Automotive instrument 3-D virtual image display

Details Automotive instrument 3-D virtual image display Automotive instrument 3-D virtual image display

1993-09-30

1995-08-08

Lee, John D.

Optical: systems and elements

Single channel simultaneously to or from plural channels

By partial reflection at beam splitting or combining surface

345 7, 359 13, 359633, G02B 2710

Patent

active

054404282

ABSTRACT:
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.

REFERENCES:
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patent: 4790613 (1988-12-01), Moss
patent: 4795223 (1989-01-01), Moss
patent: 4961625 (1990-10-01), Wood et al.
patent: 4988976 (1991-01-01), Lu
patent: 5013135 (1991-05-01), Yamamura

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