Capacitive Touch Panel Partial Line Scanning for Detection Speed
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Solution Overview
Problem
Current capacitive touch panels require multiple all line scans to detect operations like double click, slide, and drag, leading to prolonged detection times and increased power consumption, which hampers high-speed and accurate operation.
Innovation Solution
Applying pulses to a selected subset of pulse lines in a specific order instead of scanning all lines simultaneously, allowing for efficient detection of touch positions while reducing power consumption by switching between modes based on operation types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If all line scan is performed to detect touch position, then detection accuracy is maintained, but detection time increases
Solution Approach 1:
The pulse lines are divided into multiple groups, and only selected groups are scanned at a time rather than scanning all lines. This segmentation allows the system to maintain detection accuracy for the relevant touch area while reducing the overall scanning time by processing lines in manageable segments.
Solution Approach 2:
Instead of scanning all pulse lines, the system performs partial scanning by selecting only certain groups of pulse lines based on the detected touch position. This partial action reduces detection time while maintaining accuracy by focusing scanning resources on the most relevant areas.
2Reliability
If all line scan is performed twice to recognize double click or slide operation, then operation recognition accuracy is improved, but power consumption increases
Solution Approach 1:
The operation recognition process is segmented into multiple stages with different scanning intensities. Initial touch detection uses full scanning for accuracy, while subsequent operations use reduced scanning of selected line groups, thereby maintaining reliability while reducing overall power consumption.
Solution Approach 2:
The scanning strategy dynamically adapts based on the detected operation type. For common operations like double-click or slide, the system uses optimized partial scanning patterns that reduce power consumption while maintaining accurate recognition through intelligent selection of which line groups to scan.
3Measurement precision
If number of pulse lines is increased to improve detection accuracy, then measurement precision improves, but detection time increases
Solution Approach 1:
The large number of pulse lines are organized into multiple groups that can be scanned independently and in parallel. This segmentation allows the system to maintain high detection precision across the entire touch panel area while improving detection speed by dividing the scanning task into smaller, manageable segments.
Solution Approach 2:
The system performs partial scanning by selecting only certain groups of pulse lines based on preliminary touch detection results. This approach maintains high measurement precision for the touched area while reducing overall detection time by avoiding unnecessary scanning of unrelated line groups.
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 approach significantly reduces detection time for common operations like double click and slide while maintaining accuracy for drag operations, thereby enhancing operational speed and reducing power usage.
Implementation Method 1
a change in capacitance between one of the pulse lines P1 to Pn and one of the sense lines S1 to Sm is detected by the detecting circuit, whereby the touched position is detected
Data Source
AI summary
A touch panel includes n first line electrodes (n is an integer of 2 or greater) to which pulses are applied, m second line electrodes (m is an integer of 2 or greater) for use in detection, the second line electrodes being arranged to cross the first line electrodes, and a pulse generating circuit configured to apply pulses, in a selected order, to n1 first line electrodes (n1 is an integer of at least 1 and not greater than n) selected from among the n first line electrodes. A touched position on the touch panel is detected by detecting a change in capacitance between one of the first line electrodes and one of the second line electrodes.