Patent US5208690A successfully refreshed from Google Patents.
US5208690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal display having a plurality of pixels with switching transistors
Assignee: Sony Corp
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Filing: 1991-03-21
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Granted: 1993-05-04
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Expires: 2011-03-21
Abstract
Abstract Two contact holes are formed through an insulating layer at its portion corresponding to a drain of a switching thin film transistor and a height of a wall portion between the two contact holes is selected to be smaller than that of a surrounding insulating layer, whereby the transparent electrode is connected to the drain via the two contact holes with excellent coverage. Thus, a connection between the switching transistor and the transparent pixel electrode in the liquid crystal display device can be effected with improved reliability.
Inventors
- 👤 Hisao Hayashi
- 👤 Akio Kawamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:11
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/136; G02F1/1362; G02F1/136227; G02F1/1333; G02F1/1335; G02F1/133509; G02F1/133512; G02F2201/00; G02F2201/48; G02F2202/00; G02F2202/10; G02F2202/104
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
46 words
A liquid crystal display device composed of a plurality of pixels respectively having switching transistors and aligned in a matrix form, comprising: a plurality of contact holes through which a transparent pixel electrode of each of said pixels is connected to each of said switching transistors.
Claim 2
Dependent Claim
46 words
A liquid crystal display device composed of a plurality of pixels respectively having switching transistors and aligned in a matrix form, comprising: a plurality of contact holes through which a transparent pixel electrode of each of said pixels is connected to each of said switching transistors.
Claim 3
Dependent Claim
41 words
A liquid crystal display device according to claim 1, wherein said transparent pixel electrode is disposed over an insulating layer, said insulating layer having a thickness not less than a height of a wall portion between the plurality of contact holes.
Claim 4
Dependent Claim
37 words
A liquid crystal display device according to claim 1, wherein each of the contact holes is tapered so as to reduce the width toward a contact portion between each switching transistor and the associated transparent pixel electrode.
Claim 5
Dependent Claim
23 words
A liquid crystal display device according to claim 1, wherein said switching transistors are disposed on an insulating substrate through a reflection-preventing layer.
Claim 6
Dependent Claim
92 words
A liquid crystal display device comprising: a first substrate having an electrode on the inner surface thereof; a second substrate opposed to the first substrate and having an array of pixels, each pixel comprising a transparent pixel electrode, and a switching transistor electrically connected to the transparent pixel electrode by means of at least two contact holes; signal lines associated with columns of the pixels in the matrix; and address lines associated with rows of the pixels in the matrix; and a liquid crystal layer sandwiched between the first and second substrates.
Claim 7
Dependent Claim
92 words
A liquid crystal display device comprising: a first substrate having an electrode on the inner surface thereof; a second substrate opposed to the first substrate and having an array of pixels, each pixel comprising a transparent pixel electrode, and a switching transistor electrically connected to the transparent pixel electrode by means of at least two contact holes; signal lines associated with columns of the pixels in the matrix; and address lines associated with rows of the pixels in the matrix; and a liquid crystal layer sandwiched between the first and second substrates.
Claim 8
Dependent Claim
28 words
A liquid crystal display device according to claim 5, wherein said switching transistor is disposed on a reflection preventing layer which is selectively disposed on the second substrate.
Claim 9
Dependent Claim
18 words
A liquid crystal display device according to claim 6, wherein said reflection preventing layer comprises a silicon nitride.
Claim 10
Dependent Claim
51 words
A liquid crystal display device according to claim 5, wherein said switching transistor comprises thin film of silicon selectively disposed on the second substrate for defining source, channel and drain regions, a gate insulating film disposed on the thin film of silicon and a gate electrode on the gate insulating film.
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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) | 1996-05-03 | 1996-11-02 | 1997-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-03 | 2000-11-02 | 2001-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-03 | 2004-11-02 | 2005-05-04 | $7700.00 | Window Closed / Lapsed |