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Proceedings Paper

Disparity between combiners in a double-combiner head-up display
Author(s): Jonathan Cohen; Abraham Reichert
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Paper Abstract

The instantaneous field of view (IFOV) of head-up display (HUD) systems is often enlarged by using a double combiner. Each combiner provides a partial field of view, with a degree of overlap between them. In a HUD with a double combiner a particular aberration arises consisting of an angular discrepancy between the images reflected from the two combiners. It generally causes an increase in the line width in the overlapping area of the field of view. In the extreme case a double image will appear. The problem can be partially solved by introducing a small angle between the combiners. However, this eliminates the aberration only at a single point in the field of view. A more comprehensive solution is provided by special design of the projecting lens system. The lens will have smaller aberrations at the center of the field of view, which includes the area of overlap of the two combiners, at the expense of the outer part of the field. This is usually a practical solution as the accuracy required in a HUD system is generally less stringent at larger field angles.

Paper Details

Date Published: 1 August 1991
PDF: 12 pages
Proc. SPIE 1456, Large Screen Projection, Avionic, and Helmet-Mounted Displays, (1 August 1991); doi: 10.1117/12.45433
Show Author Affiliations
Jonathan Cohen, El-Op Electro-Optics Industries Ltd. (Israel)
Abraham Reichert, El-Op Electro-Optics Industries Ltd. (Israel)

Published in SPIE Proceedings Vol. 1456:
Large Screen Projection, Avionic, and Helmet-Mounted Displays
Harry M. Assenheim; Richard A. Flasck; Thomas M. Lippert; Jerry Bentz, Editor(s)

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