LED forward current errors induced in video display tile's PCB

LED video display smallest module is tile. Common LEDs intensity has to be used in order to match the neighboring tiles and manage white balance. This control is established by common resistor. But large currents present on LED tile distort the common source influence on individual LED drivers. This article is presenting the research conducted in order to evaluate the PCB currents influence on single LEDs currents. The investigation has shown that there is an influence of the high current on the individual LEDs forward current errors. Nevertheless, errors are quite small: maximum average driver current deviation was 4.7 %.