Touch Panel Raised Structure for Narrow Bezel Contact Impedance
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Solution Overview
Problem
Touch panels face challenges in achieving low contact impedance while maintaining the size requirements of narrow bezel products, as the overlapping area between touch electrodes and peripheral circuits affects the signal transmission and response rate.
Innovation Solution
A touch panel design featuring a raised structure between the substrate and the touch sensing electrode layer, which increases the overlapping area with the peripheral circuit layer, reducing contact impedance and improving electrical stability, allowing for a narrower border region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the overlapping area between touch sensing electrode layer and peripheral circuit layer is increased to reduce contact impedance, then the contact impedance decreases and signal transmission improves, but the lateral width of the border region increases, which conflicts with narrow bezel product requirements
Solution Approach 1:
The patent introduces a raised structure that adds vertical dimension (height) to the overlapping region between the touch sensing electrode layer and peripheral circuit layer. By increasing the vertical thickness of the overlapping area through the raised structure, the contact impedance is reduced without requiring an increase in the lateral width of the border region, thus resolving the contradiction between low contact impedance and narrow bezel requirements
2Length of stationary object
If the border region width is reduced to meet narrow bezel requirements, then the lateral space is saved, but the overlapping area between touch sensing electrode layer and peripheral circuit layer decreases, causing contact impedance to increase
Solution Approach 1:
The raised structure compensates for the reduced lateral overlapping area by increasing the vertical dimension of the overlap. The peripheral circuit layer is formed on the raised structure, creating a taller overlapping region that maintains adequate contact area and low contact impedance even when the border region lateral width is minimized
Data Source
AI summary
A touch panel includes a substrate, a raised structure, a touch sensing electrode layer, and a peripheral circuit layer. The substrate has a visible region and a border region surrounding the visible region. The raised structure is disposed on the substrate and located in the border region, in which the raised structure and the substrate constitute a step area. The touch sensing electrode layer is disposed in the visible region and partially extends to the border region to cross over the raised structure and cover the step area. The peripheral circuit layer is disposed in the border region, and overlaps the touch sensing electrode layer at least on the raised structure and the step area.