KR20050077614A - Driving apparatus of plasma display panel - Google Patents

Abstract

The present invention relates to a driving device of a plasma display panel. According to the present invention, a voltage pulse is applied to the address electrode in synchronization with the sustain voltage applied to the X and Y electrodes of the plasma display panel through the switching element. In this case, since the sustain discharge effect can be increased by using only a switch without adding a separate power supply device or circuit, the cost can be reduced.

Description

Driving device of plasma display panel {DRIVING APPARATUS OF PLASMA DISPLAY PANEL}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving method of a plasma display panel (PDP), and more particularly to a driving apparatus of a plasma display panel for improving the efficiency of sustain discharge.

Recently, flat display devices such as liquid crystal displays (LCDs), field emission displays (FEDs), and PDPs have been actively developed. Among these flat panel display devices, PDPs have advantages of higher luminance and luminous efficiency and wider viewing angles than other flat panel display devices. Therefore, the PDP is in the spotlight as a display device to replace the conventional cathode ray tube (CRT) in a large display device of 40 inches or more.

PDPs are flat display devices that display characters or images using plasma generated by gas discharge, and dozens to millions or more of pixels are arranged in a matrix according to their size. Such PDPs are classified into a direct current type (DC type) and an alternating current type (AC type) according to the shape of the driving voltage waveform applied and the structure of the discharge cell.

In the DC-type PDP, since the electrode is exposed to the discharge space as it is, the current flows in the discharge space while voltage is applied, and there is a disadvantage in that a resistance for current limitation must be made for this purpose. On the other hand, in the AC type PDP, the electrode covers the dielectric layer, so that the current is limited by the formation of a natural capacitance component, and the life is longer than that of the DC type since the electrode is protected from the impact of ions during discharge.

1 is a partial perspective view of an AC plasma display panel.

As shown in FIG. 1, the scan electrode 4 and the sustain electrode 5 covered with the dielectric layer 2 and the protective film 3 are arranged in parallel on the first glass substrate 1. A plurality of address electrodes 8 covered with the insulator layer 7 are provided on the second glass substrate 6. A partition 9 is formed on the insulator layer 7 between the address electrodes 8 in parallel with the address electrode 8. In addition, the phosphor 10 is formed on the surface of the insulator layer 7 and on both side surfaces of the partition wall 9. The first glass substrate 1 and the second glass substrate 6 have a discharge space 11 therebetween so that the scan electrode 4 and the address electrode 8 and the sustain electrode 5 and the address electrode 8 are orthogonal to each other. They are arranged to face each other. The discharge space at the intersection of the address electrode 8 and the pair of the scanning electrode 4 and the sustain electrode 5 forms a discharge cell 12.

2 shows an electrode arrangement diagram of the plasma display panel.

As shown in Fig. 2, the PDP electrode has a matrix structure of m x n. Specifically, the address electrodes A1 to Am are arranged in the column direction and the n rows of scanning electrodes Y1 to the row direction. Yn) and sustain electrodes X1 to Xn are arranged in a zigzag. Hereinafter, the scanning electrode will be referred to as "Y electrode" and the sustain electrode as "X electrode". The discharge cell 12 shown in FIG. 2 corresponds to the discharge cell 12 shown in FIG.

3 is a view showing a driving waveform diagram of a plasma display panel according to the prior art.

As shown in Fig. 3, according to the conventional PDP driving method, each subfield is composed of a reset section, an address section, and a sustain section.

The reset section serves to erase the wall charge state of the previous sustain discharge and to set up wall charge in order to stably perform the next address discharge. The address section is a section in which wall charges are accumulated on cells (addressed cells) turned on by selecting cells turned on and cells not turned on in the panel. The sustain section is a section in which a discharge for actually displaying an image on the addressed cell is applied by alternately applying a sustain discharge pulse Vs to the X electrode and the Y electrode.

In this case, the wall charge refers to a charge formed in the wall of the discharge cell (eg, the dielectric layer) close to each electrode and accumulated in the electrode. Such wall charges are not actually in contact with the electrodes themselves, but here wall charges are described as "formed", "accumulated" or "stacked" on the electrodes. In addition, wall voltage refers to the potential difference formed in the wall of a discharge cell by wall charge.

Korean Patent Laid-Open No. 2002-33664 discloses a technique for applying an address pulse to an address electrode in synchronization with a sustain pulse applied to an X electrode and a Y electrode as a method for increasing a discharge efficiency in a sustain period according to the conventional driving waveform. have. In this way, when an address pulse is applied in synchronization with the sustain pulse, discharge can be generated for a long time, and electrons generated at the time of discharge are attracted to the address electrode to induce a large volume discharge to generate a vacuum ultra violet (VUV). The production efficiency can be increased, thereby increasing the brightness and luminous efficiency.

However, in order to apply such a driving waveform, a circuit for generating an address pulse must be separately provided in the sustaining period, thereby complicating the circuit.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a driving apparatus for a plasma display panel that generates an address pulse in a sustain period as a simple circuit.

The driving device of the plasma display panel according to the characteristics of the present invention for achieving the technical problem is a driving device of the plasma display panel including a plurality of first electrodes, second electrodes and address electrodes,

A first electrode driver for applying a driving waveform to the first electrode; An address electrode driver for applying a driving waveform to the address electrode; A first switch electrically connected between the first electrode driver and the address electrode driver to be turned on and off so that an output of the first electrode driver is transferred to the address electrode driver; And a second switch electrically connected between the address electrode driver and a first power supply for supplying a ground voltage.

The electronic device may further include an address buffer electrically connected between the first switch and the address electrode driver to adjust and output a voltage output from the first electrode driver.

The address buffer is electrically connected between the third switch and the address electrode driver.

A driving apparatus of a plasma display panel according to another aspect of the present invention is a driving apparatus of a plasma display panel including a plurality of first electrodes, second electrodes and address electrodes,

A first electrode driver for applying a driving waveform to the first electrode; A second electrode driver for applying a driving waveform to the second electrode; An address electrode driver for applying a driving waveform to the address electrode; A first switch electrically connected between the first electrode driver and the address electrode driver to be turned on and off so that an output of the first electrode driver is transferred to the address electrode driver; A second switch electrically connected between the second electrode driver and the address electrode driver to be turned on and off so that an output of the second electrode driver is transferred to the address electrode driver; And a third switch electrically connected between the address electrode driver and a first power supply for supplying a ground voltage.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention. Like parts are designated by like reference numerals throughout the specification.

First, the driving circuit of the plasma display panel according to the embodiment of the present invention will be described in detail with reference to FIG. 4.

4 is a block diagram illustrating a driving circuit of the plasma display panel according to an exemplary embodiment of the present invention.

As shown in FIG. 4, according to the embodiment of the present invention, the switches SW1 and SW2 are disposed between the Y electrode driver 100 and the A electrode driver 300 and between the X electrode driver 200 and the address electrode driver 300. The control unit (not shown) controls the on / off operation of the switches SW1 and SW2 through a predetermined control signal. Since the circuit configurations of the Y electrode driver 100, the X electrode driver 200, and the address electrode electrode driver 300 are known in the art, detailed descriptions thereof will be omitted.

In FIG. 4, the address buffer 400 serves to adjust the magnitude of the voltage delivered to the address driver 300, and may include a voltage divider circuit and the like.

In addition, the switch SW3 is connected between the ground potential and the address driver 300 to stabilize the voltage waveform transmitted to the address driver 300. Here, the chassis base can be used as the voltage source for supplying the ground potential.

In addition, as shown in FIG. 4, the waveforms may be more stably output by serially connecting the switches and the capacitors SW4-C1 and SW5-C2 between the ground potential and the address buffer 400.

Hereinafter, an operation of the driving circuit of the plasma display panel according to the embodiment of the present invention will be described with reference to FIG. 5.

FIG. 5A shows waveforms of holding sections of the driving circuit according to the first embodiment of the present invention.

As shown in FIG. 5A, in the first embodiment of the present invention, the sustain pulse Vx is applied to the X electrode and the pulse Vaa is also applied to the address electrode, and the time when the sustain pulse falls ( At a time t2 slightly earlier than t3, the pulse Vaa applied to the address electrode is first polled.

That is, at time t1, the switch SW2 of FIG. 4 is turned on and the switch SW3 is turned off. Then, the driving waveform of the X electrode driver 200 is transferred to the address buffer 400 through the switch SW2 and output to the address electrode A via the address driver 300.

Thereafter, when the switch SW2 is turned off and the switch SW3 is turned on at a time t2 after a predetermined time has elapsed, a ground potential is applied to the address driver 300, and a pulse Vaa applied to the address electrode is polled to the ground potential. do.

FIG. 5B shows waveforms of holding sections of the driving circuit according to the second embodiment of the present invention.

As shown in FIG. 5B, in the second embodiment of the present invention, the sustain pulse Vx is applied to the X electrode (t1) and the pulse Vaa is applied to the address electrode after a predetermined time elapses (t2). Then, the pulse Vaa applied to the address electrode is polled at a time t3 slightly earlier than the time t4 at which the sustain pulse falls.

That is, at time t2, the switch SW2 of FIG. 4 is turned on and the switch SW3 is turned off. Then, the driving waveform of the X electrode driver 200 is transferred to the address buffer 400 through the switch SW2 and output to the address electrode A via the address driver 300.

Thereafter, when the switch SW2 is turned off and the switch SW3 is turned on at a time t3 after a predetermined time has elapsed, a ground potential is applied to the address driver 300, and a pulse Vaa applied to the address electrode is polled to the ground potential. do.

Meanwhile, in the first and second embodiments of the present invention, the voltage Vaa applied to the address electrode may be set to be the same as or different from the sustain voltage Vx applied to the X electrode, and the magnitude of the voltage may be set in the address buffer 400. Controlled by

In addition, in the first and second embodiments of the present invention, a method of applying a pulse to the address electrode by using the sustain pulse applied to the X electrode has been described. Alternatively, the address electrode is applied by using the sustain pulse applied to the Y electrode. The pulse may be applied to the address electrode or the pulse may be applied to the address electrode using both the sustain pulses applied to the X electrode and the Y electrode.

Although the preferred embodiment of the present invention has been described in detail above, the present invention is not limited thereto, and various other changes and modifications are possible.

As described above, according to the present invention, a pulse for increasing the sustain discharge effect can be applied to the address electrode in the sustain period using only a switch without adding a separate power supply device or circuit, thereby reducing the cost.

1 is a partial perspective view of an AC plasma display panel.

2 is an arrangement diagram of electrodes of a plasma display panel.

3 is a driving waveform diagram of a conventional plasma display panel.

4 is a block diagram of a driving circuit of a plasma display panel according to an exemplary embodiment of the present invention.

FIG. 5A is a view showing waveforms of holding sections of the driving circuit according to the first embodiment of the present invention. FIG.

5B is a view showing waveforms of holding sections of the driving circuit according to the second embodiment of the present invention.

Claims (5)

In the driving apparatus of the plasma display panel including a plurality of first electrodes, second electrodes and address electrodes, A first electrode driver for applying a driving waveform to the first electrode; An address electrode driver for applying a driving waveform to the address electrode; A first switch electrically connected between the first electrode driver and the address electrode driver to be turned on and off so that an output of the first electrode driver is transferred to the address electrode driver; And A second switch electrically connected between the address electrode driver and a first power supply for supplying a ground voltage; Driving device of the plasma display panel comprising a. The method of claim 1, An address buffer electrically connected between the first switch and the address electrode driver to adjust and output a voltage output from the first electrode driver Driving device for a plasma display panel further comprising. The method of claim 2, The address buffer is electrically connected between the third switch and the address electrode driver. Driving device of plasma display panel. The method of claim 1, A capacitor connected in parallel with the second switch to store a voltage Driving device for a plasma display panel further comprising. In the driving apparatus of the plasma display panel including a plurality of first electrodes, second electrodes and address electrodes, A first electrode driver for applying a driving waveform to the first electrode; A second electrode driver for applying a driving waveform to the second electrode; And An address electrode driver for applying a driving waveform to the address electrode; A first switch electrically connected between the first electrode driver and the address electrode driver to be turned on and off so that an output of the first electrode driver is transferred to the address electrode driver; A second switch electrically connected between the second electrode driver and the address electrode driver to be turned on and off so that an output of the second electrode driver is transferred to the address electrode driver; And A third switch electrically connected between the address electrode driver and a first power supply for supplying a ground voltage; Driving device of the plasma display panel comprising a.