Operation Detection Device Dynamic Threshold Touch Stability
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Solution Overview
Problem
Existing information input devices with increased sensitivity for small capacitance changes lead to unstable coordinate detection during hovering operations, affecting touch operability.
Innovation Solution
An operation detection device comprising a detection unit that outputs capacitance values and a determination unit with dynamic threshold conditions based on maximum and minimum detection values to accurately determine the start and end of touch operations, reducing the impact of object size and shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensitivity is increased to detect small capacitance changes, then the detection capability for small fingers is improved, but false detection during hovering operation occurs
Solution Approach 1:
The patent applies dynamics by making the determination threshold dynamic rather than fixed. The threshold is adjusted based on the relationship between the detection value and its rate of change, allowing the system to adapt to different operational states (hovering vs. touching) and eliminate false detections while maintaining sensitivity for small capacitance changes
Solution Approach 2:
The patent changes the parameter of the determination threshold from a fixed value to a dynamically adjusted value. By modifying the threshold based on the detection value and its rate of change, the system can distinguish between legitimate touch operations and hovering states, resolving the contradiction between sensitivity and reliability
2Adaptability or versatility
If the sensitivity is increased to suit a finger with a small capacitance change, then small fingers can be detected, but coordinates detected during hovering operation become unstable
Solution Approach 1:
The system dynamically adjusts the determination threshold based on real-time detection values and their rates of change. This allows the system to maintain high sensitivity for detecting small capacitance changes from different finger sizes while simultaneously suppressing false detections during hovering, thus maintaining coordinate stability
Solution Approach 2:
The patent implements feedback by using the rate of change of the detection value to adjust the determination threshold. This feedback mechanism allows the system to learn from recent detection patterns and adapt the threshold accordingly, ensuring stable coordinate detection across different finger sizes and operational states
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 device stabilizes coordinate detection during hovering operations by using dynamic threshold conditions, effectively suppressing instability and improving touch operability by accurately distinguishing between touch and hovering states.
Implementation Method 1
a first detection unit to detect a change in capacitance caused by approach of a finger of an operator to the electrode wires
Data Source
AI summary
An operation detection device includes a detection unit to detect a touch operation in an operation surface by a detected object and to output a detection value based on a capacitance to increase from before the touch operation, and a determination unit to hold a determination threshold value to determine a start of the touch operation, to output a touch start determination to determine the start of the touch operation when the detection value becomes not less than the determination threshold value, and to output a first deemed determination to determine an end of the touch operation when a first condition, which is based on a maximum detection value after the touch start determination, is satisfied.