Touch Panel Time-Division Scanning Power Reduction
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Solution Overview
Problem
Conventional touch-sensitive panels consume excessive power due to continuous scanning of the entire panel, leading to long charging times and high energy consumption.
Innovation Solution
Implementing a time-division scanning method that divides the panel into regions, allowing for partial scanning and adjusting scanning time ratios to focus on important areas, thereby reducing power consumption without compromising performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous scanning of the entire panel is performed, then touch detection coverage is improved, but power consumption increases
Solution Approach 1:
The touch panel is divided into multiple scanning zones (first sensing region and second sensing region) that are scanned at different frequencies. The scanning circuit selectively activates specific sensing lines based on the scanning zone, reducing the overall scanning burden and power consumption while maintaining comprehensive touch detection coverage across the entire panel.
Solution Approach 2:
The patent implements periodic scanning with different frequencies for different zones. The first sensing region is scanned at a first frequency while the second sensing region is scanned at a second frequency, creating a time-division multiplexed scanning pattern that reduces average power consumption while maintaining detection reliability.
2Measurement precision
If continuous scanning of the entire panel is performed, then touch detection accuracy is improved, but charging time increases
Solution Approach 1:
The panel is segmented into multiple scanning zones with different scanning frequencies. By dividing the scanning task into zones, the system can maintain detection accuracy in critical areas while reducing the time required to scan less critical areas, thereby reducing overall charging time without sacrificing touch detection precision.
Solution Approach 2:
The patent applies partial scanning to certain zones by scanning only specific sensing lines within those zones at reduced frequencies. This partial action approach maintains sufficient detection accuracy for the overall panel while significantly reducing the total charging time required for complete scanning.
3Speed
If high-frequency scanning is performed across the entire panel, then touch response speed is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic scanning with different frequencies for different zones. The first sensing region is scanned at a first frequency while the second sensing region is scanned at a second frequency, creating a time-division multiplexed scanning pattern that reduces average power consumption while maintaining detection reliability.
Solution Approach 2:
Different scanning frequencies are applied to different zones based on their specific requirements. Critical zones that require faster response maintain higher scanning frequencies, while less critical zones use lower frequencies, optimizing the balance between response speed and power consumption locally across the panel.
Data Source
AI summary
Disclosure is related to a touch-sensitive panel apparatus, a control circuit, and a method for scanning touch event. The method is generally adapted to sensing a touch event when a touch object is used to contact a touch-sensitive panel device. The method in the beginning includes performing a time-division scanning process for separately scanning a first sensing region and a second sensing region according to a scanning timing scenario. After that, a triggering zone may be sensed when the scanning process finds a touch event. A full-time scanning process is then performed to the triggering zone. A touching position may be determined according to the scanning process. In one further embodiment, the method then verifies an operating frequency for the touch event so as to confirm a triggering event.