EP0357485B1 - Zeile-pro-Zeile-Ansteuerverfahren einer Plasmaanzeigetafel vom wechselspannungsbetriebenen Typ mit koplanarer Unterstützung - Google Patents

Zeile-pro-Zeile-Ansteuerverfahren einer Plasmaanzeigetafel vom wechselspannungsbetriebenen Typ mit koplanarer Unterstützung Download PDF

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Publication number
EP0357485B1
EP0357485B1 EP89402281A EP89402281A EP0357485B1 EP 0357485 B1 EP0357485 B1 EP 0357485B1 EP 89402281 A EP89402281 A EP 89402281A EP 89402281 A EP89402281 A EP 89402281A EP 0357485 B1 EP0357485 B1 EP 0357485B1
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Prior art keywords
electrodes
holding
maintenance
addressing
gating signal
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EP89402281A
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English (en)
French (fr)
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EP0357485A1 (de
Inventor
Serge Salavin
Jacques Deschamps
Michel Gay
Michel Specty
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Thales SA
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Thomson CSF SA
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
    • G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
    • G09G3/291—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes
    • G09G3/294—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes for lighting or sustain discharge
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
    • G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
    • G09G3/291—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes
    • G09G3/292—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes for reset discharge, priming discharge or erase discharge occurring in a phase other than addressing
    • G09G3/2927—Details of initialising
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
    • G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
    • G09G3/291—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes
    • G09G3/293—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels controlling the gas discharge to control a cell condition, e.g. by means of specific pulse shapes for address discharge
    • G09G3/2932—Addressed by writing selected cells that are in an OFF state
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/28—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels
    • G09G3/288—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels
    • G09G3/298—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using luminous gas-discharge panels, e.g. plasma panels using AC panels using surface discharge panels

Definitions

  • the present invention relates to a method of line-by-line control of a plasma panel of the alternative type with coplanar maintenance, and particularly of a plasma panel in which each elementary image point is defined substantially at the intersection of a first electrode. called “column electrode” with two other parallel electrodes called “maintenance electrodes”.
  • Plasma panels are flat screen display devices, which allow the display of alphanumeric, graphic or other images, in color or not. These panels work on the principle of an emission of light produced by an electric discharge in a gas.
  • Plasma panels include two insulating tiles limiting a volume occupied by a gas (generally a mixture based on neon). These slabs support crossed conductive electrodes so as to define a matrix of elementary points of images or pixels. An electric discharge in the gas, causing an emission of light at the level of an image point or pixel, takes place when the electrodes of this pixel are suitably excited.
  • a gas generally a mixture based on neon.
  • the aforementioned patent application also explains how to erase one or more cells, using an erasure signal, the rising edge of which is constituted by a ramp.
  • each pixel of the matrix is constituted by three electrodes, more precisely at the intersection between an addressing electrode called column electrode with two parallel maintenance electrodes forming a pair of electrodes d 'interview.
  • the maintenance of the discharges is ensured between the two electrodes of the same pair, and the addressing is done by generation of discharge between two crossed electrodes; by addressing is meant discharges generated so selective and / or semi-selective with a view to carrying out a registration or deletion operation.
  • the maintenance electrodes comprise two families: the electrodes of a first family are called “addressing-maintenance electrodes" and the electrodes of the second family “electrodes only of maintenance".
  • the maintenance addressing electrodes have the function, in cooperation with the maintenance only electrodes (of the second family), of ensuring maintenance discharges; but they also have to provide an addressing function, and therefore they must be individualized, that is to say that they must, for example, be connected to one or more pulse generating devices by the intermediary of means which make it possible to apply one or more particular pulses, to only one or more address-maintenance electrodes which are selected from the plurality of address-maintenance electrodes.
  • the column electrodes are also individualized.
  • these are generally connected to one or more pulse generators in such a way that these maintenance electrodes of the second family are all, at the same times, brought to the same potentials so that it is not necessary to individualize them and that they can possibly be linked together.
  • a pixel is defined at the intersection of a column electrode with a pair of maintenance electrodes
  • the addressing-maintenance and only maintenance electrodes may each include, at the level of each pixel, a protrusion or protruding surface; in the same pair of maintenance electrodes, the projecting surfaces of one electrode are oriented towards those of the other electrode, the maintenance discharges taking place between these projecting surfaces.
  • Such a plasma screen is known in particular from the European patent document EP-A-0 135 382 which also describes a method for controlling this screen; it should be noted that in the device described in this European patent, the column electrode crosses the pairs of maintenance electrodes on the side of the projecting surfaces where the maintenance discharges are produced.
  • each pixel is defined at the intersection of a column electrode with a pair of maintenance electrodes and a suitable control method are described in the article by GW DICK published in PROCEEDINGS OF THE SID , flight. 27/3, 1986, pages 183-187.
  • the maintenance electrodes have a constant width, that is to say that they do not have a projecting surface facing one another in a pair of maintenance electrode, to define the maintenance discharge zone, this structure on the other hand comprises barriers made of insulating material, which serve to confine maintenance discharges in the crossing zone with the column electrode.
  • FIG. 1 Another type of plasma panel, to which the method of the invention applies in a particularly advantageous manner, is represented in FIG. 1.
  • a panel is the subject in itself of a French patent application No. 88 03953 filed March 25, 1988 on behalf of THOMSON-CSF.
  • This French patent application was published under the number FR-A-2 629 265, the new type of plasma panel to which it relates is described below.
  • the panel shown in FIG. 1 comprises a first glass slab 10 covered with a first family of electrodes denoted Xj, where j is an integer ranging from 1 to N (a single electrode Xj is shown; the slab assembly 10- electrode Xj is covered with a layer 12 of dielectric material, possibly covered with an oxide layer such as MgO (not shown) facilitating electronic emission.
  • a wafer 14 of a phosphor material that is to say capable of emitting colored radiation, under the effect of ultraviolet radiation.
  • the panel also comprises a second glass slab 20 covered with a second family of electrodes constituted by pairs of electrodes called respectively, of maintenance-addressing (Yae) i and of maintenance (Ye), where i is an integer between 1 and P.
  • the maintenance-addressing and maintenance electrodes include protrusions or protruding surfaces 22 and 24, arranged opposite one another.
  • the 20-electrode slab assembly is covered with a dielectric layer 26.
  • the two slabs 10 and 20 and their networks of electrodes are brought closer together and kept apart by a thickness spacer (not shown), and a gas is present in the volume comprised between the slabs and the spacer.
  • the panel thus has two arrays of orthogonal electrodes, in the sense that the electrodes Xj are orthogonal to the electrodes (Yae) i and (Ye).
  • the electrodes Xj can overlap the protrusions 22 and 24 or be slightly offset on the side thereof.
  • a pixel Pij is then defined by an electrode Xj (column electrode) and a pair of maintenance electrodes (Yae) i and (Ye).
  • the control method according to the invention makes it possible to eliminate or considerably reduce the drawbacks mentioned above.
  • the proposed control method is of the video compatible type, that is to say which allows addressing by complete line so as to reduce the scanning time; on the other hand, it allows a reduced cycle time which results in a high maintenance frequency and a high luminance.
  • the proposed control method also makes it possible to reduce the number of voltage levels applied to the different electrodes and thus to simplify the control electronics; it should be noted that the method of the invention also makes it possible to apply to the column electrode only relatively low power and amplitude pulses which allows the use of integrated circuits of low cost technology .
  • a method of line-by-line control of a plasma panel of the alternative type with coplanar maintenance comprising crossed column electrodes with two families of parallel maintenance electrodes, the first family of electrodes being made up of addressing-maintenance electrodes and the second family consisting of maintenance-only electrodes, each addressing-maintenance electrode forming with a maintenance-only electrode adjoining a pair of maintenance electrodes, each pair of electrodes maintenance corresponding to a line of pixels perpendicular to the column electrodes, the pixels being formed substantially at each crossing of a column electrode with a pair of maintenance electrodes, said method consisting in applying a first set of cyclic pulses to all the addressing-maintenance electrodes and a second set of cyclic pulses to all the so-called maintenance-only electrodes, the two sets of pulses having the same period, during which said implusions develop between the two electrodes of each pair of '' voltage maintenance electrodes which constitute an erasure phase and a registration phase occurring after the phase erase, said
  • FIG. 2 is a general block diagram of a plasma panel 1 to which the method of applying command of the invention.
  • the plasma panel 1 is mainly represented by conductors or electrodes arranged in column X1, X2, X3, X4, and by two families of maintenance conductors or electrodes arranged in line, on the one hand Y1, Y2, Y3, Y4 for the first family, and on the other hand , E1, E2, E3, E4 for the second family.
  • the maintenance electrodes Y1 to Y4 and E1 to E4 are arranged in pairs, that is to say that a first electrode Y1 of the first family is associated with an adjacent electrode E1 belonging to the second family, to constitute a pair P1 of maintenance electrodes; a second electrode Y2 of the first family is associated with a second electrode E2 of the second family to constitute a second pair P2 of maintenance electrodes; and likewise for the electrodes Y3 and E3 then Y4 and E4 which respectively constitute a third and a fourth pair P3, P4 of maintenance electrodes.
  • an elementary image point or pixel PX1 to PX16 is formed which is symbolized in FIG.
  • each pixel which can be formed for example according to the structure represented in FIG. 1 and the two electrodes of each pair of electrodes P1 to P4 may or may not have protuberances or projecting parts (not shown in FIG. 2) shown in FIG. 1 with the marks 22, 24.
  • the electrodes Y1 to Y4 of the first family are address-maintenance type electrodes, so these address-maintenance electrodes Y1 to Y4 are individualized, that is to say that they are each connected to a different output SY1 to SY4 of a first addressing device G1; the first addressing device G1 is of a conventional type in itself capable of supplying voltage pulses which will be further explained with reference to FIG. 3a.
  • the electrodes E1 to E4 of the second family E are of the maintenance only type: in the non-limiting example described, they are connected together and connected to the output SE of a pulse generator device G2 which delivers voltage pulses which will be explained more clearly with reference to FIG. 3b.
  • Column electrodes X1 to X4 conventionally perform only an addressing role. They are each connected to a different output SX1 to SX4 of a second addressing device G3; the second addressing device G3 delivers voltage pulses which will also be explained in a continuation of the description relating to Figures 3d to 3g.
  • the devices G1, G2, G3 are themselves controlled and synchronized, in a conventional manner, by a central control unit (not shown) which manages in a known manner itself the switching on or off or the maintenance pixels PX1 to PX16 on or off.
  • a line L1 to L4 is a line of pixels formed by the pixels PX1 to PX16 defined by each pair P1 to P4 of maintenance electrodes: thus the first line L1 contains the 4 pixels PX1 to PX4, and corresponds to the pair P1 of maintenance electrodes; the second line L2 contains 4 pixels PX5 to PX8 and corresponds to the second pair P2 of electrodes; the third line L3 contains the pixels PX9 to PX12 and corresponds to the third pair P3 of electrodes; the fourth line L4 contains the pixels PX13 to PX16 and corresponds to the fourth pair P4.
  • FIGS. 3a to 3h show diagrams of signals explaining the operation of the plasma panel 1 controlled according to the method of the invention.
  • the signals which are applied when we want to successively turn off one pixel and turn on another thus for example, on the second line L2, turn off (this is i.e. erase) the sixth PX6 pixel, and turn on (i.e.) write the seventh PX7 pixel.
  • the sixth pixel PX6 is located at the intersection between the second pair of PE2 electrodes and the second column electrode X2; and that the seventh pixel PX7 is located at the intersection between the second pair of electrodes PE2 and the third column electrode X3.
  • FIGS. 3a and 3b respectively show a first and a second set of cyclic voltages VY, VE which are applied respectively simultaneously to all the addressing-maintenance electrodes Y1 to Y4 and simultaneously to all the maintenance-only electrodes E1 to E4.
  • FIG. 3c illustrates maintenance discharges produced between the electrodes Y2 and E2 of the second pair P2 of electrodes.
  • Figures 3d, 3e, 3f, 3g respectively show voltage pulses forming masking pulses applied to the column electrodes X1 to X4.
  • FIG. 3 h illustrates a DI registration discharge between the third column electrode X3 and the second electrode Y2.
  • the first and second sets of voltages VY, VE vary on either side of the same reference voltage VR which is at zero volts for example.
  • the first and second sets of voltage VY, VE are constituted respectively by a first and a second set of voltage pulses having a cyclic character and a same period T.
  • T the combination of the applied voltage pulses of on the one hand to the address-maintenance electrodes Y1 to Y4, and, on the other hand, to the electrodes only maintenance E1 to E4, develops between the 2 electrodes of each pair P1 to P4 voltages (not shown) which determine an erasing phase T1 and a writing phase T2.
  • the cycles T also include a maintenance phase T3 which is optional, as is explained further in the description below.
  • a maintenance window CEe begins which is applied to the maintenance only electrodes E1 to E4, and the transition of which represents a voltage variation ⁇ VE which in example s 'performs substantially symmetrically with respect to the reference voltage VR; this first maintenance interval CEe applied to the maintenance only electrodes E1 to E4 passing for example to a negative polarity, from a voltage + VE1 to a voltage -VE1.
  • this CEY maintenance slot having a positive polarity, that is to say opposite to that which at the same time is applied to the electrodes only of maintenance E1 to E4, the transition having been carried out at time t0 from a negative voltage -VY1 to a positive voltage + VY1; in the nonlimiting example described, this transition represents a voltage variation ⁇ VY1 which is carried out in a manner substantially symmetrical with respect to the reference voltage VR.
  • the maintenance slots CEY and CEe applied respectively to all the addressing-maintenance electrodes Y1 to Y4 and all the maintenance electrodes E1 to E4 are maintained until an instant t2.
  • the polarities of the voltages VY and VE are reversed and remain opposite until an instant t4 which marks the start of the erasure phase T1.
  • the transition of the maintenance slots CEY and CEe causes a new maintenance discharge De2 at the level of the sixth pixel PX6; as for the previous maintenance discharge, this discharge ends at an instant t3 where charges accumulated on the maintenance electrodes YE, E2, with a polarity opposite to that which they had at the instant t2, are in quantity sufficient to cause extinction.
  • the polarities of the voltages VE and VY applied respectively to the maintenance electrodes E1 to E4 and to the address-maintenance electrodes Y1 to Y4 reverse again and remain opposite .
  • the slots applied to the electrodes only for maintenance E1 to E4 always have the same amplitude ⁇ VE, that is to say that only 2 voltage levels (+ VE1 and -VE1) are necessary to control these electrodes d interview E1 to E4.
  • the voltage VE is formed by a voltage slot of positive polarity which is applied to the maintenance only electrodes E1 to E4, while at the same time, a slot CBe of opposite polarity, that is to say ie negative, is applied to the addressing-maintenance electrodes Y1 to Y4; but this slot Cbe reaches a value VY2 lower than the value VY1, and it retains this value VY2 until an instant t7 when the polarity of the voltage VY reverses again.
  • the transition of the slot CBe applied to the addressing-maintenance electrodes Y1 to Y4 has a value ⁇ VY2 lower than the value ⁇ VY1 of a maintenance slot CEY, so that the potential developed between the maintenance electrodes Y1 to Y4 and E1 to E4 is insufficient to cause a maintenance discharge, even when it is added to the effect of charges already stored on these maintenance electrodes.
  • the slots applied to the addressing-maintenance electrodes Y1 to Y4 at time t4, are intended to form a voltage base or step called the erasing base slot CBe which is superimposed, only on the slot applied to the electrode addressing-maintenance of the pair P1 to P4 addressed (namely in this case only the slot applied to the second addressing-maintenance electrode Y2), a voltage pulse called erase pulse IE, IE '.
  • the erasure pulse may have the form of a rectangular slot having either a high amplitude and a short duration, or a low amplitude and a long duration, or even be formed of a pulse whose rising edge is established relatively slowly and constitutes a ramp, as explained in the patent application No. 78 04893 cited above, filed in the name of THOMSON-CSF and published under No. FR-A-2 417 848, and which must be considered to be part of this description.
  • the erasing pulse IE (shown in dashed lines) which is superimposed on the erasing base slot CBe, is a pulse whose rising edge R is established relatively slowly as described in the aforementioned patent, until substantially reaching the first value VY1; but the erasing pulse could also be constituted by an IE ′ pulse (shown in dashed lines) of relatively short duration, and which would be superimposed on the erasing basic slot CBE from for example from time t4.
  • the niche erasing IE, IE ' is superimposed on a basic erasing slot CBe only for the pair of electrodes P1 to P4 addressed; taking into account the example described, it is only to the second addressing electrode Y2 that an erasing base slot CBe is applied to which an erasing pulse IE, IE ′ is superimposed.
  • the erase pulse is the one whose rising edge constitutes a ramp R
  • the superposition of this erase pulse IE with the basic slot CBe will cause substantially at time t5 when the ramp R reaches substantially the first value VY1, an erasure discharge DEF between the second addressing-maintenance electrode Y2 and the second solely maintenance electrode E2, at the level of each pixel.
  • This erasure discharge is of lower intensity than the maintenance discharges DE1, DE2, and substantially ceases at an instant t6 without causing the accumulation of charges as in the case of the maintenance discharges DE1, DE2. In this configuration, all the pixels PX5 to PX8 of the second pair P2 are erased.
  • an important characteristic of the process of the invention consists in generating an erasure discharge only between the two maintenance electrodes Y2, E2 of the same given pair P2, this erasure discharge DEF having the effect to erase all the pixels which correspond to this pair P2 of electrodes.
  • the desired pixels belonging to the registration are carried out to this pair P2 of electrodes, by causing a writing discharge between the second addressing-maintenance electrode Y2 and each of the column electrodes X1 to X4 whose intersection with the second addressing-maintenance electrode Y2 represents a pixel that we want to register.
  • a writing discharge is carried out only between the second addressing-maintenance electrode Y2 and the third column electrode X3. This is done during the registration phase T2 which begins at time t8.
  • This stabilization depends on characteristics specific to the plasma panel used, so that the time interval ⁇ t1 can possibly be reduced or even eliminated, which makes it possible to reduce the duration of the period T (which represents the basic cycle).
  • This basic cycle can have an even shorter duration, as represented for example by the duration T ′, by eliminating the slots which belong to the maintenance phase T3; this is made possible by the fact that even by eliminating the maintenance phase T3, it is possible with the method of control in accordance with the invention obtain maintenance discharges by the T2 registration phase.
  • the voltage VE becomes negative; the voltage VY becomes positive by a voltage pulse CBi applied to the addressing-maintenance electrodes Y1 to Y4; the voltage VY then passes to the value VY1, that is to say a variation ⁇ VY1 by which it is possible to obtain maintenance discharges for all the pixels entered. So for example if we had not erased the sixth pixel P6 (at the same time as the other pixels of the second line L2), we would have kept charges on the electrodes Y2 and E2 which would have allowed to produce a discharge of 'interview De3 (shown in dotted lines) at time t8.
  • a registration window CI is superimposed on the voltage window CBi which, between time t8 and time t12, is applied to all the electrodes d addressing-interview.
  • a registration slot CI is only superimposed on the basic registration slot CBi which is applied to the desired address, that is to say to the address-maintenance electrode of the pair of electrodes in question, namely in the example the second addressing-maintenance electrode Y2 of the second pair 2.
  • the voltage slot CBi thus constitutes a basic recording slot forming a voltage step at which s adds the voltage of the CI registration window; but it also constitutes a maintenance window for the pairs P1, P3, P4 of the other addressing-maintenance electrodes Y1, Y3, Y4, not addressed.
  • the registration window CI superimposed on the basic registration window CBI reaches a voltage value VY3 such that the potential difference which is then generated between the column electrodes X1 to X4 and the second addressing-maintenance electrode Y2 can cause a discharge, called registration discharge, at the intersection between the latter and the column electrodes X1 to X4.
  • a voltage pulse called the masking pulse MX1 to MX4 of the same polarity as the writing slot CI; so that the potential necessary to produce a discharge between a column electrode X1 to X4 and the electrode Y2, is reached only with the column electrode to which a so-called masking pulse is not applied.
  • a masking pulse is applied to all of the column electrodes X1 to X4, none of the pixels are registered. In the nonlimiting example described, and as illustrated in FIGS.
  • the column electrodes X1 to X4 are brought to the potential of the reference voltage VR, except during the writing phase T2 where a pulse of masking can be applied to them, which brings their voltage to a VX value.
  • a masking pulse MX1, MX2, MX4 is applied to the first, the second and the fourth column electrode X1, X2, X4 , for at least and a masking pulse is not applied to the third column electrode X3.
  • the end of the registration slot CI occurs substantially at the same time as the end of the registration base slot CBi, at a time t11 which for example slightly precedes the time t12 at the end of the registration base slot CBi.
  • the potential difference between these two electrodes is reduced by reversing the polarity of the voltage VE applied to the electrodes E1 to E4 before the CI registration window is superimposed on the basic registration window CBi: from time t8, the voltage VE goes from positive to negative and constitutes a window CNE of negative polarity; then the polarity of the voltage VE (applied to the maintenance only electrodes E1 to E4) is again inverted at an instant t9 and comprises a positive polarity, this substantially at the same time or a little before the registration window begins.
  • the voltage VE then has the same polarity as the voltage VY applied to the address-maintenance electrodes and, between the second maintenance electrode E2 and the second address-maintenance electrode Y2, then there is an insufficient potential difference to cause a parasitic discharge during the superimposition of the CI registration window.
  • an advantage brought by this arrangement resides in the fact that, the masking pulses MX1 to MX4 are produced with a relatively low power (because it is with the maintenance discharges that one seeks to produce the light emitted by the pixels, and with a relatively low voltage amplitude), so that standard and low-cost components can be used for controlling the column electrodes X1 to X4. It is further noted that another important advantage provided by the method according to the invention, resides in that the discharge which is created occurs only for the points to be entered and not for all the points of the line, which tends to significantly increase the longevity of the phosphors which are used for the emission of color light.
  • the end of the basic registration window CBi corresponds to the end of the registration phase T2, and corresponds to an inversion of the polarity of the voltage VY applied to the addressing-maintenance electrodes Y1 to Y4, polarity which becomes negative.
  • the voltage VE applied to the maintenance electrodes E1 to E4 has been positive since substantially the instant t9 and, in the nonlimiting example described, it retains this positive polarity until an instant t0 'which marks the start of a new cycle.
  • the DI registration discharge generated the accumulation of negative charges (not shown) on the dielectric of the second addressing-maintenance electrode Y2 at the level of the seventh pixel PX7: also at the transition from positive to negative of the voltage VY, due to the end of the writing window CI and the basic writing window CBi, is added the effect of the presence of the negative charges accumulated on the electrode Y2 so that, appreciably when the voltage VY reaches the value -Vy1, there is a maintenance resumption discharge DRE (FIG. 3c) at the seventh pixel PX7, between the second addressing-maintenance electrode Y2 and the second maintenance electrode E2.
  • DRE maintenance resumption discharge
  • the voltages VY and VE keep their negative and positive polarity respectively until time t0 'where begins a new cycle. It should be noted that, depending on the characteristics specific to the plasma panel used, it is possible that a discharge (shown in dotted lines in FIG. 3h) occurs substantially at time t12 between the column electrode X3 and the electrode addressing-interview Y2; in such a case, a maintenance resumption discharge DRE '(shown in dotted lines in FIG. 3c) occurs at the instant t0' of the start of a new cycle.
  • the basic cycle is applied to all the maintenance electrodes with a frequency which depends on the duration of the period T, T '.
  • the duration of a period T, T 'can hardly fall below 22 microseconds or 20 microseconds. This nevertheless makes it possible to obtain very interesting performances even with a plasma panel comprising a large number of lines. Taking for example a plasma panel comprising 1000 lines, it takes 20 milliseconds to explore an entire image, that is to say it is possible to obtain 50 images per second.
  • the CEY and CEe maintenance slots have a conventional duration of the order of a few microseconds; the basic erasing slot CBe can have a duration of the order of 5 microseconds; the time interval ⁇ t1 can be of the order of 3 to 4 microseconds.
  • the basic CBi registration slot can have a duration of the order of 7 microseconds; and the registration window Ci which is superimposed on it may have a duration of approximately 4 microseconds, and / or possibly have the same shape as the erasure pulse IE whose rising edge constitutes a ramp R, and whose duration at the top can be of the order of zero to a few microseconds; the niche negative marked CNE on the voltage VE can have a duration of the order of 3 microseconds.
  • the negative slot CNE is followed by a positive slot (from time t9), this positive slot being formed, for its part formed between the end of the negative slot CNE and the time t12 at the end of the basic registration window, by a CME masking window which fulfills a function of inhibiting the registration window CI vis-à-vis the second maintenance-only electrode E2, in order to avoid a parasitic discharge between this second electrode E2 and the second addressing-maintenance electrode Y2.

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Claims (9)

  1. Verfahren zum zeilenweisen Steuern einer Plasmatafel vom Wechselspannungstyp mit komplanarer Aufrechterhaltung, wobei die Tafel Spaltenelektroden (X1 bis X4) aufweist, die mit zwei Familien von parallelen Aufrechterhaltungselektroden (Y1 bis Y4, E1 bis E4) gekreuzt sind, wobei die erste Elektrodenfamilie (Y1 bis Y4) aus Adressierungs- und Aufrechterhaltungselektroden und die zweite Familie aus sogenannten Nuraufrechterhaltungselektroden (E1 bis E4) gebildet ist, wobei jede Adressierungs- und Aufrechterhaltungselektrode (Y1 bis Y4) mit einer benachbarten Nuraufrechterhaltungselektrode (E1 bis E4) ein Paar von Aufrechterhaltungselektroden (P1 bis P4) bildet, wobei jedes Paar von Aufrechterhaltungselektroden (P1 bis P4) einer zu den Spaltenelektroden (X1 bis X4) senkrechten Zeile (L1 bis L4) von Bildelementen entspricht, wobei die Bildelemente (PX1 bis PX16) im wesentlichen in jedem Kreuzungspunkt einer Spaltenelektrode (X1 bis X4) mit einem Paar von Aufrechterhaltungselektroden (P1 bis P4) gebildet sind, wobei das Verfahren darin besteht, daß an sämtliche Adressierungs- und Aufrechterhaltungselektroden (Y1 bis Y4) eine erste zyklische Impulsfolge angelegt wird und an sämtliche sogenannte Nuraufrechterhaltungselektroden (E1 bis E4) eine zweite zyklische Impulsfolge angelegt wird, wobei die beiden Impulsfolgen dieselbe Periode (T, T') besitzen, in welcher die Impulse zwischen den Elektroden eines jeden Paars (PE1 bis PE4) von Aufrechterhaltungselektroden Spannungen aufbauen, die eine Löschphase (T1) und eine nach der Löschphase auftretende Schreibphase (T2) bilden, wobei die Spannungen außerdem Aufrechterhaltungsentladungen (DE1, DE2, DE3) erzeugen, wobei das Verfahren darin besteht, daß während der Löschphase (T1) eine gegebene vollständige Zeile (L1 bis L4) von Bildelementen gelöscht wird, indem ausschließlich zwischen der Adressierungs- und Aufrechterhaltungselektrode (Y1 bis Y4) und der sogenannten Nuraufrechterhaltungselektrode (E1 bis E4) des entsprechenden Paars (P1 bis P4) von Aufrechterhaltungselektroden Löschentladungen (DEF) hervorgerufen werden.
  2. Steuerverfahren gemäß Anspruch 1, das darin besteht, daß Aufrechterhaltungsentladungen (DE1, DE2, DE3) hervorgerufen werden, indem an sämtliche Adressierungs- und Aufrechterhaltungselektroden (Y1 bis Y4) wenigstens ein Rechteckimpuls (CEY, CBI) mit einer ersten Polarität angelegt wird und indem an sämtliche sogenannten Nuraufrechterhaltungselektroden (E1 bis E4) wenigstens ein zweiter Rechteckimpuls mit einer zur ersten entgegengesetzten zweiten Polarität angelegt wird, wobei der erste und der zweite Rechteckimpuls eine erste bzw. eine zweite Amplitude (ΔVY1, ΔVE) besitzen, dadurch gekennzeichnet, daß es während der Löschphasen darin besteht, daß an sämtliche Adressierungs- und Aufrechterhaltungselektroden (Y1 bis Y4) ein Lösch-Basisrechteckimpuls (CBe) mit einer dritten Amplitude (ΔVY2) angelegt wird, die kleiner als die erste Amplitude (ΔVY1) ist, und daß in der gleichen Zeit (t4, t6) an sämtliche sogenannten Nuraufrechterhaltungselektroden (E1 bis E4) ein dem zweiten Rechteckimpuls ähnlicher Rechteckimpuls mit einer zu derjenigen des genannten Lösch-Basisrechteckimpulses (CBe) entgegengesetzten Polarität angelegt wird, und daß ausschließlich demjenigen Lösch-Basisrechteckimpuls (CBe), der an die der gegebenen Zeile (L1 bis L4) von Bildelementen entsprechende Adressierungs- und Aufrechterhaltungselektrode (Y1 bis Y4) angelegt wird, ein Löschimpuls (IE, IE') überlagert wird.
  3. Steuerverfahren gemäß Anspruch 2, dadurch gekennzeichnet, daß der Löschimpuls (IE) aus einem Impuls gebildet ist, dessen Anstiegsflanke eine Rampe (R) bildet.
  4. Steuerverfahren gemäß einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß es zum Schreiben wenigstens eines Bildelementes (PX1 bis PX16) einer gegebenen Zeile (L1 bis L4), deren Bildelemente vorher gelöscht worden sind, darin besteht, daß an sämtliche Adressierungs- und Aufrechterhaltungselektroden (Y1 bis Y4) ein Schreib-Basisrechteckimpuls (CBi) angelegt wird, der die erste Polarität und im wesentlichen die erste Amplitude (ΔVY1) besitzt, und daß ausschließlich demjenigen Schreib-Basisrechteckimpuls (CBi), der an die der gegebenen Zeile (L1 bis L4) entsprechende Adressierungs- und Aufrechterhaltungselektrode (Y1 bis Y4) angelegt wird, ein Schreibrechteckimpuls (Ci) mit derselben ersten Polarität überlagert wird und im wesentlichen in derselben Zeit (t7, t9), in welcher der Schreibrechteckimpuls (CI) überlagert wird, Spannungsimpulse (IMX) mit derselben ersten Polarität an sämtliche Spaltenelektroden (X1 bis X4) angelegt werden, mit Ausnahme derjenigen, die der Festlegung eines zu beschreibenden Bildpunktes (PX1 bis PX16) dienen, und daß es außerdem im wesentlichen in der Zeit (t7, t9), in der der Schreibrechteckimpuls (Ci) überlagert wird, darin besteht, daß an sämtliche sogenannten Nuraufrechterhaltungselektroden (E1 bis E4) ein Spannungsrechteckimpuls angelegt wird, der die erste Polarität besitzt und einen zweiten Maskierungsimpuls (CME) bildet.
  5. Steuerverfahren gemäß Anspruch 4, dadurch gekennzeichnet, daß im wesentlichen in demjenigen Zeitpunkt (t8), in dem der Schreib-Basisrechteckimpuls (CBi) beginnt, ein Rechteckimpuls (CNE) mit der zweiten Polarität an sämtliche sogenannten Nuraufrechterhaltungselektroden (E1 bis E4) angelegt wird, derart, daß für die nicht gelöschten Bildelemente (PX1 bis PX16) Aufrechterhaltungsentladungen erzeugt werden.
  6. Steuerverfahren gemäß Anspruch 5, dadurch gekennzeichnet, daß der Rechteckimpuls (CNE) mit der zweiten Polarität vor dem oder im wesentlichen in dem Zeitpunkt (t9) endet, der mit dem Zeitpunkt (t10) übereinstimmt, in dem der Löschimpuls (IE, IE') beginnt.
  7. Steuerverfahren gemäß einem der Ansprüche 4 oder 5 oder 6 , dadurch gekennzeichnet, daß es darin besteht, daß in dem Zeitpunkt (t12), in dem der Schreib-Basisrechteckimpuls (CBi) endet und in dem die an sämtliche Adressierungs- und Aufrechterhaltungselektroden (Y1 bis Y4) angelegte Spannung (VY) invertiert wird und die zweite Polarität annimmt, an sämtliche sogenannten Nuraufrechterhaltungselektroden (E1 bis E4) eine Spannung (VE) mit der ersten Polarität angelegt wird, derart, daß zwischen den beiden Elektroden (Y2, E2) des betreffenden Elektrodenpaares (P1 bis P4) auf Höhe eines jeden Bildelementes (PX1 bis PX16), das beschrieben worden ist, eine Auffrischungsentladung erzeugt wird.
  8. Steuerverfahren gemäß einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die an die Nuraufrechterhaltungselektroden (E1 bis E4) angelegten Impulse (CEe, CNe, CME) eine Amplitude (VE) besitzen, die kleiner als die Amplitude (VY1, VY2) der an die Adressierungs- und Aufrechterhaltungselektroden (Y1 bis Y4) angelegten Impulse (CEY, CBe, CBi) ist.
  9. Steuerverfahren gemäß einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die an die Nuraufrechterhaltungselektroden (E1 bis E4) angelegten Impulse (CNE, CEe) stets dieselbe Amplitude besitzen.
EP89402281A 1988-08-26 1989-08-11 Zeile-pro-Zeile-Ansteuerverfahren einer Plasmaanzeigetafel vom wechselspannungsbetriebenen Typ mit koplanarer Unterstützung Expired - Lifetime EP0357485B1 (de)

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FR8811247A FR2635901B1 (fr) 1988-08-26 1988-08-26 Procede de commande ligne par ligne d'un panneau a plasma du type alternatif a entretien coplanaire
FR8811247 1988-08-26

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EP0357485A1 (de) 1990-03-07
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DE68907538T2 (de) 1994-01-20
FR2635901A1 (fr) 1990-03-02
US5075597A (en) 1991-12-24

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