Touch Panel Guard-Ring Layers for ESD Without Frame Widening
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Solution Overview
Problem
Electrostatic discharge (ESD) poses a significant threat to electrostatic capacitance type touch panels, leading to circuit destruction and malfunctions, and existing solutions to mitigate ESD often require widening the frame of the touch panel by incorporating guard rings.
Innovation Solution
A touch panel design where conductive layers on the cover substrate act as a guard ring, positioned along the periphery of sensor electrodes and signal wirings, without occupying additional space, thereby preventing ESD without enlarging the frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a guard ring is provided within the same layer as the sensor electrode to prevent ESD, then ESD protection is improved, but the frame of the touch panel is widened
Solution Approach 1:
The patent moves the guard ring from the sensor electrode layer to the cover substrate layer, utilizing the vertical dimension (layer stacking) rather than expanding the horizontal footprint. This allows ESD protection functionality to be added without increasing the in-plane frame width, as the guard ring now resides in a different spatial dimension (upper layer vs. lower layer).
Solution Approach 2:
The patent segments the touch panel structure into distinct functional layers: the sensor electrode layer for touch detection and the cover substrate layer for ESD protection. By separating these functions into different layers, the guard ring can be positioned in the cover substrate layer without interfering with the sensor electrode layout, thus preventing frame widening while maintaining ESD protection.
2Reliability
If the frame of the touch panel is widened to accommodate a guard ring, then ESD protection is improved, but the display area is reduced
Solution Approach 1:
The patent utilizes the vertical dimension by placing the guard ring in the cover substrate layer above the sensor electrode layer. This dimensional separation allows the guard ring to be incorporated without increasing the in-plane frame width, thereby preserving the full display area while providing ESD protection.
Solution Approach 2:
The patent merges the guard ring functionality with the existing cover substrate structure. Instead of adding a separate guard ring component that would increase the frame width, the guard ring is integrated into the cover substrate layer, combining structural support and ESD protection functions into a single layer, thus maintaining the display area.
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 design effectively mitigates ESD without enlarging the touch panel frame, ensuring reliable operation while maintaining panel dimensions.
Implementation Method 1
circuit destruction and a malfunction due to Electro-Static Discharge (ESD) become serious problems
Implementation Method 2
an electrostatic capacitance type touch panel... is adapted to detect a change in an electrostatic capacitance in a position on a detection surface where the detection surface is touched
Data Source
AI summary
Disclosed herein is a touch panel including: a sensor substrate and a cover substrate stuck to each other. The sensor substrate includes a sensor electrode, and plural signal wirings electrically connected to the sensor electrode and extending along a periphery of the sensor electrode. The cover substrate includes one or plural conductive layers extending along the periphery of the sensor electrode and the plural signal wirings within an area not facing the sensor electrode and the plural signal wirings.