CA1145809A - Gaseous discharge device with lower operating voltages - Google Patents
Gaseous discharge device with lower operating voltagesInfo
- Publication number
- CA1145809A CA1145809A CA000118856A CA118856A CA1145809A CA 1145809 A CA1145809 A CA 1145809A CA 000118856 A CA000118856 A CA 000118856A CA 118856 A CA118856 A CA 118856A CA 1145809 A CA1145809 A CA 1145809A
- Authority
- CA
- Canada
- Prior art keywords
- dielectric material
- layer
- discharge
- dielectric
- angstrom units
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J11/00—Gas-filled discharge tubes with alternating current induction of the discharge, e.g. alternating current plasma display panels [AC-PDP]; Gas-filled discharge tubes without any main electrode inside the vessel; Gas-filled discharge tubes with at least one main electrode outside the vessel
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Gas-Filled Discharge Tubes (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
There is disclosed a multiple gaseous discharge display/
memory panel having an electrical memory and capable of produc-ing a visual display, the panel being characterized by an ionizable gaseous medium in a gas chamber formed by a pair of opposed dielectric material charge storage members which are respectively backed by a series of parallel-like conductor ( electrode) members, the conductor members behind each dielectric material member being transversely oriented with respect to the conductor members behind the opposing dielectric material member so as to define a plurality of discrete dis-charge volumes constituting a discharge unit, the charge storage surface of each dielectric material member has magnesium oxide applied thereto in an amount sufficient to provide substantially lower gaseous discharge panel operating voltages.
There is disclosed a multiple gaseous discharge display/
memory panel having an electrical memory and capable of produc-ing a visual display, the panel being characterized by an ionizable gaseous medium in a gas chamber formed by a pair of opposed dielectric material charge storage members which are respectively backed by a series of parallel-like conductor ( electrode) members, the conductor members behind each dielectric material member being transversely oriented with respect to the conductor members behind the opposing dielectric material member so as to define a plurality of discrete dis-charge volumes constituting a discharge unit, the charge storage surface of each dielectric material member has magnesium oxide applied thereto in an amount sufficient to provide substantially lower gaseous discharge panel operating voltages.
Description
THE INVENTION
This invention relates to novel multiple gas discharge display~memory panels which have an electrical memory and which are capable of producing a visual display or representation of data such as numerals, letters, television display, radar dis-plays, binary words, etc. More particularly, this invention relates to novel gas discharge display/memory panels having substantially decreased operating voltages. As used herein, voltage is defined as any voltage required for operation of the panel including firing and sustaining voltages as well as any other voltages for manipulation of the discharge.
In accordance with this invention, there is provided in a gaseous discharge display/memory device characterized by an ionizable gaseous medium in a gas chamber formed by a pair of opposed dielectric material charge storage surfaces, the improvement wherein each dielectric surface is coated with a layer of magnesium oxide, said oxide layer being applied in an amount sufficient to substantially decrease the operating voltages of the discharge device.
1~i809 Multiple gas discharge display and/or memory panels of the type with which the present invention is concerned are characteri~ed by an ionizable gaseous medium, usually a mixture of at least two gases at an appropriate gas pressure, in a thin gas chamber or space bet-~een a pair of opposed dielectric charge storage members which are backed by conductor (electrode) members, the conductor members backing each dielectric member being transversely oriented to define a plurality of discrete discharge volumes and constitu-ting a discharge unit. In some prior art panels the discharge uni-ts are additionally defined by surrounding or confining physical structure such as by cells or . apertures in perforated gla.ss plates and the like so as to be : physieally isolated relative to other units. In either case, with or ~ithout the eonfining physical struc-ture~ charges (electrons, ions) produced upon ionization of the gas of a selected d~scharge unit, when proper alternating operating poten-tials are applied to selected conduetors thereof, are eolleeted . upon the surfaces of the dielectric at specifically defined locations and constitute an electrical field opposing the . 20 electrical field which created them so as to terminate the discharge for the remaindsr of the half cycle and aid in the initiation of a discharge on a suceeeding opposite half eycle of applied voltage, such charges as are stored constituting an eleetrical memory.
Thus, the dielectrie layers prevent the passage of any conductive current from the conductor members to the gaseous medium and also serve as collecting surfaces for ionized gaseous medium charges (electrons, ions) during the alternate half cycles of the A C. operating potenti.a]s, such charges ~0 collecting first on one elemental or discrete dielectric surface area then on an opposing ~10mental or discr_t~ dielec tric . . .
~' ~.
sur~ace area on a.lterante half cycles to constitute an electricæl memory.
An example of a panel structure containing non- .
physically isolated or open discharge units is disclosed in U. S. Letters Patent 3,499,167 issued to Theodore C. Baker et al.
An example of a panel containing physically isolated units is disclosed in the article by D. L. Bitzer and H. G.
: Slottow entitled "The Plasma Display Panel - A Digitally Addressable Display With Inherent Memory", Proceeding of the Fall Joint Computer Conference, IEEE, San Francisco, California, . .~ Nov. 1966, pages 541-547.
: In the operation of the panel, a continuous volume of ionizable gas is confined between a pair of dielectric surfaces backed by conductor arrays forming matrix elements. The ; 15 cross conductor arrays may be orthogonally related (but any other configuration of conductor arrays may be used) to dsfine a . plurality of opposed pairs of charge storage areas on -the surfaces of the dielectric bounding or confining the gas. Thus, for a conductor matrix having H rows and C colurl~s the number of elemental discharge volumes will be the product H x C and the .
number of elemental or discrete areas will be twice the number Or elemental discharge volumes.
The gas is one which produces light (if visual display . is an objective) and a copious supply of charges (ions and electrons) during discharge. In an open cell Baker, et al type .. panel, the gas pressure and the electric field are sufficient to laterally confine charges generated on discharge within elemental or discrete volumes of gas be-tween opposed pairs of elemental or discrete dielectric areas within the perimeter of such areas, 3 especially in a panel containing non-isolated units. .
. _3_ .
11 1145809 `
-~ , ¦ As described in the Baker et al patent, the space ¦between the dielectric surfaces occupied by the gas is such as ¦to permit photons generated on discharge in a selected discrete ¦or elemental volume of gas to pass freely through the gas space ¦and strike surface areas of dielectric remote from the selected ¦discrete volumes, such remote, photon struck dielectric surface ¦areas thereby emitting electrons so as to condition other and ¦more remote elemen-tal volumes for discharges at a l~niform applied ¦po-tential.
¦ With respect to the memory func-tion of a given discharge ¦panel, the allowable distance or spacing between the dielectric surfaces depends, inter alia~ on the frequency of the alterna-ting ¦ current supply, the distance -typically being greater for lower I frequencies.
¦ Wh~le the prior art does disclose gaseous discharge devices having externally positionsd electro~es for initiating a ¦ gaseous discharge, sometimes called "electrodeless discharges,"
¦ such prior art devices utilize frequencies and spacings or ¦ discharge volumes and operating pressures such that although dis-
This invention relates to novel multiple gas discharge display~memory panels which have an electrical memory and which are capable of producing a visual display or representation of data such as numerals, letters, television display, radar dis-plays, binary words, etc. More particularly, this invention relates to novel gas discharge display/memory panels having substantially decreased operating voltages. As used herein, voltage is defined as any voltage required for operation of the panel including firing and sustaining voltages as well as any other voltages for manipulation of the discharge.
In accordance with this invention, there is provided in a gaseous discharge display/memory device characterized by an ionizable gaseous medium in a gas chamber formed by a pair of opposed dielectric material charge storage surfaces, the improvement wherein each dielectric surface is coated with a layer of magnesium oxide, said oxide layer being applied in an amount sufficient to substantially decrease the operating voltages of the discharge device.
1~i809 Multiple gas discharge display and/or memory panels of the type with which the present invention is concerned are characteri~ed by an ionizable gaseous medium, usually a mixture of at least two gases at an appropriate gas pressure, in a thin gas chamber or space bet-~een a pair of opposed dielectric charge storage members which are backed by conductor (electrode) members, the conductor members backing each dielectric member being transversely oriented to define a plurality of discrete discharge volumes and constitu-ting a discharge unit. In some prior art panels the discharge uni-ts are additionally defined by surrounding or confining physical structure such as by cells or . apertures in perforated gla.ss plates and the like so as to be : physieally isolated relative to other units. In either case, with or ~ithout the eonfining physical struc-ture~ charges (electrons, ions) produced upon ionization of the gas of a selected d~scharge unit, when proper alternating operating poten-tials are applied to selected conduetors thereof, are eolleeted . upon the surfaces of the dielectric at specifically defined locations and constitute an electrical field opposing the . 20 electrical field which created them so as to terminate the discharge for the remaindsr of the half cycle and aid in the initiation of a discharge on a suceeeding opposite half eycle of applied voltage, such charges as are stored constituting an eleetrical memory.
Thus, the dielectrie layers prevent the passage of any conductive current from the conductor members to the gaseous medium and also serve as collecting surfaces for ionized gaseous medium charges (electrons, ions) during the alternate half cycles of the A C. operating potenti.a]s, such charges ~0 collecting first on one elemental or discrete dielectric surface area then on an opposing ~10mental or discr_t~ dielec tric . . .
~' ~.
sur~ace area on a.lterante half cycles to constitute an electricæl memory.
An example of a panel structure containing non- .
physically isolated or open discharge units is disclosed in U. S. Letters Patent 3,499,167 issued to Theodore C. Baker et al.
An example of a panel containing physically isolated units is disclosed in the article by D. L. Bitzer and H. G.
: Slottow entitled "The Plasma Display Panel - A Digitally Addressable Display With Inherent Memory", Proceeding of the Fall Joint Computer Conference, IEEE, San Francisco, California, . .~ Nov. 1966, pages 541-547.
: In the operation of the panel, a continuous volume of ionizable gas is confined between a pair of dielectric surfaces backed by conductor arrays forming matrix elements. The ; 15 cross conductor arrays may be orthogonally related (but any other configuration of conductor arrays may be used) to dsfine a . plurality of opposed pairs of charge storage areas on -the surfaces of the dielectric bounding or confining the gas. Thus, for a conductor matrix having H rows and C colurl~s the number of elemental discharge volumes will be the product H x C and the .
number of elemental or discrete areas will be twice the number Or elemental discharge volumes.
The gas is one which produces light (if visual display . is an objective) and a copious supply of charges (ions and electrons) during discharge. In an open cell Baker, et al type .. panel, the gas pressure and the electric field are sufficient to laterally confine charges generated on discharge within elemental or discrete volumes of gas be-tween opposed pairs of elemental or discrete dielectric areas within the perimeter of such areas, 3 especially in a panel containing non-isolated units. .
. _3_ .
11 1145809 `
-~ , ¦ As described in the Baker et al patent, the space ¦between the dielectric surfaces occupied by the gas is such as ¦to permit photons generated on discharge in a selected discrete ¦or elemental volume of gas to pass freely through the gas space ¦and strike surface areas of dielectric remote from the selected ¦discrete volumes, such remote, photon struck dielectric surface ¦areas thereby emitting electrons so as to condition other and ¦more remote elemen-tal volumes for discharges at a l~niform applied ¦po-tential.
¦ With respect to the memory func-tion of a given discharge ¦panel, the allowable distance or spacing between the dielectric surfaces depends, inter alia~ on the frequency of the alterna-ting ¦ current supply, the distance -typically being greater for lower I frequencies.
¦ Wh~le the prior art does disclose gaseous discharge devices having externally positionsd electro~es for initiating a ¦ gaseous discharge, sometimes called "electrodeless discharges,"
¦ such prior art devices utilize frequencies and spacings or ¦ discharge volumes and operating pressures such that although dis-
2~ ¦ charges are initiated in the gaseous medium, such discharges are¦ ineffective or not utilized for charge generation and storage in ¦ the manner of the present inven-tion. -¦ The term "memory margin" is defined herein as l M.M. = Vf-VS
I - Vs ¦ ~rhere Vf is the magnitude of the applied voltage at ~hich a ¦ discharge is initiated in a discrete conditioned (as explained ¦ in the aforementioned Ba~er, et al patent) volume of gas defined ¦ by common areas of overlapping conductors and Vs is the magnitude ~ ¦ of the minimum applied periodic alternating voltage sufficient ¦ to sustain discharges once ini-tiated. It ~ill be understood that i809 basic electrical phenomena utilized in this invention is the generation of charges (ions and electrons) alternately storable at pairs of opposed or facing discrete points or areas on a pair of dielectric surfaces backed by conductors connected to a source of operating potential. Such stored charges result in an electrical field opposing the field produced by the applied potential that created them and hence operate to terminate ionization in the elemental gas volume between opposed or facing discrete points or areas of dielectric surface. The term "sustain a discharge" means producing a sequence of momentary discharges, one discharge for each half cycle of applied alter-nating sustaining voltage, once the elemental gas volume has been fired, to maintain alternate storing of charges at pairs of opposed discrete areas on the dielectric surfaces.
In accordance with this invention, it has been suprisingly discovered that the magnitude of the gaseous dis-eharge panel operating voltage is substantially decreased by applying a layer of magnesium oxide to the charge storage surfaee of eaeh dielectrie material in an amount suffieient to provide substantially decreased gaseous discharge panel operat-ing voltages.
In one embodiment hereof, the oxide layer is applied direetly to the surfaee of the dielectric material.
In another embodiment hereof, the oxide layer is formed in situ on the dielectric surface, e.g., by applying the magnesium metal (or a source thereof) to the dielectric surface followed by oxidation. One such in situ process comprises apply-ing a melt to the dielectric followed by oxidation of the melt during the cooling thereof so as to form the oxide layer.
,C
Another in situ process comprises applying an oxidizable source of magnesium to the surface. Typical of such oxidizable sources include minerals and/or compounds containing magnesium, especial-ly organic compounds which are readily heat decomposed or pyrolyzed.
The oxide layer (or a source thereof) is applied to the dielectric surface by any convenient means including not by way of limitation vapor deposition; vacuum deposition; chemical vapor deposition; wet spraying upon the surface a mixture of solution of the oxide suspended or dissolved in a liquid followed by evaporation of the liquid; dry spraying of the oxide upon the surface; electron beam evaporation; plasma flame and/or arc spray-ing and/or deposition; and sputtering target techniques.
The oxide is applied to (or formed in situ on) the dielectric surface as a very thin film or layer, the thickness and amount of the oxide layer being sufficient to substantially decrease the panel operating voltages. In the usual practice hereof, the oxide layer is applied to or formed on the dielectric material surface to a thickness of at least about 100 angstrom units with a range of about 100 angstrom units up to about 1 micron (10,000 angstrom uni~.
As used herein, the terms "film" or "layer" are intended to be all inclusive of other similar terms such as deposit, coating, finish, spread, covering, etc.
In the fabrication of a gaseous discharge panel, the dielectric material is typically applied to and cured on the surface of a supporting glass substrate or base to which the electrode or conductor elements have been previously applied.
The g~ass substrate may be of any suitable composition such as a soda lime glass composition. Two glass substrates containing electrodes and cured dielectric are then appropriately heat ~' i8(:)9 sealed together so as to form a panel.
In the preferred practice of this invention, the oxide layer is applied to the surface of the cured dielectric before the panel heat sealing cycle.
The practice of this invention may be especially beneficial over given periods of panel operating time and best results are typically realized after appropriate aging of the panel, the required amount of aging being a function of the oxide used. Panel aging is defined as the accumulated total operating time for the panel. ~n a panel without a dielectric oxide layer, 100 hours of panel aging is standard.
The following examples are intended to illustrate one of the best embodiments contemplated by the inventor in the practice of this invention.
EXAMPLE I
A layer of magnesium oxide was deposited to a relatively uniform thickness of about 1000 angstrom units on the respective exposed surfaces of two cured dielectric material layers, each dielectric layer having been previously applied and cured onto (electrodes containing) glass substrates.
The magnesium oxide was deposited by means of an elec-tron beam evaporation technique. The dielectric composit~on was a lead borosilicate consisting of 73.3% by weight PbO, 13.4% by weight B2O3, and 13.3% by weight SiO2. The glass substrates were of a soda lime composition containing about 73% by weight SiO2, about 13% by weight Na2O, about 10~ by weight CaO, about
I - Vs ¦ ~rhere Vf is the magnitude of the applied voltage at ~hich a ¦ discharge is initiated in a discrete conditioned (as explained ¦ in the aforementioned Ba~er, et al patent) volume of gas defined ¦ by common areas of overlapping conductors and Vs is the magnitude ~ ¦ of the minimum applied periodic alternating voltage sufficient ¦ to sustain discharges once ini-tiated. It ~ill be understood that i809 basic electrical phenomena utilized in this invention is the generation of charges (ions and electrons) alternately storable at pairs of opposed or facing discrete points or areas on a pair of dielectric surfaces backed by conductors connected to a source of operating potential. Such stored charges result in an electrical field opposing the field produced by the applied potential that created them and hence operate to terminate ionization in the elemental gas volume between opposed or facing discrete points or areas of dielectric surface. The term "sustain a discharge" means producing a sequence of momentary discharges, one discharge for each half cycle of applied alter-nating sustaining voltage, once the elemental gas volume has been fired, to maintain alternate storing of charges at pairs of opposed discrete areas on the dielectric surfaces.
In accordance with this invention, it has been suprisingly discovered that the magnitude of the gaseous dis-eharge panel operating voltage is substantially decreased by applying a layer of magnesium oxide to the charge storage surfaee of eaeh dielectrie material in an amount suffieient to provide substantially decreased gaseous discharge panel operat-ing voltages.
In one embodiment hereof, the oxide layer is applied direetly to the surfaee of the dielectric material.
In another embodiment hereof, the oxide layer is formed in situ on the dielectric surface, e.g., by applying the magnesium metal (or a source thereof) to the dielectric surface followed by oxidation. One such in situ process comprises apply-ing a melt to the dielectric followed by oxidation of the melt during the cooling thereof so as to form the oxide layer.
,C
Another in situ process comprises applying an oxidizable source of magnesium to the surface. Typical of such oxidizable sources include minerals and/or compounds containing magnesium, especial-ly organic compounds which are readily heat decomposed or pyrolyzed.
The oxide layer (or a source thereof) is applied to the dielectric surface by any convenient means including not by way of limitation vapor deposition; vacuum deposition; chemical vapor deposition; wet spraying upon the surface a mixture of solution of the oxide suspended or dissolved in a liquid followed by evaporation of the liquid; dry spraying of the oxide upon the surface; electron beam evaporation; plasma flame and/or arc spray-ing and/or deposition; and sputtering target techniques.
The oxide is applied to (or formed in situ on) the dielectric surface as a very thin film or layer, the thickness and amount of the oxide layer being sufficient to substantially decrease the panel operating voltages. In the usual practice hereof, the oxide layer is applied to or formed on the dielectric material surface to a thickness of at least about 100 angstrom units with a range of about 100 angstrom units up to about 1 micron (10,000 angstrom uni~.
As used herein, the terms "film" or "layer" are intended to be all inclusive of other similar terms such as deposit, coating, finish, spread, covering, etc.
In the fabrication of a gaseous discharge panel, the dielectric material is typically applied to and cured on the surface of a supporting glass substrate or base to which the electrode or conductor elements have been previously applied.
The g~ass substrate may be of any suitable composition such as a soda lime glass composition. Two glass substrates containing electrodes and cured dielectric are then appropriately heat ~' i8(:)9 sealed together so as to form a panel.
In the preferred practice of this invention, the oxide layer is applied to the surface of the cured dielectric before the panel heat sealing cycle.
The practice of this invention may be especially beneficial over given periods of panel operating time and best results are typically realized after appropriate aging of the panel, the required amount of aging being a function of the oxide used. Panel aging is defined as the accumulated total operating time for the panel. ~n a panel without a dielectric oxide layer, 100 hours of panel aging is standard.
The following examples are intended to illustrate one of the best embodiments contemplated by the inventor in the practice of this invention.
EXAMPLE I
A layer of magnesium oxide was deposited to a relatively uniform thickness of about 1000 angstrom units on the respective exposed surfaces of two cured dielectric material layers, each dielectric layer having been previously applied and cured onto (electrodes containing) glass substrates.
The magnesium oxide was deposited by means of an elec-tron beam evaporation technique. The dielectric composit~on was a lead borosilicate consisting of 73.3% by weight PbO, 13.4% by weight B2O3, and 13.3% by weight SiO2. The glass substrates were of a soda lime composition containing about 73% by weight SiO2, about 13% by weight Na2O, about 10~ by weight CaO, about
3% by weight MgO, about 1% by weight ~12O3, and small amounts ( %) e23, K2O, As2O3, and Cr2O3. The electrode lines or conductor arrays were of hanovia gold.
The two substrates were heat sealed together (using a standard solder glass) so as to form a gaseous discharge panel C
i809 of the open cell Baker et al kind. After an appropriate vacuum process, the panel was filled with an inert ionizable gas con-sisting of 99.9% atoms of neon and 0.1% atoms of argon at a pressure of about 600 Torr. The magnitude of the dynamic sustaining voltage for the gaseous discharge panel after aging for about 25 hours was about 120 volts. After aging of the panel for over 100 hours, the dynamic sustaining voltage dropped to about 90 volts.
The panel fabrication of Example I was repeated using no oxide layer on the dielectric. The panel required about 100 hours of aging before the dynamic OEustaining voltage leveled off at a magnitude of about 140 volts.
The foregoing example illustrates that when a layer of magnesium oxide is applied to the dielectric surface as in Example I, the operating voltage for the resulting fabricated gaseous discharge panel is substantially decreased, e.g., in comparison with Example II wherein no oxide layer is used.
C
.
The two substrates were heat sealed together (using a standard solder glass) so as to form a gaseous discharge panel C
i809 of the open cell Baker et al kind. After an appropriate vacuum process, the panel was filled with an inert ionizable gas con-sisting of 99.9% atoms of neon and 0.1% atoms of argon at a pressure of about 600 Torr. The magnitude of the dynamic sustaining voltage for the gaseous discharge panel after aging for about 25 hours was about 120 volts. After aging of the panel for over 100 hours, the dynamic sustaining voltage dropped to about 90 volts.
The panel fabrication of Example I was repeated using no oxide layer on the dielectric. The panel required about 100 hours of aging before the dynamic OEustaining voltage leveled off at a magnitude of about 140 volts.
The foregoing example illustrates that when a layer of magnesium oxide is applied to the dielectric surface as in Example I, the operating voltage for the resulting fabricated gaseous discharge panel is substantially decreased, e.g., in comparison with Example II wherein no oxide layer is used.
C
.
Claims (16)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In a gaseous discharge display/memory device charac-terized by an ionizable gaseous medium in a gas chamber formed by a pair of opposed dielectric material charge storage sur-faces, the improvement wherein each dielectric surface is coated with a layer of magnesium oxide, said oxide layer being applied in an amount sufficient to substantially decrease the operating voltages of the discharge device.
2. The device of claim 1 wherein the thickness of the oxide layer on each dielectric surface is at least about 100 Angstrom units.
3. The device of claim 2 wherein the oxide layer thick-ness on each dielectric surface ranges from about 100 Angstrom units up to about 10,000 Angstrom units.
4. In a gaseous discharge display/memory device compris-ing an ionizable gaseous medium in a gas chamber formed by a pair of opposed dielectric material charge storage surfaces backed by electrode members, the electrode members behind each dielectric material surface being transversely oriented with respect to the electrode members behind the opposing dielectric material surface so as to define a plurality of discharge units, the improvement wherein a layer of magnesium oxide is applied to each opposed dielectric material surface, each layer being applied in amounts sufficient to decrease the operating voltages of the device.
5. As an article of manufacture, a dielectric material body for a gaseous discharge device, said dielectric body con-taining a surface deposit of a layer of magnesium oxide, said oxide layer being deposited in an amount sufficient to decrease the operating voltages of a gaseous discharge device.
6. The device of claims 4 or 5 wherein the thickness of the oxide layer is at least about 100 Angstrom units.
7. The device of claims 4 or 5, wherein the thickness of the oxide layer ranges from about 100 Angstrom units to about 10,000 Angstrom units.
8. In a gaseous discharge display/memory device charac-terized by an ionizable gaseous medium in a gas chamber formed by a pair of opposed dielectric material charge storage sur-faces, the improvement wherein each dielectric surface is coated with a layer of magnesium oxide, said layer having a thickness in the range of from about 100 Angstrom units up to about 10,000 Angstrom units to substantially decrease the operating voltages of the device.
9. In a gaseous discharge diaplay/memory device compris-ing an ionizable gaseous medium in a gas chamber formed by a pair of opposed dielectric material charge storage surfaces backed by electrode members, the electrode members behind each dielectric material surface being transversely oriented with respect to the electrode members behind the opposing dielectric material surface so as to define a plurality of discharge units, the improvement wherein a layer of magnesium oxide is applied to each opposed dielectric material surface, each layer having a thickness in the range of from about 100 Angstrom units up to about 10,000 Angstrom units to decrease the operating voltages of the device.
10. A gaseous discharge display/memory device comprising an ionizable gaseous medium in a gas chamber formed by a pair of dielectric material members having opposed gaseous medium contacting surfaces, which dielectric material members are res-pectively backed by a series of parallel-like electrode members, the electrode members behind each dielectric material member being transversely oriented with respect to the electrode members behind the opposing dielectric material members so as to define a plurality of discrete discharge volumes, each con-stituting a discharge unit, and wherein the gas is selectively ionized within each discharge unit by operating voltages applied to the transversely oriented electrode members, the improvement which comprises substantially decreasing the operating voltages of the device by coating the gaseous medium contacting surface of each opposed dielectric material with a layer of magnesium oxide in an amount sufficient to substantially decrease the operating voltage of the device.
11. The device of claim 10 wherein the thickness of the magnesium oxide layer on the surface of each dielectric material member is at least about 100 Angstrom units.
12. The device of claim 10 wherein the thickness of the magnesium oxide layer on the surface of each dielectric material member ranges from about 100 Angstrom units to about 10,000 Angstrom units.
13. The device as defined in claim 4, in which the said dielectric material is a lead oxide glass.
14. The device as defined in claim 4, in which the said dielectric material is a lead-borosilicate glass having a high lead oxide content.
15. The device as defined in claim 4, wherein the magnesium oxide layer has a thickness of about 2000 Angstroms.
16. In a gaseous discharge device, the combination comprising:
a sealed chamber filled with an ionizable gas, conductor arrays formed on the inner surfaces of said ionizable chamber, each of said conductor arrays comprising a plurality of parallel conductors, said conductor arrays being orthogonally related to define discrete gas discharge cells at respective intersections thereof, said gas discharge cells being adapted to provide discrete localized discharges when appropriately energized by control signals applied thereto, a dielectric member formed over each of said conductor arrays, and a homogeneous layer of an alkaline earth metal oxide having a high secondary emission characteristic deposited on the surface of said dielectric member and in contact with said ionizable gas to enable operation of said gaseous discharge device with lower amplitude control signals.
a sealed chamber filled with an ionizable gas, conductor arrays formed on the inner surfaces of said ionizable chamber, each of said conductor arrays comprising a plurality of parallel conductors, said conductor arrays being orthogonally related to define discrete gas discharge cells at respective intersections thereof, said gas discharge cells being adapted to provide discrete localized discharges when appropriately energized by control signals applied thereto, a dielectric member formed over each of said conductor arrays, and a homogeneous layer of an alkaline earth metal oxide having a high secondary emission characteristic deposited on the surface of said dielectric member and in contact with said ionizable gas to enable operation of said gaseous discharge device with lower amplitude control signals.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US7622970A | 1970-09-28 | 1970-09-28 | |
| US76,229 | 1970-09-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1145809A true CA1145809A (en) | 1983-05-03 |
Family
ID=22130720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000118856A Expired CA1145809A (en) | 1970-09-28 | 1971-07-22 | Gaseous discharge device with lower operating voltages |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS6042579B1 (en) |
| CA (1) | CA1145809A (en) |
| DE (1) | DE2136102C3 (en) |
| FR (1) | FR2112211B1 (en) |
| GB (1) | GB1374585A (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT961553B (en) * | 1971-08-31 | 1973-12-10 | Ibm | PERFECTED GASEOUS DISCHARGE DEVICE |
| JPS4842675A (en) * | 1971-09-29 | 1973-06-21 | ||
| JPS5713983B2 (en) * | 1973-03-02 | 1982-03-20 | ||
| JPS49129477A (en) * | 1973-04-11 | 1974-12-11 | ||
| JPS5238881A (en) * | 1975-09-22 | 1977-03-25 | Okaya Denki Sangyo Kk | Discharge display device |
| JPS5263663A (en) * | 1975-11-19 | 1977-05-26 | Fujitsu Ltd | Gas electric discharge panel |
| US4053804A (en) * | 1975-11-28 | 1977-10-11 | International Business Machines Corporation | Dielectric for gas discharge panel |
| JPS5217763A (en) * | 1976-07-12 | 1977-02-09 | Nec Corp | External electrode discharging device |
| DE3106368A1 (en) * | 1980-02-22 | 1982-01-07 | Okaya Electric Industries Co, Ltd., Tokyo | PLASMA DISPLAY |
| JPS57180046A (en) * | 1981-04-28 | 1982-11-05 | Okaya Denki Sangyo Kk | Panel for displaying dc gas discharge |
| JPS6099765U (en) * | 1984-10-11 | 1985-07-08 | 富士通株式会社 | gas discharge panel |
| JPH11180726A (en) * | 1997-03-28 | 1999-07-06 | Asahi Glass Co Ltd | Substrate for plasma display panel and low melting point glass composition |
| DE19734650B4 (en) * | 1997-08-07 | 2007-06-21 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Device for emission of electromagnetic radiation by gas discharge, method for its production and use of the device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS492425A (en) * | 1972-04-19 | 1974-01-10 |
-
1971
- 1971-07-20 DE DE2136102A patent/DE2136102C3/en not_active Expired
- 1971-07-22 CA CA000118856A patent/CA1145809A/en not_active Expired
- 1971-09-24 GB GB4460971A patent/GB1374585A/en not_active Expired
- 1971-09-27 FR FR717134693A patent/FR2112211B1/fr not_active Expired
- 1971-09-28 JP JP46075149A patent/JPS6042579B1/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6042579B1 (en) | 1985-09-24 |
| DE2136102A1 (en) | 1972-09-07 |
| FR2112211A1 (en) | 1972-06-16 |
| DE2136102B2 (en) | 1977-07-14 |
| GB1374585A (en) | 1974-11-20 |
| DE2136102C3 (en) | 1978-03-09 |
| JPS477275A (en) | 1972-04-20 |
| FR2112211B1 (en) | 1973-06-29 |
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