KR100740109B1 - Driving method of plasma display - Google Patents

Abstract

In the plasma display device, a plurality of first electrodes, a plurality of second electrodes, and a plurality of third electrodes are formed in a direction crossing the first electrode and the second electrode. And a plurality of discharge cells are defined by each of the first electrodes, the second electrodes, and the third electrodes, and the plurality of third electrodes are first groups and seconds defining discharge cells of a first color. It consists of a plurality of groups including at least a second group defining a discharge cell of color. In this case, sustain discharge pulses are alternately applied to at least one of the first and second electrodes of the plurality of discharge cells in the sustain period. The second voltage is applied after the second period when the first voltage is applied to the third electrode of the first group and the first voltage is applied to the third electrode of the first group during the first period of the sustain period. The first voltage is applied to the third electrode of the group.

PDP, Electrode, Discharge, Retention Period, Wall Charge, Discharge Cell, Phosphor

Description

Driving method of plasma display device {DRIVING METHOD OF PLASMA DISPLAY}

1 is a diagram illustrating a plasma display device according to an exemplary embodiment of the present invention.

2 and 3 are diagrams illustrating driving waveforms of the plasma display device according to the first and second exemplary embodiments of the present invention, respectively.

4 shows the wall charge state of each electrode after the address period ends.

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

The present invention relates to a method of driving a plasma display device.

The plasma display device is a display device using a plasma display panel that displays text or an image by using plasma generated by gas discharge. In the plasma display panel, dozens to millions or more pixels (discharge cells) are arranged in a matrix form according to their size.

The display panel of the plasma display device is driven by dividing one frame into a plurality of subfields having respective weights, and gray scales are displayed by a combination of weights of subfields in which a display operation occurs among the plurality of subfields. In the address period of each subfield, scan pulses are sequentially applied to the plurality of scan electrodes, and address pulses are applied to the address electrodes. At this time, in the discharge cells to which the scan pulse and the address pulse are simultaneously applied, the discharge cells to emit light and the discharge cells to not emit light are selected. In such an address period, positive wall charges are formed on the scan electrode and negative wall charges are formed on the sustain electrode and the address electrode by the address discharge.

In the sustain period, a sustain discharge pulse having a high level voltage (for example, a Vs voltage) and a low level voltage (for example, 0 V) is applied in opposite phases to the scan electrode and the sustain electrode to discharge the selected light. The cells are sustained and discharged for a period corresponding to the weight of the subfield to display an image. In this sustain period, when the Vs voltage is applied to the scan electrode and the 0 V voltage is applied to the sustain electrode and the address electrode, the discharge between the scan electrode and the address electrode may occur before the discharge between the scan electrode and the sustain electrode. When discharge between the scan electrode and the address electrode occurs first in the sustain period, more positive wall charges are formed in the address electrode than in the sustain electrode. Then, when the 0V voltage is applied to the scan electrode and the Vs voltage is applied to the sustain electrode, the sustain discharge may not occur well between the scan electrode and the sustain electrode.

An object of the present invention is to provide a method of driving a plasma display device that can stably generate sustain discharge in a sustain period.

According to one feature of the invention, a plurality of first electrodes and a plurality of second electrodes, a plurality of third electrodes formed in a direction crossing the first electrode and the second electrode, and each of the first electrodes and the respective agents A plurality of discharge cells defined by a second electrode and each of the third electrodes, each of the plurality of third electrodes defining a first group defining a discharge cell of a first color and a discharge cell of a second color A driving method of a plasma display device including a plurality of groups including at least a second group is provided. The driving method alternately applies sustain discharge pulses to at least one of the first and second electrodes of the plurality of discharge cells in a sustain period, and during a first period of the sustain period, a first group Applying a first voltage to a third electrode of the second electrode; and applying a second voltage lower than the first voltage to the third electrode of the second group.

Further, according to another feature of the invention, a plurality of first electrodes and a plurality of second electrodes, a plurality of third electrodes formed in a direction crossing the first electrode and the second electrode and each of the first electrode and the angle A plurality of discharge cells defined by a second electrode and each of the third electrodes, respectively, wherein the plurality of third electrodes define a first group, a discharge cell of a second color, which defines a discharge cell of a first color A driving method of a plasma display device including a plurality of groups including at least a second group is provided. The driving method alternately applies sustain discharge pulses to at least one of the first and second electrodes of the plurality of discharge cells in a sustain period, and during a first period of the sustain period, a first group Applying a first voltage to a third electrode of the first electrode and applying the first voltage to the third electrode of the second group after a second period when the first voltage is applied to the third electrode of the first group. Steps.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification. In addition, when a part is said to "include" a certain component, this means that it may further include other components, except to exclude other components unless otherwise stated.

In addition, the wall charge in the present invention refers to a charge formed close to each electrode on the wall (eg, the dielectric layer) of the cell. And the wall charge is not actually in contact with the electrode itself, but is described here as “formed”, “accumulated” or “stacked” on the electrode. In addition, the wall voltage refers to the potential difference formed in the wall of the cell by the wall charge.

A plasma display device according to an exemplary embodiment of the present invention will be described in detail with reference to FIG. 1.

1 is a diagram illustrating a plasma display device according to an exemplary embodiment of the present invention.

As shown in FIG. 1, a plasma display device according to an exemplary embodiment of the present invention includes a plasma display panel 100, a controller 200, an address electrode driver 300, a scan electrode driver 400, and a sustain electrode driver 500. It includes.

The plasma display panel 100 includes a plurality of address electrodes (hereinafter referred to as “A electrodes”) A1 to Am extending in the column direction, and a plurality of sustain electrodes extending in pairs to each other in the row direction (hereinafter, “X”). Electrodes ”(X1 to Xn) and scan electrodes (hereinafter referred to as“ Y electrodes ”) (Y1 to Yn). In general, the X electrodes X1 to Xn are formed corresponding to the respective Y electrodes Y1 to Yn, and the display for displaying images in the sustain period between the X electrodes X1 to Xn and the Y electrodes Y1 to Yn. Perform the action. The Y electrodes Y1 to Yn and the X electrodes X1 to Xn are arranged to be orthogonal to the A electrodes A1 to Am. At this time, the discharge space at the intersection of the A electrodes A1 to Am and the X and Y electrodes X1 to Xn and Y1 to Yn forms the cell 12. In addition, a dielectric layer (not shown) is formed covering the A electrodes A1 to Am, a fluorescent layer (not shown) is formed on the dielectric layer (not shown), and red (R) is formed in each of the cells 12. ), Green (G) and blue (B) fluorescent layers (not shown) are formed to determine the color of the cell 12. The structure of the plasma display panel 100 is an example, and a panel having another structure to which the driving waveform described below may be applied may also be applied to the present invention.

The controller 200 receives an image signal from the outside and outputs an A electrode driving control signal, an X electrode driving control signal, and a Y electrode driving control signal. The controller 200 divides and drives one frame into a plurality of subfields.

The address electrode driver 300 receives an A electrode driving control signal from the controller 200 and applies a display data signal for selecting a discharge cell to be displayed to each A electrode.

The scan electrode driver 400 receives a Y electrode driving control signal from the controller 200 and applies a driving voltage to the Y electrode.

The sustain electrode driver 500 receives the X electrode driving control signal from the controller 200 and applies a driving voltage to the X electrode.

Next, a driving waveform of the plasma display device according to an exemplary embodiment of the present invention will be described in detail with reference to FIG. 2. In the following description, only the driving waveforms applied to the Y electrode, the X electrode, and the A electrode forming one cell will be described.

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

As shown in Fig. 2, in the rising period of the reset period, the voltage of the Y electrode gradually increases from the voltage Vs to the voltage Vset while the X electrode is held at the reference voltage (0 V voltage in Fig. 2). In FIG. 2, the voltage of the Y electrode is shown to increase in the form of a lamp. Then, while the voltage of the Y electrode is increased, a weak discharge (hereinafter referred to as “weak discharge”) occurs between the Y electrode and the X electrode and between the Y electrode and the A electrode, and a negative wall charge is applied to the Y electrode. And a positive wall charge is formed on the X and A electrodes.

In the falling period of the reset period, the voltage of the Y electrode gradually decreases from the Vs voltage to the Vnf voltage while the X electrode is maintained at the Ve voltage. Then, while the voltage of the Y electrode decreases, a weak discharge occurs between the Y electrode and the X electrode, and between the Y electrode and the A electrode, and the negative wall charges formed on the Y electrode and the positive wall charges formed on the X electrode and the A electrode. Is erased. In general, the magnitude of the (Vnf-Ve) voltage is set near the discharge start voltage between the Y electrode and the X electrode. As a result, the wall voltage between the Y electrode and the X electrode becomes almost 0 V, whereby a cell that does not have an address discharge in the address period can be prevented from being erroneously discharged in the sustain period.

In the address period, in order to select a discharge cell to be turned on, a scan pulse having a VscL voltage is sequentially applied to a plurality of Y electrodes while maintaining the voltage of the X electrode at a Ve voltage. At this time, an address pulse having a Va voltage is applied to the A electrode passing through the discharge cell to be selected from the plurality of discharge cells formed by the Y electrode and the X electrode to which the VscL voltage is applied. Then, an address discharge occurs between the A electrode to which the Va voltage is applied and the Y electrode to which the VscL voltage is applied, and the Y electrode to which the VscL voltage is applied, and the X electrode to which the Ve voltage is applied, thereby causing a positive wall charge, A, to the Y electrode. Negative wall charges are formed on the electrode and the X electrode, respectively. A VscH voltage higher than the VscL voltage is applied to the Y electrode to which the VscL voltage is not applied, and a reference voltage is applied to the A electrode to which the Va voltage is not applied.

In order to perform this operation in the address period, the scan electrode driver 400 selects a Y electrode to which a scan pulse having a VscL voltage is applied among the Y electrodes Y1 to Yn. For example, in a single drive, the Y electrodes can be selected in the order arranged in the vertical direction. When one Y electrode is selected, the address electrode driver 300 selects a discharge cell to be turned on among discharge cells formed by the corresponding Y electrode. That is, the address electrode driver 300 selects a cell to which an address pulse having a Va voltage is applied among the A electrodes A1 to Am. Specifically, first, a scan pulse is applied to the Y electrode of the first row (Y1 in FIG. 1) and an address pulse is applied to the A electrode located in the cell to be turned on in the first row. Then, a discharge occurs between the Y electrode of the first row and the A electrode to which the address pulse is applied, thereby forming positive wall charges on the Y electrode and negative wall charges on the A and X electrodes, respectively. As a result, the wall voltage Vwxy is formed between the Y electrode and the X electrode so that the potential of the Y electrode is high with respect to the potential of the X electrode. Subsequently, while a scan pulse is applied to the Y electrode (Y2 of FIG. 1) in the second row, an address pulse is applied to the A electrode located in the cell to be turned on in the second row. Then, an address discharge occurs in the cell formed by the A electrode to which the address pulse is applied and the Y electrode in the second row, thereby forming wall charges in the cell. Similarly, an address pulse is applied to the A electrode positioned in the cell to be turned on while the scan pulse is sequentially applied to the Y electrodes of the remaining rows, thereby forming wall charges in the corresponding cell.

In the sustain period, sustain discharge pulses having a high level voltage (Vs voltage in FIG. 2) and a low level voltage (0V voltage in FIG. 2) are alternately applied to the Y electrode and the X electrode in the opposite phase. That is, 0 V is applied to the X electrode when the Vs voltage is applied to the Y electrode, and 0 V is applied to the Y electrode when the Vs voltage is applied to the X electrode. The Va1 voltage is applied to the A electrode in the initial period of the sustain period (for example, the period in which the first Vs voltage is applied to the Y electrode). At this time, when the Va voltage is used as the Va1 voltage, it is not necessary to form an additional power source for supplying the Va1 voltage. Then, sustain discharge occurs between the Y electrode and the X electrode by the wall voltage and the Vs voltage formed between the Y electrode and the X electrode by the address discharge, and the voltage difference (Vs-Va) between the Y electrode and the A electrode is reduced to Y. No discharge occurs between the electrode and the A electrode. When discharge occurs only between the Y electrode and the X electrode in the initial period of the sustain period, more positive wall charges are formed on the X electrode than the A electrode, so that a reference voltage is applied to the A electrode in a subsequent period. No discharge occurs between the Y electrode and the A electrode.

Thereafter, the process of applying the sustain discharge pulse to the Y electrode and the X electrode is repeated a number of times corresponding to the weight indicated by the corresponding subfield.

In general, a red (R), green (G), and blue (B) fluorescent layer covering the A electrode is disposed between the A and Y electrodes of the red (R), green (G), and blue (B) discharge cells. The discharge characteristics are different. Therefore, in the second embodiment of the present invention, as shown in FIG. 3, the voltage applied to the A electrode in the sustain period is changed according to the discharge characteristics of the red (R), green (G), and blue (B) discharge cells. .

3 illustrates a driving waveform of the plasma display device according to the second exemplary embodiment of the present invention. In FIG. 3, it is assumed that the red (R) and green (G) phosphors discharge better than the blue (B) phosphors.

As shown in Fig. 3, in the initial period of the sustain period, Va1 voltage is applied to the A electrodes A _R and A _G of the red (R) and green (G) discharge cells, and the A electrode of the blue (B) discharge cells. A reference voltage is applied to A _B. Specifically, wall charges are formed in each electrode as shown in FIG. 4 by the address discharge in the address period. In this state, in the case of the red (R) and green (G) discharge cells in which discharge occurs well, when the Vs voltage is applied to the Y electrode and the 0 V voltage is applied to the X electrode in the sustain period, the discharge between the Y electrode and the A electrode is performed. It is more likely to occur before the discharge between the Y electrode and the X electrode. However, when the voltage Va1 is applied to the A electrodes of the red (R) and green (G) discharge cells as in the second embodiment of the present invention, the A and Y electrodes of the red (R) and green (G) discharge cells are applied. The voltage difference Vs-Va1 is reduced so that no discharge occurs between the A and Y electrodes of the red (R) and green (G) discharge cells. In the case of the blue (B) discharge cell, since the discharge does not occur well, the discharge does not occur easily between the Y electrode and the A electrode even when the Va1 voltage is not applied to the A electrode.

On the other hand, when all of the red (R), green (G), and blue (B) discharge cells are well discharged, the A electrode (A) of the red (R), green (G), and blue (B) discharge cells in the sustain period. _The voltage Va1 is applied to _R , A _G and A _B ). In this case, the switches connected between the A electrodes A _R , A _G and A _{B of the} red (R), green (G) and blue (B) discharge cells and the power supply for the voltage Va1 are simultaneously switched. This increases the EMI (Electro Magnetic Interference). Therefore, as shown in FIG. 5, in the third embodiment of the present invention, the voltage Va1 is applied to the A electrodes A _R , A _G , and A _B of the red (R), green (G), and blue (B) discharge cells. Do it differently.

5 illustrates a driving waveform of a plasma display device according to a third exemplary embodiment of the present invention. In FIG. 5, it is assumed that discharge occurs in order of red (R) phosphor, green (G), and blue (B) phosphor.

As shown in FIG. 5, the voltage Va1 is applied to the A electrode A _R of the red (R) discharge cell in which discharge occurs first. Thereafter, the voltage Va1 is applied to the A electrode A _G of the green (G) discharge cell, and finally, the voltage Va1 is applied to the A electrode A _B of the blue (B) discharge cell. As such, according to the discharge rates of the red (R) phosphor, the green (G) and the blue (B) phosphors, the A electrodes A _R , A _G , of the red (R) phosphor, green (G), and blue (B) discharge cells. When the timing at which the voltage Va1 is applied to A _B ) is different, a power supply for supplying the voltages A1 (A _R , A _G , A _B ) and Va1 of the red (R), green (G) and blue (B) discharge cells Since each connected switch is not switched at the same time, it is possible to reduce EMI (Electro Magnetic Interference).

Meanwhile, instead of applying Va1 voltage to the A electrode, the A electrode may be floated. As such, when the A electrode is floated, when the Vs voltage is applied to the Y electrode or the X electrode in the sustain period, the voltage of the A electrode is also positive. Thus, the same effects as in the first and second embodiments are obtained.

In the embodiment of the present invention, the case where the sustain discharge pulse having the Vs voltage and the 0 V voltage are alternately applied to the Y electrode and the X electrode has been described. However, another type of sustain discharge pulse may be used. For example, while the X electrode is applied with a reference voltage (for example, a 0V voltage), a sustain discharge pulse may be applied to the Y electrode alternately having a Vs voltage and a -Vs voltage. Even in this manner, the voltage difference between the X electrode and the Y electrode is the same as in the case of the sustain discharge pulse having the Vs voltage and the 0V voltage alternately.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

As described above, according to the present invention, according to the discharge characteristics of the red (R), green (G) and blue (B) phosphors, the address electrodes of the red (R), green (G) and blue (B) discharge cells ( A sustain discharge in the sustain period by varying the voltage applied to A _R , A _G , A _B ) or by applying different voltages to the address electrodes of the red (R), green (G) and blue (B) discharge cells. This can happen stably.

Claims (9)

A plurality of first electrodes and a plurality of second electrodes, a plurality of third electrodes formed in a direction crossing the first electrode and the second electrode, and each of the first electrode and each of the second electrode and the third electrode A plurality of discharge cells each defined by: wherein the plurality of third electrodes includes at least a first group defining a discharge cell of a first color, and at least a second group defining a discharge cell of a second color In the driving method of the plasma display device consisting of a group of, Alternately applying a sustain discharge pulse to at least one of the first and second electrodes of the plurality of discharge cells in a sustain period, and Applying a first voltage to a third electrode of a first group and applying a second voltage lower than the first voltage to a third electrode of the second group during a first period of the sustain period. Method of driving the device. The method of claim 1, The plurality of groups further includes a third group defining discharge cells of a third color, And applying the first voltage to the third electrode of the third group during the first period. The method of claim 1, The plurality of groups further includes a third group defining discharge cells of a third color, And applying the second voltage to the third electrode of the third group during the first period. A plurality of first electrodes and a plurality of second electrodes, a plurality of third electrodes formed in a direction crossing the first electrode and the second electrode, and each of the first electrode and each of the second electrode and the third electrode A plurality of discharge cells each defined by: wherein the plurality of third electrodes includes at least a first group defining a discharge cell of a first color, and at least a second group defining a discharge cell of a second color In the driving method of the plasma display device consisting of a group of, Alternately applying a sustain discharge pulse to at least one of the first and second electrodes of the plurality of discharge cells in a sustain period, and During the first period of the sustain period, the second group after the second period when the first voltage is applied to the third electrode of the first group and the first voltage is applied to the third electrode of the first group. And applying the first voltage to a third electrode of the plasma display device. The method of claim 4, wherein The plurality of groups further includes a third group defining discharge cells of a third color, And applying the first voltage to the third electrode of the third group when the first voltage is applied to the third electrode of the first group in the first period. Way. The method of claim 4, wherein The plurality of groups further includes a third group defining discharge cells of a third color, And applying the first voltage to the third electrode of the third group after the second period when the first voltage is applied to the third electrode of the first group during the first period. A method of driving a plasma display device. The method according to any one of claims 1 to 6, The discharge cell of the first color, the discharge cell of the second color, and the discharge cell of the third color respectively drive the plasma display device corresponding to any one of red (R), green (G), and blue (B). Way. The method of claim 7, wherein And the first period is a period corresponding to the beginning of the sustain period. The method of claim 8, And the first voltage is the same voltage as that applied to the third electrode of the discharge cell to be turned on in the address period.

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