Dual-mode image display apparatus for displaying color images an

Details Dual-mode image display apparatus for displaying color images an Dual-mode image display apparatus for displaying color images an

1994-01-19

1996-06-04

Metjahic, Safet

Television

Video display

Color sequential

348816, 348835, 348791, 348786, H04N 912

Patent

active

055238025

ABSTRACT:
A dual-mode image display apparatus includes a black-and-white image display device and a selective filter. The selective filter is caused to assume a first mode in which it sequentially serves as red, green and blue filters, and a second mode in which it transmits all the color components. Thus, the image display apparatus can selectively perform color display or black-and-white display. The selective filter may include variable optical retarders and may be caused to selectively assume the first mode or the second mode through control over the variable optical retarders. The selective filter may alternatively be moved by a motor between a first position in which the filter is in the path of light from the display device to the viewer, and a second position in which the filter is out of the path of light. A power supply controller is also used to conserve power by turning unneeded parts of a color image processing circuit OFF when the display apparatus is in the second mode.

REFERENCES:
patent: 4399455 (1983-08-01), Alvarez
patent: 4758818 (1988-07-01), Vatne
patent: 5357288 (1994-10-01), Hiroshima
"Television" by F. Kerkhof & W. Werner, Philips Technical Library, pp. 376-379, first published 1952.
Liquid Crystal Apparatus for Converting Black and White CRT Display into Colored Display, IBM Technical Disclosure Bulletin, A. N. Brinson & A. D. Edgar, vol. 22, No. 5, pp. 1769-1771, Oct. 1979.

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