EP0279746A1 - Plasmapaneel mit vier Elektroden pro Elementarbildpunkt und Verfahren zur Steuerung eines solchen Plasmapaneeles - Google Patents

Plasmapaneel mit vier Elektroden pro Elementarbildpunkt und Verfahren zur Steuerung eines solchen Plasmapaneeles Download PDF

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Publication number
EP0279746A1
EP0279746A1 EP88400354A EP88400354A EP0279746A1 EP 0279746 A1 EP0279746 A1 EP 0279746A1 EP 88400354 A EP88400354 A EP 88400354A EP 88400354 A EP88400354 A EP 88400354A EP 0279746 A1 EP0279746 A1 EP 0279746A1
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EP
European Patent Office
Prior art keywords
electrodes
elementary image
parallel
image point
signals
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Granted
Application number
EP88400354A
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English (en)
French (fr)
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EP0279746B1 (de
Inventor
Michel Gay
Louis Delgrange
Michel Specty
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Thales SA
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Thomson CSF SA
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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
    • H01J11/12—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

Definitions

  • the present invention relates to plasma panels of the alternative type. It also relates to methods of controlling these panels.
  • Plasma panels of the alternative type consist, as shown diagrammatically in FIG. 1, of two glass slabs 1 and 2 each carrying a network of electrodes parallel to each other x1, x2 , x3 ..., y1, y2, y3 ..., which are covered with a dielectric layer 3.
  • the two plates are mounted and sealed so that the two arrays of electrodes are perpendicular to each other and that there are a very small distance between the two dielectric layers facing each other 3.
  • This space between the two dielectric layers is filled with a gas, generally based on neon.
  • Each elementary image point is defined by the intersection of two perpendicular electrodes.
  • the information is displayed by repeated ignition of a luminescent discharge within the gas by means of addressing and maintenance signals conveyed by the electrodes.
  • the addressing signals make it possible to create discharges or to eliminate the possibility of subsequent discharges for the elementary points of selected images.
  • the maintenance signals allow the creation of periodic discharges for the elementary points of images which are lit.
  • This plasma panel structure with two electrodes per elementary image point has the advantages of being of simple technological realization, of being robust and of using well-known electrical control circuits.
  • this structure has the following two drawbacks: - the number of electrodes to be connected is large.
  • - the connections to be made and the control circuits of these screens generally represent a higher cost than the panel itself; - It has proved difficult in practice to obtain with plasma panels with two electrodes per elementary image point a color other than the traditional red-orange neon.
  • Each elementary image point is defined by two parallel and coplanar electrodes X and Y and by a Z electrode perpendicular to the other two.
  • the three electrodes X, Y and Z are carried by the same glass slab 1.
  • the dielectric layer 3 isolates the electrodes X and Y from the electrode Z and also covers the electrode Z. Consequently, the glass slab 2 does not carry any electrode and can therefore receive phosphors, emitting by photoluminescence, the or the desired colors.
  • the addressing signals are applied to the crossed electrodes Z and X or Z and Y and the maintenance signals are applied to the parallel electrodes X and Y. Maintenance is therefore carried out by creating lateral discharges between the two electrodes X and Y , parallel and coplanar.
  • European patents 0.0135.382 and 0.157.248 describe methods for controlling the plasma panels shown in FIG. 2. These methods make it possible to reduce the number of control circuits, but in return the number of connections can be increased.
  • the number of control circuits varies between 64 and 1025 and the number of connections varies between 1056 and 1025.
  • control circuits are complex because the same X or Y electrodes are used both for addressing and for maintenance, and while the address signals are weak, service signals are strong.
  • the present invention relates to a new plasma panel structure of the alternative type.
  • the present invention relates to an alternating type plasma panel, comprising a plurality of elementary image points, each point being defined by electrodes perpendicular to each other, connected to circuits supplying in operation address signals and signals.
  • maintenance at each elementary image point characterized in that each elementary image point is defined by three parallel and coplanar electrodes and by an electrode perpendicular to the other three, separated from the other three at least by a dielectric layer, two of the three parallel electrodes being connected to circuits supplying, in operation the maintenance signals, to each elementary image point, while the electrode perpendicular to the other three and that of the three electrodes parallel to each other which is not connected to a circuit supplying the maintenance signals in operation, are connected to circuits supplying in operation the addressing signals to each elementary image point .
  • the invention also relates to methods for controlling such a plasma panel.
  • the addressing and maintenance functions are fulfilled by separate electrodes.
  • the electrodes of the panel which receive the maintenance signals are connected in two networks D and G. Consequently, it is sufficient to apply the maintenance signals of two circuits high power control.
  • one of the three electrodes parallel to each other, the one which carries the addressing signals is common to two neighboring rows of elementary image points, the number of control circuits for addressing the elementary points which are connected to these electrodes can be halved.
  • the invention makes it possible to reduce the cost and the reliability of the control circuits; the reduction in the number of connections, in particular in the two preferred embodiments of the invention mentioned in the preceding paragraph.
  • This reduction does not require any crossing of electrodes and results in a reduction in cost; - the possibility of addressing each elementary image point separately.
  • This is particularly interesting when only part of the information displayed on the panel needs to be modified.
  • the panels according to the invention it is quite possible to address the panel line by line or point by point; - an improvement in luminance, with equal consumption compared to standard panels with two electrodes per elementary image point.
  • each elementary image point is defined by four electrodes, as shown diagrammatically in FIG. 3.
  • FIG. 3 it is shown that an elementary image point is defined on the one hand by three parallel electrodes G, D, X and on the other hand by an electrode Y perpendicular to the other three.
  • the three electrodes G, D, X are located in the same plane, on the same support, which can be one of the two glass slabs 1 or 2 that the panel contains - see for example in FIG. 1 relating to the Prior Art, the two glass slabs which bear the references 1 and 2.
  • the electrode Y is separated from the other three electrodes G, D, X at least by a dielectric layer.
  • the electrode Y is carried by the same glass slab 1 or 2 as the electrodes G, D, X; in this case a dielectric layer not shown in Figure 3, separates the electrodes G, D, X and Y and also covers the electrode or electrodes located towards the inside of the panel.
  • the electrode Y can also be carried by the other glass slab than that which carries the electrodes G, D, X. In this case a layer of dielectric covers the electrode Y and another layer of dielectric covers the electrodes G, D, X. In FIG. 1, these dielectric layers which cover the electrodes have been designated by the reference 3.
  • Two of the three parallel electrodes for example the electrodes G and D are used to convey the maintenance signals. It is therefore a coplanar type interview.
  • the two perpendicular electrodes X and Y are used to convey the addressing signals.
  • the addressing and maintenance functions are fulfilled by separate electrodes, which makes it possible to use electronic circuits well suited to the high power required by the signal signals. Maintenance and at the low power required by the addressing signals allowing the use of high impedance circuits. It is also clear that the plasma panels according to the invention make it possible to address each elementary image point separately, since the addressing of each point is carried out by two given perpendicular electrodes. Addressing can of course also be done line by line.
  • FIG 4 there is shown schematically, that is to say only by its electrodes, a plasma panel according to the invention.
  • the panel in FIG. 4 has four rows and four columns of elementary image points.
  • each elementary image point is defined by four electrodes Y and G, D, X.
  • the electrodes used have been designated by Y1 to Y4, G1 to G4, D1 to D4 and X1 to X4.
  • the electrodes G1 to G4 and D1 to D4 are connected together and create two networks called D and G.
  • the creation of the two networks D and G makes it possible to limit the number of circuits E1 and E2 to two, providing in operation the maintenance signals at each elementary image point, and necessary for the operation of the panel. In addition, the number of panel connections is reduced.
  • the electrodes Y1 to Y4 and X1 to X4 are connected to circuits called A1 to A8 which supply in operation the addressing signals at each elementary image point.
  • FIG. 5a it has been indicated how the different phases 1, 2, 3, 4, 5 which the control of the panel comprises are distributed as a function of time t, plotted on the abscissa.
  • Phase 1 is an initialization phase during which a discharge is created between all the electrodes X i and Y j of the panel so as to conduct charges of a given sign towards each electrode X i . These charges are located in the space corresponding to the intersection of the electrodes X i and Y j . for this, we see in Figures 5a and b that during phase 1, we apply to the electrode Y j a positive voltage pulse of value + V Y and we apply to the electrode X i a negative voltage pulse of value -V X , V Y and V X being positive values. Between the electrodes X i and Y j considered, a sufficient potential difference is created to create a discharge.
  • phase 2 the charges created on the electrode X i are transferred during phase 1 to the electrode D. This is done while maintaining the reference potential taken equal to OV for example, the electrodes Y j and G and by applying to the electrodes X i and D slots of voltage of amplitude successively equal to + V1 and -VH1Y and in phase opposition on the electrodes X i and D.
  • a discharge or an odd number of discharges Each discharge has the effect of reversing the sign of the charges thus transferred to the electrode D. An odd number of discharges leads to an identical and very stable result.
  • Phase 3 is an addressing phase during which it is possible to create a discharge between the electrodes X i and Y j , if it is desired to light a given elementary image point. We therefore carry out a selective addressing of each elementary image point which is also called random addressing.
  • the electrodes D and G are at 0 Volt during phase 3.
  • the electrode Y j receives a pulse of voltage equal to + V Y.
  • the electrode X i it changes to -V X if it is desired to set the elementary image point in question to the on state. If it is desired to extinguish an elementary image point or keep it in the extinguished state, it is sufficient that the two voltages indicated above are not present simultaneously on the two electrodes Y j and X i .
  • phase 3 in the event of the ignition of the elementary image point, there is inversion of the charges stored on the electrode X i .
  • phase 4 there is a succession of discharges between the electrodes X i and D. This is obtained by applying to these electrodes of the voltage slots, in phase opposition, of amplitude successively equal to + V1 and -V2.
  • Phase 5 is a maintenance phase during which the electrodes Y j and X i are at the reference potential, equal to 0 Volt for example and the electrodes D and G receive voltage slots in phase opposition, amplitude successively equal to + V1 and -V2. There is therefore creation of a succession of discharges between the electrodes D and G.
  • Random addressing is used to switch on or off an elementary image point without this modifying the state of the other elementary image points because during phases 1 and 3, signals must be applied to the electrodes X i and Y j .
  • Other non-random addressing is possible with the same structure, for example line-by-line addressing.
  • FIG. 6 represents another embodiment of a panel according to the invention.
  • This panel differs from that of FIG. 4 by the fact that the electrodes X2 and X4 are removed and that the electrodes X1 and X3 connected to the circuits A5 and A7 are common to two columns of elementary points of neighboring images.
  • This embodiment therefore makes it possible to reduce the number of connections and the number of selection circuits, while retaining the possibility of performing random addressing.
  • the panels according to the invention require only n / 2 + 2 connections on one side of the panel and n connections on the other side.
  • FIGS. 7a, b, c, d show an example of the addressing signals Y j , X i , D and G of the panel in FIG. 6.
  • phases 10 to 50 make it possible to address the elementary image points situated to the left of the electrodes X1 and X3.
  • Phases 100 to 500 make it possible to address the elementary points of images situated to the right of the electrodes X1 and X3, and for which the role of the electrodes G and D is reversed with respect to the elementary points of images situated to the left of the electrodes X1 and X3.
  • control signals shown in Figures 7a to d during phases 10, 20, 30, 40, 50 are identical to the control signals shown in Figures 5a to d.
  • the control signals shown in FIGS. 7a to g during phases 100 to 500 differ from those of phases 10 to 50, only as regards the signals applied to the electrodes D and G which have been inverted.
  • This modification corresponds to the position of the electrodes in FIG. 6, where the electrodes X1 and X3 are framed on the left by the electrodes D1 and D3 and on the right by the electrodes G2 and G4.
  • the charge transfer described with regard to phase 2 only occurs between the electrodes X1, X3 and their neighboring electrodes D1 and D3. By cons, this transfer does not occur between the electrodes X1, X3 and the electrodes D2 and D4, because the electrodes G2 and G4 are interposed between the electrodes X1, D2 and X3, D4. Consequently, during phase 30, only the elementary image points situated to the left of the electrodes X1 and X3 can be addressed since the maintenance pulses which took place during phase 20 could only occur between the electrodes D1, X1 and D3, X3.
  • phase 200 there can be maintenance pulses only between the electrodes G2 and X1 and G4 and X3. Consequently, during phase 300 only the elementary image points located to the right of the electrodes X1 and X3 can be addressed.
  • the invention also relates to plasma panels in which, as in FIG. 6, an electrode such as X1, X3 ..., used for addressing, is common to two rows of elementary points of neighboring images, but for which, contrary to what is shown in FIG. 6, the electrodes D1 to D4 and G1 to G4 are not connected according to two networks D and G.
  • FIG 8 there is shown a particular embodiment of a panel according to the invention in which the electrodes G, D, X parallel to each other are no longer in the form of a strip but are crenellated. This shape of the electrodes makes it possible to better locate the discharges corresponding to each elementary image point. It is clear that the discharges remain localized between the portions of electrodes which are closest.
  • FIG. 8 also shows an electrode Z, parallel and coplanar with the electrodes Y, which also serves to locate the discharges at each elementary image point.
  • Z electrodes referred to in the European patent 0.125.382 already cited, are called separation electrodes. They can either be electrically floating or connected to a voltage source.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Control Of Gas Discharge Display Tubes (AREA)
EP88400354A 1987-02-20 1988-02-17 Plasmapaneel mit vier Elektroden pro Elementarbildpunkt und Verfahren zur Steuerung eines solchen Plasmapaneeles Expired - Lifetime EP0279746B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8702205 1987-02-20
FR8702205A FR2611295B1 (fr) 1987-02-20 1987-02-20 Panneau a plasma a quatre electrodes par point elementaire d'image et procede de commande d'un tel panneau a plasma

Publications (2)

Publication Number Publication Date
EP0279746A1 true EP0279746A1 (de) 1988-08-24
EP0279746B1 EP0279746B1 (de) 1990-06-20

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EP88400354A Expired - Lifetime EP0279746B1 (de) 1987-02-20 1988-02-17 Plasmapaneel mit vier Elektroden pro Elementarbildpunkt und Verfahren zur Steuerung eines solchen Plasmapaneeles

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US (1) US4914352A (de)
EP (1) EP0279746B1 (de)
JP (1) JPS63309994A (de)
DE (1) DE3860250D1 (de)
FR (1) FR2611295B1 (de)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2635901B1 (fr) * 1988-08-26 1990-10-12 Thomson Csf Procede de commande ligne par ligne d'un panneau a plasma du type alternatif a entretien coplanaire
FR2635902B1 (fr) * 1988-08-26 1990-10-12 Thomson Csf Procede de commande tres rapide par adressage semi-selectif et adressage selectif d'un panneau a plasma alternatif a entretien coplanaire
US6861803B1 (en) * 1992-01-28 2005-03-01 Fujitsu Limited Full color surface discharge type plasma display device
KR950003132B1 (ko) * 1992-03-26 1995-04-01 삼성전관 주식회사 플라즈마 디스플레이 판넬의 구조 및 구동방법
RU2089966C1 (ru) * 1995-11-22 1997-09-10 Научно-производственная компания "Орион-Плазма" - Совместная акционерная компания закрытого типа Газоразрядная индикаторная панель переменного тока с реверсивным поверхностным разрядом
JP3767644B2 (ja) * 1997-01-21 2006-04-19 株式会社日立プラズマパテントライセンシング プラズマディスプレイ装置およびその駆動方法
RU2120154C1 (ru) * 1997-03-28 1998-10-10 Совместное закрытое акционерное общество "Научно-производственная компания "ОРИОН-ПЛАЗМА" Газоразрядная индикаторная панель переменного тока с поверхностным разрядом и способ управления ею
JP3424587B2 (ja) * 1998-06-18 2003-07-07 富士通株式会社 プラズマディスプレイパネルの駆動方法
US6195073B1 (en) * 1998-08-28 2001-02-27 Acer Display Technology, Inc. Apparatus and method for generating plasma in a plasma display panel
WO2003012765A2 (fr) * 2001-07-30 2003-02-13 'inkotex' Ltd Ecran plasma couleur a courant alternatif et procede de commande associe
JP4325237B2 (ja) * 2003-03-24 2009-09-02 パナソニック株式会社 プラズマディスプレイパネル
JP4580162B2 (ja) * 2003-12-01 2010-11-10 パナソニック株式会社 プラズマディスプレイパネルの駆動方法
JP4856855B2 (ja) * 2004-06-09 2012-01-18 パナソニック株式会社 プラズマ表示装置及びプラズマ表示装置に用いられる駆動方法
TWI352867B (en) * 2007-01-25 2011-11-21 Chunghwa Picture Tubes Ltd Pixel and liquid crystal display panel

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Publication number Priority date Publication date Assignee Title
US3886404A (en) * 1973-02-27 1975-05-27 Mitsubishi Electric Corp Plasma display
EP0135382A1 (de) * 1983-08-24 1985-03-27 Fujitsu Limited Gasentladungsanzeigevorrichtung und Verfahren zum Betreiben einer derartigen Vorrichtung

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54753B2 (de) * 1973-11-19 1979-01-16
US4342993A (en) * 1979-08-09 1982-08-03 Burroughs Corporation Memory display panel

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
US3886404A (en) * 1973-02-27 1975-05-27 Mitsubishi Electric Corp Plasma display
EP0135382A1 (de) * 1983-08-24 1985-03-27 Fujitsu Limited Gasentladungsanzeigevorrichtung und Verfahren zum Betreiben einer derartigen Vorrichtung

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
ELECTRONIC ENGINEERING, vol. 55, no. 681, septembre 1983, pages 165-175, Londres, GB; A. SOBEL: "Gas discharge displays" *
IBM TECHNICAL DISCLOSURE BULLETIN, vol. 25, no. 7B, décembre 1982, pages 3610-3611, New York, US; M.O. ABOELFOTOH: "Cyclic gaseous discharge display panel" *

Also Published As

Publication number Publication date
EP0279746B1 (de) 1990-06-20
DE3860250D1 (de) 1990-07-26
US4914352A (en) 1990-04-03
JPS63309994A (ja) 1988-12-19
FR2611295B1 (fr) 1989-04-07
FR2611295A1 (fr) 1988-08-26

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