Touch Display System Idle Mode Power Reduction via Dynamic Scanning
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Solution Overview
Problem
Existing touch display systems face challenges in reducing power consumption during the idle mode while ensuring quick switching to the activation mode without compromising user experience, particularly when handling fast finger inputs.
Innovation Solution
The method involves dividing the frame into sub-frames with separate display and touch control time periods, short-circuiting touch sensing channels in idle mode, and scanning one channel in each sub-frame, with reduced frequency for touch control scanning in idle mode compared to activation mode, using first-frame data as reference for touch detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the touch control scanning frequency is reduced in idle mode to save power consumption, then power consumption is reduced, but the system cannot detect fast finger inputs and cannot switch to activation mode quickly enough
Solution Approach 1:
The patent implements dynamic scanning frequency adjustment based on operational mode. In idle mode, the scanning frequency is reduced to save power, while in activation mode, the scanning frequency is increased to ensure reliable touch detection. The system transitions between these modes based on detected touch events, allowing optimized performance for each operational state.
Solution Approach 2:
The patent segments the touch control scanning process into different modes (idle mode and activation mode) with different scanning frequencies. By dividing the operational states and applying different scanning strategies to each segment, the system achieves both power savings in idle periods and reliable detection during active use.
2Reliability
If the touch control scanning signal is applied continuously in both idle mode and activation mode, then touch detection reliability is maintained, but power consumption cannot be saved effectively
Solution Approach 1:
The patent applies periodic scanning action in idle mode rather than continuous scanning. The scanning is performed at reduced frequency intervals during idle periods, which significantly reduces power consumption while maintaining adequate detection capability. When touch is detected, the system transitions to activation mode with higher scanning frequency.
3Use of energy by moving object
If the scanning interval is increased in idle mode to reduce power consumption, then power consumption is reduced, but the report rate is reduced and fast inputs are missed
Solution Approach 1:
The system dynamically adjusts the scanning interval based on operational state. In idle mode, a longer scanning interval is used to reduce power consumption and improve battery life. When touch input is detected, the system quickly transitions to activation mode with a shorter scanning interval to ensure all inputs are captured at the appropriate reporting rate.
Data Source
AI summary
The present disclosure discloses a control method and a touch display apparatus. The control method includes: dividing one frame into multiple sub-frames, wherein each sub-frame includes a display time period and a touch control time period; performing display scanning on a touch display apparatus in the display time period to display a picture; performing touch scanning on the touch display apparatus in the touch control time period to obtain a touch sensing signal; and obtaining touch sensing data according to the touch sensing signal and detecting touch according to the touch sensing data, wherein performing touch control scanning on the touch display apparatus includes: if no touch is detected in a preset time period, entering a first mode in which the multiple touch sensing channels are short-circuited and one of the multiple touch sensing channels is scanned in the touch control time period of one of the multiple sub-frames.