Patent ID: 7053876

Claim:
A flat panel display device comprising: an array substrate including: a plurality of scanning lines and a plurality of signal lines crossing each other to form a cross-wired matrix; a pixel electrode provided so as to correspond to each lattice in the matrix; a pixel-switching element that allows moving image data supplied to the signal line to be written to the pixel electrode in response to a scanning signal supplied to the scanning line; a digital memory which latches still image data; and a switch circuit that inverts a polarity of still image data and retrieves the still image data from the digital memory; an opposing substrate having a common electrode being disposed facing the pixel electrode; a display layer held between the array substrate and the opposing substrate; and a control circuit configured to allow moving image data to be written to the pixel electrode during typical display operation and at the time of switching from a typical display to a still image display, assign as write frames at least initial two frames following the completion of the switching in order to allow still image data to be written to the digital memory, and further, to allow still image data latched in the digital memory to be written to the pixel electrode during still image display operation, wherein the device is further constructed such that at least one of the rise times of a memory control signal supplied to the switch circuit and a common signal supplied to the common electrode is made longer than a vertical blanking period immediately following the completion of the typical display.