JP2005070598A - Plasma display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify the configuration of the drive circuit of a plasma display device used for image display of a television receiver, a computer terminal, etc. <P>SOLUTION: The plasma display device has a plasma display panel, having a scanning electrode, a sustaining electrode and a writing electrode and a drive circuit for supplying a driving voltage to the scanning electrode and sustaining electrode of the plasma display panel. The drive circuit is comprised of a voltage doubler circuit 28 and transistors 21, 22, 23, and 24 for controlling the supply of the drive voltage to the electrodes of the plasma display panel and serves commonly as the transistors 21 and 22 and a switching element constituting the voltage doubler circuit 28. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a plasma display device used for image display of a television receiver and a computer terminal.

  In general, a plasma display apparatus using a plasma display panel as a display device is configured as shown in FIG. That is, the plasma display panel 1 has a structure in which a discharge space is formed by overlapping two glass plates, and a plurality of discharge cells are provided by forming a plurality of scan electrode groups, sustain electrode groups, and write electrode groups. It is. A writing circuit 2 is connected to the writing electrode group of the plasma display panel 1 and a scanning circuit 3 is connected to the scanning electrode group, and discharge is performed by a selection pulse from the writing circuit 2 and the scanning circuit 3. An address operation is performed on the discharge cell. Further, a sustain circuit 4 is connected to the scan electrode group of the plasma display panel 1 through the scan circuit 3, and a sustain circuit 5 is connected to the sustain electrode group, and outputs are alternately output from the sustain circuit 4 and the sustain circuit 5. The display is driven by performing a sustain discharge operation in the discharge cell in which writing is performed with the sustain pulse. The sustain circuits 4 and 5 include a switch element for supplying a sustain discharge current, a switch element for supplying a sustain pulse switching current, a capacitor, and an inductance. A semiconductor element such as a MOSFET is used as the switch element. It is done.

  In this plasma display device, as disclosed in Patent Document 1, a scan electrode, a sustain electrode, and a data electrode are arranged in a panel, and a plurality of types of drive voltages are applied to the scan electrode. Here, a driving circuit for applying a driving waveform composed of a plurality of types of driving voltages to the panel electrode will be described with reference to FIGS.

  FIG. 3 shows an example of a drive circuit that applies a drive waveform composed of drive voltages Vs, Vi, and 0 V to the electrodes of the panel. FIG. 4 shows an example of a drive waveform applied to the panel electrode by the drive circuit shown in FIG. In FIG. 3, 11, 12, 13, and 14 are transistors made of MOSFETs, 15 is a power source that generates a drive voltage Vs, 16 is a diode, 17 is a capacitor, and 18 is a power source that generates a drive voltage Vi.

In FIG. 4, the drive waveform applied to the electrode of the panel is composed of nine periods consisting of periods t _{1 to} t _{9. In} periods t ₁ , t ₅ , t ₇ , and t ₉ , the transistors 12 and 14 are turned on. A drive voltage of 0 V can be applied to the electrodes by conducting. At this time, the capacitor 17 is charged with the drive voltage Vi through the diode 16. In the periods t ₂ , t ₄ , t ₆ , and t ₈ , the transistor 11 and the transistor 14 are brought into conduction, so that the drive voltage Vs can be applied to the panel electrode. Further, in the period t ₃ , the transistor 11 and the transistor 13 are turned on, so that the driving voltage Vs + Vi can be applied to the electrode of the panel.
JP 2000-242224 A

  However, in the driving circuit of such a plasma display device, it is necessary to individually output a plurality of driving voltages in the power circuit block and supply them to the driving circuit block, and the more complicated the driving waveform applied to the panel electrode is, There is a problem that the number of parts of the power circuit block increases and the cost increases.

  The present invention has been made in view of such problems, and an object thereof is to simplify the configuration of a drive circuit.

  In the plasma display device according to the present invention, the drive circuit includes a voltage doubler circuit and a switching element that controls the supply of the drive voltage to the electrodes of the plasma display panel, and the switching element and the switching that constitutes the voltage doubler circuit. It also serves as an element.

  According to the plasma display device of the present invention described above, the types of drive voltages supplied from the power supply circuit block to the drive circuit can be reduced, and the effects of reducing the number of parts of the power supply circuit block and reducing the cost can be obtained.

  That is, in the present invention, the plasma display panel having a scan electrode, a sustain electrode, and a write electrode, and a drive circuit that supplies a drive voltage to the scan electrode and the sustain electrode of the plasma display panel, And a switching element that controls supply of a driving voltage to the electrodes of the plasma display panel, and the switching element and the switching element that constitutes the voltage doubler circuit are combined.

  The driving circuit includes a first transistor that applies a driving voltage Vs to an electrode of the plasma display panel, a drain terminal connected to the source terminal of the first transistor, and the driving voltage Vt applied to the electrode of the plasma display panel. A second transistor to be applied; a first diode having an anode terminal connected to a drain terminal of the first transistor; a second diode having an anode terminal connected to a cathode terminal of the first diode; A first capacitor connected between the source terminal of one transistor and the cathode terminal of the first diode, and a second capacitor connected to the cathode terminal of the second diode.

  Hereinafter, a plasma display apparatus according to an embodiment of the present invention will be described with reference to the drawing of FIG.

  FIG. 1 shows a driving circuit of a plasma display apparatus according to an embodiment of the present invention. In the figure, reference numerals 21, 22, 23 and 24 denote transistors made of MOSFETs, and 25 denotes a power source for generating a panel driving voltage Vs. The transistor 21 as the first transistor applies the driving voltage Vs to the electrode of the panel, and the transistor 22 as the second transistor applies the driving voltage of 0 V to the electrode of the panel. The drain terminal of the transistor 22 is connected.

  The drain terminal of the transistor 21 is connected to the anode terminal of a diode 29 that is a first diode for pumping up the drive voltage Vs, and the drive voltage Vs is pumped up between the cathode terminal of the diode 29 and the source terminal of the transistor 21. A first capacitor 30 is connected. The cathode terminal of the diode 29 is connected to the anode terminal of a diode 31 that is a second diode for voltage doubler rectification, and the capacitor that is the second capacitor for voltage doubler rectification is connected to the cathode terminal of the diode 31. 32 is connected, and the transistor 21, transistor 22, diode 29, capacitor 30, diode 31, and capacitor 32 constitute a voltage doubler circuit 28 for the drive voltage Vs.

  A drive voltage Vi is generated from the voltage doubler circuit 28 through a regulator 33, and a capacitor 27 that pumps up the Vi voltage is charged through a diode 26 that pumps up the Vi voltage.

  The transistor 23 is a transistor that applies the driving voltage Vi to the electrode of the panel, and the transistor 24 is a transistor that blocks the driving voltage Vi.

  Thus, in the driving circuit of the plasma display device, the transistors 21 and 22 for applying the driving voltages Vs and 0 V to the electrodes of the panel also serve as the switching transistors of the voltage doubler circuit 28 for generating the other driving voltage Vi. doing.

  As is apparent from the above description, according to the plasma display device of the present invention, the switching element constituting the drive circuit is also used as the switching element constituting the voltage doubler circuit, so that the drive circuit is driven from the power supply circuit block. The types of drive voltages supplied to the power supply circuit can be reduced, and the effects of reducing the number of parts of the power supply circuit block and reducing the cost can be obtained.

  According to the present invention, the number of parts of the power supply circuit block of the drive circuit can be reduced and the cost can be reduced, which is useful for reducing the cost of the plasma display device.

The circuit diagram which shows the drive circuit of the plasma display apparatus by one embodiment of this invention Configuration diagram showing a conventional plasma display device Circuit diagram showing the drive circuit of the device Drive waveform diagram of the circuit shown in FIG.

Explanation of symbols

1 Plasma display panel 21, 22, 23, 24 Transistor 26, 29, 31 Diode 27, 30, 32 Capacitor 28 Voltage doubler circuit

Claims (2)

A plasma display panel having a scan electrode, a sustain electrode and a write electrode, and a drive circuit for supplying a drive voltage to the scan electrode and the sustain electrode of the plasma display panel, wherein the drive circuit includes a voltage doubler circuit and a plasma display A plasma display device comprising: a switching element that controls supply of a driving voltage to an electrode of a panel; and the switching element and the switching element that constitutes the voltage doubler circuit. The driving circuit includes a first transistor that applies a driving voltage Vs to the electrode of the plasma display panel, a first transistor that has a drain terminal connected to the source terminal of the first transistor and applies the driving voltage Vt to the electrode of the plasma display panel. 2 transistor, a first diode having an anode terminal connected to the drain terminal of the first transistor, a second diode having an anode terminal connected to the cathode terminal of the first diode, and the first transistor The first capacitor connected between the source terminal of the first diode and the cathode terminal of the first diode, and the second capacitor connected to the cathode terminal of the second diode. Plasma display device.

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