EP0179915A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Liquid crystal display element and a method of producing the same
Assignee: Hosiden Corp
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Filing: 1985-04-10
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Granted: —
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Expires: 2005-04-10
Abstract
Abstract A liquid crystal display element comprises a first clear substrate (11) and a second clear substrate (12) that are opposite each other and are close to each other, wherein a liquid crystal (4) is contained between the clear substrates (11) and (12), a plurality of display electrodes (15) and thin-film transistors (16) connected thereto are formed on the inner surface of the first clear substrate (11), a common clear electrode (17) is formed on the inner surface of the second clear substrate (12), and wherein the thin-film transistors (16) are selectively controlled to selectively display the display electrodes (15). With the above liquid crystal display element, the semiconductor layer (21) of thin-film transistor (16) loses its resistance when light strikes it so that the contrast of the display is adversely affected. According to the present invention, an opaque metal layer (29) is formed between the thin-film transistors (16) and the first clear substrate (11), and an insulating layer (32) is interposed between the opaque metal layer (29) and the thin-film transistor (16). Further, a source bus (31) is formed on the first clear substrate (11) so as to be connected to the opaque metal layer (29), the source bus (31) being composed of the same material as the opaque metal layer (29).
Inventors
- 👤 Shigeo Aoki
- 👤 Yasuhiro Ugai
- 👤 Katsumi Miyake
- 👤 Kotaro Okamoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 19:15
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/136; G02F1/1362; G02F1/1368; G02F1/136209; G02F1/1333; G02F1/1335; G02F1/133509; G02F1/133514; Y; Y10; Y10S; Y10S359/00; Y10S359/90
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
192 words
A liquid crystal display device comprising first and second transparent substrates closely spaced apart and facing each other, a liquid crystal sealed between said transparent substrates, a plurality of transparent display electrodes provided on the inner surface of said first transparent substrate, thin film transistors formed on said first transparent substrates and each having a drain connected to each said display electrode, and a 'transparent common electrode formed substantially on the entire inner surface of said second transparent substrate, said thin film transistors each including a semiconductor layer formed between corresponding display electrode and source electrode, a gate insulating film formed on said semiconductor layer on the side opposite said first transparent substrate, and a gate electrode formed on said gate insulating film, an opaque metal layer being formed between each said thin film transistor and said first transparent substrate via an insulating layer, source buses of the same material as said opaque metal layer being formed integrally therewith on the side of said first transparent substrate to face said source electrodes via said insulating layer, said source buses being connected to said source electrodes through holes formed in said insulating layer.
Claim 2
Dependent Claim
192 words
A liquid crystal display device comprising first and second transparent substrates closely spaced apart and facing each other, a liquid crystal sealed between said transparent substrates, a plurality of transparent display electrodes provided on the inner surface of said first transparent substrate, thin film transistors formed on said first transparent substrates and each having a drain connected to each said display electrode, and a 'transparent common electrode formed substantially on the entire inner surface of said second transparent substrate, said thin film transistors each including a semiconductor layer formed between corresponding display electrode and source electrode, a gate insulating film formed on said semiconductor layer on the side opposite said first transparent substrate, and a gate electrode formed on said gate insulating film, an opaque metal layer being formed between each said thin film transistor and said first transparent substrate via an insulating layer, source buses of the same material as said opaque metal layer being formed integrally therewith on the side of said first transparent substrate to face said source electrodes via said insulating layer, said source buses being connected to said source electrodes through holes formed in said insulating layer.
Claim 3
Dependent Claim
66 words
The liquid crystal display device according to claim 1, wherein second source buses of the same opaque metal as of said source electrodes are formed on the side of said insulating layer opposite said first transparent substrate and connected to said source electrodes, and each said second source bus and the corresponding source bus of said opaque metal layers are connected together at a source terminal.
Claim 4
Dependent Claim
34 words
The liquid crystal display device according to claim 1 or 2, wherein light-blocking layers of an opaque metal are formed on portions of said second transparent substrate corresponding to gaps between adjacent display electrodes.
Claim 5
Dependent Claim
26 words
The liquid crystal display device according to claim 3, wherein color filters are formed on said second transparent substrate such that they face said display electrodes.
Claim 6
Dependent Claim
24 words
The liquid crystal display device according to claim 4, wherein said light-blocking layers are formed between said common electrode and said second transparent. substrate.
Claim 7
Dependent Claim
26 words
The liquid crystal display device according to claim 5, wherein said light-blocking layers partly overlie said color filters on the side opposite said second transparent substrate.
Claim 8
Dependent Claim
89 words
The liquid crystal display device according to claim 4, wherein said display electrodes are picture element electrodes arranged in a matrix array, said thin film transistors connected to the picture element electrodes in each column have their source electrodes connected to a common source bus, said thin film transistors connected to the picture element electrodes in each row of said matrix array have their gate electrodes connected to a common gate bus, and said color filters consist of a plurality of different color filters, which are substantially uniformly distributed.
Claim 9
Dependent Claim
75 words
The liquid crystal display device according to claim 1 or 2, wherein said display electrodes are picture element electrodes arranged in a matrix array, said thin film transistors connected to the picture element electrodes in each column have their source electrodes connected to a common source bus, and said thin film transistors connected to the picture element electrodes in each row of said matrix array have their gate electrodes connected to a common gate bus.
Claim 10
Independent Claim
180 words
A method of manufacturing a liquid crystal display device by the steps of forming a plurality of transparent display electrodes and thin film transistors with their drains connected to said transparent display electrodes on one surface of a first transparent substrate, forming a transparent common electrode on and substantially over the entire surface of a second transparent substrate and sealing a liquid crystal between said first and second transparent substrates with said display electrodes and common electrode on the inner side, wherein: opaque metal layers are formed on areas of one surface of said first transparent substrate where said thin film transistors are to be formed, together with source buses of the same material as and connected to said opaque metal layers; an insulating layer is formed on said opaque metal layers and source buses; holes are formed in said insulating layer at positions corresponding to said source buses prior to the formation of said thin film transistors on said opaque metal layers, the source electrodes of said thin film transistors being connected to said source buses through said holes.
Claim 11
Independent Claim
180 words
A method of manufacturing a liquid crystal display device by the steps of forming a plurality of transparent display electrodes and thin film transistors with their drains connected to said transparent display electrodes on one surface of a first transparent substrate, forming a transparent common electrode on and substantially over the entire surface of a second transparent substrate and sealing a liquid crystal between said first and second transparent substrates with said display electrodes and common electrode on the inner side, wherein: opaque metal layers are formed on areas of one surface of said first transparent substrate where said thin film transistors are to be formed, together with source buses of the same material as and connected to said opaque metal layers; an insulating layer is formed on said opaque metal layers and source buses; holes are formed in said insulating layer at positions corresponding to said source buses prior to the formation of said thin film transistors on said opaque metal layers, the source electrodes of said thin film transistors being connected to said source buses through said holes.
Claim 12
Dependent Claim
87 words
The method of manufacturing a liquid crystal display device according to claim 9, wherein the source electrodes of said thin film transistors, said display electrodes and second source buses connected to said source electrodes are formed at a time from the same transparent metal in the formation of said thin film transistors, and at least one end of each said second source bus is connected to a corresponding end of the corresponding source bus of said opaque metal in an overlying relation thereto at a source terminal.
Claim 13
Dependent Claim
47 words
The method of manufacturing a liquid crystal display device according to claim 9 or 10, wherein said common electrode is formed after formation of color filters on portions of said second transparent substrate facing said display electrodes and metal light-blocking layers filling gaps between adjacent color filters.
Claim 14
Dependent Claim
25 words
The method of manufacturing a liquid crystal display device according to claim 11, wherein said light-blocking layers are formed after formation of said color filters.
References Cited (Backward Citations)
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