Touch Sensor Corner Pattern Density for Consistent Capacitance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional touch panels face challenges in maintaining consistent touch sensitivity and capacitive loading across different locations, particularly at corners, edges, and areas with reduced size, leading to variations in signal processing and detection accuracy.
Innovation Solution
The implementation of touch electrode cells with varying pattern densities, where the area of patterned conductive material per unit area differs across the touch panel, especially at corners, edges, and notches, to enhance sensitivity and capacitive loading, thereby reducing signal processing complexity and maintaining consistent touch detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uniform pattern density is used across the touch panel, then manufacturing is simpler, but touch sensitivity and capacitive loading become inconsistent at corners and edges
Solution Approach 1:
The patent applies local quality by varying the pattern density of conductive material specifically at corner and edge regions of the touch panel, while maintaining uniform density in central areas. This localized modification compensates for the reduced capacitive loading at boundaries, ensuring consistent touch sensitivity across the entire panel without requiring complex global restructuring.
Solution Approach 2:
The patent changes the physical parameter of pattern density in specific regions to compensate for area variations. By increasing the density of conductive patterns at corners and edges where the effective sensing area is reduced, the capacitive loading is normalized across all regions, maintaining reliable touch detection without proportionally increasing overall material usage.
2Area of stationary object
If the touch panel area is reduced at corners and edges, then the overall device size decreases, but touch detection accuracy deteriorates in those regions
Solution Approach 1:
The patent applies local quality by implementing region-specific pattern density adjustments. Corner and edge regions receive enhanced pattern density compared to central regions, compensating for their smaller effective area. This localized optimization ensures that touch detection accuracy remains consistent across the entire panel despite area variations.
Solution Approach 2:
The patent changes the pattern density parameter in response to area variations. By dynamically adjusting the density of conductive patterns based on the local area available at each position (higher density at smaller corner/edge areas, lower density at larger central areas), the capacitive loading is normalized, maintaining accurate touch detection across the full panel area.
3Device complexity
If signal processing complexity is reduced, then device complexity decreases, but maintaining consistent detection accuracy becomes more difficult
Solution Approach 1:
The patent applies preliminary action by pre-compensating for expected variations in capacitive loading through spatially varying pattern density during the manufacturing stage. This proactive design approach eliminates the need for complex real-time signal processing corrections, as the hardware itself is designed to produce uniform electrical characteristics across all regions, thereby reducing both processing complexity and maintaining accuracy.
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 approach ensures consistent touch sensitivity and capacitive loading across the touch panel, improving detection accuracy and reducing signal processing needs by compensating for area variations with increased pattern density at critical locations.
Implementation Method 1
the area of patterned conductive material per unit area can be different for different touch electrode cells of the touch panel... to enhance sensitivity and capacitive loading
Data Source
AI summary
A touch panel includes an array of touch electrode cells, each touch electrode cell including portions of a plurality of touch electrodes, such as portions of intersecting row and column touch electrodes that include a patterned conductive material. In some examples, the area of patterned conductive material per unit area can be different for different touch electrode cells of the touch panel. For example, the touch panel can include touch electrode cells with increased pattern densities at locations where the overall area of the touch electrode cell may be less than the overall area of other touch electrode cells in the touch panel, such as at corners, notches, perforations, and/or edges of the touch panel.