Capacitive Touch Panel With Segmented Sensor Array
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Solution Overview
Problem
Capacitive touch sensors face challenges in achieving high touch accuracy while minimizing manufacturing costs, particularly in one-dimensional sensor arrays, which are limited by the number of connecting lines required for sensing accuracy and the complexity of wiring design.
Innovation Solution
A touch panel design featuring a substrate with a sensor array composed of central and surrounding sensor elements, where each sensor element is connected by a dedicated connecting line, allowing for reduced sensor element count and improved accuracy through capacitive coupling between adjacent lines, enabling more precise touch detection with fewer lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a one-dimensional sensor array is used to reduce cost, then manufacturing cost decreases, but touch accuracy and coordination precision deteriorate
Solution Approach 1:
The sensor array is divided into multiple independent sensor elements arranged in one dimension, with each element having its own connecting line. This segmentation allows for cost-effective manufacturing while maintaining adequate touch detection capability through the distributed arrangement of elements.
Solution Approach 2:
The patent transitions from traditional two-dimensional sensor arrays to a one-dimensional arrangement, reducing the complexity and cost of the sensor structure. By organizing sensor elements in a single row and using capacitive coupling between adjacent connecting lines, the system achieves acceptable touch accuracy with simplified manufacturing.
2Measurement precision
If the number of sensor elements is increased to improve touch accuracy, then measurement precision improves, but the number of connecting lines and wiring complexity increases
Solution Approach 1:
Capacitive coupling serves as an intermediary mechanism between adjacent connecting lines. Instead of requiring separate complex wiring for each sensor element, the electric field coupling between neighboring lines enables signal transmission and touch detection, significantly reducing wiring complexity while maintaining multiple sensor elements for accurate touch detection.
3Device complexity
If capacitive coupling is used between adjacent connecting lines, then the number of connecting lines can be reduced, but signal interference and noise may increase
Solution Approach 1:
The system uses periodic scanning of adjacent connecting lines to detect touch events. By sequentially activating and scanning neighboring lines with capacitive coupling, the system can distinguish between genuine touch signals and noise through the periodic measurement pattern, reducing signal interference while maintaining a reduced number of connecting lines.
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 design enhances touch accuracy and reduces the number of connecting lines, simplifying wiring and interface design, while maintaining performance comparable to two-dimensional sensor arrays at a lower cost.
Implementation Method 1
capacitive coupling between adjacent lines, enabling more precise touch detection with fewer lines
Data Source
AI summary
A touch panel includes a substrate defining thereon a touch sensing region; a sensor array formed in the touch sensing region; and connecting lines arranged on the substrate and corresponding to the sensor elements one on one. The sensor array consists of sensor elements separately positioned on the substrate, and defined as a plurality of groups, wherein the sensor elements in the same group include a central sensor element and a plurality of surrounding sensor elements. Each of the connecting lines is connected to one and only one of the sensor elements corresponding thereto. The surrounding sensor elements are defined as a plurality of sets of surrounding sensor elements, which are respectively driven with corresponding connecting line or lines, and return signals for determining which part of the central sensor element is touched.