Patent ID: 7864147
Filing Date: 2011-01-04
Classification: G09G,H03K

Abstract:
1. A capacitive load drive unit, comprising: a first power supply circuit arranged to generate a first power supply potential; a second power supply circuit arranged to generate a second power supply potential lower than said first power supply potential; a third power supply circuit arranged to generate a third intermediate power supply potential between said first and second power supply potentials; a capacitive load, one end of which is connected to a reference potential; a first switch arranged to open and close between an output end of said first power supply circuit and another end of the capacitive load; a second switch arranged to open and close between an output end of said second power supply circuit and said another end of the capacitive load; and a third switch arranged to open and close between an output end of said third power supply circuit and said another end of the capacitive load; wherein when a potential applied to said another end of the capacitive load is switched from said first power supply potential to said second power supply potential, the switching proceeds by transitioning when the potential applied to said another end of the capacitive load is switched from said second power supply potential to said first power supply potential, the switching proceeds by transitioning