Visual characteristics of LED display pushbuttons for avionic applications

Paolo Vanni; Felice Isoldi

doi:10.1117/12.45436

1 August 1991 Visual characteristics of LED display pushbuttons for avionic applications

Paolo Vanni, Felice Isoldi

Proceedings Volume 1456, Large Screen Projection, Avionic, and Helmet-Mounted Displays; (1991) https://doi.org/10.1117/12.45436
Event: Electronic Imaging '91, 1991, San Jose, CA, United States

Abstract

Programmable LED matrix display push buttons may greatly increase the performances of the computer-based avionic systems. The number of switches in a control panel can be reduced by a factor of 10 or more. This leads to a reduction in weight and size of the control instrumentations and in shorter response time of pilots. This work deals with the study and the optimization of visual performances of these displays in a configuration requiring a low- power consumption and Night Vision Goggles (NVG) compatibility. In considering displays for avionic applications, it is important to take into account sunlight readability. Visibility problems may arise in high ambient illumination. Up to now the only contributions usually considered for reduction of visibility are the diffused and specular reflected luminances that predominate with the sun behind the pilot. But there is another critical condition--the sun in front of the pilot. In this case the equivalent veiling glare predominates. Display performances and contrast enhancement filter characteristics must be optimized to find a compromise between these two extreme ambient conditions. Considering a keyboard with 10 push buttons, with two lines of four characters each and a power consumption less than 14 W with 40 of LEDs on, the authors have obtained good sunlight readability, choosing an optimized combination of NVG and contrast enhancement filter and LED matrix display.

Citation Download Citation

Paolo Vanni and Felice Isoldi "Visual characteristics of LED display pushbuttons for avionic applications", Proc. SPIE 1456, Large Screen Projection, Avionic, and Helmet-Mounted Displays, (1 August 1991); https://doi.org/10.1117/12.45436

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KEYWORDS

Light emitting diodes

Sun

LED displays

Transmittance

Reflectivity

Visualization

Optical filters

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