KR100658395B1 - Plasma display apparatus and driving method thereof - Google Patents

Abstract

A plasma display device and a driving method thereof are provided to stabilize sustain discharge by reducing the difference between light waveforms of sub discharge cell fluorescent bodies emitting the light during a sustain period by including ramp pulse in the first negative sustain pulse. A plasma display device includes a plasma display panel(700) having scan electrodes(Y1~Yn) and sustain electrodes(Z); driving units(702,703,704) for driving the plasma display panel by applying a signal to the electrodes; and a pulse control unit(701) using ramp pulse as the first sustain pulse applied to one of the scan and sustain electrodes during the sustain period of a subfield and making the absolute voltage value of the first sustain pulse smaller than that of the other sustain pulses by controlling the driving units.

Description

Plasma Display Apparatus and Driving Method Thereof

1 is a diagram showing the structure of a typical plasma display panel.

2 is a view showing a coupling relationship between a plasma display panel and a driver;

3 is a diagram illustrating a method of implementing image gradation of a typical plasma display panel.

4 is a view illustrating a driving waveform according to a driving method of a conventional plasma display panel.

5 is a view illustrating a driving waveform according to a negative sustain driving method of a conventional plasma display panel;

6A and 6B are diagrams for comparing address discharge and sustain discharge in a typical plasma display panel.

7 is a diagram for explaining the structure of a plasma display device of the present invention;

8 is a view showing an example of a driving waveform according to the negative sustain driving method of the plasma display panel of the present invention.

9A and 9B are diagrams for comparing optical waveforms according to a negative sustain driving waveform of the plasma display panel of the present invention.

<Explanation of symbols for the main parts of the drawings>

700: plasma display panel 701: pulse control unit

702: data driver 703: scan driver

704: sustain driver 705: drive voltage generator

The present invention relates to a plasma display device, and more particularly, to a plasma display device and a driving method thereof which can prevent mis-discharge and over-discharge by improving a sustain pulse applied during a sustain period.

In general, a plasma display panel is a partition wall formed between a front panel and a rear panel to form one unit cell, and each cell includes neon (Ne), helium (He), or a mixture of neon and helium (Ne + He) and An inert gas containing the same main discharge gas and a small amount of xenon is filled. When discharged by a high frequency voltage, the inert gas emits vacuum ultraviolet rays to emit phosphors formed between the partition walls, thereby realizing an image. Such a plasma display panel has a spotlight as a next generation display device because of its thin and light configuration.

1 illustrates a structure of a general plasma display panel.

As shown in FIG. 1, a plasma display panel includes a front panel in which a plurality of sustain electrode pairs formed by pairing a scan electrode 102 and a sustain electrode 103 are arranged on a front glass 101 that is a display surface on which an image is displayed. The rear panel 110 on which the plurality of address electrodes 113 are arranged so as to intersect the plurality of storage electrode pairs described above on the back glass 111 forming the back surface 100 and the rear surface is coupled in parallel with a predetermined distance therebetween. .

The front panel 100 is made of a scan electrode 102 and a sustain electrode 103, that is, a transparent electrode (a) formed of a transparent ITO material and a metal material to mutually discharge and maintain light emission of the cells in one discharge cell. The scan electrode 102 and the sustain electrode 103 provided as the bus electrode b are included in pairs. The scan electrode 102 and the sustain electrode 103 are covered by one or more upper dielectric layers 104 that limit the discharge current and insulate the electrode pairs, and facilitate discharge conditions on top of the upper dielectric layer 104. In order to do this, a protective layer 105 on which magnesium oxide (MgO) is deposited is formed.

The rear panel 110 is arranged in such a manner that a plurality of discharge spaces, that is, barrier ribs 112 of a stripe type (or well type) for forming discharge cells are maintained in parallel. In addition, a plurality of address electrodes 113 are arranged in parallel with the partition wall 112 to perform address discharge so that the inert gas in the discharge cell generates vacuum ultraviolet rays. On the upper side of the rear panel 110, red (R), green (G), and blue (B) phosphors 114 which emit visible light for image display during sustain discharge are coated. A lower dielectric layer 115 is formed between the address electrode 113 and the phosphor 114 to protect the address electrode 113.

The plasma display panel having the above-described structure is provided with a plurality of discharge cells in a matrix structure, and a driving unit including a driving circuit for supplying a predetermined pulse to the discharge cells is attached and driven. The coupling relationship between the plasma display panel and the driving unit is illustrated in FIG. 2.

2 is a view illustrating a coupling relationship between a plasma display panel and a driver.

As shown in FIG. 2, the driver includes, for example, a data driver 201, a scan driver 202, and a sustain driver 203. These driving units 201, 202, and 203 are connected to the plasma display panel 200 to form one plasma display device.

Here, the plasma display panel 200 is supplied with a data pulse from the data driver 201. These data pulses are generated when an image signal input from the outside goes through a predetermined signal processing process. The plasma display panel 200 receives the scan pulse and the sustain pulse output from the scan driver 202, and the sustain pulse output from the sustain driver 203. As described above, a discharge occurs in a cell selected by the scan pulse among a plurality of cells included in the plasma display panel 200 that receives the data pulse, the scan pulse, the sustain pulse, and the like, and the discharged cell emits light with a predetermined luminance. . Here, the data driver 201, the scan driver 202, and the sustain driver 203 are connected to the address electrodes X ₁ to X _n of the plasma display panel 200 through a connection such as a flexible printed circuit (FPC) (not shown). ), Scan electrodes Y ₁ to Y _n , and sustain electrodes Z ₁ to Z _n .

A method of implementing image gradation in such a plasma display apparatus is shown in FIG. 3.

3 is a diagram illustrating a method of implementing image grayscale of a general plasma display panel.

As shown in FIG. 3, in the conventional method of expressing a gray level of a plasma display panel, a frame is divided into several subfields having different number of light emission times, and each subfield is again configured as a reset period (RPD) for initializing all cells. ) Is divided into an address period APD for selecting a cell to be discharged and a sustain period SPD for implementing gradation according to the number of discharges. For example, when displaying an image with 256 gray levels, a frame period (16.67 ms) corresponding to 1/60 second is divided into eight subfields SF1 to SF8 as shown in FIG. 3, and eight subfields. Each of the SFs SF1 to SF8 is divided into a reset period, an address period, and a sustain period.

The reset period and the address period of each subfield are the same for each subfield. The address discharge for selecting the cell to be discharged is caused by the voltage difference between the address electrode and the transparent electrode which is the scan electrode. The sustain period is increased at a rate of 2 ⁿ ( ^where n = 0, 1, 2, 3, 4, 5, 6, 7) in each subfield. In this way, since the sustain period is different in each subfield, the gray scale of the image is expressed by adjusting the sustain period of each subfield, that is, the number of sustain discharges. The driving waveform of one subfield in the method of driving the plasma display panel driven by the image gray scale implementation method is as shown in FIG. 4.

4 is a diagram illustrating a driving waveform according to a driving method of a conventional plasma display panel.

As shown in Fig. 4, the plasma display panel erases the reset period for initializing all the cells, the address period for selecting the cells to be discharged, the sustain period for maintaining the discharge of the selected cells, and the wall charges in the discharged cells. It is divided into an erase period for driving.

In the reset period, a rising ramp waveform Ramp-up is simultaneously applied to all scan electrodes in the setup period. This rising ramp waveform causes weak dark discharge in the discharge cells of the entire screen. By this setup discharge, positive wall charges are accumulated on the address electrode and the sustain electrode, and negative wall charges are accumulated on the scan electrode.

In the set-down period, after the rising ramp waveform is supplied, the falling ramp waveform (Ramp-down) begins to fall from the positive polarity voltage lower than the peak voltage of the rising ramp waveform and falls to a specific voltage level below the ground (GND) level voltage. By generating a weak erase discharge in the cells, the wall charges excessively formed in the scan electrode are sufficiently erased. By this set down discharge, the wall charges to the extent that the address discharge can be stably generated remain uniformly in the cells.

In the address period, negative polarity scan pulses are sequentially applied to the scan electrodes, and data pulses of positive polarity are applied to the address electrodes in synchronization with the scan pulses. As the voltage difference between the scan pulse and the data pulse and the wall voltage generated in the reset period are added, an address discharge is generated in the discharge cell to which the data pulse is applied. In the cells selected by the address discharge, wall charges are formed such that a discharge can occur when the sustain voltage Vs is applied. The sustain electrode is supplied with a positive voltage Vz so as to reduce the voltage difference with the scan electrode in at least one of the set down period and the address period so that no misdischarge occurs with the scan electrode.

In the sustain period, a sustain pulse Su is applied to the scan electrode and the sustain electrodes alternately. In the cell selected by the address discharge, as the wall voltage and the sustain pulse in the cell are added, a sustain discharge, that is, a display discharge, occurs between the scan electrode and the sustain electrode every time the sustain pulse is applied.

After the sustain discharge is completed, in the erase period, the voltage of the erase ramp waveform Ramp-ers having a small pulse width and voltage level is supplied to the sustain electrode to erase the wall charge remaining in the cells of the entire screen.

On the other hand, the plasma display device as described above has a relatively low potential difference as the positive sustain pulse su is alternately applied to the scan electrode Y side and the sustain electrode Z side during the sustain period. The cations are accumulated on the address electrode X side. At this time, cations with a larger mass than the electrons exert an ion bombardment on the phosphor (114 in FIG. 1) of the rear panel on which the address electrode X is formed, which shortens the lifetime of the plasma display apparatus. .

Accordingly, the recently developed negative sustain driving method is as shown in FIG. 5.

5 is a view illustrating a driving waveform according to a negative sustain driving method of a conventional plasma display panel.

Referring to FIG. 5 in conjunction with FIG. 1, as shown in FIG. 5, a sustain pulse applied to a scan electrode Y and a sustain electrode Z formed on the front panel 100 during a sustain period is negatively-connected (−). Electrons are accumulated toward the rear panel 110 having the address electrode X formed to have a voltage level of Vs). Therefore, the impact by the heavy cations applied to the phosphor 114 on the rear panel 110 can be reduced to increase the lifetime of the plasma display device.

In addition, in the process of accumulating cations on the front panel 100 side, an ion bombardment amount is increased on the magnesium oxide (MgO) layer 105 formed on the front panel 100 to improve the secondary electoral generation rate. do. That is, while preventing the loss of the phosphor 114, the secondary electron generation amount is increased to increase the lifetime of the plasma display device and lower the discharge start voltage.

However, even in such a negative sustain pulse, a difference in light occurs when the first negative sustain pulse is applied to the sub discharge cell in which the difference in wall charges due to the surface discharge of the address period is increased, which will be described in more detail with reference to FIGS. 6A and 6B. Same as

6A and 6B are diagrams for comparing address discharge and sustain discharge in a typical plasma display panel.

As shown in Figs. 6A and 6B, Fig. 6A discharges the scan electrode Y on the front panel 100 and the address electrode X on the rear panel 110, such as the address discharge generated in the address period. Fig. 1 shows a counter discharge that discharges across a cell. On the contrary, FIG. 6B is a diagram showing a surface discharge in which the scan electrode Y and the sustain electrode Z are discharged on the front panel 100, that is, on one surface, like the sustain discharge generated in the sustain period. The opposite discharge of FIG. 6A has a greater effect on the rear panel 110 than the surface discharge of FIG. 6B, and thus, the degree of deterioration of the phosphor 114 coated on the rear panel 110 is strong.

In addition, the phosphors 114 having different light emission characteristics are applied to the red (R), green (G), and blue (B) sub-discharge cells forming one discharge cell. As a result, the phosphors 114 applied to the respective sub discharge cells are strongly deteriorated due to different light emission characteristics, and thus the difference in the state of the wall charges in the address period is further deepened. When the sustain pulse is instantaneously applied to the sub discharge cells having different wall charge states in the address period at the beginning of the sustain period (first negative polarity pulse (-Vs in FIG. 5)), the difference in light generated by the sustain discharge is shown. There is a problem that is further deepened.

Accordingly, the present invention provides a plasma display device and a driving method thereof capable of controlling mis-discharge and over-discharge due to a difference in the amount of wall charges of each discharge cell formed due to the opposite discharge by improving the negative sustain pulse applied during the sustain period. The purpose is to provide.

Plasma display device according to the present invention for achieving the above object is to control the driving unit and driving unit for driving the plasma display panel by applying a signal to the plasma display panel, the scan electrode and the sustain electrode is formed, The first sustain pulse applied to at least one of the scan electrode and the sustain electrode in the sustain period of the subfield is a ramp pulse, and includes a pulse controller to make an absolute voltage smaller than the remaining sustain pulses.

In addition, the sustain period of the lamp pulse is characterized in that less than 5ms.

In addition, the first sustain pulse including a ramp pulse applied to the scan electrode and the sustain electrode is applied from the sustain electrode.
The sustain pulse is characterized in that the negative polarity.

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The difference between the absolute voltage of the first sustain pulse including the ramp pulse and the absolute voltage of the other sustain pulses is 5V or more and 20V or less.

In the plasma display device driving method according to the present invention, the first sustain pulse applied to at least one of the scan electrode and the sustain electrode in the sustain period of the subfield in the plasma display panel having the scan electrode and the sustain electrode is a lamp It is a pulse, characterized in that the absolute voltage is smaller than the remaining sustain pulse.

In addition, the sustain period of the lamp pulse is characterized in that less than 5ms.

In addition, the first sustain pulse including a ramp pulse applied to the scan electrode and the sustain electrode is applied from the sustain electrode.
The sustain pulse is characterized in that the negative polarity.

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The difference between the absolute voltage of the first sustain pulse including the ramp pulse and the absolute voltage of the other sustain pulses is 5V or more and 20V or less.

Hereinafter, a plasma display device and a driving method thereof of the present invention will be described in detail with reference to the accompanying drawings.

7 is a view for explaining the structure of the plasma display device of the present invention.

As shown in FIG. 7, the plasma display device of the present invention drives driving pulses to the address electrodes X1 to Xm, the scan electrodes Y1 to Yn, and the sustain electrode Z in the above-described reset period, address period and sustain period. Is applied and data for supplying data to the plasma display panel 700 representing an image made of a frame by the combination of at least one subfield and the address electrodes X1 to Xm formed in the plasma display panel 700. The driver 702, the scan driver 703 for driving the scan electrodes Y1 to Yn, the sustain driver 704 for driving the sustain electrodes Z which are common electrodes, and the plasma display panel 700. In driving, the scan driver 703 and the sustain driver 704 described above are controlled to adjust the supply of the reset pulse in the reset period. Generation of a driving voltage for supplying a driving voltage necessary for controlling the supply of the scan pulses of the plurality of scan pulses and for controlling the voltage or width of the sustain pulses in the sustain period, and the respective driving units 702, 703, 704. A portion 705 is included.

The data driver 702 is subjected to inverse gamma correction and error diffusion by an inverse gamma correction circuit, an error diffusion circuit, and the like not shown, and then data mapped to each subfield is supplied by the subfield mapping circuit. The data driver 702 samples and latches data in response to a data timing control signal CTRX from a timing controller (not shown), and then supplies the data to the address electrodes X1 to Xm. Done. In addition, an erase pulse is supplied to the address electrodes X1 to Xm during the erase period.

The scan driver 703 supplies the reset pulses to the scan electrodes Y1 to Yn during the reset period under the control of the pulse controller 701, the scan pulses to the scan electrodes Y1 to Yn during the address period, The negative sustain pulse is supplied to the scan electrodes Y1 to Yn during the sustain period under the control of the sustain pulse controller, and the erase pulse is supplied to the scan electrodes Y1 to Yn during the erase period.

The sustain driver 704 supplies a bias voltage having a predetermined magnitude to the sustain electrodes Z during the address period under the control of the pulse controller 701, and alternately operates with the scan driver 703 described above during the sustain period to perform negative polarity. The sustain pulse (-Vs) is supplied to the sustain electrodes Z, and the erase pulse is supplied to the sustain electrode Z during the erase period.

The pulse controller 701 is configured to control the operation timing and synchronization of the scan driver 703, the sustain driver 704, and the data driver 702 in the reset period, the address period, the sustain period, and the erase period. The control signal is supplied to each of the driving units 702, 703, 704.

In particular, the pulse control unit 701 of the present invention controls the scan driver 703 and the sustain driver 704 differently from the prior art, so that the scan electrodes Y1 to Yn or the sustain electrode Z in the sustain period of the plurality of subfields. The first negative sustain pulse applied to at least one of the electrodes) may include a ramp pulse. As a result, by reducing the difference in the wall charges of the respective sub discharge cells formed due to the counter discharge occurring in the address period, the mis-discharge and overdischarge can be controlled, thereby stabilizing the sustain discharge occurring in the sustain period. This has the effect of reducing the difference in waveforms.

At this time, the sustain period of the ramp pulse Ramp described above is adjusted to 5 ms or less. This is because when the sustain period of the ramp pulse Ramp exceeds 5 ms, the sustain period becomes long and the driving margin for sustain discharge is lowered.

In addition, the pulse control unit 701 of the present invention is such that the first negative sustain pulse including the ramp pulse (Ramp) applied to the scan electrode (Y) and the sustain electrode (Z) is applied from the sustain electrode (Z) It is more effective to apply a predetermined positive voltage (Vz) to the sustain electrode (Z) in the address period before the start of the sustain period. Therefore, a negative sustain pulse is first applied to the wall charges formed in the address period. It is to be able to drive quickly by changing the status immediately.

In addition, the pulse control unit 701 of the present invention is characterized in that the absolute voltage of the first negative sustain pulse including the ramp pulse (Ramp) is smaller than the absolute voltage of the other negative sustain pulse (-Vs), More preferably, the difference between the absolute voltage of the first negative sustain pulse including the ramp pulse Ramp and the absolute voltage of the other negative sustain pulse (-Vs) is adjusted to 5V or more and 20V or less. This makes it possible to more easily control the sustain discharge occurring at the same potential and further reduce the influence on the phosphor by applying an absolute voltage smaller than the sustain pulse.

The data control signal CTRX described above includes a sampling clock for latching data, a latch control signal, a switch control signal for controlling the on / off time of the energy recovery circuit and the driving switch element. The scan control signal CTRY includes a switch control signal for controlling on / off time of an energy recovery circuit (not shown) and a driving switch element (not shown) in the scan driver 503, and a sustain control signal CTRZ. Includes a switch control signal for controlling the on / off time of the energy recovery circuit and the driving switch element in the sustain driver 504.

The driving voltage generator 705 generates a setup voltage Vsetup, a scan common voltage Vscan-com, a scan voltage -Vy, a sustain voltage Vs, a data voltage Vd, and the like. These driving voltages may vary depending on the composition of the discharge gas or the structure of the discharge cell.

The operation of the plasma display device of the present invention of FIG. 7 will be described more clearly by the driving method of FIG. 8.

8 is a diagram illustrating an example of a driving waveform according to the negative sustain driving method of the plasma display panel of the present invention.

As shown in FIG. 8, the method of driving the plasma display apparatus of the present invention includes a reset period for initializing all cells, an address period for selecting a cell to be discharged, a sustain period for maintaining the discharge of the selected cell, and a discharged period. The driving is divided into an erase period for erasing the wall charge in the cell.

In the reset period, a rising ramp waveform Ramp-up is simultaneously applied to all scan electrodes in the setup period. This rising ramp waveform causes weak dark discharge in the discharge cells of the entire screen. By this setup discharge, positive wall charges are accumulated on the address electrode and the sustain electrode, and negative wall charges are accumulated on the scan electrode.

During the set-down period, after the rising ramp waveform is supplied, the ramp ramp begins to fall from the positive polarity voltage lower than the peak voltage of the rising ramp waveform and then falls to a specific voltage level below the ground (GND) level voltage. By generating a weak erase discharge in these cells, the wall charges excessively formed in the scan electrode are sufficiently erased. By this set down discharge, the wall charges to the extent that the address discharge can be stably generated remain uniformly in the cells.

In the address period, negative polarity scan pulses are sequentially applied to the scan electrodes, and data pulses of positive polarity are applied to the address electrodes in synchronization with the scan pulses. As the voltage difference between the scan pulse and the data pulse and the wall voltage generated in the reset period are added, an address discharge is generated in the discharge cell to which the data pulse is applied. In the cells selected by the address discharge, wall charges are formed such that a discharge can occur when the sustain voltage Vs is applied. The sustain electrode is supplied with a positive voltage Vz so as to reduce the voltage difference with the scan electrode in at least one of the set down period and the address period so that no misdischarge occurs with the scan electrode.

In the sustain period, a negative sustain pulse Su is alternately applied to the scan electrode and the sustain electrodes. In the cell selected by the address discharge, as the wall voltage and the sustain pulse in the cell are added, a sustain discharge, that is, a display discharge, occurs between the scan electrode and the sustain electrode every time the sustain pulse is applied.

After the sustain discharge is completed, in the erase period, the voltage of the erase ramp waveform Ramp-ers having a small pulse width and voltage level is supplied to the sustain electrode to erase the wall charge remaining in the cells of the entire screen.

Particularly, in the method of driving the plasma display apparatus of the present invention, the first negative sustain pulse applied to at least one of the scan electrode (Y) and the sustain electrode (Z) in the sustain period is different from the prior art. Ramp). As a result, by reducing the difference in the wall charges of the respective sub discharge cells formed due to the counter discharge occurring in the address period, the mis-discharge and overdischarge can be controlled, thereby stabilizing the sustain discharge occurring in the sustain period. This has the effect of reducing the difference in waveforms.

At this time, the sustain period of the ramp pulse Ramp described above is adjusted to 5 ms or less. This is because when the sustain period of the ramp pulse Ramp exceeds 5 ms, the sustain period becomes long and the driving margin for sustain discharge is lowered.

In addition, it is more effective that the first negative sustain pulse including the ramp pulse Ramp applied to the scan electrode Y and the sustain electrode Z is applied from the sustain electrode Z, which is a sustain period. Since the predetermined positive voltage Vz was supplied to the sustain electrode Z in the address period before this start, a negative sustain pulse was first applied to immediately change the state of the wall charges formed in the address period to perform rapid driving. To be able.

In addition, the absolute voltage of the first negative sustain pulse including the ramp pulse (Ramp) is characterized in that less than the absolute voltage of the other negative sustain pulse (-Vs), more preferably the ramp pulse (Ramp) The difference (h) between the absolute voltage of the first negative sustain pulse and the other negative voltage of the other negative sustain pulse (-Vs) is adjusted to 5V or more and 20V or less. This makes it possible to more easily control the sustain discharge occurring at the same potential and further reduce the influence on the phosphor by applying an absolute voltage smaller than the sustain pulse.

Such an effect according to the driving method of the plasma display panel of FIG. 8 is more clearly shown in FIGS. 9A and 9B for comparing the subsequent optical waveforms.

9A and 9B are diagrams for comparing optical waveforms according to the negative sustain driving waveform of the plasma display panel of the present invention.

As shown in FIGS. 9A and 9B, FIG. 9A is a view showing the degree of splashing of an optical waveform during sustain discharge which is generated according to a negative sustain driving waveform of a conventional plasma display panel, and FIG. 9B is a plasma display according to the present invention. The figure shows the degree of splashing of an optical waveform during sustain discharge which appears according to the negative sustain driving waveform of the panel.

9A, the sub discharge cells, that is, the R, G, and B discharge cells are coated with phosphors having different light emission characteristics. At this time, at the start of the sustain period, the first negative sustain pulse is applied vertically, which causes mis-discharge and over-discharge due to the sudden voltage change rate per hour, which causes the sustain discharge to become unstable, resulting in a large influence on the optical waveform. It can be seen that the difference between the peak values W1, W2, and W3 of the optical waveform generated for each of the other R, G, and B discharge cells is increased. When the difference in the optical waveform of each of the R, G, and B discharge cells is large, the phosphor having a large peak value of the optical waveform, for example, in FIG. 9A, green (G) emits more lightly so that the white balance is not proper to realize pure white. Becomes difficult.

9B, the sub discharge cells, that is, the R, G, and B discharge cells, are respectively coated with phosphors having different light emission characteristics, and a lamp is formed at the first negative sustain pulse at the start of the sustain period. That is, the rate of change in voltage per hour of the first negative sustain pulse is reduced to control mis-discharge and overdischarge, and as a result, the sustain discharge can be stably generated, thereby minimizing the influence on the optical waveform.

Accordingly, even though the sub-discharge cells have different light emission characteristics, the difference in the peak values W4, W5, and W6 of the optical waveform is relatively reduced by the stable sustain discharge, and the balance of the colors R, G, and B is improved. Pure white can be achieved.

 As such, the technical configuration of the present invention described above can be understood by those skilled in the art that the present invention can be implemented in other specific forms without changing the technical spirit or essential features of the present invention.

Therefore, the exemplary embodiments described above are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the appended claims rather than the foregoing detailed description, and the meaning and scope of the claims are as follows. And all changes or modifications derived from the equivalent concept should be interpreted as being included in the scope of the present invention.

As described above in detail, the present invention includes a lamp pulse in the first negative sustain pulse applied to the plasma display panel in the sustain period, thereby reducing the difference in the optical waveform of each of the sub-discharge cell phosphors emitting in the sustain period. It can stabilize the discharge.

In addition, the present invention includes a lamp pulse in the first negative sustain pulse applied to the plasma display panel in the sustain period, thereby reducing the difference in the optical waveform of each of the sub-discharge cell phosphors that emit light during the sustain period, and thus mis-discharge and over-discharge The white balance can be controlled to achieve pure white.

Claims (10)

A plasma display panel on which scan electrodes and sustain electrodes are formed; Respective driving units for driving a plasma display panel by applying a signal to the electrodes; And A pulse controller configured to control the driver so that the first sustain pulse applied to at least one of the scan electrode and the sustain electrode in the sustain period of the subfield is a ramp pulse and has an absolute voltage smaller than the remaining sustain pulses; Plasma display device comprising a. The method of claim 1, And the sustain period of the ramp pulse is 5 ms or less. The method of claim 1, And a first sustain pulse including a ramp pulse applied to the scan electrode and the sustain electrode is applied from the sustain electrode. The method of claim 1, And the sustain pulse is negative. The method of claim 1, And a difference between the absolute voltage of the first sustain pulse including the lamp pulses and the absolute voltage of the other sustain pulses is 5V or more and 20V or less. In a driving method of a plasma display panel in which a scan electrode and a sustain electrode are formed, The first sustain pulse applied to at least one of the scan electrode and the sustain electrode in the sustain period of the sub-field is a ramp pulse, the absolute voltage is smaller than the rest of the sustain pulse. The method of claim 6, And the sustain period of the ramp pulse is 5 ms or less. The method of claim 6, And a first sustain pulse including a ramp pulse applied to the scan electrode and the sustain electrode is applied from the sustain electrode. The method of claim 6, And the sustain pulse has a negative polarity. The method of claim 6, And a difference between the absolute voltage of the first sustain pulse including the lamp pulses and the absolute voltage of the other sustain pulses is 5V or more and 20V or less.

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