Touch Screen Additional Sensing Electrode Edge Accuracy
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Solution Overview
Problem
Touch screens using the electrostatic capacitance method face challenges in accurately determining touch positions at the outer portions of the active area due to weak sensing signal intensities from the sensing electrodes.
Innovation Solution
Incorporating additional sensing electrodes located in the non-active area, which are insulated from the first and second sensing electrodes, to enhance touch recognition accuracy by providing additional signal input for the touch controller to determine touch positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensing electrodes are arranged only in the active area, then the device complexity is reduced, but the measurement precision of touch position deteriorates at outer portions of the active area
Solution Approach 1:
The patent extends the sensing electrode arrangement from the two-dimensional active area into the non-active area (a third spatial dimension relative to the display surface), allowing detection of touch positions at outer portions that were previously undetectable or inaccurate. This dimensional extension enables the sensing system to capture touch inputs near the edges by utilizing the non-active area as an additional sensing zone.
Solution Approach 2:
The sensing electrode system is segmented into multiple independent components: first sensing electrodes arranged in a first direction, second sensing electrodes arranged in a second direction intersecting the first direction, and additional sensing electrodes located in the non-active area. This segmentation allows each electrode group to independently contribute to touch detection, with the additional electrodes specifically enhancing detection accuracy at outer portions without interfering with the primary sensing electrodes.
2Measurement precision
If additional sensing electrodes are added in the non-active area, then the touch recognition accuracy at outer portions is improved, but the device complexity increases
Solution Approach 1:
The additional sensing electrodes in the non-active area serve multiple functions: they extend the detection range to outer portions of the active area, provide redundant sensing capability for edge touches, and maintain consistency with the existing sensing electrode architecture. This multi-functionality justifies the added complexity by delivering enhanced touch recognition accuracy without requiring a complete redesign of the sensing system.
Solution Approach 2:
The additional sensing electrodes are strategically positioned only in the non-active area where enhanced detection is needed, rather than uniformly distributing electrodes across the entire surface. This localized enhancement provides improved touch recognition accuracy specifically at outer portions while minimizing the overall increase in device complexity by concentrating additional electrodes only where required.
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
Improves the accuracy of touch recognition at the outer portions of the active area by utilizing the additional sensing electrodes to supplement weak signal intensities from the primary electrodes, thereby enhancing the precision of touch input detection.
Implementation Method 1
A touch screen apparatus using the electrostatic capacitance method senses a change in capacitance formed by a conductive sensing electrode along with another adjacent sensing electrode, a ground electrode, or the like when a finger of a user or a touch pen is in contact therewith
Data Source
AI summary
A touch screen apparatus includes: an active area and a non-active area outside the active area; first sensing electrodes arranged along a first direction in the active area; second sensing electrodes arranged along a second direction intersecting the first direction in the active area, the second sensing electrodes being insulated from the first sensing electrodes; and at least one additional sensing electrode separated from the first and second sensing electrodes, the at least one additional sensing electrode being located in the non-active area.