EP0276340A1
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EP
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Matrix display device having composite transistors
Assignee: Hosiden Electronics Co Ltd
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Filing: 1987-01-26
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Granted: —
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Expires: 2007-01-26
Abstract
Abstract In a liquid crystal display device, display electrodes (15) are arranged in a matrix form, gate and source buses (18, 19) are provided for each row and column of the display electrodes (15), and a pixel driving composite transistor (16, 34) is connected between each display electrode (15) and the gate and source buses (18, 19) for driving the display electrode (15). Source-drain electrode pairs (15a, 19a; 15b, 19b; 15c, 19c; 15d, 19d) opposite in the direction of arrangement, which are equal in number, are provided for each transistor (16, 34) and a common semiconductor layer (21) and a common gate electrode (23) are provided for all the source and drain electrodes (19a, 19b, 19c, 19d; 15a, 15b, 15c, 15d) to form even number of thin film transistors (16, 34) connected in parallel to one another, thereby constituting the composite transistor (16, 34) for driving a pixel.
Inventors
- 👤 Masaru Yasui
- 👤 Taisuke Miyazu
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 13:31
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/136; G02F1/1362; G02F1/1368
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
142 words
A pixel driving composite transistor having a drain electrode (15a) connected to a display electrode (15), a source electrode (19a), a semiconductor layer (21) formed extending between them, a gate insulating film (22) formed on the semiconductor layer, and a gate electrode (23) formed on the gate insulating film, characterized in that: the source electrodes (19a, 19b, 19c, 19d) are even in number and connected to a source bus (19); the drain electrodes (15a, 15b, 15c, 15d)are arranged in opposing relation to the respective source electrodes such that the drain electrodes of half the number (15a, 15c) are opposite in the direction of arrangement relative to the source electrodes (19a, 19c) from the drain electrodes of the rest (19b, 19d); and the semiconductor layer (21) and the gate electrode (23) are both provided in common to all the source and drain electrodes.
Claim 2
Dependent Claim
142 words
A pixel driving composite transistor having a drain electrode (15a) connected to a display electrode (15), a source electrode (19a), a semiconductor layer (21) formed extending between them, a gate insulating film (22) formed on the semiconductor layer, and a gate electrode (23) formed on the gate insulating film, characterized in that: the source electrodes (19a, 19b, 19c, 19d) are even in number and connected to a source bus (19); the drain electrodes (15a, 15b, 15c, 15d)are arranged in opposing relation to the respective source electrodes such that the drain electrodes of half the number (15a, 15c) are opposite in the direction of arrangement relative to the source electrodes (19a, 19c) from the drain electrodes of the rest (19b, 19d); and the semiconductor layer (21) and the gate electrode (23) are both provided in common to all the source and drain electrodes.
Claim 3
Dependent Claim
75 words
The pixel driving composite transistor according to claim 1, wherein the display electrode is one of square electrodes arranged in a matrix form, a gate bus is provided for each row of the display electrodes, the source bus is one of those provided for respective columns of the display electrodes, and the gate and source buses and each display electrode are connected via the composite transistor in the vicinity of each intersection of the buses.
Claim 4
Dependent Claim
73 words
The pixel driving composite transistor according to claim 2, wherein the source bus or a pattern branched therefrom has an extension extending in the direction of extension of the source bus or branched pattern, the display electrode has an extended pattern extending between the extension and the source bus or branched pattern in parallel thereto, and the gate electrode is provided overlapping the source bus or branched pattern and the extended portion thereof.
Claim 5
Dependent Claim
69 words
The pixel driving composite transistor according to claim 2, wherein the source bus or a pattern branched therefrom has an extension extending in the direction of extension of the source bus or branched pattern, the display electrode has an extended pattern extending between the extension and the source bus or branched pattern in parallel thereto, and the gate electrode is provided overlapping the extended pattern and the display electrode.
Claim 6
Dependent Claim
76 words
The pixel driving composite transistor according to claim 3 or 4, wherein the extension is further extended, as a second extension, from its point of connection to the source bus or branched pattern in the opposite direction, the display electrode has a second extended pattern extending between the second extension and the source bus or branched pattern, and the gate electrode is extended with the same width on the second extension and the second extended pattern.
Claim 7
Dependent Claim
75 words
The pixel driving composite transistor according to claim 3 or 4, wherein the extended pattern is further extended, as a second extended pattern, from its point of connection to the display electrode in the opposite direction, the source bus or branched pattern has a second extension extending between the second extended pattern and the display electrode, and the gate electrode is extended with the same width on the second extended pattern and the second extension.
Claim 8
Dependent Claim
108 words
The pixel driving composite transistor according to claim 2, wherein the source bus has a branched pattern extending substantially perpendicularly thereto along one marginal edge of the display electrode, the branched pattern has an extension disposed further to the display electrode than the extending end of the branched pattern and positioned in a recess made in the marginal edge of the display electrode, the display electrode has an extended pattern extending along the extension at the opposite side from the display electrode, and a gate bus extending between the branched pattern and the display electrode and between the extended pattern and the extension serves as the gate electrode.
Claim 9
Dependent Claim
70 words
The pixel driving composite transistor according to claim 2, wherein the source bus has a branched pattern extending substantially perpendicularly thereto along one marginal edge of the display electrode, the display electrode has an extended pattern extending along the branched pattern at the side opposite from the display electrode, and a gate bus formed overlapping the extended pattern, the branched pattern and the display electrode serves as the gate electrode.
References Cited (Backward Citations)
US4597001A
Cited
EP0209113A2
Cited
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