Method of increasing the brightness of an image and helmet mounted display.

摘要

A helmet mounted display in which a filter (34) receives rays of light at various angles of incidence from an image (40) to be superimposed on the scene being viewed by the operator and reflects these rays to a second surface (32) where the rays are re-reflected through the filter (34) and to the eye (28) of the observer characterized in that the filter is coated in such a manner that it reflects from each position (A-F) on its surface rays from the image that strike at predetermined angles of incidence but which transmits at each position rays which are received from the second surface