Luminous display device for electric equipments

Details Luminous display device for electric equipments Luminous display device for electric equipments

1991-12-10

1993-10-12

Cranmer, Laurie K.

Card, picture, or sign exhibiting

Changing exhibitor

Alphanumeric device

G09F 900

Patent

active

052513939

ABSTRACT:
The device consists of a container (1) within which a light source (2 and 3) is housed and on top of which a board (6) carrying silk-screen printed alphanumeric characters or symbolisms (7 to 13) is disposed; interposed between said container (1) and silk-screen printed board (6) is a liquid crystal board (14) in which the liquid crystals (15), through a reduction circuit, are activated to a low voltage and made transparent or opaque to the underlying light source (2 and 3) in order to highlight said alphanumeric characters (7 to 13) silk-screen printed on said board (6), or not.

REFERENCES:
patent: 3927375 (1975-12-01), Lanoe et al.
patent: 4021945 (1977-05-01), Sussman
patent: 4231034 (1980-10-01), Bechteler
patent: 4444999 (1984-04-01), Sparrevohn
patent: 4502761 (1985-03-01), Knoll et al.
patent: 4586659 (1986-05-01), Yokoi et al.
patent: 4769639 (1988-09-01), Kawamura et al.
patent: 5025355 (1991-06-01), Harwood

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