Patent US6313819B1 successfully refreshed from Google Patents.
US6313819B1
Expired / Lapsed
US
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Liquid crystal display device
Assignee: Sony Corp
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Filing: 1998-08-28
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Granted: 2001-11-06
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Expires: 2018-08-28
Abstract
Abstract In a source follower circuit having an NMOS source follower transistor with a drain thereof connected to a power supply and a current supply connected across the source of this transistor and earth, one end of a capacitor is connected to the gate of the transistor, the first analog switch is connected across the gate of the transistor and a precharge supply, the second analog switch is connected across the other end of the capacitor and the source of the transistor, and the third analog switch is connected across the other end of the capacitor and a signal source.
Inventors
- 👤 Toshikazu Maekawa
- 👤 Yoshiharu Nakajima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:50
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/2007; G09G3/2011; G09G3/34; G09G3/36; G09G3/3611; G09G3/3685; G09G3/3688; G09G2310/00; G09G2310/02; G09G2310/0243; G09G2310/0248; G09G2310/0264; G09G2310/027; G09G2310/0291
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
115 words
A liquid crystal display device comprising: a source follower transistor in a connection used as a source follower; a capacitor with one end connected to the gate of said source follower transistor; a precharge supply; a first analog switch connected across said gate of said source follower transistor and said precharge supply; a second analog switch connected across the other end of said capacitor and the source of said source follower transistor, and operated simultaneously with said first analog switch; and a third analog switch connected across a signal source and the other end of said capacitor, and operated in reverse with respect to opening and closing operations of said first and second analog switches.
Claim 2
Dependent Claim
115 words
A liquid crystal display device comprising: a source follower transistor in a connection used as a source follower; a capacitor with one end connected to the gate of said source follower transistor; a precharge supply; a first analog switch connected across said gate of said source follower transistor and said precharge supply; a second analog switch connected across the other end of said capacitor and the source of said source follower transistor, and operated simultaneously with said first analog switch; and a third analog switch connected across a signal source and the other end of said capacitor, and operated in reverse with respect to opening and closing operations of said first and second analog switches.
Claim 3
Dependent Claim
20 words
The liquid crystal display device of claim 1 , wherein said source follower transistor is a polysilicon thin film transistor.
Claim 4
Dependent Claim
49 words
The liquid crystal display device of claim 1 , wherein said first and second analog switches are turned on during a precharge period and turned off during an output period, and said third analog switch is turned off during said precharge period and turned on during said output period.
Claim 5
Dependent Claim
40 words
The liquid crystal display device of claim 1 further comprising a cascode connected transistor cascode connected to the drain side of said source follower transistor with a gate side thereof connected to said gate side of said source follower transistor.
Claim 6
Dependent Claim
52 words
The liquid crystal display device of claim 4 further comprising a transistor of an opposite conduction type to the conduction type of said cascode connected transistor, said transistor having a source connected to said gate of said cascode connected transistor and a gate connected to said gate of said source follower transistor.
Claim 7
Dependent Claim
19 words
The liquid crystal display device of claim 4 , wherein said cascode connected transistor is a depletion type transistor.
Claim 8
Dependent Claim
58 words
The liquid crystal display device of claim 4 further comprising: a capacitor connected across said gate of said source follower transistor and said gate of said cascode connected transistor; and a fourth analog switch connected across said gate of said cascode connected transistor and a prescribed electric source, and operated simultaneously with said first and second analog switches.
Claim 9
Dependent Claim
131 words
A liquid crystal display device comprising a plurality of output buffers for driving respective column lines, each of said output buffers comprising: a source follower transistor in a connection used as a source follower; a capacitor with one end connected to the gate of a source follower transistor; a precharge supply; a first analog switch connected across said gate of said source follower transistor and said precharge supply; a second analog switch connected across the other end of said capacitor and the source of said source follower transistor, and operated simultaneously with said first analog switch; and a third analog switch connected across a signal source and the other end of said capacitor, and operated in reverse with respect to opening and closing operations of said first and second analog switches.
Claim 10
Dependent Claim
131 words
A liquid crystal display device comprising a plurality of output buffers for driving respective column lines, each of said output buffers comprising: a source follower transistor in a connection used as a source follower; a capacitor with one end connected to the gate of a source follower transistor; a precharge supply; a first analog switch connected across said gate of said source follower transistor and said precharge supply; a second analog switch connected across the other end of said capacitor and the source of said source follower transistor, and operated simultaneously with said first analog switch; and a third analog switch connected across a signal source and the other end of said capacitor, and operated in reverse with respect to opening and closing operations of said first and second analog switches.
Claim 11
Dependent Claim
76 words
The liquid crystal display device of claim 8 further comprising a DA converter of a reference voltage selection type for upper bits and a DC converter of a switched capacitor array type for lower bits, both of said DA converters being provided at a stage previous to said output buffers, and said DA converter of said switched capacitor array type having capacitors being shared as said capacitor connected to the gate of said source follower transistor.
Claim 12
Dependent Claim
40 words
The liquid crystal display device of claim 8 further comprising a cascode connected transistor cascode connected to said drain side of said source follower transistor with a gate side thereof connected to said gate side of said source follower transistor.
Claim 13
Dependent Claim
76 words
The liquid crystal display device of claim 10 further comprising a DA converter of a reference voltage selection type for upper bits and a DA converter of a switched capacitor array type for lower bits, both of said DA converters being provided at a stage previous to said output circuit, and said DA converter of said switched capacitor array type having capacitors being shared as said capacitor connected to the gate of said source follower transistor.
Claim 14
Dependent Claim
58 words
The liquid crystal display device of claim 10 further comprising: a capacitor connected across said gate of said source follower transistor and said gate of said cascode connected transistor; and a fourth analog switch connected across said gate of said cascode connected transistor and a prescribed electric supply, and operated simultaneously with said first and second analog switches.
Claim 15
Dependent Claim
76 words
The liquid crystal display device of claim 12 further comprising a DA converter of a reference voltage selection type for upper bits and a DA converter of a switched capacitor array type for lower bits, both of said DA converters being provided at a stage previous to said output circuit, and said DA converter of said switched capacitor array type having capacitors being shared as said capacitor connected to the gate of said source follower transistor.
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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) | 2004-11-05 | 2005-05-07 | 2005-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-11-05 | 2009-05-07 | 2009-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-11-05 | 2013-05-07 | 2013-11-06 | $7700.00 | Window Closed / Lapsed |