Optical display apparatus
AssigneePilkington P.E. Limited
InventorDavid W. Swift
Life of this patent
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Abstract
A relatively simple dual display system, e.g. a map or stand-by graticule superimposed on a radar or main display, is provided by use of holography. A holographic element when illuminated with a reconstruction beam from a light source provides a holographic image of visual information at a postiion behind and spaced from the element itself. The element is mounted an appropriate distance in front of a cathode ray tube such that the holographic image appears at the phosphor surface superimposed on and coincident with the CRT display.
Claims12
Optical display apparatus comprising a display source having a display surface on which first visual information can be displayed, a holographic element providing a reflection hologram of second visual information recorded so as to define a holographic image surface of a configuration corresponding to the configuration of the display surface and located at a distance behind the holographic element, means mounting the holographic element at a corresponding distance in front of the display surface, and means located in front of the holographic element for illuminating the element so that the holographic image surface coincides with the display surface.
Dependencies are inferred from the claim text.