CURRENT DRIVER FOR AN ARRAY OF LED DIODES

摘要

An array of LED diodes includes N channels each having LEDs coupled in series with a switch. A current driver for the array includes a processing circuit configured to detect N currents flowing respectively through the N channels of the array. The detected currents are converted by a single analog to digital converter, one at a time, into a digital word. The circuit further includes N comparator devices configured to control the N switches as result of a comparison between the digital words and respective target digital words. A memory is provided for storing the digital words received from the analog to digital converter.

主权项

1. A current driver device for an array of LED diodes, the array including N channels each one comprising a plurality of LED diodes and a switch arranged in the electric path between the plurality of LED diodes and a common voltage reference, the current driver comprising:
a processing circuit configured to detect N currents flowing respectively through the N channels of said array of LED diodes and convert each detected current into a digital word, N comparator devices configured to control said N switches as result of a comparison between said digital words and respective target digital words, wherein said processing circuit comprises one analog to digital converter configured to convert one at a time the N detected currents into said digital words, and wherein said processing circuit further comprises a memory configured to store said digital words received from the analog to digital converter.