The present invention provides an electronic device including a receiving circuit, a buffer, an output circuit and a control circuit. The receiving circuit is configured to receive input image data. The buffer is configured to temporarily store the input image data. The output circuit is configured to read the input image data from the buffer to generate output image data. The control circuit is configured to the generate a control signal according to a bit depth of the input image data, to dynamically control a delay time for the output circuit to generate the output image data.