Static Capacitance Touch Panel Noise Reduction
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Solution Overview
Problem
Existing static capacitance type touch panels face issues with noise interference, leading to erroneous touch detection and inaccuracies in calculating the touched position, particularly with quick touches and failure to account for noise influence in position calculation.
Innovation Solution
A touch panel detection method that sets a touch threshold to differentiate between noise and actual touch, applying higher weighted values to sensors near the touched position for accurate calculation, allowing for quick touch detection and minimizing noise-induced position discrepancies through a software-based process without increasing hardware costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a predetermined period threshold is used for touch detection, then erroneous detection due to noise is prevented, but quick touch detection fails
Solution Approach 1:
The patent changes the detection parameter from a time-based threshold (predetermined period) to a value-based threshold (predetermined value). This allows immediate detection when the measured value exceeds the threshold, eliminating the delay inherent in time-based methods while maintaining reliability through carefully selected threshold values that distinguish actual touches from noise.
2Device complexity
If noise influence is not considered in position calculation, then calculation process is simple, but touched position accuracy decreases
Solution Approach 1:
The patent applies local quality by assigning different weights to different sensors based on their proximity to the touched position. Sensors closer to the touch point receive higher weights in the position calculation, while those farther away receive lower weights. This localized weighting approach improves position accuracy by emphasizing relevant sensor data without requiring complex noise filtering across the entire system.
3Measurement precision
If higher weighted values are applied to sensors near touched position, then position calculation accuracy improves, but calculation complexity increases
Solution Approach 1:
The patent simplifies the weighted calculation by using a systematic approach where weights are determined based on the relative positions of sensors to the touch point. Rather than requiring complex adaptive algorithms, the system uses predetermined weighting schemes based on geometric relationships, making the calculation both accurate and computationally efficient.
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
Enables accurate and rapid touch detection with reduced noise interference, ensuring precise calculation of the touched position without hardware cost increments.
Implementation Method 1
a static capacitance type touch panel
Data Source
AI summary
A static capacitance type touch panel, a control unit electrically connected with X and Y electrodes for detecting a touch position based on a measured value of a static capacitance between the X and Y electrodes. The control unit includes a predetermined touch threshold for detecting a peak, a near-peak range and a non-near-peak range, a first parameter for determining a value of the near peak range, and a second parameter for determining a value of the non-near-peak range. The first and second parameters are respectively predetermined for reduction of a noise influence from the measured value of the static capacitance between the X electrode and the Y electrode.