Patent ID: 7920119

Claim:
An electro-optical apparatus drive circuit used for driving an electro-optical apparatus including a plurality of data lines and a plurality of scanning lines extending with intersecting each other, and a plurality of pixel parts electrically connected to the data lines and the scanning lines individually, the drive circuit comprising: a scanning-line drive part for supplying scanning signals to the plurality of scanning lines; and a data-line drive part for supplying an image signal to the plurality of data lines, wherein at least one of the scanning-line drive part and the data-line drive part includes a shift register for outputting transfer signals from a plurality of stages individually in sequence based on a clock signal having a predetermined cycle, a set of first enable supply lines for supplying a plurality of series of first enable signals having a first pulse width smaller than a pulse of the transfer signals output from the plurality of stages, a single second enable supply line for supplying a single series of a second enable signal having a second pulse width smaller than the first pulse width, and pulse width restricting circuits for restricting the pulse width of the transfer signals to the first pulse width by receiving input of the transfer signals, the first and the second enable signals, and shaping each pulse of the input transfer signals based on the plurality of series of individual first enable signals, and for restricting the pulse width of the transfer signals to the second pulse width by shaping pulses of the transfer signals after being restricted to the first pulse width based on the one series of the second enable signal, wherein the pulse-width restricting circuits perform shaping of all the pulses of the transfer signals after being restricted to the first pulse width based on the one series of the second enable signal, wherein the pulse width restricting circuits comprises a logical circuit for restricting the pulse width of the transfer signals to the first pulse width by performing an AND operation between the transfer signals and the first enable signals, and restricting the pulse width of the transfer signals after being restricted to the first pulse width to the second pulse width by performing an AND operation between a signal based on the operation result of the AND operation and the second enable signal and wherein an OR operation is performed on the transfer signals after being restricted to the first pulse width and a precharge signal.