KR100365351B1 - AC Driven Plasma Display Panel - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a plasma display panel which is a kind of flat panel display device.

2. Technical problem to be solved by the invention

In order to reduce the driving voltage, the present invention reduces the thickness of the front glass substrate, increases the height of the discharge cell, and removes the impurity gas emitted from the gas discharge by forming a white dielectric and a metal electrode outside the device. An object of the present invention is to provide an AC driven plasma display panel for improving the life of the device.

3. Summary of the Solution of the Invention

The present invention relates to an AC drive plasma display panel in which an upper plate and a lower plate are melt-bonded by an encapsulant containing frit glass as a main component to form a discharge cell, wherein the opposite side of the front glass substrate on which the transparent electrode is positioned is cut or molded to form a groove. Formed top plate; And a lower plate having a groove formed by cutting or molding the opposite side of the rear glass substrate on which the metal electrode is located.

4. Important uses of the invention

The present invention is used in the AC drive plasma display panel.

Description

AC Driven Plasma Display Panel

The present invention relates to a plasma display panel which is a kind of flat panel display device.

That is, the present invention provides a plasma display panel (PDP) used for a backlight, an illumination light source, or the like of a liquid crystal display (LCD) (hereinafter, simply referred to as "LCD"). (Hereinafter referred to simply as "PDP").

Recently, a plasma display panel is attracting attention as a large flat panel display device. The plasma display panel can be divided into a DC type and an AC type. In the case of a DC type plasma display panel, a cathode and an anode are exposed to a discharge space, whereas an AC type has a dielectric layer and a magnesium oxide (MgO) layer on each electrode. Covered with In any form, the ultraviolet rays generated by the discharge between the electrodes excite the phosphor coated on the inner surface of the discharge cell, and visible light is emitted from the phosphor by the principle of photoluminescence. At this time, the color display is applied in the same manner as the CRT by applying red, green, and blue phosphors to each display cell.

That is, a plasma display panel encapsulates a gas on two substrates coated with a plurality of electrodes and then applies a discharge voltage, and excites a phosphor formed in a predetermined pattern by ultraviolet rays generated by the discharge voltage. Refers to a device that obtains the desired numbers, 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 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. In the AC plasma display panel, 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 the corresponding electrodes.

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 sustaining discharge are generated between the two electrodes. The address electrode, the common electrode and the scan electrode corresponding thereto are provided for each addressing discharge and sustain discharge.

First, a structure of a conventional AC driven plasma display panel will be described with reference to FIG. 1.

1 is a cross-sectional view of an embodiment of a conventional AC-driven plasma display panel.

As shown in the figure, the structure of an AC drive type PDP element used for a back light of LCD and a light source for illumination is composed of an upper plate and a lower plate.

The upper plate is composed of a planar transparent electrode 102 formed on the front glass substrate 101 by vacuum evaporation and a three-wavelength white phosphor layer 103 printed on the opposite side of the transparent electrode to produce white light upon gas discharge. . In this case, since the front glass substrate 101 is positioned under the transparent electrode 102, the front glass substrate 101 also serves as a dielectric in a capacitive device such as a PDP device.

The lower plate limits the current flowing through the device by accumulating charge during alternating current with the metal electrode 105 formed of silver paste or the like on the rear glass substrate 104 by a thick film printing method, and also effectively reflects white light to prevent the front glass substrate 101. It is composed of a white dielectric layer 106 having a high light reflectance printed on the thick film and a three wavelength white phosphor layer 103 formed on the white dielectric layer 106 by thick film printing.

The upper plate and the lower plate are melt-bonded by the encapsulant 107 mainly containing frit glass to form a discharge cell 108 in which gas discharge can occur. After discharging the air in the discharge cell 108, a mixed gas such as argon (Ar), helium (He), neon (Ne), xenon (Xe), mercury (Hg), and the like is injected into the discharge cell 108 for a flat lamp. The PDP device is completed.

When alternating current is applied between the electrodes 102 and 105 of the PDP device, ultraviolet rays are generated from the discharge gas in the discharge cell 108 due to the discharge phenomenon. Phosphor 103 is excited by the generated ultraviolet rays, and white visible light 109 exits the front glass substrate 101.

The conventional flat lamp PDP device uses a front glass substrate as a dielectric, but uses a thick front glass substrate 101 having a thickness of several mm and the discharge cell 108 has a height of 1 mm or less. The disadvantage is that a high voltage close to 1 kV must be applied between the two electrodes 102 and 105 in order to produce it.

In addition, since the white dielectric 106 and the metal electrode 105 are contained in the discharge cell 108, impurity is released from the gas in the form of gas during gas discharge, which shortens the life of the device.

Therefore, when the voltage across the discharge cell 108 of the flat lamp PDP element, which is a capacitor having a layer structure, is increased when the height of the discharge cell is large compared to the thickness of the dielectric layer, the thickness of the front glass substrate 101 is made thin. In addition, the height of the discharge cell 108 needs to be increased, and the white dielectric 106 and the metal electrode 105 in the discharge cell 108 are formed outside the device to remove the impurity gas emitted from them during gas discharge. There is a need to improve the life of the device.

The present invention has been proposed by the necessity as described above, in order to reduce the driving voltage, the thickness of the front glass substrate is reduced, the height of the discharge cell is increased, the gas discharge by forming a white dielectric and a metal electrode in the discharge cell outside the device It is an object of the present invention to provide an AC driven plasma display panel for removing the impurity gas emitted from them to improve the life of the device.

1 is a cross-sectional view of an embodiment of a conventional AC-driven plasma display panel.

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

Explanation of symbols on the main parts of the drawings

201: front glass substrate 202: transparent electrode

202 ': bus electrode 204: rear glass substrate

205 ': metal electrode 207: encapsulant

208: discharge cell 209: white light

211: protective film 210: front glass substrate groove

210 ': Back glass substrate groove

In order to achieve the above object, the present invention provides an AC drive type plasma display panel in which an upper plate and a lower plate are melt-bonded by an encapsulant containing frit glass as a main component to form a discharge cell. A top plate formed by cutting or molding a groove; And a lower plate having a groove formed by cutting or molding the opposite side of the rear glass substrate on which the metal electrode is located.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an AC-driven plasma display panel (PDP) used for a back light, an illumination light source, etc. of a liquid crystal display (LCD). Process to secure the discharge space of the gas and expose the electrode to the outside of the discharge space, so that no additional dielectric layer is used, so the manufacturing method is simple and the manufacturing cost is reduced, while improving the driving voltage, lifetime and electrical connection with the driving circuit. The structure of the PDP element characterized by the above-mentioned.

Hereinafter, a preferred embodiment according to the present invention will be described in detail with reference to FIG. 2.

2 is a cross-sectional view of an embodiment of an AC driving plasma display panel according to the present invention.

That is, FIG. 2 shows the structure of a flat lamp PDP device having a long life and improving the structure of the conventional flat lamp PDP device shown in FIG. Basically, it has a structure of transparent electrode / front glass substrate / protective film / discharge cell / phosphor / rear glass substrate / metal electrode (transparent electrode may be located under the front glass substrate).

As can be seen from the figure, the plasma display panel (PDP) device for a flat lamp according to the present invention has a transparent electrode 202 and a bus electrode 202 'formed on the outer surface of the cut front glass substrate 201 and the inner surface thereof. The protective film 211 is formed in this. Similarly, a metal electrode 205 'is formed under the cut back glass substrate 204, and a white phosphor 203 is coated on the inner surface thereof to have a simple structure bonded to the encapsulant 207. Hereinafter, a manufacturing method of the PDP device for a flat lamp according to the present invention will be described in detail.

First, the manufacturing method of the top plate is as follows.

Indium tin oxide (In ₂ O ₃ Sn) is deposited on the front glass 201 having a thickness of about 3 mm by thousands of angstroms by vacuum deposition to form a transparent electrode 202. The bus electrode 202 ′ is formed at the edge of the transparent electrode 202 by vacuum depositing chromium (Cr) or aluminum (Al) by covering the transparent electrode 202 with a metal mask. When the area of the transparent electrode 202 is large, the bus electrode 202 'serves to maintain good discharge characteristics by reducing the resistance because the resistance increases accordingly.

The front glass on which the transparent electrode 202 is formed is cut by a sandblasting method or a photolithography method to cut the glass on the opposite side where the transparent electrode 202 is formed to a depth of several mm to form the groove 210.

The flaw 210 may be formed by melting the glass so as to have a shape of a groove by molding without having to cut the glass and dipping the glass into a mold. A metal mask is covered to expose only the defect 210, and the protective film 211 is formed by depositing thousands of angstroms of magnesium oxide (MgO) by a vacuum deposition method. The magnesium oxide (MgO) protective film 211 lowers the discharge voltage by discharging secondary electrons during gas discharge and prevents wear of the front glass substrate 201 due to ions generated during gas discharge.

Next, the manufacturing method of the lower plate will be described.

Chromium (Cr) or aluminum (Al) having good reflectance on the glass of the same material as that of the front glass is deposited by thousands of angstroms by a vacuum deposition method using a metal mask to form a metal electrode 205 '.

The back glass on which the metal electrode 205 'is formed is cut by a sandblasting method or a photolithography method to cut the glass on the opposite side where the metal electrode 205' is formed to a depth of several mm to form the groove 210 '. The grooves 210 'may be formed by melting the glass so as to have a shape of a flaw by molding without forming the glass and cutting the glass into a mold.

The white phosphor 203 is formed in the cut groove 210 'by the thick film printing method or the spraying method and then fired.

The fabricated front glass substrate 201 and back glass substrate 204 are thick film printed on the encapsulant 207 which is mainly composed of printed glass, and then stacked and melted and bonded in an electric furnace.

Exhaust the discharge cell 208 of the bonded electronic panel and inject a mixture of several tens to hundreds of Torr of argon (Ar), helium (He), neon (Ne), xenon (Xe), mercury (Hg), and the transparent electrode ( When an alternating voltage of 30 KHz is applied at about 300 V between the 202 and the metal electrode 205 ′, ultraviolet rays are generated from the injected mixed gas, and the white phosphor 203 is excited by the ultraviolet rays to obtain the white visible light 209.

In the PDP device for flat lamps formed in this manner, the transparent electrode 202 and the metal electrode 205 'are formed out of the glass substrate so that the front glass substrate 201 and the rear glass substrate 204 themselves serve as a substrate and a dielectric. At the same time, there is no emission of impurity gas from the white dielectric layer 206 and the metal electrode 205 as in the conventional PDP device, resulting in a long service life and eliminating the need for the white dielectric layer 206, thereby reducing manufacturing costs. By cutting the substrate, the thickness of the discharge cell 208 is much larger than that of the glass (dielectric), so that the driving voltage is greatly reduced.

In addition, since the two electrodes 202 and 205 'are exposed above and below the glass substrates 201 and 204, electrical connection with the driving circuit is easy, and both electrodes 202 and 205' do not protrude out of the encapsulant 207. It is convenient to use as a large lamp by connecting several devices.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the spirit of the present invention for those skilled in the art to which the present invention pertains, and the above-described embodiments and accompanying It is not limited to the drawing.

The present invention as described above, the transparent electrode and the metal electrode is formed on the outside of the front, rear glass substrate, there is an excellent effect that the white dielectric can be replaced by using the glass itself as a dielectric by cutting or molding the glass.

In addition, the present invention has an excellent effect that there is no emission of impurity gas from the white dielectric layer and the metal electrode to extend the life of the device and to reduce the manufacturing process and manufacturing cost.

In addition, the present invention has an excellent effect that low-voltage driving is possible by increasing the voltage applied to the discharge cell by making the glass thickness as small as possible.

That is, the AC drive plasma display panel manufactured according to the present invention not only significantly reduces the manufacturing cost and the driving voltage, but also the two circuits are formed outside the glass substrate, so that the bonding between the driving circuit and the electrodes is easy and the electrode joint is protruded. This does not occur, and there is an excellent effect that a large lamp can be manufactured by connecting several devices.

Claims (5)

In the AC drive type plasma display panel in which the upper plate and the lower plate are melt-bonded by an encapsulant mainly containing frit glass to form discharge cells. A top plate having a groove formed by cutting or molding the opposite side of the front glass substrate on which the transparent electrode is located on the outer surface, and a magnesium oxide (MgO) protective film formed on the inner surface of the groove; And The lower plate is formed by cutting or molding the opposite side of the rear glass substrate on which the metal electrode is located on the outer surface. The thickness of the discharge cell formed by melting the upper plate or the lower plate is greater than the thickness of the front glass substrate or the rear glass substrate cut or molded process AC drive type plasma display panel. delete delete delete delete