US5061040A
Expired / Lapsed
US
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Liquid crystal displays operated by amorphous silicon alloy diodes
Assignee: Ovonic Imaging Systems Inc
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Filing: 1989-09-28
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Granted: 1991-10-29
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Expires: 2009-09-28
Abstract
Abstract There are disclosed liquid crystal displays each having at least one pixel element formed on an insulative substrate including at least two conductive electrodes and liquid crystal display material disposed between the electrodes. The pixel elements further include at least a pair of isolation devices formed from a deposited semiconductor material which facilitates selective excitation of of the pixel elements and applied potential reversal across the electrodes during alternate display frames. The isolation devices can include a plurality of series connected diodes. The isolation devices can be formed as diode rings. A method of making the displays is also disclosed.
Inventors
- 👤 Zvi Yaniv
- 👤 Vincent D. Cannella
- 👤 Gregory L. Hansell
- 👤 Louis D. Swartz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:58
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/136; G02F1/1362; G02F1/1365; G02F2202/00; G02F2202/10; G02F2202/103
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
129 words
In a multi-pixel display, each pixel of said display includes (1) first and second pixel electrodes with light influencing material disposed therebetween; (2) first and second sets of silicon isolation devices; and (3) first and second address leads disposed in substantially parallel relation to one another; a first terminal of said first set of isolation devices electrically connected to the first address lead and a second terminal of said first set electrically connected to the first pixel electrode; a first terminal of said second set of isolation devices electrically connected to the second address lead and a second terminal of said second set electrically connected to the first pixel electrode, the improvement comprising, in combination: both the first and second sets including a plurality of series connected isolation devices.
Claim 2
Dependent Claim
129 words
In a multi-pixel display, each pixel of said display includes (1) first and second pixel electrodes with light influencing material disposed therebetween; (2) first and second sets of silicon isolation devices; and (3) first and second address leads disposed in substantially parallel relation to one another; a first terminal of said first set of isolation devices electrically connected to the first address lead and a second terminal of said first set electrically connected to the first pixel electrode; a first terminal of said second set of isolation devices electrically connected to the second address lead and a second terminal of said second set electrically connected to the first pixel electrode, the improvement comprising, in combination: both the first and second sets including a plurality of series connected isolation devices.
Claim 3
Dependent Claim
26 words
A display as defined in claim 1 wherein said first plurality of series connected isolation devices is formed on a region of said first address line.
Claim 4
Dependent Claim
26 words
A display as defined in claim 1 wherein said second plurality of series connected isolation devices is formed on a region of said first pixel electrode.
Claim 5
Dependent Claim
19 words
A display as defined in claim 1 wherein said first and second sets of isolation devices are vertically arrayed.
Claim 6
Dependent Claim
16 words
A display as defined in claim 1 wherein each of said isolation devices is a diode.
Claim 7
Dependent Claim
20 words
A display as defined in claim 5 wherein the amorphous silicon from which said isolation devices are fabricated includes hydrogen.
Claim 8
Dependent Claim
14 words
A display as defined in claim 6 wherein said amorphous silicon further includes fluorine.
Claim 9
Dependent Claim
56 words
A display as defined in claim 5 wherein said isolation diodes each includes a first doped amorphous silicon alloy region, an intrinsic amorphous silicon alloy region overlying said first doped region, and a second doped amorphous silicon alloy region overlying said intrinsic region, said first and second doped amorphous silicon alloy regions being opposite in conductivity.
Claim 10
Dependent Claim
21 words
A display as defined in claim 1 wherein said first and second pixel electrodes are formed from a transparent conductive material.
Claim 11
Dependent Claim
16 words
A display as defined in claim 9 wherein said transparent conductive material is indium tin oxide.
Claim 12
Dependent Claim
16 words
A display as defined in claim 1 wherein said light influencing material is liquid crystal material.
Claim 13
Dependent Claim
17 words
A display as defined in claim 11 wherein said liquid crystal material is nematic liquid crystal material.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-10-28 | 1995-04-29 | 1995-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-28 | 1999-04-29 | 1999-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-28 | 2003-04-29 | 2003-10-29 | $7700.00 | Window Closed / Lapsed |