Touch Drive Module Synchronization With Vertical Sync Signal
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Solution Overview
Problem
Existing terminal devices consume excessive power due to high report rates of touch control components, leading to frequent task suspensions, position information collection, and task restarts.
Innovation Solution
The proposed solution involves determining the reporting frequency of position information based on the vertical synchronization signal, ensuring that position information is reported once per signal interval, thereby matching the image update frequency and reducing unnecessary task interruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the touch control component uses a high report rate to collect and report position information frequently, then the response speed and accuracy of touch operations are improved, but the power consumption of the terminal device increases significantly
Solution Approach 1:
The patent applies periodic action by synchronizing touch position information reporting with the vertical synchronization signal of the display. Instead of continuous high-frequency reporting, the system reports position information periodically at intervals matching the display refresh rate (e.g., 60Hz or 90Hz), which maintains responsive touch control while dramatically reducing power consumption by eliminating unnecessary frequent reporting cycles
2Speed
If the application layer or control layer frequently suspends and restarts tasks to process touch position information, then the touch control responsiveness is maintained, but the processing efficiency and power consumption are negatively affected
Solution Approach 1:
The patent applies preliminary action by pre-synchronizing the touch reporting frequency with the display's vertical synchronization signal before processing begins. This ensures that position information is reported at optimal intervals from the start, eliminating the need for frequent task suspensions and restarts, thereby maintaining responsiveness while improving processing efficiency and reducing power consumption
3Stability of the object's composition
If the touch control component reports position information at a high frequency, then the uniformity of reporting points is improved, but the number of task interruptions and power consumption increase
Solution Approach 1:
The patent achieves uniformity of reporting points through periodic action by aligning position information reporting with the display's vertical synchronization signal. This ensures that position data is reported at regular, evenly-spaced intervals corresponding to each display refresh cycle, maintaining uniformity while reducing the overall number of reports and associated power consumption compared to continuous high-frequency reporting
Data Source
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AI summary
A touch control method is applied to a touch drive module of a terminal device. The terminal device includes an application processor and a display drive module. A vertical synchronization signal is received. Position information corresponding to a touch operation is collected. A reporting frequency of the position information is determined based on the vertical synchronization signal, such that the position information is reported once in one signal interval. The signal interval is an interval between two adjacent vertical synchronization signals. The position information is reported to the application processor based on the reporting frequency. By matching the reporting frequency of the position information with the vertical synchronization signal, the position information is reported once within one signal interval, such that the report rate is lowered, the uniformity of reporting is ensured, interrupted steps of the application processor are decreased, and the power consumption of the terminal device is reduced.