US6597349B1
Expired / Lapsed
US
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Semiconductor display device and method of driving the same
Assignee: Semiconductor Energy Laboratory Co Ltd
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Filing: 1998-09-29
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Granted: 2003-07-22
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Expires: 2018-09-29
Abstract
Abstract In a driving circuit of a digital gradation system semiconductor display device, one D/A conversion circuit 208 is provided for a plurality of source signal lines, and the respective source signal lines are driven in a time-division manner. By this, the number of the D/A conversion circuits 208 in the driving circuit can be decreased, and miniaturization of the semiconductor display device can be achieved.
Inventors
- 👤 Jun Koyama
- 👤 Mitsuaki Osame
- 👤 Munehiro Azami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:38
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3685; G09G3/3688; G09G2310/00; G09G2310/02; G09G2310/0264; G09G2310/027; G09G2310/0289; G09G2310/0297; G09G3/2007; G09G3/2011
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
142 words
A display device, comprising: a memory circuit for storing m x-bit digital gradation signals (m and x are natural numbers); and a D/A conversion circuit portion for converting said m x-bit digital gradation signals supplied from said memory circuit into analog signals and for supplying said analog signals to m source signal lines, said D/A conversion circuit portion comprising n D/A conversion circuits where n is a natural number, wherein input of each of said n D/A conversion circuits is connected with outputs of m/n x-input NANDs, wherein each of inputs of said x-input NANDs is connected with an output of y-input NAND where y is two or more, and wherein each of said n D/A conversion circuits sequentially converts the m/n x-bit digital gradation signals into m/n analog signals to supply said m/n analog signals to corresponding m/n source signal lines.
Claim 2
Dependent Claim
142 words
A display device, comprising: a memory circuit for storing m x-bit digital gradation signals (m and x are natural numbers); and a D/A conversion circuit portion for converting said m x-bit digital gradation signals supplied from said memory circuit into analog signals and for supplying said analog signals to m source signal lines, said D/A conversion circuit portion comprising n D/A conversion circuits where n is a natural number, wherein input of each of said n D/A conversion circuits is connected with outputs of m/n x-input NANDs, wherein each of inputs of said x-input NANDs is connected with an output of y-input NAND where y is two or more, and wherein each of said n D/A conversion circuits sequentially converts the m/n x-bit digital gradation signals into m/n analog signals to supply said m/n analog signals to corresponding m/n source signal lines.
Claim 3
Dependent Claim
17 words
A device according to claim 1 , wherein the memory circuit includes a plurality of latch circuits.
Claim 4
Dependent Claim
23 words
A device according to claim 1 wherein each of said n D/A conversion circuits comprises a thin film transistor provided over a substrate.
Claim 5
Dependent Claim
17 words
A device according to claim 3 further comprising a pixel thin film transistor provided over said substrate.
Claim 6
Dependent Claim
15 words
A device according to claim 1 wherein said display device is a liquid crystal display.
Claim 7
Dependent Claim
14 words
A device according to claim 1 wherein said display device is an electroluminescence display.
Claim 8
Dependent Claim
14 words
A device according to claim 1 wherein said display device is an electrochromism display.
Claim 9
Dependent Claim
16 words
A device according to claim 1 wherein said display device is incorporated into a video camera.
Claim 10
Dependent Claim
16 words
A device according to claim 1 wherein said display device is incorporated into a still camera.
Claim 11
Dependent Claim
15 words
A device according to claim 1 wherein said display device is incorporated into a projector.
Claim 12
Dependent Claim
17 words
A device according to claim 1 wherein said display device is incorporated into a head mount display.
Claim 13
Dependent Claim
17 words
A device according to claim 1 wherein said display device is incorporated into a car navigation system.
Claim 14
Dependent Claim
16 words
A device according to claim 1 wherein said display device is incorporated into a personal computer.
Claim 15
Dependent Claim
17 words
A device according to claim 1 wherein said display device is incorporated into a portable information terminal.
Claim 16
Dependent Claim
16 words
A device according to claim 1 wherein said display device is incorporated into a mobile computer.
Claim 17
Dependent Claim
16 words
A device according to claim 1 wherein said display device is incorporated into a portable telephone.
Claim 18
Dependent Claim
14 words
A device according to claim 1 wherein said memory circuit comprises a latch circuit.
Claim 19
Independent Claim
82 words
A method of driving a display device comprising: storing m x-bit digital gradation signals where m and x are natural numbers; sequentially converting the m/n x-bit digital gradation signals into m/n analog signals in one line period by each of n D/A conversion circuits to supply said m/n analog signals to corresponding m/n source signal lines where n is a natural number, wherein said n D/A conversion circuits supplies the n analog signals to n source signal lines in a same timing.
Claim 20
Independent Claim
82 words
A method of driving a display device comprising: storing m x-bit digital gradation signals where m and x are natural numbers; sequentially converting the m/n x-bit digital gradation signals into m/n analog signals in one line period by each of n D/A conversion circuits to supply said m/n analog signals to corresponding m/n source signal lines where n is a natural number, wherein said n D/A conversion circuits supplies the n analog signals to n source signal lines in a same timing.
Claim 21
Dependent Claim
23 words
A method according to claim 18 wherein each of said n D/A conversion circuits comprises a thin film transistor provided over a substrate.
Claim 22
Dependent Claim
17 words
A method according to claim 19 further comprising a pixel thin film transistor provided over said substrate.
Claim 23
Dependent Claim
15 words
A method according to claim 18 wherein said display device is a liquid crystal display.
Claim 24
Dependent Claim
15 words
A method according to claim 18 wherein said display device is an electrol uminescence display.
Claim 25
Dependent Claim
14 words
A method according to claim 18 wherein said display device is an electrochromism display.
Claim 26
Dependent Claim
42 words
A method according to claim 18 wherein said display device is incorporated into one selected from the group consisting of a portable telephone, a video camera, a mobile computer, a head mount display, a rear type projector, and a front type projector.
Claim 27
Independent Claim
88 words
A method of driving a display device comprising: sampling and storing m x-bit digital gradation signals by a timing signal from a shift register where m and x are natural numbers; sequentially converting the m/n x-bit digital gradation signals into m/n analog signals by each of n D/A conversion circuits to supply said m/n analog signals to corresponding m/n source signal lines where n is a natural number, wherein said n D/A conversion circuits supplies the n analog signals to n source signal lines in a same timing.
Claim 28
Independent Claim
88 words
A method of driving a display device comprising: sampling and storing m x-bit digital gradation signals by a timing signal from a shift register where m and x are natural numbers; sequentially converting the m/n x-bit digital gradation signals into m/n analog signals by each of n D/A conversion circuits to supply said m/n analog signals to corresponding m/n source signal lines where n is a natural number, wherein said n D/A conversion circuits supplies the n analog signals to n source signal lines in a same timing.
Claim 29
Dependent Claim
23 words
A method according to claim 25 wherein each of said n D/A conversion circuits comprises a thin film transistor provided over a substrate.
Claim 30
Dependent Claim
17 words
A method according to claim 26 further comprising a pixel thin film transistor provided over said substrate.
Claim 31
Dependent Claim
15 words
A method according to claim 25 wherein said display device is a liquid crystal display.
Claim 32
Dependent Claim
14 words
A method according to claim 25 wherein said display device is an electroluminescence display.
Claim 33
Dependent Claim
14 words
A method according to claim 25 wherein said display device is an electrochromism display.
Claim 34
Dependent Claim
42 words
A method according to claim 25 wherein said display device is incorporated into one selected from the group consisting of a portable telephone, a video camera, a mobile computer, a head mount display, a rear type projector, and a front type projector.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2006-07-21 | 2007-01-20 | 2007-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-07-21 | 2011-01-20 | 2011-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-07-21 | 2015-01-20 | 2015-07-22 | $7700.00 | Window Closed / Lapsed |