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 film's 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.
Gang Yu, Gordana Srdanov, Belinda Zhang, Matthew Stevenson, Jian Wang, Peter Chen, Erlinda Baggao, Johnny Macias, Runguang Sun, Charlie McPherson, Paul Sant, Jeffrey Innocenzo, Matthew Stainer, Marie O'Regan
Active-matrix organic/polyeric light emitting displays (AMOLEDs/AMPLEDs) are of great potentials for high information content display applications. They offer high brightness, fast response time, high image quality (high contrast, high gray levels and small pixel pitch size) and low power consumption. AMPLEDs are ideal for portable electronic devices such as web-phones, personal data assistants, GPS and handhold computers. AMPLEDs are especially suitable for motion picture applications. Since the image pixels consume power only when they are turned on, and only consume the power necessary for their corresponding brightness, video displays made with AMOLED/AMPLED reduce power consumption and extend display lifetime considerably. Motion picture applications also minimize image retention and optimize display homogeneity. In this presentation, we discuss our recent progress on AMPLEDs and compare their performance with that of AMLCD.
Kalluri Sarma, Charles Chanley, Sonia Dodd, Jared Roush, John Schmidt, Gordana Srdanov, Matthew Stevenson, Ralf Wessel, Jeffrey Innocenzo, Gang Yu, Marie O'Regan, W. MacDonald, R. Eveson, Ke Long, Helena Gleskova, Sigurd Wagner, James Sturm
Flexible displays fabricated using plastic substrates have a potential for being very thin, light weight, highly rugged with greatly minimized propensity for breakage, roll-to-roll manufacturing and lower cost. The emerging OLED display media offers the advantage of being a solid state and rugged structure for flexible displays in addition to the many potential advantages of an AM OLED over the currently dominant AM LCD. The current high level of interest in flexible displays is facilitating the development of the required enabling technologies which include development of plastic substrates, low temperature active matrix device and backplane fabrication, and display packaging. In the following we will first discuss our development efforts in the PEN based plastic substrates, active matrix backplane technology, low temperature (150°C) a-Si TFT devices and an AM OLED test chip used for evaluating various candidate designs. We will then describe the design, fabrication and successful evaluation and demonstration of a 64x64 pixel AM OLED test display using a-Si TFT backplane fabricated at 150°C on the flexible plastic substrate.
Photogeneration efficiencies have been measured in dual layer aggregate photoreceptors over a wide range of fields and wavelengths. The results are described by a surface-enhanced exciton dissociation model. The model is based on a theory of geminate recombination, originally due to Onsager. The Onsager theory is based on the assumption that the absorption of a photon creates a bound electron-hole pair which then either dissociates into a free electron and a free hole, or undergoes recombination. The key parameters of the theory are the fraction of absorbed photons that create bound pairs, and the electron-hole separation distance of the bound pair. For aggragate materials, the yield of creating the bound pairs is 0.60. The separation distances are between 20 and 60 angstrom. The high photogeneration efficiencies in these materials are attributed to both the high yield of creating the bound pairs and the low electron-hole recombination probability because of the large pair separation distances.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.