Ghost-free automotive head-up display employing a wedged...

Details Ghost-free automotive head-up display employing a wedged... Ghost-free automotive head-up display employing a wedged...

G - Physics

02

B

18/1052, 296/41,

G02B 27/00 (2006.01) B29C 45/00 (2006.01) B32B 17/10 (2006.01) B60J 1/02 (2006.01) C03C 27/12 (2006.01) G02B 27/01 (2006.01) G03B 21/28 (2006.01)

Patent

CA 2025610

A substantially ghost-free head-up display for a vehicle such as an automobile is disclosed. A head-up display unit projects the image beam toward the vehicle windshield for reflection back toward the viewer's eye. The windshield is slightly tapered so that the reflected images from the outside and inside surfaces of the wind- shield are reflected at slightly different angles, chosen so that the images substantially overlap at the viewer's eye. Use of a properly selected taper results in substan- tially ghost-free operation. The taper can be achieved by sandwiching a tapered layer of transparent material such as polyvinylbutyral between two windshield singlets.

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