Touch Display Driving Apparatus Fast Scan Mode Doze Latency

The patent implements dynamic scan rate adjustment by transitioning between doze mode (lower scan rate) and normal touch scanning mode (higher scan rate) based on touch event detection. When a touch event is detected in doze mode, the system dynamically switches to normal scanning mode to reduce latency, then can return to doze mode afterward, optimizing both power consumption and responsiveness.

The system changes the scan rate parameter from a fixed low value in doze mode to a higher value in normal mode. This parameter change is triggered by touch event detection, allowing the system to adapt the scanning performance to actual usage conditions, thereby reducing first tap latency while maintaining power efficiency during idle periods.

The system uses periodic scanning at different rates depending on the operational mode. In doze mode, scanning occurs at a lower periodic rate to save power, while in normal mode, scanning occurs at a higher periodic rate to reduce latency. This periodic action with variable frequency allows the system to balance power consumption and responsiveness based on actual needs.

The scan rate is made dynamic rather than static, allowing the system to switch between low-power and high-performance states. This dynamic adjustment ensures that high scan rates are only used when necessary (upon touch event detection), minimizing overall power consumption while reducing latency when needed.