US PATENT SUBCLASS 349 / 41
.~.~ With particular switching device

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

19  DF  PARTICULAR EXCITATION OF LIQUID CRYSTAL {6}
33  DF  .~ Electrical excitation of liquid crystal (i.e., particular voltage pulses, AC vs. DC, threshold voltages, etc.) {8}
41.~.~ With particular switching device {2}
42  DF  .~.~.~> Transistor {2}
49  DF  .~.~.~> Two terminal nonlinear switching device (e.g., N-I-N, S-I-S, Ferroelectric, etc.) {3}

DEFINITION

Classification: 349/41

With particular switching device:

(under subclass 33) Subject matter including an electrical device which receives voltages from electrode drivers and toggles a portion of the liquid crystal on and off.

(1) Note. Included here are micromechanical switches used to switch a portion of the liquid crystal on and off.

SEE OR SEARCH CLASS

257, Active Solid-State Devices (e.g., Transistors, Solid-State Diodes), appropriate subclasses for the use of a transistor in general.

345, Selective Visual Display Systems,

90+, for using switching devices in a liquid crystal device.

438, Semiconductor Device Manufacturing: Process, especially 27+, for methods of packaging a semiconductor electronic device having an additional optical component and subclass 30 for methods of making a semiconductor electronic device including a liquid crystal optical component.