EP0361992B1 - Plasma-Anzeigeplatte mit modifizierter Adressierbarkeit - Google Patents

Plasma-Anzeigeplatte mit modifizierter Adressierbarkeit Download PDF

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Publication number
EP0361992B1
EP0361992B1 EP89402284A EP89402284A EP0361992B1 EP 0361992 B1 EP0361992 B1 EP 0361992B1 EP 89402284 A EP89402284 A EP 89402284A EP 89402284 A EP89402284 A EP 89402284A EP 0361992 B1 EP0361992 B1 EP 0361992B1
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Prior art keywords
electrodes
addressing
line
pixels
column
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EP89402284A
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English (en)
French (fr)
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EP0361992A1 (de
Inventor
Michel Gay
Jacques Deschamps
Serge Salavin
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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
    • 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

  • the present invention relates to a plasma panel according to the first part of claim 1, the electrodes of which are arranged in a new way, so as to make it possible in particular to increase the speed of obtaining the images displayed by this panel.
  • Plasma panels have flat screen display devices, now well known, which allow the display of alphanumeric, graphic or other images, in color or not.
  • Generally plasma panels include two insulating tiles limiting a volume occupied by a gas (generally a mixture based on neon). These slabs support conductive electrodes arranged in columns called column electrodes, and electrodes arranged in lines called row electrodes. These column and row electrodes are crossed so as to define a matrix of cells each forming an elementary image or pixel point.
  • the operating principle is the selective generation (at the intersection of row and column electrodes, i.e. at the level of selected pixels) of electrical discharges in the gas. The visualization of the information is ensured by an emission of light which accompanies these discharges.
  • Some plasma panels operate continuously, but it is more often preferred to use panels of the so-called “alternative” type, the operation of which is based on an excitation in alternating conditions of the electrodes.
  • the electrodes are covered with a layer of dielectric material, and they are no longer in direct contact with the gas or with the discharge.
  • One of the advantages of this type of “alternative” plasma panel is that it presents a memory effect which allows useful information to be addressed only to the pixels whose state one wishes to change (on or off); on the other elementary points of images or pixels, the state of these latter is simply maintained by repeating discharges alternating electrics, called maintenance discharges, which are obtained only for pixels which are in the on state, that is to say registered.
  • control of the pixels can consist of point-to-point addressing, that is to say pixel by pixel, so that the duration of addressing time which limits the rate of refreshment of the information, does not in general is not a problem.
  • each pixel of the matrix is formed by three electrodes, more precisely at the intersection between a column electrode with two parallel maintenance electrodes forming a pair of maintenance electrodes.
  • 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 the addressing is by generation of discharge between two crossed electrodes.
  • the column electrode in this case has only an addressing function, and among the two electrodes of the same pair of electrodes, one has only a maintenance function and the other provides a maintenance function and an addressing function.
  • a plasma panel of the alternative type with coplanar maintenance, with three electrodes per pixel, is known in particular from the European patent document EP-A-0135 382, which describes also a method for controlling this screen.
  • the maintenance electrodes may include, at each pixel, a protrusion or protruding surface: in the same pair of maintenance electrodes, the protruding surfaces of one electrode are oriented towards those of the other electrode, the discharges between these protruding surfaces.
  • MO ABOELFOTOH this article describes crossed electrodes whose surfaces are widened at the level of the crossings in order to reduce the priming voltages and locate the discharges.
  • the column electrodes are individualized so that it is possible to select only one of them, that is to say that they are each connected to a particular output of '' a control and addressing device.
  • the line electrodes in the case where a pixel is defined at the intersection of a column electrode and a single line electrode (both for plasma panels of the continuous type and of the alternative type); and with regard to the plasma panels with coplanar maintenance, among the maintenance electrodes, those which ensure the maintenance function of the discharges and the addressing function (addressing-maintenance electrodes) are also all individualized.
  • the information refresh rate is generally not a problem when the control method used is of the point-to-point addressing type.
  • the time required to form an image depends on the number of pixels and on the overall time required for addressing operations (erasing addressing and / or writing addressing) and maintenance.
  • the known method consists in controlling the pixels by an addressing of semi-selective type (which is generally a command either of erasing, either of registration, of all the pixels of a given line), followed by a selective type addressing (in which one or more selected pixels of this line are controlled to be brought to the state opposite to that to which they were carried by semi-selective addressing).
  • semi-selective type which is generally a command either of erasing, either of registration, of all the pixels of a given line
  • selective type addressing in which one or more selected pixels of this line are controlled to be brought to the state opposite to that to which they were carried by semi-selective addressing.
  • the renewal of images in the case of dynamic images or with gray tint must be ensured at least 50 times per second (frame time less than 20 milliseconds) , so that the number of lines entered per frame can hardly exceed a thousand.
  • the image is formed of only 512 lines for example, and that the image is renewed 50 times per second, it is possible to obtain four shades of gray taking into account the method used for the control of these shades of gray. Or even with images of only 256 lines, these 256 lines can be written each four times per second, which leads to 16 levels of luminance or shades of gray for each image point, and an image limited to only 128 lines would achieve 64 levels of luminance; whereas however it would be desirable to obtain for example 128 levels of luminance or shades of gray for images of 512 lines.
  • the current state of the art does not allow a sufficient increase in the speed of addressing line by line, either in order to obtain a sufficient number of half tones as described above, or even in view of other results such as for example increasing the number of lines that make up an image.
  • the present invention relates to a plasma panel, both of the continuous type and of the alternative type with coplanar maintenance or not, whose new arrangement, particularly at the electrodes, makes it possible to reduce considerably compared to a plasma panel.
  • the prior art the time required for addressing all the lines which constitute an image, for the same number of pixels per line.
  • This new arrangement of electrodes makes it possible in particular to carry out the simultaneous addressing of several lines of pixels both for the semi-selective addressing phase and for the selective addressing phase.
  • the new arrangement proposed by the present invention makes it possible to overcome this latter difficulty in a simple manner, and it can be seen that the drawbacks brought by this new arrangement are more than offset by the advantages which it provides with regard to the speed d image.
  • a plasma panel comprising, pixels arranged in rows and columns, crossed column electrodes with row electrodes and defining a plurality of crossings, a column control and addressing device to which the column electrodes are connected, a line control and addressing device to which the line electrodes are connected, each crossing comprising a crossing surface formed by the surfaces in sight of the row electrode and the corresponding column electrode, characterized in that the crossings consist on the one hand of simple crossings, and on the other hand of widened crossings having a crossover surface larger than that of the simple crossings, each pixel being defined substantially at the level of a widened crossover in that at least two line electrodes are connected to the same output of the line control and addressing device the number M of column electrodes being greater than the number N of the pixels contained in a line formed using a line electrode belonging to a group of electrodes.
  • the authors of the invention have found that the voltages necessary between the electrodes to obtain the initiation and the maintenance of electrical discharges at the pixel level depend on the crossing surfaces: smaller crossing surfaces require higher voltages and vice versa . So that the voltage applied between the electrodes can be sufficient to cause electrical discharges at the crossings having a sufficient given crossing surface (enlarged crossing where the pixels are made up), and this voltage may be insufficient to cause discharges at the level other crosses with a smaller surface.
  • FIG. 1 shows a plasma panel which is mainly represented by electrodes arranged in columns X1, X2, ..., X8 called column electrodes, and row electrodes Y1 to Y4 perpendicular to the column electrodes X1 to X8; the column electrodes X1 to X8 being shown in a plane deeper than the plane in which the line electrodes Y1 to Y4 are located.
  • the column electrodes X1 to X8 are each connected to a different output SX1 to SX8 of a first addressing device or control and addressing device column 2, and the row electrodes Y1 to Y4 are connected to a second device addressing or line 3 command and addressing device.
  • the line electrodes Y1 to Y4 are made up of groups G1, G2 each connected to a different output SG1, SG2 of the line 3 command and addressing device.
  • at least one group d 'at least 2 lines Y1 to Y4 is thus formed, but in practice one might think that it is simpler to form a plurality of groups each comprising the same number N at least equal to 2 of line electrodes.
  • these line electrodes are formed in two groups G1, G2: the first group G1 comprising the first and second line electrodes Y1, Y2, and the second group G2 comprising the third and fourth line electrodes Y3, Y4; the two electrodes Y1, Y2 of the first group G1 are connected to the same output SG1 of the control and addressing device line 3, the second output SG2 of which is connected to the two electrodes Y3, Y4 of the second group G2.
  • the line electrodes Y1, Y2 of the first group G1 correspond to the same address and are therefore addressable simultaneously, and the line electrodes Y3, Y4 of the second group G2 are at a second same address and are therefore addressable simultaneously; so that in a way the first and the second line electrode Y1, Y2 of the first group G1 constitute a single line electrode G1 having at least two branches Y1 and Y2, and the second group G2 constitutes a second single line electrode having two branches Y3 and Y4.
  • each of the column electrodes X1 to X8 form a crossing with each of the groups G1, G2 at as many points as there are branches or line electrodes Y1 to Y4 belonging to this group: thus for example, considering the first column electrode X1, the latter crosses the first group G1 at the level of the first line electrode Y1 and at the level of the second line electrode Y2; the first column electrode X1 then crosses the second group G2 at the third row electrode Y3 and then at the fourth row electrode Y4; and the same is true for the other column electrodes X2 to X8.
  • the crossing or intersection intended to define a pixel is given a crossing surface Sc (represented in the figure by hatching) larger than the surface of crossing or intersection surface St (represented by hatching) of a simple crossing Cs, that is to say of a crossing not intended to define a pixel; the crossing surface and the intersection surfaces Sc, St are defined by a surface facing the row electrodes Y1 to Y4 and the column electrodes X1 to X8 which form these crossings.
  • the row electrodes Y3, Y4 of the second group G2 determine at their crossing with the column electrodes X1 to X8 pixels PX9 to PX12 for the third row electrode Y3 and pixels PX13 to PX16 for the fourth row electrode Y4.
  • the crossing surfaces Sc (at the pixels PX1 to PX16) can be made larger than the intersection surfaces St that the simple crossings Cs have, for example by widening either of the column electrodes X1 to X8 as shown in the figure 1, either by widening the line electrode Y1 to Y4 or even by widening these two electrodes.
  • the crossing surface Sc which defines the first pixel PX1 (this example also being valid for the other crossing surfaces)
  • the first column electrode X1 has at this level a width l1 greater than the width l2 that it comprises at a simple crossing Cs where this column electrode constitutes only a conductor.
  • the potential differences developed between column electrodes X1 to X8 and row electrodes Y1 to Y4, during the conventional phases of semi-selective addressing, selective addressing and maintenance, can be adjusted so that , given the increase in the crossing surface Sc at the pixels PX1 to PX16, these potential differences are sufficient to generate the electrical discharges at the pixels, and insufficient to generate the discharges at the simple crossings Cs ; these potential differences being generated for example in a manner known per se, by voltage pulses (not shown), which are applied to these electrodes (X1 to X8 and Y1 to Y4) by the control and addressing devices row and column 3, 2, these having a common reference potential, mass for example; the amplitude of these pulses determining the values of the voltages VY applied to the row electrodes Y1 to Y4 and the values of the voltages VX applied to the column electrodes X1 to X8.
  • the pixels PX1 to PX4 formed with the first row electrode Y1 constitute a first row of pixels L1 which belongs to the first group G1, as do the pixels PX5 to PX8 which are formed with the second row electrode Y2 and which constitute a second row of L2 pixels;
  • the pixels PX9 to PX12 which are formed using the third line electrode Y3 form a third line of pixels L3 which belongs to the second group G2, as are the pixels PX13 to PX16 formed by the fourth line electrode Y3 and which constitute a fourth row of pixels L4.
  • the first group G1 that is to say simultaneously the first and the second line electrodes Y1 and Y2
  • simultaneously the first, second, sixth and eighth column electrodes X1, X2, X6 and X8 it is possible to selectively either erase or write simultaneously the first pixel PX1 which belongs to the first line L1 and the fifth, seventh and eighth pixels PX5, PX7 and PX8 which belong to the second row of pixels L2.
  • each group G1, G2 comprises only 2 row electrodes Y1, Y2 and Y3, Y4, but of course each group G1, G2 could consist of a greater number n d 'lines electrodes Y1 to Y4; thus the number of line addresses (which corresponds to the number of groups G1, G2) would be smaller compared to the total number of line electrodes Y1 to Y4, so that the number of line electrodes can be addressed simultaneously and consequently the number of lines L1 to L4 of pixels whose pixels PX1 to PX16 can be selectively controlled simultaneously.
  • this increase in the number of lines L1 to L4 addressable simultaneously requires an increase in the number of column electrodes X1 to X8.
  • 4 row electrodes and 4 column electrodes are sufficient: on the other hand with the present invention, if 4 row electrodes are divided into two groups G1, G2, each having a number n of two line electrodes connected to the same output of the line 3 command and addressing device, the number of line addresses is divided by the ratio of the total number of line electrodes to the number of groups (i.e. by 2 in the example), and the number of column electrodes must be increased in the same ratio; that is, if each group G1, G2 had 4 line electrodes, it would be necessary to use 16 column electrodes to form 16 pixels.
  • the column electrodes X1 to X8 are rectilinear, and for a given column electrode it is necessary that at one level or at another, a pixel is separated from a next pixel by a simple crossing Cs; thus for example, in the nonlimiting example described, the first pixel pX1 is separated from the next pixel PX9 by a simple crossing Cs formed with the second row electrode Y2, which constitutes a neighboring pixel PX5 with a neighboring column electrode X2, so that in this arrangement the pixels PX1 to PX16 appear placed in a staggered fashion.
  • a first column of pixels C1 is made up of the first and ninth pixels
  • a second column of pixels C2 is made up of the fifth and thirteenth pixels PX5, PX13
  • a third column C3 is made up of the second and tenth pixels PX2, PX10 and so on up to an eighth column of pixels C8 which includes the eighth and sixteenth pixels PX8, PX16; these columns of pixels being symbolized in the figure by dashed lines.
  • These pixels are offset from a line electrode to a next line electrode by a distance which corresponds to the pitch P along which the column electrodes X1 to X8 are arranged.
  • a cut 10 of a line electrode is self-repairing: indeed, in this case, the power supply of the pixels PX6, PX7, PX8 located on the section Y2 'arranged opposite the first end 5, Relative to the cut 10, is provided by the first line electrode Y1 and by connecting conductors 12 which connect these two line electrodes Y1, Y2.
  • FIG. 2 represents a matrix 1 according to the invention in which each crossing between a column of pixels and a row electrode Y1 to Y4 constitutes a pixel, so that the pixels PX1 to PX16 are no longer distributed in staggered rows as in example of figure 1.
  • the plasma panel 1 comprises row electrodes Y1, Y2, Y3, Y4 arranged in the same manner as in the example in FIG. 1, and also comprises 8 column electrodes x1 to X8 allowing to make 16 pixels PX1 to PX16.
  • the column electrodes X1 to X8 are not rectilinear but comprise a plurality of baffles 15 or turns so as to allow alignment on the same column of pixels Ca, Cb, Cc, Cd of pixels PX1 to PX16 formed by neighboring column electrodes X1 to X8 (in the nonlimiting example described, 2 neighboring column electrodes).
  • the baffles of the column electrodes X1 to X8 which are used to define the same column of pixels, have a complementary shape, but of course these baffles can have a shape different from that shown in FIG. 2 and different from each other.
  • the first column electrode X1 crosses the first row electrode Y1, so as to constitute the first pixel P1 which is substantially centered on the line representing the first column of pixels Ca; the first column electrode X1 then becomes parallel to the line electrodes so as to constitute a first spacer baffle 15 and release the intersection with the second line electrode Y2 and the first column of pixels Ca, intersection at which the fifth pixel PX5 is located formed by the passage of the second column electrode X2; which second column electrode X2 comprises a return baffle 16 which makes it possible to place it on the column Ca.
  • the intersection between a straight section T of the first column electrode X1 and the second row electrode Y2 constitutes a simple crossing Cs located outside the column Ca, and after this simple crossing, the first column electrode X1 comprises a return baffle 16 which brings it back to the column Ca of pixels so that, when it collols with the third row electrode Y3, it forms the ninth pixel PX9; of course the second column electrode X2 has a spacer baffle 15 which allows it to move away from the column Ca of pixels to make room for the first column electrode X1. As shown in FIG.
  • the turns or baffles 15, 16 are formed by changes of direction of the column electrodes X1 to X8 which operate in directions perpendicular and / or parallel to the line electrodes Y1 to Y4 and columns Ca to Cd of pixels, but these turns could also be made by oblique directions, as illustrated for example by lines 17 in dotted lines at the level of the seventh pixel PX7 formed between the sixth column electrode X6 and the second row electrode Y2.
  • FIG. 3 shows a plasma panel according to the invention, and illustrates how to simplify the column electrodes so as to reduce the number of baffles 15, 16 or turns for the same arrangement of the pixels as in the example of FIG. 2.
  • FIG. 3 shows three groups G1, G2, G3 connected to an output SG1, SG2, SG3 of the line 3 command and addressing device; each group comprising two line electrodes Y1 and Y2, Y3 and Y4, Y5 and Y6 respectively, according to an arrangement similar to that previously described; 6 column electrodes X1 to X6 are shown assembled two by two so that the pixels formed by two column electrodes are arranged in the same column of pixels.
  • each line electrode Y1 to Y6 three simple crosses Cs and three pixels are formed, that is to say in all 18 pixels PX1 to PX18 in the example, at the rate of three pixels per line L1 to L6 and six pixels by columns Ca, Cb, Cc.
  • the latter is aligned on the line which represents the first column Ca of pixels: it crosses the first row electrode Y1 so as to constitute the first pixel PX1 then departs from the first column Ca with a spacer baffle 15 and then becomes perpendicular to the line electrodes in order to cross, according to simple crossings Cs, the second and third line electrodes Y2, Y3; then, a return baffle 16 brings it back on the axis of the first column Ca so that it successively crosses the fourth and fifth row electrodes Y4 and Y5 by forming the pixels PX10 and PX13; a baffle 15 separates it again from the first column Ca and it takes a direction perpendicular to the sixth row electrode Y6 which it crosses at a simple crossing Cs located outside the first column Ca.
  • the second column electrode X2 to start is parallel to the first column electrode X1 and crosses the first row electrode Y1 according to a simple crossing Cs, crossing after which it has a return baffle 16 which places it on the axis of the first column Ca so that it successively crosses the second and third row electrodes Y2, Y3 along the same straight line with which it constitutes the fourth and seventh pixels PX4, PX7; then it is offset from the axis of the first column Ca by a spacer baffle 15 and crosses the fourth and fifth row electrodes Y4 and Y5 by simple crossings Cs before being brought back to the axis of the first column Ca by a return baffle 16.
  • the sixth line electrode Y6 which it crosses constituting the sixteenth pixel PX16.
  • the same shape is given to the third and fourth column electrodes X3, X4 which together make it possible to constitute a second column Cb of pixels formed by the pixels PX2, PX5, PX8, PX11, PX14 and PX17; the fifth and sixth column electrodes X5, X6 likewise constitute pixels PX3, PX6, PX9, PX12, PX15, PX18 aligned in the same column Cc.
  • each column electrode X1 to X6 has straight sections T between row electrodes Y1 to Y6 which are adjacent but belong to different groups G1, G2, G3, this as well between simple crossings Cs as crosses with enlarged surface Sc forming pixels; which results in a reduction in the number of baffles and a simplification of manufacturing.
  • FIG. 4 shows that the invention is also applicable to the case of a plasma panel 1 of the coplanar maintenance type.
  • the panel 1 comprises 8 pixels arranged in two columns: a first column of pixels Ca comprises four pixels PX1, PX3, PX5, PX7 and the second column Cb comprises the four pixels PX2, PX4, PX6, PX8.
  • the pixels PX1 to PX8 are defined at the crossing between only addressing electrodes forming, in the nonlimiting example described, four column electrodes, X1, X2, X3 and X4, with pairs of maintenance electrodes at number of four P1, P2, P3, P4 and which are perpendicular to the addressing only electrodes; the pairs P1 to P4 are therefore arranged in lines.
  • each pair P1 to P4 is constituted by a so-called maintenance only electrode E1 to E4, the function of which is only to allow maintenance discharges and which, at the same instants are brought to the same potentials; so that these maintenance-only electrodes do not have to be addressed and therefore do not have to be individualized, and can optionally be all connected to each other on the side of their first end 25, by a connecting conductor 20 and can be connected to the same output 22 of a pulse generator 21.
  • Each pair P1 to P4 further comprises a so-called addressing-maintenance electrode Y'1 to Y'4 which has the function on the one hand, with the maintenance only electrodes E1 to E4 of ensuring the maintenance discharges pixels PX1 to PX8, and which also provides an addressing function; the column electrodes X1 to X4 providing only an addressing function.
  • the addressing-maintenance electrodes Y'1 to Y'4 must be individualized as was the case for the electrodes Y1 to Y4 of the previous examples.
  • the address-maintenance electrodes are assembled in groups G1, G2, each group comprising at least two address-maintenance electrodes linked together and with the control and addressing device line 3 d 'the same way as in the previous examples for the line electrodes Y1 to Y4. In the example shown in FIG.
  • the first and second addressing-maintenance electrodes Y'1, Y'2 are connected together on the side of their first end 5 and connected to the output SG1 of the control device and addressing 3 and they are also connected to each other on the side of their second end 6 by a link 12.
  • the electrodes of the pairs P1 to P4 are represented in a plane deeper than that of the column electrodes X1 to X4.
  • a first maintenance-only electrode E1 forms a pair P1 with a first addressing-maintenance electrode Y'1; then a second addressing-maintenance electrode Y'2 constitutes a second pair P2 with a second maintenance-only electrode E2; there is then a third maintenance-only electrode E3 which we note that it is connected by a link 26 to the second maintenance-only electrode E2, on the side of a second end 27 of these electrodes.
  • the third maintenance only electrode E3 forms a third pair P3 with a third addressing-maintenance electrode Y'3; this third addressing-maintenance electrode Y'3 is followed by a fourth addressing-maintenance electrode Y'4 which constitutes, with a fourth maintenance-only electrode E4, a fourth pair P4 of maintenance electrodes.
  • the first column electrode X1 crosses the first pair P1 above projecting parts 30, 31 with which the maintenance only electrodes E1 to E4 and the addressing-maintenance electrodes Y'1 to Y'4 are provided respectively.
  • These protrusions 30, 31 constitute localized increases in the surface of these electrodes, and in the same pair P1 to P4 the protrusions 30, 31 are opposite and oriented towards one another.
  • These projecting parts 30, 31 are arranged at the pixels PX1 to PX8, and one of the advantages of these projecting parts is to locate the maintenance discharges.
  • Another advantage in the context of the present invention is that at least one of these projecting parts 30, 31, in particular that which belongs to the addressing-maintenance electrodes Y'1 to Y'4 makes it possible to obtain a crossing surface Sc at each pixel larger than the intersectlon surface St formed at the simple crossing Cs of a column electrode X1 to X4 with one of the maintenance electrodes, that is to say outside the one of these projecting parts; this latter crossing then constituting a simple crossing Cs, if the previously mentioned potential differences are small enough for electrical discharges to be generated between a pair P1 to P4 and a column electrode X1 to X4 only at the pixels PX1 to PX8.
  • the widened crossing surfaces Sc that is to say which make it possible to constitute a pixel, can also be obtained by playing on the shape of the line electrodes, which is the case elsewhere in the example described with reference to FIG. 4 where it must be admitted that the maintenance electrodes Y'1 to Y'4 or E1 to E4 are electrodes arranged in line.
  • the line electrodes Y1 to Y4 may have a geometry of the type shown for example in FIGS. 5 in order to produce crossing surfaces with an enlarged surface.
  • FIG. 5 shows row electrodes Y1, Y2 which are represented in a deeper plane than column electrodes X2, X3 relative to the plane of the figure; the example being limited to the representation of two row electrodes and two column electrodes Y1, Y2 and X1, X2 to simplify FIG. 5.
  • the embodiment shown in FIG. 5 makes it possible to obtain crossing surfaces Sc with surface enlarged, that is to say capable of forming pixels by a modification of the geometry of the electrodes of the lines Y1, Y2 at the places provided for forming these pixels. In the nonlimiting example described, this embodiment is particularly applicable to a distribution of the pixels as shown in FIG.
  • the line electrodes Y1, Y2 each consist of first and second parallel conductors 35, 36 each having for example a width l3 which was also the width of the line electrodes in the previous examples; the column electrodes X1, X2 having the second width l2 (the smallest).
  • the two conductors 35, 36 of the same row electrode Y1, Y2 are connected by a bonding surface S1 which can be assimilated to an increase in the width 13 of one or the other or of the two conductors 35, 36.
  • the crossings have a greater crossover area Sc at the crossovers intended to constitute pixels than for the other crossings: thus for example starting from the top of the figure, the first column electrode X1 crosses the first row electrode Y1 at a surface of connection S1 so that the crossing surface Sc is sufficient to constitute a pixel PX1, that is to say that the voltage applied between the column electrode X1 and the row electrode Y1 makes it possible to generate discharges at this level; then the first column electrode X1 crosses the second row electrode Y2 successively at the level of the first and of the second conductor 35, 36 with which it successively forms intersection surfaces St which do not make it possible to obtain discharges with voltage conditions also weak than those which allow discharges at the pixel PX1.
  • This description constitutes a nonlimiting example which shows on the one hand, that it is possible to form a number of crossings between row electrodes and column electrodes greater than the number of pixels desired, by producing larger crossing surfaces Sc at the level of the pixels than for the other crossings Cs and by adjusting the voltages VX and the voltages VY applied respectively to the column electrodes and to the row electrodes so that the potential differences VX-VY generated by these voltages between these column electrodes and row electrodes are sufficient for obtain electrical discharges at the pixel level and insufficient to produce electrical discharges at the level of the other simple crossings; of course, other embodiments are possible without departing from the scope of the invention, as regards for example the shape of the electrodes and their arrangement in rows or columns, or also the position of the column electrodes on the side of the visible part of the panel or vice versa.
  • This description also shows how to arrange the different row and column electrodes in order to obtain, in combination with the above-mentioned production of pixels and an increase in the number of column electrodes, row electrodes assembled by group; the line electrodes of the same group being connected to the same output of the command and addressing register line 3, so that for the same number of lines of pixels (each line L1 to L4 of pixels corresponding to a line electrode Y1 at Y4) the number of addresses is reduced; and it is possible to simultaneously control the pixels which are formed using line electrodes situated at the same address, that is to say belonging to the same group G1, G2, the selection of the pixels belonging to the same group being obtained by addressing or choice of column electrodes whose number is increased.
  • the invention can be applied to all plasma panels of the alternative type, regardless of precisely their production technology and their control mode.
  • the invention can also be applied to the case of plasma panels of the continuous type, for which the implementation of the invention offers additional advantages because in these panels of the continuous type, the number of lines to be controlled limits not not only the duration of the total addressing cycle, but also the amount of light that a pixel can emit.
  • the application of the invention therefore makes it possible, in the case of the plasma panel of the continuous type, to improve each of these two parameters at the same time.

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  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of Gas Discharge Display Tubes (AREA)
  • Gas-Filled Discharge Tubes (AREA)

Claims (20)

  1. Plasmaanzeigetafel mit Pixeln (PX1 bis PX16), die in Zeilen (L1 bis L4) und Spalten (C1 bis C8, Ca bis Cd) angeordnet sind, mit Spaltenelektroden (X1 bis X8), die die Zeilenelektroden (Y1 bis Y4) kreuzen und eine Vielzahl von Kreuzungspunkten (Cr, Cs) definieren, mit einer Spaltensteuer- und -adressiervorrichtung (2), an die die Spaltenelektroden (X1 bis X8) angeschlossen sind, mit einer Zeilensteuer- und Adressiervorrichtung (3), an die die Zeilenelektroden (Y1 bis Y4) angeschlossen sind, wobei jeder Kreuzungspunkt eine Kreuzungsfläche (Sc, St) besitzt, die von den einander gegenüberliegenden Flächen der Zeilenelektrode (Y1 bis Y4) und der entsprechenden Spaltenelektrode (X1 bis X8) gebildet wird, dadurch gekennzeichnet, daß die Kreuzungspunkte einerseits von einfachen Kreuzungspunkten (Cs) und andererseits von erweiterten Kreuzungspunkten mit einer größeren Kreuzungsfläche (Sc) als die der einfachen Kreuzungspunkte (Cs) gebildet werden, wobei jedes Pixel (PX1 bis PX16) im wesentlichen in Höhe einer erweiterten Kreuzungsfläche ausgebildet ist, und daß mindestens zwei Zeilenelektroden (Y1, Y2) an einen gemeinsamen Ausgang (SY1) der Zeilensteuer- und -adressiervorrichtung (2) angeschlossen sind, wobei die Anzahl M von Spaltenelektroden (X1 bis X4) größer als die Anzahl N der in einer mit Hilfe einer einer Elektrodengruppe zugehörenden Zeilenelektrode (Y1 bis Y4) gebildeten Zeile (L1 bis L4) enthaltenen Pixel (PX1 bis PX16) ist.
  2. Plasmatafel nach Anspruch 1, dadurch gekennzeichnet, daß die Zeilenleiter (Y1 bis Y4) in mehrere Gruppen (G1, G2) eingeteilt sind, die je mindestens zwei miteinander verbundene Zeilenelektroden (Y1, Y2; Y3, Y4) enthalten, wobei jede Gruppe (G1, G2) an einen anderen Ausgang (SG1, SG2) der Zeilensteuer- und -adressiervorrichtung (3) angeschlossen ist.
  3. Plasmatafel nach Anspruch 2, dadurch gekennzeichnet, daß alle Gruppen (G1, G2) eine gleiche Anzahl n von Zeilenelektroden (Y1 bis Y4) enthalten.
  4. Plasmatafel nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Spaltenelektroden (X1 bis X4) und/oder die Zeilenelektroden (Y1 bis Y4) in Höhe der Pixel (PX1 bis PX16) eine größere Breite (l1, Sl) als (l2, l3) in Höhe der einfachen Kreuzungspunkte (Cs) besitzen.
  5. Plasmatafel nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Zahl M von Spaltenelektroden (X1 bis X4) dem Produkt der Zahl n von Zeilenelektroden (Y1 bis Y4), die eine gemeinsame Gruppe (G1, G2) bilden, mit der Anzahl N von Pixeln (PX1 bis PX16) in einer Pixelzeile (l1 bis L4) entspricht, also M = n x N
    Figure imgb0003
     .
  6. Plasmatafel nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Spaltenelektroden (X1 bis X4) im wesentlichen geradlinig verlaufen.
  7. Plasmatafel nach einem beliebigen der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Spaltenelektroden (X1 bis X4) und/oder die Zeilenelektroden (Y1 bis Y4) Kurven (15, 16) aufweisen.
  8. Plasmatafel nach Anspruch 7, dadurch gekennzeichnet, daß eine Pixelspalte (C1 bis C4) von mindestens zwei Spaltenelektroden (X1 bis X4) gebildet wird.
  9. Plasmatafel nach Anspruch 7, dadurch gekennzeichnet, daß die Kurven (15, 16) durch aufeinanderfolgende Richtungsänderungen gebildet werden, die im wesentlichen senkrecht von einer Richtung zur anderen übergehen.
  10. Plasmatafel nach einem der vorhergehenden Ansprüche dadurch gekennzeichnet, daß die Spaltenelektroden (X1 bis X4) und/oder die Zeilenelektroden (Y1 bis Y4) mindestens von zwei zueinander parallelen Leitern gebildet werden, die miteinander über eine Verbindungsfläche (Sl) in Höhe der erweiterten Kreuzungspunkte (Sc) verbunden sind, wo Pixel (PX1 bis PX16) liegen.
  11. Plasmatafel nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß mindestens zwei Zeilenelektroden (Y1 bis Y4) einer gemeinsamen Gruppe (G1, G2) miteinander an jedem ihrer Enden 5, 6) verbunden, sind.
  12. Plasmatafel nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Zeilen- und Spaltensteuer- und -adressiervorrichtungen (2, 3) Spannungen (VY, VX) liefern, die ausreichend sind, um elektrische Entladungen in Höhe der Pixel (PX1 bis PX16) zu erzeugen, aber nicht ausreichen, um solche Entladungen in Höhe der einfachen Kreuzungspunkte (Cs) zu erzeugen.
  13. Plasmatafel nach einem beliebigen der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß sie vom Wechselspannungstyp mit koplanarer Entladungsunterhaltung ist.
  14. Plasmatafel nach Anspruch 13, dadurch gekennzeichnet, daß sie Paare (P1 bis P4) von Unterhaltungselektroden enthält, die sich mit nur der Adressierung dienenden Elektroden (X1 bis X4) kreuzen, wobei jedes Elektrodenpaar (P1 bis P4) von einer der Adressierung und der Unterhaltung dienenden Elektrode (Y'1 bis Y'4) und einer nur der Unterhaltung dienenden Elektrode (E1 bis E4) gebildet wird und wobei die der Adressierung und der Unterhaltung dienenden Elektroden (Y'1 bis Y'4) und die nur der Unterhaltung dienenden Elektroden (E1 bis E4) vorspringende Flächen (30, 31) enthalten, die zwischen den beiden Elektroden eines gemeinsamen Paars (P1 bis P4) aufeinanderzu weisen und am Kreuzungspunkt mit einer nur der Adressierung dienenden Elektrode (X1 bis X4) eine vergrößerte Fläche zu definieren vermögen, an der ein Pixel (PX1 bis PX16) liegt.
  15. Plasmatafel nach Anspruch 14, mit einer ersten und einer zweiten Adressiervorrichtung (2, 3), an die die nur der Adressierung dienenden Elektroden (X1 bis X4) bzw. die der Adressierung und Unterhaltung dienenden Elektroden (Y'1 bis Y'4) angeschlossen sind, dadurch gekennzeichnet, daß die der Adressierung und Unterhaltung dienenden Elektroden (Y'1 bis Y'4) in mehrere Gruppen (G1, G2) eingeteilt sind, die je mindestens zwei der Adressierung und der Unterhaltung dienende Elektroden (Y'1 bis Y'4) enthalten, die miteinander verbunden sind, wobei jede Gruppe (G1, G2) an einen anderen Ausgang (SG1, SG2) der zweiten Adressiervorrichtung (3) angeschlossen ist.
  16. Plasmatafel nach Anspruch 14, dadurch gekennzeichnet, daß die Anordnung der nur der Unterhaltung dienenden Elektroden (E1 bis E4) und die der Adressierung und Unterhaltung dienenden Elektroden (Y'1 bis Y'4) mindestens eine Folge von zwei nur der Unterhaltung dienenden Elektroden (E1 bis E4)enthält, denen zwei der Adressierung und Unterhaltung dienenden Elektroden (Y'1 bis Y'4) einer gleichen Gruppe (G1, G2) folgen.
  17. Plasmatafel nach Anspruch 16, dadurch gekennzeichnet, daß zwei aufeinanderfolgende, einer gleichen Gruppe (G1, G2) angehörende, der Adressierung und der Unterhaltung dienende Elektroden (Y'1 bis Y'4) an ihren beiden Enden (5, 6) miteinander verbunden sind.
  18. Plasmatafel nach Anspruch 17, dadurch gekennzeichnet, daß zwei aufeinanderfolgende, nur der Unterhaltung dienende Elektroden (E1 bis E4) miteinander an ihren beiden Enden (25, 27) verbunden sind.
  19. Plasmatafel nach Anspruch 15, dadurch gekennzeichnet, daß außer den erweiterten Kreuzungsflächen zur Ausbildung der Pixel (PX1 bis PX16) die Kreuzungspunkte zwischen nur der Adressierung dienenden Elektroden (X1 bis X4) und den Elektrodenpaaren (P1 bis P4) einfache Kreuzungspunkte (Cs) bilden, deren Kreuzungsfläche (St) kleiner als die Kreuzungsfläche (Sc) der Pixel (PX1 bis PX16) ist, und daß die Adressiervorrichtungen (2, 3) Spannungen (VY, VX) liefern, die ausreichen, um elektrische Entladungen in Höhe der Pixel (PX1 bis PX16) hervorrufen, aber nicht ausreichen, um solche Entladungen in Höhe der einfachen Kreuzungspunkte (Cs) zu erzeugen.
  20. Plasmatafel nach Anspruch 14, dadurch gekennzeichnet, daß die nur der Adressierung dienenden Elektroden (X1 bis X4) Spaltenelektroden bilden und daß die Elektrodenpaare (P1 bis P4) in Zeilenrichtung angeordnet sind.
EP89402284A 1988-08-30 1989-08-11 Plasma-Anzeigeplatte mit modifizierter Adressierbarkeit Expired - Lifetime EP0361992B1 (de)

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FR8811355A FR2635900B1 (fr) 1988-08-30 1988-08-30 Panneau a plasma a adressabilite accrue
FR8811355 1988-08-30

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FR2758204B1 (fr) 1997-01-07 1999-04-09 Thomson Tubes Electroniques Procede de commande d'adressage d'un panneau a plasma de type alternatif
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HK83996A (en) 1996-05-17
FR2635900A1 (fr) 1990-03-02
DE68909881T2 (de) 1994-02-10
FR2635900B1 (fr) 1990-10-12
US5086257A (en) 1992-02-04
EP0361992A1 (de) 1990-04-04

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