An LED display panel contains an LED array having a plurality of LED pixels, a plurality of scan switches, and a plurality of LED columns. The anode of each LED pixel in each LED column is connected to a common anode node and the common anode node is connected to an output of a current source, while the cathode of each LED pixel in each LED column is switchably connected to a current sink via one of the plurality of scan switches. The common anode node is connected to a first input of a comparator circuit and is switchably connected to an anode voltage source. The second input of the comparator circuit is connected to a reference voltage source and an output of the comparator circuit signally controls a switch member that switchably connects the common anode node to the current sink.