Information is communicated between an RFID tag and first and second readers. In the driving method, a first current is provided to flow through an OLED of a pixel in a first period of one display period, according to a video signal on the data electrode and a scan signal on the scan electrode. A terminal return current, or composite upstream current, is derived from the one or more current measurements. In the exemplary context of a plurality of interconnected serial bus devices, the invention enables a device to draw more current than that required to be reserved for that device, yet without increasing the total amount of power which must be dedicated to the serial ports as a whole. Each of the absorbent articles has a thickness and is individually wrapped in a wrapper.