KR100649259B1 - Plasma display and driving method thereof - Google Patents

Abstract

A plasma display device and a driving method thereof are provided to reduce power consumption by selectively applying voltage to an address electrode during a predetermined period right before the first sustain discharge pulse is applied in a sustain period, according to the temperature of a plasma display panel. A driving method for driving one frame according to plural subfields in a plasma display device having plural first electrodes, plural second electrodes displaying an image together with the first electrodes, and plural third electrodes(A) crossing the first and second electrodes includes the steps of: detecting the temperature of the plasma display device; applying sustain discharge pulse having a second voltage and a third voltage lower than the second voltage to the first and second electrodes at opposite phases, during a sustain period while applying a first voltage(Va1) to the third electrodes; applying a fourth voltage to the third electrodes during a predetermined section of the sustain period right before the first sustain discharge pulse is applied; and differently setting the fourth voltage according to the detected temperature of the plasma display device.

Description

Plasma display device and driving method thereof {PLASMA DISPLAY AND DRIVING METHOD THEREOF}

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

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

3 is a diagram illustrating an operation of the controller illustrated in FIG. 1.

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

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

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 of discharge cells are arranged in a matrix form according to their size.

In the plasma display device, one frame (1TV field) is divided into a plurality of subfields having respective weights and driven, 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, discharge cells to emit light and discharge cells not to emit light are selected by the address discharge, and the discharge cells to emit light selected in the sustain period are sustained and discharged for a period corresponding to the weight of the subfield to display an image. do.

In this 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 to the scan electrode and the sustain electrode in opposite phases. In this case, first, a Vs voltage is applied to the scan electrode and a 0 V voltage is applied to the sustain electrode, so that sustain discharge occurs between the scan electrode and the sustain electrode, and the sustain discharge causes negative (-) wall charges and ( +) Wall charges are formed. At this time, since the 0V voltage is also applied to the address electrode, the positive wall charges are dispersed not only in the sustain electrode but also in the address electrode. Therefore, the wall electrodes are not formed sufficiently in the sustain electrode. In this state, when the Vs voltage is subsequently applied to the sustain electrode and the 0 V voltage is applied to the scan electrode, the sustain discharge does not easily occur. In particular, since the discharge characteristics of the plasma display panel vary depending on the temperature, sustain discharge is less likely to occur at high or low temperatures where low discharge occurs well.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a plasma display device and a driving method thereof capable of securing discharge stability and reducing power consumption.

According to an aspect of the present invention, a plurality of second electrodes performing a display operation together with a plurality of first electrodes and the plurality of first electrodes, and a plurality of cross-sectional directions formed to cross the first electrode and the second electrode In the plasma display device including a third electrode of the present invention, a method of driving one frame into a plurality of subfields is provided. The driving method may include sensing a temperature of the plasma display device, and applying a first voltage to the plurality of third electrodes in a sustain period, wherein the second voltage is applied to the plurality of first electrodes and the plurality of second electrodes. Applying a sustain discharge pulse having a voltage and a third voltage lower than the second voltage in an opposite phase, and applying a fourth to the plurality of third electrodes for a predetermined period immediately before the first sustain discharge pulse is applied in the sustain period. Applying a voltage, and setting the fourth voltage differently according to the sensed temperature of the plasma display device.

According to another aspect of the present invention, a plasma display device including a plasma display panel, a driver, a temperature sensor, and a controller is provided. In this case, the plasma display panel includes a plurality of second electrodes that perform a display operation together with a plurality of first electrodes and the plurality of first electrodes, and a plurality of second electrodes formed in a direction crossing the first electrode and the second electrode. Three electrodes, and a plurality of discharge cells are formed by the first electrode, the second electrode and the third electrode. The driving unit has a sustain discharge pulse having a high level voltage and a low level voltage in the opposite phase to the plurality of first electrodes and the plurality of second electrodes in a state in which a first voltage is applied to the plurality of third electrodes in a sustain period. And a second voltage is applied to the plurality of third electrodes during the first period immediately before the sustain discharge pulse first applied in the sustain period. The temperature detector measures the temperature of the plasma display panel. The controller may be configured to set the second voltage when the temperature of the detected plasma display panel is higher than the first reference temperature or lower than the second reference temperature that is set lower than the first reference temperature. It is set higher than the second voltage in the case of a temperature between the first reference temperature and the second reference temperature.

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.

First, 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. And a temperature sensing unit 600.

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. 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, and each subfield is composed of a reset period, an address period, and a sustain period.

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.

The temperature detector 600 detects the temperature of the plasma display panel 100 and transmits the temperature to the controller 200.

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

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 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 Ve voltage is applied to the X electrode. 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 to initialize the discharge cells. 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 discharge cells to emit light, scan pulses having a VscL voltage are sequentially applied to a plurality of Y electrodes while a Ve voltage is applied to the X electrodes. At this time, the Va voltage is applied to the A electrode passing through the discharge cell to emit light among 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. Here, the VscL voltage may be set at a level equal to or lower than the Vnf voltage. The VscH voltage higher than the VscL voltage is applied to the Y electrode to which the VscL voltage is not applied, and the reference voltage is applied to the A electrode of the discharge cell that is not selected.

Meanwhile, 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 of Va voltage is applied among the A electrodes A1 to Am.

In the sustain period, a sustain discharge pulse having a high level voltage (Vs voltage in FIG. 2) and a low level voltage (0V in FIG. 2) is applied to the Y electrode and the X electrode in the opposite phase, between the Y electrode and the X electrode of the discharge cell to be turned on. Sustain discharge occurs. At this time, the voltage Va1 is applied to the A electrode for a predetermined period before the sustain discharge pulse is first applied in time in the sustain period. In FIG. 2, the first sustain discharge pulse is applied to the Y electrode in the sustain period, but may be applied to the X electrode. As such, when the voltage Va1 is applied to the A electrode before the first sustain discharge pulse is applied to the Y electrode in the sustain period, (+) wall charges are moved to the Y electrode, and when the Vs voltage is subsequently applied to the Y electrode, The sustain discharge can stably occur between the Y electrode and the X electrode. Using the Va voltage as the Va1 voltage reduces the number of additional power sources. 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.

However, in order to apply the Va1 voltage to the A electrode, the power consumption of the A electrode side is increased due to the switching of the switching element connected between the power supply for supplying the Va1 voltage and the A electrode.

On the other hand, the plasma display device has a characteristic that the discharge characteristics of the plasma display panel 100 vary with temperature. At high temperatures, the movement of electrons in the discharge space becomes active, and as the anions and cations in the cell merge, the cations and anions in the cell may be reduced. This may result in low discharge at high temperatures. In addition, at low temperatures, the movement of electrons in the discharge space is slow, and wall charges are not generated well, so low discharge may occur even at low temperatures. Therefore, the following example shows that the discharge stability can be secured by selectively applying the Va1 voltage to the A electrode in the sustain period according to the temperature of the plasma display device, while at the same time reducing the power consumption. It demonstrates with reference to 3 and FIG.

3 is a diagram illustrating an operation of the controller illustrated in FIG. 1.

As shown in FIG. 3, the controller 200 sets the voltage Va1 to be selectively applied to the A electrode in the sustain period according to the temperature of the plasma display panel 100. That is, the controller 200 receives the temperature of the plasma display panel 100 sensed by the temperature sensor 600 (S310) and the second reference temperature set to a temperature lower than the first reference temperature and the first reference temperature. Compare (S320). In this case, when it is determined that the temperature of the plasma display panel 100 is higher than the first reference temperature or lower than the second reference temperature, the control unit 200 applies a control signal for applying the Va1 voltage to the A electrode in the sustain period. When the temperature of the plasma display panel 100 is determined to be a temperature between the first reference temperature and the second reference temperature, the reference voltage is applied to the A electrode in the sustain period. The applied control signal is transmitted to the address electrode driver (S340, see FIG. 4). In this case, generally, the temperature between the first reference temperature and the second reference temperature is generally a temperature range of room temperature, and the room temperature may be a temperature between 15 degrees and 25 degrees.

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

As shown in FIG. 4, the driving waveform according to the second embodiment of the present invention is similar to the first embodiment. The difference is that the reference voltage is applied to the A electrode in the predetermined period immediately before the first sustain discharge pulse is applied in the sustain period. That is, when the temperature of the plasma display panel 100 corresponds to a temperature between the first reference temperature and the second reference temperature, the reference voltage is applied to the A electrode as shown in FIG. 4 due to the characteristics of the plasma display panel 100. The discharge stability can be sufficiently secured, and thus power consumption can be reduced.

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, power consumption is reduced by selectively applying Va1 voltage to the A electrode for a predetermined period immediately before the first sustain discharge pulse is applied in the sustain period according to the temperature of the plasma display panel. At the same time, in the case where sustain discharge does not occur probably well, discharge stability is ensured.

Claims (6)

A plasma including a plurality of first electrodes and a plurality of second electrodes performing a display operation together with the plurality of first electrodes, and a plurality of third electrodes formed in a direction crossing the first electrode and the second electrode In the method of driving by dividing a frame into a plurality of subfields in the display device, Sensing a temperature of the plasma display device; A sustain discharge pulse having a second voltage and a third voltage lower than the second voltage to the plurality of first electrodes and the plurality of second electrodes while a first voltage is applied to the plurality of third electrodes in the sustain period Applying to the opposite phase, Applying a fourth voltage to the plurality of third electrodes for a predetermined period immediately before the first sustain discharge pulse is applied in the sustain period, and And setting the fourth voltage differently according to the sensed temperature of the plasma display device. The method of claim 1, The fourth voltage when the temperature of the plasma display device is between a first reference temperature and a second reference temperature set lower than the first reference temperature, or the temperature of the plasma display device is higher than the first reference temperature; And a method of driving the plasma display device lower than the fourth voltage when the temperature is lower than the second reference temperature. The method of claim 2, And the fourth voltage when the temperature of the plasma display device is between the first reference temperature and a second reference temperature set lower than the first reference temperature is equal to the first voltage. The method of claim 2, The fourth voltage when the temperature of the plasma display device is higher than the first reference temperature or lower than the second reference temperature is equal to the voltage applied to the third electrode of the discharge cell to be turned on in the address period. Way. A plurality of second electrodes performing a display operation together with a plurality of first electrodes and the plurality of first electrodes, and a plurality of third electrodes formed in a direction crossing the first electrode and the second electrode, A plasma display panel in which a plurality of discharge cells are formed by the first electrode, the second electrode, and the third electrode; In a sustain period, a sustain discharge pulse having a high level voltage and a low level voltage is applied to the plurality of first electrodes and the plurality of second electrodes in a state in which a first voltage is applied to the plurality of third electrodes in a reverse phase. A driving unit applying a second voltage to the plurality of third electrodes during a first period immediately before a sustain discharge pulse first applied in the sustain period; A temperature sensing unit measuring a temperature of the plasma display panel; The second voltage when the temperature of the detected plasma display panel is higher than the first reference temperature or lower than the second reference temperature that is set lower than the first reference temperature is the temperature of the detected plasma display panel is the first reference temperature. And a control unit which is set higher than the second voltage when the temperature is between the second reference temperature. The method of claim 5, The control unit, The second voltage is set equal to the first voltage when the sensed temperature of the plasma display panel is a temperature between the first reference temperature and the second reference temperature. And setting the second voltage to a voltage higher than the first voltage when the sensed temperature of the plasma display panel is lower than a second reference temperature set higher than the first reference temperature or lower than the first reference temperature.

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