Abstract: An electronic device including a display panel and a CPU is provided. The display panel updates displayed images at a refresh rate. The CPU implements a latency monitor, a system resource controller, a display controller, and an application. The latency monitor collects time information related to touch latency. The touch latency is the duration between the time point at which the display panel detects a touch event and the time point at which the display panel displays an image generated by the application in response to said touch event. The display controller informs the system resource controller of the refresh rate. The system resource controller adjusts the resource allocation of the electronic device to cause the touch latency to be lower than a threshold, according to the time information and the refresh rate.

Abstract: An electronic device is provided. The electronic device includes a display panel and a controller coupled to the display panel. The display panel is configured to update displayed images at a refresh rate. The controller is configured to receive a target frame rate from a first application. The controller is further configured to determine a frame rate according to the refresh rate and the target frame rate. The frame rate is a factor of the refresh rate. The controller is further configured to control the first application to draw images at the frame rate.

Abstract: A frame rate control method is provided. A primary scenario and a non-primary scenario are identified according to two or more windows displayed on a screen. Each of the primary scenario and the non-primary scenario is performed by an individual application. A frame rate of the non-primary scenario is decreased when a performance index indicates that a first condition is present. The application corresponding to the non-primary scenario is disabled when the performance index indicates that a second condition is present after decreasing the frame rate of the non-primary scenario, so as to remove the window corresponding to the non-primary scenario from the screen.