KR20080018367A - Plasma display device - Google Patents

Abstract

A plasma display device is provided to reduce a noise by supplying a down signal to fall faster than a ramp-down signal, to a first electrode. A plasma display device includes a PDP(Plasma Display Panel)(100) and a driving unit(110). The PDP includes first and second electrodes which are parallel to each other. During a reset period, the driving unit supplies a ramp-up signal and a ramp-down signal to the first electrode. The driving unit supplies a falling signal to the first electrode. Between the ramp-up signal and the ramp-down signal, the falling signal falls at a slope greater than the ramp-down signal from a voltage level lower than the maximum voltage of the ramp-up signal. The slope of the falling signal is substantially equal to the slope of a sustain signal which is supplied to at least one of the first and second electrodes during a sustain period which follows the reset period.

Description

Plasma Display Apparatus {Plasma Display Apparatus}

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

2A to 2B are views for explaining an example of a plasma display panel that can be included in a plasma display device according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating an image frame for implementing grayscale of an image in a plasma display device according to an embodiment of the present invention. FIG.

4 is a view for explaining an example of the operation of the plasma display device according to an embodiment of the present invention.

5 is a diagram for explaining another type of a sustain signal.

6 is a diagram for explaining a falling signal in more detail.

7 is a diagram for explaining a reason for supplying a falling signal.

8 is a diagram for explaining another form of the reset signal.

9 is a view for explaining an example of the configuration of a drive unit of the plasma display device according to an embodiment of the present invention.

10 is a view for explaining an example of the operation of the driving unit of FIG. 9 for supplying a sustain signal;

FIG. 11 is a view for explaining an example of the operation of the driving unit of FIG. 9 for supplying a falling signal; FIG.

<Description of the numbers for the main parts of the drawings>

100: plasma display panel 110: driver

The present invention relates to a plasma display device (Plasma Display Apparatus).

The plasma display apparatus includes a plasma display panel having electrodes formed thereon, and a driving unit supplying predetermined driving signals to the electrodes of the plasma display panel.

In general, a phosphor layer is formed in a discharge cell (Cell) partitioned by a partition, and a plurality of electrodes are formed in the plasma display panel.

The driver supplies a driving signal to the discharge cell through the electrode.

Then, 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 light such as ultraviolet rays, and the light such as ultraviolet light emits phosphors formed in the discharge cell. Generates visible light The visible light displays an image on the screen of the plasma display panel.

On the other hand, there is a problem that a relatively large noise occurs in the conventional plasma display device.

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide a plasma display apparatus which reduces the generation of noise by improving a signal supplied to a first electrode in a reset period.

A plasma display device according to an embodiment of the present invention for achieving the above object is a plasma display panel including a first electrode and a second electrode parallel to each other, and a ramp up ramp on the first electrode in the reset period to perform the initialization -Up) and a ramp down signal (Ramp-Down), and the falling between the rising ramp signal and the falling ramp signal to a slope steeper than the slope of the falling ramp signal from a voltage lower than the maximum voltage of the rising ramp signal It may include a driver for supplying a signal to the first electrode.

In addition, the slope of the falling signal may be substantially the same as the slope of the sustain signal supplied to at least one of the first electrode and the second electrode in the sustain period after the reset period.

In addition, the length of the supply period of the falling signal may be 5ns (nanoseconds) or more and 1000ns (nanoseconds) or less.

Also, the lowest voltage of the falling signal may be higher than the voltage of the ground level GND.

In addition, the difference between the end time of the rising ramp signal and the supply time of the falling signal may be 530 ns (nanoseconds) or less.

Also, the falling signal may be generated through LC resonance.

Hereinafter, a plasma display device according to an embodiment of 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.

1, a plasma display apparatus according to an embodiment of the present invention includes a plasma display panel 100 and a driver 110.

The driver 110 supplies a ramp-up signal and a ramp-down signal to the first electrode of the plasma display panel 100 during a reset period, and the ramp-up signal and the ramp-down lamp are supplied. Between the signals, a falling signal is supplied to the first electrode, which falls to a slope steeper than the slope of the falling ramp signal from a voltage lower than the maximum voltage of the rising ramp signal.

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, when the first electrode and the second electrode parallel to each other and the third electrode crossing the first electrode and the second electrode are formed in the plasma display panel 100 included in the plasma display device of the present invention, The driving unit 110 may be divided into a first driving unit (not shown) for driving the first electrode, a second driving unit for driving the second electrode, and a third driving unit (not shown) for driving the third electrode. .

The driving unit 110 of the plasma display device of the present invention will be more clearly described later.

Here, the plasma display panel 100 displays an image using plasma discharge. An example of such a plasma display panel 100 will be described in detail with reference to FIGS. 2A to 2B.

2A to 2B are views for explaining an example of a plasma display panel that may be included in a plasma display device according to an embodiment of the present invention.

First, referring to FIG. 2A, the plasma display panel includes a front substrate 201 in which first electrodes 202 and Y and second electrodes 203 and Z are parallel to each other, the first electrodes 202 and Y, and The rear substrate 211 on which the third electrodes 213 and X intersecting the second electrodes 203 and Z are formed may be bonded to each other.

Here, the electrodes formed on the front substrate 201, for example, the first electrodes 202 and Y and the second electrodes 203 and Z, generate a discharge in a discharge space, that is, a discharge cell, and at the same time, Discharge can be maintained.

The dielectric layer covers the first electrode 202 and the second electrode 203 and Z on the front substrate 201 where the first electrode 202 and the second electrode 203 and Z are formed. For example, upper dielectric layer 204 may be formed.

This upper dielectric layer 204 limits the discharge current of the first electrode 202, Y and the second electrode 203, Z and between the first electrode 202, Y and the second electrode 203, Z. Can be insulated.

A protective layer 205 is formed on the top surface of the upper dielectric layer 204 to facilitate discharge conditions. The protective layer 205 may be formed through a method of depositing a material such as magnesium oxide (MgO) on the upper dielectric layer 204.

Meanwhile, electrodes, for example, third electrodes 213 and X are formed on the rear substrate 211, and third electrodes 213 and X are formed on the rear substrate 211 on which the third electrodes 213 and X are formed. A dielectric layer, such as lower dielectric layer 215, may be formed to cover the gap.

The lower dielectric layer 215 may insulate the third electrodes 213 and X.

On top of the lower dielectric layer 215, a partition 212, such as a stripe type, a well type, a delta type, a honeycomb type, for partitioning a discharge cell, that is, a discharge cell, is formed. Can be formed. Accordingly, discharge cells such as red (R), green (G), and blue (B) may be formed between the front substrate 201 and the rear substrate 211.

In addition to the red (R), green (G), and blue (B) discharge cells, it is also possible to further form a white (W) or yellow (Yellow: Y) discharge cell.

On the other hand, the pitch of the red (R), green (G) and blue (B) discharge cells in the plasma display panel included in the plasma display device according to an embodiment of the present invention may be substantially the same, The pitches of the red (R), green (G) and blue (B) discharge cells may be different to match the color temperature in the red (R), green (G) and blue (B) discharge cells.

In this case, the pitch may be different for each of the red (R), green (G), and blue (B) discharge cells, but the pitch of one or more discharge cells among the red (R), green (G), and blue (B) discharge cells. May be different from the pitch of other discharge cells. For example, the pitch of the red (R) discharge cells is the smallest, and the pitch of the green (G) and blue (B) discharge cells may be larger than the pitch of the red (R) discharge cells.

Here, the pitch of the green (G) discharge cells may be substantially the same as or different from the pitch of the blue (B) discharge cells.

In addition, the plasma display panel included in the plasma display apparatus according to the exemplary embodiment of the present invention may have not only the structure of the partition wall 212 illustrated in FIG. 2A but also the structure of the partition wall having various shapes. For example, the partition 212 includes a first partition 212b and a second partition 212a, where the height of the first partition 212b and the height of the second partition 212a are different from each other. At least one of the first barrier rib 212b and the second barrier rib 212a, and a channel type barrier rib structure having a channel usable as an exhaust passage, at least one of the first barrier rib 212b and the second barrier rib 212a. Grooved partition wall structure having a groove formed in the groove will be possible.

Here, in the case of the differential partition structure, the height of the first partition 212b of the first partition 212b or the second partition 212a may be lower than the height of the second partition 212a. In addition, in the case of the channel type barrier rib structure or the groove type barrier rib structure, a channel may be formed in the first barrier rib 212b or a groove may be formed.

On the other hand, in the plasma display panel according to an embodiment of the present invention, although the red (R), green (G), and blue (B) discharge cells are shown and described as being arranged on the same line, they may be arranged in different shapes. It will be possible. For example, a delta type arrangement in which red (R), green (G) and blue (B) discharge cells are arranged in a triangular shape may be possible. In addition, the shape of the discharge cell may also be a variety of polygonal shapes, such as pentagonal, hexagonal, as well as rectangular.

Here, 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, red (R), green (G), and blue (B) phosphor layers may be formed.

In addition to the red (R), green (G), and blue (B) phosphors, it is also possible to further form a white (W) and / or yellow (Y) phosphor layer.

In addition, the phosphor layers 214 of the red (R), green (G), and blue (B) discharge cells may have substantially the same thickness or may differ from one or more. For example, if the thickness of the phosphor layer 214 in at least one of the red (R), green (G), and blue (B) discharge cells is different from the other discharge cells, green (G) or blue (B) The thickness of the phosphor layer 214 in the discharge cell may be thicker than the thickness of the phosphor layer 214 in the red (R) discharge cell. Here, the thickness of the phosphor layer 214 in the green (G) discharge cell may be substantially the same as or different from the thickness of the phosphor layer 214 in the blue (B) discharge cell.

Meanwhile, in the above description of FIG. 2A, only the case where the first electrode 202 and the second electrode 203 are formed of one layer each is illustrated and described. However, the first electrode 202 or the second electrode is different from the above description. It is also possible that one or more of 203 consists of a plurality of layers. This will be described with reference to FIG. 2B.

Referring to FIG. 2B, the first electrode 202 and the second electrode 203 may be formed of a plurality of layers, for example, two layers.

In particular, in consideration of light transmittance and electrical conductivity, the first electrode 202 and the second electrode 203 are substantially made of silver (Ag) in order to emit light generated in the discharge cell to the outside and to secure driving efficiency. Bus electrodes 202b and 203b including an opaque material and transparent electrodes 202a and 203a including a transparent material such as transparent indium tin oxide (ITO) may be included.

As such, the reason for the first electrode 202 and the second electrode 203 to include the transparent electrodes 202a and 203a is that the visible light generated in the discharge cell is effectively emitted when emitted to the outside of the plasma display panel. To make it possible.

In addition, the reason why the first electrode 202 and the second electrode 203 include the bus electrodes 202b and 203b is that the first electrode 202 and the second electrode 203 are the transparent electrodes 202a and 203a. ), The driving efficiency can be reduced because the electrical conductivity of the transparent electrodes 202a and 203a is relatively low, so that the low electrical conductivity of the transparent electrodes 202a and 203a can cause such a reduction in the driving efficiency. To compensate.

As described above, in the case where the first electrode 202 and the second electrode 203 include the bus electrodes 202b and 203b, the transparent electrodes 202a and 203b may be used to prevent reflection of external light by the bus electrodes 202b and 203b. Black layers 220 and 221 may be further provided between the 203a and the bus electrodes 202b and 203b.

Meanwhile, the transparent electrodes 202a and 203a may be omitted in the same structure as in FIG. 2B. For example, the first electrode 202 and the second electrode 203 may be formed of only the bus electrodes 202b and 203b without the transparent electrodes 202a and 203a in FIG. 2B. That is, the first electrode 202 and the second electrode 203 are ITO-Less electrodes made of one layer of the bus electrodes 202b and 203b.

In the meantime, only one example of the plasma display panel included in the plasma display apparatus according to the exemplary embodiment of the present invention is illustrated and described, and the present invention is not limited to the plasma display panel having the above-described structure. For example, the description hereinabove illustrates only the case where the top dielectric layer at number 204 and the bottom dielectric layer at number 215 are each one layer, but one or more of these top dielectric layers and bottom dielectric layers are a plurality of layers. It can also be layered.

In addition, a black layer (not shown) may be further formed on the partition 212 to prevent reflection of the external light due to the partition 212.

In addition, a black layer (not shown) may be further formed at a specific position on the front substrate 201 corresponding to the partition 212.

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

As such, the structure of the plasma display panel according to the present invention may be variously changed.

Next, FIG. 3 is a diagram for describing an image frame for implementing gray levels of an image in a plasma display device according to an embodiment of the present invention.

4 is a view for explaining an example of the operation of the plasma display device according to an embodiment of the present invention.

First, referring to FIG. 3, an image frame for implementing gray levels of an image in a plasma display device according to an embodiment of the present invention may be divided into a plurality of subfields having different emission counts.

Although not illustrated, one or more subfields among the plurality of subfields may be grayed out according to a reset period for initializing all discharge cells, an address period for selecting discharge cells to be discharged, and the number of discharges. It can be divided into the sustain period (Sustain Period) that implements.

For example, when an image is to be displayed with 256 gray levels, one image frame is divided into eight subfields SF1 to SF8 as shown in FIG. 3, and eight subfields SF1 to SF8. Each can be subdivided into a reset period, an address period and a sustain period.

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

The plasma display apparatus according to an exemplary embodiment uses a plurality of image frames to implement an image, for example, to display an image of 1 second. For example, 60 image frames are used to display an image of 1 second. In this case, the length T of one image frame may be 1/60 second, that is, 16.67 ms.

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

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

Next, referring to FIG. 4, an example of an operation of a plasma display apparatus according to an exemplary embodiment of the present invention in any one of a plurality of subfields included in an image frame as shown in FIG. 3 is shown.

First, the first ramp-down signal may be supplied to the first electrode Y by the driver 110 of FIG. 1 in the pre-reset period before the reset period. It will be appreciated that the various signals to be described later are supplied to the first electrode, the second electrode, or the third electrode by the driver 110 of FIG. 1.

In addition, while the first falling ramp signal is supplied to the first electrode Y, a pre-sustain signal in a polarity opposite to the first falling ramp signal may be supplied to the second electrode Z.

Here, the first falling ramp signal supplied to the first electrode Y may gradually fall to the tenth voltage V10.

In addition, the pre-sustain signal can keep the pre-sustain voltage Vpz substantially constant. Here, the pre-sustain voltage Vpz may be a voltage of the sustain signal SUS supplied in a subsequent sustain period, that is, a voltage approximately equal to the sustain voltage Vs.

As such, when the first falling ramp signal is supplied to the first electrode Y and the presuspension signal is supplied to the second electrode Z in the pre-reset period, a wall of a predetermined polarity is formed on the first electrode Y. Wall charges are accumulated, and wall charges of opposite polarity to the first electrode Y are accumulated on the second electrode Z. For example, positive wall charges are accumulated on the first electrode Y, and negative wall charges are accumulated on the second electrode Z.

This makes it possible to generate a set-up discharge of sufficient intensity in the subsequent reset period, which in turn makes it possible to perform the initialization sufficiently stably.

In addition, even when the voltage of the rising ramp signal Ramp-Up supplied to the first electrode Y becomes smaller in the reset period, it is possible to generate the setup discharge of sufficient intensity.

From the viewpoint of securing the driving time, a pre-reset period is included before the reset period in the subfields arranged first in time among the subfields of the image frame, or before the reset period in two or three subfields of the subfields of the image frame. It is also possible to include a pre-reset period.

Alternatively, this pre-reset period may be omitted in all subfields.

After the pre-reset period, in a set-up period of a reset period for initialization, a ramp-up signal in a direction opposite to that of the first falling ramp signal may be supplied to the first electrode Y.

In this case, the rising ramp signal may gradually increase in voltage from the thirtieth voltage V30 to the fortieth voltage V40 with a predetermined slope.

In this setup period, a weak dark discharge, that is, setup discharge, occurs in the discharge cell by the rising ramp signal. This setup discharge causes a certain amount of wall charges to accumulate in the discharge cell.

In a set-down period after the set-up period, a second ramp-down signal in a direction opposite to that of the ramp ramp signal may be supplied to the first electrode Y after the ramp ramp signal.

Here, the second falling ramp signal may gradually fall from the 60th voltage V60 to the 50th voltage V50.

As a result, weak erase discharge, that is, set-down 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.

The rising ramp signal and the second falling ramp signal described above may be referred to as reset signals.

The falling signal is supplied to the first electrode Y between the rising ramp signal and the falling ramp signal, that is, the second falling ramp signal described above. This falling signal will be described in more detail later with reference to FIG. 6.

Meanwhile, in the address period after the reset period, a scan bias signal that substantially maintains a voltage higher than the 50 th voltage V50 of the second falling ramp signal may be supplied to the first electrode Y. FIG.

In addition, a scan signal Scan which decreases by the scan voltage ΔVy from the scan bias signal may be supplied to all of the first electrodes Y1 to Yn.

For example, the first scan signal Scan 1 is supplied to the first first electrode Y1 of the plurality of first electrodes Y, and then the second scan signal (2) is applied to the second first electrode Y2. Scan 2) is supplied, and the n-th scan signal Scan n is supplied to the n-th first electrode Yn.

On the other hand, the width of the scan signal in units of subfields may vary. That is, the width of the scan signal Scan in at least one subfield may be different from the width of the scan signal Scan in other subfields. For example, the width of the scan signal Scan in the subfield located later in time may be smaller than the width of the scan signal Scan in the subfield located earlier. In addition, the scan signal scan width decreases according to the arrangement order of the subfields gradually, such as 2.6 ms (microseconds), 2.3 ms (microseconds), 2.1 ms (microseconds), 1.9 ms (microseconds), and the like. Or 2.6 ㎲ (microseconds), 2.3 ㎲ (microseconds), 2.3 ㎲ (microseconds), 2.1 ㎲ (microseconds) ... 1.9 ㎲ (microseconds), 1.9 ㎲ (microseconds) It could be done.

As such, when the scan signal Scan is supplied to the first electrode Y, a data signal rising by the magnitude ΔVd of the data voltage may be supplied to the third electrode X to correspond to the scan signal.

As the scan signal Scan and the data signal Data are supplied, the voltage difference between the voltage of the scan signal and the data voltage Vd of the data signal and the wall voltage generated by the wall charges generated in the reset period are In addition, an address discharge is generated in the discharge cell to which the voltage Vd of the data signal is supplied.

Here, a sustain bias signal may be supplied to the second electrode Z to prevent address discharge from becoming unstable due to interference of the second electrode Z in the address period.

Here, the sustain bias signal may maintain a substantially constant sustain bias voltage Vz smaller than the voltage of the sustain signal supplied in the sustain period and greater than the voltage of the ground level GND.

Thereafter, the sustain signal SUS may be alternately supplied to the first electrode Y and / or the second electrode Z in the sustain period for displaying an image. The sustain signal SUS may have a magnitude of a voltage of ΔVs.

When the sustain signal SUS is supplied, the discharge cell selected by the address discharge is added to the first electrode when the wall voltage in the discharge cell and the sustain voltage Vs of the sustain signal SUS are added and the sustain signal SUS is supplied. A sustain discharge, that is, a display discharge, occurs between (Y) and the second electrode Z.

5 is a diagram for explaining another type of the sustain signal.

Referring to FIG. 5, a positive sustain signal and a negative sustain signal are alternately supplied to one of the first electrodes Y and the second electrode Z, for example, the first electrode. do.

As such, while a positive sustain signal and a negative sustain signal are supplied to any one electrode, a bias signal may be supplied to the other electrode, for example, the second electrode Z.

Here, the bias signal may maintain the voltage of the ground level GND substantially constant.

As shown in FIG. 5, when the sustain signal is supplied only to one of the first electrode Y and the second electrode Z, one of the first electrode Y and the second electrode Z may be used. Only one driving board in which circuits for supplying a sustain signal is arranged is required.

As a result, the overall size of the driving unit can be reduced, thereby reducing the manufacturing cost.

Next, FIG. 6 is a diagram for explaining the falling signal in more detail.

Referring to FIG. 6, the falling signal may be supplied to the first electrode between the rising ramp signal and the falling ramp signal. Here, the falling ramp signal may be the second falling ramp signal when the pre-reset period is included as in FIG. 4.

For example, the falling signal may fall between the rising ramp signal and the falling ramp signal with a steeper slope than the slope of the falling ramp signal from a voltage V30 lower than the maximum voltage V40 of the rising ramp signal.

The slope of the falling signal may be substantially the same as the slope of the sustain signal supplied to at least one of the first electrode and the second electrode in the sustain period after the reset period. The slope of the falling signal and the slope of the sustain signal will be described in more detail later with reference to FIG. 9.

Here, the lowest voltage V60 of the falling signal may be higher than the voltage of the ground level GND. As such, the reason why the lowest voltage V60 of the falling signal may be higher than the voltage of the ground level GND will be more clearly explained later.

As such, the reason for supplying the falling signal between the rising ramp signal and the falling ramp signal in the reset period will be described with reference to FIG. 7.

7 is a diagram for explaining the reason for supplying the falling signal.

Referring to FIG. 7, (a) shows an example in which the supply of the falling signal is omitted after the rising ramp signal and the falling ramp signal is supplied according to the prior art. For example, assume that the falling ramp signal gradually decreases the voltage from the thirtieth voltage V30 to the fifty voltage V50.

In this case, since the voltage width of the falling ramp signal, that is, the voltage width between the thirtieth voltage V30 and the sixtieth voltage V60 is relatively large, a relatively large noise at the time when the falling ramp signal is supplied as shown in (b) (Noise) may occur. Such noise may also occur due to an overload of the driving circuit that supplies the falling ramp signal.

Such noise may destabilize driving and may even cause electrical damage of the switching elements of the driving circuit.

On the other hand, when the falling signal is supplied to the first electrode in a period before the falling ramp signal is supplied after the rising ramp signal is supplied to the first electrode as in the exemplary embodiment of the present invention, the generation of noise can be reduced. have.

More specifically, since the falling signal falls from the thirtieth voltage V30 lower than the maximum voltage V40 of the rising ramp signal to the sixtieth voltage V60 higher than the lowest voltage V50 of the falling ramp signal, the width of the voltage is increased. Smaller than the falling ramp signal. Therefore, the generation of noise can be reduced as compared with FIG. 7 (b). Accordingly, electrical damage of the switching elements of the driving circuit can be prevented. Here, in order to reduce the width of the voltage of the falling signal to further reduce the generation of noise, the lowest voltage V60 of the falling signal may be set higher than the voltage of the ground level GND. Further, the length d of the supply period of the falling signal may be set to 5 ns (nanoseconds) or more and 1000 ns (nanoseconds) or less, and further, between the end time t0 of the rising ramp signal and the supply time t1 of the falling signal. The difference may be set to 530 ns (nanoseconds) or less.

Next, FIG. 8 is a diagram for explaining another form of the reset signal.

8, the rising ramp signal of the reset signal may include a first rising ramp signal and a second rising ramp signal.

For example, the first rising ramp signal rises with the first slope from the twentieth voltage V20 to the thirtieth voltage V30, and the second rising ramp signal goes from the thirtieth voltage V30 to the forty voltage V40. May rise to a second slope that is more gentle than the first slope.

As such, when the second slope of the second rising ramp signal is gentler than the first slope, the voltage rises relatively quickly until the setup discharge occurs, and the voltage rises relatively slowly while the setup discharge occurs. By acquiring the effect of making it make it possible to reduce the amount of light generated by the setup discharge. Accordingly, the contrast characteristic can be improved.

As described above, the reset signal may be changed in various forms.

9 is a view for explaining an example of the configuration of a drive unit of the plasma display device according to an embodiment of the present invention.

Referring to FIG. 9, the driving unit of the plasma display device according to the embodiment may include an energy recovery circuit.

The energy recovery circuit includes a voltage storage unit 900, a storage voltage supply unit 901, a voltage recovery unit 902, a sustain voltage supply unit 904, a base voltage supply unit 905, and an inductor unit 903. ) May be included.

The voltage storage unit 900 may include a voltage storage capacitor unit C, and may store a voltage using the energy storage capacitor unit C.

The storage voltage supply unit 901 includes a storage voltage supply control switch unit S1, and the voltage stored in the voltage storage unit 900 is stored in the first electrode of the plasma display panel using the storage voltage supply control switch unit S1. Alternatively, it may be supplied to the second electrode.

The voltage recovery unit 902 includes a voltage recovery control switch unit S2, and the reactive energy of the first electrode or the second electrode of the plasma display panel is converted into a voltage storage unit using the voltage recovery control switch unit S2. 900 may be recovered and stored.

The inductor unit 903 includes a resonance inductor L, and generates an LC resonance to which a voltage stored in the voltage storage unit 900 is supplied to the first electrode or the second electrode using the resonance inductor L. FIG. You can.

The sustain voltage supply unit 904 includes a sustain voltage supply control switch unit S3, and the sustain voltage source Vs generated by the sustain voltage source using the sustain voltage supply control switch unit S3 is the first electrode or the second electrode. It can be supplied to the electrode.

The base voltage supply unit 905 includes a base voltage supply control switch unit S4, and the base voltage GND generated by the base voltage source using the base voltage supply control switch unit S4 is the first electrode or the second electrode. It can be supplied to the electrode. That is, the first electrode or the second electrode can be grounded.

The operation of the driving unit of FIG. 9 will be described with reference to FIGS. 10 and 11.

10 is a view for explaining an example of the operation of the driving unit of FIG. 9 for supplying a sustain signal.

FIG. 11 is a view for explaining an example of the operation of the driving unit of FIG. 9 for supplying a falling signal.

First, referring to FIG. 10, first, the voltage recovery unit 902, the sustain voltage supply unit 904, and the base voltage supply unit 905 are turned off in the voltage rising period, and the storage voltage supply unit 901 is turned on. (On) can be.

Then, an energy supply path is formed through the voltage storage unit 900, the first node n1, the storage voltage supply unit 901, the second node n2, the inductor unit 903, and the third node n3. do. Accordingly, the voltage stored in the voltage storage unit 900 may be supplied to the first electrode or the second electrode through LC resonance by the resonance inductor L of the inductor 903.

Here, assuming that the voltage storage unit 900 stores a sustain voltage of 0.5 times, that is, a voltage of 1/2 Vs, the voltage of the first electrode or the second electrode rises up to the maximum sustain voltage Vs in the voltage rising period. can do.

Next, in the voltage sustain period, the sustain voltage supply control switch section S3 of the sustain voltage supply section 904 is turned on. Then, the sustain voltage Vs generated by the sustain voltage source is supplied to the first electrode or the second electrode via the third node n3.

Thus, the first electrode or the second electrode maintains the sustain voltage Vs substantially constant.

Next, in the voltage drop period, the voltage recovery unit 902 is performed with both the sustain voltage supply control switch unit S3 of the sustain voltage supply unit 904 and the storage voltage supply control switch unit S1 of the storage voltage supply unit 901 turned off. Voltage recovery control switch unit (S2) may be turned on.

Then, the first electrode or the second electrode, the third node n3, the inductor unit 903, the second node n2, the voltage recovery unit 902, the first node n1, the voltage storage unit 900 An energy recovery path through is formed. Then, the voltage of the first electrode or the second electrode may be recovered and stored in the voltage storage unit 900 through LC resonance by the inductor unit 903.

As a result, the voltage of the first electrode or the second electrode may drop from the sustain voltage Vs to the lowest base voltage GND.

Meanwhile, the base voltage supply control switch S4 of the base voltage supply unit 905 may be turned on in periods other than the voltage rising period, the voltage holding period, and the voltage falling period. Then, the first electrode or the second electrode can maintain the ground voltage GND.

The driving unit may supply the sustain signal to the first electrode or the second electrode by the method described above.

Hereinafter, an example of the operation of the driver for supplying the falling signal will be described.

Next, referring to FIG. 11, in the d1 period, the sustain voltage supply control switch S3 of the sustain voltage supply unit 904 is turned on as in the voltage sustain period of FIG. 10. Then, the sustain voltage Vs generated by the sustain voltage source is supplied to the first electrode via the third node n3.

As a result, the first electrode maintains the sustain voltage Vs substantially constant.

Next, in the d2 period, both the sustain voltage supply control switch unit S3 of the sustain voltage supply unit 904 and the storage voltage supply control switch unit S1 of the storage voltage supply unit 901 are all the same as in the voltage drop period of FIG. 10. In the off state, the voltage recovery control switch unit S2 of the voltage recovery unit 902 may be turned on.

Then, the energy passes through the first electrode, the third node n3, the inductor 903, the second node n2, the voltage recovery unit 902, the first node n1, and the voltage storage unit 900. A recovery path is formed. Then, the voltage of the first electrode or the second electrode may be recovered and stored in the voltage storage unit 900 through LC resonance by the inductor unit 903. That is, the falling signal is generated through the LC resonance as described above, and the falling signal thus generated is supplied to the first electrode.

In this manner, the falling signal can be supplied to the first electrode.

Comparing the case of FIG. 10 and FIG. 11, it can be seen that the switching operation in the voltage drop period of FIG. 10 and the d2 period of FIG. 11 are substantially the same. Accordingly, the slope of the voltage drop period of the sustain signal and the slope of the fall signal may be substantially the same.

In addition, since the lowest voltage of the falling signal is higher than the voltage of the ground level GND as described above, the length of the d2 period of FIG. 11 may be shorter than the length of the voltage falling period of FIG. 10.

That is, the length of the d2 period of FIG. 11 is shorter than the voltage drop period of the sustain signal so that the voltage of the first electrode is recovered and stored in the voltage storage unit 900 through LC resonance by the inductor unit 903 of FIG. 9. By shortening the length of the period, the lowest voltage of the falling signal can be higher than the voltage of the ground level (GND).

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 above-described embodiments are to be understood in all respects as illustrative and not restrictive, the scope of the present invention being indicated by the following claims rather than the foregoing description, and the meanings of the claims and All changes or modifications derived from the scope and the equivalent concept should be construed as being included in the scope of the present invention.

As described in detail above, the plasma display device according to the exemplary embodiment of the present invention reduces the occurrence of noise by supplying a falling signal falling sharper than the falling ramp signal between the rising ramp signal and the falling ramp signal to the first electrode. It is effective to suppress the electrical damage of the switching element of the drive circuit.

Claims (6)

A plasma display panel including a first electrode and a second electrode parallel to each other; A ramp-up signal and a ramp-down signal are supplied to the first electrode in a reset period during initialization, and the maximum of the ramp ramp signal is increased between the ramp ramp signal and the ramp ramp signal. A driver for supplying a falling signal falling to a slope steeper than a slope of the falling ramp signal from a voltage lower than a voltage to the first electrode. Plasma display device comprising a. The method of claim 1, And the slope of the falling signal is substantially the same as the slope of the sustain signal supplied to at least one of the first electrode and the second electrode in the sustain period after the reset period. The method of claim 1, And a supply period of the falling signal is 5 ns (nanoseconds) or more and 1000 ns (nanoseconds) or less. The method of claim 1, The lowest voltage of the falling signal is higher than the voltage of the ground level (GND) plasma display device. The method of claim 1, And a difference between the end of the rising ramp signal and the time of supplying the falling signal is 530 ns (nanosecond) or less. The method of claim 1, And the falling signal is generated through LC resonance.

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