KR100297689B1 - Plasma display panel - Google Patents

Abstract

A plasma display panel is disclosed. The panel includes an upper electrode having a transparent upper substrate, a plurality of common electrodes and a plurality of scan electrodes formed in a predetermined pattern on the upper substrate, and a transparent dielectric layer formed to fill the plurality of common electrodes and the plurality of scan electrodes. And a lower electrode assembly having a plurality of common electrodes and an address electrode corresponding to the plurality of scan electrodes, the lower electrode assembly being disposed below the upper electrode assembly to form a discharge space. Each of the scan electrodes is formed of a conductive metal having a thickness of 100 GPa or less. Such a plasma display panel has improved light transmittance as well as electrical conductivity compared to a conventional ITO electrode, so that the luminous efficiency can be increased and the brightness of the panel can be improved.

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 an plasma display panel in which an upper electrode formed in an upper electrode assembly is improved.

Plasma display panel is a desired number by encapsulating gas on two substrates coated with a plurality of electrodes and then applying a discharge voltage and exciting a phosphor formed in a predetermined pattern by ultraviolet rays generated by the discharge voltage. Refers to a device that obtains letters or graphics.

Such a plasma display panel is classified into a direct current type and an alternating current type according to a type of a driving voltage applied to a discharge cell, for example, a discharge type, and can be classified into a counter discharge type and a surface discharge type according to the configuration of the electrodes.

The direct current plasma display device is a structure in which all electrodes are exposed to a discharge space, and charge is directly transferred between corresponding electrodes. In an AC plasma display device, at least one electrode is surrounded by a dielectric layer, and discharge is performed by an electric field of wall charge instead of direct charge transfer between corresponding electrodes.

In the opposite discharge type plasma display panel, an address electrode and a scan electrode are provided to face each pixel, and an addressing discharge and a sustaining discharge are generated between the two electrodes. Meanwhile, in the surface discharge plasma display device, an address electrode, a common electrode, and a scan electrode corresponding to each unit pixel are provided to generate addressing discharge and sustain discharge.

In particular, in the AC plasma panel, the upper electrode formed on the front surface of the panel is generally used as an electrode of a transparent material in order to increase luminous efficiency, and a representative material thereof is indium tin oxide (ITO). Such a transparent electrode has to be reduced in thickness in order to improve light transmittance, but there is a limit because electrical conductivity is lowered so as to reduce the thickness.

A typical ITO transparent electrode has a thickness of 1000 mW, and at this thickness the light transmittance is approximately 85% -90%, but the electrical conductivity at this thickness is quite low. In the case of increasing the thickness in order to improve the electrical conductivity of the electrode, the light transmittance is remarkably lowered, which causes problems such as a decrease in luminance of the display panel or a decrease in luminous efficiency.

The present invention has been made to solve the above problems, and an object thereof is to provide a plasma display panel having an improved structure so that the electrical conductivity and the light transmittance of the transparent electrode are optimized.

1 is a perspective view of an embodiment of a plasma display panel according to the present invention.

2 is a cross-sectional view of the panel of FIG. 1.

<Explanation of symbols for the main parts of the drawings>

11 top electrode assembly 12 top substrate

13 ... common electrode 14 ... scan electrode

15 bus electrode 16 dielectric layer

17.shield 110 ... lower electrode assembly

The plasma display panel of the present invention for achieving the above object, a transparent upper substrate, a plurality of common electrodes and a plurality of scanning electrodes formed in a predetermined pattern on the upper substrate, the plurality of common electrodes and a plurality of An upper electrode assembly having a transparent dielectric layer formed to fill a scan electrode;

A plasma display panel comprising a lower electrode assembly having a plurality of common electrodes and an address electrode corresponding to a plurality of scan electrodes and disposed below the upper electrode assembly to form a discharge space.

The plurality of common electrodes and the plurality of scan electrodes are each formed of a conductive metal having a thickness of 100 m or less.

And the material of the conductive metal is preferably any one selected from the group consisting of silver, copper, aluminum and chromium.

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

1 and 2 illustrate an example of an AC type and a surface discharge type plasma display device 10 of the plasma display panel according to the present invention.

Referring to the drawings, the plasma display panel 10 includes an upper electrode assembly 11 and a lower electrode assembly 110. The upper electrode assembly 11 includes an upper substrate 12 made of transparent glass, a stripe-shaped common electrode 13 and a scan electrode 14 alternately formed on a lower surface of the upper substrate 12, and A bus electrode 15 formed on one side of the common electrode 13 and the scan electrode 14, and a transparent dielectric layer 16 formed to fill the electrodes 13, 14, and 15. And a protective film 17 of a thin film formed on the dielectric layer 16.

Meanwhile, the lower electrode assembly 110 is formed to fill the lower substrate 120 made of glass, the address electrode 130 formed in a stripe shape on the lower substrate 120, and the address electrode 130. Dielectric layer 140, a barrier rib 150 formed on the dielectric layer 140, and a phosphor layer 160 applied between the barrier ribs 150. The lower electrode assembly 110 having such a structure is oriented so that the address electrode 130 intersects the common electrode 13 and the scan electrode 14, and is coupled to the upper electrode assembly 11. The spaces between the partition walls 150 in the panel thus joined provide a discharge space.

In the plasma display panel 10 having the structure described above, a voltage is applied between the common electrode 13 and the address electrode 130 to generate a preliminary discharge to charge the wall charge. In the discharge space filled with the wall charges, a voltage is applied between the common electrode 13 and the scan electrode 14 to generate sustain discharge, thereby forming plasma. Ultraviolet rays are emitted from the plasma to excite the phosphor 160, and the phosphor 160 generates visible light and passes through the front substrate of the panel to be radiated to the outside to form an image.

Here, the common electrode 13 and the scan electrode 14 formed on the upper substrate 12 of the upper electrode assembly 11 are formed of a thin conductive metal having a high transmittance. It is preferable to use silver (Ag), copper (Cu), aluminum (Al), or chromium (Cr) as a material of this conductive metal. In addition, the bus electrode 15 may have a structure of Cr / Cu / Cr. The bus electrode 15 serves as an auxiliary electrode that prevents a voltage drop between the common electrode 13 and the scan electrode 14. Done.

The conductive metals 13 and 14 of the thin film, which is a characteristic component of the present invention, should be formed of a thin plate having a very thin thickness, for example, 200 mu m or less. Experiments have shown that the transmittance of visible light in a thin film electrode having a thickness of 100 μs is 90% or more. In addition, the reflectance may be minimized by the transparent dielectric layer 16 and the passivation layer 17 formed on one side of the conductive metals 13 and 14.

In addition, the conductive metals 13 and 14 are very advantageous in that they have very high electrical conductivity. The conductive metal electrode formed of silver (Ag) has an electrical conductivity of about 100 times that of the ITO electrode. Therefore, since the thickness of the silver electrode corresponding to the electrical conductivity of 1000 kW of ITO electrode is only 10 kW, the light transmittance of the conductive metal electrode is considerably improved for the same electric conductivity.

As described above, the structure of the upper electrode formed of the metal of the thin film is not limited to the above-described surface discharge plasma display device. That is, the present invention can be applied to all types of DC plasma display panels, AC plasma display panels, DC / AC hybrid plasma display panels, and opposing plasma displays, which can be classified according to discharge types.

As described above, the cathode ray tube display panel according to the present invention has the following advantages.

first. In the case where the upper electrode is formed of a conductive metal having a thickness of, for example, 100 kPa, not only the electrical conductivity but also the light transmittance are improved as compared with the conventional ITO electrode, so that the luminous efficiency is increased and the brightness of the panel can be improved.

Secondly, when using sputtering deposition, a thin film manufacturing method commonly used in forming electrodes, it is possible to use a metal which is cheaper than conventional ITO, which has a high price, and the formation thickness thereof is about 1/10 of that of conventional ITO. Therefore, the manufacturing cost of the product can be reduced.

Although the present invention has been described with reference to one embodiment illustrated in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent embodiments are possible.

Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

Claims (2)

An upper electrode assembly having a transparent upper substrate, a plurality of common electrodes and a plurality of scan electrodes formed in a predetermined pattern on the upper substrate, and a transparent dielectric layer formed to fill the plurality of common electrodes and the plurality of scan electrodes; A plasma display panel comprising a lower electrode assembly having a plurality of common electrodes and an address electrode corresponding to a plurality of scan electrodes and disposed below the upper electrode assembly to form a discharge space. And the plurality of common electrodes and the plurality of scan electrodes are each formed of a conductive metal having a thickness of 100 m or less. The method of claim 1, The conductive metal material is any one selected from the group consisting of silver, copper, aluminum and chromium.