Patent ID: 7554073
Filing Date: 2009-06-30
Classification: G01J

Abstract:
1. A battery-operated mobile device, comprising: a backlit display having a power level adjustable in accordance with an output signal, the output signal being representative of an ambient light intensity, the power level being adjustable such that the backlit display is visible by a user as the ambient light intensity varies; a light sensor configured to measure the ambient light intensity and provide the output signal to an external circuit operably connected to the backlit display and configured to vary the power level of the backlit display in accordance with the output signal, the light sensor comprising; wherein the first photodectector, the second photodetector, the node and the cascode current mirror amplifier circuit are further configured in respect of one another to compensate for non-linearities associated with the dark current while not amplifying the dark current and noise associated therewith.