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Proceedings Paper

Active matrix LCDs driven by two- and three-terminal switches: a comparison
Author(s): Willem den Boer; Zvi Yaniv
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Paper Abstract

Active matrix LCDs are now penetrating the market for avionic and computer displays after initial success in pocket TVs. AMLCDs require the deposition and patterning of metal, insulator and semiconductor films, comparable to the processing for integrated circuits, but on large area substrates. The thin film switch at each picture element can be a three-terminal device (thin film transistor or TFT) or a two-terminal device (diode). Both technologies have been successful and are being scaled up for volume production. As three-terminal switches, amorphous silicon and ploy-Si TFTs are mostly used. Two-terminal devices include metal- insulator-metal diodes and a-Si pin diodes. Each technology has its pros and cons. TFT LCDs are generally more difficult to fabricate and have crossing lines on the active array substrate, which can reduce yield. Diode LCDs are usually simpler to manufacture and do not have crossing lines on one substrate. Auxiliary capacitors at each pixel, which improve gray scale performance, can be incorporated in TFT LCDs without extra processing, whereas in diode LCDs they complicate processing significantly. These and other merits and drawbacks of the two technologies are presented.

Paper Details

Date Published: 1 June 1991
PDF: 1 pages
Proc. SPIE 1455, Liquid-Crystal Devices and Materials, (1 June 1991); doi: 10.1117/12.44696
Show Author Affiliations
Willem den Boer, OIS Optical Imaging Systems, Inc. (United States)
Zvi Yaniv, OIS Optical Imaging Systems, Inc. (United States)

Published in SPIE Proceedings Vol. 1455:
Liquid-Crystal Devices and Materials
Paul S. Drzaic; Uzi Efron, Editor(s)

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