Unlike Active Matrix OLEDs (AMOLED), Passive Matrix OLEDs (PMOLED) do not have thin-film transistors for activation. The individual electrodes of PMOLEDs - the anode, the organic layer and the cathode - are arranged in rows in
the form of strips, with the rows of the anodes at right angles to those of the cathodes. The control can be done via the cathode and anode lines, whereby the Organic Light Emitting Diode (OLED), which is located at the intersection of the anode and cathode lines, is activated and emits light. The brightness depends on the injected current
.periods of time and emit light. Thus, the overall brightness control is dependent on the row activation time and the pulse duration
at the anode.