KR20070082811A - Plasma display apparatus - Google Patents

Abstract

A plasma display apparatus is provided to reduce manufacturing cost by generating a sustain pulse, which is swung between a Vs/2 voltage and a ground voltage, and alternately supplying the sustain pulse to scan and sustain electrodes. A plasma display apparatus includes a plasma display panel having scan and sustain electrodes, and a driver. The driver includes first and second inductors(700,701), first and second increasing voltage supply units(710,711) for supplying a gradually increasing voltage to the scan and sustain electrodes through the first and second inductors, first and second voltage storing units(730,731) for storing a Vs/2 voltage from a voltage source, first and second sustain voltage supply units(720,721) for supplying the sum of the Vs/2 voltage from the voltage source and the Vs/2 from the first and second voltage storing units to the scan and sustain electrodes, first and second decreasing voltage supply units(740,741) for supplying a gradually decreasing voltage to the scan and sustain electrodes through the first and second inductors, and first and second ground voltage supply units(750,751) for supplying a ground voltage to the scan and sustain electrodes.

Description

Plasma Display Apparatus {Plasma Display Apparatus}

BRIEF DESCRIPTION OF THE DRAWINGS The figure for demonstrating the structure of the drive part of the conventional plasma display apparatus.

2 is a view for explaining the operation of the driving unit of the conventional plasma display device.

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

4A to 4B 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. 5 is a diagram for explaining a frame for implementing gradation of an image in the plasma display device of the present invention; FIG.

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

7 is a view for explaining the configuration of a drive unit of the plasma display device of the present invention.

8A to 8I are views for explaining the operation of the driving unit of the plasma display device of the present invention.

<Explanation of symbols for main parts of the drawings>

300: plasma display panel 301: data driver

302: scan driver 303: sustain driver

The present invention relates to a plasma display device, and more particularly, to a plasma display device (Plasma Display Apparatus) with an improved drive unit for driving the scan electrode (Y) and the sustain electrode (Z).

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

Then, the discharge is generated by the driving voltage supplied 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.

Here, the discharges generated in the discharge cells of the plasma display panel include reset discharges, address discharges, sustain discharges, and the like.

The reset discharge is a discharge for initializing all the discharge cells, the address discharge is a discharge for selecting a discharge cell in which the sustain discharge which is the display discharge is to be generated, and the sustain discharge is the display discharge for displaying an image on the screen.

The sustain discharge is generated by the sustain pulses supplied to the scan electrode Y and the sustain electrode Z.

The driving unit of the conventional plasma display apparatus for supplying the sustain pulse generating the sustain discharge to the scan electrode Y and the sustain electrode Z is as follows.

1 is a view for explaining a configuration of a driving unit of a conventional plasma display device.

Referring to FIG. 1, the driving unit of the conventional plasma display apparatus includes first and second voltage storage units 100 and 101, first and second voltage supply units 110 and 111, first and second voltage recovery units 120 and 121, The first and second inductor parts 150 and 151, the first and second sustain voltage supplies 130 and 131, and the first and second base voltage supplies 140 and 141 are included.

The operation of the driving unit of the conventional plasma display apparatus will be described with reference to FIG. 2.

2 is a view for explaining the operation of the driving unit of the conventional plasma display device.

Referring to FIG. 2, when the first voltage supply unit 110 is turned on in a period d1, the voltage stored in the first voltage storage unit 100 may be scanned through the LC resonance by the first inductor unit 150. Is supplied. As a result, the voltage of the scan electrode Y gradually rises from the base voltage GND.

Next, when the first sustain voltage supply unit 130 is turned on in the d2 period, the sustain voltage Vs is supplied to the scan electrode Y. As a result, the voltage of the scan electrode Y maintains the sustain voltage Vs.

Next, when the first voltage recovery unit 120 is turned on while the first voltage supply unit 110 and the first sustain voltage supply unit 130 are turned off in the period d3, the reactive voltage on the scan electrode Y is increased. The LC voltage is recovered and stored in the first voltage storage unit 100 through LC resonance by the first inductor unit 150. As a result, the voltage of the scan electrode Y gradually decreases from the sustain voltage Vs.

Next, when the first base voltage supply unit 140 is turned on in the d4 period, the base voltage GND is supplied to the scan electrode Y. Accordingly, the voltage of the scan electrode Y maintains the base voltage GND for a predetermined time. In addition, when the second voltage supply unit 111 is turned on, the voltage stored in the second voltage storage unit 101 is supplied to the sustain electrode Z through LC resonance by the second inductor unit 151. As a result, the voltage of the sustain electrode Z gradually rises from the base voltage GND.

Next, when the second sustain voltage supply unit 131 is turned on in the d5 period, the sustain voltage Vs is supplied to the sustain electrode Z. As a result, the voltage of the sustain electrode Z maintains the sustain voltage Vs.

Next, when the second voltage recovery unit 121 is turned on while the second voltage supply unit 111 and the second sustain voltage supply unit 131 are turned off in the period d6, the reactive voltage on the sustain electrode Z is reduced. The LC voltage is recovered and stored in the second voltage storage unit 101 through LC resonance by the second inductor unit 151. As a result, the voltage of the sustain electrode Z gradually decreases from the sustain voltage Vs.

In this process, the driving unit of the conventional plasma display apparatus alternately supplies sustain pulses swinging from the base voltage GND to the sustain voltage Vs to the scan electrode Y and the sustain electrode Z.

Here, the above-mentioned sustain voltage (Vs) is a high voltage of approximately 170V or more and 200V or less, and accordingly, from the ground voltage (GND) to the sustain voltage (Vs) using the sustain voltage (Vs) supplied by the sustain voltage (Vs). Switching elements used in a driving unit of a conventional plasma display device that supplies a swinging sustain pulse should have relatively high withstand voltage characteristics.

As a result, the manufacturing cost of the plasma display device increases.

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide a plasma display device for lowering the breakdown voltage characteristics of switching elements used by improving a driving unit for supplying a sustain pulse.

The plasma display apparatus of the present invention for achieving the above object is a plasma display panel having a scan electrode and a sustain electrode, and a sustain pulse swinging at a width of the Vs voltage at a voltage of Vs / 2 supplied by a voltage source. It is preferable to include a drive unit for supplying alternately to the sustain electrode.

The driving unit may further include a first inductor unit, a first rising voltage supply unit configured to supply a voltage gradually rising to the scan electrode through the first inductor unit, and a first voltage store configured to store a Vs / 2 voltage supplied by a voltage source. A first sustain voltage supply unit configured to supply a scan electrode with a sum of Vs / 2 voltage supplied by the voltage source and Vs / 2 voltage stored by the first voltage storage unit, and the scan electrode is gradually provided to the scan electrode through the first inductor unit. A first falling voltage supply unit supplying a voltage falling down to the first electrode; a first base voltage supply unit supplying a ground voltage GND to the scan electrode; a second inductor unit; and a second inductor unit; A second rising voltage supply unit for supplying a rising voltage, a second voltage storage unit for storing a Vs / 2 voltage supplied by a voltage source, a Vs / 2 voltage and the second voltage storage supplied by the voltage source; A second sustain voltage supply unit supplying the sum of the stored Vs / 2 voltages to the sustain electrode, a second falling voltage supply unit supplying a voltage gradually decreasing to the scan electrode through the second inductor unit, and a base voltage to the scan electrode. And a second base voltage supply for supplying a voltage GND.

In addition, the second base voltage supply unit is in an on state while the sustain pulse supplied to the scan electrode swings with the width of the Vs voltage.

In addition, the first base voltage supply part is in an on state while the sustain pulse supplied to the sustain electrode swings with the width of the Vs voltage.

The first and second voltage storage parts may include first and second voltage storage capacitor parts for storing the Vs / 2 voltage.

In addition, between the first and second voltage storage unit and the voltage source for supplying the Vs / 2 voltage, the first and second reverse current prevention unit for preventing the voltage stored in the first and second voltage storage unit from falling toward the voltage source It is characterized in that each is further provided.

The first clamping part and the second clamping clamping an overvoltage generated in the first inductor part between the first inductor part and the ground GND and between the first inductor part and the first voltage storage part. An additional feature is provided.

The third clamping part and the fourth clamping part which clamp the overvoltage generated in the second inductor part between the second inductor part and the ground GND and between the second inductor part and the second voltage storage part. An additional feature is provided.

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

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

Referring to FIG. 3, the plasma display apparatus of the present invention includes a plasma display panel 300 and a driver 301.

The plasma display panel 300 includes a scan electrode Y and a sustain electrode Z. In addition, the plasma display panel 300 according to the present invention preferably further includes an address electrode (X).

The driving unit 301 supplies a sustain pulse to the scan electrode Y and the sustain electrode Z of the plasma display panel 300 to drive the scan electrode Y and the sustain electrode Z.

In particular, the driving unit 301 alternately supplies a sustain pulse swinging with the width of the Vs voltage to the scan electrode Y and the sustain electrode Z by using the Vs / 2 voltage supplied by the voltage source. Y) and the sustain electrode Z are driven.

In addition, the driving unit 301 may more preferably supply a reset pulse and a scan pulse to the scan electrode Y of the plasma display panel 300, and supply a sustain bias voltage Vzb to the sustain electrode Z.

The driving unit 301, which is a main feature of the plasma display device of the present invention, will be more clearly described later.

Here, an example of the structure of the plasma display panel 300 will be described in detail with reference to FIGS. 4A to 4B.

4A to 4B 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. 4A, a plasma display panel of the present invention includes a front panel including a front substrate 401 on which electrodes, preferably scan electrodes 402 and Y, and sustain electrodes 403 and Z, are formed. A rear panel (400) and a rear substrate 411 on which electrodes, preferably address electrodes 413 and X, which intersect the aforementioned scan electrodes 402 and Y and the sustain electrodes 403 and Z are formed ( 410 is made of a combination.

Here, the electrodes formed on the front substrate 401, preferably the scan electrodes 402 and Y and the sustain electrodes 403 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 the front substrate 401 on which the scan electrodes 402 and Y and the sustain electrodes 403 and Z are formed, covers the scan electrodes 402 and Y and the sustain electrodes 403 and Z. Upper dielectric layer 404 is formed.

This upper dielectric layer 404 limits the discharge current of the scan electrodes 402 and Y and the sustain electrodes 403 and Z and insulates the scan electrodes 402 and Y from the sustain electrodes 403 and Z.

A protective layer 405 is formed on the upper dielectric layer 404 to facilitate discharge conditions. The protective layer 405 is formed through a method of depositing a material such as magnesium oxide (MgO) over the upper dielectric layer 404.

Meanwhile, the electrodes formed on the rear substrate 411, preferably the address electrodes 413 and X, are electrodes for supplying data pulses to the discharge cells.

A dielectric layer, preferably a lower dielectric layer 415, is formed on the rear substrate 411 on which the address electrodes 413 and X are formed to cover the address electrodes 413 and X.

This lower dielectric layer 415 insulates the address electrodes 413, X.

The upper portion of the lower dielectric layer 415 is formed with a discharge space, that is, a partition wall 412 such as a stripe type or a well type for partitioning the discharge cells. Accordingly, discharge cells such as red (R), green (G), and blue (B) are formed between the front substrate 401 and the rear substrate 411.

Here, a predetermined discharge gas is filled in the discharge cell partitioned by the partition wall 412.

In addition, a phosphor layer 414 is formed in a discharge cell partitioned by the partition wall 412 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, the driving voltage is driven by the driving unit 301 of FIG. 3 with at least one of the scan electrodes 402, Y, the sustain electrodes 403, Z, and the address electrodes 413, X. When this is supplied, discharge occurs in the discharge cells partitioned by the partition wall 412.

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 414 formed in the discharge cells. Then, a predetermined visible light is generated in the phosphor layer 414, and the visible light is emitted to the outside through the front substrate 401 on which the upper dielectric layer 404 is formed. A predetermined image is displayed on the outer surface.

Meanwhile, in the description of FIG. 4A, only the case where the scan electrodes 402 and Y and the sustain electrodes 403 and Z each consist of one layer is illustrated and described. Alternatively, the scan electrodes 402 and Y or It is also possible that at least one of the sustain electrodes 403 and Z consists of a plurality of layers. This will be described with reference to FIG. 4B.

Referring to FIG. 4B, the scan electrodes 402 and Y and the sustain electrodes 403 and Z may be formed of two layers, respectively.

In particular, in consideration of light transmittance and electrical conductivity, the scan electrodes 402 and Y and the sustain electrodes 403 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 402b and 403b and transparent electrodes 402a and 403a made of transparent indium tin oxide (ITO).

As such, the reason why the scan electrodes 402 and Y and the sustain electrodes 403 and Z include the transparent electrodes 402a and 403a 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 402 and Y and the sustain electrodes 403 and Z include the bus electrodes 402b and 403b is that the scan electrodes 402 and Y and the sustain electrodes 403 and Z are transparent electrodes. In the case of including only 402a and 403a, the driving efficiency can be reduced because the electrical conductivity of the transparent electrodes 402a and 403a is relatively low, so that the transparent electrodes 402a and 403a can cause such a reduction in driving efficiency. To compensate for low electrical conductivity.

4A to 4B, only one example of the plasma display panel of the present invention is shown and described, and the present invention is not limited to the plasma display panel having the structure as shown in FIGS. 4A to 4B. For example, the plasma display panel of FIGS. 4A to 4B shows only the case where the upper dielectric layer 404 and the lower dielectric layer 415 are each one layer, but the upper dielectric layer 404 and At least one or more of the lower dielectric layers 415 may be formed of a plurality of layers.

In view of the above, the plasma display panel which can be applied to the plasma display device of the present invention is formed with the scan electrodes Y and 402 and the sustain electrodes Z and 403, and other conditions are acceptable.

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. 5 to 6.

FIG. 5 is a diagram for explaining a frame for implementing gray levels of an image in the plasma display apparatus of the present invention.

6 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. 5, in the plasma display apparatus 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.

Here, the reset period and the address period of each subfield are the same for each subfield.

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. 5, 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. 5, subfields are arranged in the order of increasing magnitude of gray scale weight in one frame. Alternatively, subfields may be arranged in order of decreasing gray scale weight in one frame, or gray scale. Subfields may be arranged regardless of the weight.

Next, referring to FIG. 6, 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 frame shown in FIG. 5 is illustrated.

Referring to FIG. 6, in the plasma display apparatus of FIG. 3, the driving unit 301 may supply a ramp-up waveform in which a voltage gradually increases to the scan electrode Y in a setup period of a reset period. .

Due to this rising ramp waveform, 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 that ramps down gradually from a predetermined positive voltage lower than the peak voltage of the ramp ramp after supplying the ramp ramp waveform to the scan electrode Y. You can supply waveforms.

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 including the set-up period and the set-down period, the scan electrode includes the scan reference voltage Vsc and the voltage (-Vy) of the negative scan pulse Scan falling from the scan reference voltage Vsc. It can supply to (Y).

In addition, the driver 301 supplies the voltage Vd of the data pulse to the address electrode X when the voltage V− of the negative scan pulse is supplied to the scan electrode Y. FIG.

In addition, the sustain bias voltage Vzb may be supplied to the sustain electrode Z in the address period in order to prevent the occurrence of erroneous discharge due to the interference of the sustain electrode Z in the address period.

In the address period, the voltage difference between the voltage of the negative scan pulse (-Vy) and the voltage of the data pulse (Vd) and the wall voltage caused by the wall charges generated in the reset period are added to the voltage Vd of the data pulse. An address discharge is generated in the discharge cell applied.

In this discharge cell selected by the address discharge, wall charges are formed such that the discharge can occur when the sustain voltage Vs of the sustain pulse is applied.

In the sustain period after the address period, the driving unit 301 supplies the sustain pulse SUS alternately to the scan electrode Y and the sustain electrode Z. FIG. More preferably, the driver 301 swings from the base voltage GND to the sustain voltage Vs using the Vs / 2 voltage supplied by the voltage source to generate a sustain pulse SUS having a width of the sustain voltage Vs. Then, the generated sustain pulse is supplied to the scan electrode Y and the sustain electrode Z.

Accordingly, the discharge cell selected by the address discharge is added between the scan electrode Y and the sustain electrode Z every time the sustain pulse SUS is applied while the wall voltage in the discharge cell and the voltage of the sustain pulse SUS are added together. Sustain discharge, that is, display discharge, occurs. Accordingly, a predetermined image is implemented on the plasma display panel.

Here, the driving unit for supplying the sustain pulse to the scan electrode (Y) and the sustain electrode (Z) in the sustain period will be described in more detail as follows.

7 is a view for explaining the configuration of a drive unit of the plasma display device of the present invention.

Referring to FIG. 7, the driving unit of the plasma display apparatus of the present invention scans a sustain pulse of 0.5 times sustain voltage supplied from a voltage source, that is, a sustain pulse swinging at a width of the sustain voltage Vs at a voltage Vs / 2. Y is alternately supplied to the sustain electrode Z. For this purpose, the driving unit includes a first inductor unit 700, a first rising voltage supply unit 710, a first sustain voltage supply unit 720, and a first voltage storage unit ( 730, the first falling voltage supply part 740, the first base voltage supply part 750, the second inductor part 701, the second rising voltage supply part 711, the second sustain voltage supply part 721, and the second voltage. It is preferable to include the storage part 731, the 2nd falling voltage supply part 741, and the 2nd base voltage supply part 751.

The first inductor 700 includes a first inductor L1 having a predetermined inductance value.

The first rising voltage supply part 710 includes a first switch part Q1, and gradually rises to the scan electrode Y through the first inductor part 700 by using the first switch part Q1. Supply the voltage.

The first switch unit Q1 of the first rising voltage supply unit 710 is an anode in the direction of the first inductor unit 700 as shown in FIG. 7, and the cathode is a voltage Vs / 2. In the case of including an internal diode arranged in the direction of the voltage source to supply, the first diode unit (D1) for blocking the reverse current flowing from the first inductor unit 700 to the voltage source via the first switch unit (Q1) It is preferable that further be provided.

The first diode part D1 has a cathode in the direction of the first inductor part 700 and an anode in the direction of the first rising voltage supply part 710.

The first voltage storage unit 730 includes a first voltage storage capacitor unit C1 for storing a voltage, and Vs / 2 voltage supplied by a voltage source using the first voltage storage capacitor unit C1. Save it.

The first sustain voltage supply unit 720 includes a third switch unit Q3, and the Vs / 2 voltage and voltage source stored by the first voltage storage unit 730 described above using the third switch unit Q3. The sum of the supplied Vs / 2 voltages is supplied to the scan electrode Y.

The first falling voltage supply part 740 includes a second switch part Q2, and gradually descends to the scan electrode Y through the first inductor part 700 by using the second switch part Q2. Supply the voltage.

The second switch unit Q2 of the first falling voltage supply unit 740 is the cathode (Cathode) is the direction of the first inductor unit 700, as shown in Figure 7, the anode (V node / 2) In the case of including an internal diode disposed in the direction of the voltage source to supply, the second diode unit for blocking the reverse current flowing in the direction of the first inductor unit 700 via the second switch unit Q2 from the voltage source ( It is preferable that D2) is further provided.

The second diode part D2 has an anode in the direction of the first inductor part 700 and a cathode is disposed in the direction of the first falling voltage supply part 740.

The first base voltage supply unit 750 includes a fourth switch unit Q4, and supplies the base voltage GND to the scan electrode Y using the fourth switch unit Q4.

The second inductor unit 701 includes a second inductor L2 having a predetermined inductance value.

The second rising voltage supply unit 711 includes a fifth switch unit Q5, and gradually rises to the scan electrode Y through the second inductor unit 701 by using the fifth switch unit Q5. Supply the voltage.

The fifth switch unit Q5 of the second rising voltage supply unit 711 is the excitation of the anode (Anode) of the second inductor unit 701 as shown in FIG. 7, and the cathode (Cathode) to the voltage Vs / 2 Third diode portion D3 for blocking a reverse current flowing from the second inductor portion 701 to the voltage source via the fifth switch portion Q5 in the case of including an internal diode disposed in the direction of the voltage source to be supplied. It is preferable that further be provided.

The third diode part D3 has a cathode in the direction of the second inductor part 701 and an anode in the direction of the second rising voltage supply part 711.

The second voltage storage unit 731 includes a second voltage storage capacitor unit C2 for storing the voltage, and the Vs / 2 voltage supplied by the voltage source using the second voltage storage capacitor unit C2. Save it.

The second sustain voltage supply unit 721 includes a seventh switch unit Q7, and the Vs / 2 voltage supplied by the voltage source using the seventh switch unit Q7 and the aforementioned second voltage storage unit 731. The stored Vs / 2 voltage is supplied to the sustain electrode Z.

The second falling voltage supply unit 741 includes a sixth switch unit Q6, and gradually descends to the sustain electrode Z through the second inductor unit 701 by using the sixth switch unit Q6. Supply the voltage.

The sixth switch Q6 of the second falling voltage supply part 741 is the cathode (Cathode) in the direction of the second inductor part 701 as shown in FIG. 7, and the anode (Vs / 2) In the case of including an internal diode arranged in the direction of the supply voltage source, the fourth diode unit for blocking the reverse current flowing from the voltage source in the direction of the second inductor unit 701 via the sixth switch unit Q6 ( It is preferable that D4) is further provided.

The fourth diode part D4 has an anode in the direction of the second inductor part 701 and the cathode is disposed in the direction of the second falling voltage supply part 741.

The second ground voltage supply unit 751 includes an eighth switch unit Q8, and supplies the ground voltage GND to the sustain electrode Z using the eighth switch unit Q8.

Here, the driving unit according to the present invention, in addition to the components described above, the first reverse current prevention unit 780, the second reverse current prevention unit 781, the first clamping unit 760, the second clamping unit 770, The third clamping part 761 and the fourth clamping part 771 may be further included.

The first reverse current prevention unit 780 includes a first reverse current prevention diode unit D30, and between the first voltage storage unit 730 and the voltage source using the first reverse current prevention diode unit D30. The voltage stored in the first voltage storage unit 730 is prevented from falling toward the voltage source.

The cathode of the first reverse current preventing diode unit D30 is preferably in the direction of the first voltage storage unit 730, and the anode is disposed in the direction of the voltage source.

The second reverse current preventing unit 781 includes a second reverse current preventing diode unit D31, and between the second voltage storage unit 731 and the voltage source using the second reverse current preventing diode unit D31. The voltage stored in the second voltage storage unit 731 is prevented from falling toward the voltage source.

The cathode of the second reverse current preventing diode unit D31 is preferably in the direction of the second voltage storage unit 731, and the anode is disposed in the direction of the voltage source.

The first clamping part 760 includes a first clamping diode part D10. In addition, the first clamping unit 760 including the first clamping diode unit D10 is disposed between the first inductor unit 700 and the ground GND.

Here, the anode of the first clamping diode part D10 is preferably in the direction of the ground GND, and the cathode is preferably disposed in the direction of the first inductor part 700.

The second clamping part 770 includes a second clamping diode part D20. The second clamping unit 770 including the second clamping diode unit D20 is disposed between the first inductor unit 700 and the first voltage storage unit 730 that stores the Vs / 2 voltage.

Here, the cathode of the second clamping diode unit D20 is preferably in the direction of the first voltage storage unit 730, and the anode is disposed in the direction of the first inductor unit 700.

The first clamping part 760 and the second clamping part 770 clamp the overvoltage generated in the first inductor part 700.

The third clamping part 761 includes a third clamping diode part D11. In addition, the third clamping part 761 including the third clamping diode part D11 is disposed between the second inductor part 701 and the ground GND.

Here, the anode of the third clamping diode part D11 is preferably in the direction of the ground GND, and the cathode is disposed in the direction of the second inductor part 701.

The fourth clamping part 771 includes a fourth clamping diode part D21. The fourth clamping part 771 including the fourth clamping diode part D21 is disposed between the second inductor part 701 and the second voltage storage part 731 storing the Vs / 2 voltage.

Here, the cathode of the fourth clamping diode unit D21 is preferably in the direction of the second voltage storage unit 731, and the anode is disposed in the direction of the second inductor unit 701.

The third clamping part 761 and the fourth clamping part 771 clamp the overvoltage generated in the second inductor part 701.

Looking at the arrangement relationship between the components in the drive unit according to the present invention in more detail as follows. Here, a case in which the first, second, third and fourth clamping parts 760, 770, 761 and 771 and the first, second, third and fourth diode parts D1, D2, D3 and D4 are further provided will be described. Shall be.

One end of the first rising voltage supply unit 710 is connected to a voltage source for supplying a Vs / 2 voltage at the 60th node n60, and the other end is one end of the first voltage storage unit 730 at the 40th node n40, One end of the first clamping part 760 and one end of the first diode part D1, that is, the anode terminal are commonly connected.

Here, the other end of the first clamping unit 760 is grounded (GND). The other end of the first diode unit D1, that is, the cathode terminal, is commonly connected to one end of the first inductor unit 700 and one end of the second diode unit D2, that is, the anode terminal, at the tenth node n10. do.

The other end of the second diode unit D2, that is, the cathode terminal, is commonly connected to one end of the second clamping unit 770 and one end of the first falling voltage supply unit 740 at the thirtieth node n30.

The other end of the first falling voltage supply unit 740 is connected to a voltage source for supplying a Vs / 2 voltage together with one end of the first rising voltage supply unit 710 at the sixth node n60 described above.

In addition, the other end of the second clamping unit 770 is connected to the other end of the first voltage storage unit 730 at the fifty node n50.

The other end of the first inductor unit 700 described above is commonly connected to one end of the first base voltage supply unit 750 and the other end of the first sustain voltage supply unit 720 at the twentieth node n20. In addition, the scan electrode Y is connected to the twentieth node n20.

In addition, the other end of the first base voltage supply unit 750 is grounded (GND).

One end of the first sustain voltage supplying unit 720 is the other end of the first voltage storage unit 730 described above at the 50th node n50, the other end of the second clamping unit 770, and the first reverse current preventing unit 780. Common connection with the other end of.

One end of the first reverse current prevention unit 780 is connected to a voltage source supplying a Vs / 2 voltage together with the first rising voltage supply unit 710 and the first falling voltage supply unit 740 at the 60th node n60. do.

One end of the second rising voltage supply unit 711 is connected to a voltage source supplying a Vs / 2 voltage at the sixty-first node n61, and the other end thereof is one end of the second voltage storage unit 731 at the forty-first node n41. One end of the third clamping part 761 and one end of the third diode part D3, that is, the anode terminal are commonly connected.

Here, the other end of the third clamping part 761 is grounded (GND). The other end of the third diode unit D3, that is, the cathode terminal, is commonly connected to one end of the second inductor unit 701 and one end of the fourth diode unit D4, that is, the anode terminal, at the eleventh node n11. .

The other end of the fourth diode unit D4, that is, the cathode terminal, is commonly connected to one end of the fourth clamping unit 771 and one end of the second falling voltage supply unit 741 at the thirty-first node n31.

The other end of the second falling voltage supply unit 741 is connected to a voltage source supplying a Vs / 2 voltage together with one end of the second rising voltage supply unit 711 at the sixty-first node n61.

In addition, the other end of the fourth clamping unit 771 is connected to the other end of the second voltage storage unit 731 at the 51st node n51.

The other end of the second inductor unit 701 is commonly connected to one end of the second base voltage supply unit 751 and the other end of the second sustain voltage supply unit 721 at the twenty-first node n21. In addition, the scan electrode Y is connected to the twenty-first node n21.

In addition, the other end of the second base voltage supply unit 751 is grounded (GND).

One end of the second sustain voltage supply unit 721 is the other end of the second voltage storage unit 731 described above at the 51st node n51, the other end of the fourth clamping unit 771, and the second reverse current prevention unit 781. Common connection with the other end of.

One end of the second reverse current prevention unit 781 is connected to a voltage source supplying a Vs / 2 voltage together with the second rising voltage supply unit 711 and the second falling voltage supply unit 741 at the 61st node n61. do.

The operation of the driving unit according to the present invention described in detail above will be described in detail with reference to FIGS. 8A to 8I.

8A to 8I are views for explaining the operation of the driving unit of the plasma display device of the present invention.

First, referring to FIG. 8A, switching timing of the driving unit according to the present invention is illustrated.

For example, between the time t0 and the time t1, the first switch Q1 of the first rising voltage supply part 710 is turned on as shown in FIG. 8B. In this case, it is assumed that the voltage on the scan electrode Y is the base voltage GND.

Here, a rising voltage supply path leading to the voltage source, the first rising voltage supply unit 710, the first inductor unit 700, and the scan electrode Y is formed. Accordingly, the voltage of the scan electrode Y gradually rises from the base voltage GND through the LC resonance.

At this time, the eighth switch part Q8 of the second base voltage supply part 751 is turned on. As a result, the ground voltage GND is supplied to the sustain electrode Z. Accordingly, the voltage of the sustain electrode Z maintains the base voltage GND.

In addition, between the time t0 and the time t1, the voltage Vs / 2 is supplied from the voltage source to the first voltage storage unit 730 through the first reverse current prevention unit 780, and thus the first voltage storage unit 730. Vs / 2 voltage is stored.

Here, the first reverse current blocking unit 780 blocks the current flowing from the first voltage storage unit 730 to the voltage source between the first voltage storage unit 730 and the voltage source, thereby providing a first voltage storage unit 730 with the first voltage storage unit 730. The stored voltage may be prevented from falling toward the voltage source, and thus the voltage charged in the first voltage storage unit 730 may be kept constant.

On the other hand, the eighth switch portion Q8 of the second base voltage supply portion 751 remains on while the sustain pulse supplied to the scan electrode Y swings with the width of the Vs voltage.

Next, between the time point t1 and the time point t2, as shown in FIG. 8C, in a state where the first switch unit Q1 of the first rising voltage supply unit 710 is turned on, the third switch unit of the first sustain voltage supply unit 720 is turned on. (Q3) is turned on.

Accordingly, the voltage of the sixtieth node n60 is set to the sum of the Vs / 2 voltage supplied from the voltage source and the Vs / 2 voltage stored in the first voltage storage unit 730. That is, it becomes the voltage of Vs. The voltage of this Vs is supplied to the scan electrode Y through the third switch Q3.

Accordingly, the scan electrode Y maintains a voltage of Vs.

At this time, the eighth switch portion Q8 of the second ground voltage supply portion 751 is kept in the on state, so that the voltage of the sustain electrode Z maintains the ground voltage GND, and eventually the scan electrode Y The voltage difference between the sustain electrodes Z becomes the sustain voltage Vs.

Next, between the time t2 and the time t3, both the first switch Q1 of the first rising voltage supply part 710 and the third switch part Q3 of the first sustain voltage supply part 720 are all as shown in FIG. 8D. It turns off and the 2nd switch part Q2 of the 1st falling-voltage supply part 740 is turned on.

Here, a falling voltage supply path is formed to lead to the scan electrode Y, the first inductor 700, the first falling voltage supply 740, and the voltage source. Accordingly, the voltage of the scan electrode Y gradually decreases through the LC resonance from the voltage of Vs.

In addition, as the first switch unit Q1 of the first rising voltage supply unit 710 is turned off, the voltage stored in the first voltage storage unit 730 is lost. Accordingly, the voltage of the first voltage storage unit 730 becomes the base voltage GND.

At this time, the eighth switch unit Q8 of the second base voltage supply unit 751 keeps the on state.

On the other hand, comparing the 8d and 8d it can be seen that the direction of the current flowing in the first inductor 700 is opposite to each other.

As such, when the direction of the current flowing in the first inductor unit 700 is suddenly changed, the counter electromotive force is generated in the first inductor unit 700, and accordingly, an overvoltage is generated in the first inductor unit 700. Can be.

The overvoltage is removed by the first clamping part 760 and the second clamping part 770.

For example, when an overvoltage higher than Vs occurs in the first inductor 700 due to the counter electromotive force, the generated overvoltage falls into the voltage source through the first and second clamping parts 760 and 770. This eliminates overvoltage.

Next, between the time t3 and the time t4, the second switch Q2 of the first falling voltage supply 740 is turned off, as shown in FIG. 8E, and the fourth switch Q4 of the first base voltage supply 750 is turned off. ) Is on.

Accordingly, the ground voltage GND is supplied to the scan electrode Y through the fourth switching unit Q4. That is, the scan electrode Y is grounded. Accordingly, the scan electrode Y maintains the base voltage GND.

At this time, the eighth switch unit Q8 of the second base voltage supply unit 751 maintains the on state, thereby maintaining the voltage difference between the scan electrode Y and the sustain electrode Z at 0V.

Next, between the time t4 and the time t5, the fifth switch part Q5 of the second rising voltage supply part 711 is turned on as shown in FIG. 8F.

Here, a rising voltage supply path leading to the voltage source, the second rising voltage supply unit 711, the second inductor unit 701, and the sustain electrode Z is formed. Accordingly, the voltage of the sustain electrode Z gradually rises from the base voltage GND through the LC resonance.

At this time, the fourth switch unit Q4 of the first base voltage supply unit 750 maintains an on state. Accordingly, the voltage of the scan electrode Y maintains the base voltage GND.

In addition, the voltage Vs / 2 is supplied from the voltage source to the second voltage storage unit 731 through the second reverse current prevention unit 781 between the time t4 and the time t5, and thus the second voltage storage unit 731. Vs / 2 voltage is stored.

Here, the second reverse current prevention unit 781 cuts off the current flowing from the second voltage storage unit 731 to the voltage source between the second voltage storage unit 731 and the voltage source, thereby providing the second voltage storage unit 731 with the second voltage storage unit 731. The stored voltage may be prevented from falling toward the voltage source, and thus the voltage charged in the second voltage storage unit 731 may be kept constant.

On the other hand, the fourth switch unit Q4 of the first base voltage supply unit 750 remains on while the sustain pulse supplied to the sustain electrode Z swings with the width of the Vs voltage.

Next, between the time point t5 and the time point t6, as shown in FIG. 8G, in the state where the fifth switch unit Q5 of the second rising voltage supply unit 711 is turned on, the seventh switch unit of the second sustain voltage supply unit 721 is turned on. Q7 is turned on.

Accordingly, the voltage of the sixty-first node n61 is set to the sum of the Vs / 2 voltage supplied from the voltage source and the Vs / 2 voltage stored in the second voltage storage unit 731. That is, it becomes the voltage of Vs. This voltage of Vs is supplied to the sustain electrode Z through the seventh switch part Q7.

As a result, the sustain electrode Z maintains a voltage of Vs.

At this time, the fourth switch unit Q4 of the first base voltage supply unit 750 is kept in an on state, so that the voltage of the scan electrode Y maintains the base voltage GND, and eventually the scan electrode Y The voltage difference between the sustain electrodes Z becomes the sustain voltage Vs.

Next, between the time point t6 and the time point t7, as shown in FIG. 8H, both the fifth switch unit Q5 of the second rising voltage supply unit 711 and the seventh switch unit Q7 of the second sustain voltage supply unit 721 are both. It turns off and the 6th switch part Q6 of the 2nd falling-voltage supply part 741 is turned on.

Here, a falling voltage supply path leading to the sustain electrode Z, the second inductor unit 701, the second falling voltage supply unit 741, and the voltage source is formed. Accordingly, the voltage of the sustain electrode Z gradually decreases through the LC resonance from the voltage of Vs.

In addition, as the fifth switch unit Q5 of the second rising voltage supply unit 711 is turned off, the voltage stored in the second voltage storage unit 731 is lost. Accordingly, the voltage of the second voltage storage unit 731 becomes the base voltage GND.

At this time, the fourth switch unit Q4 of the first base voltage supply unit 750 maintains the on state.

8F and 8H, the directions of the currents flowing through the second inductor unit 701 are opposite to each other.

As such, when the direction of the current flowing in the second inductor unit 701 is suddenly changed, the counter electromotive force is generated in the second inductor unit 701, and thus, the second inductor unit 701 generates an overvoltage that is temporarily outside the allowable range. Can be.

This overvoltage is removed by the third clamping part 761 and the fourth clamping part 771.

For example, when an overvoltage higher than the voltage of Vs occurs in the second inductor unit 701 due to the counter electromotive force, the generated overvoltage falls into the voltage source through the third and fourth clamping units 761 and 771. This eliminates overvoltage.

Next, after time t7, the sixth switch Q6 of the second falling voltage supply 741 is turned off, and the eighth switch Q8 of the second ground voltage supply 751 is turned on as shown in FIG. 8I. .

Accordingly, the ground voltage GND is supplied to the sustain electrode Z through the eighth switching unit Q8. In other words, the sustain electrode Z is grounded. Accordingly, the sustain electrode Z maintains the base voltage GND.

At this time, the fourth switch unit Q4 of the first base voltage supply unit 750 maintains the on state, thereby maintaining the voltage difference between the scan electrode Y and the sustain electrode Z at 0V.

In this manner, the driving unit according to the present invention may alternately supply a sustain pulse swinging from the -Vs / 2 voltage to the Vs / 2 voltage to the scan electrode Y and the sustain electrode Z.

In particular, the driving unit according to the present invention for supplying the sustain pulse swinging from the -Vs / 2 voltage to the Vs / 2 voltage to the scan electrode (Y) and the sustain electrode (Z) as described above is a Vs / 2 voltage and such a Vs / 2 voltage. Since the -Vs / 2 voltage inverted from is used, the switching elements used do not have to have relatively high withstand voltage characteristics.

For example, assuming that the magnitude of the sustain voltage Vs is 200 V, the switching elements used in the driving unit according to the present invention may be Vs / 2, that is, withstand voltage characteristics that withstand 100V.

As a result, the manufacturing cost of the switching elements used can be lowered, which in turn reduces the manufacturing cost of the plasma display device.

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

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

As described in detail above, the plasma display device of the present invention generates and uses a sustain pulse that swings from the base voltage GND to the Vs voltage by using the Vs / 2 voltage supplied by the voltage source, thereby providing the switching elements used in the driver. It is effective to reduce the withstand voltage characteristics to reduce the overall manufacturing cost.

Claims (8)

A plasma display panel having scan electrodes and sustain electrodes formed thereon; The driving unit alternately supplies sustain pulses swinging at a width of the Vs voltage to a voltage of Vs / 2 supplied by a voltage source to the scan electrode and the sustain electrode. Plasma display device comprising a. The method of claim 1, The driving unit A first inductor unit; A first rising voltage supply unit supplying a voltage gradually rising to the scan electrode through the first inductor unit; A first voltage storage unit for storing a Vs / 2 voltage supplied by a voltage source; A first sustain voltage supply unit configured to supply a scan electrode with a sum of Vs / 2 voltage supplied by the voltage source and Vs / 2 voltage stored by the first voltage storage unit; A first falling voltage supply unit supplying a voltage gradually falling to the scan electrode through the first inductor unit; A first base voltage supply unit supplying a base voltage GND to the scan electrode; A second inductor unit; A second rising voltage supply unit supplying a voltage gradually rising to the scan electrode through the second inductor unit; A second voltage storage unit for storing a Vs / 2 voltage supplied by a voltage source; A second sustain voltage supply unit supplying a sum of the Vs / 2 voltage supplied by the voltage source and the Vs / 2 voltage stored by the second voltage storage unit to the sustain electrode; A second falling voltage supply unit supplying a voltage gradually falling to a scan electrode through the second inductor unit; And A second base voltage supply unit supplying a base voltage GND to the scan electrode; Plasma display device comprising a. The method of claim 2, And the second base voltage supply unit is in an on state while the sustain pulse supplied to the scan electrode swings with the width of the Vs voltage. The method of claim 2, And the first base voltage supply unit is in an on state while a sustain pulse supplied to the sustain electrode swings with a width of a voltage Vs. The method of claim 2, And the first and second voltage storage units include first and second voltage storage capacitors to store the Vs / 2 voltages. The method of claim 2, Between the first and second voltage storage unit and the voltage source for supplying the Vs / 2 voltage, the first and second reverse current prevention unit for preventing the voltage stored in the first and second voltage storage unit from falling toward the voltage source, respectively Plasma display device, characterized in that provided. The method of claim 2, The first clamping part and the second clamping part clamping an overvoltage generated in the first inductor part between the first inductor part and the ground GND and between the first inductor part and the first voltage storage part. Plasma display device, characterized in that provided. The method of claim 2, A third clamping part and a fourth clamping part clamping an overvoltage generated in the second inductor part between the second inductor part and the ground GND and between the second inductor part and the second voltage storage part. Plasma display device, characterized in that provided.

Images