To provide a display system having plural pixels such as an image display system of a computer with a power saving control function operated with lower power consumption.

The display data DDATA by one horizontal synchronizing period are stored in a storage part 21, and the display data of n-th row are compared with the display data of n+1-th row in a judgement part 22, and when both are the same, a comparison signal NE is made 'L', and when they are different, the comparison signal NE is made 'H'. When the comparison signal NE is 'H', the display data ADATA converted to analog data by a D/A converter 25 are transmitted to a display part 14, and when the comparison signal NE is 'L', the display data ADATA aren't transmitted to the display part 14.