KR20080046930A - Plasma display apparatus - Google Patents

Abstract

A plasma display apparatus is provided to improve the characteristics of contrast by rapidly increasing a voltage before set-up discharge and by slowly increasing the voltage during the set-up discharge. A plasma display apparatus includes a plasma display panel(100) and a driver(110). The plasma display panel includes address electrodes. The driver supplies data signals during an address period of a sub-field. The data signals include first and second data signals. The first and second data signals include voltage rising, voltage maintaining, and voltage falling intervals. A voltage is decreased to a specific voltage, which is higher than a minimum voltage in a voltage rising interval of the first data signal, during a voltage falling interval of the first data signal and gradually increased from the specific voltage by resonance through an inductor during a rising voltage interval of the second data signal.

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.

2 is a view for explaining the structure of a plasma display panel that can be included in the 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 an operation of a plasma display device according to an embodiment of the present invention in a subfield included in an image frame;

5A to 5B are diagrams for explaining another form of the rising ramp signal or the second falling ramp signal.

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

7 is a diagram for explaining an example of the configuration of a drive unit.

8A to 8E are views for explaining an example of the operation of the driving unit in Fig. 7.

9 is a diagram for explaining a case where two data signals are continuous;

FIG. 10 is a diagram for explaining the reason for setting as shown in FIG. 9 when two data signals are continuous. FIG.

FIG. 11 is a diagram for explaining another setting of the first data signal and the second data signal. FIG.

<Explanation of symbols 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 may include a plasma display panel having electrodes formed thereon, and a driving unit supplying driving signals to the electrodes of the plasma display panel.

In general, a phosphor layer is formed in a discharge cell formed by partition walls in a 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.

One embodiment of the present invention is to provide a plasma display apparatus which improves a method of supplying a data signal supplied to an address electrode in an address period of a subfield to prevent a decrease in driving efficiency and to stabilize an address discharge.

A plasma display apparatus according to an embodiment of the present invention for achieving the above object includes a plasma display panel including an address electrode, a driver for supplying a data signal to the address electrode in the address period of the subfield, the data signal A first data signal and a second data signal, wherein the first data signal and the second data signal each include a voltage rising period, a voltage holding period, and a voltage falling period, and the first data signal and the second data signal are continuous. In the voltage drop period of the first data signal, the voltage drops to a specific voltage that is higher than the lowest voltage in the voltage rise period of the first data signal, and in the voltage rise period of the second data signal, the voltage starts from the specific voltage. It gradually rises by resonance.

In addition, in the voltage rising period of the first data signal, the voltage gradually rises to the tenth voltage by resonance through the inductor unit, and in the voltage holding period, the 20th voltage larger than the tenth voltage is kept substantially constant, and the voltage drops down. In the period, the voltage gradually falls to the specific voltage smaller than the twentieth voltage, and in the voltage rising period of the second data signal, the voltage gradually rises from the specific voltage to the thirtieth voltage by resonance through the inductor portion, and the voltage holding period Maintain a substantially constant voltage greater than the thirtieth voltage, and the voltage gradually falls below the fortyth voltage in the voltage drop period.

Also, the tenth voltage is different from the thirtieth voltage.

Further, the tenth voltage is greater than the thirtieth voltage.

Further, the twentieth voltage is substantially the same as the fortieth voltage.

In addition, the specific voltage is 0.1 times or more and 0.7 times or less of the 20th voltage.

Moreover, the specific voltage is 0.25 times or more and 0.45 times or less of the 20th voltage.

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 plasma display panel 100 includes scan electrodes Y1 to Yn and sustain electrodes Z1 to Zn parallel to each other, and includes address electrodes X1 to Xm intersecting the scan electrode and the sustain electrode.

The driver 110 supplies a data signal to an address electrode of the plasma display panel 100 in an address period of a subfield.

Here, in FIG. 1, only the case in which the driving unit 110 is formed as one board is illustrated, but in the present invention, the driving unit 110 is divided into a plurality of boards 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

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

Next, FIG. 2 is a diagram for describing a structure of a plasma display panel that may be included in a plasma display device according to an embodiment of the present invention.

Referring to FIG. 2, a plasma display panel that may be included in a plasma display apparatus according to an embodiment of the present invention may include a front substrate 201 in which scan electrodes 202 and Y and sustain electrodes 203 and Z are parallel to each other. The back substrate 111 on which the address electrodes 213 and X intersect the scan electrodes 202 and Y and the sustain electrodes 203 and Z described above are bonded to each other.

The front substrate 201 on which the scan electrodes 202 and Y and the sustain electrodes 203 and Z are formed has a dielectric layer such as an upper dielectric layer 204 to cover the scan electrodes 202 and Y and the sustain electrodes 203 and Z. ) May be formed.

The upper dielectric layer 204 limits the discharge current of the scan electrodes 202 and Y and the sustain electrodes 203 and Z and may insulate between the scan electrodes 202 and Y and 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 magnesium oxide (MgO) material. The protective layer 205 may be formed, for example, by depositing a magnesium oxide (MgO) material over the upper dielectric layer 204.

Meanwhile, electrodes, for example, address electrodes 213 and X are formed on the rear substrate 211, and the address electrodes 213 and X are covered on the rear substrate 211 on which the address electrodes 213 and X are formed. Dielectric layer, such as lower dielectric layer 215 may be formed.

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

On top of the lower dielectric layer 215, a partition 112, 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, red (R), green (G), and blue (B) discharge cells may be formed between the front substrate 101 and the rear substrate 111.

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.

Meanwhile, although the widths of the red (R), green (G), and blue (B) discharge cells in the plasma display panel that can be applied to the plasma display device according to an embodiment of the present invention may be substantially the same, red ( The width of at least one of the R), green (G), and blue (B) discharge cells may be different from that of the other discharge cells.

For example, the width of the red (R) discharge cell is the smallest, and the width of the green (G) and blue (B) discharge cells can be made larger than the width of the red (R) discharge cell.

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

As such, when formed, the width of the phosphor layer 214 to be described later formed in the discharge cell is also changed in relation to the width of the discharge cell. For example, the width of the blue (B) phosphor layer formed in the blue (B) discharge cell is wider than the width of the red (R) phosphor layer formed in the red (R) discharge cell, and at the same time in the green (G) discharge cell. The width of the green (G) phosphor layer formed may be wider than the width of the red (R) phosphor layer formed in the red (R) discharge cell.

Then, color temperature characteristics of the image to be implemented may be improved.

In addition, the plasma display panel that can be applied to the plasma display apparatus according to an exemplary embodiment of the present invention may have not only the structure of the partition 212 illustrated in FIG. 2 but also the structure of the partition 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.

In the case of the differential partition wall structure, the height of the first partition wall 212b may be lower than the height of the second partition wall 212a. In addition, in the case of the channel-type partition wall structure, a channel may be formed in the first partition wall 212b.

On the other hand, in the plasma display panel applicable to the plasma display device according to an embodiment of the present invention, although the red (R), green (G), and blue (B) discharge cells are illustrated and described as being arranged on the same line, It may be possible to arrange them in other shapes. 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.

In addition, in FIG. 2, only the case where the barrier rib 212 is formed on the rear substrate 211 is illustrated, but the barrier rib 212 may be formed on at least one of the front substrate 201 and the rear substrate 211.

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 thickness of the phosphor layer 214 in at least one of the red (R), green (G), and blue (B) discharge cells may be different from other discharge cells. For example, the phosphor layer of a green (G) discharge cell, ie the phosphor layer in the green (G) phosphor layer or the blue (B) discharge cell, ie the thickness of the blue (B) phosphor layer, is a red (R) discharge cell. It may be thicker than the thickness of the phosphor layer in, ie the red (R) phosphor layer. Here, the thickness of the green (G) phosphor layer may be substantially the same as or different from the thickness of the blue (B) phosphor layer.

Meanwhile, only the example of the plasma display panel which can be applied to the plasma display apparatus according to the exemplary embodiment of the present invention is shown 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, another black layer (not shown) may be further formed on the top of the partition 212 to prevent reflection of the external light due to the partition 212.

In addition, another 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 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.

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

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 shown, one or more subfields among the plurality of subfields may be grayed out according to a reset period for initializing 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 to implement.

For example, when an image is to be displayed with 256 gray scales, for example, one image frame is divided into eight subfields SF1 to SF8 as shown in FIG. 3, and each of the eight subfields SF1 to SF8, respectively. 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 such, by adjusting the number of sustain signals supplied in the sustain period of each subfield according to the gray scale weight in each subfield, gray levels of various images are realized.

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 constituting one image frame may be variously changed. For example, one video frame may be configured with 12 subfields from the first subfield to the twelfth subfield, or one video frame may be configured with 10 subfields.

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

Next, FIG. 4 is a view for explaining an example of an operation of the plasma display apparatus according to an embodiment of the present invention in a subfield included in an image frame. It will be appreciated that the driving signals to be described below are supplied by the driving unit 110 of FIG. 1.

Referring to FIG. 4, first, a first ramp-down signal may be supplied to the scan electrode Y in a pre-reset period before the reset period.

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

Here, the first falling ramp signal supplied to the scan electrode Y may gradually fall to the first voltage V1.

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 scan electrode Y in the pre-reset period and the pre-sustain signal is supplied to the sustain electrode Z, the wall charge Wall having a predetermined polarity on the scan electrode Y is provided. Charge) is accumulated, and wall charges of opposite polarity to the scan electrode (Y) are accumulated on the sustain electrode (Z). For example, a positive wall charge may be accumulated on the scan electrode Y, and a negative wall charge may be accumulated on the sustain 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 scan 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 the set-up period of the reset period for initialization, the ramp-up signal in a direction opposite to the first falling ramp signal may be supplied to the scan electrode Y.

Here, the rising ramp signal may be a first rising ramp signal gradually increasing with the first slope from the second voltage V2 to the third voltage V3 and a second voltage from the third voltage V3 to the fourth voltage V4. It may include a second rising ramp signal rising to the slope.

In this setup period, a weak dark discharge, that is, setup discharge, occurs in the discharge cell by the rising ramp signal. By this setup discharge, some wall charges can be accumulated in the discharge cells.

Here, the second slope of the second rising ramp signal may be gentler than the first slope. As such, when the second slope is made gentler than the first slope, the voltage is increased relatively quickly until the setup discharge occurs, and the voltage is increased relatively slowly while the setup discharge occurs. The amount of light generated by the setup discharge can be reduced.

Accordingly, the contrast characteristic can be improved.

In the set-down period after the set-up period, the second ramp-down signal in the opposite polarity direction to the scan ramp Y may be supplied to the scan electrode Y after the ramp ramp signal.

Here, the second falling ramp signal may gradually fall from the fifth voltage V5 to the sixth voltage V6.

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 in the discharge cells remain uniformly.

Next, FIGS. 5A to 5B are diagrams for describing another form of the rising ramp signal or the second falling ramp signal.

First, referring to FIG. 5A, the rising ramp signal gradually rises from the third voltage V3 to the fourth voltage V4 after rapidly rising from the second voltage V2 to the third voltage V3.

As such, the rising ramp signal may rise gradually with different inclinations over two stages, as shown in FIG. 4, and in various forms, such as gradually rising in one stage as shown here in FIG. 5A. It is possible to change.

Next, referring to FIG. 5B, the second falling ramp signal has a form in which the voltage gradually falls from the eighth voltage V8. Here, the eighth voltage V8 may be substantially the same as or different from the third voltage V3.

As described above, the second falling ramp signal may be changed in various forms, such as a different point in time at which the voltage falls.

Meanwhile, in the address period after the reset period, a scan bias signal that substantially maintains the lowest voltage of the second falling ramp signal, that is, a voltage higher than the sixth voltage V6 may be supplied to the scan electrode Y.

In addition, the scan signal Scan, which is lowered by the scan voltage qVy from the scan bias signal, may be supplied to the scan electrodes Y1 to 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 scan electrode Y, the data signal may be supplied to the address electrode X corresponding to the scan signal. The data signal may include a voltage rising period, a voltage holding period, and a voltage falling period.

This data signal will be described in more detail later with reference to FIG. 6.

As the scan signal and the data signal are supplied, the difference between the voltage of the scan signal and the voltage of the data signal and the wall voltage generated by the wall charges generated in the reset period are added to the data signal. An address discharge may be generated in the discharge cells supplied.

Here, the sustain bias signal may be supplied to the sustain electrode Z in order to prevent the address discharge from becoming unstable due to the interference of the sustain 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 supplied to at least one of the scan electrode Y and the sustain electrode Z in the sustain period for displaying an image. For example, the sustain signal SUS may be alternately supplied to the scan electrode Y and the sustain electrode Z.

When the sustain signal SUS 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 SUS, and the scan electrode SUS is supplied when the sustain signal SUS is supplied. A sustain discharge, that is, a display discharge, may be generated between Y) and the sustain electrode Z.

Through this process, an image may be displayed.

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

Referring to FIG. 6, a data signal supplied to an address electrode in an address period includes a voltage rising period, a voltage sustain period, and a voltage falling period.

In the voltage rising period, the voltage of the data signal gradually rises to the tenth voltage V10 due to the resonance through the inductor unit. The length of this voltage rise period is approximately 100 ns or more and 380 ns or less.

In the voltage sustain period, the twentieth voltage V20 at which the voltage of the data signal is greater than the tenth voltage V10 is maintained substantially constant. The length of this voltage holding period is approximately 570 ns or more and 780 ns or less.

In the voltage falling period, the voltage of the data signal gradually decreases below the twentieth voltage V20. The length of this voltage drop period is approximately 130ns or more and 300ns or less.

The total length of the data signal including the voltage rising period, the voltage holding period, and the voltage falling period is about 900ns or more and 1400ns or less.

The configuration of the driver for supplying the data signal and an example of its operation will be described with reference to FIGS. 7 and 8A to 8E.

It is a figure for demonstrating an example of the structure of a drive part.

8A to 8E are diagrams for explaining an example of the operation of the driving unit of FIG. 7.

First, referring to FIG. 7, the driving unit includes a data drive integrated circuit 700, a data voltage supplying unit 710, and an energy recovery unit 720.

The data voltage supply unit 710 includes a third switch unit S3, and through the switching operation of the third switch unit S3, the data voltage supply unit 710 outputs a twentieth voltage V20 output from a data voltage source (not shown). Supply to the data drive integrated circuit unit 700.

The data drive integrated circuit unit 700 is connected to the address electrode X of the plasma display panel and supplies the voltage supplied thereto to the address electrode X through a predetermined switching operation. For example, the output of the data voltage supply unit 710, the output of the energy recovery unit 720, and the voltage of the ground level GND are selectively supplied to the address electrode X.

In addition, the data drive integrated circuit unit 700 includes a first switch unit S1 and a second switch unit S2.

Here, one end of the first switch unit S1 is commonly connected to the data voltage supply unit 710 and the energy recovery unit 720, and the other end is connected to one end of the second switch unit S2. In addition, the other end of the second switch unit S2 is grounded (GND).

In addition, between the other end of the first switch portion S1 and one end of the second switch portion S2, that is, the second node n2 is connected to the address electrode X.

The data drive integrated circuit unit 700 may be formed as a module independently of the data voltage supply unit 710 and the energy recovery unit 720. For example, it is formed in the form of one chip on a flexible substrate such as a tape carrier package (TCP).

The energy recovery unit 720 includes a capacitor unit C, an inductor unit L, and a fourth switch unit S4. The capacitor portion C, the inductor portion L, and the fourth switch portion S4 are arranged in series.

The capacitor unit C stores the energy to be supplied to the address electrode X of the plasma display panel, and also stores the reactive energy recovered from the address electrode X of the plasma display panel.

The fourth switch S4 forms a supply path of energy supplied from the capacitor C to the address electrode X of the plasma display panel. In addition, a recovery path for energy recovered from the address electrode X of the plasma display panel to the energy storage capacitor unit C is formed.

The inductor portion L allows the energy stored in the capacitor portion C to be supplied to the address electrode X of the plasma display panel through LC resonance, and the reactive energy of the plasma display panel is supplied through the LC resonance to the capacitor portion C. To be recovered.

Here, one end of the fourth switch unit S4 is connected to the other end of the capacitor unit C, and the other end is grounded. One end of the capacitor portion C is connected to the other end of the inductor portion L, and one end of the inductor portion L is formed of the data voltage supplying portion 710 and the data drive integrated circuit portion 700 at the first node n1. 1 is commonly connected to one end of the switch unit S1.

On the other hand, the driving unit may further include a current blocking unit 730. The current blocking unit 730 includes a diode unit D that can block a current flow between the capacitor unit C of the energy recovery unit 720 and a data voltage source (not shown). The current blocking unit 730 may block the output of the data voltage source, that is, the twentieth voltage V20 from flowing into the capacitor unit C.

The operation of the driving unit illustrated in FIG. 7 will be described with reference to FIGS. 8A to 8E.

First, referring to FIG. 8A, as shown in FIG. 6, switching timing of the driver of FIG. 7 for supplying a data signal having a rising period, a sustaining period, and a rising period to the address electrode X is shown.

In the voltage rising period, that is, the period d1, the fourth switch unit S4 of the energy recovery unit 720 is in an on state, and the first switch unit S1 of the data drive integrated circuit unit 700 is in an on state. .

In addition, the third switch unit S3 of the data voltage supply unit 710 and the second switch unit S2 of the data drive integrated circuit unit 700 are in an off state.

Then, as shown in FIG. 8B, the energy stored in the capacitor unit C of the energy recovery unit 720 is transferred to the third node n3, the inductor unit L, the first node n1, and the data drive integrated circuit unit 700. The first switch unit S1 is supplied to the address electrode X of the plasma display panel.

Here, resonance occurs due to the inductor part L, which causes the voltage of the address electrode X to gradually increase to the tenth voltage V10.

Subsequently, in the voltage sustain period, that is, d2, the third switch unit S3 of the data voltage supply unit 710 and the first switch unit S1 of the data drive integrated circuit unit 700 are turned on and the energy recovery unit 720 is turned on. The fourth switch unit S4, the energy recovery control switch unit Q3 and the second switch unit S2 of the data drive integrated circuit unit 700 are each in an off state.

Then, as illustrated in FIG. 8C, the twentieth voltage V20 supplied by the data voltage source passes through the first node n1 through the third switch unit S3 of the data voltage supply unit 710 and passes through the data drive integrated circuit unit ( The first switch unit S1 of 700 is supplied to the address electrode X of the plasma display panel. Accordingly, the voltage of the address electrode X, that is, the voltage of the data signal rises from the tenth voltage V10 to the twentieth voltage V20. That is, the data signal is clamped to the twentieth voltage V20 when the voltage is the tenth voltage V10.

On the other hand, in the voltage drop period, that is, the period d3, the fourth switch unit S4 of the energy recovery unit 720 is turned on, and the first switch unit S1 of the data drive integrated circuit unit 700 is turned on.

In addition, the third switch unit S3 of the data voltage supply unit 710 and the second switch unit S2 of the data drive integrated circuit unit 700 are in an off state, respectively.

Then, as shown in FIG. 8D, the reactive energy of the plasma display panel passes through the first switch unit S1, the first node n1, and the inductor unit L of the data drive integrated circuit unit 700. Is recovered.

At this time, LC resonance occurs through the inductor part L, and accordingly, the voltage of the address electrode X, that is, the voltage of the data signal gradually decreases below the twentieth voltage V20.

After the voltage drop period, as shown in FIG. 8E, the second switch unit S2 of the data drive integrated circuit unit 700 is turned on, and the third switch unit S3 and the energy recovery unit of the data voltage supply unit 710 are turned on. The fourth switch unit S4 of 720 and the first switch unit S1 of the data drive integrated circuit unit 700 are in an off state, respectively.

Then, the ground (GND) level voltage is supplied to the address electrode (X) of the plasma display panel through the second switch unit (S2) of the data drive integrated circuit unit 700.

Through this process, the data signal is supplied to the address electrode X.

Meanwhile, the case where two data signals are continuous will be described as follows.

9 is a diagram for explaining a case where two data signals are continuous.

As shown in FIG. 9, it is assumed that a data signal includes a first data signal data 1 and a second data signal data 2.

The first data signal data 1 and the second data signal data 2 may each include a voltage rising period, a voltage sustain period, and a voltage falling period.

Here, when the first data signal data 1 and the second data signal data 2 are continuous, the voltage rises in the voltage drop period of the first data signal data 1 in the voltage drop period of the first data signal data 1. The voltage drops to a specific voltage Vx higher than the lowest voltage in the period, for example, the ground level GND. In addition, in the voltage rising period of the second data signal data 2, the voltage gradually increases due to resonance through the inductor from the specific voltage Vx.

In more detail, when the first data signal data 1 and the second data signal data 2 are continuous, in the voltage rise period of the first data signal data 1, the voltage becomes a tenth voltage due to resonance through the inductor. Gradually rises to V10, and maintains a substantially constant twentieth voltage V20 greater than the tenth voltage V10 in the voltage sustain period, and a specific voltage whose voltage is less than the twentieth voltage V20 in the voltage fall period. Gradually descends to (Vx).

In addition, in the voltage rising period of the second data signal data 2, the voltage gradually rises from the specific voltage Vx to the thirtieth voltage V30 due to resonance through the inductor unit, and in the voltage holding period, the thirtieth voltage V30 is maintained. The 40th voltage V40 greater than) is maintained substantially constant, and the voltage gradually falls below the 40th voltage V40 in the voltage drop period. Here, the twentieth voltage V20 may be substantially the same as the forty th voltage V40. In addition, the tenth voltage V10 may be the same as the thirtieth voltage V30.

Looking at the attached Figure 10 for the reason for setting as described above are as follows.

FIG. 10 is a diagram for explaining a reason for setting as shown in FIG. 9 when two data signals are continuous.

Unlike FIG. 10, when the first data signal data 1 and the second data signal data 2 are continuous, the voltage drop period and the second voltage drop period of the first data signal data 1 are continuous. If the voltage rising period of the data signal data 2 is omitted and the voltage holding period of the first data signal data 1 and the voltage holding period of the second data signal data 2 are set to be continuous, the first data signal ( The energy recovery operation as shown in FIG. 8D previously performed in the voltage drop period of data 1) is omitted once. As a result, the driving efficiency is lowered by lowering the energy recovery efficiency.

In addition, in the case where three or more data signals are continuous, the number of times of the energy recovery operation that is omitted is further increased, thereby further lowering the driving efficiency.

On the other hand, when the first data signal data 1 and the second data signal data 2 are continuous as shown in FIG. 9, the energy recovery operation shown in FIG. 8D and the energy supply operation shown in FIG. 8B are performed. It is carried out continuously.

That is, even when the first data signal data 1 and the second data signal data 2 are continuous, the energy recovery operation as shown in FIG. 8D is performed in the voltage drop period of the first data signal data 1. As a result, the energy recovery efficiency can be prevented from being lowered and the driving efficiency can be sufficiently secured.

On the other hand, when the magnitude of the specific voltage Vx is excessively large, the voltage drop period of the first data signal data 1 when the first data signal data 1 and the second data signal data 2 are continuous. By excessively shortening the length, the energy recovery efficiency may be lowered.

On the other hand, when the magnitude of the specific voltage Vx is excessively small, the time required to sufficiently increase the voltage of the second data signal data 2 after the first data signal data 1 may increase excessively. have. As a result, the driving efficiency may be lowered, and the driving time may be insufficient.

In view of the above, the specific voltage Vx may be 0.1 times or more and 0.7 times or less than 0.25 times or 0.45 times or less of the twentieth voltage Vx.

Next, FIG. 11 is a diagram for explaining another setting of the first data signal and the second data signal.

Referring to FIG. 11, the tenth voltage V10 of the first data signal data 1 and the thirtieth voltage V30 of the second data signal data 2 are described as being identical to each other. V10 may be different from the thirtieth voltage V30.

More specifically, the energy recovery operation in the voltage period of the first data signal data 1 and the energy supply operation in the voltage rise period of the second data signal data 2 are continuous, and the first data signal data 1 is performed. In consideration of reducing the time required to raise the voltage of the second data signal data 2 to a sufficient point afterwards, it may be advantageous to set the tenth voltage V10 to be larger than the thirtieth voltage V30. have.

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

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

As described above in detail, in the plasma display device according to an embodiment of the present invention, when two data signals are continuous, the voltage is up to a specific voltage higher than the voltage of the ground level GND in the voltage drop period of the first data signal. After the fall, the drive voltage is gradually increased by resonance through the inductor from a specific voltage in the voltage rising period of the second data signal, thereby improving driving efficiency.

Claims (7)

A plasma display panel including an address electrode, A driver supplying a data signal to the address electrode in an address period of a subfield Including, The data signal comprises a first data signal and a second data signal, The first data signal and the second data signal each include a voltage rising period, a voltage sustain period, and a voltage falling period, In the case where the first data signal and the second data signal are continuous, in the voltage drop period of the first data signal, the voltage drops to a specific voltage higher than the lowest voltage in the voltage rise period of the first data signal, 2. The plasma display apparatus of claim 2, wherein the voltage gradually increases due to resonance through the inductor from the specific voltage in the voltage rising period of the data signal. The method of claim 1, In the voltage rising period of the first data signal, the voltage gradually rises to the tenth voltage by resonance through the inductor unit, and in the voltage holding period, the twentieth voltage larger than the tenth voltage is kept substantially constant, and the voltage In the falling period, the voltage gradually falls to the specific voltage smaller than the twentieth voltage, In the voltage rising period of the second data signal, the voltage gradually rises from the specific voltage to the thirtieth voltage by resonance through the inductor unit, and in the voltage holding period, the forty-th voltage higher than the thirtieth voltage is substantially constant. And the voltage gradually drops below the fortyth voltage in the voltage drop period. The method of claim 2, And the tenth voltage is different from the thirtieth voltage. The method of claim 3, wherein And the tenth voltage is greater than the thirtieth voltage. The method of claim 2, And the twentieth voltage is substantially the same as the forty th voltage. The method of claim 1, And the specific voltage is 0.1 to 0.7 times the twentieth voltage. The method of claim 6, And the specific voltage is 0.25 to 0.45 times the twentieth voltage.

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