US4325002A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Luminescent screen for flat image display devices
Assignee: Siemens AG
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Filing: 1979-12-11
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Granted: 1982-04-13
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Expires: 1999-12-11
Abstract
Abstract A luminescent screen for flat image display devices, having improved light efficiency comprises a glass screen (1) provided on its inner surface with a pattern of recesses (2) corresponding to a desired luminescent dot pattern with luminescent dot surfaces (5) positioned not only along the bottom of such recesses but also along the upwardly extending recess walls and a contrasting border layer (3) is positioned on the land areas between each recess. In producing such screens, the contrasting border layer is utilized as an etch mask for the recesses and as an application mask for the luminescent material.
Inventors
- 👤 Manfred Kobale
- 👤 Hans P. Lorenz
- 👤 Kaspar Weingand
- 👤 Rolf Wengert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:20
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/30; H01J29/32; H01J29/24; H01J9/00; H01J9/20; H01J9/22; H01J9/227; H01J9/2271
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
142 words
In a luminescent screen for flat image display devices having a glass screen plate with a pattern of luminescent points thereon with the surfaces of such luminescent points being separated from one another by a contrasting border layer, the improvement comprising wherein: said glass screen plate is provided with a pattern of recesses on an inner surface thereof corresponding to said pattern of luminescent points; a luminescent material layer is positioned in each of said recesses along the bottom thereof as well as on the upwardly extending walls thereof; and a contrasting border layer is positioned on land areas between each of said recesses, said border layer at a surface layer thereof adjacent said glass surface plate being substantially pure dielectric material and at an outermost surface thereof being substantially pure metal, with a gradually increasing amount of metal between such surfaces.
Claim 2
Dependent Claim
142 words
In a luminescent screen for flat image display devices having a glass screen plate with a pattern of luminescent points thereon with the surfaces of such luminescent points being separated from one another by a contrasting border layer, the improvement comprising wherein: said glass screen plate is provided with a pattern of recesses on an inner surface thereof corresponding to said pattern of luminescent points; a luminescent material layer is positioned in each of said recesses along the bottom thereof as well as on the upwardly extending walls thereof; and a contrasting border layer is positioned on land areas between each of said recesses, said border layer at a surface layer thereof adjacent said glass surface plate being substantially pure dielectric material and at an outermost surface thereof being substantially pure metal, with a gradually increasing amount of metal between such surfaces.
Claim 3
Dependent Claim
28 words
In a luminescent screen as defined in claim 1 wherein a continuous electrically conductive layer is positioned over said contrasting border layer and beneath said luminescent material layer.
Claim 4
Dependent Claim
42 words
In a luminescent screen as defined in claim 1 wherein said metal is selected from the group consisting of nickel, copper, platinum and gold and said dielectric material is selected from the group consisting of cerium oxide, aluminum oxide and silicon oxide.
Claim 5
Dependent Claim
14 words
In a luminescent screen as defined in claim 3 wherein said metal is nickel.
Claim 6
Dependent Claim
140 words
In a luminescent screen for flat image display devices having a glass screen plate with a pattern of luminescent points thereon with the surfaces of such luminescent points being separated from one another by a contrasting border layer, the improvement comprising wherein: said glass screen plate is provided with a pattern of recesses on an inner surface thereof corresponding to said pattern of luminescent points; a luminescent material layer is positioned in each of said recesses along the bottom thereof as well as on the upwardly extending walls thereof; and a contrasting border layer is positioned on land areas between each of said recesses and is composed of a plurality of alternating layers, each composed of different mixtures of a metal and dielectric material and each layer being of a different thickness, with the outermost layer being a metal layer.
Claim 7
Dependent Claim
140 words
In a luminescent screen for flat image display devices having a glass screen plate with a pattern of luminescent points thereon with the surfaces of such luminescent points being separated from one another by a contrasting border layer, the improvement comprising wherein: said glass screen plate is provided with a pattern of recesses on an inner surface thereof corresponding to said pattern of luminescent points; a luminescent material layer is positioned in each of said recesses along the bottom thereof as well as on the upwardly extending walls thereof; and a contrasting border layer is positioned on land areas between each of said recesses and is composed of a plurality of alternating layers, each composed of different mixtures of a metal and dielectric material and each layer being of a different thickness, with the outermost layer being a metal layer.
Claim 8
Dependent Claim
28 words
In a luminescent screen as defined in claim 5 wherein a continuous electrically conductive layer is positioned over said contrasting border layer and beneath said luminescent material layer.
Claim 9
Dependent Claim
14 words
In a luminescent screen as defined in claim 6 wherein said metal is nickel.
Claim 10
Dependent Claim
42 words
In a luminescent screen as defined in claim 5 wherein said metal is selected from the group consisting of nickel, copper, platinum and gold and said dielectric material is selected from a group consisting of cerium oxide, aluminum oxide and silicon oxide.
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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) | 1985-04-12 | 1985-10-12 | 1986-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-12 | 1989-10-12 | 1990-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-12 | 1993-10-12 | 1994-04-13 | $7700.00 | Window Closed / Lapsed |