Touch Detection Device Noise Reduction via Periodic Reset and Interpolation
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Solution Overview
Problem
Existing touch detection systems in electronic devices face inaccuracies due to display noise in signals received from touch panels, which can lead to incorrect detection of touch coordinates and pressure.
Innovation Solution
A touch detection device and method that incorporates a current-to-voltage converter, analog-to-digital converter, and a controller for data interpolation, which periodically resets the analog front end to remove noise and reconstruct continuous data values from non-continuous signals, thereby enhancing the accuracy of touch detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the analog front end is periodically reset to remove noise, then noise reduction is improved, but data continuity deteriorates
Solution Approach 1:
The controller performs data interpolation in advance to reconstruct continuous data values before noise removal operations are completed, ensuring that the final output maintains data continuity even after periodic resetting of the analog front end
Solution Approach 2:
The controller acts as an intermediary between the periodic reset operations and the output signal generation, using data interpolation to bridge the gaps created by resetting, thus maintaining data continuity while allowing noise removal to proceed
2Stability of the object's composition
If data interpolation is performed on non-continuous signals, then data continuity is improved, but processing complexity increases
Solution Approach 1:
The controller segments the data processing into distinct phases: identifying non-continuous periods, performing interpolation only on those specific segments, and combining with continuous periods, thereby reducing overall processing complexity compared to processing the entire signal
Solution Approach 2:
The controller applies data interpolation only to the specific non-continuous periods rather than processing the entire signal continuously, reducing the total computational load and device complexity while achieving the necessary data continuity
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
The solution effectively minimizes the influence of noise, improving the accuracy of touch detection and enabling precise recognition of touch coordinates and pressure on touch panels.
Implementation Method 1
a current-to-voltage converter configured to convert a reception signal received from a touch panel into a sensing signal
Implementation Method 2
an analog-to-digital converter configured to convert an analog signal, generated based on the sensing signal, into a first digital output signal
Data Source
AI summary
A touch detection device and a method of detecting a touch employ: a current-to-voltage converter configured to convert a reception signal received from a touch panel into a sensing signal, and further configured to be periodically reset for a first time period in response to a reset signal; a digital-to-analog converter configured to convert an analog signal based on the sensing signal into a first digital output signal, and a controller configured to generate a second digital output signal based on the first digital output signal by performing data interpolation on a first portion of the first digital output signal corresponding to the first time period.