Liquid crystal display

Details Liquid crystal display Liquid crystal display

1974-10-16

1976-04-13

Jackmon, Edith Simmons

58 50A, G02F 113, G04B 1930

Patent

active

039500780

ABSTRACT:
An electrooptic display for watches with improved night visibility comprises a liquid crystal cell with actuatable character segments and polarizing elements mounted on either side thereof, a reflector behind one of the polarizer elements and light emitting segments on the reflector aligned with the character segments.
In a first embodiment, the reflector has thin lines of phosphorescent material painted on its surface adjacent the polarizing element. In a second embodiment, the reflector has small slits aligned with the character segments and a phosphorescent material is painted into the slit area behind the reflector.
Both embodiments preferably employ a display having clear or light characters against a dark background. Thus during nighttime use, light radiating from the phosphorescent material may be seen by the viewer through each energized (or transparent) segment. Light from the phosphorescent material behind deenergized segments is blocked. The outer polarizing element may be rotatable from a crossed position through an angle of 90.degree. to provide a dark on light display for optimum daytime viewing.

REFERENCES:
patent: 3811751 (1974-05-01), Myer
patent: 3841083 (1974-10-01), Bergey
patent: 3864905 (1975-02-01), Richardson
patent: 3869195 (1975-04-01), Aldrich et al.
patent: 3882490 (1975-05-01), Tashiro

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