Patent ID: 8390613

Claim:
A display driver integrated circuit comprising: a display driver integrated circuit control unit configured to generate a screen display sync signal by using a main clock signal from an external source when an external image is a moving image, and configured to generate a screen display sync signal by using an internal clock signal when the external image is a still image, and wherein, if the external image changes from the moving image to the still image, a cut-off command signal is received and then at a time when an image is not displayed, in response to a cut-off signal generated after receiving the cut-off command signal, the screen display sync signal is changed from the main clock signal to the internal clock signal and the main clock signal is cut off, and if the external image changes from the still image to the moving image, an apply command signal and the main clock signal is received and then at a time when an image is not displayed, in response to a cut-off signal generated after receiving the apply command signal, the screen display sync signal is changed from the internal clock signal to the main clock signal and generating of the internal clock signal is stopped.