EP0376829A1 - Plasma-Panelanzeigevorrichtung mit niedriger Auflösung - Google Patents

Plasma-Panelanzeigevorrichtung mit niedriger Auflösung Download PDF

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Publication number
EP0376829A1
EP0376829A1 EP89403628A EP89403628A EP0376829A1 EP 0376829 A1 EP0376829 A1 EP 0376829A1 EP 89403628 A EP89403628 A EP 89403628A EP 89403628 A EP89403628 A EP 89403628A EP 0376829 A1 EP0376829 A1 EP 0376829A1
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EP
European Patent Office
Prior art keywords
electrodes
cells
maintenance
column
addressing
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Withdrawn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
EP89403628A
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English (en)
French (fr)
Inventor
Michel Gay
Jacques Deschamps
Serge Salavin
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Thales Electron Devices SA
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Thomson Tubes Electroniques
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Filing date
Publication date
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Publication of EP0376829A1 publication Critical patent/EP0376829A1/de
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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 invention relates to a display device using a so-called "low resolution" plasma panel (of the order of a few millimeters for example), which in particular can be read, with good readability, at medium distances (between 1 and 10 meters for example).
  • a display device is called in the following description "display device of the sign type”.
  • Plasma panels are flat screen display devices, now well known, which allow the display of alphanumeric, graphic or other images.
  • Generally plasma panels include two insulating tiles limiting a volume occupied by a gas. These slabs support conductive electrodes, arranged in columns called column electrodes, and electrodes arranged in lines called row electrodes. These column and line electrodes are crossed so as to define a matrix of cells each formed substantially at the intersection of line and column electrodes.
  • the operating principle is the selective generation (that is to say at the level of the selected cells) of electric discharges in the gas.
  • the visualization of the information is ensured by an emission of light which accompanies these discharges and which is located at the level of each cell where an electrical discharge occurs.
  • Each cell can thus constitute an elementary light source whose state can be changed (on or off).
  • plasma panels in particular panels of the continuous operating type, and so-called “alternative" panels in which the electrodes are covered with a layer of dielectric material.
  • One of the advantages of plasma panels of the alternative type is to present a memory effect which makes it possible to address the useful information only to the cell whose state it is desired to change, while the state of the other cells is simply maintained, or maintained (in the case of the lit state) by repetition of alternating electrical discharges called maintenance discharges.
  • each cell of the matrix is formed substantially at the intersection between a column electrode with two parallel maintenance electrodes forming a pair of maintenance electrodes.
  • this type of screen it is known that the maintenance of the discharges, that is to say the repetition of the alternating electrical discharges previously mentioned, is ensured between the two maintenance electrodes of the same pair, and that addressing is done by generation of discharges between two crossed electrodes.
  • FIGS. 1 and 2 Such a plasma panel of the alternative type with coplanar maintenance is shown in FIGS. 1 and 2, in accordance with the teaching of the European patent document EP-A-0135 382. It comprises a glass slab 1, covered with a first and a second family of maintenance electrodes 2 and 3 arranged in lines, parallel and coplanar, and arranged according to an alternation of an electrode 2 of the first family and an electrode 3 of the second family.
  • a succession of an electrode 2 of the first family with an electrode 3 of the second family constitutes a pair of maintenance electrodes used to form the same row of cells.
  • These electrodes are provided with a recess or protruding part 2a and 3a which, in the same pair of maintenance electrodes are oriented towards one another so as to concentrate maintenance discharges between them.
  • the assembly is covered with an insulating layer 4. Addressing electrodes 5 or column electrodes are crossed with the maintenance electrodes 2 and 3; the latter generally being arranged in lines and the addressing electrodes 5 generally being arranged in columns.
  • the assembly is covered with an insulating layer 6 and a protective layer 7 made of 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 address discharge is selectively generated at the intersection of a column electrode 5 with a line electrode 2 of a given pair of electrodes maintenance (in a pair of maintenance electrodes, the line 2 electrode performs an addressing function and a maintenance function). This addressing 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 charges between the two electrodes of each pair. Maintenance discharges are those which provide most of the useful light; they are maintained using voltage slots, which are applied between the two electrodes of each pair of maintenance electrodes, and which succeed each other with opposite polarities.
  • Such a solution for plasma panels of the "sign" type is relatively satisfactory because it facilitates manufacturing and reduces costs, in particular because, compared to high resolution panels, the electrodes can be further apart from one another. , and that the width of these electrodes can be increased; it can also be noted that this last point can also have a favorable consequence insofar as it tends to reduce the number of electrodes or conductors cut.
  • a display device comprising, a display surface formed by a plasma panel, means for controlling and addressing the plasma panel, the display surface being shared at a plurality of elementary points of images, the plasma panel comprising cells arranged in lines and in columns, the cells being formed by conductors in crossed lines with conductors in columns, is characterized in that at least one elementary point of image is formed from a group of cells comprising at least two contiguous cells
  • each group of cells corresponds to an elementary image point of a lower resolution display device.
  • the grouping of discharges or grouping of cells forming an elementary image point can be achieved by adapting the control and addressing method so as to control simultaneously for all the cells of the same group, namely the extinction, either ignition or maintenance discharges.
  • the method to be used to carry out these commands can easily be deduced for the specialist in the control methods described in the documents cited above.
  • the grouping of cells to form an elementary image point is obtained by a "hardware link", that is to say by electrically connecting at least two contiguous column electrodes and / or to the at least two contiguous line electrodes or by connecting the conductors which lead to these electrodes; this can be done both inside the plasma panel itself and outside of it, that is to say at any level between the areas which constitute the cells and the outputs of the addressing and control means.
  • FIG. 3 schematically shows a display device 10 by plasma panel, according to the invention.
  • the plasma panel 12 is of the type with two crossed electrodes to form a cell, and of the alternative type for example.
  • the display device 10 comprises: addressing and control means constituted by a column addressing and control device 13, and by a line 14 addressing and control device;
  • the plasma panel 12 comprises electrodes arranged in columns X1, X2, ..., X6 called column electrodes, and row electrodes Y1, Y2, ..., Y6 called row electrodes and which are perpendicular to the column electrodes X1 to X6.
  • the plasma panel 12 is mainly represented by the electrodes X1 to X6 and Y1 to Y6, but of course these two types of electrodes are mounted on two slabs (not shown in the figure) as was previously explained in the preamble in reference to FIGS. 1 and 2. These two tiles are sealed to each other by a joint (not shown) so as to define an active part 16 containing the ionizable gas of the plasma panel 12; this active part 16 represents a display surface SA which is divided into elementary image surfaces or points PI1, PI2, PI3, PI4.
  • the row electrodes Y1 to Y6 can for example be located in a deeper plane than that which contains the column electrodes X1 to X6, the latter being carried by the slab located on the side by which one looks at the plasma panel 12, the row electrodes Y1 to Y6 being carried by the other slab.
  • the slabs have an overhanging part 17, that is to say beyond the active part 16.
  • the column and row electrodes X1 to X6 and Y1 to Y6 are extended on the overhanging part 17 , and therefore the outside of the active part 16, by conductors 18, 19, 23, 31, 32, 33 which connect these electrodes to the addressing and control devices 13, 14 by means of connection element 15, 24 , 27 and connecting wires F1, F2 of a first cable 11X and connecting wires F3, F4 of a second cable 11Y.
  • At least two column electrodes X1 to X6 consecutive or adjacent and / or at least two row electrodes Y1 to Y6 consecutive or adjacent are electrically connected to each other in a physical manner, that is to say physically connected to each other.
  • this hardware connection is made in the active part 16 of the plasma panel 12.
  • the first three column electrodes X1, X2, X3 are electrically connected to each other in the active part 16, using a connecting conductor 26 located on the side of their first end 21 (this first end being that which is oriented towards the extension conductors 18, 19); the fourth, fifth and sixth column electrodes X4, X5, X6 are connected in the same way by a connecting conductor 26.
  • the first three column electrodes X1, X2, X3 are extended by a single conductor 18 which connects these electrodes to a column control output SC1 of the column addressing device 13, via the connection element 15 and a wire F1 of the cable 11X; whereas in the prior art three column electrodes, even contiguous, are connected to three different control outputs. It is the same for the fourth, fifth and sixth column electrodes X4, X5, X6 which are extended by a single conductor 19 itself connected to a control output SC2, via a second wire F2 of the cable 11X.
  • the first three line electrodes Y1, Y2, Y3 are also connected to each other by a connecting conductor 20 in the active part 16, on the side of their first end 29 oriented towards the connection elements 24, 27.
  • the three line electrodes Y1 to Y3 are extended by a single conductor 23, and are connected by this single conductor 23 to an output SL1 of the line addressing device 14, via the connection elements 24, 27 and a wire F3 of the second 11Y cable.
  • Groups GX1, GX2 of column electrodes and groups GL1, GL2 of row electrodes are thus produced, in which the electrodes of the same group are connected together; from which it follows that groups of cells GC1, GC2, GC3, GC4 are each produced corresponding to an elementary point of image PI1 to PI4.
  • the first three column electrodes X1, X2, X3 are addressed by an address and control signal VX (the address and control signals d column electrodes are generally constituted by sets of cyclic voltage pulses, not shown, in themselves well known), and which are addressed on the other hand the first three electrodes Y1, Y2, Y3, by a VL line addressing and command signal (VL line command and addressing signals also generally consist of sets of cyclic voltage pulses, in themselves well known, whose phase is correlated to the phase of VX signals applied to the column electrodes), the cells C1, C2, C3, C7, C8, C9, C13, C14, C15, that is to say, generate discharges in the area of these cells; these discharges 25 are symbolized in the figure by point clouds.
  • VX address and control signals
  • VL line command and addressing signals also generally consist of sets of cyclic voltage pulses, in themselves well known, whose phase is correlated to the phase of VX signals applied to the column electrodes
  • the grouping of these discharges 25 tends to constitute a single light spot contained in the surface of the first elementary point PI1; this light spot is relatively homogeneous insofar as the distance d1 between two row electrodes connected together and the distance d2 between two connected column electrodes together is sufficiently weak so that the edges of these discharges merge; each discharge 25 being of course substantially centered around the crossing surface Sc which represents the cell.
  • a group GC1 of cells formed from contiguous cells and controlled simultaneously in the same way is thus put in the "on" state, and it is possible to control the others in a similar manner.
  • groups GC2, GC3, GC4 in such a way that they each define an elementary image point whose surface contains all the discharges which are generated in such a group of cells GC1 to GC4.
  • the desired effect is to group at least two cells C1 to C36 to increase the area of an elementary image point PI1 to PI4 starting from a plasma panel 12 whose cells C1 to C36 have a surface Sc crossing much less than the desired area of the elementary image point.
  • the row or column electrodes can be connected together outside of the active part 16 of the panel 2.
  • each of these electrodes is extended outside of the active part 16, by a conductor 31, 32, 33, these conductors respectively leading to contact pads 31a, 32a, 33a of the connection element 24 which is integral with the panel 12; so that in this conflguration, it is possible to make no modification to the plasma panel 12 itself whatever its use, either that it is used in cases where a high image resolution is required, or that 'it is used to form a display device of the "sign" type.
  • the line electrodes Y4, Y5, Y6 can be connected to each other between the connection element 24 and a line control output SL2 (of the line addressing and control device 14) to which these line electrodes must be connected.
  • the hardware connection between these three electrodes Y4, Y5, Y6 can take place at the level of the line addressing and control device 14, or, as in the nonlimiting example represented in FIG. 3, by a connecting wire 40 which joins the contact pads 31a, 32a, 33a via pads 31b, 32b, 33b, contained in a connection element 27 attached to the second connecting cable 11Y; it is thus possible to use a single wire F4 to connect these three pads to the output SL2.
  • the electrodes of the same group are interconnected at their two ends, and there is a self-healing effect of the cuts.
  • the group GL1 formed by the first, second and third row electrodes Y1, Y2, Y3 there can be both a cut 42 towards the middle of the first electrode Y1, and a cut 43 towards the middle of the second electrode Y2, without compromising the operation of any of the cells produced using these electrodes, owing to the fact that the two line electrodes Y1, Y2 remain supplied by their two ends 20, 34 thanks to the presence of the third line electrode Y3.
  • This version of the invention is also applicable in the case of alternative plasma panels with coplanar maintenance.
  • FIG. 4 illustrates the application of the invention to a display device 10 using a plasma panel 12a of the alternative type with coplanar maintenance.
  • the plasma panel 12a is mainly represented by column electrodes X1 to X4 and by electrodes arranged in line.
  • the electrodes arranged in line are constituted, in a manner which is in itself conventional, in pairs of maintenance electrodes P1 to P6; the column electrodes X1 to X4 and the pairs of electrodes P1 to P6 being limited respectively to the number of 4 and to the number of 6 to simplify the description and for greater clarity in FIG. 4.
  • the pairs of electrodes P1 to P6 are crossed with the column electrodes X1 to X4, and the intersections of these crossed electrodes form cells C′1 to C′24 materialized in the figure by hatched surfaces in solid lines. It is known that generally, in plasma panels of the alternative type with coplanar maintenance with three electrodes to define a cell, one or more cells are addressed for recording (switching on) or erasing (switching off) by discharges carried out. between the column electrode X1 to X4, which has only an addressing function, and only one of the two electrodes which constitute a pair P1 to P6 of maintenance electrodes; and, between the two electrodes of the same pair, the maintenance discharges which constitute the main part of the light emitted by the cells are produced.
  • each pair P1 to P6 of maintenance electrodes each have, at each cell C′1 to C′24, a projecting surface 50, 51, that is to say say a surface or part in excess with respect to the longitudinal edges of these electrodes.
  • Each pair of electrodes P1 to P6 comprises a first electrode YA1 to YA6 called the addressing-maintenance electrode which provides an addressing function and a maintenance function, and comprises a second electrode E1 to E6 which only performs the function d 'interview ; so that these maintenance-only electrodes E1 to E6 do not have to be individualized, and in Consequently, they can be connected as shown in FIG. 4, to the same output 47 of a maintenance pulse generator 45 delivering in the conventional manner cyclic maintenance voltage pulses VE (not shown).
  • the address-maintenance electrodes YA1 to YA6 are each connected to a different output of a line addressing and control device, and the same is true for the column electrodes which are each connected to a different output from a column addressing and control device.
  • at least two adjacent or consecutive addressing-maintenance electrodes YA1 to YA6 and / or two adjacent column electrodes X1 to X4 are connected to the same output of the addressing and command line and column 14, 13, so as to produce at least one group of cells, the grouping of at least two adjacent cells C′1 to C′24 serving to define an elementary image point, as it has already been explained with reference to FIG. 3.
  • the 24 cells C′1 to C ′24 form four groups G′C1 to G′C4, each group G′C1 to G′C4 defining an elementary image point PI1, PI4.
  • the first two adjacent electrodes X1, X2 are connected together and then connected to a first output S′C1 of the column addressing and control device 13; and on the other hand, the third and fourth column electrodes X3, X4 which are adjacent are also connected together, then connected to a second output S′C2 of the column addressing device 13.
  • the address-maintenance electrodes YA1 to YA3 of the first three pairs P1 to P3 are linked together and forming a group of electrodes G′L1, then connected to an output S′L1 of the line addressing device 14; and on the other hand, the three other addressing-maintenance electrodes YA4, YA5, YA6 are connected together and form a group of electrodes G′L2, then they are connected by a single conductor to the second output S′L2 of the line addressing device 14.
  • the discharges 25 ′ (represented by point clouds) obtained at the level of each cell extend a little beyond the length L1 of the projecting surfaces 50, 51, so that these discharges 25 ′ have a longer elongated shape parallel to the pairs P1 to P6 of electrodes; on the other hand, for two discharges 25 ′ produced by neighboring cells belonging to the same pair of electrodes, for example cells C′1, C′2 formed with the first pair of electrodes P1, it is observed that these discharges 25 ′ Tend to merge at their ends so as to form substantially only a single light spot, which tends to increase homogeneity, despite the fact that the column electrodes X1, X2, whose width L2 is relatively weak, are interposed between an observer and its light zones.
  • FIG. 4 shows another arrangement which illustrates an important advantage brought by the realization of "material connections" inside the plasma panel itself, c that is to say in the active part 16 shown in FIG. 3.
  • the electrodes YA1 to YA6 and E1 to E6 arranged in line are connected together in the active part 16 (not shown in FIG. 4), they can be arranged in a different succession as shown in FIG.
  • the facing electrodes are both electrodes of the addressing-maintenance type, so that not only can these electrodes be connected on the side of their first end 60, but that they can also be connected together on the side of their second end 61; from which there results a self-repair of possible cuts, as has been explained with reference to FIG. 3. It is even possible in such a case, to make these two address-maintenance electrodes YA1 to YA2 in a single conductor, this that is to say, fill the space 63 between these two electrodes with electrically conductive material.
  • FIG. 5 illustrates a version of the invention which allows in particular to obtain an adjustment of the general level of luminance of the panel.
  • Figure 5 shows only line electrodes and column electrodes intended to form a single elementary image point.
  • a first and a second line electrode Y1, Y2 are shown, connected together and intended to be connected, as has been explained above, to an output of an addressing device and of line command (not shown).
  • row electrodes Y1, Y2 are crossed with a first and a second column electrodes X1, X2 which are connected together and which are intended to be connected to the same output of a column addressing and control device (not shown) .
  • first row electrode Y1 and the first column electrode X1 have the same width L3; the second column electrode X2 and the second row electrode Y2 have the same width L4 greater than the width L3 of the first row and column electrodes Y1, X1.
  • the fourth cell Ca4 has a crossing surface SC4 larger than the first, second and third crossing surfaces SC1, SC2, SC3; the second and third cells Ca2, Ca3 have crossing surfaces SC2, SC3 equal to and greater than the crossing surface SC1 of the first cell Ca1.
  • the potential differences which are generated by the voltage pulses applied to these electrodes Y1, Y2 and X1, X2 may have an amplitude just sufficient to generate a discharge between the second electrode X2 and the second line electrode Y2, at the level of the fourth Ca4 cell which has the largest crossing surface SC4, and which therefore requires the smallest potential difference; the amplitude of this potential difference being at the same time insufficient to generate a discharge at the level of the first, second and third cells whose surfaces SC1, SC2, SC3 are smaller.
  • This difference in potential can also be increased so that its amplitude is sufficient to generate discharges at the level of the fourth, third and second cells Ca4, Ca3, Ca2, and is insufficient to generate discharges at the level of the first cell Ca1.
  • the amplitude of the highest potential difference makes it possible to obtain discharges at the level of the four cells simultaneously.
  • one or more of these cells can be given surfaces or geometries or shapes different from the other cells of this same group, so that one can in particular selectively creating certain discharges within the same group of cells, with a view in particular to adjusting the general level of luminance of the display screen, that is to say of the plasma panel.
  • protruding surfaces of the addressing electrodes YA1 to YA6 it is also possible to intervene on the shape and dimensions of the protruding surfaces of the addressing electrodes YA1 to YA6, for example by conferring different surfaces on some of the protruding surfaces 50, 51 of the addressing-maintenance electrodes (pairs P1 to P6), interconnected and which are crossed by the same column conductor X1 to X4 or by different column conductors but connected to each other.

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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)
EP89403628A 1988-12-30 1989-12-22 Plasma-Panelanzeigevorrichtung mit niedriger Auflösung Withdrawn EP0376829A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8817491A FR2641413B1 (fr) 1988-12-30 1988-12-30 Dispositif d'affichage par panneau a plasma de faible resolution
FR8817491 1988-12-30

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EP0376829A1 true EP0376829A1 (de) 1990-07-04

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003012765A3 (en) * 2001-07-30 2003-03-20 Inkotex Ltd Alternating current colour plasma panel and method for controlling said panel

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3704389A (en) * 1970-06-24 1972-11-28 Teletype Corp Method and apparatus for memory and display
EP0135382A1 (de) * 1983-08-24 1985-03-27 Fujitsu Limited Gasentladungsanzeigevorrichtung und Verfahren zum Betreiben einer derartigen Vorrichtung

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3704389A (en) * 1970-06-24 1972-11-28 Teletype Corp Method and apparatus for memory and 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
IBM TECHNICAL DISCLOSURE BULLETIN, vol. 23, no. 10, mars 1981, pages 4536-4537, New York, US; M.O. ABOELFOTOH: "Structure to reduce glow spreading in DC panel" *
IEEE TRANSACTIONS ON ELECTRON DEVICES, vol. ED-33, no. 8, août 1986, pages 1169-1173, IEEE, New York, US; G.W. DICK: "Three-electrode-per-pel AC plasma display panel" *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003012765A3 (en) * 2001-07-30 2003-03-20 Inkotex Ltd Alternating current colour plasma panel and method for controlling said panel

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FR2641413B1 (fr) 1991-02-15
FR2641413A1 (fr) 1990-07-06

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