KR100811041B1 - A driving apparatus for plasma display panel - Google Patents

Abstract

The present invention relates to a plasma display panel driving apparatus capable of reducing the number of switching elements used in the driving apparatus and lowering the cost and power consumption. The present invention relates to a scan driving IC and an energy storage unit to store energy supplied to the panel. An energy recovery switching unit providing a path for recovery to the unit; A setup ramp waveform supply, a ground voltage supply, and a selection power supply located on the recovery path; An energy supply switching unit connected to the scan driving IC and the energy storage unit and providing a path for supplying energy charged in the energy storage unit to the panel; By including a sustain pulse waveform supply unit, a set down lamp and a scan pulse waveform supply unit positioned on the supply path, the number of switching elements can be reduced, thereby reducing the cost of the driving device, reducing the total power consumption, and sustain driving. By separating the power supply and the setup lamp driving power supply, and the grounding power supply and the set-down lamp driving power supply, it is possible to reduce the overall cost by eliminating switching means (pass_top switch and pass_bottom switch) to prevent reverse current.

Description

Plasma display panel driving device {A DRIVING APPARATUS FOR PLASMA DISPLAY PANEL}

1 is a circuit diagram of an embodiment of a conventional plasma display panel driving apparatus.

2 is an exemplary diagram of waveforms applied to the sustain electrodes of the plasma display panel.

Figure 3 is a circuit diagram of an embodiment of a plasma display panel driving apparatus according to the present invention.

4 is a current flow diagram for operation in a sustain period in accordance with the present invention.

5 is a simulation result waveform diagram of the circuit shown in FIG. 3;

6 is a circuit diagram of another embodiment of a plasma display panel driving apparatus according to the present invention;

7 is a circuit diagram of yet another embodiment of the plasma display panel driving apparatus according to the present invention;

8 is a circuit diagram of another embodiment of a plasma display panel driving apparatus according to the present invention;

** Description of the symbols for the main parts of the drawings **

10: setup ramp waveform supply 20: optional power supply

30: energy recovery switching unit 40: ground voltage supply unit

50: scan drive IC 60: energy storage

70: energy supply switching unit 80: sustain pulse waveform supply unit

90: set-down ramp and scan pulse waveform supply

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel driving apparatus, and more particularly, to a plasma display panel driving apparatus capable of reducing cost and power consumption by reducing the number of switching elements used in the driving apparatus.

Plasma Display Panels (hereinafter referred to as "PDPs") display an image including letters or graphics by emitting phosphors by ultraviolet rays generated when the inert gas is discharged. Such a PDP is not only thin and easy to enlarge, but also greatly improved in quality due to recent technology development. In particular, the three-electrode AC surface discharge type PDP has advantages of low voltage driving and long life because wall charges are accumulated on the surface during discharge and protect the electrodes from sputtering caused by the discharge.

1 shows a conventional PDP driving apparatus.

Referring to FIG. 1, a conventional PDP driving apparatus includes a plurality of switching elements (1 to 1) for supplying energy to a panel during a sustain period, recovering and charging energy from the panel, and supplying a pulse having a sustain voltage (Vs) to the panel. 4), a switching element 5 for applying the voltage Vsetup of the setup lamp driving power supply to the panel, a switching element 6 for applying the voltage (-Vy) of the set-down lamp driving power supply to the panel, and an address. A switching element 7 for applying a scan pulse having a -Vy voltage to the panel during the interval, a plurality of switching elements 8 and 9 for selectively applying the Vsc driving voltage to the panel during the address interval, and different driving It consists of two switching elements (pass_top switch and pass_bottom switch) to prevent current from flowing back into the power supply.

The pass_top switch is positioned between the switching element 5 for applying the voltage of the set-up lamp driving power to the panel and the switching element 6 for applying the voltage of the set-down lamp driving power to the panel and is connected to -Vy at ground (GND). This is to prevent current from flowing to the driving power source.

The pass_bottom switch is located between the energy circuit unit (3,4 contact point) for energy recovery and the pass_top switching element, and thus Vsetup power supply may occur because Vsetup, which is a setup driving power supply, is always greater than Vs, which is a driving power voltage of a sustain pulse. This is to prevent current from flowing from Vs to Vs power supply.

Therefore, in the conventional PDP driving apparatus, a pass_top switch and a pass_bottom switch are always required, and are needed at a position where a large current flows, thereby increasing the price of the driving apparatus and increasing power consumption.

Therefore, the present invention was created to solve the above-described conventional problems, and connects a portion for applying a ground voltage and a portion for applying a voltage Vsetup of the setup lamp driving power supply to one side of the scan driving IC, By connecting the part applying voltage (Vs) and the part applying the voltage (-Vy) of the set-down lamp and the scan pulse driving power supply to the other side of the scan driving IC to apply the reset voltage, the scan voltage and the sustain voltage to the panel, The purpose of the present invention is to provide a plasma display panel driving apparatus capable of reducing the cost of the driving apparatus by reducing the number of switching elements and reducing the total power consumption.

In addition, the present invention reduces the overall cost by separating the sustain drive power supply and the setup lamp drive power supply, and by separating the ground power supply and the set-down lamp drive power supply, eliminating switching means (pass_top switch and pass_bottom switch) to prevent reverse current It is an object of the present invention to provide a plasma display panel driving apparatus that can be made.

According to an aspect of the present invention, an energy recovery switching unit is connected to a scan driving IC and an energy storage unit to provide a path for recovering energy supplied to a panel to the energy storage unit; A setup ramp waveform supply, a ground voltage supply, and a selection power supply located on the recovery path; An energy supply switching unit connected to the scan driving IC and the energy storage unit and providing a path for supplying energy charged in the energy storage unit to the panel; And a sustain pulse waveform supply part, a set down ramp, and a scan pulse waveform supply part positioned on the supply path.

The energy recovery switching unit may include switching means for selectively connecting the scan driving IC and the energy storage unit by an on and off switching operation, and a diode for preventing a reverse current.

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The energy supply switching unit may include switching means for selectively connecting the scan driving IC to the energy storage unit by switching on and off and a diode for preventing a reverse current.

According to an aspect of the present invention, an energy recovery switching unit is connected to a scan driving IC and an energy storage unit to provide a path for recovering energy supplied to a panel to the energy storage unit; A sustain pulse waveform supply unit and a ground voltage supply unit located on the recovery path; An energy supply switching unit connected to the scan driving IC and the energy storage unit and providing a path for supplying energy charged in the energy storage unit to the panel; And a setup ramp waveform supply part, a selection power supply part, a set down ramp, and a scan pulse waveform supply part positioned on the supply path.

According to an aspect of the present invention, an energy supply switching unit is connected to a scan driving IC and an energy storage unit and provides a path for supplying energy charged in the energy storage unit to the panel; A sustain pulse waveform supply unit, a ground voltage supply unit and a selection power supply unit located on the supply path; An energy recovery switching unit connected to the scan driving IC and the energy storage unit and providing a path for recovering energy supplied to the panel to the energy storage unit; And a setup ramp waveform supply part, a setdown ramp and a scan pulse waveform supply part positioned on the recovery path.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described.

First, in describing the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

In addition, many specific details, such as specific processing flows, are set forth in the following description to provide a more general understanding of the invention, but are not limited thereto, and it is understood that the invention may be practiced without these specific details. It will be self-evident to those of ordinary knowledge in Esau.

As shown in the driving waveform applied to the sustain electrode shown in FIG. 2, the driving device of the PDP includes a setup waveform applied to the reset periods (1, 2) and a scan pulse waveform and sustain applied to the address period (3). It can be seen that the sustain pulse waveform applied to the section ④ is applied to the sustain electrode of the panel.

In other words, the driving device of the PDP is a driving power source for applying a sustain pulse waveform, a setup ramp waveform, a setdown ramp waveform, a scan pulse waveform, and a pulse waveform of an area where no scan pulse is applied among the address periods, that is, Vs, Vsetup,- Circuits for supplying the voltages of Vy and Vsc power supply should be provided.

In addition, in order to increase the efficiency of the driving apparatus, an energy recovery circuit for recovering energy from the panel when applying the sustain pulse waveform and supplying the recovered energy back to the panel should be provided.

The present invention is to perform the above-described energy recovery and driving power supply operation to reduce the number of switching elements, the main purpose is to reduce the number of the switching elements to reduce the cost of the drive device, and to reduce the power consumption.

In the present invention, the switching element to be reduced is a pass_top switch and a pass_bottom switch for preventing reverse current between driving power sources shown in FIG. Can be reduced. In order to remove the two switches, two driving power sources, that is, a ground voltage and a -Vy driving power source and a Vs and Vsetup driving power source, through which reverse current may flow, are configured to be input through other input terminals of the scan driving IC.

For example, when the ground voltage is input to the first input terminal (one side) of the scan driver IC, the -Vy driving power source is configured to be input to the second input terminal (the other side) of the scan driver IC, and the Vs driving power source is input to the second input terminal of the scan driver IC. When input to the input terminal, the Vsetup driving power is configured to be input to the first input terminal of the scan driving IC.

The ground voltage and the Vs driving power may be input to the first input terminal of the scan driving IC, and the Vsetup driving power and the -Vy driving power may be input to the second input terminal of the scan driving IC. That is, a switching element configured in the scan driver IC prevents reverse current between the driving power supplies.

In addition, the portion (selection power supply) to which the Vsc voltage is applied, which indicates that the cell, which is the portion to which the scan pulse is not applied, is not selected in the section ②, which is the address section shown in FIG. It can be configured to be connected to two inputs.

Figure 3 shows an embodiment of a circuit for a PDP driving apparatus according to the present invention, the scan driving IC 50, the setup ramp waveform supply unit 10, the set-down ramp and scan pulse waveform supply unit 90, the sustain pulse waveform supply unit 80, a ground (GND) voltage supply unit 40, an energy recovery switching unit 30, an energy supply switching unit 70, an energy storage unit 60, and a selective power supply unit 20.

Referring to FIG. 3, an energy recovery switching unit 30, a setup ramp waveform supply unit 10, a ground voltage supply unit 40, and a selection power supply unit 20 are connected to one side of the scan driving IC 50, and supply energy. The switching unit 70, the set down ramp, the scan pulse waveform supply unit 90, and the sustain pulse waveform supply unit 80 are connected to the other side of the scan driving IC 50.

The energy storage unit 60 is composed of a capacitor (C) having one side connected to ground and an inductor (L) having one side connected to the other side of the capacitor (C), and blocks other than the energy storage unit 60 are one. It consists of the above switching means.

That is, the setup ramp waveform supply unit 10 is shown in FIG. 2 when one side is connected to Vsetup, which is a setup lamp driving power supply, the other side is connected to one side of the scan driving IC 50, and the first switching element S1 is turned on. The setup ramp waveform of the section 1 is applied to the panel through the ninth switching element S9 connected to one side of the scan driving IC 50.

The ground voltage supply unit 40 is turned on when the ground voltage is applied in the driving waveform shown in FIG. 2, for example, when the ground voltage of the sustain pulse shown in section ④ is applied. The ground voltage is applied to the panel through the ninth switching element S9 connected to one side of the scan driving IC 50.

The energy recovery switching unit 30 includes a diode D1 and a third switching device S3 for preventing reverse current. When the third switching device S3 is turned on, the ninth switching of the scan driving IC 50 is performed. Forming a path connecting the panel and the energy storage unit 60 through the device (S9) to perform the function of charging the energy supplied to the panel with the capacitor (C), this process of the sustain pulse supplied to the panel This is done during the polling time.

The energy supply switching unit 70 includes a diode D2 and a fourth switching device S4 for preventing reverse current. When the fourth switching device S4 is turned on, the tenth switching of the scan driving IC 50 is performed. Forming a path connecting the panel and the energy storage unit 60 through the device (S10) to perform the function of supplying the energy charged in the capacitor (C) to the panel, this process of the sustain pulse supplied to the panel It takes place during the rising time.

The sustain pulse waveform supply unit 80 is shown in FIG. 2 when one side is connected to the other side of the scan driving IC 50, the other side is connected to the sustain driving power supply Vs, and the sixth switching element S6 is turned on. The sustain pulse of the section (4) is applied to the panel through the tenth switching element (S10) of the scan driving IC (50).

The seventh switching element S7 having one side connected to the other side of the scan driving IC 50 and the other side connected to the set down lamp and the scan driving power supply (-Vy), respectively. And the eighth switching element S8 and each switching element is turned on, for example, when the seventh switching element S7 is turned on, the second driving element S10 of the scan driving IC 50 is connected to FIG. 2. The section down ramp waveform shown in Fig. 2 is applied to the panel, and when the eighth switching element S8 is turned on, the scan of the section 3 shown in Fig. 2 is performed through the tenth switching element S10 of the scan driving IC 50. Apply the pulse waveform to the panel.

When the selection power supply 20 is connected to one side of the scan driving IC 50, the other side is connected to the driving power supply Vsc having a predetermined voltage, and the second switching device S2 is turned on. In the section (address section) shown in Fig. 3, a pulse waveform for turning off the cells of the unselected panel is applied to the remaining part to which the scan pulse is applied. That is, by turning on the second switching element S2 and applying the Vsc driving voltage to the panel through the ninth switching element S9 of the scan driving IC 50, the unselected cells are turned off.

The operation of the PDP driving apparatus according to the present invention will now be described with reference to FIG.

First, a setup ramp waveform and a set down ramp waveform applied in sections 1 and 2, which are the reset sections of FIG. 2, are set up by turning on the first switching element S1 and the ninth switching element S9 to set up the V ramp voltage. When the setup ramp waveform is applied to the panel, the first switching element S1 and the ninth switching element S9 are turned off, and the seventh switching element S7 and the tenth switching element S10 are turned on. Apply a setdown ramp waveform to the panel that sets down to the Vy voltage.

Next, a Vsc voltage is applied to turn off the unselected cells in the section (3), which is an address period, and the seventh switching element S7 and the tenth switching element S10 are turned off to apply the Vsc voltage. The switching device S2 and the ninth switching device S9 are turned on to apply the Vsc voltage to the panel.

In order to apply a scan pulse for selecting a cell, the second switching element S2 and the ninth switching element S9 are turned off, and the eighth switching element S8 and the tenth switching element S10 are turned on. A scan pulse with Vy level is applied to the panel. After the scan pulse is applied, the remaining address section applies the pulse having the Vsc voltage to the panel, and the process thereof is omitted.

Next, the process of applying energy stored in the capacitor C to the panel (A), the process of applying the sustain voltage to the panel (B), and recovering the energy supplied to the panel to the capacitor (C) in the sustain section ④. And a process (D) of applying a ground voltage to the panel (C), and FIG. 4 shows the flow of current by each process.

The process A is a process of supplying energy charged in the capacitor C to the panel by turning on the fourth switching element S4 and the tenth switching element S10.

The process B is a process of supplying a voltage of the sustain driving power supply Vs to the panel by turning on the sixth switching element S6 and the tenth switching element S10.

In the process C, the third switching element S3 and the ninth switching element S9 are turned on to recover energy supplied to the panel and charge the capacitor C. FIG.

The process D is a process of supplying a ground (GND) voltage to the panel by turning on the fifth switching element S5 and the ninth switching element S9. Through this process, the sustain section operates.

FIG. 5 shows an actual simulation result for the driving apparatus of an embodiment of the present invention shown in FIG. 3, and it can be seen that a setup ramp waveform, a setdown ramp waveform, a scan pulse waveform, and a sustain pulse waveform are formed. That is, even if the number of switching elements is reduced, there is no problem in driving the PDP.

As such, the present invention separates the driving power that may generate reverse current and inputs them to different input terminals of the scan driving IC 50, thereby eliminating switching elements (pass_top switch and pass_bottom switch) for preventing reverse current between the driving power supplies. Can be.

In addition, in FIG. 2, the selected power supply unit 20 may be connected to the other side of the scan driver IC 50 without being connected to one side of the scan driver IC 50 like the setup ramp waveform supply unit 10. The positions of the energy recovery switching unit 30 and the energy supply switching unit 70 may be interchanged. Of course, a portion to be considered may occur as the positions of the components change, but a description thereof will be omitted since it may distract from the gist of the present invention.

FIG. 6 illustrates another embodiment of the PDP driving apparatus according to the present invention. In FIG. 3, the setup ramp waveform supply unit 10 and the ground voltage supply unit 40 are connected to one side of the scan driver IC 50. Unlike the set-down ramp and scan pulse waveform supply unit 90 and the sustain pulse waveform supply unit 80 are connected to the other side of the scan driver IC 50, the sustain pulse waveform supply unit 80 and the ground voltage supply unit 40 have a scan driver IC. It is connected to one side of 50, and it can be seen that the setup ramp waveform supply unit 10, the set down lamp, and the scan pulse waveform supply unit 90 are connected to the other side of the scan driving IC 50. That is, the positions of the setup ramp waveform supply unit 10 and the sustain pulse waveform supply unit 80 are configured to be interchanged with each other.

7 and 8, the position of the selection power supply unit 20 may be connected to the other side of the scan driving IC 50 to which the set-down lamp and the scan pulse waveform supply unit 90 are connected. Alternatively, the positions of the energy recovery switching unit 30 and the energy supply switching unit 70 may be interchanged.

As described above, since the present invention configures the driving device by separating the driving power that may generate reverse current between the driving power sources, the switching element for preventing the reverse current between the driving power sources can be eliminated, thereby reducing the cost of the driving device. Not only can this be done, but there is an advantage of reducing power consumption by the switching element.

As described in detail above, the present invention connects a portion for applying the ground voltage and a portion for applying the voltage Vsetup of the setup lamp driving power supply to one side of the scan driver IC, and applies and sets down the portion for applying the sustain voltage Vs. By applying the voltage (-Vy) of the lamp and scan pulse driving power supply to the other side of the scan driving IC and applying the reset voltage, the scan voltage and the sustain voltage to the panel, the number of switching elements is reduced, thereby reducing the cost of the driving device. It is possible to reduce the power consumption and to reduce the overall power consumption.

In addition, the present invention reduces the overall cost by separating the sustain drive power supply and the setup lamp drive power supply, and by separating the ground power supply and the set-down lamp drive power supply, eliminating switching means (pass_top switch and pass_bottom switch) to prevent reverse current It can be effected.

Claims (25)

delete An energy recovery switching unit connected to a scan driving IC and an energy storage unit to provide a path for recovering energy supplied to the panel to the energy storage unit; A setup ramp waveform supply, a ground voltage supply, and a selection power supply located on the recovery path; An energy supply switching unit connected to the scan driving IC and the energy storage unit and providing a path for supplying energy charged in the energy storage unit to the panel; And a sustain pulse waveform supply unit, a set down lamp, and a scan pulse waveform supply unit positioned on the supply path. The method of claim 2, The energy recovery switching unit And switching means for selectively connecting said scan driving IC and said energy storage by switching on and off and a diode for preventing a reverse current. delete delete The method of claim 2, The energy supply switching unit And switching means for selectively connecting said scan driving IC and said energy storage by switching on and off and a diode for preventing a reverse current. delete The method of claim 2, The selected power supply unit And a predetermined voltage Vsc for turning off the unselected cells of the panel, connected to the scan driving IC and a driving power source Vsc having a predetermined voltage. Device. delete delete An energy recovery switching unit connected to a scan driving IC and an energy storage unit to provide a path for recovering energy supplied to the panel to the energy storage unit; A sustain pulse waveform supply unit, a ground voltage supply unit and a selection power supply unit located on the recovery path; An energy supply switching unit connected to the scan driving IC and the energy storage unit and providing a path for supplying energy charged in the energy storage unit to the panel; And a setup ramp waveform supply part, a set down lamp, and a scan pulse waveform supply part positioned on the supply path. delete An energy recovery switching unit connected to a scan driving IC and an energy storage unit to provide a path for recovering energy supplied to the panel to the energy storage unit; A sustain pulse waveform supply unit and a ground voltage supply unit located on the recovery path; An energy supply switching unit connected to the scan driving IC and the energy storage unit and providing a path for supplying energy charged in the energy storage unit to the panel; And a setup ramp waveform supply unit, a selection power supply unit, a set down lamp, and a scan pulse waveform supply unit positioned on the supply path. delete delete delete An energy supply switching unit connected to a scan driving IC and an energy storage unit to provide a path for supplying energy charged in the energy storage unit to the panel; A sustain pulse waveform supply unit, a ground voltage supply unit and a selection power supply unit located on the supply path; An energy recovery switching unit connected to the scan driving IC and the energy storage unit and providing a path for recovering energy supplied to the panel to the energy storage unit; And a setup ramp waveform supply unit, a set down lamp, and a scan pulse waveform supply unit positioned on the recovery path. delete delete The method of claim 2, The scan driving IC And outputting a signal input from the outside to the panel. The method of claim 2, The energy storage unit A plasma display panel driving device comprising a capacitor connected to a ground and an inductor connected thereto. The method of claim 2, The setup ramp waveform supply unit And a setup ramp waveform applied to the panel by being connected to the scan driving IC and a setup lamp driving power supply (Vsetup). The method of claim 2, The ground voltage supply unit And a ground voltage applied to the panel by being connected to the scan driving IC and ground (GND). The method of claim 2, The sustain pulse waveform supply unit And a sustain pulse waveform applied to the panel by being connected to the scan driving IC and a sustain driving power source (Vs). The method of claim 2 The set down ramp and the scan pulse waveform supply unit And a set down ramp waveform and a scan pulse waveform applied to the panel by being connected to the scan driving IC, a set down lamp, and a scan driving power supply (-Vy).

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