Wednesday, January 16, 2008
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OLED Display Technology:
This talk will discuss a unique manufacturing process utilizing solution processing of small molecule materials for OLED displays and a material set including DuPont™ HIL hole injection layer and DuPont light emitting and charge transport materials – the essential materials used to make an OLED display.
The OLED displays industry is under constant pressure to reduce manufacturing costs in order to compete with LCDs, This process should have the ability to overcome the cost barriers the industry has been facing.
We have measured accelerated lifetimes of the three primary colors that could translate in a display to 20,000 hours of white lifetime (which is extended by as much as 5 times when showing video) at a normal viewing brightness (200 cd/m2). At 1,000 cd/m2— the standard test luminance used in the industry — the DuPont materials have lifetimes (T50) of 14,000 hours for blue with CIE 1931 color coordinates of (0.14, 0.16), 230,000 hours for green with color coordinates of (0.29, 0.65), and 46,000 hours for red with color coordinates of (0.66, 0.34). In a review of widely available reports, these are the longest measured lifetimes for a solution material set with equivalent color coordinates.
The OLED materials are printed onto active-matrix thin-film transistor (TFT) backplanes supplied by leading TFT providers, and then protected from environmental degradation with encapsulation technology.
Johann Trujillo is manager of the test engineering group of DuPont
Displays, a subsidiary of DuPont based in Santa Barbara, Calif. He has
held this role since 2001, developing test systems as well as providing
failure analysis and performance testing capabilities. Prior to joining
DuPont Displays, Dr. Trujillo worked at Motorola where he developed
field emission displays.
Dr. Trujillo received his bachelor's degree in chemical engineering
at New Mexico State University and his masters and doctorate degrees
in electrical engineering from University of California, Davis.
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