KR20050036250A - Plasma display panel having improved arranging structure of pixel - Google Patents

Abstract

The present invention is to improve the voltage stabilization and to improve the address voltage margin by equalizing the electrical characteristics of each address electrode, the first and second substrates facing each other to form a discharge space, and provided in the first substrate A plurality of scan electrodes provided on the second substrate, a plurality of address electrodes provided on the second substrate to generate an address discharge, and a partition wall partitioning the discharge space into a plurality of discharge cells coated with a phosphor inside; The panel relates to a plasma display panel, wherein discharge cells of at least two colors are arranged along a direction in which any one of the address electrodes extends.

Description

Plasma display panel having improved arranging structure of pixel}

The present invention relates to a plasma display panel (PDP), and more particularly, to a plasma display panel having an improved pixel array structure.

In general, a plasma display panel is used to display an image using a gas discharge phenomenon, and is excellent in various display capabilities such as display capacity, brightness, contrast, afterimage, viewing angle, and the like. I am getting it. In such a plasma display panel, a discharge is generated in a gas between the electrodes by a direct current or an alternating voltage applied to the electrode, and the phosphor emits light by exciting the phosphor by radiation of ultraviolet rays.

The plasma display panel may be divided into an alternating current (AC type) and a direct current type (DC type) according to a discharge mechanism, which is directly connected to a gas layer in which each electrode constituting the plasma display panel is enclosed in a discharge cell. The exposed and applied voltage is applied to the discharge gas layer as it is, and the AC type separates the electrodes by the discharge gas layer and the dielectric layer to form wall charges without absorbing the charged particles generated during the discharge phenomenon. By using such wall charges, a discharge is caused.

A general plasma display panel includes a pair of first and second substrates 10 and 11 facing each other as shown in FIG. 1, and an address electrode formed in a predetermined pattern on the second substrate 11. 16 and dielectric layers 17 are sequentially formed, and partition walls 18 are formed on the dielectric layers 17 to maintain the discharge distance and to prevent electro-optical crosstalk between the pixels. The phosphor layer 19 is formed on at least one side in the discharge space partitioned by the partition wall 18.

In the first substrate 10 coupled to the second substrate 11, the first electrodes 12 and the second electrodes 13 of a predetermined pattern are arranged in pairs to be orthogonal to the address electrodes 16. have. The first electrode 12 and the second electrode 13 are each provided with transparent electrodes 12a, 13a and bus electrodes 12b, 13b. The portion where the first electrode 12, the second electrode 13, and the address electrode 16 intersect forms one cell.

In addition, a dielectric layer 14 in which the first electrode 12 and the second electrode 13 are embedded is formed on a lower surface of the first substrate 10, and an MgO layer 15 is formed below the first substrate 10. A predetermined gas is injected into the discharge space partitioned by the first substrate 10 and the second substrate 11 as described above.

In the plasma display panel configured as described above, as voltage is applied to any one of the address electrode 16, the first electrode 12, and the second electrode 13, an address discharge occurs between the first electrode 10 and the first substrate 10. Charged particles are formed on the lower surface of the dielectric layer 14 (strictly, the lower surface of the MgO layer 15). In this state, sustain discharge is performed. The sustain discharge is applied to a surface of the dielectric layer 14 of the first substrate 10 by applying a predetermined voltage between the first electrode 12 and the second electrode 13 of the corresponding cell. Is done in At this time, the phosphor is excited by ultraviolet rays formed by plasma formation in the gas layer to form a pixel.

A black stripe may be formed on the plasma display panel as a black insulator between the pair of first and second electrodes 12 and 13 to improve contrast.

On the other hand, the discharge cells of the plasma display panel as described above are arranged as shown in FIG. That is, red (R), green (G), and blue (B) are arranged in one color each along the address electrodes A1, A2, A3, .... By the way, when the same fluorescent substance is apply | coated to each address electrode in this way, the difference in capacitance by a fluorescent substance arises between each address electrode.

For example, an address electrode to which a green phosphor is applied to charge at 70 V, which is a typical address voltage, with a peripheral address electrode turned off consumes approximately 35.2 μJ, whereas a blue phosphor is coated. In the case of the address electrode, 34.9 μJ is consumed, which is 0.9% less than that of green, and in the case of the address electrode coated with red phosphor, 31.6 μJ is consumed, which is 10.2% less than that of green.

In order to overcome such a difference in charging energy, a voltage waveform over time must be applied to each address line differently. That is, since the electrical characteristics are different for each address line, the kind of load applied to the address electrode becomes complicated.

In addition, the difference in capacitance between the address electrodes as described above causes a reduction in the address voltage margin.

The present invention has been made to solve the above problems, and an object thereof is to provide a plasma display panel capable of stabilizing voltage by making the electrical characteristics of each address electrode the same.

Another object of the present invention is to provide a plasma display panel with improved address voltage margin.

In order to achieve the above technical problem, the present invention is provided with a first and a second substrate facing each other to form a discharge space, a plurality of scan electrodes provided on the first substrate, the second substrate is provided A plasma display panel comprising a scan electrode, a plurality of address electrodes for causing an address discharge, and partition walls for partitioning the discharge space into a plurality of discharge cells coated with phosphors on the inside thereof.

A plasma display panel is characterized in that discharge cells of at least two colors are arranged along a direction in which one address electrode extends.

According to another feature of the present invention, the discharge cells adjacent to each other in the direction in which the address electrode extends may have different colors.

According to another feature of the invention, the ratio of each color of the discharge cells arranged in the extension direction of one address electrode and the ratio of each color of the discharge cells arranged in the extension direction of another address electrode may be approximately equal. Can be.

According to another feature of the invention, each color of the discharge cells arranged in the extending direction of the address electrode may be the same ratio.

According to another feature of the invention, the color of the discharge cells may be arranged so that the capacitance by the phosphor between each address electrode does not differ.

According to another feature of the invention, the color of the discharge cells may be arranged so that the white light is emitted when the light emission along any one of the address electrodes.

In the present invention, the color of the phosphor may be red, green, and blue, and the red, green, and blue discharge cells may be arranged in a direction in which the address electrode extends.

In addition, the partition wall is provided to surround each of the discharge cells, each discharge cell according to this may be rectangular or octagonal.

The partition wall may be provided to further partition the non-discharge region around the discharge cell.

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

3 is a partially exploded perspective view of a plasma display panel according to an exemplary embodiment of the present invention.

Referring to FIG. 3, in the plasma display panel according to an exemplary embodiment of the present invention, the first substrate 20 and the second substrate 21 made of transparent glass are disposed to face each other. And a discharge gas such as neon (Ne) or xenon (Xe) is filled between the second substrates 20 and 21 to form a discharge space S, and the edges of the substrates are flip glass (not shown). It is sealed and joined by a sealing material such as. The discharge space S is partitioned into a plurality of discharge cells E by the partition wall 28.

On the surface of the first substrate 20 facing the second substrate 21, a plurality of first electrodes 22 and second electrodes 23 are arranged in pairs with each other, for example, a predetermined pattern such as a stripe. Excreted to achieve These first and second electrodes 22 and 23 may be X electrodes and Y electrodes respectively corresponding to the common electrode and the scan electrode, and the first electrode 22 may be the scan electrode and the second electrode 23. Of course, this may be a common electrode.

The first and second electrodes 22 and 23 are transparent electrodes 22a and 23a formed of indium tin oxide (ITO), which is a transparent conductor, and silver and gold to complement line resistances of the electrodes. Bus electrodes 22b and 23b formed of Au or copper Cu. The transparent electrodes 22a and 23a and the bus electrodes 22b and 23b of the first and second electrodes may be formed by photolithography, screen printing, or the like. In this case, the bus electrodes 22b and 23b may include a black additive to improve contrast.

A first dielectric layer 24 is formed on the lead portion 20a to cover the first and second electrodes 22 and 23, and an MgO film 25 that functions as a protective film and a substantially cathode is formed thereon. do.

On the other hand, on the surface of the second substrate 21 facing the first substrate 20, an address electrode 26 is disposed so as to be orthogonal to the first and second electrodes 22 and 23, and each discharge cell ( E) is formed at the portion where the first and second electrodes 22, 23 and the address electrode 26 intersect. These discharge cells form one sub-pixel of the display.

The structure and pattern of the first electrode 22, the second electrode 23, and the address electrode 26 as described above may be variously modified according to design conditions.

The address electrode 26 may be formed so as not to be exposed to the discharge space S. According to a preferred embodiment of the present invention, the address electrode 26 is covered on the second substrate 21. The second dielectric layer 27 may be formed. The second dielectric layer 27 is preferably white in color so as to improve the brightness of the entire panel.

A rectangular barrier rib 28 is formed on the second dielectric layer 27 to surround each of the discharge cells E to form a rectangle of the discharge cells E. As shown in FIG. The phosphor 29 is coated on the inner surface of the partition wall 28 and the upper surface of the second dielectric layer 27 surrounded by the partition wall 28. The phosphor 29 is formed in red (R), green (G), and blue (B) colors in a space partitioned by the partition wall 28 to implement a color screen. The partition wall 28 may be formed of an insulating dielectric commonly used in plasma display panels, and may be formed by various methods such as screen printing, sandblasting, dry film, and photolithography.

The second dielectric layer 27 may not be formed on the upper surface of the address electrode 26, and only the phosphor 29 may be formed so that the address electrode 26 is not exposed to the discharge space S. .

Meanwhile, the partition wall 28 as described above is not limited to the rectangular structure as shown in FIG. 3, and may be variously formed. As shown in FIG. 4, the partition wall 28 is formed in a continuous octagonal structure to discharge cells ( The non-discharge region D may be partitioned into E) and the region adjacent thereto.

In another embodiment of the present invention as shown in FIG. 4, the non-discharge region D does not have a separate voltage applied thereto, and thus corresponds to a region where discharge or emission does not occur. This non-discharge region D is arranged around each discharge cell E. Since the discharge cell E is partitioned by the octagonal partition structure, it is located in the space between each octagon.

On the other hand, the discharge cells (E) are formed so that neighboring ones in the direction of the first and second electrodes 22, 23 share at least one partition wall, the width of the end portion in the direction of the address electrode 26 It is formed so that it may become narrower than the width | variety in a center part. On the other hand, although not shown in the drawings, the discharge cell (E) may be provided such that the depth at its end is shallower than the depth at the center. Therefore, the gap between the phosphor 29 and the first and second electrodes 22 and 23 can be narrowed at the end where the intensity of the gas discharge of the discharge cell E is relatively weak, and as a result, the phosphor is first, It can be disposed closer to the two electrodes to improve the conversion efficiency of the vacuum ultraviolet light generated during discharge into visible light.

Plasma display panels having a structure as described above have an arrangement of discharge cells as seen in FIG. 5.

That is, as shown in FIG. 5, red, green, and blue phosphors are coated on each of the discharge cells, thereby forming red discharge cells R, green discharge cells G, and blue discharge cells B. FIG. .

These various color discharge cells are arranged such that at least two or more colors are arranged along one address electrode line. According to an exemplary embodiment of the present invention as shown in FIG. 5, each of the address electrode lines A1 and A2, Red, green, and blue discharge cells (R) (G) (B) are all arranged along A3, ...). In addition, discharge cells adjacent to each other in the address electrode direction in each address electrode line are arranged to have different colors. In addition, it is preferable to arrange the discharge cells such that the ratio of each color is approximately the same for each address electrode line, for example, the red, green, and blue discharge cells of the discharge cells arranged along the first address electrode A1. The ratio and the ratio of the red, green, and blue discharge cells of the discharge cells arranged along the second address electrode A2 are approximately equal.

In addition, each color of the discharge cells arranged along each address electrode line may be configured in the same ratio. That is, the ratio of the red discharge cells, the green discharge cells, and the blue discharge cells in each address electrode line may be equal to 1: 1: 1.

The arrangement of the discharge cells as described above is possible by a variety of colors in addition to the above-mentioned red, green, blue.

In this way, the array of discharge cells is arranged so that the capacitance caused by the phosphor between each address electrode does not differ. That is, as shown in FIG. 5, red, green, and blue discharge cells are arranged in each of the address electrode lines A1, A2, A3, ..., so that the capacitance of the phosphors of the address electrodes is reduced. The average is that all address electrodes are approximately equal. At this time, since red, green, and blue discharge cells exist in the same ratio along each address electrode, white light is emitted when discharge is performed for each address electrode.

According to the present invention, the discharge cells of different colors are mixed on the average in the same ratio along each address electrode, so that the load applied to each address electrode becomes the same, and consequently contributes to stabilization of the address application voltage. do.

In addition, in the case where different colors are arranged in the same ratio on each of the address electrodes in this manner, the type of load applied is simplified as compared with the case of FIG. 2 in which the same colors are arranged in each address electrode.

That is, as shown in FIG. 2, when only the same color is arranged on each address electrode, first, only red line is turned on, second, only green line is turned on, third, only blue line is turned on; Seven different types of lights: green, five, red and blue lines adjacent to each other, sixth, green and blue lines adjacent to each other, seventh, red, green, and blue lines adjacent to each other. The load is applied to the address circuit.

On the other hand, as shown in FIG. 5, in the case where various colors are mixed in the same ratio on each address electrode in the same ratio, when the type of load to which the address circuit is applied turns on one line, turns on two adjacent lines, and adjacent three lines. All three types are simple, such as turning on. This is because the capacitance caused by the phosphor does not differ between the address electrodes, and thus the same electrical characteristics are exhibited for one independent address line. This can contribute to stabilization of address driving.

The arrangement of the discharge cells as described above may be equally applied to the case where the discharge cells are octagonal as shown in FIG. 4 as well as rectangular discharge cells as shown in FIG. 3. In addition, as shown in FIG. 5, not only the structure arranged in a lattice form, but also may be applied to various arrangement structures such as a case where discharge cells are arranged in a mosaic form.

According to the plasma display panel according to the present invention as described above, the following effects can be obtained.

First, the type of load applied to each address electrode can be simplified to stabilize the address voltage.

Second, address voltage margins can be improved.

Third, the electrical characteristics of the respective address electrodes can be maintained to be substantially the same.

Fourth, the response speed can be improved.

In the present specification, the present invention has been described with reference to limited embodiments, but various embodiments are possible within the spirit of the present invention. In addition, although not described, equivalent means will also be referred to as incorporated in the present invention. Therefore, the true scope of the present invention will be defined by the claims below.

1 is a schematic exploded perspective view of a structure of a general plasma display panel;

2 is a view schematically showing an arrangement of discharge cells of a typical plasma display panel;

3 is a partially exploded perspective view showing a plasma display panel according to an exemplary embodiment of the present invention having a rectangular partition wall;

4 is a partially exploded perspective view showing a plasma display panel according to another preferred embodiment of the present invention having an octagonal partition;

5 is a view schematically showing a state in which discharge cells are arranged in accordance with a preferred embodiment of the present invention.

<Brief description of the major symbols in the drawings>

20: first substrate 21: second substrate

22: first electrode 23: second electrode

22a, 23a: transparent electrode 22b, 23b: bus electrode

24: first dielectric layer 25: MgO layer

26 address electrode 27 second dielectric layer

28: partition 29: phosphor layer

S: discharge space E: discharge cell

D: non-discharge area R: red discharge cell

G: green discharge cell B: blue discharge cell

Claims (12)

First and second substrates facing each other to form a discharge space, a plurality of scan electrodes provided on the first substrate, a plurality of address electrodes provided on the second substrate to cause an address discharge and the scan electrodes; A plasma display panel comprising partition walls for partitioning the discharge space into a plurality of discharge cells coated with phosphors therein. And at least two color discharge cells are arranged in a direction in which any one of the address electrodes extends. The method of claim 1, And the discharge cells adjacent to each other in the direction in which the address electrode extends have different indices. The method of claim 1, And a ratio of each color of the discharge cells arranged in the extension direction of one address electrode to a ratio of each color of the discharge cells arranged in the extension direction of the other address electrode. The method of claim 1, And each color of the discharge cells arranged in the extending direction of the address electrode is the same ratio. The method of claim 1, And the color of the discharge cells is arranged so that the capacitance due to the phosphor between each address electrode does not differ. The method of claim 1, And the colors of the discharge cells are arranged so that white light is emitted when the discharge cells emit light along one of the address electrodes. The method according to any one of claims 1 to 6, The color of the phosphor is a plasma display panel, characterized in that the red, green and blue. The method of claim 6, And red, green, and blue discharge cells are arranged in a direction in which the address electrode extends. The method according to any one of claims 1 to 6, And the partition wall is provided to surround each of the discharge cells. The method of claim 9, Wherein each discharge cell is rectangular. The method of claim 9, Wherein each discharge cell is octagonal. The method of claim 11, And the partition wall is further configured to further partition a non-discharge area around the discharge cell.