US5798746A
Expired / Lapsed
US
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Liquid crystal display device
Assignee: Semiconductor Energy Laboratory Co Ltd
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Filing: 1994-12-23
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Granted: 1998-08-25
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Expires: 2014-12-23
Abstract
Abstract In an active matrix type liquid crystal display device, a time gradation display manner for performing time gradation display is used. A digital gradation (voltage) signal on a signal line is supplied to the digital memory circuit arranged in vicinity of each pixel electrode and stored therein for a desired period of time. This storage state is held until next scanning is started. A high voltage or a low voltage supplied as a power source voltage of the digital memory circuit is applied to a pixel electrode while the digital memory circuit is in a storage state, so that a desired voltage is stably applied to the pixel electrode.
Inventors
- 👤 Jun Koyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:41
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3696; G09G3/2007; G09G3/2011; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/136; G02F1/1362; G02F1/13624; G09G3/3648; G09G3/3685; G09G3/3688; G09G2300/00; G09G2300/08; G09G2300/0809; G09G2300/0842; G09G2300/0857; G09G2310/00; G09G2310/02; G09G2310/0264; G09G2310/027; G09G2320/00; G09G2320/02; G09G2320/0219; G09G3/2014; G09G3/3674; G09G3/3677
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
109 words
A liquid crystal display device comprising: first and second substrates each having an insulating surface; at least one pixel electrode arranged on the first substrate at a matrix form; an opposite electrode arranged on the second substrate; a liquid crystal disposed between the first and second substrates; and at least one digital memory circuit which is constructed by thin film transistors, wherein the digital memory circuit is connected with the pixel electrode and stores a binary information; wherein a voltage is directly applied to said pixel electrode through said digital memory circuit based on said binary information, wherein said liquid crystal display device includes a time gradation display device.
Claim 2
Dependent Claim
109 words
A liquid crystal display device comprising: first and second substrates each having an insulating surface; at least one pixel electrode arranged on the first substrate at a matrix form; an opposite electrode arranged on the second substrate; a liquid crystal disposed between the first and second substrates; and at least one digital memory circuit which is constructed by thin film transistors, wherein the digital memory circuit is connected with the pixel electrode and stores a binary information; wherein a voltage is directly applied to said pixel electrode through said digital memory circuit based on said binary information, wherein said liquid crystal display device includes a time gradation display device.
Claim 3
Dependent Claim
29 words
The device of claim 1 wherein a voltage having an amplitude equivalent to that of the voltage stored in the digital memory circuit is supplied to the opposite electrode.
Claim 4
Dependent Claim
20 words
The device of claim 1 wherein the number of pixel electrodes equals to the number of the digital memory circuit.
Claim 5
Dependent Claim
17 words
The device of claim 1 wherein the liquid crystal display device includes a digital gradation display device.
Claim 6
Dependent Claim
18 words
The device of claim 1 wherein the voltage includes one of a high voltage and a low voltage.
Claim 7
Dependent Claim
166 words
An active matrix display device having an electro-optical modulating layer disposed between a pair of substrate, said active matrix display device comprising: a plurality of column lines and a plurality of row lines supported by one of the substrates and defining a plurality of pixels in a matrix form; a plurality of pixel electrodes formed in said plurality of pixels and supported by said one of said substrates; a thin film transistor disposed in each of said pixels and electrically connected to one of said column lines and one of said row lines; a memory circuit disposed in each of said pixels and electrically connected to said thin film transistor, wherein said memory circuit stores an information output by said thin film transistor; and at least two signal lines electrically connected to said memory circuit and the corresponding pixel electrode, wherein different voltages are applied to said pixel electrode through said at least two signal lines based on the information stored by the corresponding memory circuit.
Claim 8
Dependent Claim
166 words
An active matrix display device having an electro-optical modulating layer disposed between a pair of substrate, said active matrix display device comprising: a plurality of column lines and a plurality of row lines supported by one of the substrates and defining a plurality of pixels in a matrix form; a plurality of pixel electrodes formed in said plurality of pixels and supported by said one of said substrates; a thin film transistor disposed in each of said pixels and electrically connected to one of said column lines and one of said row lines; a memory circuit disposed in each of said pixels and electrically connected to said thin film transistor, wherein said memory circuit stores an information output by said thin film transistor; and at least two signal lines electrically connected to said memory circuit and the corresponding pixel electrode, wherein different voltages are applied to said pixel electrode through said at least two signal lines based on the information stored by the corresponding memory circuit.
Claim 9
Dependent Claim
43 words
The active matrix display device of claim 6 further comprising an opposite electrode on the other of said substrates, wherein an AC voltage having an amplitude equivalent to that of the voltages output of the memory circuit is supplied to the opposite electrode.
Claim 10
Dependent Claim
22 words
The active matrix display device of claim 6 wherein the number of pixel electrodes equals to the number of the memory circuit.
Claim 11
Dependent Claim
20 words
The active matrix display device of claim 6 wherein the active matrix display device includes a digital gradation display device.
Claim 12
Dependent Claim
20 words
The active matrix display device of claim 6 wherein the active matrix display device includes a time gradation display device.
Claim 13
Dependent Claim
20 words
The active matrix display device of claim 6 wherein the different voltages include a high voltage and a low voltage.
Claim 14
Dependent Claim
289 words
An active matrix display device having an electro-optical modulating layer disposed between a pair of substrate, said active matrix display device comprising: a plurality of column lines and a plurality of row lines supported by one of the substrates and defining a plurality of pixels in a matrix form; a plurality of pixel electrodes formed in said plurality of pixels and supported by said one of said substrates; a first thin film transistor disposed in each of said pixels and electrically connected to one of said column lines and one of said row lines; a memory circuit disposed in each of said pixels and electrically connected to said first thin film transistor, wherein said memory circuit stores an information output by said first thin film transistor; and at least two signal lines electrically connected to said memory circuit and the corresponding pixel electrode, wherein different voltages are applied to said pixel electrode through said at least two signal lines based on the information stored by the corresponding memory circuit, and wherein said memory circuit comprises at least second and third thin film transistors, one of source or drain of the second thin film transistor being connected with one of said signal lines, a gate electrode of the third thin film transistor, and one of source or drain of the first thin film transistor, the other of source or drain of the second transistor being connected with the other of said signal lines and one of source or drain of the third thin film transistor, and a gate electrode of the second thin film transistor being connected with the other of source or drain of the third thin film transistor, one of said signal lines, and said electro-optical modulating layer.
Claim 15
Dependent Claim
289 words
An active matrix display device having an electro-optical modulating layer disposed between a pair of substrate, said active matrix display device comprising: a plurality of column lines and a plurality of row lines supported by one of the substrates and defining a plurality of pixels in a matrix form; a plurality of pixel electrodes formed in said plurality of pixels and supported by said one of said substrates; a first thin film transistor disposed in each of said pixels and electrically connected to one of said column lines and one of said row lines; a memory circuit disposed in each of said pixels and electrically connected to said first thin film transistor, wherein said memory circuit stores an information output by said first thin film transistor; and at least two signal lines electrically connected to said memory circuit and the corresponding pixel electrode, wherein different voltages are applied to said pixel electrode through said at least two signal lines based on the information stored by the corresponding memory circuit, and wherein said memory circuit comprises at least second and third thin film transistors, one of source or drain of the second thin film transistor being connected with one of said signal lines, a gate electrode of the third thin film transistor, and one of source or drain of the first thin film transistor, the other of source or drain of the second transistor being connected with the other of said signal lines and one of source or drain of the third thin film transistor, and a gate electrode of the second thin film transistor being connected with the other of source or drain of the third thin film transistor, one of said signal lines, and said electro-optical modulating layer.
Claim 16
Dependent Claim
24 words
The active matrix display device of claim 12 wherein a voltage supplied to the the electro-optical modulating layer is substantially zero on time average.
Claim 17
Dependent Claim
22 words
The active matrix display device of claim 12 wherein the number of pixel electrodes equals to the number of the memory circuit.
Claim 18
Dependent Claim
20 words
The active matrix display device of claim 12 wherein the active matrix display device includes a digital gradation display device.
Claim 19
Dependent Claim
20 words
The active matrix display device of claim 12 wherein the active matrix display device includes a time gradation display device.
Claim 20
Dependent Claim
20 words
The active matrix display device of claim 12 wherein the different voltages include a high voltage and a low voltage.
Claim 21
Dependent Claim
195 words
An active matrix display device having an electro-optical modulating layer disposed between a pair of substrate, said active matrix display device comprising: a plurality of column lines and a plurality of row lines supported by one of the substrates and defining a plurality of pixels in a matrix form; a plurality of pixel electrodes formed in said plurality of pixels and supported by said one of said substrates; a first thin film transistor disposed in each of said pixels and electrically connected to one of said column lines and one of said row lines; a memory circuit disposed in each of said pixels and electrically connected to said first thin film transistor, wherein said memory circuit stores an information output by said first thin film transistor; and at least two signal lines electrically connected to said memory circuit and the corresponding pixel electrode, wherein different voltages are applied to said pixel electrode through said at least two signal lines based on the information stored by the corresponding memory circuit, and wherein said memory circuit comprises at least two invertors, said invertors comprising at least two thin film transistors and being connected with said signal lines.
Claim 22
Dependent Claim
195 words
An active matrix display device having an electro-optical modulating layer disposed between a pair of substrate, said active matrix display device comprising: a plurality of column lines and a plurality of row lines supported by one of the substrates and defining a plurality of pixels in a matrix form; a plurality of pixel electrodes formed in said plurality of pixels and supported by said one of said substrates; a first thin film transistor disposed in each of said pixels and electrically connected to one of said column lines and one of said row lines; a memory circuit disposed in each of said pixels and electrically connected to said first thin film transistor, wherein said memory circuit stores an information output by said first thin film transistor; and at least two signal lines electrically connected to said memory circuit and the corresponding pixel electrode, wherein different voltages are applied to said pixel electrode through said at least two signal lines based on the information stored by the corresponding memory circuit, and wherein said memory circuit comprises at least two invertors, said invertors comprising at least two thin film transistors and being connected with said signal lines.
Claim 23
Dependent Claim
22 words
The active matrix display device of claim 18 wherein the number of pixel electrodes equals to the number of the memory circuit.
Claim 24
Dependent Claim
20 words
The active matrix display device of claim 18 wherein the active matrix display device includes a digital gradation display device.
Claim 25
Dependent Claim
20 words
The active matrix display device of claim 18 wherein the active matrix display device includes a time gradation display device.
Claim 26
Dependent Claim
20 words
The active matrix display device of claim 18 wherein the different voltages include a high voltage and a low voltage.
Claim 27
Dependent Claim
43 words
The active matrix display device of claim 18 further comprising an opposite electrode on the other of said substrates, wherein an AC voltage having an amplitude equivalent to that of the voltages output of the memory circuit is supplied to the opposite electrode.
Claim 28
Dependent Claim
185 words
An active matrix display device having an electro-optical modulating layer disposed between a pair of substrate, said active matrix display device comprising: a plurality of column lines and a plurality of row lines supported by one of the substrates and defining a plurality of pixels in a matrix form; a plurality of pixel electrodes formed in said plurality of pixels and supported by said one of said substrates; first thin film transistor disposed in each of said pixels and electrically connected to one of said column lines and one of said row lines; a memory circuit disposed in each of said pixels and electrically connected to said first thin film transistor, wherein said memory circuit stores an information output by said first thin film transistor; and at least two signal lines electrically connected to said memory circuit and the corresponding pixel electrode, wherein different voltages are applied to said pixel electrode through said at least two signal lines based on the information stored by the corresponding memory circuit, and wherein said memory circuit comprises at least two thin film transistors, having a same conductivity type.
Claim 29
Dependent Claim
185 words
An active matrix display device having an electro-optical modulating layer disposed between a pair of substrate, said active matrix display device comprising: a plurality of column lines and a plurality of row lines supported by one of the substrates and defining a plurality of pixels in a matrix form; a plurality of pixel electrodes formed in said plurality of pixels and supported by said one of said substrates; first thin film transistor disposed in each of said pixels and electrically connected to one of said column lines and one of said row lines; a memory circuit disposed in each of said pixels and electrically connected to said first thin film transistor, wherein said memory circuit stores an information output by said first thin film transistor; and at least two signal lines electrically connected to said memory circuit and the corresponding pixel electrode, wherein different voltages are applied to said pixel electrode through said at least two signal lines based on the information stored by the corresponding memory circuit, and wherein said memory circuit comprises at least two thin film transistors, having a same conductivity type.
Claim 30
Dependent Claim
23 words
The active matrix display device of claim 24 wherein a voltage supplied to the electro-optical modulating layer is substantially zero on time average.
Claim 31
Dependent Claim
22 words
The active matrix display device of claim 24 wherein the number of pixel electrodes equals to the number of the memory circuit.
Claim 32
Dependent Claim
20 words
The active matrix display device of claim 24 wherein the active matrix display device includes a digital gradation display device.
Claim 33
Dependent Claim
20 words
The active matrix display device of claim 24 wherein the active matrix display device includes a time gradation display device.
Claim 34
Dependent Claim
20 words
The active matrix display device of claim 24 wherein the different voltages include a high voltage and a low 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) | 2001-08-24 | 2002-02-23 | 2002-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-08-24 | 2006-02-23 | 2006-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-08-24 | 2010-02-23 | 2010-08-25 | $7700.00 | Window Closed / Lapsed |