KR20110037301A - Plasma display apparatus and driving method thereof - Google Patents

Abstract

PURPOSE: A plasma display device and a driving method supplying a different sustain signal to a scan electrode are provided to reduce noise and electromagnetic interference by making the permission time of the sustain signals different. CONSTITUTION: A plasma display panel comprises a plurality of scan electrodes, a plurality of sustain electrodes and a plurality of address electrodes. The driving part supplies different sustain signals to a plurality of scan electrodes in different points of time. A scan drive integrated circuit(1300) comprises the switch and underlying switch. An energy recovery circuit(1310) collects the voltage of the scan electrode and supplies the voltage collected to the scan electrode. A scan reference voltage supply part(1320) supplies the scan standard voltage to the scan electrode.

Description

Plasma display device and driving method thereof {Plasma Display Apparatus and Driving Method}

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

The plasma display apparatus includes a plasma display panel.

The plasma display panel includes a phosphor layer formed in a discharge cell divided by a partition wall, and also includes a plurality of electrodes.

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.

SUMMARY OF THE INVENTION An object of the present invention is to provide a plasma display device and a driving method thereof for differently adjusting the application time of the sustain signals.

The plasma display apparatus according to the present invention includes a plurality of scan electrodes, a plurality of sustain electrodes, a plurality of sub-fields of a frame and a plasma display panel including a plurality of address electrodes crossing the scan electrodes and the sustain electrodes. The driving unit may be configured to supply a sustain signal having a different pulse width to at least two scan electrodes of the plurality of scan electrodes in a sustain period of at least one subfield.

In addition, the driving method of the plasma display apparatus according to the present invention includes a plurality of scan electrodes, a plurality of sustain electrodes, and a plurality of address electrodes crossing the scan electrodes and the sustain electrodes. And supplying a first sustain signal to a first scan electrode of the plurality of scan electrodes at a first time point in a sustain period of at least one subfield of a plurality of sub-fields of the frame, and the plurality of scans. And supplying a second sustain signal corresponding to the first sustain signal to a second scan electrode of the electrodes at a second time point later in time than the first time point, the second sustain signal having a pulse width smaller than that of the first sustain signal. have.

In addition, an end point of the first sustain signal and the second sustain signal may be substantially the same.

In addition, the first sustain signal is a first period of rising at a first rate of change from a first voltage to a second voltage, a second period of rising at a second rate of change smaller than the first rate of change from the second voltage to a third voltage. And a third period of maintaining the third voltage and a fourth period of falling from the third voltage to the first voltage, wherein the second sustain signal is greater than the second rate of change in the second period of time; It can have a rate of change.

In addition, the second sustain signal may have a voltage of the ground level GND in the first period.

In addition, the second sustain signal may rise from the first voltage to a fourth voltage smaller than the second voltage in the first period.

In addition, the second scan electrode may be floating in the first period.

In addition, the first sustain signal and the second sustain signal during the second period may include a period in which the voltage decreases and then rises again.

In addition, the supply order of the first sustain signal and the supply order of the second sustain signal may be the same.

In addition, another driving method of the plasma display apparatus according to the present invention includes a plurality of scan electrodes, a plurality of sustain electrodes, and a plurality of address electrodes crossing the scan electrodes and the sustain electrodes. And supplying a first sustain signal to an odd-numbered scan electrode of the plurality of scan electrodes at a first time point in a sustain period of at least one subfield of the plurality of sub-fields of the frame, and the plurality of sub-fields. The method may include supplying a second sustain signal corresponding to the first sustain signal and having a different pulse width from the first sustain signal to an even-numbered scan electrode at a second time point different from the first time point.

In addition, the supply time of the smaller pulse width among the first sustain signal and the second sustain signal may be later in time than the other supply time.

In addition, another method of driving a plasma display apparatus according to the present invention includes a plurality of scan electrodes, a plurality of sustain electrodes, a plurality of address electrodes intersecting the scan electrodes and the sustain electrodes. And supplying a first sustain signal to a first scan electrode of the plurality of scan electrodes in a sustain period of at least one subfield of the plurality of sub-fields of the frame, and supplying the first sustain signal to the first scan electrode. And floating a second scan electrode of the plurality of scan electrodes in a part of the period in which the first sustain signal is supplied.

In addition, another plasma display apparatus according to the present invention includes a plurality of scan electrodes, a plurality of sustain electrodes, a plurality of sub electrodes of a frame and a plasma display panel including a plurality of address electrodes crossing the scan electrodes and the sustain electrodes. And a driver for supplying sustain signals having different pulse widths at different points in time to the at least two scan electrodes of the plurality of scan electrodes in the sustain period of at least one subfield of the sub-field. A scan drive integrated circuit including an upper switch and a lower switch, and an energy recovery circuit for recovering a voltage of the scan electrode and supplying the recovered voltage to the scan electrode; The node between the other end of the upper switch and one end of the lower switch is Is coupled with the can electrode and the other end of the lower switch is connected to a negative scan voltage source for supplying the negative scan voltage, An output terminal of the energy recovery circuit may be connected with one end of the upper switch.

In addition, an inner diode of the upper switch may be disposed in a direction in which an anode faces the lower switch, and a cathode may be disposed in a direction toward the energy recovery circuit.

The driving unit may include a first scan drive integrated circuit configured to supply a first sustain signal to a first scan electrode of the plurality of scan electrodes in the sustain period at a first time point, and to a second scan electrode of the plurality of scan electrodes. And a second scan integrated circuit configured to supply a second sustain signal corresponding to a first sustain signal and having a smaller pulse width than the first sustain signal at a second time point later in time than the first time point; The length of the turn-on period of the upper switch of the drive integrated circuit may be longer than the length of the turn-on period of the upper switch of the second scan drive integrated circuit.

Further, both the upper switch and the lower switch of the second scan drive integrated circuit may be turned off during a part of the period during which the upper switch of the first scan drive integrated circuit is turned on. Can be.

In addition, another method of driving a plasma display apparatus according to the present invention includes a plurality of scan electrodes, a plurality of sustain electrodes, a plurality of address electrodes intersecting the scan electrodes and the sustain electrodes. And supplying a first sustain signal to a first scan electrode of the plurality of scan electrodes at a first time point in a sustain period of at least one subfield of the plurality of sub-fields of the frame. And supplying a second sustain signal corresponding to the first sustain signal to a second scan electrode of the scan electrodes at a second time point later in time than the first time point, the second sustain signal having a smaller pulse width than the first sustain signal. The first sustain signal and the second sustain signal have a voltage equal to the ground level GND. And a rising period in which the voltage rises up to the maximum voltage, a sustain period in which the maximum voltage is maintained, and a falling period in which the voltage falls from the maximum voltage to the voltage of the ground level GND, wherein the length of the rising period of the first sustain signal is The length of the sustain period of the first sustain signal and the second sustain signal may be equal to each other than a length of the rising period of the second sustain signal.

Further, the length of the falling period of the first sustain signal and the falling period of the second sustain signal may be substantially the same.

In addition, another plasma display apparatus according to the present invention includes a plurality of sub electrodes of a plasma display panel frame including a plurality of scan electrodes, a plurality of sustain electrodes, a plurality of address electrodes intersecting the scan electrodes and the sustain electrodes. A scan driver for supplying a sustain signal having a different pulse width to at least two scan electrodes of the plurality of scan electrodes in a sustain period of at least one subfield of a sub-field at different points of time and the sustain driver in the sustain period The sustain driver may be configured to supply sustain signals having different pulse widths to at least two sustain electrodes of the plurality of sustain electrodes at different time points.

The plasma display device and its driving method according to the present invention have an effect of reducing noise and electromagnetic interference (EMI) by changing the application time of the sustain signals.

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 may include a plasma display panel 100 and a driver 110.

The plasma display panel 100 may include a first electrode and a second electrode crossing the first electrode. In addition, the plasma display panel 100 may implement an image in a frame including a plurality of subfields. Here, the scan electrode and the sustain electrode may be referred to as a first electrode, and the sustain electrode may be referred to as a second electrode.

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 driver 110 has a pulse width at least two scan electrodes or sustain electrodes of the plurality of scan electrodes in the sustain period of at least one subfield of the plurality of sub-fields of the frame. Different sustain signals can be supplied at different points in time.

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 the structure of a plasma display panel.

Referring to FIG. 2, the plasma display panel 100 includes a rear substrate 211 on which a plurality of second electrodes 213 and X intersect the plurality of first electrodes 202 (Y) and 203 (Z). It may include.

Here, the first electrodes 202 and 203 may include scan electrodes 202 and Y and sustain electrodes 203 and Z parallel to each other, and the second electrode 211 may be referred to as an address electrode.

On the front substrate 201 where the scan electrodes 202 and Y and the sustain electrodes 203 and Z are formed, the discharge currents of the scan electrodes 202 and Y and the sustain electrodes 203 and Z are limited and the scan electrodes 202 and Y are restricted. ) And an upper dielectric layer 204 may be arranged to insulate between the sustain electrodes 203 and Z.

A protective layer 205 may be formed on the front substrate 201 where the upper dielectric layer 204 is formed 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.

The address electrodes 213 and X are formed on the rear substrate 211, and the address electrodes 213 and X are covered on the upper side of the rear substrate 211 on which the address electrodes 213 and X are formed. A lower dielectric layer 215 may be formed that insulates 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 partition 212 may include a first partition 212b and a second partition 212a, and a height of the first partition 212b and a height of the second partition 212a may be different from each other.

In the discharge cell, the address electrode 213 may cross the scan electrode 202 and the sustain electrode 203. That is, the discharge cell is formed at the point where the address electrode 213 crosses the scan electrode 202 and the sustain electrode 203.

A predetermined discharge gas may be filled in the discharge cell partitioned by the partition wall 212.

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.

In addition, the address electrode 213 formed on the rear substrate 211 may have substantially the same width or thickness, but the width or thickness inside the discharge cell may be different from the width or thickness outside the discharge cell. . For example, the width or thickness inside the discharge cell may be wider or thicker than that outside the discharge cell.

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

FIG. 3 is a diagram for describing an image 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) may be included.

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

Alternatively, at least one subfield of the plurality of subfields of the frame may further include a reset period for initialization.

In addition, at least one subfield of the plurality of subfields of the frame may not include a sustain period.

Meanwhile, the weight of the corresponding subfield may be set by adjusting the number of sustain signals supplied in the sustain period. That is, a predetermined weight can be given to each subfield using the sustain period. For example, the weight of each subfield is 2 ⁿ by setting the weight of the first subfield to 2 ⁰ and the weight of the second subfield to 2 ¹ (where n = 0, 1, 2, 3, 4, 5, 6, 7) can be set to increase the ratio. 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 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 an order of increasing weight in one image frame. Alternatively, subfields may be arranged in an order of decreasing weight in one image frame. Subfields may be arranged regardless.

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.

If one frame includes at least one selective erase subfield and an optional write subfield, the first subfield or the first and second subfields of the plurality of subfields of the frame are the selective write subfields, It may be desirable for the remainder to 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 erasure subfield may include an address period for selecting a discharge cell to be turned off and a sustain period for generating sustain discharge in discharge cells not selected in 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.

The selective write subfield may include a reset period for initializing the discharge cells, an address period for selecting the discharge cells to be turned on, and a sustain period for generating sustain discharge in the discharge cells selected in the address period.

4 is a diagram schematically illustrating a method of driving a plasma display device. The driving waveform to be described below is supplied by the driving unit 110 of FIG. 1.

Referring to FIG. 4, in the reset period RP for initializing at least one subfield among a plurality of subfields of a frame, the reset signal RS is applied to the scan electrode Y. Can supply Here, the reset signal RS may include a rising ramp signal (Ramp-Up: RU) in which the voltage gradually rises and a falling ramp signal (Ramp-Down: RD) in which the voltage gradually falls.

For example, the rising ramp signal RU may be supplied to the scan electrode in the setup period SU of the reset period, and the falling ramp signal RD may be supplied to the scan electrode in the setdown period SD after the setup period. .

When the rising ramp signal is supplied to the scan electrode, a weak dark discharge, that is, setup discharge, occurs in the discharge cell by the rising ramp signal. By this setup discharge, the distribution of wall charges can be uniform in the discharge cells.

After the rising ramp signal is supplied, when the falling ramp signal is supplied to the scan electrode, a weak erase discharge, that is, a setdown discharge, occurs 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 AP after the reset period, the scan reference signal Ybias having a voltage higher than the lowest voltage of the falling ramp signal may be supplied to the scan electrode.

In addition, in the address period, the scan signal Sc that falls from the voltage of the scan reference signal Ybias may be supplied to the scan electrode.

Meanwhile, the pulse width of the scan signal supplied to the scan electrode in the address period of at least one subfield may be different from the pulse width of the scan signal of another subfield. For example, the width of the scan signal in the subfield located later in time may be smaller than the width of the scan signal in the preceding subfield. In addition, the reduction of the scan signal width according to the arrangement order of the subfields can be made gradually, such as 2.6 Hz (microseconds), 2.3 Hz, 2.1 Hz, 1.9 Hz, or 2.6 Hz, 2.3 Hz, 2.3 Hz, 2.1 Hz. .... 1.9 ㎲, 1.9 ㎲ and so on.

As such, when the scan signal is supplied to the scan electrode, the data signal Dt may be supplied to the address electrode X corresponding to the scan signal.

When the scan signal and the data signal are supplied, an address discharge may be generated in the discharge cell to which the data signal is supplied while the voltage difference between the scan signal and the data signal and the wall voltage generated by the wall charges generated in the reset period are added. .

In addition, the sustain reference signal Zbias signal may be supplied to the sustain electrode in the address period in which the address discharge occurs so that the address discharge is effectively generated between the scan electrode and the address electrode.

In the sustain period SP after the address period, 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.

5 to 9 are diagrams for explaining the sustain signal.

Referring to FIG. 5, a sustain signal having a different pulse width is supplied to at least two scan electrodes of a plurality of scan electrodes in a sustain period of at least one subfield of a plurality of sub-fields of a frame at different time points. Can be.

For example, as shown in FIG. 5, the first sustain signal SUS1 is supplied to an arbitrary first scan electrode Y1 of the plurality of scan electrodes at a first time point t0, and an arbitrary second of the plurality of scan electrodes is provided. The second sustain signal SUS1 may be supplied to the scan electrode Y2 at the second time point t1 having a time difference from the first time point t0 by Δt. Here, the pulse width W2 of the second sustain signal SUS2 may be smaller than the pulse width W1 of the first sustain signal SUS1. That is, one application time with a smaller pulse width among two arbitrary sustain signals is later in time than the other application time.

In this case, the first sustain signal and the second sustain signal may have substantially the same supply order. In other words, when comparing the sustain signal supplied to the first scan electrode and the sustain signal supplied to the second scan electrode, two sustain signals having the same supply order are compared.

As described above, different application times of two sustain signals may reduce noise and electromagnetic interference (EMI).

In addition, when one application point having a smaller pulse width is delayed in time than the other application time in any two sustain signals, electromagnetic interference may be further reduced, and a simple change of the driving circuit may be implemented. In addition, an end point of the first sustain signal SUS1 and the second sustain signal SUS2 may be substantially the same. In this case, the control of the driving circuit may be easy, and it may be possible to implement a simple change of the driving circuit. This will be described in more detail below.

Here, the first scan electrode and the second scan electrode are not limited to the first scan electrode and the second scan electrode of the plurality of scan electrodes. For example, the first scan electrode may be a tenth scan electrode of the plurality of scan electrodes, and the second scan electrode may be a 20th scan electrode of the plurality of scan electrodes. As such, the first and second meanings in the present invention may not be limited to the order.

6 illustrates a case where the sustain signal SUS is supplied to the first scan electrode Y1 and the second scan electrode Y2 at substantially the same time point as in the present invention.

In the case of FIG. 6, an excessively large peaking voltage may occur due to a coupling effect when a sustain signal is supplied to the first and second scan electrodes. Accordingly, occurrence of noise and electromagnetic interference may increase.

On the other hand, when the first sustain signal and the second sustain signal are supplied to the first scan electrode and the second scan electrode at different times as shown in FIG. 5, the coupling effect is weakened when the first and second sustain signals are supplied. By doing so, noise and electromagnetic interference can be reduced.

Alternatively, as shown in FIG. 7, sustain signals having different pulse widths may be supplied to at least two sustain electrodes of the plurality of sustain electrodes at different time points in the sustain period of at least one subfield of the plurality of subfields of the frame.

Alternatively, as shown in FIG. 8, a sustain signal having a different pulse width is supplied to at least two scan electrodes of the plurality of scan electrodes in a sustain period of at least one of the plurality of subfields of the frame at different time points, It is possible to supply sustain signals with different pulse widths to at least two of the sustain electrodes at different points in time.

7 to 8 may be inferred from the configuration of FIG. 5, and thus, further description thereof will be omitted.

Hereinafter, for the convenience of explanation, the sustain signal supplied to the scan electrode will be described with reference to the present invention. Of course, it is possible that the configuration described below is applied to the sustain electrode or to the scan electrode and the sustain electrode together.

Referring to FIG. 9, a first sustain signal is supplied to odd-numbered scan electrodes Y1, Y3, Y5... Of the plurality of scan electrodes, and even-numbered scan electrodes Y2, Y4, among the plurality of scan electrodes. Y6...) May supply the second sustain signal having a smaller pulse width than the first sustain signal at a later time than when the first sustain signal is applied.

As such, when the application time of the sustain signal supplied to the odd-numbered scan electrode and the sustain signal supplied to the even-numbered scan electrode is different from each other, the effect of supplying the sustain signal at different points in time to the two adjacent scan electrodes can be obtained. This can further weaken the coupling effect when the sustain signal is supplied. As a result, noise and electromagnetic interference can be further reduced.

In FIG. 9, only the case where the first sustain signal having a large pulse width is supplied to the odd scan electrode and the second sustain signal having a small pulse width is supplied to the even scan electrode is described. On the contrary, the pulse width is applied to the odd scan electrode. It may also be possible if this small second sustain signal is supplied and the first sustain signal with a large pulse width is supplied to the even-numbered scan electrode.

10 to 12 are views for explaining the form of the sustain signal in more detail.

Referring to FIG. 10, the first sustain signal SUS1 having a time point at which the application time is faster than the second sustain signal SUS2 gradually increases from the first voltage V1 to the second voltage V2 at a first rate of change. A first period d1, a second period d2 that gradually rises at a second rate of change smaller than the first rate of change from the second voltage V2 to the third voltage V3, and a third voltage V3 that holds the third voltage V3; A third period d3 and a fourth period d4 gradually falling from the third voltage V3 to the first voltage V1 may be included. Here, the first voltage V1 may be a voltage of the ground level GND, and the third voltage V3 may be the maximum voltage of the first sustain signal, that is, the sustain voltage Vs.

As such, the first sustain signal may have a high voltage during the first period d1 and a second period d2, a voltage may be maintained during the third period d3, and a voltage may fall during the fourth period d4. have. In consideration of this, the first sustain signal may be interpreted as including a first rising period (rp1) at which the voltage rises, a first holding period (mp1) at which the voltage is maintained, and a first falling period (fp1) at which the voltage is falling. Can be. Here, the first rising period rp1 of the first sustain signal includes the first period d1 and the second period d2.

In addition, the second sustain signal SUS2 maintains the first voltage V1 during the first period d1, and has a third rate of change greater than the second rate of change of the first sustain signal in the second period d2. It may be desirable. For example, the second sustain signal may gradually increase from the first voltage V1 to the third voltage V3 in the second period d2. In addition, the second sustain signal may maintain the third voltage V3 in the third period d3, and may fall from the third voltage V3 to the first voltage V1 in the fourth period d4. .

As such, the second sustain signal may increase in voltage during the second period d2, maintain voltage during the third period d3, and decrease voltage during the fourth period d4. In view of this, the second sustain signal may be interpreted as including a second rising period (rp2) at which the voltage rises, a second holding period (mp2) at which the voltage is maintained, and a second falling period (fp2) at which the voltage is falling. Can be. Here, the second rising period rp2 of the second sustain signal includes the second period d2.

As described above, the length of the first rising period rp1 of the first sustain signal may be longer than the length of the second rising period rp2 of the second sustain signal. In other words, the rate of change of the voltage in the rising period of the second sustain signal having a slower application time and a smaller pulse width than the first sustain signal of any of the first and second sustain signals having different pulse widths is different. The magnitude is larger than the magnitude of the voltage change rate in the rising period of the first sustain signal.

In addition, the length of the first sustain period mp1 of the first sustain signal is substantially the same as the length of the second sustain period mp2 of the second sustain signal, and is equal to the length of the first falling period fp1 of the first sustain signal. The length may be substantially equal to the length of the second falling period fp2 of the second sustain signal.

Alternatively, as shown in FIG. 11, the second sustain signal SUS2 may gradually increase from the first voltage V1 to the fourth voltage V4 smaller than the second voltage V2 in the first period d1. have.

In the case of FIG. 11, the driving circuit generates the fourth voltage V4 and supplies the generated fourth voltage V4 to the second scan electrode Y2. The case of electrically floating the second scan electrode during d1) may also be applied. In detail, when the second scan electrode is electrically floated during the first period d1, the voltage is induced to the second scan electrode Y2 by the voltage supplied to the first scan electrode Y1, and thus the second scan electrode ( The voltage of Y2) may gradually increase from the first voltage V1 to the fourth voltage V4. In other words, the second scan electrode Y2 is floated in a part of the period during which the first sustain signal SUS1 is supplied to the first scan electrode Y1 (that is, the first period d1). .

As such, when the period in which the second scan electrode is floated is interpreted separately from the second sustain signal, the length of the second rising period rp2 of the second sustain signal is equal to the first rising period rp1 of the first sustain signal. Will be shorter than the length.

On the other hand, although not shown, in the case where the period in which the second scan electrode is floated is interpreted as being included in the second sustain signal, the length of the second rising period rp2 of the second sustain signal is the first rising of the first sustain signal. It may be substantially the same as the length of the period (rp1). In this case, the magnitude of the voltage change rate in the second rising period rp2 of the second sustain signal may be substantially the same as the magnitude of the voltage change rate in the first rising period rp1 of the first sustain signal.

Referring to FIG. 12, it may include a period in which the voltage decreases and then rises again during the second period d2 of the first and second sustain signals. For example, the first and second sustain signals drop to the fifth voltage V5 while rising from the second voltage V2 to the third voltage V3 in the second period d2, and then again to the third voltage V3. Can rise. In this case, the intensity of the discharge can be further strengthened and the efficiency can be improved.

13 to 21 are views for explaining the configuration and operation of the driver for supplying the sustain signal. The driving unit according to the present invention is not limited to the following energy recovery circuit. For example, although only one example of a weber type energy recovery circuit is shown below, the configuration of the energy recovery circuit can be variously changed, such as using a Sakai type energy recovery circuit.

Referring to FIG. 13, a driving unit according to the present invention recovers a voltage of a scan drive integrated circuit (Scan IC) 1300 and a scan electrode and supplies an recovered voltage to the scan electrode. , 1310). In addition, the driver may include a scan reference voltage supply 1320 for supplying a scan reference voltage to the scan electrode.

The scan reference voltage supply unit 1320 has directions of the internal diodes D3 and D4 opposite to each other to prevent current from flowing from the sustain voltage source supplying the sustain voltage Vs to the scan reference voltage source supplying the scan reference voltage Vsc. It may include the fifth switch S5 and the sixth switch S6 which are opposite.

When the driving unit having the configuration as shown in FIG. 13 is applied to supply the sustain signal to the sustain electrode, the scan reference voltage supply unit 1320 may be omitted.

The scan drive integrated circuit 1300 includes an upper switch and a lower switch Sbot disposed in series between the fourth node n4 and a negative scan voltage source supplying the negative scan voltage (-Vy). can do.

The scan drive integrated circuit 1300 may receive a voltage supplied from the scan reference voltage supply unit 1320 and the energy recovery circuit 1310 and supply the scan electrode to the scan electrode.

In addition, the node between the other end of the upper switch (Stop) and one end of the lower switch (Sbot) of the scan drive integrated circuit 1300 is connected to the scan electrode, the other end of the lower switch (Sbot) is connected to the scan reference voltage source, The output terminal of the recovery circuit 1310 may be connected to one end of the upper switch. That is, the positive voltage input to the scan drive integrated circuit 1300 is supplied to one end of the upper switch.

In addition, an internal diode D1 of an upper switch Stop of the scan drive integrated circuit 1300 is disposed in a direction in which an anode faces the lower switch Sbot, and a cathode is an energy recovery circuit. It may be disposed in a direction toward 1310.

The energy recovery circuit 1310 includes a capacitor C, a first switch S1, a second switch S2, an inductor L, a third switch S3, and a fourth switch S4. can do.

The voltage of the scan electrode Y may be recovered and stored in the capacitor C, and the voltage stored in the capacitor C may be supplied to the scan electrode Y.

The inductor L may be disposed between the capacitor C and the scan electrode or the sustain electrode. The inductor L may generate resonance when the voltage stored in the capacitor C is supplied to the scan electrode and when the voltage of the scan electrode is recovered to the capacitor C. FIG.

The first switch S1 and the second switch S2 may be arranged in parallel between the inductor L and the capacitor C. FIG. That is, the first switch S1 and the second switch S2 may be arranged in parallel between the first node n1 and the second node n2.

The first switch S1 may supply a voltage stored in the capacitor C to the scan electrode in the rising period of the sustain signal SUS through a predetermined switching operation.

The second switch S2 may recover the voltage of the scan electrode to the capacitor C during the falling period of the sustain signal SUS through a predetermined switching operation.

The fourth switch S4 may be disposed between the scan electrode and the sustain voltage source for supplying the sustain voltage Vs. That is, the fourth switch S3 is disposed between the third node n3 and the sustain voltage source.

The fourth switch S4 can supply the sustain voltage Vs to the scan electrodes through a predetermined switching operation.

The third switch S3 may be disposed between the scan electrode and the ground GND. That is, the third switch S4 is disposed between the third node n3 and the ground GND.

The third switch S3 may supply a voltage of the ground level GND to the scan electrode through a predetermined switching operation.

An example of the operation of the driving unit is as follows. In the following description, the first and second sustain signals are not distinguished for convenience of description. In addition, since the scan reference voltage supply unit 1320 does not operate in the process of supplying the sustain signal, a description thereof will be omitted.

As shown in FIG. 14, the second, third, and fourth switches S2, S3, and S4 and the lower switch Sbot are turned off in the turn-off state as shown in the rising period rp of the sustain signal. S1) and the upper switch (Stop) may be turned on.

Then, as shown in (1) of FIG. 15, the voltage stored in the capacitor C may be supplied to the scan electrode through the LC resonance by the inductor L in the rising period rp. Then, the voltage of the scan electrode may gradually increase from the voltage of the ground level GND to the sustain voltage Vs.

Thereafter, in the sustain period mp, the fourth switch S4 may be turned on while the first switch S1 and the upper switch Stop are turned on.

Then, as shown in (3) of FIG. 15, the second voltage Vs generated by the sustain voltage source, that is, the sustain voltage Vs may be supplied to the scan electrode. Then, the voltage of the scan electrode can substantially maintain the sustain voltage (Vs).

Thereafter, the first switch S1 and the fourth switch S4 may be turned off in the falling period fp.

Then, as shown in FIG. 15 (2), the voltage of the electrode may be recovered to the capacitor C through LC resonance by the inductor L. As a result, the voltage of the scan electrode may gradually decrease from the sustain voltage Vs to the voltage of the ground level GND.

In addition, after the falling period fp, the third switch S3 may be turned on.

Then, a current path from the scan electrode to the ground GND may be formed from the scan electrode via the third switch S3, as shown in FIG. 15, so that the voltage of the scan electrode is substantially at the ground level GND. Voltage can be maintained.

It is possible to supply the sustain signal SUS to the scan electrode using the above-described driving unit and method.

Referring to FIG. 16, a first scan drive integrated circuit 1301 for supplying a first sustain signal SUS1 at a first time point to a first scan electrode Y1 of a plurality of scan electrodes in a sustain period and a first scan electrode among a plurality of scan electrodes is shown. The second scan integrated circuit supplies a second sustain signal SUS1 corresponding to the first sustain signal to the second scan electrode Y2 at a second time point later in time than the first time point, the second sustain signal SUS1 having a smaller pulse width than the first sustain signal. 1302.

In addition, the first scan integrated circuit 1301 includes a first upper switch Stop1 and a first lower switch Sbot1, and the second scan integrated circuit 1302 includes a second upper switch Stop2 and a second lower part. It may include a switch Sbot2.

The operation of the driver of FIG. 16 will be described with reference to FIG. 17.

Referring to FIG. 17, the length of the turn-on period of the first upper switch Stop1 of the first scan drive integrated circuit 1301 may be equal to the length of the second upper switch of the second scan drive integrated circuit 1302. Longer than the length of the turn-on period of Stop2). In other words, the second upper switch (1) of the second scan drive integrated circuit 1302 for a part of the period during which the first upper switch Stop1 of the first scan drive integrated circuit 1301 is turned on. Stop2) and the second lower switch Sbot2 are both turned off.

Then, the pulse width of the first sustain signal supplied to the first scan electrode Y1 may be wider than the pulse width of the second sustain signal supplied to the second scan electrode Y2.

As described above, when the output of the energy recovery circuit 1310 is supplied to one end of the upper switch Stop of the scan drive integrated circuit 1300 through the fourth node n4, the turn-on of the upper switch Stop is turned on. By simply adjusting the period, it is possible to adjust the time of application of the sustain signal differently. Accordingly, it is not necessary to add another circuit configuration, for example, a buffer for delaying the timing signal, in order to adjust the application time of the sustain signal differently, so that the increase in manufacturing cost can be suppressed.

18 illustrates a case in which the output of the energy recovery circuit 1310 is input to the lower switch Sbot of the scan drive integrated circuit 1300, unlike the present invention.

In this case, the output voltage of the energy recovery circuit 1310 may be supplied to the scan electrode through the internal diode of the lower switch Sbot. Accordingly, in the driving unit of FIG. 18, even when the lower switch Sbot is turned off, the sustain signal is supplied to the scan electrode because the output voltage of the energy recovery circuit 1310 is supplied to the scan electrode through the internal diode of the lower switch Sbot. The timing of their application cannot be adjusted differently.

However, in the case of FIG. 18, it is possible to differently adjust the end points of the sustain signals as shown in FIG. 19.

As shown in FIG. 19, the application time point of the first sustain signal SUS1 and the application time point of the second sustain signal SUS2 are the same, and the end point of the first sustain signal SUS1 and the end point of the second sustain signal SUS2 are the same. When the viewpoints are adjusted differently, it is difficult to sufficiently reduce the occurrence of noise and electromagnetic interference. The reason is that the sustain voltage (Vs) is supplied to the scan electrodes at the time of supply of the sustain signal, whereas the voltage of the scan electrodes is recovered to the capacitor at the end of the sustain signal, so that the peaking voltage is mainly the supply of the sustain signal. Because it occurs at a point in time.

Alternatively, as illustrated in FIG. 20, the application time point of the first sustain signal SUS1 and the application time point of the second sustain signal SUS2 are different from each other, and the end point of the first sustain signal SUS1 and the second sustain signal SUS2 are different from each other. Suppose you want to control the end points of a) differently.

In this case, a switching element for adjusting the supply point of the sustain signal or a switching element for adjusting the end point of the sustain signal should be added. Alternatively, a buffer for further delaying the timing signal is needed. Accordingly, in order to achieve the case shown in FIG. 20, the manufacturing cost may increase because the circuit configuration is greatly changed or a switching element must be added.

On the other hand, the driving unit according to the present invention as shown in Figs. 13 to 17 by connecting the output terminal of the energy recovery circuit 1310 to one end of the upper switch (Stop) of the scan drive integrated circuit 1300 Since it is possible to adjust the time of application differently, it is possible to suppress the increase in manufacturing costs.

21 shows a simulation output of a drive unit according to the present invention.

FIG. 21 shows a first sustain signal ① supplied to any one of the plurality of scan electrodes, and a second sustain signal ② having a smaller pulse width than the first sustain signal. It is a case where it is supplied later than a 1st sustain signal, and the 3rd sustain signal (3) whose pulse width is smaller than a 2nd sustain signal is supplied to an arbitrary 3rd scan electrode later than a 2nd sustain signal.

In addition, in FIG. 21, the fourth sustain signal ④ is a sustain signal used when all of the application time points of the sustain signals are the same as the comparative example.

Referring to FIG. 21, the voltages of the first sustain signal ①, the second sustain signal ②, and the third sustain signal ③ are Vx1 at a time of about 5.40 ㎲, whereas the voltage of the fourth sustain signal ④ is It can be seen that Vx2 is lower than Vx1. This is because the first sustain signal ①, the second sustain signal ②, and the third sustain signal ③ start at different points in time, so that the time taken to reach a certain target voltage is reduced by distributing the load. Can be interpreted

In addition, the first sustain signal ①, the second sustain signal ②, and the third sustain signal ③ are lowered to a voltage lower than Vx1 in the tenth period d10 during the period of increasing voltage, and then again to the eleventh period. It can be seen that the voltage rises to the maximum voltage in the period d11. In the eleventh period d11, since the voltage change rate may have a large value instantaneously, the intensity of the sustain discharge may increase.

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 a configuration of a plasma display device;

2 is a diagram for explaining the structure of a plasma display panel;

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

4 is a view for schematically explaining a method of driving a plasma display device;

5 to 9 are diagrams for explaining a sustain signal;

10 to 12 are views for explaining the form of the sustain signal in more detail;

13 to 21 are views for explaining the configuration and operation of the driver for supplying the sustain signal.

Claims (19)

A plasma display panel including a plurality of scan electrodes, a plurality of sustain electrodes, and a plurality of address electrodes crossing the scan electrodes and the sustain electrodes; And A driver configured to supply sustain signals having different pulse widths to at least two scan electrodes of the plurality of scan electrodes at different points in time during a sustain period of at least one subfield among a plurality of sub-fields of a frame; Plasma display device comprising a. A driving method of a plasma display apparatus comprising a plurality of scan electrodes, a plurality of sustain electrodes, a plurality of address electrodes intersecting the scan electrodes and the sustain electrodes, Supplying a first sustain signal at a first time point to a first scan electrode of the plurality of scan electrodes in a sustain period of at least one subfield of a plurality of sub-fields of a frame; And Supplying a second sustain signal corresponding to the first sustain signal to a second scan electrode of the plurality of scan electrodes at a second time point later in time than the first time point, the second sustain signal having a smaller pulse width than the first sustain signal; ; Method of driving a plasma display device comprising a. The method of claim 2, And a termination point of the first sustain signal and the second sustain signal is substantially the same. The method of claim 1, The first sustain signal is a first period of rising from a first voltage to a second voltage at a first rate of change, a second period of rising from a second voltage to a third voltage at a second rate of change less than the first rate of change, wherein A third period of maintaining a third voltage and a fourth period of falling from the third voltage to the first voltage, And wherein the second sustain signal has a third rate of change greater than the second rate of change in the second period. The method of claim 4, wherein And the second sustain signal has a voltage at ground level (GND) in the first period. The method of claim 4, wherein And the second sustain signal rises from the first voltage to a fourth voltage smaller than the second voltage in the first period. The method of claim 4, wherein And the second scan electrode is floating in the first period. The method of claim 4, wherein And a period in which the first sustain signal and the second sustain signal fall and then rise again during the second period. The method of claim 2, And a supply order of the first sustain signal and a supply order of the second sustain signal are the same. A driving method of a plasma display apparatus comprising a plurality of scan electrodes, a plurality of sustain electrodes, a plurality of address electrodes intersecting the scan electrodes and the sustain electrodes, Supplying a first sustain signal at a first time point to an odd-numbered scan electrode of the plurality of scan electrodes in a sustain period of at least one subfield of a plurality of sub-fields of a frame; And Supplying a second sustain signal corresponding to the first sustain signal and having a different pulse width from the first sustain signal to a second scan electrode of the plurality of scan electrodes at a second time point different from the first time point; Method of driving a plasma display device comprising a. 11. The method of claim 10, A method of driving a plasma display device, wherein a supply point of a pulse width smaller than the first sustain signal and the second sustain signal is later in time than another supply point. A driving method of a plasma display apparatus comprising a plurality of scan electrodes, a plurality of sustain electrodes, a plurality of address electrodes intersecting the scan electrodes and the sustain electrodes, Supplying a first sustain signal to a first scan electrode of the plurality of scan electrodes in a sustain period of at least one subfield of a plurality of sub-fields of a frame; And Floating a second scan electrode of the plurality of scan electrodes during a portion of a period during which the first sustain signal is supplied to the first scan electrode; Method of driving a plasma display device comprising a. A plasma display panel including a plurality of scan electrodes, a plurality of sustain electrodes, and a plurality of address electrodes crossing the scan electrodes and the sustain electrodes; And A driver configured to supply sustain signals having different pulse widths to at least two scan electrodes of the plurality of scan electrodes at different points in time during a sustain period of at least one subfield among a plurality of sub-fields of a frame; Including, The driving unit A scan drive integrated circuit including an upper switch and a lower switch; And An energy recovery circuit for recovering the voltage of the scan electrode and supplying the recovered voltage to the scan electrode; Including, A node between the other end of the upper switch and one end of the lower switch is connected to the scan electrode, the other end of the lower switch is connected to a negative scan voltage source for supplying a negative scan voltage, and the output terminal of the energy recovery circuit is A plasma display device connected to one end of the upper switch. The method of claim 13, The inner diode of the upper switch is disposed in a direction in which an anode faces the lower switch, and the cathode is disposed in a direction toward the energy recovery circuit. The method of claim 13, The driving unit A first scan drive integrated circuit configured to supply a first sustain signal at a first time point to a first scan electrode of the plurality of scan electrodes in the sustain period; And A second sustain signal corresponding to the first sustain signal and having a smaller pulse width than the first sustain signal to a second scan electrode of the plurality of scan electrodes at a second time later in time than the first time point; 2 scan integrated circuits; Including, And a length of a turn-on period of the upper switch of the first scan drive integrated circuit is longer than a length of a turn-on period of the upper switch of the second scan drive integrated circuit. The method of claim 15, Plasma display in which both the upper switch and the lower switch of the second scan drive integrated circuit are turned off during a part of the period during which the upper switch of the first scan drive integrated circuit is turned on. Device. A driving method of a plasma display apparatus comprising a plurality of scan electrodes, a plurality of sustain electrodes, a plurality of address electrodes intersecting the scan electrodes and the sustain electrodes, Supplying a first sustain signal at a first time point to a first scan electrode of the plurality of scan electrodes in a sustain period of at least one subfield of a plurality of sub-fields of a frame; And Supplying a second sustain signal corresponding to the first sustain signal to a second scan electrode of the plurality of scan electrodes at a second time point later in time than the first time point, the second sustain signal having a smaller pulse width than the first sustain signal; ; Including, The first sustain signal and the second sustain signal include a rising period in which the voltage rises from the voltage of the ground level GND to the maximum voltage, a sustain period in which the maximum voltage is maintained, and a voltage of the ground level GND from the maximum voltage. Including falling period of falling to voltage, The length of the rising period of the first sustain signal is longer than the length of the rising period of the second sustain signal, the length of the sustain period of the first sustain signal and the second sustain signal are the same. The method of claim 17, And a falling period of the first sustain signal and a falling period of the second sustain signal are substantially equal to each other. A plasma display panel including a plurality of scan electrodes, a plurality of sustain electrodes, and a plurality of address electrodes crossing the scan electrodes and the sustain electrodes; A scan driver configured to supply sustain signals having different pulse widths to at least two scan electrodes of the plurality of scan electrodes at different time points in a sustain period of at least one subfield of a plurality of sub-fields of a frame; And A sustain driver for supplying sustain signals having different pulse widths to at least two sustain electrodes of the plurality of sustain electrodes at different points in the sustain period; Plasma display device comprising a.

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