KR100647696B1 - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to enhance discharge efficiency by increasing a discharge path in a discharge gap between a first discharge electrode of an X electrode and a first discharge electrode of a Y electrode. A front substrate(10) is formed of a transparent material. A rear substrate(20) is separated from the front substrate and is positioned in parallel with the front substrate. A barrier rib(15) is formed in a space between the front and the rear substrate in order to define discharge cells(16). An X electrode(11) is arranged on a surface of the front substrate and includes at least two discharge electrodes(11a,11b,11c). A Y electrode(12) is arranged on the surface of the front substrate and includes at least two discharge electrodes(12a,12b,12c). A first dielectric layer(13) is formed on the surface of the front substrate in order to cover the X and Y electrodes. A protective layer(14) is formed on a surface of the first dielectric layer. An address electrode(18) is arranged on a surface of the rear substrate. A second dielectric layer(17) is formed on a surface of the rear substrate in order to cover the address electrode. A phosphor layer(19) is formed on the second dielectric layer and the barrier rib of the discharge cells.

Description

Plasma display panel {Plasma display panel}

1 is a view showing an electrode arrangement of a conventional ITO-less plasma display panel.

2 is an exploded perspective view schematically illustrating a plasma display panel having an electrode arrangement structure according to an exemplary embodiment of the present invention.

3 is a view showing an electrode arrangement structure according to an embodiment of the present invention.

Brief description of symbols for the main parts of the drawings

1, 11: X electrode 2, 12: Y electrode

1a, 11a: X electrode side first discharge electrode

1b, 11b: second discharge electrode on the X electrode side

1c and 11c: Third discharge electrode on the X electrode side

1d and 11d: X electrode side first connection electrode

1e, 11e: second connection electrode on the X electrode side

2a, 12a: first discharge electrode on the Y electrode side

2b, 12b: second discharge electrode on Y electrode side

2c, 12c: third discharge electrode on Y electrode side

2d, 12d: Y connecting electrode first connecting electrode

2e, 12e: second connection electrode on the Y electrode side

5, 15: partition 6, 16: discharge cell

8, 18: address electrode 10: front substrate

13: first dielectric layer 14: protective film

17: second dielectric layer 19: phosphor layer

20: back substrate

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel having an ITO-less bus electrode structure designed to have sufficient light emission by having a longer discharge path.

Plasma display device is a process of encapsulating a discharge gas between the two substrates of the plasma display panel having a plurality of electrodes and applying a discharge voltage to generate a vacuum ultraviolet light by the discharge, and exciting the phosphor formed by the vacuum ultraviolet light in a predetermined pattern A device that displays a desired image using visible light generated by the. Plasma display devices have been spotlighted as large-scale flat panel display devices because they can be thinned and can realize high-quality large screens having a wide viewing angle.

In a plasma display panel having a transparent electrode, the transparent electrode plays a role of applying a driving voltage to a discharge space in each discharge cell. Since the transparent electrode is disposed on the front substrate, a material such as indium tin oxide (ITO) of transparent material is used in order to pass more visible light emitted from the discharge cell and passing through the front panel. Since the transparent electrode generally has a large electrical resistance and a large voltage drop, it is difficult to apply a constant driving voltage to all the discharge cells, and since a large amount of driving power is consumed, it is necessary to supplement the low electrical conductivity of the transparent electrode. Bus electrodes with high electrical conductivity are used.

However, in the manufacturing process of the plasma display panel, the transparent electrode is not used due to the high material price of the transparent electrode, as well as the increase in manufacturing time and cost, which are required to pass the transparent electrode forming process and the bus electrode forming process separately. An ITO-less plasma display panel in which X electrodes and Y electrodes are formed using only bus electrodes is disclosed in Korean Patent Registration No. 0366101.

1 is a view showing an electrode arrangement of a conventional ITO-less plasma display panel. Referring to the drawings, the X electrode 1 includes a first discharge electrode 1a, a second discharge electrode 1b, a third discharge electrode 1c, a first connection electrode 1d and a second connection electrode 1e. The Y electrode 2 includes a first discharge electrode 2a, a second discharge electrode 2b, a third discharge electrode 2c, a first connection electrode 2d and a second connection electrode 2e. Equipped with.

First, all the discharge cells 6 are reset, and the discharge cells 6 to display an image are selected using the address electrode 8 according to a control signal for outputting a desired video signal, and then the X electrode 1 and When the driving voltage is alternately applied to the discharge space in the discharge cell 6 through the Y electrode 2, the first discharge electrode (X electrode side) having the shortest discharge gap between the selected discharge cells 6 is formed. The discharge is started between 1a) and the first discharge electrode 2a on the Y electrode side.

The discharge initiated between the X electrode side first discharge electrode 1a and the Y electrode side first discharge electrode 2a is between the X electrode side first discharge electrode 1a and the Y electrode side first discharge electrode 2a. On the basis of the discharge of the light source, it diffuses to the second discharge electrodes 1b and 2b and then to the third discharge electrodes 1c and 2c.

At this time, the discharge is mainly along the discharge electrodes 1a, 1b, 1c, 2a, 2b, and 2c, in particular, between the X electrode side first discharge electrode 1a and the Y electrode side first discharge electrode 2a. The most light emission occurs in the discharge gap of, the length of the partition wall in the transverse direction, that is, the discharge path is short enough that the discharge area that the discharge is most active is not sufficiently secured, the light emission is not maximized, the discharge efficiency is low.

In addition, when the area of the bus electrode is enlarged, the transmittance of the front panel of the visible light is reduced. On the contrary, when the area of the bus electrode is too narrow considering only the transmittance of the visible light, the driving voltage is not properly applied to the discharge space to ensure stable discharge. This makes it difficult to properly determine the width of the bus electrodes.

The present invention is to solve the above problems, by forming the bus electrode parallel to the direction in which the bus electrode extends in an oblique direction at a predetermined angle to increase the discharge path in the discharge gap to maximize the light emission efficiency It is an object of the present invention to provide a plasma display device that can be improved.

In order to achieve the above object and various other objects, the present invention is a transparent front substrate; A rear substrate spaced apart from and parallel to the front substrate; Barrier ribs forming a discharge cell for partitioning a space between the front substrate and the rear substrate; An X electrode disposed on a surface of the front substrate and having at least two discharge electrodes extending in parallel with each other in an oblique direction with a predetermined angle with respect to the extending direction; A Y electrode disposed on a surface of the front substrate and spaced apart at a predetermined interval in a direction parallel to the X electrode in the same discharge cell and having at least two discharge electrodes extending in parallel to each other; A first dielectric layer applied to a surface of the front substrate to cover the X and Y electrodes; A protective film formed on the surface of the dielectric layer; An address electrode disposed on a surface of the rear substrate and extending in a direction crossing the direction in which the X electrode and the Y electrode extend; A second dielectric layer coated on a surface of the back substrate to cover the address electrode; The second dielectric layer; And a plasma display panel on the partition wall of the discharge cell.

Here, in order to have a longer discharge gap, the center portion of the discharge electrode of the X electrode and the discharge electrode of the Y electrode closest to the center of the discharge cell of the discharge electrodes of the X electrode and the Y electrode is It is preferable that the bending is formed in a direction away from each other.

Further, the X electrode and the Y electrode in the discharge cell, the X electrode and the Y electrode in the neighboring discharge cell centered on the partition wall between the discharge cell and the adjacent discharge cell in the direction in which the X electrode and the Y electrode extend. It is preferable that it is formed so that it may become symmetric with respect to.

The X electrode and the Y electrode may further include a connection electrode connecting between the X electrode side discharge electrode and at least one connection electrode connecting the Y electrode side discharge electrode in one discharge cell, respectively. Preferably, the connection electrode connects a central portion of each discharge electrode.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail. 2 is an exploded perspective view schematically illustrating a plasma display panel having an electrode arrangement structure according to an exemplary embodiment of the present invention, and FIG. 3 is a view illustrating an electrode arrangement structure according to an exemplary embodiment of the present invention.

The plasma display panel includes a front substrate, a back substrate, a partition wall, an X electrode 11, a Y electrode 12, a first dielectric layer 13, a passivation layer 14, an address electrode 18, a second dielectric layer 17, and a phosphor. The layer 19 is provided.

Looking at the overall function by the above configuration, the image signal received from the outside is converted into a signal for outputting the desired image through the image processing unit (not shown) and the logic control unit (not shown) X electrode 11, Y electrode 12 and to the address electrode 18.

After each of the discharge cells 16 undergoes an initial reset step and a wall charge forming step, the discharge cells 16 selected to output an image at a specific time are X electrodes 11 and Y as many times as proportional to the brightness of the screen. Alternately pulses are applied to the electrodes 12.

When a driving voltage is applied to the discharge space in the discharge cell through the X electrode 11 and the Y electrode 12, the X electrode 11 and the Y electrode are added to the wall charges formed in the first dielectric layer 13 in the addressing step. The voltage difference between the electrodes 12 becomes equal to or higher than the discharge start voltage, so that the X electrode side first discharge electrode 11a and the Y electrode side first discharge electrode having the shortest discharge gap between the X electrode 11 and the Y electrode 12. The discharge is started between 12a.

The disclosed discharges are connected to the second discharge electrodes 11b and 12b and the third discharge electrodes 11c and 12c of each electrode connected by the X electrode side connection electrodes 11d and 11e and the Y electrode side connection electrodes 12d and 12e. Spread out Due to the electric field formed at this time, plasma discharge occurs while electric charges collide with the discharge gas particles in the discharge cell 16, and as a result, vacuum ultra-violet is generated.

The vacuum ultraviolet rays are absorbed by the phosphor 19 coated on the side and bottom of the partition wall 15 to emit visible light while the excited electrons are stabilized again. The emitted visible light passes through the transparent front substrate 10 and is combined with the visible light emitted from another discharge cell to produce an image.

The following describes the function and operation of each component.

The front substrate 10 is made of a transparent material to allow visible light to pass therethrough.

The rear substrate 20 faces the front substrate 10 in parallel at a predetermined interval apart.

The partition wall 15 forms a discharge cell 16 that partitions a space between the front substrate 10 and the back substrate 20 so that a basic unit of an image can be formed, and cross talk between the discharge cells 16 ( It is responsible for preventing cross talk. In an embodiment of the present invention, a partition having a rectangular cross section is disclosed, but the present invention is not limited thereto and includes a partition having a polygonal structure such as a hexagon or an octagon or a cross section having a circular or elliptical shape.

Since the X electrode 11 should not apply a transparent electrode and a sufficient driving voltage must be applied to the discharge space in the discharge cell through the bus electrode, the X electrode 11 is disposed on the surface of the front substrate 10 in the direction of the rear substrate 20. And a first discharge electrode 11a, a second discharge electrode 12b, and a third discharge electrode 12c extending parallel to each other in an oblique direction at an acute angle with the direction in which the bus electrode extends. In addition, the first connection electrode part 11d connects the connection between the second discharge electrode 11b and the third discharge electrode 11c to connect the first discharge electrode 11a and the second discharge electrode 11b. The second connection electrode part 11e is interposed therebetween.

One end of the first connection electrode 11d is connected to the center of the first discharge electrode 11a, and the other end of the first connection electrode 11d is connected to the center of the second discharge electrode 11b. Similarly, one end of the second connection electrode 11e is connected to the center of the second discharge electrode 11b, and the other end of the second connection electrode 11e is connected to the center of the third discharge electrode 11c. have.

Since the Y electrode 12 must apply a sufficient driving voltage to the discharge space in the discharge cell through the bus electrode instead of the transparent electrode, the Y electrode 12 is disposed on the surface of the front substrate 10 toward the rear substrate 20 side. In the same discharge cell 16, they are spaced apart at regular intervals in a direction parallel to the X electrode 11. Thus, like the X electrode 11, the first discharge electrode 12a, the second discharge electrode 12b, and the third discharge electrode 12c extending in parallel with each other in an oblique direction at an acute angle with the direction in which the bus electrode extends. It is provided. In addition, the first connection electrode 12d is used for the connection between the first discharge electrode 12a and the second discharge electrode 12b, and the connection is made between the second discharge electrode 12b and the third discharge electrode 12c. The second connection electrode 12e is interposed.

One end of the first connection electrode 12d is connected to the center of the first discharge electrode 12a, and the other end of the first connection electrode 12d is connected to the center of the second discharge electrode 12b. Similarly, one end of the second connection electrode 12e is connected to the center of the second discharge electrode 12b, and the other end of the second connection electrode 12e is connected to the center of the third discharge electrode 12c. have.

Here, in order to improve the discharge efficiency, the center portion of the first discharge electrode 11a of the X electrode 11 and the center portion of the first discharge electrode 12a of the Y electrode side are bent in opposite directions to increase the discharge gap. It is preferable. In addition, the widths of the third discharge electrodes 11c and 12c are preferably larger than the widths of the first discharge electrodes 11a and 12a and the second discharge electrodes 11b and 12b. However, the width of each of the discharge electrodes 11a, 11b, 11c, 12a, 12b, and 12c and the shape of the bending of the first discharge electrodes 11a and 12a are not limited to those shown in the present invention, and are easily changed by those skilled in the art. Of course, it also includes the shape of the range that can be added.

In addition, the scope of protection of the present invention with respect to the number and position of the discharge electrode and the connection electrode is not limited to those shown in the drawings and includes those that can be easily changed, added, or deleted by those skilled in the art.

When a driving voltage is applied to the discharge space in the discharge cell 16 through the X electrode 11 and the Y electrode 12 having such a component, the discharge gap between the X electrode 11 and the Y electrode 12 is mutually different. The discharge is started between the shortest X electrode side first discharge electrode 11a and the Y electrode side first discharge electrode 12a.

The discharge initiated between the X electrode side first discharge electrode 11a and the Y electrode side first discharge electrode 12a is between the X electrode side first discharge electrode 11a and the Y electrode side first discharge electrode 12a. On the basis of the discharge of the light source, it diffuses to the second discharge electrode 11b and then to the third discharge electrode 11c.

That is, in the discharge between the X electrode 11 and the Y electrode 12, the most light emission occurs in the discharge gap between the X electrode side first discharge electrode 11a and the Y electrode side first discharge electrode 12a. .

Accordingly, the X electrode side first discharge is disposed by arranging the X electrode side first discharge electrode 11a and the Y electrode side first discharge electrode 12a in an oblique direction with the direction in which the bus electrodes 11 and 12 extend. The discharge path of the discharge gap between the electrode 11a and the first discharge electrode 12a on the Y electrode side can be formed longer than in the conventional structure, thereby maximizing light emission and improving discharge efficiency.

Here, as the angle formed with the direction in which the bus electrodes 11 and 12 extend, the discharge path including the discharge gap becomes longer, thereby maximizing light emission, but the size of the component used increases. Therefore, the inclination angle is preferably appropriately determined in consideration of the discharge efficiency, the driving voltage and the component material cost.

Further, the X electrode side second and third discharge electrodes 11b and 11c are parallel to the X electrode side first discharge electrode 11a, and the Y electrode side second and third discharge electrodes 12b and 12c are Y. It is arrange | positioned at an oblique direction so that it may be parallel to the electrode side 1st discharge electrode 11a. Therefore, the discharge path of the discharge gap can be formed longer than that of the conventional electrode arrangement structure, which is not arranged obliquely, thereby maximizing light emission, thereby improving the discharge efficiency.

The X electrode 11 and the Y electrode 12 in one discharge cell 16 are connected to the X electrode 11 and Y electrode 12 in the discharge cell 16 adjacent to each other in a direction perpendicular to the address electrode 18. It is preferable to arrange | position obliquely in the direction symmetrical to the partition wall between and adjacent discharge cells. That is, the bus electrodes 11 and 12 are formed in the wave direction with respect to the extension line extending.

According to an exemplary embodiment of the present invention, the directions of the angles at which the bus electrodes 11 and 12 are formed in the adjacent discharge cells 16 are alternately changed, but the present invention is not limited thereto. And a bending point at which the angle of the Y electrode 12 is changed is not formed on the partition wall.

The first dielectric layer 13 is a dielectric layer used as the insulating film of the X electrode 11 and the Y electrode 12, and a material having high insulation resistance and good light transmittance is used. Some of the charges generated by the discharge are attracted by the electric attraction due to the polarity of the voltage applied to each electrode, and are accumulated in the vicinity of the first dielectric layer 13) (with a protective film therebetween) to form wall charges.

The protective film 14 protects the first dielectric layer 13 and facilitates discharge by increasing the emission of secondary electrons during discharge. The protective film 14 is formed using a material such as magnesium oxide (MgO).

The address electrode 18 is disposed on the surface of the rear substrate 20 in the direction toward the front substrate 10 and extends in a direction crossing the X electrode 11 and the Y electrode 12 at a predetermined angle. The address electrode 18 is used to determine a discharge cell in which the discharge should occur by causing a discharge between the Y electrode 12 to generate a wall charge to display a predetermined image.

The second dielectric layer 17 is a dielectric layer used as an insulating film of the address electrode 18 and uses a material having high insulation resistance. Unlike the first dielectric layer 13, since the second dielectric layer 17 does not participate in the transmission of visible light, a material having good light transmittance is not required.

In the phosphor layer 19, a photo luminescence light emitting mechanism that emits visible light when the electrons excited by the vacuum ultraviolet rays generated by the discharge are absorbed again becomes stable. The phosphor layer 19 may include a red light emitting phosphor layer, a green light emitting phosphor layer, and a blue light emitting phosphor layer in order to enable the plasma display panel to realize a color image. The phosphor layer 19 may include a red light emitting phosphor layer, a green light emitting phosphor layer, and a blue light emitting layer. The phosphor layer may be disposed inside the discharge cell to form a unit pixel. Examples of the red light emitting phosphor include (Y, Gd) BO3: Eu3 +, examples of the green light emitting phosphor include Zn2Si04: Mn2 +, and examples of the blue light emitting phosphor include BaMgAl10O17: Eu2 +.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

According to the plasma display panel according to the present invention, a bus electrode structure including a first discharge electrode, a second discharge electrode, and a third discharge electrode extending in parallel to each other in an oblique direction at a predetermined angle with an extending direction is provided. have.

Accordingly, by increasing the discharge path in the discharge gap between the first discharge electrode on the X electrode side and the first discharge electrode on the Y electrode 12 side, light emission can be maximized to increase discharge efficiency.

In addition, even between the first discharge electrode and the second discharge electrode and between the second discharge electrode and the third discharge electrode, by increasing the discharge path in the discharge gap it is possible to maximize the light emission to increase the discharge efficiency.

Claims (5)

Transparent front substrate; A rear substrate spaced apart from and parallel to the front substrate; Barrier ribs forming a discharge cell for partitioning a space between the front substrate and the rear substrate; An X electrode disposed on a surface of the front substrate and having at least two discharge electrodes extending in parallel with each other in an oblique direction with a predetermined angle with respect to the extending direction; A Y electrode disposed on a surface of the front substrate and spaced apart at a predetermined interval in a direction parallel to the X electrode in the same discharge cell and having at least two discharge electrodes extending in parallel to each other; A first dielectric layer applied to a surface of the front substrate to cover the X and Y electrodes; A protective film formed on the surface of the dielectric layer; An address electrode disposed on a surface of the rear substrate and extending in a direction crossing the direction in which the X electrode and the Y electrode extend; A second dielectric layer coated on a surface of the back substrate to cover the address electrode; And a phosphor layer coated on the second dielectric layer and the partition wall of the discharge cell. The method of claim 1, In order to have a longer discharge gap, the discharge electrode of the X electrode and the central portion of the discharge electrode of the Y electrode that are closest to each other from the center of the discharge cell among the discharge electrodes of the X electrode and the Y electrode are separated from each other. A plasma display panel in which the curvature is formed in a direction. The method of claim 1, The X electrode and the Y electrode in one discharge cell are X and Y electrodes in the neighboring discharge cell centered on a partition wall between the discharge cell and the neighboring discharge cell in a direction in which the X electrode and the Y electrode extend. And a plasma display panel formed to be symmetrical with the plasma display panel. The method of claim 1, The X and Y electrodes each further include a connection electrode connecting between the discharge electrodes of the X electrode and at least one connection electrode connecting the discharge electrodes of the Y electrode in one discharge cell. . The method of claim 4, wherein And the connection electrode is formed to connect a central portion of each discharge electrode.

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