US5546204A
Expired / Lapsed
US
⏱️ 0.0 years remaining
TFT matrix liquid crystal device having data source lines and drain means of etched and doped single crystal silicon
Assignee: Honeywell Inc
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Filing: 1994-05-26
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Granted: 1996-08-13
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Expires: 2014-05-26
Abstract
Abstract An active matrix array for liquid crystal displays which provides for a large aperture ratio. A layer of single crystal silicon is disposed over a glass substrate and etched and doped to form multiple source and drain regions for an array of thin film transistors (TFTs). Multiple gate buses are laid across the source and drain regions to form the TFTs. The drain regions each electrically contact a transparent electrode used in switching an individual pixel in a liquid crystal display. The TFTs formed do not encroach significantly into the pixel aperture and the conduction lines are constructed at minimal photolithographical requirements.
Inventors
- 👤 Roger K. Ellis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:24
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/136; G02F1/1362; G02F1/1368; G02F1/1333; G02F1/1343; G02F1/134309; G02F1/134345; G02F2202/00; G02F2202/10; G02F2202/105
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
139 words
An active matrix for a liquid crystal display comprising: a substrate; a plurality of parallel data source lines disposed on said substrate; a plurality of drain means disposed proximate to said data source lines, wherein the plurality of data source lines and drain means are formed from a layer of single crystal silicon which has been etched and selectively doped; a transparent insulating layer disposed over said data source lines, said substrate and a portion of said drain means; a plurality of parallel gate lines disposed over the insulating layer so as to intersect said data source lines and said drain means to form a plurality of contactless thin film transistors (TFT's); and a plurality of transparent electrodes disposed over the insulating layer, each of the transparent electrodes in electrical contact with one of the plurality of drain means.
Claim 2
Dependent Claim
139 words
An active matrix for a liquid crystal display comprising: a substrate; a plurality of parallel data source lines disposed on said substrate; a plurality of drain means disposed proximate to said data source lines, wherein the plurality of data source lines and drain means are formed from a layer of single crystal silicon which has been etched and selectively doped; a transparent insulating layer disposed over said data source lines, said substrate and a portion of said drain means; a plurality of parallel gate lines disposed over the insulating layer so as to intersect said data source lines and said drain means to form a plurality of contactless thin film transistors (TFT's); and a plurality of transparent electrodes disposed over the insulating layer, each of the transparent electrodes in electrical contact with one of the plurality of drain means.
Claim 3
Dependent Claim
32 words
The active matrix for a liquid crystal display of claim 1 wherein each of the drain means is located proximate to an intersection of the gate line and the data source line.
Claim 4
Dependent Claim
69 words
The active matrix for a liquid crystal display of claim 1 wherein four of the drain means are located proximate to an intersection of the gate lines and the data source lines so as create four of the TFTs, each of the drain means is in electrical contact with one of the plurality of transparent electrodes so as to provide a half tone configuration for the liquid crystal display.
Claim 5
Dependent Claim
31 words
The active matrix for a liquid crystal display of claim 3 wherein a switching voltage for each of the TFT's is determined by adjusting width to length ratios of the TFT's.
Claim 6
Dependent Claim
44 words
The active matrix for a liquid crystal display of claim 1 wherein each of the data source lines runs parallel to a metallic conductor strip, electrical contacts are provided between the metallic conductor strips and the plurality of data source lines at predetermined intervals.
Claim 7
Dependent Claim
69 words
The active matrix for a liquid crystal display of claim 5 wherein four of the drain means are located proximate to an intersection of the gate lines and the data source lines so as create four of the TFTs, each of the drain means is in electrical contact with one of the plurality of transparent electrodes so as to provide a half tone configuration for the liquid crystal display.
Claim 8
Dependent Claim
31 words
The active matrix for a liquid crystal display of claim 6 wherein a switching voltage for each of the TFT's is determined by adjusting width to length ratios of the drains.
Claim 9
Dependent Claim
23 words
The active matrix for a liquid crystal display of claim 1 wherein the plurality gate lines are comprised of indium tin oxide (ITO).
Claim 10
Dependent Claim
20 words
The active matrix for a liquid crystal display of claim 1 wherein the plurality gate lines are comprised of polysilicon.
Claim 11
Dependent Claim
23 words
The active matrix for a liquid crystal display of claim 1 wherein the plurality gate lines are comprised of a refractory metal silicide.
Claim 12
Dependent Claim
144 words
An active matrix for a liquid crystal display comprising: a transparent substrate; a first layer disposed on said transparent substrate and formed into a plurality of parallel data source lines and drain regions for a plurality of thin film transistors (TFT), wherein the plurality of data source lines and drain means are formed from a layer of single crystal silicon which has been etched and selectively doped; an oxide layer disposed over the data source lines, said transparent substrate and a portion of each of the drain regions of the first silicon layer; a plurality of gate lines disposed over the oxide layer which intersects the source and drains so as to form plurality of TFT's; and a plurality of transparent electrodes laid out in an array, each of said transparent electrodes is in electrical contact with one of the plurality of drain regions.
Claim 13
Dependent Claim
144 words
An active matrix for a liquid crystal display comprising: a transparent substrate; a first layer disposed on said transparent substrate and formed into a plurality of parallel data source lines and drain regions for a plurality of thin film transistors (TFT), wherein the plurality of data source lines and drain means are formed from a layer of single crystal silicon which has been etched and selectively doped; an oxide layer disposed over the data source lines, said transparent substrate and a portion of each of the drain regions of the first silicon layer; a plurality of gate lines disposed over the oxide layer which intersects the source and drains so as to form plurality of TFT's; and a plurality of transparent electrodes laid out in an array, each of said transparent electrodes is in electrical contact with one of the plurality of drain regions.
Claim 14
Dependent Claim
31 words
The active matrix for a liquid crystal display of claim 11 wherein each of the drains is located proximate to an intersection of the gate lines and the data source lines.
Claim 15
Dependent Claim
67 words
The active matrix for a liquid crystal display of claim 11 wherein four of the drains are located proximate to an intersection of the gate lines and the data source lines so as create four of the TFTs, each of the drains is in electrical contact with one of the plurality of transparent electrodes so as to provide a half tone configuration for the liquid crystal display.
Claim 16
Dependent Claim
31 words
The active matrix for a liquid crystal display of claim 13 wherein a switching voltage for each of the TFT's is determined by adjusting width to length ratios of the TFT's.
Claim 17
Dependent Claim
44 words
The active matrix for a liquid crystal display of claim 11 wherein each of the data source lines runs parallel to a metallic conductor strip, electrical contacts are provided between the metallic conductor strips and the plurality of data source lines at predetermined intervals.
Claim 18
Dependent Claim
67 words
The active matrix for a liquid crystal display of claim 15 wherein four of the drains are located proximate to an intersection of the gate lines and the data source lines so as create four of the TFTs, each of the drains is in electrical contact with one of the plurality of transparent electrodes so as to provide a half tone configuration for the liquid crystal display.
Claim 19
Dependent Claim
31 words
The active matrix for a liquid crystal display of claim 16 wherein a switching voltage for each of the TFT's is determined by adjusting width to length ratios of the drains.
Claim 20
Dependent Claim
23 words
The active matrix for a liquid crystal display of claim 11 wherein the plurality gate lines are comprised of indium tin oxide (ITO).
Claim 21
Dependent Claim
20 words
The active matrix for a liquid crystal display of claim 11 wherein the plurality gate lines are comprised of polysilicon.
Claim 22
Dependent Claim
23 words
The active matrix for a liquid crystal display of claim 11 wherein the plurality gate lines are comprised of a refractory metal silicide.
References Cited (Backward Citations)
US4740782A
Cited
JPS6370832A
Cited
US5245452A
Cited
US5296396A
Cited
US4927777A
Cited
US5343216A
Cited
JPH04106532A
Cited
US5309393A
Cited
US5237436A
Cited
US5349453A
Cited
US5233448A
Cited
US5483082A
Cited
US5396261A
Cited
US5319480A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-08-13 | 2000-02-12 | 2000-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-08-13 | 2004-02-12 | 2004-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-08-13 | 2008-02-12 | 2008-08-13 | $7700.00 | Window Closed / Lapsed |