KEYWORDS: Light emitting diodes, LED backlight, LCDs, Lamps, RGB color model, Waveguides, Manufacturing, LED displays, Temperature metrology, Resistance
Defense and security applications of flat panel displays can benefit from advances in backlighting techniques and
technologies to achieve improved contrast and brightness, enhanced chromaticity, lighter weight, thinner form factor,
and overall power dissipation. Capturing these benefits requires consideration of multiple engineering and
manufacturing trade-offs and can seem overwhelming for display-head designers. This study focuses on how to
determine which trade-offs are important in particular applications, how to evaluate trade-off opportunities for cost and
performance while maintaining conformance with applications requirements, and how to create and maintain an
effective supply chain while adapting to constantly shifting COTS component availability.
Continuing advances in commercial off-the-shelf (COTS) flat panel display components offer attractive opportunities for
reducing overall display head costs while improving display performance as well as packaging efficiencies in size,
weight, and power. Capturing these benefits requires consideration of multiple engineering and manufacturing trade-offs
and can seem overwhelming to system integrators. Modification and/or integration of optical, mechanical and electronic
components can be required to meet environmental or usage requirements which frequently exceed the performance
envelope of COTS components. This study focuses on how to determine which trade-offs are important in particular
applications and how to evaluate trade-off opportunities for cost and performance while maintaining conformance with
application requirements.
To ensure reliability goals for the 777 display systems are met, Honeywell began a three and one-half year life test of the display backlight systems in July of 1992. To date, sixteen backlight assemblies have accumulated over 12,500 hours of test operation using a luminance profile that is representative of that expected for 777 flight operations. This paper describes design and operating characteristics, life test design, and life test results for the backlight systems of the 777 flight deck displays.
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