KR100525890B1 - Plasma display panel - Google Patents

Abstract

Disclosed is a plasma display panel that can improve panel unevenness through cell structure optimization.

Plasma display panel of the present invention is formed in the well-shaped partition wall structure in which the discharge cells are partitioned by the horizontal partition wall and the vertical partition wall, so as to widen the width of the upper electrode or narrow the width of the horizontal partition wall. Minimizing spots can improve brightness and provide higher definition image quality.

Description

Plasma display panel {Plasma display panel}

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 capable of improving panel unevenness through cell structure optimization.

Recently, as the demand for multimedia displays increases, the technology development for plasma display panels (PDPs), which is promising for home use, is rapidly made due to its advantages in large screens and viewing angles and favorable prices. Research on increasing luminance and discharge efficiency has been actively conducted. The PDP generally uses a gas discharge phenomenon to display an image using visible light generated by vacuum ultraviolet rays generated during gas discharge to emit phosphors.

Plasma Display Panel (hereinafter referred to as 'PDP') is a display device in which ultraviolet light generated by gas discharge excites a phosphor to generate visible light from the phosphor. PDP has the advantages of being thin, light, high-definition large screen, and wider viewing angle than the cathode ray tube (CRT), which has been the dominant display device. The PDP consists of discharge cells arranged in a matrix.

1 is a longitudinal sectional view showing a discharge cell structure of a surface discharge PDP of a three-electrode alternating current drive type which is commonly used.

The discharge cell of the PDP shown in FIG. 1 includes an upper substrate 10 which is a display surface of an image, and a lower substrate 12 arranged in parallel with the upper substrate 10 by the partition 14. The partition wall 14 serves to support the upper substrate 10 and the lower substrate 12 as well as providing a discharge space inside the cell to block electrical and optical interference between the cells. On the upper substrate 10, a pair of sustain electrodes 16, that is, a scan / sustain electrode and a sustain electrode, are arranged side by side, and the transparent electrode 16A and the bus electrode 16B of the sustain electrode pair 16 are arranged. At this time, the width of the transparent electrode 16A is formed to be wider than the width of the bus electrode 16B so that more visible light is emitted to the outside through the transparent electrode 16A. The sustain electrode pair 16 and the address electrode 22 for causing discharge are disposed on the lower substrate 12. On the upper substrate 10 on which the sustain electrode pairs 16 are disposed, the upper dielectric 18 for charge accumulation is formed flat. The upper dielectric 18 forms a wall charge and maintains discharge by the discharge sustain voltage, protects the electrode from ion shock during gas discharge and serves as a diffusion barrier. The protective film 20 formed on the surface of the upper dielectric 18 protects the upper dielectric 18 from sputtering of plasma particles, thereby extending its life and increasing the emission efficiency of secondary electrons. Magnesium oxide (MgO) film is mainly used to reduce the discharge characteristic change. A lower dielectric material 24 is formed on the lower substrate 12 on which the address electrode 22 is disposed, and on the lower dielectric material 24, a phosphor 26 for generating visible light having a unique color is applied to the partition 14. It is. The phosphor 26 is excited by a vacuum ultraviolet ray (VUV) having a short wavelength generated during gas discharge to generate visible light of red, green, and blue (R, G, B). The discharge space provided inside the discharge cell is filled with discharge gas, for example, mixed gas atoms of He-Ne, Ne-Xe, and He-Ne-Xe gases. In the discharge cell of this structure, vacuum ultraviolet rays generated by the sustain discharge between the sustain electrodes 16 after being selected by the address discharge between the address electrode 22 and the sustain electrodes 16 excite the phosphor 26. By emitting visible light, the PDP displays a desired image.

In the PDP having such a structure, the partition wall is divided into a stripe type and a well type partition wall structure. Here, the stripe-type barrier rib structure is easy to exhaust, but has a disadvantage in that the luminance is low due to the small coating area of the phosphor 26. On the other hand, as shown in Fig. 2, the well-shaped partition wall structure does not exhaust well, but the coated area of the phosphor 26 has an advantage that the luminance can be increased.

In the PDP having such a structure, the phosphor 26 plays a very important role of emitting red, green, or blue visible light by excitation, transition, and emission by 147 nm ultraviolet rays generated during plasma discharge. As the method for forming the phosphor 26, screen printing is mainly used.

The phosphor process using the screen printing method first aligns the screen, and then prints / drys a predetermined phosphor paste and specifies it. At this time, this process should be repeated for each color. By such a process, a predetermined phosphor is formed inside the partition wall.

In particular, when printing by the printing method in the well-shaped partition structure as shown in Figure 2, as shown in Figure 3, the phosphor paste printed inside the partition 14 is formed in the partition while shrinking by firing, horizontal Phosphor paste printed on the upper part of the partition 27 is not removed by firing, and the phosphor is directly deposited on the upper part of the horizontal partition 27 (area A). At this time, since the vertical partition wall 28 is protected by a string, phosphors are not buried.

In general, the sustain electrode pairs 16 of the upper substrate are arranged along the transverse bulkhead direction.

In this case, when the lower substrate 12 and the upper substrate 10 are bonded together, the phosphors buried at the upper end of the horizontal partition wall 27 are buried in the protective film 20 of the upper substrate 10, which is illustrated in FIG. 4. Is shown. As shown in FIG. 4, the phosphor residue 27 is attached on the protective layer 20, and the position where the phosphor residue 27 is attached is at the end of the transparent electrode 16A of the upper substrate 10. In the case of the opposite point, the screen may be displayed as a spot on the screen due to the phosphor residue 27 when the screen is driven, and the image quality may be deteriorated by the spot.

Accordingly, an object of the present invention is to provide a plasma display panel in which the unevenness of the panel is improved by optimizing the cell structure.

According to a first preferred embodiment of the present invention for achieving the above object, an upper electrode formed on an upper substrate, an upper dielectric layer and a protective layer and a lower electrode formed on the lower substrate, lower dielectric, partition and fluorescent film In the plasma display panel formed by bonding the lower plate is formed, the partition wall has a well-shaped partition structure in which the discharge cells are partitioned by the horizontal partition wall and the vertical partition wall, the first partition corresponding to the scan electrode and the sustain electrode on the horizontal partition wall And second upper electrodes are disposed, and the widths of the horizontal barrier ribs are relatively narrower than the upper electrodes.

According to a second preferred embodiment of the present invention, an upper plate formed of an upper electrode, an upper dielectric layer, and a protective layer formed on an upper substrate and a lower plate formed of a lower electrode, a lower dielectric, a partition wall, and a fluorescent film formed on the lower substrate are bonded to each other. In the plasma display panel, the barrier rib has a well-type barrier rib structure in which discharge cells are partitioned by a horizontal barrier rib and a vertical barrier rib, and first and second upper electrodes corresponding to scan electrodes and sustain electrodes are formed on the barrier rib. Each of them is disposed, and the width of each of the upper electrodes is relatively wider than that of the horizontal partition wall.

According to the first and second embodiments of the present invention, the distance between the end of the horizontal partition wall and the end of each upper electrode is preferably at least 5㎛.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention.

5 is a view showing the structure of a plasma display panel according to a preferred embodiment of the present invention.

Referring to FIG. 5, in the preferred plasma display panel of the present invention, the partition wall 30 is formed on a lower substrate (not shown) in a well partition structure including a horizontal partition 32 and a vertical partition 31. In this case, upper electrodes 33 and 34 of an upper substrate (not shown) are disposed to face opposite ends of the horizontal partition wall 32, and a black matrix for blocking visible light between the upper electrodes 33 and 34. 35 is disposed to be parallel to the upper electrodes 33 and 34. In this case, the upper electrodes 33 and 34 include a transparent electrode and a bus electrode. In this case, one of the upper electrodes disposed on the horizontal barrier rib 32 may be the scan electrode 33 and the other may be the sustain electrode 34.

R, G, and B phosphors are formed in each discharge cell 36 partitioned by the horizontal partition 32 and the vertical partition 31.

As described above, when printing in a direction perpendicular to the horizontal partition wall to form the phosphor, the phosphor is buried on the upper horizontal partition wall. In particular, when the fluorescent material buried in the upper portion of the horizontal partition is buried at the point opposite to the end of the transparent electrode, it appears as a stain on the screen to cause a degradation in image quality.

The present invention is to improve the structure of the barrier ribs or the upper electrode in order to solve the occurrence of stains caused by the phosphor to be buried at the point opposite to the ends of the transparent electrode of the upper electrode (33, 34).

In the first embodiment of the present invention, the width W1 of the horizontal partition wall 32 formed on the lower substrate is relatively reduced compared to the upper electrodes 33 and 34 disposed on the upper substrate. That is, instead of fixing the upper electrodes 33 and 34 so that the ends of the horizontal barrier ribs 32 are separated from the ends of the upper electrodes 33 and 34 in distance, the horizontal barrier ribs 32 have a width W1. Will be formed to be reduced.

Preferably, the end of the horizontal partition wall 32 may be formed to be spaced apart by at least 5㎛ from the end of the upper electrode (33, 34).

Accordingly, as the width W1 of the horizontal barrier rib 32 is narrower than the upper electrodes 33 and 34, the width of the phosphor on the horizontal barrier rib 32 is minimized, thereby increasing the width of the horizontal barrier rib 32. Staining by stained phosphors can be minimized. In addition, as the width W1 of the horizontal partition wall 32 becomes narrower, the upper electrode is relatively wider from the horizontal partition wall, so that the phosphors buried in the upper part of the wider horizontal partition wall are completely shielded by the wider upper electrode. It is possible to block the occurrence of stains by the phosphor on the upper portion of the partition wall (32).

In the second embodiment of the present invention, the width W2 of the upper electrodes 33 and 34 formed on the upper substrate is relatively wider than the horizontal partition wall 32 formed on the lower substrate. That is, instead of fixing the horizontal partition 32 so that the ends of the upper electrodes 33 and 34 move away from the end of the horizontal partition 32 in a distance, the upper electrodes 33 and 34 become wider. Will be formed. In this case, in detail, one end of the upper electrodes 33 and 34 in contact with the black matrix 35 is fixed so that the other end thereof extends toward the discharge cell 36.

Even in this case, the ends of the upper electrodes 33 and 34 may be formed to be spaced apart by at least 5 μm from the ends of the horizontal partition walls 32.

Therefore, as the width of each of the upper electrodes 33 and 34 disposed on the horizontal partition wall 32 becomes wider, the phosphors buried on the upper part of the horizontal partition wall 32 are completely shielded by the wider upper electrode. It is possible to block the occurrence of stains by the phosphor on the upper portion of the partition wall (32).

As described above, according to the present invention, in the well-shaped partition wall structure, the width of the upper electrode disposed on the horizontal partition wall or the width of the horizontal partition wall is narrowed so that the phosphors on the upper part of the horizontal partition wall are separated from the ends of the upper electrode. By moving away, the stain by the phosphor deposited on the upper part of the horizontal bulkhead can be minimized to improve the luminance and to realize higher definition image quality.

1 is a longitudinal cross-sectional view showing a discharge cell structure of a surface discharge PDP of a three-electrode alternating current drive method commonly used.

2 is a view showing a well partition wall structure.

3 is a view showing a state in which the phosphor is printed in the well-shaped partition wall structure.

4 is an exemplary view showing a state in which a phosphor is on an upper substrate.

5 is a view showing the structure of a plasma display panel according to a preferred embodiment of the present invention;

<Name of the code for the main part of the drawing>

30: well-shaped bulkhead 31: vertical bulkhead

32: horizontal bulkhead 33, 34: upper electrode

35 black matrix 36 discharge cell

W1: width of horizontal bulkhead W2: width of upper electrode

Claims (9)

A plasma display panel comprising a top plate formed of an upper electrode, an upper dielectric layer, and a protective layer formed on an upper substrate, and a lower plate formed of a lower electrode, a lower dielectric, a partition wall, and a fluorescent film formed on the lower substrate. The barrier rib has a well-type barrier rib structure in which discharge cells are partitioned by horizontal barrier ribs and vertical barrier ribs, and first and second upper electrodes corresponding to scan electrodes and sustain electrodes are disposed on the horizontal barrier ribs, respectively. And the width of the horizontal partition wall is relatively narrower than that of an electrode. The plasma display panel of claim 1, wherein when the width of each upper electrode is fixed, an end of the horizontal partition wall is formed to be far from an end of the upper electrode. delete A plasma display panel comprising a top plate formed of an upper electrode, an upper dielectric layer, and a protective layer formed on an upper substrate, and a lower plate formed of a lower electrode, a lower dielectric, a partition wall, and a fluorescent film formed on the lower substrate. The barrier rib has a well barrier rib structure in which discharge cells are partitioned by a horizontal barrier rib and a vertical barrier rib, and first and second upper electrodes corresponding to a scan electrode and a sustain electrode are disposed on the horizontal barrier rib, respectively. Compared to each other, the plasma display panel is formed to have a relatively wider width. The plasma display panel of claim 4, wherein when the width of the horizontal barrier ribs is fixed, the ends of the upper electrodes are formed to be far from the ends of the horizontal barrier ribs. delete The plasma display panel of claim 4, wherein one end of each of the upper electrodes is fixed and the other end of the upper electrode extends in the discharge cell direction. The plasma display panel of claim 1 or 4, wherein a distance between an end of the horizontal barrier rib and an end of each of the upper electrodes is at least 5 μm. The plasma display panel of claim 1 or 4, wherein a black matrix is disposed on the horizontal partition wall between the first and second upper electrodes.