KR20080010711A - Plasma display apparatus - Google Patents

Abstract

A plasma display device is provided to reduce a manufacturing cost thereof by altering a circuit supplying a scan pulse and utilizing a voltage source of Vs/2. A plasma display panel has electrodes, and a sustain driver(270) has an energy storage(260) supplied with a voltage from the plasma display panel to supply energy. A scan driver(250) is supplied with the voltage from the energy storage to supply a scan bias voltage. A scan voltage source(230) supplies a scan writing voltage to an electrode in an address period, and a control switch unit(280) controls the supply of the scan bias voltage. The control switch unit has a first switch connected between the energy storage and the scan driver and a second switch connected between the scan voltage source and the energy storage.

Description

Plasma Display Apparatus {Plasma Display Apparatus}

1 illustrates a plasma display device according to an embodiment of the present invention.

2 illustrates a plasma display panel according to an exemplary embodiment of the present invention.

3 illustrates a method of driving a plasma display device according to an exemplary embodiment of the present invention.

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

5 shows an energy recovery circuit of a conventional plasma display panel.

FIG. 6A illustrates an example of a timing diagram in which the plasma display panel is driven by the first driver shown in FIG. 4.

FIG. 6B is an enlarged view of A of the sustain period in FIG. 6A.

7A to 7E illustrate a method in which the first driving unit illustrated in FIG. 4 operates according to the timing diagram of FIG. 6A.

8 illustrates a first driver included in the plasma display device according to the second embodiment of the present invention.

       (Explanation of symbols for the main parts of the drawing)

100: plasma display panel 200: first driver

210: setup pulse supply unit 220: set down pulse supply unit

230: scan write voltage source 240: scan pulse supply unit

250: scan driver 260: energy storage

270: sustain drive unit 280: control switch unit

290: path control supply

The present invention relates to a plasma display device.

In general, a plasma display apparatus is formed by attaching a plasma display panel for displaying an image and a driving unit for driving the plasma display panel to a rear surface of the plasma display panel.

The plasma display panel has a plurality of discharge cells formed by barrier ribs formed between the front substrate and the rear substrate of the plasma display panel on which an image is displayed. Each cell includes neon and helium. Or inert gas containing a small amount of xenon and a main discharge gas such as a mixture of neon and helium (Ne + He). A plurality of such discharge cells are gathered to form one pixel. For example, a red (R) discharge cell, a green (G) discharge cell, and a blue (B) discharge cell are assembled to form one pixel.

When the plasma display panel is 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. Such a plasma display panel has been spotlighted as a display device because of its thin and light configuration.

An object of the present invention is to change the circuit for supplying the scan pulse by applying a new circuit concept of the plasma display device, and to provide a plasma display device using an energy storage unit as a voltage source of Vs / 2.

Technical problems to be achieved by the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.

A plasma display device according to an embodiment of the present invention for achieving the above object is a sustain display and energy storage having a plasma display panel including an electrode, an energy storage unit for supplying energy by charging and discharging a voltage supplied from the plasma display panel And a scan driver configured to receive a voltage from the unit and supply a scan bias voltage.

In addition, the sustain driver includes a rising resonance switch for supplying the voltage stored in the energy storage unit to the panel by resonance, a falling resonance switch for supplying the voltage stored in the panel to the energy storage unit by resonance, and an inductor generating resonance with the panel. Further comprising, the energy storage unit is electrically connected between the rising resonance switch and the falling resonance switch, the falling resonance switch is electrically connected between the energy storage unit and the inductor is formed, the rising resonance switch and the falling resonance switch at the same time It may be turned on to perform a resonance operation.

The apparatus may further include a control switch configured to control the supply of the scan write voltage source and the scan bias voltage to supply the scan write voltage to the electrode in the address period.

In addition, the first switch unit for controlling the scan bias voltage supplied to the electrode is electrically connected between the energy storage unit and the scan driver, and the second switch unit for controlling the scan write voltage supplied to the energy storage unit is a scan write voltage source and energy storage. It may be characterized in that it is electrically connected between the parts.

In addition, at least one of the first switch unit or the second switch unit may be characterized in that it comprises a diode.

In addition, the first switch unit may include a diode, wherein an anode end of the diode is electrically connected to the energy storage unit, and a cathode end of the diode is electrically connected to the scan driver.

In addition, the second switch unit may include a diode, wherein an anode end of the diode is electrically connected to the scan write voltage source, and a cathode end of the diode is electrically connected to the energy storage unit.

In addition, the scan write voltage source may be characterized by being a negative polarity voltage.

In addition, the energy storage unit may include a capacitor.

In addition, the scan bias voltage may be characterized in that less than -200V.

In addition, the voltage charged in the energy storage unit may be characterized in that half the magnitude of the sustain voltage.

Specific details of other embodiments are included in the detailed description and drawings. Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. Like reference numerals refer to like elements throughout.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 illustrates a plasma display device according to an embodiment of the present invention. 1, a plasma display device according to an embodiment of the present invention includes a plasma display panel 100 including an electrode, a first driver 200, a second driver 300, and a third driver 400. do.

The plasma display panel 100 is bonded to the front panel (not shown) and the rear panel (not shown) at regular intervals, and scan electrodes Y1 to Yn, sustain electrodes Z, and address electrodes X1 to Xn. It includes.

The first driver 200, the second driver 300, and the third driver 400 apply predetermined driving pulses to a plurality of electrodes formed in the plasma display panel 100 in one or more subfields included in one frame. Supply.

The first driver 200 may supply a reset pulse to the scan electrodes Y1 to Yn to uniformly form a wall charge in the discharge cell. In addition, the sustain pulse is supplied to the scan electrodes Y1 to Yn so that the image is displayed while maintaining the scan pulse and the discharge. In addition, the first driver 200 supplies a scan bias voltage by receiving a voltage from a sustain driver and an energy storage unit including an energy storage unit for supplying energy by charging and discharging the voltage supplied from the plasma display panel 100. It includes a scan driver. A detailed description of the first driver 200 will be described later with reference to FIG. 4.

The second driver 300 supplies the sustain bias pulses to the sustain electrodes Z during the sustain period and the address period of the falling ramp pulse under the control of the timing controller (not shown), and the image during the sustain period. The sustain pulse is supplied to the sustain electrode Z so as to be displayed.

In the third driver 400, inverse gamma correction and error diffusion are performed by an inverse gamma correction circuit, an error diffusion circuit, and the like, and then data mapped to each subfield is supplied by a subfield mapping circuit. The third driver 400 samples and latches data in response to a data timing control pulse from a timing controller (not shown), and then supplies the latched data to the address electrodes X1 to Xn.

The structure of the plasma display panel 100 will be described in more detail with reference to FIG. 2.

2 illustrates a plasma display panel according to an exemplary embodiment of the present invention. 2, a plasma display panel according to an embodiment of the present invention includes a front panel 100 including a front substrate 101 on which a scan electrode 102 and a sustain electrode 103 are formed, and a scan electrode 102. ) And the rear panel 110 including the rear substrate 111 on which the address electrode 113 intersects the sustain electrode 103 is formed to be bonded to each other at a predetermined interval.

The scan electrode 102 and the sustain electrode 103 formed on the front substrate 101 are formed in parallel with each other to generate a discharge in the discharge cell and maintain the discharge of the discharge cell.

The scan electrode 102 and the sustain electrode 103 formed on the front substrate 101 need to consider light transmittance and electrical conductivity in order to emit light generated in the discharge cell to the outside and to secure driving efficiency. Accordingly, each of the scan electrode 102 and the sustain electrode 103 is an opaque silver (Ag) bus electrode 102b or 103b and a transparent indium tin oxide (ITO) transparent electrode 102a or 103a. ) May be included.

The driving electrode according to the embodiment of the present invention is supplied to the scan electrode 102 and the sustain electrode 103. A detailed description of the driving pulse supplied to the scan electrode 102 and the sustain electrode 103 will be described later.

An upper dielectric layer 104 may be formed on the front substrate 101 on which the scan electrode 102 and the sustain electrode 103 are formed to cover the scan electrode 102 and the sustain electrode 103.

Upper dielectric layer 104 limits the discharge current of scan electrode 102 and sustain electrode 103 and insulates between scan electrode 102 and sustain electrode 103.

A protective layer 105 may be formed on the upper dielectric layer 104 to facilitate discharge conditions. The protective layer 105 may be made of a material having a high secondary electron emission coefficient, for example, magnesium oxide (MgO), and may be formed on the upper dielectric layer 104 by a deposition method or the like.

On the other hand, the address electrode 113 formed on the rear substrate 111 is an electrode for applying a data pulse to the discharge cell.

The lower dielectric layer 115 is formed on the rear substrate 111 on which the address electrode 113 is formed to cover the address electrode 113. In the structure of the plasma display panel of FIG. 2, only the case where the upper dielectric layer 104 and the lower dielectric layer 115 are each one layer is illustrated, but the upper dielectric layer 104 and the lower dielectric layer 115 are not shown. At least one or more may consist of a plurality of layers.

In the upper portion of the lower dielectric layer 115, a discharge space, that is, a partition wall 112 for partitioning the discharge cells is formed. The structure of the discharge cell formed by the partition wall 112 may be formed in various shapes such as a well type, a delta type, and a honeycomb type.

In the discharge cells partitioned by the partition wall 112, a phosphor layer 114 for emitting visible light for image display upon address discharge is formed. For example, red (R), green (G), and blue (B) phosphor layers may be formed. In addition, a tunnel may be formed on the side surface of the partition wall 112 in order to improve exhaust characteristics during the plasma display manufacturing process.

In the plasma display panel according to the exemplary embodiment described above, when a driving pulse is applied to the scan electrode 102, the sustain electrode 103, and the address electrode 113, the plasma display panel is divided into the discharge cells partitioned by the partition wall 112. Discharge occurs in the image to realize the image.

In FIG. 2, only the plasma display panel according to the exemplary embodiment of the present invention is illustrated and described, and it is apparent that the exemplary embodiment of the present invention is not limited to the plasma display panel having the structure of FIG. 2. For example, a black layer (not shown) may be further formed on the top of the partition wall 112 to prevent reflection of the external light due to the partition wall 112.

In addition, the spacing of the partition walls 112 of the blue (B) discharge cells may be wider.

In addition, the side surface of the barrier rib 112 may have an uneven shape, and the phosphor layer diagram 114 may be formed according to the uneven shape of the coated layer to further increase the luminance of an image implemented in the plasma display panel.

In addition, a tunnel may be formed on a side surface of the partition wall 112 to improve exhaust characteristics during the plasma display manufacturing process.

In FIG. 2, the case where the electrode of the panel includes the scan electrode 102, the sustain electrode 103, and the address electrode 113 is taken as an example. Accordingly, in the following description, it is assumed that the electrode has a three-electrode structure.

Next, an example of a driving method for driving the plurality of electrodes of the plasma display panel 100 by each of the first driver 200, the second driver 300, and the third driver 400 described above with reference to FIG. 1 is attached. Looking in detail with reference to Figure 3 as follows.

3 illustrates a method of driving a plasma display device according to an exemplary embodiment of the present invention. Referring to FIG. 3, each of the first driving unit 200, the second driving unit 300, and the third driving unit 400 described above with reference to FIG. 1 includes a scan electrode in at least one of a reset period, an address period, and a sustain period. Y), a drive pulse is supplied to the sustain electrode Z and the address electrode X. FIG.

The first driver 200 may supply the rising ramp pulse Ramp-up to the scan electrode Y in the setup period of the reset period.

Due to the rising ramp pulse, a weak dark discharge occurs in the discharge cells of the entire screen. Due to the setup discharge, positive wall charges are accumulated on the address electrode X and the sustain electrode Z, and negative wall charges are accumulated on the scan electrode Y.

In addition, after the first driving unit 200 supplies the rising ramp pulse to the scan electrode Y in the set-down period, the first driving unit 200 starts to fall from the positive voltage lower than the maximum voltage of the rising ramp pulse to be equal to or less than the ground level voltage GND. Supply ramp ramp down to a specific voltage level.

As a result, a weak erase discharge is generated in the discharge cell, thereby sufficiently erasing wall charges excessively formed in the discharge cell. By this set-down discharge, wall charges such that the address discharge can stably occur remain uniformly in the discharge cell.

The second driver 300 supplies the sustain bias voltage Vzb to the sustain electrode Z during the set down period and the address period. The sustain bias voltage Vzb may reduce the voltage difference between the scan electrode Y and the sustain electrode Z to prevent erroneous discharge.

In addition, the first driver 200 may supply the scan electrode Y with a negative scan pulse Scan that falls from the scan bias voltage Vs / 2-Vy in the address period. In addition, the third driver 400 supplies a positive data pulse to the address electrode X in response to the above-described scan pulse Scan.

As the voltage difference between the scan pulse and the data pulse and the wall voltage generated in the reset period are added, an address discharge is generated in the discharge cell to which the data pulse is applied. In the discharge cells selected by the address discharge, wall charges are formed such that a discharge can occur when the sustain voltage Vs is applied.

In the sustain period after the address period, the first driver 200 and the second driver 300 supply the sustain pulse SUS to the scan electrode Y and the sustain electrode Z. FIG. Accordingly, the discharge cell selected by the address discharge is sustained between the scan electrode Y and the sustain electrode Z every time the sustain pulse SUS is applied while the wall voltage and the sustain pulse SUS are added to the discharge cell. Discharge occurs.

Such a driving method has been described according to an example. The erase period may be further added after the sustain period, and the pre-reset period may be added before the reset period.

In addition, in FIG. 3, the first driver and the second driver are operated independently, but the first driver and the second driver may operate in an integrated manner.

Here, the first driving unit described above will be described in more detail with reference to FIG. 4.

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

The first driver 200 may include a setup pulse supply 210, a set down pulse supply 220, a scan write voltage source 230, a scan pulse supply 240, a scan driver 250, an energy storage unit 260, and a sustain driver. 270, a control switch unit 280, and a path control supply unit 290.

The set-up pulse supply unit 210 receives a voltage from the sustain voltage source Vs and the set-up voltage source Vset-up to the scan electrode Y in the set-up period during the reset period, and supplies a set-up pulse that gradually rises.

The setdown pulse supply unit 220 receives a voltage from the scan write voltage source 230 to the scan electrode Y in a setdown period, and supplies a setdown pulse that gradually decreases.

The scan write voltage source 230 supplies the scan write voltage (-Vy) to the scan electrode Y through the set down pulse supply unit 220 or the scan pulse supply unit 240 in the set down period or the address period. This scan write voltage (-Vy) may be a negative voltage.

The scan pulse supply unit 240 receives a voltage from the scan write voltage source 230 to the scan electrode Y in the address period and supplies a scan pulse.

The scan driver 250 includes a scan drive integrated circuit and supplies a scan bias voltage to the scan electrode Y or a scan write voltage -Vy to the scan electrode Y.

The energy storage unit 260 charges a voltage for forming a sustain pulse, and receives a scan write voltage (-Vy) to form a scan bias voltage supplied to an electrode in an address period. The energy storage unit 260 may include a capacitor Cer to charge the voltage. The voltage charged in the energy storage unit 260 is formed by resonance of the inductor L and the plasma display panel Cp. This voltage may be half the magnitude of the sustain voltage. In the plasma display device according to an embodiment of the present invention, the energy storage unit 260 serves as a Vs / 2 voltage source.

In addition, the sustain driver 270 resonates the voltage stored in the rising resonance switch Yer_up and the plasma display panel Cp to supply the voltage charged in the energy storage unit 260 to the plasma display panel Cp by resonance. And a falling resonance switch Yr_dn for supplying the energy storage unit 260 to the energy storage unit 260 and an inductor L generating resonance with the plasma display panel Cp.

In addition, the energy storage unit 260 is electrically connected between the rising resonance switch Yer_up and the falling resonance switch Yer_dn, and the falling resonance switch Yer_dn is electrically connected between the energy storage unit 260 and the inductor L. It is formed by connecting. When the voltage rises and resonances, the body diodes of the rising resonance switch Yer_up and the falling resonance switch Yer_dn turn on, and the falling resonance switch Yer_dn and the rising resonance when the voltage falls resonance. The body diode of the switch Ye_up is turned on.

Compared with the conventional energy recovery circuit, the energy recovery circuit which is the improved sustain driver 270 according to the exemplary embodiment of the present invention described above is the energy recovery circuit which is the improved sustain driver 270 according to the exemplary embodiment of the present invention. You can easily find out about it.

5 shows an energy recovery circuit of a conventional plasma display panel. Referring to FIG. 5, the energy recovery devices 30 and 32 of the plasma display panel proposed by 'Weber (USP-5081400)' are symmetrically formed with each other with the panel capacitor Cp interposed therebetween. Here, the panel capacitor Cp equivalently represents the capacitance formed between the scan electrode Y and the sustain electrode Z. FIG. In the energy recovery device, the first energy recovery device 30 supplies a sustain voltage to the scan electrode Y, and the second energy recovery device 32 operates while alternating with the first energy recovery device 30. The sustain voltage is supplied to the electrode Z.

The source capacitor Cs recovers and charges the voltage charged in the panel capacitor Cp during the sustain discharge, and supplies the charged voltage to the panel capacitor Cp again. The source capacitor Cs is charged with a voltage of Vs / 2 corresponding to half of the sustain voltage source Vs. The inductor L forms a resonance circuit together with the panel capacitor Cp. To this end, the first to fourth switches S1 to S4 control the flow of current. Meanwhile, the fifth and sixth diodes D5 and D6 provided between the first and second switches S1 and S2 and the inductor L respectively prevent current from flowing in the reverse direction.

As described above, although a diode is electrically connected between the switch and the inductor in order to prevent the current from flowing in the reverse direction, the energy recovery circuit, which is an improved sustain driver 270 according to an embodiment of the present invention, uses a conventional diode. Even if removed, the energy recovery circuit can be operated. Therefore, the number of parts of the product can be reduced by removing the diode from the energy recovery circuit which is the sustain driver.

Until now, the comparison of the energy recovery circuit, which is the sustain driving unit according to the embodiment of the present invention, and the conventional energy recovery circuit, are described.

The control switch unit 280 may include a first switch unit 280a electrically connected between the energy storage unit 260 and the scan driver 250, and an electrical connection between the scan write voltage source 230 and the energy storage unit 260. It includes a second switch unit 280b connected to.

In addition, the first switch unit 280a may control the scan bias voltage supplied to the scan electrode, and the second switch unit 280b may control the scan write voltage supplied to the energy storage unit 260.

The path control supply unit 290 is not only a path for the sustain driver 270 to supply pulses to the plasma display panel Cp but also supplies the pulses from which the plasma display panel Cp is recovered to the sustain driver 270. It will be a path for blocking the pulse.

Looking at the specific connection relationship of the first drive unit 300 having such a function as follows.

One end of the high switch High is electrically connected to the scan electrode Y, and the other end is electrically connected to one end of the first switch unit SW1.

One end of the low switch Low is electrically connected to the scan electrode Y and one end of the high switch High, and the other end is electrically connected to one end of the scan pulse switch Ysw SW.

One end of the energy storage unit Cer is electrically connected to the other end of the first switch unit SW1, and the other end is electrically connected to one end of the second switch unit SW2.

One end of the scan write voltage source Vy is electrically connected to the other end of the second switch unit SW2 and the other end is electrically connected to the base voltage source GND.

One end of the rising resonance switch (Yer-up) is connected to the other end of the energy storage unit (Cer), the other end is electrically connected to the ground voltage source (GND).

One end of the set-down switch Yset-dn is electrically connected to the other end of the low switch Low and one end of the scan pulse switch Ysw, and the other end is one end of the scan write voltage source Vy and the scan pulse switch Ysw. It is electrically common with the other end of.

One end of the pass top switch (Ypass-top) is electrically connected to one end of the set-down switch (Yset-dn), and the other end is electrically connected to one end of the pass bottom switch (Ypass-bt) and one end of the setup switch (Yset-up). Common connection.

One end of the setup switch (Yset-up) is electrically connected to one end of the pass bottom switch (Ypass-bt) and the other end of the pass top switch (Ypass-top), and the other end is one end of the setup constant voltage source (Vset-up). Is electrically connected to the

The other end of the setup constant voltage source Vset-up is electrically connected to the ground voltage source GND.

One end of the inductor L is electrically connected to the other end of the pass bottom switch Ypass-bt, one end of the sustain switch Ysus-up and one end of the base voltage switch Ysus-up, and the other end thereof is a falling resonance switch. It is electrically connected to one end of (Yer-dn).

One end of the sustain switch Ysus-up is electrically connected in common with one end of the base voltage switch Ysus-up, one end of the inductor L and the other end of the pass bottom switch Ypass-bt, and the other end is connected to the sustain voltage source ( It is electrically connected to one end of Vs).

The other end of the ground voltage switch Ysus-up is electrically connected to the ground voltage source GND.

One end of the falling resonance switch Yer-dn is electrically connected to the other end of the inductor L, and the other end is electrically connected to the other end of the first switch SW1 and one end of the energy storage unit Cer.

Next, the operation of the first driving unit configured as described above will be described with reference to FIGS. 6A to 7E.

FIG. 6A illustrates an example of a timing diagram in which the plasma display panel is driven by the first driver shown in FIG. 4, and FIG. 6B illustrates an enlarged view of A of the sustain period in FIG. 6A.

7A to 7E illustrate a method in which the first driving unit illustrated in FIG. 4 operates according to the timing diagram of FIG. 6A.

First, referring to FIG. 6A, the first driver 300 according to an embodiment of the present invention supplies a driving voltage to the scan electrode Y in the reset period, the address period, and the sustain period.

In step 1 of FIG. 6A, the rising resonance switch Y-up SW is turned on and the pass top switch Ypass-top is turned on.

In this case, as shown in FIG. 6A, the rising resonance switch Yer-up, the capacitor unit Ce, the falling resonance switch Yer-dn, the inductor L, the pass bottom switch Ypass-bt, and the pass A current path of ① is formed that leads to the top switch (Ypass-top), the low switch (Low), and the panel Cp. As a result, the voltage supplied to the scan electrode Y rises to the voltage Vs.

In addition, in step 2 of FIG. 6A, the sustain switch Ysus-up remains turned On, the pass top switch Ypass-top is turned On, and the low switch Low. Turn On.

In this case, as shown in FIG. 6A, a sustain voltage source Vs, a sustain switch Ysus-up SW, a pass bottom switch Ypass-bt SW, a pass-top SW, and a low switch Low SW) and a current path of? Leading to the panel Cp is formed. As a result, the voltage supplied to the scan electrode Y maintains the voltage Vs.

After the current path of ① and the current path of ② have been formed, step (3) of FIG. 6A maintains the setup switch (Yset-up) turned on and the pass top switch (Ypass-top) turns on. (Turn On).

In this case, as shown in FIG. 6A, the setup voltage source Vset-up, the setup switch Yset-up, the pass top switch Ypass-top, the low switch Low, and the panel Cp are connected to each other. A current pass is formed.

As a result, the voltage supplied to the scan electrode Y increases to the voltage Vs + Vset-up, which is the sum of the voltage Vs and the set-up voltage (Vset-up), so that a weak dark discharge occurs in the discharge cell of the entire screen. Due to the current path of (3), positive wall charges are accumulated on the address electrode (not shown) and the sustain electrode Z, and negative wall charges are accumulated on the scan electrode (Y).

In step ④ of FIG. 6A, the low switch Low is turned on and the set down switch Yset-dn is turned on.

In this case, as shown in FIG. 7B, a current path leading to the panel Cp, the low switch Low, the set down switch Yset-dn, and the scan write constant voltage source Vy is formed.

Accordingly, it is possible to supply a falling ramp pulse (Ramp-down) that starts to fall at a constant voltage lower than the highest voltage of the rising ramp pulse and falls to a specific voltage level below the ground (GND) level voltage.

At this time, the current path of ② shown in FIG. 7A maintains the voltage Vs until the point falling from the highest voltage of the rising ramp pulse. Therefore, the positive voltage lower than the maximum voltage of the rising ramp pulse drops until the Vs voltage, and after holding the voltage voltage for a while, it starts to fall again and falls to a specific voltage level below the ground (GND) level voltage. -down) can descend in two stages.

 The specific voltage level may be approximately the negative scan write voltage.

As a result, a weak erase discharge is generated in the discharge cell, thereby sufficiently erasing wall charges excessively formed in the discharge cell. By this set-down discharge, the wall charges such that the address discharge can be stably generated remain uniformly in the discharge cells.

In step ⑤ of FIG. 6A, the first switch unit SW1 is turned on, the high switch High is turned on, and the second switch unit SW2 is turned on. .

In this case, as shown in FIG. 7C, the scan write voltage source (-Vy), the second switch unit SW2, the energy storage unit Cer, the first switch unit SW1, the high switch High, and the panel ( A current path of? Leading to the scan electrode Y of Cp) is formed.

Referring to the current path of ⑤, the scan write voltage source (-Vy) supplies the scan write voltage (-Vy) to the energy storage unit (Cer) when the second switch unit is turned on. In addition, a voltage of Vs / 2 is charged at both ends of the energy storage unit Cer. At this time, the scan bias voltage (-Vy + Vs / 2) in the output waveform is increased by the VS / 2 voltage relative to the scan write voltage (-Vy). Here, the rising resonance switch (Yer-up) is turned off (Turn Off) state, the remaining switches are all maintained (Turn Off) state.

Therefore, the voltage passing through the energy storage unit Cer becomes the voltage obtained by adding the VS / 2 voltage to the scan write voltage (-Vy). The scan bias voltage (-Vy + Vs / 2) is supplied to the panel Cp through the first switch unit SW1 and the high switch High. Therefore, the voltage of the scan electrode rises to (-Vy + Vs / 2) at the lowest voltage of the set-down pulse as shown in the period? Of FIG. 6A.

When the scan bias voltage (-Vy + Vs / 2) is formed, a data pulse is applied while the voltage difference between the scan bias voltage (-Vy + Vs / 2) and the data voltage is added together with the generated wall voltage in the reset period. The address discharge is stably generated in the discharge cell. Thus, wall charges are formed in the discharge cells selected by the address discharge so that the discharge can occur when the sustain voltage Vs is applied.

6A of FIG. 6A, the low switch Low is turned on and the scan pulse switch Ysw is turned on.

In this case, as shown in FIG. 7D, a current path leading to the panel Cp, the low switch Low, the scan pulse switch Ysw, and the scan write voltage source Vy is formed.

Accordingly, a voltage falling from the scan bias voltage (-Vy + Vs / 2) to the scan write voltage (-Vy) can be supplied to the panel.

In step 7 of FIG. 6A, the first switch unit SW1 is turned on, the high switch High is turned on, and the second switch unit SW2 is turned on. .

In this case, as shown in FIG. 7E, the scan write voltage source Vy, the second switch unit SW2, the energy storage unit Cer, the first switch unit SW1, the high switch High, and the panel Cp are shown. A current path of ⑦ leading to) is formed.

The description of the current path of ⑦ is the same as that of the current path of ⑤, so it will be omitted.

In step (8) of FIG. 6B, the rising resonance switch (Yer-up) is turned on, and the body diode of the falling resonance switch (Yer-dn) is turned on, and the pass-top switch is Ypass-top SW. ) Is turned on.

In this case, as shown in FIG. 7F, a body diode of the rising resonance switch (Yer-up), the energy storage unit (Cer), the falling resonance switch (Yer-dn), the inductor (L), and the pass bottom switch (Ypass-) are shown. bt, a current path of (8) leading to a pass top switch (Ypass-top), a low switch (Low), and a panel Cp is formed.

Accordingly, the voltage supplied to the scan electrode Y is charged to the panel Cp along the current path through the rising resonance between the inductor L and the panel Cp. At this time, the charged voltage gradually rises to the sustain voltage.

In step 9 of FIG. 6B, the sustain switch Ysus-up is turned on and the pass top switch Ypass-top is turned on.

In this case, as shown in FIG. 7F, a sustain voltage source Vs, a sustain switch Ysus-up, a pass bottom switch Ypass-bt, a pass top switch Ypass-top, a low switch Low panel A current path of ⑨ leading to Cp is formed.

As a result, the sustain voltage Vs is supplied to the scan electrode Y of the panel Cp by the current path. Such a sustain voltage can generate sustain discharge in the discharge cell.

In step ⑩ of FIG. 6B, the low switch (Turn) is turned on, the pass bottom switch (Ypass-bt) is turned on, and the falling resonance switch (Yer-dn) is turned on. Turn On and the rising resonance switch Yer-up are turned On.

In this case, as shown in FIG. 7G, the panel Cp, the low switch Low, the pass top switch Ypass-top, the pass bottom switch Ypass-bt, the inductor L, and the falling resonance switch Yer. dn), a current path of kV to the energy store Cer is formed. Accordingly, the voltage supplied to the scan electrode Y is charged in the energy storage unit Cer along the current path through the falling resonance between the inductor L and the panel Cp. At this time, the voltage that is charged is charged with the voltage Vs / 2, which is about half the voltage of the sustain voltage. This voltage takes the place of the Vsc voltage source removed in accordance with one embodiment of the present invention.

In step (b) of FIG. 6B, the low switch is turned on, the pass bottom switch Ypass-bt is turned on, and the base voltage switch Ysus-dn is turned on. Turn On.

In this case, as shown in FIG. 7G, the panel Cp, the low switch Low, the pass top switch Ypass-top, the pass bottom switch Ypass-bt, and the base voltage switch Ysus-dn are connected. A current path of is formed.

Accordingly, the ground voltage GND is supplied to the scan electrode Y of the panel Cp by the current path.

In the sustain period, the energy supply or recovery operation is performed in this manner, and the Vs / 2 voltage is formed in the energy storage unit Cer, which is approximately half the voltage of the sustain voltage compared to the ground voltage GND.

8 illustrates a first driver included in the plasma display device according to the second embodiment of the present invention.

At least one of the first switch units D1 and 280c or the second switch units D2 and 280d included in the control switch of FIG. 4 may include a diode. FIG. 8 shows that the first switch units D1 and 280c and the second switch units D2 and 280d are formed of diodes.

In FIG. 8, the same parts will be omitted and different parts will be described in comparison with FIG. 4.

First, referring to a connection relationship of a circuit, an anode end of a diode included in the first switch unit 280c is electrically connected to the energy storage unit 260, and a cathode end of the diode is electrically connected to the scan driver 250. Can be.

In addition, the anode terminal of the diode included in the second switch unit 280d may be electrically connected to the scan write voltage Vy source, and the cathode terminal of the diode may be electrically connected to the energy storage unit 260.

Since the first switch 280c and the second switch 280d include a diode, the first switch 280c and the second switch 280d can be easily controlled without supplying a separate control pulse to the first switch 280c and the second switch 280d. This is because the current is blocked or flowed by the voltage difference across the diode. Due to the characteristics of the diode, the scan bias voltage (-Vy + Vs / 2) applied to the first switch unit 280c may be less than −200V in the second embodiment of the present invention.

The scan write voltage (-Vy) is formed at the A node, and a difference is generated by the voltage Vs / 2 at both ends of the energy storage unit. The first switch unit 280c and the second switch unit 280d are turned on so that the scan bias voltage (-Vy + Vs / 2) is less than -200V on the scan electrode.

In addition, the diode is not only easier to control than the switch, but also cheaper, thereby lowering the manufacturing cost.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains can understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. will be.

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

As described above, the plasma display apparatus according to the exemplary embodiment of the present invention has the effect of reducing the manufacturing cost by changing the driving circuit for supplying the scan pulse.

In addition, in the plasma display apparatus according to an embodiment of the present invention, since the scan bias voltage is maintained at a predetermined voltage relative to the -Vy voltage by changing the driving circuit for supplying the scan pulse, the height of the reset waveform is changed according to the characteristics of the panel. There is a more freely adjustable effect.

Claims (11)

A plasma display panel including an electrode; A sustain driver including an energy storage unit for supplying energy by charging and discharging the voltage supplied from the plasma display panel; And A scan driver configured to receive a voltage from the energy storage unit and supply a scan bias voltage Plasma display device comprising a. The method of claim 1, The sustain drive unit A rising resonance switch for supplying the voltage stored in the energy storage unit to the plasma display panel by resonance, a falling resonance switch for supplying the voltage stored in the plasma display panel to the energy storage unit by resonance, and the plasma display panel. Includes an inductor for generating an over resonance And the energy storage unit is electrically connected between the rising resonance switch and the falling resonance switch, and the falling resonance switch is electrically connected between the energy storage unit and the inductor. The method of claim 1, And a control switch configured to control a supply of a scan write voltage source for supplying a scan write voltage to the electrode in an address period and the scan bias voltage. The method of claim 3, wherein And the scan write voltage source is a negative polarity voltage. The method of claim 3, wherein The control switch unit And a second switch unit electrically connected between the energy storage unit and the scan driver, and a second switch unit electrically connected between the scan write voltage source and the energy storage unit. The method of claim 5, wherein At least one of the first switch unit or the second switch unit comprises a diode. The method of claim 6, The first switch unit includes the diode, And an anode end of the diode is electrically connected to the energy storage unit, and a cathode end of the diode is electrically connected to the driving pulse supply unit. The method of claim 6, The second switch unit includes the diode, And an anode terminal of the diode is electrically connected to the scan write voltage source, and a cathode terminal of the diode is electrically connected to the energy storage unit. The method of claim 1, And the energy storage unit comprises a capacitor. The method of claim 1, The scan bias voltage is less than -200V plasma display device. The method of claim 1, And the voltage charged in the energy storage unit is half of the sustain voltage.

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