US5763899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Active matrix display device
Assignee: Semiconductor Energy Laboratory Co Ltd
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Filing: 1996-02-07
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Granted: 1998-06-09
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Expires: 2016-02-07
Abstract
Abstract In an active matrix display device, a circuit including at least five thin film transistors (TFTs) which are provided with an approximately M-shaped semiconductor region for a single pixel electrode and a gate line and a capacitances line which cross the M-shaped semiconductor region, is used as a switching element. Then, by supplying a selection signal to the gate line, the TFTs are operated, thereby writing data to the pixel, while if a suitable voltage is supplied to the capacitance line, a channel is formed thereunder and it becomes a capacitor. Thus the amount of discharge from the pixel electrode is reduced by this capacitor.
Inventors
- 👤 Shunpei Yamazaki
- 👤 Jun Koyama
- 👤 Yasuhiko Takemura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:30
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/136; G02F1/1362; G02F1/13624; G09; G09G; G09G3/00; G09G3/20; G09G3/22; G09G3/30; G09G3/34; G09G3/36; G09G3/3611; G09G3/3648; H; H10; H10D; H10D30/00; H10D30/60; H10D30/67; H10D30/6729; H10D30/673; H10D30/6733; H10D30/6757; G02F1/136213; G02F1/1368; G09G2300/00; G09G2300/08; G09G2300/0809; H10D30/674
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
155 words
An active matrix display device comprising: image signal lines; gate signal lines, the image signal lines and the gate signal line being formed in a matrix; a capacitance line parallel to said gate signal lines; a pixel electrode; and at least three thin film transistors, said pixel electrode and said at least three thin film transistors being connected in series with each other, wherein one of said three thin film transistors provided in the center of said three thin film transistors is connected to said capacitance line, wherein another one of said three thin film transistors provided at one end of said three thin film transistors is connected to one of said image signal lines and one of said gate signal lines, and wherein another of said three thin film transistors provided at another end of said three thin film transistors is connected to said pixel electrode and said one of the gate signal lines.
Claim 2
Dependent Claim
155 words
An active matrix display device comprising: image signal lines; gate signal lines, the image signal lines and the gate signal line being formed in a matrix; a capacitance line parallel to said gate signal lines; a pixel electrode; and at least three thin film transistors, said pixel electrode and said at least three thin film transistors being connected in series with each other, wherein one of said three thin film transistors provided in the center of said three thin film transistors is connected to said capacitance line, wherein another one of said three thin film transistors provided at one end of said three thin film transistors is connected to one of said image signal lines and one of said gate signal lines, and wherein another of said three thin film transistors provided at another end of said three thin film transistors is connected to said pixel electrode and said one of the gate signal lines.
Claim 3
Dependent Claim
108 words
An active matrix display device comprising: a plurality of image signal lines; a plurality of gate signal lines arranged approximately perpendicular to the image signal lines; a plurality of capacitance lines of which one each is arranged parallel to and between the gate signal lines; pixel electrodes provided in regions surrounded by the gate signal lines and the image signal lines; and switching elements connected to each of the pixel electrodes, wherein each of the switching elements comprises one approximately M-shaped semiconductor film comprising at least three portions overlapped with one of the gate signal lines, and at least two portions overlapped with one of the capacitance lines.
Claim 4
Dependent Claim
108 words
An active matrix display device comprising: a plurality of image signal lines; a plurality of gate signal lines arranged approximately perpendicular to the image signal lines; a plurality of capacitance lines of which one each is arranged parallel to and between the gate signal lines; pixel electrodes provided in regions surrounded by the gate signal lines and the image signal lines; and switching elements connected to each of the pixel electrodes, wherein each of the switching elements comprises one approximately M-shaped semiconductor film comprising at least three portions overlapped with one of the gate signal lines, and at least two portions overlapped with one of the capacitance lines.
Claim 5
Dependent Claim
134 words
An active matrix display apparatus comprising: a plurality of image signal lines; a plurality of gate signal lines arranged approximately perpendicular to the image signal lines; a plurality of capacitance lines of which one each is arranged parallel to and between the gate signal lines; pixel electrodes provided in regions surrounded by the gate signal lines and image signal lines; and switching elements connected to each of the pixel electrodes, wherein each of the switching elements comprises one approximately M-shaped semiconductor film comprising a region which is in contact with one of the image signal lines, a region which is in contact with the pixel electrodes, and at least four regions which are divided by the capacitor lines and the gate signal lines, all of the regions having a N-type or P-type conductivity type.
Claim 6
Dependent Claim
134 words
An active matrix display apparatus comprising: a plurality of image signal lines; a plurality of gate signal lines arranged approximately perpendicular to the image signal lines; a plurality of capacitance lines of which one each is arranged parallel to and between the gate signal lines; pixel electrodes provided in regions surrounded by the gate signal lines and image signal lines; and switching elements connected to each of the pixel electrodes, wherein each of the switching elements comprises one approximately M-shaped semiconductor film comprising a region which is in contact with one of the image signal lines, a region which is in contact with the pixel electrodes, and at least four regions which are divided by the capacitor lines and the gate signal lines, all of the regions having a N-type or P-type conductivity type.
Claim 7
Dependent Claim
138 words
An active matrix display device comprising: a plurality of image signal lines; a plurality of gate signal lines arranged approximately perpendicular to the image signal lines; a plurality of capacitance lines of which one each is arranged parallel to and between the gate signal lines; pixel electrodes provided in regions surrounded by the gate signal lines and image signal lines; and switching elements connected to each of the pixel electrodes, wherein each of the switching elements comprises one approximately M-shaped semiconductor film comprising at least three portions overlapped with one of the gate signal lines, and at least two portions overlapped with one of the capacitance lines, and wherein each of the capacitance lines is not overlapped with a pixel of a corresponding row and is overlapped with a pixel of a row adjacent to the corresponding row.
Claim 8
Dependent Claim
138 words
An active matrix display device comprising: a plurality of image signal lines; a plurality of gate signal lines arranged approximately perpendicular to the image signal lines; a plurality of capacitance lines of which one each is arranged parallel to and between the gate signal lines; pixel electrodes provided in regions surrounded by the gate signal lines and image signal lines; and switching elements connected to each of the pixel electrodes, wherein each of the switching elements comprises one approximately M-shaped semiconductor film comprising at least three portions overlapped with one of the gate signal lines, and at least two portions overlapped with one of the capacitance lines, and wherein each of the capacitance lines is not overlapped with a pixel of a corresponding row and is overlapped with a pixel of a row adjacent to the corresponding row.
Claim 9
Dependent Claim
165 words
An active matrix display apparatus comprising: a plurality of image signal lines; a plurality of gate signal lines arranged approximately perpendicular to the image signal lines; a plurality of capacitance lines of which one each is arranged parallel to and between the gate signal lines; pixel electrodes provided in regions surrounded by the gate signal lines and image signal lines; and switching elements connected to each of the pixel electrodes, wherein each of the switching elements comprises one approximately M-shaped semiconductor film comprising a region which is in contact with one of the image signal lines, a region which is in contact with the pixel electrodes, and at least four regions which are divided by the capacitor lines and the gate signal lines, all of the regions having a N-type or P-type conductivity type, and wherein each of the capacitance lines is not overlapped with a pixel of a corresponding row and is overlapped with a pixel of a row adjacent to the corresponding row.
Claim 10
Dependent Claim
165 words
An active matrix display apparatus comprising: a plurality of image signal lines; a plurality of gate signal lines arranged approximately perpendicular to the image signal lines; a plurality of capacitance lines of which one each is arranged parallel to and between the gate signal lines; pixel electrodes provided in regions surrounded by the gate signal lines and image signal lines; and switching elements connected to each of the pixel electrodes, wherein each of the switching elements comprises one approximately M-shaped semiconductor film comprising a region which is in contact with one of the image signal lines, a region which is in contact with the pixel electrodes, and at least four regions which are divided by the capacitor lines and the gate signal lines, all of the regions having a N-type or P-type conductivity type, and wherein each of the capacitance lines is not overlapped with a pixel of a corresponding row and is overlapped with a pixel of a row adjacent to the corresponding row.
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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) | 2001-06-08 | 2001-12-08 | 2002-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-06-08 | 2005-12-08 | 2006-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-06-08 | 2009-12-08 | 2010-06-09 | $7700.00 | Window Closed / Lapsed |