Patent ID: 6924824

Claim:
A method of driving an active matrix display device wherein one image frame comprises a plurality of sub-frames each having a sub-frame period comprising a write time and a hold time, and a gray scale image is displayed on the device by the cumulative effects of the hold times, the method comprising: simultaneously with outputting a signal via each of signal lines, the value of the level of the signal being selected from values of a plurality of signal levels in accordance with digital image data, the number of signal levels being fewer than the number of gray scales, randomly scanning scan lines, other than one predetermined scan line, in a predetermined sequence during the hold time of each of the sub-frames corresponding to the one predetermined scan line so that any one sub-frame is not written to any one scan line more than once; wherein one image frame period is such that in each scan line, the writing of each of the plurality of sub-frames occurs and the hold time of each of sub-frames of said one image frame period is sufficiently long enough to permit gray scale display driving.