KR20020056443A - Plasma display panel - Google Patents

Abstract

PURPOSE: A plasma display panel is provided to improve luminance by using zigzag barrier ribs. CONSTITUTION: A plasma display panel comprises a lower plate(76), address electrodes(82x) and barrier ribs(74). The barrier ribs(74) are formed in parallel to the address electrodes(82x) on the lower plate(76). Phosphor is coated over the barrier ribs(74) and the lower plate(76). The barrier ribs(74) are formed as zigzag and surround a cell so that pixel cells are connected by narrow channels to facilitate gas exhaustion and gas injection. The narrow channels made a higher discharge starting voltage than wide channels so as to prevent cross-talk in direction of the barrier ribs(74). The zigzag barrier ribs(74) increase the coated area of the phosphor and reflectivity of the barrier ribs(74).

Description

Plasma Display Panel

The present invention relates to a delta type cell structure plasma display panel.

Recently, a liquid crystal display (hereinafter referred to as "LCD"), a field emission display (hereinafter referred to as "FED") and a plasma display panel (hereinafter referred to as "PDP") Flat display devices such as the like have been actively developed. The PDP emits a phosphor by 147 nm ultraviolet rays generated when the He + Xe or Ne + Xe inert mixed gas is discharged, thereby displaying an image including characters or graphics. Such a PDP is not only thin and large in size, but also simple in structure, and has a high luminance and high luminous efficiency as compared to other flat display devices. Due to these advantages, research on PDP is being actively conducted.

The three-electrode AC surface discharge type PDP has advantages of low voltage driving and long life because wall charges are accumulated on the surface during discharge and protect the electrodes from sputtering caused by the discharge.

1 is a perspective view showing a conventional stripe-type partition wall structure.

2 is a perspective view showing a conventional well-shaped partition wall structure.

1 and 2, a discharge cell of a PDP includes a scan / hold electrode 12Y and a common sustain electrode 12Z formed on an upper substrate 10, and an address electrode formed on a lower substrate 18. (12X). An upper dielectric layer 14 and a passivation layer 16 are formed on the upper substrate 10 on which the scan / hold electrode 12Y and the common sustain electrode 12Z are formed. The upper dielectric layer 14 accumulates wall charges generated during plasma discharge, and the protective layer 16 prevents damage to the upper dielectric layer 14 due to sputtering generated during plasma discharge and increases emission efficiency of secondary electrons. . The lower dielectric layer 22 and the partitions 24a and 24b are formed on the lower substrate 18 on which the address electrode 12X is formed. The phosphor 26 is applied between the lower dielectric layer 22 and the partition walls 24a and 24b. The phosphor 26 is excited by ultraviolet rays generated during plasma discharge to generate visible light of any one of red, green, and blue. Inert gas for gas discharge is injected into the discharge space provided between the upper and lower plates 10 and 18 and the partition walls 24a and 24b. The partitions 24a and 24b are formed in parallel with the address electrode 12X to prevent the ultraviolet rays and the visible light generated by the discharge from leaking to the adjacent discharge cells.

The partition structure of the conventional AC surface discharge plasma display is divided into a stripe type as shown in FIG. 1 and a well type as shown in FIG. 2.

In the case of the stripe structure shown in Figure 1 is easy to exhaust, but has a disadvantage of a small phosphor coating area. In addition, the well structure shown in FIG. 2 has a problem in that a large coating area of the phosphor may increase luminance, but exhaust gas is poor.

In order to solve this problem, a PDP having a delta partition structure as shown in FIG. 3 has been proposed.

Referring to FIG. 3, a discharge cell of a PDP having a delta partition structure includes sustain electrodes 12Y and 12Z formed on an upper substrate 10 and an address electrode 12X formed on a lower substrate 18. It is provided. The sustain electrodes 12Y and 12Z are formed of the transparent electrode 12a and the bus electrode 12b. The partition wall 24c formed on the lower substrate 18 on which the address electrode 12X is formed has a structure in which one cell is surrounded by six surfaces and connected to narrow channels 34. In this structure, one cell is surrounded by six surfaces, and the coating area of the phosphor is increased, and the luminance can be improved by increasing the reflectance, and each color is connected to a narrow channel to facilitate exhaust or gas injection. In addition, since the discharge start voltage in the narrow channel is higher than the wide channel, it has an advantage of preventing crosstalk in the partition wall direction. In addition, the bulkhead fabrication method or driving method is the same as the conventional one, it is possible to obtain an increase in brightness and efficiency without additional processes.

An electrode structure of a PDP having such a delta partition structure is shown in FIG. 4 in detail.

Referring to FIG. 4, this electrode structure is composed of two sustain electrodes 12Y and 12Z, similarly to the stripe partition wall or well partition wall structure. The sustain electrodes 12Y and 12Z are composed of a transparent electrode 12a made of a transparent electrode material for increasing transmittance of visible light and a metal bus electrode 12b for lowering high electrical resistance of the transparent electrode 12a. However, since the sustain electrodes 12Z and 12Y are symmetrically positioned in all pixel cells, unlike the other structure, the metal bus electrode 12b is positioned at the center of the transparent electrode 12a. For this reason, light in the upper and lower parts of the cell is blocked by the bus electrode, and black lines are formed in the direction of the electrode, thereby reducing the luminance.

That is, it is necessary to drive two cells up and down with one holding line, but when the centers are not aligned when the top and bottom plates are joined, the discharge voltage is different, which is likely to cause misdischarge. In addition, the margin of the driving voltage is reduced.

The color plasma display device has a structure as shown in Figs. 5A and 5B.

5A and 5B, a delta type phosphor layer 56 is formed on the lower surface of the upper substrate 30. The first anode 22a and the second anode 22b are separately formed on the upper substrate 30 and alternately exposed in the gas space by the first insulating layer and the second insulating layer formed in a dot shape. .

In addition, the lower substrate 20 facing the upper substrate 30 has a phosphor layer of the upper substrate 30 by the main partition walls and the auxiliary partitions 25a and 25b for preventing the cross-talk of the cathode 40. It is formed so as to correspond to two columns of 56. That is, the cathode 40 is formed to have a width that can cover two rows of the phosphor layer 56, and the cathode 40 is formed on the upper surface of the cathode 40 so as to correspond to the phosphor layer 56 of the upper substrate 30. A secondary partition 25b is formed to protrude with a predetermined interval in a direction orthogonal to the main partition wall 25a and the cathode 40 which are formed as a.

In the case of such a color plasma display device, the signal processing can be performed by R, G, B, ..., which is the simplest method, and the cathode, that is, one scanning line is responsible for two rows of phosphor layers, thus extending the light emission time as much as possible. It can be effective. In addition, since the discharge cells formed by the two rows of the cathode, the anode, and the phosphor layer form a delta, calcination is also represented as a delta type. Therefore, the resolution and brightness are improved.

However, the barrier rib structure shown in FIGS. 5A and 5B is a well-shaped barrier rib which completely surrounds the discharge space, and thus, if the cell is simply surrounded by a rectangular barrier rib, a considerable time is required in the exhaust and gas injection process.

Accordingly, an object of the present invention is to provide a plasma display panel that can improve luminance by using a zigzag partition wall and forming a bus electrode on the partition wall.

1 is a perspective view showing a plasma display panel having a conventional stripe-type partition wall structure.

2 is a perspective view showing a plasma display panel having a conventional well-shaped partition wall structure;

3 is a perspective view showing a plasma display panel having a conventional delta partition structure.

4 is a plan view showing an electrode structure of the plasma display panel shown in FIG. 3;

5A and 5B show a conventional color plasma display panel.

6 is a cross-sectional view illustrating a delta plasma display panel according to an exemplary embodiment of the present invention.

FIG. 7 is a plan view showing an electrode structure of the plasma display panel shown in FIG. 6; FIG.

<Description of Symbols for Main Parts of Drawings>

10,30,50: upper substrate 12Y, 12Z, 52Y, 52Z: sustain electrode

12X, 52X: Address electrode 12a, 52a: Transparent electrode

12b and 52b bus electrodes 14 and 54 dielectric layers

16,56: protective film 18,20,58,76: lower substrate

22a, 22b: anode 24a, 24b, 24c, 60, 74: bulkhead

26,56,62: phosphor 34: narrow channel

40: cathode

In order to achieve the above object, the present invention provides a plasma display panel including discharge cells coated with red (R), green (G), and blue (B) phosphors, the rectangular discharge cells being disposed adjacent to each other in a delta type; And a channel for allowing the square discharge cells coated with phosphors of the same color to be interconnected, and a partition wall formed in a zigzag between the square discharge cell and the channel to separate the discharge cell from the channel.

Other objects and features of the present invention in addition to the above object will be apparent from the description of the embodiments with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 6 and 7.

FIG. 6 is a diagram illustrating a lower substrate of a PDP having a zig-zag-shaped partition wall according to an exemplary embodiment of the present invention.

Referring to FIG. 6, in the PDP according to the exemplary embodiment of the present invention, a partition 74 is formed in parallel with the address electrode 82X on the lower substrate 76 on which the address electrode 82X is formed. Phosphors (not shown) are applied to the surfaces of the lower substrate 76 and the partition wall 74. The phosphor is excited by ultraviolet rays generated during plasma discharge to generate visible light of any one of red, green, and blue. The partition wall 74 prevents the ultraviolet rays and the visible light generated by the discharge from leaking to the adjacent discharge cells.

Here, in the partition wall 74, one cell is surrounded by a stripe-shaped partition wall in a zigzag shape, and the pixel cells are connected to narrow channels to facilitate exhaust or gas injection. In addition, since it is higher than the wide part of the discharge start voltage in the narrow channel, it has the advantage of preventing cross-talk in the partition wall direction.

The zig-zag-shaped partition wall 74 thus formed increases the coating area of the phosphor to the maximum as compared with the conventional delta-shaped partition wall as well as increases the reflectance of the partition wall.

FIG. 7 is a cross-sectional view illustrating an electrode structure of the PDP shown in FIG. 6 in detail.

Referring to FIG. 7, the electrode structure of the PDP according to the example of the present invention is composed of two sustain electrodes 52Y and 52Z as in the conventional electrode structure. The sustain electrodes 52Y and 52Z are composed of a transparent electrode 52a made of a transparent electrode material for increasing the transmittance of visible light and a bus electrode 52b for lowering the high electrical resistance of the transparent electrode 52a. Since the sustain electrodes 52Z and 52Y are symmetrically positioned in all pixel cells, unlike the other structure, the bus electrode 52b is positioned at the center of the transparent electrode 52a, and the bus electrode 52b emits visible light. In order to prevent the brightness from decreasing, the bus electrode 52b is placed on the partition wall to prevent the blocking of visible light.

As described above, the plasma display panel according to the present invention can prevent the blocking of visible light by placing a bus electrode on the partition wall, thereby improving luminance. In addition, the stripe-shaped partition wall is formed in a zigzag shape, so that the coating area of the phosphor is increased, and exhaustion and gas injection can be made smooth.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (3)

A plasma display panel in which discharge cells coated with red (R), green (G) and blue (B) phosphors are arranged in a delta type, Square discharge cells adjacently arranged in a delta type, A channel for interconnecting the square discharge cells coated with phosphors of the same color; And a partition wall formed in a zigzag between the rectangular discharge cell and the channel to separate the discharge cell and the channel. The method of claim 1, And a discharge gas is injected into the rectangular discharge cells through the channel. The method of claim 1, And a bus electrode of the upper substrate formed in the discharge cell is positioned on the partition wall.