KR100740848B1 - Plasma display panel and methods for manufacturing thereof - Google Patents

Abstract

In the PDP of the present invention, in the plasma display panel for displaying an image by gas discharge using a plurality of discharge cells provided with a display electrode and an address electrode between the first substrate and the second substrate disposed opposite to each other, A slit portion is formed of the first and second substrates, and the display electrode or (and) address electrode is formed while the slit portion is filled with an end portion in the width direction.

Plasma, panel, manufacturing, slit, edge curl

Description

Plasma display panel and its manufacturing method {PLASMA DISPLAY PANEL AND METHODS FOR MANUFACTURING THEREOF}

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

FIG. 2 is a cross-sectional view of the plasma display panel cut along the line A-A of FIG.

3 is a flowchart illustrating a method of manufacturing a plasma display panel according to an embodiment of the present invention.

4 is a flowchart illustrating a manufacturing process of the plasma display panel of FIG. 3.

5 is a schematic diagram illustrating a method of forming a slit portion on a substrate using a photolithography method.

It is a schematic diagram explaining the printing method.

7 is a flowchart illustrating a method of manufacturing a plasma display panel according to another embodiment of the present invention for forming a bus electrode and a dark electrode.

8 is a flowchart illustrating a manufacturing process of the plasma display panel of FIG. 7.

9 is a schematic view illustrating a method of manufacturing a plasma display panel according to another embodiment of the present invention for forming a bus electrode and a dark electrode.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel and a method of manufacturing the same, and more particularly, to a method of manufacturing an electrode for preventing edge curl and a plasma display panel thereof.

In general, a plasma display panel (PDP) is a display device that realizes an image by using visible light generated by excitation of a phosphor by a vacuum ultraviolet ray (VUV) emitted from a plasma obtained through gas discharge. to be. Such a PDP can realize an ultra-large screen of 60 inches or more within a thickness of only 10 cm, and has a characteristic of excellent color reproducibility and less distortion due to a viewing angle because it is a self-luminous display device such as a CRT. In addition, the manufacturing method is simpler than the liquid crystal display, and thus has advantages in terms of productivity and cost, and thus has been in the spotlight as the next-generation industrial flat panel display and home TV display.

The structure of the PDP has been developed for a long time since the 1970s, and the structure generally known is a three-electrode surface discharge type structure. The three-electrode surface discharge type structure consists of one substrate including a display electrode located on the same surface and another substrate including an address electrode vertically spaced apart from the substrate by a predetermined distance therebetween, with a discharge gas enclosed therebetween. Structure. In general, the presence or absence of the discharge is determined by the discharge of the address electrode facing the scan electrode independently connected to each line, and the sustain discharge indicating the luminance is performed by two electrode groups located on the same plane. .

Such a display electrode is a strip-shaped thin plate provided along each discharge cell, and is generally manufactured by using a laminating method, an etching method, or the like. The laminating method is a method of forming an electrode layer on a substrate by thermally bonding a film made of an electrode material with a laminator and patterning the electrode layer. The etching method forms an electrode layer on a substrate and exposes the electrode layer using a photolithography process. It is a method of developing and producing an electrode pattern.

Display electrodes fabricated using these methods are subjected to a high heat firing process in a kiln for curing. As a result, the manufacturing of the display electrode is finished. At this time, an edge curl phenomenon occurs in which the end of the patterned electrode layer is rolled up from the substrate. In this state, when the dielectric layer is coated, a gap occurs between the end of the electrode layer and the dielectric layer, thereby causing a problem of lowering the breakdown voltage characteristic. In addition, a problem arises in that the dielectric property of the dielectric is destroyed as the electric field is concentrated on the edge portion.

Accordingly, the present invention has been made to solve the above problems, and provides a plasma display panel of the present invention and a method for manufacturing the same, in which an edge curl due to thermal deformation is not generated during a baking process while manufacturing a display electrode.

In order to achieve the above object, the plasma display panel provided in one embodiment of the present invention,

A plasma display panel for displaying an image by gas discharge using a plurality of discharge cells provided with a display electrode and an address electrode between a first substrate and a second substrate disposed to face each other, wherein the first and second substrates are selectively provided. The slits are formed, and the display electrodes or (and) address electrodes are formed while the slits are filled with end portions in the width direction.

In the present invention, the slit portion may be formed to extend along an end of the display electrode and / or address electrode. In this case, it is preferable that the slit portion is formed as a groove in which the slit portion is recessed into the substrate.

The present invention may further comprise a dark electrode for blocking external light along the non-display area where the discharge does not occur, and a slit portion is further formed along the widthwise end of the dark electrode, and the slit portion is filled. The dark electrode is formed.

Electrode manufacturing method of the plasma display panel provided in another embodiment of the present invention,

A method of manufacturing an electrode of a plasma display panel displaying an image by gas discharge, the method comprising: forming a slit portion on a substrate, applying an electrode paste onto the substrate while filling a pair of the slit portions, and the slit portion width of an electrode Patterning the electrode paste to form a directional end.

In the present invention, the slit portion may be formed by photolithography or sand blasting, and the electrode paste may be patterned by photolithography.

The electrode manufacturing method of the present invention can be used to form a display electrode, an address electrode, and a dark electrode.

Method of manufacturing a plasma display panel provided in another embodiment of the present invention,

A method of manufacturing an electrode of a plasma display panel displaying an image by gas discharge, the method comprising: forming first and second slit portions on a substrate, and applying electrode paste onto the substrate while filling the first and second slit portions. And patterning the electrode paste such that the first slit portion forms a widthwise end of the bus electrode and the second slit portion corresponds to the bottom surface of the dark electrode.

In the present invention, the bus electrode and the dark electrode may form a metal electrode made of a non-transmissive conductive material.

Electrode manufacturing method of the plasma display panel provided in another embodiment of the present invention,

A method of manufacturing an electrode of a plasma display panel displaying an image by gas discharge, the method comprising: forming first and second slit portions on a substrate and applying electrode paste onto the substrate while filling the first and second slit portions. Removing the electrode paste filling the second slit while patterning the electrode paste such that the pair of first slit forms a widthwise end of the bus electrode, and applying electrode paste 30 to the second slit. Thereby forming a dark electrode.

And when an electrode paste is printed in a 2nd slit part, an electrode paste can be apply | coated to a 2nd slit part using the printing method.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

FIG. 1 is a partially exploded perspective view illustrating a plasma display panel according to an embodiment of the present invention, and FIG. 2 is a partially combined cross-sectional view of the A-A line of FIG. 1.

As shown, in the PDP of the present embodiment, the first substrate 10 (hereinafter referred to as 'back substrate') and the second substrate 20 (hereinafter referred to as 'front substrate') are disposed to face each other at predetermined intervals. Color spaced discharge cells 18R, 18G, and 18B formed by the partition wall 16 are provided in the space between the substrates 10 and 20. In the discharge cell 18, a phosphor layer 19, which is excited by ultraviolet rays and emits visible light, is formed along the partition surface 161 and the bottom surface 141, and discharge gas (for example, to generate plasma discharge). Mixed gas containing xenon (Xe), neon (Ne), and the like.

The front substrate 20 is formed of a transparent material such as glass through which visible light can be transmitted so that an image is displayed. In the lower surface 201 of the front substrate 20, display electrodes 25 are formed to correspond to each discharge cell 18 in one direction (the x-axis direction of the drawing). These display electrodes 25 are composed of a scanning electrode and a sustain electrode in their functional operation. The scan electrode selects a discharge cell that is turned on by working with the address electrode 12, and the sustain electrode works with the scan electrode to cause sustain discharge for the selected discharge cell. Formally, this display electrode 25 is formed in strip shape, and is provided along each discharge cell.

A slit 23 is further formed on the lower surface 201 of the front substrate 20 along the place where the display electrode 25 is formed. The slit portion 23 is composed of thin grooves, and both ends 25a of the display electrode 25 are formed while filling the slit portion 23. Accordingly, both ends of the display electrode 25 are embedded in the front substrate 20 through the slit portion, and adhered to the substrate to prevent edge curl from occurring during the firing process. Of course, the slit portion 23 having such a function may be formed in the address electrode 12 in the same manner.

The display electrodes 25 are covered by a dielectric layer 28 formed of a dielectric such as PbO, B ₂ O ₃ , SiO _2, and the like, and the dielectric layer 28 is filled with charged particles during discharge. It prevents damage to the display electrodes 25 by directly colliding with and serves to induce charged particles.

The lower surface 281 of the dielectric layer 28 may be covered by a protective film 29 formed of MgO or the like. The protective film 29 may be charged when the charged particles collide directly with the dielectric layer 28 during discharge. ), And when charged particles collide with each other, the secondary electrons may be discharged to increase discharge efficiency.

In addition, the upper surface 101 of the rear substrate 10 facing the front substrate 20 extends in the direction in which the address electrodes 12 intersect the display electrodes 25 (y-axis direction in the drawing), and are spaced apart from each other. In this state, the discharge cells are arranged in a form corresponding to each discharge cell. The address electrodes 12 are covered with a dielectric layer 14 and buried therein, and the partition wall 16 is formed in a predetermined pattern on the dielectric layer 14.

The partition wall 16 divides the discharge cells 18, which are discharge spaces in which discharge is performed, to prevent cross talk between adjacent discharge cells 18. As shown, the partition 16 is mutually spaced apart from each other in a direction intersecting the vertical partitions 16a on the same plane as the vertical partitions 16a and the vertical partitions 16a. The horizontal partition walls 16b extending apart from each other define the discharge cells 18 having a closed structure. In the present embodiment, such a barrier rib structure is described as a preferred form, and thus, a barrier rib structure having various shapes such as a stripe-type barrier rib structure formed in parallel with the address electrode 12 while being located between the address electrodes 12 is also possible. Of course.

In the discharge cells 18, a fluorescent layer 19 that emits visible light by being excited by ultraviolet rays generated during discharge is formed. This fluorescent layer 19 is formed over the wall surface of the partition wall 16 and the lower surface of the dielectric layer 14 defined by the partition wall 16 as shown. The fluorescent layer 19 may be selected and formed as one of red, green, and blue phosphors for color expression, and thus may be divided into red, green, and blue phosphor layers. As described above, a discharge gas in which neon (Ne), xenon (Xe), or the like is mixed is filled in the discharge cells 18 in which the fluorescent layer 19 is disposed.

Hereinafter, the manufacturing method of the PDP which has a slit part as mentioned above with reference to FIG. 3 and FIG. 4 is demonstrated in detail. 3 is a flowchart illustrating a method of manufacturing a plasma display panel according to an exemplary embodiment of the present invention, and FIG. 4 is a flowchart illustrating a manufacturing process of a plasma display panel according to an exemplary embodiment of the present invention. Here, an example of manufacturing the electrode by the printing method will be described, but the present invention is not limited thereto.

Referring to the drawings, the electrode paste 30 is printed on the substrate 20 by supplying the substrate 20 having the slit portion 23 patterned to the printing apparatus (S11) (FIG. 4A). ) Reference). The electrode paste 30 is viscous as a composition in which raw materials of the electrode are mixed with substances such as volatile solvents, additives, and binders.

At this time, the slit portions 23 are provided on the substrate 20, and the slit portions 23 can be formed using an etching method or a sand blasting method. An etching method will be described with reference to FIG. 5 by applying a photosensitive agent 51, which is a photosensitive material, onto the substrate 20 (see (A)). Then, a mask 53 for pattern transfer of the electrode is placed on the photosensitive agent 51, and ultraviolet rays are irradiated thereon to selectively expose the photosensitive agent 51 (see (B)).

Then, the etching solution is sprayed onto the photosensitive agent 51 to develop the photosensitive agent 51. As a result, the pattern formed on the mask 53 is transferred to the photosensitive material 51 (see (C)).

Next, using the photoresist remaining on the substrate 20 as a barrier, selective etching is performed on the substrate 20 and the photoresist is peeled off (see (D)). As a result, a slit portion 23 that is a fine groove is formed on the substrate 20. The slit portion 23 is made in a shape that extends along the end of the electrode while contacting along the end of the electrode.

Sandblasting is a manufacturing method for forming a slit by applying a dry film on an electrode substrate, patterning the dry film using a photolithography process, and spraying an abrasive directly onto the substrate using the patterned dry film as a barrier. .

As such, as the electrode paste 30 is printed onto the substrate 20 provided with the slit portions 23, the electrode paste 30 is evenly printed on the entire substrate while the electrode paste 30 is filled in the slit portions 23. Printing of the electrode paste 30 is performed in the following manner. Referring to FIG. 6, the electrode paste 30 is discharged onto the screen mask 33. Then, as the squeezer 31 pushes the dielectric paste 30 and proceeds, the dielectric paste 30 is discharged through the mesh of a predetermined thickness provided in the screen mask 33 to be supplied onto the substrate 20. . Then, the screen mask 33 passed by the squeezer 31 is lifted up and separated from the electrode paste 30.

Next, the electrode paste 30 on the substrate from which the screen mask 33 is separated is flatly fixed over the entire substrate 20 while filling the slit 23 with its own force.

After the electrode paste 30 is printed between the slit portions 23 through the above process, the electrode paste 30 is dried (S12).

Next, the electrode paste 30 is patterned so that the slit part 23 forms the end part of an electrode (S13) (refer FIG. 4 (B)). When the example by the photolithography method is demonstrated, the mask which positions the mask which transfers the shape of an electrode on the electrode paste 30 is adjusted so that the edge part of an electrode may be located in the slit part 23, and a mask is arrange | positioned. Ultraviolet rays are irradiated onto the mask to expose the electrode paste 30, and then the etching solution is sprayed again to develop the electrode paste 30. Accordingly, the pair of slit portions 23 are patterned in a state in which both ends of the electrode are formed.

After the electrode paste 30 is patterned as described above, the substrate 20 is cured at a high temperature in a firing furnace to complete the electrode (S14). In the firing process, the end of the electrode is formed on the substrate 20 by the slit part 23. Since it is stuck, it is possible to prevent the problem of edge curl.

On the other hand, Figure 7 is a flowchart illustrating another embodiment in which the present invention is applied to the production of a PDP having a dark electrode that prevents the external light film reflection, Figure 8 is a schematic diagram thereof. The dark electrode is provided along the non-discharge area where discharge of the discharge cells does not occur, and serves to make the image clearly visible by reducing reflection by external light in the process of displaying the image by the PDP. In addition, the dark electrode is generally manufactured using a non-transmissive conductive material (eg, silver), and may be formed of the same material as the bus electrode. The description here describes an example in which the dark electrode is made of the same material as the bus electrode. The bus electrode refers to a metal electrode made of a non-transparent conductive material (eg, silver).

Referring to the drawings, the electrode paste 30 is printed onto the substrate 20 by supplying the substrate 20 having the slit portion 23 patterned to the printing apparatus (S31) (FIG. 8A). ) Reference). Here, the slit portion 23 includes a first slit portion 23a and a second slit portion 23b. The first slit portion 23a forms an end portion of the bus electrode, and the second slit portion 23b forms an end portion of the dark electrode. Since the slit portion 23 is formed in the same manner as described above, the detailed description thereof will be omitted. In addition, the electrode paste is a material forming the bus electrode and the dark electrode together, and has a viscosity as a composition in which a raw material such as silver is mixed with materials such as a volatile solvent, an additive, and a binder.

As such, the electrode paste 30 is printed onto the substrate 20 provided with the first and second slit portions 23a and 23b forming the bus electrode and the dark electrode, respectively. 23b) is printed evenly across the substrate as the electrode paste 30 is filled. The electrode paste 30 printing method here is the same as that described above.

After the electrode paste 30 is printed between the first and second slit portions 23a and 23b through this process, the electrode paste 30 is dried (S32).

Next, the electrode paste 30 is patterned so that the first and second slit portions 23a and 23b respectively form ends of the bus electrode and the black electrode (S33) (see FIG. 8B). ). That is, as described above, the mask is aligned with the first and second slit portions 23a and 23b using photolithography to pattern the electrode paste to form the bus electrode B and the dark electrode D, respectively. . At this time, the pair of first slit portions 23a correspond to the end portions of the bus electrodes B to form the end portions of the bus electrodes B, and one second slit portion 23b corresponds to the bottom surface of the dark electrode. It forms a bus electrode (B).

9 is a schematic diagram explaining an example of forming the dark electrode by another method. As in FIG. 7, the process of forming the first and second slits on the substrate is the same, but in this embodiment, the dark electrode is formed after the bus electrodes are sequentially formed in this embodiment.

That is, after applying the electrode paste 30 over the first and second slit portions 23a and 23b, only the bus electrode B is left and all the remaining electrode paste 30 is removed (FIG. 9A). Reference). That is, when the electrode paste 30 is removed using a mask, the pattern of the dark electrode D is selectively aligned along the second slit portion 23a to be exposed and developed to leave only the electrode paste for the bus electrode and the rest of the substrate. Peel off from.

Next, the electrode paste 30 is printed on the second slit portion 23b to complete the dark electrode (see FIG. 9B).

The example of sequentially forming the bus electrode and the dark electrode may be preferably used when the pattern of the bus electrode is complicated.

As described above, although the present invention has been described by way of limited embodiments and drawings, the present invention is not limited thereto and is intended by those skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of equivalents of the claims to be described.

According to the present invention, it is possible to solve the above-mentioned problem and to solve the short problem caused by the dark layer generated between the display electrodes. In addition, the present invention can solve the problem that the PDP stains due to the dark layer.

Claims (23)

A plasma display panel for displaying an image by gas discharge using a plurality of discharge cells provided with a display electrode and an address electrode between a first substrate and a second substrate disposed to face each other. And a slit portion formed to extend along the ends of the display electrode or the address electrode to the first and second substrates, and the display electrode or the address electrode is formed while filling the slit portion in the width direction. delete The method of claim 1, And the slit portion is formed as a recess in the substrate. The method of claim 1, Further comprising a dark electrode for blocking external light along the non-display area in which the discharge does not occur, A slit portion is further formed along an end portion of the dark electrode in the width direction, and the dark electrode is formed while filling the slit portion. In the electrode manufacturing method of the plasma display panel which displays an image by gas discharge, (A) forming a slit in the substrate, the slits being elongated along the ends of the electrodes; (B) applying an electrode paste over the substrate while filling the slit portion; And, (C) patterning the electrode paste such that the pair of slit portions form a widthwise end of the electrode; Electrode manufacturing method of a plasma display panel comprising a. delete The method of claim 5, The method of manufacturing a plasma display panel in which the slit portion is formed by a photolithography method in the step (A). delete The method of claim 5, The method of manufacturing an electrode of a plasma display panel in which the electrode paste is patterned by photolithography in the step (C). The method according to any one of claims 5, 7, and 9, The electrode of claim 1, wherein the electrode comprises a display electrode, an address electrode, and a dark electrode. In the electrode manufacturing method of the plasma display panel which displays an image by gas discharge, (A) forming first and second slit portions on the substrate; (B) applying an electrode paste over the substrate while filling the first and second slits; And, (C) patterning the electrode paste so that the pair of first slit portions form a widthwise end of the bus electrode, and the second slit portion corresponds to the bottom surface of the dark electrode; Electrode manufacturing method of a plasma display panel comprising a. The method of claim 11, The first and second slit portions are recessed grooves, the first slit portion is formed to extend along the end of the bus electrode, and the second slit portion is formed to extend along the bottom surface of the dark electrode. Manufacturing method. The method of claim 11, In the step (A), the first and second slits are formed by a photolithography method. delete The method of claim 11, The method of manufacturing an electrode of a plasma display panel in which the electrode paste is patterned by photolithography in the step (C). The method according to any one of claims 11 to 13 and 15, The method of manufacturing an electrode of a plasma display panel, wherein the bus electrode and the dark electrode form a metal electrode made of a non-transmissive conductive material. In the electrode manufacturing method of the plasma display panel which displays an image by gas discharge, (A) forming first and second slit portions on the substrate; (B) applying an electrode paste over the substrate while filling the first and second slits; (C) removing the electrode paste filling the second slit portion while patterning the electrode paste so that the pair of first slit portions form a widthwise end of the bus electrode; And, (D) applying an electrode paste (30) to the second slit to form a dark electrode; Electrode manufacturing method of a plasma display panel comprising a. The method of claim 17, The first and second slit portions are recessed grooves, the first slit portion is formed to extend along the end of the bus electrode, and the second slit portion is formed to extend along the bottom surface of the dark electrode. Manufacturing method. The method of claim 17, In the step (A), the first and second slits are formed by a photolithography method. delete The method of claim 17, The method of manufacturing an electrode of a plasma display panel in which the electrode paste is patterned by photolithography in the step (C). The method of claim 17, In the step (D), the electrode paste is applied to the second slit portion by the printing method of the electrode of the plasma display panel manufacturing method. The method according to any one of claims 17 to 19, 21 and 22, The method of manufacturing an electrode of a plasma display panel, wherein the bus electrode and the dark electrode form a metal electrode made of a non-transmissive conductive material.

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