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Proceedings Paper

Low-cost monochrome CRT helmet display
Author(s): Roger Leinenwever; Leonard G. Best; Bryce J. Ericksen
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Paper Abstract

The goal of the cathode ray tube (CRT) helmet-mounted display (HMD) project was development and demonstration of a low-cost monochrome display incorporating see-through optics. The HMD was also to be integrable with a variety of image generation systems and suitable for use with low-cost cockpit trainers and night vision goggles (NVG) training applications. A final goal for the HMD was to provide a full field of regard (FOR) using a head-tracker system. The resultant HMD design included two 1 inch CRTs used with a simple optical design of beam splitters and spherical mirrors. The design provides for approximately 50% transmission and reflectance capabilities for observing the 30 degree(s) vertical X 40 degree(s) horizontal biocular instantaneous field-of-view visual image from a graphic image generator system. This design provides for a theoretical maximum of 10.8% of the CRT image source intensity arriving at the eye. Initial tests of image intensity at the eye for an average out-the-window scene have yielded 12 to 13 Foot Lamberts with the capability of providing approximately 130 Foot Lamberts. Invoking a software 'own ship' mask to 'blackout' the visual image, the user can monitor 'in-cockpit' instrumentation utilizing the see- through characteristics of the optics. The CRTs are operated at a TV line rate with a modulation transfer function (MTF) of approximately 65%. The small beam spot size and the high MTF provide for an enhanced image display. The display electronics are designed to provide a monochrome video picture based on an RS170 video input.

Paper Details

Date Published: 30 October 1992
PDF: 4 pages
Proc. SPIE 1695, Helmet-Mounted Displays III, (30 October 1992); doi: 10.1117/12.131953
Show Author Affiliations
Roger Leinenwever, GE Government Services (United States)
Leonard G. Best, GE Government Services (United States)
Bryce J. Ericksen, Visual Display Consultant (United States)


Published in SPIE Proceedings Vol. 1695:
Helmet-Mounted Displays III
Thomas M. Lippert, Editor(s)

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