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Liquid crystal device and driving method therefor

Assignee: Canon Inc
•
Filing: 1994-12-02
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Granted: 1997-12-02
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Expires: 2014-12-02
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Abstract

Abstract A liquid crystal device of active matrix type includes a layer of a liquid crystal material and a plurality of unit cells each provided with an active element. The device further includes signal lines for supplying signals for determining an optical state of the liquid crystal material, and a circuit for maintaining the signal lines at a certain reference potential during a period other than a period in which signals are supplied to the unit cells.

Inventors

  • 👤 Shigeki Kondo
  • 👤 Shigetoshi Sugawa
  • 👤 Tetsunobu Kohchi

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-08 06:42
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3648; G09G3/3651; G09G3/3685; G09G3/3688; G09G2310/00; G09G2310/02; G09G2310/0243; G09G2310/0248; G09G2310/0251; G09G2310/06; G09G2310/061; G09G2320/00; G09G2320/02; G09G2320/0209; G09G2320/0214; G09G2320/0219; G09G3/2007; G09G3/2011

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 172 words
A driving method for driving an active matrix type liquid crystal display device by a signal having a period in which an image signal is present and a blanking period which alternately repeats with the period in which the image signal is present, the display comprising: a plurality of unit cells each of which having: (i) an active element, (ii) a pixel electrode, and (iii) a liquid crystal material, the unit cells being arranged in a matrix form comprising a plurality of rows; and a plurality of signal lines for supplying signal voltage to the unit cells, the method comprising the steps of: (a) supplying an image signal voltage to the unit cells during a part of the blanking period; and (b) after supplying the image signal voltage to the unit cells, and during a period before a termination of the blanking period, supplying a reset voltage to the signal lines, the period for supplying the reset voltage continuing for a time sufficient to charge a parasitic capacitance of the signal lines.
Claim 2
Dependent Claim 172 words
A driving method for driving an active matrix type liquid crystal display device by a signal having a period in which an image signal is present and a blanking period which alternately repeats with the period in which the image signal is present, the display comprising: a plurality of unit cells each of which having: (i) an active element, (ii) a pixel electrode, and (iii) a liquid crystal material, the unit cells being arranged in a matrix form comprising a plurality of rows; and a plurality of signal lines for supplying signal voltage to the unit cells, the method comprising the steps of: (a) supplying an image signal voltage to the unit cells during a part of the blanking period; and (b) after supplying the image signal voltage to the unit cells, and during a period before a termination of the blanking period, supplying a reset voltage to the signal lines, the period for supplying the reset voltage continuing for a time sufficient to charge a parasitic capacitance of the signal lines.
Claim 3
Dependent Claim 15 words
A method according to claim 1, wherein the active element comprises a thin film transistor.

References Cited (Backward Citations)

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USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 2000-12-01 2001-06-02 2001-12-02 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2004-12-01 2005-06-02 2005-12-02 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2008-12-01 2009-06-02 2009-12-02 $7700.00 Window Closed / Lapsed

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