US3796909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroluminescent storage display
Assignee: International Business Machines Corp
•
Filing: 1972-06-15
•
Granted: 1974-03-12
•
Expires: 1992-06-15
Abstract
Abstract A bistable storage and display tube using an electroluminescent layer capable of storing an ''''on'''' charge pattern, created by an electron write gun, on the inner surface thereof. An electron flood gun is employed to clamp the potential of the inner surface of the electroluminescent layer, in the ''''on'''' regions where a charge pattern is created, to the potential of a collector electrode. An a.c. signal applied to the electroluminescent layer, via a transparent conductive layer in contact with the outer surface thereof, acts to develop an alternating field across the layer in the ''''on'''' regions, to thereby produce luminescence thereat.
Inventors
- 👤 I Chang
- 👤 W Pennebaker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:20
CPC Classifications
H; H05; H05B; H05B33/00; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/182; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J31/122
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
194 words
In a cathode ray type storage display device having a higher energy electron write gun, electron flood gun means and a write surface means capable of retaining a charge pattern written by said write gun, the improvement comprising: means included in said write surface means to produce a visible change at selected points on the viewing surface thereof according to a charge pattern written by said write gun thereon, with said visible change occurring in response to an a.c. signal applied to the said selected points, said means included in said write surface means also acting to produce secondary electron emission at said selected points in response to electrons from said flood gun means entering said write surface means at said selected points according to said charge pattern; means for applying an a.c. signal to said write surface means; and collector electrode means positioned adjacent said write surface means for collecting the said secondary electrons emitted from said selected points and causing said selected points to become clamped in potential to the potential of said collector electrode means so as to cause said a.c. signal to be developed thereat to produce said visible change.
Claim 2
Dependent Claim
194 words
In a cathode ray type storage display device having a higher energy electron write gun, electron flood gun means and a write surface means capable of retaining a charge pattern written by said write gun, the improvement comprising: means included in said write surface means to produce a visible change at selected points on the viewing surface thereof according to a charge pattern written by said write gun thereon, with said visible change occurring in response to an a.c. signal applied to the said selected points, said means included in said write surface means also acting to produce secondary electron emission at said selected points in response to electrons from said flood gun means entering said write surface means at said selected points according to said charge pattern; means for applying an a.c. signal to said write surface means; and collector electrode means positioned adjacent said write surface means for collecting the said secondary electrons emitted from said selected points and causing said selected points to become clamped in potential to the potential of said collector electrode means so as to cause said a.c. signal to be developed thereat to produce said visible change.
Claim 3
Dependent Claim
34 words
The display device as set forth in claim 1 wherein means included in said write surface means comPrises electroluminescent material held in a dielectric binder to form an insulating layer at said write surface.
Claim 4
Dependent Claim
37 words
The display device as set forth in claim 2 wherein said means for applying an a.c. signal to the said insulating layer comprises a transparent conductive layer in contact with the viewing side of said insulating layer.
Claim 5
Dependent Claim
215 words
A storage display tube device comprising: storage means including a layer of storage material means having an inner write surface and an outer display surface thereof and being responsive at selected local regions on said inner surface to electrons provided thereto to produce secondary electron emission on at least the said inner surface thereof, said storage material means further being responsive to an a.c. signal applied to the said selected local regions thereof to produce a visible change on the said outer display surface thereof; means to apply an a.c. signal to said storage material means; collector electrode means positioned adjacent the said inner surface of said storage material means for collecting electrons; electron write gun means for selectively writing a charge storage image pattern at said local regions on the said inner surface of said storage material means; and electron flood gun means for flooding the said charge storage image pattern with electrons to cause said storage material means to produce secondary electron emission at said local regions and clamp the potential thereat to the potential of said collector electrode means such as to cause the said a.c. signal applied to said storage material means to produce the said visible change on the said outer display surface, according to said charge storage image pattern.
Claim 6
Dependent Claim
215 words
A storage display tube device comprising: storage means including a layer of storage material means having an inner write surface and an outer display surface thereof and being responsive at selected local regions on said inner surface to electrons provided thereto to produce secondary electron emission on at least the said inner surface thereof, said storage material means further being responsive to an a.c. signal applied to the said selected local regions thereof to produce a visible change on the said outer display surface thereof; means to apply an a.c. signal to said storage material means; collector electrode means positioned adjacent the said inner surface of said storage material means for collecting electrons; electron write gun means for selectively writing a charge storage image pattern at said local regions on the said inner surface of said storage material means; and electron flood gun means for flooding the said charge storage image pattern with electrons to cause said storage material means to produce secondary electron emission at said local regions and clamp the potential thereat to the potential of said collector electrode means such as to cause the said a.c. signal applied to said storage material means to produce the said visible change on the said outer display surface, according to said charge storage image pattern.
Claim 7
Dependent Claim
92 words
The storage device as set forth in claim 4 wherein said layer of storage material means comprises a first transparent conductive layer on the said outer display surface thereof and second electroluminescent material layer means in contact with said conductive layer and arranged to provide said secondary emission on the said inner surface thereof in response to said electrons attracted to the charge storage image pattern thereon so as to thereby provide electroluminescence at said selected regions on said display surface in response to said a.c. signal applied to said conductive layer.
Claim 8
Dependent Claim
24 words
The device as set forth in claim 4 wherein said layer of storage material means is all within the said tube of said device.
Claim 9
Dependent Claim
27 words
The device as set forth in claim 6 wherein said collector electrode means is in the form of a conductive grid positioned adjacent the said inner surface.
Claim 10
Dependent Claim
34 words
The device as set forth in claim 7 wherein said means to apply an a.c. signal includes DC bias means arranged to DC bias said electroluminescent material so as to reduce leakage current therefrom.
Claim 11
Dependent Claim
22 words
The device as set forth in claim 5 wherein said storage material means is all within the said tube of said device.
Claim 12
Independent Claim
188 words
A method of operating a cathode ray type storage and display tube device having an electron write gun means, electron flood gun means and an insulating layer at the display surface thereof for storing a charge pattern thereon with said write gun means, the improvement comprising: using a secondary electron emissive material in said insulating layer for producing secondary electron emission from said charge pattern in response to electrons being attracted thereto from said electron flood gun means; employing a collector electrode adjacent said insulating layer for collecting secondary electrons emitted therefrom; writing a charge pattern over selected regions on the inner surface of said insulating layer with said write gun means so as to cause electrons from said flood gun means to be attracted to said charge pattern and produce secondary electron emission therefrom so as to thereby fix the surface potential of said insulating layer at said regions to the potential of said collector electrode; applying an alternating signal to the outer surface of said insulaTing layer to cause an alternating field to be developed between the fixed potential of said regions and said outer surface.
Claim 13
Independent Claim
188 words
A method of operating a cathode ray type storage and display tube device having an electron write gun means, electron flood gun means and an insulating layer at the display surface thereof for storing a charge pattern thereon with said write gun means, the improvement comprising: using a secondary electron emissive material in said insulating layer for producing secondary electron emission from said charge pattern in response to electrons being attracted thereto from said electron flood gun means; employing a collector electrode adjacent said insulating layer for collecting secondary electrons emitted therefrom; writing a charge pattern over selected regions on the inner surface of said insulating layer with said write gun means so as to cause electrons from said flood gun means to be attracted to said charge pattern and produce secondary electron emission therefrom so as to thereby fix the surface potential of said insulating layer at said regions to the potential of said collector electrode; applying an alternating signal to the outer surface of said insulaTing layer to cause an alternating field to be developed between the fixed potential of said regions and said outer surface.
Claim 14
Dependent Claim
16 words
The method as set forth in claim 10 wherein said insulating layer includes an electroluminescent material.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |