KR100501981B1 - Plasma display panel - Google Patents

Abstract

The present invention relates to a plasma display panel capable of improving display quality.

The plasma display panel according to the present invention is a plasma display panel in which a plurality of address electrodes are arranged to intersect alternately arranged scan electrodes and sustain electrodes and discharge cells are formed on the crossing areas, wherein the address electrodes have a constant width. And a protrusion protruding from the address electrode around the opposite side of the divided address electrode.

By such a configuration, the distance between the upper and lower address lines and the left and right address lines can be equally formed to uniformly form the partition wall, and stably generate address discharge in the vicinity of the center of the panel, thereby improving display quality.

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel capable of improving display quality.

Recently, there is a growing interest in flat panel displays that can reduce the weight and volume of cathode ray tubes. Such flat panel displays include liquid crystal displays, plasma display panels (PDPs), field emission displays, and electro-luminescence.

Among such flat panel display devices, the plasma display panel emits phosphors by 147 nm ultraviolet rays generated when the He + Xe, Ne + Xe or He + Xe + Ne gas is discharged to display images and video including characters or graphics. . The plasma display panel is not only thin and large in size, but also recently, due to technology development, the plasma display panel provides greatly improved image quality.

In particular, the three-electrode AC surface discharge type plasma display panel accumulates wall charges using a dielectric layer during discharging, thereby lowering the voltage required for discharging, and has advantages of low voltage driving and long life because it protects the electrodes from sputtering of plasma.

1 is a perspective view showing a discharge cell structure of a typical three-electrode AC surface discharge type plasma display panel.

Referring to FIG. 1, a discharge cell of a three-pole current alternating surface discharge plasma display panel is formed on a scan electrode (Y) and a sustain electrode (Z) formed on an upper substrate (10), and a lower substrate (18). The address electrode X is provided.

Each of the scan electrode Y and the sustain electrode Z has a line width smaller than that of the transparent electrodes 12Y and 12Z and the transparent electrodes 12Y and 12Z and is formed on one side edge of the transparent electrode. 13Z). Indium tin oxide (ITO) is generally used as a material of the transparent electrodes 12Y and 12Z. As the material of the metal bus electrodes 13Y and 13Z, a metal such as chromium (Cr) is usually used. The metal bus electrodes 13Y and 13Z serve to reduce voltage drop caused by the transparent electrodes 12Y and 12Z having high resistance. An upper dielectric layer 14 and a passivation layer 16 are stacked on the upper substrate 10 on which the scan electrode Y and the sustain electrode Z are formed. In the upper dielectric layer 14, charged particles generated by gas discharge ionization gas (plasma) are accumulated. The protective layer 16 protects the upper dielectric layer 14 from sputtering of charged particles generated during gas discharge and increases the emission efficiency of secondary electrons. As the bottom film 16, magnesium oxide (MgO) is usually used. The address electrode X is formed in the direction crossing the scan electrode Y and the sustain electrode Z. The lower dielectric layer 22 and the partition wall 24 are formed on the lower substrate 18 on which the address electrode X is formed.

The phosphor layer 26 is formed on the surfaces of the lower dielectric layer 22 and the partition wall 24. The partition wall 24 is formed to be parallel to the address electrode X to physically distinguish the discharge cells, and prevent ultraviolet rays and visible light generated by the discharge from leaking to the adjacent discharge cells. The phosphor layer 26 is emitted by ultraviolet rays generated during gas discharge to generate visible light of any one of red, green, and blue. An inert mixed gas such as He + Xe, Ne + Xe or He + Xe + Ne for discharging is injected into the discharge space provided between the upper and lower substrates 10 and 18 and the partition wall 24.

2 is a frame diagram illustrating a driving method of a general plasma display panel.

Referring to FIG. 2, such a three-electrode AC surface discharge type plasma display panel is driven by dividing one frame into several subfields having different emission counts in order to realize gray levels of an image. When the image is to be displayed in 256 gray levels, the frame period (16.67 ms) corresponding to 1/60 second is divided into eight subfields. Each of the eight subfields is further divided into a reset period for uniformly causing discharge, an address period for selecting a Banggen cell, and a sustain period for implementing gray scale according to the number of discharges. The reset period and the address period of each subfield are the same for each subfield, while the sustain period and the number of discharges thereof are 2 ⁿ in each subfield (where n = 0, 1, 2, 3, 4, 5, 6, 7) is increased in proportion. In this way, gray levels can be implemented by using a combination of subfields having different sustain periods.

The driving method of the plasma display panel is to turn on the discharge cells to be sustained discharged in the sustain period in the address period after turning off the full screen in the reset period. Subsequently, in the sustain period, an image is displayed by sustaining (sustaining) the discharge cells selected by the address discharge.

The plasma display panel driving method is divided into a single scan method and a dual scan method according to a scan method.

3 is a diagram illustrating address lines of a plasma display panel driven by a single scan method.

Referring to FIG. 3, when the address lines are not divided up and down, the scan lines, which are not shown, are sequentially driven from the first to the last to drive an address discharge. Such a single scan type plasma display panel has a problem in that high-speed driving is difficult due to a relatively long address period. If the address period becomes longer during the predetermined period of one frame, the sustain period is reduced relatively, and the display quality is degraded. In order to make up for such drawbacks, a dual scan method is proposed in which the address lines are divided and driven up and down.

4A and 4B schematically illustrate a plasma display panel driven in a dual scan method.

4A and 4B, a plasma display panel driven by a dual scan method includes a transparent electrode included in an address line X having lines separated up and down, and scan electrodes Y and sustain electrodes Z not shown. 12Y and 12Z, and metal bus electrodes formed at one edge of the transparent electrodes 12Y and 12Z.

The plasma display panel displays a screen by selectively generating discharges by addressing discharges on an electrode structure of a matrix. In order to express a natural moving image in a large-screen plasma display panel, the addressing time must be shortened, so the scan time is reduced by using the dual scan method. The dual scan method separates the address lines up and down, and simultaneously drives the upper and lower scan lines in sequence to cause address discharge, thereby reducing the address period to 1/2 compared to the single scan method, thereby enabling high-speed driving and displaying a large screen. have.

In the plasma display panel using the dual scan driving method, since the address lines are formed by dividing the address lines up and down, the pattern of the partition wall is unevenly formed during the sand blast process. In detail, as shown in FIG. 4B, an address line of a typical plasma display panel using a dual scan method has a distance d2 between adjacent left and right address lines rather than an interval d1 between upper and lower address lines. ) Is wider.

Differences in electrostatic repulsion due to the difference in capacitance of the address lines near the center portion 30 of the panel, that is, the address lines are separated up and down, when the partition wall is formed by the sand blast method of spraying abrasive powder when the distance between the address lines is different The barrier ribs are formed unevenly. If the barrier ribs are formed unevenly, the address discharge for selecting the cells is unstable and the display quality is degraded. In addition, the gap between the address lines in the center portion 30 of the panel causes unstable discharge from the scan electrodes, resulting in a difference in luminance between the portion of the panel center portion 30 and other portions of the panel. There is a disadvantage in that the display quality is poor due to the appearance of lines.

Accordingly, there is a need for a plasma display panel capable of improving display quality while using a dual scan driving method.

Accordingly, an object of the present invention is to provide a plasma display panel capable of improving display quality.

The plasma display panel according to the present invention is characterized by having a plurality of protrusions protruding from the address electrode.

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The plasma display panel according to the present invention is characterized in that the distance between the adjacent protrusions is the same.

The plasma display panel according to the present invention is characterized in that the distance between the protrusions facing up and down is equal to the distance between the protrusions parallel to each other.

The protrusion of the plasma display panel according to the present invention is characterized by the shape of a rectangle.

The protrusion of the plasma display panel according to the present invention is characterized by having a spherical shape.

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

Hereinafter, a plasma display panel according to the present invention will be described in detail with reference to FIGS. 5 to 7.

5 is a schematic view of a plasma display panel according to a first embodiment of the present invention.

Referring to FIG. 5, a plasma display panel driven in a dual scan method according to a first embodiment of the present invention includes an address line X having lines separated up and down, a scan electrode Y and a sustain electrode (not shown). Z). In the dual scan method, the address lines are divided up and down, and the upper and lower scan lines are sequentially driven at the same time to generate an address discharge.

The plasma display panel according to the first embodiment of the present invention protrudes the address lines in the left and right directions up and down symmetrically in the vicinity of the center portion 130 of the panel.

The protrusion 140 is formed to form the same distance between the upper and lower address lines and the left and right address lines in the vicinity of the center portion 130 of the panel to make the capacitance between the address lines the same. Through such a structure, the partition wall can be uniformly formed when the partition wall is formed by the sand blast method. By forming the barrier ribs uniformly, the address discharge can be stably generated. In addition, by forming a wide area of the address lines in the panel center portion 130, discharge to the scan electrodes can be more stably generated, so that the luminance of the panel center portion 130 and the other portions of the panel can be the same. Can improve.

6 is a schematic view of a plasma display panel according to a second embodiment of the present invention.

Referring to FIG. 6, a plasma display panel driven in a dual scan method according to a second embodiment of the present invention includes an address line X having lines separated up and down, a scan electrode Y and a sustain electrode (not shown). Z). In the dual scan method, the address lines are divided up and down, and the upper and lower scan lines are sequentially driven at the same time to generate an address discharge.

In the plasma display panel according to the second embodiment of the present invention, the protruding portion 140 protruding the address line in the vicinity of the center portion 130 of the panel forms an area of the address lines in a rectangular shape symmetrically.

The protruding portion 140 forms a wide area of the address lines in the vicinity of the center portion 130 of the panel to form the same distance between the upper and lower address lines and the left and right address lines. The same spacing between the address lines is formed to form the same capacitance between the address lines. Through such a structure, the partition wall can be uniformly formed when the partition wall is formed by the sand blast method. By forming the barrier ribs uniformly, the address discharge can be stably generated. In addition, by widening the area of the address lines of the panel center portion 130, discharge to the scan electrodes can be more stably generated, so that the luminance of the panel center portion 130 and the other portions of the panel can be the same, thereby improving display quality. You can.

FIG. 7 is a schematic view of a plasma display panel according to a third embodiment of the present invention.

Referring to FIG. 7, a plasma display panel driven in a dual scan method according to a third embodiment of the present invention includes an address line X having lines separated up and down, a scan electrode Y and a sustain electrode (not shown). Z). In the dual scan method, the address lines are divided up and down, and the upper and lower scan lines are sequentially driven at the same time to generate an address discharge.

In the plasma display panel according to the third embodiment of the present invention, the protruding portion 140 protruding the address line in the vicinity of the center portion 130 of the panel forms a wide area of the address lines in a symmetrical shape.

The protruding portion 140 forms a wide area of the address lines in the vicinity of the center portion 130 of the panel to form the same distance between the upper and lower address lines and the left and right address lines. The same spacing between the address lines is formed to equalize the capacitance between the address lines. Through such a structure, the partition wall can be uniformly formed when the partition wall is formed by the sand blast method. By forming the barrier ribs uniformly, the address discharge can be stably generated. In addition, by widening the area of the address lines of the panel center portion 130, discharge to the scan electrodes can be more stably generated, so that the luminance of the panel center portion 130 and the other portions of the panel can be the same, thereby improving display quality. You can.

As described above, in the plasma display panel according to the exemplary embodiments of the present invention, the address lines protrude from the center of the panel of the transparent electrodes formed on the upper plate in a dual scan method in which the address lines are divided up and down to widen the area. By doing this, the distance between the upper and lower address lines and the left and right address lines are equally formed. Through this structure, the barrier ribs can be uniformly formed, and address discharge can be stably generated near the center of the panel, thereby improving display quality.

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.

1 is a perspective view showing a discharge cell structure of a typical three-electrode AC surface discharge type plasma display panel.

2 is a frame diagram illustrating a driving method of a general plasma display panel.

3 is a diagram illustrating address lines of a plasma display panel driven by a single scan method.

4A and 4B schematically illustrate a plasma display panel driven in a dual scan method.

5 is a schematic view of a plasma display panel according to a first embodiment of the present invention.

6 is a schematic view of a plasma display panel according to a second embodiment of the present invention.

FIG. 7 is a schematic view of a plasma display panel according to a third embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

10: upper substrate 18: lower substrate

Y: scan electrode Z: sustain electrode

X: address electrode 12Y, 12Z: transparent electrode

13Y, 13Z: metal bus electrode 14: upper dielectric layer

16: protective film 22: lower dielectric layer

24: partition 26: phosphor layer

30,130: Center panel

Claims (6)

A plasma display panel in which a plurality of address electrodes are arranged to intersect alternately arranged scan electrodes and sustain electrodes, and discharge cells are formed on the crossing areas. And the address electrode has a constant width and is divided up and down, and includes a protrusion protruding from the address electrode around an opposite side of the divided address electrode. The method of claim 1, And a plurality of protrusions protruding from the address electrode. The method of claim 2, And the spacing between the adjacent protrusions is the same. The method of claim 3, wherein And a distance between the protrusions facing up and down and the distance between the protrusions parallel to each other. The method of claim 4, wherein And the projecting portion has a rectangular shape. The method of claim 4, wherein And the protrusion is spherical in shape.