Patent ID: 7274342

Claim:
A drive circuit for a matrix type display device for applying predetermined voltage to a capacitive load being a display, comprising: a first signal line for supplying a potential to one terminal of the capacitive load; a first switch element for supplying a first potential to said first signal line; a first drive circuit for driving said first switch element; a second switch element for supplying a third potential to said first signal line; a second signal line for supplying a second potential different from the first potential to the one terminal of the capacitive load; a first capacitor connected between said first signal line and said second signal line and capable of supplying a lower potential than the first and the third potentials to said first signal line; a third switch element for supplying the third potential to said second signal line; a fourth switch element for connecting said first signal line to the one terminal of the capacitive load; a fifth switch element for connecting said second signal line to the one terminal of the capacitive load; a coil circuit connected between at least one of said first signal line and said second signal line, and a supply line for supplying the third potential; and a floating power supply circuit for supplying power supply voltage with potential of said first signal line as a reference to said first drive circuit.