Touch Panel Ground Electrode Width via Layered Insulation
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Solution Overview
Problem
Existing touch panels face challenges in effectively disposing a ground electrode while maintaining a constant bezel area, as the width of the ground electrode is limited by the width of the wire electrode, affecting ESD shielding and touch sensitivity.
Innovation Solution
The touch panel design involves forming the ground and wire electrodes at mutually different locations, with the insulating layer covering one of them, allowing the ground electrode to be widened without regard to the wire electrode's width, and simultaneously forming the insulating layer with the sensing and bridge electrodes using the same material, thereby enhancing ESD shielding and process efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ground electrode is formed on the printing layer with the wire electrode, then the ESD shielding is improved, but the width of the ground electrode is limited by the width of the wire electrode
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement where both electrodes share the same layer to a three-dimensional stacked arrangement. The ground electrode is positioned on the printing layer while the wire electrode is placed on an insulating layer above it, allowing both electrodes to coexist without spatial conflict and enabling the ground electrode to achieve its full required width.
Solution Approach 2:
The patent separates the ground electrode and wire electrode into different spatial layers. The ground electrode resides on the printing layer while the wire electrode is positioned on an insulating layer above, effectively segmenting their spatial occupation and eliminating the width constraint imposed by their previous co-planar arrangement.
2Reliability
If the width of the ground electrode is widened to improve ESD shielding, then the ESD shielding efficiency is improved, but the unactive area is enlarged so that left and right bezels are widened
Solution Approach 1:
By moving the wire electrode to a higher layer (on the insulating layer above the printing layer), the patent creates vertical separation that allows the ground electrode to extend fully across the unactive area without conflict. This dimensional reorganization enables maximum ground electrode width within the existing unactive area boundaries without requiring bezel expansion.
3Ease of manufacture
If the ground electrode and wire electrode are formed at the same location on the printing layer, then the process is simplified, but the width of the ground electrode is constrained
Solution Approach 1:
The patent segments the electrode formation process into distinct layers: the ground electrode is formed on the printing layer while the wire electrode is formed on an insulating layer above it. This spatial segmentation maintains manufacturing simplicity through sequential layer formation while eliminating the width constraint that would result from co-planar arrangement.
Solution Approach 2:
The patent resolves the manufacturing complexity by adding a vertical dimension to the electrode arrangement. Instead of complicating the planar process, the solution introduces an insulating layer above the printing layer, allowing both electrodes to be formed using standard sequential deposition processes while achieving the required ground electrode width.
Data Source
AI summary
A touch panel includes a cover substrate including an active area and an unactive area; a printing layer on the unactive area; a conductive layer on the printing layer; an insulating layer on the printing layer; and a wire electrode insulated from the conductive layer by the insulating layer.