KR100466278B1 - A Plasma Display Panel - Google Patents

Abstract

The present invention relates to a front substrate of a plasma display panel, wherein sustain electrodes of the front substrate are composed of a transparent electrode and a bus electrode disposed on the transparent electrode, and a black layer for improving contrast is provided between the transparent electrode and the bus electrode. Formed; The black layer is formed by drilling a portion corresponding to the upper surface of the barrier rib to form an opening, and extending the bus electrode in the opening, characterized in that the transparent electrode and the bus electrode is in direct contact. Therefore, according to the present invention, in the process of simultaneously forming the black layer and the black matrix, the lowering of the conductivity between the bus electrode and the transparent electrode generated by the black layer can be improved to prevent the lowering of the contrast.

Description

Plasma Display Panel {A Plasma Display Panel}

The present invention relates to a front substrate of a plasma display panel, and more particularly, to forming a front substrate of a plasma display panel, a black layer formed between a transparent electrode and a bus electrode and a black matrix formed between discharge cells. Or it relates to a structure that can prevent a decrease in conductivity between the bus electrode and the transparent electrode due to the black layer formed at the same time.

1 is a cross-sectional view illustrating an exploded perspective view showing a typical plasma display panel in a separated state.

As illustrated, the plasma display panel is coupled in parallel with the front substrate 10 and the rear substrate 20, which are display surfaces on which images are displayed, with a predetermined distance therebetween.

As shown in FIG. 2, a transparent electrode (or ITO electrode) 11a formed of indium tin oxide (ITO) material on the front substrate 10 and a metal material such as silver (Ag) are formed on the transparent electrode 11a. A plurality of sustain electrodes 11 on which the bus electrodes 11b are arranged are arranged in parallel.

In general, silver (Ag) constituting the bus electrode is not known to transmit light due to discharge and reflects to external light, and thus has a problem of poor contrast. In order to solve this problem, a black layer 11c is formed between the transparent electrode 11a and the bus electrode 11b to improve contrast.

The sustain electrode 11 is covered by a dielectric layer 12 that limits the discharge current and insulates the electrode pairs, and a protective layer 13 having magnesium oxide (MgO) deposited thereon to facilitate discharge conditions. Is formed.

In addition, between each of the sustain electrodes 11, a function of blocking light to reduce reflection by absorbing external light generated from the outside of the front substrate 10, and to improve the purity and contrast of the front substrate 10. The functioning black matrix 14 is arranged.

The rear substrate 20 has an address discharge at a portion where a plurality of discharge spaces, that is, stripe-type (or well-type) barrier ribs 21 for forming cells are arranged in parallel and intersect with the sustain electrode 11. A plurality of address electrodes 22 are generated in parallel with the partition wall 21 to generate vacuum ultraviolet rays.

In addition, an upper surface of the rear substrate is coated with an RGB fluorescent layer 23 that emits visible light for displaying an image in the partition 21, and a dielectric layer 24 is formed on the upper side of the address electrode 22 by firing. Is formed.

Looking at the process of manufacturing the front substrate 10 in the conventional plasma display panel configured as described above are as follows.

3 (a) to 3 (g) illustrate a process of manufacturing a front substrate of a conventional plasma display panel, in which a transparent electrode 11a of indium tin oxide (ITO) material is formed on the front substrate 10; The black paste for forming the layer is printed and dried at about 120 ° C. (a), and then printed with silver (Ag) paste for forming the bus electrode 11b thereon and dried (b). Next, after ultraviolet (UV) exposure using a photomask 30 (P / M) (c), after development, the resultant is calcined for about 3 hours in a kiln (not shown) of about 550 ° C. or more (d). Thereafter, the dielectric paste was printed and dried (e), and after the pattern was printed with the black matrix (BM) in the non-discharge region between the discharge cell and the discharge cell (f), the dielectric layer and the black matrix were simultaneously dried at about 550 ° C. In the above kiln (not shown), it is further baked for about 3 hours (g).

In forming a front substrate of a plasma display panel, a black layer 11c, a bus electrode 11b, and a black matrix are all printed and dried once at a time and are all completed by two firing steps. There was a long and costly problem.

In order to solve this problem, as shown in FIG. 4, a structure in which the black layer of the sustain electrode and the black matrix are integrally formed is proposed.

5A to 5E illustrate a process of manufacturing a front substrate of the plasma display panel according to the present invention shown in FIG. 4, wherein a transparent electrode 11a of indium tin oxide (ITO) material is formed on the front substrate 10. After printing the black paste for forming the black layer (11c) in the state and dried to about 120 ℃ and using a first photomask 30 (P / M) to expose the black layer forming portion as shown in Figure 4 ( a), the silver (Ag) paste for forming the bus electrode 11b is printed thereon, and then dried (b). Next, the bus electrode forming part was exposed to ultraviolet (UV) light using a second photomask 30 '(P / M) (c), and then developed for 3 hours in a firing furnace (not shown) of about 550 ° C. or more. Firing for a while (d). Thereafter, the dielectric paste is printed and dried and then fired (e).

As shown in FIGS. 4 and 5A to 5G, the simultaneous formation of the black layer and the black matrix simultaneously has the advantage of reducing the number of manufacturing processes, while the integrated black matrix must have non-conductive properties, although Although electrically conductive between the bus electrode and the transparent electrode, it may not have good conductivity due to its physical properties. As a result, the contact resistance increases between the bus electrode and the transparent electrode or exhibits non-uniform conduction characteristics, thereby causing a lateral line discharge failure of the panel.

Accordingly, an object of the present invention is to solve the above-described problems, and by simultaneously forming the black layer and the black matrix integrally, reducing the number of manufacturing steps, and increasing the contact resistance between the bus electrode and the transparent electrode. An object of the present invention is to provide a plasma display panel that can prevent and exhibit uniform conductive characteristics.

1 is an exploded perspective view for showing a typical plasma display panel;

2 is a cross-sectional view and an electrode arrangement illustrating a front substrate in a typical plasma display panel;

3A to 3G illustrate a front substrate manufacturing process of a conventional plasma display panel;

4 is a view showing a structure in which a black layer of a sustain electrode and a black matrix are integrally formed in a front substrate manufacturing process of a plasma display panel, and FIGS. 5A to 5E are views illustrating a front substrate manufacturing process of another conventional plasma display panel.

6 illustrates a structure of a front substrate of a plasma display panel according to an embodiment of the present invention;

7 illustrates a structure of a front substrate of a plasma display panel according to another embodiment of the present invention;

8 illustrates a structure of a front substrate of a plasma display panel according to another embodiment of the present invention; and

9 illustrates a structure of a front substrate of a plasma display panel according to another embodiment of the present invention.

*** Explanation of symbols for main parts of drawing ***

10,20; Front and rear substrates 11; Sustain electrode

11a; Transparent electrode 11b; Bus electrode

11c; Black layer 14; Black matrix

30,31,33,34; Opening

The first technical solution of the present invention for achieving the above object, the front substrate and the rear substrate arranged at a predetermined interval, a plurality of sustain electrodes arranged in parallel to the front substrate, the sustain electrodes on the back substrate 10. A plasma display panel comprising a plurality of address electrodes arranged in a direction crossing each other and partition walls arranged at a predetermined interval between the front substrate and the rear substrate to partition discharge cells, wherein the sustain electrodes of the front substrate are transparent. An electrode and a bus electrode disposed on the transparent electrode, and a black layer for contrast enhancement is formed between the transparent electrode and the bus electrode; The black layer is formed by drilling a portion corresponding to the upper surface of the barrier rib to form an opening, and extending the bus electrode in the opening, characterized in that the transparent electrode and the bus electrode is in direct contact.

A second technical solution of the present invention is a front substrate and a rear substrate arranged at a predetermined interval, a plurality of sustain electrodes arranged in parallel to the front substrate, the rear substrate is arranged in a direction crossing the sustain electrodes A plasma display panel comprising a plurality of address electrodes and barrier ribs arranged at a predetermined interval between the front substrate and the rear substrate to partition discharge cells, wherein the sustain electrodes of the front substrate are disposed on the transparent electrode and the transparent electrode. A black layer for contrast enhancement between the transparent electrode and the bus electrode; A black matrix is integrally formed with the black layer between the discharge cell and the discharge cell; The black layer is formed by drilling a portion corresponding to the upper surface of the barrier rib to form an opening, and extending the bus electrode in the opening, characterized in that the transparent electrode and the bus electrode is in direct contact.

A third technical solution of the present invention is a front substrate and a rear substrate arranged at a predetermined interval, a plurality of sustain electrodes arranged in parallel to the front substrate, the rear substrate is arranged in a direction crossing the sustain electrodes A plasma display panel comprising a plurality of address electrodes and barrier ribs arranged at a predetermined interval between the front substrate and the rear substrate to partition discharge cells, wherein the sustain electrodes of the front substrate are disposed on the transparent electrode and the transparent electrode. A black layer for contrast enhancement between the transparent electrode and the bus electrode; A black matrix is formed between the discharge cell and the discharge cell with the same material and the same height as the black layer; The black layer is formed by drilling a portion corresponding to the upper surface of the barrier rib to form an opening, and extending the bus electrode in the opening, characterized in that the transparent electrode and the bus electrode is in direct contact.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention for achieving the above object will be described in detail.

For convenience of description, the same parts and members as in the prior art will be described with the same reference numerals as in the prior art.

6 illustrates a structure of a front substrate of a plasma display panel according to an embodiment of the present invention, and a transparent electrode (or ITO electrode) 11a formed of indium tin oxide (ITO) material on the front substrate 10 and FIG. A plurality of sustain electrodes 11 in which a bus electrode 11b made of a metal material such as silver (Ag) is arranged on the transparent electrode 11a are arranged in parallel, and the transparent electrode 11a and the bus electrode are arranged in parallel. A black layer 11c is formed between the edges 11b to improve contrast, and the sustain electrode 11 is covered by a dielectric layer 12 which limits the discharge current and insulates the electrode pairs, and the discharge on the upper surface thereof. In order to facilitate the condition, a protective layer 13 on which magnesium oxide (MgO) is deposited is formed.

In the front substrate structure according to the present invention shown in FIG. 6, the black matrix 14 is first arranged side by side in a direction parallel to each other between the sustain electrodes (11). In addition, the black layer 11c is interposed between the transparent electrode 11a and the bus electrode 11b. Here, each of the sustain electrodes 11 absorbs external light generated outside the front substrate 10. The black matrix 14 functioning to block reflection and to reduce the reflection and to improve the purity and contrast of the front substrate 10, and the transparent electrode 11a and the bus electrode 11b are not formed separately. The black layer 11c for improving the contrast is extended to the adjacent discharge cells.

At this time, the portion of the black layer 11c between the transparent electrode 11a and the bus electrode 11b must have excellent conductivity in order to exhibit the function of the bus electrode 11b, and conversely, a black extending between adjacent discharge cells. The portion of layer 11c should have opposing conditions that must exhibit nonconductivity.

As a black powder contained in the black layer that satisfies these opposite conditions, a non-conductive cobalt (Co) oxide, chromium (Cr) oxide, manganese (Mn) oxide, copper (Cu) oxide, iron (Fe) -based Among the oxides and carbon (C) -based oxides, cobalt-based oxides (CoO ₂ ) were selected and included in the black layer, and various experiments were performed while varying the thickness thereof. As a result, the results are shown in Table 1 below. This experiment applied the same process conditions and the same frit glass.

Frit glass content (% by weight) Film thickness (㎛) Contact resistance (ITO / BUS electrode) Initial discharge voltage (V) Adhesion 5 0.1 4 181 △ 10 0.3 6 180 ○ 15 1.2 6 182 ◎ 20 2.5 8 182 ◎ 25 4.1 9 182 ◎ 30 5.0 10 185 ◎ 35 5.8 20 261 ◎ 40 6.1 27 267 ◎ 45 6.1 28 267 ◎ 50 3.6 28 268 ◎

In Table 1, the frit glass content refers to the amount contained in the black layer paste, and the thickness of the black layer is adjusted according to the frit glass content in the paste.

As shown in Table 1, when the amount of frit glass contained in the black paste was adjusted to 5 to 30% by weight, the black layer had a thickness of 0.1 to 5 µm, at which time the contact resistance was 4 to 10 kPa. The discharge voltage was also 181 to 185V. On the other hand, when the amount of frit glass contained in the black paste was adjusted to 35% by weight or more, the thickness of the black layer was 5.8 µm or more, and the contact resistance was very high at 20 kV and the initial discharge voltage was 261V.

As a result, the black layer containing the cobalt oxide black powder exhibits good conductivity with a contact resistance of 10 kPa or less when the thickness is 5.0 µm or less, and thus the bus electrode 11b is interposed between the bus electrode 11b and the transparent electrode. In the case of more than 5 μm, the contact resistance rapidly increases, and thus the bus electrode 11b may not play a sufficient role.

As described above, when the black layer is 5.0 µm or less, the contact resistance is 10 kPa or less, which shows good conductivity. However, according to the trend of increasing the size of the plasma display device, better conductivity is required. An opening 30 is formed in a portion of the black layer 11c between the electrode 11a and the bus electrode 11b so that the transparent electrode 11a and the bus electrode 11b are in direct contact with each other, thereby making contact with the black layer 11c. In other words, the black layer 11c has a hole corresponding to an upper surface of the partition wall 21 to form an opening 30, and an expansion of the bus electrode 11b is formed in the opening 30. The transparent electrode 11a is directly in contact with the bus electrode 11b. At this time, if the openings 30 are formed in all regions of the black layer 11c, the contrast improvement is reduced, so that the rear surface of the black layer 11c is reduced. Only for a portion corresponding to the partition wall 21 of the substrate It is preferable to form the openings 30 at intervals.

FIG. 7 is a diagram illustrating a structure of a front substrate of a plasma display panel according to another embodiment of the present invention, wherein the black layer 11c between the transparent electrode 11a and the bus electrode 11b is lined in a bus electrode extending direction. The opening 31 of the shape was formed to form a silver (Ag) paste containing black powder such as conductive ruthenium oxide (RuO ₂ ) to prevent a drop in contact resistance caused by the black layer 11c.

FIG. 8 is a view illustrating a structure of a front substrate of a plasma display panel according to another embodiment of the present invention, and absorbs external light generated from the outside of the front substrate 10 between the sustain electrodes 11 to reduce reflection. A black matrix 14 is formed separately which functions to block light and to improve the purity and contrast of the front substrate 10. At this time, a black layer between the transparent electrode 11a and the bus electrode 11b. An opening 33 is formed in the portion 11c, and the bus electrode 11b is formed in the opening 33 so that the transparent electrode 11a and the bus electrode 11b come into direct contact with the black layer 11c. As a result, when the openings 33 are formed in all regions of the black layer 11c, the contrast improvement is reduced, so that the openings 33 are formed only in the portions corresponding to the partition walls 21 of the rear substrate. It is preferable.

FIG. 9 is a view illustrating a structure of a front substrate of a plasma display panel according to another embodiment of the present invention, and absorbs external light generated from the outside of the front substrate 10 between the sustain electrodes 11 to reduce reflection. The black matrix 14 is formed separately to serve to block light and to improve the purity and contrast of the front substrate 10. At this time, the black between the transparent electrode 11a and the bus electrode 11b is formed. An opening 34 is formed in the portion of the layer 11c, and the bus electrode 11b is formed in the opening 30 so that the transparent electrode 11a and the bus electrode 11b are in direct contact with each other. Similarly, if the openings 33 are formed in all regions of the black layer 11c, the contrast improvement is lowered. Therefore, the openings 33 are formed only in portions corresponding to the partition walls 21 of the rear substrate. However, the opening 34 extends the partition wall 21. The transparent electrode 11a and the bus electrode 11b may be formed to extend to a portion of the transparent electrode 11a along the scent. In the meantime, the transparent electrode 11a and the bus electrode 11b through the opening 30 in FIGS. This direct contact is made possible by filling silver (Ag) in which black pigment is added to the opening 30. That is, the opening 30 is formed with respect to the entire height of the black layer 11c. That is, the opening 30 is a hole (Hall) shape of the upper and lower holes. In addition, the silver to which the black pigment filled in the opening 30 is added may be filled by the height of the black layer 11c or more so that the transparent electrode 11a and the bus electrode 11b may be in direct contact with each other.

Such a structure is not only applied to a structure in which the black layer 11c and the black matrix are separated as shown in FIG. 9, but also applied to a structure in which the black layer 11c and the black matrix are integral as shown in FIGS. 6 and 7. can do.

As described in detail above, the present invention provides a black layer and a black matrix structure that can simplify the manufacturing process, prevents an increase in contact resistance between the bus electrode and the transparent electrode, and exhibits uniform conductive characteristics. It works.

Up to now, the present invention is not limited to the preferred embodiments, and various modifications can be used by those skilled in the art. However, it is apparent that such modifications fall within the scope of the present invention.

Claims (7)

A front substrate and a rear substrate arranged at regular intervals, a plurality of sustain electrodes arranged parallel to the front substrate, a plurality of address electrodes arranged in a direction crossing the sustain electrodes on the back substrate, and the front substrate A plasma display panel comprising partition walls which are disposed at a predetermined interval between a substrate and a rear substrate to partition discharge cells. Sustain electrodes of the front substrate are composed of a transparent electrode and a bus electrode disposed on the transparent electrode, and a black layer for contrast enhancement is formed between the transparent electrode and the bus electrode; And the black layer has an opening formed by drilling a portion corresponding to an upper surface of the partition wall, and a bus electrode is formed in the opening to directly contact the transparent electrode and the bus electrode. A front substrate and a rear substrate arranged at regular intervals, a plurality of sustain electrodes arranged parallel to the front substrate, a plurality of address electrodes arranged in a direction crossing the sustain electrodes on the back substrate, and the front substrate A plasma display panel comprising partition walls which are disposed at a predetermined interval between a substrate and a rear substrate to partition discharge cells. Sustain electrodes of the front substrate are composed of a transparent electrode and a bus electrode disposed on the transparent electrode, and a black layer for contrast enhancement is formed between the transparent electrode and the bus electrode; A black matrix is integrally formed with the black layer between the discharge cells; And the black layer has an opening formed by drilling a portion corresponding to an upper surface of the partition wall, and a bus electrode is formed in the opening to directly contact the transparent electrode and the bus electrode. A front substrate and a rear substrate arranged at regular intervals, a plurality of sustain electrodes arranged parallel to the front substrate, a plurality of address electrodes arranged in a direction crossing the sustain electrodes on the back substrate, and the front substrate A plasma display panel comprising partition walls which are disposed at a predetermined interval between a substrate and a rear substrate to partition discharge cells. Sustain electrodes of the front substrate include a transparent electrode and a bus electrode disposed on the transparent electrode, and a black layer for contrast enhancement is formed between the transparent electrode and the bus electrode; A black matrix is formed between the discharge cells with the same material and the same height as the black layer; And the black layer has an opening formed by drilling a portion corresponding to an upper surface of the partition wall, and a bus electrode is formed in the opening to directly contact the transparent electrode and the bus electrode. The method according to any one of claims 1 to 3, And the opening of the black layer is filled with a silver (Ag) layer to which black pigment is added, and the transparent electrode and the bus electrode are in direct contact with the silver layer. The method of claim 4, wherein And the opening of the black layer has a line shape extending in the longitudinal direction of the sustain electrode. The method of claim 4, wherein And the opening of the black layer is formed only in a portion of the line extending in the longitudinal direction of the sustain electrode to correspond to the upper surface of the partition wall. delete