KR20090091926A - Plasma display panel and method for fabricating in thereof - Google Patents

Abstract

A plasma display panel and a manufacturing method thereof are provided to prevent the malfunction during the driving process by preventing the short generated between electrode lines. An electrode of plasma display panel comprises a plurality of first electrode lines(610) and a plurality of second electrode lines(620). The first electrode line is formed parallel with the valid discharge plane. The second electrode line is formed from the first electrode line to the direction of the pad part. The electrode comprises a scan electrode, a sustain electrode, a bus electrode and an address electrode of the plasma display panel. The first electrode line generates the opposing discharge between the address electrode and the scan electrode. The first electrode line generates the surface discharge between the scan electrode and the sustain electrode. The pad part is the junction area between the electrode of the plasma display panel and the FPCB(Flexible Printed Circuit Board) of the drive unit. The first and second electrode lines are successively formed by the offset process.

Description

Plasma display panel and method for manufacturing the same

The present invention relates to an image display device, and more particularly, to a plasma display panel and a method of manufacturing the same.

With the advent of the multimedia era, display devices that can express more detailed, larger, and more natural colors are required. However, the current CRT (Cathode Ray Tube) has a limit to constitute a large screen of 40 inches or more, so that LCD (Liquid Crystal Display), PDP (PDP) and projection TV (Television), etc. are high quality. It is rapidly developing to expand its use in the field of imaging.

A PDP is an electronic device that displays an image by using plasma discharge. The PDP applies a predetermined voltage to an electrode disposed in the discharge space of the PDP so that plasma discharge occurs between them, and vacuum ultraviolet rays (VUV) generated during the plasma discharge are generated. ) Forms an image by exciting the phosphor layer formed in a predetermined pattern.

The electrodes used in the PDP include a transparent electrode and a bus electrode formed on the upper substrate of the PDP, an address electrode formed on the lower substrate of the PDP, and the like.

The electrodes may be manufactured using various methods such as a printing method, a green sheet method, and an offset method.

The offset method of the manufacturing method is a method used in the conventional printing media has the advantage of a simple process and excellent resolution.

1 is a view schematically illustrating an electrode pattern and a forming direction of a discharge part, a connection part, and a pad part of the related art using an offset method.

As shown in FIG. 1, the junction part of the discharge part 11 and the connection part 12 and the junction part of the connection part 12 and the pad part 13 are formed by bending an electrode line by using an offset method.

However, when the electrode line is bent from the discharge portion 11 to the connection portion 12, the bending position is the same, so that the distance d2 between the electrode lines of each of the connection portions 12 is the discharge portion 11. It becomes narrower than the space | interval d1 of an electrode line.

As described above, when the electrode line spacing d2 of the connecting portion 12 is narrowed, the electrode forming ink is pushed in the printing direction when performing the doctoring process of the offset method so that the adjacent electrode line and the short 14 are short. There is a problem.

An object of the present invention is to provide a plasma display panel and a method of manufacturing the same for preventing short circuits generated between electrode lines when printing an electrode pattern by using an off-set process.

According to another aspect of the present invention, there is provided a plasma display panel comprising: a plurality of first electrode lines formed in parallel with an effective discharge surface; And a plurality of second electrode lines bent from the extension line of the first electrode line toward the pad portion, wherein the first and second electrode lines are sequentially formed by an offset process, and the second electrode lines are respectively formed. It characterized in that the bending position of the different from each other have a gap or more than the interval of the first electrode line.

In this case, the innermost electrode line of the bent position among the second electrode lines may be bent first, and the outermost electrode line of the bent position may be bent last.

In addition, the lengths of the second electrode lines may be different from each other so that the bent positions may be different from each other. That is, the length of the second electrode line may be sequentially increased in the direction of the outermost electrode line from the innermost electrode line of the bent position.

In addition, the present invention provides a method of manufacturing a plasma display panel in which an electrode is formed by an offset method, wherein an intaglio for storing an electrode material is formed by a pad on a first electrode line formed on an effective discharge surface and an extension line of the first electrode line. Manufacturing a master mold formed to have a distance greater than or equal to the interval between the first electrode lines by changing the bending positions of the second electrode lines which are bent in the negative direction; Injecting an electrode material into the intaglio; Rolling off the electrode material by rolling a blanket on the master mold; Rolling the blanket on a substrate to set the electrode material to form the first and second electrode lines.

In this case, the master mold manufacturing step may form the intaglio so that the innermost electrode line of the bent position of the second electrode line is bent first, and the outermost electrode line of the bent position is bent last. have.

In addition, the master mold manufacturing step may form the intaglio so that the bending position is different from each other by forming the length of the second electrode line differently. That is, the length of the second electrode line may be sequentially increased in the direction of the outermost electrode line from the innermost electrode line of the bent position.

In addition, the electrode material may be an ink including silver (Ag), a binder, a solvent, and a dispersant.

The plasma display panel and the method of manufacturing the same according to the present invention have an effect of preventing malfunctions when the plasma display panel is driven by preventing shorts generated between the electrode lines during printing of the electrode pattern by using an off-set process. .

1 is a view schematically illustrating an electrode pattern and a forming direction of a discharge part, a connection part, and a pad part of the related art using an offset method.

2 is a view showing a discharge cell structure of a plasma display panel according to the present invention.

3A to 3C are cross-sectional views illustrating a front panel manufacturing process of a plasma display panel according to the present invention.

4A to 4F are cross-sectional views illustrating a rear panel manufacturing process of a plasma display panel according to the present invention.

5A is a view illustrating a process of bonding the front panel and the rear panel of the plasma display panel.

FIG. 5B is a cross-sectional view taken along line AA ′ of FIG. 5A.

6 is a view schematically showing an electrode pattern of a plasma display panel according to the present invention.

7 is a diagram illustrating an example of a process of manufacturing an electrode pattern of a plasma display panel using an offset method according to the present invention.

<Description of Major Symbols in Drawing>

110: back substrate 120: address electrode

130: lower plate dielectric 140: partition wall

150a, 150b, 150c: phosphor 160: discharge gas

170: front substrate 180a: scan electrode

180b: sustain electrode 180a ', 180b': bus electrode

190: top dielectric 195: protective film

610: first electrode line 620: second electrode line

630: pad portion 710: doctor ring

720: ink nozzle 730: master mold

740: blanket roll

Other objects, features and advantages of the present invention will become apparent from the following detailed description of embodiments with reference to the accompanying drawings.

Hereinafter, preferred embodiments of the present invention, in which the above object can be specifically realized, are described with reference to the accompanying drawings.

In the accompanying drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity.

In the plasma display panel according to the present invention, the front panel and the rear panel are bonded to each other with a partition wall therebetween. First, an embodiment of a plasma display panel according to the present invention will be described with reference to FIG. 2.

2 is a view showing a discharge cell structure of a plasma display panel according to the present invention.

As shown in FIG. 2, the plasma display panel of the present invention is formed of a scan electrode and sustain electrodes 180a and 180b made of indium tin oxide (ITO) in one direction on a front panel 170 and a conventional metal material. Bus electrodes 180a 'and 180b' are formed.

The top dielectric layer 190 and the passivation layer 195 are sequentially formed on the front substrate 170 while covering the scan electrode, the sustain electrode, and the bus electrode.

The front panel 170 is formed through a process such as milling and cleaning the glass for the display substrate.

Here, the scan electrode 180a and the sustain electrode 180b are formed of indium-tin-oxide (ITO), SnO ₂ , or the like by a photoetching method or an offset method by sputtering.

The bus electrodes 180a 'and 180b' include silver (Ag) and the like. In addition, a black matrix may be formed on the scan electrode and the sustain electrode, and may include a low melting glass and a black pigment.

The top dielectric layer 190 is formed on the front panel 170 on which the scan electrode, the sustain electrode, and the bus electrode are formed. Here, the top dielectric layer 190 comprises transparent low melting glass.

In addition, a protective film 195 is formed on the upper dielectric layer 190 to protect the dielectric from the impact of (+) ions during discharge and to increase secondary electron emission.

The passivation layer 195 may be formed using an electron beam deposition method, a sputtering method, an ion plating method, a screen printing method, or the like.

In addition, the passivation layer 195 may include a first layer 195a formed of an MgO thin film of magnesium oxide and a second layer 195b including a single crystal magnesium oxide powder.

At this time, a part of the first layer 195a, the particles containing the single crystal MgO nano-powder forms a second layer (195b) in the form of a cluster, so that the surface of the protective film as a whole is not flat and has an uneven shape. .

Accordingly, the amount of discharge of secondary electrons may increase and the discharge start voltage may decrease due to electronic interaction between the front panel 170 and the rear panel 110 during gas discharge of the plasma display panel, thereby increasing discharge efficiency. Reduce jitter

Meanwhile, an address electrode 120 is formed on one surface of the rear panel 110 along a direction crossing the sustain electrode pair, and the white lower plate dielectric is formed on the front surface of the back substrate 110 while covering the address electrode 120. Layer 130 is formed.

The lower dielectric layer 130 is applied by a printing method or a film laminating method, and then completed through a firing process.

The partition wall 140 is formed on the lower dielectric layer 130 to be disposed between the address electrodes 120. In this case, the partition wall 140 may be stripe-type, well-type, or delta-type.

In addition, phosphor layers 150a, 150b, and 150c of red (R), green (G), and blue (B) are formed between each partition wall 140. The point where the address electrode 120 on the rear panel 110 and the pair of sustain electrodes on the front substrate 110 cross each other constitutes a discharge cell.

In addition, the front panel 170 and the rear panel 110 are bonded to each other with the partition wall 140 interposed therebetween, and are bonded through a sealing material provided on the outer side of the substrate.

The front panel 170 and the rear panel 110 are connected to a driving device.

3A to 3C are cross-sectional views illustrating a front panel manufacturing process of a plasma display panel according to the present invention.

Hereinafter, a front panel manufacturing process of a plasma display panel according to the present invention will be described in detail with reference to FIGS. 3A to 3C.

First, as illustrated in FIG. 3A, the scan electrode 180a, the sustain electrode 180b, and the bus electrodes 180a 'and 180b' are formed on the front panel 170.

Here, the front substrate 170 is manufactured by milling and cleaning the glass or soda lime glass for the display substrate.

In addition, the scan electrode 180a, the sustain electrode 180b, and the bus electrodes 180a 'and 180b' may be formed by an offset method using silver paste according to the present invention.

Subsequently, an upper dielectric layer 190 is formed on the front panel 170 on which the scan electrode 180a, the sustain electrode 180b, and the bus electrodes 180a 'and 180b' are formed as shown in FIG. 3B.

The upper dielectric layer 190 may be formed by using a screen printing method, a coater method, and a lamination method of a low melting glass paste. The coater method may use any one of two methods, a roll or a slot.

Subsequently, a protective film 195 is deposited on the top dielectric layer 190 as shown in FIG. 3C.

Here, the protective film 195 according to the present invention comprises a first protective film 195a including magnesium oxide (MgO) and a second protective film 195b including magnesium oxide powder of single crystal.

The first passivation layer 195a is formed on the upper dielectric layer 190. And, a dopant such as silicon (Si) may be included. The first passivation layer 195a may be formed by chemical vapor deposition (CVD), electron beam (E-beam), ion-plating, sol-gel, sputtering, or the like.

At this time, when silicon is doped in the first passivation layer 195a, the jitter value of the address period is reduced. However, when the silicon content is larger than a predetermined value, the jitter value may be increased. Therefore, the silicon is preferably doped in a range where the jitter value is minimized, and it is preferable that the silicon is included in the protective film at an optimum content of 20 to 500 parts per million (ppm). And other materials may be used as dopants instead of silicon to reduce jitter.

The second passivation layer 195b is formed on the first passivation layer 195a as shown in the figure.

Here, the second passivation film 195b includes a single crystal magnesium oxide powder. At this time, the single crystal magnesium oxide powder in the second protective film 195b has a size of 5 to 100 micrometers.

Here, 'size' means the diameter if the crystal is in the shape of a sphere, and the length of one side if the shape of the cube. The single crystal refers to a solid in which all of the crystals are regularly formed along a constant crystal axis, and are distinguished from polycrystals, which are sets of small single crystals having different orientations.

4A to 4F are cross-sectional views illustrating a rear panel manufacturing process of a plasma display panel according to the present invention.

First, as shown in FIG. 4A, the address electrode 120 is formed on the rear panel 110. Here, the rear panel 110 forms a glass or soda-lime glass for display substrate through a process such as milling or cleaning (cleaning).

The address electrode 120 may be formed by an offset method using silver (Ag) paste.

As shown in FIG. 4B, a white lower dielectric layer 130 is formed on the rear panel 110 on which the address electrode 120 is formed.

The lower dielectric layer 130 is formed of a material including a low melting point glass and a filler such as TiO ₂ by screen printing or laminating green sheets.

Herein, the lower dielectric layer 130 may be white in order to increase the luminance of the plasma display panel. In order to simplify the process, the lower dielectric layer 130 and the address electrode 120 may be fired in one process.

Subsequently, partition walls are formed to distinguish each discharge cell from those shown in Figs. 4C to 4E.

At this time, the partition material 140a is prepared by mixing a solvent, a dispersant, a mother glass and a porous filler, and milling.

Here, as a mother glass, a flexible mother glass and a lead-free mother glass are mentioned. The lead-based mother glass includes ZnO, PbO, B ₂ O ₃ , and the like, and the lead-free mother glass includes ZnO, B ₂ O ₃ , BaO, SrO, CaO, and the like. And, as a filler, using an oxide such as SiO _2, Al ₂ O _3.

The barrier material 140a as described above is applied onto the lower plate dielectric layer 130 and then dried for a predetermined time.

Thereafter, the coating and drying processes are repeatedly performed to make a constant thickness (eg, 150-200 μm). Next, the partition material 140a is patterned to form the partition wall 140.

In this case, the patterning process is performed by covering and exposing the mask 155. That is, when the mask 155 is positioned and exposed to a portion corresponding to the address electrode, only the portion irradiated with light remains after the development and baking process to form the partition wall 140.

Next, as shown in FIG. 4F, phosphors 150a, 150b, and 150c are coated on the surface of the lower dielectric layer 130 in contact with the discharge space and on the side surface of the partition wall 140. ). That is, in the phosphor layer 250, phosphors of R, G, and B are sequentially applied according to respective discharge cells, and are applied by screen printing or photosensitive paste.

At this time, as the red (R) fluorescent material (Y, Gd) BO ^3: Use the Eu3 ⁺ and a green (G) fluorescent material, Zn ₂ SiO _4: to use Mn2 ^+, and blue (B) fluorescent materials is BaMgAl ₁₀ O _17: use a lot of Eu2 ^+.

Subsequently, the front panel 170 completed by the process of FIG. 3 is bonded and sealed with the rear panel 110 with the partition wall 140 interposed therebetween, and after exhausting impurities therein, the partition wall ( When the discharge gas 160 of Xe + Ne or Xe + He or Xe + Ne + He is injected into the discharge cell 140 and then sealed, the plasma display panel of FIG. 2 is completed.

Hereinafter, the sealing process of the front panel 170 and the rear panel 110 will be described in detail.

The sealing process is usually performed by screen printing, dispensing, or the like.

The screen printing method is a method of printing a sealing material having a desired shape by holding a patterned screen at a predetermined interval, placing the patterned screen on a substrate, and pressing and transferring a paste necessary for forming the sealing material. The screen printing method has advantages of simple production equipment and high use efficiency of materials.

The dispensing method is a method of forming a sealing material by directly discharging a thick film paste onto a substrate using air pressure using CAD wiring data used for screen mask fabrication. The dispensing method has the advantage of reducing the manufacturing cost of the mask and having a large degree of freedom in the shape of the thick film.

5A is a view illustrating a process of bonding the front panel and the rear panel of the plasma display panel.

FIG. 5B is a cross-sectional view taken along line AA ′ of FIG. 5A.

As shown, the sealing material 600 is applied to the front panel 170 or the rear panel 110. Specifically, the substrate is printed or dispensed at the same time with a predetermined interval at the outermost side of the substrate and applied.

Next, the sealing material 600 is fired. In the firing process, the organic material included in the sealing material 600 is removed, and the front panel 170 and the rear panel 110 are bonded.

In this firing process, the width of the sealing material 600 may be widened and the height may be low. In the present embodiment, the sealing material 600 is printed or coated, but may be formed in the form of a sealing tape and adhered to the front substrate 170 or the rear substrate 110. And the characteristic of a protective film etc. is improved at predetermined temperature through an aging process.

In addition, the front surface of the plasma display panel according to the present invention completed as described above is provided with a front filter 300, the front filter 300 is electromagnetic wave (EMI, abbreviated as 'EMI') and It shields near infrared rays (hereinafter abbreviated as 'NIR') and prevents color correction and reflection of light incident from the outside.

Hereinafter, an electrode pattern provided in the plasma display panel as described above will be described in detail with reference to FIG. 6.

6 is a view schematically showing an electrode pattern of a plasma display panel according to the present invention.

As shown in FIG. 6, the electrodes of the plasma display panel according to the present invention have a plurality of first electrode lines 710 formed in parallel with the effective discharge plane, and the pad portion 730 in an extension line of the first electrode lines. It is configured to include a plurality of second electrode line 720 is bent to form. In this case, the electrode includes a scan electrode 180a, a sustain electrode 180b, bus electrodes 180a 'and 180b', and an address electrode 120 of the plasma display panel.

In the present invention, in the first electrode line 710 formed on the effective discharge surface, opposite discharge occurs between the address electrode 120 and the scan electrode 180a of the plasma display panel, and the scan electrode 180a and the sustain electrode ( Surface discharge is generated between 180b) and the phosphor emits light by ultraviolet rays generated in the discharge cells so that visible light is emitted to the outside to display an image.

The pad part 730 is an area where the electrode of the plasma display panel is bonded to the flexible printed circuit board (FPCB) of the driving device.

In the present invention, the first and second electrode lines 710 and 720 are sequentially formed by an offset process, and the bending positions of the second electrode lines 720 are different from each other so that the interval between the first electrode lines is different. d'2) or more.

That is, in the present invention, in order to solve the problem caused by the same bending position of the conventional second electrode line 720, the first electrode line 710 by varying the bending position of each of the second electrode line 720. Has an interval d'2 equal to or greater than the interval d'1.

By having the electrode line structure as described above, it is possible to prevent the electrode forming ink from being pushed in the printing direction and shorted with the adjacent electrode line when performing the doctoring process of the offset method. In this case, reference numeral 740 of FIG. 7 indicates that the electrode forming ink is pushed in the printing direction.

That is, in the present invention, the second electrode line 720 has a structure in which the length thereof is sequentially increased in the direction of the outermost electrode line from the innermost electrode line of the second electrode line 720. Each bending position can be formed differently.

At this time, the innermost electrode line of the bent position of the second electrode line 720 is bent first, and the outermost electrode line of the bent position is bent last.

Hereinafter, a process of forming the electrode pattern of the plasma display panel described above with the offset method will be described in detail with reference to FIG. 7.

7 is a diagram illustrating an example of a process of manufacturing an electrode pattern of a plasma display panel using an offset method according to the present invention.

First, a master mold 730 to be used in an off-set process is manufactured, and an intaglio for injecting an electrode forming ink to be used as an electrode is formed in the master mold 730, and the intaglio is a first electrode. The interval d between the first electrode line 710 by changing the bending position of the second electrode line 720 which is bent in the direction of the pad portion 730 from the line 710 and the extension line of the first electrode line 710. It is formed to have an interval d'2 of '1) or more.

Subsequently, an electrode forming ink is injected into the intaglio, and since the ink is used as the material of the electrode, silver (Ag), a binder, a solvent, a dispersant, and the like are preferably in the form of a paste.

The electrode forming ink is filled in the intaglio of the master mold 730 through the ink nozzle 720.

Next, a doctor ring 710 is used to remove the remaining ink except for the amount of the electrode forming ink to fill in the intaglio of the master mold 730.

Next, the blanket roll 740 and the master mold 730 are brought into contact with each other to transfer ink existing on the surface of the master mold 730 to the surface of the blanket roll 740. Rolling a blanket roll 740 in contact with the master mold 730 turns off the ink stored in the intaglio of the master mold 730, thereby causing the blanket roll 740 to roll. Ink is bonded to the surface.

Next, when the blanket roll 740 to which the ink is bonded is rolled on the substrate of the plasma display panel, the ink is separated from the surface of the blanket roll 740 and set on the substrate. An electrode pattern according to the invention is formed.

It will be apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit and essential features of the present invention. For example, it will be very easy for those skilled in the art to use the above-described embodiments in combination with each other.

Accordingly, the above detailed description should not be construed as limiting in all aspects and should be considered as illustrative.

The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention.

Claims (9)

In the plasma display panel, A plurality of first electrode lines formed parallel to the effective discharge surface; And Includes; a plurality of second electrode line is bent in the direction of the pad portion from the extension line of the first electrode line, And the first and second electrode lines are sequentially formed by an offset process, and have a distance greater than or equal to the interval of the first electrode lines by different bending positions of the second electrode lines. According to claim 1, And the innermost electrode line at the bent position among the second electrode lines is bent first, and the outermost electrode line at the bent position is bent last. According to claim 1, And forming the lengths of the second electrode lines differently so that the bent positions are different from each other. The method of claim 3, wherein And a length thereof gradually increases from the innermost electrode line at the bent position of the second electrode line toward the outermost electrode line. In the manufacturing method of the plasma display panel which forms an electrode by the offset method, The intaglio for storing the electrode material is different from the bending position of each of the first electrode line formed on the effective discharge surface and the second electrode line formed by bending in the direction of the pad portion from the extension line of the first electrode line. Manufacturing a master mold formed to have a distance of at least; Injecting an electrode material into the intaglio; Rolling off the electrode material by rolling a blanket on the master mold; And Rolling the blanket onto a substrate to set the electrode material to form the first and second electrode lines. The method of claim 5, wherein the master mold manufacturing step, Wherein the intaglio is formed so that the innermost electrode line of the bent position among the second electrode lines is bent first, and the outermost electrode line of the bent position is bent last. Way. The method of claim 5, wherein the master mold manufacturing step, And forming the intaglios so that the bent positions are different by forming lengths of the second electrode lines different from each other. The method of claim 7, wherein And a length thereof is sequentially increased in the direction of the outermost electrode line from the innermost electrode line at the bent position among the second electrode lines. The method of claim 5, wherein the electrode material, It is an ink containing silver (Ag), a binder, a solvent, and a dispersing agent. The manufacturing method of the plasma display panel characterized by the above-mentioned.