KR100662375B1 - Apparatus and method for driving a plasma display panel - Google Patents

Abstract

Disclosed are a driving apparatus and a method of a plasma display panel. The device supplies a rising ramp waveform that generates a rising ramp waveform that rises from the sustain voltage to the level of the voltage charged to the charging section in the setup period of the charging section and the reset period charging the absolute value of the sustain voltage and the negative scan voltage. It is characterized by comprising a part.

Description

Apparatus and method for driving Plasma Display Panel}

FIG. 1 is a diagram exemplarily illustrating a driving waveform of a PDP supplied to two subfields.

2 is a waveform diagram of a rising ramp pulse generated by a conventional PDP driving method and supplied to a scan electrode.

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

4 is a waveform diagram of a signal generated by a driving apparatus of a plasma display panel according to the present invention and applied to a scan electrode.

5 and 6 are views for explaining the operation of the driving apparatus of the plasma display panel according to the present invention shown in FIG.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for driving a plasma display panel (hereinafter referred to as "PDP"), and in particular, to adjust the level of a set-up voltage in a reset period (RSP). The present invention relates to a PDP driving apparatus and method.

In the conventional AC type surface discharge PDP, time division driving is performed by dividing one frame into several subfields having different emission counts in order to realize gray level of an image. At this time, each subfield has a reset period for initializing the entire screen, an address period for selecting a scan line and selecting a cell from the selected scan line, and a sustain for implementing gray levels according to the number of discharges. divided into sustain periods.

FIG. 1 is a diagram illustrating a driving waveform of a PDP supplied to two subfields, in which a signal Y supplied to a scan electrode, a signal Z supplied to a sustain electrode, and a signal supplied to an address electrode are shown. X).

Referring to FIG. 1, each subfield is divided into a reset period, an address period, and a sustain period. In the reset period, the rising ramp waveform Ramp-up is simultaneously applied to all the scan electrodes Y in the setup period. During the set-down period, the rising ramp waveform Ramp-up is supplied, and then the falling ramp waveform Ramp-down falling at the positive voltage lower than the peak voltage of the rising ramp waveform Ramp-up is scanned. It is applied to the electrodes Y at the same time.

In the address period, a pulse Scan of the negative scan voltage is sequentially applied to the scan electrodes Y, and a positive data pulse data is applied to the address electrodes X. As the voltage difference between the scan pulse and the data pulse and the wall voltage generated in the reset period are added, an address discharge is generated in the cells to which the data pulse is applied.

In the sustain period, a pulse of sus of the sustain voltage is applied to the scan electrodes Y and the sustain electrodes Z alternately.

FIG. 2 is a waveform diagram of a rising ramp pulse generated by a conventional PDP driving method and supplied to a scan electrode, and is set up from the sustain voltage Vs in a set up period (SUP) of the reset period RSP. It shows the state of rising ramp pulse rising to voltage (Vsetup or 2Vs).

Referring to FIG. 2, the conventional PDP driving method may not increase the increment voltage ΔV to more than Vsetup-Vs or Vs in the setup period SUP of the reset period RSP. Therefore, when the state of the panel becomes unstable due to various factors, there is a problem that the level of the setup voltage is insufficient to cause a discharge failure.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a driving apparatus and method for a plasma display panel capable of stabilizing discharge characteristics by increasing a level of a setup voltage of a rising ramp waveform in a setup period of a reset period.

The driving device of the plasma display panel according to the present invention for achieving the above object is a voltage charged in the charging unit from the sustain voltage in the set-up period of the charging unit and the reset period to charge the absolute value of the sustain voltage and the negative scan voltage It is preferable that it is comprised by the rising ramp waveform supply part which generate | occur | produces a rising ramp waveform which rises to the level of.

Preferably, the charging unit charges the absolute value of the negative scan voltage and the sustain voltage supplied to the scan electrode as a set down voltage in the set down period of the reset period. In this case, the driving device of the plasma display panel is a panel capacitor equivalently formed by the capacitance of the panel and a first switch connected between the panel capacitor and the negative scan voltage and turned on in the set down period. It is preferable to be implemented as.

The charging unit may charge the absolute value of the negative scan voltage and the sustain voltage supplied to the scan electrode in the address period. In this case, the driving device of the plasma display panel is connected between the panel capacitor and the panel capacitor and the negative scan voltage, which are equivalently formed by the capacitance of the panel, and the negative scan voltage is applied in the address period. It is preferable that the second switch is turned on when supplied to the scan electrode.

The rising ramp waveform supply part is connected between the sustain voltage and the panel capacitor, is turned on in a sustain period, and is connected between the panel capacitor and the charging part, and is connected to a third switch to supply the sustain voltage to the scan electrode; And a fourth switch turned on in the set up period and a fifth switch connected between the charging unit and the panel capacitor supplied with the rising ramp waveform and turned on in the set up period.

In this case, the rising ramp waveform supply unit may further provide a zener diode having an anode and a cathode provided between the charging unit and the fifth switch. Alternatively, the setup period may be adjusted by adjusting a time during which at least one of the third, fourth and fifth switches is turned on.

In this case, a driving device of the plasma display panel is connected to a first diode having a positive electrode and a negative electrode connected between the sustain voltage and the charging unit, and a positive electrode connected to the contact between the fourth switch and the charging unit and the panel capacitor. It is preferable that it is comprised with the 2nd diode which has a cathode to become.

In addition, the driving method of the plasma display panel according to the present invention for achieving the above object, the step of charging the absolute value of the sustain voltage and the negative scan voltage and in the set-up period of the reset period, the charged voltage from the sustain voltage It is preferable that the step of generating a rising ramp waveform to the level of to supply to the scan electrode.

Hereinafter, a configuration and an operation of a driving apparatus of a plasma display panel according to the present invention and a driving method thereof will be described with reference to the accompanying drawings.

3 is a circuit diagram for explaining an embodiment of a driving apparatus of a plasma display panel according to the present invention, which includes a charging unit 10, a rising ramp waveform supply unit 12, a scan driver 14, a falling ramp waveform supply unit 16, It consists of a scan voltage supply part 18 and an energy recovery part 20.

FIG. 4 is a waveform diagram of a signal generated by a driving apparatus of a plasma display panel according to the present invention and applied to a scan electrode, and is a setup voltage from a sustain voltage Vs in a setup period SUP of a reset period RSP. The rising ramp pulse rising to (Vs + ΔV) is shown.

The charging unit 10 according to the present invention charges the absolute value Vy of the sustain voltage Vs and the negative scan voltage −Vy. To this end, the charging unit 10 may be implemented as a capacitor (C1) as shown in FIG. Here, the sustain voltage Vs refers to a voltage applied alternately to the address electrode and the sustain electrode in the sustain period, and the negative scan voltage −Vy refers to a low voltage applied to the scan electrode during the address period.

At this time, the rising ramp waveform supply unit 12 is charged from the sustain voltage Vs to the charging unit 10 in the setup period SUP of the reset period RSP, and then the level of the voltage ΔV as shown in Equation 1 below. A rising ramp waveform, which rises by, is generated as shown in FIG. 4.

According to an exemplary embodiment of the present invention, the charging unit 10 maintains the absolute value Vy and the sustain voltage of the negative scan voltage (-Vy) supplied as the set down voltage to the scan electrode in the set down period of the reset period RSP. (Vs) can be charged. In this case, as shown in FIG. 3, the driving apparatus of the plasma display panel may further include a panel capacitor Cp and a falling ramp waveform supply unit 16. Here, the panel capacitor Cp means a capacitor equivalently formed by the capacitance of the panel. The falling ramp waveform supply unit 16 outputs the falling ramp waveform generated using the negative scan voltage (-Vy) as the set down voltage in the set down period to the panel capacitor Cp through the scan driver 14. do. For this purpose, the falling ramp waveform supply unit 16 is composed of a variable resistor (R1) and the first switch (S1). Here, the first switch S1 is connected between the panel capacitor Cp and the negative scan voltage (-Vy) connected via the scan driver 14, and is turned on in the set down period so that the negative scan voltage ( The falling ramp pulse generated using -Vy as the set down voltage is supplied to the panel capacitor Cp through the scan driver 14. The variable resistor R1 is connected to the gate terminal of the first switch S1 to adjust the slope of the falling ramp pulse.

According to another exemplary embodiment of the present invention, the charging unit 10 may charge the absolute value of the negative scan voltage (−Vy) and the sustain voltage Vs supplied to the scan electrode in the address period. In this case, the driving apparatus of the plasma display panel may further include a scan voltage supply unit 18 in addition to the panel capacitor Cp as shown in FIG. 3.

The scan voltage supply unit 18 may supply the negative scan voltage (−Vy) as a low level voltage to the scan electrode in the address period. To this end, the scan voltage supply unit 18 may be implemented as a second switch S2. The second switch S2 is connected between the panel capacitor Cp and the negative scan voltage (-Vy) connected via the scan driver 14, and scans the negative scan voltage (-Vy) in the address period. To be supplied, it is turned on.

Meanwhile, according to the exemplary embodiment of the present invention, the rising ramp waveform supply unit 12 is implemented by the third, fourth and fifth switches S3, S4 and S5 and the variable resistor R2 as shown in FIG. 3. Can be.

The third switch S3 is connected between the sustain voltage Vs and the panel capacitor Cp, and is turned on in the sustain period to supply the sustain voltage Vs to the scan electrode. In this case, the switches S8 and S9 and the scan driver 14 may be provided between the third switch S3 and the panel capacitor Cp. The fourth switch S4 is connected between the panel capacitor Cp and the charging unit 10 and is turned on in the setup period. Here, the switches S8 and S9 and the scan driver 14 are provided between the fourth switch S4 and the panel capacitor Cp. The fifth switch S5 is connected between the charging unit 10 and the panel capacitor Cp to which the rising ramp waveform is supplied, and is turned on in the set up period. Here, the switch S9 and the scan driver 14 are provided between the fifth switch S5 and the panel capacitor Cp. The variable resistor R2 is connected to the gate terminal of the fifth switch S5 to adjust the slope of the rising ramp pulse.

According to an embodiment of the present invention, in order to adjust the incremental voltage ΔV of the rising ramp pulse shown in FIG. 4, as shown in FIG. 3, the rising ramp waveform supply unit 12 may include the charging unit 10 and the charging unit 10. A zener diode ZD having an anode and a cathode provided between the five switches S5 may be further provided. For example, when the voltage drop between the anode and the cathode of the zener diode ZD is dv, the incremental voltage ΔV shown in FIG. 4 drops by dv. That is, it can be seen that the level of the incremental voltage ΔV can be adjusted as low as dv using the zener diode ZD.

According to another embodiment of the present invention, at least one of the third, fourth and fifth switches S3, S4 and S5 is turned to adjust the increment voltage ΔV of the rising ramp pulse shown in FIG. By adjusting the on time, the setup period can be adjusted. For example, when it is desired to lower the incremental voltage ΔV shown in FIG. 4 by dv, the driving apparatus and method of the plasma display panel according to the present invention may shorten the setup period by the time dt. To this end, the set-up period may be shortened by turning off at least one of the third, fourth and fifth switches S3, S4 and S5 earlier by the time dt.

In addition, the driving apparatus of the plasma display panel may further include first and second diodes D1 and D2 as shown in FIG. 3. Here, the first diode (D1) has a positive electrode and a negative electrode connected between the sustain voltage (Vs) and the charging unit 10, respectively, the second diode (D2) between the fourth switch (S4) and the charging unit 10 A cathode connected to the contact point and a cathode connected to the panel capacitor Cp through the scan driver 14 are provided.

The energy recovery unit 20 includes switches S11 and S12 connected in parallel between the capacitor C2 and the inductor L, and a switch S3 for supplying a sustain voltage Vs to the panel capacitor Cp. And a switch S10 for supplying a ground voltage to the panel capacitor Cp. In this case, the switch S3 may be included in the energy recovery unit 20 but may also be included in the rising ramp waveform supply unit 12. Third and fourth diodes D3 and D4 for limiting reverse current are connected in series between the switches S11 and S12.

The scan driver 14 serves to drive the scan electrode. For this purpose, the scan driver 14 may be implemented by switches S6 and S7 connected in series between the scan voltage Vscan and the falling ramp waveform supply 16.

Each of the switches S1 to S12 illustrated in FIG. 3 may be implemented as a metal oxide semiconductor field effect transistor (MOSFET), but the present invention is not limited thereto.

Hereinafter, a detailed operation of the driving apparatus of the plasma display panel according to the present invention having the above-described configuration will be described with reference to the accompanying drawings.

5 and 6 are views for explaining the operation of the driving apparatus of the plasma display panel according to the present invention shown in FIG. 3, FIG. 5 is a view for explaining the charging operation of the charging unit 10, FIG. It is a figure for demonstrating the discharge operation of the charging part 10. FIG.

In the set down period of the reset period, as shown in FIG. 5, the switches S2, S3 and S5 are turned off and the switch S1 is turned on, so that the negative scan voltage (−) at the sustain voltage Vs is reduced. A current path 40 leading to Vy) can be formed. Alternatively, in the address period, as shown in FIG. 5, the switches S1, S3, and S5 are turned off and the switch S2 is turned on, so that the negative scan voltage (-Vy) at the sustain voltage Vs is turned on. A current path 42 can then be formed. At this time, the capacitor C1 of the charging unit 10 is charged with an incremental voltage ΔV, which may be expressed as in Equation 1 above.

In the setup period of the reset period, the switches S1, S2 and S10 are turned off and the switches S3, S4, S5, S9 and S7 are turned on as shown in FIG. Therefore, the rising ramp pulse supplied to the panel capacitor Cp through the scan driver 14 is incremented from the sustain voltage Vs by the voltage charged in the charging unit 10 represented by Equation 1 shown in FIG. 4. As it rises.

Referring to the driving apparatus of the plasma display panel according to the present invention shown in FIG. 3 described above, the scan driver 14 is shown in FIG. 3 around the charging unit 10 and the rising ramp waveform supply unit 12 for convenience. Although the falling ramp waveform supply unit 16, the scan voltage supply unit 18 and the energy recovery unit 20 is provided, the present invention is not limited thereto.

As described above, the apparatus and method for driving the plasma display panel according to the present invention are configured to convert the increment voltage ΔV of the rising ramp waveform to the sustain voltage Vs and the negative scan voltage (-Vy) at the setup time of the reset period. It can be increased by the sum of the absolute value of can solve the problem of panel discharge caused by the lack of the setup voltage, it is possible to increase the incremental voltage (ΔV) without a separate power supply.

Claims (10)

A charging unit configured to charge an absolute value of the sustain voltage and the negative scan voltage; And And a rising ramp waveform supply unit for generating a rising ramp waveform that rises from the sustain voltage to a level of the voltage charged in the charging unit in a setup period of a reset period. The method of claim 1, wherein the charging unit And an absolute value of the negative scan voltage and the sustain voltage supplied to the scan electrode as a set down voltage in the set down period of the reset period. The driving apparatus of claim 2, wherein the plasma display panel is driven. A panel capacitor equivalently formed by the capacitance of the panel; And And a first switch connected between the panel capacitor and the negative scan voltage and turned on in the set down period. The method of claim 1, wherein the charging unit And the sustain voltage and the absolute value of the negative scan voltage supplied to the scan electrode in the address period. The driving apparatus of claim 4, wherein the plasma display panel is driven. A panel capacitor equivalently formed by the capacitance of the panel; And And a second switch connected between the panel capacitor and the negative scan voltage and turned on when the negative scan voltage is supplied to a scan electrode in the address period. The method of claim 3 or 5, wherein the rising ramp waveform supply unit A third switch connected between the sustain voltage and the panel capacitor and turned on in a sustain period to supply the sustain voltage to the scan electrode; A fourth switch connected between the panel capacitor and the charging unit and turned on in the set up period; And And a fifth switch connected between the charging unit and the panel capacitor supplied with the rising ramp waveform and turned on in the set-up period. The method of claim 6, wherein the rising ramp waveform supply unit And a zener diode having an anode and a cathode provided between the charging unit and the fifth switch. The apparatus of claim 6, wherein the set-up period is adjusted by adjusting a time during which at least one of the third, fourth, and fifth switches is turned on. The driving apparatus of claim 6, wherein the plasma display panel is driven. A first diode having a positive electrode and a negative electrode connected between the sustain voltage and the charging unit, respectively; And And a second diode having an anode connected to a contact between the fourth switch and the charging unit and a cathode connected to the panel capacitor. Charging an absolute value of the sustain voltage and the negative scan voltage; And And generating a rising ramp waveform that rises from the sustain voltage to the level of the charged voltage and supplies it to a scan electrode in a reset period of a reset period.

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