Suppressing Display Cockpit Reflections

Rudolf Hartmann

doi:10.1117/12.940464

17 September 1987 Suppressing Display Cockpit Reflections

Rudolf Hartmann

Proceedings Volume 0778, Display System Optics; (1987) https://doi.org/10.1117/12.940464
Event: 1987 Technical Symposium Southeast on Optics, Electro-Optics, and Sensors, 1987, Orlando, FL, United States

Abstract

Modern aircraft displays with relatively high visual brightness levels present day and night sensor images (generated by electro-optical systems) to crew members for navigation and fire control purposes. A heads out display (HOD) on a cathode ray tube (CRT) screen, while effective for one crew member, may distract or irritate another crew member if the image is reflected off a canopy panel into his eyes, particularly at night. This paper presents one solution applied to canopy reflection suppression encountered in the U.S. Army's APACHE Advanced Attack Helicopter where the co-pilot's HOD reflections interfered with the pilot's vision. When the co-pilot would move his head away from the screen, the reflected image path to the pilot, sitting above and behind the co-pilot, would no longer be blocked and distract him. A variety of polarizers were studied and the problem was solved by placing a linear polarizer over the CRT with its axis crossed relative to the skipping vector of the reflection, letting the canopy panel act as an analyzer. Reflected luminance was reduced by more than 25 times.

Citation Download Citation

Rudolf Hartmann "Suppressing Display Cockpit Reflections", Proc. SPIE 0778, Display System Optics, (17 September 1987); https://doi.org/10.1117/12.940464

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KEYWORDS

CRTs

Optical filters

Eye

Reflection

Linear filtering

Image filtering

Displays

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