Patent US1513430A successfully refreshed from Google Patents.
Patent EP0341003A2 successfully refreshed from Google Patents.
EP0341003A2
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EP
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Thin film semiconductor device and liquid crystal display apparatus using thereof
Assignee: Sharp Corp
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Filing: 1989-04-28
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Granted: —
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Expires: 2009-04-28
Abstract
Abstract The invention relates to a thin film semiconductor device and a liquid crystal display apparatus. In the thin film semiconductor device, because light irradiated to the thin film semiconductor device is cut off by a conductor layer, the light can be prevented from reaching the semiconductor layer. Therefore generation of carriers due to optical excitation does not occur and off current can be reduced. In the thin film semiconductor device, because there is no area where electric field intensity of an opposed direction of the source electrode and the drain electrode is weaker than that in the channel region in the semiconductor layer, even after an operation for a prolonged duration under the irradiation of light, carriers generated by optical excitation are not accumulated in the semiconductor layer, and probability of the trapping for the carriers into a gate insulating film is quite low, and therefore variation in the characteristics of the thin film semiconductor device is negligibly small. The liquid crystal display apparatus using the thin film semiconductor can restrict such deterioration of display quality as the degradation of contrast and uniformity.
Inventors
- 👤 Hajime Shoji
- 👤 Noriko Watanabe
- 👤 Hiroshi Hamada
- 👤 Hiroaki Kato
- 👤 Toshio Takemoto
- 👤 Toshihiko Hirobe
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 17:12
CPC Classifications
H; H10; H10D; H10D30/00; H10D30/60; H10D30/67; H10D30/6757; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/136; G02F1/1362; G02F1/1368; H10D30/6729; H10D30/673; H10D30/6732; H10D30/674; H10D30/6741; H10D30/6743; H10D30/6746; G02F1/1333; G02F1/1335; G02F1/133509; G02F1/133512
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
97 words
A thin film semiconductor device comprising; an electrically insulating substrate having one surface and another surface, at least where light transmits from the another surface to the one surface, a conductor layer which is formed on the one surface and is cut off the light, an insulator layer formed on the conductor layer, and a semiconductor layer which is formed on the insulator layer and has a width smaller than that of the conductor layer, thereby the light cut off at the conductor layer when light is irradiated from the another surface of the electrically insulating substrate.
Claim 2
Dependent Claim
97 words
A thin film semiconductor device comprising; an electrically insulating substrate having one surface and another surface, at least where light transmits from the another surface to the one surface, a conductor layer which is formed on the one surface and is cut off the light, an insulator layer formed on the conductor layer, and a semiconductor layer which is formed on the insulator layer and has a width smaller than that of the conductor layer, thereby the light cut off at the conductor layer when light is irradiated from the another surface of the electrically insulating substrate.
Claim 3
Dependent Claim
23 words
A thin film semiconductor device of claim 1 wherein a pair of electrodes separated by a space is formed on the semiconductor layer.
Claim 4
Dependent Claim
92 words
A thin film semiconductor device comprising; an electrically insulating substrate having one surface and another suface, a conductor layer which is formed on the one surface, an insulator layer formed on the conductor layer,and a semiconductor layer which is formed on the insulator layer, and a pair of electrode separated by a gap and formed on the semiconductor layer, lengths in the direction W perpendicular to the opposite direction L of these electrodes being selected to be equal to or larger than the length in said direction W of the semiconductor layer.
Claim 5
Dependent Claim
92 words
A thin film semiconductor device comprising; an electrically insulating substrate having one surface and another suface, a conductor layer which is formed on the one surface, an insulator layer formed on the conductor layer,and a semiconductor layer which is formed on the insulator layer, and a pair of electrode separated by a gap and formed on the semiconductor layer, lengths in the direction W perpendicular to the opposite direction L of these electrodes being selected to be equal to or larger than the length in said direction W of the semiconductor layer.
Claim 6
Dependent Claim
42 words
A thin film semiconductor device of claim 2 or 3 wherein said pair of electrodes are a source electrode and a drain electrode, the conductor layer is a gate electrode, and these electrodes and the semiconductor layer constitute a thin film transistor.
Claim 7
Dependent Claim
88 words
A thin film semiconductor device wherein a gate electrode, an insulator layer and a semiconductor layer are stacked in this order on an electrically insulating substrate, with a source electrode and a drain electrode which are separated by a gap formed on the semiconductor layer, and the lengths of the source electrode and the drain electrode in the direction W perpendicular to the opposed direction L of these electrodes are selected to be equal to or larger than the length of the semiconductor layer in said direction W.
Claim 8
Dependent Claim
88 words
A thin film semiconductor device wherein a gate electrode, an insulator layer and a semiconductor layer are stacked in this order on an electrically insulating substrate, with a source electrode and a drain electrode which are separated by a gap formed on the semiconductor layer, and the lengths of the source electrode and the drain electrode in the direction W perpendicular to the opposed direction L of these electrodes are selected to be equal to or larger than the length of the semiconductor layer in said direction W.
Claim 9
Dependent Claim
137 words
A liquid crystal display apparatus wherein row electrodes and column electrodes which are mutually insulated are formed on an electrically insulating substrate and a thin film semiconductor device is provided at each intersection of the row electrodes and the column electrodes, which comprising; an electrically insulating substrate having one surface and another suface, and at least where light transmits from the another surface to the one surface, a conductor layer which is formed on the one surface and is cut off the light, an insulator layer formed on the conductor layer, and a semiconductor layer which is formed on the insulator layer and has a width smaller than that of the conductor layer, and thereby the light is cut off at the conductor layer when light is irradiated from the another surface of the electrically insulating substrate.
Claim 10
Dependent Claim
137 words
A liquid crystal display apparatus wherein row electrodes and column electrodes which are mutually insulated are formed on an electrically insulating substrate and a thin film semiconductor device is provided at each intersection of the row electrodes and the column electrodes, which comprising; an electrically insulating substrate having one surface and another suface, and at least where light transmits from the another surface to the one surface, a conductor layer which is formed on the one surface and is cut off the light, an insulator layer formed on the conductor layer, and a semiconductor layer which is formed on the insulator layer and has a width smaller than that of the conductor layer, and thereby the light is cut off at the conductor layer when light is irradiated from the another surface of the electrically insulating substrate.
Claim 11
Dependent Claim
58 words
A liquid crystal display apparatus of claim 6 wherein such a thin film semiconductor device that the lengths of the source electrode and the drain electrode in the direction W perpendicular to the opposed direction L of these electrodes are selected to be equal to or larger than the length in said direction W of the semiconductor layer.
Claim 12
Dependent Claim
35 words
A liquid crystal display apparatus of claim 6 wherein said apparatus is a transmission type liquid crystal display apparatus constituted by providing a light source at a side of the another surface of the substrate.
Claim 13
Dependent Claim
63 words
A thin film semiconductor device having a laminated structure (13 to 18) on an electrically insulating substrate (12) in which a conductor layer (13) is disposed between the substrate (12) and a semiconductor layer (15), the conductor layer extending laterally beyond the edges of the semiconductor layer so as to shield said semiconductor layer from light reaching said laminated structure through said substrate.
Claim 14
Dependent Claim
63 words
A thin film semiconductor device having a laminated structure (13 to 18) on an electrically insulating substrate (12) in which a conductor layer (13) is disposed between the substrate (12) and a semiconductor layer (15), the conductor layer extending laterally beyond the edges of the semiconductor layer so as to shield said semiconductor layer from light reaching said laminated structure through said substrate.
References Cited (Backward Citations)
No citation records indexed.
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