Touch Panel Scan Control for Low-Power Idle Response
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Solution Overview
Problem
The power consumption of touch systems in electronic devices is significant and affects overall device performance, particularly in terms of standby time.
Innovation Solution
Implementing a touch system control method that reduces the scanning and data reporting frequencies when no valid touch signal is detected, transitioning between active, async idle, and idle modes to conserve power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the touch system maintains high scanning frequency and data processing frequency to ensure responsive touch detection, then touch response speed is improved, but power consumption increases significantly
Solution Approach 1:
The patent implements dynamic frequency adjustment where the touch system transitions between different operating modes (active mode, async idle mode, and idle mode) based on touch activity state. In active mode, high scanning frequency is maintained for responsive touch detection. When no touch is detected, the system switches to async idle mode with reduced data reporting frequency or idle mode with minimal scanning, thereby adapting the processing frequency to actual needs and reducing power consumption while maintaining responsive touch detection when required
Solution Approach 2:
The patent employs periodic action by implementing periodic scanning at different frequencies depending on the operational state. The touch chip periodically scans for conductor signals and the host periodically processes data based on the detected state. This periodic action with variable periods allows the system to maintain touch responsiveness when needed while reducing processing activity during idle periods, thus balancing response speed and power consumption
2Measurement precision
If the host processes touch data at high frequency to maintain accurate touch position tracking, then touch position accuracy is improved, but host processing load and power consumption increase
Solution Approach 1:
The patent implements dynamic processing frequency adjustment where the host transitions between high-processing active mode and low-processing idle modes based on touch detection results. When touch events are detected, the host processes data at high frequency to maintain accurate position tracking. When no touch events occur, the host reduces processing frequency or enters idle state, significantly reducing power consumption while maintaining measurement precision during active use
Solution Approach 2:
The patent employs feedback mechanisms where the host receives feedback from the touch chip about conductor signal detection and adjusts its processing frequency accordingly. The touch chip feeds back information about detected conductors, and the host uses this feedback to dynamically adjust its data processing frequency, reducing host power consumption during idle periods while maintaining accurate touch position tracking when needed
Data Source
AI summary
This application provides a touch system control method and an electronic device. The method includes: in an active mode, controlling, by a touch chip, a touch panel to perform two-dimensional data scanning at a first frequency to obtain first scanned data; sending, by the touch chip, the first scanned data to a host at the first frequency; when the host determines, according to the first scanned data, that no valid touch signal is detected, switching, by the host, to an async idle mode, where in the async idle mode, the touch chip controls the touch panel to perform two-dimensional data scanning at the first frequency to obtain second scanned data, and sends the second scanned data to the host at a second frequency; the second frequency is less than the first frequency.