Abstract: A display panel drive apparatus which reduces noise to thereby prevent malfunction. A first switch connects based on pixel data between one of column electrodes of a display panel and a power supply line to which a pulsed supply voltage is applied. A second switch connects between the one column electrode and a ground line based on the pixel data. The first and second switches are used to apply pixel data pulses based on the pixel data to the one column electrode. In this scheme, the pixel data having a lower frequency in the vertical direction of the screen allows the second switch to send a smaller current to the ground line when compared with a case of the pixel data having a higher frequency.

Abstract: A display panel drive apparatus which reduces noise to thereby prevent malfunction. A first switch connects based on pixel data between one of column electrodes of a display panel and a power supply line to which a pulsed supply voltage is applied. A second switch connects between the one column electrode and a ground line based on the pixel data. The first and second switches are used to apply pixel data pulses based on the pixel data to the one column electrode. In this scheme, the pixel data having a lower frequency in the vertical direction of the screen allows the second switch to send a smaller current to the ground line when compared with a case of the pixel data having a higher frequency.

Abstract: Disclosed is a drive circuit that allows an improvement of driving capability of switching devices in an output circuit that drives capacitive loads, and allows an improvement in power recovery efficiency. The drive circuit comprises: a second power supply circuit for supplying a second power supply voltage; and a plurality of output control circuits each for individually controlling switching operations of a first switching transistor and a second switching transistor. The second power supply circuit superimposes a DC voltage on a first power supply voltage from an output terminal of a first power supply circuit to generate the second power supply voltage, and supplies the generated voltage to the output control circuits. The first switching transistor selectively supplies an output voltage to its corresponding capacitive load in response to the first switching control signal supplied from its corresponding output control circuit.