Flexible Touch Display Panel Electrode Orientation and Shielding
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Solution Overview
Problem
Flexible display panels with integrated touch modules suffer from signal interference due to the close proximity of touch electrodes to the display units, affecting touch accuracy and making it difficult to achieve a slim, flexible design.
Innovation Solution
A flexible touch display panel design featuring a transparent conductive first touch electrode layer and a metal mesh second touch electrode layer, with an insulation layer in between, where the first touch electrodes are strip-shaped and extend perpendicular to the bending axis, and the second touch electrodes extend along the bending axis, enhancing bending resistance and shielding display signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the touch electrode is integrated in the display panel, then the flexible display panel becomes thinner, but the touch accuracy is affected due to signal interference from display signals
Solution Approach 1:
An insulation layer is introduced between the first touch electrode layer and the second touch electrode layer to block display signals from interfering with touch signals. This intermediary layer prevents harmful electromagnetic interference while maintaining the integrated slim structure of the flexible display panel.
Solution Approach 2:
The touch electrode system is divided into two separate layers: the first touch electrode layer integrated with the display panel and the second touch electrode layer positioned above it. This segmentation allows the touch function to be achieved while maintaining a compact structure, and when combined with the insulation layer, prevents signal interference.
2Reliability
If the first touch electrode layer is made as a transparent conductive layer, then signal interference from light emitting units is shielded, but the bending resistance may be reduced
Solution Approach 1:
The touch electrode system uses a composite structure combining transparent conductive material for the first touch electrode layer with metal mesh for the second touch electrode layer. The metal mesh provides enhanced mechanical strength and bending resistance while the transparent conductive layer maintains optical transparency and shields against display signals.
Solution Approach 2:
The metal mesh in the second touch electrode layer is designed with a curved or mesh pattern rather than straight lines, which improves its ability to withstand bending forces. The curved structure distributes stress more effectively during flexing of the flexible display panel.
3Stability of the object's composition
If the first touch electrodes are arranged perpendicular to the bending axis, then the transparent conductive layer is not affected by bending, but the device complexity increases
Solution Approach 1:
The first touch electrodes are designed with directional arrangement perpendicular to the bending axis, optimizing their orientation to match the expected deformation pattern during flexing. This local optimization ensures the electrodes remain functional and electrically connected during bending while maintaining a relatively simple overall structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration improves touch stability and accuracy by shielding display signals from the first touch electrodes and increasing bending resistance, allowing for a more flexible and stable touch display panel that maintains performance during folding and bending.
Implementation Method 1
an insulation layer disposed between the first touch electrode layer and the second touch electrode layer
Implementation Method 2
the first touch electrode layer is a transparent conductive layer, and the second touch electrode layer is metal mesh
Data Source
AI summary
A flexible touch display panel is provided. The touch display panel includes: a flexible substrate; a light emitting unit layer disposed on the flexible substrate, including a plurality of light emitting units; a first touch electrode layer; a second touch electrode layer; and an insulation layer disposed between the first touch electrode layer and the second touch electrode layer, the first touch electrode layer includes a plurality of first touch electrodes insulated from each other, the first touch electrodes are strip-shaped, extend along a bending axis of the display panel; the second touch electrode layer includes a plurality of second touch electrodes insulated from each other, the second touch electrodes are strip-shaped, extend along a direction perpendicular to the bending axis and are arranged along the bending axis. The first touch electrode layer is a transparent conductive layer, the second touch electrode layer is metal mesh.