Display device and driving method thereof
View Patent ↗In a display device comprising a display panel driven in an active matrix scheme, a display control circuit generating image data and clock, and at least one source driver acquiring the image data in response to the clock and supplying image signals based on the image data to the display panel, the present invention generates dummy data in stead of the image data, makes the at least one source driver acquire the dummy data, reads out the dummy data acquired by the at least one source driver, compares the dummy data read out from the at least one source driver with the dummy data in an original state, and adjust delay time of the clock to the image signal in accordance with the comparison result, so as to reduce flicker in an image displayed by the display device due to timing difference between the image data and the clock.
1. 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.
2. A driving method for a display device according to claim 1 , wherein the dummy data are generated again in the second step to be compared with the reference data in the second step.
3. A driving method for a display device according to claim 1 , wherein the dummy data are acquired by the source driver in response to the clock.
4. A driving method for a display device according to claim 3 , further comprising:
a third step for generating the dummy data again and for making the source driver acquire the dummy data in response to the clock having the delay time adjusted in the second step; and
a fourth step for converting the dummy data acquired in the source driver in the third step 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 generated in the fourth step.
5. A driving method for a display device according to claim 4 , wherein the delay time of the clock to the parallel data is adjusted to be extended in the fourth step if waveform variation of the reference data is different from that of the dummy data in the fourth step.
6. A driving method for a display device according to claim 5 , wherein the third step and the fourth step are repeated if the waveform variation of the reference data is different from that of the dummy data in the fourth step, and
the dummy data acquisition performed by the source driver in the third step is based on the clock having the delay time adjusted in the other fourth step prior to the third step.
7. A driving method for a display device according to claim 1 , wherein the first step is started by powering the display device.
8. A driving method for a display device according to claim 1 , wherein the dummy data are generated irrespective of image information inputted to the display device.