Patent ID: 7330163

Claim:
An apparatus for driving a plurality of display units, each including a plurality of data lines, a plurality of scan lines and a plurality of pixels each provided at one of said data lines and one of said scan lines, the apparatus comprising: at least one of a common data driver circuit and a common scan driver circuit, said common data driver circuit including a plurality of first switch groups, each first switch group being connected to the data lines of one of said display units for driving the data lines of said one of said display units, said common scan driver circuit including a plurality of second switch groups, each second switch group being connected to the scan lines of one of said display units for driving the scan lines of said one of said display units, wherein said common data driver circuit comprises: a plurality of frame memories for storing video signals, each for one of said display units; a plurality of third switch groups each group being connected to one of said frame memories and being operated in synchronization with operations of said first switch groups; a line memory, connected to said third switch groups, for selectively storing one line data of said frame memories in accordance with the operations of said third switch groups; a gradation voltage generating circuit; a decoder circuit, connected to said line memory and said gradation voltage generating circuit, for selecting gradation voltages from said gradation voltage generating circuit in accordance with output signals of said line memory; and an output circuit, connected between said decoder circuit and said first switch groups, for transmitting said selected gradation voltages to said first switch groups, so that said selected gradation voltages are transmitted to the data lines of one of said display units in accordance with the operations of said first switch groups.