G - Physics – 02 – B
Patent
G - Physics
02
B
G02B 27/22 (2006.01) B60K 37/02 (2006.01) B60Q 3/04 (2006.01) G01D 11/28 (2006.01) G02B 27/00 (2006.01)
Patent
CA 2132999
-39- ABSTRACT OF THE DISCLOSURE A compact, inexpensive and mass-producible optical display system for an automobile creates a dramatic and highly stylistic, sharp, high contrast and pleasing, multi-color or monochromatic 3-D magnified image of an instrument cluster, at least a portion of the 3-D image being located at a viewing distance greater than the actual optical distance between the dashboard and the driver's eyes. A non-pupil forming display system uses an off-axis aspherical narrow band reflecting mirror with power to create a magnified virtual image of a miniaturized passive image source, such as a segmented LCD panel, which is backlighted by a small filament incandescent light bulb. A single mirror produces a single monochromatic virtual image, whereas a plurality of stacked and differently curved mirrors, each tuned to different wavelength bandwidth, produces a plurality of spatially separated virtual images of differing colors. The mirrors are holographic optical elements or graded index optical elements. A backlit panel display positioned behind the mirror produces an image with colors outside the bandwidth of that mirror and thereby creates a secondary image of oversized warning indicators or the like visible in front of the virtual image which includes a display of other instruments. A non-planar image source used with the mirror produces a non-planar monochromatic virtual image.
Chern Mao-Jin
Hegg Ronald G.
Hughes Aircraft Company
Sim & Mcburney
LandOfFree
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