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EP1006554A1 - Amélioration aux panneaux à plasma de type coplanaire - Google Patents

Amélioration aux panneaux à plasma de type coplanaire Download PDF

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Publication number
EP1006554A1
EP1006554A1 EP99402892A EP99402892A EP1006554A1 EP 1006554 A1 EP1006554 A1 EP 1006554A1 EP 99402892 A EP99402892 A EP 99402892A EP 99402892 A EP99402892 A EP 99402892A EP 1006554 A1 EP1006554 A1 EP 1006554A1
Authority
EP
European Patent Office
Prior art keywords
array
tile
electrodes
barriers
plasma panel
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.)
Withdrawn
Application number
EP99402892A
Other languages
German (de)
English (en)
Inventor
Guy Baret
Pierre-Paul Jobert
Yvan Raverdy
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thomson Plasma SAS
Original Assignee
Thomson Plasma SAS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Thomson Plasma SAS filed Critical Thomson Plasma SAS
Publication of EP1006554A1 publication Critical patent/EP1006554A1/fr
Withdrawn legal-status Critical Current

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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
    • H01J11/10—AC-PDPs with at least one main electrode being out of contact with the plasma
    • H01J11/12—AC-PDPs with at least one main electrode being out of contact with the plasma with main electrodes provided on both sides of the discharge space
    • 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
    • H01J11/20—Constructional details
    • H01J11/22—Electrodes, e.g. special shape, material or configuration
    • H01J11/32—Disposition of the electrodes
    • 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
    • H01J11/20—Constructional details
    • H01J11/34—Vessels, containers or parts thereof, e.g. substrates
    • H01J11/36—Spacers, barriers, ribs, partitions or the like
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2211/00—Plasma display panels with alternate current induction of the discharge, e.g. AC-PDPs
    • H01J2211/20—Constructional details
    • H01J2211/22—Electrodes
    • H01J2211/32—Disposition of the electrodes
    • H01J2211/326—Disposition of electrodes with respect to cell parameters, e.g. electrodes within the ribs

Definitions

  • the present invention relates to plasma panels more particularly plasma panels of the coplanar type.
  • Plasma panels are image display screens of the flat-screen type.
  • PDP Plasma panels
  • two panel structures are currently used, namely so-called matrix structures, in which the sustaining discharges and the addressing discharges take place between an array of electrodes on the front substrate and an array of electrodes on the rear substrate, and so-called coplanar structures, in which the sustaining discharges are produced between two parallel arrays of electrodes deposited on the front substrate and the addressing discharges take place between one of the arrays of electrodes on the front substrate and the array of electrodes on the rear substrate.
  • the present invention relates more particularly to the latter type of structure.
  • coplanar-type plasma panels currently manufactured firstly comprise a rear substrate 1 consisting of a glass tile.
  • an addressing or column array of electrodes 2 is produced on this glass tile.
  • This array of electrodes 2 is possibly covered with a dielectric layer 3, this layer being necessary for AC operation.
  • barriers 4 are deposited on this layer 3, these barriers being described in greater detail below.
  • the plasma panel shown in Figure 1 also includes a front element consisting of a front tile 5 made of glass.
  • An array of two parallel electrodes 6 and 6', forming the sustaining electrodes, has been deposited on this tile.
  • these electrodes are made of a transparent material such as indium tin oxide, called ITO.
  • an electrode-bus 7, 7' made of a metallic material such as aluminium or silver, or a chromium-copper-chromium coating is also deposited on each of these electrodes 6 or 6'.
  • a dielectric layer 8 usually made of a lead borosilicate glass frit, is deposited on the sustaining electrodes 6, 6'.
  • This layer 8 is covered with a protective layer 9, generally made of magnesium oxide (MgO).
  • MgO magnesium oxide
  • the barriers 4 are always of the "supporting" type, that is to say their height h corresponds to the distance separating the rear element from the front element of the panel.
  • barriers have the shape of walls with a width l of between 40 and 100 ⁇ m and their height h is between 120 and 200 ⁇ m. Since these barriers are of the "supporting" type, they must be uniform in height - their height cannot vary by more than at most +/- 3%. This is because too great a height variation ⁇ h means that there is a space ⁇ h between the top of a barrier and the front substrate. This space may be sufficient to allow extension of the discharge from one cell into its neighbour by charge transfer. This phenomenon is detrimental to the operation of the panel. Indeed, the existence of a channel formed by this space allows charge diffusion between adjacent cells, one of which may be ignited while the other is extinguished. This charge diffusion then causes unintentional ignition of the so-called extinguished cell.
  • barriers are always deposited on the rear substrate 1 because the sustaining discharges are produced at the surface of the front substrate.
  • these barriers define a cup, an arrangement which allows the phosphors Ip to be received, and these phosphors must not be in contact with the discharge in order to prevent their degradation.
  • the object of the present invention is to propose a novel plasma panel structure of the coplanar type, allowing the various drawbacks mentioned above to be overcome.
  • the subject of the present invention is therefore a plasma panel comprising a first tile called the rear tile and a second tile called the front tile, the two tiles being joined together with a distance of separation defining a space filled with gas, a first array of electrodes which is formed from a set of two parallel electrodes, called the sustaining electrodes, which are positioned on one of the tiles, a second array of electrodes, called the addressing electrodes, which are placed on the other tile perpendicular to the first array, and an array of barriers which is placed on one of the tiles parallel to the array of addressing electrodes, characterized in that the array of barriers is positioned on the tile carrying the first array of electrodes.
  • the barriers have a height of less than the distance of separation between the two tiles, the separation between the two tiles being obtained by specific spacing means.
  • the present invention may also apply to panels having full-height barriers.
  • the array of barriers is placed on the rear tile and the height of the barriers is between 60 and 80% of the distance of separation between the tiles.
  • a first array of phosphors is deposited on the front tile and a second array of phosphors is deposited on the rear tile in regions not subjected to discharges.
  • the purpose of this second array of phosphors is to increase the area covered by phosphors and therefore the light output of the panel.
  • the second array of phosphors is preferably deposited on the side wall of the barriers.
  • the spacing means consists of balls or studs, the balls or studs being positioned either on the front tile or on the rear tile.
  • the present invention also relates to a rear element for a plasma panel characterized in that it comprises:
  • the array of sustaining electrodes is produced by photoetching thin metal layers or by screen printing a conductive paste, such as a silver paste.
  • a conductive paste such as a silver paste.
  • the dielectric layer consists of a paste containing a glass frit such as a lead borosilicate and the protective layer consists of a layer of magnesia.
  • the rear element also includes an array of phosphors which is deposited in the regions not subjected to discharges.
  • the present invention also relates to a front element for a plasma panel, characterized in that it comprises:
  • the array of addressing electrodes is produced by photoetching a transparent conductive layer
  • the insulating material consists of a glass frit, such as a lead borosilicate, or of silica, alumina or magnesium oxide deposited as thin films.
  • the front element includes, between the array of addressing electrodes and the layer of insulating material, a black matrix deposited in the low-emissivity regions of the surface in order to reduce the diffuse reflection coefficient of the panel.
  • FIG 2 shows, in schematic perspective, a small part of a rear element of a plasma panel according to the present invention.
  • the rear element therefore comprises a rear tile 10, more particularly a glass tile, on which an array of a set of two sustaining electrodes 11, 11' has been deposited.
  • These electrodes the resistivity of which must not be too high, namely 100 ⁇ for one electrode, are produced either by photoetching thin metal layers or by direct deposition, such as the screen printing of a silver paste.
  • the array of sustaining electrodes is covered with a layer 13 of a so-called thick dielectric material. This layer is generally obtained by deposition, using screen printing, of a paste containing a glass frit such as a lead borosilicate.
  • the assembly is fired at a temperature of between 520 and 590°C. Typically, the assembly is fired at 570°C for half an hour.
  • a dielectric layer having a thickness of approximately 20 to 30 ⁇ m is obtained.
  • a white pigment may be added in a known manner to the dielectric.
  • This protective layer is preferably a layer of magnesia or MgO deposited with a thickness of 0.5 to 1 ⁇ m approximately, by gun evaporation. This layer of magnesia also makes it possible to lower the operating voltages of the device.
  • an array of barriers 15 is produced on the protective layer.
  • These barriers may be produced using various known techniques, for example by photolithography, screen printing or peening. They are made of a material such as a composition of the lead borosilicate type to which a mineral filler, of silica or alumina, may or may not be added.
  • Figure 2 shows an array of barriers 15 called non-supporting barriers, that is to say barriers having a height H of less than the distance separating the two tiles.
  • the present invention may also apply to a panel provided, in a conventional manner with full-height or "supporting" barriers.
  • the height of the non-supporting barriers is between 60 and 80% of the distance of separation E, as shown in Figure 3, which separates the two, front and rear, elements of the plasma panel when the latter is completed. More specifically, the height H of the barriers varies between 30 ⁇ m for high-resolution panels and 150 ⁇ m for panels used especially in television.
  • Figures 2 and 3 show rectangular barriers. In fact, the shape of the barriers, in terms of area and of profile, is adapted to the arrangement of the cells.
  • the rear element may receive an array of phosphors 17 consisting in a known manner of green, red and blue phosphors allowing a colour plasma panel to be produced.
  • these phosphors are deposited only on the regions not subjected to the discharge and more particularly on the side wall of the barriers, as is shown in Figures 2 and 3.
  • Figure 2 shows a spacing means 16 consisting of a ball. This spacing means 16 is deposited in separate regions of the cells and has a height H1 corresponding to the distance of separation E in Figure 3.
  • This front element consists of a front tile 20 made more particularly of glass.
  • An array of addressing electrodes 21 has been deposited on this front tile 20.
  • These addressing electrodes are produced, for example, by photoetching a transparent conductive layer, such as one made of ITO. This is because these electrodes require only quite a low conductivity.
  • the transparent material has a very low conductivity, especially when this material consists of tin oxide, the array of addressing electrodes may be covered with a metal bus, not shown. This bus is deposited as in the embodiment in Figure 1.
  • a black matrix 24 may be placed in the low-emissivity regions of the surface. This black matrix is intended to reduce the diffuse reflection coefficient of the panel. Moreover, according to an additional variant, colour filters may also be used to reduce the diffuse reflection coefficient of the panel.
  • a layer 22 of an insulating material is deposited on the array of addressing electrodes 21. This layer of insulating material may be made either of a glass frit, such as a lead borosilicate, or of silica, alumina or magnesium oxide. In the case of a glass frit, it is necessary to fire the layer, which then has a thickness of 10 to 30 ⁇ m.
  • this material is deposited as thin films, which does not require firing.
  • an array of phosphors 23 is deposited above the addressing electrodes 21 in the part facing the cups produced between the barriers 15, the deposited coatings being produced in such a way that the G, R and B colours of the phosphors are in mutual correspondence.
  • Figure 2 shows a panel in which the spacing device formed by the balls 16 is deposited on the rear element.
  • the balls could also be deposited on the front element between the dielectric layer and the phosphors.
  • a seal is used to close the panel in a gastight manner. This seal may be deposited equally well on the front element or the rear element of the plasma panel.
  • the barriers 15 is no longer a critical value and a uniformity of between 5 and 10% is acceptable.
  • the addressing electrodes may be easily made of a transparent conductor such as ITO and generally do not require a metal bus since the addressing electrodes need to have a low conductivity with respect to the sustaining electrodes.
  • the spacing means may be formed by studs or other means produced by screen printing, photolithography or an equivalent process.
  • the present invention may therefore apply to various types of structure for coplanar-type plasma panels.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Gas-Filled Discharge Tubes (AREA)
EP99402892A 1998-11-30 1999-11-22 Amélioration aux panneaux à plasma de type coplanaire Withdrawn EP1006554A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9815056A FR2786607B1 (fr) 1998-11-30 1998-11-30 Perfectionnement aux panneaux a plasma de type coplanaire
FR9815056 1998-11-30

Publications (1)

Publication Number Publication Date
EP1006554A1 true EP1006554A1 (fr) 2000-06-07

Family

ID=9533353

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99402892A Withdrawn EP1006554A1 (fr) 1998-11-30 1999-11-22 Amélioration aux panneaux à plasma de type coplanaire

Country Status (4)

Country Link
EP (1) EP1006554A1 (fr)
JP (1) JP2000200552A (fr)
FR (1) FR2786607B1 (fr)
TW (1) TW544646B (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4206386A (en) * 1977-04-18 1980-06-03 Matsushita Electric Industrial Co., Ltd. Gas discharge display device
JPS6222352A (ja) * 1985-07-19 1987-01-30 Fujitsu Ltd ガス放電パネル
JPS6244931A (ja) * 1985-08-23 1987-02-26 Canon Inc 放電ガスデイスプレイ・パネル
JPH0644911A (ja) * 1992-04-20 1994-02-18 Nec Corp プラズマディスプレイパネルおよびその製造方法
JPH0896714A (ja) * 1994-09-28 1996-04-12 Nec Corp プラズマディスプレイパネルとその駆動方法
JPH09129139A (ja) * 1995-11-01 1997-05-16 Oki Electric Ind Co Ltd 交流型プラズマディスプレイパネルおよびその駆動方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4206386A (en) * 1977-04-18 1980-06-03 Matsushita Electric Industrial Co., Ltd. Gas discharge display device
JPS6222352A (ja) * 1985-07-19 1987-01-30 Fujitsu Ltd ガス放電パネル
JPS6244931A (ja) * 1985-08-23 1987-02-26 Canon Inc 放電ガスデイスプレイ・パネル
JPH0644911A (ja) * 1992-04-20 1994-02-18 Nec Corp プラズマディスプレイパネルおよびその製造方法
JPH0896714A (ja) * 1994-09-28 1996-04-12 Nec Corp プラズマディスプレイパネルとその駆動方法
JPH09129139A (ja) * 1995-11-01 1997-05-16 Oki Electric Ind Co Ltd 交流型プラズマディスプレイパネルおよびその駆動方法

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 011, no. 195 (E - 518) 23 June 1987 (1987-06-23) *
PATENT ABSTRACTS OF JAPAN vol. 011, no. 227 (E - 526) 23 July 1987 (1987-07-23) *
PATENT ABSTRACTS OF JAPAN vol. 018, no. 263 (E - 1550) 19 May 1994 (1994-05-19) *
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 09 30 September 1997 (1997-09-30) *
PATENT ABSTRACTS OF JAPAN vol. 96, no. 8 30 August 1996 (1996-08-30) *

Also Published As

Publication number Publication date
FR2786607B1 (fr) 2001-01-05
JP2000200552A (ja) 2000-07-18
FR2786607A1 (fr) 2000-06-02
TW544646B (en) 2003-08-01

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