Patent ID: 8325207

Claim:
A frame rate adjuster, for adjusting a frame rate of a display device according to brightness of a frame, the frame rate adjuster comprising: a frame counting circuit, for receiving the frame and counting a number of received grey level data of the frame to determine if the frame has been completely received, for generating a frame triggering signal; wherein when the frame counting circuit determines the frame has been completely received, the frame counting circuit generates the frame triggering signal representing enable/reset; a brightness counting circuit, for receiving the frame and counting number of the grey level data of the frame within each of brightness intervals, for accordingly generating a plurality of brightness counting numbers corresponding to the brightness intervals; wherein when the frame triggering signal represents enable/reset, the brightness counting circuit resets the plurality of the brightness counting numbers; a brightness determining circuit, for outputting a brightness determining signal according to the frame triggering signal and a highest brightness counting number of the plurality of the brightness counting numbers; wherein when the frame triggering signal represents enable/reset, the brightness determining circuit outputs the brightness determining signal according to the highest brightness counting number of the plurality of the brightness counting numbers; and a frame rate selecting circuit, comprising: a control end, for receiving the brightness determining signal; an enable end, for receiving the frame triggering signal; and an output end, for generating an output frame rate; wherein when the frame triggering signal represents enable/reset, the frame rate selecting circuit selects one of a plurality of reference frame rates to be the output frame rate according to the brightness determining signal, and the output frame rate is utilized as the frame rate of the display device.