Touch Screen Panel With Segmented Sensing Electrodes
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Solution Overview
Problem
Capacitive touch screen panels face limitations in touch recognizing sensitivity due to the reliance on a single sensing signal per driving signal, which can lead to reduced accuracy and effectiveness in detecting touch positions.
Innovation Solution
The implementation of a mutual capacitive touch screen panel with driving electrodes and sensing electrodes arranged in intersecting directions, featuring different shapes to form multiple sensing sets, allowing for the simultaneous detection of capacitance changes between driving and adjacent sensing electrodes, thereby enhancing sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single sensing electrode is used per driving electrode, then the device complexity is reduced, but the touch recognizing sensitivity deteriorates
Solution Approach 1:
The sensing electrode is divided into multiple segments (first sensing electrode and second sensing electrode) with different shapes, allowing each segment to detect capacitance changes from different touch positions. This segmentation enables multiple sensing signals to be obtained from a single driving electrode, improving touch recognizing sensitivity without significantly increasing overall device complexity
Solution Approach 2:
Different segments of the sensing electrode are designed with different local qualities (shapes) - the first sensing electrode has a first shape and the second sensing electrode has a second shape. This allows each local region to be optimized for detecting touches from specific directions or positions, thereby improving overall measurement precision while maintaining a manageable device structure
2Measurement precision
If multiple sensing electrodes with different shapes are arranged to not overlap driving electrodes, then the touch detection accuracy is improved, but the area occupied by electrodes increases
Solution Approach 1:
The patent utilizes the spatial dimension by arranging sensing electrodes at different positions and orientations around the driving electrode. The first and second sensing electrodes are positioned to detect capacitance changes from different directions, effectively using spatial dimensionality to improve detection accuracy without requiring a proportional increase in total electrode area
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 touch recognizing sensitivity by securing multiple sensing signals to the same driving signals, increasing the accuracy and reliability of touch position detection.
Implementation Method 1
the capacitive type touch screen panel converts a contact position into a electrical signal, when the conductive sensing cells sense a change in the capacitance formed other adjacent sensing cells by contacting the panel with a user's hand or object
Data Source
AI summary
A touch screen panel includes a substrate comprising a major surface and divided into an active area and a non-active area when viewed in a viewing direction perpendicular to the major surface; a plurality of driving electrodes formed over the active area of the substrate and generally arranged along a first direction; a plurality of first sensing electrodes formed over the active area of the substrate and generally arranged along a second direction; and a plurality of second sensing electrodes formed over the active area of the substrate and arranged along the second direction. The shapes of the first sensing electrode and the second sensing electrode are different from each other.