KR100680224B1 - Plasma display panel device and the operating method of the same - Google Patents

Abstract

A plasma display device and a driving method thereof are provided to prevent a high-temperature error in discharge by varying a scan voltage applied to a scan electrode, according to temperature. A plasma display device includes a scan driver(120) having plural switches(S1~S5). The switches apply scan pulses on respective scan electrodes(Y1~Y5). When an address period begins, a scan pulse is sequentially applied on the scan electrodes irrespective of an image signal. The first scan switch is turned on and a negative voltage is applied on the first scan electrode, so that the scan pulse is applied on the first scan electrode. The rest scan switches are sequentially turned on, so that the scan pulses are applied on the scan electrodes. At the application timing of the scan pulse, a positive data pulse is applied on an address electrode, so that an address discharge is generated between scan and address electrodes. The address electrode is formed to cross the scan electrode.

Description

Plasma display device and its driving method {Plasma display panel device and the operating method of the same}

1 is a diagram illustrating a structure of a general plasma display panel;

2 is a view showing a driving waveform applied to a plasma display panel according to the prior art;

3 is a block diagram showing the configuration of a plasma display device according to the present invention;

4A is a diagram showing a plasma display panel;

4B is a diagram showing a switch timing for writing image data in the plasma display panel of FIG. 4A;

5 illustrates a plasma display panel in which scan electrodes are divided into two parts;

FIG. 6 is a diagram illustrating a driving waveform applied to the plasma display panel of FIG. 5;

7 illustrates a plasma display panel in which scan electrodes are divided into M portions;

8 is a diagram illustrating a driving waveform applied to the plasma display panel of FIG. 7.

<Explanation of symbols on main parts of the drawings>

X: address electrode Y: scan electrode

110: data driver 120: scan driver

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display device and a driving method thereof, and more particularly, to a plasma display device and a driving method thereof capable of preventing high temperature mis-discharge by varying a scan electrode applied according to a temperature.

A plasma display panel is a display device in which vacuum ultraviolet rays (VUV) generated by discharging gas inside a panel collide with phosphors inside the panel to generate light. As shown in FIG. 1, the plasma display panel includes a front substrate A and a rear substrate B. As shown in FIG.

The front substrate A includes a scan electrode 1 and a sustain electrode 2 sequentially formed, a dielectric layer 3 stacked on the scan electrode and the sustain electrode, and a dielectric protective layer 4 formed on the dielectric layer. )

The scan electrode 1 and the sustain electrode 2 each have a relatively wide width and transparent electrodes 1a and 2a made of a transparent electrode material (ITO) to transmit visible light, and have a relatively narrow width. It is composed of bus electrodes 1b and 2b made of a metallic material provided to compensate for sheet resistance of the electrode.

When a driving signal for driving the plasma display panel is supplied to the scan electrode 1 and the sustain electrode 2, wall charges are accumulated in the dielectric layer 3, and the dielectric layer protective film 4 is formed by sputtering the dielectric layer ( 3) prevent damage and increase the emission efficiency of secondary electrons.

An address electrode 6 is formed on the rear substrate B so as to be orthogonal to the scan electrode 1 and the sustain electrode 2, and a dielectric layer 8 in which wall charges are accumulated on the address electrode is sequentially formed.

On the dielectric layer 8, the partition 7 partitioning the discharge space and the side surface of the partition and the bottom surface of the discharge space are excited by the ultraviolet rays generated by the discharge and are visible in any one of red, green or blue. Phosphor 9 for generating light is formed.

The plasma display panel displays a screen by discharging the plurality of address electrodes X arranged in the column direction and the plurality of scan electrodes Y and the sustain electrodes Z arranged in the row direction.

As shown in FIG. 2, the driving waveform includes a reset period R, an address period A, and a sustain period S. During the reset period, a setup reset signal R_up and a set down reset signal R_dn are generated. When the setup reset signal is supplied, reset discharge is generated between the scan electrode (Y) and the sustain electrode (Z), and wall charges are accumulated in the dielectric layers on the scan electrode and the sustain electrode, and a set-down reset signal is supplied. When the wall charge inside the discharge cell is erased, the operating margin of the driving circuit is secured.

During the reset period R, a high voltage of 300 V or more is applied to the scan electrode Y to initialize the discharge cells so that the discharge cells are initialized so that uniform wall charges are formed in the discharge cells.

During the address period A, a data pulse having a positive polarity is applied to the address electrode X according to the image data, and a scan of negative polarity opposite to the data pulse is applied to the scan electrode Y. The pulse is supplied, and in the case of the cell to which the data pulse is applied, an address discharge occurs due to the voltage difference between the data pulse and the scan pulse.

During the sustain period S, a sustain pulse is alternately supplied to the scan electrode Y and the sustain electrode Z. When a sustain pulse is supplied to the cell where the address discharge is generated, the sustain discharge is generated and the screen is displayed.

When an address discharge is generated between the address electrode X and the scan electrode Y during the address period A, positive (+) wall charges are formed on the scan electrode Y, and the sustain electrode Z ), Negative wall charges are formed.

When the sustain period S starts, a positive polarity sustain pulse is first applied to the scan electrode Y, and as the amount of wall charges formed on the scan electrode Y and the sustain electrode Z increases, Since the wall voltage difference between the scan electrode and the sustain electrode is large, sustain discharge can be efficiently generated.

In this case, in the case of the scan electrode Y positioned at the lower end of the plasma display panel, a scan pulse is applied to the second half of the address period A, and when a data pulse is applied when the scan pulse is applied, an address discharge is caused.

Since the scan electrode (Y) and the address electrode (X) are orthogonal to each other, the data pulses applied to the opposite discharge with the scan electrode (Y) located at the upper end of the plasma display panel are not only the scan electrode (Y) located at the upper end. In addition, it affects the scan electrode (Y) located at the lower end.

That is, in the case of the scan electrode Y positioned at the lower end of the plasma display, a negative polarity Vy voltage is applied to the scan electrode Y until an address discharge occurs, but the address electrode X is formed to be orthogonal. As a data pulse is applied, an influence is generated on the wall charges formed on the scan electrodes.

Even when a scan pulse is not applied to the scan electrode Y, when a positive data pulse is applied to the address electrode X, the voltage difference between the scan electrode Y and the scan electrode Y is changed. Will occur.

Accordingly, the negative polarity of the wall charges formed on the scan electrode Y disappears, so that an address discharge may not occur even when a scan pulse is applied to the scan electrode.

In addition, when the wall charges formed on the scan electrode Y are disturbed, even when a data pulse is not applied, a weak discharge occurs even when a data pulse is applied to the address electrode X formed to cross the scan electrode Y. Done.

In this case, address discharge does not occur even when a scan pulse is applied to the scan electrode (Y). If no address discharge is generated, an erroneous discharge is generated in which the sustain discharge is not generated even when a sustain pulse is applied during the sustain period S. That is, an on cell to be turned on becomes an off cell.

The wall charges formed on the scan electrode Y are affected by the data pulse applied to the address electrode X. As the temperature of the plasma display panel increases, the scan electrode positioned at the lower end of the plasma display panel increases. Misdischarge phenomenon occurs mainly. In the case of the scan electrode positioned at the lower end of the plasma display panel, the scan electrode is continuously affected by a data pulse applied to the address electrode X formed to intersect the scan electrode for a substantial portion of the address period A. The wall charges formed in the wall tend to be offset.

The present invention has been made to solve the above problems of the prior art, by varying the scan voltage applied to the scan electrode according to the temperature to prevent the wall charge formed as the temperature of the plasma display panel rises to prevent the high temperature error It is an object of the present invention to provide a plasma display device and a driving method thereof capable of eliminating discharge.

The plasma display device according to the present invention for solving the above problems is characterized in that it comprises a drive unit for applying different scan voltage to the first scan electrode and the second scan electrode during the address period.

In this case, the driver applies a scan voltage greater than the scan voltage applied to the first scan electrode to the second scan electrode, and the scan voltage applied to the second electrode is applied to the first electrode. It is characterized in that more than 10% greater than the scan voltage.

In the plasma display panel driving method of the present invention, the voltage difference between the first scan electrode and the address electrode and the voltage difference between the second scan electrode and the address electrode are different from each other in the address period. do.

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

As shown in FIG. 3, the plasma display panel includes a plurality of address electrodes X arranged in a column direction, a plurality of scan electrodes Y and a sustain electrode Z arranged in a row direction. . The scan electrodes are formed corresponding to the sustain electrodes, and one end of the sustain electrodes is connected to each other, and the same voltage is applied thereto.

The plasma display panel is formed by bonding a front panel on which the scan electrode Y and the sustain electrode Z are alternately horizontally formed, and a back panel on which the address electrode X is formed, wherein the scan electrode and the sustain electrode and the address are joined. The electrodes are disposed to face each other with the discharge space interposed therebetween vertically, and the discharge space at the intersection of the scan electrode and the sustain electrode and the address electrode forms a basic discharge cell.

In order to drive the plasma display panel, the data driver 110 applies data to the address electrodes X1 to Xm, the scan driver 120 to drive the scan electrodes Y1 to Yn, and the sustain electrode Z. It includes a sustain drive unit 120 for driving the control unit 140 for controlling the drive unit (110 to 130).

The data driver 110 samples and latches data in response to a timing control signal from the controller 140, and then supplies the data to the address electrodes X1 to Xm (hereinafter, X).

The scan driver 120 supplies scan pulses and sustain pulses to the scan electrodes Y1 to Yn (hereinafter referred to as Y) under the control of the controller 140, and the sustain driver 130 controls the controller 140. The control unit alternately operates with the scan driver 120 to supply a sustain pulse to the sustain electrode Z.

The control unit 140 receives a vertical / horizontal synchronization signal and a clock signal to generate timing control signals CTRX, CTRY, and CTRZ required for each of the driving units 110 to 130, and the driving unit corresponding to the timing control signal ( 110 to 130 to control the driving unit.

The plasma display panel is driven by dividing one frame into one or more subfields having different numbers of discharges in order to express gray scale, and the subfields are largely reset period (R), address period (A), and sustain period. (S) consists of.

In the reset period R, a high voltage is equally applied to all discharge cells regardless of whether the discharge cells are on or off in the previous subfield. In order to make all the discharge cells in the same state, the scan driver 120 applies a high voltage of 250 V or more to the scan electrode Y to initialize the discharge cells, and mainly uses a ramp waveform to improve contrast. do. In this case, a voltage of a ground (GND) level is normally applied to the sustain electrode Z and the address electrode X, but is biased to the sustain electrode Z in order to enhance the discharge generated during the reset period R. A voltage may also be applied.

In the address period A, image writing is performed to each discharge cell. A data pulse of positive polarity is applied to the address electrode X according to the image data, and the scan electrode Y is provided to the address electrode. A scan pulse having a polarity opposite to that of the applied voltage is applied. An address discharge is generated by adding a voltage difference between the address electrode and the voltage applied to the scan electrode and the voltage of the wall charges formed during the reset period (R).

In the sustain period S, a pulse Vs signal having opposite polarity is alternately applied to the scan electrode Y and the sustain electrode Z to generate a sustain discharge and display the screen.

In order to express 256 levels of gray, the plasma display panel divides one frame (16.7 ms) into a plurality of subfields, and the reset period R and the address period A of each subfield are the same, but the sustain period is the same. (S) has a different number of sustain pulses for each subfield, so that the number of sustain discharges generated in the subfield is different.

4B is a switch provided in the scan driver 130 and the data driver 120 to apply a signal to the scan electrode Y and the address electrode X during an address period in order to display a screen on a plasma display panel. The on / off timing chart of (S1 to S5, D1 to D4) is shown.

As shown in Fig. 4A, assume that the hatched cells are turned on and the screen is displayed. The scan driver 130 includes a plurality of switches S1 to S5 to apply scan pulses to the scan electrodes Y1 to Y5.

When the address period A starts, scan pulses scp are sequentially applied to the scan electrodes Y1 to Y5 irrespective of an image signal. In order to apply the scan pulse scp1 to the first scan electrode Y1, the first scan switch S1 is turned on so that a negative voltage (-Vy) is applied to the scan electrode Y1. . Thereafter, scan pulses scp2 to scp5 are sequentially applied to the other scan lines Y2 to Y5. To this end, the second to fifth scan switches S2 to S5 are sequentially conducted so that -Vy is sequentially applied to the scan electrodes Y2 to Y5.

When a positive (+) polarity data pulse dp is applied to the address electrode X which is formed orthogonal to the scan electrode at the time when the scan pulse scp is applied to the scan electrode Y, the scan electrode and the address electrode The on-cell on which the inter-address discharge has been generated is determined.

For example, in order for the upper left second cell to be turned on, the data pulse dp1 must be applied to the second address electrode X. The time point at which the data pulse is applied is the first scan electrode Y1. This should be the same as when the scan pulse scp1 is applied.

As shown in FIG. 4B, since no data pulse is applied to the first address electrode X1, even if scan pulses scp1 to scp5 are applied to the scan electrodes Y1 to Y5 that cross the first address electrode, the address is not applied. No discharge occurs.

When the data pulses dp1 to dp5 are continuously applied to the second address electrode X2, the address discharge is generated when the scan pulses sc1 to scp5 are applied to the scan electrodes Y1 to Y5 that cross the second address electrode. Is generated. That is, all of the discharge cells located at the intersection where the second address electrode X2 and the scan electrodes Y1 to Y5 cross each other become on-cells.

The data pulses dp6 and dp7 are applied to the third address electrode X2 only during the periods t0 to t1 and t2 to t3. Accordingly, only the scan electrodes Y1 and Y3 to which scan pulses scp1 and scp3 are applied during the periods t0 to t1 and t2 to t3 among the scan electrodes formed to cross the third address electrode. That is, the address discharge is generated as an on-cell only in the discharge cells at positions where the second address electrode X2 and the first and third scan electrodes Y1 and Y3 cross each other.

In this case, in the case of the scan electrodes Y4 and Y5 positioned at the lower end of the plasma display panel, from the time point t0 at which the address section A starts to the time points t4 and t5 at which the scan pulses scp4 and scp5 are applied. The time is longer than the scan electrodes Y1 to Y3 located at the upper end of the panel.

When the reset period R is completed, negative (-) wall charges are formed on the scan electrode (Y), and positive (+) wall charges are formed on the address electrode (X) and the sustain electrode (Z). It is. The scan voltage Vsc is applied to the scan electrode and the ground level voltage is applied to the address electrode X until the address period A starts and the scan pulse scp is applied to the scan electrode Y. do.

Therefore, when the time elapses until the scan pulse scp is applied to the scan electrode Y, the wall charges formed on the scan electrode Y and the address electrode X are canceled, and thus the scan pulse scp and the data pulse ( Even if dp) is applied, there is a case where address discharge does not occur.

That is, since the wall voltage inside the discharge cell is reduced, sufficient voltage is not formed to generate an address discharge even when the scan pulse scp and the data pulse dp are applied.

This phenomenon is weighted as the time from the time point t0 at which the address period A starts to the time when the scan pulse scp is applied. In addition, as the plasma display panel is driven, address mis-discharge occurs more frequently as the panel temperature increases due to heat generation.

If no address discharge is generated in the on-cell during the address period A, even if a sustain pulse is applied during the sustain period S, a sustain discharge does not occur normally, and thus an erroneous discharge in which the discharge cell is not turned on occurs.

This phenomenon occurs because an address discharge occurs because the voltage difference between the scan electrode Y and the address electrode X is not large enough to generate an address discharge at the time when the scan pulse scp is applied to the scan electrode Y. Not due.

Therefore, the plasma display apparatus of the present invention includes a scan driver 120 that varies the scan voltage Vsc applied during the address period A. FIG.

That is, as shown in FIG. 6, the scan driver 120 applies the scan voltage Vsc2 applied to the scan electrode Y ′ positioned at the lower end of the plasma display panel to the scan electrode Y positioned at the lower end of the panel. It becomes greater than the scan voltage Vsc1.

In the case of the scan electrode Y 'disposed at the lower end of the plasma display panel, the time from the start of the address period A to the time when the scan pulse scp is applied is longer than that of the scan electrode Y located at the upper end. By applying a scan voltage Vsc2 higher than the scan voltage Vsc1 applied to the scan electrode Y positioned at, the wall charges formed during the reset period R are attenuated.

As illustrated in FIG. 5, the scan driver 120 divides the plasma display panel into two parts, and the scan electrodes Y1 to Yn 'positioned at the upper end thereof have a scan voltage of about 100V to 120V, which is similar to the conventional art. Vsc1 (hereinafter, referred to as first scan voltage) is applied, and higher scan voltage (Vsc2, hereinafter referred to as second scan voltage) is applied to scan electrodes Yn '+ 1 to Yn positioned at the lower end.

At this time, the second scan voltage Vsc2 applies a voltage that is about 10% to 30% greater than the first scan voltage Vsc1. When the first scan voltage is formed at 120V, the second scan voltage is about 130V. To about 140V.

Here, the first scan voltage Vsc1 may vary according to the driving method and panel characteristics of the plasma display panel, and the second scan voltage Vsc2 varies according to the first scan voltage, but the second scan voltage Do not exceed 30% greater than the first scan voltage.

As described above, when the scan voltage Vsc2 applied to the scan electrodes Yn '+ 1 to Yn located at the lower end is increased, the scan pulse scp is applied to the scan electrodes, thereby increasing the time until the address discharge is generated. Even if the wall charges formed in the cell are erased, the scan voltage is increased, thereby reducing the wall voltage due to wall charge attenuation.

In the case of the scan electrodes Yn '+ 1 to Yn positioned at the lower part of the panel, a higher scan voltage Vsc2 is applied than the upper part to prevent wall charge attenuation formed in the discharge cell, thereby preventing address mis-writing. ) Since sustain discharge is not generated, it is possible to prevent erroneous discharge.

The scan driver 120 divides the panel into a plurality of panels, and varies the scan voltage Vsc applied to the scan electrode Y of each part. For example, the scan driver divides the plasma display panel into M pieces in a row direction, and sequentially increases the scan voltage Vsc applied to the scan electrode Y from the upper portion to the lower portion.

That is, as shown in FIG. 7, the smallest scan voltage Vsc_m1 is applied to the scan electrodes Y1 to Ym1 formed at the uppermost part M1, the scan voltage is gradually increased toward the lower end, and the lowermost part ( The largest scan voltage Vsc_mm 'is applied to the scan electrodes Ymm' to Yn formed at Mm '.

In this case, the scan voltage Vsc applied to the scan electrode Y is set to 100V to 120V or more and does not exceed 150V. However, it is noted that the minimum and maximum scan voltages applied to the scan electrodes are not limited to the present specification and may be differently calculated according to the driving circuit and panel characteristics for driving the plasma display panel. However, the scan voltage should be sequentially increased from the upper end of the panel to the lower end.

In addition, the scan driver 120 of the present invention includes a temperature sensor (not shown) for sensing the temperature of the plasma display panel. The address mis-discharge becomes worse as the temperature of the plasma display panel increases. Accordingly, the scan driver 120 includes a temperature sensor to vary the scan voltage Vsc applied according to the temperature of the plasma display panel.

That is, the scan voltage is varied so that the magnitude of the scan voltage Vsc applied increases as the temperature of the plasma display panel increases. The scan voltage Vsc increases as the temperature increases, but the scan voltage is too high. It should be about 150V or less to prevent damage.

Looking at the driving method of the plasma display device of the present invention configured as described above are as follows.

In the address period, a voltage difference between the first scan electrode and the address electrode and a voltage difference between the second scan electrode and the address electrode are different from each other.

After the scan voltage is applied to the first scan electrode, a scan voltage is applied to the second scan electrode, and the scan voltage applied to the second electrode is greater than the scan voltage applied to the first scan electrode.

Accordingly, as the scan pulse is applied to the second scan electrode and the data pulse is applied to the address electrode formed to intersect the second scan electrode, stable address discharge is performed in the discharge cells formed at the intersections of the two electrodes. Can be.

In general, in order to drive the plasma display panel, scan pulses are sequentially applied to each scan electrode instead of simultaneously applying the scan pulses to the plurality of scan electrodes.

In this case, a scan voltage is applied to the scan electrode before and after the scan pulse is applied, and in general, the scan electrode has a negative voltage. After the reset period, negative (-) wall charges are formed on the scan electrodes. When the scan electrodes have negative voltages, the formed wall charges are canceled and address discharges are generated even when a scan pulse and a data pulse are applied. It will not occur.

In order to prevent the address mis-discharge, increasing the scan voltage applied to the scan electrode may prevent the wall charges formed in the scan electrode from being canceled before the scan pulse is applied to the scan electrode.

Accordingly, when a scan pulse is applied to the scan electrode and a data pulse is applied to the address electrode formed to intersect the scan electrode, normal address discharge is generated to select a discharge cell.

In other words, if the address discharge is made stable, mis-discharge can be prevented during the sustain period, and thus stable screen display can be prevented and high-temperature mis-discharge can be prevented from occurring due to the plasma display temperature rise.

The plasma display apparatus driving method may further include a temperature sensing step of sensing a temperature of the plasma display panel so that the scan voltage applied to the plasma display panel may be varied according to the temperature of the plasma display panel.

As the temperature of the plasma display panel increases, the amount of wall charges attenuated inside the discharge cell increases until the scan pulse is applied during the address period. The amount of wall charge that is added can be reduced.

As described above, the surface treatment system of the cathode ray tube according to the present invention has been described with reference to the illustrated drawings, but the present invention is not limited by the embodiments and drawings disclosed herein, and may be applied within the scope of the technical idea. Can be.

The plasma display device and the driving method thereof according to the present invention configured as described above vary the scan voltage applied to the plasma display panel to increase the magnitude of the scan voltage applied toward the lower end of the panel to prevent address mis-discharge. That is, a scan applied according to the time from the start of the address period until the scan pulse is applied in order to prevent attenuation of the wall charge that is canceled in proportion to the time from the start of the address period until the scan pulse is applied to generate a stable address discharge. Increase the voltage As a result, stable address discharge is performed to prevent erroneous discharge from occurring.

Furthermore, there is an effect that the stable plasma display panel can be driven by varying the magnitude of the scan voltage applied according to the temperature of the plasma display panel to prevent high temperature mis-discharge.

Claims (10)

During the address period, a scan voltage is applied to the second scan electrode after the scan voltage is applied to the first scan electrode, and as the temperature increases, a scan voltage greater than the scan voltage applied to the first scan electrode is applied to the second scan electrode. Plasma display device comprising a driving unit for applying. delete delete The method of claim 1, And the driving unit applies a scan voltage greater than 10% greater than the scan voltage applied to the first scan electrode to the second scan electrode. delete In the address section, After the scan voltage is applied to the first scan electrode, a scan voltage is applied to the second scan electrode, and as the temperature increases, a scan voltage greater than the scan voltage applied to the first scan electrode is applied to the second scan electrode. A plasma display device driving method. delete The method of claim 6, The plasma display device driving method is a plasma display device driving method of sequentially increasing the applied scan voltage. The method of claim 6, The plasma display device driving method further comprises the step of sensing the plasma display panel temperature before applying the scan voltage. delete

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