Touch Panel Shielding Electrode Mitigates Mechanical Distortion
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Solution Overview
Problem
Capacitive touch panels suffer from mechanical distortion due to user pressure, leading to deviations in capacitance changes and reduced touch accuracy.
Innovation Solution
A touch panel design incorporating a transparent shielding electrode and a patterned compensation electrode, with a connection structure that electrically connects the shielding electrode to the compensation electrode, is used to mitigate mechanical distortion effects, enhancing accuracy by providing a superior shielding effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional capacitive touch panel is used, then the touch panel can detect capacitance changes for touch recognition, but mechanical distortion from user pressure causes deviation in capacitance change detection and reduces touch accuracy
Solution Approach 1:
A shielding electrode layer is introduced as an intermediary component between the sensor electrode and the external environment. This shielding layer acts as a mediator that blocks or reduces the influence of mechanical distortion from user pressure on the capacitance detection, thereby protecting the measurement precision without interfering with normal touch operation.
Solution Approach 2:
The electrode system is segmented into multiple functional layers: a sensor electrode for detecting touch signals and a separate shielding electrode for protecting against mechanical distortion. This segmentation allows each layer to perform its specific function independently, with the shielding electrode absorbing mechanical disturbances before they reach the sensor electrode, thus maintaining measurement accuracy.
2Measurement precision
If a shielding electrode is added to prevent mechanical distortion, then touch accuracy is improved, but the device structure becomes more complex
Solution Approach 1:
The shielding electrode layer serves multiple functions simultaneously: it shields the sensor electrode from mechanical distortion, provides electrical connection through connection structures, and can be integrated with existing pixel electrode patterns. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity while achieving improved touch accuracy.
Solution Approach 2:
The shielding electrode is merged with the pixel electrode pattern in certain regions, allowing the same structural element to serve both as a display component and as a shielding component. This merging reduces the number of discrete layers and simplifies the overall device structure while still providing the necessary shielding function for accurate touch detection.
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
The solution significantly improves touch accuracy by preventing mechanical distortion influences, ensuring precise touch recognition and reliability through effective shielding and adhesion between electrodes.
Implementation Method 1
a transparent shielding electrode... providing a superior shielding effect
Implementation Method 2
The connection structure is electrically connected to the transparent shielding electrode and the patterned compensation electrode
Data Source
AI summary
A touch panel includes a substrate, a transparent sensor electrode pattern, a patterned compensation electrode, a passivation layer, a transparent shielding electrode and at least one connection structure. The substrate has a surface and includes a sensor region and a peripheral region. The transparent sensor electrode pattern is disposed on the surface of the substrate and in the sensor region. The patterned compensation electrode is disposed on the surface of the substrate and in the peripheral region, and the patterned compensation electrode and the transparent sensor electrode pattern are electrically isolated. The passivation layer is disposed on the surface of the substrate, covers the transparent sensor electrode pattern, and at least partially exposes the patterned compensation electrode. The transparent shielding electrode is disposed on the passivation layer. The connection structure is electrically connected to the transparent shielding electrode and the patterned compensation electrode exposed by the passivation layer.