US4137481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroluminescent phosphor panel
Assignee: UK Secretary of State for Defence
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Filing: 1977-10-18
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Granted: 1979-01-30
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Expires: 1997-10-18
Abstract
Abstract A d.c. electroluminescent panel comprises a transparent substrate, a transparent first electrode film, a phosphor layer, and a second electrode film. Application of a voltage across the phosphor layer causes it to emit light. In this invention the phosphor layer is produced in two layers, a first semi-insulating thin layer of activator doped phosphor and a second electrically conducting layer of phosphor.
Inventors
- 👤 Cyril Hilsum
- 👤 John Kirton
- 👤 Adrian L. Mears
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:15
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/14; H05B33/145
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
52 words
An electroluminescent phosphor panel suitable for unidirectional voltage operations comprising in serial order, a transparent electrically insulating substrate, a transparent first electrode film, a first layer of semi-insulating activator doped phosphor with an average thickness less than 5 microns, a second layer of an electrically conducting phosphor, and a second electrode film.
Claim 2
Dependent Claim
52 words
An electroluminescent phosphor panel suitable for unidirectional voltage operations comprising in serial order, a transparent electrically insulating substrate, a transparent first electrode film, a first layer of semi-insulating activator doped phosphor with an average thickness less than 5 microns, a second layer of an electrically conducting phosphor, and a second electrode film.
Claim 3
Dependent Claim
13 words
A panel according to claim 1 wherein the second layer is activator doped.
Claim 4
Dependent Claim
45 words
A panel according to claim 1 wherein the phosphor of the first and second layers is a material selected from the group containing zinc sulphide, zinc selenium, a zinc sulphide-zinc selenium alloy, zinc oxide, a zinc sulphide, zinc oxide alloy, and a sulphide of copper.
Claim 5
Dependent Claim
26 words
A panel according to claim 3 wherein the activator is an element chosen from the group containing manganese, lead, zirconium, vanadium, chromium, molybdenum, uranium, and terbium.
Claim 6
Dependent Claim
21 words
A panel according to claim 4 wherein the phosphor of the second layer is granular in form with copper coated grains.
Claim 7
Dependent Claim
20 words
A panel according to claim 4 wherein the thickness of the first layer is between 200° A and 1 micron.
Claim 8
Dependent Claim
19 words
A panel according to claim 4 wherein the resistivity of the first layer is greater than 10 9 ohm-cm.
Claim 9
Dependent Claim
19 words
A panel according to claim 4 wherein the resistivity of the second layer is less than 10 4 ohm-cm.
Claim 10
Dependent Claim
32 words
A panel according to claim 4 and further comprising an encapsulating jacket fixed to the substrate and covering the first and second layers and at least part of the second electrode film.
Claim 11
Dependent Claim
15 words
A panel according to claim 1 wherein the first layer comprises several sublayers separately deposited.
Claim 12
Dependent Claim
101 words
An electroluminescent phosphor panel suitable for unidirectional voltage operation comprising in serial order, a transparent electrically insulating substrate, a transparent first electrole film, a first layer of semi-insulating manganese doped zinc sulphide with an average thickness between 200 A and 1 micron and a resistivity greater than 10 9 ohm-cm, a second layer of an electrically conducting manganese doped zinc sulphide containing copper and having the resistivity less than 10 4 ohms-cm, a second electrode film, and an encapsulating jacket fixed to the substrate to cover the first and second layers and at least part of the first and second films.
Claim 13
Dependent Claim
101 words
An electroluminescent phosphor panel suitable for unidirectional voltage operation comprising in serial order, a transparent electrically insulating substrate, a transparent first electrole film, a first layer of semi-insulating manganese doped zinc sulphide with an average thickness between 200 A and 1 micron and a resistivity greater than 10 9 ohm-cm, a second layer of an electrically conducting manganese doped zinc sulphide containing copper and having the resistivity less than 10 4 ohms-cm, a second electrode film, and an encapsulating jacket fixed to the substrate to cover the first and second layers and at least part of the first and second films.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-29 | 1982-07-31 | 1983-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-29 | 1986-07-31 | 1987-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-29 | 1990-07-31 | 1991-01-30 | $7700.00 | Window Closed / Lapsed |