Driving method of display device

A driving method of a display device comprising a display controller and a display panel provided with first to m-th signal lines, first to n-th scan lines, and a plurality of pixels arranged at intersection points of the scan lines and the signal lines, the display controller comprising the steps of:

• calculating a first absolute value of a difference value between first display data and second display data and a second absolute value of a difference value between third display data and fourth display data, wherein the first display data is displayed in a first pixel connected to one of the signal lines and (j−1)-th scan line (j is greater than or equal to 2 and less than or equal to n), the second display data is displayed in a second pixel connected to the one of the signal lines and j-th scan line, the third display data is displayed in a third pixel connected to another of the signal lines and the (j−1)-th scan line, and the fourth display data is displayed in a fourth pixel connected to the another of the signal lines and the j-th scan line;
• extracting a maximum value from the first absolute value and the second absolute value;
• determining a first selection period of the j-th scan line in accordance with the maximum value,
• from results of a plurality of absolute values, determining that the first display data is the same as the second display data;
• concurrently selecting the (j−1)-th scan line and the j-th scan line after determining that the first display data is the same as the second display data;
• and
• concurrently updating the first pixel and the second pixel with the first display data, wherein the first pixel and the second pixel are connected to the one of the signal lines.