Patent ID: 8004490

Claim:
An active-matrix bistable display device having a memory property comprising: a display panel in which (N/X)M pixel electrodes are formed at intersection of N scanning lines extending in a row direction and of M signal lines extending in a column direction, whereby an N/X by M matrix of pixels is formed (N, M, X and N/X each are an integer being two or more) and a display state of each of the pixel electrodes changes depending on a voltage of each of the pixel electrodes; a signal-line driving unit in which the M signal lines are sequentially divided into M/X signal line groups each comprising X signal lines, and the X signal lines making up each signal line group are connected to each other, and the MIX signal line groups are connected to M/X terminals of the signal-line driving unit in a one-to-one relationship and image inputs corresponding to the M signal lines are sequentially divided into M/X image input groups each comprising X image inputs and X image signals making up each image input group are supplied sequentially to the M/X terminals in a time-division manner; and a scanning-line driving unit in which the N scanning lines are sequentially divided into N/X scanning line groups each comprising X scanning lines, and the X scanning lines are sequentially driven in each of the N/X scanning line groups, wherein each row of M pixel electrodes of the N/X by M matrix of pixels are divided into X pixel electrode groups, and each of the X pixel electrode groups comprises M/X pixel electrodes which are separately placed at every X pixel electrodes in the row direction, and each of the X scanning lines making up each scanning line group is connected to M/X pixel electrodes among a row of M pixel electrodes corresponding to the each scanning line group, the X scanning lines and the X pixel electrode groups corresponding in a one-to-one relationship; wherein each of switching elements connected between each of the corresponding signal lines and each of the corresponding scanning lines is made active in response to driving of each of said scanning lines so as to supply an image voltage to each of the pixel electrodes so that bistable display having the memory property in said display panel is performed according to a polarity of said image voltage.