Patent ID: 7522148
Filing Date: 2009-04-21
Classification: G09G

Abstract:
1. A source driver for driving a source line included in an electro-optical device, the source driver comprising: an impedance conversion circuit that drives the source line based on a grayscale voltage corresponding to display data; a first switch circuit including one end coupled to a non-display voltage is supplied and another end coupled to an output of the impedance conversion circuit; a power save data holding circuit provided corresponding to each impedance conversion circuit or to impedance conversion circuits corresponding to a plurality of dots making up a pixel, and for holding power save data; and a first mask circuit for masking the power save data based on a first mask control signal that varies in unit of a horizontal scan period, when power save control is performed based on an output from the first mask circuit, an operational current of the impedance conversion circuit is suspended or restricted to set an output of the impedance conversion circuit as a high impedance state and the first switch circuit is set to a conducting state, and when power save control is not performed based on an output from the first mask circuit, the impedance conversion circuit drives the output of the impedance conversion circuit based on the grayscale voltage and the first switch circuit is set to a non-conducting state.