KR20100070117A - Plasma display apparatus - Google Patents

Abstract

PURPOSE: A plasma display apparatus is provided to use the sustain signal of the sine wave form. The generation of the electromagnetic interference and noise is reduced. CONSTITUTION: A plasma display panel(100) Ag electrode is included. In the driving part(110) is the sustain period of one or more subfield among a plurality of subfields of the frame the sustain signal having the sine wave form. The sustain signal from the first voltage lower than the voltage of the ground level to the second voltage higher than the voltage of the ground level the swing.

Description

Plasma Display Apparatus {Plasma Display Apparatus}

The present invention relates to a plasma display device.

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.

An object of the present invention is to provide a plasma display device capable of supplying a sustain signal to an electrode in a sustain period without using an energy recovery circuit.

A plasma display device according to the present invention has a sine wave shape at an electrode in a sustain period of at least one subfield among a plurality of subfields of a frame and a plasma display panel including an electrode. It may include a driver for supplying a sustain signal.

In addition, the sustain signal may swing from the first voltage V1 lower than the voltage of the ground level GND to the second voltage V2 higher than the voltage of the ground level.

In addition, the electrodes may include scan electrodes and sustain electrodes parallel to each other, and the sustain signal may be supplied to the scan electrodes and the sustain electrodes.

In addition, the phase difference between the sustain signal supplied to the scan electrode and the sustain signal supplied to the sustain electrode may be 180 Hz.

In addition, the electrodes may include scan electrodes and sustain electrodes that are parallel to each other, and the sustain signal may be supplied to either the scan electrode or the sustain electrode, and the other may be supplied with a reference voltage in the sustain period.

In addition, another plasma display apparatus according to the present invention supplies a sustain signal to an electrode in a sustain period of at least one subfield among a plurality of subfields of a frame and a plasma display panel including an electrode. And a driving unit configured to supply a DC voltage DC rectified from the AC voltage AC input from the outside in a first direction or a second direction opposite to the first direction, and a first direction and a first direction. It may include a sustain generator for generating a sine wave sustain signal with a DC voltage supplied in two directions to supply to the electrode.

In addition, the voltage supply unit includes a DC voltage supply unit for supplying a DC voltage, a first switch for setting the supply direction of the DC voltage in the first direction, a second switch, and a third switch for setting the supply direction of the DC voltage in the second direction And a fourth switch.

In addition, the sustain generator may include a transformer for generating a sine wave sustain signal by converting a DC voltage according to a predetermined winding ratio.

In addition, the sustain generator may further include an inductor for LC resonance of the DC voltage.

In addition, a switching element may not be disposed between the transformer and the electrode.

The voltage supply unit may further include a DC voltage supply unit for supplying a DC voltage, a first switch disposed in parallel with the DC voltage supply unit between one end and the other end of the DC voltage supply unit, and a first disposed between the first switch and the other end of the DC voltage supply unit. A fourth switch, a third switch disposed in parallel with the DC voltage supply unit and the first switch between one end and the other end of the DC voltage supply unit, and a second switch disposed between the third switch and the other end of the DC voltage supply unit; When the node between the switch and the third switch is a first node and the node between the third switch and the second switch is a second node, the sustain generator is disposed between the first node and the second node. It may include a transformer.

The inductor may further include an inductor disposed in series with the transformer between the first node and the second node.

In addition, the driving unit may not include an energy recovery circuit.

The plasma display device according to the present invention has the effect of reducing the manufacturing cost by supplying a sustain signal to the electrode without using an energy recovery circuit.

In addition, the plasma display apparatus according to the present invention has an effect of reducing the occurrence of noise and electromagnetic interference (EMI) by using a sine wave sustain signal.

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

1 is a view for explaining the configuration of a plasma display device according to an embodiment of the present invention.

Referring to FIG. 1, a plasma display apparatus according to an exemplary embodiment may include 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 may implement an image in a frame including a plurality of subfields.

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 does not include an energy recovery circuit, and the plasma display panel in the sustain period of at least one subfield of the plurality of subfields of the frame. It is possible to supply a sustain signal having a sine wave form to the electrode of.

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 front substrate 201 on 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. And a back substrate 211 on which address electrodes 213 and X intersect with (203, Z) are formed.

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 the height of the first partition 212b and the 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. 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 view for explaining an example of a driving waveform for operating the 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 of the sustain signal, and a sustain discharge, that is, a display discharge occurs between the scan electrode and the sustain electrode when the sustain signal is supplied. Can be.

In this way, an image can be realized.

5 to 7 are views for explaining the sustain signal in more detail.

First, referring to FIG. 5, the sustain signal SUS supplied to at least one of the scan electrode and the sustain electrode in the sustain period may have a sine wave shape.

In detail, in the sustain period, a sine wave sustain signal SUS may be supplied to the scan electrode and the sustain electrode, and a sine wave sustain signal SUS supplied to the scan electrode and a sine wave form supplied to the sustain electrode. The phase difference of the sustain signal SUS may be approximately 180 Hz.

In addition, the sustain signal SUS may have a form of swinging from the first voltage V1 lower than the voltage of the ground level GND to the second voltage V2 higher than the voltage of the ground level.

In this case, when the voltage of the sustain signal supplied to the scan electrode is the second voltage V2, the voltage of the sustain signal supplied to the sustain electrode becomes the first voltage V1, whereby the second voltage V2 and the first voltage. Sustain discharge may occur between the scan electrode and the sustain electrode due to the voltage difference V2 + V1 of the voltage V1.

As described above, in the case of supplying a sine wave sustain signal, since the sine wave has a gentle voltage change rate, generation of noise and electromagnetic interference (EMI) can be reduced in the sustain period.

On the other hand, as in the case of Figure 5 it may be possible to supply a sustain signal so that the phase difference is approximately 180 ㅀ to the scan electrode and the sustain electrode, as shown in Figures 6 to 7 only one of the scan electrode or the sustain electrode It may be possible to supply a sustain signal and supply a predetermined reference voltage, for example, a ground level GND, to the other electrode.

In detail, as shown in FIG. 6, a sustain signal having a sine wave shape is supplied to the scan electrode by swinging from the third voltage V3 to the fourth voltage V4, and the ground level GND is supplied to the sustain electrode. It is possible to do

Here, the fourth voltage V4 may be substantially twice the second voltage V2 of FIG. 5, and the third voltage V3 is also substantially twice the first voltage V1 of FIG. 5. It may be possible.

In addition, only the polarity of the first voltage V1 and the second voltage V2 may be substantially the same in magnitude. In addition, only the polarities of the third voltage V3 and the fourth voltage V4 may be substantially the same in magnitude.

8 to 12 are views for explaining the configuration of the driving unit in more detail.

First, referring to FIG. 8, the driving unit 110 according to the present invention is a voltage source 800 for converting and supplying an AC voltage AC input from the outside into a DC voltage DC, and a voltage source 800. The driving signal supply unit 810 may supply a driving signal to a scan electrode or a sustain electrode of the plasma display panel using a DC voltage supplied by the N-axis.

The voltage source 800 may include a first converter 801 that converts an AC voltage into a DC voltage, and the driving signal supply unit 810 may include a second converter 811 that converts a DC voltage into an AC voltage. have.

Here, the first converter 801 is an AC-DC converter for converting an AC voltage into a DC voltage, and the second converter 811 is a DC-AC converter for converting a DC voltage into an AC voltage. DC-AC) converter.

The second converter 811 may generate a sine wave sustain signal using a DC voltage, and supply the sine wave sustain signal to a scan electrode or a sustain electrode.

In addition, the second conversion unit 811 supplies a voltage supply unit 900 for supplying the DC voltage DC rectified from the AC voltage AC input from the outside in a first direction or in a second direction opposite to the first direction. And a sustain generator 910 for generating a sine wave sustain signal by using a DC voltage supplied in a first direction and a second direction and supplying it to an electrode of the plasma display panel.

In addition, the voltage supply unit 900 supplies a DC voltage supply unit Cdc for supplying a DC voltage, a first switch S1 and a second switch S2 for setting the supply direction of the DC voltage in the first direction, and a DC voltage. It may include a third switch (S3) and the fourth switch (S4) for setting the direction in the second direction.

Here, the first direction is a direction from the first node n1 to the second node n2 via the inductor L and the transformer T, and the second direction is the transformer T from the second node n2. And a direction toward the first node n1 via the inductor L. FIG.

In addition, the sustain generator 910 may include a transformer (T) for converting a DC voltage according to a predetermined winding ratio to generate a sine wave-shaped sustain signal, and the sustain generator 910 may generate a resonance frequency. It may be possible to further include an inductor L for resonating the DC voltage to match. Here, the inductor L can be omitted.

Looking at the configuration of the second conversion unit 811 in more detail, the first switch (S1) in the voltage supply unit 900 is a DC voltage supply unit (Cdc) between one end and the other end of the DC voltage supply unit (Cdc) for supplying a DC voltage ) May be arranged in parallel.

In addition, the fourth switch S4 may be disposed between the first switch S1 and the other end of the DC voltage supply part Cdc.

In addition, the third switch S3 may be disposed in parallel with the DC voltage supply part Cdc and the first switch S1 between one end and the other end of the DC voltage supply part Cdc.

In addition, the second switch S2 may be disposed between the third switch S3 and the other end of the DC voltage supply part Cdc.

In addition, a node between the first switch S1 and the third switch S3 is referred to as a first node n1 and a node between the third switch S3 and the second switch S2 is referred to as a second node. When referred to as a node n2, the transformer T of the sustain generator 910 may be disposed between the first node n1 and the second node n2.

In addition, when the sustain generator 910 further includes an inductor L, the inductor L may be disposed in series with the transformer T between the first node n1 and the second node n2.

Here, it can be seen that no switching element is disposed between the transformer T of the sustain generator 910 and the scan electrode and the sustain electrode electrode of the plasma display panel. Accordingly, the sine wave sustain signal output from the transformer T is directly supplied to at least one of the scan electrode and the sustain electrode without passing through other switching elements.

In addition, the driving unit 110 according to the present invention as shown in FIGS. 8 to 9 supplies a sine wave sustain signal to at least one of a direct scan electrode and a sustain electrode using a transformer T, and an energy recovery circuit (Energy) Recovery circuit) is not included.

The operation of the driving unit 110 as described above, in detail, the operation of the second conversion unit 811 will be described below.

Referring to FIG. 10, the first switch S1 and the second switch S2 may be turned on at a time t1.

Then, as in the case of FIG. 11, the DC voltage supply unit Cdc, the third node n3, the first switch S1, the first node n1, the inductor L, the transformer T, and the second switch ( S2), a current path via the fourth node n4 may be formed. In other words, it forms a path through which current can flow in the first direction.

Accordingly, the DC voltage Vdc may be gradually supplied from the DC voltage supply part Cdc to the transformer T, and thus the current i _L flowing through the inductor _L may gradually increase. At this time, according to the winding ratio Np / Ns of the transformer T, the electromotive force in the opposite direction to the primary side is generated on the secondary side of the transformer T, so that the voltage applied to the panel capacitor Cp as shown in FIG. 10. (Vp) can gradually increase from negative to positive.

Thereafter, the third and fourth switches S3 and S4 may be turned on in a state where the first switch S1 and the second switch S2 are turned off at a time t3.

Then, as in the case of FIG. 12, the DC voltage supply unit Cdc, the third node n3, the third switch S3, the second node n2, the transformer T, the inductor L, and the first node ( n1), a current path via the fourth switch S4 and the fourth node n4 may be formed. In other words, it forms a path through which current can flow in the second direction.

Accordingly, the DC voltage supply part Cdc is applied to the transformer T in the reverse direction, so that the current i _L flowing in the inductor _L may gradually decrease. At this time, according to the winding ratio Np / Ns of the transformer T, the electromotive force in the opposite direction to the primary side is generated on the secondary side of the transformer T, so that the voltage Vp applied to the panel capacitor Cp as shown in FIG. 10. ) May gradually decrease from positive to negative.

In this way, a sine wave sustain signal may be supplied to at least one of the scan electrode and the sustain electrode.

13-15 is a figure for demonstrating a comparative example.

First, referring to FIG. 13, an example of an energy recovery circuit is illustrated. Since the energy recovery circuit shown in FIG. 13 is a well known configuration as a general configuration, it will be briefly described.

The energy recovery circuit may include a capacitor C, an inductor L, and tenth, twenty, thirty, and forty switches S10, S20, S30, and S40.

Here, the tenth switch S10 may supply energy stored in the capacitor C to at least one of the scan electrode and the sustain electrode through a predetermined switching operation.

In addition, the twentieth switch S20 may recover at least one voltage of the scan electrode and the sustain electrode to the capacitor C through a predetermined switching operation.

In addition, the thirtieth switch S30 may supply the sustain voltage Vs to at least one of the scan electrode and the sustain electrode through a predetermined switching operation.

In addition, the 40th switch S40 may ground at least one of the scan electrode and the sustain electrode through a predetermined switching operation.

In this configuration, when the tenth switch S10 is turned on in the period d1 as shown in FIG. 14, the voltage stored in the capacitor C is supplied to at least one of the scan electrode and the sustain electrode through LC resonance by the inductor L. Can be. As a result, the voltage of at least one of the scan electrode and the sustain electrode may gradually increase.

Thereafter, when the thirtieth switch S30 is turned on, the sustain voltage Vs supplied by the sustain voltage source may be supplied to at least one of the scan electrode and the sustain electrode. Then, as in the period d2 of FIG. 14, at least one voltage of the scan electrode and the sustain electrode may maintain the sustain voltage Vs.

Thereafter, when the twentieth switch S20 is turned on while the tenth switch S10 and the thirtieth switch S30 are turned off, at least one voltage of the scan electrode and the sustain electrode is applied to the inductor L. By LC resonance can be recovered to the capacitor (C).

Then, as in the period d3 of FIG. 14, the voltages of the scan electrode and the sustain electrode may gradually decrease.

Thereafter, when the 40th switch S40 is turned on, a voltage of the ground level GND may be supplied to at least one of the scan electrode and the sustain electrode.

In this way, the driving unit according to the comparative example can supply the sustain signal to at least one of the scan electrode and the sustain electrode.

However, since the driving unit of the configuration according to the comparative example should include the energy recovery circuit as shown in FIG. 13, the manufacturing cost may increase.

On the other hand, since the driving unit according to the present invention does not include an energy recovery circuit as shown in FIG. 9, the manufacturing unit may have a relatively low manufacturing cost.

In addition, the driving unit according to the comparative example including the energy recovery circuit of FIG. 13 needs another voltage circuit for generating the sustain voltage Vs, which is a DC voltage.

For example, as illustrated in FIG. 15, a voltage source 1500 that converts an AC voltage input from the outside into a DC voltage DC and supplies the first voltage converts the AC voltage into a DC voltage. And a sustain converter 1502 for generating the sustain voltage Vs with the DC voltage first converted and output by the first converter 1501.

Here, the first converter 1501 is an AC-DC converter for converting an AC voltage into a DC voltage, and the sustain converter 1502 is a DC-DC for converting the DC voltage back to a DC voltage. (DC-DC) converter.

If the voltage source 1500 does not include the sustain converter 1502, the driving may become unstable because the DC voltage generated by the first converter 1501 is not stabilized.

In addition, the driving unit according to the comparative example may include a driving signal supply unit 1510 for supplying a driving signal to the scan electrode or the sustain electrode of the plasma display panel using a DC voltage supplied from the voltage source 1500, the driving signal supply unit 1510 may include a driving circuit 1511 including an energy recovery circuit as shown in FIG. 13.

As such, the driving unit according to the comparative example should further include a DC-DC converter, that is, a sustain converter 1502 capable of stably generating the sustain voltage Vs according to the use of the energy recovery circuit. Since the circuit must also be included, manufacturing costs can increase.

On the other hand, in the driving unit according to the present invention as shown in FIG. 8, the energy recovery circuit may be omitted, and the DC-DC converter may also be omitted, thereby significantly reducing the manufacturing cost.

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 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 following claims rather than the foregoing description, and the meaning and scope of the claims. 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 view for explaining the configuration of a plasma display device according to an embodiment of the present invention.

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

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

4 is a diagram for explaining an example of a driving waveform for operating a plasma display device.

5 to 7 are views for explaining the sustain signal in more detail.

8 to 12 are views for explaining the configuration of the drive unit in more detail.

13-15 is a figure for demonstrating a comparative example.

Claims (13)

A plasma display panel including an electrode; And A driver configured to supply a sustain signal having a sine wave form to the electrode in a sustain period of at least one subfield among a plurality of subfields of a frame; Plasma display device comprising a. The method of claim 1, And the sustain signal swings from a first voltage (V1) lower than a voltage at ground level (GND) to a second voltage (V2) higher than a voltage at ground level. The method of claim 1, The electrode includes a scan electrode and a sustain electrode parallel to each other, And the sustain signal is supplied to the scan electrode and the sustain electrode. The method of claim 3, wherein And a phase difference between the sustain signal supplied to the scan electrode and the sustain signal supplied to the sustain electrode is 180 Hz. The method of claim 1, The electrode includes a scan electrode and a sustain electrode parallel to each other, And the sustain signal is supplied to either the scan electrode or the sustain electrode, and the other is supplied with a reference voltage during the sustain period. A plasma display panel including an electrode; And A driver supplying a sustain signal to the electrode in a sustain period of at least one subfield among a plurality of subfields of a frame; Including, The driving unit A voltage supply unit configured to supply a DC voltage DC rectified from an AC voltage AC input from an external device in a first direction or a second direction opposite to the first direction; And A sustain generator for generating the sustain signal in the form of a sine wave with the DC voltage supplied in the first direction and the second direction and supplying the sustain signal to the electrode; Plasma display device comprising a. The method of claim 6, The voltage supply unit A DC voltage supply unit supplying the DC voltage; A first switch and a second switch for setting the supply direction of the DC voltage in the first direction; And A third switch and a fourth switch for setting the supply direction of the DC voltage in the second direction; Plasma display device comprising a. The method of claim 6, And a sustain generator converting the DC voltage according to a predetermined turns ratio to generate a sine wave sustain signal. The method of claim 8, And the sustain generator further comprises an inductor for LC resonance of the DC voltage. The method of claim 8, And a switching element is not disposed between the transformer and the electrode. The method of claim 6, The voltage supply unit A DC voltage supply unit supplying the DC voltage; A first switch disposed in parallel with the DC voltage supply unit between one end and the other end of the DC voltage supply unit; A fourth switch disposed between the first switch and the other end of the DC voltage supply unit; A third switch disposed in parallel with the DC voltage supply unit and the first switch between one end and the other end of the DC voltage supply unit; And A second switch disposed between the third switch and the other end of the DC voltage supply unit; Including, When a node between the first switch and the third switch is a first node, and a node between the third switch and the second switch is a second node, The sustain generator is And a transformer disposed between the first node and the second node. The method of claim 11, And an inductor disposed in series with the transformer between the first node and the second node. The method of claim 6, The driving unit A plasma display device that does not include an energy recovery circuit.

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