Daylight luminance requirements for full-color, see-through, helmet-mounted display systems

Thomas H. Harding; Clarence E. Rash

doi:10.1117/1.OE.56.5.051404

31 January 2017 Daylight luminance requirements for full-color, see-through, helmet-mounted display systems

Thomas H. Harding, Clarence E. Rash

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Optical Engineering, Vol. 56, Issue 5, 051404 (January 2017). https://doi.org/10.1117/1.OE.56.5.051404

Abstract

When color is implemented in helmet-mounted displays (HMDs) that are eyes-out, see-through displays, visual perception issues become an increased concern. A major confound with HMDs is their inherent see-through (transparent) property. The result is color in the displayed image that combines with color from the outside (or in-cockpit) world, producing an image with additive color. As luminance of the HMD imagery is reduced, the color separation between the HMD imagery and the background is also reduced. It is because of this additive effect that luminance contrast is so vitally important in developing HMD standards for color symbology. As a result, this paper identifies luminance requirements for full-color HMDs based upon two lines of investigation. The first is based on a study of white symbology against natural static backgrounds, where the quality of symbology was judged to be a function of not only the background luminance but also of the background complexity as well. The second is based on an evaluation of the complexity inherent in natural backgrounds and from this investigation, a predictive curve was found that describes the complexity of natural backgrounds as a function of ambient luminance.

CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Thomas H. Harding and Clarence E. Rash "Daylight luminance requirements for full-color, see-through, helmet-mounted display systems," Optical Engineering 56(5), 051404 (31 January 2017). https://doi.org/10.1117/1.OE.56.5.051404

Received: 26 September 2016; Accepted: 11 January 2017; Published: 31 January 2017

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