Display system for displaying information in the viewfinder of a

Details Display system for displaying information in the viewfinder of a Display system for displaying information in the viewfinder of a

1989-09-13

1991-05-28

Adams, Russell E.

354402, 354432, 354475, 354474, G03B 1718

Patent

active

050198548

ABSTRACT:
A display system for displaying information in the viewfinder of a camera, capable of displaying a positive pattern indicating a distance measuring area and a light measuring area on a transparent background so that a photographing field can be seen through the transparent background of the pattern. The display system comprises a liquid crystal display of a guest-host type disposed near the focal plane of the optical system of the viewfinder. The liquid crystal display comprises transparent electrodes provided with a pattern indicating distance measuring areas and light measuring areas, a liquid crystal of a cholestericnematic phase transition type having a negative anisotropic dielectric property as host, and a dichroic coloring matter having an anisotropic light absorption property as guest. The pattern having a high opacity is displayed on a transparent background in the viewfinder in a satisfactory contrast to the background.

REFERENCES:
patent: 4299462 (1981-11-01), Suzuki et al.
patent: 4465355 (1984-08-01), Murakami et al.
patent: 4572617 (1986-02-01), Masaki et al.
patent: 4856869 (1989-08-01), Sakata et al.

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