US4826727A
Expired / Lapsed
US
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Phosphorescent material for electroluminescent display, comprising silver sulfide in copper sulfide coating on phosphor particles and/or elemental sulfur in dielectric binder for phosphor particles
Assignee: Cherry Corp
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Filing: 1987-04-14
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Granted: 1989-05-02
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Expires: 2007-04-14
Abstract
Abstract Electroluminescent display panels comprising copper sulfide coated Zns:Mn phosphor powder, bonded in an organic dielectric binder, can be provided with increased useful lives by incorporating (1) silver in the copper sulfide coating on the ZnS:Mn phosphor powder, in an amount of 2 to 12%, by weight of the copper in the copper sulfide coating; and (2) elemental sulfur in the dielectric binder, in an amount of 0.1 to 3%, by weight of the phosphor particles. The additives can be used independently or together, preferably together. Methods of incorporating the additives are also disclosed.
Inventors
- 👤 David Glaser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:16
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/02; C09K11/025; H; H05; H05B; H05B33/00; H05B33/10; H05B33/12; H05B33/14; H05B33/20; H05B33/22; Y; Y10; Y10S; Y10S428/00; Y10S428/917; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
89 words
In a phosphorescent material for electroluminescent display, comprising: (a) phosphor particles of a size from about 0.1 to about 2.5 microns, comprising zinc sulfide containing from about 0.1 to about 1.0% by weight manganese; (b) a coating of copper sulfide on the phosphor particles; and (c) a dielectric binder; the improvement which comprises the addition, in the coating of copper sulfide on the phosphor particles, of from about 2 to about 12%, of silver, by weight of the copper in the coating of copper sulfide on the phosphor particles.
Claim 2
Dependent Claim
89 words
In a phosphorescent material for electroluminescent display, comprising: (a) phosphor particles of a size from about 0.1 to about 2.5 microns, comprising zinc sulfide containing from about 0.1 to about 1.0% by weight manganese; (b) a coating of copper sulfide on the phosphor particles; and (c) a dielectric binder; the improvement which comprises the addition, in the coating of copper sulfide on the phosphor particles, of from about 2 to about 12%, of silver, by weight of the copper in the coating of copper sulfide on the phosphor particles.
Claim 3
Dependent Claim
17 words
A material according to claim 1, wherein the phosphor particles also comprise about 0.05% by weight copper.
Claim 4
Dependent Claim
13 words
A material according to claim 1, wherein the phosphor contains about 0.4% manganese.
Claim 5
Dependent Claim
14 words
A material according to one of claims 1-3, wherein the dielectric binder is organic.
Claim 6
Dependent Claim
14 words
A material according to one of claims 1-3, wherein the dielectric binder is nitrocellulose.
Claim 7
Dependent Claim
44 words
A material according to one of claims 1-3, wherein the amount of silver in the coating of copper sulfide on the phosphor particles is from about 5 to 10%, by weight of the copper in the coating of copper sulfide on the phosphor particles.
Claim 8
Dependent Claim
41 words
A material according to one of claims 1-3, wherein the amount of silver in the coating of copper sulfide on the phosphor particles is about 8%, by weight of the copper in the coating of copper sulfide on the phosphor particles.
Claim 9
Dependent Claim
31 words
A material according to one of claims 1-3, comprising in addition, in the dielectric binder, of from about 0.1 to about 3% of elemental sulfur, by weight of the phosphor particles.
Claim 10
Dependent Claim
23 words
A material according to claim 8, wherein the amount of sulfur is from about 0.1 to 0.3% by weight of the phosphor particles.
Claim 11
Dependent Claim
20 words
A material according to claim 8, wherein the amount of sulfur is about 0.2% by weight of the phosphor particles.
Claim 12
Dependent Claim
116 words
A phosphorescent material for electroluminescent display, comprising: (a) phosphor particles of a size from about 0.1 to about 2.5 microns, comprising (i) an inner portion comprising (1) from about 0.1 to about 1.0% manganese, (2) from 0 to about 0.05% copper, and (3) the balance zinc sulfide; and (ii) a surface coating of (1) from about 88 to about 98% by weight of copper sulfide, and (2) from about 2 to 12% by weight of silver sulfide; (b) from about 5 to about 10%, by weight of the phosphor particles, of a dielectric nitrocellulose binder; and (c) from 0 to about 3%, by weight of the phosphor particles, of elemental sulfur, in the dielectric nitrocellulose binder.
Claim 13
Dependent Claim
116 words
A phosphorescent material for electroluminescent display, comprising: (a) phosphor particles of a size from about 0.1 to about 2.5 microns, comprising (i) an inner portion comprising (1) from about 0.1 to about 1.0% manganese, (2) from 0 to about 0.05% copper, and (3) the balance zinc sulfide; and (ii) a surface coating of (1) from about 88 to about 98% by weight of copper sulfide, and (2) from about 2 to 12% by weight of silver sulfide; (b) from about 5 to about 10%, by weight of the phosphor particles, of a dielectric nitrocellulose binder; and (c) from 0 to about 3%, by weight of the phosphor particles, of elemental sulfur, in the dielectric nitrocellulose binder.
Claim 14
Dependent Claim
20 words
A material according to claim 11, wherein the amount of nitrocellulose is about 7%, by weight of the phosphor particles.
Claim 15
Dependent Claim
16 words
A material according to claim 11, wherein the phosphor particles contain about 0.05% by weight copper.
Claim 16
Dependent Claim
14 words
A material according to claim 11, wherein the phosphor particles contain about 0.04% manganese.
Claim 17
Dependent Claim
36 words
A material according to claim 11, wherein the amount of silver sulfide in the coating on the phosphor particles is from about 5 to 10%, by weight of copper in the coating of the phosphor particles.
Claim 18
Dependent Claim
34 words
A material according to claim 11, wherein the amount of silver sulfide in the coating on the phosphor particles is about 8%, by weight of copper sulfide in the coating on the phosphor particles.
Claim 19
Dependent Claim
31 words
A material according to one of claims 11-16, wherein the amount of sulfur in the dielectric nitrocellulose binder is from about 0.1 to about 3.0% by weight of the phosphor particles.
Claim 20
Dependent Claim
31 words
A material according to one of claims 11-16, wherein the amount of sulfur in the dielectric nitrocellulose binder is from about 0.1 to about 0.3% by weight of the phosphor particles.
Claim 21
Dependent Claim
27 words
A material according to one of claims 11-16, wherein the amount of sulfur in the dielectric nitrocellulose binder is about 0.2% by weight of the phosphor particles.
Claim 22
Dependent Claim
115 words
A phosphorescent material for electroluminescent display, comprising: (a) phosphor particles of a size from about 0.1 to about 2.5 microns, comprising (i) an inner portion comprising (1) from about 0.1 to about 1.0% manganese, (2) from 0 to about 0.05% copper, and (3) the balance zinc sulfide; and (ii) a surface coating of (1) from about 88 to 100% by weight of copper sulfide, and (2) from 0 to 12% by weight of silver sulfide; (b) from about 5 to about 10%, by weight of the phosphor particles, of a dielectric nitrocellulose binder; and (c) from about 1 to about 3%, by weight of the phosphor particles, of elemental sulfur, in the dielectric nitrocellulose binder.
Claim 23
Dependent Claim
115 words
A phosphorescent material for electroluminescent display, comprising: (a) phosphor particles of a size from about 0.1 to about 2.5 microns, comprising (i) an inner portion comprising (1) from about 0.1 to about 1.0% manganese, (2) from 0 to about 0.05% copper, and (3) the balance zinc sulfide; and (ii) a surface coating of (1) from about 88 to 100% by weight of copper sulfide, and (2) from 0 to 12% by weight of silver sulfide; (b) from about 5 to about 10%, by weight of the phosphor particles, of a dielectric nitrocellulose binder; and (c) from about 1 to about 3%, by weight of the phosphor particles, of elemental sulfur, in the dielectric nitrocellulose binder.
Claim 24
Dependent Claim
20 words
A material according to claim 20, wherein the amount of nitrocellulose is about 7%, by weight of the phosphor particles.
Claim 25
Dependent Claim
17 words
A material according to claim 20, wherein the phosphor particles also contain about 0.05% by weight copper.
Claim 26
Dependent Claim
14 words
A material according to claim 20, wherein the phosphor particles contain about 0.4% manganese.
Claim 27
Dependent Claim
31 words
A material according to one of claims 20-23, wherein the amount of sulfur in the dielectric nitrocellulose binder is from about 0.1 to about 3.0% by weight of the phosphor particles.
Claim 28
Dependent Claim
31 words
A material according to one of claims 20-23, wherein the amount of sulfur in the dielectric nitrocellulose binder is from about 0.1 to about 0.3% by weight of the phosphor particles.
Claim 29
Dependent Claim
27 words
A material according to one of claims 20-23, wherein the amount of sulfur in the dielectric nitrocellulose binder is about 0.2% by weight of the phosphor particles.
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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) | 1992-05-01 | 1992-10-31 | 1993-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-01 | 1996-10-31 | 1997-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-01 | 2000-10-31 | 2001-05-02 | $7700.00 | Window Closed / Lapsed |