1. A LED driving system for a LED matrix having a plurality of LEDs connected in parallel, comprising:a plurality of driving modules, wherein each one of the plurality of driving modules is configured to drive a corresponding one of the plurality of LEDs; and wherein
each one of the plurality of driving modules comprises:
a local current driver having a driver input terminal configured to receive a reference current and a driver output terminal configured to provide a driving current to the corresponding one LED; and
a local current tuning module having a U-bit input terminal configured to receive a U-bit current tuning command comprising U bits, wherein U is a positive integer, and wherein the local current tuning module is configured to tune the driving current for the corresponding one LED to reach a desired driving current using the U-bit current tuning command providing a predetermined number of tuning steps, and wherein the predetermined number ranges from 0 to 2U.