Touch Sensor Data Correction Using Differential Noise Removal
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Solution Overview
Problem
Touch sensing devices face reduced sensibility and accuracy due to noise and swing levels in output data, leading to recognition errors, especially when integrated circuits are deviated, and the cost of frame memories increases for data correction.
Innovation Solution
A touch sensing device with a touch sensor array and integrated circuits that convert output data into digital form, using a data correction unit to generate correction values from differential data and remove successive values exceeding a critical threshold, thereby reducing noise and swing levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If frame memories are used to correct touch data by comparing previous frame data with current frame data, then touch recognition accuracy is improved, but the cost of the touch signal processing circuit increases
Solution Approach 1:
The patent extracts and removes only the harmful components (swing level and noise) from the touch data without requiring frame memories. The data correction unit calculates correction values based on differential values between adjacent raw data, then removes only the corrected values that exceed a critical threshold, achieving accuracy improvement without the full complexity of frame-based correction systems
Solution Approach 2:
Instead of using expensive frame memories to store previous frame data, the patent uses a lightweight correction mechanism that processes data in real-time without requiring stored historical data. The correction values are calculated and applied immediately, discarding the need for costly memory resources while maintaining correction effectiveness
2Adaptability or versatility
If noise and swing level of touch data are increased, then the output range of touch sensors is expanded, but the sensibility of touch sensors is reduced
Solution Approach 1:
The patent converts the harmful noise and swing level into beneficial correction information. By calculating differential values between adjacent raw data, the system extracts the swing level pattern and uses it to generate correction values that compensate for the noise, effectively transforming the harmful variation into a useful correction signal that enhances sensibility
3Ease of manufacture
If deviation between integrated circuits is present, then manufacturing flexibility is improved, but touch recognition error occurs
Solution Approach 1:
The patent implements a feedback mechanism where the data correction unit continuously monitors and corrects deviations between integrated circuits. By calculating correction values based on the actual deviation patterns observed in the raw data, the system adapts to manufacturing variations and compensates for them in real-time, maintaining recognition accuracy despite circuit deviations
Data Source
AI summary
A touch sensing device and a method for correcting an output thereof are disclosed. The touch sensing device includes a touch sensor array including a plurality of touch sensors, a plurality of integrated circuits (ICs) that converts an output of the touch sensor array into digital data and generates raw data, and a data correction unit that generates correction values using differential values between adjacent raw data in the raw data generated by the ICs and removes successive correction values equal to or greater than a predetermined critical value from the correction values when a number of successive correction values equal to or greater than the predetermined critical value is less than a predetermined reference value.