Optical: systems and elements – Holographic system or element – Head up display
Patent
1992-04-07
1994-04-19
Arnold, Bruce Y.
Optical: systems and elements
Holographic system or element
Head up display
359630, 359631, 359633, G02B 532, G02B 2710
Patent
active
053051246
ABSTRACT:
A virtual image display system for displaying a relatively large virtual image to a user derived from a relatively small image source. A lens group is provided for amplifying an image provided by the image source. A plurality of reflecting elements are provided for magnifying the image provided by the lens group and for displaying the relatively large virtual image. Several embodiments are provided that include on-axis and off-axis reflecting versions, and a holographic virtual image version. Conventional lenses and reflecting optics are used to provide the on- and off-axis versions of the system, while a holographic reflecting element is used to provide a holographic virtual image. A window element may also be employed to minimize ambient reflection viewed by the user and eliminates ambient reflection to reduce the user's eye fatigue. The display system improves a user's viewing comfort by positioning the image at a distance matching the visual requirements of the user's eye. The large image size also improves the legibility and readability of the display. The present system is especially useful for computer monitor or TV applications and the color version is useful in applications where selected colors are to be highlighted.
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Chern Mao J.
Newberg Howard S.
Stringfellow Steve A.
Alkov L. A.
Arnold Bruce Y.
Denson-Low W. K.
Hughes Aircraft Company
Shafer R. D.
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