Patent ID: 7956833
Filing Date: 2011-06-07
Classification: G09G

Abstract:
1. A display driver for driving an electro-optical device, the display driver comprising: a common electrode charge storage switch provided between a first capacitor element connection node to which one end of a first capacitor element can be connected and a common electrode voltage output node to which a voltage of a common electrode opposite to a pixel electrode of the electro-optical device through an electro-optical material is supplied; a source charge storage switch provided between a second capacitor element connection node to which one end of a second capacitor element can be connected and a source voltage output node to which a voltage of a source line of the electro-optical device is supplied; and a node short circuit switch provided between the common electrode voltage output node and the source voltage output node, the display driver selecting one of a first operation mode and a second operation mode and carrying out the first operation mode or the second operation mode, in the first operation mode, after setting the node short circuit switch in a conducting state while setting the common electrode charge storage switch and the source charge storage switch in a nonconducting state during a first part of the first operation mode, the common electrode being driven during a second part of the first operation mode by supplying the common electrode voltage to the common electrode voltage output node and the source line being driven by supplying a voltage corresponding to a display data to the source line through an output buffer when the common electrode charge storage switch and the source charge storage switch remain in the nonconducting state and the node short circuit switch is set in a nonconducting state, the first part and the second part of the first operation mode being consecutively performed and consecutively repeated, and in the second operation mode, after electrically connecting the common electrode voltage output node and the first capacitor element connection node using the common electrode charge storage switch and electrically connecting the source voltage output node and the second capacitor element connection node using the source charge storage switch while the node short circuit switch is set in the nonconducting state during a first part of the second operation mode, the common electrode being driven during a second part of the second operation mode by supplying the common electrode voltage to the common electrode voltage output node and the source line being driven by supplying the voltage corresponding to the display data to the source line through the output buffer when the node short circuit switch remains in the nonconducting state, the common electrode voltage output node and the first capacitor element connection node are electrically disconnected using the common electrode charge storage switch, and the source voltage output node and the second capacitor element connection node are electrically disconnected using the source charge storage switch, the first part and the second part of the second operation mode being consecutively performed and consecutively repeated.