US PATENT SUBCLASS 349 / 70
.~.~ Fluorescent light source

Current as of: June, 1999
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349 /   HD   LIQUID CRYSTAL CELLS, ELEMENTS AND SYSTEMS

56  DF  PARTICULAR STRUCTURE {7}
61  DF  .~ Particular illumination {4}
70.~.~ Fluorescent light source {1}
71  DF  .~.~.~> Formed of planar phosphor or fluorescent layer separate from illumination source

DEFINITION

Classification: 349/70

Fluorescent light source:

(under subclass 61) Subject matter wherein the liquid crystal device is lit by a tube containing mercury vapor, lined with phosphor which emits light in response to passage of a current, or a phosphorescent layer not driven by electrodes.

(1) Note. Included herein are apparatus having fluorescent bulbs and layers which emit fluorescent light when illuminated with a light source.

(2) Note. Excluded from this subclass are fluorescent layers which are driven by electrodes, or electroluminescent light sources. For such excluded subject matter, see SEARCH THIS CLASS, SUBCLASS below.

SEE OR SEARCH THIS CLASS, SUBCLASS:

69, for the use of fluorescent layers which are driven by electrodes or electroluminescent light sources in a liquid

crystal device.