Stacked STN LCDs for true-color projection systems

Paul E. Gulick; Arlie R. Conner

doi:10.1117/12.45421

1 August 1991 Stacked STN LCDs for true-color projection systems

Paul E. Gulick, Arlie R. Conner

Author Affiliations +

Proceedings Volume 1456, Large Screen Projection, Avionic, and Helmet-Mounted Displays; (1991) https://doi.org/10.1117/12.45421
Event: Electronic Imaging '91, 1991, San Jose, CA, United States

Abstract

The demand for a true color LCD projection panel for use with standard overhead projectors has been around ever since the first monochrome OHP projection panel was introduced in 1986. The monochrome panels evolved along with the LCD technology from the first blue- and-yellow mode units to black-and-white with levels of gray, and to yellow-and-magenta panels with limited intermediate color shades known as pseudo-color. Finally, a novel solution has been implemented using a stack of custom designed STN panels, making possible true color LCD projection panels that are reasonably priced, available in high volume and quite acceptable in overall image quality. This stacked technology relies on the inherent birefringence colors of each layer to switch between white (passing all wavelengths) and a subtractive color primary (passing all wavelengths but red, green, or blue) so the full spectrum can be projected. Standard gray-scale techniques expand the displayable color palette to almost 5,000 colors and beyond. The same technology can also be applied to various self-contained projection architectures.

Citation Download Citation

Paul E. Gulick and Arlie R. Conner "Stacked STN LCDs for true-color projection systems", Proc. SPIE 1456, Large Screen Projection, Avionic, and Helmet-Mounted Displays, (1 August 1991); https://doi.org/10.1117/12.45421

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