Automatically illumination control device of an elevator display screen
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jan 27, 2004
Grant Date -
Jan 22, 2004
app pub date -
Jul 16, 2002
filing date -
Jul 16, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An automatically illumination control device of an elevator display screen serves for displaying the position and maintenance of the elevator. A light sensor for detecting the intensity of light is installed to the display screen. The light sensor detects the illumination of the environment light and the illumination of the display screen is controlled automatically by using a control circuit so as to present a soft light which is warm to the visual sense. Moreover, the automatically illumination control device has the advantages of power saving and long lifetime.
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Cited Art Landscape
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