Patent US4715685A successfully refreshed from Google Patents.
US4715685A
Expired / Lapsed
US
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Liquid crystal display having potential source in a diode ring
Assignee: Guardian Industries Corp
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Filing: 1985-03-04
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Granted: 1987-12-29
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Expires: 2005-03-04
Abstract
Abstract A dynamic memory array includes plural sets of spaced apart address lines and storage locations defined by cross-overs of members of the plural sets of address lines. At each storage location a charge storage means is coupled to a threshold means. The charge storage means are addressable through the threshold means by the application of selected potentials to the plural sets of address lines. The charge storage means and the threshold means can be formed as vertically arrayed, deposited, layers of semiconductor materials, and preferably from amorphous semiconductor alloys. Also disclosed is a light influencing display having an improved bidirectional threshold isolation means.
Inventors
- 👤 Zvi Yaniv
- 👤 Vincent D. Canella
- 👤 Walter E. Chapelle
- 👤 Roger W. Pryor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:44
CPC Classifications
G; G11; G11C; G11C13/00; G11C13/0002; G11C13/0021; G11C13/003; G11C11/00; G11C11/21; G11C11/24; G11C13/0009; H; H10; H10B; H10B12/00; G11C2213/00; G11C2213/30; G11C2213/33; G11C2213/70; G11C2213/72; G11C2213/74; G11C2213/76
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
187 words
A light influencing display comprising: a plurality of pixels, at least one pixel including a pair of electrodes, at least one of said electrodes being light transmissive; isolation means coupled to one of said electrodes to enable the selective application of driving potentials across said electrodes; and light influencing material disposed between said electrodes; said isolation means including bidirectional threshold means for establishing first and second threshold voltages of opposite polarity and including a first threshold device having a first threshold voltage, and a second threshold device having a second threshold voltage, said first and second threshold devices being coupled together in a ring to establish first and second threshold voltages of opposite polarity; and first and second photovoltaic potential sources coupled in series with said first and second threshold devices respectively, said first threshold device being in series with said first photovoltaic potential source in the ring and said second second threshold device being in series with said second photovoltaic potential source in the ring for back biasing said first and second threshold devices and increasing the absolute magnitude of said first and second threshold voltages.
Claim 2
Dependent Claim
187 words
A light influencing display comprising: a plurality of pixels, at least one pixel including a pair of electrodes, at least one of said electrodes being light transmissive; isolation means coupled to one of said electrodes to enable the selective application of driving potentials across said electrodes; and light influencing material disposed between said electrodes; said isolation means including bidirectional threshold means for establishing first and second threshold voltages of opposite polarity and including a first threshold device having a first threshold voltage, and a second threshold device having a second threshold voltage, said first and second threshold devices being coupled together in a ring to establish first and second threshold voltages of opposite polarity; and first and second photovoltaic potential sources coupled in series with said first and second threshold devices respectively, said first threshold device being in series with said first photovoltaic potential source in the ring and said second second threshold device being in series with said second photovoltaic potential source in the ring for back biasing said first and second threshold devices and increasing the absolute magnitude of said first and second threshold voltages.
Claim 3
Dependent Claim
16 words
A display as defined in claim 1 wherein said light influencing material is liquid crystal material.
Claim 4
Dependent Claim
18 words
A display as defined in claim 2 wherein said liquid crystal material comprises a nematic liquid crystal material.
Claim 5
Dependent Claim
16 words
A display as defined in claim 1 wherein said light transmissive electrode comprises indium tin oxide.
Claim 6
Dependent Claim
18 words
A display as defined in claim 1 wherein said threshold devices are formed from a deposited semiconductor material.
Claim 7
Dependent Claim
17 words
A display as defined in claim 5 wherein said deposited semiconductor material comprises an amorphous semiconductor alloy.
Claim 8
Dependent Claim
14 words
A display as defined in claim 6 wherein said amorphous semiconductor alloy includes silicon.
Claim 9
Dependent Claim
14 words
A display as defined in claim 6 wherein said amorphous semiconductor alloy includes fluorine.
Claim 10
Dependent Claim
14 words
A display as defined in claim 6 wherein said amorphous semiconductor alloy includes hydrogen.
Claim 11
Dependent Claim
13 words
A display as defined in claim 1 wherein said threshold devices comprise diodes.
Claim 12
Dependent Claim
35 words
A display as defined in claim 10 wherein each said diode comprises a first doped region, a substantially intrinsic region, and a second doped region opposite in conductivity with respect to said first doped region.
Claim 13
Dependent Claim
18 words
A display as defined in claim 1 wherein said photovoltaic potential sources are formed from deposited semiconductor material.
Claim 14
Dependent Claim
17 words
A display as defined in claim 12 wherein said deposited semiconductor material comprises an amorphous semiconductor alloy.
Claim 15
Dependent Claim
14 words
A display as defined in claim 13 wherein said amorphous semiconductor alloy includes silicon.
Claim 16
Dependent Claim
15 words
A display as defined in claim 14 wherein said amorphous semiconductor alloy further includes hydrogen.
Claim 17
Dependent Claim
15 words
A display as defined in claim 14 wherein said amorphous semiconductor alloy further includes fluorine.
Claim 18
Dependent Claim
27 words
A display as defined in claim 12 wherein said photovoltaic devices comprise a first doped semiconductor layer, an intrinsic semiconductor layer, and a second doped semiconductor layer.
Claim 19
Dependent Claim
19 words
A display as defined in claim 17 wherein said first and second doped semiconductor layers are of opposite conductivity.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1990-12-28 | 1991-06-29 | 1991-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-28 | 1995-06-29 | 1995-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-28 | 1999-06-29 | 1999-12-29 | $7700.00 | Window Closed / Lapsed |