KR100683793B1 - Method for driving plasma display panel - Google Patents

Abstract

An object of the present invention is to provide a driving method capable of precise control of wall charges in a discharge cell while minimizing reset light caused by reset discharge in a reset period for a plasma display panel having a new structure having improved luminous efficiency and permanent afterimage. do.

In order to achieve the above object, the present invention provides a plurality of unit frames in order to drive a plasma display panel in which discharge cells are defined in regions where a plurality of electrodes intersect, and the plurality of electrodes surrounds the discharge cells. The subfields are divided into subfields, each subfield has a different gray scale weight, and is divided into reset, address, and sustain periods. In the reset period, rising pulses and falling pulses are applied to the first electrode, but the magnitude of the instantaneous slope of the rising pulses and the falling pulses An object of the present invention is to provide a method of driving a plasma display panel which decreases with time.

Description

Method for driving plasma display panel {Method for driving plasma display panel}

1 is a partially separated perspective view of a three-electrode surface discharge plasma display panel according to the prior art.

FIG. 2 is a plan view of the plasma display panel of FIG. 1 taken along line II-II. FIG.

3 is an example of a plasma display panel with improved luminous efficiency and permanent afterimage driven by the method of driving a plasma display panel of the present invention.

4 is a cross-sectional view taken along the line IV-IV.

FIG. 5 is a layout view illustrating a discharge cell and an electrode structure illustrated in FIGS. 3 and 4.

6 is a timing diagram briefly illustrating a driving method for driving the plasma display panel of FIG. 3.

FIG. 7 is a simplified block diagram of a plasma display device illustrating the plasma display panel of FIG. 3 and a driving device for driving the same.

8 is a diagram illustrating a driving signal for driving the plasma display panel of FIG. 3 according to one embodiment of the present invention.

9 is another example of the plasma display panel having improved light emission efficiency and permanent afterimage driven by the plasma display panel driving method of the present invention.

10 is a cross-sectional view taken along the line VII-VII.

FIG. 11 is a layout view illustrating a discharge cell and an electrode structure illustrated in FIGS. 9 and 12.

FIG. 12 is a simplified block diagram of a plasma display device showing the plasma display panel of FIG. 9 and a driving device for driving the same.

FIG. 13 is a diagram illustrating a driving signal for driving the plasma display panel of FIG. 9 according to another embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

200, 300 ... plasma display panel of Figs.

210,310 ... first substrate 220,320 ... second substrate

212,312 ... First electrode 213,313 ... Second electrode

214,314 Bulkhead 322 Third electrode

Phosphor layer Ce ... discharge cell

701,1201 ... plasma display device of Figs.

700,1200 Image Processing Unit 702,1202 Logic Controller

704,1204 ... Y drive 706,1206 ... A drive

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and more particularly, to a driving method for a plasma display panel having a new structure in which luminous efficiency and permanent afterimage are improved.

Recently, a plasma display panel, which is drawing attention as a replacement of a conventional cathode ray tube display device, is discharged after a discharge gas is filled between two substrates on which a plurality of electrodes are formed. The phosphor formed in a predetermined pattern by the ultraviolet rays is excited to obtain a desired image.

1 is a partially separated perspective view of a three-electrode surface discharge plasma display panel according to the prior art, and FIG. 2 is a plan view of the plasma display panel of FIG. 1 taken along line II-II. A description with reference to FIGS. 1 and 2 below.

The plasma display panel 1 of FIGS. 1 and 2 includes a first panel 110 and a second panel 120.

The first panel 110 may include a first substrate 111, a first dielectric layer 115 disposed to cover the scan electrode lines 112 and the sustain electrode line 113 on a rear surface of the first substrate, and a first dielectric layer 115. A first passivation layer 116 is provided to protect the first dielectric layer 115. The scan electrode lines 112 and the sustain electrode lines 113 form a pair of sustain electrode pairs 114, and bus electrodes 112a and 113a made of a metallic material to increase conductivity, and indium tin oxide (ITO). Transparent electrodes 112b and 113b made of a transparent conductive material, and the like.

The second panel 120 covers the second substrate 121 and the address electrode line 122 formed in a direction orthogonal to a direction in which the scan electrode lines 112 and the sustain electrode lines 113 extend. The second dielectric layer 123 disposed in the direction of the first substrate from the front surface of the second substrate, the partition wall 124 partitioning discharge cells on the second dielectric layer 123, and the partition wall 124. A phosphor layer 125 disposed in a confined space and a second passivation layer 128 are provided on the entire surface of the phosphor layer 125 to protect the phosphor layer 125. Discharge gas is injected into the discharge cell Ce, which is a space defined by the partition wall 124.

In the conventional three-electrode plasma display panel shown in FIGS. 1 and 2, a frame is divided into a plurality of subfields, and each subfield is divided into a reset period, an address period, and a sustain period to display an image. However, the conventional three-electrode plasma display panel 1 has the following problems.

First, visible light emitted from the fluorescent layer 128 includes the sustain electrode lines 113, the scan electrode lines 112, and the electrode lines 106 and 107 disposed under the first substrate 110. As the substantial portion (approximately 40%) is absorbed by the first dielectric layer 115 and the first passivation layer 116 covering the portion, the luminous efficiency is low.

Second, when the conventional plasma display panel 1 as described above displays the same image for a long time, the fluorescent layer 128 is ion sputtered by the charged particles of the discharge gas, thereby providing a permanent afterimage. Cause.

Disclosure of Invention The present invention has been made to solve various problems including the above problems. For the new structure of the plasma display panel having high luminous efficiency and improved afterimage, the discharge cell is minimized while minimizing the reset light caused by the reset discharge in the reset period. It is an object of the present invention to provide a driving method capable of precise control of wall charges in the body.

In order to achieve the above object, the present invention,

In the driving method of the plasma display panel,

The plasma display panel includes a first electrode and a second electrode extending to cross each other, a discharge cell is defined in the crossing area, the first electrode and the second electrode surround the discharge cell,

In the driving method, a unit frame for displaying an image is divided into a plurality of subfields, each subfield having a reset period for initializing all discharge cells, an address period for distinguishing cells to be turned on and cells not to be turned on, and to be turned on. In the discharge cell selected as the cell, it is divided into a sustain period for performing sustain discharge according to the gray scale weight allocated to each subfield.

In the reset period, a rising pulse and a falling pulse are applied to the first electrode, and the magnitude of the instantaneous slope of the rising pulse and the falling pulse decreases with time.

According to another aspect of the present invention, the rising pulse and the falling pulse may be parabolic.

According to still another aspect of the present invention, in the reset period, the bias voltage is applied to the second electrode while the falling pulse is applied, and in the address period, the scan is sequentially performed while maintaining the high level to the first electrode. A pulse is applied, and a display data signal is applied to the second electrode in accordance with the low level of the scan pulse. In the sustain period, a sustain pulse having a high level and a low level is alternately applied to the first electrode, and the second electrode is applied to the second electrode. An intermediate level between the high level and the low level of the sustain pulse may be applied.

In order to achieve the above object, the present invention also provides a plasma display panel driving method.

The plasma display panel includes a first electrode and a second electrode extending in one direction, a third electrode extending to intersect the first electrode and the second electrode, and a discharge cell is defined in the crossing region. The first electrode, the second electrode and the third electrode surrounds the discharge cell,

In the driving method, a unit frame for displaying an image is divided into a plurality of subfields, each subfield having a reset period for initializing all discharge cells, an address period for distinguishing cells to be turned on and cells not to be turned on, and to be turned on. In the discharge cell selected as the cell, it is divided into a sustain period for performing sustain discharge according to the gray scale weight allocated to each subfield.

In the reset period, a rising pulse and a falling pulse are applied to the first electrode, and the magnitude of the instantaneous slope of the rising pulse and the falling pulse decreases with time.

According to another aspect of the present invention, the rising pulse and the falling pulse may be parabolic.

According to another aspect of the present invention, in the reset period, the bias voltage is applied to the second electrode from the falling pulse is applied,

In the address period, scan pulses having a low level are sequentially applied to the first electrode while the display data signal is applied to the third electrode according to the low level of the scan pulse, and the bias voltage is applied to the second electrode. Licensed,

In the sustain period, a sustain pulse having alternating high and low levels is applied to the first electrode and the second electrode.

In order to achieve the above object, the present invention also provides a plurality of discharge cells disposed together with a first substrate and a second substrate, and disposed between the first substrate and the second substrate together with the first substrate and the second substrate. A plasma display panel including a barrier rib defining the barrier ribs, a first electrode and a second electrode spaced apart from each other, extending in a cross direction, and surrounding the barrier rib, a phosphor layer disposed in the discharge cell, and a discharge gas in the discharge cell; And

To drive the plasma display panel, the unit frame is divided into a plurality of subfields, each subfield selected as a reset period for initializing all discharge cells, an address period for distinguishing cells to be turned on and cells not to be turned on, and cells to be turned on. And a driving unit which is divided into a sustain period in which sustain discharge is performed according to a gray scale weight assigned to each subfield in a discharge cell, and applies a drive signal divided into a reset, an address, and a sustain period to each electrode.

The driving unit is divided into a first driving unit applying a driving signal to the first electrode and a second driving unit applying a driving signal to the second electrode,

In the reset period, the first driving unit applies the rising pulse and the falling pulse, but the magnitude of the instantaneous slope of the rising pulse and the falling pulse is provided with a plasma display device.

According to another aspect of the present invention, the rising pulse and the falling pulse may be parabolic.

According to another aspect of the present invention, in the reset period, the second driver applies a bias voltage while the falling pulse is applied,

In the address period, the first driver maintains a high level and sequentially applies a scan pulse having a low level, and the second driver applies a display data signal according to the low level of the scan pulse.

In the sustain period, the first driver applies a sustain pulse alternately having a high level and a low level, and the second driver applies an intermediate level between the high level and the low level of the sustain pulse.

In order to achieve the above object, the present invention also provides a plurality of discharge cells disposed together with a first substrate and a second substrate, and disposed between the first substrate and the second substrate together with the first substrate and the second substrate. Barrier ribs defining the barrier ribs; a first electrode and a second electrode spaced apart from each other and extending in one direction and surrounding the barrier rib; and a third electrode spaced apart from and intersecting the first electrode and the second electrode and surrounding the barrier rib; A plasma display panel comprising a phosphor layer disposed in a cell and a discharge gas in the discharge cell; And

To drive the plasma display panel, a unit frame is divided into a plurality of subfields, each subfield being a reset period for initializing all discharge cells, an address period for distinguishing cells to be turned on and cells not to be turned on, and cells to be turned on. And a driving unit which is divided into a sustain period in which sustain discharge is performed according to a gray scale weight assigned to each subfield in the selected discharge cell, and applies a drive signal divided into a reset, an address, and a sustain period to each electrode.

The driving unit is divided into a first driving unit applying a driving signal to the first electrode, a second driving unit applying the driving signal to the second electrode, and a third driving unit applying the driving signal to the third electrode,

In the reset period, the first driving unit applies the rising pulse and the falling pulse, but the magnitude of the instantaneous slope of the rising pulse and the falling pulse is provided with a plasma display device.

According to another aspect of the present invention, the rising pulse and the falling pulse may be parabolic.

According to another aspect of the present invention, in the reset period, the second driving unit applies the bias voltage from the time of applying the falling pulse,

In the address period, the first driver maintains a high level and sequentially applies a scan pulse having a low level, the third driver applies a display data signal according to the low level of the scan pulse, and the second driver applies a bias voltage. Licensed,

In the sustain period, the first driver and the second driver apply a sustain pulse having alternating high and low levels.

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

3 is an example of a plasma display panel with improved luminous efficiency and permanent afterimage driven by the method of driving a plasma display panel of the present invention. FIG. 4 is a cross-sectional view taken along the line IV-IV. 4 is a layout view illustrating a discharge cell and an electrode structure illustrated in FIG. 4.

Referring to FIGS. 3 to 5, the plasma display panel 200 may include a first substrate 210, a second substrate 220, a partition 214, a first electrode 212, and a second electrode 213. And a phosphor layer 225, a first passivation film 216, and a discharge gas.

The first substrate 210 and the second substrate 220 are disposed to be spaced apart from each other.

The partition wall 214 may be integrally formed as shown in the drawing, and may be separately formed (attached to the first and second substrates 210 and 220) (front partition and rear partition). The partition wall 214 forms a discharge cell Ce, which is a space in which discharge is performed, together with the first substrate 210 and the second substrate 220. As shown in the drawing, the discharge cell Ce may be formed as an opening having a circular cross section in the partition wall 214, but is not limited thereto. The discharge cell Ce may have a cross section such as a triangle, a square, a pentagon, or an ellipse. May be formed. In addition, the partition wall 214 is shown as partitioning the discharge cells (Ce) in the form of a matrix, but is not limited to this, as long as it can form a plurality of discharge space, for example, in the waffle, delta shape in various patterns You can also partition with

In the partition wall 214, the first electrode 212 and the second electrode 213 extend in a direction intersecting with each other, surrounding the discharge cell Ce forming an opening having a circular cross section. That is, the first electrode 212 and the second electrode 213 extend in the x direction and the y direction, respectively, and are formed to be spaced apart from each other and surround the discharge cell. In the drawing, the second electrode 213 and the first electrode 212 are sequentially arranged in the direction of the second substrate (-z direction) from the first substrate, but the embodiment is not limited thereto.

It is preferable that a first passivation film 216 made of MgO or the like is formed on the outer surface of the partition wall 214 forming the discharge cell Ce. The first passivation layer 216 protects the first electrode 212 and the second electrode 213 and the partition wall 214 formed of the dielectric covering the first electrode 212 and the second electrode 213 during discharge, and easily discharges by discharging secondary electrons during discharge. Make it happen.

The phosphor layer 225 is formed on the first substrate 210, in detail, in the groove 210a formed on the first substrate in the direction of the second substrate. The position of the phosphor layer 225 is not limited to that shown in the drawings, and may be formed in a groove (not shown) formed on the second substrate in the direction of the first substrate, and on both the first substrate and the second substrate. It may be formed.

The discharge gas is filled in the discharge cell Ce, and any one or two of neon (Ne), helium (He), or argon (Ar) including Xenon gas before and after 10% as discharge gas. The above may be a mixed gas.

The first substrate 210 and the second substrate 220 are made of a material having excellent light transmittance mainly containing glass. The second substrate 220 is positioned to face away from the first substrate 210. Preferably, the first substrate 210 and the second substrate 220 are formed using substantially the same material. In this case, the thermal expansion rate of the first substrate 210 and the thermal expansion rate of the second substrate 220 are the same. There is an advantage to becoming.

The partition wall 214 prevents the first electrode 212 and the second electrode 213 from directly energizing during discharge, and the charged particles directly collide with the first electrode 212 and the second electrode 213 to damage them. It is formed as a dielectric material which can prevent the formation and induce charged particles to accumulate wall charges. Such dielectrics include PbO, B2O3, SiO2 and the like.

Since the first electrode 212 and the second electrode 213 are each applied with a predetermined voltage to perform discharge, it is preferable that the first electrode 212 and the second electrode 213 are formed of Ag, Cu, Cr, or the like having high electrical conductivity.

The phosphor layer 225 may be dried and baked after a phosphor paste in which one of the phosphors, solvents, and binders of the red, green, and blue phosphors is mixed is applied to the groove 210a of the first substrate. It is formed by roughness. Examples of the red light emitting phosphor include Y (V, P) O 4: Eu, and examples of the green light emitting phosphor include ZnSi 4 4: Mn, YBO 3: Tb, and the blue light emitting phosphor include BAM: Eu.

Meanwhile, a second passivation layer (not shown) made of MgO or the like may be formed on the entire surface of the phosphor layer 225 (-z direction). The second passivation layer prevents the phosphor layer 225 from deteriorating due to the collision of the discharge particles when the discharge occurs in the discharge cell Ce and helps the discharge to occur easily by emitting secondary electrons. Can be.

 The plasma display panel 200 illustrated in FIGS. 3 to 5 has the following advantages over the conventional plasma display panel 1.

First, separate dielectric layers for the first electrode 212 and the second electrode 213 are not needed, and the electrodes are disposed on the side of the discharge cell so as to surround the discharge cell, thereby preventing the discharge in the discharge space cell Ce. The visible light generated by the light is directly emitted through the first and / or second substrates 210 and 220, so that the luminous efficiency is increased, and a transparent electrode such as ITO is no longer necessary than in the related art.

Second, the first electrode 212 and the second electrode 213 are formed to surround the discharge cell so that the electric field is concentrated in the center of the discharge cell Ce, the plasma display panel 200 displays the same image for a long time Although the fluorescent layers 225 are not ion sputtered by the charged particles of the discharge gas, permanent afterimage can be prevented. In addition, since discharge may occur in all spaces of the discharge cell Ce, the response speed and the discharge efficiency may be increased.

6 is a timing diagram briefly illustrating a driving method for driving the plasma display panel of FIG. 3.

The unit frame for displaying an image is divided into a plurality of subfields, and each subfield is divided into a reset period, an address period, and a sustain period. The reset period is a period for initializing all the discharge cells, and the address period is a period for distinguishing the discharge cells that should be turned on and the discharge cells that should not be turned on among all the discharge cells, and the sustain period is a discharge cell selected as the discharge cells to be turned on. A sustain discharge period is performed according to the gray scale weights allocated to each subfield. The plasma display panel is driven by a time division driving method for applying a driving signal in accordance with the reset, address, and sustain periods for each subfield as described above.

In the drawing, the unit frame is divided into eight subfields SF1 to SF8, each subfield is divided into a reset period (not shown), an address period PA1 to PA8, and a sustain period PS1 to PS8. The gray scale weight is allocated from the first subfield to the eighth subfield as 1T, 2T, ... 128T, but this is only an example and the present invention is not limited thereto. That is, the number of subfields of a unit frame may be less or more than eight, and the allocation of gray scale weights for each subfield may be changed according to a design specification, unlike illustrated.

FIG. 7 is a simplified block diagram of a plasma display device illustrating the plasma display panel of FIG. 3 and a driving device for driving the same.

The structure of the plasma display panel 200 of FIG. 3 is a new electrode structure surrounding the discharge cells, and has a two-electrode structure. Therefore, the plasma display apparatus 701 of FIG. 7 is more concise than the conventional plasma display apparatus having a three-electrode structure.

Referring to FIGS. 3 to 8, the plasma display apparatus 701 of FIG. 7 includes an image processor 700, a logic controller 702, a Y driver 704, an A driver 706, and a plasma display panel 200. ).

The image processor 700 receives an external image signal such as a PC signal, a DVD signal, a video signal, or a TV signal from the outside, converts an analog signal into a digital signal, and processes the digital signal into an internal image signal. The internal video signals are 8-bit red (R), green (G), and blue (B) image data, clock signals, and vertical and horizontal sync signals, respectively.

The logic controller 702 receives an internal image signal from the image processor 700 and undergoes a gamma correction or an automatic power control (APC) step, respectively, to drive the Y drive control signal SY and the A drive control signal SA. Outputs

The Y driver 704 receives the Y driving control signal SY from the logic controller 702 and applies a driving signal to the first electrode 212 of FIG. 3, and the A driver 706 is the logic controller 702. A driving control signal SA is input from the driving signal to the second electrode 213 of FIG. 3. Hereinafter, the first electrode will also be described as the Y electrode and the second electrode as the A electrode.

The Y driver 704 applies the rising pulse and the falling pulse to the Y electrode in the reset period, but minimizes the reset light during the reset discharge and precisely controls the wall slope in the discharge cell. Allow size to decrease over time. In other words, during the rising pulse, the instantaneous slope gradually decreases from the positive value to finally have a value of zero, and during the falling pulse, the instantaneous slope gradually increases from the negative value, resulting in a zero value. To have. Examples of such rising and falling pulses may be parabolic pulses, and in addition, log waveforms may be used. In order to apply the rising pulse and the falling pulse, the Y driver 704 may include a resistive element and a capacitive element. Meanwhile, while maintaining the high level Vsch1 in the address period, the scan pulses having the low level Vscl1 are sequentially applied, and the sustain pulses having the high level Vs1 and the low level (-Vs1) are applied in the sustain period. .

The A driver 706 applies the bias voltage Vb1 while the falling pulse is applied in the reset period, and applies the display data signal having the high level Va1 in accordance with the low level Vscl1 of the scan pulse in the address period. In the sustain period, the high level Vs1 of the sustain pulse and the intermediate level Vg of the low level -Vs1 are applied. The address discharge is performed in the address period by the display data signal and the scanning pulse.

 8 is a diagram illustrating a driving signal for driving the plasma display panel of FIG. 3 according to one embodiment of the present invention.

Referring to FIGS. 3 to 8, each subfield SF is divided into a reset period PR, an address period PA, and a sustain period PS.

The reset period PR is a period for initializing all the discharge cells. In order to initialize all the discharge cells, in the reset period, the wall charge state in the discharge cells is initialized by the reset discharge. In order to perform the reset discharge, various types of pulses may be applied to the Y electrode. Conventionally, a rectangular pulse is applied, but this causes a strong discharge in the discharge cell due to a sharp rise in the potential of the high voltage, thereby deteriorating the contrast and not precisely controlling the state of the wall charge in the discharge cell. I couldn't. Therefore, the present invention applies a rising pulse and a falling pulse in order to precisely control the wall charge state in the discharge cell while the reset discharge is a weak discharge, the magnitude of the instantaneous slope of the rising pulse and the falling pulse decreases with time. Is authorized. In other words, during the rising pulse, the instantaneous slope gradually decreases from the positive value to finally have a value of zero, and during the falling pulse, the instantaneous slope gradually increases from the negative value, resulting in a zero value. To have. Examples of such rising and falling pulses may be parabolic pulses, and in addition, log waveforms may be used. A low level voltage, for example, a ground voltage Vg is applied to the A electrode, but a bias voltage Vb1 is applied during the falling pulse. The rising pulse rises from the sustain discharge voltage Vs1 to reach the rising maximum voltage Vs1 + Vset1, and the falling pulse falls from the sustain discharge voltage Vs1 and falls to the falling minimum voltage Vnf1. Due to the application of the rising pulse, negative wall charges slowly accumulate in time around the Y electrode in the discharge cell, and reset discharge occurs between the Y electrode and the A electrode. Also, due to the application of the falling pulse, the reset discharge is performed slowly between the Y electrode and the A electrode in time while the negative wall charges accumulated around the Y electrode in the discharge cell are erased. Reset discharge occurs when the potential difference between the Y electrode and the A electrode exceeds the discharge start voltage. When the rising pulse is applied as a parabolic pulse as in the present invention, the reset pulse is initially applied (the instantaneous slope of In case of large size), a large amount of negative wall charges are accumulated around the Y electrode, and at the end of application of the rising pulse (when the magnitude of the instantaneous slope is small), a small amount of negative wall charges is accumulated and the potential difference between the Y electrode and the A electrode is increased. The reset discharge is performed with a weak discharge by exceeding the discharge start voltage. In addition, when the falling pulse is initially applied (when the magnitude of the instantaneous slope is large), the negative polarity accumulated around the Y electrode is largely erased, and at the end of the application of the falling pulse (when the magnitude of the instantaneous slope is small), the negative polarity is lost. The reset discharge is performed with a weak discharge because the potential difference between the Y electrode and the A electrode exceeds the discharge start voltage while the wall charges of? As the magnitude of the instantaneous slope of the rising pulse and the falling pulse of the present invention decreases with time, it is possible to precisely control the amount of wall charge accumulated or erased around the electrode in the discharge cell. By the reset discharge, the wall charge state in the discharge cell is initialized, and the wall charge state suitable for the address discharge in the address period PA is established.

The address period PA is a period for distinguishing the discharge cells to be turned on and the discharge cells not to be turned on. In the drawing, the address discharge method, that is, a method of performing address discharge only in the discharge cells to be turned on, is limited thereto. In this case, the selective erasing method, that is, the address discharge is performed in all the discharge cells, and the erasing discharge is performed only in the discharge cells that should not be turned on. As shown in the figure, according to the write discharge method, while maintaining the high level potential Vsch1 to the Y electrode, a scanning pulse having a low level potential Vscl1 is sequentially applied to the Y electrode, and the low level potential of the scanning pulse ( In accordance with Vscl1, a display data signal having a high level potential Va1 is applied to the A electrode. Due to the application of the scanning pulse and the display data signal, address discharge is performed between the Y electrode and the A electrode in the discharge cell.After the address discharge, positive wall charges are accumulated around the Y electrode and negative wall charges are accumulated around the A electrode. do.

The sustain period PS is a period during which the sustain discharge is performed according to the gray scale weight assigned in the discharge cell selected as the cell to be turned on, and the sustain pulse having the high level (Vs1) and the low level (-Vs1) alternately is present at the Y electrode. The high potential Vs1 of the sustain pulse and the intermediate potential Vg of the low level (-Vs1) are applied to the A electrode. The high level potential of the sustain pulse is also referred to as the sustain discharge voltage Vs1. The number of sustain pulses is applied in proportion to the gray scale weight. That is, the gradation is expressed by the gradation weight assigned by the number of sustain discharges. First, when the high-level potential Vs1 of the sustain pulse is applied to the Y electrode, positive wall charges accumulated around the Y electrode in the discharge cell, negative wall charges accumulated around the A electrode, and applied to the Y electrode The sustain discharge is performed by the potential Vs1 and the potential Vg applied to the A electrode. After the completion of the sustain discharge, positive wall charges are accumulated around the A electrode and negative wall charges are accumulated around the Y electrode. Next, when the low-level potential (-Vs1) of the sustain pulse is applied to the Y electrode, the negative wall charges accumulated around the Y electrode in the discharge cell, the positive wall charges accumulated around the A electrode, and Y The sustain discharge is performed by the potential (-Vs1) applied to the electrode and the potential (Vg) applied to the A electrode, and after the end of the sustain discharge, the negative wall charges are around the A electrode, and the positive wall is around the Y electrode. Electric charges will accumulate. In this manner, sustain discharge is continuously performed according to the number of sustain pulses according to the gray scale weight.

FIG. 9 is another example of the plasma display panel with improved luminous efficiency and permanent afterimage driven by the method of driving the plasma display panel of the present invention. FIG. 10 is a cross-sectional view taken along the line VII-VII, and FIG. 12 is a layout view showing the structure of the discharge cell and the electrode shown in FIG.

The plasma display panel 300 of FIGS. 9 to 11 is similar to the plasma display panel 200 of FIGS. 3 to 5, except that the plasma display panel of FIGS. 3 to 5 has a two-electrode structure. In contrast, the plasma display panel of FIGS. 9 to 11 has a three-electrode structure. Hereinafter, the differences will be described.

9 to 11, the plasma display panel 300 includes a first substrate 310, a second substrate 320, a partition 314, a first electrode 312, and a second electrode 313. And a third electrode 322, phosphor layer 325, first protective film 316, and discharge gas.

The description of the first substrate 310, the second substrate 320, the partition wall 314, the phosphor layer 325, the first passivation layer 316, and the discharge gas is replaced with the description of FIGS. 3 to 5.

The first electrode 312, the second electrode 313, and the third electrode 322 are formed so as to be spaced apart from each other, surrounding the discharge cells Ce forming an opening having a circular cross section in the partition wall. The first electrode 312 and the second electrode 313 extend in one direction (x direction), and the third electrode 322 crosses the directions in which the first electrode 312 and the second electrode 313 extend. Direction (y direction). Meanwhile, in the drawing, the second electrode 313, the third electrode 322, and the first electrode 312 are arranged in the direction of the second substrate from the first substrate (-z direction), but are not limited thereto. It is possible to arrange variously according to design specification.

The plasma display panel 300 illustrated in FIGS. 9 to 11 has the same advantages as those of the plasma display panel illustrated in FIGS. 3 to 5.

FIG. 12 is a simplified block diagram of a plasma display device showing the plasma display panel of FIG. 9 and a driving device for driving the same.

Since the plasma display device 1201 of FIG. 12 is similar to the plasma display device 701 of FIG. 7, a description thereof will be mainly given.

9 to 13, the plasma display apparatus 1201 of FIG. 12 includes an image processor 1200, a logic controller 1202, a Y driver 1204, an A driver 1206, and an X driver 1208. And a plasma display panel 300.

The image processor 1200 performs the same function as the image processor 700 of FIG. 7.

The logic controller 1202 receives an internal image signal from the image processor 1200 and undergoes a gamma correction and an automatic power control (APC) step, respectively, to drive the Y drive control signal SY and the A drive control signal SA. And an X driving control signal SX.

The Y driver 1204 receives the Y drive control signal SY from the logic controller 1202 and applies a drive signal to the first electrode 312 of FIG. 9, and the X driver 1208 is the logic controller 1202. A driving signal is applied to the second electrode (313 in FIG. 9) by receiving the X driving control signal SX from the A driving unit 1206, and the A driving control signal SA is input from the logic controller 1202. In response, a driving signal is applied to the third electrode (322 in FIG. 9). Hereinafter, the first electrode will also be described as the Y electrode, the second electrode as the X electrode, and the third electrode as the A electrode.

The Y driver 1204 applies a rising pulse and a falling pulse to the Y electrode in the reset period, but minimizes the reset light during the reset discharge and precisely controls the wall slope in the discharge cell. Allow size to decrease over time. In other words, during the rising pulse, the instantaneous slope gradually decreases from the positive value to finally have a value of zero, and during the falling pulse, the instantaneous slope gradually increases from the negative value, resulting in a zero value. To have. Examples of such rising and falling pulses may be parabolic pulses, and in addition, log waveforms may be used. In order to apply the rising pulse and the falling pulse, the Y driver 1204 may include a resistive element and a capacitive element. Meanwhile, while maintaining the high level Vsch1 in the address period, the scan pulses having the low level Vscl2 are sequentially applied, and the sustain pulses having the high level Vs1 and the low level Vg are alternately applied in the sustain period. do.

The X driver 1208 applies the bias voltage Vb2 from the time of applying the falling pulse in the reset period to the address period, and applies the sustain pulse in the sustain period. The sustain pulses output from the Y driver 1204 and the sustain pulses output from the X driver 1208 alternate with each other, whereby sustain discharge is performed in the discharge cell.

The A driver 1206 applies a display data signal in accordance with the scan pulse in the address period. The address discharge is performed in the address period by the display data signal and the scanning pulse. In the sustain period, the low-level potential Vg is applied.

FIG. 13 is a diagram illustrating a driving signal for driving the plasma display panel of FIG. 9 according to another embodiment of the present invention.

The driving method of FIG. 9 is based on the time division gray scale representation method, which is based on the method shown in FIG. 6. Meanwhile, since the driving signal of FIG. 13 is similar to the driving signal of FIG. 8, the description will be mainly focused on the difference.

9 to 13, each subfield SF is divided into a reset period PR, an address period PA, and a sustain period PS.

In the reset period PR, the wall charge state in the discharge cell is initialized by the reset discharge. In order to perform the reset discharge, various types of pulses may be applied to the Y electrode. Conventionally, a rectangular pulse is applied, but this causes a strong discharge in the discharge cell due to a sharp rise in the potential of the high voltage, thereby deteriorating the contrast and not precisely controlling the state of the wall charge in the discharge cell. I couldn't. Therefore, the present invention applies a rising pulse and a falling pulse in order to precisely control the wall charge state in the discharge cell while the reset discharge is a weak discharge, the magnitude of the instantaneous slope of the rising pulse and the falling pulse decreases with time. Is authorized. In other words, during the rising pulse, the instantaneous slope gradually decreases from the positive value to finally have a value of zero, and during the falling pulse, the instantaneous slope gradually increases from the negative value, resulting in a zero value. To have. Examples of such rising and falling pulses may be parabolic pulses, and in addition, log waveforms may be used. On the other hand, a low level voltage, for example, a ground voltage Vg is applied to the A electrode, and a ground voltage Vg is applied to the X electrode, but a bias voltage Vb2 is applied when a falling pulse is applied. The rising pulse rises from the sustain discharge voltage Vs2 to reach the rising maximum voltage Vs2 + Vset2, and the falling pulse falls from the sustain discharge voltage Vs2 to the falling minimum voltage Vnf2. Due to the application of the rising pulse, negative wall charges slowly accumulate in time around the Y electrode in the discharge cell, and reset discharge occurs between the Y electrode and the A electrode and between the Y electrode and the X electrode. Also, due to the application of the falling pulse, the reset discharge is performed slowly between the Y electrode and the A electrode and between the Y electrode and the X electrode in time while the negative wall charges accumulated around the Y electrode in the discharge cell are erased. Reset discharge occurs when the potential difference in the discharge cell exceeds the discharge start voltage. When the rising pulse is applied as a parabolic pulse as in the present invention, when the rising pulse is initially applied (the magnitude of the instantaneous slope is large) ), The negative wall charges are accumulated around the Y electrode, and when the rising pulse is applied (when the magnitude of the instantaneous slope is small), the negative wall charges are accumulated and the potential difference in the discharge cell exceeds the discharge start voltage. The discharge is performed with a weak discharge. In addition, when the falling pulse is initially applied (when the magnitude of the instantaneous slope is large), the negative polarity accumulated around the Y electrode is largely erased, and at the end of the application of the falling pulse (when the magnitude of the instantaneous slope is small), the negative polarity is lost. The reset discharge is performed with a weak discharge because the potential difference in the discharge cells exceeds the discharge start voltage while the wall charges of? As the magnitude of the instantaneous slope of the rising pulse and the falling pulse of the present invention decreases with time, it is possible to precisely control the amount of wall charge accumulated or erased around the electrode in the discharge cell. By the reset discharge, the wall charge state in the discharge cell is initialized, and the wall charge state suitable for the address discharge in the address period PA is established.

The address period PA is a period for distinguishing the discharge cells to be turned on and the discharge cells not to be turned on. In the drawing, the address discharge method, that is, a method of performing address discharge only in the discharge cells to be turned on, is not limited thereto. In addition, the selective erasing method, that is, the address discharge is performed in all the discharge cells, and the erasing discharge is performed only in the discharge cells that should not be turned on. As shown in the figure, according to the write discharge method, while maintaining the high level potential Vsch2 to the Y electrode, the scan pulses having the low level potential Vscl2 are sequentially applied, and the low level potential of the scan pulse ( In accordance with Vscl2, a display data signal having a high-level potential Va2 is applied to the A electrode, and a bias voltage Vb2 is subsequently applied to the X electrode. Due to the application of the scanning pulse and the display data signal, address discharge is performed between the Y electrode and the A electrode in the discharge cell.After the address discharge, positive wall charges are formed around the Y electrode, and negative wall charges are around the A electrode. Negative wall charges are accumulated around the X electrode.

The sustain period PS is a period during which the sustain discharge is performed according to the gray scale weight assigned in the discharge cell selected as the cell to be turned on. It is applied alternately, and the intermediate potential Vg of the high level and the low level of the sustain pulse is applied to the A electrode. The high level potential of the sustain pulse is also referred to as the sustain discharge voltage Vs2. The number of sustain pulses is applied in proportion to the gray scale weight. That is, the gradation is expressed by the gradation weight assigned by the number of sustain discharges. First, when the high-level potential Vs2 of the sustain pulse is applied to the Y electrode, positive wall charges accumulated around the Y electrode in the discharge cell, negative wall charges accumulated around the X electrode, and applied to the Y electrode The sustain discharge is performed by the potential Vs2 and the potential Vg applied to the X electrode. After the completion of the sustain discharge, positive wall charges are accumulated around the X electrode, and negative wall charges are accumulated around the Y electrode. Next, when the high-level potential Vs2 of the sustain pulse is applied to the X electrode, the negative wall charges accumulated around the Y electrode in the discharge cell, the positive wall charges accumulated around the X electrode, and the Y electrode The sustain discharge is performed by the potential Vg applied to the X electrode and the potential Vs2 applied to the X electrode, and after the end of the sustain discharge, negative wall charges are formed around the X electrode, and positive wall charges are around the Y electrode. Will accumulate. In this manner, sustain discharge is continuously performed according to the number of sustain pulses according to the gray scale weight.

According to the present invention as described above, the following effects can be obtained.

First, the plasma display panel of the new structure has improved light emission efficiency, permanent afterimage, and the like.

Second, according to the driving method of the present invention for the plasma display panel of the new structure, while applying the rising pulse and the falling pulse of the reset period, since the magnitude of the instantaneous slope of the rising pulse and the falling pulse is reduced with time, the reset The discharge is performed by weak discharge, and the wall charge in the discharge cell can be precisely controlled.

Third, compared to the case where the reset discharge is performed by the strong discharge due to the application of the conventional rectangular pulse waveform, there is an effect that the contrast is improved.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (10)

In the driving method of the plasma display panel, The plasma display panel includes a first electrode and a second electrode extending to cross each other, a discharge cell is defined in the crossing area, the first electrode and the second electrode surround the discharge cell, In the driving method, a unit frame for displaying an image is divided into a plurality of subfields, each subfield having a reset period for initializing all discharge cells, an address period for distinguishing cells to be turned on and cells not to be turned on, and In the discharge cell selected as the cell to be divided into sustain periods for performing sustain discharge according to the gray scale weights assigned to each subfield, In the reset period, a rising pulse and a falling pulse are applied to the first electrode, and the magnitude of the instantaneous slope of the rising pulse and the falling pulse decreases with time. The method of claim 1, The rising pulse and the falling pulse are parabolic (parabolic) drive method of the plasma display panel. The method of claim 1, And a bias voltage is applied to the second electrode while the falling pulse is applied in the reset period. The method of claim 1, In the address period, a scan pulse having a low level is sequentially applied to the first electrode while a display data signal is applied to the second electrode according to a low level of the scan pulse. A method of driving a plasma display panel. The method of claim 1, In the sustain period, a sustain pulse having a high level and a low level is alternately applied to the first electrode, and an intermediate level between a high level and a low level of the sustain pulse is applied to the second electrode. How to drive the display panel. In the driving method of the plasma display panel, The plasma display panel includes a first electrode and a second electrode extending in one direction, and a third electrode extending to intersect the first electrode and the second electrode. The first electrode, the second electrode, and the third electrode surround the discharge cell; In the driving method, a unit frame for displaying an image is divided into a plurality of subfields, each subfield having a reset period for initializing all discharge cells, an address period for distinguishing cells to be turned on and cells not to be turned on, and In the discharge cell selected as the cell to be divided into sustain periods for performing sustain discharge according to the gray scale weights assigned to each subfield, In the reset period, a rising pulse and a falling pulse are applied to the first electrode, and the magnitude of the instantaneous slope of the rising pulse and the falling pulse decreases with time. The method of claim 6, The rising pulse and the falling pulse are parabolic (parabolic) drive method of the plasma display panel. The method of claim 6, And in the reset period, a bias voltage is applied to the second electrode from the time of applying the falling pulse. The method of claim 6, In the address period, a scan pulse having a low level is sequentially applied to the first electrode while a display data signal is applied to the third electrode in accordance with a low level of the scan pulse. A method of driving a plasma display panel, characterized in that a bias voltage is applied to an electrode. The method of claim 6, And a sustaining pulse having a high level and a low level alternately applied to the first electrode and the second electrode in the sustain period.

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