KR100728198B1 - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to improve response speed and emission stability by controlling diffraction strength of an MgO protective layer. First and second substrates(1,11) are arranged in parallel at a preset interval. Plural address electrodes(3) are formed on the first substrate. A first dielectric(5) is formed on the whole surface of the first substrate to cover the address electrodes. Plural partitions(7) are provided in a predetermined height with the first dielectric and form discharge spaces. A fluorescent layer(9) is formed in the discharge space. Plural display electrodes(13) are arranged on a surface of the second substrate opposite to the first substrate to cross the address electrodes. A second dielectric(15) is formed on the whole surface of the second substrate to cover the display electrodes. A protective layer(17) coats the display electrodes and includes MgO. X-ray diffraction strength with respect to a [111] surface of the MgO is A. X-ray diffraction strength with respect to a [220] surface of the MgO is B. X-ray diffraction strength with respect to a [200] surface of the MgO is C. It is satisfied that A :(B + C + D) = 6 : 4 to 10 : 0 or (A + B) : (C + D) = 8 : 2 to 10 : 0.

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

1 is a cross-sectional view schematically showing the structure of a plasma display panel of the present invention.

Figure 2 is a graph showing the measurement of the discharge delay time of the protective film prepared according to Examples 1 to 5 and Comparative Examples 1 to 6 of the present invention.

Figure 3 is a graph showing the measurement of the discharge delay time of the protective film prepared according to Examples 6 to 8 and Comparative Examples 7 to 14 of the present invention.

[Industrial use]

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel with improved display quality.

[Prior art]

In general, a plasma display panel (PDP) is a display device that realizes an image by using visible light generated by vacuum ultraviolet (VUV) radiation emitted from a plasma formed by gas discharge to excite a phosphor layer. The plasma display panel has a high resolution and large screen configuration, and has been spotlighted as a next generation thin display device.

The general structure of the plasma display panel is a three-electrode surface discharge type structure. The three-electrode surface discharge structure includes a front substrate on which a display electrode composed of two electrodes is formed, and a back substrate on which an address electrode is formed at a predetermined distance from the substrate, wherein the display electrode is covered with a dielectric layer. . The space between the front substrate and the rear substrate is partitioned into a plurality of discharge cells by partition walls, discharge gas is injected into the discharge cells, and a phosphor layer is formed on the rear substrate side.

The electrode, the partition, the dielectric layer, etc. are generally formed by a printing process in consideration of economical aspects, so that a thick film is formed, and thus the film formation state is considerably poorer than a thin film process.

Therefore, the sputtering of the electrons and ions generated by the discharge damages the dielectric layer and the lower electrode, thereby shortening the life of the AC plasma display device.

To solve this problem, in order to reduce the influence of ion bombardment during discharge, a protective film is formed on the dielectric layer with a thickness of about several hundred nm. In general, MgO is used as the protective film material. The protective film made of MgO lowers the discharge voltage and protects the dielectric layer by sputtering, thereby extending the life of the AC plasma display device.

The protective film is greatly changed in accordance with film forming conditions such as heat deposition, and thus it is difficult to maintain a constant display quality. That is, the passivation layer is likely to generate black noise due to an address discharge delay, that is, a discharge miss, a phenomenon in which a cell selected to emit light does not emit light. The occurrence of such black noise can easily occur at the boundary between the light emitting area and the non-light emitting area in the screen, but appears at a certain place, and the discharge miss is low in intensity when there is no address discharge or even scanning discharge is performed. Caused by

Therefore, various studies have been conducted to reduce the address discharge delay time.

SUMMARY OF THE INVENTION An object of the present invention is to provide a plasma display panel which can improve response speed to improve discharge stability and improve display quality.

In order to achieve the above object, the present invention comprises a first and second substrate disposed substantially parallel at any interval; A plurality of address electrodes formed on the first substrate; A first dielectric layer formed over the first substrate while covering the address electrodes; A plurality of partition walls provided to the first dielectric layer at a predetermined height and forming a discharge space; A fluorescent layer formed in the discharge space; A plurality of display electrodes disposed on one surface of the second substrate opposite to the first substrate in a direction crossing the address electrodes; The second dielectric layer and the second dielectric layer are formed on the entire surface of the second substrate while covering the display electrodes, and include MgO, and the diffraction intensity of (111) of MgO is determined on the A and (220) planes. When the diffraction intensity of the B and (200) planes is the C and the diffraction intensity of the (311) plane as D, a plasma display panel satisfying the following conditions is provided.

A: (B + C + D) = 6: 4 or more or (A + B): (C + D) = 8: 2 or more

Hereinafter, the present invention will be described in more detail.

The present invention relates to a protective film in a plasma display panel. The passivation layer is to prevent the dielectric layer and the electrodes below it from being damaged by ion bombardment during discharge in the plasma display panel. The protective film is generally formed of MgO. Recently, research has been conducted to improve discharge stability by improving the response speed of the plasma display panel and to thereby improve display quality of the screen.

In the present invention, the above-mentioned effect is to be obtained by controlling the diffraction intensity of the MgO protective film.

That is, in the protective film of the present invention, the (220) plane (also referred to as (110) plane), the (200) plane (also referred to as (100) plane), and (311) plane to the X-ray diffraction intensity of the (111) plane X-ray diffraction intensity of the A: (B + C + D) or (A + B): by adjusting the ratio of (C + D) to a certain range to improve the discharge stability.

In the present invention, X-ray diffraction intensity of (111) plane is A, X-ray diffraction intensity of (220) plane is B, X-ray diffraction intensity of (200) plane is C, X-ray of (311) plane Assuming that the line diffraction intensity is D, A, B, C and D satisfy the following conditions.

A: (B + C + D) = 6: 4 or more or (A + B): (C + D) = 8: 2 or more

At this time, the "above" means that the values of A and (A + B) increase in A: (B + C + D) and (A + B): (C + D), and therefore, A: ( B + C + D) = 6: 4 to 10: 0 or (A + B): (C + D) = 8: 2 to 10: 0 is more preferred.

In the value of A: (B + C + D) or (A + B): (C + D), most preferably, the value of (B + C + D) or (C + D) is 0 desirable. This case refers to the case where only peaks corresponding to the (111) plane (corresponding diffraction intensity: A) or (111) plane and (220) (corresponding diffraction intensity: B) plane appear, where A or (A + B ) Is represented by 10.

When the above conditions are satisfied, the response speed can be improved, which is preferable.

Such diffraction intensity of the MgO protective film of the present invention can be obtained by adjusting the water pressure (H ₂ O Partial Pressure) in the process of forming the protective film, preferably the ion plating process. That is, the protective film diffraction intensity condition of the present invention can be obtained by adjusting the water pressure to 1.0 X 10 ^-7 torr to 7 X 10 ^-6 Torr in the process of forming the protective film.

An example of the plasma display panel of the present invention having the protective film is shown in FIG. 1, but the structure of the plasma display panel of the present invention is not limited to FIG. 1.

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

As shown in FIG. 1, the plasma display panel of the present invention includes a first substrate 1 (rear substrate) and a second substrate 11 (front substrate) disposed substantially parallel to each other at arbitrary intervals.

A plurality of address electrodes 3 are formed on the first substrate 1 (back substrate) along one direction (Y direction in the drawing), and cover the address electrodes 3 to the first substrate 1. The first dielectric layer 5 is formed. A plurality of barrier ribs 7 are formed on the first dielectric layer 5 between the address electrodes 3 at predetermined heights and form a discharge space. The barrier ribs 7 may be open or closed as necessary. Can be formed. Red, green, and blue (B) phosphor layers 9 are located between the partitions 7. One surface of the second substrate 11 (front substrate) facing the first substrate 1 includes a pair of transparent electrodes 13a and bus electrodes 13b in a direction crossing the address electrodes 3. Display electrodes 13 are formed, and the protective layer 17 of the present invention includes a dielectric layer 15 on the entire second substrate 11 and MgO on the dielectric layer 15 while covering the display electrodes 13. This is located.

Since the method of manufacturing the plasma display panel of the present invention having the above-described structure is well known in the art, detailed description thereof will be omitted since it is well understood by those skilled in the art. However, the main features of the present invention will be described in detail only for the forming process of the protective film.

The protective film of the present invention may be formed by a thick film printing method using a paste and a deposition method using a plasma. Among them, the thick film printing method is relatively weak to sputtering due to the impact of ions, and the discharge sustain voltage and discharge start by secondary electron emission. Since it is difficult to expect a decrease in voltage, it is preferable to use a deposition method using plasma.

As the method of forming the protective film by the plasma deposition method, an electron beam deposition method, an ion plating method, a magnetron sputtering method, or the like may be used, and an ion plating method is most preferable.

In this case, the protective film diffraction intensity condition of the present invention is obtained by adjusting the water pressure (H ₂ O Partial Pressure) in the process of forming the protective film, particularly in the ion plating process. That is, the protective film diffraction intensity condition of the present invention can be obtained by adjusting the water pressure to 1.0 X 10 ^-7 torr to 7 X 10 ^-6 Torr in the process of forming the protective film.

Hereinafter, preferred examples and comparative examples of the present invention are described. However, the following examples are only one preferred embodiment of the present invention and the present invention is not limited to the following examples.

(Example 1)

A display electrode including an indium tin oxide transparent electrode and a silver bus electrode was formed in a stripe shape on a front substrate made of soda lime glass in a conventional manner.

Subsequently, a paste of lead-based glass was coated over the entire surface of the front substrate on which the display electrode was formed and baked to form a dielectric layer.

An MgO protective film was prepared by an ion plating process on the dielectric layer to prepare an upper panel. The water pressure during the ion plating process was adjusted to 9.6 X 10 ^-7 Torr.

The X-ray diffraction intensities of the (111), (220), (200) and (311) planes of the prepared MgO protective film were measured using CuKα rays, and A: (B + C + D) was 1.5.

(Examples 2 to 5 and Comparative Examples 1 to 6)

The water pressure during the ion plating process of forming the MgO protective film was changed as shown in Table 1, and was carried out in the same manner as in Example 1 except that A: (B + C + D) shown in Table 1 was obtained. .

(Examples 6 to 8 and Comparative Examples 7 to 14)

In the same manner as in Example 1, except that (A + B): (C + D) shown in Table 1 was obtained by changing the water pressure during the ion plating process of MgO protective film formation as shown in Table 1 below. Was carried out.

Water Pressure (Torr) A: (B + C + D) Example 1 9.6 X 10 ^-7 6: 4 Example 2 8.6 X 10 ^-7 7: 3 Example 3 6.2 X 10 ^-7 8: 2 Example 4 3.3 X 10 ^-7 9: 1 Example 5 1.5 X 10 ^-7 10: 0 Comparative Example 1 2.2 X 10 ^-6 5: 5 Comparative Example 2 4.3 X 10 ^-6 4: 6 Comparative Example 3 5.8 X 10 ^-6 3: 7 Comparative Example 4 6.7 X 10 ^-6 2: 8 Comparative Example 5 7.5 X 10 ^-6 1: 9 Comparative Example 6 8.6 X 10 ^-6 0: 10 Water pressure  (A + B): (C + D) Example 6 6.9 X 10 ^-7 8: 2 Example 7 4.7 X 10 ^-7 9: 1 Example 8 2.2 X 10 ^-7 10: 0 Comparative Example 7 9.2 X 10 ^-7 7: 3 Comparative Example 8 1.5 X 10 ^-6 6: 4 Comparative Example 9 3.4 X 10 ^-6 5: 5 Comparative Example 10 5.3 X 10 ^-6 4: 6 Comparative Example 11 6.4 X 10 ^-6 3: 7 Comparative Example 12 7.3 X 10 ^-6 2: 8 Comparative Example 13 8.9 X 10 ^-6 1: 9 Comparative Example 14 9.8 X 10 ^-6 0: 10

The discharge delay time of the protective film prepared according to Examples 1 to 5 and Comparative Examples 1 to 6 was measured and the results are shown in FIG. 2 and the discharge delay of the protective film prepared according to Examples 6 to 8 and Comparative Examples 7 to 14. Time was measured and the result is shown in FIG. As shown in Figure 2 and 3, by controlling the diffraction intensity of MgO it was possible to reduce the discharge delay time.

As described above, the plasma display panel of the present invention may improve the response speed by adjusting the diffraction intensity of the MgO passivation layer, thereby improving discharge stability, thereby improving display quality of the screen.

Claims (5)

First and second substrates disposed substantially parallel at any interval; A plurality of address electrodes formed on the first substrate; A first dielectric layer formed over the first substrate while covering the address electrodes; A plurality of partition walls provided with the first dielectric layer and having a predetermined height to form a discharge space; A fluorescent layer formed in the discharge space; A plurality of display electrodes disposed on one surface of the second substrate opposite to the first substrate in a direction crossing the address electrodes; A second dielectric layer formed over the second substrate while covering the display electrodes; And Coating the second dielectric layer, the protective layer including MgO; The X-ray diffraction intensity for the (111) plane of the MgO is the X-ray diffraction intensity for the A, (220) plane and the X-ray diffraction intensity for the B, (200) plane is the C and (311) planes. Assuming that the X-ray diffraction intensity is D, the following condition is satisfied. A: (B + C + D) = 6: 4 to 10: 0 or (A + B): (C + D) = 8: 2 to 10: 0. According to claim 1, Wherein said X-ray diffraction intensity is measured using CuKα rays. According to claim 1, Wherein the MgO protective film is a plasma display panel is formed by plasma deposition under a water pressure condition of 1.0 X 10 ^-7 Torr to 7 X 10 ^-6 Torr. The method of claim 4, wherein The plasma deposition method is an ion plating method plasma display panel. According to claim 1, The X-ray diffraction intensity for the (111) plane of the MgO is the X-ray diffraction intensity for the A, (220) plane and the X-ray diffraction intensity for the B, (200) plane is the C and (311) planes. Assuming that the X-ray diffraction intensity is D, the following condition is satisfied. A: (B + C + D) = 6: 4 to 9: 1 or (A + B): (C + D) = 8: 2 to 9: 1:

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