Patent ID: 8294736

Claim:
A method for driving a display device that outputs an image based on a video source, said method comprising: carrying out a first gradation converting process with respect to a first gradation level of an inputted video source signal and correcting a tone-luminance characteristic of the inputted video source signal, carrying out a smoothing process with respect to the inputted video source signal which has been subjected to the first gradation converting process; and carrying out a second gradation converting process with respect to a second gradation level of the inputted video source signal which has been subjected to the smoothing process, the carrying out a second gradation converting process is based on a contrast of the display device, wherein O(X 1 )=G 2 (G 1 (X 1 )) is satisfied, where X 1 is the inputted video source signal, O(X 1 ) is a function of luminance of the image to be outputted in response to the inputted video source signal X 1 , G 1 (X 1 ) is a function of the video source signal X 1 which has been subjected to the first gradation converting process, X 3 is the inputted video source signal which has been subjected to the smoothing process, and G 2 (X 3 ) is a function of luminance of the video source signal X 3 which has been subjected to the second gradation converting process, G 2 (X 3 )=K×X 3 3 , K is a constant.