Patent ID: 8004510

Claim:
A control circuit of a display device comprising: first to sixth video data storage portions; a video data format conversion portion for writing a first video data in the first video data storage portion, writing a second video data in the second video data storage portion, writing a third video data in the third video data storage portion, writing a fourth video data in the fourth video data storage portion, writing a fifth video data in the fifth video data storage portion and writing a sixth video data in the sixth video data storage portion; a selection means for alternating between writing of the first video data and the second video data in the first video data storage portion and the second video data storage portion, and writing of the third video data and the fourth video data in the third video data storage portion and the fourth video data storage portion every one frame period; and a display control portion for alternating between reading of the first video data the second video data from the first video data storage portion and the second video data storage portion, and reading of the third video data and the fourth video data from the third video data storage portion and the fourth video data storage portion every one frame period, wherein the writing of the first video data and the second video data in the first video data storage portion and the second video data storage portion, and the writing of the third video data and the fourth video data in the third video data storage portion and the fourth video data storage portion are each sequentially carried out in one frame period, wherein the writing of the first video data and the second video data and the reading of the first video data and the second video data are alternately carried out, wherein the writing of the third video data and the fourth video data and the reading of the third video data and the fourth video data are alternately carried out, and wherein the fifth video data and the sixth video data are read from the fifth video data storage portion and the sixth video data storage portion by the display control portion during a retrace period.