Abstract
The organic light-emitting diode (OLED) offers thin, lightweight and better color quality of display. The rapid improvement in efficiency has led the OLED into display applications. There are two types of OLED display: passive matrix OLED (PMOLED) display, which only displays still images or signs; and active matrix OLED (AMOLED), which can display video frequency images such as TVs. Light emitting from the OLEDs involves some processes, such as injection of holes and electrons, transport of holes and electrons into the emitting layer, and combination of the holes and electrons into excitons. Soluble small molecular materials enable high throughput and low cost roll-to-roll or inkjet printing process to be used for making OLED display and lighting panels. As for the printing methods, many printing processes, such as inkjet printing and roll-to-roll printing such as gravure, flexographic, gravure offset or slot die are all applicable to printing OLEDs.
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