US PATENT SUBCLASS 349 / 33
.~ Electrical excitation of liquid crystal (i.e., particular voltage pulses, AC vs. DC, threshold voltages, etc.)

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.~ Electrical excitation of liquid crystal (i.e., particular voltage pulses, AC vs. DC, threshold voltages, etc.) {8}
34  DF  .~.~> With application of holding or bias voltage (i.e., voltage which does not change the optical state of the liquid crystal)
35  DF  .~.~> For driving Grandjean to focal conic or dynamic scattering type liquid crystal
36  DF  .~.~> Including diverse driving frequencies
37  DF  .~.~> Polarity based driving
38  DF  .~.~> With supplemental capacitor {1}
40  DF  .~.~> With antistatic elements
41  DF  .~.~> With particular switching device {2}
54  DF  .~.~> Matrix including additional element (s) which correct or compensate for electrical fault {1}

DEFINITION

Classification: 349/33

Electrical excitation of liquid crystal (i.e., particular voltage pulses, AC vs. DC, threshold voltages, etc.):

(under subclass 19) Subject matter wherein an optical property of the liquid crystal material is changed by the application of an electric potential or current to the liquid crystal material.

(1) Note. Nominal driving subject matter which depends on details of liquid crystal cell structure is classified in this subclass. Excluded from this subclass is driving of a liquid crystal device with a nominal liquid crystal cell structure. For such excluded subject matter, see SEARCH CLASS below.

SEE OR SEARCH CLASS

345, Computer Graphics Processing, Operator Interface Processing, and Selective Visual Display Systems,

38+, and 87+ for driving of a liquid crystal device.