KR100570655B1 - Plasma display panel and method for manufacturing the same - Google Patents

Abstract

The present invention provides a method of manufacturing a plasma display panel that removes spots by forming boundary lines of overlapping laser patterns in a non-discharge region when patterning a transparent electrode material film by laser etching to form a transparent electrode.

A plasma display panel manufacturing method according to the present invention includes: a discharge sustaining electrode forming step of forming a discharge sustaining electrode on a first substrate; Forming an address electrode and a partition on the second substrate, wherein the address electrode and the partition are perpendicular to the discharge sustain electrode; And a bonding step of aligning and bonding the first and second substrates, wherein the discharge sustaining electrode forming step processes a transparent electrode material film by scanning a laser with an arbitrary laser pattern on the first substrate on which the transparent electrode material film is formed. Forming a transparent electrode, and forming a bus electrode by processing a metal conductive film formed on the transparent electrode, wherein the forming of the transparent electrode includes forming a boundary line of a laser pattern on a first substrate corresponding to a non-discharge area. Place it in

Plasma display, non-discharge area, transparent electrode, laser pattern

Description

Plasma display panel and manufacturing method thereof {PLASMA DISPLAY PANEL AND METHOD FOR MANUFACTURING THE SAME}

1 is a partially exploded perspective view schematically showing a part of a plasma display panel according to the present invention.

FIG. 2 is a cross-sectional view of a first substrate schematically illustrating a process of forming a transparent electrode material film pattern on a first substrate by a laser ablation method by a method of manufacturing a plasma display panel according to the present invention.

3 is a plan view of a first substrate schematically illustrating a process of forming a transparent electrode material film pattern on a first substrate by a laser etching method by a method of manufacturing a plasma display panel according to the present invention.

FIG. 4 is a plan view illustrating a matching relationship between a laser pattern and a discharge cell in which a transparent electrode material film pattern is formed on a first substrate by a laser etching method in a method of manufacturing a plasma display panel according to the present invention.

FIG. 5 is a partial plan view of a first substrate on which a transparent electrode material film pattern laser-etched by the laser pattern of FIG. 4 is formed.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel and a method for manufacturing the same, and more particularly, to a plasma display panel for forming a discharge sustaining electrode by a laser ablation method and a method for manufacturing the same.

In general, a plasma display panel (hereinafter referred to as a 'PDP') is used to display an image using a gas discharge phenomenon, and has excellent display capability such as display capacity, brightness, contrast, afterimage, viewing angle, It is in the spotlight as a device that can replace the CRT (Cathode Ray Tube). The PDP generates a gas discharge between the electrodes by a direct current or an alternating voltage applied to the electrode, and excites the phosphor by the radiation of ultraviolet rays, which emits light.

AC type PDPs, which are distinguished from the direct current type according to the driving method, form X electrodes and Y electrodes corresponding to discharge sustaining electrodes on the inner surface of the front substrate, and address electrodes and partition walls on the inner surface of the rear substrate. The X and Y electrodes are arranged in pairs with respect to one discharge cell, and sustain discharge occurs between the X and Y electrodes during PDP operation. In general, the X electrode, the Y electrode and the address electrode are formed in a stripe shape on the inner surface of the front substrate and the rear substrate, respectively, and cross each other at right angles to each other when the front substrate and the rear substrate are assembled to each other.

On the inner surface of the front substrate, a dielectric layer and a protective film are sequentially stacked. On the other hand, a partition wall is formed on the top surface of the dielectric layer on the back substrate, and the discharge cell is formed by the partition wall. In this discharge cell, an inert gas such as neon (Ne) and xenon (Xe) is filled. In addition, a phosphor is coated on the inner surface of the partition wall forming each discharge cell and the surface of the dielectric layer to form a phosphor layer. On the other hand, the X electrode and the Y electrode are usually composed of a transparent electrode and a bus electrode electrically connected to the transparent electrode.

When the operation of the PDP is schematically explained, first, an address voltage and a scan voltage are applied to the address electrode and the Y electrode, respectively, and address charges are generated therebetween, thereby forming wall charges in the discharge cells. Next, when a discharge sustain voltage is applied between the Y electrode and the X electrode, a sustain discharge occurs in the discharge cell when the discharge start voltage is exceeded while being added to the wall voltage formed by the wall charge. In this sustain discharge state, light in the ultraviolet region of the discharge light collides with the phosphor to emit visible light, and accordingly, each pixel formed for each discharge cell implements an image.

The image thus implemented is displayed forward through the front substrate provided with the transparent electrode and the bus electrode. The transparent electrode is formed of a transparent electrode material film, for example, an indium tin oxide (ITO) film, and the bus electrode is formed of a metal conductive film in order to increase the aperture ratio.

As a method of forming the transparent electrode, a photo lithography method and a laser ablation method are applied.

Briefly, the photolithography method first forms a transparent electrode material film on a front substrate, and then forms a photoresist layer thereon, and exposes and etches the transparent electrode material film in a desired pattern to form a desired shape. It is processed into a transparent electrode. However, this photolithography method repeatedly performs captive resist coating, patterning, and etching processes, thereby increasing the number of processes and thereby increasing the processing time.

Compared to the photolithography method, the laser etching method reduces the number of processes, reduces the process time, and when the transparent electrode material film is patterned, the transparent electrode material film is removed and the ends of the remaining portions are smoothly formed. It is used a lot because it has an advantage. In this laser etching method, the transparent electrode material film is directly etched using a laser having a wavelength capable of evaporating the transparent electrode material as it is easily absorbed by the transparent electrode material film and is converted into heat, thereby patterning the transparent electrode material film. To form.

In this laser etching method, a laser torch having a laser pattern corresponding to the shape of the transparent electrode to be finally formed is used. Conventionally, when the transparent electrode is formed with such a laser torch, efficient use of laser energy is used. For this purpose, the laser is scanned at least twice in a region corresponding to one discharge cell. In other words, the laser torch is moved by a predetermined pitch, and the transparent electrode material film is etched by scanning the laser while positioning the laser pattern in one discharge cell region.

However, in the above-described laser etching method, since the boundary portion of the laser pattern to which the laser is scanned is located at the center of the discharge cell, the laser scanning traces on the boundary portion of the laser pattern are kept on the front substrate by the heat during the laser scanning. Will remain.

Accordingly, in the conventional PDP, the surface traces of the front substrate are caused by the above traces, thereby causing unevenness, and the traces are located in the discharge cells, which are discharge regions (or display regions). As the light emitted from the region passes through the front substrate, the trace causes a slight difference in its transmittance, resulting in a staining phenomenon.

The present invention was devised to solve the above problems, and its object is to form a transparent electrode by patterning a transparent electrode material film by a laser etching method. To provide a plasma display panel and a method of manufacturing the same.

Plasma display panel manufacturing method according to the present invention in order to achieve the above object,

A discharge sustaining electrode forming step of forming a discharge sustaining electrode on the first substrate;

Forming an address electrode and a partition on the second substrate, wherein the address electrode and the partition are perpendicular to the discharge sustain electrode;

And a bonding step of aligning and bonding the first and second substrates.

The discharging sustain electrode forming step may include forming a transparent electrode by processing a transparent electrode material film by scanning a laser with an arbitrary laser pattern on the first substrate on which the transparent electrode material film is formed, and forming a metal conductive film formed on the transparent electrode. Processing to form a bus electrode,

In the transparent electrode forming step, the boundary line of the laser pattern is positioned on the first substrate corresponding to the non-discharge area.

In the transparent electrode forming step, a part of the laser pattern is overlapped to form a transparent electrode material layer pattern.

In the transparent electrode forming step, the laser pattern boundary line is disposed at a position corresponding to the vertical partition wall of the stripe discharge cell.

In the transparent electrode forming step, a laser pattern boundary line is formed at a position corresponding to a horizontal partition wall and a vertical partition wall of the closed discharge cell.

In the transparent electrode forming step, the transparent electrode material film pattern formed by laser etching is formed to match the discharge cell.

The transparent electrode forming step uses a laser torch having a substantially H-shaped laser pattern formed thereon.

In addition, the plasma display panel according to the present invention,

A first substrate having a plurality of discharge sustaining electrodes including a transparent electrode processed into a transparent electrode material film and a bus electrode processed into a metal conductive film on the transparent electrode, an address electrode perpendicular to the discharge sustaining electrode, The second substrate having a plurality of partition walls are formed by bonding,

A boundary line of a laser pattern used to pattern the transparent electrode material film is formed at a portion corresponding to the non-discharge region of the first substrate.

The first substrate includes a laser pattern boundary at a position corresponding to the vertical partition wall of the stripe discharge cell.

The first substrate has a laser pattern boundary at a position corresponding to a horizontal partition wall and a vertical partition wall of the closed discharge cell.

In the first substrate, a transparent electrode material film pattern formed by laser etching is coincident with the discharge cell.

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

1 is a partially exploded perspective view schematically showing a part of a plasma display panel according to the present invention.

Referring to the drawings, the PDP forms an X electrode 3 and a Y electrode 5 on the inner surface of the front substrate 1 (hereinafter referred to as a 'first substrate') and serve as discharge sustaining electrodes, and the rear substrate 7 The address electrode 9 and the partition 11 are formed on the inner surface of the second substrate hereinafter. The X and Y electrodes 3 and 5 are composed of a plurality of pairs, and sustain discharge occurs between the X electrode 3 and the Y electrode 5 during the operation of the PDP. The X electrode 3, the Y electrode 5, and the address electrode 9 are formed in stripe shapes on the inner surfaces of the first substrate 1 and the second substrate 7, respectively, to form the first substrate 1 and the first substrate. When the two substrates 7 are assembled together, they cross at right angles to each other.

The dielectric layer 13 and the protective film 15 are sequentially stacked on the inner surface of the first substrate 1. On the other hand, the partition 11 is formed on the upper surface of the dielectric layer 17 on the second substrate 7, and the discharge cell 19 is formed by the partition 11. The discharge cell 19 is filled with an inert gas such as neon (Ne) and xenon (Xe). In addition, the phosphor 21 is coated on a predetermined portion inside the partition 11 forming each discharge cell 19. On the other hand, the X electrode 3 and the Y electrode 5 are composed of transparent electrodes 3a and 5a for causing surface discharge and bus electrodes 3b and 5b for supplying current to the transparent electrodes 3a and 5a. The transparent electrodes 3a and 5a are formed of a transparent electrode material film to improve the front opening ratio, and the bus electrodes 3b and 5b are metal conductive films to supply current to the transparent electrodes 3a and 5a while reducing resistance. Is formed.

In the PDP, transparent electrodes 3a and 5a of the X and Y electrodes 3 and 5 are formed to protrude toward the center of the discharge cell 19. That is, the transparent electrodes 3a and 5a are discharged at random intervals from the bases 30a and 50a disposed along the one direction x of the first substrate 1 and the bases 30a and 50a. As it includes protrusions 32a and 52a which are arranged to protrude toward the center of the cell 19, the space formed between the protrusions 32a and 52a is defined by the transparent electrodes 3a and 5a which will be described later. The cutout 23 is removed by laser etching during the manufacturing process of the protrusions 32a and 52a.

In addition, the partition wall 11 forming the discharge cell 19 is formed in an open shape having a stripe shape, but is not limited thereto and may be formed in a closed shape such as a lattice shape. When the first substrate 1 and the second substrate 7 are assembled with each other, the central portion of the cutout 23 and the central portion of the corresponding portion of the first substrate 1 may be approximately equal to that of the partition 11. It is located in the center. A characteristic configuration of the first substrate 1 in the PDP will be described in detail through the following PDP manufacturing method.

In this PDP manufacturing method, the discharge sustaining electrode is formed on the first substrate 1, the address electrode / partition wall is formed on the second substrate 7, and the first and second substrates 1 and 7 thus formed are mutually connected. The process is largely divided into the steps to complete the PDP.

In the discharging sustain electrode forming step, the X and Y electrodes 3 and 5 are arranged in parallel on the inner surface of the first substrate 1 formed of glass and formed in a pair, and the X and Y electrodes 3 and 5 are formed. A plurality of pairs are formed, and the sustain electrode is completed by further embedding the pairs of the X and Y electrodes 3 and 5 thus formed into the dielectric layer 13 and the passivation layer 15.

Forming the X, Y electrodes 3, 5 comprises forming transparent electrodes 3a, 5a and forming bus electrodes 3b, 5b on the transparent electrodes 3a, 5a. . In the forming of the transparent electrodes 3a and 5a, a transparent electrode material film 17 (for example, ITO) is formed on the inner surface of the first substrate 1, and a laser pattern is formed on the transparent electrode material film. The transparent electrodes 3a and 5a are formed by laser etching the transparent electrode material film while the torch 28 is moved. In the forming of the bus electrodes 3b and 5b, a metal conductive film is formed on the transparent electrodes 3a and 5a and the metal conductive film is processed by laser etching, thereby forming the bus electrodes 3b and 5b into the transparent electrodes 3a and 5a. Laminated to form.

To this end, before forming the transparent electrodes 3a and 5a on the first substrate 1 before processing the bus electrodes 3b and 5b, alignment marks for forming the bus electrodes 3b and 5b are formed in advance. When the transparent electrode material film is formed on the basis of the alignment mark and the transparent electrode material film is processed by laser etching to form the transparent electrodes 3a and 5a, the transparent electrodes 3a and 5a and the bus electrode formed in a subsequent process ( 3b and 5b) coincide with each other.

In the transparent electrode forming step, the transparent electrode material layer is laser-etched while the laser torch 28 having the laser pattern is formed at a predetermined pitch to form transparent electrodes 3a and 5a. It is preferably formed on the first substrate 1 at a position corresponding to a non-discharge area of the PDP, for example, the center portion of the partition 11.

FIG. 2 is a cross-sectional view of a first substrate schematically illustrating a process of forming a transparent electrode material film pattern on a first substrate by a laser ablation method by a method of manufacturing a plasma display panel according to the present invention. FIG. 4 is a plan view of a first substrate schematically illustrating a process of forming a transparent electrode material film pattern on a first substrate by a laser etching method by a method of manufacturing a plasma display panel according to the present invention, and FIG. 4 is a plasma display panel according to the present invention. FIG. 5 is a plan view illustrating a matching relationship between a laser pattern for forming a transparent electrode material film pattern on a first substrate by a laser etching method and a discharge cell in a manufacturing method, and FIG. 5 is a transparent electrode material laser-etched by the laser pattern of FIG. 4. A partial plan view of the first substrate on which a film pattern is formed.

Referring to FIG. 2A, in order to form the transparent electrodes 3a and 5a, first, a transparent electrode material film 27 (eg, a transparent conductive film) that is a laser etching target on the first substrate 1 is formed. ).

The transparent electrode material film 27 is processed into transparent electrodes 3a and 5a on the first substrate 1 by a laser etching method along the transparent electrode material film pattern P (b, FIG. c). Here, the laser etching method proceeds in the x direction by one scan width on the upper side of the first substrate 1, moves in one line y direction, and advances by one scan width in the half x direction. The process of moving to the line y direction again and proceeding in the x direction by one scan width is repeated to form the transparent electrode material film pattern P in the y direction corresponding to the one scan width. In addition, the laser etching method forms a transparent electrode material film pattern P in the y direction corresponding to one scan width, and then moves further in the x direction by one scan width, thereby repeating the above process to repeat the above process. The formation of the transparent electrode material film pattern P is completed on the entire transparent electrode material film 27 in (1) (see Fig. 3).

When the transparent electrode material layer 27 is etched with a laser to form the transparent electrodes 3a and 5a as described above, the laser pattern LP formed on the laser torch 28 is the laser pattern LP etched in the previous time. While partially overlapping with the laser, the laser is moved in the laser etching direction (see FIG. 4). The laser pattern LP etches the transparent electrode material films 27 corresponding to the two discharge cells 19 by one laser etching, and overlaps the widths corresponding to the etched discharge cells 19. The process of etching the transparent electrode material layer 27 is repeatedly performed.

At this time, it is preferable to form the boundary lines BL (BLa, BLb) of the laser pattern LP on the first substrate 1 at a position corresponding to the non-discharge area, that is, the partition wall 11. The longitudinal boundary BLa of the laser pattern LP boundary line BL is disposed at a position corresponding to the vertical partition wall 11 in the case of a stripe discharge cell, and in the longitudinal direction in the case of a closed discharge cell. The boundary line BLa and the boundary line BLb in the horizontal direction are preferably disposed at positions corresponding to the vertical partition walls and the horizontal partition walls, respectively.

The boundary line BL of the laser pattern LP may have a stripe-type discharge cell even when the first substrate 1 is partially deteriorated due to excessive heat of the irradiated laser or a difference in the residual amount of the transparent electrode material due to laser etching occurs. Since it is formed in the vertical bulkhead 11 and the horizontal and vertical bulkheads of the closed type discharge cell, that is, in the non-discharge area, it does not affect the transmittance of the light emitted in the discharge cell 19, thereby causing stains in the middle of the discharge area. Can be prevented from occurring.

In addition, the boundary line BL of the laser pattern LP allows the transparent electrode material film pattern formed by one laser etching, that is, the transparent electrodes 3a and 5a to be formed in a state coinciding with the discharge cell 19. Such a laser pattern LP is formed in an approximately H shape, and in FIG. 4 of the present embodiment, one having a continuous H shape is illustrated.

After completing the transparent electrodes 3a and 5a while sequentially moving the laser torch 28 as shown in ①, ②, ③ and ④ of FIG. 4 (see c of FIG. 2), A metal conductive film 31 is formed on the transparent electrodes 3a and 5a (see d in FIG. 2). The metal conductive film 31 is processed by an etching process to form bus electrodes 3b and 5b (see e in FIG. 2).

As described above, after forming the X, Y electrodes 3, 5 having the transparent electrodes 3a, 5a and the bus electrodes 3b, 5b on the first substrate 1, the X, Y electrodes 3, 5) is filled with the dielectric layer 13 and the protective layer 15 to complete the discharge sustaining electrode.

In addition, after the address electrode 9 is formed on the second substrate 7, the dielectric layer 17 is formed, the partition 11 is formed on the dielectric layer 17, and the fluorescent layer 21 is formed to form the address. Complete the electrode / bulk.

The first and second substrates 1 and 7 thus produced are bonded to each other, the discharge spaces inside the first and second substrates 1 and 7 are exhausted to form a high vacuum, and then the discharge gas is sealed at a predetermined pressure. To complete the PDP.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the scope of the invention.

As described above, according to the present invention, when the transparent electrode material film is patterned on the first substrate of the plasma display panel to form the transparent electrode by a laser etching method, a portion of the first substrate corresponding to the non-discharge region forms a boundary line of the laser pattern to which the laser is scanned. By disposing it in, it has the advantage of laser etching, there is an effect of preventing the stain phenomenon due to the minute difference in transmittance due to the difference in the residual amount of the transparent electrode material in the glass deterioration and discharge region due to laser etching.

Claims (10)

A discharge sustaining electrode forming step of forming a discharge sustaining electrode on the first substrate; Forming an address electrode and a partition on the second substrate, wherein the address electrode and the partition are perpendicular to the discharge sustain electrode; And a bonding step of aligning and bonding the first and second substrates. The discharging sustain electrode forming step may include forming a transparent electrode by processing a transparent electrode material film by scanning a laser with an arbitrary laser pattern on the first substrate on which the transparent electrode material film is formed, and forming a metal conductive film formed on the transparent electrode. Processing to form a bus electrode, In the transparent electrode forming step, the boundary line of the laser pattern is positioned on the first substrate corresponding to the non-discharge area. The method of claim 1, The transparent electrode forming step of forming a transparent electrode material film pattern by overlapping a portion of the laser pattern. The method of claim 1, The transparent electrode forming step of the plasma display panel manufacturing method for arranging the laser pattern boundary line at a position corresponding to the vertical partition wall of the stripe discharge cell. The method of claim 1, The transparent electrode forming step is a plasma display panel manufacturing method for forming a laser pattern boundary line at a position corresponding to the horizontal partition wall and the vertical partition wall of the closed discharge cell. The method of claim 1, The transparent electrode forming step is a plasma display panel manufacturing method for forming a transparent electrode material film pattern formed by laser etching in accordance with the discharge cell. The method of claim 1, The transparent electrode forming step is a plasma display panel manufacturing method using a laser torch having a substantially H-shaped laser pattern formed. A first substrate having a plurality of discharge sustaining electrodes including a transparent electrode processed into a transparent electrode material film and a bus electrode processed into a metal conductive film on the transparent electrode, an address electrode perpendicular to the discharge sustaining electrode, The second substrate having a plurality of partition walls are formed by bonding, And a boundary line of a laser pattern used to pattern the transparent electrode material film on a portion corresponding to the non-discharge area of the first substrate. The method of claim 7, wherein And the first substrate includes a laser pattern boundary at a position corresponding to a vertical partition of the stripe discharge cell. The method of claim 7, wherein And the first substrate includes a laser pattern boundary at positions corresponding to horizontal and vertical barriers of the closed discharge cell. The method of claim 7, wherein The first substrate is a plasma display panel in which a transparent electrode material film pattern formed by laser etching coincides with a discharge cell.

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