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US4987339A
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US
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Enhanced single layer multi-color luminescent display with coactivators
Assignee: National Aeronautics and Space Administration
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Filing: 1989-04-13
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Granted: 1991-01-22
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Expires: 2009-04-13
Abstract
Abstract The invention is an enhanced single-layer, multi-color luminescent display 10' comprising an insulator substrate 11' and a single layer of host material 13' having a smooth, flat top surface deposited thereon that hosts one or more different activators, therein forming a pattern of selected and distinctly colored phosphor areas 14', 16' and 17' which may be green, red and blue respectively in the single layer of host material 13'. Transparent electrical conductor means 12' may be provided for subjecting selected areas of the pattern of colored phosphor areas to an electric field thereby forming a multi-color, single layer electroluminescent display. A coactivator such as phosphorus (P) may be selectively introduced into one or more of the phosphor areas 16' and 17' to enhance the brilliance of the color or colors of the one or more selected phosphor areas without changing the electric field. A method of forming a multi-color luminescent display incudes the steps of depositing on an insulator substrate 10', a single layer of host material 12' with the properties to host varying quantities of different activators and a common activator into selected areas 14', 16' and 17' of said single layer of host material 12' as by thermal diffusion or ion-implementation to form a pattern of phosphor areas 16' and 1740 of selectively enhanced colors in said single layer of host material 12'.
Inventors
- 👤 James B. Robertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:07
CPC Classifications
H; H05; H05B; H05B33/00; H05B33/12; H05B33/14; H05B33/145; H05B33/10; H05B33/18
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
81 words
An enhanced, single-layer multi-color luminescent surface comprising: an insulator substrate; a single layer of host material having a smooth top surface on said substrate, said single layer of host material including different activators within selected areas therein forming a pattern of one or more phosphor areas of selected and distinct colors within said single layer of host material; and a coactivator selectively introduced into one or more or said phosphor areas thereby enhancing the brilliance of the color of colors thereof.
Claim 2
Dependent Claim
81 words
An enhanced, single-layer multi-color luminescent surface comprising: an insulator substrate; a single layer of host material having a smooth top surface on said substrate, said single layer of host material including different activators within selected areas therein forming a pattern of one or more phosphor areas of selected and distinct colors within said single layer of host material; and a coactivator selectively introduced into one or more or said phosphor areas thereby enhancing the brilliance of the color of colors thereof.
Claim 3
Dependent Claim
16 words
The invention as defined in claim 1 wherein said single-layer of host material is a phosphor.
Claim 4
Dependent Claim
22 words
The invention as defined in claim 1 including an insulating layer over said smooth top surface of said single-layer of host material.
Claim 5
Dependent Claim
36 words
The invention as defined in claim 3 including electrical conductor means for subjecting selected phosphor areas of said pattern of phosphor areas of different colors to an electric field thereby forming a multi-color, single-layer electroluminescent display.
Claim 6
Dependent Claim
104 words
An enhanced single-layer, multi-color electroluminescent display including electrical conductor means for subjecting selected phosphor areas of different colors in said display to an electric field to display the colors of said selected phosphor areas, the improvement comprising: a single layer of host material having a smooth top surface and one or more different activators within said selected areas, said different activators forming a pattern of two or more phosphor areas of different colors within said single layer of host material; and a coactivator selectively introduced into said phosphor areas thereby enhancing the brilliance of the respective colors thereof when subjected to said electric field.
Claim 7
Dependent Claim
104 words
An enhanced single-layer, multi-color electroluminescent display including electrical conductor means for subjecting selected phosphor areas of different colors in said display to an electric field to display the colors of said selected phosphor areas, the improvement comprising: a single layer of host material having a smooth top surface and one or more different activators within said selected areas, said different activators forming a pattern of two or more phosphor areas of different colors within said single layer of host material; and a coactivator selectively introduced into said phosphor areas thereby enhancing the brilliance of the respective colors thereof when subjected to said electric field.
Claim 8
Dependent Claim
53 words
The invention as defined in claim 5 wherein said single layer of host material is formed of ZnS, and said activators hosted therein are Mg, TbF 3 and Mn thereby forming three different colored phosphors in said single layer of host material, namely: ZnS:Mg (blue); ZnS:TbF 3 (green); and ZnS:Mn:TbF 3 (red) respectively.
Claim 9
Dependent Claim
12 words
The invention as defined in claim 5 wherein said coactivator is phosphorus.
Claim 10
Dependent Claim
61 words
The invention as defined in claim 5 wherein said single layer of host material is formed of SrS, said activators hosted therein are Ce 2 S 3 and CeF 3 forming two different phosphor areas of different colors therein, namely: SrS:Ce 2 S 3 (red) and SrS:CeF 3 (green); and said coactivator selectively introduced into said phosphor areas is phosphorus (P).
Claim 11
Dependent Claim
53 words
The invention as defined in claim 7 wherein said single layer of host material is formed of ZnS, and said activators hosted therein are Mg, TbF 3 and Mn thereby forming three different colored phosphors in said single layer of host material, namely: ZnS:Mg (blue); ZnS:TbF 3 (green); and ZnS:Mn:TbF 3 (red) respectively.
Claim 12
Dependent Claim
61 words
The invention as defined in claim 7 wherein said single layer of host material is formed of SrS, said activators hosted therein are Ce 2 S S and CeF 3 forming two different phosphor areas of different colors therein, namely: SrS:Ce 2 S 3 (red) and SrS:CeF 3 (green); and said coactivator selectively introduced into said phosphor areas is phosphorous (P).
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) | 1994-01-21 | 1994-07-23 | 1995-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-01-21 | 1998-07-23 | 1999-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-01-21 | 2002-07-23 | 2003-01-22 | $7700.00 | Window Closed / Lapsed |