disconnected at intersections with the first touch electrode lines, the second pattern layer includes a plurality of bridging lines, and the bridging lines are arranged to electrically connect parts of the second touch electrode lines disconnected at the intersections.