Multiple image forming apparatus

Details Multiple image forming apparatus Multiple image forming apparatus

1989-12-18

1991-01-22

Brier, Jeffery A.

Communications: electrical

Land vehicle alarms or indicators

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

340795, 340702, 350174, G09G 100

Patent

active

049874101

ABSTRACT:
A head-up display (HUD)/head-down display (HDD) system capable of projecting multi-color images employs cholesteric liquid crystal elements, two-state liquid crystal devices, an image source, a beam splitter, and a combiner to, in sequence, generate HUD and HDD images. An LCD and cholesteric liquid crystal element operate together to selectively transmit or block portions of an image incident thereon. The switching frequency of the LCD-cholesteric liquid crystal element is above the flicker-fusion frequency, such that both the HUD and HDD displays appear to the observer to be simultaneously and continuously operating.

REFERENCES:
patent: 4688901 (1987-08-01), Albert
patent: 4726663 (1988-02-01), Buzak

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