Common voltage generation circuit, power supply circuit, display driver, and common voltage generation method

摘要

A common voltage generation circuit includes a first operational amplifier which outputs an amplitude voltage of a common voltage based on a first power supply voltage, a second operational amplifier which outputs a high-potential-side voltage of the common voltage based on the first power supply voltage, and a low-potential-side voltage generation circuit which generates a low-potential-side voltage of the common voltage which is lower in potential than the high-potential-side voltage for the amplitude voltage by a charge-pump operation. The common voltage generation circuit supplies the high-potential-side voltage or the low-potential-side voltage to a common electrode which faces a pixel electrode specified by a scan line and a data line of an electro-optical device through an electro-optical substance.