EP0706703B1 - Alternating current generator for controlling a plasma display screen - Google Patents

Alternating current generator for controlling a plasma display screen Download PDF

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Publication number
EP0706703B1
EP0706703B1 EP94922870A EP94922870A EP0706703B1 EP 0706703 B1 EP0706703 B1 EP 0706703B1 EP 94922870 A EP94922870 A EP 94922870A EP 94922870 A EP94922870 A EP 94922870A EP 0706703 B1 EP0706703 B1 EP 0706703B1
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EP
European Patent Office
Prior art keywords
voltage
capacitance
switches
switch
inductance
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EP94922870A
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German (de)
French (fr)
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EP0706703A1 (en
Inventor
Gerard Rilly
Gerard Morizot
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Deutsche Thomson Brandt GmbH
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Deutsche Thomson Brandt GmbH
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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
    • G09G3/296—Driving circuits for producing the waveforms applied to the driving electrodes
    • G09G3/2965—Driving circuits for producing the waveforms applied to the driving electrodes using inductors for energy recovery

Definitions

  • the invention relates to a generator for controlling a Plasma display screen according to the preamble of claim 1.
  • a generator is known from document 92 SID DIGEST 1987 page 92 - to 95.
  • US-A-4 070 663 describes an AC generator for an EL display. This could also be used for a plasma display screen.
  • the invention has for its object the described Modify circuit so that the ignition process for the individual Pixel for the excitation to glow is improved.
  • This Object is achieved by the invention specified in claim 1 solved.
  • Advantageous developments of the invention are in the dependent claims.
  • the well-known generator for line control works with two Voltage values of the voltage on the total capacitance.
  • Switching is made conscious between the periods the two different voltage values for the ignition and deleting another period with a third Voltage value, preferably inserted from zero to thereby the Information of the respective pixel or pixel in the plasma to delete or neutralize. Between two each different, successive voltage values a transition in the form of a sine half-wave. By the period with the third voltage value will be clear or so-called reset of the pixel significantly improved.
  • the two different sized positive and negative voltage values allow optimization of the excitation of the pixel. You can the addressing of rows and columns with relatively low ones Tensions occur that are independent of each other Control range of the plasma are precisely adjusted. The additional Addressing circuits can then get optimal voltage values.
  • the total capacity is preferably cyclically via one third switch turned on so that the voltage on the capacity between periods with a positive and a negative voltage a period with the voltage zero value having.
  • the connection of the capacitance is preferably via the Inductance and the second switch to an operating voltage and connected to earth via the third switch. It is preferably the second operating voltage is equal to half the first operating voltage.
  • An expanded solution with four transitions for both polarities is that with the first end of the inductor connected connection of the capacitance via two parallel switches with opposite direction of passage with earth, over a first switch with a positive operating voltage, via a second switch with an equally large second operating voltage connected and the second end of the inductor via two parallel switches with opposite forward direction with half the first operating voltage and two more Switch in the opposite direction with the half second operating voltage are connected.
  • the switch routes with different pass directions preferably in each case through the series connection of a switch and a diode.
  • Cp means the total plasma or panel capacity of a plasma screen, only the circuit elements are shown for the transfer of Cp between O and a positive one Voltage, not the other circuit elements for the corresponding Transfer between O and the negative voltage.
  • an additional voltage Uza is added via stage 1, which for serves the addressing of an entire line and thereby one selected line selected.
  • For the addressing process given increased tension on each line and additionally a voltage for the column addressing that is on the opposite side of Cp. Through this Row addressing and column addressing each become one pixel or pixel addressed.
  • L is the inductance used for energy recovery, in which the stored in Cp in the form of the voltage UCp Energy is recovered in the form of electricity.
  • FIG. 2 shows the time course of the voltage UCp across the capacitance Cp for a period.
  • the undressed show Lines at T1, T2, T3, during which periods the switches are controlled. It can be seen that the switch T2 in each case during the transitions, ie the reloading of Cp between O and E + is conductive.
  • T1 and T3 cause longer ones Connection of the connection a to the voltage E + during the Ignition phase or to earth during the period with the voltage value zero.
  • Fig. 1 is only for one polarity shown, i.e. only the connection to E + and earth.
  • FIG. 3 shows the expansion of the circuit according to FIG. 2 for both polarities and three voltage values according to FIG. 2.
  • E3 -V1 / 2
  • E4 + V2 / 2.
  • the circuit according to FIG. 3 essentially works on the principle of the circuit according to FIG. 1, the following list of concordances being used for a better understanding: Fig. 4 Fig. 1 T4-, D4- T2, D1 T4, D4 T2, D1 T6, D6 T2, D1 T6-, D6- T2, D1 T5-, D5- T3, D3 T5, D5 T3, D3 T1 T1 T2
  • Cp is the total capacity again.
  • the actual flow of energy takes place via T1, T2.
  • the frequency at which the transhipment takes place is about 30 to 100 kHz.
  • Fig. 5 shows an alternative solution to Fig. 3.
  • the current for the The ignition phase i.e. the excitation to glow, essentially flows via the transistors TH and TL shown as switches.
  • a particularly large plasma screen is necessary because of the higher currents also split into several current paths sensible.
  • the transfer of Cp takes place due to the structure of the Switches T1, T2; T3, T1.
  • the average voltage of Cp is only zero if the voltages V2 and V1 are symmetrical, i.e. in magnitude are the same.
  • Fig. 7 shows a variant for a plasma screen with a large Dimension.
  • the majority of the switches TH and TL for the screen transmitting energy is in two parts divided, each of which has a corresponding maintenance circuit THB-TLB is assigned.
  • This circuit shows the Possibility to use a common resonance circuit.
  • the energy present at the start of the resonance is: 1 2nd C. E 2nd 2nd .
  • the delay ⁇ is used for a suitable compensation of the Losses set so that Vp is accurate at the end of the quarter voltage E reached.

Description

Die Erfindung geht aus von einem Generator zur Steuerung eines Plasma-Wiedergabeschirms gemäß dem Oberbegriff des Anspruchs 1. Ein derartiger Generator ist bekannt durch das Dokument 92 SID DIGEST 1987 Seite 92 - bis 95.The invention relates to a generator for controlling a Plasma display screen according to the preamble of claim 1. Such a generator is known from document 92 SID DIGEST 1987 page 92 - to 95.

US-A-4 070 663 beschreibt einen Wechselspannungsgenerator für eine EL-Anzeige. Dieser könnte auch für einen Plasmawiedergabeschirm verwendet werden.US-A-4 070 663 describes an AC generator for an EL display. This could also be used for a plasma display screen.

Bei einem derartigen Plasma-Bildwiedergabeschirm stellt jeder Bildpunkt oder Pixel eine Kapazität dar. Für die Grundpolarisation der Zeilenadressierung wird eine Wechselspannung benötigt, die die Gesamtkapazität des Bildschirms periodisch lädt und entlädt, was zunächst einen beträchtlichen Energieverlust bedeutet. Zur Verringerung des Energieverlustes ist es bekannt, in den Ladeweg der Kapazität eine Induktivität einzuschalten, die im Sinne einer sogenannten Energierückgewinnung wirkt. Die Spannungsenergie an der Kapazität wird dabei periodisch in eine Stromenergie in der Spule verschoben. Auf diese Weise läßt sich eine Energierückgewinnung bis zu 90 % erreichen. Durch die Resonanzentladung kehrt die Spannung an der Kapazität ihre Polarität um. Das bedeutet, daß die Spannungsdifferenz an der Kapazität das Doppelte der angelegten Betriebsspannung ist. Diese bekannte Schaltung wird auch als Weber-Wood-Schaltung bezeichnet.With such a plasma display screen, everyone poses Pixel or pixel represents a capacitance. For basic polarization an AC voltage is required for row addressing, which periodically charges and discharges the total capacity of the screen, which initially means a significant loss of energy. It is known to reduce energy loss in the charging path the capacity to turn on an inductor, which in Meaning of a so-called energy recovery works. The tension energy the capacity is periodically divided into a Electricity energy shifted in the coil. In this way achieve energy recovery of up to 90%. Through the Resonance discharge reverses the voltage across the capacity of its polarity around. This means that the voltage difference across the capacitance is twice the applied operating voltage. This known circuit is also called Weber-Wood circuit.

Der Erfindung liegt die Aufgabe zugrunde, die beschriebene Schaltung so abzuwandeln, daß der Zündvorgang für die einzelnen Pixel für die Anregung zum Leuchten verbessert wird. Diese Aufgabe wird durch die im Anspruch 1 angegebene Erfindung gelöst. Vorteilhafte Weiterbildungen der Erfindung sind in den abhängigen Patentansprüchen angegeben.The invention has for its object the described Modify circuit so that the ignition process for the individual Pixel for the excitation to glow is improved. This Object is achieved by the invention specified in claim 1 solved. Advantageous developments of the invention are in the dependent claims.

Der bekannte Generator für die Zeilensteuerung arbeitet mit zwei Spannungswerten der Spannung an der Gesamtkapazität. Bei der erfindungsgemäßen Schaltung wird bewußt zwischen den Perioden mit den zwei unterschiedlichen Spannungswerten für die Zündung und das Löschen eine weitere Periode mit einem dritten Spannungswert, vorzugsweise von null eingefügt, um dadurch die Information des jeweiligen Pixels oder Bildpunktes in dem Plasma zu löschen oder zu neutralisieren. Jeweils zwischen zwei unterschiedlichen, aufeinanderfolgenden Spannungswerten liegt dabei jeweils ein Übergang in Form einer Sinushalbwelle. Durch die Periode mit dem dritten Spannungswert wird das Löschen oder sogenannte Reset des Pixels wesentlich verbessert. Die beiden unterschiedlich großen positiven und negativen Spannungswerte erlauben eine Optimierung der Anregung des Pixels. Dabei können die Adressierung der Zeilen und der Spalten mit relativ niedrigen Spannungen erfolgen, die unabhängig voneinander an den Steuerbereich des Plasma genau angepaßt sind. Die zusätzlichen Adressierungsschaltungen können dann optimale Spannungswerte erhalten.The well-known generator for line control works with two Voltage values of the voltage on the total capacitance. In the case of the invention Switching is made conscious between the periods the two different voltage values for the ignition and deleting another period with a third Voltage value, preferably inserted from zero to thereby the Information of the respective pixel or pixel in the plasma to delete or neutralize. Between two each different, successive voltage values a transition in the form of a sine half-wave. By the period with the third voltage value will be clear or so-called reset of the pixel significantly improved. The two different sized positive and negative voltage values allow optimization of the excitation of the pixel. You can the addressing of rows and columns with relatively low ones Tensions occur that are independent of each other Control range of the plasma are precisely adjusted. The additional Addressing circuits can then get optimal voltage values.

Vorzugsweise wird die Gesamtkapazität zyklisch über einen dritten Schalter so an Erde angeschaltet, daß die Spannung an der Kapazität zwischen Perioden mit einer positiven und einer negativen Spannung eine Periode mit dem Spannungsnullwert aufweist. Vorzugsweise ist der Anschluß der Kapazität über die Induktivität und den zweiten Schalter an eine Betriebsspannung und über den dritten Schalter an Erde angeschlossen. Dabei ist vorzugsweise die zweite Betriebsspannung gleich der Hälfte der ersten Betriebsspannung.The total capacity is preferably cyclically via one third switch turned on so that the voltage on the capacity between periods with a positive and a negative voltage a period with the voltage zero value having. The connection of the capacitance is preferably via the Inductance and the second switch to an operating voltage and connected to earth via the third switch. It is preferably the second operating voltage is equal to half the first operating voltage.

Eine erweiterte Lösung mit vier Übergängen für beide Polaritäten besteht darin, daß der mit dem ersten Ende der Induktivität verbundene Anschluß der Kapazität über zwei parallele Schalter mit entgegengesetzter Durchlaßrichtung mit Erde, über einen ersten Schalter mit einer positiven Betriebsspannung, über einen zweiten Schalter mit einer gleich großen zweiten Betriebsspannung verbunden und das zweite Ende der Induktivität über zwei parallele Schalter mit entgegengesetzter Durchlaßrichtung mit der halben ersten Betriebsspannung sowie über zwei weitere Schalter mit entgegengesetzter Durchlaßrichtung mit der halben zweiten Betriebsspannung verbunden sind. Die Schalterstrecken mit unterschiedlichen Durchlaßrichtungen werden dabei vorzugsweise jeweils durch die Reihenschaltung eines Schalters und einer Diode gebildet. An expanded solution with four transitions for both polarities is that with the first end of the inductor connected connection of the capacitance via two parallel switches with opposite direction of passage with earth, over a first switch with a positive operating voltage, via a second switch with an equally large second operating voltage connected and the second end of the inductor via two parallel switches with opposite forward direction with half the first operating voltage and two more Switch in the opposite direction with the half second operating voltage are connected. The switch routes with different pass directions preferably in each case through the series connection of a switch and a diode.

Die Erfindung wird im folgenden anhand der Zeichnung an mehreren Ausführungsbeispielen erläutert. In der Zeichnung zeigen

Fig. 1
ein einfaches Prinzipschaltbild der erfindungsgemäßen Schaltung für eine Polarität der Spannung an der Kapazität,
Fig. 2
Kurven zur Erläuterung der Funktion der Schaltung nach Fig. 1,
Fig. 3
eine erweiterte Schaltung für beide Polaritäten und vier Übergänge,
Fig. 4
Kurven zur Erläuterung der Wirkungsweise der Schaltung nach Fig. 3,
Fig. 5
eine Variante der erfindungsgemäßen Schaltung,
Fig. 6
eine weitere Variante der Schaltung und
Fig. 7
eine Schaltungsvariante für einen Bildschirm mit besonders großer Abmessung.
Fig.8 - Fig.12
ein einfaches Prinzipschaltbild und Kurven zur Erläuterung der Kompensation der Verluste während der Resonanz.
The invention is explained below with reference to the drawing using several exemplary embodiments. Show in the drawing
Fig. 1
a simple block diagram of the circuit according to the invention for a polarity of the voltage on the capacitance,
Fig. 2
1 to illustrate the function of the circuit,
Fig. 3
an extended circuit for both polarities and four transitions,
Fig. 4
3 to explain the mode of operation of the circuit,
Fig. 5
a variant of the circuit according to the invention,
Fig. 6
another variant of the circuit and
Fig. 7
a circuit variant for a screen with a particularly large size.
Fig. 8 - Fig. 12
a simple block diagram and curves to explain the compensation of losses during resonance.

In Fig. 1 bedeutet Cp die Gesamt-Plasma- oder Panel-Kapazität eines Plasma-Bildschirms.Dargestellt sind nur die Schaltungselemente für die Umladung von Cp zwischen O und einer positiven Spannung, nicht die weiteren Schaltungselemente für die entsprechende Umladung zwischen O und der negativen Spannung. Zwischen dem Punkt a und dem nicht geerdeten Anschluß der Kapazität Cp wird über die Stufe 1 eine Zusatzspannung Uza addiert, die für die Adressierung einer ganzen Zeile dient und dabei eine bestimmte Zeile selektiert. Für den Adressiervorgang wird jeweils auf eine Zeile eine erhöhte Spannung gegeben und zusätzlich eine Spannung für die Spaltenadressierung, die auf der gegenüberliegenden Seite von Cp zu denken ist. Durch diese Zeilenadressierung und Spaltenadressierung wird jeweils ein Pixel oder Bildpunkt adressiert. Der Punkt a ist über den ersten Schalter T1 mit der positiven Betriebsspannung E+, über die Reihenschaltung des Schalters T3 und der Diode D3 mit Erde und über die zur Energierückgewinnung dienende Induktivität L, die Diode D1 und den Schalter T2 mit der Spannungsquelle mit dem Wert E+/2 verbunden. L ist die zur Energierückgewinnung dienende Induktivität, in der die in Cp in Form der Spannung UCp gespeicherte Energie in Form eines Stromes zurückgewonnen wird. In Fig. 1, Cp means the total plasma or panel capacity of a plasma screen, only the circuit elements are shown for the transfer of Cp between O and a positive one Voltage, not the other circuit elements for the corresponding Transfer between O and the negative voltage. Between the point a and the non-grounded connection of the capacitance Cp an additional voltage Uza is added via stage 1, which for serves the addressing of an entire line and thereby one selected line selected. For the addressing process given increased tension on each line and additionally a voltage for the column addressing that is on the opposite side of Cp. Through this Row addressing and column addressing each become one pixel or pixel addressed. The point a is above the first Switch T1 with the positive operating voltage E +, via the series connection of the switch T3 and the diode D3 with earth and over the inductance L used for energy recovery, the diode D1 and the switch T2 with the voltage source with the value E + / 2 connected. L is the inductance used for energy recovery, in which the stored in Cp in the form of the voltage UCp Energy is recovered in the form of electricity.

Fig. 2 zeigt den zeitlichen Verlauf der Spannung UCp an der Kapazität Cp für eine Periode. Dabei zeigen die ausgezogenen Linien bei T1, T2, T3, während welcher Perioden die Schalter leitend gesteuert sind. Es ist ersichtlich, daß der Schalter T2 jeweils während der Übergänge, also der Umladung von Cp zwischen O und E+ leitend ist. T1 und T3 bewirken demgegenüber T2 längere Anschaltung des Anschlusses a an die Spannung E+ während der Zündphase bzw. an Erde während der Periode mit dem Spannungswert null. Zur Vereinfachung ist Fig. 1 nur für die eine Polarität dargestellt, also nur die Anschaltung an E+ und Erde. Es ist ersichtlich, daß die Spannung UCp an der Kapazität Cp während einer Periode drei verschiedene Spannungswerte, in diesem Beispiel E-, O und E+ annimmt. Zwischen den Spannungswerten O und E+ erfolgt jeweils während der leitenden Phase von T2 ein Übergang in Form einer Sinushalbwelle oder Sinusschwingung mit 180°, weil T2 an die Spannungsquelle E+/2 angeschlossen ist. Der Umladevorgang zwischen O und E+ ist also gewissermaßen ein Drehen um die mittlere Spannung E+/2. Die zusätzlichen Mittel für den Übergang von E- nach O und O nach E- sind in Fig. 1 nicht dargestellt. Dies sind in Fig. 3 die zusätzlichen Schalterstrecken T6, D6 bzw. T6-, D6-. Durch diese Steuerung mit drei verschiedenen Spannungswerten und einer Resonanzschwingung jeweils zwischen zwei verschiedenen aufeinanderfolgenden Spannungswerten wird die Ansteuerung der Kapazität Cp wesentlich verbessert, und zwar insbesondere die Anregung zum Leuchten des jeweiligen Bildpunktes durch den einen der Spannungswerte, vorzugsweise den dargestellten Spannungswert E+.2 shows the time course of the voltage UCp across the capacitance Cp for a period. The undressed show Lines at T1, T2, T3, during which periods the switches are controlled. It can be seen that the switch T2 in each case during the transitions, ie the reloading of Cp between O and E + is conductive. In contrast, T1 and T3 cause longer ones Connection of the connection a to the voltage E + during the Ignition phase or to earth during the period with the voltage value zero. For simplification, Fig. 1 is only for one polarity shown, i.e. only the connection to E + and earth. It is it can be seen that the voltage UCp at the capacitance Cp during three different voltage values in one period Example E-, O and E + assumes. Between the voltage values O and E + occurs during the conducting phase of T2, respectively Transition in the form of a sine half wave or sine wave with 180 ° because T2 is connected to the voltage source E + / 2. Of the Reloading process between O and E + is therefore a kind of Turn around the average voltage E + / 2. The additional funds for the transition from E- to O and O to E- are in Fig. 1st not shown. These are the additional ones in FIG. 3 Switch routes T6, D6 or T6-, D6-. By using this control three different voltage values and a resonance vibration each between two different successive ones The control of the capacitance Cp becomes essential improved, especially the suggestion to light the respective pixel by one of the voltage values, preferably the voltage value E + shown.

Fig. 3 zeigt die Erweiterung der Schaltung gemäß Fig. 2 für beide Polaritäten und drei Spannungswerte gemäß Fig. 2. Für die dargestellten Spannungen E3 und E4 gilt:
E3 = -V1/2, E4 = +V2/2. Die Schaltung nach Fig. 3 arbeitet im wesentlichen nach dem Prinzip der Schaltung gemäß Fig. 1, wobei zum besseren Verständnis folgende Konkordanzaufstellung gilt: Fig. 4 Fig. 1 T4-, D4- T2, D1 T4, D4 T2, D1 T6, D6 T2, D1 T6-, D6- T2, D1 T5-, D5- T3, D3 T5, D5 T3, D3 T1 T1 T2 3 shows the expansion of the circuit according to FIG. 2 for both polarities and three voltage values according to FIG. 2. For the voltages E3 and E4 shown:
E3 = -V1 / 2, E4 = + V2 / 2. The circuit according to FIG. 3 essentially works on the principle of the circuit according to FIG. 1, the following list of concordances being used for a better understanding: Fig. 4 Fig. 1 T4-, D4- T2, D1 T4, D4 T2, D1 T6, D6 T2, D1 T6-, D6- T2, D1 T5-, D5- T3, D3 T5, D5 T3, D3 T1 T1 T2

Cp ist wieder die Gesamtkapazität. Der eigentliche Energiefluß erfolgt über T1, T2. Die Frequenz, mit der die Umladung erfolgt, beträgt etwa 30 bis 100 kHz.Cp is the total capacity again. The actual flow of energy takes place via T1, T2. The frequency at which the transhipment takes place is about 30 to 100 kHz.

Fig. 4 zeigt wieder durch die ausgezogenen Linien, welche Schalter T1 - T6 in Fig. 3 in den einzelnen Zeitabschnitten einer Periode leiten. Es ist ersichtlich, daß die Schalterstrecken T4/D4, T4-/D4-, T6/D6 und T6-/D6- jeweils während der Umladung von Cp, also der Übergänge von UCp leitend sind. T1, T2 bewirken wiederum während ihrer leitenden Phase die gegenüber der Umschaltung längere Anschaltung des Anschlusses a der Kapazität Cp an V2 und V1, während die Schalterstrecken T5/D5 und T5-/D5- zeitlich dazwischen die Anschaltung des Anschlusses a an Erde bewirken, um die beschriebenen Zeiträume mit dem Spannungswert null zu bilden. Es ist ersichtlich, daß zur Anpassung an den Plasmaschirm die Spannungswerte V2 und V1 verschieden groß sind, z.B. V2=120 Volt und V1-150 Volt.Fig. 4 shows again by the solid lines, which Switches T1 - T6 in Fig. 3 in the individual periods Lead period. It can be seen that the switch routes T4 / D4, T4- / D4-, T6 / D6 and T6- / D6- each during the transhipment of Cp, i.e. the transitions of UCp are conductive. T1, T2 effect again during their leading phase the opposite of the Switching over longer connection of connection a of the capacitance Cp at V2 and V1, while the switch sections T5 / D5 and T5- / D5- in between the connection of connection a to earth cause to the described periods with the voltage value to form zero. It can be seen that to adapt to the Plasma screen the voltage values V2 and V1 are of different sizes, e.g. V2 = 120 volts and V1-150 volts.

Fig. 5 zeigt eine Alternativlösung zu Fig. 3. Der Strom für die Zündphase, also die Anregung zum Leuchten, fließt im wesentlichen über die als Schalter dargestellten Transistoren TH und TL. Bei einem besonders großen Plasmaschirm ist wegen der erforderlichen höheren Ströme auch eine Aufteilung auf mehrere Stromwege sinnvoll. Die Umladung von Cp erfolgt aufgrund des Aufbaus der Schalter T1, T2; T3, T1. Die mittlere Spannung von Cp ist nur null, wenn die Spannungen V2 und V1 symmetrisch, also im Betrag gleich sind.Fig. 5 shows an alternative solution to Fig. 3. The current for the The ignition phase, i.e. the excitation to glow, essentially flows via the transistors TH and TL shown as switches. A particularly large plasma screen is necessary because of the higher currents also split into several current paths sensible. The transfer of Cp takes place due to the structure of the Switches T1, T2; T3, T1. The average voltage of Cp is only zero if the voltages V2 and V1 are symmetrical, i.e. in magnitude are the same.

Fig. 6 zeigt eine weitere Alternativlösung mit der Möglichkeit, die extremen Spannungen zu dissymmetrieren, indem eine Hilfsquelle E2 eingeführt wird, die gleich ist der Hälfte der Amplitudendifferenz von UCp an Cp.6 shows a further alternative solution with the possibility of to dissymmetrize the extreme voltages by using an auxiliary source E2 is introduced, which is equal to half of that Amplitude difference from UCp to Cp.

Fig. 7 zeigt eine Variante für einen Plasmabildschirm mit großer Abmessung. Der überwiegende Teil der über die Schalter TH und TL für den Bildschirm übertragende Energie wird in zwei Teile aufgeteilt, von denen jeder eine entsprechende Aufrechterhaltungsschaltung THB-TLB zugeordnet ist. Diese Schaltung zeigt die Möglichkeit, eine gemeinsame Resonanzschaltung zu verwenden.Fig. 7 shows a variant for a plasma screen with a large Dimension. The majority of the switches TH and TL for the screen transmitting energy is in two parts divided, each of which has a corresponding maintenance circuit THB-TLB is assigned. This circuit shows the Possibility to use a common resonance circuit.

Anhand der Figuren 8 - 12 wird im folgenden die Kompensation der Verluste während der Resonanz beschrieben.In the following, the compensation of the Losses described during resonance.

Wenn gemäß Fig. 9 und 10 der Strom I1 in dem Zeitpunkt, in dem der Strom I2 einschaltet, abgeschaltet wird, wird vor dem Resonanzverhalten zwischen L und Cpanel keine Energie in die Induktivität L übertragen.9 and 10, the current I1 at the time when the current I2 turns on, is turned off, before the Resonance behavior between L and Cpanel no energy in the Inductance L transmitted.

Die im Zeitpunkt der Beginn der Resonanz vorhandene Energie ist: 12 C E 2 2 . The energy present at the start of the resonance is: 1 2nd C. E 2nd 2nd .

Auf Grund von Verlusten während des Resonanzverhaltens erreicht die Spannung Vp am Ende der Resonanz nicht die Spannung E, wodurch ein Stromimpuls I3 erzeugt wird, wenn dieser einschaltet.Achieved due to losses during resonance behavior the voltage Vp at the end of the resonance not the voltage E, whereby a current pulse I3 is generated when this switches on.

Wenn im Gegensatz dazu der Strom I2 eingeschaltet wird, bevor der Strom I1 abgeschaltet wird, fließt ein Strom durch die Induktivität L und der Strom I1 speichert Energie in der Induktivität. Wenn I1 abgeschaltet wird,Conversely, if current I2 is turned on before the current I1 is turned off, a current flows through the Inductance L and the current I1 stores energy in the Inductance. When I1 turns off

beträgt die in dem Resonanzverhalten vorhandene Energie 1 / 2 LIs2 + 1 / 2C E 2 / 2 : Der Zusatz von 1 / 2LIs 2 macht es möglich, die Verluste während des Resonanzvorganges (Verluste in L, I2 und Cp) zu kompensieren, demzufolge I'p〉Ip.the energy present in the resonance behavior is 1/2 LIs 2 + 1/2 C E 2/2 : The addition of 1/2 LIs 2 makes it possible to compensate for the losses during the resonance process (losses in L, I2 and Cp) , therefore I'p〉 Ip.

Die Verzögerung τ wird für eine geeignete Kompensation der Verluste eingestellt, so daß Vp am Ende der Viertelperiode genau die Spannung E erreicht.The delay τ is used for a suitable compensation of the Losses set so that Vp is accurate at the end of the quarter voltage E reached.

Bezugnehmend auf Fig. 3 der Anmeldung ist ersichtlich, daß eine derartige Verzögerung in den Schaltern T5- und T5+ entsprechend dem Übergang angewendet werden sollte.Referring to Fig. 3 of the application, it can be seen that a such delay in switches T5- and T5 + accordingly the transition should be applied.

Claims (5)

  1. Alternating current generator for controlling the line addressing of a plasma display screen, in the case of which generator a connection (a) of a screen capacitance (Cp) is cyclically and successively connected via switches to different operating voltages, and an inductance (L) which is used for energy recovery is located in the path of the charge-changing current for the capacitance (Cp), characterized in that the capacitance (Cp) is successively connected via switches (T1 - T6, T4- -T6-) to operating voltages (V1, V2, E3+, E4+) of different magnitudes in such a manner that the voltage (UCp) across the capacitance (Cp) cyclically and successively assumes three voltage values (V1,V2, 0) of different magnitude, with transitions in between,
    and that the connection (a) of the capacity (Cp) which is connected to the first end of the inductance (L) is connected to earth via two parallel switches (T5, T5-) having opposite forward directions to a positive operating voltage (V2) and via a second switch (T2) to a second operating voltage (V1).
  2. Generator according to claim 1, characterized in that
    the second end of the inductance (L) is connected via two parallel switches (T4, T4-) having opposite forward directions to about half the first operating voltage (E4+) and via two further switches (T6, T6-) having opposite forward directions to about half the second operating voltage (E3+).
  3. Generator according to claim 1 or 2, characterized in that
    the voltage (UCp) across the capacitance (Cp) has a period at the voltage zero between a period at a positive voltage (V2) and a period at a negative voltage (V1).
  4. Generator according to claim 3, characterized in that
    the positive voltage (V2) and the negative voltage (V1) are of different magnitude.
  5. Generator according to claim 2, 3 or 4, characterized in that
    at least one switch (T5, T5-) which is connected in parallel to the screen capacitance (Cp, Cpanel) is allowed to be switched off only after a current (I2) for charging the coil (L) is switched off at it's second end by switches (T4, T4-, T6, T6-) so that losses during resonance are compensated.
EP94922870A 1993-07-02 1994-06-24 Alternating current generator for controlling a plasma display screen Expired - Lifetime EP0706703B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4321945A DE4321945A1 (en) 1993-07-02 1993-07-02 Alternating voltage generator for controlling a plasma display screen
DE4321945 1993-07-02
PCT/EP1994/002057 WO1995001627A1 (en) 1993-07-02 1994-06-24 Alternating current generator for controlling a plasma display screen

Publications (2)

Publication Number Publication Date
EP0706703A1 EP0706703A1 (en) 1996-04-17
EP0706703B1 true EP0706703B1 (en) 1998-09-02

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US (1) US5808420A (en)
EP (1) EP0706703B1 (en)
JP (1) JP3423316B2 (en)
KR (1) KR100333777B1 (en)
CN (1) CN1101039C (en)
DE (2) DE4321945A1 (en)
ES (1) ES2123806T3 (en)
WO (1) WO1995001627A1 (en)

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CN1101039C (en) 2003-02-05
EP0706703A1 (en) 1996-04-17
CN1125993A (en) 1996-07-03
KR100333777B1 (en) 2003-01-09
DE4321945A1 (en) 1995-01-12
JPH08512140A (en) 1996-12-17
ES2123806T3 (en) 1999-01-16
US5808420A (en) 1998-09-15
DE59406845D1 (en) 1998-10-08
JP3423316B2 (en) 2003-07-07
KR960703489A (en) 1996-08-17
WO1995001627A1 (en) 1995-01-12

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