Lighted subway signage

Details Lighted subway signage Lighted subway signage

2011-01-18

2011-01-18

Hoge, Gary C (Department: 3611)

Card, picture, or sign exhibiting

Changing exhibitor

Variable reading stationary exhibitor

C040S442000, C040S564000, C352S100000

Reexamination Certificate

active

07870686

ABSTRACT:
A subway tunnel light box for displaying a back-lighted image to a viewer inside of a subway car traveling in the subway tunnel in which a transparent video display for displaying a number of images, such as an LCD, is mounted in the light box and a narrow light source, preferably having a width of one pixel, is positioned in the box behind each of the images at a distance less than a typical viewing distance so that each image is illuminated by an associated narrow light source with an associated narrow light source horizontal illumination angle substantially the same as a preselected perceived horizontal viewing angle calculated for the typical viewing distance based upon a physical height of the transparent video display and a desired aspect ratio of a perceived image.

REFERENCES:
patent: 742632 (1903-10-01), Hadden
patent: 917587 (1909-04-01), Good
patent: 978854 (1910-12-01), Czerniewski
patent: 2026753 (1936-01-01), Rosenthal et al.
patent: 4179198 (1979-12-01), Brachet et al.
patent: 4383742 (1983-05-01), Brachet et al.
patent: 6353468 (2002-03-01), Howard et al.
patent: 2005/0174539 (2005-08-01), Walker et al.

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