Sensing Unit Dummy Wire Cut Part Coupling Capacitance
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Solution Overview
Problem
Sensing units with irregularly shaped active areas face challenges in reliability due to the need for various wire designs, which can lead to sensitivity degradation and misrecognition of touch inputs.
Innovation Solution
A sensing unit design incorporating a base layer with multiple sensing patterns, sensing wires, connecting wires, dummy wires with cut parts, and connecting parts that overlap or are spaced apart to reduce coupling capacitance and enhance reliability, thereby improving touch sensing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If various wire designs are used for irregularly shaped active areas, then the sensing unit can sense touch inputs across different shapes and areas, but the reliability deteriorates due to sensitivity degradation and misrecognition of touch inputs
Solution Approach 1:
A dummy wire is introduced as an intermediary element between the connecting wire and the sensing patterns. The dummy wire acts as a mediator to block or reduce the harmful coupling capacitance effect that causes misrecognition, while not interfering with the normal sensing function. This intermediary structure allows the system to maintain adaptability for irregular shapes while improving reliability by eliminating the harmful electromagnetic coupling.
2Productivity
If connecting wires are used to connect sensing patterns, then the sensing unit can function across different areas, but coupling capacitance is generated that causes misrecognition of touch inputs
Solution Approach 1:
The dummy wire serves as an intermediary barrier between the connecting wire and the sensing patterns. It physically interrupts the electromagnetic field coupling path without blocking the electrical connection function. The dummy wire is designed to overlap with the connecting wire in specific regions, creating a shielding effect that reduces coupling capacitance while maintaining the connectivity needed for extended sensing coverage.
Solution Approach 2:
The harmful coupling capacitance effect is extracted or removed from the system by introducing the dummy wire structure. The dummy wire effectively 'takes out' the problematic electromagnetic coupling by providing an alternative field path or shielding the sensitive sensing patterns from the connecting wire's electromagnetic field, thereby eliminating the source of misrecognition.
3Reliability
If dummy wires are disposed around connecting wires, then coupling capacitance can be reduced, but the device complexity increases
Solution Approach 1:
The dummy wire is merged with the existing wire structure in terms of material composition and layer integration. Both the dummy wire and connecting wire are formed using the same conductive material and deposition processes, and they are integrated into the same structural layer. This merging approach reduces device complexity by using uniform manufacturing processes and materials, while still achieving the reliability improvement through the strategic placement of the dummy wire structure.
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
The design enhances the reliability of sensing units by minimizing the impact of coupling capacitance and preventing misrecognition of touch inputs, ensuring improved sensitivity and accuracy in sensing irregularly shaped active areas.
Implementation Method 1
a dummy wire which is disposed around an area on which the connecting wire is disposed and in which a cut part is defined in an area adjacent to an area in which the connecting part crosses the connecting wire
Data Source
AI summary
A sensing unit includes a base layer, a sensing pattern part including a first sensing pattern, a second sensing pattern, and a third sensing pattern, which are each disposed on the base layer, a sensing wire disposed on the base layer and electrically connected to the first sensing pattern, a connecting wire connecting the second sensing pattern to the third sensing pattern, a dummy wire disposed around an area on which the connecting wire is disposed, and a connecting part connecting the first sensing pattern to the sensing wire and overlapping the connecting wire on a plane. Here, a cut part is defined in the dummy wire.