Shiva Prakash

P-224: Damage-Free Cathode Coating Process for OLEDs

OLED displays require the growth of inorganic films over organic films. The inorganic film sometimes manifests as cathode metal (bottom-emission displays), or as the optical enhancement layer (OEL, in top emission displays). Sputtering is the first process of choice in both cases due to simplicity, low cost and scalability. However, plasma damage to the organic underlayers prevents sputtering from being routinely used. A closed-drift ion beam sputtering process was found effective in growing inorganic films with negligible damage to the organic underlayers.

Plastic displays: recent developments at DuPont Displays

This paper will discuss recent developments in making of passive and active matrix OLED devices on polyethylene napthalate (PEN) which has been improved for the use in display device applications. The improved film properties are meeting many of the desired needs and specifications for display and process applications as they are understood today. Improvements to the films surface quality, and its inherent properties make PEN a good choice for OLED applications. Processing the plastic substrate through the OLED device making process can contribute to small changes in the substrate dimensions. Photolithography process is a critical part of the OLED device making process, knowing to compensate for substrate size does address technical challenges in overlay registration.