KR20070094094A - Plasma display panel and method for driving the same - Google Patents

Abstract

A plasma display panel and a driving method of the same are provided to reduce power consumption and to increase light emitting efficiency by operating X electrodes separated from sustain electrodes in addressing period and writing discharge period. A front substrate(210) is disposed opposite to a rear substrate(220). A front dielectric layer(245) and a rear dielectric layer(240) are formed on the front substrate and the rear substrate, respectively. A plurality of address electrodes(230) are disposed within the rear dielectric layer. A plurality of discharge cells(280) are defined by a barrier rib between the front and rear substrates. A plurality of phosphor layers(280R,280G,280B) are disposed within each of the discharge cells. A plurality of X electrodes(260) are disposed within the front dielectric layer in a direction crossing each of the address electrodes. The X electrodes include a pair of electrode members which are separated in the direction crossing each of the address electrodes. One of the electrode members is operated in an addressing period. The other electrode member is operated in a sustain discharge period. A plurality of Y electrodes(270) are disposed within the front dielectric in the direction crossing each of the address electrodes.

Description

Plasma display panel and method for driving the same

1 is an exploded perspective view showing a portion of a conventional plasma display panel removed;

2 is an exploded perspective view illustrating a part of the plasma display panel according to an embodiment of the present invention;

3 is a partial plan view showing an arrangement state of sustain electrode pairs in a discharge cell in the plasma display panel shown in FIG. 2;

<Brief description of symbols for the main parts of the drawings>

210 ... front board 220 ... back board

230 ... address electrode 240, 245 ... dielectric layer

250 ... shield 260 ... X electrode

270 ... Y electrode 280 ... discharge cell

280R, 280G, 280B ... Phosphor 290 ... Bulkhead

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel having an improved sustain electrode suitable for discharge efficiency and low power consumption, and a driving method thereof.

In general, a plasma display panel is a flat panel display device that discharges a sealed discharge gas between two substrates on which electrodes are formed, and excites a phosphor layer by ultraviolet rays generated by the discharge to realize a desired image.

The display device employing such a plasma display panel has a large screen, high quality, ultra-thin, light weight and excellent wide viewing angle, and is simpler to manufacture than other flat panel display devices and is easy to be enlarged. As the spotlight.

The plasma display panel is classified into a direct current (DC) type, an alternating current (AC) type, and a hybrid type according to a driving voltage applied to a discharge cell, and classified into a counter discharge type and a surface discharge type according to an arrangement of electrodes.

The DC plasma display panel has a structure in which all electrodes are exposed to a discharge space, and charges are directly transferred between corresponding electrodes. On the other hand, in the AC plasma display panel, at least one electrode is embedded in the dielectric layer, and discharge is performed by an electric field of wall charge instead of direct charge transfer between the corresponding electrodes.

In the opposite discharge type plasma display panel, an address electrode and a sustain electrode are provided to face each pixel, and addressing discharge and sustain discharge are generated between the two electrodes. On the other hand, in the surface discharge plasma display panel, an address electrode and corresponding X and Y electrodes are provided for each unit pixel to generate addressing discharge and sustain discharge.

BACKGROUND ART A direct current type plasma display panel has been recently adopted a plasma display panel having an alternating surface discharge structure due to a problem of direct charge transfer between corresponding electrodes, causing serious electrode damage.

1 is an exploded perspective view showing a portion of a conventional plasma display panel cut out. Referring to FIG. 1, a plasma display panel includes a front substrate 110 and a rear substrate 120 disposed to face the front substrate 110. The inner surface of the front substrate 110 is provided with a pair of sustain electrodes of the X electrode 160 and the Y electrode 170. The X electrode 160 includes a transparent electrode 161 and a bus electrode 162, and the Y electrode 170 includes a transparent electrode 161 and a bus electrode 172. In addition, a dielectric layer 145 formed entirely on the inner surface of the front substrate 110 to cover the X electrode 160 and the Y electrode 170, and a protective film 150 coated on the surface of the dielectric layer 145. Equipped.

On the inner surface of the back substrate 120, an address electrode 130 disposed in a direction crossing the X and Y electrodes 160 and 170, and a dielectric layer 140 disposed to cover the address electrode 130. ). The discharge cell 180 is defined by the partition wall 190 disposed between the front and rear substrates 110 and 120 to form a discharge space, and the partition 190, the front substrate 110, and the rear substrate. The phosphor layers 180R, 180G, and 180B are disposed in the discharge cells 180 defined by the 120.

In the AC-type surface discharge plasma display panel, the address electrode 130 is formed on the rear substrate 120 and the X and Y electrodes 261 and 265 are formed on the front substrate 110. As a result, sustain discharge occurs in the selected discharge cell to emit visible light to the front substrate.

In the conventional plasma display panel, the discharge cells have a rectangular structure in which the width in the horizontal direction is longer than the width in the vertical direction, and a pair of sustain electrodes are arranged side by side to correspond to one discharge cell so that a discharge gap is formed at the center of the discharge cell. to form a gap. When the discharge gap between the pair of sustain electrodes is small in one discharge cell, the discharge efficiency is reduced. On the other hand, when the discharge gap between the pair of sustain electrodes increases, the discharge voltage increases, there is a problem that the power consumption increases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide a plasma display panel and a method of driving the same, which improve light emitting efficiency and reduce power consumption by improving an electrode structure of a sustain electrode.

In order to achieve the above object, the plasma display panel of the present invention includes a front substrate and a rear substrate disposed to face each other; A front dielectric layer and a back dielectric layer formed on the front substrate and the back substrate, respectively; Address electrodes disposed in the back dielectric layer; Discharge cells provided by a partition between the front substrate and the rear substrate and discharged therein; Phosphor layers disposed in each of the discharge cells and having any one color of red, green, and blue; A pair of electrode members disposed in the front dielectric layer in a direction intersecting the respective address electrodes, each separated in a direction intersecting the address electrodes, wherein one electrode member of the pair of electrode members operates in an addressing section; And the other electrode member includes X electrodes operating in the sustain discharge section; And Y electrodes disposed in the front surface dielectric in a direction crossing the respective address electrodes.

The Y electrode and the Y electrode are arranged side by side in one discharge cell, the one electrode member of each X electrode is arranged side by side adjacent to the Y electrode, the other electrode member is the one electrode The members are arranged side by side with the Y electrode therebetween.

Each electrode member of the X electrode may be a bus electrode arranged in a direction crossing the address electrode; And a protruding electrode protruding from the bus electrode. The protruding electrodes are arranged to face each other between the bus electrodes in the discharge cell.

The Y electrode includes a pair of bus electrodes arranged in a direction crossing the address electrode; And a protruding electrode protruding from the bus electrode in each discharge cell. Each protruding electrode is commonly connected to the pair of bus electrodes in each discharge cell.

In addition, the present invention includes a front substrate and a rear substrate disposed to face each other; A front dielectric layer and a back dielectric layer formed on the front substrate and the back substrate, respectively; Address electrodes disposed in the back dielectric layer; Discharge cells provided by a partition between the front substrate and the rear substrate and discharged therein; Phosphor layers disposed in each of the discharge cells and having any one color of red, green, and blue; X electrodes disposed in the front dielectric layer in a direction crossing the respective address electrodes, each X electrode including a pair of electrode members separated in a direction crossing the address electrodes; And Y electrodes disposed in the front surface dielectric in a direction crossing the respective address electrodes.

In the address period during driving of the plasma display panel, a scan pulse is provided to the address electrode, a predetermined bias voltage is provided to one electrode member of the X electrode and a Y electrode, and the other electrode member of the X electrode is provided. Plot it. In the sustain discharge section, a sustain pulse is provided to the address electrode, a predetermined voltage is provided to the other electrode member and the Y electrode of the X electrode, and one electrode member of the X electrode is floated.

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

2 is an exploded perspective view showing a portion of the plasma display panel according to the embodiment of the present invention cut away. FIG. 3 is a plan view illustrating an arrangement state of sustain electrode pairs in a discharge cell in the plasma display panel of FIG. 2.

2 and 3, the plasma display panel includes a front substrate 210 and a rear substrate 220 disposed to face the front substrate 210. The front dielectric layer 245 and the rear dielectric layer 240 are formed on the front substrate 210 and the rear substrate 220, respectively. The front dielectric layer 245 is covered by the passivation layer 250. The passivation layer 250 is to prevent dielectric breakdown of the front dielectric layer 245 and to increase secondary electron emission, and includes magnesium oxide (MgO).

The front substrate 210 includes a transparent glass substrate including components such as PbO, SiO 2, B 2 O 3, and the like so that visible light for displaying an image can be transmitted therethrough. The rear substrate 220 may also include a transparent glass substrate similar to the front substrate 210. In this case, since the back substrate 220 is not positioned on a path through which visible light generated in the discharge space of the discharge cell 280 of the discharge cell proceeds, the rear substrate 220 does not necessarily need to be provided with a transparent glass substrate. It may be provided with a substrate member. The front substrate 210 and the rear substrate 220 are sealed to each other by frit glass.

The address electrode 230 is arranged on the inner surface of the back substrate 220. The address electrodes 230 are arranged in a direction parallel to the Y direction and have a stripe shape arranged to be spaced apart by a predetermined interval in the X direction. The address electrode 230 is arranged for each discharge cell 280 and may include a metal material having excellent conductivity, for example, Ag, Au, Cu, or the like. Although the address electrode 230 has a stripe-shaped pattern corresponding to each of the discharge cells 280 to apply a voltage for selecting the discharge cells 280 to start discharge, it is not necessarily limited thereto. According to the shape of the cell 280 may have a variety of patterns.

The address electrode 230 is covered by a back dielectric layer 240 formed on the back substrate 220 to be embedded. In the exemplary embodiment of the present invention, the back dielectric layer 240 is formed on the back substrate so as to cover only the X electrode 261. However, the back dielectric layer 240 may be formed on the front surface of the substrate.

A plurality of discharge cells 280 are partitioned between the front dielectric layer 245 of the front substrate 210 and the rear dielectric layer 240 of the rear substrate 220 to prevent crosstalk between the discharge cells. Partition 290 is disposed. The partition wall 290 is disposed parallel to the address electrode 230, that is, parallel to the horizontal direction of the barrier member 291 and the address electrode 230. A vertical partition member 292 is provided.

The discharge cell 280 is partitioned by the partition wall 290 to form a discharge space. As shown in FIGS. 2 and 3, the partition wall 290 has a lattice shape formed by the horizontal partition member 291 and the vertical partition member 292, and the discharge is defined by the partition wall 290. Although the cell 280 is illustrated as having a rectangular parallelepiped shape, the cell 280 is not necessarily limited thereto, and the partition wall 290 may have various shapes to form a plurality of discharge cells 270, and accordingly, the discharge cells 280 may be formed. May have various forms. In addition, in the present exemplary embodiment, the partition wall 290 is disposed on the rear dielectric layer 240, but the present invention is not limited thereto, and the partition wall 290 may be disposed on the rear substrate 220.

For example, the partition wall 290 may have a closed partition wall shape such as a matrix or delta type as well as an open partition wall shape such as a stripe type or a meander type. In addition, in the case of the closed partition wall, the discharge cells 280 formed by the partition wall 290, as in the embodiment of the present invention, may have a shape such as a circle or an oval, as well as a polygon such as a triangle or a pentagon, in addition to a rectangle. Can be.

R, G, and B phosphor layers 280R, 280G, and 280B are respectively disposed in the discharge cells 280, and the R, G, and B phosphor layers 280R, 200G, and 200B are formed in the partition walls 290. It is formed by being applied to the upper surface of the back dielectric layer 240 surrounded by the side and the partition wall 290. The R, G, and B phosphor layers 280R, 280G, and 280B may be coated on any surface of the discharge cell 280, but transmittance of visible light emitted from the R, G, and B phosphor layers 280R, 280G, and 280B. Considering such, it is preferable that the coating is applied to cover the side surface of the partition wall 290 and the bottom surface of the back substrate 220. The red light emitting phosphor may include Y (V, P) O 4: Eu, and the green light emitting phosphor may include ZnSiO 4: Mn, YbO 3: Tb, and the blue light emitting phosphor may be BAM: Eu. Various phosphors can be used. In the discharge space of each of the discharge cells 280 to which the R, G, and B phosphors 280R, 280G, and 280B are applied, a discharge gas in which neon (Ne), xenon (Xe), etc. are mixed is generated, and is generated during discharge. Visible light is generated by being excited by the ultraviolet rays.

The X electrode 260 and the Y electrode 270 constituting the sustain electrode are disposed on the inner surface of the front substrate 210. The X electrode 260 and the Y electrode 270 both include a pair of bus electrodes 261 and 264 and 271 and 272. The X electrode 260 and the Y electrode 270 are covered and embedded by the front dielectric layer 245. The X electrode 260 includes a pair of electrode members. The first electrode member includes a first bus electrode 261 disposed in an X direction that crosses the address electrode 230, and a first protrusion electrode 162 protruding from the first bus electrode 261. do. The second electrode member includes a second bus electrode 263 disposed in an X direction that crosses the address electrode 230, and a second protrusion electrode 264 protruding from the second bus electrode 263. do.

In the X electrode 260, the protruding electrodes 262 and 263 protruding from the bus electrodes 261 and 264 are separated to electrically separate the pair of electrode members. The first bus electrode 261 and the second bus electrode 264 are arranged parallel to each other. The first and third protruding electrodes 262 and 263 are electrically connected to the first and second bus electrodes 261 and 264, respectively. It is disposed to face between the first and second bus electrodes 261 and 264.

The first bus electrode 261 and the second bus electrode 264 apply voltages to the first and second protruding electrodes 262 and 263, respectively, and thus have excellent conductivity, for example, silver (Ag). ), Copper (Cu) and the like are preferable. In addition, the first protrusion electrode 262 and the second protrusion electrode 263 may be formed of ITO or the like so that visible light emitted from the R, G, and B fluorescent layers 280R, 280G, and 280B of the discharge cell 280 is transmitted. It is preferable to form the same transparent conductive film.

The Y electrode 270 is electrically connected to the pair of bus electrodes 271 and 272 arranged in the X direction, which intersects the address electrode 230, and the pair of bus electrodes 271 and 272. And a protruding electrode 273 disposed therebetween. In the Y electrode 270, the protruding electrode 273 is electrically connected to the pair of bus electrodes 271 and 272 and disposed in each of the discharge cells 280. Since the pair of bus electrodes 271 and 272 apply a voltage to the protruding electrode 273, similarly to the bus electrodes 261 and 264 of the X electrode 260, a metal having high conductivity, for example, silver ( Ag), copper (Cu), or the like is preferably included. In addition, the protruding electrode 270 is similar to the protruding electrodes 262 and 263 of the X electrode 260, and the visible light emitted from the R, G, and B fluorescent layers 280R, 280G, and 280B of the discharge cell 280. It is preferable to form a transparent conductive film such as ITO or the like so as to transmit light.

In the present invention, the X electrode 260 of the pair of sustain electrodes is divided into one pair of electrode members so that one electrode member acts as a scan electrode and the other electrode member contributes to a write discharge, and the Y electrode ( 270 is configured to operate as a conventional scan electrode, the operation thereof will be described in detail.

First, when a predetermined address voltage is applied to the address electrode 230 and the Y electrode 270 from an external power source, a corresponding discharge cell of the plurality of discharge cells 280 is selected, and the discharge of the selected discharge cell 280 is performed. Wall charges are formed in the space. Subsequently, when a positive voltage having a predetermined level is applied to the X electrode 260 and a voltage higher than the voltage applied to the X electrode 270 is applied to the Y electrode 270, the X electrode 260 and the Y electrode 270 are applied. The wall charges are moved by the voltage difference between them. In this case, a positive bias voltage is provided to the second bus electrode 262 and the second protruding electrode 263 of the X electrode 260, and the first bus constituting the first electrode member. The electrode 261 and the first protruding electrode 262 are floated.

At this time, since the address electrode 230 is not divided, a sufficient electrode area for addressing is maintained, and a second electrode arranged adjacent to the address electrode 230 among the pair of electrode members constituting the X electrode 260 is provided. It is possible to reduce power consumption by addressing using a member.

As the wall charges move as described above, the plasma charges are generated by colliding with the discharge gas atoms in the discharge space of the discharge cells 280. Over time, if the difference between the voltages applied to the X electrode 260 and the Y electrode 270 is kept sufficiently large, the electric field formed between the two electrodes 260 and 270 is gradually concentrated. Accordingly, the discharge is diffused into the entire discharge space of the discharge cell 280. At this time, the first bus electrode 261 and the first protruding electrode 262 of the X electrode 260 are floated, and the second bus electrode 264 constituting the second electrode member is floated. Positive bias voltage is applied to the second and second electrode 265. In this way, by maintaining the discharge of the first electrode member disposed at a long distance from the address electrode 230 of the pair of electrode members of the X electrode 260 in the discharge holding period, the discharge cap is increased to increase the discharge efficiency. Therefore, power consumption is reduced.

The ultraviolet light generated by the discharge excites the fluorescent material of the phosphor layers 280R, 280G, and 280B of the discharge cell 280 to generate visible light, and the visible light is emitted from the discharge cell 280 to produce a desired image. Will be implemented.

As described above, according to the plasma display panel of the present invention, since the X electrodes of the sustain electrodes are divided so as to operate during addressing and writing discharge, respectively, power consumption and light emission efficiency can be reduced. In addition, since four electrodes are arranged in one discharge cell, the image quality can be improved by improving contrast during discharge.

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

Claims (8)

A front substrate and a rear substrate disposed to face each other; A front dielectric layer and a back dielectric layer formed on the front substrate and the back substrate, respectively; Address electrodes disposed in the back dielectric layer; Discharge cells provided by a partition between the front substrate and the rear substrate and discharged therein; Phosphor layers disposed in each of the discharge cells and having any one color of red, green, and blue; A pair of electrode members disposed in the front dielectric layer in a direction intersecting the respective address electrodes, each separated in a direction intersecting the address electrodes, wherein one electrode member of the pair of electrode members operates in an addressing section; And the other electrode member includes X electrodes operating in the sustain discharge section; And And Y electrodes disposed in the front dielectric in a direction crossing the respective address electrodes. The method of claim 1, The Y electrode and the Y electrode are arranged side by side in one discharge cell, the one electrode member of each X electrode is arranged side by side adjacent to the Y electrode, the other electrode member is the one electrode And a member arranged side by side with the Y electrode therebetween. The method of claim 2, Each electrode member of the X electrode A bus electrode arranged in a direction crossing the address electrode; And Protruding electrode protruding from the bus electrode, And the protruding electrodes are arranged to face each other between the bus electrodes in the discharge cell. The method according to any one of claims 1 to 3, The Y electrode includes a pair of bus electrodes arranged in a direction crossing the address electrode; And Protruding electrode protruding from the bus electrode in each discharge cell, Wherein each of the protruding electrodes is commonly connected to the pair of bus electrodes in each of the discharge cells. A front substrate and a rear substrate disposed to face each other; A front dielectric layer and a back dielectric layer formed on the front substrate and the back substrate, respectively; Address electrodes disposed in the back dielectric layer; Discharge cells provided by a partition between the front substrate and the rear substrate and discharged therein; Phosphor layers disposed in each of the discharge cells and having any one color of red, green, and blue; X electrodes disposed in the front dielectric layer in a direction crossing the respective address electrodes, each X electrode including a pair of electrode members separated in a direction crossing the address electrodes; And A driving method of a plasma display panel including Y electrodes disposed in the front surface dielectric in a direction crossing the address electrodes. In the address period, a scan pulse is provided to the address electrode, a predetermined bias voltage is provided to one electrode member and a Y electrode of the X electrode, and the other electrode member of the X electrode is floated. In the sustain discharge section, a sustain pulse is provided to the address electrode, a predetermined voltage is supplied to the other electrode member and the Y electrode of the X electrode, and the plasma display panel is driven to float the electrode member of the X electrode. Way. The method of claim 5, The Y electrode and the Y electrode are arranged side by side in one discharge cell, the one electrode member of each X electrode is arranged side by side adjacent to the Y electrode, the other electrode member is the one electrode And a member arranged in parallel with the Y electrode. The method of claim 6, Each electrode member of the X electrode A bus electrode arranged in a direction crossing the address electrode; And Protruding electrode protruding from the bus electrode, And the protruding electrodes are arranged to face each other between the bus electrodes in the discharge cell. The method according to any one of claims 5 to 7, The Y electrode includes a pair of bus electrodes arranged in a direction crossing the address electrode; And Protruding electrode protruding from the bus electrode in each discharge cell, Wherein each of the protruding electrodes is commonly connected to the pair of bus electrodes in each of the discharge cells.

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