Low-cost monochrome CRT helmet display

Roger Leinenwever; Leonard G. Best; Bryce J. Ericksen

doi:10.1117/12.131953

30 October 1992 Low-cost monochrome CRT helmet display

Roger Leinenwever, Leonard G. Best, Bryce J. Ericksen

Proceedings Volume 1695, Helmet-Mounted Displays III; (1992) https://doi.org/10.1117/12.131953
Event: Aerospace Sensing, 1992, Orlando, FL, United States

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.

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Roger Leinenwever, Leonard G. Best, and Bryce J. Ericksen "Low-cost monochrome CRT helmet display", Proc. SPIE 1695, Helmet-Mounted Displays III, (30 October 1992); https://doi.org/10.1117/12.131953

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KEYWORDS

CRTs

Head-mounted displays

Electronics

Visualization

Video

Modulation transfer functions

Head

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