Touch Panel Strain Threshold Adjustment for Water Interference
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Solution Overview
Problem
Electrostatic capacitive touch panels face issues with inconsistent strain detection due to the location of strain sensors, leading to variations in operation effectiveness and increased incorrect responses from electrical noise or water attachment, affecting the reliability of touch operations.
Innovation Solution
An electronic apparatus with a capacitive touch panel, a transparent member, and a pressure detection unit that adjusts the strain threshold value based on location, ensuring effective two-dimensional coordinate detection for touch operations while ignoring water attachment by setting a minimum threshold value higher than water-induced strain or noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a strain sensor is provided to detect pressure for determining operation effectiveness, then incorrect responses from water attachment are prevented, but variation in strain quantity occurs based on sensor location causing inconsistent operation detection
Solution Approach 1:
The patent applies local quality by setting different threshold values for strain quantity based on the location on the touch panel. The threshold value is adjusted according to the distance from the strain sensor, with higher thresholds for locations farther away and lower thresholds for locations closer to the sensor. This ensures consistent operation detection across the entire touch panel surface while maintaining the ability to detect incorrect responses from water attachment.
2Measurement precision
If the strain quantity threshold is set small to detect operations at panel ends, then operation detection is improved, but incorrect detection from electrical noise or vibration increases
Solution Approach 1:
The patent implements local quality by establishing location-dependent threshold values. For regions farther from the strain sensor where strain quantity is naturally lower, higher thresholds are set to prevent noise-induced false positives. For regions closer to the sensor where strain quantity is higher, lower thresholds enable sensitive detection. This spatially varying threshold approach resolves the contradiction between sensitivity and reliability.
3Reliability
If the strain quantity threshold is set large to avoid incorrect detection, then reliability is improved, but operations at panel ends cannot be effectively detected
Solution Approach 1:
The patent applies local quality by setting different threshold values for different locations on the touch panel. Locations closer to the strain sensor use lower thresholds to enable detection, while locations farther away use higher thresholds to prevent false positives. This ensures both reliable operation detection across the entire panel and effective coverage of panel ends.
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
This configuration ensures reliable two-dimensional coordinate detection for any point on the touch panel surface while preventing false responses from water or noise, enhancing operational effectiveness and accuracy.
Implementation Method 1
a pressure detection unit that detects strain of the transparent member
Implementation Method 2
an electrostatic capacitive touch panel that determines a two-dimensional coordinate indicated by an instructing object which has some conductivity
Data Source
AI summary
A strain quantity threshold value is set in accordance with a distance from a pressure detection unit for each divided predetermined subdivision which is obtained by dividing an operation surface of a touch panel unit into a plurality of subdivisions. The minimum value of the strain quantity threshold value is set to be a value larger than a strain quantity when water or the like is attached to the operation surface of the touch panel unit.