04740780 is referenced by 138 patents and cites 14 patents.

A head-up display for use in an automotive or other vehicle having limited space. The optical path from display symbol generator to a collimating lens is folded to fit in a relatively compact housing. Also shown is the use of the automobile windshield as a combiner glass for the display. Corrective lenses, and in particular crossed linear fresnel lenses, are used to correct for the astigmatism introduced by the geometry of the windshield. This provides a combination of optical powers for the display lens and the windshield which has the resultant effect of projecting an image from the image source to the driver's eye. The source is a high light output array of light-emitting diodes. A microprocessor based controller for detecting the status of inputs from the automobile is shown. Data is periodically loaded into a random access memory dedicated to controlling the display. When data is not being loaded, a separate address and timing generator is used to cause data from this memory to be displayed in a free-running mode.

Title
Head-up display for automobile
Application Number
6/747861
Publication Number
4740780
Application Date
June 24, 1985
Publication Date
April 26, 1988
Inventor
Maurice L Stephenson
Mableton
GA, US
Scott W Patterson
Norcross
GA, US
Ronald A Sargent
Atlanta
GA, US
John Weaver
Chamblee
GA, US
Steven E Brown
Atlanta
GA, US
Assignee
GEC Avionics
GA, US
IPC
G02B 27/10
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