KR100637515B1 - Plasma display device and driving method thereof - Google Patents

Abstract

A plasma display device and a driving method thereof are provided to prevent low discharge during a sustain period by increasing the width of sustain discharge pulse and the difference between voltages applied to scan and sustain electrodes at high temperature during the sustain period by a control unit. A method for driving a plasma display device having a plasma display panel including first and second electrodes(X,Y) includes the steps of: detecting the temperature of the plasma display panel; making the voltage difference between the first and second electrodes correspond to third voltage by applying the first voltage to the first electrode and the second voltage to the second electrode during the sustain period, if the detected temperature is lower than a predetermined temperature value; and making the voltage difference between the first and second electrodes, higher than the third voltage by applying the first voltage to the first electrode and fourth voltage lower than the second voltage to the second electrode during the sustain period, if the detected temperature is higher than the predetermined temperature value.

Description

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

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

2 is a diagram illustrating an operation of a controller according to an exemplary embodiment of the present invention.

3 is a driving waveform diagram of a plasma display when the panel temperature is lower than a predetermined temperature.

4 is a diagram illustrating a plasma display device according to a first embodiment of the present invention.

5 is a diagram illustrating a plasma display device according to a second embodiment of the present invention.

6 is a diagram illustrating a plasma display device according to a third embodiment of the present invention.

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.

In general, a plasma display device is driven by dividing one frame into a plurality of subfields having respective weights. 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.

The plasma display device has a discharge voltage and a discharge characteristic that vary depending on the temperature of the plasma display device. In particular, although the discharge delay becomes small at a temperature higher than a predetermined temperature, the plasma display device has a characteristic that the opposite discharge of the scan electrode Y and the address electrode A occurs well at a high temperature. ) And the discharge between the address electrode A are large, and the discharge between the scan electrode Y and the sustain electrode X is relatively weakened.

That is, when the temperature is high, a large amount of positive wall charges and negative wall charges are formed on the scan electrode Y and the address electrode A, respectively, in the address period, but relatively small on the sustain electrode X. Positive (-) wall charges are formed so that sustain discharge between scan electrode Y and sustain electrode X cannot be stably generated in subsequent sustain periods.

In addition, when the temperature is increased, the charge is active and the response speed of the discharge is increased. Thus, the overcharged charge in the reset period is rather self-erased or escapes to the surrounding discharge cells before the sustain electrode pulse is applied. The charges do not accumulate properly, and thus a low discharge problem occurs in which sustain discharge is not properly performed in the sustain period.

SUMMARY OF THE INVENTION The present invention is directed to a plasma display device and a driving method thereof for preventing low discharge generated in a sustain period when the temperature is higher than a predetermined reference temperature.

According to an aspect of the present invention, there is provided a method of driving a plasma display device including a plasma display panel including a plurality of first and second electrodes.

Sensing a temperature of the plasma display panel; When the sensed temperature is lower than a predetermined temperature, applying a voltage to the first and second electrodes such that a first voltage, which is a voltage difference between the first electrode and the second electrode, becomes a second voltage in a sustain period; And when the sensed temperature is higher than the predetermined temperature, applying a voltage to the first and second electrodes such that the first voltage becomes a third voltage higher than the second voltage in the sustain period.

According to another aspect of the present invention, there is provided a method of driving a plasma display device including a plasma display panel including a plurality of first electrodes and a second electrode.

 Sensing a temperature of the plasma display panel; If the sensed temperature is lower than a predetermined temperature, applying a sustain discharge pulse having a first pulse width in a sustain period; And when the sensed temperature is higher than a predetermined temperature, applying a sustain discharge pulse having a pulse width longer than the first pulse width in the sustain period.

According to another aspect of the present invention, a plasma display device includes a plasma display panel including a plurality of first electrodes and a second electrode, a temperature sensing unit sensing a temperature of the plasma display panel, and a temperature detected by the temperature sensing unit is predetermined. When the temperature is lower than, the first voltage, which is a voltage difference between the first electrode and the second electrode, is controlled so that a second voltage is applied in the sustain period, and the temperature transmitted from the temperature sensing unit is higher than the predetermined temperature. And a controller configured to control the first voltage to be a third voltage higher than the second voltage in the sustain period.

According to another aspect of the present invention, a plasma display device includes a plasma display panel including a plurality of first electrodes and a second electrode, a temperature sensing unit sensing a temperature of the plasma display panel, and a temperature transmitted from the temperature sensing unit. When the temperature is lower than the predetermined temperature, the sustain discharge pulse having the first pulse width is applied to the first and second electrodes in the sustain period, and when the temperature transmitted from the temperature sensing unit is higher than the predetermined temperature, the sustain voltage is maintained. And a control unit controlling a sustain discharge pulse having a pulse width longer than the first pulse width in the period to be applied to the first and second electrodes.

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.

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. 1.

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

As shown in FIG. 1, 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, and a scan electrode driver 500. And a temperature sensing unit 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 A driving control signal, a sustain electrode X driving control signal, and a scan electrode Y driving control signal. 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. At this time, the control unit 200 according to the temperature of the plasma display panel 100 received from the temperature sensing unit 600 or the ambient temperature of the plasma display panel voltage of the sustain discharge pulse applied to the scan electrode (Y) in the sustain period. The scan electrode Y driving control signal is output so that the level is variable.

The address electrode driver 300 receives the address electrode A 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 X driving control signal from the controller 200 and applies a driving voltage to the sustain electrode X.

The scan electrode driver 500 receives the scan electrode Y 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, an operation of the controller in the plasma display device according to an exemplary embodiment of the present invention will be described in detail with reference to FIGS. 2 and 3.

2 is a view illustrating an operation of the controller illustrated in FIG. 1, and FIG. 3 is a driving waveform diagram of a plasma display device when the panel temperature is a predetermined temperature.

As shown in FIG. 2, the controller 200 receives the temperature of the plasma display panel 100 or the ambient temperature of the plasma display panel 100 detected by the temperature sensing unit 600 and compares it with a predetermined reference temperature. (S410-S420). At this time, when the detected temperature is lower than the reference temperature, the control unit 200 transmits the sustain discharge pulse having the voltage difference Vs and the pulse width T1 in the sustain period as shown in FIG. 3 to the scan electrode Y and the sustain electrode X. Outputs a control signal to be applied alternately to (S440)

On the other hand, when the detected temperature is higher than the reference temperature, the controller 200 outputs a control signal to increase the voltage difference or pulse width applied to the scan electrode Y and the sustain electrode X in the sustain period (S430). In the period of time, the discharge between the scan electrode Y and the sustain electrode X is controlled (S450). Here, the predetermined temperature can be obtained through an experimental method as the temperature of the point where low discharge occurs in the sustain period. The detailed method thereof will be omitted since it can be easily understood by those skilled in the art.

First, the case where the sensed temperature is lower than the predetermined reference temperature will be described in detail with reference to FIG. 3.

3 is a driving waveform diagram of a plasma display when the panel temperature is lower than a predetermined temperature.

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, 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.

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 formed on the address electrode A as well.

Subsequently, in the sustain period, the sustain discharge pulse of the Vs voltage is applied to the scan electrode Y and the sustain electrode X alternately. 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 occurs at the scan electrode Y and the sustain electrode X by the wall voltage and the Vs voltage. That is, sustain discharge pulses having the same pulse width T1 and having a Vs voltage are alternately applied to the scan electrode Y and the sustain electrode X.

Next, an embodiment of preventing low discharge that may occur in a sustaining period when the sensed temperature is higher than a predetermined reference temperature will be described in detail with reference to FIGS. 4 to 6.

However, in Fig. 4 to Fig. 6, since the driving waveforms of the reset period and the address period are the same as in the case of Fig. 3, overlapping portions are omitted, and only for the scan electrode Y and the sustain electrode X in the sustain period. Shown.

4 is a view showing a driving waveform of the plasma display device according to the first embodiment of the present invention.

According to the first embodiment of the present invention, since the opposite discharge occurs well at a high temperature, the discharge between the scan electrode Y and the address electrode A is large in the address period so that the scan electrode Y and the sustain electrode X are relatively high. Discharge between the terminals becomes weak. In this state, when the sustain discharge voltage Vs is alternately applied to the scan electrode Y and the sustain electrode X, a negative Vb1 voltage lower than the reference voltage is applied to the scan electrode Y and the sustain electrode X, respectively. Is authorized.

In other words, in the case of the high temperature, the difference in the voltage level is applied by applying the negative voltage Vb1 instead of the reference voltage (0V) to the sustain discharge pulses applied to the scan electrode Y and the sustain electrode X during the sustain period. Vs-Vb1 | To be

This compensates for the wall charges not accumulating properly in the address period at high temperatures.

5 is a diagram illustrating driving waveforms of the plasma display device according to the second exemplary embodiment of the present invention.

As shown in FIG. 5, the driving waveform according to the second embodiment of the present invention applies a voltage Vs + Vb2 higher than the voltage Vs as the sustain discharge voltage in order to increase the voltage difference between the scan electrode and the sustain electrode in the sustain period. Except for the same as the first embodiment. Here, the voltage Vb2 is a positive voltage having the same magnitude as the negative voltage Vb1 in the first embodiment.

That is, in order to compensate for the wall charges in the address period not accumulating properly in the case of high temperature (that is, to prevent low discharge in the sustain period), a sustain discharge voltage is applied (Vs + Vb2) higher than the Vs voltage. .

In other words, in the case of the high temperature, the difference between the voltage levels is (Vs) by alternately applying the reference voltage (0V) and (Vs + Vb2) to the sustain discharge pulses applied to the scan electrode (Y) and the sustain electrode (X) during the sustain period. + Vb2).

6 is a view showing a driving waveform of the plasma display device according to the third embodiment of the present invention.

As shown in FIG. 6, in the third embodiment of the present invention, when the sensed temperature is higher than the reference temperature, it is applied to the sustain electrode X and the scan electrode Y to prevent low discharge that may occur in the sustain period. The sustain discharge pulse width is made longer than in the case of low temperature.

As shown in Fig. 6, in the case of high temperature, the width T2 of the sustain discharge pulse is made longer than the width T1 of the sustain discharge pulse shown in Fig. 3 in order to prevent low discharge that may occur in the sustain period.

That is, at high temperatures, the charge is active and the response speed of the discharge is increased. Thus, the wall charge is properly caused by the overcharge accumulated in the reset period rather than self-erasing or exiting to the surrounding discharge cell before the sustain electrode pulse is applied. Since it does not accumulate, the width of the sustain discharge pulse is lengthened in order to prevent low discharge. Therefore, in the case of high temperature, the wall charges are not properly accumulated in the address period.

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, at a high temperature higher than a predetermined temperature, the controller controls the voltage difference applied to the scan electrode Y and the sustain electrode X in the sustain period and the width of the sustain discharge pulse to increase the low discharge in the sustain period. Can be prevented.

Claims (6)

A method of driving a plasma display device including a plasma display panel including a plurality of first electrodes and a second electrode, the method comprising: A first step of sensing a temperature of the plasma display panel; When the sensed temperature is lower than a predetermined temperature, a voltage difference between the first electrode and the second electrode is applied by applying a first voltage to the first electrode and a second voltage to the second electrode in the sustain period. A second step of bringing to three voltages; And When the sensed temperature is higher than the predetermined temperature, the first voltage is applied to the first electrode and a fourth voltage lower than the second voltage is applied to the second electrode in the sustain period. And driving a voltage difference between the second electrodes to be greater than the third voltage. The method of claim 1, And wherein the second voltage is a ground voltage. delete delete A plasma display panel including a plurality of first electrodes and a second electrode, A temperature sensing unit sensing a temperature of the plasma display panel; When the sensed temperature is lower than a predetermined temperature, a first voltage is applied to the first electrode and a second voltage is applied to the second electrode in the sustaining period so that the voltage difference between the first electrode and the second electrode is third. Voltage, When the sensed temperature is higher than the predetermined temperature, the first voltage is applied to the first electrode and a fourth voltage lower than the second voltage is applied to the second electrode in the sustain period. And a controller configured to make the voltage difference between the second electrodes larger than the third voltage. delete

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