CA1053737A - Display panel with matrix of cathode pairs - Google Patents
Display panel with matrix of cathode pairsInfo
- Publication number
- CA1053737A CA1053737A CA245,072A CA245072A CA1053737A CA 1053737 A CA1053737 A CA 1053737A CA 245072 A CA245072 A CA 245072A CA 1053737 A CA1053737 A CA 1053737A
- Authority
- CA
- Canada
- Prior art keywords
- display
- priming
- cathode
- areas
- cathodes
- 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
- H01J17/00—Gas-filled discharge tubes with solid cathode
- H01J17/38—Cold-cathode tubes
- H01J17/48—Cold-cathode tubes with more than one cathode or anode, e.g. sequence-discharge tube, counting tube, dekatron
- H01J17/49—Display panels, e.g. with crossed electrodes, e.g. making use of direct current
- H01J17/492—Display panels, e.g. with crossed electrodes, e.g. making use of direct current with crossed electrodes
- H01J17/494—Display panels, e.g. with crossed electrodes, e.g. making use of direct current with crossed electrodes using sequential transfer of the discharges, e.g. of the self-scan type
Landscapes
- Gas-Filled Discharge Tubes (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
The panel comprises a base plate which carries a plurality of conductive strips which are oriented parallel to each other and are suitably insulated so that each such strip is divided into a plurality of pairs of electrodes, each pair including a first electrode, operable as a scanning or priming cathode, and a second electrode operable as a display cathode. The orientation of the strips and the subdivisions is such that the pairs of electrodes are arrayed in rows and columns, and correspondingly, the first electrodes and the second electrodes themselves are separately disposed in rows and columns. Because the scan and display cathodes are formed from a common strip electrode, the columns of display cathodes are electrically connected and the columns of scan cathodes are electrically connected. Insulating means are provided which compartmentalize the rows of first scan cathodes and the second display cathodes so that a separate slot or channel is provided for each row of display cathodes and each row of scan cathodes. A separate display anode is provided in operative relation with each row of display cathodes and with each row of scan cathodes. In operation of the panel, each column of scan cathodes is energized in turn by connecting all of the scan anodes in an operating circuit and energizing each column of scan cathodes separately and sequentially. As each column of scan cathodes is energized, information signals are applied to selected display anodes, and this causes cathode glow to transfer to the display cathodes associated with the selected display anodes from the associated scan cathodes which are paired with such display cathodes. As each column of electrode pairs is thus energized in turn and all of the columns are energized sequentially, and selected display cathodes are energized, a changeable but visually stationary message is displayed by the energized display cathodes.
Description
1053737 ~ ~
Background of the Invention The principles of the invention relate to display panels of the ~ype known as SELF-SCAN*panels which are manu- .
factured and sold by Burroughs Corporation. These panels are dot matrix devices which display characters by energizing and 8enerating light in selected cells in a ma~rix of cells, usually a 5 x 7 matrix, with the total number of energized r cells displayin~ a character. SELF-SCAN*panels include -separate arrsys of scanning cells and display cells which are electrically connected to form a plurality of such 5 x 7 or ~ -other matrices, with the scanning cells being adapted to assist in the energization of selected display cells in accordance with input signal information. One form of SELF-SCAN*panel is shown .
and described in our U.S. Patent No. 3,821,586 (June 28~ 1974). Panels of this type have achieved commercia1 success; however, there is a constant need for simplification in the component parts and structure of such devices for mass production manufacture.
*Tradema~k -2-It is an object of the present invention'to provide a display panel whereln, at least in a described embodiment, such simplification is provided.
--................... According to the present invention, there is provided a display panel comprising a gas-filled enve].ope including a base plate and a face plate having a viewing window; a plurality of columns of coplanar operating cathode areas which are electrically connected in each such column, all of said cathode operating areas having upper surfaces facing said viewing window; said columns of cathode ~ areas including display cathode areas and priming cathode areas, said priming cathode areas providing excited particles for said display cathode areas through gas communication paths extending along said columns of cathode areas; said display areas and said priming areas also being disposed in rows; barrier means between said base plate and face plate.and having portions which delineate said rows of display areas and said rows of priming areas, and a priming anode overlying each row of priming cathode areas and a display anode -overlying each row of display cathode areas, said barrier means also effectively separating adjacent anodes from each other.
. Embodiments of the invention will now be described with reference to the accGmpanying drawings in which:- .
Fig. l is an exploded plan view of the parts of a display panel;
Fig. 2 is an enlarged view of a portion of the panel of l~ig. 1;
Fig. 3 is a sectional v~ew of a portion of the panel of Fig. 1 assembled;
Fig. 4 is a sectional view along the lines 4-4 in Fig. l showing the panel assembled;
I0 Fig~ 5 is a sectlonal view along the lines 5-5 in Fig. 1 showing the panel assembled;
Fig. 6 is a schematic representation of the panel o~
Fig. l and a clrcuit in which it can be operated;
Fig. 7 is a plan view of a modification of a portion 15 of the panel of Fig. l;
Fig. 8 is a perspectire view, partly in section, of a panel modification;
Fig. 9 is an exploded perspective view of the panel of Fig. 8;
20 Fig. 10 is an exploded plan view of the panel of Fig. 8;
Fig. 11 is on the same sheet as-Fi~. 9 and is a sectional view of the panel of Fig. 8; and Fig. 12 is an enlarged view of a portion of the panel 25 of Fig. 8 shown to illustrate current flow therein.
~ .
~ 053737 Description Or the Preferred ~mbot!ime.nts ~ display panel lO,-referring ~o Figs..lj 2 and 3, includes a ba.se plate ? of insulatillg material . .~ j such as glass, ceramic, or the like, and having a top surface 30 '~
on which are provided a plurality of rectangular strips 40 of conductive material arrayed parallel to each other. The conduc-tive strips or electrodes 40 are formed preferably by a screen printing process using any suitable material such as a mixtnre of nicl~el and glass frit in a suita~le binder.
An auxiliary conductive strip 41, used as a reset.
cathode in a scanning operation to be described, is disposrd if adjacent to the first strip 40 at the left-hand end of panel 10. -This is arbitrarily considered to be the end at which the scan-ning cycle will begin. In addition, at least one keep-alive cell is provided near the reset cathode and comprising two electrodes, a cathode 43 and an anode 45, both of t,-fhich are preferably formed on the base plate.
The conductive strips 40 are subdivided into rows of rectangular areas 42 by means of thin parallel longitudinal lines 60 of insulating material formed on the top surface of the plate and on the strips 40. The lines 60 extend along the t length of the base plate. In addition, each of the rectangular areas 42 of the strips 40 is subdivided by means of insulating . strips 62 formed on each rectangular area to subdivide each such portion into a first, relatively large-area portion 44, to be operated as a display cathode, and a second generally rectangular but smaller portion 46, to be operated as a scanning or priming cathode. The display cathode portion 44 is connected to the scanning cathode portion 46 by a narrow portion 48 which lies between the insulating portions 62. If ~ .
f ~ .
lQ53737 a 5 x 7 dot matrix is to be used to form characters in panel 10, then five subdivisions 42 are provided in each strip 40.
The insulating strips 60 and 62 may be formed by a screen printing process.
It is noted that each portion 42 of a strip 40, refer-ring to Fig. 2, thus comprises an electrode pair including electrode 44 and electrode 46, and the electrode pairs and their component electrodes are all arrayed in rows and columns.
The panel 10 includes an insulating plate 70 seated on the base plate 20 and resting on the insulating lines 60 and portions 62 which have a thickness or height of about 2 mils so that they can support the insulating plate 70 above the conductive strips 40. With plate 70 resting on insulating portions 62, gas communication paths are provided between each display cathode 44 and its associated scan cathode 46 through a path 74 extending along the narrow, constricted space 48 between strips 62, as shown in Figs. 2 and 3.
The insulating plate 70 includes a plurality of horizontal slots 76 and 78, each slot 76 overlaying a row of display cathodes 44, and each slot 78 overlaying a row of scan cathodes 46. The lands or ribs 79 between each slot 76 and the adjacent slot 78 overlay insulating portions 62 or insulating lines 60.
The panel 10 also includes a transparent face plate 80 of glass or the like, hermetically sealed to the center plate and the base plate by a seal 95, and carrying on its inner surface 82 a plurality of transparent conductive anode electrodes 90 of tin oxide or the like, each anode overlaying a slot 76 in the center plate and a row of display cathodes.
~53737 .... ~. .
The face plate also carries on its inner surface a plurality of opaque scan anodes 94, each overlaying a slot 7~ ànd row of scan cathodes.
The panel 10 is filled with a suitable ionizable gas such as neon, xenon, or the like, singly or in combination, at a suitable pressure. The gas atmosphere also includes mercury vapor to minimize cathode sputtering.
In panel lO, various parameters are selected to insure that one column of cathodes glows at a time even though io they are connected in groups. These parameters include the spacing of the columns of cathodes from each other, which, in one panel, was about six mils; the spacing of the face plate from the base plate, which was about 25 mils, and the pressure of the gas filling, which in such one panel was about 400 Torr.
Those skilled in the art will be readily able to modify these parameters to achieve the desired operation of modifications of panel lO.
In one mode of operation of panel lO, the strips 40 are electrically connected in groups by means of leads 50A, 50B, 50C, with every fourth electrode being in the same group so that there are three such groups of electrodes. The inter connections 50 can be formed on base plate 20 at the same time as the strips-are formed, or they may be provided in any other suitable manner. It will be clear to those skilled in the art, from the following description of the invention and from information already known about SEL~-SCA~*panels, that other electrode groupings can be used or even that each electrode can be separately connected to an external circuit. However, the electrode groupings provide economies in circuit operation~
.
*Trademark _7_ ~ ~ ~ r A system for operating panel 10 is shown in Fig. 6.
In the system, the keep-alive electrodes 43 and 45 are connected to a source of potential V, by means of which the keep-alive cell is maintained continually energized and generating excited particles. The reset cathode 41 is connected to a reset driver 96, and the groups of cathodes 40 are connected by their conductors 50 to separate cathode drivers 100 for connecting each cathode group in an operating circuit. All of the scan anodes 94 are connected together through a suitable resistive path, if required, to a source of generally positive operating potential 110. Each of the display anodes 90 is connected through a separate, suitably resistlve path to a source~of information signals which themselves are connected to a data source 120 which may include a computer, encoders, decoders, character generator, and the like circuit modules. Suitable synchronizing control circuits 130 are provided for interrelating the various circuit elements to operate as described below.
With the keep-alive cell ON, and all of the scan anodes 94 energized, a pulse or other signal is applied by source 50R to the reset cathode 40R which turns on, exhibits cathode glow, and generates excited particles.
The excited particles thus generated are present near the first column of scan cathodes 46, and, when the first cathode driver 50A is operated to connect the first column of scan cathodes in circuit with the scan anodes, these scan cathodes turn on, exhibit cathode glow, and generate excited particles. Although other columns of scan cathodes in the same group are energized at the same time, they do not glow.
This is because the first co~umn of scan cathodes 46 turns on ,,~
pref~rentia~ly beeause it is close to the reset catllode lOOR
and to the excited partic]es generated tllereby. These particles do not diffuse to the other columns of scan cathodes in the group. In addition, when the first column of scan cathodes turns onJ it quickly assumes sustaining potential which is lower than the required firing potential for the other columns of scan cathodes in its group.
As each of the cathode drivers 100 is operated in turn, each of the columns of scan cathodes is energized and exhibits cathode glow, in turn, with each column providing excited particles for the ne~t adjacent column. The scan cathode glow is not visible to a viewer since-the scan anodes 94 are o~a~ue.
As each of the columns of scan cathodes is energized and the scan cathodes glow, information signals applied to selected display anodes 90 cause cathode glow to transfer from the scan cathode beneath and adjacent to the selected display anodes through the constricted path 48 to the adjacent display cathode, beneath the selected display anode. The display csthode now glows, and this glow is visible to a viewer through the transparent display anodes. This operation is repeated for each column of electrode pairs, and the total scanning operation is repeated cyclically throughout the panel - at such a rate that the display cathodes which are energized present an apparently stationary but changeable message. This mode of operation described above is generally similar to that employed in SELF-SC~N*panels of the type described in the above mentioned patent.
The panel 10 may also use modified cathode strips 40 (~ig. 7) in which the rectangular areas 42 are subdivided by _g_ *Trademark 10~;~737 rectangular insulating strips 62' formed on each such subdivided portion 42 and positioned close to strips 60 to form a relatively large-area display cathode portion 44' and a relatively small-area scan cathode portion 46'. The strips 62' are spaced from the left and right edges of the cathode strips 40 to provide a narrow constricted path 48' on each side of the strip. In operation of a panel with cathode strips of the type shown in Fig. 7, glow transfer takes place from a scan cathode 46' to a display cathode 44' through the two gas communication paths 48'.
A panel 200 embodying a modification of the invention and sho~n in Figs. 8-12 includes a base plate 210 of glass or other suitable insulating material having a top surface 220 on which is formed a plurality of parallel conductive strips 230 disposed generally transverse to the longitudinal axis of the base plate. The conductive strips 230 are operated as cathode electrodes in the completed panel, and they may be formed by a screen printing process as above. If desired, the conductive strips may also comprise individual metallic elements suitably secured to the base plate.
A slotted insulating plate 240 is seated on the cathodes 230 to divide them into generally rectangular elemental areas 230D and 230S. The slots ~44 and 246 in the plate are alternately wide and narrow so that the cathodes 230 are divided into alternately large and small areas which, as can be seen, are arrayed in rows and columns. In operation of the panel, the relatively small cathode areas 230S are operated as scanning or priming cathodes, and the relatively large areas 230D are operated as display cathodes.
()S3737 , The panel is completed by a glass face plate 250 which carries, on its inner surface 260, a plurality of alternate wide and narrow anode strips 270D and 270S, respectively, insulated from each other and disposed parallel to the longitudinal axis of the face plate and the panel.
The relatively wide anode strips 270D may be made of material such as tin oxide, and each of these overlays a row of display cathodes 230D. Adjacent to each transparent anode is an opaque anode film or strip 270S of any suitable material, each of which overlays a row of scanning or priming cathodes 230S.
Thus, when display cathodes are energized and exhibit cathode glo~7, the glow is visible through their anodes 270D, and when scanning cathodes are energized and exhibit cathode glow, the glow is not visible through their anodes 270S.
Although they are not shown, panel 200 would include a reset cathode and a suitable keep-alive arrangement as required and as described above.
The operation of panel 200 is essentially the same as the operation of the other panels described above except that, as columns of scanning cells are energized by the application of operating potential to the cathode strips and the scan anodes, and information signals are applied to the display anodes, it is believed that glow is transferred from a scan cathode to the selected adjacent display cathode along the left and right hand edges of the cathode strip through the space between insulating plate 240 and the top surface of base plate 210 as illustrated by the dash lines in Fig. 12.
Background of the Invention The principles of the invention relate to display panels of the ~ype known as SELF-SCAN*panels which are manu- .
factured and sold by Burroughs Corporation. These panels are dot matrix devices which display characters by energizing and 8enerating light in selected cells in a ma~rix of cells, usually a 5 x 7 matrix, with the total number of energized r cells displayin~ a character. SELF-SCAN*panels include -separate arrsys of scanning cells and display cells which are electrically connected to form a plurality of such 5 x 7 or ~ -other matrices, with the scanning cells being adapted to assist in the energization of selected display cells in accordance with input signal information. One form of SELF-SCAN*panel is shown .
and described in our U.S. Patent No. 3,821,586 (June 28~ 1974). Panels of this type have achieved commercia1 success; however, there is a constant need for simplification in the component parts and structure of such devices for mass production manufacture.
*Tradema~k -2-It is an object of the present invention'to provide a display panel whereln, at least in a described embodiment, such simplification is provided.
--................... According to the present invention, there is provided a display panel comprising a gas-filled enve].ope including a base plate and a face plate having a viewing window; a plurality of columns of coplanar operating cathode areas which are electrically connected in each such column, all of said cathode operating areas having upper surfaces facing said viewing window; said columns of cathode ~ areas including display cathode areas and priming cathode areas, said priming cathode areas providing excited particles for said display cathode areas through gas communication paths extending along said columns of cathode areas; said display areas and said priming areas also being disposed in rows; barrier means between said base plate and face plate.and having portions which delineate said rows of display areas and said rows of priming areas, and a priming anode overlying each row of priming cathode areas and a display anode -overlying each row of display cathode areas, said barrier means also effectively separating adjacent anodes from each other.
. Embodiments of the invention will now be described with reference to the accGmpanying drawings in which:- .
Fig. l is an exploded plan view of the parts of a display panel;
Fig. 2 is an enlarged view of a portion of the panel of l~ig. 1;
Fig. 3 is a sectional v~ew of a portion of the panel of Fig. 1 assembled;
Fig. 4 is a sectional view along the lines 4-4 in Fig. l showing the panel assembled;
I0 Fig~ 5 is a sectlonal view along the lines 5-5 in Fig. 1 showing the panel assembled;
Fig. 6 is a schematic representation of the panel o~
Fig. l and a clrcuit in which it can be operated;
Fig. 7 is a plan view of a modification of a portion 15 of the panel of Fig. l;
Fig. 8 is a perspectire view, partly in section, of a panel modification;
Fig. 9 is an exploded perspective view of the panel of Fig. 8;
20 Fig. 10 is an exploded plan view of the panel of Fig. 8;
Fig. 11 is on the same sheet as-Fi~. 9 and is a sectional view of the panel of Fig. 8; and Fig. 12 is an enlarged view of a portion of the panel 25 of Fig. 8 shown to illustrate current flow therein.
~ .
~ 053737 Description Or the Preferred ~mbot!ime.nts ~ display panel lO,-referring ~o Figs..lj 2 and 3, includes a ba.se plate ? of insulatillg material . .~ j such as glass, ceramic, or the like, and having a top surface 30 '~
on which are provided a plurality of rectangular strips 40 of conductive material arrayed parallel to each other. The conduc-tive strips or electrodes 40 are formed preferably by a screen printing process using any suitable material such as a mixtnre of nicl~el and glass frit in a suita~le binder.
An auxiliary conductive strip 41, used as a reset.
cathode in a scanning operation to be described, is disposrd if adjacent to the first strip 40 at the left-hand end of panel 10. -This is arbitrarily considered to be the end at which the scan-ning cycle will begin. In addition, at least one keep-alive cell is provided near the reset cathode and comprising two electrodes, a cathode 43 and an anode 45, both of t,-fhich are preferably formed on the base plate.
The conductive strips 40 are subdivided into rows of rectangular areas 42 by means of thin parallel longitudinal lines 60 of insulating material formed on the top surface of the plate and on the strips 40. The lines 60 extend along the t length of the base plate. In addition, each of the rectangular areas 42 of the strips 40 is subdivided by means of insulating . strips 62 formed on each rectangular area to subdivide each such portion into a first, relatively large-area portion 44, to be operated as a display cathode, and a second generally rectangular but smaller portion 46, to be operated as a scanning or priming cathode. The display cathode portion 44 is connected to the scanning cathode portion 46 by a narrow portion 48 which lies between the insulating portions 62. If ~ .
f ~ .
lQ53737 a 5 x 7 dot matrix is to be used to form characters in panel 10, then five subdivisions 42 are provided in each strip 40.
The insulating strips 60 and 62 may be formed by a screen printing process.
It is noted that each portion 42 of a strip 40, refer-ring to Fig. 2, thus comprises an electrode pair including electrode 44 and electrode 46, and the electrode pairs and their component electrodes are all arrayed in rows and columns.
The panel 10 includes an insulating plate 70 seated on the base plate 20 and resting on the insulating lines 60 and portions 62 which have a thickness or height of about 2 mils so that they can support the insulating plate 70 above the conductive strips 40. With plate 70 resting on insulating portions 62, gas communication paths are provided between each display cathode 44 and its associated scan cathode 46 through a path 74 extending along the narrow, constricted space 48 between strips 62, as shown in Figs. 2 and 3.
The insulating plate 70 includes a plurality of horizontal slots 76 and 78, each slot 76 overlaying a row of display cathodes 44, and each slot 78 overlaying a row of scan cathodes 46. The lands or ribs 79 between each slot 76 and the adjacent slot 78 overlay insulating portions 62 or insulating lines 60.
The panel 10 also includes a transparent face plate 80 of glass or the like, hermetically sealed to the center plate and the base plate by a seal 95, and carrying on its inner surface 82 a plurality of transparent conductive anode electrodes 90 of tin oxide or the like, each anode overlaying a slot 76 in the center plate and a row of display cathodes.
~53737 .... ~. .
The face plate also carries on its inner surface a plurality of opaque scan anodes 94, each overlaying a slot 7~ ànd row of scan cathodes.
The panel 10 is filled with a suitable ionizable gas such as neon, xenon, or the like, singly or in combination, at a suitable pressure. The gas atmosphere also includes mercury vapor to minimize cathode sputtering.
In panel lO, various parameters are selected to insure that one column of cathodes glows at a time even though io they are connected in groups. These parameters include the spacing of the columns of cathodes from each other, which, in one panel, was about six mils; the spacing of the face plate from the base plate, which was about 25 mils, and the pressure of the gas filling, which in such one panel was about 400 Torr.
Those skilled in the art will be readily able to modify these parameters to achieve the desired operation of modifications of panel lO.
In one mode of operation of panel lO, the strips 40 are electrically connected in groups by means of leads 50A, 50B, 50C, with every fourth electrode being in the same group so that there are three such groups of electrodes. The inter connections 50 can be formed on base plate 20 at the same time as the strips-are formed, or they may be provided in any other suitable manner. It will be clear to those skilled in the art, from the following description of the invention and from information already known about SEL~-SCA~*panels, that other electrode groupings can be used or even that each electrode can be separately connected to an external circuit. However, the electrode groupings provide economies in circuit operation~
.
*Trademark _7_ ~ ~ ~ r A system for operating panel 10 is shown in Fig. 6.
In the system, the keep-alive electrodes 43 and 45 are connected to a source of potential V, by means of which the keep-alive cell is maintained continually energized and generating excited particles. The reset cathode 41 is connected to a reset driver 96, and the groups of cathodes 40 are connected by their conductors 50 to separate cathode drivers 100 for connecting each cathode group in an operating circuit. All of the scan anodes 94 are connected together through a suitable resistive path, if required, to a source of generally positive operating potential 110. Each of the display anodes 90 is connected through a separate, suitably resistlve path to a source~of information signals which themselves are connected to a data source 120 which may include a computer, encoders, decoders, character generator, and the like circuit modules. Suitable synchronizing control circuits 130 are provided for interrelating the various circuit elements to operate as described below.
With the keep-alive cell ON, and all of the scan anodes 94 energized, a pulse or other signal is applied by source 50R to the reset cathode 40R which turns on, exhibits cathode glow, and generates excited particles.
The excited particles thus generated are present near the first column of scan cathodes 46, and, when the first cathode driver 50A is operated to connect the first column of scan cathodes in circuit with the scan anodes, these scan cathodes turn on, exhibit cathode glow, and generate excited particles. Although other columns of scan cathodes in the same group are energized at the same time, they do not glow.
This is because the first co~umn of scan cathodes 46 turns on ,,~
pref~rentia~ly beeause it is close to the reset catllode lOOR
and to the excited partic]es generated tllereby. These particles do not diffuse to the other columns of scan cathodes in the group. In addition, when the first column of scan cathodes turns onJ it quickly assumes sustaining potential which is lower than the required firing potential for the other columns of scan cathodes in its group.
As each of the cathode drivers 100 is operated in turn, each of the columns of scan cathodes is energized and exhibits cathode glow, in turn, with each column providing excited particles for the ne~t adjacent column. The scan cathode glow is not visible to a viewer since-the scan anodes 94 are o~a~ue.
As each of the columns of scan cathodes is energized and the scan cathodes glow, information signals applied to selected display anodes 90 cause cathode glow to transfer from the scan cathode beneath and adjacent to the selected display anodes through the constricted path 48 to the adjacent display cathode, beneath the selected display anode. The display csthode now glows, and this glow is visible to a viewer through the transparent display anodes. This operation is repeated for each column of electrode pairs, and the total scanning operation is repeated cyclically throughout the panel - at such a rate that the display cathodes which are energized present an apparently stationary but changeable message. This mode of operation described above is generally similar to that employed in SELF-SC~N*panels of the type described in the above mentioned patent.
The panel 10 may also use modified cathode strips 40 (~ig. 7) in which the rectangular areas 42 are subdivided by _g_ *Trademark 10~;~737 rectangular insulating strips 62' formed on each such subdivided portion 42 and positioned close to strips 60 to form a relatively large-area display cathode portion 44' and a relatively small-area scan cathode portion 46'. The strips 62' are spaced from the left and right edges of the cathode strips 40 to provide a narrow constricted path 48' on each side of the strip. In operation of a panel with cathode strips of the type shown in Fig. 7, glow transfer takes place from a scan cathode 46' to a display cathode 44' through the two gas communication paths 48'.
A panel 200 embodying a modification of the invention and sho~n in Figs. 8-12 includes a base plate 210 of glass or other suitable insulating material having a top surface 220 on which is formed a plurality of parallel conductive strips 230 disposed generally transverse to the longitudinal axis of the base plate. The conductive strips 230 are operated as cathode electrodes in the completed panel, and they may be formed by a screen printing process as above. If desired, the conductive strips may also comprise individual metallic elements suitably secured to the base plate.
A slotted insulating plate 240 is seated on the cathodes 230 to divide them into generally rectangular elemental areas 230D and 230S. The slots ~44 and 246 in the plate are alternately wide and narrow so that the cathodes 230 are divided into alternately large and small areas which, as can be seen, are arrayed in rows and columns. In operation of the panel, the relatively small cathode areas 230S are operated as scanning or priming cathodes, and the relatively large areas 230D are operated as display cathodes.
()S3737 , The panel is completed by a glass face plate 250 which carries, on its inner surface 260, a plurality of alternate wide and narrow anode strips 270D and 270S, respectively, insulated from each other and disposed parallel to the longitudinal axis of the face plate and the panel.
The relatively wide anode strips 270D may be made of material such as tin oxide, and each of these overlays a row of display cathodes 230D. Adjacent to each transparent anode is an opaque anode film or strip 270S of any suitable material, each of which overlays a row of scanning or priming cathodes 230S.
Thus, when display cathodes are energized and exhibit cathode glo~7, the glow is visible through their anodes 270D, and when scanning cathodes are energized and exhibit cathode glow, the glow is not visible through their anodes 270S.
Although they are not shown, panel 200 would include a reset cathode and a suitable keep-alive arrangement as required and as described above.
The operation of panel 200 is essentially the same as the operation of the other panels described above except that, as columns of scanning cells are energized by the application of operating potential to the cathode strips and the scan anodes, and information signals are applied to the display anodes, it is believed that glow is transferred from a scan cathode to the selected adjacent display cathode along the left and right hand edges of the cathode strip through the space between insulating plate 240 and the top surface of base plate 210 as illustrated by the dash lines in Fig. 12.
Claims (11)
1. A display panel comprising a gas-filled envelope including a base plate and a face plate having a viewing window, a plurality of columns of coplanar operating cathode areas which are electrically connected in each such column, all of said cathode operating areas having upper surfaces facing said viewing window, said columns of cathode areas including display cathode areas and priming cathode areas, said priming cathode areas providing excited particles for said display cathode areas through gas communication paths extending along said columns of cathode areas, said display areas and said priming areas also being disposed in rows, barrier means between said base plate and face plate and having portions which delineate said rows of display areas and said rows of priming areas, and a priming anode overlying each row of priming cathode areas and a display anode overlying each row of display cathode areas, said barrier means also effectively separating adjacent anodes from each other.
2. The panel defined in claim 1 wherein said priming cathode areas are hidden from view by said priming anodes.
3. The panel defined in claim 1 wherein said barrier means comprises an assembly of a plurality of thin parallel insulating plates positioned between said base plate and said face plate, with said rows of cathode areas being disposed between adjacent plates.
4. The panel defined in claim 1 wherein said barrier means comprises a slotted plane having a plurality of parallel slots formed therein and extending along the long axis of said plate, said slotted plate being seated on said cathodes with the slots therein extending transversely of said cathodes and crossing all of said cathodes, there being a separate slot overlying each row of said discrete areas of said cathodes.
5. A display panel as in claim 1 wherein said display cathode areas and said display anodes define display cells, and said priming cathode areas and said priming anodes define priming cells and including means coupled to said display cathode areas and said display anodes for applying each of a succession of groups of information signals to said display anodes and said columns of display cathode areas, and means coupled to said priming cathode areas and said priming anodes for producing a glow discharge in each column of priming cathode areas, and then in the remaining columns of priming cathode areas, one after the next, to scan said columns of priming cathode areas, one at a time, in synchronism with the application of said successive groups of information signals, to produce glow discharges in selective display cells adjacent the priming cathode areas being scanned, one after the next, to provide an overall glow discharge pattern directly in the display cells.
6. The panel defined in claim 1 wherein each column of cathodes includes a series of display cathode areas and priming cathode areas which alternate with each other.
7. The panel defined in claim 6 and including barrier mean disposed between a display cathode area and the adjacent priming cathode area, said barrier means being shaped to provide a particle communication path between a priming cathode area and the adjacent display cathode area.
8. The panel defined in claim 1 wherein each priming cathode and its associated priming anode comprise a glow priming cell, there thus being columns of glow priming cells, and each display cathode and its display anode comprise a display cell, there thus being columns of display cells, means for producing a priming glow discharge in all of the glow priming cells of a column of such glow priming cells, and then in all of the cells of the remaining glow priming cell columns, one column after the next, to scan the glow priming cells, and means for applying each of a succession of groups of information signals selectively to said columns of display cells, in synchronism with the scanning of the columns of glow priming cells to produce display glow discharges in selected display cells.
9. The panel defined in claim 1 wherein each column of cathode areas includes a plurality of display areas in series followed by a priming cathode area and this followed by a plurality of display cathode areas, followed by a priming cathode area.
10. The panel defined in claim 1 wherein each column of cathode areas includes a plurality of display cathode areas and at least one priming cathode area.
11. The panel defined in claim 1 wherein each column of cathode areas includes a series of display cathode areas and priming cathode areas at the ends thereof.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US55135975A | 1975-02-20 | 1975-02-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1053737A true CA1053737A (en) | 1979-05-01 |
Family
ID=24200946
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA245,072A Expired CA1053737A (en) | 1975-02-20 | 1976-02-05 | Display panel with matrix of cathode pairs |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS51139259A (en) |
| CA (1) | CA1053737A (en) |
| DE (1) | DE2603043A1 (en) |
| GB (1) | GB1481941A (en) |
| NL (1) | NL7601045A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1585709A (en) * | 1978-01-17 | 1981-03-11 | Philips Electronic Associated | Gas discharge display and panel therefor |
-
1976
- 1976-01-20 GB GB209276A patent/GB1481941A/en not_active Expired
- 1976-01-28 DE DE19762603043 patent/DE2603043A1/en not_active Withdrawn
- 1976-02-02 NL NL7601045A patent/NL7601045A/en not_active Application Discontinuation
- 1976-02-05 CA CA245,072A patent/CA1053737A/en not_active Expired
- 1976-02-06 JP JP1274476A patent/JPS51139259A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| GB1481941A (en) | 1977-08-03 |
| JPS51139259A (en) | 1976-12-01 |
| NL7601045A (en) | 1976-08-24 |
| DE2603043A1 (en) | 1976-09-02 |
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