Patent ID: 7649520

Claim:
A driving method of a display device comprising a first gate signal line driver circuit, a second gate signal line driver circuit, a source signal line driver circuit and a pixel portion comprising a plurality of first gate signal lines electrically connected to the first gate signal line driver circuit, a plurality of second gate signal lines electrically connected to the second gate signal line driver circuit, and intersecting with the plurality of first gate signal lines, and a plurality of source signal lines electrically connected to the source signal line driver circuit, and intersecting with the plurality of first gate signal lines, the driving method comprising: selecting all of the plurality of second gate signal lines by the second gate signal line driver circuit when a first image is displayed; outputting sampling pulse from the source signal line driver circuit in a horizontal period, selecting one of the plurality of second gate signal lines by the second gate signal line driver circuit when the sampling pulse is outputted, and selecting one of the plurality of first gate signal lines by the first gate signal line driver circuit in a dot sampling period when a second image is displayed, wherein the second image has a display direction rotated by 90° with respect the first image.