KR100603314B1 - Plasma display pannel - Google Patents

Abstract

An object of the present invention is to provide a plasma display panel having reduced external light reflection luminance, and to achieve this object, a front substrate, a plurality of sustain electrode pairs formed under the front substrate, and under the sustain electrode pairs. Bus electrodes formed on the substrate, and a front dielectric layer formed below the front substrate such that the sustain electrode pairs and the bus electrodes are buried. The bus electrodes include a Cr ₂ O ₃ layer and a Cr ₂ O ₃ layer. A plasma display panel is provided, comprising a first Cr layer formed on the substrate, a conductive layer formed under the first Cr layer, and a second Cr layer formed under the conductive layer.

Description

Plasma display panel {Plasma display pannel}

1 is a partial cross-sectional view of a bus electrode formed on a top plate of a general plasma display panel.

2 is a cross-sectional view of a plasma display panel according to a first embodiment of the present invention;

3 is an enlarged view of portion A of FIG. 2,

4 is an exploded perspective view of a plasma display panel according to a second embodiment of the present invention;

5 is an enlarged view of a portion B of FIG. 4.

Explanation of symbols on the main parts of the drawings

100: plasma display panel 111: front substrate

112: sustain electrode pair 114: bus electrode

115: front dielectric layer 116: protective layer

121: back substrate 122: address electrode

125 back dielectric layer 126 phosphor layer

130: partition 140: external light reflection absorbing layer

181: First Cr Layer 182: Conductive Layer

183: Second Cr layer 184: Cr ₂ O ₃ layer

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel having reduced external light reflection luminance.

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 is a partial cross-sectional view of a bus electrode 14 formed on a top plate of a general plasma display panel. The bus electrode 14 is formed under the sustain electrode 12. The bus electrode 14 has a structure in which the first Cr layer 81, the conductive layer 82, and the second Cr layer 83 are successively stacked. Has The first Cr layer 81 and the second Cr layer 83 not only allow the conductive layer 14 to be stably formed on the bus electrode 14, but also protect the conductive layer 82. The conductive layer 14 is formed using copper or aluminum. The front dielectric layer 15 is formed under the bus electrode 14. However, since the components of the general bus electrode 14 are all metal, there is a problem of increasing external light reflection luminance of the plasma display panel by reflecting external light.

In order to solve the above problems, an object of the present invention is to provide a plasma display panel having a bus electrode or a sustain electrode on which a Cr ₂ O ₃ layer is formed.

In order to achieve the above and other objects, the present invention provides a front substrate, a plurality of sustain electrode pairs formed under the front substrate, and a front dielectric layer formed under the front substrate so that the sustain electrode pairs are embedded. The sustain electrode pairs include a Cr ₂ O ₃ layer, a first Cr layer formed under the Cr ₂ O ₃ layer, a conductive layer formed under the first Cr layer, and a bottom of the conductive layer. Provided is a plasma display panel comprising a second Cr layer formed on the substrate.

Further, according to another aspect of the present invention, a front substrate, a plurality of sustain electrode pairs formed under the front substrate, bus electrodes formed under the sustain electrode pairs, and the sustain electrode pairs and the bus electrode And a front dielectric layer formed below the front substrate so that the substrates are buried, and the bus electrodes include a Cr ₂ O ₃ layer and a first Cr layer formed below the Cr ₂ O ₃ layer and below the first Cr layer. A plasma display panel comprising a conductive layer formed and a second Cr layer formed under the conductive layer.

In this case, the sustain electrode pairs may be transparent electrodes.

In the present invention, preferably, in the plasma display panels, the conductive layer may be formed of aluminum (Al).

In the present invention, preferably, in the plasma display panels, the conductive layer may be formed of copper (Cu).

In the present invention, preferably, in the plasma display panels, the thickness of the Cr ₂ O ₃ layer may be 100 kPa to 500 kPa.

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

2 and 3, there is shown a plasma display panel 100 according to a first preferred embodiment of the present invention. 2 is a cross-sectional view of the plasma display panel 100, and FIG. 3 is an enlarged view of portion A of FIG.

As shown, the AC plasma display panel 100 according to the present invention includes an upper plate 150 showing an image to a user and a lower plate 160 coupled in parallel thereto. 2 illustrates a state in which the lower plate 160 is rotated 90 degrees for convenience of description. On the front substrate 111 of the upper plate 150, a sustain electrode pair 112, which is formed by pairing the X electrode 131 and the Y electrode 132, is disposed, and the sustain electrode pair 112 of the front substrate 111 is disposed. The address electrode 122 is disposed on the rear substrate 121 of the lower plate 160 opposite to the surface thereof so as to intersect the electrodes 131 and 132 of the front substrate 111. The sustain electrode pair 112 including the X and Y electrodes 131 and 132 of the front substrate 111 may preferably use a transparent electrode made of indium tin oxide (ITO). Under these transparent electrodes, a bus electrode 114 having a narrow width is disposed to reduce line resistance. The space formed by the pair of X and Y electrodes 131 and 132 and the address electrodes 122 intersecting with each other forms one discharge unit as a unit discharge cell. In order to increase contrast, an external light reflection absorbing layer 140 formed in parallel with the sustain electrode pair 112 is disposed in the non-discharge portion between the sustain electrode pairs 112.

Referring to FIG. 3, the bus electrode 114 has a structure in which a Cr ₂ O ₃ layer 184, a first Cr layer 181, a conductive layer 182, and a second Cr layer 183 are sequentially stacked. That is, unlike the conventional bus electrode 14, a Cr ₂ O ₃ layer 184 is further provided between the sustain electrode 112 and the first Cr layer 181. The Cr ₂ O ₃ layer 184 is a layer formed by oxidizing Cr and becomes dark due to oxidation. Therefore, when the external light is incident, rather than reflecting it, the external light reflection luminance of the plasma display panel 100 is reduced.

The bus electrode 114 may be formed using a sputtering method. First, by adjusting the concentration of argon and oxygen, a Cr ₂ O ₃ layer 184 is formed on the surface of the sustain electrode 112. If the thickness of the Cr ₂ O ₃ layer 184 is too thin, the external light is difficult to prevent the reflection, it is too thick surface increases the resistance of the bus electrode 114 by the Cr component, the thickness of the Cr ₂ O ₃ layer 184 It is preferable that it is 100 Hz-500 Hz. Then, the first Cr layer 181, the conductive layer 182, and the second Cr layer 183 are sequentially formed on the surface of the Cr ₂ O ₃ layer 184 using argon gas. The conductive layer 182 may be formed using various conductive materials, but is preferably formed using copper or aluminum having good electrical conductivity.

The front dielectric layer 115 and the front substrate 111 having the X and Y electrodes 131 and 132 and the back substrate 121 having the address electrode 122 are buried therein, respectively. Back dielectric layer 125 is formed. A protective layer 116, which is usually made of MgO, is formed on the front dielectric layer 115, and the barrier rib 130 maintains a discharge distance on the rear dielectric layer 125 and prevents electro-optic crosstalk between discharge cells. Is formed. Red, green, and blue phosphors 126 are coated on both side surfaces of the barrier rib 130 and the upper surface of the back dielectric layer 125 on which the barrier rib 130 is not formed.

The operation of the plasma display panel having this structure is as follows. When a predetermined voltage is applied to the address electrode 122 and the Y electrode 132, an address discharge occurs between the two electrodes, and wall charges are charged on the front dielectric layer 115 to select a discharge cell for emitting light. When a predetermined voltage is applied between the X electrode 131 and the Y electrode 132, wall charges move between the two electrodes 131 and 132, causing the discharge gas to cause a sustain discharge, thereby discharging. The gas generates ultraviolet rays, and the generated ultraviolet rays excite the phosphor 126 to form an image. In this case, the plasma display panel 100 implements a gray level required for displaying an image by adjusting the number of sustain discharges according to the video data, and in order to express such a gray level, one frame usually has a different number of discharge times. The ADS (Address and Display Period Separated) method of driving by dividing into several subfields is mainly used.

4 and 5 illustrate a plasma display panel 200 in a matrix form according to a second embodiment of the present invention. 4 is an exploded perspective view of the plasma display panel 200, and FIG. 5 is an enlarged view of a portion B of FIG. 4. The structure and function of the lower plate 260 including the back substrate 221, the address electrode 222, the back dielectric layer 225, the partition wall 230, and the phosphor layer 226 is the plasma display according to the first embodiment. Since it is similar to the bottom plate 160 of the panel 100, it is omitted here.

In the case of the upper plate 250, a pair of sustain electrodes 212 of the X electrodes 231 and the Y electrodes 232 are formed under the front substrate 211. The front dielectric layer 215 is formed under the front substrate 211 to cover the sustain electrode pair 212, and a protective layer 216 is formed below the front substrate 211. Unlike the plasma display panel 100 according to the first embodiment, the plasma display panel 200 has a structure in which no bus electrode is formed.

The sustain electrode 212 has a structure in which a Cr ₂ O ₃ layer 284, a first Cr layer 284, a conductive layer 284, and a second Cr layer 284 are successively stacked below the front substrate 211. Have The Cr ₂ O ₃ layer 284 is a layer formed by oxidizing Cr and becomes dark due to oxidation. Therefore, when external light is incident, it absorbs rather than reflects it, thereby reducing the external light reflection luminance. If the thickness of the Cr ₂ O ₃ layer 284 is too thin, it is difficult to prevent external light reflection. If the thickness of the Cr ₂ O ₃ layer 284 is too thick, the resistance of the bus electrode is increased by the Cr component. In addition, the conductive layer 282 may be formed using various conductive materials, but is preferably formed using copper or aluminum having good electrical conductivity.

Since the method of forming the sustain electrode 212 is similar to the method of forming the bus electrode 114 of the plasma display panel 100 according to the first embodiment, it is omitted here.

Like reference numerals in the drawings shown above indicate the same members.

In the plasma display panel according to the present invention, reflection of external light is suppressed because the bus electrode or sustain electrode includes a Cr ₂ O ₃ layer having a dark color. Therefore, the external light reflection luminance is lowered to increase the clear room contrast.

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 (6)

Front substrate; A plurality of sustain electrode pairs formed under the front substrate; And A front dielectric layer formed under the front substrate so that the sustain electrode pairs are embedded; The sustain electrode pairs, Cr ₂ O ₃ layer having a thickness of 100 kPa to 500 kPa, A first Cr layer formed under the Cr ₂ O ₃ layer, A conductive layer formed under the first Cr layer and formed of aluminum (Al); and And a second Cr layer formed under the conductive layer. Front substrate; A plurality of sustain electrode pairs formed under the front substrate; Bus electrodes formed under the sustain electrode pairs; And A front dielectric layer formed under the front substrate such that the sustain electrode pairs and the bus electrodes are buried; The bus electrodes, Cr ₂ O ₃ layer having a thickness of 100 kPa to 500 kPa, A first Cr layer formed under the Cr ₂ O ₃ layer, A conductive layer formed under the first Cr layer and formed of aluminum (Al); and And a second Cr layer formed under the conductive layer. delete delete delete The plasma display panel of claim 2, wherein the sustain electrode pairs are transparent electrodes.

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