EP0123496A2 - Method of making a display panel - Google Patents
Method of making a display panel Download PDFInfo
- Publication number
- EP0123496A2 EP0123496A2 EP84302593A EP84302593A EP0123496A2 EP 0123496 A2 EP0123496 A2 EP 0123496A2 EP 84302593 A EP84302593 A EP 84302593A EP 84302593 A EP84302593 A EP 84302593A EP 0123496 A2 EP0123496 A2 EP 0123496A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- layer
- electrode
- plate
- top surface
- insulating material
- 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.)
- Granted
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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
-
- 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
Definitions
- a recently invented display panel which comprises a dot matrix display having memory is relatively complex and includes several support plates, insulating layers, and electrode arrays which must be prepared and assembled accurately. This panel is described and claimed in copending application Serial No. 051,313, filed June 22, 1979.
- the present invention relates to improvements in the panel which simplify its preparation.
- the present invention is used to manufacture a display panel 10 of the type described and claimed in copending application of George E. Holz and James A. Ogle, Serial No. 051,313, filed June 22, 1979, and incorporated herein by reference, along with the patents and publications cited therein.
- This application describes a dot matrix memory display panel including a D.C. scanning portion and an A.C. display portion.
- the display panel 10 includes a gas-filled envelope made up of an insulating base plate 20 and a glass face plate 30, which are hermetically sealed together, as illustrated in Fig. 2, along a closed periphery which surrounds the operating inner portion of the panel and the various gas cells provided therein.
- the base plate has a top surface 22, in which a plurality of relatively deep parallel longitudinal slots 40 are formed and in each of which a scan/address anode electrode, for example a wire 50, is seated and secured.
- a plurality of scan cathode electrodes in the form of wires or strips 60 are seated on the top surface of the base plate or in shallow slots 70.
- the scan cathodes 60 are disposed transverse to the scan anodes 50, and each crossing of a scan cathode 60 and a scan anode 40 defines a scanning cell 72 (Fig. 2). It can be seen that the scanning cells are arrayed in rows and columns. More specifically, the cathode portions 61, the underlying portions of anodes 50, and the intermediate gaseous regions define the scanning cells.
- the scan cathodes 60A, B, C, etc. form a series of cathodes which can be energized serially in a scanning cycle, with cathode 60A being the first cathode energized in the scanning cycle.
- a reset cathode electrode 62 is disposed in a slot 64 in the top surface of the base plate adjacent to the first scan cathode 60A, so that, when it is energized, it provides excited particles for cathode 60A at the beginning of a scanning cycle to be described.
- a reset cell is formed, and the crossing of all of the scan anodes by the reset cathode provides a column of reset cells.
- These reset cells are turned on or energized at the beginning of each scanning cycle, and they expedite the turn-on of the first column of scanning cells associated with the first cathode 60A.
- the cathodes 60 or at least the portions 61 thereof which are disposed in the scanning cells, be spaced uniformly from an electrode 80 positioned above the cathodes and described below.
- the cathode grooves or slots 70 must be of uniform depth. It is also desirable to provide means for preventing the spread of cathode glow from the operating portions 61 of the cathodes to the intermediate portions. These conditions are satisfied by providing insulating strips 74 between the top surface 22 of the base plate and the cathodes 60 and adjacent electrode plate 80, the priming plate. The strips are aligned with the anode slots 40 and are seated on the lands between these slots.
- the portions of the panel described up to this point comprise the base plate assembly. This is the D.C. portion and the scanning and addressing portion of the panel.
- Adjacent to the base plate assembly is the second portion of the panel which is a quasi A.C. assembly; that is, it includes A.C. and D.C. features.
- This portion of the panel includes an electrode in the form of a thin metal plate 80 having an array of rows and columns of relatively small apertures 92, each overlying one of the scanning cells.
- the plate 80 is positioned close to cathodes 60 and may be seated on insulating sheet 74.
- Electrode plate 80 includes a terminal 88 for making electrical connection thereto.
- apertured plate or layer 86 Adjacent to plate 80, and preferably in contact with the upper surface thereof, is an apertured plate or layer 86 having-rows and columns of apertures 94 which are considerably larger than apertures 92.
- the apertures 94 comprise the display cells of panel 10.
- the sheet 86 may be of insulating material, as shown in Fig. 2, or it may be ot metal, and, if it is of metal, the plates 80 and 86 may be made in one piece, if desired and if feasible.
- the quasi A.C. assembly also includes a face plate assembly which comprises face plate 30 and a large-area transparent conductive electrode 100 on the inner surface of the plate 30, together with a narrow conductor 110 of silver or the like which outlines and reinforces the- -electrode layer 100 to increase its conductivity.
- the conductor 110 includes a portion 114, to which external connection can be made.
- the large-area electrode 100 overlies the entire array of display cells 94 in plate 86.
- An insulating coating 120 of glass or the like covers electrode 100, and, if desired, a dielectric layer 132 of magnesium oxide, thorium oxide, or the like is coated on layer 120.
- the apertures 94 in plate 86 comprise display cells, and, as can be seen in Fig. 2, each display cell has one end wall 134 formed by a portion of insulating layer 132, and an opposite end wall 136 formed by a portion of the top surface of plate 80.
- a coating of the material of layer 132 should also be provided on the base or lower wall 136 of each display cell 94, such as the layer 1.33 shown in Fig. 2.
- Panel 10 has a keep-alive arrangement which includes an A.C. electrode 140 in the form of a linear conductive film or layer of opaque metal, such as silver, provided on the inner surface of the face plate 30 adjacent to one edge of the transparent conductive electrode 100.
- the A.C. keep-alive electrode 140 is positioned so that it is in optimum operative relation with the column of reset cells and reset cathode 62, to which it supplies excited particles.
- The.A.C. keep-alive electrode 140 is covered by the insulating layers 120 and 132.
- the plate 86 is provided with a slot 142
- plate 80 is provided with a column of holes 150, the slot 142 overlying and being aligned with the column of holes 150, and both lie beneath and are aligned with the A.C.
- Electrode 140 operates with plate 80 to produce glow discharge between them and produce excited particles in slot 142 and holes 150. These excited particles are available to the reset cathode 62 and assist the firing of the column of reset cells.
- the gas filling in panel 10 is preferably a Penning gas mixture of, for example, neon and a small percentage of xenon, at a pressure of about 400 Torr.
- the gas filling is introduced through a tubulation 24 secured to base plate 20 (Fig. 2), or a non-tubulated construction can be employed.
- the base plate assembly including plate 20 and the anodes 50 and cathodes 60, is prepared in any suitable manner, for example, as described in the herein-incorporated U. S. Patent No. 4,352,050 of Nicholas C. Andreadakis.
- the assembly of priming plate 80, glow isolator plate 86, and insulating strips 74 is prepared as a subassembly as follows.
- the metal plate 80 having holes 92 and 150 formed therein is coated on its top surface with a thin layer of glass or other etchable dielectric material such as Corning 7575 glass.
- a similar layer 170 is provided on its bottom surface. Both dielectric layers 160 and 170 are coated with layers 180 and 190 of a suitable photoresist.
- the bottom photoresist layer 190 is then exposed and developed to provide non-removable strip- like regions 200 which extend along the photoresist layer between the rows of holes 92 and will ultimately form strips 74.
- the top photoresist layer 180 is exposed and developed to provide a pattern of regions which, when the layer is later etched, will form the apertures or cells 94.
- the assembly thus described is then treated with a suitable acid to etch layers 170 and 180 at the same time to provide the strips 74 and the layer of cells 94, as shown in Fig. 4.
- This subassembly is then joined with the base plate assembly and the face plate assembly described above, as illustrated in dash lines in Fig. 4, and the parts are sealed together and processed to form the completed panel.
- the operation of the panel 10 is not set forth in detail herein since it is described in detail in the above-mentioned applications. However, a brief description of the panel operation is as follows: With the keep-alive electrodes generating excited particles, and with operating potential applied to the scan anodes 50, the reset cathode 62 is energized to fire the column of reset cells, and then the scan cathodes 60 are energized sequentially to carry out a scanning operation in the lower portion of the panel. At the same time, with sustaining pulses applied between the electrodes 80 and 100, as each column of scan cells is energized, information or display signals are applied to the proper scan anodes 50 to cause glow to develop in the associated display cells 94 where it is sustained by the sustaining pulses. When all of the columns of scan cells have been energized and the appropriate associated display cells have been energized, a sustained and visible message is present in the upper display portion of the panel.
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Gas-Filled Discharge Tubes (AREA)
Abstract
Description
- A recently invented display panel which comprises a dot matrix display having memory is relatively complex and includes several support plates, insulating layers, and electrode arrays which must be prepared and assembled accurately. This panel is described and claimed in copending application Serial No. 051,313, filed June 22, 1979.
- The present invention relates to improvements in the panel which simplify its preparation.
-
- Fig. 1 is a perspective, exploded view of a display panel embodying the invention;
- Fig. 2 is a sectional view through the panel of Fig. 1 along lines 2-2, with the panel shown assembled;
- Fig. 3 is a sectional view of the priming plate-glow isolator assembly of the display panel of the invention at one stage in its manufacture;
- Fig. 4 is a view of the apparatus of Fig. 3 at a later stage in its prepdaration; and
- Fig. 5 is a perspective view of a portion of the assembly of Fig. 4 at a later stage in its preparation.
- The present invention is used to manufacture a
display panel 10 of the type described and claimed in copending application of George E. Holz and James A. Ogle, Serial No. 051,313, filed June 22, 1979, and incorporated herein by reference, along with the patents and publications cited therein. This application describes a dot matrix memory display panel including a D.C. scanning portion and an A.C. display portion. - The
display panel 10 includes a gas-filled envelope made up of aninsulating base plate 20 and aglass face plate 30, which are hermetically sealed together, as illustrated in Fig. 2, along a closed periphery which surrounds the operating inner portion of the panel and the various gas cells provided therein. The base plate has atop surface 22, in which a plurality of relatively deep parallellongitudinal slots 40 are formed and in each of which a scan/address anode electrode, for example awire 50, is seated and secured. - A plurality of scan cathode electrodes in the form of wires or
strips 60 are seated on the top surface of the base plate or inshallow slots 70. Thescan cathodes 60 are disposed transverse to thescan anodes 50, and each crossing of ascan cathode 60 and ascan anode 40 defines a scanning cell 72 (Fig. 2). It can be seen that the scanning cells are arrayed in rows and columns. More specifically, thecathode portions 61, the underlying portions ofanodes 50, and the intermediate gaseous regions define the scanning cells. - The
scan cathodes 60A, B, C, etc., form a series of cathodes which can be energized serially in a scanning cycle, withcathode 60A being the first cathode energized in the scanning cycle. - A
reset cathode electrode 62 is disposed in aslot 64 in the top surface of the base plate adjacent to thefirst scan cathode 60A, so that, when it is energized, it provides excited particles forcathode 60A at the beginning of a scanning cycle to be described. Where the reset cathode crosses each scan anode, a reset cell is formed, and the crossing of all of the scan anodes by the reset cathode provides a column of reset cells. These reset cells are turned on or energized at the beginning of each scanning cycle, and they expedite the turn-on of the first column of scanning cells associated with thefirst cathode 60A. - In the
panel 10, it is desirable that thecathodes 60, or at least theportions 61 thereof which are disposed in the scanning cells, be spaced uniformly from anelectrode 80 positioned above the cathodes and described below. Thus, the cathode grooves orslots 70 must be of uniform depth. It is also desirable to provide means for preventing the spread of cathode glow from theoperating portions 61 of the cathodes to the intermediate portions. These conditions are satisfied by providinginsulating strips 74 between thetop surface 22 of the base plate and thecathodes 60 andadjacent electrode plate 80, the priming plate. The strips are aligned with theanode slots 40 and are seated on the lands between these slots. - The portions of the panel described up to this point comprise the base plate assembly. This is the D.C. portion and the scanning and addressing portion of the panel.
- Adjacent to the base plate assembly is the second portion of the panel which is a quasi A.C. assembly; that is, it includes A.C. and D.C. features. This portion of the panel includes an electrode in the form of a
thin metal plate 80 having an array of rows and columns of relativelysmall apertures 92, each overlying one of the scanning cells. Theplate 80 is positioned close tocathodes 60 and may be seated on insulatingsheet 74.Electrode plate 80 includes a terminal 88 for making electrical connection thereto. - Adjacent to plate 80, and preferably in contact with the upper surface thereof, is an apertured plate or
layer 86 having-rows and columns ofapertures 94 which are considerably larger thanapertures 92. Theapertures 94 comprise the display cells ofpanel 10. - The
sheet 86 may be of insulating material, as shown in Fig. 2, or it may be ot metal, and, if it is of metal, theplates - The quasi A.C. assembly also includes a face plate assembly which comprises
face plate 30 and a large-area transparentconductive electrode 100 on the inner surface of theplate 30, together with anarrow conductor 110 of silver or the like which outlines and reinforces the- -electrode layer 100 to increase its conductivity. Theconductor 110 includes aportion 114, to which external connection can be made. The large-area electrode 100 overlies the entire array ofdisplay cells 94 inplate 86. An insulatingcoating 120 of glass or the like covers electrode 100, and, if desired, adielectric layer 132 of magnesium oxide, thorium oxide, or the like is coated onlayer 120. - In
panel 10, theapertures 94 inplate 86 comprise display cells, and, as can be seen in Fig. 2, each display cell has oneend wall 134 formed by a portion of insulatinglayer 132, and anopposite end wall 136 formed by a portion of the top surface ofplate 80. To provide cell uniformity and to minimize cathode sputtering, a coating of the material oflayer 132 should also be provided on the base orlower wall 136 of eachdisplay cell 94, such as the layer 1.33 shown in Fig. 2. -
Panel 10 has a keep-alive arrangement which includes anA.C. electrode 140 in the form of a linear conductive film or layer of opaque metal, such as silver, provided on the inner surface of theface plate 30 adjacent to one edge of the transparentconductive electrode 100. The A.C. keep-alive electrode 140 is positioned so that it is in optimum operative relation with the column of reset cells and resetcathode 62, to which it supplies excited particles. The.A.C. keep-alive electrode 140 is covered by the insulatinglayers plate 86 is provided with aslot 142, andplate 80 is provided with a column ofholes 150, theslot 142 overlying and being aligned with the column ofholes 150, and both lie beneath and are aligned with theA.C. electrode 140. Theslot 142 in theplate 86 is narrower than theopaque A.C. electrode 140 so that a viewer, looking throughface plate 30, cannot see any glow which is present inslot 142 and holes 150.Electrode 140 operates withplate 80 to produce glow discharge between them and produce excited particles inslot 142 and holes 150. These excited particles are available to thereset cathode 62 and assist the firing of the column of reset cells. - The gas filling in
panel 10 is preferably a Penning gas mixture of, for example, neon and a small percentage of xenon, at a pressure of about 400 Torr. When the panel has been constructed and evacuated, the gas filling is introduced through atubulation 24 secured to base plate 20 (Fig. 2), or a non-tubulated construction can be employed. - In making the
panel 10, the base plate assembly, includingplate 20 and theanodes 50 andcathodes 60, is prepared in any suitable manner, for example, as described in the herein-incorporated U. S. Patent No. 4,352,050 of Nicholas C. Andreadakis. According to the invention, the assembly of primingplate 80,glow isolator plate 86, and insulatingstrips 74 is prepared as a subassembly as follows. Themetal plate 80 havingholes similar layer 170 is provided on its bottom surface. Bothdielectric layers layers - The
bottom photoresist layer 190 is then exposed and developed to provide non-removable strip-like regions 200 which extend along the photoresist layer between the rows ofholes 92 and will ultimately form strips 74. Thetop photoresist layer 180 is exposed and developed to provide a pattern of regions which, when the layer is later etched, will form the apertures orcells 94. The assembly thus described is then treated with a suitable acid to etchlayers strips 74 and the layer ofcells 94, as shown in Fig. 4. This subassembly is then joined with the base plate assembly and the face plate assembly described above, as illustrated in dash lines in Fig. 4, and the parts are sealed together and processed to form the completed panel. - The operation of the
panel 10 is not set forth in detail herein since it is described in detail in the above-mentioned applications. However, a brief description of the panel operation is as follows: With the keep-alive electrodes generating excited particles, and with operating potential applied to thescan anodes 50, thereset cathode 62 is energized to fire the column of reset cells, and then the scan cathodes 60 are energized sequentially to carry out a scanning operation in the lower portion of the panel. At the same time, with sustaining pulses applied between theelectrodes proper scan anodes 50 to cause glow to develop in the associateddisplay cells 94 where it is sustained by the sustaining pulses. When all of the columns of scan cells have been energized and the appropriate associated display cells have been energized, a sustained and visible message is present in the upper display portion of the panel.
Claims (3)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US48700783A | 1983-04-21 | 1983-04-21 | |
US487007 | 1983-04-21 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0123496A2 true EP0123496A2 (en) | 1984-10-31 |
EP0123496A3 EP0123496A3 (en) | 1985-11-21 |
EP0123496B1 EP0123496B1 (en) | 1988-07-13 |
Family
ID=23934029
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19840302593 Expired EP0123496B1 (en) | 1983-04-21 | 1984-04-17 | Method of making a display panel |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0123496B1 (en) |
JP (1) | JPS59205127A (en) |
CA (1) | CA1249120A (en) |
DE (1) | DE3472735D1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0545642A1 (en) * | 1991-11-29 | 1993-06-09 | Technology Trade And Transfer Corporation | Display discharge tubes |
EP0867909A1 (en) * | 1996-09-18 | 1998-09-30 | Technology Trade And Transfer Corporation | Plasma display discharge tube and method for driving the same |
EP0784333A3 (en) * | 1996-01-11 | 1998-09-30 | Hitachi, Ltd. | Gas discharging type display panel and manufacturing method thereof |
EP0920048A2 (en) * | 1997-12-01 | 1999-06-02 | Hitachi, Ltd. | Plasma display panel and image display apparatus using the same |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4352040A (en) * | 1980-07-14 | 1982-09-28 | Burroughs Corporation | Display panel with anode and cathode electrodes located in slots of base plate |
-
1984
- 1984-04-17 EP EP19840302593 patent/EP0123496B1/en not_active Expired
- 1984-04-17 JP JP7827884A patent/JPS59205127A/en active Pending
- 1984-04-17 DE DE8484302593T patent/DE3472735D1/en not_active Expired
- 1984-04-19 CA CA000452536A patent/CA1249120A/en not_active Expired
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4352040A (en) * | 1980-07-14 | 1982-09-28 | Burroughs Corporation | Display panel with anode and cathode electrodes located in slots of base plate |
Non-Patent Citations (2)
Title |
---|
ELECTRONICS INTERNATIONAL, vol. 55, no. 7, April 1982, pages 125-132, New York, US; R.BERESFORD: "Panels challenge tubes in alphanumeric display" * |
TECHNICAL DISCLOSURE BULLETIN, vol. 18, no. 3, August 1975, pages 793-794; M.BECKERMAN et al.: "Etched dielectric gas discharge panel construction" * |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0545642A1 (en) * | 1991-11-29 | 1993-06-09 | Technology Trade And Transfer Corporation | Display discharge tubes |
EP0784333A3 (en) * | 1996-01-11 | 1998-09-30 | Hitachi, Ltd. | Gas discharging type display panel and manufacturing method thereof |
US5883462A (en) * | 1996-01-11 | 1999-03-16 | Hitachi, Ltd. | AC gas discharging type display panel with metal partition member |
EP0867909A1 (en) * | 1996-09-18 | 1998-09-30 | Technology Trade And Transfer Corporation | Plasma display discharge tube and method for driving the same |
EP0867909A4 (en) * | 1996-09-18 | 2000-01-19 | Technology Trade & Transfer | Plasma display discharge tube and method for driving the same |
EP0920048A2 (en) * | 1997-12-01 | 1999-06-02 | Hitachi, Ltd. | Plasma display panel and image display apparatus using the same |
EP0920048A3 (en) * | 1997-12-01 | 1999-09-08 | Hitachi, Ltd. | Plasma display panel and image display apparatus using the same |
US6414435B1 (en) | 1997-12-01 | 2002-07-02 | Hitachi, Ltd. | AC drive type plasma display panel having display electrodes on front and back plates, and image display apparatus using the same |
US6696787B2 (en) | 1997-12-01 | 2004-02-24 | Hitachi, Ltd. | AC drive type plasma display panel having display electrodes on front and back plates, and image display apparatus using the same |
US6784616B2 (en) | 1997-12-01 | 2004-08-31 | Hitachi, Ltd. | AC drive type plasma display panel having display electrodes on front and back plates, and image display apparatus using the same |
US7046218B2 (en) | 1997-12-01 | 2006-05-16 | Hitachi, Ltd. | AC drive type plasma display panel having display electrodes on front and back plates, and image display apparatus using the same |
Also Published As
Publication number | Publication date |
---|---|
DE3472735D1 (en) | 1988-08-18 |
EP0123496A3 (en) | 1985-11-21 |
EP0123496B1 (en) | 1988-07-13 |
JPS59205127A (en) | 1984-11-20 |
CA1249120A (en) | 1989-01-24 |
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