Patent ID: 6300797
Filing Date: 2001-10-09
Classification: G09G

Abstract:
A semiconductor device including a drive circuit, a drive control circuit which controls the drive circuit, and a power supply circuit which supplies a potential to the drive circuit and drive control circuit,wherein the power supply circuit comprises:a boosting circuit, to which a first power supply potential which is a ground potential from an external power supply and a second power supply potential which is a potential other than the ground potential are supplied, and raising the absolute value of the second power supply potential and charging the boosted potential to the capacitor; anda bias generating circuit generating a potential supplied to the drive circuit and the drive control circuit based on the output potential of the boosting circuit, andwherein the first power supply potential and a potential from the bias generating circuit are supplied to the drive circuit that outputs a potential selected from potentials supplied in accordance with a control of the drive control circuit during a normal power supply period, and, in the event of a power supply emergency in which an absolute value between the first and the second power supply potentials is lower than a given value, changes all potentials outputted from the drive circuit into the first power supply potential based on the signal activated in the event of the power supply emergency.