Patent ID: 8040939

Claim:
A picture mode controller comprising: an input unit to input a data enable signal indicating transmission sections for pixel data, and a clock signal indicating a transmission time of each pixel data; a signal recovering unit for recovering the data enable signal to be comprise an enable period corresponding to original resolution and generating a recovered data enable signal; a pseudo enable signal generating unit to generate a pseudo data enable signal to be used as the data enable signal; a first selecting unit to selectively output the recovered data enable signal and the pseudo data enable signal to allow one of a video picture mode and a black picture mode to be designated; and a selection control unit to control a selecting operation of the first selecting unit based on whether the data enable signal is input from the input unit and whether a period of the clock signal changes, wherein the selection control unit controls the first selecting unit to output the recovered data enable signal when the data enable signal is received and the clock signal maintains a constant period, wherein the selection control unit comprises a no signal detector to detect whether the data enable signal is received from the input unit and an abnormal signal detector to detect whether a period of the clock signal changes, and supply a detecting results to the first selecting unit, wherein the no signal detector includes a logic element for performing an OR operation on signals output from the no signal detector and the abnormal signal detector.