Display board illuminating device for passive displays

Details Display board illuminating device for passive displays Display board illuminating device for passive displays

1990-07-30

1991-12-03

Lazarus, Ira S.

Illumination

Revolving

362 26, 362 27, 362 30, 362800, F21V 1300

Patent

active

050704311

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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