KR100696538B1 - Plasma display panel without transparent electrodes - Google Patents

Abstract

A plasma display panel without transparent electrodes is provided to improve discharge stability and light emitting efficiency by controlling easily addressing and priming particles. A second substrate(20) is disposed in parallel to a first substrate(10). A barrier rib(15) is formed between the first and the second substrate in order to define a plurality of discharge cells. A plurality of first metal electrodes(11) are disposed between the first and the second substrate and are extended in parallel into one of the discharge cells. A plurality of second metal electrodes(12) are disposed between the first and the second substrate and are extended in parallel to the first metal electrodes within one of the discharge cells. An address electrode(18) is disposed between the first and the second substrate and is extended perpendicularly to the first and the second metal electrode. The total area of the second metal electrodes is larger than the total area of the first metal electrodes.

Description

Plasma display panel without transparent electrodes {Plasma display panel without transparent electrodes}

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 a first embodiment of the present invention.

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

5 to 7 are diagrams illustrating an electrode arrangement structure according to a third preferred embodiment of the present invention and a modification thereof.

8 is a view showing an electrode arrangement structure according to a modification of the first preferred embodiment of the present invention.

Brief description of symbols for the main parts of the drawings

11, 21, 31: first metal electrode 12, 22, 32: second metal electrode

11a, 21a, 31a: first discharge electrode on first metal electrode side

11b, 21b, 31b: second discharge electrode on first metal electrode side

11c, 21c, 31c: third discharge electrode on the first metal electrode side

11d, 21d, 31d: first connection electrode on the first metal electrode side

11e, 21e, 31e: second connection electrode on the first metal electrode side

12a, 22a, 32a: first discharge electrode on second metal electrode side

12b, 22b, 32b: second discharge electrode on second metal electrode side

12c, 22c, 32c: third discharge electrode on second metal electrode side

22d: fourth discharge electrode on the second metal electrode side

12d, 22e, 32d: first connection electrode on the second metal electrode side

12e, 22f, 32e: second connection electrode on the second metal electrode side

22g: third connection electrode on the second metal electrode side

15 bulkhead 16: discharge cell

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 having no transparent electrode, and more particularly to asymmetrical design of paired sustain electrodes in a sustain electrode pair composed of a plurality of discharge electrodes, thereby improving discharge stability and luminous efficiency. It relates to a plasma display panel that can be made.

 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 a first metal electrode and a second metal electrode are formed using only a bus electrode 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 first metal 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), and the second metal electrode 2 includes the first discharge electrode 2a, the second discharge electrode 2b, the third discharge electrode 2c, the first connection electrode 2d, and the second connection. The electrode 2e is provided.

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 first metal electrode 1 ) And when the driving voltage is alternately applied to the discharge space in the discharge cell 6 through the second metal electrode 2, the first metal electrode having the shortest discharge gap therebetween in the selected discharge cell 6. The discharge is started between the side first discharge electrode 1a and the second metal electrode side first discharge electrode 2a.

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

However, since the first metal electrode and the second metal electrode are disposed symmetrically in the discharge cell, addressing control of the second metal electrode between the first metal electrode and the second metal electrode and control of priming particles are not easy. There is a problem.

The present invention provides a plasma display panel which can improve discharge stability and luminous efficiency by modifying the shape of the scan electrode (Y electrode) so that wall charges can be easily collected on the scan electrode during discharge. Its purpose is to.

In order to achieve the above object and various other objects, the present invention is a first substrate; A second substrate spaced apart from and parallel to the first substrate; A partition wall partitioning a space between the first and second substrates into a plurality of discharge cells; A plurality of first metal electrodes disposed between the first and second substrates and extending in parallel to each other in a discharge cell; Disposed between the first and second substrates, extending in parallel with the first metal electrode at a predetermined interval in the discharge cell, and extending in parallel to each other in the discharge cell to facilitate address discharge in the discharge cell; A plurality of second metal electrodes; And an address electrode disposed between the first substrate and the second substrate, the address electrode extending in a direction orthogonal to a direction in which the first metal electrode and the second metal electrode extend.

Here, the widths of all the discharge electrodes of the second metal electrode are larger than the widths of the discharge electrodes of the first metal electrode. Alternatively, the number of discharge electrodes of the second metal electrode is larger than the number of discharge electrodes of the first metal electrode. Alternatively, the width of any one of the discharge electrodes of the second metal electrode is larger than the width of the other discharge electrode.

Among the discharge electrodes of the first metal electrode and the second metal electrode, the center portion of the discharge electrode of the first metal electrode and the discharge electrode of the second metal electrode which are closest to the center of the discharge cell are bent in a direction away from each other. There may be.

The first metal electrode and the second metal electrode may further include a first connection electrode connecting the discharge electrode of the first metal electrode and a second connection electrode connecting the discharge electrode of the second metal electrode, respectively. The center line of the connection electrodes may be positioned to be the same as the center line of the address electrode, or the same as the center line of the barrier rib.

The width of the connection electrode is preferably narrower than the width of the address 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.

The plasma display panel includes a first substrate 20, a second substrate 10, a partition wall, a first metal electrode 11, a second metal electrode 12, a first dielectric layer 13, a protective film 14, and an address electrode. (18), the second dielectric layer 17, and the phosphor layer 19 are 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 logic control unit (not shown) to the first metal electrode 11, It is applied to the second metal electrode 12 and the address electrode 18.

After the initial reset step and the wall charge formation step for each discharge cell 16, the first metal electrode 11 has a number of times proportional to the brightness of the screen in the discharge cell 16 selected to output an image at a specific time. And pulses are alternately applied to the second metal electrode 12. At this time, in the addressing step of forming wall charges, wall charges are easily collected in the second metal electrode part having an asymmetrical shape which is not the same as that of the first metal electrode part.

When a driving voltage is applied to the discharge space in the discharge cell through the first metal electrode 11 and the second metal electrode 12, the first metal is added to the wall charge formed in the first dielectric layer 13 in the addressing step. Since the voltage difference between the electrode 11 and the second metal electrode 12 is equal to or greater than the discharge start voltage, the first metal electrode side having the shortest discharge gap between the first metal electrode 11 and the second metal electrode 12. The discharge is started between the first discharge electrode 11a and the first discharge electrode 12a on the second metal electrode side. At this time, the wall charges formed on the second metal electrode 12 easily cause sustain discharge, thereby improving discharge stability and luminous efficiency.

The discharges disclosed are the second discharge electrodes 11b and 12b and the third discharge electrode 11c of each electrode connected by the first metal electrode side connection electrodes 11d and 11e and the second metal electrode side connection electrodes 12d and 12e. , 12c). 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 second substrate 10 and combines with visible light emitted from another discharge cell to produce an image.

The following describes the function and operation of each component.

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

The first substrate 20 is opposed to the second substrate 10 in parallel at a predetermined interval. The first substrate 10 and the second substrate 20 are spaced apart at a predetermined interval to face in parallel to form a discharge space, and the second substrate 20 uses a transparent glass material so that visible light passes therethrough.

However, the protection scope of the present invention is not limited thereto, and the first substrate 10 may be configured to be transparent, and the first substrate 10 and the second substrate 20 may be configured to be transparent at the same time. In addition, the first substrate 10 and the second substrate 20 of the present invention may be made of a semi-transparent material, it may be configured by embedding a color filter on the surface or inside.

Accordingly, as shown in the drawing, not only the reflective type but also the transmissive plasma display in which the visible light generated when the vacuum ultraviolet ray (VUV) emitted from the excited discharge gas strikes the phosphor layer 19 is reflected to the opposite side is also within the protection scope of the present invention. Will belong.

The partition wall 15 forms a discharge cell 16 partitioning a space between the second substrate 10 and the first substrate 20 so that a basic unit of an image can be formed, and a cross between the discharge cells 16 is formed. 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.

3 to 8 are views showing an electrode arrangement structure according to a preferred embodiment and modification of the present invention.

Instead of using the transparent electrode, the first metal electrode 11 should apply a sufficient driving voltage to the discharge space in the discharge cell through the bus electrode, so that the surface of the second substrate 10 on the surface of the discharge cell 16 in the direction of the discharge cell 16. And a first discharge electrode 11a, a second discharge electrode 12b, and a third discharge electrode 12c, which are disposed in parallel with each other in a direction orthogonal to the address electrode 18. 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. In this case, the widths of the first and second connection electrodes 11d and 11e are preferably narrower than the widths of the address electrodes 18.

The protection scope of the present invention is not limited thereto, and the first and second connection electrode portions 11d, 11e, 12d, and 12e are located on the partition wall 15 without being in the discharge cell. Of course, it includes only the electrode terminal (not shown) located at one end.

The first and second connection electrode portions 11d, 11e, 12d, and 12e diffuse the discharge initiated by the first discharge electrodes 11a and 12a to the second and third discharge electrodes 11b, 11c, 12b, and 12c. Not only does it play a role, it also plays a role of allowing voltage to be applied to the discharge electrodes in the other discharge cells of the part which are not disconnected through the connection electrode part formed for each discharge cell even if one of the discharge electrodes is disconnected. It is more preferable in view of the discharge stability that the second connection electrode portions 11d, 11e, 12d, 12e are positioned at each discharge cell than at the terminal portions of the first metal electrode and the second metal electrode.

Instead of using the transparent electrode, the second metal electrode 12 must apply a sufficient driving voltage to the discharge space in the discharge cell through the bus electrode, so that the second substrate 10 is directed toward the first substrate 20 side of the second substrate 10. And are spaced apart at regular intervals in a direction parallel to the first metal electrode 11 in the same discharge cell 16.

A first embodiment of the structure of the Y electrode is shown in FIG. Referring to the drawings, a first discharge electrode 12a, a second discharge electrode 12b, and a third discharge electrode 12c which are spaced apart from the first metal electrode 11 at a predetermined interval and extend in parallel to each other are 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.

Here, the widths of the first to third discharge electrodes 12a, 12b, and 12c are larger than the widths of the discharge electrodes 11a, 11b, and 11c of the first metal electrode.

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.

The protection scope of the present invention is not limited thereto, and the first and second connection electrode portions 11d, 11e, 12d, and 12e are located on the partition wall 15 without being in the discharge cell. Of course, it includes only located in the terminal portion (not shown).

A modification to the first embodiment of the structure of the X electrode 11 and the Y electrode 12 is shown in FIG. Referring to the drawings, a first discharge electrode 12a, a second discharge electrode 12b, and a third discharge electrode 12c which are spaced apart from the first metal electrode 11 at a predetermined interval and extend in parallel to each other are 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.

Here, the center portion of the first discharge electrode 11a of the first metal electrode and the first discharge electrode 12a of the second metal electrode in one discharge cell is bent in a direction away from each other. By forming such a curvature, the discharge gap in the portion where the discharge occurs most is long to increase the area where the discharge occurs, thereby improving the luminous efficiency.

The descriptions of the first and second connection electrode parts 21d and 21e are the same as those described in the first embodiment.

A second embodiment of the structure of the Y electrode 22 is shown in FIG. Referring to the drawings, the first discharge electrode 22a, the second discharge electrode 22b, the third discharge electrode 22c, and the fourth discharge electrode which are spaced apart from the first metal electrode 21 at a predetermined interval and extend in parallel to each other. 22d is provided. In addition, the first connection electrode 22e is used for the connection between the first discharge electrode 22a and the second discharge electrode 22b, and the connection is made between the second discharge electrode 22b and the third discharge electrode 22c. The third connection electrode 22g is interposed between the second connection electrode 22f and the third discharge electrode 22c and the fourth discharge electrode 22d.

That is, the number of discharge electrodes 22a, 22b, 22c, and 22d of the Y electrode is larger than the number of discharge electrodes 21a, 21b, and 21c of the X electrode, so that the first discharge electrode 22a of the Y electrode is made of the X electrode. The structure is located closer to the center portion of the discharge cell than the one discharge electrode 21a.

A third embodiment and modification thereof of the structure of the Y electrode 32 are shown in Figs. Referring to the drawings, a first discharge electrode 32a, a second discharge electrode 32b, and a third discharge electrode 32c which are spaced apart from the first metal electrode 31 at a predetermined interval and extend in parallel to each other are provided. In addition, the first connection electrode 32d is used for the connection between the first discharge electrode 32a and the second discharge electrode 32b, and the connection is made between the second discharge electrode 32b and the third discharge electrode 32c. The second connection electrode 32e is interposed.

Here, the width of the first discharge electrode 32a is larger than that of the other discharge electrodes. As a modification to this, the width of the third discharge electrode 32c is larger than the width of the other discharge electrodes 32a and 32b. As another modification, the width of the second discharge electrode 32b is larger than the width of the other discharge electrodes 32a and 32c.

In addition, the scope of protection of the present invention with respect to the above-described second and third embodiments and modifications thereof also includes modifications as shown in FIG. 8 as a modification of the first embodiment.

When the addressing voltage is applied to the second metal electrodes 12, 22, 32 and the address electrode 18 having the above structure, wall charges are generated, and the widths of the discharge electrodes of the second metal electrodes 12, 22, 32 are increased. A large number or a large number of wall charges are generated in the dielectric layer formed on the second metal electrode. Subsequently, when a driving voltage is applied to the discharge space in the discharge cell 16 through the first metal electrodes 11, 21, 31 and the second metal electrodes 12, 22, 32, the first metal electrodes 11, 21. 31 and the first metal discharge electrodes 11a, 21a, 31a on the first metal electrode side and the first metal discharge electrodes 12a on the second metal electrode side 12a having the shortest discharge gaps between the second metal electrodes 12, 22, and 32; Discharge is initiated between, 22a and 32a. Even at this time, the wall charges formed in the dielectric layer of the second metal electrode 12 make the sustain discharge easily, thereby improving the discharge stability.

The discharge initiated between the first metal electrode side first discharge electrodes 11a, 21a, 31a and the second metal electrode side first discharge electrodes 12a, 22a, 32a is the first metal electrode side first discharge. On the basis of the discharge between the electrodes 11a, 21a, 31a and the first discharge electrodes 12a, 22a, 32a on the second metal electrode side, it is diffused to the second discharge electrodes 11b, 21b, 31b and again discharged to the third discharge. It diffuses to the electrodes 11c, 21c, and 31c.

Therefore, the control of the addressing and priming particles (priming particles) can be easily controlled to facilitate the addressing, and furthermore, the sustain discharge occurs, thereby improving the discharge stability and luminous efficiency as a whole.

The first dielectric layer 13 is a dielectric layer used as an insulating film of the first metal electrode 11 and the second metal electrode 12, and uses a material having high insulation resistance and good light transmittance. 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. At this time, in particular, a lot of wall charges are formed around the second metal electrode 12.

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 first substrate 20 in the direction toward the second substrate 10 and crosses the first metal electrode 11 and the second metal electrode 12 at a predetermined angle. Extend in the direction. The address electrode 18 is used to determine the discharge cell in which the discharge should occur by generating a discharge between the second metal electrode 12 and generating 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.

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 having no transparent electrode according to the present invention, the width or number of the second metal electrodes including the plurality of discharge electrodes and the connecting electrodes is larger or larger than that of the first metal electrode.

Accordingly, wall charges can easily be collected in the dielectric layer of the second metal electrode during discharge, thereby facilitating control of addressing and priming particles, thereby improving discharge stability and luminous efficiency.

Claims (8)

A first substrate; A second substrate spaced apart from and parallel to the first substrate; A partition wall partitioning a space between the first and second substrates into a plurality of discharge cells; A plurality of first metal electrodes disposed between the first and second substrates and extending in parallel in one discharge cell;  A plurality of second metal electrodes disposed between the first and second substrates and extending in parallel with the first metal electrode at predetermined intervals in the one discharge cell; And An address electrode disposed between the first substrate and the second substrate, extending in a direction orthogonal to a direction in which the first metal electrode and the second metal electrode extend, and having an address electrode causing an address discharge with the second metal electrodes; , The sum of the areas of the second metal electrodes corresponding to the one discharge cell is larger than the sum of the areas of the first metal electrodes. According to claim 1, The number of the second metal electrodes corresponding to the one discharge cell is the same as the number of the first metal electrodes corresponding to the one discharge cell, and the width of each of the second metal electrodes is the width of each of the first metal electrodes. Larger than plasma display panel. According to claim 1, The number of the second metal electrodes corresponding to the one discharge cell is greater than the number of the first metal electrodes corresponding to the one discharge cell. According to claim 1, The number of the second metal electrodes corresponding to the one discharge cell is the same as the number of the first metal electrodes corresponding to the one discharge cell, and the width of the at least one second metal electrode is the width of the first metal electrode. Plasma display panel larger than width. The method according to any one of claims 1 to 4, And a central portion of the discharge electrodes closest to the center of the discharge cell among the first metal electrodes and the second metal electrodes is curved in a direction away from each other. The method according to any one of claims 1 to 4, The first and second metal electrodes may further include a first connection electrode connecting the first metal electrodes and a second connection electrode connecting the second metal electrodes, respectively. The method of claim 6, The center line of the first and second connection electrodes is positioned to be the same as the center line of the address electrode, and the width of the first and second connection electrodes is smaller than the width of the address electrode. The method of claim 6, The center line of the first and second connection electrodes is positioned to be the same as the center line of the partition wall.

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