Patent ID: 9013118
Filing Date: 2015-04-21
Classification: H05B

Abstract:
1. A light-emitting diode (LED) control system comprising: an LED driver system configured to regulate a control voltage based on a substantially constant reference current and a feedback voltage at a feedback node; a digital current source system comprising a plurality of unit current sources that are each coupled to an LED, the plurality of unit current sources being selectively activated to each provide a given unit current through the LED and to each provide the feedback voltage as an interpolative feedback to the feedback node based on the unit current; and a current magnitude controller configured to selectively activate the plurality of unit current sources in response to a current magnitude signal, wherein the plurality of unit current sources are arranged in a two-dimensional array comprising a plurality of rows and a plurality of columns, each of the plurality of rows comprising a first quantity of the plurality of unit current sources and each of the plurality of columns comprising a second quantity of the plurality of unit current sources.