KR100747206B1 - Plasma Display Apparatus and Driving Method thereof - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display device, and more particularly, to a plasma display device and a driving method thereof for controlling stable set-down discharge to ensure stable driving.

The plasma display device according to the present invention includes a plasma display panel including a scan electrode and a sustain electrode and a second slope different from the first slope after applying a first setdown pulse falling to the first slope to the scan electrode during the setdown period. And a scan driver for applying a falling second set-down pulse and a sustain driver for applying a positive bias voltage to the sustain electrode.

A driving method of a plasma display device according to the present invention is a driving method of a plasma display device in which a plurality of subfields are divided into a reset period, an address period, and a sustain period, respectively, and display an image in frame units in which the subfields are combined. The first setdown pulse descending to the first slope is applied to the scan electrode of the plasma display panel including the scan electrode and the sustain electrode during the second half of the setdown period, and then the second setdown pulse descending to the second slope different from the first slope is applied. And applying a positive bias voltage to the sustain electrode.

Description

Plasma Display Apparatus and Driving Method

1 is a perspective view showing the structure of a typical plasma display panel.

2 is a diagram illustrating a method of implementing image gradation of a conventional plasma display panel.

3 is a view showing a drive waveform of a conventional plasma display panel.

4 illustrates a plasma display device according to a first embodiment of the present invention.

5 is a view illustrating a driving waveform of the plasma display device according to the first embodiment of the present invention.

6 illustrates a plasma display device according to a second embodiment of the present invention.

7 illustrates a driving waveform of the plasma display device according to the second embodiment of the present invention.

8 is a diagram illustrating a plasma display device according to a third embodiment of the present invention.

9 illustrates driving waveforms of a plasma display device according to a third exemplary embodiment of the present invention.

10 illustrates a plasma display device according to a fourth embodiment of the present invention.

FIG. 11 illustrates driving waveforms of a plasma display device according to a fourth exemplary embodiment of the present invention. FIG.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display device, and more particularly, to a plasma display device and a driving method thereof for controlling stable set-down discharge to ensure stable driving.

In general, a plasma display panel forms a unit cell with a space between partition walls formed between a front substrate and a rear substrate, and each cell includes neon (Ne), helium (He), or a mixture of neon and helium (Ne +). A main discharge gas such as He) and an inert gas containing a small amount of xenon (Xe) are filled. When discharged by a high frequency voltage, the inert gas generates vacuum ultraviolet rays and emits phosphors formed between the partition walls to realize an image. Plasma display devices employing such plasma display panels have been spotlighted as next generation display devices because they can be made thin and light.

1 is a perspective view showing the structure of a typical plasma display panel.

As shown in FIG. 1, the plasma display panel is coupled in parallel with a front substrate 100, which is a display surface on which an image is displayed, and a rear substrate 110, which forms a rear surface, with a predetermined distance therebetween.

The front substrate 100 is based on the front glass 101, and scan electrodes 102 (Y electrodes) and sustain electrodes 103 (Z electrodes), that is, mutually discharged in one discharge cell and maintain light emission of the cells. The scan electrode 102 and the sustain electrode 103 formed of a transparent electrode a made of a transparent ITO material and a bus electrode b made of a metal material are formed in pairs. Scan electrode 102 and sustain electrode 103 are covered by one or more dielectric layers 104 that limit the discharge current and insulate the electrode pairs, and on top of dielectric layer 104 to facilitate discharge conditions. A protective layer 105 on which magnesium oxide (MgO) is deposited is formed.

The rear substrate 110 is arranged with the stripe-type (or well-type) partition walls 112 to form a plurality of discharge spaces, that is, discharge cells, based on the rear glass 111. In addition, a plurality of address electrodes 113 (X electrodes) for performing address discharge to generate vacuum ultraviolet rays are disposed in parallel with the partition wall 112. The upper surface of the rear substrate 110 is coated with R, G, B phosphors 114 that emit visible light for image display during address discharge. A white dielectric 115 is formed between the address electrode 113 and the phosphor 114 to protect the address electrode 113 and reflect the visible light emitted from the phosphor 114 to the front substrate 100.

A method of implementing gray levels of an image in such a plasma display panel will now be described with reference to FIG. 2.

2 is a diagram illustrating a method of implementing image grayscale of a conventional plasma display panel.

As shown in FIG. 2, the conventional plasma display panel performs time division driving by dividing one frame into several subfields having different number of emission times in order to realize gray level of an image. Each subfield is divided into a reset period for initializing the full screen, an address period for selecting a scan line and selecting a discharge cell in the selected scan line, and a sustain period for implementing gray levels according to the number of discharges. For example, when the image is to be displayed with 256 gray levels, the frame period (16.67 ms) corresponding to 1/60 second is divided into eight subfields SF1 to SF8. Each of the eight subfields SF1 to SF8 is divided into a reset period RP, an address period AP, and a sustain period SP as described above. In this case, while the reset period RP and the address period AP of each subfield are the same for each subfield, the sustain period and the number of sustain pulses allocated thereto are 2 ⁿ (n = 0,1,2) in each subfield. 3,4,5,6,7).

3 is a diagram illustrating a driving waveform of a conventional plasma display panel.

Referring to FIG. 3, each of the subfields SF has a reset period RP for initializing the discharge cells of the entire screen, an address period AP for selecting the discharge cells, and a sustain for maintaining the discharge of the selected discharge cells. It includes a period SP.

In the reset period RP, the rising ramp waveform PR is simultaneously applied to all the scan electrodes Y in the setup period SU. The rising ramp waveform PR causes a weak discharge (setup discharge) to occur in the cells of the entire screen, thereby generating wall charges in the cells. After the rising ramp waveform PR is applied in the set-down period SD, a predetermined slope from the positive sustain voltage Vs lower than the peak voltage of the rising ramp waveform PR to the negative scan voltage (-Vy) is given. The falling ramp waveform NR, which falls down, is applied to the scan electrodes Y simultaneously. The falling ramp waveform NR generates weak erase discharges in the cells, thereby eliminating unnecessary charges during wall charges and space charges generated by setup discharges, thereby uniformly retaining wall charges required for address discharges in the cells of the entire screen. .

In the address period AP, the negative scan pulse SCNP is sequentially applied to the scan electrodes Y, and the positive data pulse DP is applied to the address electrodes. As the voltage difference between the scan pulse SCNP and the data pulse DP and the wall voltage generated in the reset period RP are added, an address discharge is generated in the cell to which the data pulse DP is applied. Wall charges are generated in the cells selected by the address discharge.

On the other hand, a positive bias voltage Vzb is applied to the sustain electrodes Z during the set down period SD and the address period AP.

In the sustain period SP, the sustain pulse SUSP is applied to the scan electrodes Y and the sustain electrodes Z alternately. Then, the cell selected by the address discharge is in the form of surface discharge between the scan electrode Y and the sustain electrode Z whenever the sustain pulse SUSP is applied while the wall voltage and the sustain pulse SSUS in the cell are added. Sustain discharge, that is, display discharge for displaying an image, occurs.

In this way, the driving process of the plasma display panel in one subfield is completed.

In the driving process of the conventional plasma display panel, it is common to supply the fixed slope of the setdown pulse as one. However, by fixing the slope of the set-down pulse as one, it is difficult to control the wall charge during the set-down period, which adversely affects the entire subsequent driving process and ultimately destabilizes the entire driving process of the plasma display panel. There is a problem.

SUMMARY OF THE INVENTION An object of the present invention is to provide a plasma display device and a driving method thereof, which ensure stable driving by improving a wall charge control method during a set down period.

In order to solve the above technical problem, a plasma display device according to an exemplary embodiment of the present invention applies a plasma display panel including a scan electrode and a sustain electrode, and applies a first setdown pulse falling to the scan electrode with a first slope during the setdown period. And a scan driver for applying a second setdown pulse falling to a second slope different from the first slope and a sustain driver for applying a positive bias voltage to the sustain electrode.

The lowest voltage of the first setdown pulse and the highest voltage of the second setdown pulse are the same.

The second slope is larger than the first slope.

The minimum voltage of the first set-down pulse is characterized in that more than -50 volts + less than +50 volts.

The lowest voltage of the second set down pulse is equal to or higher than the lowest voltage of the scan pulse applied to the scan electrode during the address period.

The plasma display device according to the second embodiment of the present invention is different from the first slope after applying a first setdown pulse falling to the first slope to the scan electrode during the setdown period and the plasma display panel including the scan electrode and the sustain electrode. The first positive bias voltage is applied to the sustain electrode and the second setdown pulse is applied to the scan electrode while the first setdown pulse is applied to the scan driver and the scan electrode which applies the second setdown pulse falling to the second slope. And a sustain driver for applying a second positive bias voltage to the sustain electrode.

The lowest voltage of the first setdown pulse and the highest voltage of the second setdown pulse are the same.

The second slope is larger than the first slope.

The lowest voltage of the first set-down pulse is characterized in that more than -50 volts + +50 volts.

The lowest voltage of the second set down pulse is equal to or higher than the lowest voltage of the scan pulse applied to the scan electrode during the address period.

The second positive bias voltage is smaller than the first positive bias voltage.

The second positive bias voltage is larger than the first positive bias voltage.

A plasma display device according to a third embodiment of the present invention includes a plasma display panel including a scan electrode and a sustain electrode, a scan driver for applying a setdown pulse to the scan electrode at least three different inclinations during a setdown period; And a sustain driver for applying a positive bias voltage to the sustain electrode during the setdown period.

The slope of the setdown pulse is characterized by increasing from the first half to the second half of the setdown period.

The setdown pulse is characterized by maintaining the lowest voltage during the last part of the setdown period.

The period during which the setdown pulse maintains the lowest voltage is 5% or more and 20% or less of the setdown period.

The lowest voltage of the setdown pulse is equal to or higher than the lowest voltage of the scan pulse applied to the scan electrode during the address period.

A plasma display device according to a fourth embodiment of the present invention includes a plasma display panel including a scan electrode and a sustain electrode, a scan driver configured to apply a setdown pulse to the scan electrode at least three different inclinations during a setdown period; And a sustain driver for applying a positive bias voltage scaled according to the slope of the setdown pulse to the sustain electrode during the setdown period.

The slope of the setdown pulse is characterized by increasing from the first half to the second half of the setdown period.

The setdown pulse is characterized by maintaining the lowest voltage during the last part of the setdown period.

The period during which the setdown pulse maintains the lowest voltage is 5% or more and 20% or less of the setdown period.

The lowest voltage of the setdown pulse is equal to or higher than the lowest voltage of the scan pulse applied to the scan electrode during the address period.

The magnitude of the positive bias voltage is inversely proportional to the slope of the setdown pulse.

The magnitude of the positive bias voltage is characterized in direct proportion to the slope of the setdown pulse.

A driving method of a plasma display device according to a first embodiment of the present invention is a method of driving a plasma display device in which a plurality of subfields are divided into a reset period, an address period, and a sustain period, respectively, and display an image in frame units in which the subfields are combined. A method of applying a first setdown pulse, which descends at a first slope, to a scan electrode of a plasma display panel including a scan electrode and a sustain electrode during the second half of the reset period, and then descending at a second slope different from the first slope. And applying a two set down pulse and applying a positive bias voltage to the sustain electrode.

In the driving method of the plasma display device according to the second embodiment of the present invention, the plasma display device is driven in which a plurality of subfields are divided into a reset period, an address period, and a sustain period, respectively, and display an image in frame units in which the subfields are combined. A method comprising: applying a first setdown pulse descending at a first slope to a scan electrode of a plasma display panel including a scan electrode and a sustain electrode during a late setdown period of the reset period and then descending at a second slope different from the first slope; Applying a second setdown pulse and applying a first positive bias voltage to the sustain electrode while the first setdown pulse is applied to the scan electrode, and applying a second positive voltage to the sustain electrode while the second setdown pulse is applied to the scan electrode. And applying a polarity bias voltage.

In a driving method of a plasma display device according to a third embodiment of the present invention, a driving of a plasma display device in which a plurality of subfields is divided into a reset period, an address period, and a sustain period, respectively, and displays an image in units of frames in which the subfields are combined A method, comprising: applying a setdown pulse to the scan electrode of a plasma display panel including a scan electrode and a sustain electrode, the setdown pulse being lowered to at least three different slopes during the second setdown period of the reset period and the positive electrode to the sustain electrode during the setdown period. And applying a bias voltage.

In a driving method of a plasma display device according to a fourth embodiment of the present invention, a driving of a plasma display device in which a plurality of subfields is divided into a reset period, an address period, and a sustain period, respectively, and displays an image in units of frames in which the subfields are combined A method, comprising: applying a setdown pulse falling to at least three different slopes during a setdown period to a scan electrode of a plasma display panel including a scan electrode and a sustain electrode and depending on the slope of the setdown pulse during the setdown period to the sustain electrode; And applying a scaled positive bias voltage.

Hereinafter, a preferred embodiment of a plasma display device and a driving method thereof according to the present invention will be described in detail with reference to the accompanying drawings.

4 is a diagram illustrating a plasma display device according to a first embodiment of the present invention.

As shown in FIG. 4, in the plasma display device according to the first embodiment of the present invention, the address electrodes X1 to Xm, the scan electrodes Y1 to Yn, and the sustain electrode Z in the reset period, the address period, and the sustain period. A plasma display panel 400 expressing an image by generating a gas discharge in a discharge space containing an inert gas by applying a predetermined driving pulse to the N s) and address electrodes X1 to Xm formed on a rear panel (not shown). A data driver 41 for supplying data to the data, a scan driver 42 for driving the scan electrodes Y1 to Yn formed on the front panel (not shown), and a sustain electrode Z formed on the front panel (not shown). ), A sustain driver 43 for driving the driver, a timing controller 44 for controlling the drivers 41, 42, and 43, and a drive voltage generator for supplying a driving voltage to each of the drivers 41, 42, and 43. 45).

Hereinafter, functions and operations of the components of the plasma display device according to the first embodiment of the present invention will be described in detail.

First, although not shown, the plasma display panel 400 is bonded to the front panel (not shown) and the rear panel (not shown) at regular intervals with a discharge space including an inert gas therebetween. For example, the scan electrodes Y1 to Yn and the sustain electrode Z are formed in pairs, and on the rear panel, the address electrodes X1 to Y cross the scan electrodes Y1 to Yn and the sustain electrode Z. Xm) is formed.

The data driver 41 is subjected to inverse gamma correction and error diffusion by an inverse gamma correction circuit, an error diffusion circuit, and the like not shown, and then data mapped according to a subfield pattern preset by the subfield mapping circuit is supplied. The data driver 41 samples and latches data under the control of the timing controller 44, and then supplies the data to the address electrodes X1 to Xm.

The scan driver 42 applies a setup pulse that gradually rises to the scan electrodes Y1 to Yn during the setup period under the control of the timing controller 44. In addition, after applying the first setdown pulse falling to the first slope during the subsequent setdown period, the setdown pulse including the second setdown pulse falling to the second slope different from the first slope is applied to the scan electrodes Y1 to Yn. do.

In addition, the scan driver 42 supplies the scan electrodes Y1 to Yn to select a scan line during an address period after a reset waveform including a setup pulse and a set down pulse is supplied to the scan electrodes Y1 to Yn. Scan pulses that fall to the negative level are applied from the scan reference voltage Vsc and the scan reference voltage Vsc.

In addition, the scan driver 42 supplies a sustain pulse to the scan electrodes Y1 to Yn to allow sustain discharge to occur in the selected cell in the address period during the sustain period.

The sustain driver 43 supplies a bias voltage having a sustain voltage (Vs) level to the sustain electrode Z during the setdown period and the address period under the control of the timing controller 44, and then the scan driver 42 and the scan driver 42 during the sustain period. Alternatingly, a sustain pulse is supplied to the sustain electrode (Z).

The timing controller 44 receives the vertical / horizontal synchronization signal and generates timing control signals CTRX, CTRY, and CTRZ required for each driving unit, and outputs the timing control signals CTRX, CTRY, and CTRZ to the corresponding driving units 41, 42, and the like. Each drive unit 41, 42, 43 is controlled by supplying to 43). The timing control signal CTRX applied to the data driver 41 includes a sampling clock for sampling data, a latch control signal, an energy recovery circuit, and a switch control signal for controlling on / off time of the driving switch element. The timing control signal CTRY applied to the scan driver 42 includes an energy recovery circuit in the scan driver 42 and a switch control signal for controlling on / off time of the driving switch element. The timing control signal CTRZ applied to the sustain driver 43 includes a switch control signal for controlling the on / off time of the energy recovery circuit and the drive switch element in the sustain driver 43.

The driving voltage generation unit 45 includes each driving unit 41 and 42 including a sustain voltage Vs, a setup ramp voltage Vst, a scan reference voltage Vsc, a data voltage Va, a scan voltage (-Vy), and the like. And various driving voltages required by (43). These driving voltages may vary depending on the composition of the discharge gas or the structure of the discharge cell.

Hereinafter, the operation principle of the plasma display device according to the first embodiment of the present invention will be described in detail with reference to FIG. 5.

5 illustrates a driving waveform of the plasma display device according to the first embodiment of the present invention.

As shown in FIG. 5, the plasma display device according to the first embodiment of the present invention implements an image in a frame unit composed of a combination of a plurality of subfields, and one subfield SF initializes all cells. The driving period is divided into a reset period RP for performing the operation, an address period AP for selecting the cell to be discharged, and a sustain period SP for maintaining the discharge of the selected cell.

Hereinafter, the voltage applied to each period and its function will be described in detail.

First, in the reset period RP, the setup ramp pulse PR of the positive slope is simultaneously applied to all the scan electrodes Y1 to Yn in the setup period SU. The setup ramp pulse PR is an example of a setup waveform and may adopt various waveforms in a rising shape. This setup ramp pulse PR causes a weak dark discharge in the discharge cells of the entire screen. By this setup discharge, positive wall charges are accumulated on the address electrodes X1 to Xm and the sustain electrode Z, and negative wall charges are accumulated on the scan electrodes Y1 to Yn.

After the first set-down pulse NR1 falling at the first slope is simultaneously applied to all the scan electrodes Y1 to Yn during the first set-down period SD1 corresponding to the first half of the subsequent set-down period SD, the second half During the second set down period SD2 corresponding to the second set down pulse NR2 falling at the second slope different from the first slope to the scan electrodes Y1 to Yn simultaneously, the sustain electrode Z is applied simultaneously. When a bias voltage having a positive sustain voltage (Vs) level is applied, the positive wall charges of the address electrodes X1 to Xm are kept as they are, but are sustained through discharge between the sustain electrodes Z and the scan electrodes Y1 to Yn. The positive electrode wall charge of the electrode Z is erased by a certain amount, and the sustain electrode Z and the address electrodes X1 to Xm divide a large amount of the negative charge accumulated on the scan electrodes Y1 to Yn. At this time, the slope of the setdown pulse is differently adjusted before and after the setdown period SD to adjust the intensity of the setdown discharges before and after the setdown period SD, and thus, during the entire setdown period SD. The wall charge distribution in the discharge cell is more precisely controlled.

By this set down discharge, the wall charges such that the address discharge can stably occur remain uniformly in the cells.

Preferably, the lowest voltage V1 of the first setdown pulse NR1 and the highest voltage V1 of the second setdown pulse NR2 are the same. As such, by adjusting the lowest voltage V1 of the first setdown pulse NR1 and the highest voltage V1 of the second setdown pulse NR2 in the same manner, the voltage variation of the setdown pulse when the slope of the setdown pulse changes. This prevents the strong discharge, thereby improving the contrast ratio characteristics of the plasma display device.

It is preferable to make a 2nd inclination larger than a 1st inclination. As such, the second set-down period SD2 corresponding to the second half of the set-down period SD, rather than the slope of the first set-down pulse NR1 applied during the first set-down period SD1 corresponding to the first half of the set-down period SD, is applied. By slowing the slope of the second setdown pulse NR2 applied during the second setdown period SD2, the intensity of discharge during the second setdown period SD2 corresponding to the second half of the setdown period SD is weakened, and thus the contrast ratio of the plasma display device is reduced. Improve properties.

Preferably, the minimum voltage V1 of the first set-down pulse NR1 is equal to or greater than -50 volts and equal to or less than +50 volts. As such, by adjusting the level of the lowest voltage V1 of the first setdown pulse NR1 applied during the first setdown period SD1 corresponding to the first half of the setdown period SD, the setdown discharge is performed according to the driving environment of the plasma display panel. Adjust the intensity more precisely.

Preferably, the lowest voltage −Vy of the second set-down pulse NR2 is equal to or higher than the lowest voltage −Vy of the scan pulse SCNP applied to the scan electrode during the address period AP. As described above, the second setdown pulse (Vy) is made equal to the lowest voltage (-Vy) of the scan pulse SCNP applied to the scan electrode during the address period AP. NR2) and the supply voltage source of the scan pulse SCNP are common to reduce the manufacturing cost of the plasma display device. On the other hand, by setting the minimum voltage (-Vy) of the second set-down pulse NR2 higher than the minimum voltage (-Vy) of the scan pulse SCNP applied to the scan electrode during the address period AP, Adjust the intensity

Next, in the address period AP, the data pulse DP rising from the ground GND to the positive data voltage Va at the address electrodes X1 to Xm, and the scan reference voltages at the scan electrodes Y1 to Yn. When the scan pulse SCNP falling to the negative scan voltage (-Vy) at Vsc is applied in synchronization, the voltage difference between the address electrodes X1 to Xm and the scan electrodes Y1 to Yn, and the reset period RP ), An address discharge is generated as the wall voltage between the address electrodes X1 to Xm and the scan electrodes Y1 to Yn due to the wall charges formed during the above step is added.

On the other hand, the sustain electrode Z has a positive sustain voltage Vs level so as to reduce the voltage difference between the scan electrodes Y1 to Yn during the address period AP so that no misdischarge occurs with the scan electrodes Y1 to Yn. The bias voltage is supplied.

Next, in the sustain period SP, a sustain pulse SUSP that rises from the ground GND to the sustain voltage Vs is applied to the scan electrodes Y1 to Yn and the sustain electrode Z alternately. The cell selected by the address discharge has a sustain discharge, i.e., between the scan electrodes Y1 to Yn and the sustain electrode Z every time the sustain pulse SSUS is applied as the wall voltage and the sustain pulse SSUS in the cell are added. Display discharge occurs.

In this way, the driving process of the plasma display device according to the first embodiment of the present invention in one subfield is completed.

As described above in detail, the plasma display device according to the first exemplary embodiment of the present invention adjusts the slope of the set down pulse to more precisely adjust the wall charge distribution in the discharge cell during the set down period, thereby ensuring stable driving. , Improve the contrast ratio characteristics.

6 is a diagram illustrating a plasma display device according to a second embodiment of the present invention.

As shown in FIG. 6, in the plasma display device according to the second exemplary embodiment, the address electrodes X1 to Xm, the scan electrodes Y1 to Yn, and the sustain electrode Z in the reset period, the address period, and the sustain period. A plasma display panel 600 expresses an image by generating a gas discharge in a discharge space containing an inert gas by applying a predetermined driving pulse to the X-ray), and address electrodes X1 to Xm formed on a rear panel (not shown). A data driver 61 for supplying data to the data, a scan driver 62 for driving the scan electrodes Y1 to Yn formed on the front panel (not shown), and a sustain electrode Z formed on the front panel (not shown). ), A sustain driver 63 for driving the driver, a timing controller 64 for controlling the drivers 61, 62, and 63, and a drive voltage generator for supplying a drive voltage to the drivers 61, 62, and 63. 65).

Hereinafter, functions and operations of each component of the plasma display device according to the second embodiment of the present invention will be described in detail.

Although not shown, the plasma display panel 600 is bonded to the front panel (not shown) and the rear panel (not shown) at regular intervals with a discharge space including an inert gas therebetween. For example, the scan electrodes Y1 to Yn and the sustain electrode Z are formed in pairs, and on the rear panel, the address electrodes X1 to Y cross the scan electrodes Y1 to Yn and the sustain electrode Z. Xm) is formed.

The data driver 61 is subjected to inverse gamma correction and error diffusion by an inverse gamma correction circuit, an error diffusion circuit, and the like not shown, and then data mapped according to a subfield pattern preset by the subfield mapping circuit is supplied. The data driver 61 samples and latches data under the control of the timing controller 64, and then supplies the data to the address electrodes X1 to Xm.

The scan driver 62 applies a setup pulse that gradually rises to the scan electrodes Y1 to Yn during the setup period under the control of the timing controller 64. In addition, after applying the first setdown pulse falling to the first slope during the subsequent setdown period, the setdown pulse including the second setdown pulse falling to the second slope different from the first slope is applied to the scan electrodes Y1 to Yn. do.

In addition, the scan driver 62 supplies the scan electrodes Y1 to Yn to select the scan line during the address period after the reset waveform including the setup pulse and the set down pulse is supplied to the scan electrodes Y1 to Yn. Scan pulses that fall to the negative level are applied from the scan reference voltage Vsc and the scan reference voltage Vsc.

In addition, the scan driver 62 supplies a sustain pulse to the scan electrodes Y1 to Yn to allow sustain discharge to occur in the selected cell in the address period during the sustain period.

The sustain driver 63 supplies the first positive bias voltage to the sustain electrode Z while the first setdown pulse is applied to the scan electrodes Y1 to Yn during the setdown period under the control of the timing controller 64. After the second set-down pulse is applied to the scan electrodes Y1 to Yn and during the address period, the second positive bias voltage is supplied to the sustain electrode Z, and then alternately with the scan driver 62 during the sustain period. Operation is supplied to the sustain electrode Z.

The timing controller 64 receives a vertical / horizontal synchronization signal and generates timing control signals CTRX, CTRY, and CTRZ required for each driver, and transmits the timing control signals CTRX, CTRY, and CTRZ to the corresponding driver 61, 62, or the like. Each drive unit 61, 62, 63 is controlled by supplying the power to 63. The timing control signal CTRX applied to the data driver 61 includes a sampling clock for sampling data, a latch control signal, an energy recovery circuit, and a switch control signal for controlling on / off time of the driving switch element. The timing control signal CTRY applied to the scan driver 62 includes an energy recovery circuit in the scan driver 62 and a switch control signal for controlling on / off time of the driving switch element. The timing control signal CTRZ applied to the sustain driver 63 includes a switch control signal for controlling the on / off time of the energy recovery circuit and the driving switch element in the sustain driver 63.

The driving voltage generator 65 includes a sustain voltage Vs, a setup ramp voltage Vst, a scan reference voltage Vsc, a data voltage Va, a first positive bias voltage Vzb1, and a second positive bias voltage. Various driving voltages required by each of the driving units 61, 62, and 63 including Vzb2, scan voltage (-Vy), and the like are generated. These driving voltages may vary depending on the composition of the discharge gas or the structure of the discharge cell.

Hereinafter, the operation principle of the plasma display device according to the second embodiment of the present invention will be described in detail with reference to FIG. 7.

7 illustrates a driving waveform of the plasma display device according to the second embodiment of the present invention.

As shown in FIG. 7, the plasma display device according to the second embodiment of the present invention implements an image in a frame unit composed of a combination of a plurality of subfields, and one subfield SF initializes all cells. The driving period is divided into a reset period RP for performing the operation, an address period AP for selecting the cell to be discharged, and a sustain period SP for maintaining the discharge of the selected cell.

Hereinafter, the voltage applied to each period and its function will be described in detail.

First, in the reset period RP, the setup ramp pulse PR of the positive slope is simultaneously applied to all the scan electrodes Y1 to Yn in the setup period SU. The setup ramp pulse PR is an example of a setup waveform and may adopt various waveforms in a rising shape. This setup ramp pulse PR causes a weak dark discharge in the discharge cells of the entire screen. By this setup discharge, positive wall charges are accumulated on the address electrodes X1 to Xm and the sustain electrode Z, and negative wall charges are accumulated on the scan electrodes Y1 to Yn.

After the first set-down pulse NR1 falling at the first slope is simultaneously applied to all the scan electrodes Y1 to Yn during the first set-down period SD1 corresponding to the first half of the subsequent set-down period SD, the second half During the second set down period SD2 corresponding to the second set down pulse NR2 falling at the second slope different from the first slope to all the scan electrodes Y1 to Yn simultaneously, the scan electrodes Y1 are applied simultaneously. The first positive bias voltage is supplied to the sustain electrode Z while the first setdown pulse is applied to the first to second Yn, and the second setdown pulse is applied to the scan electrodes Y1 to Yn and sustained during the address period. The second positive bias voltage is supplied to the electrode Z. When such voltages are applied during the set-down period SD, the positive wall charges of the address electrodes X1 to Xm are maintained, but the sustain electrode Z is discharged through the discharge between the sustain electrode Z and the scan electrodes Y1 to Yn. The positive electrode wall charges are erased by a certain amount, and the sustain electrode Z and the address electrodes X1 to Xm divide a large amount of negative charges accumulated on the scan electrodes Y1 to Yn. At this time, the slope of the setdown pulses applied to the scan electrodes Y1 to Yn is differently adjusted before and after the setdown period SD, and the positive bias voltage supplied to the sustain electrode Z is adjusted during the setdown period SD. By controlling differently in the front and the second half of the control panel, the intensity of the setdown discharges in the front and second half of the setdown period SD is adjusted, and thus the wall charge distribution in the discharge cell during the whole setdown period SD is more precisely controlled. do.

By this set down discharge, the wall charges such that the address discharge can stably occur remain uniformly in the cells.

Preferably, the lowest voltage V2 of the first setdown pulse NR1 and the highest voltage V2 of the second setdown pulse NR2 are the same. As such, by adjusting the minimum voltage V2 of the first set-down pulse NR1 and the maximum voltage V2 of the second set-down pulse NR2 equally, the voltage fluctuation of the setdown pulse at the time when the slope of the setdown pulse changes. This prevents the strong discharge, thereby improving the contrast ratio characteristics of the plasma display device.

It is preferable to make a 2nd inclination larger than a 1st inclination. As described above, the second setdown period SD2 corresponding to the second half of the setdown period SD, rather than the slope of the first setdown pulse NR1 applied during the first setdown period SD1 corresponding to the first half of the setdown period SD, is applied. By smoothing the slope of the applied second setdown pulse NR2, the intensity of the discharge during the second setdown period SD2 corresponding to the second half of the setdown period SD is weakened, and thus the contrast ratio characteristic of the plasma display device is reduced. To improve.

Preferably, the minimum voltage V2 of the first set-down pulse NR1 is equal to or greater than -50 volts and equal to or less than +50 volts. As such, by adjusting the level of the lowest voltage V2 of the first setdown pulse NR1 applied during the first setdown period SD1 corresponding to the first half of the setdown period SD, the setdown discharge is performed according to the driving environment of the plasma display panel. Adjust the intensity more precisely

The minimum voltage (-Vy) of the second set-down pulse NR2 is preferably adjusted to be equal to or higher than the minimum voltage (-Vy) of the scan pulse SCNP applied to the scan electrode during the address period AP. As such, the second setdown pulse is adjusted by adjusting the lowest voltage (-Vy) of the second setdown pulse NR2 to be equal to the lowest voltage (-Vy) of the scan pulse SCNP applied to the scan electrode during the address period AP. The supply voltage source of the NR2 and the scan pulse SCNP are common to reduce the manufacturing cost of the plasma display device. On the other hand, by adjusting the minimum voltage (-Vy) of the second set-down pulse (NR2) higher than the minimum voltage (-Vy) of the scan pulse (SCNP) applied to the scan electrode during the address period (AP), the set-down discharge according to the driving environment Adjust the intensity of

The second positive bias voltage Vzb2 is preferably adjusted to be larger or smaller than the first positive bias voltage Vzb1. As such, the second positive bias voltage Vzb2 applied to the sustain electrode Z is applied to the first half of the setdown period SD during the second setdown period SD2 corresponding to the second half of the setdown period SD. The potential difference between the scan electrodes (Y1 to Yn) and the sustain electrode (Z) is supplied to the driving environment by controlling the supply voltage to be greater or smaller than the first positive bias voltage (Vzb1) applied to the sustain electrode (Z) during the set-down period (SD1). By adjusting accordingly, the intensity of the set-down discharge is adjusted to ensure more stable driving.

Next, in the address period AP, the data pulse DP rising from the ground GND to the positive data voltage Va at the address electrodes X1 to Xm, and the scan reference voltages at the scan electrodes Y1 to Yn. When the scan pulse SCNP falling to the negative scan voltage (-Vy) at Vsc is applied in synchronization, the voltage difference between the address electrodes X1 to Xm and the scan electrodes Y1 to Yn, and the reset period RP ), An address discharge is generated as the wall voltage between the address electrodes X1 to Xm and the scan electrodes Y1 to Yn due to the wall charges formed during the above step is added.

On the other hand, in the sustain electrode Z, the second positive bias voltage Vzb2 is applied to reduce the voltage difference from the scan electrodes Y1 to Yn during the address period AP so as to prevent erroneous discharge from the scan electrodes Y1 to Yn. Supplied.

Next, in the sustain period SP, a sustain pulse SSUS, which alternately rises from the ground GND to the sustain voltage Vs, is applied to the scan electrodes Y1 to Yn and the sustain electrode Z. The cell selected by the address discharge has a sustain discharge, i.e., between the scan electrodes Y1 to Yn and the sustain electrode Z every time the sustain pulse SSUS is applied as the wall voltage and the sustain pulse SSUS in the cell are added. Display discharge occurs.

In this way, the driving process of the plasma display device according to the second embodiment of the present invention in one subfield is completed.

As described above in detail, the plasma display device according to the second exemplary embodiment of the present invention discharges cells during the setdown period by adjusting the slope of the setdown pulse applied to the scan electrode and the bias voltage supplied to the sustain electrode during the setdown period. By more precisely adjusting the wall charge distribution in the inside, stable driving is ensured and contrast ratio characteristics are improved.

8 is a diagram illustrating a plasma display device according to a third embodiment of the present invention.

As shown in FIG. 8, in the plasma display device according to the third exemplary embodiment, the address electrodes X1 to Xm, the scan electrodes Y1 to Yn, and the sustain electrode Z in the reset period, the address period, and the sustain period. A plasma display panel 800 expresses an image by generating a gas discharge in a discharge space containing an inert gas by applying a predetermined driving pulse to the N s), and address electrodes X1 to Xm formed on a rear panel (not shown). A data driver 81 for supplying data to the data, a scan driver 82 for driving the scan electrodes Y1 to Yn formed on the front panel (not shown), and a sustain electrode Z formed on the front panel (not shown). ), A sustain driver 83 for driving the driver, a timing controller 84 for controlling the drivers 81, 82, and 83, and a drive voltage generator for supplying a driving voltage to each driver (81, 82, 83). 85).

Hereinafter, functions and operations of the components of the plasma display device according to the third embodiment of the present invention will be described in detail.

First, although not shown, the plasma display panel 800 is bonded to the front panel (not shown) and the rear panel (not shown) at regular intervals with a discharge space including an inert gas therebetween. For example, the scan electrodes Y1 to Yn and the sustain electrode Z are formed in pairs, and on the rear panel, the address electrodes X1 to Y cross the scan electrodes Y1 to Yn and the sustain electrode Z. Xm) is formed.

The data driver 81 is subjected to inverse gamma correction and error diffusion by an inverse gamma correction circuit, an error diffusion circuit, and the like not shown, and then data mapped according to a subfield pattern preset by the subfield mapping circuit is supplied. The data driver 81 samples and latches data under the control of the timing controller 84, and then supplies the data to the address electrodes X1 to Xm.

The scan driver 82 applies a setup pulse that gradually rises to the scan electrodes Y1 to Yn during the setup period under the control of the timing controller 84. In addition, a setdown pulse is applied to the scan electrodes Y1 to Yn, which drops to at least three different slopes during the subsequent setdown period.

In addition, the scan driver 82 supplies the scan electrodes Y1 to Yn to select a scan line during the address period after a reset waveform including a setup pulse and a set down pulse is supplied to the scan electrodes Y1 to Yn. Scan pulses that fall to the negative level are applied from the scan reference voltage Vsc and the scan reference voltage Vsc.

In addition, the scan driver 82 supplies a sustain pulse to the scan electrodes Y1 to Yn to enable sustain discharge to occur in the selected cell in the address period during the sustain period.

The sustain driver 83 supplies a bias voltage having a sustain voltage Vs level to the sustain electrode Z during the setdown period and the address period under the control of the timing controller 84, and then the scan driver 82 and the sustain driver 83 during the sustain period. Alternatingly, a sustain pulse is supplied to the sustain electrode (Z).

The timing controller 84 receives the vertical / horizontal synchronization signal and generates timing control signals CTRX, CTRY, and CTRZ required for each driver, and transmits the timing control signals CTRX, CTRY, and CTRZ to the corresponding driving units 81, 82, and the like. 83, the respective drive units 81, 82, 83 are controlled. The timing control signal CTRX applied to the data driver 81 includes a sampling clock for sampling data, a latch control signal, an energy recovery circuit, and a switch control signal for controlling on / off time of the driving switch element. The timing control signal CTRY applied to the scan driver 82 includes a switch control signal for controlling on / off time of the energy recovery circuit and the driving switch element in the scan driver 82. The timing control signal CTRZ applied to the sustain driver 83 includes an energy recovery circuit in the sustain driver 83 and a switch control signal for controlling on / off time of the driving switch element.

The driving voltage generator 85 includes each driving unit 81 and 82 including a sustain voltage Vs, a setup ramp voltage Vst, a scan reference voltage Vsc, a data voltage Va, a scan voltage (-Vy), and the like. And various driving voltages required by (83). These driving voltages may vary depending on the composition of the discharge gas or the structure of the discharge cell.

Hereinafter, the operation principle of the plasma display device according to the third embodiment of the present invention will be described in detail with reference to FIG. 9.

9 illustrates a driving waveform of the plasma display device according to the third embodiment of the present invention.

As shown in FIG. 9, the plasma display device according to the third embodiment of the present invention implements an image in a frame unit composed of a combination of a plurality of subfields, and one subfield SF initializes all cells. The driving period is divided into a reset period RP for performing the operation, an address period AP for selecting the cell to be discharged, and a sustain period SP for maintaining the discharge of the selected cell.

Hereinafter, the voltage applied to each period and its function will be described in detail.

First, in the reset period RP, the setup ramp pulse PR of the positive slope is simultaneously applied to all the scan electrodes Y1 to Yn in the setup period SU. The setup ramp pulse PR is an example of a setup waveform and may adopt various waveforms in a rising shape. This setup ramp pulse PR causes a weak dark discharge in the discharge cells of the entire screen. By this setup discharge, positive wall charges are accumulated on the address electrodes X1 to Xm and the sustain electrode Z, and negative wall charges are accumulated on the scan electrodes Y1 to Yn.

During the subsequent set-down period SD, all of the scan electrodes Y1 to Yn are simultaneously applied with a setdown pulse descending with at least three different inclinations, while a positive sustain voltage Vs level is applied to the sustain electrode Z. Is applied, the positive wall charges of the address electrodes X1 to Xm are maintained, but the positive wall charges of the sustain electrode Z are discharged through the discharge between the sustain electrode Z and the scan electrodes Y1 to Yn. And the sustain electrode Z and the address electrodes X1 to Xm divide a large amount of negative charges accumulated on the scan electrodes Y1 to Yn. In this case, by adjusting the slope of the setdown pulse to have at least three different values, the intensity of the setdown discharge is adjusted according to the slope of the setdown pulse, and accordingly, the wall charge distribution in the discharge cells during the entire setdown period SD is viewed. Finely adjusted.

By this set down discharge, the wall charges such that the address discharge can stably occur remain uniformly in the cells.

It is preferable that the slope of the setdown pulse increases from the first half to the second half of the setdown period SD. As the slope of the setdown pulse is gentle from the first half to the second half of the setdown period SD, the intensity of the setdown discharge at the second half of the setdown period SD is weakened, thereby improving the contrast ratio characteristic of the plasma display device. .

It is preferable that the setdown pulse maintain the lowest voltage during the last part of the setdown period, and the period during which the setdown pulse maintains the lowest voltage is preferably 5% or more and 20% or less of the entire setdown period. This stabilizes the final wall charge distribution in the setdown period.

The minimum voltage (-Vy) of the setdown pulse is preferably adjusted to be equal to or higher than the minimum voltage (-Vy) of the scan pulse SCNP applied to the scan electrode during the address period AP. By supplying the setdown pulse and the scan pulse SCNP by making the minimum voltage (-Vy) of the setdown pulse equal to the minimum voltage (-Vy) of the scan pulse SCNP applied to the scan electrode during the address period AP as described above. The common use of the voltage source reduces the manufacturing cost of the plasma display device. On the other hand, by setting the minimum voltage (-Vy) of the setdown pulse higher than the minimum voltage (-Vy) of the scan pulse SCNP applied to the scan electrode during the address period AP, the intensity of the setdown discharge is adjusted according to the driving environment.

Next, in the address period AP, the data pulse DP rising from the ground GND to the positive data voltage Va at the address electrodes X1 to Xm, and the scan reference voltages at the scan electrodes Y1 to Yn. When the scan pulse SCNP falling to the negative scan voltage (-Vy) at Vsc is applied in synchronization, the voltage difference between the address electrodes X1 to Xm and the scan electrodes Y1 to Yn, and the reset period RP ), An address discharge is generated as the wall voltage between the address electrodes X1 to Xm and the scan electrodes Y1 to Yn due to the wall charges formed during the second charge is added.

On the other hand, the sustain electrode Z has a positive sustain voltage Vs level so as to reduce the voltage difference between the scan electrodes Y1 to Yn during the address period AP so that no misdischarge occurs with the scan electrodes Y1 to Yn. The bias voltage is supplied.

Next, in the sustain period SP, a sustain pulse SUSP that rises from the ground GND to the sustain voltage Vs is applied to the scan electrodes Y1 to Yn and the sustain electrode Z alternately. The cell selected by the address discharge has a sustain discharge, i.e., between the scan electrodes Y1 to Yn and the sustain electrode Z every time the sustain pulse SSUS is applied as the wall voltage and the sustain pulse SSUS in the cell are added. Display discharge occurs.

In this way, the driving process of the plasma display device according to the third exemplary embodiment of the present invention in one subfield is completed.

As described above in detail, the plasma display device according to the third embodiment of the present invention adjusts the slope of the set down pulse to more precisely adjust the wall charge distribution in the discharge cells during the set down period, thereby ensuring stable driving. , Improve the contrast ratio characteristics.

10 is a diagram illustrating a plasma display device according to a fourth embodiment of the present invention.

As shown in FIG. 10, in the plasma display device according to the fourth exemplary embodiment, the address electrodes X1 to Xm, the scan electrodes Y1 to Yn, and the sustain electrode Z in the reset period, the address period, and the sustain period. A plasma display panel 1000 expresses an image by generating a gas discharge in a discharge space containing an inert gas by applying a predetermined driving pulse to the N s), and address electrodes X1 to Xm formed on a rear panel (not shown). A data driver 1001 for supplying data to the data, a scan driver 1002 for driving the scan electrodes Y1 to Yn formed on the front panel (not shown), and a sustain electrode Z formed on the front panel (not shown). ), A sustain driver 1003 for driving the driver, a timing controller 1004 for controlling the drivers 1001, 1002, and 1003, and a drive voltage generator for supplying driving voltages to the drivers 1001, 1002 and 1003. 1005).

Hereinafter, functions and operations of each component of the plasma display device according to the fourth embodiment of the present invention will be described in detail.

First, although not shown, the plasma display panel 1000 is bonded to the front panel (not shown) and the rear panel (not shown) at regular intervals with a discharge space including an inert gas therebetween. For example, the scan electrodes Y1 to Yn and the sustain electrode Z are formed in pairs, and on the rear panel, the address electrodes X1 to Y cross the scan electrodes Y1 to Yn and the sustain electrode Z. Xm) is formed.

The data driver 1001 performs inverse gamma correction and error diffusion by an inverse gamma correction circuit, an error diffusion circuit, and the like which are not shown, and then data mapped according to a subfield pattern preset by the subfield mapping circuit is supplied. The data driver 1001 samples and latches data under the control of the timing controller 1004, and then supplies the data to the address electrodes X1 to Xm.

The scan driver 1002 applies a setup pulse that gradually rises to the scan electrodes Y1 to Yn during the setup period under the control of the timing controller 1004. In addition, a setdown pulse is applied to the scan electrodes Y1 to Yn, which drops to at least three different slopes during the subsequent setdown period.

In addition, the scan driver 1002 may be configured to scan electrodes Y1 to Yn to select a scan line during an address period after a reset waveform including a setup pulse and a set down pulse is supplied to the scan electrodes Y1 to Yn. Scan pulses that fall to the negative level are applied from the scan reference voltage Vsc and the scan reference voltage Vsc.

In addition, the scan driver 1002 supplies a sustain pulse to the scan electrodes Y1 to Yn to allow sustain discharge to occur in the selected cell in the address period during the sustain period.

The sustain driver 1003 supplies the positive electrode bias voltages whose magnitude is adjusted according to the slope of the setdown pulse applied to the scan electrodes Y1 to Yn during the setdown period under the control of the timing controller 1004. do. In addition, the positive bias voltage is supplied to the sustain electrode Z during the address period, and then alternately operates with the scan driver 1002 during the sustain period to supply the sustain pulse Z to the sustain electrode Z.

The timing controller 1004 receives a vertical / horizontal synchronization signal and generates timing control signals CTRX, CTRY, and CTRZ required for each driver, and transmits the timing control signals CTRX, CTRY, and CTRZ to the corresponding driving units 1001, 1002, Each driving unit 1001, 1002, 1003 is controlled by supplying the same to 1003). The timing control signal CTRX applied to the data driver 1001 includes a sampling clock for sampling data, a latch control signal, an energy recovery circuit, and a switch control signal for controlling on / off time of the driving switch element. The timing control signal CTRY applied to the scan driver 1002 includes an energy recovery circuit in the scan driver 1002 and a switch control signal for controlling on / off time of the driving switch element. The timing control signal CTRZ applied to the sustain driver 1003 includes a switch control signal for controlling the on / off time of the energy recovery circuit and the drive switch element in the sustain driver 1003.

The driving voltage generator 1005 includes a sustain voltage Vs, a setup ramp voltage Vst, a scan reference voltage Vsc, a data voltage Va, and positive bias voltages Vzb1, Vzb2, Vzb3, and Vzb4. Various driving voltages required by each of the driving units 1001, 1002, and 1003 including the voltage (−Vy) are generated. These driving voltages may vary depending on the composition of the discharge gas or the structure of the discharge cell.

Hereinafter, the operation principle of the plasma display device according to the fourth embodiment of the present invention will be described in detail with reference to FIG. 11.

11 illustrates a driving waveform of the plasma display device according to the fourth embodiment of the present invention.

As shown in FIG. 11, the plasma display device according to the fourth embodiment of the present invention implements an image in a frame unit composed of a combination of a plurality of subfields, and each of the subfields SF initializes all cells. The driving period is divided into a reset period RP for performing the operation, an address period AP for selecting the cell to be discharged, and a sustain period SP for maintaining the discharge of the selected cell.

Hereinafter, the voltage applied to each period and its function will be described in detail.

First, in the reset period RP, the setup ramp pulse PR of the positive slope is simultaneously applied to all the scan electrodes Y1 to Yn in the setup period SU. The setup ramp pulse PR is an example of a setup waveform and may adopt various waveforms in a rising shape. This setup ramp pulse PR causes a weak dark discharge in the discharge cells of the entire screen. By this setup discharge, positive wall charges are accumulated on the address electrodes X1 to Xm and the sustain electrode Z, and negative wall charges are accumulated on the scan electrodes Y1 to Yn.

During the subsequent set down period SD, all of the scan electrodes Y 1 through Y n are simultaneously applied with a set down pulse that descends with at least three different inclinations, while the scan electrodes Y 1 through Y n are applied during the set down period SD. The positive bias voltages Vzb1, Vzb2, Vzb3, and Vzb4, which are adjusted in size according to the slope of the setdown pulse applied to the (), are applied to the sustain electrode Z. When such voltages are applied during the set-down period SD, the positive wall charges of the address electrodes X1 to Xm are maintained, but the sustain electrode Z is discharged through the discharge between the sustain electrode Z and the scan electrodes Y1 to Yn. The positive electrode wall charges are erased by a certain amount, and the sustain electrode Z and the address electrodes X1 to Xm divide a large amount of negative charges accumulated on the scan electrodes Y1 to Yn. At this time, the slope of the setdown pulse applied to the scan electrodes (Y1 to Yn) is adjusted to have at least three different values, and the magnitude of the positive bias voltage applied to the sustain electrode (Z) is adjusted to the slope of the setdown pulse. By adjusting and supplying accordingly, the intensity of the setdown discharge is controlled and thus the wall charge distribution in the discharge cell during the entire setdown period SD is more precisely controlled.

By this set down discharge, the wall charges such that the address discharge can stably occur remain uniformly in the cells.

It is preferable to adjust the slope of the setdown pulse to increase from the first half to the second half of the setdown period SD. As the slope of the setdown pulse is gentle from the first half to the second half of the setdown period SD, the intensity of the setdown discharge at the second half of the setdown period SD is weakened, thereby improving the contrast ratio characteristic of the plasma display device. .

It is preferable that the setdown pulse maintain the lowest voltage during the last part of the setdown period SD, and the period during which the setdown pulse maintains the lowest voltage is preferably 5% or more and 20% or less of the entire setdown period SD. . In this way, the final wall charge distribution in the setdown period SD is stabilized.

The minimum voltage (-Vy) of the setdown pulse is preferably adjusted to be equal to or higher than the minimum voltage (-Vy) of the scan pulse SCNP applied to the scan electrode during the address period AP. By supplying the setdown pulse and the scan pulse SCNP by making the minimum voltage (-Vy) of the setdown pulse equal to the minimum voltage (-Vy) of the scan pulse SCNP applied to the scan electrode during the address period AP as described above. The common use of the voltage source reduces the manufacturing cost of the plasma display device. On the other hand, by setting the minimum voltage (-Vy) of the setdown pulse higher than the minimum voltage (-Vy) of the scan pulse SCNP applied to the scan electrode during the address period AP, the intensity of the setdown discharge is adjusted according to the driving environment.

The magnitude of the positive bias voltage is preferably adjusted to be inversely or directly proportional to the slope of the setdown pulse. In this way, the potential difference between the scan electrodes Y1 to Yn and the sustain electrode Z is appropriately adjusted according to the driving environment to adjust the intensity of the setdown discharge, thereby ensuring more stable driving.

Next, in the address period AP, the data pulse DP rising from the ground GND to the positive data voltage Va at the address electrodes X1 to Xm, and the scan reference voltages at the scan electrodes Y1 to Yn. When the scan pulse SCNP falling to the negative scan voltage (-Vy) at Vsc is applied in synchronization, the voltage difference between the address electrodes X1 to Xm and the scan electrodes Y1 to Yn, and the reset period RP ), An address discharge is generated as the wall voltage between the address electrodes X1 to Xm and the scan electrodes Y1 to Yn due to the wall charges formed during the above step is added.

On the other hand, the positive electrode bias voltage is supplied to the sustain electrode Z so as to reduce the voltage difference from the scan electrodes Y1 to Yn during the address period AP so that erroneous discharge with the scan electrodes Y1 to Yn does not occur.

Next, in the sustain period SP, a sustain pulse SUSP that rises from the ground GND to the sustain voltage Vs is applied to the scan electrodes Y1 to Yn and the sustain electrode Z alternately. The cell selected by the address discharge has a sustain discharge between the scan electrodes Y1 to Yn and the sustain electrode Z every time the sustain pulse SUSP is applied as the wall voltage and the sustain pulse SSUS in the cell are added. , Display discharge occurs.

In this way, the driving process of the plasma display device according to the fourth embodiment of the present invention in one subfield is completed.

As described above in detail, the plasma display device according to the fourth embodiment of the present invention discharges cells during the setdown period by adjusting the slope of the setdown pulse applied to the scan electrode and the bias voltage supplied to the sustain electrode during the setdown period. By more precisely adjusting the wall charge distribution in the inside, stable driving is ensured and contrast ratio characteristics are improved.

Since the driving method of the plasma display device according to the first to fourth embodiments of the present invention is driven under the same principle as the plasma display device according to the first to fourth embodiments of the present invention described above in detail, The description of the plasma display device according to the first to fourth embodiments is replaced.

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 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 construed as being included in the scope of the present invention.

As described in detail above, the present invention provides a plasma display device and a method of driving the same, which improve the wall charge control method during the setdown period, ensure stable driving, and improve contrast ratio characteristics.

Claims (28)

delete delete delete delete delete A plasma display panel including a scan electrode and a sustain electrode; A scan driver configured to apply a first setdown pulse falling to a first slope for a set down period to the scan electrode and then apply a second setdown pulse falling to a second slope greater than the first slope; And The first positive bias voltage is applied to the sustain electrode while the first setdown pulse is applied to the scan electrode during the set down period, and the second sustain electrode is applied to the sustain electrode while the second setdown pulse is applied to the scan electrode. And a sustain driver for applying a positive bias voltage. The method of claim 6, And the lowest voltage of the first setdown pulse is the same as the highest voltage of the second setdown pulse. delete The method of claim 6, And a minimum voltage of the first set down pulse is -50 volts or more and +50 volts or less. The method according to any one of claims 6, 7, or 9, And the lowest voltage of the second set down pulse is equal to or higher than the lowest voltage of a scan pulse applied to the scan electrode during an address period. The method of claim 10, And the second positive bias voltage is smaller than the first positive bias voltage. The method of claim 10, And the second positive bias voltage is greater than the first positive bias voltage. delete delete delete delete delete A plasma display panel including a scan electrode and a sustain electrode; A scan driver configured to apply a setdown pulse to the scan electrode which is lowered by at least three different inclinations during the setdown period; And A sustain driver configured to apply a positive bias voltage whose magnitude is adjusted according to a slope of the setdown pulse to the sustain electrode during the setdown period, And the slope of the setdown pulse increases from the first half to the second half of the setdown period. delete The method of claim 18, And the setdown pulse maintains the lowest voltage during the last partial period of the setdown period. The method of claim 20, And the period during which the setdown pulse maintains the lowest voltage is 5% or more and 20% or less of the setdown period. The method of claim 21, And the lowest voltage of the setdown pulse is equal to or higher than the lowest voltage of a scan pulse applied to the scan electrode during an address period. The method according to any one of claims 18, 20, 21, or 22, The magnitude of the positive bias voltage is inversely proportional to the slope of the setdown pulse. The method according to any one of claims 18, 20, 21, or 22, And the magnitude of the positive bias voltage is directly proportional to the slope of the setdown pulse. delete A driving method of a plasma display device, wherein a plurality of subfields are divided into a reset period, an address period, and a sustain period, respectively, and display an image in units of frames in which the subfields are combined. Applying a first setdown pulse falling to a first slope during the second setdown period of the reset period to the scan electrode of the plasma display panel including the scan electrode and the sustain electrode and then descending to a second slope greater than the first slope. Applying two setdown pulses; And The first positive bias voltage is applied to the sustain electrode while the first setdown pulse is applied to the scan electrode, and the second positive bias voltage is applied to the sustain electrode while the second setdown pulse is applied to the scan electrode. And driving the plasma display device. delete A driving method of a plasma display device, wherein a plurality of subfields are divided into a reset period, an address period, and a sustain period, respectively, and display an image in units of frames in which the subfields are combined. Applying a setdown pulse to the scan electrode of the plasma display panel including the scan electrode and the sustain electrode, the setdown pulse falling at least three different inclinations during the setdown period; And Applying a positive bias voltage scaled according to the slope of the setdown pulse to the sustain electrode during the setdown period, And the slope of the setdown pulse increases from the first half to the second half of the setdown period.

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