Patent ID: 7911437
Filing Date: 2011-03-22
Classification: G09G

Abstract:
1. A column driver circuit for a graphics display, comprising: an upper amplifier circuit that includes an upper supply terminal arranged to be coupled to an upper power supply, a lower supply terminal coupled to a common node, and an output terminal coupled to a first node, wherein the upper amplifier circuit is arranged to couple the lower supply terminal to the output terminal via an output stage of the upper amplifier circuit during charge share operation of the upper amplifier circuit; a lower amplifier circuit that includes an upper supply terminal coupled to the common node, a lower supply terminal arranged to be coupled to a lower power supply, and an output terminal coupled to a second node, wherein the lower amplifier circuit is arranged to couple the upper supply terminal to the output terminal via an output stage of the lower amplifier circuit during charge share operation of the lower amplifier circuit; and an output switching circuit that includes a first input coupled to the first node, a second input coupled to the second node, a first output coupled to a third node, and a second output coupled to a fourth node; wherein the third node and the fourth node are arranged to be coupled to a first column line and a second column line of the graphics display, respectively; wherein the output switching circuit is arranged to couple the first node and the second node to the third node and the fourth node; and wherein the upper amplifier circuit is responsive to a first charge share control signal and the lower amplifier circuit is responsive to a second charge share control signal that is inversely related to the first charge share control signal such that the charge share operations of the upper and lower amplifier circuits are activated via the first and second charge share control signals, respectively.