Premium
55.1: Invited Paper : Organic Vapor Jet MicroPrinting of OLED Displays and Lighting Panels
Author(s) -
Forrest Stephen R.,
McGraw Gregory J.
Publication year - 2013
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1002/j.2168-0159.2013.tb06325.x
Subject(s) - citation , library science , science and engineering , computer science and engineering , engineering physics , engineering , computer science , engineering ethics , software engineering
Three primary factors govern the cost and performance of organic light emitting diode (OLED) displays that are gaining widespread acceptance for use in mobile electronic appliances. The emitting devices must be of very high efficiency. For this purpose, nearly 100% internally efficient small molecule electrophosphorescent OLEDs (PHOLEDs) are almost universally used for red, and soon for green emission. The second factor is the transistor “backplane” based primarily on low temperature poly-Si transistor technology, soon to be replaced with metal oxide transistors due to their cost and processing advantages. The last factor forming the “three-legged stool” supporting the widespread use of OLED in large televisions and monitors, is a low cost, fast and high resolution means for pixel patterning. To achieve these metrics, optimal processing methods should combine film growth and patterning into a single step. Practical techniques must be capable of rapid, high resolution patterning, and must also be compatible with high efficiency PHOLED architectures. Finally, the technique must be scalable to Gen 8 substrates and beyond. The most commonly used method is vacuum thermal evaporation using thin metal shadow masks, or alternatively, “scanning shadow masks”. However, such masks are susceptible to clogging and are difficult to precisely position over large areas.