KR20020011755A - Plasma display panel - Google Patents

Abstract

PURPOSE: A plasma display device is provided to prevent change of color of a bus electrode due to diffused material and deterioration of white balance characteristic. CONSTITUTION: A plasma display device comprises a substrate(31), address electrodes(32), a first dielectric layer(33), a transparent front substrate(41), black matrix layers(42) and sustain electrodes(43,44). The address electrodes(32) is formed on the substrate(31). The black matrix layers(42) are stripes spaced on the surface of the front substrate(41) along a direction orthogonal to the address electrodes(32). The sustain electrodes(43,44) are formed over the black matrix layers(42) and the surface of the front substrate(41) between the black matrix layers(42). The sustain electrodes(43,44) include bus electrodes(43a,44a) and transparent electrodes(43b,44b). The bus electrodes(43a,44a) are formed along the surface edges of the black matrix layers(42) lengthwise. The transparent electrodes(43b,44b) are extended from the surface of the bus electrodes(43a,44a) to the surface of the front substrate(41) between the black matrix layers(42).

Description

Plasma display panel {Plasma display panel}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display device, and more particularly, to a black matrix layer formed on a front plate to prevent color blurring in external light reflection and non-discharge regions.

Plasma display devices are regarded as flat panel display panels that exhibit excellent display performance, such as display capacitance, brightness, contrast, and viewing angle, and are close to the performance of cathode ray tubes.

The plasma display device may be classified into a direct current plasma display device and an alternating current plasma display device according to its operation principle, and may be classified into a counter discharge type and a surface discharge type according to the configuration of the electrodes.

1 shows an example of a three-electrode surface discharge plasma display device of such a discharge type plasma display device.

As shown, the plasma display device 10 includes a substrate 11, an address electrode 12 formed on the substrate 11, a dielectric layer 13 formed on the substrate 11 on which the address electrode 12 is formed, And a partition wall 14 formed on the dielectric layer 13 to maintain a discharge distance and to prevent electro-optical crosstalk between cells, and a substrate 11 on which the partition wall 14 is formed, and the address electrode 12. The plurality of pairs of sustain electrodes 15 and 16 are provided with a front plate 17 formed on a lower surface thereof so as to be orthogonal thereto. Each of the sustain electrodes 15 and 16 has transparent electrodes 15a and 16a made of a transparent conductive material on a substrate, and are formed in a stripe shape, and a conductive metal such as Ag is formed at the edges of the transparent electrodes 15a and 16a. Bus electrodes 15b and 16b are formed. A black matrix layer 18 is formed between the sustain electrodes 15 and 16, and the black matrix layer 18 is formed in a simple stripe or as shown in FIG. 2. It is formed extending from the surfaces of the bus electrodes 15b and 16b formed on the 16a to the front plate surface between the dielectric electrodes 15 and 16. The dielectric layer 19 and the passivation layer 21 are stacked on the front plate 17 on which the sustain electrodes 15 and 16 and the matrix 18 are provided. In addition, red, green, and blue phosphor layers R (G) and (B) are formed in the discharge spaces partitioned by the partitions 13, and Ne, Xe, etc. are formed in the discharge spaces partitioned by the partitions 14. This mixed discharge gas is injected.

In the plasma display device having such a configuration, driving is largely divided into driving for address discharge and driving for sustain discharge. An address discharge occurs between the address electrode 12 and one sustain electrode 15, where wall charges are formed. The sustain discharge is caused by the potential difference between the sustain electrodes 15 and 16 located in the discharge space in which the wall charges are formed. This sustain discharge is a discharge for displaying an actual image and becomes a discharging state. In other words, the selected phosphor layers (R) (G) (B) are excited to the mother beam generated by the selective sustain discharge to form an image.

However, in the plasma display device, since the bus electrodes 15b and 16b are formed at the edges of the transparent electrode, sodium (Na) flowing out of the front plate 17 is diffused to discolor the bus electrodes 15b and 16b. The problem is inherent.

As described above, the discoloration of the bus electrodes 15b and 16b is exposed from the screen surface, which is not aesthetically pleasing, and deteriorates the white balance characteristic forming the color image.

Disclosure of Invention The present invention is to solve the above problems, and it is possible to fundamentally solve the discoloration of the bus electrode by the material diffused from the substrate, and to provide a plasma display device which can prevent the deterioration of the white balance characteristic due to the discoloration. The purpose is.

1 is an exploded perspective view of a partial ablation of a conventional plasma display device;

2 is a perspective view showing another embodiment of the conventional black matrix layer,

3 is an exploded perspective view of a plasma display device according to the present invention;

4 is a partial ablation perspective view illustrating an front plate of the plasma display device;

In order to achieve the above object, the plasma display device of the present invention,

A transparent front plate, a black matrix layer formed in a stripe shape spaced at predetermined intervals on an inner surface of the front plate, a bus electrode formed in a longitudinal direction along a surface edge of the black matrix layer, and from the surface of the bus electrode Sustain electrodes having a width extending to the surface of the substrate and made of a transparent electrode extending in the longitudinal direction,

And a substrate formed on the top surface of the sustain electrode to form a discharge space and the address electrode at a predetermined angle with the sustain electrode.

In the present invention, the black matrix layer is made of chromium oxide, the width of the black matrix extending to the lower surface of the transparent electrode is preferably formed to less than 100㎛.

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

3 shows an embodiment of a plasma display device according to the present invention.

As shown, the plasma display device 30 according to the present invention includes a substrate 31, address electrodes 32 formed in a predetermined pattern on the upper surface of the substrate 31, and formed on the substrate 31. As shown in FIG. And a first dielectric layer 33 filling the address electrode 32. The address electrodes 32 have a predetermined width and are formed in parallel stripes. A partition wall 34 is formed on the first dielectric layer 33 between the address electrodes 32 to partition the discharge space in a direction parallel to the address electrode 32. Red, blue, and green phosphor layers R (G) and (B) are formed in the region between the partition walls 34.

The substrate 31 is coupled to the transparent front plate 41 to seal the space. The surface of the front plate 41 has a black matrix layer having a predetermined width in a direction orthogonal to the address electrodes 32. 42 is formed. Here, the space between the black matrix layers 42 should be able to secure a space in which the sustain electrode to be described later can be formed.

The sustain electrodes 43 and 44 are formed on the upper surfaces of the black matrix layers 42 formed as described above and the surface of the front plate 41 therebetween. The sustain electrodes 43 and 44 each have a predetermined width W1 at both edges of the black matrix layer 42 and are formed in the longitudinal direction thereof, and the bus electrodes 43a and 44a are formed in the longitudinal direction. 43a, 44a, and transparent electrodes 43b, 44b having a width W2 extending from the surface of the front plate 42 between the black matrix layers 42. As shown in FIG. Here, a part of the edge of the black matrix layer 42 is located on the lower surface of the transparent electrodes 43b and 44b, and the width W3 is preferably 100 μm or less. The black matrix layer 42 is preferably formed of chromium oxide, and the bus electrodes 43a and 44a are used to reduce the line resistance of the transparent electrode in order to reduce the line resistance. Is done.

As described above, the second dielectric layer 45 and the passivation layer (MgO) in which the sustain electrodes 42 and the black matrix layer 43 are embedded are disposed on the front substrate on which the black matrix layer 42 and the sustain electrodes 43 and 44 are formed. Consisting of) is formed sequentially.

Referring to the operation of the plasma display device according to the present invention configured as described above are as follows.

First, when a predetermined pulse voltage is applied to one of the address electrodes 32 and the sustain electrodes 43 and 44, an address discharge occurs between them to form wall charges on the inner surface of the discharge space. The wall charge generated at this time is charged on the surface of the discharge space. In this state, when a voltage is applied between the sustain electrodes 43 and 44, a sustain discharge occurs between them to generate a mother beam. The mother beam generated by the selected sustain discharge is excited by the phosphor layer applied to the discharge space to emit light.

As described above, in the image formed by the emission of the phosphor layer, the bus electrodes 43a and 44a are covered by the black matrix layer 42, thereby improving color blurring in the non-emission area. That is, since the components exposed to the outside from the screen surface are the transparent electrodes 43b and 44b and the black matrix layers 42, contrast between pixels may be improved. In addition, even when the bus electrodes 43b and 44b are yellowed by sodium diffused from the substrate, the bus electrodes 43b and 44b are covered by the black matrix, thereby preventing external light reflection and lowering the light absorption by the black matrix. have.

As described above, in the plasma display device according to the present invention, the bus electrode may be formed on the upper surface of the black matrix layer to fundamentally solve the problem caused by the discoloration of the bus electrode.

The 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 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 (3)

Transparent front panel; A black matrix layer formed on the inner surface of the front plate and formed in a stripe spaced apart at predetermined intervals; And a sustain electrode formed of a bus electrode formed in a longitudinal direction along a surface edge of the black matrix layer, and a transparent electrode extending from a surface of the bus electrode to a surface of a substrate and having a predetermined width and extending in a length direction. And a substrate forming a discharge space with the sustain electrodes and having an address electrode formed on an upper surface thereof at a predetermined angle with the sustain electrodes. The method of claim 1, And the black matrix layer is formed of chromium oxide. The method according to claim 1 or 2, And a lengthwise edge of the black matrix layer is introduced into a lower surface of the transparent electrode by a predetermined width.