Frequency Dependency of Multi-layer OLED Current Density-voltage Shift and Its Application to Digitally-driven AMOLED

Abstract

We report, for the first time, operation frequency dependence of current density-voltage (JOLED-VOLED) shift for multi-layer organic light-emitting diodes (OLEDs). When the OLEDs were electrically stressed for 21 hours with 50% duty voltage pulses at 60, 120, 240, and 360 Hz, the JOLED-VOLED shifts were suppressed by half for 360 Hz operation compared with 60 Hz operation, but with little change in emission efficiencies. This frequency dependent JOLED-VOLED shift is believed to be commonly observed for typical multi-layer OLEDs and can be used to further improve lifetime of digitally-driven active-matrix OLED displays.

A unified OLED aging model combining three modeling approaches for extending AMOLED lifetime

“…5 This can be identified with AC aging test, in which AC driving can heal the decay in electrical property but not the decay in current efficiency. 8…”