KR100627295B1 - Plasma display device and driving method thereof - Google Patents

Abstract

According to the driving method of the plasma display device according to the present invention, in the reset period of each subfield, the voltage of the first electrode is gradually decreased from the first voltage to the second voltage, and the second voltage of the first electrode is decreased. Hold for a first time. At this time, the first time at a temperature higher than room temperature is made longer than the first time at room temperature, and the first time at a temperature lower than room temperature is made shorter than the first time at room temperature.

In this case, due to the characteristics of the plasma display device in which the opposite discharge of the scan electrode Y and the address electrode A occurs at high temperatures, and the opposite discharge does not occur at low temperatures, the address discharge may occur in the address period at high temperatures. It is possible to prevent the erroneous discharge, and in the case of a low temperature it is possible to prevent the low discharge that can occur due to the address discharge does not occur well in the address period.

PDP, electrode, temperature, room temperature, reset, final voltage, discharge

Description

Plasma display device and driving method thereof {PLASMA DISPLAY DEVICE AND DRIVING METHOD THEREOF}

1 illustrates a driving waveform of a conventional plasma display device.

2 is a diagram illustrating a plasma display device according to an exemplary embodiment of the present invention.

3 and 4 illustrate driving waveforms of the plasma display device according to the first and second exemplary embodiments of the present invention, respectively.

The present invention relates to a plasma display device and a driving method thereof.

Plasma display devices 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 form according to their size.

In the panel of the plasma display device, scan electrodes and sustain electrodes parallel to each other are formed on one surface thereof, and address electrodes are formed on the other surface in a direction orthogonal to these electrodes. The sustain electrode is formed corresponding to each scan electrode, and one end thereof is connected in common to each other.

1 illustrates a driving waveform of a conventional plasma display device.

In general, a plasma display device is driven by dividing one frame into a plurality of subfields having respective weights. As shown in FIG. 1, each subfield includes a reset period, an address period, and a sustain period.

The reset period serves to erase the wall charges formed by the previous sustain discharge and to set up the wall charges in order to stably perform the next address discharge. The address period is a period in which a wall charge is accumulated in a cell (addressed cell) that is turned on by selecting a cell that is turned on and a cell that is not turned on in the panel. The sustain period is a period in which sustain discharge is performed to actually display an image in the addressed cell.

In the falling period of the reset period, the voltage applied to the scan electrode Y is gradually reduced to the voltage Vnf to between the scan electrode Y and the sustain electrode X and between the scan electrode Y and the address electrode A. FIG. Cause weak discharge. However, since the discharge performed by applying a voltage between the two electrodes is delayed in time than the time when the voltage is applied, the discharge is generated. Thus, as shown in FIG. 1, the final voltage Vnf is changed during the predetermined period T1 as shown in FIG. 1. And the wall charge for addressing the scan electrode Y, the sustain electrode X, and the scan electrode Y and the address electrode A is set.

Then, in the address period, a scan pulse and an address pulse are applied to the scan electrode Y and the address electrode A, respectively, to select a cell to be discharged between the scan electrode Y and the address electrode A. FIG.

However, in the plasma display device, the discharge voltage and discharge characteristics of the panel vary with temperature. In this case, the plasma display device tends to have a lower discharge voltage when the temperature increases and a higher discharge voltage when the temperature decreases. In particular, since the opposite discharge of the scan electrode Y and the address electrode A occurs at high temperature, and the opposite discharge does not occur at low temperature, the address discharge occurs well in the address period in case of high temperature, so that the false discharge occurs. In the case of a low temperature, the address discharge may hardly occur in the address period, and thus low discharge may occur.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a plasma display device and a driving method thereof capable of stably discharging in an address period by controlling wall charges differently according to a panel temperature.

In order to solve the above problems, according to an aspect of the present invention, in a plasma display device including a plurality of first electrodes and a plurality of second electrodes formed in a direction crossing the first electrodes, one frame may be reset during each reset period. A method of driving divided into a plurality of subfields including an address period and a sustain period is provided. In this driving method, the reset period of the at least one subfield comprises gradually decreasing the voltage of the first electrode from the first voltage to the second voltage, and reducing the second voltage of the first electrode for a first time period. And maintaining said first time at a first temperature different from said first time at a second temperature. In this case, the first time at a temperature higher than room temperature may be longer than the first time at room temperature, and the first time at a temperature lower than room temperature may be shorter than the first time at room temperature.

And a plurality of third electrodes parallel to the plurality of first electrodes.

In the driving method, the second electrode and the third electrode may be biased at a constant voltage in the reset period, and sequentially applying scan pulses to the first electrode in the address period, and The method may further include applying an address pulse to a third electrode of a discharge cell to be turned on among discharge cells formed in the first electrode to which the scan pulse is applied.

According to another aspect of the present invention, a plasma display panel including a plurality of first electrodes, a plurality of second electrodes, and a plurality of third electrodes formed in a direction crossing the first electrode and the second electrode, the plasma A plasma display device includes a temperature sensing unit configured to sense a temperature of a display panel, and a driving circuit configured to apply a driving voltage to the first electrode, the second electrode, and the third electrode during a reset period, an address period, and a sustain period. .

At this time, the driving circuit, in the reset period, erases the wall charge between the first electrode and the third electrode to form a predetermined wall voltage between the first electrode and the third electrode, and in the address period, A predetermined voltage difference is formed between the first electrode and the third electrode of the discharge cell to be turned on to cause an address discharge together with the predetermined wall voltage, and the magnitude of the wall voltage is changed according to the temperature of the plasma display panel. All. That is, the magnitude of the wall voltage at the first temperature may be smaller than the magnitude of the wall voltage at the second temperature lower than the first temperature.

In addition, the driving circuit may gradually reduce the voltage obtained by subtracting the voltage of the first electrode from the third electrode from the first voltage to the second voltage, and maintain the second voltage for a predetermined period of time. In this case, the sustain period of the second voltage at the first temperature may be longer than the sustain period of the second voltage at the second temperature.

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.

In addition, the wall charge referred to in the present invention refers to a charge formed close to each electrode on the wall of the cell (eg, the dielectric layer). And the wall charge is not actually in contact with the electrode itself, but is described here as "formed", "accumulated" or "stacked" on the electrode. In addition, the wall voltage refers to the potential difference formed in the wall of the cell by the wall charge.

Now, a plasma display device and a driving method thereof according to an exemplary embodiment of the present invention will be described in detail.

First, a schematic structure of a plasma display device according to an exemplary embodiment of the present invention will be described in detail with reference to FIG. 2.

2 is a diagram illustrating a plasma display device according to an exemplary embodiment of the present invention.

As shown in FIG. 2, a plasma display device according to an exemplary embodiment of the present invention includes a plasma display panel 100, a controller 200, an address electrode driver 300, a sustain electrode driver 400, a scan electrode driver 500, and It includes a temperature sensor 600.

The plasma display panel 100 includes a plurality of address electrodes A1 to Am extending in the column direction, and a plurality of sustain electrodes X1 to Xn and scan electrodes Y1 to Yn extending in pairs in the row direction. Include. The sustain electrodes X1 to Xn are formed corresponding to the scan electrodes Y1 to Yn, and generally have one end connected to each other in common. The plasma display panel 100 includes a substrate (not shown) on which the sustain and scan electrodes X1 to Xn and Y1 to Yn are arranged, and a substrate (not shown) on which the address electrodes A1 to Am are arranged. The two substrates are disposed to face each other with the discharge space therebetween so that the scan electrodes Y1 to Yn and the address electrodes A1 to Am and the sustain electrodes X1 to Xn and the address electrodes A1 to Am are orthogonal to each other. At this time, the discharge space at the intersection of the address electrodes A1 to Am and the sustain and scan electrodes X1 to Xn and Y1 to Yn forms a discharge cell. The structure of the plasma display panel 100 is an example, and a panel having another structure to which the driving waveform described below may be applied may also be applied to the present invention.

The controller 200 receives an image signal from the outside and outputs an address electrode driving control signal, a sustain electrode driving control signal, and a scan electrode driving control signal. In this case, the controller 200 outputs a different scan electrode driving control signal according to the temperature of the plasma display panel 100 received from the temperature sensing unit 600. The controller 200 divides and drives one frame into a plurality of subfields, and each subfield is composed of a reset period, an address period, and a sustain period.

The address electrode driver 300 receives an address electrode driving control signal from the controller 200 and applies a display data signal for selecting a discharge cell to be displayed to each address electrode.

The sustain electrode driver 400 receives the sustain electrode driving control signal from the controller 200 and applies a driving voltage to the sustain electrode X.

The scan electrode driver 500 receives a scan electrode driving control signal from the controller 200 and applies a driving voltage to the scan electrode Y.

The temperature detector 600 detects the temperature of the plasma display panel 100 and transmits the temperature to the controller 200.

Next, with reference to FIGS. 3 and 4, an embodiment in which mis-discharge and low discharge that may occur in an address period when the temperature of the plasma display panel 100 is high and low will be described in detail.

First, an exemplary embodiment of the present invention which can prevent mis-discharge that may occur in an address period in the case of high temperature will be described in detail with reference to FIG. 3.

3 illustrates a driving waveform of the plasma display device according to the first embodiment of the present invention.

As shown in Fig. 3, each subfield consists of a reset period, an address period, and a sustain period, and the reset period consists of a rising period and a falling period.

In the rising period of the reset period, the scan electrode Y is increased from the Vs voltage to the Vset voltage while the sustain electrode X is held at 0V. Then, a weak reset discharge occurs from the scan electrode Y to the address electrode A and the sustain electrode X, respectively, and a negative wall charge is formed on the scan electrode Y, and the address electrode A and the A positive wall charge is formed on the sustain electrode X.

In the falling period of the reset period, the scan electrode Y is reduced from the Vs voltage to the Vnf voltage while the sustain electrode X is held at the Ve voltage. Then, the voltage of the scan electrode Y is maintained at the voltage Vnf for a predetermined time T2. Then, while the voltage of the scan electrode Y decreases, a weak reset discharge occurs between the scan electrode Y and the sustain electrode X and between the scan electrode Y and the address electrode A, and thus the scan electrode ( The negative wall charges formed on Y) and the positive wall charges formed on the sustain electrode X and the address electrode A are erased.

At this time, the Vnf voltage holding time T2 at high temperature is made longer than the Vnf voltage holding time T1 at normal temperature. As described above, since the discharge is delayed in time than when the voltage is applied, when the Vnf voltage holding time T2 is increased at a high temperature as in the first embodiment of the present invention, the wall charges formed on each electrode are erased more. In this way, erroneous discharge can be prevented in the address period.

Next, in the address period, a scan pulse having a VscL voltage is sequentially applied to the scan electrode Y to select a discharge cell, and the scan electrode to which the VscL voltage is not applied is biased to the VscH voltage. At this time, the VscL voltage is called a scan voltage, and the VscH voltage is also called a non-scan voltage. In addition, an address pulse having a Va voltage is applied to an address electrode A passing through a discharge cell to be selected from among a plurality of discharge cells formed by the scan electrode Y to which the VscL voltage is applied. A) biases to a reference voltage (0V in FIG. 3). Then, an address discharge occurs in the discharge cell formed by the address electrode A applied with the Va voltage and the scan electrode Y with the VscL voltage, and positive wall charges are formed on the scan electrode Y. A negative wall charge is formed in the sustain electrode X. In addition, a negative wall charge is also formed on the address electrode A. FIG.

Subsequently, in the sustain period, the sustain discharge pulse of the Vs voltage is sequentially applied to the scan electrode Y and the sustain electrode X. FIG. Then, when the wall voltage is formed between the scan electrode Y and the sustain electrode X by the address discharge in the address period, the discharge is generated at the scan electrode Y and the sustain electrode X by the wall voltage and the Vs voltage. Happens. Thereafter, the process of applying the sustain discharge pulse of the Vs voltage to the scan electrode Y and the process of applying the sustain discharge pulse of the Vs voltage to the sustain electrode X are repeated the number of times corresponding to the weight indicated by the corresponding subfield. .

Next, with reference to Figure 4 will be described in detail an embodiment that can prevent the low discharge that may occur in the address period in the case of low temperature.

4 illustrates a driving waveform of the plasma display device according to the second exemplary embodiment of the present invention.

As shown in Fig. 4, in the case of low temperature, the Vnf voltage holding time T3 applied to the scan electrode in the falling period of the reset period is shorter than the Vnf voltage holding time T1 at normal temperature.

Since the discharge is delayed in time than when the voltage is applied, shortening the Vnf voltage holding time T3 at a low temperature, as in the second embodiment of the present invention, can erase the wall charges formed at each electrode, thereby reducing the address period. Low discharge can be prevented from

Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

According to the present invention, the plasma display device has a characteristic in which the discharge voltage and the discharge characteristic change according to the temperature of the panel so that the opposite discharge of the scan electrode Y and the address electrode A occurs at high temperatures, and the opposite discharge does not occur at low temperatures. In the case of high temperature, address discharge may occur in an address period well in case of high discharge, and in case of low temperature, address discharge may hardly occur in address period and low discharge may occur. Therefore, as in the embodiment of the present invention, at the high temperature, the wall charges are erased much in the falling period of the reset period, and at the low temperature, the wall charges are less erased in the falling period of the reset period, thereby preventing mis-discharge and low discharge in the address period. Can be.

Claims (11)

In a plasma display device including a plurality of first electrodes and a plurality of second electrodes formed in a direction crossing the plurality of first electrodes, a plurality of subfields each include a reset period, an address period, and a sustain period. In the method of driving divided by In the reset period of at least one subfield, Gradually reducing the voltages of the plurality of first electrodes from a first voltage to a second voltage, and Maintaining a second voltage of the plurality of first electrodes for a first period of time Including; And the first period at which the temperature of the plasma display device is at a first temperature is longer than the second period at a second temperature at which the temperature of the plasma display device is lower than the first temperature. delete delete The method of claim 1, And a plurality of third electrodes parallel to the plurality of first electrodes. The method of claim 4, wherein In the reset period, And the plurality of second electrodes and the plurality of third electrodes are respectively biased at a constant voltage. The method of claim 4, wherein In the address period, Sequentially applying scan pulses to the plurality of first electrodes, and Applying an address pulse to a second electrode of a discharge cell to be turned on among discharge cells formed by each of the first electrodes to which the scan pulse is applied; The driving method of the plasma display device further comprising. A plasma display panel including a plurality of first electrodes, a plurality of second electrodes, and a plurality of third electrodes formed in a direction crossing the plurality of first electrodes and the plurality of second electrodes; A temperature sensing unit sensing a temperature of the plasma display panel; In the reset period, the voltages of the plurality of first electrodes are gradually decreased from a second voltage to a third voltage while a first voltage is applied to the plurality of third electrodes, and the first voltage is applied to the plurality of first electrodes. 3 a driving circuit for applying a voltage for a predetermined period, and A controller configured to lengthen the predetermined period as the temperature of the plasma display panel increases Plasma display device comprising a. delete delete delete The method of claim 7, wherein The drive circuit, And a fourth voltage and a fifth voltage are applied to the first electrode and the third electrode of the discharge cell to be turned on in the address period.

Images