Display board assembly

Details Display board assembly Display board assembly

1990-02-06

1991-06-04

Cranmer, Laurie K.

Card, picture, or sign exhibiting

Illuminated sign

Lamp box

40573, G09F 1304

Patent

active

050202537

ABSTRACT:
A display board assembly, which includes a start unit connected to an end unit with a variety of intermediate display units set in therebetween in a line. By means of color contrast and diaphaneity difference the symbols on the intermediate which show a certain meaning collectively can be clearly seen in the day. When in the dark, a photosensor automatically triggers the light emitting diodes of the intermediate display units to illuminate the symbols thereon.

REFERENCES:
patent: 4058919 (1977-11-01), Wakabayashi
patent: 4371285 (1983-02-01), Behar
patent: 4532579 (1985-07-01), Merryman
patent: 4682147 (1987-07-01), Bowman
patent: 4765080 (1988-08-01), Conti

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