Polarized heads up display

Details Polarized heads up display Polarized heads up display

1991-03-25

1993-05-18

Weldon, Ulysses

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

359 13, G09G 302

Patent

active

052124711

ABSTRACT:
A head-up display for vehicle including a windshield having first and second opposing air interfaces for partially reflecting imaging illumination at a predetermined air interface to produce a primary virtual image viewable by the operator of the vehicle, and a half-wave retarder interposed between the first and second air interfaces of the windshield for rotating the linear polarization of illumination transmitted therethrough. An imaging illumination source provides linearly polarized imaging illumination to the first air interface of the windshield at an angle which is selected to enhance the reflection of S-polarized light and the transmission of P-polarized light, with the polarization being selected so as to provide S-polarized imaging illumination at the predetermined beam splitting air interface.

REFERENCES:
patent: 2750833 (1952-05-01), Gross
patent: 4688879 (1987-08-01), Fairchild
patent: 4787711 (1988-11-01), Suzuki
patent: 4913529 (1990-04-01), Goldenberg
patent: 4932731 (1990-06-01), Suzuki
patent: 4973132 (1990-11-01), McDonald et al.

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