Touch Sensing Panel Shield Pattern Capacitance Uniformity
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Solution Overview
Problem
Conventional touch sensing panels face challenges in maintaining a narrow peripheral area and achieving accurate contact information due to the presence of signal transfer wires, which create dead spaces and non-uniform capacitance, affecting the visibility of specific patterns and the accuracy of touch detection.
Innovation Solution
The design incorporates a shield pattern and dummy pattern between touch electrodes and signal transfer wires, ensuring uniform capacitance and reducing dead spaces by using connecting wires that transmit a constant voltage, and positioning these patterns to minimize visibility and enhance touch detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If signal transfer wires are provided in the dead space near the touch sensing area, then the touch sensing panel can transfer sensing signals, but the dead spaces become wider and the touch sensing area appears narrower
Solution Approach 1:
The signal transfer function is moved from the peripheral dead space to within the touch sensing area by using connecting wires that extend between adjacent touch electrodes. This dimensional repositioning allows signal transfer without sacrificing peripheral display area.
Solution Approach 2:
The signal transfer wires are merged with the touch electrode structure by positioning them between adjacent touch electrodes and coupling them to touch electrodes or connectors. This integration eliminates the need for separate peripheral signal transfer paths.
2Ease of manufacture
If signal transfer wires are placed in the peripheral area, then signal transfer is enabled, but dead spaces are created that reduce the effective display area
Solution Approach 1:
The signal transfer function is relocated from the peripheral dimension to the internal dimension of the touch sensing area, using connecting wires that operate between touch electrodes within the active display region.
3Ease of manufacture
If connecting wires are used between touch electrodes, then signal transfer is improved, but non-uniform capacitance is generated affecting touch detection accuracy
Solution Approach 1:
The connecting wire is configured with specific local characteristics - it is coupled to either a touch electrode or a connector, creating localized capacitance management at specific positions rather than uniform treatment throughout, which helps maintain overall capacitance uniformity.
4Ease of manufacture
If patterns are positioned in the touch sensing area, then connectivity is achieved, but density differences become visible affecting display quality
Solution Approach 1:
The connecting wire is strategically positioned and coupled to specific elements (touch electrodes or connectors) to achieve necessary connectivity while minimizing visual impact. The local placement optimizes both electrical function and visual uniformity.
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 configuration enlarges the touch sensing area, reduces visibility of pattern density differences, and improves the accuracy of contact information by maintaining uniform capacitance and minimizing operational errors in touch detection.
Implementation Method 1
configured to detect a change of capacitance of the sensing capacitor or a change of an amount of charge occurring when a conductor such as a finger approaches the touch detecting sensor
Implementation Method 2
a shield pattern adjacent to the first connecting wire and extending along the first connecting wire
Data Source
AI summary
A touch sensing panel includes a plurality of first touch electrodes and a plurality of second touch electrodes in a touch sensing area to sense a touch, the plurality of first touch electrodes and the plurality of second touch electrodes are separated from each other. The touch sensing panel further includes a plurality of first connectors coupling the first touch electrodes arranged in a first direction and a plurality of second connectors coupling the second touch electrodes arranged in a second direction different from the first direction, a first connecting wire between a second touch electrode of the second touch electrodes and a first touch electrode of the first touch electrodes that are adjacent to each other, the first connecting wire being coupled to the first touch electrode or the corresponding first connectors, and a shield pattern adjacent to the first connecting wire and extending along the first connecting wire.