KR20100033069A - Plasma display apparatus and method for driving thereof - Google Patents

Abstract

PURPOSE: A plasma display apparatus and a driving method thereof are provided to improve image quality by stabilizing a sustain discharge generated in the sustain period of a selective erasing subfield. CONSTITUTION: A plasma display panel(100) comprises a scan electrode and a sustain electrode which are in a line each other. The plasma display panel implements an image including at least one selective erasing subfield and a selective writing subfield. A driving part(110) supplies a sustain signal in the sustain period of at least one selective writing subfield and a selective erasing subfield. The first sustain signal can be provided to the sustain electrode in the sustain period of the selective erasing subfield. The first sustain signal can be provided to the scan electrode in the sustain period of the selective erasing subfield. The voltage size of the first sustain signal of the selective erasing subfield can be greater than at least ones voltage size among the other sustain signal except for the first sustain signal.

Description

Plasma display device and driving method thereof

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

The plasma display apparatus includes a plasma display panel.

In the plasma display panel, a phosphor layer is formed in a discharge cell divided by a partition, and a plurality of electrodes are formed.

When the drive signal is supplied to the electrode of the plasma display panel, the discharge is generated by the drive signal supplied in the discharge cell. Here, when discharged by a drive signal in the discharge cell, the discharge gas filled in the discharge cell generates vacuum ultraviolet rays, and the vacuum ultraviolet light emits the phosphor formed in the discharge cell to emit visible light. Generate. The visible light displays an image on the screen of the plasma display panel.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display apparatus and a driving method thereof for stabilizing sustain discharge occurring in a sustain period of a selective erasing subfield.

A method of driving a plasma display device according to the present invention includes scan electrodes and sustain electrodes parallel to each other, and at least one selective write subfield disposed in front of at least one selective erasing subfield and one selective erasing subfield. A method of driving a plasma display apparatus for realizing an image with a frame including (Selective Writing Subfield), the method comprising: supplying a sustain signal in a sustain period of at least one selective writing subfield and at least one selective erasing subfield; The difference in voltage between the scan electrode and the sustain electrode in the sustain period of the erase subfield when the first sustain signal is supplied is determined by the scan electrode and the sustain in the period during which at least one of the other sustain signals except for the first sustain signal is supplied. It may comprise greater than the voltage difference between the scan electrode and the sustain electrode in a period where the first sustain signals supplied in the sustain period of the selective writing sub-field or a voltage difference between the electrodes.

In addition, the first sustain signal may be supplied to the sustain electrode in the sustain period of the selective erasure subfield.

In addition, the first sustain signal may be supplied to the scan electrode in the sustain period of the selective erasure subfield.

In addition, the magnitude of the voltage of the first sustain signal of the selective erasure subfield may be greater than the magnitude of at least one voltage of the other sustain signals except for the first sustain signal.

In addition, in the sustain period of the selective erasing subfield, a first signal having a polarity opposite to that of the sustain signal may be supplied to the other electrode in a period in which the first sustain signal is supplied to any one of the scan electrode and the sustain electrode.

Also, the lowest voltage of the first signal may be equal to the lowest voltage of the scan signal.

In addition, the magnitude of the voltage of the first signal may be smaller than the magnitude of the voltage of the sustain signal.

Further, in the period in which the first sustain signal is supplied, the selective write subfield and the selective erase subfield having different voltage differences between the scan electrode and the sustain electrode may be continuous with each other.

In addition, the voltage difference between the scan electrode and the sustain electrode in the initial sustain period including at least the first sustain signal of the sustain signal in the sustain period of the selective erasure subfield is between the scan electrode and the sustain electrode after the initial sustain period in the sustain period. The voltage difference or the voltage difference between the scan electrode and the sustain electrode in the initial sustain period in the sustain period of the selective write subfield may be greater.

In addition, the pulse width of the first sustain signal supplied in at least one sustain period of the selective erase subfield and the selective write subfield may be greater than at least one pulse width of the other sustain signals except for the first sustain signal.

In addition, the plasma display apparatus according to the present invention includes scan electrodes and sustain electrodes parallel to each other, and includes at least one selective writing subfield disposed in front of at least one selective erasing subfield and one selective erasing subfield. A plasma display panel for implementing an image with a frame including a selective writing subfield, and a sustain signal is supplied in a sustain period of at least one selective writing subfield and at least one selective erasing subfield, and in a sustain period of the selective erasing subfield. The voltage difference between the scan electrode and the sustain electrode in the period when the first sustain signal is supplied is the voltage difference or selective writing between the scan electrode and the sustain electrode in the period where at least one of the other sustain signals except the first sustain signal is supplied. The driving unit may include a driver that is larger than a voltage difference between the scan electrode and the sustain electrode in a period in which the first sustain signal is supplied in the sustain period of the subfield.

The plasma display device and the driving method thereof according to the present invention have an effect of improving the image quality of an image to be realized by stabilizing the sustain discharge occurring in the sustain period of the selective erasing subfield.

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

1 is a diagram for explaining a configuration of a plasma display device.

Referring to FIG. 1, the plasma display apparatus includes a plasma display panel 100 and a driver 110.

The plasma display panel 100 may include scan electrodes Y1 to Yn and sustain electrodes Z1 to Zn that are parallel to each other, and may include address electrodes X1 to Xm that cross the scan electrode and the sustain electrode. In addition, the plasma display panel 100 is a frame including at least one selective erasing subfield and at least one selective writing subfield disposed in front of the selective erasing subfield. You can implement the image.

The driver 110 may supply a driving signal to at least one of a scan electrode, a sustain electrode, and an address electrode of the plasma display panel 100 to implement an image on the screen of the plasma display panel 100.

Preferably, the driving unit 110 supplies a sustain signal in the sustain period of at least one selective write subfield and at least one selective erase subfield, and a period in which the first sustain signal is supplied in the sustain period of the selective erase subfield. The voltage difference between the scan electrode and the sustain electrode at is the voltage difference between the scan electrode and the sustain electrode in a period where at least one of the other sustain signals except the first sustain signal is supplied, or the first sustain signal in the sustain period of the selective write subfield. It can be made larger than the voltage difference between the scan electrode and the sustain electrode in the period that is supplied.

The operation of the driving unit 110 will be described in more detail below.

Here, in FIG. 1, only the case in which the driving unit 110 is formed in one board form is illustrated, but in the present invention, the driving unit 110 is divided into a plurality of board forms according to electrodes formed on the plasma display panel 100. It is also possible to lose. For example, the driver 110 may include a first driver (not shown) for driving the scan electrode of the plasma display panel 100, a second driver for driving the sustain electrode, and a third driver (not shown) for driving the address electrode. Can be divided into

2 is a diagram for explaining an example of the structure of the plasma display panel.

Referring to FIG. 2, the plasma display panel 100 includes a front substrate 201 in which scan electrodes 202 and Y and sustain electrodes 203 and Z are parallel to each other, and scan electrodes 202 and Y and a sustain electrode ( The back substrate 211 on which the address electrodes 213 and X intersect with 203 and Z may be formed.

The discharge currents of the scan electrodes 202 and Y and the sustain electrodes 203 and Z are limited on the scan electrodes 202 and Y and the sustain electrodes 203 and Z, and the scan electrodes 202 and Y and the sustain electrodes ( An upper dielectric layer 204 may be arranged to insulate between 203 and Z).

A protective layer 205 may be formed on top of the upper dielectric layer 204 to facilitate discharge conditions. The protective layer 205 may include a material having a high secondary electron emission coefficient, such as magnesium oxide (MgO) material.

Address electrodes 213 and X may be formed on the rear substrate 211, and a lower dielectric layer 215 may be formed on the address electrodes 213 and X to insulate the address electrodes 213 and X.

On top of the lower dielectric layer 215, a partition space 212, such as a stripe type, a well type, a delta type, a honeycomb type, etc., is formed on the discharge space, that is, to partition the discharge cells. Can be. Accordingly, the first discharge cell emitting red (R) light, the second discharge cell emitting blue (B) light, and the green (Green) light between the front substrate 201 and the rear substrate 211. : G) A third discharge cell or the like that emits light can be formed.

The discharge gas may be filled in the discharge cells partitioned by the partition wall 212. The discharge gas may include xenon (Xe), neon (Ne), and at least one of argon (Ar) and helium (He) may be further included.

In addition, a phosphor layer 214 that emits visible light for image display may be formed in the discharge cells partitioned by the partition wall 212. For example, a first phosphor layer that generates red light, a second phosphor layer that generates blue light, and a third phosphor layer that generates green light may be formed.

When a predetermined signal is supplied to at least one of the scan electrode 202, the sustain electrode 203, and the address electrode 213, a discharge may occur in the discharge cell. Ultraviolet rays may be generated by the discharge gas filled in the inside, and the ultraviolet rays may be irradiated to the phosphor particles of the phosphor layer 214. Then, the phosphor particles irradiated with ultraviolet rays emit visible light, thereby causing the plasma display panel 100 to emit light. A predetermined image may be displayed on the screen.

FIG. 3 is a diagram for describing a structure of a frame for implementing gradation of an image.

Referring to FIG. 3, a frame for implementing gray levels of an image may include a plurality of subfields SF1 to SF8.

In addition, the plurality of subfields may include a sustain period for implementing gradation according to an address period and a number of discharges for selecting discharge cells in which discharge cells will not occur or discharge cells in which discharge occurs. Period).

For example, in the case of displaying an image with 256 gray levels, for example, one frame is divided into eight subfields SF1 through SF8 as shown in FIG. 3, and each of the eight subfields SF1 through SF8 is represented by one frame. It may include an address period and a sustain period.

The gray scale weight of the corresponding subfield may be set by adjusting the number of the sustain signals supplied in the sustain period. That is, a predetermined gray scale weight can be given to each subfield using the sustain period. For example, the gray scale weight of each subfield is 2 ⁿ by setting the gray scale weight of the first subfield to 2 ⁰ and the gray scale weight of the second subfield to 2 ¹ (where n = 0, 1). , 2, 3, 4, 5, 6, and 7) to increase the gray scale weight of each subfield. As described above, gray levels of various images may be realized by adjusting the number of sustain signals supplied in the sustain period of each subfield according to the gray scale weight in each subfield.

In FIG. 3, only one image frame is composed of eight subfields. However, the number of subfields constituting one image frame may be variously changed. For example, one video frame may be configured with 12 subfields from the first subfield to the twelfth subfield, or one video frame may be configured with 10 subfields.

In addition, in FIG. 3, subfields are arranged in the order of increasing magnitude of gray scale weight in one image frame. Alternatively, subfields may be arranged in order of decreasing gray scale weight in one image frame. Alternatively, subfields may be arranged regardless of the gray scale weight.

At least one of the plurality of subfields included in the frame may be a selective erase subfield (SE), and at least one of the plurality of subfields may be a selective write subfield (SW). Do.

In the case where one frame includes at least one selective erase subfield and an optional write subfield, it is preferable that the first subfield of the plurality of subfields of the frame is an optional write subfield, and the rest are selective erase subfields. Can be.

Alternatively, all subfields included in the frame may be selective erasure subfields.

Here, the selective erasing subfield is a subfield that turns off the discharge cells supplied with the data signal Data to the address electrodes in the address period in the sustain period after the address period.

The selective write subfield is a subfield that turns on the discharge cells supplied with the data signal Data to the address electrodes in the address period in the sustain period after the address period.

In addition, the selective write subfield may include a reset period, an address period, and a sustain period for initializing discharge cells.

4A to 4C are views for schematically explaining a method of driving a plasma display device according to the present invention. 5 is a diagram for explaining the first signal in more detail. The signals to be described below are provided by the driver 110 in FIG. 1.

First, FIG. 4A illustrates an example in which one frame includes the selective write subfield SW and the selective erase subfield SE.

Referring to FIG. 4A, in the selective write subfield SW, the first pre-reset signal PRS1 having a voltage gradually falling may be supplied to the scan electrode Y in the pre-reset period PRS before the reset period RP. have.

In addition, in the pre-reset period, the second pre-reset signal PRS2 having a positive voltage may be supplied to the sustain electrode Z. The voltage of the second pre-reset signal PRS2 may be substantially equal to the maximum voltage of the sustain signal SUS supplied to at least one of the scan electrode and the sustain electrode in a subsequent sustain period, that is, the sustain voltage Vs.

In this pre-reset period, when the first pre-reset signal PRS1 is supplied to the scan electrode and the second pre-reset signal PRS overlapping the first pre-reset signal PPRS1 is supplied to the sustain electrode, within the discharge cell. Pre-set discharge occurs. Then, a wall charge may be formed in the discharge cell in a form that is sufficiently usable in a subsequent reset period.

Then, the reset discharge occurring in the subsequent reset period can be more stable. In addition, even when the voltage of the reset signal supplied to the scan electrode is reduced in the reset period, it is possible to sufficiently stabilize the reset discharge, thereby improving the contrast characteristic of the image to be implemented.

Meanwhile, in the reset period of the selective write subfield, the positive reset signal RS may be supplied to the scan electrode.

Here, the reset signal RS may include a rising ramp signal Ramp-Up (RU) for gradually increasing the voltage and a falling ramp signal Ramp-Down (RD) for gradually decreasing the voltage.

When the rising ramp signal is supplied to the scan electrode, a weak dark discharge, that is, a setup discharge may occur in the discharge cell by the rising ramp signal. By this setup discharge, some wall charges can be accumulated in the discharge cells.

Thereafter, a falling ramp signal having a polarity opposite to that of the rising ramp signal may be supplied to the scan electrode after the rising ramp signal. Then, a weak erase discharge, that is, a set down discharge may occur in the discharge cell. By this set-down discharge, wall charges such that address discharge can be stably generated can be uniformly retained in the discharge cells.

In the address period after the reset period, the second scan bias signal Ybias2 having a voltage higher than the lowest voltage of the falling ramp signal, that is, the second scan reference voltage Vsc2 may be supplied to the scan electrode.

In addition, the second scan signal Scan2 falling from the second scan reference voltage Vsc2 may be supplied to the scan electrode.

When the second scan signal is supplied to the scan electrode, the second data signal Data2 may be supplied to the address electrode X to correspond to the scan signal.

When the second scan signal and the second data signal are supplied, the voltage difference between the second scan signal and the second data signal and the wall voltage caused by the wall charges generated in the reset period are added to the discharge cell to which the data signal is supplied. An address discharge, i.e., a write address discharge, may be generated. Then, a sufficient amount of wall charges may be formed in the discharge cell to generate the sustain discharge when the sustain signal is supplied.

The second sustain bias signal Zbias2 having the second sustain reference voltage Vz2 may be supplied to the sustain electrode in order to prevent the address discharge from becoming unstable due to the interference of the sustain electrode Z in the address period.

Subsequently, in the sustain period for displaying an image, the sustain signal SUS may be supplied to at least one of the scan electrode and the sustain electrode. For example, a sustain signal may be alternately supplied to the scan electrode and the sustain electrode.

When such a sustain signal is supplied, the discharge cell selected by the address discharge is added with the wall voltage in the discharge cell and the sustain voltage Vs of the sustain signal, and a sustain discharge, i.e., display between the scan electrode and the sustain electrode when the sustain signal is supplied. Discharge may occur.

The reset period may be omitted in the selective erase subfield SE, which is contiguous with the selective write subfield SW and disposed later in time, ie, following the selective write subfield. Alternatively, when the reset period is provided in the selective erase subfield, the positive reset signal may not be supplied to the scan electrode in the reset period. That is, since the last sustain signal SUS _last of the sustain signals supplied in the sustain period of the selective write subfield is supplied, the first scan electrode is provided to the scan electrode in the address period of the selective erase subfield SE following the selective write subfield. In the period until the scan reference voltage Vsc1 is supplied, the positive signal is not supplied to the scan electrode.

As described above, when the reset period is omitted in the selective erasure subfield or when the positive reset signal is not supplied to the scan electrode in the reset period, unnecessary light generation can be reduced, thereby improving the contrast characteristic of the implemented image.

In addition, in the address period of the selective erase subfield, the first scan bias signal Ybias1 having the first scan reference voltage Vsc1 is supplied to the scan electrode, and the first scan signal Scan1 descending from the first scan reference voltage is provided. Can be supplied.

Also. The first data signal Data1 corresponding to the first scan signal may be supplied to the address electrode.

Then, in the address period of the selective erasing subfield, address discharge, that is, erasing address discharge, may occur due to a voltage difference between the first scan signal and the first data signal.

In addition, the first sustain bias signal Zbias1 having the first sustain reference voltage Vz1 may be supplied to the sustain electrode in order to prevent the address discharge from becoming unstable due to the interference of the sustain electrode Z in the address period.

On the other hand, when comparing the address periods of the selective write subfield and the selective erase subfield, since the discharge cells turned on in the sustain period must be selected in the address period of the selective write subfield, sufficient wall charges must be formed during address discharge. . Therefore, it may be desirable that the pulse width of the scan signal supplied to the scan electrode in the address period of the selective write subfield is sufficiently wide or the voltage is sufficiently large.

On the other hand, in the address period of the selective erasing subfield, since the discharge cells to be turned off in the sustain period must be selected, a sufficient amount of wall charges must be erased during address discharge. Therefore, it may be preferable that the pulse width of the scan signal supplied to the scan electrode in the address period of the selective erasing subfield is sufficiently small or the voltage is sufficiently small.

Therefore, as shown in FIG. 4B, the pulse width W2 of the first scan signal Scan1 may be smaller than the pulse width W1 of the second scan signal Scan2. Alternatively, as shown in FIG. 4C, the magnitude ΔV11 of the voltage of the first scan signal Scan1 may be smaller than the magnitude ΔV10 of the voltage of the second scan signal Scan2.

Alternatively, to generate an address discharge for erasing wall charge, that is, an erase address discharge, in the address period of the selective erase subfield, and to generate an address discharge, that is, write address discharge, that forms wall charge in the address period of the selective write subfield. It is also possible to make the second scan reference voltage Vsc2 lower than the first scan reference voltage Vsc1.

Alternatively, the data signal supplied to the address electrode in the address period of the selective erasing subfield is sufficiently smaller than the data signal supplied to the address electrode in the address period of the selective writing subfield, or the voltage is sufficiently small. It may also be possible.

Meanwhile, in order to prevent strong discharge from occurring between the scan electrode and the sustain electrode in the address period of the selective erasure subfield, and to erase the wall charge more uniformly, the voltage is lower than that of the second sustain bias signal Zbias2. The first sustain bias signal Zbias1 may be supplied.

The voltage Vzb2 of the second sustain bias signal Zbias2 may be higher than the ground level GND and lower than the voltage Vs of the sustain signal SUS supplied to at least one of the scan electrode and the sustain electrode in the sustain period. In addition, the voltage of the first sustain bias signal Zbias1 may be lower than the voltage Vzb2 of the second sustain bias signal Zbias2.

Subsequently, in the sustain period for displaying an image, the sustain signal SUS may be supplied to at least one of the scan electrode and the sustain electrode. For example, a sustain signal may be alternately supplied to the scan electrode and the sustain electrode.

When such a sustain signal is supplied, sustain discharge may be generated between the scan electrode and the sustain electrode in the discharge cell in which the erase address discharge has not occurred.

In addition, the voltage difference between the scan electrode and the sustain electrode in the sustain period of the selective erasure subfield [SE] during the period in which at least one of the other sustain signals except the first sustain signal is supplied in the sustain period of the first sustain signal is supplied. It may be desirable to be greater than the voltage difference between the scan electrode and the sustain electrode or the voltage difference between the scan electrode and the sustain electrode in the period in which the first sustain signal is supplied in the sustain period of the selective write subfield.

For example, in the sustain period of the selective write subfield, as in the case of FIG. 5A, while the first sustain signal SUS1 is supplied to the scan electrode, the sustain electrode has a voltage substantially at the ground level GND. As a result, the voltage difference between the scan electrode and the sustain electrode can be substantially Vs. On the other hand, in the sustain period of the selective erasing subfield, the first sustain signal SUS1 is supplied to the scan electrode while the first sustain signal SUS1 is supplied to the scan electrode as in the case of FIG. By supplying one signal S1, the voltage difference between the scan electrode and the sustain electrode can be approximately Vs + V1. That is, the voltage difference between the scan electrode and the sustain electrode in the period when the first sustain signal is supplied is larger in the selective erase subfield than in the selective write subfield.

As such, when the voltage difference between the scan electrode and the sustain electrode is relatively increased while the at least first sustain signal SUS1 is supplied in the sustain period of the selective erase subfield, the sustain discharge in the selective erase subfield may be stabilized. have.

This will be described in more detail as follows. Hereinafter, a case where the voltage difference between the scan electrode and the sustain electrode in the period when the first sustain signal is supplied is greater than the voltage difference between the scan electrode and the sustain electrode in the period when the other sustain signal is supplied.

In the selective write subfield, an image is realized by generating a sustain discharge in a sustain period in a discharge cell in which an address discharge, that is, a write address discharge occurs, in an address period.

On the other hand, in the selective erasing subfield, the image is realized by not generating the sustain discharge in the sustain period in the discharge cell in which the address discharge, that is, the erase address discharge, is generated in the address period.

As a result, a condition in which sustain discharge may occur in the sustain period of the selective erasure subfield is that sustain discharge should occur in the sustain period of the previous subfield, and address discharge, that is, erase address discharge, should not occur in the address period. .

The above condition may mean that in order for the sustain discharge to occur in the sustain period of the selective erasing subfield, a time equal to the length of the address period must pass after the sustain discharge occurs in the sustain period of the previous subfield.

Here, a dead zone is a period in which no discharge occurs in the discharge cell, that is, between the sustain period of the previous subfield and the sustain period of the current selective erasure subfield.

In these dead zones, the wall charges in the discharge cells are neutralized, resulting in a decrease in the amount of wall charges. As a result, the amount of wall charges is insufficient in the sustain period of the selective erasure subfield. Excessive weakening or even sustain discharge may not occur. In this case, the image quality of the image to be implemented may deteriorate.

On the other hand, as shown in FIG. 5 (b), while the first sustain signal SUS1 is supplied to the sustain electrode, the first signal S1 is supplied to the scan electrode to relatively reduce the voltage difference between the scan electrode and the sustain electrode. If large, the sustain discharge can be sufficiently strong and stable even if the wall charge in the discharge cell is lost in the dead zone. Accordingly, the image quality of the image to be implemented may be improved.

On the other hand, when the first signal S1 is also used in the sustain period of the selective write subfield, for example, in the case of FIG. 5A, for example, when the first sustain signal SUS1 is supplied to the scan electrode, the sustain electrode is used. If the first sustain signal SUS1 and the first signal S1 having a reverse polarity are supplied to the power supply, the self-erasing phenomenon may occur due to excessively strong first sustain discharge, and thus, a discharge cell. This is undesirable because the amount of wall charge in the interior may be insufficient.

In addition, it may be preferable that the selective write subfield and the selective erase subfield having different voltage differences between the scan electrode and the sustain electrode in a period where the first sustain signal is supplied are arranged consecutively to each other. In other words, the voltage difference between the scan electrode and the sustain electrode in the sustain period of the optional write subfield during the first sustain signal is supplied in the sustain period of the selective erase subfield disposed immediately after the selective write subfield. This is different from the voltage difference between the scan electrode and the sustain electrode during the period when the first sustain signal is supplied.

On the other hand, in the sustain period of the selective erasing subfield as shown in FIG. 4A, it is preferable that the first sustain signal is supplied to the sustain electrode, and conversely, in the sustain period of the selective writing subfield, the first sustain signal is preferably supplied to the scan electrode. Can be.

In the selective write subfield, the second scan reference voltage Vsc2 supplied to the scan electrode in the address period is lower than the voltage of the ground level GND.

Therefore, after the write address discharge occurs in the address period of the selective write subfield, the wall charges are arranged so that it is advantageous for the sustain discharge that the first sustain signal SUS1 having the positive polarity is supplied to the scan electrode. Accordingly, in the selective write subfield, it is preferable that the first sustain signal is supplied to the scan electrode.

In addition, it is easy to generate the first signal S1 using the conventional scan driving circuit as a signal having a reverse polarity with the first sustain signal SUS1, but it is practically impossible to generate the first signal S1 using the existing sustain driving circuit. In addition, a driving circuit for generating the first signal S1 must be further provided in the existing sustain driving circuit.

Accordingly, the first signal S1 may be more advantageously supplied to the scan electrode in view of the manufacturing cost of the driving circuit. For this purpose, the first signal S1 corresponds to the first signal S1 and overlaps the first signal S1. It may be desirable to supply the first sustain signal SUS1 to the sustain electrode.

6 is a diagram for explaining the voltage of the first signal.

Referring to FIG. 6, the lowest voltage V1 of the first signal S1 may be substantially the same as the scan signal, that is, the lowest voltage Vy of the first scan signal Scan1.

In such a case, since the first signal can be generated by using the driving circuit for generating the first scan signal, the addition of the driving circuit is not necessary, whereby further increase in manufacturing cost can be suppressed.

In addition, in order to stabilize the sustain discharge generated between the scan electrode and the sustain electrode, the voltage of the first signal S1 may be smaller than the voltage of the sustain signal.

7 and 8 are diagrams for explaining the relationship between the first signal and the first sustain signal in more detail.

Referring to FIGS. 7 and 8, the first signal S1 and the first sustain signal SUS1 overlap each other, and the sustain signal has a rising period (rp) and a maximum voltage (Vs) at which the voltage rises. It may include a sustain period (mp) that is maintained at and a falling period (fp) that the voltage falls,

In addition, the supply time t1 and the end time t2 of the first signal S1 do not overlap the rising period rp and the falling period fp of the first sustain signal SUS1.

As described above, when the supply time t1 and the end time t2 of the first signal S1 do not overlap the rising period rp and the falling period fp of the first sustain signal SUS1, It may not disturb the energy recovery process during the rising period (rp) and the falling period (fp), thereby preventing distortion of the waveform of the sustain signal during the rising period (rp) and the falling period (fp). have.

For example, as in the case of FIG. 7, the supply time t1 of the first signal S1 is earlier than the start time t3 of the rising period rp of the first sustain signal SUS1, and the first signal S1. ) May be later than the end time t6 of the falling period fp of the first sustain signal SUS1.

Alternatively, as in the case of FIG. 8, the supply time t1 of the first signal S1 is earlier than the start time t3 of the rising period rp of the first sustain signal SUS1 and the first signal S1 of the first signal S1. The end time t2 may be disposed between the start time t4 of the sustain period mp of the first sustain signal SUS1 and the end time t5 of the sustain period.

9A to 9B are views for explaining an example of another driving method of the plasma display device according to the present invention.

First, referring to FIG. 9A, between the scan electrode and the sustain electrode in the sustain period d1 including at least the first sustain signal of the sustain signal in the sustain period SP [SE] of the selective erasing subfield as shown in (a). The voltage difference may be greater than the voltage difference between the scan electrode and the sustain electrode after the initial sustain period d1 (d2) during the sustain period. Alternatively, the voltage difference between the scan electrode and the sustain electrode in the sustain period d1 including at least the first sustain signal among the sustain signals in the sustain period SP [SE] of the selective erasure subfield of (a) is (b). In the sustain period SP [SW] of the selective write subfield of S, it may be greater than the voltage difference between the scan electrode and the sustain electrode in the initial sustain period d1.

Here, the first sustain signal d1 includes the first sustain signal SUS1, and in addition, at least one sustain signal except the first sustain signal may be further included. In addition, the sustain signals included in the initial sustain period d1 are those whose supply order is relatively fast.

Even in this case, even when the wall charge in the discharge cell is lost in the dead zone, the sustain discharge can be sufficiently strong and stable. Accordingly, the image quality of the image to be implemented may be improved.

As described above, in order to relatively increase the voltage difference between the scan electrode and the sustain electrode in the initial sustain period d1 in the sustain period of the selective erasure subfield, the plurality of first overlapping with the sustain signal in the initial sustain period d1. Signal S1 can be supplied. That is, the number of first signals S1 is plural.

For example, when the first, second, third, fourth, and fifth sustain signals SUS1, SUS2, SUS3, SUS4, and SUS5 are sequentially supplied to the scan electrode or the sustain electrode as illustrated in FIG. 9B, the first sustain signal ( The first signal S1a corresponding to SUS1 is supplied to the scan electrode, the first signal S1b corresponding to the second sustain signal SUS2 is supplied to the sustain electrode, and corresponds to the third sustain signal SUS3. The first signal S1c may be supplied to the scan electrode.

As such, the number of first signals may vary.

10 is a diagram for explaining an example of a method of using a first signal in a selective erasure subfield. Hereinafter, the description of the contents described above in detail will be omitted.

Referring to FIG. 10, the voltage difference between the scan electrode and the sustain electrode in the sustain period of the selective erasing subfield when the first sustain signal SUS1 is supplied is different from other sustain signals, for example, the second, third, and fourth sustain signals SUS2. It may be preferable that the voltage difference between the scan electrode and the sustain electrode in the period of supplying, SUS2, SUS3) is greater than.

For example, when the first sustain signal SUS1 is supplied to the sustain electrode in the sustain period of the selective erasure subfield, the scan signal is supplied to the scan electrode by supplying a first signal S1 having a reverse polarity to the first sustain signal SUS1. The voltage difference between the electrode and the sustain electrode can be made relatively large.

This may be the case even when all subfields of one frame are selective erasure subfields, or may also be applicable when one frame includes at least one selective write subfield and at least one selective erase subfield.

As such, the voltage difference between the scan electrode and the sustain electrode in the sustain period of the selective erase subfield when the first sustain signal SUS1 is supplied, and the voltage difference between the scan electrode and the sustain electrode in the period when the other sustain signal is supplied. If it is made larger, even if the wall charge in the discharge cell is lost in the dead zone, it is possible to stabilize the sustain discharge in the sustain period of the selective erasure subfield.

11 and 12 are views for explaining an example of another driving method of the plasma display device according to the present invention. Hereinafter, the description of the contents described above in detail will be omitted. That is, in the above description, in order to relatively increase the voltage difference between the scan electrode and the sustain electrode in the period in which the first sustain signal is supplied, the first signal overlapping the first sustain signal when the first sustain signal is supplied to one electrode is described. Supplying to another electrode, in which the content of the first sustain signal is essentially increased by increasing the magnitude of the voltage between the scan electrode and the sustain electrode during the period when the first sustain signal is supplied. May be the same.

11 and 12, the voltage difference between the scan electrode and the sustain electrode in the sustain period of the selective erase subfield SE during the first sustain signal SUS1 is supplied is the sustain of the selective write subfield SW. It is larger than the voltage difference between the scan electrode and the sustain electrode in the period in which the first sustain signal is supplied in the period.

In addition, in order to relatively increase the voltage difference between the scan electrode and the sustain electrode in the period in which the first sustain signal SUS1 is supplied, the magnitude of the voltage of the first sustain signal SUS1 may be relatively large.

For example, in the sustain period of the selective write subfield, the first sustain signal SUS1 having a voltage of Vs is supplied to the scan electrode as in the case of FIG. 12A, while the sustain of the selective erase subfield is supplied. In the period, as in the case of Fig. 12B, the first sustain signal SUS1 having a voltage level of Vs' (Vs + ΔV) is supplied to the scan electrode to supply the scan electrode, so that the sustain period of the selective write subfield is first. In the period where the first sustain signal SUS1 is supplied, it is possible to relatively increase the voltage difference between the scan electrode and the sustain electrode.

13 is a view for explaining an example of another method of supplying a first sustain signal. Hereinafter, further descriptions of the details described above will be omitted. That is, in FIG. 13, except for the configuration in which the first sustain signal is supplied to the scan electrode or the first signal S1 is disposed on the sustain electrode, the first sustain signal is supplied to the sustain electrode or the first signal S1 is scanned electrode. It may be substantially the same as the configuration supplied to.

Referring to FIG. 13, if the sustain discharge is effectively generated between the scan electrode and the sustain electrode, the first sustain signal may be supplied to the scan electrode in the sustain period of the selective erase subfield.

In this case, it may be desirable to supply the first signal S1 to the sustain electrode in order to relatively increase the voltage difference between the scan electrode and the sustain electrode in the period when the first sustain signal is supplied.

As such, when the first sustain signal is supplied to the scan electrode in the sustain period of the selective erasing subfield, and the voltage difference between the scan electrode and the sustain electrode in the period during which the first sustain signal is supplied becomes relatively large, Even when the wall charge in the discharge cell is lost, the sustain discharge can be generated sufficiently strong and stably. Accordingly, the image quality of the image to be implemented may be improved.

It is a figure for demonstrating the pulse width of a sustain signal.

Referring to FIG. 14, the pulse width of the first sustain signal supplied in at least one sustain period of the selective erase subfield and the selective write subfield may be greater than at least one pulse width of the other sustain signals except for the first sustain signal. .

For example, as shown in Fig. 14A, the pulse width W10 of the first sustain signal SUS1 supplied in the sustain period of the selective write subfield [SW] is the third and subsequent sustain signals SUS3 and SUS4. It may be wider than the pulse width (W30, W40 ......) of .....).

In addition, the pulse width W20 of the second sustain signal SUS2 is also wider than the pulse widths W30, W40 ...... of the third and subsequent sustain signals SUS3, SUS4... It is possible.

In this case, the first sustain discharge occurring in the sustain period of the selective write subfield can be stabilized, and the amount of wall charges formed in the discharge cell can also be increased, thereby making it possible to stabilize the entire sustain discharge.

Here, the pulse width W10 of the first sustain signal SUS1 may be wider or substantially the same as the pulse width W20 of the second sustain signal SUS2.

In addition, as shown in Fig. 14B, the pulse width W11 of the first sustain signal SUS1 supplied in the sustain period of the selective erasing subfield [SW] is the third and subsequent sustain signals SUS3, SUS4 ... ... may be wider than the pulse width (W31, W41 ...).

In addition, the pulse width W21 of the second sustain signal SUS2 is also wider than the pulse widths W30, W40 ...... of the third and subsequent sustain signals SUS3, SUS4... It is possible.

In this case, the first sustain discharge occurring in the sustain period of the selective erasing subfield can be further stabilized.

Here, the pulse width W11 of the first sustain signal SUS1 may be wider or substantially the same as the pulse width W21 of the second sustain signal SUS2.

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.

1 is a diagram for explaining the configuration of a plasma display device;

2 is a diagram for explaining an example of the structure of a plasma display panel.

FIG. 3 is a diagram for explaining a structure of a frame for implementing gradation of an image. FIG.

4A to 4C are schematic views for explaining a method of driving a plasma display device according to the present invention;

5 is a diagram for explaining the first signal in more detail.

6 is a diagram for explaining the voltage of the first signal;

7 and 8 are diagrams for explaining the relationship between the first signal and the first sustain signal in more detail.

9A to 9B are views for explaining an example of another driving method of the plasma display device according to the present invention;

10 is a view for explaining an example of a method of using a first signal in a selective erasure subfield;

11 and 12 are views for explaining another example of the driving method of the plasma display device according to the present invention.

FIG. 13 is a view for explaining an example of another method of supplying a first sustain signal. FIG.

14 is a diagram for explaining a pulse width of a sustain signal.

Claims (11)

A frame including scan electrodes and sustain electrodes parallel to each other, and including at least one selective erasing subfield and at least one selective writing subfield disposed in front of the selective erasing subfield; In the driving method of a plasma display device for implementing an image, Supplying a sustain signal in a sustain period of at least one of the selective write subfields and at least one of the selective erase subfields; And In the sustain period of the selective erasure subfield, the voltage difference between the scan electrode and the sustain electrode in the period during which the first sustain signal is supplied is determined in the period during which at least one of the other sustain signals except for the first sustain signal is supplied. Increasing the voltage difference between the scan electrode and the sustain electrode or the voltage difference between the scan electrode and the sustain electrode during a period in which the first sustain signal is supplied in the sustain period of the selective write subfield; Method of driving a plasma display device comprising a. The method of claim 1, And the first sustain signal is supplied to the sustain electrode in the sustain period of the selective erasure subfield. The method of claim 1, And a first sustain signal supplied to the scan electrode in the sustain period of the selective erasure subfield. The method according to claim 2 or 3, And the magnitude of the voltage of the first sustain signal in the selective erasure subfield is greater than the magnitude of at least one of the other sustain signals except for the first sustain signal. The method according to claim 2 or 3, A plasma display in which a first signal having a polarity opposite to that of the sustain signal is supplied to the other electrode in a period in which the first sustain signal is supplied to any one of the scan electrode and the sustain electrode in the sustain period of the selective erasure subfield; Method of driving the device. The method of claim 5, And the lowest voltage of the first signal is equal to the lowest voltage of the scan signal. The method of claim 5, And the magnitude of the voltage of the first signal is smaller than the magnitude of the voltage of the sustain signal. The method of claim 1, And the selective write subfield and the selective erase subfield having different voltage differences between the scan electrode and the sustain electrode in a period in which the first sustain signal is supplied. The method of claim 1, The voltage difference between the scan electrode and the sustain electrode in the initial sustain period including at least the first sustain signal of the sustain signal in the sustain period of the selective erasure subfield is determined after the initial sustain period in the sustain period. And a voltage difference between the scan electrode and the sustain electrode or a voltage difference between the scan electrode and the sustain electrode in the initial sustain period in the sustain period of the selective write subfield. The method of claim 1, The pulse width of the first sustain signal supplied in at least one sustain period of the selective erase subfield and the selective write subfield is greater than at least one pulse width of the other sustain signals except for the first sustain signal. Driving method. A frame including scan electrodes and sustain electrodes parallel to each other, and including at least one selective erasing subfield and at least one selective writing subfield disposed in front of the selective erasing subfield; A plasma display panel for implementing an image; And The scan electrode in a period in which a sustain signal is supplied in a sustain period of at least one of the selective write subfields and at least one of the selective erase subfields, and the first sustain signal is supplied in a sustain period of the selective erase subfields. And the voltage difference between the sustain electrode and the sustain electrode of the selective write subfield or the voltage difference between the scan electrode and the sustain electrode during a period in which at least one of the other sustain signals except for the first sustain signal is supplied. A driver which makes the voltage difference greater than the voltage difference between the scan electrode and the sustain electrode during a sustain signal supply period; Plasma display device comprising a.

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