Touch Sensing Layer Layout for Crossing-Line Short-Circuit Isolation
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Solution Overview
Problem
The likelihood of short-circuits between sensing lines crossing each other in a plan view is increased due to the various shapes of display areas in display devices, which can lead to operational failures.
Innovation Solution
A sensing unit design with a first conductive layer including auxiliary sensing lines and connection lines that overlap and connect sensing patterns through contact holes, ensuring electrical isolation and preventing short-circuits by non-overlapping configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sensing lines are arranged to cover various display area shapes, then the sensing unit can adapt to different display configurations, but the likelihood of short-circuits between crossing sensing lines increases
Solution Approach 1:
The patent transitions from a single-layer sensing line arrangement to a multi-layer configuration where sensing lines are distributed across different vertical levels. The first sensing lines are arranged in a first area, while second sensing lines are arranged in a second area at a different vertical position, allowing crossing connections without planar intersection and eliminating short-circuit risks.
Solution Approach 2:
The sensing line network is segmented into multiple independent layers, with each layer containing specific sensing lines that perform particular routing functions. This segmentation allows each layer to be optimized independently for its specific routing needs while avoiding conflicts with other routing paths on different layers.
2Area of stationary object
If sensing lines cross each other in plan view to accommodate display shape requirements, then coverage is improved, but electrical isolation becomes difficult to maintain
Solution Approach 1:
The patent resolves the electrical isolation problem by utilizing the vertical dimension. Second sensing lines are positioned at a different vertical level than first sensing lines, allowing them to cross in plan view while maintaining physical separation through the insulating layer, thus preserving electrical isolation while achieving comprehensive area coverage.
3Measurement precision
If multiple sensing lines are arranged densely to improve sensing resolution, then measurement precision increases, but the complexity of preventing short-circuits increases
Solution Approach 1:
The patent reduces the complexity of preventing short-circuits in dense sensing line arrangements by distributing lines across multiple vertical layers. This spatial separation simplifies the isolation strategy, as lines on different layers are naturally separated by insulating materials, allowing dense packing within each layer without increasing inter-line short-circuit risk.
Data Source
AI summary
A sensing unit including a first conductive layer including a first line portion including a first auxiliary sensing line, a second auxiliary sensing line, and a connection line, an insulating layer and a second conductive layer disposed on the insulating layer. The second conductive layer includes an electrode portion including a first sensing pattern and a second sensing pattern and a second line portion including a first sensing line overlapping the first auxiliary sensing line and connected to the first sensing pattern and a second sensing line overlapping the second auxiliary sensing line. The first sensing line is disposed between the second sensing pattern and the second sensing line, the connection line does not overlap the first auxiliary sensing line, crosses the first sensing line in a plan view, and connects the second sensing line to the second sensing pattern through contact holes defined through the insulating layer.