Display board illuminating device for passive displays
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United States of America Patent
Stats
-
Dec 3, 1991
Grant Date -
N/A
app pub date -
Jul 30, 1990
filing date -
Aug 3, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A display board illuminating device includes a light guide plate arranged to face the back of a display board and a light source disposed to face the side end of the light guide plate. The side end of the light guide plate is inclined toward the center of the light guide plate in the direction of the display board. By this configuration an angle of an optical axis refracted at the surface of the side end and incident into the light guide plate with respect to a main surface of the light guide plate, so that the whole area of the display board is illuminated efficiently.
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