Bor-Yeu Tsaur

Topographic Imperfections in Zone Melting Recrystallized Si Films on SiO2

Examen des principales imperfections topographiques et discussion de leur variation avec les profils thermiques presents durant le processus de recristallisation. Observation de vides formes dans les films cristallises par contamination lors de la preparation de la pastille

Miniature 1280 by 1024 active matrix liquid crystal displays

A miniature 1280 by 1024 transmissive active matrix liquid crystal display (AMLCD) was developed for the RAH-66 Comanche helicopter head-mounted displays and other military applications. The display has an active area of 15.4 mm by 12.3 mm with a diagonal of 19.7 mm (0.77 inches). The display has a 12 micrometer pixel pitch, yet a clear optical aperture of over 30% was achieved by using a 0.8 micrometer CMOS design rule for the active-matrix circuit fabrication. The fabrication process used was similar to that of Kopins commercial CyberDisplay AMLCDs, which produces high performance, high reliability devices. To achieve low temperature operation to -40 C, the display was designed with an integrated thermal sensor to allow control of a heater. Display test results include contrast ratios over 100, continuous gray scale, fast response times for 60 Hz operation, and the ability to show both gray-scale images and symbology at display luminescence levels over 2,000 foot- Lamberts brightness. This latter result will enable this display to be used in systems with full sunlight readability requirements. The design, fabrication, and characterization of this display are discussed.