KR20000004391A - Plasma display panel - Google Patents

Abstract

PURPOSE: A plasma display panel is provided to obtain high luminance and be operated by low voltage. CONSTITUTION: The plasma display panel comprises: a rear substrate(30); address electrodes(22) formed on the rear substrate, and which are disposed by two or more on a discharge cell; the first dielectric layer(24) applied on the rear substrate; separating walls(26) formed on the first dielectric layer and defining unit discharge cell; fluorescent substance(28) applied on the separating walls and the surface of the first dielectric layer between the walls; dummy electrodes(29) positioned on the fluorescent substance over the address electrodes; a front substrate(40); discharge sustaining electrodes(34) formed on the front substrate, and consisted transparent electrodes and bus electrodes; the second dielectric layer(36) applied on the front substrate; and a protective layer(38) applied on the second dielectric layer.

Description

Plasma display panel

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel capable of high luminance and low voltage driving.

Plasma Display Panel (PDP), which is one of the flat panel display devices, is composed of an array of discharge cells capable of independently discharging, and discharges each discharge cell independently according to an electrical signal applied from the outside. To reproduce the image.

Since the overall thickness of the PDP can be less than 1 cm, the thickness and weight of the PDP can be remarkably reduced compared to the CRT display device using an electron gun, and a wide viewing angle can be obtained compared to the liquid crystal display device. There is this.

In addition, the PDP has a structure in which a pair of glass substrates are bonded to each other through a barrier rib defining a discharge cell. In this case, a large display device can be easily manufactured by forming a wide gap between the barrier ribs. Have.

FIG. 1 is a view illustrating a unit discharge cell of a conventional AC PDP. As illustrated, the AC PDP includes a back substrate 10 having an address electrode 2 and a front surface having a discharge sustain electrode 14. The substrates 20 are bonded to face each other, and a discharge gas 30 such as argon (Ar), neon (Ne), or xenon (Xe) is sealed in the discharge space between the substrates 10 and 20. .

Here, the address electrode 2 and the first dielectric layer 4 covering the address electrode 2 are formed on the rear substrate 10, and the independent discharge spaces are defined on the first dielectric layer 4 and between the adjacent discharge spaces. Partition walls 6 are formed to prevent crosstalk of the phosphors, and phosphors 8 are coated between the partition walls 6.

Discharge holding electrodes 14 including transparent electrodes 11 and bus electrodes 12 are formed on the front substrate 20, and the discharge holding electrodes 14 are covered on the front substrate 20 to cover the discharge substrates 14. The second dielectric layer 16 is coated on its entire surface, and a protective layer 18 made of MgO having a high secondary electron emission coefficient is applied thereon.

At this time, although not shown, the discharge sustaining electrodes are formed in one discharge space, that is, one pair of discharge cells.

On the other hand, when the back substrate 10 and the front substrate 20 are bonded together, the address electrode 2 and the discharge sustaining electrode 14 are bonded to each other vertically and cross each other.

However, in the conventional PDP as described above, since the phosphor is coated on the planarized first dielectric layer, high luminance cannot be obtained due to the small coating area of the phosphor, and the discharge start voltage is very high.

Accordingly, an object of the present invention is to provide a PDP capable of high voltage and low voltage driving as well as to solve the above problems.

1 is a cross-sectional view showing a conventional AC plasma display panel.

2 is a cross-sectional view illustrating a method of manufacturing a back substrate of a plasma display panel according to an exemplary embodiment of the present invention.

3 is a cross-sectional view illustrating a method for manufacturing a front substrate of a plasma display panel according to an exemplary embodiment of the present invention.

4 is a sectional view showing a plasma display panel according to an embodiment of the present invention;

(Explanation of symbols for the main parts of the drawing)

22: address electrode 22a: first address electrode

22b: second address electrode 24: first dielectric layer

26: partition 28: phosphor

29 dummy electrode 30 back substrate

31: bus electrode 32: transparent electrode

32a: first bus electrode 32b: second bus electrode

34a: X electrode 34b: Y electrode

34: discharge sustain electrode 36: second dielectric layer

38: protective layer 40: front substrate

PDP of the present invention for achieving the above object, the back substrate; Address electrodes formed on the rear substrate and formed so that at least two or more are disposed in one discharge cell; A first dielectric layer coated on the rear substrate at a predetermined thickness along a surface thereof and surfaces of address electrodes; Barrier ribs formed on the first dielectric layer to define a unit discharge cell; A phosphor coated to a predetermined thickness along the surface of the partition wall and the first dielectric layer between the partition walls; A dummy electrode formed on the phosphor located above the address electrode; Front substrate; A discharge sustain electrode formed on the front substrate, the discharge sustain electrode comprising a transparent electrode and a bus electrode; A second dielectric layer coated on the front substrate with a predetermined thickness along its surface and the surface of the discharge sustaining electrode; And a protective layer applied on the second dielectric layer, wherein the back substrate and the front substrate are bonded to each other such that the address electrode and the discharge sustain electrode are vertically crossed at the same time as the electrode arrangement surfaces thereof face each other, and the discharge defined by the partition wall. The space is characterized in that the discharge gas is sealed.

According to the present invention, since the coating area of the phosphor is increased, the luminance can be improved, and since the distance between the address electrode and the discharge sustaining electrode is reduced, low voltage driving is possible.

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

2 is a cross-sectional view illustrating a method of manufacturing a lower substrate of a PDP according to an embodiment of the present invention. First, the silver (Ag) paste is printed two or three times on the back substrate 30 to address electrode. (22) is formed, and the first dielectric layer 24 is entirely coated on the back substrate 30 using glass paste to cover them.

Then, the phosphors 28 are formed on the first dielectric layer 24 between the partition surface and the partition walls in a state where the partition walls 26 for defining the unit discharge cells are formed in the upper portion of the first dielectric layer 24. Apply.

In the above, at least two or more, preferably two, address electrodes 22 are formed in one discharge cell, the shape of which is 50 to 60 µm in the lower width and 20 to 30 µm in the upper width. It is formed to have a 30 to 40㎛ about 2 times higher than conventional.

Accordingly, as shown in the drawing, the first dielectric layer 24 which is entirely coated with a predetermined thickness along the surfaces of the back substrate 30 and the first and second address electrodes 22a and 22b is different from the surface step. In addition, since the phosphor 28 applied on the first dielectric layer 24 is also applied along the surface of the first dielectric layer 24, the phosphor 28 has a surface step.

Therefore, since the luminance of the PDP is due to the amount of the phosphor applied, the area of the phosphor is increased compared with the conventional one, so that high luminance can be obtained when the PDP is driven.

Meanwhile, although not shown, the first and second address electrodes 22a and 22b disposed in one discharge cell are connected to each other at the terminal part, although not shown.

Subsequently, MgO having a high secondary electron emission coefficient is formed on the phosphor 28 positioned on the first address electrode 22a selected from the first and second address electrodes 22a and 22b disposed in one discharge cell. A dummy electrode 29 made of a metal film is formed.

3 is a cross-sectional view illustrating a method of manufacturing a front substrate according to an embodiment of the present invention. First, a discharge composed of an X electrode 34a and a Y electrode 34b by a known method on the front substrate 40 is shown. The sustain electrodes 34 are formed. At this time, the X electrode 14a and the Y electrode 34b are composed of a transparent electrode 31 made of an ITO metal film and a bus electrode 32 formed by printing a silver paste. In particular, in the case of the X electrode 34a The printing process of the silver paste is performed twice or three times so that the thickness of the first bus electrode 32a at the X electrode 34a is thicker than the thickness of the bus electrode 32b at the Y electrode 34b.

Thereafter, the second dielectric layer 36 is entirely coated on the front substrate 40 on which the discharge sustain electrodes 34 are formed along the surfaces of the front substrate 40 and the discharge sustain electrodes 34. On this top, a protective layer 38 made of a MgO metal film is formed.

4 is a cross-sectional view illustrating a PDP according to an embodiment of the present invention showing a state in which the back substrate and the front substrate are bonded together.

As shown, the back substrate 30 and the front substrate 40 are bonded to each other so that the address electrode 22 and the discharge sustain electrode 34 formed on one side thereof face each other vertically and cross each other. A discharge gas (not shown) is enclosed in the discharge cell defined by 36.

In the PDP of the present invention having such a structure, since the coating area of the phosphor 28 applied on the back substrate 30 is increased than before, the luminance can be improved.

In addition, since the height of the first address electrode 22a that participates in the discharge start has been increased, and the height of the first bus electrode 32a of the X electrode 34a has also increased, the electrodes 22a, Since the spacing between 34a is reduced by about 80 to 85% compared to the prior art, the dummy electrodes 29 made of MgO metal film having a large secondary electron emission coefficient are interposed between the electrodes 22a and 34a. The discharge start voltage is drastically reduced than before.

As described above, the present invention can increase the coating area of the phosphor by disposing at least two or more address electrodes in the unit discharge cell to generate a surface step on the rear substrate, thereby increasing the coating area of the phosphor Due to this, a high brightness PDP can be obtained.

In addition, by reducing the gap between the address electrode and the discharge sustaining electrode, a dummy electrode made of a MgO metal film having a high secondary electron emission coefficient may be further formed on the address electrode, thereby lowering the discharge start voltage. In addition, power consumption can be reduced due to being able to implement a PDP capable of driving a low voltage.

Meanwhile, although specific embodiments of the present invention have been described and illustrated, modifications and variations can be made by those skilled in the art. Accordingly, the following claims are to be understood as including all modifications and variations as long as they fall within the true spirit and scope of the present invention.

Claims (4)

Back substrate; Address electrodes formed on the rear substrate and formed so that at least two or more are disposed in one discharge cell; A first dielectric layer coated on the rear substrate at a predetermined thickness along a surface thereof and surfaces of address electrodes; Barrier ribs formed on the first dielectric layer to define a unit discharge cell; A phosphor coated to a predetermined thickness along the surface of the partition wall and the first dielectric layer between the partition walls; A dummy electrode formed on the phosphor located above the address electrode; Front substrate; A discharge sustain electrode formed on the front substrate, the discharge sustain electrode comprising a transparent electrode and a bus electrode; A second dielectric layer coated on the front substrate with a predetermined thickness along its surface and the surface of the discharge sustaining electrode; And a protective layer applied on the second dielectric layer, The rear substrate and the front substrate are bonded to each other such that the electrode arrangement surfaces thereof face each other so that the address electrode and the discharge sustain electrode are vertically and intersected, and the discharge gas is sealed in the discharge space defined by the partition wall. . The plasma display panel of claim 1, wherein the address electrode has a width of 50 to 60 µm in a lower width, a width of 20 to 30 µm in an upper portion, and a height of 30 to 40 µm in height. The plasma display panel of claim 1, wherein the dummy electrode is formed of an MgO metal film. The plasma display panel of claim 1, wherein the bus electrode of the X electrode is formed thicker than the bus electrode of the Y electrode.