Touch Driving Method for Standby Power Reduction
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Solution Overview
Problem
Portable electronic devices face high power consumption during touch input detection in standby mode due to continuous output of touch driving signals, which reduces battery life and increases energy usage.
Innovation Solution
A touch driving method that switches between two operation modes: in standby mode, multiple touch electrodes are simultaneously scanned with a shorter first touch detection signal duration, and upon touch input detection, the mode shifts to a second touch mode where electrodes are scanned successively with a longer second touch detection signal duration, reducing overall power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch driving signals are continuously output during standby mode to detect touch input, then touch detection capability is maintained, but power consumption increases
Solution Approach 1:
The patent implements periodic touch scanning by alternating between wake-up scanning periods (where touch electrodes are actively scanned) and sleep periods (where scanning is suspended). During standby mode, the system performs touch detection only at specific intervals rather than continuously, thereby maintaining touch detection capability while significantly reducing power consumption during non-scanning periods
Solution Approach 2:
The system dynamically switches between two operational states: wake-up mode where touch electrodes are actively scanned with full functionality, and sleep mode where scanning is suspended to conserve energy. This dynamic state transition allows the system to adapt its power consumption level based on whether touch detection is currently needed
2Productivity
If touch electrodes are scanned simultaneously to reduce scanning time, then productivity improves, but power consumption increases
Solution Approach 1:
The patent segments the touch electrode scanning process into distinct phases: wake-up scanning phase where multiple electrodes are scanned in parallel to achieve fast detection, and sleep phase where scanning is suspended. By dividing the operational timeline into these segments rather than attempting to optimize a single continuous scanning process, the system achieves fast scanning when needed while conserving energy during non-scanning periods
Data Source
AI summary
A touch driving method and device, an operation mode switching method, a touch devices, and an electronic device are provided, the method includes: controlling a driver module to output a first touch detection signal; controlling a selector module to simultaneously transmit the first touch detection signal outputted by the driver module corresponding to the selector module to n touch electrodes connected to the selector module; detecting whether there is touch input and, when there is the touch input, controlling the driver module to output a second touch detection signal; and controlling the selector module to successively transmit the second touch detection signal outputted by the driver module corresponding to the selector module to the n touch electrodes connected to the selector module.