Non-Rectangular Touch Panel Sensor Cell Deformation
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Solution Overview
Problem
Non-rectangle shaped touch panels often lack sufficient space for transmission and reception electrodes at the outer edge, leading to decreased accuracy in touch position detection due to insufficient capacitance change.
Innovation Solution
The touch panel device arranges sensor cells in a non-rectangle shape by deforming rectangle-shaped sensor cells using conversion coefficients based on vertex coordinates, ensuring equal numbers of cells in rows and columns, and applying bilinear transformation to maintain regularity and space, allowing accurate touch position detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the touch panel is designed with a non-rectangle shape to fit equipment product design requirements, then the adaptability of the touch panel is improved, but the disposing space for transmission electrodes and reception electrodes at the outer edge portion is reduced, causing a decrease in touch position detection accuracy
Solution Approach 1:
The touch panel is divided into multiple sensor cells arranged in a matrix pattern, where each sensor cell independently contributes to touch detection. This segmentation allows the overall non-rectangle shaped touch panel to maintain adequate electrode spacing within each cell, preserving detection accuracy while achieving the desired outer shape.
Solution Approach 2:
The invention applies different design considerations to different regions of the touch panel. By structuring sensor cells with consistent internal geometry and electrode arrangement, the local quality of each sensor cell maintains optimal detection characteristics, while the global shape adapts to equipment requirements through the overall arrangement of these standardized cells.
2Adaptability or versatility
If transmission electrodes and reception electrodes are disposed to fit a non-rectangle shape, then the shape adaptability is improved, but the capacitance change required for touch position detection cannot be properly obtained at the outer edge portion, causing a decrease in detection accuracy
Solution Approach 1:
The touch detection function is segmented into multiple independent sensor cells, each maintaining sufficient electrode dimensions for reliable capacitance measurement. This segmentation ensures that even in a non-rectangle shaped panel, each sensor cell generates adequate capacitance change for accurate touch detection, preventing edge portion detection failures.
Solution Approach 2:
The invention maintains consistent geometric parameters and electrode configurations within each sensor cell regardless of the overall panel shape. By preserving these critical parameters at the local sensor cell level, the system ensures reliable capacitance change detection while allowing the global panel geometry to adapt to various shapes.
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 solution ensures accurate touch position detection without defects in sensor cells, even in non-rectangle shaped touch panels, by ensuring sufficient space for electrodes and maintaining detection accuracy across varying shapes.
Implementation Method 1
a user's touch position is detected based on a change in capacitance generated from a detection region constituted of a pair of the transmission electrode and the reception electrode
Data Source
AI summary
A touch panel device includes a plurality of transmission electrodes and a plurality of reception electrodes disposed in a sensing region on a substrate, the transmission electrodes and the reception electrodes forming a sensor cell, wherein the sensing region has a non-rectangle shape, a plurality of the sensor cells is arranged in the sensing region in a row direction and in a column direction, and each sensor cell has a region shape according to a shape of the sensing region such that number of the sensor cells in respective rows is the same and number of the sensor cells in respective columns is the same.