Touch Control Driver Dynamic Scan Frequency Adjustment
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Solution Overview
Problem
Existing touch control technologies face high power consumption, especially when the touch control function is not frequently used, leading to unnecessary energy waste.
Innovation Solution
A touch control driving method and apparatus that dynamically adjusts the scan frequency based on the writing frequency and duration of the RAM, reducing the scan frequency when the user is not actively using the touch control function, such as during video playback, and restoring it upon detection of user input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the touch control scan operates at high frequency continuously, then the touch control detection accuracy is improved, but the power consumption increases significantly
Solution Approach 1:
The patent applies dynamic adjustment of scan frequency based on system state. The touch control driver IC switches between first scan frequency (higher) and second scan frequency (lower) according to whether the display is in display-only mode or touch control mode, resolving the contradiction between maintaining high detection accuracy and reducing power consumption during idle periods
Solution Approach 2:
The patent changes the operational parameter (scan frequency) of the touch control driver IC based on detection results. When the display buffer is full and no touch control is needed, the scan frequency is reduced from the first frequency to the second frequency, thereby reducing power consumption while maintaining the ability to detect touch input when needed
2Use of energy by moving object
If the touch control scan frequency is reduced to save power, then the power consumption decreases, but the touch control detection responsiveness deteriorates
Solution Approach 1:
The system dynamically switches between two scan frequency states based on operational mode. When touch control functionality is required, the system transitions to the first (higher) scan frequency to ensure responsive detection, while switching to the second (lower) frequency only during display-only periods when responsiveness is not required
Solution Approach 2:
The touch control driver IC continuously monitors the state of the display buffer and determines whether touch control operations are needed. This feedback mechanism ensures that the scan frequency is adjusted appropriately - maintaining high frequency when touch detection is needed and reducing it when not needed, thus balancing power consumption and responsiveness
Data Source
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AI summary
The embodiments of the present disclosure provide a touch control driving method, a touch control driving apparatus and a touch control display device, capable of reducing power consumption of a touch screen. The method comprises: inputting a touch control driving signal at a first scan frequency for touch control scan; detecting a writing frequency of a Random Access Memory (RAM) and a duration for the writing frequency; and reducing the first scan frequency to a second scan frequency when the writing frequency of the RAM is larger than or equal to a first threshold and the duration for the writing frequency is larger than or equal to a second threshold. The method can be applied in a process of touch control driving.