Capacitive Touch Detection Through Hygroscopic Cover Materials
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Solution Overview
Problem
Detection accuracy in capacitive touch panels deteriorates due to changes in permittivity of hygroscopic non-conductive front surface covering materials caused by humidity variations.
Innovation Solution
A detection device with a hygroscopic non-conductive front surface covering member that adjusts signal values using an adjustment coefficient based on the correspondence between signal values acquired in non-detection operations and moisture content, thereby maintaining detection accuracy despite humidity changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a front surface covering member made of hygroscopic non-conductive material is provided on the touch panel, then the natural appearance and feel are improved, but the detection accuracy deteriorates due to permittivity changes caused by humidity variations
Solution Approach 1:
The patent applies parameter changes by introducing an adjustment coefficient that varies based on moisture content measurements. The detector changes the signal value parameter according to the measured moisture content of the front surface covering member, thereby compensating for permittivity changes and maintaining detection accuracy despite humidity variations
Solution Approach 2:
The patent implements feedback by measuring the moisture content of the front surface covering member and using this information to adjust the signal value. The detector continuously monitors moisture content and dynamically adjusts detection parameters based on this feedback, creating a closed-loop system that maintains accuracy under varying humidity conditions
2Measurement precision
If signal value adjustment based on moisture content is implemented, then detection accuracy is maintained, but device complexity increases
Solution Approach 1:
The patent applies universality by integrating multiple functions into the detector: it performs both the primary detection function and the moisture content-based signal adjustment function. The detector is designed to handle both detection operations and non-detection operations (moisture measurement), reducing the need for separate dedicated components and minimizing overall device complexity
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 suppresses detection accuracy deterioration by adjusting signal values to compensate for permittivity changes in the front surface covering member, ensuring consistent detection performance.
Implementation Method 1
a front surface covering member made of hygroscopic non-conductive material and covering the detection region
Implementation Method 2
the permittivity of the front surface covering member may possibly change due to a change in humidity
Data Source
AI summary
According to an aspect, a detection device includes: a detection region provided with a plurality of electrodes; a front surface covering member made of hygroscopic non-conductive material and covering the detection region; and a detector configured to detect an object to be detected in proximity to the detection region with the front surface covering member interposed between the object to be detected and the detection region. The detector acquires an adjustment coefficient for adjusting a signal value acquired when detecting the object to be detected, based on a correspondence between a signal value acquired in a non-detection operation in which the object to be detected is not detected and a moisture content of the front surface covering member.