Floating Sub-Patterns in Input Sensing Circuits
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Solution Overview
Problem
Display devices face issues with short circuits due to insulating film defects in input sensing circuits, which affect their touch sensing capabilities.
Innovation Solution
The input sensing circuit design includes a base layer, a first conductive pattern, an insulating layer, and a second conductive pattern, with sub-patterns in a floating state to reduce the impact of short circuits, ensuring continuous operation even if defects occur.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insulating layer is used to prevent short circuits, then reliability is improved, but manufacturing precision deteriorates due to insulating film defects
Solution Approach 1:
The first conductive pattern is divided into multiple sub-patterns (first to fourth sub-patterns) that are spatially separated and electrically isolated. This segmentation ensures that a defect in one sub-pattern does not propagate to the entire conductive pattern, thereby maintaining reliability while reducing the impact of manufacturing defects.
Solution Approach 2:
The insulating layer is positioned between the first and second conductive patterns to provide preventive insulation against short circuits. Additionally, the floating sub-patterns act as buffer zones that can absorb potential defect propagation, cushioning the system against the harmful effects of insulating film defects before they can cause complete circuit failure.
2Measurement precision
If complex conductive patterns are used to improve touch sensing, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The conductive patterns are segmented into multiple sub-patterns with specific geometric configurations (first to fourth sub-patterns in the first conductive pattern, and corresponding sub-patterns in the second conductive pattern). This segmentation enables precise touch sensing through capacitive coupling between adjacent sub-patterns while keeping each individual sub-pattern simple in structure.
Solution Approach 2:
The touch sensing function is achieved by utilizing the spatial arrangement and relative positioning of multiple sub-patterns in two-dimensional space, rather than making individual patterns complex. The sensing capability arises from the geometric configuration and spacing between sub-patterns, transforming a potential complexity issue into a spatial design solution.
Data Source
AI summary
An input sensing circuit includes a first conductive pattern, a second conductive pattern, and an insulating layer disposed between the first conductive pattern and the second conductive pattern. At least some of wires forming the second conductive pattern overlap some of wires forming the first conductive pattern. The wires of the second conductive pattern overlapping the wires of the first conductive pattern are in a floating state.