Improved display optical performance with notch polarizers and specialized lamps for helmet-mounted display application

Bill Heinze

doi:10.1117/12.241901

7 June 1996 Improved display optical performance with notch polarizers and specialized lamps for helmet-mounted display application

Bill Heinze

Author Affiliations +

Proceedings Volume 2735, Head-Mounted Displays; (1996) https://doi.org/10.1117/12.241901
Event: Aerospace/Defense Sensing and Controls, 1996, Orlando, FL, United States

Abstract

The helmet mounted display (HMD) is an important technology for aircraft cockpit information exchange, and is also of advantage for outdoor field use. For both applications, high display luminance is required to maintain acceptable contrast ratio while competing with environmental forward field scene luminance during bright daylight conditions. For the full color HMD, a broad color gamut is required. Notch Polarizers, made from crosslinked cholesteric liquid crystal silicones and utilized to modulate color with high resolution subtractive color twisted nematic diplay image sources, yield substantial improvements in system luminance efficiency, color gamut, and contrast ratio, compared with conventional color polarizers made with dichroic dyes. A TN subtractive color display system design with notch polarizers is presented, resulting in improved luminance, color gamut, contrast ratio, and contrast ratio in the presence of high ambient luminance. Results are given for backlighting with a broad band Xenon arc lamp, as well as with a trichrominance (primary color) lamp. Very substantial improvements in display system luminance efficiency, color gamut and contrast ratio were achieved.

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Bill Heinze "Improved display optical performance with notch polarizers and specialized lamps for helmet-mounted display application", Proc. SPIE 2735, Head-Mounted Displays, (7 June 1996); https://doi.org/10.1117/12.241901

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