Touch Detection Wait Time Adjustment for Multi-Touch Accuracy
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Solution Overview
Problem
Existing display devices face challenges in accurately detecting touch operations, particularly in distinguishing between single and multi-touch gestures due to timing discrepancies and environmental factors, leading to erroneous determinations and reduced responsiveness.
Innovation Solution
A display device with a first touch detection unit, a setting unit for wait time based on touch position, and a multi-touch determination unit that determines touches as multi-touch if a second touch is detected before a set wait time, and as single-touch if the wait time passes without a second touch, addressing the timing and environmental issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed measurement time is used to detect multi-touch, then the detection criteria are simple, but the accuracy is reduced when fingers touch at slightly different times
Solution Approach 1:
The patent applies dynamics by making the measurement time variable rather than fixed. The control unit dynamically adjusts the measurement time based on the specific touch detection scenario, allowing the system to accommodate slight timing differences between fingers during pinch gestures while maintaining accurate distinction between single and multi-touch operations.
Solution Approach 2:
The patent changes the parameter of measurement time from a constant value to a variable that can be adjusted based on detection needs. By modifying the time parameter adaptively, the system improves its ability to detect multi-touch gestures where fingers contact the screen at slightly different moments, without requiring complex hardware modifications.
2Measurement precision
If a long measurement time is used, then multi-touch detection accuracy is improved, but the responsiveness of the system is reduced
Solution Approach 1:
The system dynamically adjusts the measurement time duration based on the detected touch pattern and context. Rather than using a consistently long measurement time that would slow down all operations, the control unit applies extended measurement periods only when multi-touch detection is anticipated or required, maintaining fast response for single-touch operations.
Solution Approach 2:
The patent applies partial action by using extended measurement time only when necessary for accurate multi-touch detection, rather than applying it continuously. This allows the system to achieve high detection accuracy for pinch gestures while avoiding the responsiveness penalty that would result from always using the longest measurement time.
3Speed
If a short measurement time is used, then system responsiveness is improved, but the accuracy of detecting simultaneous touches is reduced
Solution Approach 1:
The control unit dynamically selects the appropriate measurement time duration based on the touch detection context. For operations where rapid response is critical and multi-touch is unlikely, a shorter measurement time is used. When pinch gestures or multi-touch are detected or anticipated, the system extends the measurement time to ensure accurate detection of simultaneous finger contacts.
4Quantity of substance
If the screen displays reduced-size software keys to fit more information, then information density is improved, but touch detection accuracy is reduced due to timing discrepancies
Solution Approach 1:
The patent changes the time parameter of touch detection to accommodate the reduced-size interface layout. By adjusting the measurement time parameter, the system compensates for the increased likelihood of timing discrepancies that arise when users interact with smaller, more densely packed software keys, thereby maintaining accurate distinction between single and multi-touch operations.
Data Source
AI summary
An MFP (Multi Function Peripheral) serving as a display device detects a touch on the touch panel and then sets a wait time in accordance with the position of the touch on the touch panel. If another touch is detected before the wait time has passed since the touch on the touch panel is detected, the MFP determines that the detected two touches are multi-touch. If the wait time has passed without detecting another touch since the touch on the touch panel is detected, the MFP determines that the detected touch is single touch.