US5402142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drive circuit for display apparatus
Assignee: Sharp Corp
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Filing: 1992-08-21
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Granted: 1995-03-28
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Expires: 2012-08-21
Abstract
Abstract A drive circuit for a display apparatus includes an input section for receiving a digital video signal, a voltage supply section for generating a common electrode voltage and a plurality of gradation voltages, a driving section for selecting one of the plurality of gradation voltages according to the input digital video signal and applying the selected gradation voltage to one of the pixel electrodes, and for applying the common electrode voltage to the common electrode, the common electrode voltage being shifted based on a certain relationship so that a central value of the common electrode voltage is different from central values of the gradation voltages.
Inventors
- 👤 Hisao Okada
- 👤 Yuji Yamamoto
- 👤 Tadatsugu Nishitani
- 👤 Toshihiro Yanagi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:51
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; H; H04; H04N; H04N3/00; H04N3/10; H04N3/12; H04N3/127; G09G3/3611; G09G3/3648; G09G3/3655; G09G3/3685; G09G3/3688; G09G3/3696; G09G2310/00; G09G2310/02; G09G2310/0264; G09G2310/027; G09G2320/00; G09G2320/02; G09G2320/0204; G09G2320/0219; G09G2320/0247; G09G3/2007; G09G3/2011; G09G3/3614
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
183 words
A drive circuit for a display apparatus having a display panel which includes a plurality of pixels, pixel electrodes and a common electrode for driving said plurality of pixels, said drive circuit comprising: means for receiving a digital video signal; voltage supply means for generating a common electrode voltage and a plurality of gradation voltages, each of said plurality of gradation voltages alternately changing between two voltage levels, said gradation voltages having one central value which is equal to a central value of said common electrode voltage; and driving means for selecting one of said plurality of gradation voltages according to said input digital video signal and applying the selected gradation voltage to one of said pixel electrodes, and for applying said common electrode voltage to said common electrode; said voltage supply means including shifting means for shifting said common electrode voltage, based on transmissivity characteristics of said pixels of said display panel as a function of voltage applied to said pixel electrodes so that said central value of said common electrode voltage is different from said central value of said gradation voltages.
Claim 2
Dependent Claim
183 words
A drive circuit for a display apparatus having a display panel which includes a plurality of pixels, pixel electrodes and a common electrode for driving said plurality of pixels, said drive circuit comprising: means for receiving a digital video signal; voltage supply means for generating a common electrode voltage and a plurality of gradation voltages, each of said plurality of gradation voltages alternately changing between two voltage levels, said gradation voltages having one central value which is equal to a central value of said common electrode voltage; and driving means for selecting one of said plurality of gradation voltages according to said input digital video signal and applying the selected gradation voltage to one of said pixel electrodes, and for applying said common electrode voltage to said common electrode; said voltage supply means including shifting means for shifting said common electrode voltage, based on transmissivity characteristics of said pixels of said display panel as a function of voltage applied to said pixel electrodes so that said central value of said common electrode voltage is different from said central value of said gradation voltages.
Claim 3
Dependent Claim
22 words
A drive circuit for a display apparatus according to claim 1, wherein said common electrode voltage alternately changes between two voltage levels.
Claim 4
Dependent Claim
20 words
A drive circuit for a display apparatus according to claim 1, wherein said common electrode voltage is a d.c. voltage.
Claim 5
Dependent Claim
74 words
A drive circuit for a display apparatus according to claim 1, wherein said voltage supply means includes means for shifting at least one of said gradation voltages based on said transmissivity characteristics of said pixels of said display panel as a function of voltage applied to said pixel electrodes so that a central value of said at least one of said gradation voltages is different from said central value of said remaining gradation voltages.
Claim 6
Dependent Claim
17 words
A drive circuit according to claim 1, wherein said shifting means variably shifts said common electrode voltage.
Claim 7
Dependent Claim
194 words
A drive circuit for a display apparatus having a display panel which includes a plurality of pixels, pixel electrodes and a common electrode for driving said plurality of pixels, said drive circuit comprising: means for receiving a digital video signal; voltage supply means for generating a common electrode voltage and a plurality of gradation voltages, each of said plurality of gradation voltages alternately changing between two voltage levels, said gradation voltages having one central value which is equal to a central value of said common electrode voltage; and driving means for selecting one of said plurality of gradation voltages according to said input digital video signal and applying the selected gradation voltage to one of said pixel electrodes, and for applying said common electrode voltage to said common electrode; said voltage supply means including means for shifting means for shifting at least one of said gradation voltages, based on transmissivity characteristics of said pixels of said display panel as a function of voltage applied to said pixel electrodes so that said central value of said at least one of said gradation voltages is different from one of central values of said remaining gradation voltages.
Claim 8
Dependent Claim
194 words
A drive circuit for a display apparatus having a display panel which includes a plurality of pixels, pixel electrodes and a common electrode for driving said plurality of pixels, said drive circuit comprising: means for receiving a digital video signal; voltage supply means for generating a common electrode voltage and a plurality of gradation voltages, each of said plurality of gradation voltages alternately changing between two voltage levels, said gradation voltages having one central value which is equal to a central value of said common electrode voltage; and driving means for selecting one of said plurality of gradation voltages according to said input digital video signal and applying the selected gradation voltage to one of said pixel electrodes, and for applying said common electrode voltage to said common electrode; said voltage supply means including means for shifting means for shifting at least one of said gradation voltages, based on transmissivity characteristics of said pixels of said display panel as a function of voltage applied to said pixel electrodes so that said central value of said at least one of said gradation voltages is different from one of central values of said remaining gradation voltages.
Claim 9
Dependent Claim
22 words
A drive circuit for a display apparatus according to claim 6, wherein said common electrode voltage alternately changes between two voltage levels.
Claim 10
Dependent Claim
20 words
A drive circuit for a display apparatus according to claim 6, wherein said common electrode voltage is a d.c. voltage.
Claim 11
Dependent Claim
20 words
A drive circuit according to claim 6, wherein said shifting means variably shifts at least one of said gradation voltage.
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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) | 1998-03-27 | 1998-09-26 | 1999-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-27 | 2002-09-26 | 2003-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-27 | 2006-09-26 | 2007-03-28 | $7700.00 | Window Closed / Lapsed |