Dual backlighting system for avionic AMLCDs

Michael H. Kalmanash; Gayathri Sundaresan

doi:10.1117/12.241010

30 May 1996 Dual backlighting system for avionic AMLCDs

Michael H. Kalmanash, Gayathri Sundaresan

Proceedings Volume 2734, Cockpit Displays III; (1996) https://doi.org/10.1117/12.241010
Event: Aerospace/Defense Sensing and Controls, 1996, Orlando, FL, United States

Abstract

Avionic displays are required to be fully functional over a wide range of ambient illumination, encompassing bright sunlight during the day and dim starlit sky at night. Additionally, in most applications the night operation is required to be compliant with night vision imaging system (NVIS A or B) goggles. This article describes a patented dual lighting system, employing a hot cathode fluorescent lamp for the day mode and a filtered cold cathode fluorescent lamp against a light pipe (edgelit) for the night mode of operation. Since the two modes of operation are decoupled from each other, the day mode can be designed for high luminance and broad color gamut, regardless of NVIS requirements, while the night mode can be designed to be compatible with either the NVIS-A or NVIS-B systems with no impact to the day mode. This unique blacklight design provides a wide dimming range for the display and delivers excellent performance under all viewing conditions. Furthermore, this approach provides excellent uniformity in the night mode with minimal color shifts over view angles and has been successfully implemented on two cockpit display programs.

Citation Download Citation

Michael H. Kalmanash and Gayathri Sundaresan "Dual backlighting system for avionic AMLCDs", Proc. SPIE 2734, Cockpit Displays III, (30 May 1996); https://doi.org/10.1117/12.241010

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