Patent ID: 8115755
Filing Date: 2012-02-14
Classification: G06F,G09G,Y02D

Abstract:
1. A method for reducing power consumed by a device within a system that is used to drive or otherwise control a display, where an output from the device transitions from one output level to another in response to a corresponding input to the device transitioning from one input level to another, the method comprising: receiving a control signal that specifies when the input to the device is to transition from one input level to another, in response to which the corresponding output of the device will transition from one output level to another, wherein the control signal selects between at least two input levels, wherein the input to the device will transition from one input level to another when a change in the control signal changes which of the at least two input levels is selected, and wherein after the input to the device has transitioned the input to the device will not transition again for a period of time; using XOR logic producing, based on the control signal and a delayed version of the control signal, a pulsed signal having a leading edge that generally coincides with the input to the device transitioning from one level to another and a trailing edge that occurs a predetermined delay after the leading edge, where the predetermined delay is defined by a delay between the control signal and the delayed version of the control signal; providing a first bias current level to the device when a change in the control signal changes which of the at least two input levels is selected and thereby specifies that the input to, and the corresponding output from, the device are to transition; after providing the first bias current level to the device, before a next change in the control signal, providing a second bias current level to the device after the input to and the corresponding output from the device have already transitioned and are not to transition again for the period of time, the second bias current level being lower than the first bias current level; using the leading edge of the pulsed signal to specify when the bias current provided to the device is to transition from the first bias current level to the second bias current level; and using the trailing edge of the pulsed signal to specify when the bias current provided to the device is to transition from the second bias current level to the first bias current level.