Patent ID: 7142200

Claim:
A driving method for a display device having a display panel in which pixel lines each of which includes a plurality of pixels arranged in a first direction are juxtaposed in a second direction transverse to the first direction and at least one source driver supplying an image signal to each pixel belonging to one of the pixel lines being selected are arranged, and a display control circuit supplying parallel data and a clock supplied to the source driver, comprising: a first step for generating dummy data as the parallel data having waveform varying with respect to each of the plurality of pixels contained in one of the pixel lines and for making the source driver acquire the dummy data; and a second step for converting the dummy data acquired in the source driver to serial data, sending the serial data to the display control circuit, converting the serial data to reference data in a parallel form in the display control circuit, and comparing the reference data with the dummy data, wherein the delay time of the clock to the parallel data is adjusted to be extended in the second step if waveform variation of the reference data is different from that of the dummy data.