KR100784755B1 - Plasma Display Apparatus - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display device, wherein a scan rising signal is supplied to the scan electrode (Y), and the sustain rising signal (Z) is supplied while the scan rising signal is supplied to the scan electrode (Y). ), There is an effect of reducing the occurrence of noise and electromagnetic interference (EMI).

The plasma display apparatus of the present invention includes a plasma display panel in which scan electrodes and sustain electrodes are formed, and a scan rising signal in which a voltage gradually rises before supplying a first scan signal in an address period for addressing. While the scan driver and the scan rising signal are supplied to the scan electrode, the voltage rises to the first slope from the first voltage to the second voltage, and the first slope from the second voltage to the third voltage It is preferable to include a sustain driver which rises to another second slope and supplies a sustain rising signal rising to a third slope different from the second slope from the third voltage to the fourth voltage to the sustain electrode.

Description

Plasma Display Apparatus {Plasma Display Apparatus}

BRIEF DESCRIPTION OF DRAWINGS Fig. 1 is a diagram for explaining the configuration of a plasma display device of the present invention.

2A to 2B are views for explaining an example of the structure of a plasma display device included in the plasma display device of the present invention.

FIG. 3 is a diagram for explaining a frame for implementing grayscale of an image in the plasma display device of the present invention; FIG.

4 is a view for explaining an example of the operation of the plasma display device of the present invention;

5 is a diagram for explaining a scan rise signal and a sustain rise signal in more detail.

6A to 6B are views for explaining the effect when the sustain rising signal is supplied to the sustain electrode Z when the scan rising signal is supplied to the scan electrode.

7 is a view for explaining an example of implementing a sustain driver of the plasma display device of the present invention;

8A to 8B are views for explaining an example of the operation of the sustain driver of the plasma display device of the present invention of FIG.

FIG. 9 is a diagram for explaining an example of a method of changing a length of a sustain rising signal in consideration of gray scale weights of a subfield; FIG.

<Explanation of symbols for main parts of the drawings>

100: plasma display panel 101: data driver

102: scan driver 103: sustain 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 a plasma display panel, a phosphor layer is formed in a discharge cell divided by a partition wall, and a plurality of electrodes, for example, a scan electrode Y, a sustain electrode Z, and an address electrode X are formed. Is formed.

The driving unit applies a driving signal to the discharge cell through the electrode.

Then, the discharge is generated by the driving voltage applied in the discharge cell. Here, when discharged by the driving voltage 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.

In the conventional plasma display apparatus which displays an image on the screen in this manner, the driving voltage for generating the discharge changes rapidly. In more detail, the driving voltage rises or falls rapidly. Accordingly, there is a problem that noise and electromagnetic interference (EMI) are relatively generated at a time when the driving voltage rises or falls.

As a result, problems such as unstable driving of the plasma display apparatus occur.

In order to solve the above problems, an object of the present invention is to provide a plasma display device in which the occurrence of noise and electromagnetic interference is reduced.

The plasma display device of the present invention for achieving the above object is a plasma display panel in which a scan electrode and a sustain electrode are formed, and a scan in which the voltage gradually rises before supplying the first scan signal in an address period for addressing. The voltage is increased at a first slope from a first voltage to a second voltage while the scan driver for supplying a rising signal to the scan electrode and the scan rising signal are supplied to the scan electrode, and the voltage is increased from the second voltage to the third voltage. A sustain driver configured to rise to a second slope different from the first slope and to supply the sustain rise signal to the sustain electrode from the third voltage to the fourth voltage at a third slope different from the second slope; It is preferable.

The sustain rising signal may be supplied to the sustain electrode before the scan signal is supplied to the scan electrode.

In addition, the period of rising from the first voltage to the second voltage is characterized in that 50ns (nanoseconds) or 250ns (nanoseconds) or less.

In addition, the period of rising from the first voltage to the second voltage is characterized in that approximately 100ns (nanoseconds).

In addition, the period of increasing from the second voltage to the third voltage is characterized in that more than 250ns (nanoseconds) and less than 550ns (nanoseconds).

In addition, the period of increasing from the second voltage to the third voltage is characterized in that approximately 400ns (nanoseconds).

In addition, the period of increasing from the third voltage to the fourth voltage is characterized in that more than 50ns (nanoseconds) or less than 250ns (nanoseconds).

In addition, the period of rising from the first voltage to the second voltage is characterized in that approximately 100ns (nanoseconds).

The second slope may be approximately equal to the rising slope of the sustain pulse supplied to the scan electrode and / or the sustain electrode in the sustain period after the address period.

The sustain driver may include a voltage storage unit for storing a voltage, a storage voltage supply unit for supplying a voltage stored in the voltage storage unit to the sustain electrode, and a voltage for recovering and storing the voltage of the sustain electrode in the voltage storage unit. A resonator for generating resonance when a voltage stored in the voltage storage unit is supplied to the sustain electrode and a voltage stored in the voltage storage unit; and a sustain voltage for supplying the sustain voltage to the sustain electrode. And a sustain voltage supply unit, a base voltage supply unit for supplying a base voltage to the sustain electrode, and a sustain bias voltage supply unit for supplying the fourth voltage to the sustain electrode.

The storage voltage supply unit, the voltage recovery unit, the sustain voltage supply unit, the base voltage supply unit, and the voltage storage unit during the period of rising from the first voltage to the second voltage and the rising of the third voltage to the fourth voltage. The sustain bias voltage supply is characterized in that all off (Off).

The voltage recovery unit, the sustain voltage supply unit, the base voltage supply unit, and the sustain bias voltage supply unit are all turned off during the period of rising from the second voltage to the third voltage, and the storage voltage supply unit It is characterized in that (On).

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

1 is a view for explaining the configuration of the plasma display device of the present invention.

Referring to FIG. 1, the plasma display apparatus of the present invention includes a plasma display panel 100, a scan driver 102, and a sustain driver 103. In addition, the plasma display device of the present invention preferably further includes a data driver 101.

In FIG. 1, the scan driver 102, the sustain driver 103, and the data driver 101 are separately formed, but at least one of the scan driver 102, the sustain driver 103, and the data driver 101 is provided. Two or more may be combined into one.

The data driver 101 drives the address electrode X through a method of supplying a data signal to the address electrode X of the plasma display panel 100.

The scan driver 102 supplies a ramp-up signal, a ramp-down signal, a scan ramp signal, a scan signal, and a sustain signal to the scan electrode Y of the plasma display panel 100. The scan electrode Y is driven by a method or the like.

The sustain driver 103 drives the sustain electrode Z through a method of supplying a sustain rising signal, a sustain bias signal Vzb, a sustain signal, and the like to the sustain electrode Z of the plasma display panel 100.

In particular, the scan driver 102 supplies the scan electrode Y with a scan rising signal in which the voltage gradually rises before the first scan signal is supplied in the address period for addressing.

In addition, the sustain driver 103 supplies the sustain rise signal while the scan rise signal is supplied to the scan electrode Y, that is, while the scan driver 102 supplies the scan rise signal to the scan electrode Y. Z).

The scan driver 102 and the sustain driver 103, which are the main features of the plasma display device of the present invention, will be clarified through the following description.

In the plasma display panel 100, a scan electrode Y and a sustain electrode Z are formed, and the scan electrode Y and the sustain electrode Z are formed to be parallel to each other.

An example of the structure of the 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 the structure of the plasma display device included in the plasma display device of the present invention.

First, referring to FIG. 2A, a plasma display panel according to the present invention includes a front panel 201 including an electrode, preferably a front substrate 201 on which scan electrodes 202 and Y and sustain electrodes 203 and Z are formed. A rear panel including a back substrate 211 on which an electrode intersecting the scan electrodes 202 and Y and the sustain electrodes 203 and Z, preferably the address electrodes 213 and X, is formed. 210 is made of a combination.

Here, the electrodes formed on the front substrate 201, preferably the scan electrodes 202 and Y and the sustain electrodes 203 and Z, generate a discharge in a discharge space, that is, a discharge cell, and at the same time Maintain the discharge.

The dielectric layer, preferably on top of the front substrate 201 on which the scan electrodes 202 and Y and the sustain electrodes 203 and Z are formed, covers the scan electrodes 202 and Y and the sustain electrodes 203 and Z. Top dielectric layer 204 is formed.

This upper dielectric layer 204 limits the discharge current of the scan electrodes 202 and Y and the sustain electrodes 203 and Z and insulates the scan electrodes 202 and Y from the sustain electrodes 203 and Z.

A protective layer 205 is formed on the top surface of the upper dielectric layer 204 to facilitate discharge conditions. The protective layer 205 is formed by, for example, depositing a material such as magnesium oxide (MgO) over the upper dielectric layer 204.

Meanwhile, the electrodes formed on the rear substrate 211, preferably the address electrodes 213 and X, are electrodes that supply a data signal to the discharge cells.

A dielectric layer, preferably a lower dielectric layer 215 is formed on the rear substrate 211 on which the address electrodes 213 and X are formed to cover the address electrodes 213 and X.

This lower dielectric layer 215 insulates the address electrodes 213, X.

A discharge space, that is, a partition 212, such as a stripe type or a well type, is formed on the lower dielectric layer 215 to partition the discharge cells. Accordingly, discharge cells such as red (R), green (G), and blue (B) are formed between the front substrate 201 and the rear substrate 211.

Here, a predetermined discharge gas is filled in the discharge cell partitioned by the partition wall 212.

In addition, a phosphor layer 214 is formed in a discharge cell partitioned by the partition 212 to emit visible light for image display during address discharge. For example, red (R), green (G), and blue (B) phosphor layers may be formed.

In the plasma display panel of the present invention described above, when the driving signal is supplied to at least one of the scan electrodes 202, Y, the sustain electrodes 203, Z, and the address electrodes 213, X, the barrier rib 212 is provided. Discharges occur within the discharge cells partitioned by each other.

Then, vacuum ultraviolet rays are generated in the discharge gas filled in the discharge cells, and the vacuum ultraviolet rays are applied to the phosphor layer 214 formed in the discharge cells. Then, a predetermined visible light is generated in the phosphor layer 214, and the visible light is emitted to the outside through the front substrate 201 in which the upper dielectric layer 204 is formed. A predetermined image is displayed on the outer surface.

Meanwhile, in the description of FIG. 2A, only the case where the scan electrodes 202 and Y and the sustain electrodes 203 and Z are each formed of one layer is illustrated and described. However, the scan electrodes 202 and Y or the It is also possible that at least one of the sustain electrodes 203 and Z consists of a plurality of layers. This will be described with reference to FIG. 2B.

Referring to FIG. 2B, the scan electrodes 202 and Y and the sustain electrodes 203 and Z may be formed of two layers, respectively.

In particular, in consideration of light transmittance and electrical conductivity, the scan electrodes 202 and Y and the sustain electrodes 203 and Z are opaque 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 and transparent electrodes 202a and 203a made of transparent indium tin oxide (ITO).

As such, the reason why the scan electrodes 202 and Y and the sustain electrodes 203 and Z include the transparent electrodes 202a and 203a is that when visible light generated in the discharge cells is emitted to the outside of the plasma display panel. To be released effectively.

In addition, the reason why the scan electrodes 202 and Y and the sustain electrodes 203 and Z include the bus electrodes 202b and 203b is that the scan electrodes 202 and Y and the sustain electrodes 203 and Z are transparent electrodes. In the case of including only 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 transparent electrodes 202a and 203a can cause such a reduction in the driving efficiency. To compensate for the low electrical conductivity.

2A to 2B, only one example of the plasma display panel of the present invention is shown and described, and it is to be understood that the present invention is not limited to the plasma display panel having the structure as shown in FIGS. 2A to 2B. For example, the plasma display panel of FIGS. 2A to 2B shows only the case where the upper dielectric layer 204 and the lower dielectric layer 215 are each one layer, but the upper dielectric layer 204 and At least one or more of the lower dielectric layers 215 may be formed of a plurality of layers.

An example of the operation of the plasma display apparatus of the present invention including the plasma display panel will be described with reference to FIGS. 3 to 4.

FIG. 3 is a diagram for explaining a frame for implementing gray levels of an image in the plasma display apparatus of the present invention.

4 is a view for explaining an example of the operation of the plasma display device of the present invention in detail.

First, referring to FIG. 3, in the plasma display device of the present invention, a frame for implementing gray levels of an image is divided into several subfields having different emission counts. Although not shown, each subfield may further include a reset period for initializing all discharge cells, an address period for selecting discharge cells to be discharged, and a sustain period for implementing gray levels according to the number of discharges. Sustain Period).

For example, when displaying an image with 256 gray levels, a frame period (16.67 ms) corresponding to 1/60 second is divided into eight subfields SF1 to SF8 as shown in FIG. Each of the subfields SF1 to SF8 is divided into a reset period, an address period, and a sustain period.

Meanwhile, the gray scale weight of the corresponding subfield may be set by adjusting the number of sustain pulses 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 pulses 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 device of the present invention uses a plurality of frames to display an image of one second. For example, 60 frames are used to display an image of 1 second.

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

The image quality of the image implemented by the plasma display apparatus implementing the gray level of the image using the frame may be determined according to the number of subfields included in the frame. That is, when 12 subfields are included in a frame, gray levels of 2 ¹² images may be expressed. When 8 subfields are included in a frame, gray levels of 2 ⁸ images may be realized.

Also, in FIG. 3, subfields are arranged according to the order of increasing the magnitude of gray scale weight in one frame. Alternatively, subfields may be arranged in the order of decreasing gray scale weight in one frame. Subfields may be arranged regardless of the weight.

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

Referring to FIG. 4, in the plasma display apparatus of FIG. 1, the scan driver 102 may supply a ramp-up signal in which a voltage gradually increases to the scan electrode Y in a setup period of a reset period. have.

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

In addition, in the set-down period after the setup period, a ramp down ramp in which the voltage is gradually lowered from a predetermined positive voltage lower than the peak voltage of the ramp ramp signal is supplied to the scan electrode Y. Can supply the signal.

As a result, weak erase discharge, that is, set-down discharge, occurs in the discharge cell. This set-down discharge erases a part of the wall charges accumulated in the discharge cell by the previous setup discharge, and the wall charges such that the address discharge can be stably generated in the discharge cell remain uniformly.

In the address period after the reset period, the scan driver 102 supplies a scan rising signal to the scan electrode Y. In addition, a scan bias signal is supplied to the scan electrode Y at the end of the scan rising signal.

In addition, the scan driver 102 may supply a scan signal falling from the scan reference signal to the scan electrode (Y). This scan signal is preferably lowered from the scan reference signal to the negative scan voltage (-Vy).

Here, the data driver 101 is configured to supply data to the address electrode X when the scan signal is supplied to the scan electrode Y, that is, when the scan driver 102 supplies the scan signal to the scan electrode Y. Can supply the signal. Here, it is preferable that the data signal rises to the data voltage Vd.

In this address period, the voltage difference between the scan signal and the data signal, preferably the voltage difference between the negative scan voltage (-Vy) and the data voltage (Vd) and the wall voltage due to the wall charges generated in the reset period, are added. In the discharge cells to which the data signal is supplied, address discharge is generated.

In this discharge cell selected by the address discharge, wall charges are formed such that a discharge can occur when a sustain signal is supplied.

On the other hand, the sustain driver 103 supplies the sustain rising signal to the sustain electrode Z while the scan rising signal is supplied to the scan electrode Y. In addition, it is preferable to supply a sustain bias signal to the sustain electrode Z at the end of the sustain rising signal.

Here, the sustain bias signal performs a function such as preventing occurrence of an erroneous discharge due to interference of the sustain electrode Z in the address period.

In the sustain period after the address period, the scan driver 102 and / or the sustain driver 103 may supply the sustain signal SUS to the scan electrode Y or the sustain electrode Z. FIG. Here, it is preferable that the sustain signal has a voltage difference of the sustain voltage Vs.

Accordingly, the discharge cells selected by the address discharge have the scan voltage Y and the sustain electrode each time the sustain signal Vs is supplied while the wall voltage in the discharge cell and the sustain voltage Vs of the sustain signal Vs are added. A sustain discharge, that is, a display discharge occurs between Z). Accordingly, a predetermined image is implemented on the plasma display panel.

Here, the scan rise signal and the sustain rise signal, which are the main features of the present invention, will be described in more detail as follows.

5 is a diagram for describing a scan rise signal and a sustain rise signal in more detail.

Referring to FIG. 5, the scan rising signal is a form in which the voltage gradually increases from the tenth voltage V10 to the twentieth voltage V20.

In addition, the sustain rising signal may be generated while the scan rising signal is supplied to the scan electrode (Y), that is, while the scan driver 102 of FIG. 1 provides the scan rising signal to the scan electrode (Y). The first slope is increased from V1 to the second voltage V2, and thereafter, the second slope is different from the first slope from the second voltage V2 to the third voltage V3, and the third voltage V3 is increased. ) And the fourth voltage V4 rises with a third slope different from the second slope.

The sustain rise signal is preferably supplied to the sustain electrode Z before the scan signal is supplied to the scan electrode Y. In this way, if the sustain rising signal is supplied before the scan signal is supplied to the scan electrode Y, the sustain rising signal does not interfere with the address discharge generated between the data signal and the scan signal, and thus the address discharge becomes unstable. It can prevent.

As described above, the effects of the sustain rising signal supplied to the sustain electrode Z when the scan rising signal is supplied to the scan electrode Y will be described with reference to FIGS. 6A to 6B.

6A to 6B are views for explaining the effect when the sustain rising signal is supplied to the sustain electrode Z when the scan rising signal is supplied to the scan electrode.

First, referring to FIG. 6A, a case in which the sustain rising signal is not supplied to the sustain electrode Z is illustrated.

For example, while the scan rising signal is supplied to the scan electrode Y as shown in FIG. 6A, the sustain rising signal is rapidly supplied from the first voltage V1 to the fourth voltage V4 without being supplied with the sustain rising signal. When a signal is supplied, noise occurs due to a coupling effect while the voltage of the sustain electrode Z rises from the first voltage V1 to the fourth voltage V4.

Such noise may cause unstable driving of the plasma display device, and may also cause a problem of generating electromagnetic interference (EMI).

Even when the amount of noise increases excessively, switching elements of the scan driver 102 and / or the sustain driver 103 of FIG. 1 may be damaged.

Next, referring to FIG. 6B, a case where the sustain rising signal is supplied to the sustain electrode Z is illustrated.

For example, while the scan rising signal is supplied to the scan electrode Y as shown in FIG. 6B, the voltage rises at the first slope from the first voltage V1 to the second voltage V2 at the sustain electrode Z. Subsequently, a third slope different from the first slope from the second voltage V2 to the third voltage V3 is increased, and a third slope different from the second slope from the third voltage V3 to the fourth voltage V4 is different. When the sustain rising signal rising with the slope is supplied, the rate of change of the voltage per hour of the sustain electrode Z becomes relatively small.

Accordingly, while the voltage of the sustain electrode Z rises from the first voltage V1 to the second voltage V2, while the voltage rises from the second voltage V2 to the third voltage and the third voltage V3. To the fourth voltage V4, the coupling effect is weakened, and the generation of noise is significantly reduced.

This reduces the occurrence of electromagnetic interference (EMI) and also stabilizes the driving of the plasma display device of the present invention.

Here, the description of FIGS. 6A to 6B will be finished, and the description will be made with reference to FIG. 5 again.

It is preferable that the sustain electrode Z be floated in the period d1 when the voltage of the sustain rising signal rises from the first voltage V1 to the second voltage V2. That is, it is preferable that the voltage of the sustain electrode Z rises from the first voltage V1 to the second voltage V2 by floating the sustain electrode Z.

This floating will be described in more detail later with reference to FIG. 7.

The period d1 during which the voltage of the sustain rising signal rises from the first voltage V1 to the second voltage V2 is preferably 50 ns (nanoseconds) or more and 250 ns (nanoseconds) or less.

Here, more preferably, the period d1 of rising from the first voltage V1 to the second voltage V2 is approximately 100 ns (nanoseconds).

In this way, when the d1 period is set to 50 ns (nanoseconds) or 250 ns (nanoseconds) or less, and preferably about 100 ns (nanoseconds), the coupling effect can be more effectively attenuated in this d1 period, thereby further reducing the generation of noise. .

For example, if the d1 period is set to less than 50 ns (nanoseconds), the rate of voltage change per hour may be excessively increased in this d1 period, thereby increasing the coupling effect, thereby increasing the possibility of generating noise. On the other hand, if the d1 period is set to exceed 250 ns (nanoseconds), it is preferable to set the d1 period to more than 50 ns (nanoseconds) and 250 ns (nanoseconds), since the possibility of excessive increase of the overall operating time is increased.

On the other hand, in the period d2 during which the voltage of the sustain rising signal rises from the second voltage V2 to the third voltage V3, it is preferable that the voltage previously stored in the sustain electrode Z is supplied through LC resonance. That is, it is preferable to rise from the first voltage V1 to the second voltage V2 through LC resonance.

This LC resonance will be described in more detail later with reference to FIG. 7.

The period d2 during which the voltage of the sustain rising signal rises from the second voltage V2 to the third voltage V3 is preferably 250 ns (nanoseconds) or more and 550 ns (nanoseconds) or less.

Here, more preferably, the period d2 of rising from the second voltage V2 to the third voltage V3 is approximately 400 ns (nanoseconds).

In this way, if the d2 period is set to 250 ns (nanoseconds) or more and 550 ns (nanoseconds) or less, and preferably about 400 ns (nanoseconds), the generation of noise can be further reduced by effectively weakening the coupling effect in the d2 period. .

For example, if the d2 period is set to less than 250 ns (nanoseconds), the rate of voltage change per hour in the d2 period is excessively increased, thereby increasing the coupling effect, thereby increasing the possibility of noise generation. On the other hand, setting the d2 period to 550 ns (nanoseconds) exceeds the d2 period of 250 ns (nanoseconds) because it can increase the overall operating time or increase the possibility of distortion, such as a sustain rising signal. It is desirable to set it to 550ns (nanoseconds) or more.

In addition, the second slope while the sustain rising signal rises from the second voltage V2 to the third voltage V3 in the d2 period is the scan electrode Y and / or the sustain electrode Z in the sustain period after the address period. It is preferable that the rising slope of the sustain signal SUS supplied to be substantially equal to the rising slope. This will be clarified through the following description of FIG. 7.

On the other hand, it is preferable that the sustain electrode Z be floated in the period d3 when the voltage of the sustain rising signal rises from the third voltage V3 to the fourth voltage V4. That is, it is preferable that the voltage of the sustain electrode Z rises from the third voltage V3 to the fourth voltage V4 by floating the sustain electrode Z.

This floating will be described in more detail later with reference to FIG. 7.

The period d3 at which the voltage of the sustain rising signal rises from the third voltage V3 to the fourth voltage V4 is preferably 50 ns (nanoseconds) or more and 250 ns (nanoseconds) or less.

Here, more preferably, the period d3 of rising from the third voltage V3 to the fourth voltage V4 is approximately 100 ns (nanoseconds).

In this way, if the d3 period is set to 50 ns (nanoseconds) or more and 250 ns (nanoseconds) or less, and preferably about 100 ns (nanoseconds), the coupling effect can be more effectively attenuated in this d3 period, thereby further reducing the generation of noise. .

For example, if the d3 period is set to less than 50 ns (nanoseconds), the rate of voltage change per hour in the d3 period may be excessively increased to further increase the coupling effect, thereby increasing the possibility of generating noise. On the other hand, if the d1 period is set to exceed 250 ns (nanoseconds), it is preferable that the d3 period be 50 ns (nano seconds) or more than 250 ns (nanoseconds) because the overall driving time may increase.

An example of the implementation of the sustain driver for supplying the sustain rising signal described above to the sustain electrode Z is as follows.

7 is a view for explaining an example of implementing a sustain driver of the plasma display device of the present invention.

Referring to FIG. 7, the sustain driver of the present invention includes a voltage storage unit 700, a storage voltage supply unit 701, a voltage recovery unit 702, a resonator unit 703, a sustain voltage supply unit 704, It is preferable to include a base voltage supply 705 and a sustain bias voltage supply 706.

The voltage storage unit 700 includes a voltage storage capacitor unit C, and stores the voltage using the energy storage capacitor unit C.

The storage voltage supply unit 701 includes a storage voltage supply control switch unit S1, and the voltage stored in the voltage storage unit 700 by using the storage voltage supply control switch unit S1 is a sustain electrode of the plasma display panel. Z).

The voltage recovery unit 702 includes a voltage recovery control switch S2, and the reactive energy of the sustain electrode Z of the plasma display panel is supplied to the voltage storage unit 700 by using the voltage recovery control switch S2. To be recovered and stored.

The resonator 703 includes a resonant inductor part L, and when the voltage stored in the voltage storage part 700 is supplied to the sustain electrode Z by using the resonant inductor part L and the sustain electrode. When the voltage of (Z), that is, the reactive voltage of the sustain electrode Z is recovered to the voltage storage unit 100, resonance, that is, LC resonance is generated.

The sustain voltage supply unit 704 includes a sustain voltage supply control switch unit S3, and the sustain voltage Vs generated by the sustain voltage source is the sustain electrode Z using the sustain voltage supply control switch unit S3. To be supplied.

The base voltage supply unit 705 includes a base voltage supply control switch unit S4, and the base voltage GND generated by the base voltage source is the sustain electrode Z using the base voltage supply control switch unit S4. To be supplied. That is, the sustain electrode Z is grounded.

The sustain bias voltage supply unit 706 includes a sustain bias voltage supply control switch unit S5, and the sustain bias voltage Vzb generated by the sustain bias voltage source is sustained using the sustain bias voltage supply control switch unit S5. It is supplied to the electrode (Z).

The operation of the driving unit of the plasma display apparatus of FIG. 7 according to the present invention will be described with reference to FIGS. 8A to 8B.

8A to 8B are views for explaining an example of the operation of the sustain driver of the plasma display device of the present invention of FIG.

First, referring to FIG. 8A, an example of an operation of the sustain driver of FIG. 7 for supplying a sustain rising signal to the sustain electrode Z is illustrated.

First, before the d1 period, the base voltage supply control switch part S4 of the base voltage supply part 705 is turned on. Then, as before the period d1 in FIG. 8A, the voltage of the sustain electrode Z maintains the base voltage GND.

Next, in the d1 period, the base voltage supply control switch part S4 of the base voltage supply part 705 is turned off, and the storage voltage supply control switch part S1 and the voltage recovery part of the remaining storage voltage supply part 701 are turned off. The voltage recovery control switch part S2 of 702, the sustain voltage supply control switch part S3 of the sustain voltage supply part 704, and the sustain bias voltage supply control switch part S5 of the sustain bias voltage supply part 706 are both Is off.

As a result, the sustain electrode Z is in a floating state.

In this d1 period, as shown in FIG. 4, the scan rising signal is supplied to the scan electrode Y, thereby increasing the voltage of the scan electrode Y from the tenth voltage V10 to the twentieth voltage V20. Accordingly, the voltage of the sustain electrode Z increases from the first voltage V1 to the second voltage V2 due to the coupling effect with the scan electrode Y to which the scan rising signal is supplied.

That is, during the period in which the voltage of the sustain rising signal rises from the first voltage V1 to the second voltage V2, the storage voltage supply unit 701, the voltage recovery unit 702, the sustain voltage supply unit 704, The base voltage supply 705 and the sustain bias voltage supply 706 are both off.

Next, in the d2 period, the storage voltage supply unit 701 is turned on while the voltage recovery unit 702, the sustain voltage supply unit 704, the base voltage supply unit 705, and the sustain bias voltage supply unit 706 are turned off.

Then, a current path through the voltage storage unit 700, the first node n1, the storage voltage supply unit 701, the second node n2, the resonator unit 703, and the third node n3. Is formed. Accordingly, the voltage stored in the voltage storage unit 700 is supplied to the sustain electrode Z through LC resonance by the inductor unit L of the resonator unit 703, whereby the voltage of the sustain rising signal is supplied to the second voltage. It rises from (V2) to the third voltage (V3).

That is, during the period in which the voltage of the sustain rising signal rises from the second voltage V2 to the third voltage V3, the voltage recovery unit 702, the sustain voltage supply unit 704, the base voltage supply unit 705, and the sustain The bias voltage supplies 706 are all off and the storage voltage supplies 701 are on.

Next, in the d3 period, the storage voltage supply control switch part S1 of the storage voltage supply part 701 is turned off, and the ground voltage supply control switch part S4 and the voltage recovery part 702 of the remaining ground voltage supply part 705 are turned off. The voltage recovery control switch S2, the sustain voltage supply control switch S3 of the sustain voltage supply unit 704, and the sustain bias voltage supply control switch S5 of the sustain bias voltage supply unit 706 are all turned off.

As a result, the sustain electrode Z is in a floating state.

In this d3 period, the scan rising signal is supplied to the scan electrode Y as in the previous d1 period, whereby the voltage of the scan electrode Y increases from the tenth voltage V10 to the twentieth voltage V20. Accordingly, the voltage of the sustain electrode Z increases from the third voltage V3 to the fourth voltage V4 due to the coupling effect with the scan electrode Y to which the scan rising signal is supplied.

That is, during the period in which the voltage of the sustain rising signal rises from the third voltage V3 to the fourth voltage V4, the storage voltage supply unit 701, the voltage recovery unit 702, the sustain voltage supply unit 704, The base voltage supply 705 and the sustain bias voltage supply 706 are both off.

Through this process it is possible to supply a sustain rising signal to the sustain electrode (Z).

Next, after the d3 period, the sustain bias voltage supply control switch S5 of the sustain bias voltage supply unit 706 is turned on.

Then, the sustain bias voltage Vzb generated by the sustain bias voltage source is supplied to the sustain electrode Z. Accordingly, the sustain electrode Z actually maintains the sustain bias voltage Vzb.

In this way, the sustain driver can supply the sustain signal to the sustain electrode (Z).

Next, referring to FIG. 8B, an example of an operation of the sustain driver of FIG. 7 for supplying a sustain signal to the sustain electrode Z is illustrated.

First, before the d20 period, the base voltage supply control switch unit S4 of the base voltage supply unit 705 is turned on. Then, as before the d20 period in FIG. 8B, the voltage of the sustain electrode Z maintains the base voltage GND.

Next, in the d20 period, the voltage recovery unit 702, the sustain voltage supply unit 704, the base voltage supply unit 705, and the sustain bias voltage supply unit 706 are turned off, and the storage voltage supply unit 701 is turned on.

Then, a current path through the voltage storage unit 700, the first node n1, the storage voltage supply unit 701, the second node n2, the resonator unit 703, and the third node n3. Is formed. Accordingly, the voltage stored in the voltage storage unit 700 is supplied to the sustain electrode Z through LC resonance by the inductor unit L of the resonance unit 703.

Here, assuming that the voltage storage unit 700 has a sustain voltage of 0.5 times, that is, a voltage of 1 / 2Vs, the voltage of the sustain electrode Z may increase to the maximum sustain voltage Vs in the d20 period. .

Here, when the period d20 of FIG. 8B is compared with the period d2 of FIG. 8A, the switching operation of the switching elements is the same.

Accordingly, the slope of the rising slope of the sustain signal and the voltage of the sustain rising signal rising from the second voltage V2 to the third voltage V3, that is, the slope in the d2 period of FIG. 8A described above are approximately the same.

Next, in the d21 period, the sustain voltage supply control switch part S3 of the sustain voltage supply part 704 is turned on. Then, the sustain voltage Vs generated by the sustain voltage source is supplied to the sustain electrode Z via the third node n3.

As a result, the sustain electrode Z keeps the sustain voltage Vs substantially constant.

Next, in the d22 period, the voltage recovery unit 702 in a state where both the sustain voltage supply control switch unit S3 of the sustain voltage supply unit 704 and the storage voltage supply control switch unit S1 of the storage voltage supply unit 701 are turned off. The voltage recovery control switch unit S2 is turned on.

Then, via the sustain electrode Z, the third node n3, the resonator 703, the second node n2, the voltage recovery unit 702, the first node n1, and the voltage storage unit 700. A current path is formed, whereby the voltage of the sustain electrode Z is recovered and stored in the voltage storage unit 700 through LC resonance by the resonator 703.

As a result, the voltage of the sustain electrode Z can drop from the sustain voltage Vs to the lowest base voltage GND.

Next, after the d22 period, the base voltage supply control switch part S4 of the base voltage supply part 705 is turned on.

Then, the ground voltage GND generated by the ground voltage source is supplied to the sustain electrode Z. In other words, the sustain electrode Z is grounded.

Accordingly, the sustain electrode Z substantially maintains the base voltage GND.

In this way, the sustain driver can supply the sustain signal to the sustain electrode Z.

On the other hand, the length of the same sustain rising signal may be varied in consideration of the gray scale weight of the subfield included in the frame.

FIG. 9 is a diagram for describing an example of a method of varying a length of a sustain rising signal in consideration of gray scale weights of a subfield.

9, the length of the sustain rising signal supplied to the sustain electrode Z is different from other subfields in at least one of the plurality of subfields of the frame.

For example, one frame includes a total of seven subfields, that is, first, second, third, fourth, fifth, sixth, seventh subfields, and the gray scale weights of the seven subfields are first, second, and third. Suppose that increases in order of 4, 5, 6, and 7 subfields.

Here, in the first subfield, the sustain rising signal has a length of d1 + d2 + d3.

On the other hand, in the sixth subfield in which the gray scale weight is larger than the first subfield, the sustain rising signal has a length d1 '+ d2' + d3 'shorter than d1 + d2 + d3.

That is, the length of the sustain rising signal may be longer than that of the subfield having a relatively large gray scale weight in a subfield having a relatively small gray weight.

As described above, when the length of the sustain rising signal is longer than that of the subfield having a relatively large gray weight, in a subfield having a relatively small gray weight, the number of sustain signals supplied in the sustain period is relatively low, that is, the gray scale. The address discharge that is more likely to become unstable in a subfield having a relatively small weight can be stabilized more.

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, the plasma display apparatus of the present invention supplies a scan rising signal to the scan electrode Y, and supplies the sustain rising signal to the sustain electrode Z while the scan rising signal is supplied to the scan electrode Y. By supplying it to, it is effective to reduce the occurrence of noise and electromagnetic interference (EMI).

Claims (12)

A plasma display panel on which scan electrodes and sustain electrodes are formed; A scan driver for supplying a scan rising signal to the scan electrode, the voltage of which is gradually increased before the first scan signal is supplied in an address period for addressing; And While the scan rising signal is supplied to the scan electrode, a voltage rises with a first slope from a first voltage to a second voltage, rises with a second slope different from the first slope from the second voltage to a third voltage, A sustain driver for supplying a sustain rising signal rising to a third slope different from the second slope from the third voltage to a fourth voltage to the sustain electrode; Plasma display device comprising a. The method of claim 1, And the sustain rising signal is supplied to the sustain electrode before the scan signal is supplied to the scan electrode. The method of claim 1, And a period of rising from the first voltage to the second voltage is 50 ns or more and 250 ns or less. Claim 4 was abandoned when the registration fee was paid. The method of claim 3, wherein And a period of rising from the first voltage to the second voltage is 100 ns (nanosecond). The method of claim 1, And a period of rising from the second voltage to the third voltage is 250 ns or more and 550 ns or less. Claim 6 was abandoned when the registration fee was paid. The method of claim 5, And a period of rising from the second voltage to the third voltage is 400 ns (nanosecond). The method of claim 1, And a period of rising from the third voltage to the fourth voltage is 50 ns or more and 250 ns or less. Claim 8 was abandoned when the registration fee was paid. The method of claim 7, wherein And a period of rising from the first voltage to the second voltage is 100 ns (nanosecond). The method of claim 1, The second slope is And a rising slope of the sustain pulse supplied to at least one of the scan electrode and the sustain electrode in the sustain period after the address period. Claim 10 was abandoned upon payment of a setup registration fee. The method of claim 1, The sustain drive unit A voltage storage unit for storing a voltage; A storage voltage supply unit supplying a voltage stored in the voltage storage unit to the sustain electrode; A voltage recovery unit for recovering and storing the voltage of the sustain electrode to the voltage storage unit; A resonator that generates resonance when the voltage stored in the voltage store is supplied to the sustain electrode and when the voltage of the sustain electrode is recovered to the voltage store; A sustain voltage supply unit supplying a sustain voltage to the sustain electrode; A base voltage supply unit supplying a base voltage to the sustain electrode; And A sustain bias voltage supply unit supplying the fourth voltage to the sustain electrode; Plasma display device comprising a. Claim 11 was abandoned upon payment of a setup registration fee. The method of claim 10, The storage voltage supply unit, the voltage recovery unit, the sustain voltage supply unit, the base voltage supply unit, and the sustain period during the period of rising from the first voltage to the second voltage and the period from the third voltage to the fourth voltage. And all of the bias voltage supply units are turned off. Claim 12 was abandoned upon payment of a registration fee. The method of claim 10, The voltage recovery part, the sustain voltage supply part, the base voltage supply part and the sustain bias voltage supply part are all turned off during the period of rising from the second voltage to the third voltage, and the storage voltage supply part is turned on. On) plasma display device characterized in that.

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