KR100467687B1 - Plasma display panel - Google Patents

Abstract

A plasma display panel is disclosed. The present invention provides a front substrate comprising a common and scan electrode, a bus electrode formed on a bottom surface thereof, a first dielectric layer filling the electrodes, a protective film layer protecting the dielectric layer, and facing the front substrate. An address electrode orthogonal to the common and scan electrodes, a second dielectric layer filling the electrode, a partition wall disposed between the second dielectric layer, and a red, green, and blue phosphor layer applied inside the partition wall. A black mattress layer is formed in a non-discharge area corresponding to the outside of the display area in which the common and scan electrodes and the address electrodes cross each other to form an image in the plasma display panel having the rear substrate.

Description

Plasma display panel {Plasma display panel}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and more particularly, to a plasma display panel having an improved structure so as to prevent a discharge phenomenon from occurring in a non-discharge region and to lower contrast.

In general, a plasma display panel inserts and discharges a discharge gas between two substrates coated with a plurality of electrodes, and then applies a discharge voltage. When the gas emits light between the two electrodes due to the discharge voltage, the display device implements a desired number, letter or graphic by applying an appropriate pulse voltage to address the intersection of the two electrodes.

The plasma display panel may be classified into a direct current type and an alternating current type according to a type of driving voltage applied to a discharge cell, for example, a discharge type, and may be classified into a counter discharge type and a surface discharge type according to the configuration of the 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 instead of direct charge transfer between the corresponding electrodes, the ions and electrons generated by the discharge adhere to the surface of the dielectric layer to form a wall. It is possible to form a wall voltage and to maintain discharge by a sustaining voltage.

On the other hand, in the opposite discharge type plasma display panel, an address electrode and a scan electrode are provided to face each unit 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 a common and scan electrode corresponding to each unit pixel are provided to generate addressing discharge and sustain discharge.

As shown in FIG. 1, the conventional plasma display panel 10 includes a front substrate 11 and a rear substrate 12 disposed to face the front substrate 11.

A plurality of common and scan electrodes 13 and 14 having a stripe shape are alternately formed on a lower surface of the front substrate 11, and electrodes are formed along one lower edge of the common and scan electrodes 13 and 14. In order to reduce the line resistance of the (13) and (14), a bus electrode 15 made of a metal material formed by making the width narrower than the electrodes 13 and 14 is formed.

The first dielectric layer 16 is applied to the bottom surface of the front substrate 11 to fill the electrodes 13 and 14 and the bus electrode 15, and the bottom surface of the first dielectric layer 16 is disposed thereon. In order to protect, a protective film layer 17 made of magnesium oxide (MgO) is formed.

On the other hand, an address electrode 18 having a shape perpendicular to the common and scan electrodes 13 and 14 is formed on an upper surface of the rear substrate 12 provided to face the front substrate 11. The address electrode 18 is buried by the second dielectric layer 19.

The partition wall 100 is formed on the upper surface of the second dielectric layer 19 to be spaced apart from each other by a predetermined interval. The discharge space partitioned by the partition wall 100 is filled with a gas containing xenon (Xe) as a main component. The phosphor layer 110 of red, green, and blue is coated inside the partition wall 100.

In the conventional plasma display panel 10 having the above structure, when voltage is applied between the scan electrode 14 and the address electrode 18, preliminary discharge occurs to charge the wall charge. In this state, when a voltage is applied between the common and scan electrodes 13 and 14, sustain discharge occurs to generate plasma. From this, ultraviolet rays are radiated to excite the phosphor layer 110 to implement a desired image.

In this case, the plasma display panel 10 may generate a color bleeding phenomenon due to a weak light emission phenomenon in a region other than the display region A that implements an image when a predetermined voltage is applied.

That is, the display area A is an area corresponding to the edges of the front and rear substrates 11 and 12, and the common and scan electrodes 13 and 14 and the address electrode 18 cross each other to form an image. In the non-discharge area B, which is formed adjacent to () and does not form an image, light emission is caused by background ground discharge, thereby degrading display quality and contrast. Therefore, it can be said that a separate means for blocking the light emission in the non-discharge area (B) is required.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a plasma display panel having an improved structure such that light emission does not occur in a non-discharge area other than the display area in which an image is formed.

1 is a partially cut away cross-sectional view showing a conventional plasma display panel;

2 is a partially cut away perspective view of a plasma display panel according to an embodiment of the present invention;

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

11,21 ... front substrate 12,22 ... back substrate

13,23 ... common electrode 14,24 ... scan electrode

15,25 ... bus electrode 16,26 ... first dielectric layer

17,27 ... Protective layer 18,28 ... Address electrode

19,29 ... Secondary dielectric layer 100,200 ... Bulk

110,210 ... phosphor layer 220 ... black mattress layer

In order to achieve the above object, the plasma display panel according to an aspect of the present invention,

A common and scan electrode alternately formed in a stripe shape on one surface, a bus electrode formed along one side edge of the bottom surface of the common and scan electrode, a first dielectric layer filling the electrodes, and a bottom surface of the first dielectric layer A front substrate having a protective film layer;

It is installed to face the front substrate,

An address electrode formed in a stripe shape so as to be orthogonal to the common and scan electrodes, a second dielectric layer filling the address electrode, a partition wall disposed between the second dielectric layer and partitioning a discharge space, and the partition wall A plasma display panel comprising: a rear substrate having red, green, and blue phosphor layers applied inwardly.

The black mattress layer may be formed in the non-discharge area corresponding to the outside of the display area where the common and scan electrodes and the address electrode cross each other to form an image.

In addition, the black mattress layer is formed at both ends of the common and scan electrodes orthogonal to these electrodes and formed in a direction parallel to the address electrodes.

In addition, the black mattress layer may be formed at both ends of the common and scan electrodes respectively corresponding to the outside of the left and right addresses on the outermost side of the address electrodes.

In addition, the black mattress layer is made of glass powder and an insulating material containing black pigment as a main component to prevent color bleeding caused by weak light emission in the non-discharge region.

In addition, the black mattress layer is characterized in that the conductive material made of a material mixed with silver powder and oxide so as to shield the electromagnetic waves generated from the panel.

Hereinafter, a plasma display panel according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 illustrates a plasma display panel 20 according to an embodiment of the present invention.

Referring to the drawing, the plasma display panel 20 is provided with a front substrate 21. On the lower surface of the front substrate 21, a plurality of pairs of discharge cells composed of a stripe-shaped common electrode 23 and a scan electrode 24 are alternately formed.

On the lower surface of the common and scan electrodes 23 and 24, stripe-shaped bus electrodes 25 are formed along the edge of one side in parallel with the electrodes 23 and 24 to reduce their line resistance. have. The bus electrode 25 is preferably made of a conductive material having a narrower width than the electrodes 23 and 24.

The first dielectric layer 26 is coated on the bottom surface of the front substrate 21 to fill the common and scan electrodes 23 and 24 and the bus electrode 25. On the lower surface of the first dielectric layer 26, a protective film layer 27 made of magnesium oxide is formed.

On the other hand, the panel 20 is provided with a rear substrate 22 to face the front substrate 21. On the upper surface of the rear substrate 22, an address electrode 28 having a shape orthogonal to the common and scan electrodes 23 and 24 is formed. The address electrode 28 is buried by the second dielectric layer 29.

The barrier rib 200 is formed on the upper surface of the second dielectric layer 29 to be spaced apart from each other in a direction parallel to the address electrode 28 to limit the discharge space and prevent crosstalk. A gas containing xenon as a main component is injected into the discharge space formed by the partition wall 200. In addition, red, green, and blue phosphor layers 210 are coated inside the partition wall 200.

Here, the non-discharge area D which is an area other than the display area C for forming an image when a predetermined voltage is applied to the common and scan electrodes 23 and 24 and the address electrode 28 provided to intersect with the common and scan electrodes 23 and 24. The black mattress layer 220 is formed in order to block the phenomenon in which light emission occurs.

That is, a plurality of common and scan electrodes 23 and 24 are alternately formed on the front substrate 21. Both ends of the common and scan electrodes 23 and 24, that is, the first address electrode 28a and the second address electrode 28b which are formed on the outermost side of the address electrode 28 on the left and right sides of the common and scan electrodes 23 and 24. The black mattress layer 220 is formed in the non-discharge area D corresponding to the outside to block the discharge due to the background when the display area C emits light.

The black mattress layer 220 is formed in a stripe shape with one line in a direction parallel to the address electrode 28. In addition, the black mattress layer 220 may be formed of an insulating material or a conductive material.

That is, when formed with an insulating material, color bleeding due to weak light emission in the non-discharge region D can be eliminated. Such an insulation material is formed of a glass powder, a lead oxide (PbO), aluminum oxide (Al ₂ O ₃ ), a black pigment, or the like.

On the other hand, when the conductive material is formed, electromagnetic waves generated from the plasma display panel 20 may be shielded. As the conductive material, a material in which silver powder and oxide are mixed is used.

The manufacturing method of the plasma display panel 20 according to the present invention having the above structure will be briefly described as follows.

The panel 20 forms predetermined functional layers on the front substrate 21 and the rear substrate 22, respectively.

That is, the front substrate 21 is provided, and a plurality of common and scan electrodes 23 and 24 made of a transparent conductive film, for example, ITO, are alternately formed in a stripe shape on the bottom surface of the front substrate.

A bus electrode 25 is formed at one side edge of the bottom surface of the common and scan electrodes 23 and 24 to reduce the line resistance of the electrodes 23 and 24.

Next, black mattress layers 220 formed of one line are formed at both ends of the common and scan electrodes 23 and 24 in a direction crossing the electrodes 23 and 24. Here, the black mattress layer 220 is in the direction parallel to the address electrode 28 to be described later, the outside of the first and second address electrodes 28a, 28b which are the left and right outermost electrodes of the address electrode 28. To form.

In this case, although the black mattress layer 220 is not mentioned in the present embodiment, the black mattress is formed in the non-discharge area between the pair of cells made up of the common and scan electrodes 23 and 24 and the neighboring cells. Forming at the same time as the layer will be advantageous to the manufacturing process.

These black mattress layers can be formed by printing or photolithography. In addition, the black mattress layer 220 is formed by selecting any one of an insulating material or a conductive material according to the function used for the panel 20 as described above.

Next, a first dielectric layer 26 is coated so that the common and scan electrodes 23 and 24, the bus electrode 25, and the black mattress layer 220 can be embedded, and the first dielectric layer 26 is provided. The lower surface of the dielectric layer 26 is protected and a protective film layer 27 made of magnesium oxide is formed to emit electrons.

On the other hand, a plurality of address electrodes 28 are formed in a stripe shape on the upper surface of the rear substrate 22 opposite to the front substrate 21 in a direction crossing the common and scan electrodes 23 and 24.

Subsequently, a second dielectric layer 29 is formed on the address electrode 28 to bury the electrode 28. After the second dielectric layer 29 is formed, the barrier rib 200 partitioning the discharge space in a direction parallel to the address electrode 29 is formed. In addition, the phosphor layer 210 of red, green, and blue is coated on the inside of the partition wall 200 corresponding to the address electrode 28.

As described above, after the functional layers are formed on the front and rear substrates 21 and 22, the substrates 21 and 22 are aligned and then sealed. In this case, glass frit may be used as a material to be bonded to maintain the airtightness of the substrates 21 and 22.

Next, the panel 20 evacuates the inside of the panel 20 in a heated state at a predetermined temperature to remove impurities including moisture adsorbed on the wall surface. After the high vacuum is obtained, the barium or zirconium getter is heated and activated by a high frequency induction heating method. These getters adsorb gas other than the desired gas.

Subsequently, a gas containing xenon as a main component is enclosed in the panel 20 and separated from the exhaust device. The panel 20 is completed by applying a predetermined voltage to the panel 20 to perform aging discharge and then cutting the getter.

When a voltage is applied between the scan electrode 24 and the address electrode 28, the plasma display panel 20 is charged with wall charges. In this state, when a voltage is applied between the common electrode 23 and the scan electrode 24, a sustain discharge occurs to generate a plasma, and ultraviolet rays are radiated therefrom to excite the phosphor layer 210 to implement an image.

In this case, a weak light emission phenomenon occurs in the non-discharge area D located outside the display area C in which the image is implemented. The plurality of black mattress layers 220 eliminates color bleeding due to the light emission phenomenon, lowers external light reflectance of the front substrate 21, and blocks light emission due to background discharge.

As described above, the plasma display panel of the present invention forms black mattress layers at both ends of the common and scan electrodes in parallel with the address electrodes, thereby preventing light emission from the non-discharged regions other than the display region. The contrast is improved.

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 (5)

A common and scan electrode alternately formed in a stripe shape on one surface, a bus electrode formed along one side edge of the bottom surface of the common and scan electrode, a first dielectric layer filling the electrodes, and a bottom surface of the first dielectric layer A front substrate having a protective film layer; It is installed to face the front substrate, An address electrode formed in a stripe shape so as to be orthogonal to the common and scan electrodes, a second dielectric layer filling the address electrode, a partition wall disposed between the second dielectric layer and partitioning a discharge space, and the partition wall A plasma display panel comprising: a rear substrate having red, green, and blue phosphor layers applied inwardly. And a black mattress layer formed on a non-discharge area corresponding to the outside of the display area where the common and scan electrodes and the address electrode cross each other to form an image. The method of claim 1, And the black mattress layer is formed at both ends of the common and scan electrodes in a direction perpendicular to the electrodes and parallel to the address electrodes. The method of claim 2, And the black mattress layers are formed at both ends of the common and scan electrodes respectively corresponding to the outside of the left and right addresses on the outermost side of the address electrodes. The method of claim 2, And the black mattress layer is made of glass powder and an insulating material containing black pigment as a main component to prevent color bleeding caused by weak light emission in the non-discharge region. The method of claim 2, The black mattress layer is a plasma display panel, characterized in that the conductive material made of a mixture of silver powder and oxide to shield the electromagnetic waves generated from the panel.