Patent attributes
Devices and techniques for individual control of multiple light emitting diodes (LEDs) in a LED array. A LED array may include multiple strands of LEDs with each strand including a single LED or multiple LEDs. The techniques of this disclosure include a parallel approach to controlling a LED array with a current measurement circuit in each LED strand. The current measurement circuits may be selectable by a controller via a multiplexer (MUX). The arrangement of circuit elements provides for an improved initialization phase and operating phase and may achieve an accurate and substantially equal current at all LEDs. The current control may ensure a homogenous light output that accounts for process and production variability, as well as changes in operating conditions. A LED control circuit of this disclosure may also include system safety features including temperatures sensing, and over voltage and over current sensing and protection.