Touch Panel Noise Cancellation via Sub-Sensor Signal Difference
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Solution Overview
Problem
Conventional touch panel systems are unable to reliably remove a wide variety of noises and often result in incorrect operations due to unintended contacts, leading to impaired detection sensitivity and user inconvenience.
Innovation Solution
A touch panel system with a main sensor and a sub sensor section, where the sub sensor detects noise signals and the subtracting section calculates differences between adjacent sense lines to remove noise from the main sensor's output, and a touch invalidating section prevents instructions based on continuous touches, ensuring accurate touch detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a touch panel system uses noise processing to remove noise signals, then detection sensitivity is improved, but the system cannot reliably remove a wide variety of noises
Solution Approach 1:
The sensor section is divided into multiple sense lines (first sense line, second sense line, third sense line) that detect different noise components. The noise processing section is segmented into multiple subtracting sections, each handling specific noise types by calculating differences between adjacent sense lines. This segmentation enables comprehensive noise removal across various frequency ranges while maintaining detection sensitivity.
2Ease of operation
If the touch panel detects continuous touches to prevent incorrect operations, then user convenience is improved, but detection sensitivity may be compromised
Solution Approach 1:
The touch invalidating section performs preliminary evaluation by calculating the time span between consecutive touch detections. Before executing a touch operation, the system checks whether the time interval exceeds a predetermined threshold. This preliminary action filters out unintended continuous touches (such as hand contact during holding) while preserving legitimate touch operations, thereby preventing incorrect operations without compromising detection sensitivity.
Data Source
AI summary
A touch panel system prevents an incorrect operation caused by an unintended contact of an object with a touch panel while suppressing a decline in sensitivity of detection of presence or absence of a touch on the touch panel. The touch panel system includes a touch invalidating section which, in a case where a specific point of a touch panel is continuously touched for a predetermined period of time, invalidates an instruction that is given, in accordance with the touch, to an electronic device including the touch panel.