US5235448A
Expired / Lapsed
US
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Liquid crystal display having proportional tft channel width
Assignee: AUO Corp
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Filing: 1991-07-08
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Granted: 1993-08-10
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Expires: 2011-07-08
Abstract
Abstract A thin film transistor liquid crystal display having different size pixels wherein the channel width of the thin film transistors is proportional to the area or capacitance of the pixel to thereby equalize punch-through voltage, write time and hold time for the pixels and to eliminate flicker.
Inventors
- 👤 Hiroshi Suzuki
- 👤 Hidefumi Yamaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:03
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3607; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/136; G02F1/1362; G02F1/1368; G02F1/1333; G02F1/1343; G02F1/134309; G02F1/134345; G02F1/136213; G09G3/2007; G09G3/2074
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
64 words
In a liquid crystal display having a plurality of pixel electrodes of different sizes, and a plurality of thin film transistors each of which is connected to a corresponding one of said pixel electrodes, each thin film transistor having a gate channel width, the improvement comprising: the gate channel width of said each thin film transistor being proportional to area of said pixel electrode.
Claim 2
Dependent Claim
64 words
In a liquid crystal display having a plurality of pixel electrodes of different sizes, and a plurality of thin film transistors each of which is connected to a corresponding one of said pixel electrodes, each thin film transistor having a gate channel width, the improvement comprising: the gate channel width of said each thin film transistor being proportional to area of said pixel electrode.
Claim 3
Dependent Claim
63 words
In a liquid crystal display having a plurality of pixel electrodes of different sizes, and a plurality of thin film transistors each of which is connected to a corresponding one of said pixel electrodes, each thin film transistor having a gate channel width, the improvement comprising: the gate channel width of said each thin film transistor being proportional to capacitance of said pixel.
Claim 4
Dependent Claim
63 words
In a liquid crystal display having a plurality of pixel electrodes of different sizes, and a plurality of thin film transistors each of which is connected to a corresponding one of said pixel electrodes, each thin film transistor having a gate channel width, the improvement comprising: the gate channel width of said each thin film transistor being proportional to capacitance of said pixel.
Claim 5
Dependent Claim
19 words
A liquid crystal display according to claim 2 wherein said capacitance comprises capacitance of an electrode of said pixel.
Claim 6
Dependent Claim
20 words
A liquid crystal display according to claim 3 wherein said capacitance further comprises a compensation capacitor associated with said pixel.
Claim 7
Dependent Claim
59 words
In a liquid crystal display including at least one display element having a plurality of pixels of different sizes and a thin film transistor for driving each of said pixels, each thin film transistor having a gate channel width, the improvement comprising: the gate channel width of each thin film transistor being proportional to capacitance of its respective pixel.
Claim 8
Dependent Claim
59 words
In a liquid crystal display including at least one display element having a plurality of pixels of different sizes and a thin film transistor for driving each of said pixels, each thin film transistor having a gate channel width, the improvement comprising: the gate channel width of each thin film transistor being proportional to capacitance of its respective pixel.
Claim 9
Dependent Claim
17 words
A liquid crystal display according to claim 5 wherein there are four pixels in each display element.
Claim 10
Dependent Claim
21 words
A liquid crystal display according to claim 6 wherein the pixels have areas related by successive powers of a predetermined number.
Claim 11
Dependent Claim
13 words
A liquid crystal display according to claim 7 wherein the number is 2.
Claim 12
Dependent Claim
19 words
A liquid crystal display according to claim 5 wherein said capacitance comprises capacitance of an electrode of said pixel.
Claim 13
Dependent Claim
20 words
A liquid crystal display according to claim 9 wherein said capacitance further comprises a compensation capacitor associated with said pixel.
References Cited (Backward Citations)
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) | 1996-08-09 | 1997-02-08 | 1997-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-09 | 2001-02-08 | 2001-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-09 | 2005-02-08 | 2005-08-10 | $7700.00 | Window Closed / Lapsed |