KR100669329B1 - Plasma display panel - Google Patents

Abstract

The PDP of the present invention is a plasma display panel which displays an image by gas discharge using a plurality of discharge cells provided with a display electrode of a sustain electrode and a scan electrode pair between a first substrate and a second substrate disposed opposite to each other. Red, green, and blue discharge cells constituting one pixel are arranged in a triangular shape, and each of the display electrodes is a combination of at least two or more line portions extending along an overlapping portion of neighboring discharge cells in an extension direction thereof. Is formed.

Line part, bus electrode, plasma, discharge cell, void, zigzag, triangle

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

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

FIG. 2 is a cross-sectional view of the plasma display panel cut along the line A-A of FIG.

3 is a view illustrating an arrangement structure of discharge cells according to an embodiment of the present invention.

4 is a layout view illustrating an electrode structure together with a partition wall according to an exemplary embodiment of the present invention.

5 is a layout view illustrating an electrode structure according to another embodiment of the present invention with a partition wall.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and more particularly, to a plasma display panel having improved luminance by improving an electrode structure.

In general, a plasma display panel (PDP) is a display device that realizes an image by using visible light generated by excitation of a phosphor by a vacuum ultraviolet ray (VUV) emitted from a plasma obtained through gas discharge. to be. Such a PDP can realize an ultra-large screen of 60 inches or more within a thickness of only 10 cm, and has a characteristic of excellent color reproducibility and less distortion due to a viewing angle because it is a self-luminous display device such as a CRT. In addition, the manufacturing method is simpler than the liquid crystal display, and thus has advantages in terms of productivity and cost, and thus has been in the spotlight as the next-generation industrial flat panel display and home TV display.

The structure of the PDP has been developed for a long time since the 1970s, and the structure generally known is a three-electrode surface discharge type structure. The three-electrode surface discharge type structure consists of one substrate including a display electrode located on the same surface and another substrate including an address electrode vertically spaced apart from the substrate and having a discharge gas interposed therebetween. to be. In general, the presence or absence of the discharge is determined by the discharge of the address electrode facing the scan electrode independently connected to each line, and the sustain discharge indicating the luminance is performed by two electrode groups located on the same plane. .

In this case, in order not to block light emitted from the substrate, the display electrode is generally formed of a transparent electrode. However, since the transparent electrode itself has high resistance, in order to compensate for its conductivity, the metal electrode is combined with the transparent electrode to form the sustain electrode.

In this case, the transparent electrode is made of a material such as indium tin oxide (ITO) or SnO _2, and the metal electrode is a thin film made of three layers of Ag, Cr / Cu / Cr, or a thin film made of a two-layer structure of Al / Cr. do.

Such a conventional electrode structure is a metal electrode is formed on the surface of the substrate by a photo etching method, a liftoff method, the transparent electrode is a photo etching method, a liftoff method in the next step To form.

Therefore, there is a disadvantage that the work process is very complicated, thereby increasing the manufacturing cost of the panel. In addition, since the transparent electrode itself is expensive, this also increases the manufacturing cost.

Therefore, efforts are being made to form the storage electrode only with the metal electrode without using the transparent electrode, and one of the related arts includes a "plasma display panel" disclosed in US Pat. No. 6,522,072.

According to this, there is an advantage that the manufacturing cost can be lowered as compared with the electrode structure described above. However, the sustain electrode formed of only the metal electrode has a problem of lowering the aperture ratio of the panel and decreasing luminance.

As an alternative to solve this problem, it is possible to consider a method of increasing the distance between the two metal electrodes positioned with the discharge gap therebetween, but this causes a problem that the discharge start voltage is increased and the discharge becomes unstable. There is a demand for improvement.

The present invention was devised to solve the above problems, and to provide the present invention capable of stable discharge while improving the aperture ratio of the panel by using only metal electrodes.

Another object of the present invention is to provide a present invention in which structural strength is improved by arranging the partition walls so as to be offset from each other.

In order to achieve the above object, the plasma display panel provided in one embodiment of the present invention,

A plasma display panel which displays an image by gas discharge using a plurality of discharge cells provided with a display electrode of a sustain electrode and a scan electrode pair between a first substrate and a second substrate that are disposed to face each other. Red, green, and blue discharge cells are arranged in a triangular shape, and each of the display electrodes is formed by a combination of at least two or more line portions extending along an overlapping portion of neighboring discharge cells in an extension direction thereof.

In the present invention, each of the display electrodes may be formed to include a first line part facing each other inside the discharge cell to form a discharge gap, and a second line part spaced apart from each other to form an empty space therebetween.

The discharge cell may be formed by a first partition member extending in a direction crossing the display electrode and a second partition member partitioning discharge cells adjacent to each other along the extension direction of the display electrode. Can be.

Preferably, the display electrode is positioned between the second partition wall members adjacent in the extending direction of the display electrode.

In this case, the distance between the first line portion and the second line portion may be formed to be smaller than the width of the second partition member positioned adjacent to each other in the extending direction of the display electrode.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention.

FIG. 1 is a partially exploded perspective view illustrating a plasma display panel according to an embodiment of the present invention, and FIG. 2 is a partially combined cross-sectional view of the A-A line of FIG. 1.

As shown, in the PDP of the present embodiment, the first substrate 10 (hereinafter referred to as 'back substrate') and the second substrate 20 (hereinafter referred to as 'front substrate') are disposed to face each other at predetermined intervals. Color spaced discharge cells 18R, 18G, and 18B formed by the partition wall 16 are provided in the space between the substrates 10 and 20. In the discharge cell 18, a phosphor layer 19, which is excited by ultraviolet rays and emits visible light, is formed along the partition surface 161 and the bottom surface 141, and discharge gas (for example, to generate plasma discharge). Mixed gas containing xenon (Xe), neon (Ne), and the like.

On the opposite surface 201 of the front substrate 20 facing the rear substrate 10, display electrodes 25 are formed to correspond to the discharge cells 18 in one direction (the x-axis direction of the drawing). The display electrode 25 is composed of a scanning electrode 21 and a sustain electrode 23 in its functional function, and is formed in a bar shape extending in one direction (x-axis direction in the drawing). Discharge gaps are formed in the discharge cells to face each other.

In the present embodiment, the display electrode 25 is formed only of a conductive material of metal, and an empty space S is formed inside each of the electrodes 21 and 23. The display electrode 25 of the present exemplary embodiment thus formed will be described in detail below with reference to the drawings.

The display electrode 25 is covered by the dielectric layer 28, and an MgO protective film 29 is further formed on the surface 281. The MgO passivation layer 29 protects the dielectric layer 28 from collision of ionized ions during plasma discharge. The MgO protective layer 29 also has a high emission coefficient of secondary electrons when it collides with ions, thereby increasing discharge efficiency.

In addition, address electrodes 12 are formed in one direction (y-axis direction of the drawing) on the opposite surface 101 of the front substrate 20 of the back substrate 10, and cover the address electrodes 12 with the rear substrate ( A dielectric layer 14 is formed over the entire inner surface of 10. The address electrodes 12 are formed parallel to each other while crossing the discharge cells 18 in a state where neighboring ones maintain a predetermined interval.

The partition wall 16 is formed above the dielectric layer 14. In the present embodiment, the partition wall 16 is formed such that the red, green, and blue discharge cells 18R, 18G, and 18B constituting one pixel have a triangular arrangement. As one such example, the drawings illustrate a rectangular closed partition wall arranged to cross each other, and the following description is based on this, but the present invention is not limited thereto.

As shown, in the present embodiment, the partition wall 16 has a first partition member 16a extending in parallel with the address electrode 12 and a second partition wall formed to intersect the first partition member 16a. It is made of a member 16b. In this case, the first partition member 16a partitions discharge cells of different colors, and the second partition member 16b divides each discharge cell into independent discharge spaces.

Thus, the discharge cells 18 have a lattice shape. At this time, since the second partition member 16b is formed in a zigzag shape, when the discharge cells 18 are arranged in a row in a row, the green, red, and blue discharge cells 18G, 18R, and 18B are sequentially arranged. The green and blue discharge cells 18G and 18B are arranged in a symmetrical manner, and the red discharge cells 18R are relatively shifted in the column direction (y-axis direction in the drawing) than the green or blue discharge cells. Accordingly, the set of red, green, and blue discharge cells 18R, 18G, and 18B constituting one pixel has a triangular arrangement (see FIG. 3).

Next, the relationship between the arrangement of the display electrodes and the electrode structure according to the discharge cells having the pixel array as described above will be described in detail. In the present embodiment, the display electrode is made of only metal electrodes without using transparent electrodes.

4 is a partial plan view selectively showing a positional relationship between a display electrode and a discharge cell in the PDP shown in FIG. 1. In FIG. 4, only the display electrode and the discharge cell are shown, and the address electrode is not shown. The reference numerals of the display electrodes are described based on the green discharge cells.

In the present embodiment, each of the scan electrode 21 and the sustain electrode 23 is made of a combination of line portions having a bar shape, and has a shape symmetrical with each other. These line portions are elongated in one direction.

The scan electrode 21 or the sustain electrode 23 is composed of at least two line portions spaced apart from each other. Each line portion is elongated in the direction crossing the first partition member 16a (or the direction intersecting with the address electrode), and maintains a constant distance therebetween. Accordingly, the interior of the electrodes 21 and 23 forms an empty space S.

The scan electrode 21 and the sustain electrode 23 formed as described above are positioned to face each other in the discharge cell 18, and are respectively located adjacent to the second partition member 16b that partitions each discharge cell 18. Accordingly, the discharge gap 18 is formed at the center of the discharge cell 18 to face each other.

On the other hand, in the present embodiment, the discharge cells have a triangular arrangement. In consideration of this, the sustain electrodes and the scan electrodes are positioned along the discharge cells.

The discharge cells 18 are alternately arranged in a row in the order of green, red, and blue, and the green and blue discharge cells 18G and 18B are symmetrical with each other with the first partition member 16a therebetween. Are arranged. The red discharge cells 18R positioned therebetween are positioned over two green (or blue) discharge cells 18G up and down (y-axis direction in the drawing). Therefore, the red discharge cells 18R partially overlap the green (or blue) discharge cells 18G in part, and the distance between them corresponds to "w".

On the other hand, each of the scan electrode 21 and the sustain electrode 23 is formed to extend in a straight line in the direction crossing the address electrode 12, is formed between the "d" to cross the discharge cells for each color do. Accordingly, the protruding length d (or the distance between the first line portion and the second line portion) of the scan electrode 21 or the sustain electrode 23 is the width W between the adjacent second partition wall members 16b. Must be less than).

Accordingly, each of the scan electrodes 21 and the sustain electrodes 23 is positioned between the second partition wall members 16b adjacent to each other in the extending direction (the x-axis direction in the drawing), and the neighbors with respect to the first partition wall members 16a are adjacent to each other. When viewed from one discharge cell, they are arranged in a line symmetry where the position is changed upside down.

That is, in the other discharge cell 18R adjacent to the line part which has faced the discharge cell center in one discharge cell (for example, 18G), it is located toward the end of a discharge cell, ie, the 2nd partition member 16b. As described above, although the scan electrodes 21 and the sustain electrodes 23 are each formed to extend in a straight line in one direction, the scan electrodes 21 and the sustain electrodes 23 are changed in a zigzag shape along the discharge cells in the extending direction of the electrodes.

As described above, in the present embodiment, line portions (hereinafter, 'first line portions') 211 and 231 are formed to face each other to form a discharge gap G in the form of alternating along discharge cells. Apart from the second partition wall member 16b, other line portions (hereinafter referred to as 'second line portions') 212 and 232 are formed to form the scan electrodes 21 and the sustain electrodes 23, respectively.

Accordingly, a counter discharge at the initial stage of discharge is formed according to an electrical signal applied to each electrode between a pair of adjacent line parts 211 and 231 centered on the discharge cell.

The initial counter discharge started between the first line portions 211 and 231 around the discharge gap G is diffused between the second line portions 212 and 232 and induced to the surface discharge using the entire discharge cell. At this time, if the first line portion 211, 231 and the second line portion 212, 232 is too wide, since the discharge is not diffused, an appropriate distance should be maintained, and this depends on various factors involved in plasma discharge. Although not limited, it is desirable to maintain about 130 (μm) microns within the general drive voltage range.

In the present embodiment, the first line portions 211 and 231 and the second line portions 212 and 232 constituting the scan electrodes 21 and the sustain electrodes 23 are connected to the inside of the discharge cells 213 and 233. Are connected to each other by

In this case, the connecting portions 213 and 233 are positioned along the center line of the discharge cell 18 along the longitudinal axis (y-axis direction of the drawing) so that the distribution of discharges can be geometrically uniform for the entire discharge cell. The ends thereof are connected to the second line parts 212 and 232, and extend to the first line parts 211 and 231 in a straight line to be in contact with each other.

As such, since the first line portions 211 and 231 and the second line portions 212 and 232 spaced apart from each other are connected to each other by the connecting portions 213 and 233, the wall charges generated during the discharge process are connected to the connecting portions ( The opposite discharge formed at the discharge gap G between the second line portions 212 and 232 while traveling along the lines 213 and 233 extends to the first line portions 211 and 231 to facilitate surface discharge having a long discharge path. It acts to form.

On the other hand, Figure 5 shows another embodiment of the connecting portion, according to this embodiment has a structure in which the connecting portion (213a, 233a) is further added on the first partition member. The added connecting portions 213a and 233a operate substantially to facilitate the appearance of the electric field generated between the line portions from the counter discharge to the surface discharge.

3, in the present embodiment, third line portions 214 and 234 may be further formed between the first line portions 211 and 231 and the second line portions 212 and 232 to induce discharge diffusion. . Accordingly, the counter discharge formed between the first line portions 211 and 231 serves to induce surface discharge while diffusing the third line portions 214 and 234 into the second line portions 212 and 232. .

On the other hand, in the present embodiment, the discharge gap G is preferably formed in a double structure of a short gap G1 having a relatively short distance and a long gap G2 longer than the short gap G1. In particular, the long gap G2 is preferably formed at the intersection point P where the connecting portions 213 and 233 and the first line portions 211 and 231 meet. The long gap G2 is connected to the discharge portion 213. , 233 serves to guide the surface discharge easily occurring between the first line portions 211 and 231.

As described above, although the present invention has been described by way of limited embodiments and drawings, the present invention is not limited thereto and is intended by those skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of equivalents of the claims to be described.

According to the present invention, the above-mentioned problem is solved, so that the electrodes are partially formed in the empty space, so that the aperture ratio of the panel is improved compared to the prior art, thereby increasing the light emission luminance. Moreover, there is an advantage that the combination of the conventional bus electrode and the transparent electrode can be easily applied to the discharge cell having the triangular pixel arrangement, which has been difficult to arrange electrodes. This helps to form the structural wall more firmly.

In addition, according to the present invention, the distance between the discharge gaps of the adjacent discharge cells is increased more than before, and the effect of improving the problem that the adjacent discharge cells are influenced by the discharge gap showing the strongest discharge intensity is affected by misdischarge. There is.

Claims (11)

A first substrate; An address electrode formed on an upper surface of the first substrate; A second substrate facing each other at a distance from the first substrate; A display electrode formed on an opposite surface of the second substrate facing the first substrate along a direction crossing the address electrode; And A partition wall disposed between the first substrate and the second substrate to partition a discharge cell; The discharge cells are arranged in a triangle shape of red, green, and blue discharge cells constituting one pixel; A first partition member extending in a direction crossing the display electrode and a second partition member zigzag partitioning adjacent discharge cells along the extension direction of the display electrode; The display electrode is formed of a combination of a sustain electrode and a scan electrode; The sustain electrode and the scan electrode are each formed of a combination of at least two line portions extending along overlapping portions of adjacent discharge cells in an extending direction thereof; The two or more line portion combinations include a first line portion facing each other in the discharge cell to form a discharge gap, and a second line portion spaced apart from each other to form an empty space therebetween, And the display electrode is positioned between the second partition wall members adjacent in the extending direction of the display electrode. delete delete delete The method of claim 1, And a gap between the first line portion and the second line portion smaller than a width of a second partition member positioned adjacent to each other in an extension direction of the display electrode. The method of claim 1, Each of the display electrodes And a connecting portion connecting the first line portion and the second line portion. The method of claim 6, Each of the display electrodes And a third line portion positioned between the first line portion and the second line portion. The method of claim 6, And the discharge gap is formed by a combination of a long gap and a short gap of different lengths. The method of claim 8, And the long gap is formed at an intersection point where the first line part and the connection part meet. The method of claim 1, And the line portions are formed of metal electrodes. The method of claim 1, And the first line portion and the second line portion are elongated in one direction in parallel with each other.

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