Edge Sensing Electrode Patterns for Touch Input Accuracy
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Solution Overview
Problem
Existing electronic devices face challenges in accurately detecting inputs, particularly in edge areas, due to insufficient sensitivity and pattern density, leading to errors in coordinate calculation for external inputs like pens.
Innovation Solution
The electronic device incorporates a first and second sensing electrode with specific edge patterns in the active area, forming capacitance and connected by sensing lines, with edge patterns having smaller surface areas and distinct shapes to enhance sensitivity and accuracy in edge areas by increasing pattern density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uniform patterns are used across the entire active area, then manufacturing is simple, but sensitivity in edge areas is insufficient
Solution Approach 1:
The patent applies local quality by configuring different sensing patterns for different regions of the display panel. Specifically, edge patterns are designed with smaller sizes and different arrangements compared to center patterns, allowing the edge areas to have enhanced detection sensitivity while the center maintains standard performance. This regional differentiation resolves the contradiction by optimizing each area according to its specific detection needs rather than using a uniform design throughout.
Solution Approach 2:
The sensing electrode pattern is segmented into distinct types: center patterns for the main display area and edge patterns for the peripheral areas. This segmentation allows independent optimization of each pattern type according to the specific requirements of its location. The edge patterns are specifically designed with smaller dimensions and different spacing to improve sensitivity in edge regions without affecting the overall manufacturing process complexity.
2Measurement precision
If pattern density is increased in edge areas, then detection accuracy improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent implements local quality by designing edge patterns with smaller sizes and different configurations compared to center patterns. This allows increased effective pattern density in edge areas to improve coordinate calculation accuracy without requiring proportionally higher manufacturing precision across the entire panel. The differentiated design enables targeted optimization for edge detection while maintaining reasonable manufacturing tolerances.
3Reliability
If edge patterns are added to improve sensitivity, then detection performance increases, but device complexity increases
Solution Approach 1:
The patent merges the functionality of center and edge sensing patterns into a unified electrode structure. The edge patterns are integrated with the center patterns through continuous conductive layers, allowing both regions to function together as a cohesive sensing system. This merging approach improves edge area sensitivity while avoiding the complexity of completely separate electrode systems, as the patterns share common conductive pathways and control circuits.
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 improves sensitivity and accuracy in detecting external inputs across the entire active area, including edge regions, by providing consistent and precise coordinate calculation for inputs, reducing errors and enhancing overall input detection performance.
Implementation Method 1
a first sensing electrode and a second sensing electrode that overlap the pixels when viewed in a plane, and that are configured to form mutual capacitance
Data Source
AI summary
An electronic device includes first and second sensing electrode configured to form capacitance with each other, and sensing lines respectively connected to the first sensing electrode and the second sensing electrode, wherein the first sensing electrode includes first patterns in a main area, arranged in a first direction, and extending in a second direction crossing the first direction, a first edge pattern in an edge area that is between the main area and a peripheral area, is spaced apart from the first patterns in the first direction, and extends in the second direction, and a second edge pattern that is in the edge area, is spaced apart from the first edge pattern in the first direction, and extends in the second direction, and wherein a planar surface area of each of the first and second edge patterns is smaller than a planar surface area of each of the first patterns.