KR100670307B1 - Plasma display panel - Google Patents

Abstract

The plasma display panel according to the present invention includes a front substrate and a rear substrate disposed to face each other, a front dielectric layer and a rear dielectric layer formed on the rear surface of the front substrate and the front surface of the rear substrate, and the front surface facing the rear substrate. The growth direction is inclined with respect to the back surface of the dielectric layer, and the peaks grown high from the back surface of the front dielectric layer and the valleys located between the top portions and lowered from the back surface of the front dielectric layer alternately appear. The protective layer formed on the front dielectric layer, the address electrodes spaced apart from each other in the rear dielectric layer, and the X electrodes spaced apart from each other and extending in a direction crossing the address electrodes, respectively, and disposed in the front dielectric layer. A pair of Y and Y electrodes And a plurality of supporting electrode pairs, a plurality of partition walls provided between the front substrate and the rear substrate and partitioning discharge cells in which discharge is performed, and phosphor layers disposed in the discharge cells. The average of the distances between each peak and its valleys and adjacent valleys is 14 nm to 24 nm. As a result, not only the brightness of the plasma display panel can be improved but also the discharge voltage for obtaining the same brightness can be reduced. In addition, the exhaust characteristics of the discharge gas can be improved to reduce erroneous discharge due to impurities.

Description

Plasma display panel {Plasma display panel}

1 is a partially separated perspective view showing an example of a conventional plasma display panel.

FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1.

FIG. 3 shows a rocking curve obtained through X-ray diffraction experiments of the protective layer shown in FIG. 1.

4 is a partially separated perspective view illustrating a plasma display panel according to an embodiment of the present invention.

FIG. 5 is a view schematically illustrating a growth direction of (1,1,1) of the protective layer crystal shown in FIG. 4.

FIG. 6 is a cross-sectional view taken along the line VI-VI of FIG. 4.

FIG. 7 shows a rocking curve obtained through X-ray diffraction experiments of the protective layer shown in FIG. 3.

<Description of the symbols for the main parts of the drawings>

10 front substrate 11 front dielectric layer

20 back substrate 21 back dielectric layer

22.Address electrode 30 ... Protective layer

32 ... Top 33 ... Bone

40 ... Holding electrode pair 41 ... X electrode

42 ... Y electrode 41a, 42a ... transparent electrode

41b, 42b bus electrode 50 bulkhead

51 Discharge cell 52 Phosphor layer

1, 100 ... plasma display panel 301 ... protective layer crystal

501 Vertical bulkhead 502 Vertical bulkhead

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel having an improved structure so that discharge characteristics can be improved.

In general, a plasma display panel is a flat panel display device that displays an image by using a gas discharge phenomenon, and is a thin flat panel display device that is thin in size and has a large viewing angle with a wide viewing angle. I am in the limelight. In such a plasma display panel, a discharge is generated in a discharge cell filled with a discharge gas by a direct current or an alternating voltage applied between electrodes, and ultraviolet rays emitted from the discharge gas excite a phosphor to emit visible light, thereby generating an image. Implement

Such a conventional plasma display panel is shown in FIG. Referring to FIG. 1, the conventional plasma display panel 1 includes a front substrate 80 and a rear substrate 90 disposed to face each other, a rear surface of the front substrate 80, and a front surface of the rear substrate 90. And discharged between the front dielectric layer 81 and the back dielectric layer 91 formed on the back dielectric, the address electrodes 92 disposed in the back dielectric layer 91, and the front substrate 80 and the back substrate 90, respectively. The discharge cell 93, the phosphor layer 94 disposed in the discharge cell 93, and the sustain electrode pairs 82 disposed on the front dielectric layer 81 are provided.

In addition, a protective layer 83 is formed on the rear surface of the front dielectric layer 81. The protective layer 83 has a (1,1,1) growth direction, and as shown in FIG. 2 through the deposition process, the (1,1,1) growth direction is formed on the rear surface of the front dielectric layer 81. It is formed perpendicular to these points can be seen through the rocking curve (Rocking curve) obtained by the X-ray diffraction experiment as shown in FIG.

On the other hand, the protective layer 83 protects the front dielectric layer 81 from the collision of electrons during the discharge of the plasma display panel 1, emits secondary electrons to lower the discharge voltage and when a constant discharge voltage is applied. Improve brightness.

Since the protective layer greatly affects the discharge characteristics of the plasma display panel, it is important to improve the plasma display panel performance by forming the protective layer optimally to improve the brightness of the plasma display panel and lower the discharge voltage. It is emerging.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a structure in which the discharge characteristics of the plasma display panel can be improved by increasing the secondary electron emission amount by forming the protective layer inclined with respect to the front dielectric layer. It is to provide an improved plasma display panel.

In order to achieve the above object, the plasma display panel according to the present invention, the front substrate and the rear substrate disposed to face each other, the front dielectric layer and back dielectric layer formed on the back surface of the front substrate and the front surface of the back substrate, respectively, The growth direction is inclined with respect to the back surface of the front dielectric layer facing the back substrate, and is located between the top portions grown high from the back surface of the front dielectric layer and between the top portions, and is grown low from the back surface of the front dielectric layer. A plurality of protective layers formed on the front dielectric layer, address electrodes disposed in parallel with each other in the rear dielectric layer, and the front substrate and the rear substrate are alternately provided so that the valley parts are alternately repeated. Partition walls for partitioning discharge cells to be performed, and the discharge cells And a sustain electrode pair disposed in the front dielectric layer and extending in a direction crossing each of the address electrodes and arranged in a pair of the X and Y electrodes spaced apart from each other, respectively. The average of the distances between each peak of the protective layer and the valleys adjacent to each peak is 14 nm to 24 nm.

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Further, according to the present invention, it is preferable that the growth direction of the protective layer forms an angle of 5 ° to 40 ° with an axis perpendicular to the rear surface of the front dielectric layer.

Further, according to the present invention, it is preferable that the growth direction of the protective layer forms an angle of 35 ° with an axis perpendicular to the rear surface of the front dielectric layer.

In addition, according to the present invention, the growth direction of the protective layer is preferably in the (1, 1, 1) direction.

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

4 is a partially separated perspective view illustrating a plasma display panel according to an embodiment of the present invention, FIG. 5 is a view schematically illustrating a growth direction of (1,1,1) of the protective layer crystal shown in FIG. 6 is a cross-sectional view taken along line VI-VI of FIG. 4, and FIG. 7 shows a rocking curve obtained through X-ray diffraction experiments of the protective layer shown in FIG. 3. For simplicity, the sustain electrode pair is omitted in FIG. 6.

4 to 7, the plasma display panel 100 according to the present embodiment includes a front substrate 10 and a back substrate 20, a front dielectric layer 11, a back dielectric layer 21, and a protective layer 30. And the address electrodes 22, the sustain electrode pairs 40, the partition walls 50, and the phosphor layer 52.

The front substrate 10 and the rear substrate 20 are disposed to face each other, and the front substrate 10 is formed of a transparent material such as glass that can transmit visible light so that an image is displayed.

The front dielectric layer 11 and the back dielectric layer 21 are formed on the back surface of the front substrate 10 and the front surface of the back substrate 20, respectively. The front dielectric layer 11 and back dielectric layer 21 are each made of a dielectric such as PbO, B ₂ O ₃ , SiO _2, and the like.

The protective layer 30 protects the front dielectric layer 11 from collision of charged particles accelerated during discharge, in particular during sustain discharge which displays the gray scale of the plasma display panel 100, and emits secondary electrons. Not only increases the discharge amount in the discharge cell 31 but also lowers the discharge voltage. The function of the protective layer 30 depends on the growth direction of the protective layer and the surface roughness of the protective layer, which can be seen through Table 1 based on data obtained through experiments.

The protective layer 30 is formed on the rear surface of the front dielectric layer 11 and is made of a material such as MgO. Vacuum equipment for forming the protective layer 30 includes an e-beam evaporator or a sputter. The growth direction of the protective layer 30 is inclined with respect to the rear surface of the front dielectric layer 11 facing the back substrate 20. The growth direction is inclined as shown in FIG. This can be seen from the rocking curve obtained by X-ray diffraction experiment. The growth direction of the protective layer 30 may vary as (1,0,0), (1,1,0). Since the protective layer 30 can be formed most densely under the same deposition conditions, it is easy to increase the surface roughness of the protective layer 30, and therefore, the growth of the protective layer 30 in the present embodiment. The direction is the (1,1,1) direction. The crystal 301 constituting the protective layer 30 has a cubic structure as shown in FIG. 5, and the (1,1,1) directions are as shown in FIG. 5.

The (1,1,1) growth direction of the protective layer 30 is inclined with respect to the rear surface of the front dielectric layer 11, and the inclination degree is the deposition temperature and the deposition in the deposition process of the protective layer 30. Not only by adjusting parameters such as speed, oxygen partial pressure, and roughness of the front dielectric layer 11, but also by adding fine grain or the like in the front dielectric 11. It is preferable that the angle ([Delta] [omega]) of the (1, 1, 1) growth direction of the protective layer 30 and the axis perpendicular to the back surface of the front dielectric layer 11 is 5 ° to 40 °, most preferably. Is 35 °, which can be seen from Table 1 on the basis of the data obtained through the experiment. In Table 1, the correlation between Δω, the surface roughness, and the luminance is shown numerically when the growth direction of the protective layer 30 is (1, 1, 1). When the Δω is greater than 45 °, the quality of the protective layer 30 is deteriorated, so that the electric field concentration surface is reduced, and as a result, as shown in Table 1, the luminance is lowered, and the low-grown portion of the protective layer 30 is too large. It is not preferable because it becomes thin and the life thereof is shortened. Further, when Δω is smaller than 3 °, the luminance characteristic is not greatly improved as shown in Table 1, which is not preferable.

The protective layer 30 has a plurality of tops 32 and a plurality of valleys 33, and the tops 32 and the valleys 33 are alternately repeated as shown in FIG. 6. The top portion 32 is a portion grown high from the rear surface of the front dielectric layer 11. The valley 33 is located between the top portions 32 and is a low growth portion from the rear surface of the front dielectric layer 11. The surface roughness of the protective layer 30, that is, the average of the distances between each peak 32 of the protective layer 30 and the valleys 33 adjacent to each peak 32 is 14 nm to 24. It is preferably nm, most preferably 24 nm. When the surface roughness is greater than 24 nm, the quality of the protective layer 30 is deteriorated, so that the electric field concentration surface is reduced, thereby lowering the luminance as shown in Table 1, as well as the valleys 33 of the protective layer 30. It is not preferable because it becomes so thin that its life is shortened. Further, when the surface roughness is smaller than 14 nm, the luminance characteristic is not greatly improved as shown in Table 1, which is not preferable.

Δω (°) Surface roughness (nm) Luminance (㏅ / ㎡) 0 7 140 3 10 145 5 14 152 10 17 155 15 16 157 20 18 158 25 19 158 30 22 162 35 24 166 40 24 165 45 23 163 50 20 159 55 14 153

The address electrodes 22 are arranged side by side to be spaced apart from each other on the back substrate 20, and have a stripe shape. The address electrodes 22 are covered by the back dielectric layer 21 and buried therein, and a partition 50 is formed between the address electrodes 22 on the top of the back dielectric layer 21. The barrier rib 50 includes a plurality of horizontal barrier ribs 501 arranged in parallel with the address electrode 22, and a plurality of vertical barrier ribs 502 arranged in parallel with each other and intersecting with the horizontal barrier ribs 501.

The plurality of sustain electrode pairs 40 are arranged on a surface of the front substrate 10 facing the rear substrate 20. Each of the sustain electrode pairs 40 extends in a direction crossing the address electrodes 22 and is disposed in the front dielectric layer 11. The sustain electrode pair 40 may be composed of an X electrode 41 and a Y electrode 42 spaced apart from each other, and the X electrode 41 and the Y electrode 42 may serve as a common electrode and a scan electrode, respectively.

The X electrode 41 and the Y electrode 42 include transparent electrodes 41a and 42a and bus electrodes 41b and 42b connected to one side of the transparent electrodes 41a and 42a. . The transparent electrodes 41a and 42a are formed of indium tin oxide (ITO), which is a transparent conductor in order to transmit visible light. In addition, the bus electrodes 41b and 42b apply voltages to the transparent electrodes 41a and 42a, respectively, and the electrical resistance of the transparent electrodes 41a and 42a formed of ITO having relatively low electrical conductivity. In order to improve the resistance, the conductive layer is formed of a metal having excellent conductivity such as silver (Ag) or copper (Cu).

The X electrode 41 includes spaced apart transparent electrodes 41a disposed for each discharge cell 51 and bus electrodes 41b connected to one side of the transparent electrodes 41a. Similarly, the Y electrode 42 is also spaced apart from each other, the transparent electrodes 42a and the transparent electrodes 42a disposed in the discharge cells 31 and the transparent electrodes 41a of the X electrode 41, respectively, and the transparent electrodes 42a. The bus electrode 42b connected to one side of the field is provided. The bus electrodes 41b 42b extend in directions crossing the address electrodes 22, respectively, and are disposed in discharge cells 51 arranged in a direction orthogonal to the direction in which the address electrodes 22 extend. The transparent electrodes 41a 42a are all connected.

The partition wall 50 partitions the discharge cell 51. The discharge cells 51 are partitioned by the partition walls 50 and are provided between the front substrate 10 and the rear substrate 20. The discharge is generated inside the discharge cell 51 to implement an image. In the present embodiment, the discharge cells 51 are formed by the horizontal partition wall 501 and the vertical partition wall 502 and have a rectangular parallelepiped shape.

The phosphor layer 52 is disposed in each of the discharge cells 51. The phosphor layer 52 is formed on the inner surface of the barrier rib 50 and the upper surface of the back dielectric layer 21 surrounded by the barrier rib 50. The color of the phosphor layer 52 is roughly divided into red, green, and blue to realize an image. Each discharge cell 51 is filled with a discharge gas mixed with neon (Ne), xenon (Xe), and the like, and the phosphor layer 52 emits visible light by being excited by ultraviolet rays generated during discharge.

Hereinafter, the function of the protective film 30 of the plasma display panel 100 of the present embodiment configured as described above will be described.

As described above, the protective layer is grown in the (1,1,1) direction, and the (1,1,1) growth direction of the protective layer is 5 ° to 40 ° with respect to the axis perpendicular to the back surface of the front dielectric layer. An average of the distances between the peaks and valleys of the protective layer is 14 nm to 24 nm. When the discharge test is performed on the plasma display panel including the protective layer, the discharge characteristics of the plasma display panel can be analyzed through Table 1 described above.

Since the protective layer is inclined with respect to the rear surface of the front dielectric layer, the top and the valleys are alternately formed to form a nonuniformity. The nonuniformity of the protective film concentrates an electric field and increases the collision area of charged particles for secondary electron emission. It will increase the total amount. As shown in Table 1, when Δω is increased, it can be seen that the emission amount of secondary electrons is increased to improve luminance. In addition, since the emission amount of the secondary electrons increases, it is possible to lower the discharge voltage in order to obtain the same brightness. In addition, when the protective layer is grown in the (1,1,1) direction, the protective layer is not only densely grown but also it is easy to increase the surface roughness of the protective layer than when it is grown in the other direction. It is most preferable to grow in the 1,1,1) direction. However, when Δω is increased by more than 40 °, the quality of the protective layer is deteriorated, so that the electric field concentration surface is reduced, thereby reducing the luminance, and the valleys of the protective layer are formed too low with respect to the back surface of the front dielectric layer. This shortening problem occurs and is not preferable. Considering such a situation, Δω is preferably in the range of 5 ° to 40 °, most preferably 30 ° as can be seen from Table 1. For the same reason, the surface roughness of the protective layer is preferably in the range of 14 nm to 24 nm.

In addition, since the protective layer is inclined with respect to the front side dielectric layer, the exhaust characteristics of the discharge gas can be improved to reduce erroneous discharge due to impurities.

Meanwhile, the plasma display panel 100 may manufacture several plasma display panels at one time through a multifaceted process, or may manufacture one plasma display panel at a time through one chamfering process, and the plasma display according to the present invention. The panel can be applied to any of the multi-sided or single-sided processes.

According to the present invention having the above-described configuration, since the nonuniformity of the protective layer concentrates the electric field and increases the collision area of the charged particles for secondary electron emission, thereby increasing the discharge amount, thereby improving the brightness of the plasma display panel. In addition, it is possible to lower the discharge voltage for obtaining the same brightness.

In addition, the exhaust characteristics of the discharge gas can be improved to reduce erroneous discharge due to impurities.

Although the present invention has been described in detail with reference to preferred embodiments, the present invention is not limited to the above embodiments, and many modifications can be made by those skilled in the art within the technical idea of the present invention. It is obvious.

Claims (5)

A front substrate and a rear substrate disposed to face each other; A front dielectric layer and a back dielectric layer formed on the back surface of the front substrate and the front surface of the back substrate, respectively; The growth direction is inclined with respect to the back surface of the front dielectric layer facing the back substrate, and is grown between the top portions grown from the back surface of the front dielectric layer and the top portions and grows low from the back surface of the front dielectric layer. A protective layer formed on the front dielectric layer so that the valleys alternately appear alternately; Address electrodes spaced apart from each other in the rear dielectric layer; Sustain electrode pairs extending in a direction crossing each of the address electrodes and disposed in the front dielectric layer, and provided with a pair of X electrodes and Y electrodes spaced apart from each other; A partition wall provided between the front substrate and the rear substrate and partitioning a discharge cell in which discharge is performed; And A phosphor layer disposed in each of the discharge cells; And the average of the distances between each peak of the protective layer and valleys adjacent to each peak is between 14 nm and 24 nm. delete The method of claim 1, And a growth direction of the protective layer forms an angle of 5 ° to 40 ° with an axis perpendicular to the rear surface of the front dielectric layer. The method of claim 3, wherein And the growth direction of the protective layer forms an angle of 35 ° with an axis perpendicular to the rear surface of the front dielectric layer. The method according to any one of claims 1, 3 and 4, The growth direction of the protective layer is a plasma display panel, characterized in that (1, 1, 1) direction.

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