Head up display with a lens decentered to the optical axis of th

Details Head up display with a lens decentered to the optical axis of th Head up display with a lens decentered to the optical axis of th

1994-09-30

1999-02-02

Gross, Anita Pellman

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 13, 359630, G02F 11335, G03H 100, G02B 2714

Patent

active

058672877

ABSTRACT:
A low cost, compact projection display source that serves as a very bright image source for an automotive head up display. The present invention is comprised of a high intensity halogen light source and a liquid crystal display. The liquid crystal display is controlled by display electronics that write images onto the liquid crystal display that are to be displayed to the driver or passengers of a vehicle. Light output from the high intensity light source is transmitted through a piece of infrared energy absorbing glass, a decentered lens, such as a Fresnel lens, and a diffuser that uniformly backlights the liquid crystal display. Crossed polarizers are used on either side of the liquid crystal display. The high intensity light output transmitted by the liquid crystal display is passed through a yellow-orange output window which is projected onto a toric combiner for display to the driver of the vehicle. A fan provides cooling for the liquid crystal display and display circuitry that interfaces between the display electronics and the liquid crystal display. The projection display source produces a very high contrast (very bright) image source without heat problems. The projection display source is capable of producing 20,000 foot-lamberts of light energy output. The projection display source is the brightest known image source for non-military head up displays of either the non-reconfigurable or reconfigurable variety. The yellow-orange color used for the output window of the projection display source is used to maximize color contrast with the display background.

REFERENCES:
patent: 4799765 (1989-01-01), Ferrer
patent: 5231379 (1993-07-01), Wood et al.

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