KR100592250B1 - Plasma display panel with improved structure of bus electrode - Google Patents

Abstract

An object of the present invention is to provide a plasma display panel having a structure in which the common bus electrode is prevented from being broken by the process of forming the bus electrode. To achieve this object, the present invention provides a rear substrate and a rear substrate. A plurality of address electrodes formed in a predetermined pattern on one side, a rear dielectric layer filling the address electrode, a partition wall formed on an upper side of the rear dielectric layer to partition a discharge cell, a phosphor coated in the discharge cell, a rear substrate, A front substrate disposed to face each other, a plurality of image part common bus electrodes formed in a predetermined pattern for each discharge cell at the lower side of the front substrate, and a terminal part common bus electrode connected integrally with all of the image part common bus electrodes The width of the common bus electrode of the image part is larger than that of the other part where the edge where it meets the common bus electrode of the terminal part A common bus electrode formed to be larger, a plurality of scan bus electrodes formed in pairs with the common bus electrode for each discharge cell to generate a sustain discharge, and a front dielectric layer filling the common bus electrode and the scan bus electrode; Provided is a plasma display panel.

Description

Plasma display panel with improved structure of bus electrode}

1 is a perspective view schematically showing a conventional plasma display panel according to the related art;

FIG. 2 is a plan view illustrating a structure of a common bus electrode formed under the front substrate of FIG. 1;

3 is a perspective view showing a plasma display panel according to a preferred embodiment of the present invention;

4 is a plan view illustrating a structure of a common bus electrode formed under the front substrate of FIG. 3;

5 is an enlarged cross-sectional view of part A of FIG. 4;

6 is a cross-sectional view illustrating a modification of FIG. 5.

Explanation of symbols on the main parts of the drawings

100: plasma display panel 122: front substrate

123: X electrode 124: Y electrode

126: front dielectric layer 127: protective layer

143: common transparent electrode 144: scanning transparent electrode

153: common bus electrode 153a: image portion common bus electrode

153a ': Common bus electrode edge of image part 153b: Common bus electrode of terminal part

B: Front 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 a bus electrode having an improved structure to prevent a defect of a bus electrode.

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.

The plasma display panel may be classified into a direct current type and an alternating current type according to a discharge type. In the DC plasma display panel, the electrodes are exposed to the discharge space so that the movement of charged particles is directly performed between the corresponding electrodes. In the AC plasma display panel, at least one electrode is covered with a dielectric layer, so that the direct charges of the corresponding electrodes are mutually reduced. The discharge is performed by the electric field of the wall charge instead of the movement of.

1 shows a typical AC plasma display panel. Referring to FIG. 1, a conventional plasma display panel 10 includes a front substrate 22 and a rear substrate 32 disposed to face the front substrate.

The front substrate 22 is usually a glass substrate, on which a common transparent electrode 43 and a scanning transparent electrode 44 are arranged in pairs. The common transparent electrode 43 and the scanning transparent electrode 44 are commonly referred to as transparent electrodes made of indium tin oxide (ITO). In order to reduce the line resistance, the common bus electrode 53 and the scan common electrode 54 each having a narrow width are disposed on the lower surfaces of the transparent electrodes 43 and 44, respectively.

The common bus electrode 53 and the scan common electrode 54 may be made of an Ag material. In this case, as described in US Pat. No. 6276980, the process of forming the bus electrode is usually performed by printing an Ag paste. Has a thickness of 5 μm, a step of exposing and developing the Ag paste to pattern a bus electrode, and a step of firing the patterned bus electrode to complete a bus electrode. In addition to Ag, the bus electrodes may be made of another material such as, for example, Cr-Cu-Cr. In this case, the bus electrode forming process includes a firing process.

Since the sustain discharge is generated by the X electrode 23 composed of the common transparent electrode 43 and the common bus electrode 53, and the Y electrode 24 composed of the scan transparent electrode 44 and the scan bus electrode 54. The X electrode 23 and the Y electrode 24 form one sustaining electrode pair.

On the upper surface of the rear substrate 32 disposed to face the front substrate 22, an address electrode 34 is disposed to intersect with the pair of sustain electrodes of the front substrate 22.

The front dielectric layer 26 is embedded in the lower surface B of the front substrate including the plurality of X electrodes 23 and the Y electrodes 24 and the upper surface of the rear substrate provided with the address electrode 34. And a backside dielectric layer 36 is formed.

A protective layer 27 made of MgO is formed on the lower surface of the front dielectric layer 26, and a discharge distance is maintained on the upper surface of the rear dielectric layer 36, the discharge cells are divided, and electrical and optical crosstalk between the discharge cells is maintained. A partition 38 is formed to prevent talk. Red, green, and blue phosphors 39 are coated on both side surfaces of the barrier rib 38 and the upper surface of the rear dielectric layer 36 on which the barrier rib 38 is not formed.

The operation of the plasma display panel having such a structure is as follows. When a predetermined voltage is applied to the address electrode 34 and the Y electrode 24, a discharge cell for emitting light is selected, and an address discharge occurs between two electrodes in the selected discharge cell, so that the wall charges on the front dielectric layer 26. Is charged. After that, when a predetermined voltage is applied between the X electrode 23 and the Y electrode 24, the wall charge is moved between the X and Y electrodes 23 and 24, and a sustain discharge is generated through the discharge gas. As a result, the discharge gas generates ultraviolet rays, and the generated ultraviolet rays excite the phosphor 39 to form an image.

In this case, the voltage applied to the X electrode is applied through the common bus electrodes in the circuit section, and all of the common bus electrodes adopted in the plasma display panel are the same at the same time in the reset period, the address period, the sustain period, and the erase period. Voltage is applied.

Referring to Figure 2, the structure of the common bus electrode 53 will be described in detail. Here, FIG. 2 illustrates a state in which the front substrate 22 is inverted so that the bottom surface B is shown on the upper side for convenience of description.

As shown in FIG. 2, the front substrate 22 may be divided into an image area I capable of displaying an image and a non-image area O capable of displaying an image. In the image area (I), a plurality of image part common bus electrodes 53a, which are usually formed in each discharge cell, are formed in a plurality of constant patterns.

All of the image part common bus electrodes 53a are connected to one side of one terminal part common bus electrode 53b in the non-image area O so as to be conductive. Here, the portion where the terminal part common bus electrode of the image part common bus electrode meets has the same width d as the image part common bus electrode in the image area.

Here, a portion where the terminal part common bus electrode 53b and the image part common bus electrode 53a meet is an edge that is easily damaged by shear stress as compared to other parts.

As described above, in the process of forming the common bus electrode 53, the bus electrode 53 is subjected to a heat treatment at a high temperature to be fired. However, the common bus electrode 53 shrinks due to the high temperature heat during the firing process.

Particularly, the edge portion 53a 'where the image portion common bus electrode 53a, which is an edge, of the common bus electrode 53 meets the terminal portion common bus electrode 53b is easily deformed by the firing process. Since the electrode is disconnected without being connected to the common bus electrode of the terminal part, there is a problem that an incorrect discharge occurs inside the discharge cell, thereby increasing the defective rate of the plasma display panel.

The present invention is to solve the various problems including the above problems, and to provide a plasma display panel having a structure that is not broken at the corner portion where the common bus electrode and the common bus electrode of the terminal portion of the common bus electrodes meet. For the purpose of

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

A rear substrate;

A plurality of address electrodes formed in a predetermined pattern on one side of the rear substrate;

A backside dielectric layer filling the address electrodes;

Barrier ribs formed on the rear dielectric layer to partition discharge cells;

A phosphor coated in the discharge cell;

A front substrate disposed to face the rear substrate;

Under the front substrate, a plurality of image part common bus electrodes formed in a predetermined pattern for each discharge cell and a terminal part common bus electrode connected integrally with all of the image part common bus electrodes are provided. A common bus electrode having a width at which a corner portion of the common bus electrode meeting the common bus electrode is larger than another portion;

A plurality of scan bus electrodes formed in pairs with the common bus electrode for each discharge cell to generate a sustain discharge; And

It provides a plasma display panel comprising a front dielectric layer to bury the common bus electrode and the scan bus electrode.

The edge portion of the image part common bus electrode which meets the terminal part common bus electrode may have a shape in which the width thereof is gradually increased as the terminal part common bus electrode approaches.

In this case, it is preferable that the corner portion of the image part common bus electrode that meets the terminal part common bus electrode has a rounded shape.

Alternatively, the edge portion of the image common bus electrode which meets the terminal common bus electrode may have an inclined surface shape inclined so that its width increases as the terminal common bus electrode approaches.

Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Here, the same reference numerals as in the drawing shown in FIG. 1 indicate the same components with the same structure and function.

Referring to FIG. 3, the plasma display panel 100 according to an exemplary embodiment of the present invention includes a rear substrate 32 and a front substrate 122 disposed to face the rear substrate 32.

The front substrate 122 is usually a glass substrate. The lower surface B of the front substrate 122 alternates with the Y electrode 124 for generating an address discharge together with the address electrode 34 and the Y electrode 124. A furnace voltage is applied to generate the X discharge 123 in pairs.

In the drawing, the X electrode 123 is composed of a common transparent electrode 143 and a common bus electrode 153 formed on the bottom surface of the common transparent electrode 143 to compensate for the line resistance of the common transparent electrode. Reference numeral 124 includes a scan transparent electrode 144 and a scan bus electrode 154 formed on the lower surface of the scan transparent electrode 144 to compensate for the line resistance of the scan transparent electrode, but is not limited thereto. In the present invention, the common transparent electrode 143 and the scan transparent electrode 144 may not be formed.

In addition, an XYXY type in which the X and Y electrodes 123 and 124 are arranged in sequence for each adjacent discharge cell is illustrated, but the present invention is not limited thereto. XYYX type is also possible.

A front dielectric layer 126 is formed on the bottom surface B of the front substrate 122 to fill the X and Y electrodes 123 and 124. A protective layer 127 may be formed on the lower surface of the front dielectric layer 126.

Address electrodes 34 intersecting the X and Y electrodes 123 and 124 are formed on one side of the rear substrate 32 disposed to face the front substrate 122, and the address electrodes 34 are formed of a rear dielectric layer ( 36) is covered. The address electrode 34 forms one discharge cell together with the X and Y electrodes 123 and 124. A partition wall 38 is formed on the rear dielectric layer 36, and the discharge cell is partitioned by the partition wall 38. The phosphor 39 is coated on the inner surface of the discharge cell.

Here, the common bus electrode 153 is connected to all of the image part common bus electrode 153a and the image part common bus electrode 153a formed on the lower side of the front substrate so that all of the image part common bus electrodes 153a are formed. And a common bus electrode 153b connected to the terminal portion. The opposite side of the common bus electrode 153b connected to the image bus common electrode 153a is connected to a circuit unit.

The width of the image part common bus electrode 153a is larger than that of the other part where the edge part 153a 'which meets the terminal part common bus electrode is larger.

Hereinafter, the structure of the common bus electrode 153 will be described in detail with reference to FIGS. 4 to 6. 4 is a front substrate upside down for convenience of explanation, the bottom surface (B) is shown on the upper side. As shown in FIG. 4, the common bus electrode 153 is composed of the image part common bus electrode 153a and the terminal part common bus electrode 153b, and the front substrate 122 is an area where an image can be displayed. The image area I may be divided into a non-image area O, which is an area where an image cannot be displayed. The image unit common bus electrode 153a is disposed over the image region I and has a plurality of patterns. The terminal unit common bus electrode 153b is formed in the non-image area O. FIG. All of the image part common bus electrodes 153a are connected to one side of the terminal part common bus electrode 153b and are electrically connected to the terminal part common bus electrode 153b.

In the image common bus electrode, the width d of the image area and the width D of the corner portion 153a 'which meet the terminal common bus electrode are different.

In particular, it is preferable that the width D of the corner portion 153a 'is larger than the width d of the other portion, which is a bus that is generated during the firing process during the formation of the common bus electrode 153. This is to prevent the edge portion where the common part bus electrode and the common part electrode of the image part meet due to shrinkage of the electrode is broken. As a result, the width of the edge part 153a, which is an edge part, is increased to increase the strength, thereby increasing the strength. The bus electrode 153a and the terminal part common bus electrode 153b are not disconnected.

In order for the edge portion 153a 'that meets the terminal portion common bus electrode 153b of the image portion common bus electrode 153a as an edge to have a high strength, in particular, the width of the edge portion of the image portion common bus electrode may be a terminal portion. It is preferable that the shape becomes larger as one approaches the common bus electrode.

For this purpose, as shown in FIG. 5, the corner portion 153a ′ that meets the terminal portion common bus electrode 153b of the image portion common bus electrode 153a may have a rounded shape.

Unlike the rounded shape, as shown in FIG. 6, the edge portion 153a ′ that meets the terminal part common bus electrode 153b of the image part common bus electrode 153a becomes larger as it approaches the terminal part common bus electrode. It may have an inclined surface shape inclined so as to.

The present invention is not limited to the corner portion 153a 'having a rounding shape or an inclined surface shape, and the corner portion 153a' is a shape in which the width of the image common bus electrode becomes larger as the terminal common bus electrode approaches the common bus electrode. Can be adopted as the invention.

According to the present invention having the above-described configuration, the corner portion of the image part common bus electrode which meets the terminal part common bus electrode due to shrinkage in the firing process is prevented from being broken.

As a result, the false discharge due to the bus electrode is prevented, thereby reducing the defective rate of the entire plasma display panel.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and any person skilled in the art to which the present invention pertains may have various modifications and equivalent other embodiments. Will understand. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (4)

Back substrate; A plurality of address electrodes formed in a predetermined pattern on one side of the rear substrate; A backside dielectric layer filling the address electrode; Barrier ribs formed on the rear dielectric layer to partition discharge cells; A phosphor coated in the discharge cell; A front substrate disposed to face the rear substrate; A plurality of image part common bus electrodes formed in a predetermined pattern for each discharge cell and a terminal part common bus electrode connected vertically integrally with all of the image part common bus electrodes under the front substrate; A width of the common bus electrode of the image part is formed such that a corner portion of the image bus common bus electrode is larger than the other part; A plurality of scan bus electrodes formed in pairs with the common bus electrode for each discharge cell to generate a sustain discharge; And And a front dielectric layer filling the common bus electrode and the scan bus electrode. The method of claim 1, And a corner portion of the image part common bus electrode that meets the terminal part common bus electrode becomes wider as the terminal part approaches the common bus electrode. The method of claim 2, And a corner portion of the image part common bus electrode that meets the terminal part common bus electrode has a rounded shape. The method of claim 2, And a corner portion of the image part common bus electrode which meets the terminal part common bus electrode has an inclined surface shape inclined so that its width increases as the terminal part accesses the common bus electrode.

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