EP0350348A1 - Plasmaanzeigevorrichtung mit koplanarer Auffrischwechselspannung - Google Patents

Plasmaanzeigevorrichtung mit koplanarer Auffrischwechselspannung Download PDF

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Publication number
EP0350348A1
EP0350348A1 EP89401639A EP89401639A EP0350348A1 EP 0350348 A1 EP0350348 A1 EP 0350348A1 EP 89401639 A EP89401639 A EP 89401639A EP 89401639 A EP89401639 A EP 89401639A EP 0350348 A1 EP0350348 A1 EP 0350348A1
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EP
European Patent Office
Prior art keywords
electrodes
family
maintenance
electrode
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Withdrawn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
EP89401639A
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English (en)
French (fr)
Inventor
Serge Salavin
Jacques Deschamps
Michel Gay
Michel Specty
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.)
Thales SA
Original Assignee
Thomson CSF SA
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Filing date
Publication date
Application filed by Thomson CSF SA filed Critical Thomson CSF SA
Publication of EP0350348A1 publication Critical patent/EP0350348A1/de
Withdrawn legal-status Critical Current

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    • 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
    • H01J11/14—AC-PDPs with at least one main electrode being out of contact with the plasma with main electrodes provided only on one side of the discharge space

Definitions

  • the present invention relates to a plasma panel of the alternative type with coplanar maintenance, that is to say a plasma panel in which each elementary image point is defined substantially at the intersection of a first electrode (addressing electrode). with two other parallel electrodes called “maintenance electrodes”.
  • the invention particularly relates to a new arrangement of these maintenance electrodes.
  • Plasma panels are flat screen display devices, which allow the display of alphanumeric, graphic or other images, in color or not.
  • Plasma panels work on the principle of the emission of light produced by an electric discharge in a gas.
  • Plasma panels include two insulating tiles limiting a volume occupied by a gas (generally a mixture based on neon). These slabs support crossed conductive electrodes so as to define a matrix of image points or pixels.
  • An electric discharge in the gas, causing an emission of light at the level of an image point or pixel takes place when the electrodes of this pixel are suitably excited.
  • the display of any image is based on the generation of discharges in the gas space at the level of selected pixels, each selected pixel corresponding to the crossing of electrodes to which appropriate signals are applied using a device. addressing.
  • Some plasma panels of the alternative type operate using only two crossed electrodes to define an elementary image point or pixel.
  • the advantage of such a structure is in particular that it is made relatively simple technology, and to be robust.
  • the most common structure is that in which an elementary image or pixel point is defined substantially at the intersection of a writing or addressing electrode with two parallel maintenance electrodes.
  • Such a device is shown in Figures 1 and 2, in accordance with the teaching of European patent document EP-A-0135 382. It comprises a glass slab 1, covered with a first and a second family of parallel maintenance electrodes 2 and 3 arranged in an alternation of an electrode 2 of the first family and an electrode 3 of the second family, these maintenance electrodes 2 and 3 being coplanar.
  • a succession of an electrode 2 of the first family with an electrode 3 of the second family constitutes a pair of maintenance electrodes belonging to the same line of elementary image points.
  • These electrodes are provided with recesses or projecting parts 2a and 3a which, in the same pair of maintenance electrodes 2 and 3, are oriented towards each other so as to concentrate discharges therebetween.
  • the assembly is covered with an insulating layer 4.
  • Writing electrodes 5 are crossed with the maintenance electrodes 2 and 3.
  • the assembly is covered with an insulating layer 6 and a protective layer 7 in MgO.
  • a second slab 8 completes the set.
  • a gas 9 is retained between the slabs 1 and 8 held apart by watertight shims (not shown).
  • the operating principle of a plasma panel of this type is as follows: an addressing discharge is selectively generated at the intersection of a writing electrode 5 with an electrode 2 of a given pair of electrodes d maintenance (in a pair of electrodes electrode 2 provides an addressing function and a maintenance function). This discharge results in the storage of electrical charges on the insulator covering these electrodes. These charges are then used to facilitate the initiation of maintenance discharges between the two electrodes of each pair. These discharges, which are those which provide most of the useful light, are maintained by means of voltage slots which are applied between the two electrodes of each pair of maintenance electrodes and which succeed each other with opposite polarities.
  • each elementary image point has two parallel maintenance electrodes, one of which belongs to a first family of electrodes (electrodes each providing an addressing and maintenance function), and the other of which belongs to a second family of electrodes (electrodes each ensuring only a maintenance function), the following facts are observed: - that the fact of having two parallel and coplanar electrode networks with different voltages, determines parasitic capacities, in particular capacities known as lateral capacities of large values, and which notably have the drawback of affecting considerably electrical efficiency: for example, it has been observed that such a parasitic capacitance of value 1nF generates an electrical loss of approximately 1 Watt, which is far from negligible when it is known that for coplanar maintenance electrodes , parallel, arranged in steps of 0.4 mm, the lateral capacity is of the order of 4.5 nF for a surface of the order of 1 dm2 (this commonly corresponds to the case of a high resolution panel having for example a number of 62,500 pixels per dm2);
  • the present invention aims to remedy the drawbacks mentioned above.
  • the invention proposes a new arrangement of coplanar maintenance electrodes, an arrangement which can be applied to any plasma panel using two parallel electrodes for the maintenance of discharges, as described for example previously with reference to FIGS. 1 and 2.
  • a plasma panel of the alternative type with coplanar maintenance comprising, crossed writing electrodes with a first and a second family of maintenance electrodes, the maintenance electrodes being side by side and substantially parallel, a pixel being defined substantially at each crossing of the writing electrodes with maintenance electrodes, is characterized in that the maintenance electrodes are arranged for at least part of them according to a succession of two electrodes of the second family followed by two electrodes of the first family, the electrodes of the second family being brought to the same potentials.
  • FIG. 3 partially shows a plasma panel 10 according to the invention.
  • the panel 10 is represented by several types of conductors or electrodes: a first type of electrodes constitutes a network of writing electrodes X1 to X6, which in FIG. 4 are arranged in columns; a second type of electrode consists of a first family of maintenance electrodes Y1 to Y6, arranged in lines perpendicular to the writing electrodes X1 to X6; a third type of electrodes is constituted by a second family of maintenance electrodes E1 to E6, parallel to the maintenance electrodes Y1 to Y6 of the first family.
  • each elementary image point or pixel P1 to P36 is formed, symbolized in the figure by an area delimited in dotted lines; that is to say that each elementary image point is defined by three electrodes constituted by a writing electrode X1 to X6, crossed with two maintenance electrodes, one of which Y1 to Y6 belongs to a first family and whose other E1 to E6 belongs to the second family.
  • the maintenance electrodes Y1 to Y6 and E1 to E6, as they appear in FIG. 4, are located in a plane deeper than the plane of the writing electrodes X1 to X6. It should be noted that, apart from a particular distribution and shape of these electrodes, in particular maintenance electrodes, the structure of the panel 10 can be similar, for example, to that of the plasma panel shown in FIGS. 1 and 2.
  • the plasma panel 10 of the invention may include a different number of electrodes, in particular higher, so as to constitute for example 1,000,000 or more pixels or elementary image points.
  • the maintenance electrodes Y1 to Y6 and E1 to E6 are side by side and parallel, and according to a characteristic of the invention, by considering them along the writing electrodes X1 to X6, they are arranged in an alternation of two maintenance electrodes Y1 to Y6 of the first family followed by two maintenance electrodes E1 to E6 of the second family, this of course with the possible exception of the start and end electrodes.
  • a first electrode Y1 of the first family starting from a part 11 of the panel 10 located at the top of the figure, there is the following succession of electrodes: a first electrode Y1 of the first family; then a first followed by a second electrode E1, E2 of the second family; then a second and a third electrode Y2, Y3 of the first family; then a third and a fourth electrode E3, E4 of the second family, then a fourth and a fifth electrode Y4, Y5 of the first family itself followed by a fifth and a sixth electrode E5, E6 of the second family ; and finally in the nonlimiting example described there is a sixth electrode Y6 of the first family.
  • the first maintenance electrodes Y1 and E1 belonging respectively to the first and to the second family of electrodes, constitute a first pair of maintenance electrodes p1 which is used for the maintenance of the discharges of the pixels P1 to P6; the two second maintenance electrodes E2, Y2 form a second pair of maintenance electrodes p2 assigned to the pixels P7 to P12; the third maintenance electrodes Y3, E3 belonging respectively to the first and to the second family are assigned to the pixels P13 to P18 and form a third pair p3; and so on up to the sixth electrodes E6, Y6 belonging respectively to the second and to the first family, which are assigned to the pixels P31 to P36.
  • the maintenance electrodes Y1 to Y6 on the one hand and E1 to E2 on the other hand comprise, at the level of each pixel P1 to P36, a projecting surface 12, 13, that is to say a surface or part protruding from the longitudinal edges 14, 15 of the electrodes of the same pair p1 to p6 of electrodes.
  • the writing electrodes X1 to X6 may overlap the surfaces or projecting parts 12, 13 or be slightly offset on the side thereof.
  • the maintenance discharges are formed in a conventional manner between the projecting parts facing the same pair of electrodes p1 to p6, by a conventional control method, as indicated for example in the documents cited in the preamble. Also the selection of a pixel P1 to P36 is done using addressing signals applied on the one hand to the writing electrodes X1 to X6, and applied on the other hand to the maintenance electrodes of the first family Y1 to Y6; the latter constituting both, in a traditional manner, addressing and maintenance electrodes.
  • the maintenance electrodes E1 to E6 of the second family are used only for maintenance, so that, not having to be individualized, they are, conventionally, all brought to the same instant at the same potential. Consequently, the maintenance electrodes E1 to E6 of the second family can all be electrically connected to one another as shown in FIG. 3, where these maintenance electrodes E1 to E6 are connected to each other on the side of their first end 19, in view of being connected to the output of a maintenance pulse generator (not shown).
  • the electrodes E1 to E6 of the second family are all connected on the side of their first end 19 by the same conductive track 18; but in the spirit of the invention these electrodes E1 to E6 could just as well be joined together at a level closer to that of the maintenance pulse generator or else be connected in the first place two by two (by two electrodes E1, E2 and E3, E4 and E5, E6 adjacent) on the side of their first end 19.
  • the addressing-maintenance electrodes Y1 to Y6 of the first family are connected individually by their end 16 to an addressing and maintenance device (not shown) to which they are connected in a conventional manner; the writing electrodes X1 to X6 also being conventionally connected to addressing means (not shown).
  • the second lateral capacitance c2 (shown in dotted lines), previously mentioned, which is formed between the longitudinal edges 14, 15; these longitudinal edges constituting active edges 14, 15 because it is on these edges that the protruding parts 12, 13 are arranged; then there is the second maintenance electrode E2 of the second family which forms with the second electrode Y2 of the first family the second pair p2 of electrodes. Between the active edges 14, 15 of the second pair p2 of electrodes, the second lateral capacitance c2 is found in the same way as above.
  • the distance d1 between two successive pairs p1 to p6 of electrodes can be significantly reduced compared to the prior art, without risk of increasing the value of the lateral capacities.
  • two electrodes E1 to E6 of the second family and belonging to adjacent pairs p1 to p6, are electrically joined on the side of their second end 20 by a link 21 (shown in dotted lines in the figure ).
  • This characteristic has very important repercussions in terms of manufacturing and particularly reliability. Note that it is simple to connect by a link 21 two electrodes E1 to E6 of the second family, as shown in FIG. 3 where we find joined by a link 21, on the side of their end 20 , the second family electrodes E1 and E2, then E3 and E4, then E5 and E6. Such a connection 21 of the ends 20 of these electrodes E1 to E6 makes it possible to considerably reduce the operating faults due to cuts in these electrodes.
  • the third electrode E3 for example has a cut 24 located at any level between its two ends 19 and 20, the cut electrode portion Ea3 located towards the second end 20, is then supplied through the link 21 and the fourth electrode E4; while in the prior art as a result of such a cut, the entire section of electrodes between the cut 24 and the end 20 is not supplied and does not work, which requires either a long and delicate repair, or the disposal of part of the panel.
  • FIG. 4 schematically shows another version of the invention in which two electrodes E1 to E6 of the second family, which are adjacent are united in a single electrode, while they were separate but connected at their second ends 19, 20 in the example shown in FIG. 3.
  • the first pair of electrodes p1 is formed between the first maintenance electrode Y1 of the first family and the first single electrode E'1 whose active longitudinal edge 15, oriented towards the first electrode Y1 of the first family, comprises the parts projections 13 which are used for maintenance discharges in the same way as in the example shown in FIG. 4.
  • the first single electrode E'1 has, opposite the first active edge 15, a second active edge 25 which replaces the active edge 15 of the second electrode E2 shown in FIG. 4, and which has the same projecting parts 13, so as to constitute with the second electrode Y2 of the first family the second pair of electrodes p2. he the same is true of the second and third single electrodes E'2, E'3 of the second family.
  • the maintenance electrodes of the second so-called unique family E'1, E'2, E'3 are common to two pairs of adjacent maintenance electrodes p1 to p6.
  • An advantage which results from this arrangement lies in a significant simplification of the manufacturing and of the etching operations.
  • Another advantage lies in the fact that it is possible in the case of a single electrode E'1, E'2, E'3 common to two adjacent pairs p1 to p6 of maintenance electrodes, to give a such electrode E'1, E'2, E'3 in the part in particular where it constitutes a conductive track, a width 11 greater than the usual width, greater for example than a second width 12 of an electrode Y1 to Y6 of the first family, so as to increase safety with regard to possible electrode cuts previously mentioned, while occupying a smaller space than that which is necessary to make two tracks of electrodes side by side: d '' where it follows that while increasing the reliability vis-à-vis the cuts, we can decrease the pitch of the pairs p1 to p6 of electrodes and consequently, we can increase the number of lines of pixels and, consequently, increase the resolution of an image.
  • Another advantage of such a structure lies in particular in that it makes it possible to simplify the problems of connection and connection between the electrodes of the second family E'1, E'2, E'3, in particular in the case where these electrodes are connected together outside the face of the panel where they are mounted.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Gas-Filled Discharge Tubes (AREA)
EP89401639A 1988-07-08 1989-06-13 Plasmaanzeigevorrichtung mit koplanarer Auffrischwechselspannung Withdrawn EP0350348A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8809305 1988-07-08
FR8809305A FR2634058A1 (fr) 1988-07-08 1988-07-08 Panneau a plasma a entretien alternatif coplanaire

Publications (1)

Publication Number Publication Date
EP0350348A1 true EP0350348A1 (de) 1990-01-10

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EP89401639A Withdrawn EP0350348A1 (de) 1988-07-08 1989-06-13 Plasmaanzeigevorrichtung mit koplanarer Auffrischwechselspannung

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FR (1) FR2634058A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6229504B1 (en) 1995-11-22 2001-05-08 Orion Electric Co. Ltd. Gas discharge display panel of alternating current with a reverse surface discharge with at least three electrodes and at least two discharge gaps per display color element

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0135382A1 (de) * 1983-08-24 1985-03-27 Fujitsu Limited Gasentladungsanzeigevorrichtung und Verfahren zum Betreiben einer derartigen Vorrichtung
JPS60124330A (ja) * 1983-12-06 1985-07-03 Fujitsu Ltd 面放電型ガス放電パネル
JPS60124329A (ja) * 1983-12-06 1985-07-03 Fujitsu Ltd 面放電型ガス放電パネル

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0135382A1 (de) * 1983-08-24 1985-03-27 Fujitsu Limited Gasentladungsanzeigevorrichtung und Verfahren zum Betreiben einer derartigen Vorrichtung
JPS60124330A (ja) * 1983-12-06 1985-07-03 Fujitsu Ltd 面放電型ガス放電パネル
JPS60124329A (ja) * 1983-12-06 1985-07-03 Fujitsu Ltd 面放電型ガス放電パネル

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 9, no. 280 (E-356)[2003], 8 novembre 1985, page 125 E 356; & JP-A-60 124 329 (FUJITSU K.K.) 03-07-1985 *
PATENT ABSTRACTS OF JAPAN, vol. 9, no. 280 (E-356)[2003], 8 novembre 1985, page 125 E 356; & JP-A-60 124 330 (FUJITSU K.K.) 03-07-1985 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6229504B1 (en) 1995-11-22 2001-05-08 Orion Electric Co. Ltd. Gas discharge display panel of alternating current with a reverse surface discharge with at least three electrodes and at least two discharge gaps per display color element

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