EP0907945B1 - Verfahren zum aktivieren von bildschirmzellen und anzeigegerät zur durchführung dieses verfahrens - Google Patents

Verfahren zum aktivieren von bildschirmzellen und anzeigegerät zur durchführung dieses verfahrens Download PDF

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Publication number
EP0907945B1
EP0907945B1 EP97930576A EP97930576A EP0907945B1 EP 0907945 B1 EP0907945 B1 EP 0907945B1 EP 97930576 A EP97930576 A EP 97930576A EP 97930576 A EP97930576 A EP 97930576A EP 0907945 B1 EP0907945 B1 EP 0907945B1
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EP
European Patent Office
Prior art keywords
solenoid
activation
main current
voltage
current
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EP97930576A
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English (en)
French (fr)
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EP0907945A1 (de
Inventor
Philippe Thomson-Csf S.C.P.I. Zorzan
André Thomson-CSF S.C.P.I. DUNAND
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Thales SA
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Thales 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
    • G09G3/296—Driving circuits for producing the waveforms applied to the driving electrodes
    • 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
    • G09G3/297—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 opposed discharge type panels

Definitions

  • the present invention relates to a method for activating cells forming the elementary image points of a display screen image. It advantageously applies in cases where the activation of cells requires the supply of a short duration current of high intensity.
  • the invention also relates to an image display device using this process.
  • Activating the cells of a display screen requires the supply of a current of intensity all the higher, as the number of cells to activate simultaneously is large.
  • PAP plasma panel screens of which activation of cells requires a large current, and more particularly plasma panels (abbreviated as "PAP") of the type alternative which all implement the "memory effect”
  • PAP plasma panel screens of which activation of cells requires a large current, and more particularly plasma panels (abbreviated as "PAP") of the type alternative which all implement the "memory effect”
  • PAPs plasma panels
  • the PAP includes a network of electrodes Y1 to Y4 called “line electrodes”, crossed with a second network of electrodes X1 to X4 called column electrodes. At each intersection of line electrodes and column corresponds to a cell C1 to C16. These cells are thus arranged along lines L1 to L4 and columns.
  • Each line electrode Y1 to Y4 is connected to an output stage SY1 to SY4 of a line 2 control device, and each electrode column X1 to X4 is connected to an output stage SX1 to SX4 of a command column 3.
  • the operations of these two control 2, 3 are controlled by an image management device 4.
  • the line 2 control device includes a so-called generator “maintenance” 5, responsible for producing cell activation signals called “service signals” SE.
  • the maintenance generator 5 delivers the maintenance signals SE by an output circuit 6, which itself distributes them to each output stage SY1 to SY4, so that these signals SE are applied simultaneously to all line electrodes Y1 to Y4.
  • the "memory effect” is used using the SE maintenance signals, to activate cells C1 to C16 which are in the state “on”, that is to say cause in these cells discharges and therefore light emissions, without changing their "on” state, or changing the state cells that are in the "extinct” state.
  • the line control device 2 generally comprises elements (not shown) which cooperate with the line output stages SY1 to SY4 for, when addressing a given line L1 to L4, superimpose to the maintenance signals SE signals specific to the addressing, and this only for line electrode Y1 to Y4 which corresponds to line L1 to L4 addressed.
  • Figure 2a shows the SE maintenance signals
  • Figure 2b illustrates the phase relationship, between the current calls debited by the line 2 control device and maintenance signals SE.
  • the SE maintenance signals consist of slots of successive voltage with a period P of the order of for example 8 to 10 microseconds.
  • the reference potential Vo is applied to the electrodes columns X1 to X4, so that the maintenance signals SE develop alternately across cells C1 to C16 positive and negative, 150 volts in the example, each of which generates a discharge in the cells which are in the "on" state.
  • Capacitive current 1c
  • This overall capacity of the PAP is constituted by different parasitic and other capacities presented in particular by the screen 1 itself, which are formed for example by the line electrodes and columns Y1 to Y4 and X1 to X4, the printed circuit tracks, and the various connections and circuits, plus the parasitic capacitances presented by the elements responsible for developing the maintenance signals SE in the line 2 control device.
  • the global capacity c PAP can have a value of 10 nF in the case of a screen 1 having 4 or 5 dm 2 , having for example 512 row electrodes and 512 column electrodes which 512 x 512 cells are established.
  • the value of the overall capacity c PAP depends very much on the technologies used.
  • the discharge current ID corresponds to the sum of the currents consumed simultaneously by the discharges of all cells which are in the "on" state. Its intensity can therefore vary significantly.
  • the maximum intensity I1 of the discharge current ID in the case of a screen having 512 row electrodes and 512 column electrodes, can reach a considerable value, of 10 amps for example, value which also depends on the technologies used.
  • the maintenance generator 5 includes a voltage source negative 7 and a positive voltage source 8, which respectively deliver the negative voltages V1 and positive V2 corresponding to the potentials of negative and positive steps p-, p + of the SE maintenance signals.
  • the voltage sources 7, 8 are connected to a common point Pc each via a switch element 10, 11.
  • These elements switches are for example constituted by MOS type transistors, allowing in a very short time, to pass from a "closed” or “passing” state in which they close the circuit, in an "open” or “blocked” state in which they open the circuit.
  • the switching elements 10, 11 are controlled from a clock device 13, by which they are put in the "on” state or at "blocked” state.
  • the maintenance signals SE are transmitted to the output circuit 6, from which they are distributed to each of the output stages SY1 at SY4.
  • the discharges in the different cells C1 to C16 are occur almost simultaneously, so that the current of discharge ID is established and reaches its maximum intensity I1 in a very short time short, for example of the order of 100 to 150 nanoseconds.
  • Voltage sources 7, 8 fail to deliver with the required qualities, the voltages V1, V2 nor the discharge current ID under which these voltages are delivered. This is due in particular to the resistances internal voltage sources 7, 8, internal resistances which are far from being negligible even for technical voltage sources particularly sophisticated, as is the case with those that are commonly used to perform the functions of sources 7, 8.
  • the maintenance generator 5 cannot always deliver the maintenance signals under a current established in a sufficiently short time not to not harm the physical phenomenon of discharge in cells.
  • EP-A-0 704 834 discloses a process activation of the cells of a display screen consisting in producing cyclically activating signals to cells. When the cells are when activated, they consume a discharge current. A solenoid cooperates in the production of activation signals. It establishes in the solenoid a capacitive current which is zero at the instants when the discharge current is established.
  • One of the aims of the present invention is to reduce or even reduce eliminate the voltage and current supply faults of the cells, and more particularly faults linked to generator deficiencies producing the activation signals of the cells, i.e. the signals maintenance in the case of a PAP.
  • the invention proposes to supply cells using a solenoid, so as to provide a source of current more suitable than conventional maintenance generators, to provide currents of very short duration and very high intensity.
  • the invention relates to a method for activating cells of a image display screen, consisting of producing cyclically signals called “activation signals” and to apply them to cells, signals having a period during which they generate at least one cell activation phase, resulting in consumption of a current called “discharge current” by activated cells, a solenoid, cooperating in the production of activation signals, the method being characterized in that to produce the activation signals, it consists of take signals at the terminals of the solenoid resulting from the application of minus a voltage to the solenoid, and in that it consists in growing and decrease in the solenoid, a current called main current which at at least part, during the decrease of said main current, constitutes the discharge current consumed by the activated cells.
  • FIG. 3 schematically represents a device for image display according to the invention, making it possible to supply cells to activate them according to the method of the invention.
  • the display device is an alternative plasma or PAP panel, similar to the conventional PAP shown in Figure 1, except for the line control device.
  • the PAP of the invention includes a display screen 1 similar to that shown in Figure 1, as well as a control device line 2A, a column 3 control device and a management device image 4 which are organized around screen 1, in the same way as in the case of the prior art already explained with reference to FIG. 1.
  • the line control device 2A of the invention comprises a activation signal generator 20, by which the signals are produced activation or maintenance signals SE, and which delivers them to the output stages SY1 to SY4 of the line 2A control device.
  • the generator signals 20 includes an SL solenoid, responsible for delivering the current ID discharge consumed by activated cells C1 to C16.
  • the signal generator 20 further comprises a first voltage source 21, whose negative output "-" is connected to a reference potential Vo which is the mass in the example, so that deliver by its output "+” a positive voltage V2 of 150 volts for example.
  • This "+” output is connected via a first element of S1 switching fulfilling a switch function, at a point which constitutes the output 22 of the signal generator 20, output 22 by which this the latter delivers the SE maintenance signals.
  • a first diode D1 is connected in parallel on the first switching element S1 or first switch S1, with the anode on the side of the output 22 and its cathode to the first voltage source 21.
  • a second switching element or second switch S2 has one end connected to the output point 22, and its other end is connected to the negative output V- of a second source voltage 23 whose positive output "+" is connected to ground.
  • the negative voltage V- has a value for example of 150V.
  • a second diode D2 is mounted in parallel with the second switch S2, the anode and the cathode of this second diode D2 being respectively connected to the second voltage source 23 and to the output point 22.
  • the first and second switches S1, S2 are of a type similar to switching elements 10, 11 used in the generator 5 shown in Figure 1. They are ordered to be put in either a "on” state in which they close the circuit, ie in a "blocked” state in which they open the circuit. These switches S1, S2 are controlled by a clock circuit H1 in itself conventional, delivering so cyclic signals controlling the "on” or "blocked” state of the switches S1, S2, according to the operation which is described below.
  • the principle of operation is to use a solenoid as a current generator.
  • a current IL called "main current” linearly between zero and a value of intensity Imax, of value at least equal to the discharge current ID.
  • Imax a value of intensity
  • the energy in the solenoid is practically 1/2 L.
  • ImaX 2 L being the value of the solenoid SL
  • the main current IL seeks to circulate by all possible paths. It will therefore naturally circulate through the cells in the "on" state of screen 1 at the time of discharge and thus allow the ignition of these cells.
  • Figures 4a to 4g constitute a timing diagram which illustrates the operation explained above.
  • FIG. 4a represents the voltage signals developed at the terminals of the solenoid SL, that is to say presented at the output point 22 and which constitute the SE maintenance signals.
  • Figure 4b shows the evolution over time of the current main IL in the solenoid SL.
  • FIG. 4c represents the conduction in the first diode D1.
  • FIG. 4d represents the conduction of the first switch S1.
  • Figure 4e shows the discharge current ID by peaks IDa, IDb which illustrate the reversal of the direction of the discharge current during two consecutive discharges.
  • FIG. 4f represents the conduction by the second diode D2.
  • Figure 4g shows the conduction by the second switch S2.
  • the first switch S1 is set to "on" and the positive voltage V2 delivered by the first source 21 is applied to the point output 22.
  • the maintenance signals SE are at the value of the positive voltage V2 in a phase which corresponds to a part of positive bearing p +, and on the other hand that the main current IL believes linearly with a slope equal to V2 / L, with a first direction of circulation IL1.
  • the clock circuit H1 commands the setting to the state "blocked" of the first switch S1. Consequently the first source of tension 21 is no longer connected to the exit point 22 nor to the solenoid SL, and therefore the positive voltage V2 is no longer applied to the solenoid.
  • the solenoid SL is connected to the output negative V- of the second voltage source 23 directly by the second switch S2: the main current IL in the solenoid begins to grow in the second direction of circulation IL2 and continues to evolve linearly up to the intensity value Imax-, with a slope equal to V- / L on the other hand, the application of the negative voltage V- at the output point 22, performs the second part of the negative bearing p- maintenance signals SE.
  • the second switch S2 is set to the state "blocked", that is to say that it opens the circuit, the negative voltage V- is no longer applied.
  • the circuit boils down to an oscillating circuit L - c PAP; we have again oscillation type voltage variation on signal voltage SE maintenance, variation whose amplitude is limited this time to the value of the positive voltage V2, by the conduction of the first diode D1 which fills a clipping function.
  • This variation in voltage this time constitutes a positive transition p +, which leads the maintenance signals to pass from the level negative p- at a positive level p +.
  • the end of application of the negative voltage V- at time t4 causes the end of the growth of this the latter with a linear slope substantially equal to that of its growth.
  • discharges occur in cells C1 to C16, discharges which are shown in FIG. 4e by an IDb peak, representing a discharge current globally consumed by the cells in the "on" state.
  • This discharge current supplied by the solenoid SL at the beginning of the decrease of the main current IL constitutes a part of this last whose importance is a function of the number of cells C1 to C16 in which produces a discharge.
  • this current of discharge IDb has a direction opposite to that of the discharge current IDa intervened at time t2 after the establishment of the negative plateau p- of the signals SE maintenance.
  • the time interval formed between instants t4 and t5 thus constitutes a second activation phase.
  • the main current IL in the solenoid is canceled, and the first diode D1 stops driving; the first switch S1 is put in the "passing" state. Therefore from time t6, the positive voltage V2 is applied by the first switch S1 to the solenoid SL, and the current principal IL in the latter continues to evaluate linearly, i.e. it begins to increase again until the intensity value Imax +. It is to highlight that applying the positive voltage V2 to the solenoid and therefore to the point of output 22, performs the second part of the positive plateau p + of the signals SE maintenance.
  • sequences between time to and time t6 describe a complete operating cycle, showing variations in current main IL in the solenoid SL, as well as the voltage variations developed at the terminal of the latter, and showing the realization of the signals SE maintenance. These sequences are repeated in the same way in the following operation, the instant t6 constituting the instant to of a following cycle.
  • the growth of the current main IL which constitutes an energy storage in the solenoid SL, takes place in a time which in the example is of the order of half of the duration of a positive or negative plateau p +, p-, a little less than a quarter of period P of the maintenance signals SE, that is to say of the order of 2 microseconds.
  • the voltage sources 21, 23 can supply voltage and current without problems, and can therefore be incorporated with ordinary technology, and therefore less expensive than in art previous, where the current consumed during discharges must be delivered in a time of the order of 10 times shorter, or about 200 nanoseconds.
  • the intensity value Imax + or Imax- of the main current IL in the solenoid is determined to meet two criteria, one of which is that it is large enough to allow the current to be supplied ID discharge through cells C1 to C16.
  • the discharge current to be supplied is of the order of 10 ampere peak.
  • the other criterion for determining the intensity of the Imax value is that this value must allow a transition Tn, Tp of the signals SE maintenance quick enough.
  • the solenoid behaves like a generator of an intensity current Imax which discharges the capacity c PAP.
  • one or other of the sources positive and negative supply 21, 23 could be replaced by a capacity fulfilling a function of reservoir of electrical charges.
  • this negative voltage V- can be obtained also by replacing the voltage source 23 with a so-called cS capacitance storage, worth for example 20 microfarads.
  • the currents la and Ib which in the operation described above circulate alternatively, the first through the second diode D2 and the second through the second switch S2, create a negative voltage by bringing and pulling charges at the capacitor cS which stores these charges. Balance is obtained (mean value of V- constant) when the quantity of loads stored in one direction (la) is equal to that taken from the other direction (Ib).
  • Figures 5a and 5b illustrate a case in which the signals have a duty cycle other than 1, and in which the negative voltage V- is obtained with a storage capacity cS.
  • Figure 5a shows the main current IL in the solenoid SL. This current varies between the Imax + value and the Imax- value, both else of the value O.
  • FIG. 5b represents the maintenance signals SE, the positive steps p + are longer than negative steps p-.
  • the bearings positive p + correspond to the positive voltage V2, and the negative p-correspond at the negative voltage V-.
  • FIG. 6 represents the activation signal generator 20 already shown in Figure 3, in a version producing the current IL in the solenoid under the same conditions as those explained with reference in FIGS. 3 to 5, but making it possible to produce maintenance signals SE whose negative bearings p- are at ground potential.
  • the reference potential is no longer mass, but it is constituted by the positive potential of the voltage VA, and that mass is the most negative potential.
  • the positive potential to build positive bearings p + of maintenance signals SE is obtained using a cS2 capacity, by balancing the quantities of charges transported, according to a operation of the same type as those already explained in the case where the negative voltage V- is obtained using the first storage capacity CS1.
  • the positive voltage V3 could also be obtained replacing cS2 storage capacity with a voltage source classic.
  • FIG. 7 represents the maintenance signals obtained with the assembly described with reference to figure 6.
  • the maintenance signals SE are constituted by voltage slots, established on either side of a reference potential which is the potential of the positive voltage Va; that the negative bearings p- are at the potential of the mass, and that the positive steps p + are at the potential of the positive voltage V3.
  • FIG. 8 schematically represents another mode of realization of the activation signal generator 20 of the invention, allowing an operation similar to that described with reference in Figures 3 and 4a to 4g, and also making it possible to provide intervals time during which the main current IL in a solenoid SL ' keeps a zero value. So by reducing the time when there is passage of current IL in the solenoid and in the assembly as a whole, the losses inherent in the passage of this current through the various elements of the mounting.
  • the generator signals 20 shown in Figure 8 additionally includes a third and a fourth diodes D2, D4, as well as a third and a fourth elements of switching or switches S3, S4 whose "on" state or "blocked” state are controlled by the H1 clock.
  • the end of the solenoid SL ' opposite the exit point 22, is connected to both the cathode of the third diode D3 and at the anode of the fourth diode D4.
  • the anode of the third diode D3 is connected to one end of the third switch S3, the other end of which is connected to ground.
  • the cathode of the fourth diode D4 is connected to one end of the fourth switch S4, the other end of which is connected to ground.
  • the solenoid SL ' cannot be effectively connected to ground only when at least one of the third and fourth switches S3, S4 is in the "on" state and, that also the third or fourth diode D3, D4 in series with this switch, either mounted with the direction of conduction suitable for conducting the main current IL, current which it is recalled that it can have two opposite directions of circulation, in the same period.
  • a lower value solenoid for example 20 microHenry instead of 30 microHenry, for the same values of the applied voltages, allows reduce both the time it takes for the mainstream IL to go from its maximum intensity value Imax + or Imax-, at its zero value, as well as the time it takes to then increase to its value maximum intensity.
  • the value of the solenoid SL gives the growth of the main current IL, a duration substantially equal to half that of a positive plateau or negative p +, p-. Going from a value of 30 microHenry to a value of 20 microHenry, the current growth time is reduced by about 1/3. It is this difference in duration which is used to make the intervals time at zero current. This can be applied to the examples of Figures 3, 4a to 4g, 5, 6 and 7, without modifying the length of the positive and negative steps p +, p- which form the SE maintenance signals nor reduce the intensity values maximum Imax +, Imax-.
  • the first and fourth switches S1, S4 are put in the "passing" state.
  • the main current IL which was at zero, begins to grow in the first direction IL1 of traffic (with a slope V2 / L 'more faster than V2 / L, L 'being the value of the solenoid SL') towards its value Imax + that it will reach at time t1 when the first switch S1 goes to the state "blocked".
  • the fourth diode D4 leads.
  • the main current IL reaches the value zero (more quickly than in the case of FIG. 4b, because of the lower value of the solenoid SL 'in the present example).
  • the second and fourth diodes D2, D4 stop driving.
  • the third switch S3 is set to "blocked", this has the effect of somehow disconnect the solenoid SL 'from the ground, in such a way that, even when controlling the "on" state of the second switch S2, one cannot can impose a growth (in negative) of the current IL which thus preserves a null value as long as S3 is blocked. We thus obtain the beginning of a first time interval T1 at zero current.
  • the second and the third switches S2, S3, and the main current IL begins to increase according to the second direction IL2 of circulation with a slope equal to V- / L '.
  • the third diode D3 leads.
  • the second switch S2 is "blocked"; the flow main IL has reached its Imax- value.
  • the voltage of the maintenance signals SE undergoes a Tp transition which leads to a corresponding positive p + plateau substantially at the value V2 of positive voltage.
  • the first diode D1 becomes conductive.
  • the main current IL begins to decrease.
  • the invention has been described with reference to a plasma panel alternative, of the type having only two crossed electrodes to define a cell and control its operation, but the invention can be applied as well to all types of alternative plasma panels, and it can also apply to other types of image viewing screens from when the activation of their cells requires a current of character impulse, and that these screens have a capacity such that the overall capacity c PAP presented by a plasma panel.

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  • Power Engineering (AREA)
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  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
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Claims (42)

  1. Verfahren zur Aktivierung von Zellen (C1 bis C16) eines Bildschirms (1) mit einer zyklischen Erzeugung von Aktivierungssignalen (SE) und ihrer Zuführung zu den Zellen (C1-C16), wobei die Signale eine Periode (P) aufweisen, während der sie wenigstens eine Aktivierungphase der Zelle (C1-C16) bewirken, die zu einem Verbauch eines Entladestroms (ID) durch die aktivierten Zellen führt, wobei eine Zylinderspule (SL, SL') bei der Erzeugung der Aktivierungssignale (SE) mitwirkt,
    dadurch gekennzeichnet, daß
    für die Erzeugung der Aktivierungssignale (SE) von den Anschlußklemmen der Zylinderspule (SL, SL') Signale abgeleitet werden, die aus der Zuführung wenigstens einer Spannung (V2) zu der Zylinderspule (SL, SL') resultieren, und daß in der Zylinderspule (SL, SL') ein Hauptstrom (IL) entsteht, von dem wenigstens ein Teil im Laufe der Abnahme des Hauptstroms den Entladestrom (ID) bildet, der durch die aktivierten Zellen (C1-C16) verbraucht wird.
  2. Verfahren zur Aktivierung nach Anspruch 1, dadurch gekennzeichnet, daß an von Anschlußklemmen der Zylinderspule (SL, SL') Signale abgeleitet werden, die aus den aufeinanderfolgenden Zuführungen einer positiven Spannung (V2) und einer negativen Spannung (V-) gegenüber einer Referenzspannung (Vo) resultieren, mit der die Zylinderspule (SL, SL') verbunden ist.
  3. Verfahren zur Aktivierung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß der Hauptstrom (IL) bis zu einem maximalen Intensitätswert (Imax+, Imax-) ansteigt, der wenigstens gleich einer Maximalintensität des Entladestroms (ID) ist.
  4. Verfahren zur Aktivierung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß der Hauptstrom (IL) derart gebildet wird, daß die Abnahme in diesem Strom vor oder in derselben Zeit wie eine Aktivierungsphase der Zellen (C1-C16) beginnt.
  5. Verfahren zur Aktivierung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß der Hauptstrom (IL) zyklisch mit einer Periode (P) ausgebildet ist, die gleich der Periode (P) der Aktivierungssignale (SE) ist.
  6. Verfahren zur Aktivierung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß in einer Periode (P') des Hauptstroms (IL) der Hauptstrom bis zu einer Maximalintensität (Imax+, Imax-) ansteigt und dann zunächst mit einer ersten Flußrichtung (IL1) abfällt und in einer zweiten Zeit mit einer zweiten, zur ersten entgegengesetzten Flußrichtung (IL2) ansteigt.
  7. Verfahren zur Aktivierung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß vor jeder Zunahme der Hauptstrom (IL) einen Nullwert durchläuft.
  8. Verfahren zur Aktivierung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß der Hauptstrom (IL) einerseits so ausgebildet ist, daß jede Zunahme in diesem Strom einer Aktivierungsphase der Zellen (C1-C16) entspricht und dieselbe Flußrichtung (IL1, IL2) des Stroms wie die Flußrichtung (ID1, ID2) des entsprechenden Entladestroms (ID) aufweist, und andererseits jede Abnahme in dem Hauptstrom (IL) vor oder gleichzeitig mit der entsprechenden Aktivierungsphase beginnt.
  9. Verfahren zur Aktivierung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß dem Hauptstrom (IL) während eines Zeitintervalls (t2'-t3') am Ende einer Abnahme und dem Start der nächsten Zunahme ein Nullwert zugeteilt wird.
  10. Verfahren zur Aktivierung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß für die Zunahme des Hauptstroms (IL) eine Spannung (V2, V-) an die Zylinderspule (SL, SL') angelegt wird und dann durch Beseitigung der Anlegung dieser Spannung die Abnahme des Hauptstroms bewirkt wird.
  11. Verfahren nach einem der Ansprüche 2 bis 10, dadurch gekennzeichnet, daß ein erstes Ende der Zylinderspule (SL; SL') an die Referenzspannung (V0) angeschlossen und das zweite Ende der Zylinderspule (SL, SL') an einen Ausgangspunkt (22) angeschlossen wird, wo die Aktivierungssignale (SE) geliefert werden und von wo sie zu den Bildschirm (1) übertragen werden.
  12. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß, um den Aktivierungssignalen (SE) eine allgemeine Form von Spannungsstößen zu geben, die durch eine erste und eine zweite Stufe (t+, t-) mit entgegengesetzter Polarität gebildet sind, die abwechselnd aufeinanderfolgen, folgendes erfolgt:
    Zuführung der positiven Spannung (V2), die der Spannung einer ersten Stufe (p+) der Aktivierungssignale (SE) entspricht, zu der Zylinderspule (SL), um die Zunahme in dem Hauptstrom (IL) in einer ersten Flußrichtung (IL1) zu bewirken,
    dann bei einem Zeitpunkt, der dem Ende der ersten Stufe (p+) entspricht eine Beendigung der Zuführung dieser positiven, Spannung (V2) derart, daß einerseits das Ende der Zunahme in dem Hauptstrom (IL) und andererseits eine Änderung (Tn) in der Spannung über der Zylinderspule (SL) erfolgt, erzeugt durch ein Ansprechverhalten einer Oszillatorschaltung (SL-c PAP) aus der Zylinderspule (SL, SL') mit einer durch den Bildschirm (1) bewirkten Gesamtkapazität (c PAP),
    dann Begrenzung der Änderung (Tn) der Spannung auf einen Wert, der der zweiten Stufe (p-) der Aktivierungssignale (SE) entspricht.
  13. Verfahren zur Aktivierung nach Anspruch 12, dadurch gekennzeichnet, daß dann, wenn die Abnahme in dem Hauptstrom (IL) mit der ersten Flußrichtung (IL1) beendet ist:
    Zuführung der negativen Spannung (V-) entsprechend der Spannung der zweiten Stufe (p-) der Aktivierungssignale (SE) zu der Zylinderspule, so daß der Hauptstrom (IL) in einer zweiten Flußrichtung (IL2) zunimmt,
    dann, in einem Zeitpunkt, der dem Ende der zweiten Stufe (p-) entspricht, Beendigung der Zuführung der negativen Spannung (V-), um einerseits das Ende der Zunahme in dem Hauptstrom (IL) und andererseits eine Änderung (Tp) in der Spannung über der Zylinderspule (SL) zu bewirken, die durch ein Schwingverhalten der Oszillatorschaltung (SL-c PAP) erzeugt wird,
    dann Begrenzung dieser Änderung (Tp) der Spannung auf einen Wert, der der Spannung (V2) der ersten Stufe (p+) entspricht.
  14. Verfahren zur Aktivierung nach einem der Ansprüche 11 oder 12 oder 13, dadurch gekennzeichnet, daß die positive Spannung (V2) und die negative Spannung (V-) mittels eines ersten bzw. eines zweiten Schaltelementes (S1, S2) an die Zylinderspule (SL, SL') angelegt werden, an deren Anschlußklemmen eine erste bzw. eine zweite sogenannte Begrenzungsdiode (D1, D2) angeschlossen sind, und jede Begrenzungsdiode (D1, D2) derart orientiert ist, daß sie einen sogenannten Begrenzungsstrom (Ib) mit einer Flußrichtung führt, die entgegengesetzt ist zu der des Stroms (1a), der durch das Schaltelement (S1, S2) fließt,. zu dem es gehört.
  15. Verfahren zur Aktivierung nach Anspruch 14, dadurch gekennzeichnet, daß zur Bildung der positiven Spannung oder der negativen Spannung (V2, V-) eine Spannung verwendet wird, die über einer sogenannten Speicherkapazität entsteht durch einerseits den Fluß des Begrenzungsstroms (Ib) über eine Begrenzungsdiode (D1, D2) und andererseits durch den Fluß des Stroms (1a) über das entsprechende Schaltelement (S1, S2).
  16. Verfahren zur Aktivierung nach einem der Ansprüche 2 bis 14, dadurch gekennzeichnet, daß die Referenzspannung (V0) dem Erdpotential entspricht.
  17. Verfahren zur Aktivierung nach einem der Ansprüche 2 bis 14, dadurch gekennzeichnet, daß die Erde dem Potential der negativen Spannung (V-) entspricht.
  18. Verfahren zur Aktivierung nach Anspruch 17, dadurch gekennzeichnet, daß die positive Spannung (V2) mittels einer Speicherkapazität (cS) gewonnen wird.
  19. Verfahren zur Aktivierung nach einem der Ansprüche 2 bis 18, dadurch gekennzeichnet, daß die positive und die negative Spannung (V2, V-) derart an die Zylinderspule (SL, SL') angelegt werden, daß die Aktivierungssignale (SE) ein Tastverhältnis gleich 1 annehmen.
  20. Verfahren zur Aktivierung nach einem der Ansprüche 2 bis 18, dadurch gekennzeichnet, daß die positive und die negative Spannung (V2, V-) derart angelegt werden, daß die Aktivierungssignale (SE) ein von 1 abweichendes Tastverhältnis annehmen.
  21. Verfahren zur Aktivierung nach einem der vorangehenden Ansprüche, wobei die Aktivierungssignale (SE) mit einer allgemeinen Form von Rechteckimpulsen ausgebildet sind, die durch zwei Stufen (p+, p-) entgegengesetzter Polarität gebildet sind, dadurch gekennzeichnet, daß die Zunahme des Hauptstroms (IL) mit einer derartigen Steigung (V2/L, V-/L) erfolgt, daß diese Zunahme es ermöglicht, einen gewünschten maximalen Intensitätswert (Imax+, Imax-) in einer Zeit zu erreichen, die kürzer ist als die Dauer einer Stufe (p+, p-).
  22. Verfahren zur Aktivierung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß während der Intervalle (t0' bis t1) zwischen einer Abnahme und einer darauffolgenden Zunahme des Hauptstroms (IL) letzterer einen Nullwert annimmt.
  23. Verfahren zur Aktivierung nach Anspruch 22, dadurch gekennzeichnet, daß die Zylinderspule (SL') von dem übrigen Teil der Schaltung über wenigstens eines ihrer Enden während der Zeitintervalle (T1, T2) isoliert ist, in denen der Hauptstrom (IL) einen Nullwert aufweist.
  24. Verfahren zur Aktivierung nach einem der vorangehenden Ansprüche, wobei die Aktivierungssignale (SE) mit einer im allgemeinen impulsartigen Form versehen sind, die durch zwei Stufen (p+, p-) entgegengesetzter Polarität gebildet ist, dadurch gekennzeichnet, daß die Zunahme des Hauptstroms (IL) mit einer derartigen Steigung (V2/L', V-/L') erfolgt, daß diese Steigung es ermöglicht, einen gewünschten maximalen Intensitätswert (Imax+, Imax-) in einer Zeit zu erlangen, die kleiner ist als die Dauer der Hälfte einer Stufe (p+, p-) der Signale (SE).
  25. Verfahren zur Aktivierung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß der Bildschirm (1) ein Plasmabildschirm vom Wechselspannungstyp ist.
  26. Bildwiedergabevorrichtung mit Anwendung des Verfahrens nach einem der Ansprüche 1 bis 25 mit:
    einem Wiedergabebildschirm (1), der mehrere Zellen (C1-C16) aufweist und eine Gesamtkapazität (c PAP) darstellt,
    einer Steuereinheit (2a) zur Lieferung der Aktivierungssignale (SE), deren Zuführung zu den Zellen (C1-C16) in zyklischer Weise eine Aktivierung der letzteren erzeugt, was einen Verbrauch eines Entladestroms (ID) durch die aktivierten Zellen (C1-C6) bewirkt, wobei die Steuereinheit (2a) eine Zylinderspule (SL, SL') enthält, die mit den Umschaltmitteln (S1, S2, D1, D2) und mit wenigstens einer Spannungsquelle (21) zusammenarbeitet, dadurch gekennzeichnet, daß die Steuermittel (2a) an den Anschlußklemmen der Zylinderspule (SL, SL') Signale erzeugen, die zur Bildung der Aktivierungssignale (SE) dienen und in der Zylinderspule (SL, SL') einen zunehmenden und abnehmenden Hauptstrom (IL) bilden, der im Zeitpunkt seiner Abnahme zur Bildung des durch die aktivierten Zellen verbrauchten Entladestroms (ID) dient.
  27. Wiedergabevorrichtung nach Anspruch 26, dadurch gekennzeichnet, daß die Umschaltmittel (S1, S2, D1, D2) ein erstes Schaltelement (S1) enthalten, das mit einer Taktschaltung (H1) zusammenarbeitet, um der Zylinderspule (SL,SL') eine relativ zu einer Referenzspannung (V0) positive Spannung (V2) zuzuführen, die der Spannung einer positiven Stufe (p+) der Aktivierungssignale (SE) entspricht.
  28. Wiedergabevorrichtung nach Anspruch 27, dadurch gekennzeichnet, daß die Zuführung der positiven Spannung (V2) die Zunahme des Hauptstroms (IL) mit einer ersten Flußrichtung (IL1) bewirkt.
  29. Wiedergabevorrichtung nach einem der Ansprüche 27 bis 28, dadurch gekennzeichnet, daß die Steuereinheit (2a) eine Abschneideschaltung (D2) enthält, die bei dem Wert der Spannung (V-) einer negativen Stufe (p-) der Aktivierungssignale (SE) einen Spannungsübergang (Tn, Tp) an den Anschlußklemmen der Zylinderspule (SL, SL') nach der Entfernung der Zuführung der letzteren der positiven Spannung (V2) begrenzt.
  30. Wiedergabevorrichtung nach einem der Ansprüche 27 bis 29, dadurch gekennzeichnet, daß ein zweites Schaltelement (S2) mit der Taktschaltung (H1) zusammenarbeitet, um der Zylinderspule (SL, SL') relativ zu einer Referenzspannung (Vo) eine negative Spannung (V-) zuzuführen, die der Spannung einer negativen Stufe (p-) der Aktivierungssignale (SE) entspricht.
  31. Wiedergabevorrichtung nach Anspruch 30, dadurch gekennzeichnet, daß die Zuführung der negativen Spannung (V-) die Zunahme des Hauptstroms (IL) in einer zweiten Flußrichtung (IL2) bewirkt.
  32. Wiedergabevorrichtung nach Anspruch 31, dadurch gekennzeichnet, daß die Steuereinheit (2) eine zweite Abschneideschaltung (V2, D1) enthält, die bei dem Wert der- Spannung (V2) der positiven Stufe (p+) einen Spannungsübergang (Tp) über den Zylinderspulen (SL, SL') begrenzt, der aus der Beseitigung der Zuführung der negativen Spannung (V-) zu der Zylinderspule (SL, SL') resultiert.
  33. Wiedergabevorrichtung nach einem der Ansprüche 30 bis 32, dadurch gekennzeichnet, daß die Zuführung der positiven oder negativen Spannung (V2, V-) zu der Zylinderspule (L, L') unterdrückt wird, wenn der Hauptstrom (IL) im wesentlichen einen gewünschten maximalen Intensitätswert (Imax+, Imax-) erreicht.
  34. Wiedergabevorrichtung nach Anspruch 33, dadurch gekennzeichnet, daß der Wert der maximalen Intensität (Imax+, Imax-) gleich oder größer als der Wert des Entladestroms (ID) ist.
  35. Wiedergabevorrichtung nach einem der Ansprüche 30 bis 35, dadurch gekennzeichnet, daß die Zunahme des Hauptstroms (IL) mit einer derartigen Steigung (V2/L, V/L) erfolgt, daß der Hauptstrom (IL) einen gewünschten maximalen Intensitätswert (Imax+, Imax-) in einer Zeit erreicht, die im wesentlichen gleich der Hälfte der Dauer einer der Stufen (p+, p-) ist, die die Aktivierungssignale (SE) bilden.
  36. Wiedergabevorrichtung nach einem der Ansprüche 26 bis 35, dadurch gekennzeichnet, daß sie Mittel (SL', S3, S4, D3, D4) zur Aufrechterhaltung des Hauptstroms (IL) bei einem Nullwert während der Zeitintervalle zwischen einer Abnahme und einer darauffolgenden Zunahme des Hauptstroms (IL) enthält.
  37. Wiedergabevorrichtung nach Anspruch 36, dadurch gekennzeichnet, daß die Zunahme des Hauptstroms (IL) mit einer derartigen Steigung (V2/L, V-/L'), daß der Hauptstrom (IL) einen gewünschten maximalen Intensitätswert (Imax+, Imax-) in einer Zeit erreicht, die kleiner ist als die Hälfte der Dauer einer der Stufen (p+, p-), die die Aktivierungssignale (SE) bilden.
  38. Wiedergabevorrichtung nach einem der Ansprüche 36 oder 37, dadurch gekennzeichnet, daß die Steuereinheit (2a) außerdem Schaltelemente (S3, S4, D3, D4) enthält, die es ermöglichen, die Ausbildung des Hauptstroms (IL) zu verhindern.
  39. Wiedergabevorrichtung nach Anspruch 30, dadurch gekennzeichnet, daß sie eine sogenannte Speicherkapazität (cS) enthält, die entweder mit dem ersten Schaltelement (S1), an dessen Anschlußklemmen eine erste Abschneidediode (D1) angeschlossen ist, oder mit dem zweiten Schaltelement (S2), an deren Anschlußklemmen eine zweite Abschneidediode (D2) angeschlossen ist, zusammenarbeitet, um entweder die positive Spannung (V2) oder die negative Spannung (V-) zu erzeugen.
  40. Wiedergabevorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß die Referenzspannung (Vo) das Erdpotential ist.
  41. Wiedergabevorrichtung nach einem der Ansprüche 30 bis 39, dadurch gekennzeichnet, daß die Erde dem Potential der negativen Spannung (V-) entspricht.
  42. Wiedergabevorrichtung nach einem der Ansprüche 26 bis 41, dadurch gekennzeichnet, daß der Bildschirm (1) der Schirm eines Plasmaschirms vom Wechselspannungstyp ist.
EP97930576A 1996-06-28 1997-06-24 Verfahren zum aktivieren von bildschirmzellen und anzeigegerät zur durchführung dieses verfahrens Expired - Lifetime EP0907945B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9608079A FR2750525B1 (fr) 1996-06-28 1996-06-28 Procede d'activation des cellules d'un ecran de visualisation d'image, et dispositif de visualisation d'image mettant en oeuvre le procede
FR9608079 1996-06-28
PCT/FR1997/001123 WO1998000826A1 (fr) 1996-06-28 1997-06-24 Procede d'activation des cellules d'un ecran de visualisation d'image, et dispositif de visualisation d'image mettant en oeuvre le procede

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FR2812963B1 (fr) * 2000-08-11 2003-07-25 St Microelectronics Sa Procede et circuit de commande de cellules d'un ecran a plasma
US7138994B2 (en) * 2000-11-09 2006-11-21 Lg Electronics Inc. Energy recovering circuit with boosting voltage-up and energy efficient method using the same
US6917351B1 (en) * 2001-02-06 2005-07-12 Imaging Systems Technology Energy recovery in plasma display panel
US6963174B2 (en) * 2001-08-06 2005-11-08 Samsung Sdi Co., Ltd. Apparatus and method for driving a plasma display panel
FR2860634A1 (fr) * 2003-10-01 2005-04-08 Thomson Plasma Dispositif de commande d'un panneau d'affichage au plasma
KR100708692B1 (ko) * 2005-06-14 2007-04-18 삼성에스디아이 주식회사 디스플레이 패널의 구동장치
JP2007122981A (ja) * 2005-10-26 2007-05-17 Matsushita Electric Works Ltd 点灯装置及び照明装置

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US5081400A (en) 1986-09-25 1992-01-14 The Board Of Trustees Of The University Of Illinois Power efficient sustain drivers and address drivers for plasma panel
JP2770657B2 (ja) * 1992-06-09 1998-07-02 日本電気株式会社 プラズマディスプレイの駆動装置
JP2755201B2 (ja) * 1994-09-28 1998-05-20 日本電気株式会社 プラズマディスプレイパネルの駆動回路
KR100222203B1 (ko) * 1997-03-17 1999-10-01 구자홍 AC 플라즈마 디스플레이 패널을 위한 에너지 리커버리(recovery) 서스테인 회로
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FR2750525A1 (fr) 1998-01-02
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EP0907945A1 (de) 1999-04-14
DE69715202T2 (de) 2003-08-07
FR2750525B1 (fr) 1998-09-18
JP2000513459A (ja) 2000-10-10
WO1998000826A1 (fr) 1998-01-08

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