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Proceedings Paper

Passive and active matrix addressed polymer light-emitting diode displays
Author(s): Ton van de Biggelaar; Ivo G. J. Camps; Mark Childs; Martin Fleuster; Andrea Giraldo; Sandra Godfrey; Iain M. Hunter; Mark T. Johnson; Herbert Lifka; Remco Los; Aad Sempel; John M. Shannon; Michael J. Trainor; Richard W. Wilks; Nigel D. Young
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Paper Abstract

Polymer LEDs provide a new alternative to LCDs for many display applications, and are particularly attractive because of their high brightness, near-perfect viewing angle, and very fast response time. In this paper, the basic technology used to form the LED structures, and the performance of these devices is presented. Then, the fabrication and driving of passive addressed matrix displays formed using this technology is discussed. Finally, the necessity for active matrix addressing for larger size and higher resolution displays is demonstrated, and it is shown that this is best achieved using low temperature poly-Si technology. The state-of-the-art poly-Si technology used for active matrix addressed LED displays is described, with particular reference to transistor variation, and the resulting non-uniformities in images on displays. A variety of different addressing techniques, and pixel circuits can be used to drive the LEDs in the active matrix, and the performances of these schemes are compared. These include the basic current source circuit; the modified current source circuit; transistor current mirror circuits; and circuits with optical feedback and correction for uniformity variation. Consideration is given both to analogue and to digital drive methods.

Paper Details

Date Published: 30 April 2001
PDF: 13 pages
Proc. SPIE 4295, Flat Panel Display Technology and Display Metrology II, (30 April 2001); doi: 10.1117/12.424868
Show Author Affiliations
Ton van de Biggelaar, Philips Research Labs. (Netherlands)
Ivo G. J. Camps, Philips Research Labs. (Netherlands)
Mark Childs, Philips Research Labs. (United Kingdom)
Martin Fleuster, Philips Components BV (Netherlands)
Andrea Giraldo, Philips Research Labs. (Netherlands)
Sandra Godfrey, Philips Research Labs. (United Kingdom)
Iain M. Hunter, Philips Research Labs. (United Kingdom)
Mark T. Johnson, Philips Research Labs. (Netherlands)
Herbert Lifka, Philips Research Labs. (Netherlands)
Remco Los, Philips Research Labs. (Netherlands)
Aad Sempel, Philips Research Labs. (Netherlands)
John M. Shannon, Philips Research Labs. (United Kingdom)
Michael J. Trainor, Philips Research Labs. (United Kingdom)
Richard W. Wilks, Philips Research Labs. (United Kingdom)
Nigel D. Young, Philips Research Labs. (United Kingdom)

Published in SPIE Proceedings Vol. 4295:
Flat Panel Display Technology and Display Metrology II
Edward F. Kelley; Edward F. Kelley; Apostolos T. Voutsas, Editor(s)

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