Patent EP0449123A2 successfully refreshed from Google Patents.
EP0449123A2
Expired / Lapsed
EP
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Liquid crystal display device
Assignee: Sony Corp
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Filing: 1991-03-21
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Granted: —
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Expires: 2011-03-21
Abstract
Abstract Two contact holes (21, 22) are formed through an insulating layer (10) at its portion corresponding to a drain (5D) of a switching thin film transistor (2) and a height of a wall portion (26a) between the two contact holes is selected to be smaller than that of a surrounding insulating layer (26), whereby the transparent electrode (1) 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
EP
Data Source
google_patents
Last Synchronized
2026-10-31 21:45
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: 7
Claim 1
Independent Claim
50 words
A liquid crystal display device composed of a plurality of pixels respectively having switching transistors (2) and aligned in a matrix form, comprising: a plurality of contact holes (21, 22) through which a transparent pixel electrode (1) of each of said pixels is connected to each of said switching transistors.
Claim 2
Dependent Claim
40 words
A liquid crystal display device according to claim 1, in which a height t₁ of a wall portion (26a) between said plurality of contact holes is selected to be smaller than a height t₂ of a surrounding insulating layer (26).
Claim 3
Dependent Claim
34 words
A liquid crystal display device according to claim 1, in which said plurality of contact holes are tapered so as to reduce their widths toward the contact portion with each of said switching transistors.
Claim 4
Dependent Claim
24 words
A liquid crystal display device according to claim 1, in which said insulating substrate and said switching transistors have a reflection preventing layer therebeween.
Claim 5
Dependent Claim
82 words
A liquid crystal display device composed of a plurality of pixels respectively having switching transistors and aligned in a matrix form, comprising: means for making each of said switching transistors in contact with a transparent pixel electrode of each of said pixels; means for making each of said switching transistors in contact with the same material as that of a signal line; and means for making said transparent pixel electrode in contact with the same material as that of said signal line.
Claim 6
Dependent Claim
50 words
A liquid crystal display device composed of a plurality of pixels respectively having switching transistors and aligned in a matrix form, comprising: means for connecting a transparent pixel electrode of each of said pixels to each of said switching transistors via the same material as that of a signal line.
Claim 7
Dependent Claim
33 words
A liquid crystal display device according to claim 6, in which each of the transparent pixel electrodes of said pixels is connected to each of said switching transistors on a storage capacitance region.
References Cited (Backward Citations)
No citation records indexed.
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