EP0438138A2
Expired / Lapsed
EP
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Liquid-crystal display device of active matrix type
Assignee: Toshiba Corp
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Filing: 1991-01-16
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Granted: —
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Expires: 2011-01-16
Abstract
Abstract In a liquid-crystal display device of active matrix type, a plurality of column-selecting lines (11) and a plurality of auxiliary capacitance lines (27) are formed on a transparent substrate (20) and a plurality of row-selecting lines (12) and two display electrodes (26) are formed on a transparent insulative layer (22) formed on the column-selecting and auxiliary capacitance lines (11, 27) and the substrate. Two switching elements (13) each connected to the column-selecting, row-selecting and auxiliary capacitance lines (11, 12, 27) are also formed on the substrate (20). Two auxiliary capacitors are formed between the display-electrode segments (26) and the auxiliary capacitance line (27) and each of stripe conductors (31) is formed on the substrate (20) under the pair of display-electrode segments (26). A common electrode (29) is arranged as to face the display electrode segments (26) and a liquid crystal layer (14) is located between the common electrodes (29) and the display electrode segments (26).
Inventors
- 👤 Hidetaka C/O Intellectual Property Div. Noriyama
- 👤 Isao C/O Intellectual Property Div. Fukui
- 👤 Tokio C/O Intellectual Property Div. Kiboshi
- 👤 Shoudai C/O Intellectual Property Div. Nakayama
- 👤 Masanori C/O Intellectual Property Div. Abe
- 👤 Tomio C/O Intellectual Property Div. Kashihara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 12:12
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/136; G02F1/1362; G02F1/13624; G02F1/1333; G02F1/1343; G02F1/134309; G02F1/134345; G02F1/136213; G02F1/136259
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
288 words
A liquid-crystal display device of active matrix type characterized by comprising: a transparent substrate (20); a plurality of column-selecting lines (11) arranged at said substrate (20); a plurality of auxiliary capacitance lines (27) arranged at said substrate (20) and electrically isolated from said column-selecting lines (11); a plurality of row-selecting lines (12) arranged at said substrate (20), intersecting with said column-selecting lines (11) and said auxiliary capacitance lines (27), and electrically isolated from said column-selecting lines (11) and said auxiliary capacitance lines (27); a plurality of display electrodes (26) arranged in rows and columns, each defining one pixel and consisting of a first display-electrode segment (26) and a second display-electrode segment (26); a plurality of first switching elements (13) connecting said first display-electrode segments (26) to said column-selecting lines (11) and said row-selecting lines (12), respectively; a plurality of second switching elements (13) connecting said second display-electrodes segments (26) to said column-selecting lines (11) and said row-selecting lines (12), respectively; a first auxiliary capacitor interposed between said first display-electrode segments (26) on the one hand and said auxiliary capacitance lines (27) on the other hand; a second auxiliary capacitor interposed between said second display-electrode segments (26) on one hand and said auxiliary capacitance lines (27) on the other hand; a plurality of conductors (31) provided for the pixels, each overlapping the corresponding first display-electrode segment (26) and the corresponding second display-electrode segment (26), for electrically connecting said first and second display-electrode segments (26); a common electrode (29) opposing said first display-electrode segments (26) and said second display-electrode segments (26); and a layer (14) of liquid crystal interposed between said common electrode (29) on the one hand and said first and second display-electrode segments (26) on the other hand.
Claim 2
Dependent Claim
59 words
The display device according to claim 1, characterized by further comprising a transparent insulating layer (20) formed on said transparent substrate (20), said coloum-selecting lines (11), said auxiliary capacitance lines (27) and said conductors (31), said row-selecting lines (12), said display electrode (26) and said first and second display-electrode segments (26) being formed on said transparent insulating layer (20).
Claim 3
Dependent Claim
23 words
The display device according to claim 1, characterized in that each of said first and second switching elements (13) has a transistor structure.
Claim 4
Dependent Claim
110 words
The display device according to claim 2, characterized in that each of said first and second switching elements (13) has a gate electrode (21) formed on said substrate (20) and connected to the corresponding coloum-selecting line (11), a semiconductor layer (23) formed on said transparent insulating layer (22), located above the gate electrode (22) and having a source region (25a) and a drain region (24a), a source electrode (25) formed on the semiconductor layer (23) and connected to the corresponding first display-electrode segment (26) and the corresponding second display-electrode segment (26), and a drain electrode (24) formed on the semiconductor layer (23) and connected to the corresponding row-selecting line (12).
Claim 5
Dependent Claim
60 words
The display device according to claim 1, characterized in that each of said auxiliary capacitance lines (27) has a short portion connected to one of the corresponding first display-electrode segment (26) and the corresponding second display-electrode segment (26), and each of said conductors (31) is electrically connected to the corresponding first display-electrode segment (26) and the corresponding second display-electrode segment.
Claim 6
Dependent Claim
41 words
The display device according to claim 5, characterized in that each of said auxiliary capacitance lines (27) further has a disconnecting portion (Da1) which is to be cut, thereby to electrically disconnect the short portion from the auxiliary capacitance line (27).
Claim 7
Dependent Claim
42 words
The display device according to claim 5, characterized in that each of said first switching elements (13) or each of said second switching elements (13) is electrically isolated from the corresponding first display-electrode segment (26) and the corresponding second display-electrode segment (26).
Claim 8
Dependent Claim
53 words
The display device according to claim 1, characterized in that each of said first and second display-electrode segments (26) has a main portion defining a pixel, a capacitive portion opposing the corresponding auxiliary capacitance line (27), and a thin portion connecting the capacitive portion to the main portion and being easy to cut.
Claim 9
Dependent Claim
280 words
A liquid-crystal display device of active matrix type characterized by comprising: a transparent substrate (20); a plurality of column-selecting lines (11) arranged at said substrate (20); a plurality of auxiliary capacitance lines (27) arranged at said substrate (20) and electrically isolated from said column-selecting lines (11); a plurality of row-selecting lines (12) arranged at said substrate (20), intersecting with said column-selecting lines (11) and said auxiliary capacitance lines (27), and electrically isolated from said column-selecting lines (11) and said auxiliary capacitance lines (27); a plurality of display electrodes (26a) arranged in rows and columns, each defining one pixel; a plurality of first display-electrode segments (26c) projecting from said display electrodes (26a), respectively; a plurality of second display-electrode segments (26c) projecting from said display electrodes (26a), respectively; a plurality of switching elements (13, 13A, 13B, 13C) connecting said display electrodes (26a) to said row-selecting lines (12) and said coloum-selecting lines (11), respectively; a first auxiliary capacitor interposed between said first display-electrode segments (26c) on the one hand and said auxiliary capacitance lines (27) on the other hand; a second auxiliary capacitors interposed between said second display-electrode segments (26c) on the one hand and said auxiliary capacitance lines (27) on the other hand; a plurality of conductors (31) provided for the pixels, each overlapping the corresponding first display-electrode segment (26a) and the corresponding second display-electrode segment (26c), for electrically connecting said first and second display-electrode segments (26c); a common electrode (29) opposing said first display-electrode segments (26a) and said second display-electrode segments (26a); and a layer (14) of liquid crystal interposed between said common electrode (29) on the one hand and said first and second display-electrode segments (26a) on the other hand.
Claim 10
Dependent Claim
55 words
The display device according to claim 9, further comprising a transparent insulating layer (22) formed on said transparent substrate (20), said coloum-selecting lines, said auxiliary capacitance lines (27) and said conductors (31), said row-selecting lines (12), said display-electrode (26a) and said first and second display-electrode segments (26c) being formed on said transparent insulating layer (20).
Claim 11
Dependent Claim
23 words
The display device according to claim 9, characterized in that each of said switching elements (13, 13A, 13B, 13C) has a transistor structure.
Claim 12
Dependent Claim
111 words
The display device according to claim 11, characterized in that each of said switching elements (13, 13A, 13B, 13C) has a gate electrode (21) formed on said substrate (20) and connected to the corresponding coloum-selecting line (11), a semiconductor layer (23) formed on said transparent insulating layer (22), located above the gate electrode (22) and having a source region (25a) and a drain region (24a), a source electrode (25) formed on the semiconductor layer (23) and connected to the corresponding first display-electrode segment (26c) and the corresponding second display-electrode segment (26c) , and a drain electrode (24) formed on the semiconductor layer (23) and connected to the corresponding row-selecting line (12).
Claim 13
Dependent Claim
73 words
The display device according to claim 9, characterized in that each of said auxiliary capacitance lines (27) has a short portion (Da2) electrically connected to one of the corresponding first display-electrode segment (26c) and the corresponding second display-electrode segment (26c), and each of said conductors (31) is electrically connected to one of the corresponding first display-electrode segment (26c) and the corresponding second display-electrode segment (26c) and also to the corresponding display electrode (26).
Claim 14
Dependent Claim
37 words
The display device according to claim 9, characterized by further comprising a plurality of second switching elements (13, 13A, 13B, 13C) connected to said column-selecting and row-selecting lines (11, 12) which correspond to said display electrodes (26).
Claim 15
Dependent Claim
31 words
The display device according to claim 14, characterized in that said first switching elements or said second switching elements (13, 13A, 13B, 13C) are electrically isolated from said display electrodes (26).
Claim 16
Dependent Claim
33 words
The display device according to claim 14, characterized in that said first switching elements (13, 13A, 13B, 13C) have a capacitance different from that of said second switching elements (13, 13A, 13B, 13C).
Claim 17
Dependent Claim
50 words
The display device according to claim 9, characterized in that each of said first and second display-electrode segments (26b) has a capacitive portion opposing the corresponding auxiliary capacitance line (27), and a thin portion connecting the capacitive portion (26b) to the corresponding display electrode (26) and being easy to cut.
Claim 18
Dependent Claim
34 words
The display device according to claim 9, characterized in that each of said display electrodes (26) comprises two segments (26a) and a thing portion (26e) connecting these segments (26a) and being easy to cut.
Claim 19
Dependent Claim
282 words
A liquid-crystal display device of active matrix type characterized by further comprising: a transparent substrate (20); a plurality of column-selecting lines (11) arranged at said substrate (20); a plurality of auxiliary capacitance lines (27) arranged at said substrate (20) and electrically isolated from said column-selecting lines (11); a plurality of row-selecting lines (12) arranged at said substrate (11), intersecting with said column-selecting lines (11) and said auxiliary capacitance lines (27), and electrically isolated from said column-selecting lines (11) and said auxiliary capacitance lines (27); a plurality of display electrodes (26) arranged in rows and columns, each defining one pixel; a plurality of first display-electrode segments (26b) projecting from said display electrodes (26), respectively; a plurality of second display-electrode segments (26f) electrically isolated from said display electrodes (26), respectively; a plurality of switching elements (13) connecting said display electrodes (26) to said column-selecting lines (11) and said row-selecting lines (12), respectively; a first auxiliary capacitor interposed between said first display-electrode segments (26b) on the one hand and said auxiliary capacitance lines (27) on the other hand; a second auxiliary capacitors interposed between said second display-electrode segments (26f) on the one hand and said auxiliary capacitance lines (27) on the other hand; a plurality of conductors (31) provided for the pixels, each overlapping the corresponding display electrode (26) and the corresponding second display-electrode segment (26f), for electrically connecting said display electrode (26) and said second display-electrode segment (26e); a common electrode (29) opposing said first display-electrode segments (26b) and said second display-electrode segments (26e); and a layer (14) of liquid crystal interposed between said common electrode (28) on the one hand and said first and second display-electrode segments (286, 26e) on the other hand.
Claim 20
Dependent Claim
58 words
The display device according to claim 19, characterized by further comprising a transparent insulating layer (22) formed on said transparent substrate (20), said coloum-selecting lines, said auxiliary capacitance lines (27) and said conductors (31), said row-selecting lines (12), said display-electrode (26) and said first and second display-electrode segments (26b, 26e) being formed on said transparent insulating layer (22).
Claim 21
Dependent Claim
20 words
The display device according to claim 19, characterized in that each of said switching elements (13) has a transistor structure.
Claim 22
Dependent Claim
107 words
The display device according to claim 20, characterized in that each of said switching elements (13) has a gate electrode (21) formed on said substrate (20) and connected to the corresponding coloum-selecting line (11), a semiconductor layer (23) formed on said transparent insulating layer (22), located above the gate electrode (21) and having a source region (25a) and a drain region (34a), a source electrode (25) formed on the semiconductor layer (23) and connected to the corresponding first display-electrode segment (26b) or the corresponding second display-electrode segment (26f), and a drain electrode (24) formed on the semiconductor layer (23) and connected to the corresponding row-selecting line (12).
Claim 23
Dependent Claim
51 words
The display device according to claim 21, characterized in that each of said auxiliary capacitance lines (27) has a short portion electrically connected to the corresponding first display-electrode segment(26b), and each of said conductors (31) is electrically isolated from the corresponding second display-electrode segment (26f) and the corresponding display electrode (26).
Claim 24
Dependent Claim
51 words
The display device according to claim 21, characterized in that each of said auxiliary capacitance lines (27) has a short portion electrically connected to the corresponding second display-electrode segment (26f), and each of said conductors (31) are electrically isolated from the second display-electrode segment (26f) and the corresponding display electrode (26).
Claim 25
Dependent Claim
47 words
The display device according to claim 19, characterized in that each of said first display-electrode segments (26b) has a capacitive portion opposing the corresponding auxiliary capacitance line (27), and a thin portion connecting the capacitive portion to the corresponding display electrode (26) and being easy to cut.
References Cited (Backward Citations)
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