Power supply circuit, voltage conversion circuit, semiconductor device, display device, display panel, and electronic equipment

• Main Author: Ishiyama, Hisanobu
• Format: Patent
• Language: English
• Published: 17.04.2007

A power supply circuit which generates a power supply for a circuit which drives a source electrode and a gate electrode provided in a display, includes a first booster circuit which outputs a third potential boosted based on a difference between first and second potentials, a potential regulator circuit which outputs a fourth potential being a constant potential generated based on a difference between the first and third potentials, and a second booster circuit which outputs a fifth potential boosted based on a difference between the first and fourth potentials. The first and fourth potentials are supplied to a source electrode driver circuit, and the first and fifth potentials are supplied to a gate electrode driver circuit. A voltage supplied to the gate electrode driver circuit may be generated by using a voltage conversion circuit. The voltage conversion circuit includes a capacitor which capacitively couples a sixth power supply line to which a negative constant potential based on a first potential is supplied and a node to which a polarity inversion timing signal of a common electrode is supplied, a negative power supply generating circuit which generates a negative output potential based on a booster potential which is the difference between a regulating potential and the first potential, and a switching element connected between the negative power supply generating circuit and the sixth power supply line. A timing signal and a switching control signal of the switching element change in synchronization with each other.