Touch Panel Extended Sensing Lines Reduce Dead Zones
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Solution Overview
Problem
Conventional single-layer touch panels with indium tin oxide (ITO) have higher impedance, resulting in wider touch-controlling lines that occupy more space, reducing the effective touch-detecting area and increasing dead zones where touches cannot be detected.
Innovation Solution
The touch panel design includes extended sensing lines that form mutual capacitances in the touch-detecting area, with direction touch-controlling lines installed between the extended sensing and touch-controlling lines, effectively reducing dead areas and improving touch positioning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch-controlling lines are made wider to reduce impedance, then electrical conductivity is improved, but the area occupied by touch-controlling lines increases, reducing the effective touch-detecting area
Solution Approach 1:
The sensing lines are extended from the sensing area into the touch-detecting area, utilizing the spatial dimension to create additional mutual capacitance regions. This allows the system to detect touches in previously dead zones without requiring wider touch-controlling lines, thus resolving the contradiction between conductivity and detectable area.
Solution Approach 2:
The sensing lines are divided into segments, with portions extending into the touch-detecting area to form separate mutual capacitance regions. This segmentation allows independent optimization of line width for conductivity while creating additional detection zones that expand the effective touch area.
2Device complexity
If all sensing lines are positioned between two touch-controlling lines, then the structure is simplified, but dead areas increase where touches cannot be detected
Solution Approach 1:
Sensing lines extend beyond their traditional boundaries into the touch-detecting area, utilizing unused spatial regions to create additional mutual capacitance. This transforms previously dead areas into active detection zones without adding complex structural elements.
Solution Approach 2:
The sensing lines serve dual functions: maintaining their original position between touch-controlling lines for basic capacitance formation, and extending into the touch-detecting area to create additional mutual capacitance regions, thereby eliminating dead zones while preserving structural simplicity.
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 decreases the dead areas and enhances touch positioning accuracy by utilizing mutual capacitances in the touch-detecting area, allowing for a more effective and accurate detection of touch gestures.
Implementation Method 1
The plurality of touch-controlling lines being extended to the sensing area to form mutual capacitances. The sensing line stretches into the touch-detecting area as an extended sensing line, forming a mutual capacitance in the touch-detecting area
Data Source
AI summary
A touch panel includes a plurality of sensing lines disposed in a sensing area, a plurality of touch-controlling lines disposed in a touch-detecting area, and an extended sensing line. The plurality of sensing lines are used for generating sensing signals, and the plurality of touch-controlling lines are used for receiving touch-controlling signals. The plurality of touch-controlling lines are extended to the sensing area to form mutual capacitances. The sensing line stretches into the touch-detecting area as the extended sensing line, forming a mutual capacitance in the touch-detecting area. It decreases the dead areas effectively and makes the positioning of touches more accurate.