Touch Electrode Layout to Eliminate Height Difference Resistance
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Solution Overview
Problem
The existing thin and light touch devices face precision issues due to the height difference between the sensing electrode layer on the peripheral area and the sensing area, causing resistance and impacting touch detection accuracy.
Innovation Solution
The formation order of the sensing electrode layer and shading layer is altered, with a conductive layer perforated through the shading layer to electrically connect the sensing electrode layer and signal transmission line layer, eliminating the height difference and floating resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the sensing electrode layer is formed on the peripheral area overlaying the black shading layer, then the touch device structure is simplified and the protective cover provides both protective and carrying functions, but the height difference between the sensing electrode layer on the peripheral area and sensing area causes resistance and impacts touch detection precision
Solution Approach 1:
The patent inverts the conventional formation sequence by first forming the black shading layer across the entire peripheral area, then forming the sensing electrode layer that extends from the sensing area through the peripheral area. This inversion allows the sensing electrode layer to be continuously formed without interruption, eliminating the height difference and resistance issues while maintaining the simplified structure where the protective cover carries the touch component.
2Reliability
If the sensing electrode layer is formed on the peripheral area to extend signals to the transmission line layer, then electrical connection is achieved, but the height difference creates floating resistance that degrades signal quality
Solution Approach 1:
The patent achieves equipotentiality by forming the sensing electrode layer continuously from the sensing area through the peripheral area at the same elevation, eliminating the height difference that caused floating resistance. The sensing electrode layer and signal transmission line layer are formed in the same plane, ensuring stable electrical connection and reliable signal transmission without resistance fluctuations.
Data Source
AI summary
The present disclosure relates to a touch technology, and more particularly to a touch device and a fabrication method thereof. The touch device comprises a sensing area and a peripheral area. The touch device further comprises a sensing electrode layer, a shading layer, a signal transmission line layer, and a conductive layer. The sensing electrode layer extends from the sensing area to the peripheral area. The shading layer is disposed on the peripheral area to overlay the sensing electrode layer and has a through hole to expose a portion of the sensing electrode layer. The signal transmission line layer is disposed on the shading layer and does not cover the through hole. The conductive layer fills the through hole and electrically connects the sensing electrode layer. In addition, a fabrication method of a touch device is also provided.