KR20070006511A - Plasma display panel and plasma display device - Google Patents

Abstract

A plasma display panel and a plasma display device are provided to promote plasma discharge in a surface discharge structure using transparent electrodes and bus electrodes by changing only a shape of an end of each of the transparent electrodes. A plasma display panel includes two kinds of sustain electrodes which are formed alternately in longitudinal and lateral directions. The sustain electrodes include bus electrodes formed in the lateral direction, transparent electrodes(321,327), and branch electrodes(331,337). The bus electrodes are electrically connected with one end of each of the transparent electrodes. The other end of each of the transparent electrodes is directed to a center of discharge cells. Each of the transparent electrodes includes one side having wide width. Each of the branch electrodes includes one side having narrow width. A gap between the transparent electrodes is enlarged from left and right sides to a center of a discharge cell. The branch electrodes are projected in comparison with the transparent electrodes.

Description

Plasma display panel and plasma display device

1 is a schematic plan view showing the structure of a sustain electrode in a discharge cell in one embodiment of a conventional surface discharge type plasma display panel.

2 and 5 are perspective cross-sectional views showing a panel discharge cell structure in two other embodiments of the present invention.

3 and 4 are schematic plan views showing the structure of the discharge cell sustaining electrode in another embodiment of the present invention.

* Explanation of symbols for the main parts of the drawings

110: upper substrate 125,129,425,429: bus electrode

121,127,321,327,421,427: transparent electrode 210: lower substrate

130,240; Dielectric layer 140: protective layer

230, 530: bulkhead 331, 337, 431, 437: branch electrode

The present invention relates to a plasma display panel and a plasma display device, and more particularly, to the shape and arrangement of electrodes in a panel of the plasma display device.

Plasma display panels are formed by forming electrodes on two opposing substrates, overlapping them at regular intervals, injecting a discharge gas therein, and sealing the plasma display panel (PDP). Refers to a flat panel display device. The plasma display device is formed by forming a plasma display panel and installing elements necessary for screen realization such as a driving circuit connected to each electrode of the panel.

In the plasma display panel, many pixels for displaying a screen are arranged in a matrix form. In the plasma display panel, each pixel is driven in a manner of simply applying a voltage to an electrode, that is, a passive matrix method, without an active element for driving the pixel. The plasma display panel may be classified into a direct current type and an alternating current type according to the shape of the voltage signal for driving each electrode, and may be divided into an opposing type and a surface discharge type according to the arrangement of the two electrodes to which the sustain discharge voltage is applied.

In the case of the alternating current type, since the electrode is covered with the dielectric layer, it naturally has a capacitance, the current flowing through the electrode is limited, and the electrode is easily protected from the ion shock during discharge. As a result, the electrode lifetime is also long.

In the case of the surface discharge type, since the two electrodes for sustain discharge are on the same side, a high discharge voltage is required compared to the distance between the electrodes. On the other hand, when the distance between the electrodes is approached to lower the discharge voltage, the discharge may occur substantially only in a limited portion between the electrodes, thereby lowering the visible light generation efficiency and decreasing the luminance.

1 is a schematic plan view showing the structure of a sustain electrode in a discharge cell in one embodiment of a conventional surface discharge type plasma display panel. The sustain electrode includes bus electrodes 125 and 129 formed by direct jacks (zigzag) so as to overlap the transverse partition walls, and transparent electrodes 121 and 127 that overlap the bus electrodes and extend toward the center of the discharge cell. The sustain electrode includes scan scan electrodes and common sustain electrodes that face each other in one cell. The gap between the transparent electrode 121 of the scan sustain electrode and the transparent electrode 127 of the common sustain electrode is constant and spaced apart by a short distance to facilitate the discharge. Ideally, in this arrangement, the discharge is triggered at the gap portion between the transparent electrodes 121 and 127 and diffused toward the partition wall along the transparent electrode surface, so that the discharge is performed in a region corresponding to the discharge cell. However, in reality, the partition wall of the discharge cell may interfere with the diffusion of the discharge, and the discharge is often concentrated in a narrow space between the transparent electrodes.

On the other hand, in the stripe-type panel in which the partition walls are formed in parallel with the address electrodes, the partition walls are formed only on the left and right sides of one unit of discharge cells, and are not formed vertically. Therefore, there is a problem in that light emission does not occur so that the discharge is diffused between the upper and lower discharge cells so that the discharge cells are clearly distinguished. In addition, a substantial portion of the phosphor is laminated on the partition wall surface and contributes to light emission of the corresponding discharge cells during sustain discharge. In the stripe-type panel, the barrier surface on which the phosphor is stacked is not sufficient, so that the efficiency of light emission is lowered and the luminance is lowered. There was.

SUMMARY OF THE INVENTION An object of the present invention is to provide a plasma display panel and a plasma display device having a structure capable of increasing light emission efficiency compared to a conventional plasma display panel.

The present invention also facilitates the triggering of the plasma discharge only by changing the shape of the electrode without additional burden on the existing electrode forming process, and is not limited to a narrow area in the center of the discharge cell. And a plasma display device.

In order to achieve the above object, the plasma display panel of the present invention includes two types of sustain electrodes formed alternately vertically while extending laterally from the panel, and the sustain electrodes are formed laterally on the bus electrodes and up and down bus electrodes on each discharge cell. A transparent electrode protruding relatively wide from the center and a branch electrode protruding more than the transparent electrodes around the left and right in a relatively narrow width, wherein a gap between the upper and lower bus electrodes and the upper and lower transparent electrodes connected at the right and left of the discharge cell The plasma display device according to an embodiment of the present invention is provided with the plasma display panel together with the chassis and the circuit unit.

The plasma display panel of the present invention may have a partition wall formed so that the discharge cells are substantially hexagonal, and in particular, three color discharge cells forming one pixel may have a delta structure forming a triangle on the screen. have.

In the present invention, at least one opposing end portion of the upper and lower transparent electrodes formed in the discharge cell may have a concave curve or may have a V shape. In this case, the gap between the upper and lower transparent electrodes continues to widen toward the center. On the other hand, the opposite ends of the upper and lower transparent electrodes may have a step like a step to form a step gap from the left and right to the center of the discharge cell while maintaining a constant width of the interval, the gap may be discontinuously widened. Further, the gap between the transparent electrodes may be both continuously and discontinuously extending from the left and right to the center of the discharge cell.

According to the embodiment, when the gap between the upper and lower transparent electrodes of the present invention is largest in the center with respect to the left and right directions, the branch electrodes are positioned in the center and the transparent electrodes are not formed to a certain width to the left and right of the branch electrodes, and thus discharged. The transparent electrodes above and below the cell may form a state in which the left and right transparent electrodes are separated from each other.

In addition, in the present invention, the branch electrode formed in the discharge cell has one end connected to the bus electrode of the sustain electrode, and the other end is formed in a single shape toward the center of the discharge cell, or an end toward the center of the one-shaped branch crosses the discharge cell. It may be made of a T-shape having some extending branches again. The branch electrode formed in the discharge cell may be located in a recess in which the gap between the upper and lower transparent electrodes is widest in the discharge cell, and at least one branch electrode may be formed in the discharge cell, and the branch electrode formed may be at least left and right. It protrudes more than the surrounding transparent electrode.

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

2 is a perspective cross-sectional view showing a panel discharge cell structure in one embodiment of the present invention. The address electrodes 220 are vertically arranged side by side on the lower substrate 210 that forms the rear surface of the panel. A dielectric layer 240 is formed over the entire surface of the address electrode 220. The partition wall 230 is formed on the dielectric layer 240. The partition wall 230 forms a hexagonal discharge cell connected through a narrow channel while being bent in a longitudinal direction as compared with the stripe type.

The address electrode 220 passes through the narrow channel and passes through the center portion of the hexagonal discharge cells above and below the channel. In the portion passing through the discharge cell, the width of the address electrode can be widened to facilitate address discharge.

Although not shown, a phosphor layer (not shown) is stacked on the sidewalls of the barrier rib and the inner surface of the lower substrate. The phosphor layer may be laminated through printing, and the patterning of the phosphor layer may be directly performed through printing or may be performed by photolithography after lamination through printing or the like.

In the upper substrate 110 forming the front surface of the panel, transparent electrodes 121 and 127, bus electrodes 125 and 129, and branch electrodes of the sustain electrodes are formed on the inner surface. Referring to FIG. 3, the bus electrodes 125 and 129 are formed to overlap the upper two side portions and the lower two side portions of the hexagonal discharge cell in which the horizontally formed angles in a row are arranged in the upper and lower ends, and the bus of the scan sustain electrode is formed. The electrode 125 and the bus electrode 129 of the common sustain electrode are alternately positioned in the vertical direction of the screen.

The branch electrodes 331 and 337 and the transparent electrodes 321 and 327 both extend from the bus electrodes 125 and 127 toward the center of the discharge cell in the vertical direction. The transparent electrodes 321 and 327 have a curved concave end edge of two types of transparent electrodes facing each discharge cell.

In the present embodiment, the branch electrodes 331 and 337 have a T-shape and are formed in the center portion in the left and right directions of the discharge cell, and no transparent electrode is formed around the discharge electrodes. Accordingly, the upper and lower transparent electrodes 321 and 327 are all divided into a left portion and a right portion. In the present exemplary embodiment, the upper and lower transparent electrodes 321 and 327 are divided into left and right portions, but according to the exemplary embodiment, the upper and lower transparent electrodes 321 and 327 may have portions overlapping with the upper and lower branch electrodes.

A portion extending left and right at the central end of the upper and lower branch electrodes 331 and 337 causes the upper and lower branch electrodes 331 and 337 to have a narrow gap between the sustain electrodes in a predetermined section in the left and right directions. Can be formed. If the gap between the sharp left and right end portions of the transparent electrodes 321 and 327 toward the center is smaller than the gap between the upper and lower branch electrodes 331 and 337, the sustain discharge may be triggered first at these sharp portions.

In any case, the discharge cells are discharged before the narrow gap between the left and right ends of the transparent electrodes 321 and 327 and the upper and lower branch electrodes 331 and 337 is wider than the wide gap between the transparent electrodes 321 and 327.

The charged particles in the space formed by the discharge have a potential required for the discharge between the transparent electrodes 321 and 327 in the periphery thereof, so that the space discharge is performed even in the central portion where the gap between the transparent electrodes is wide. That is, the discharge is induced in a portion where the gap between the transparent electrodes is wide, causing a phenomenon that the discharge space is diffused. Since the separation distance between the two transparent electrodes 321 and 327 is wide at the center, when the discharge is performed in this space, the light emitting efficiency of the discharge cell may be increased and the luminance may be improved.

At this time, since the partition wall of the present embodiment is formed with a hexagonal discharge cell having a hexagonal shape close to a circle, the partition wall of the present embodiment is less disturbed by the partition wall when diffused to the periphery of the discharge in the center of the discharge cell. The discharge spread to the surroundings becomes a kind of long gap discharge.

In addition, in the present embodiment, the discharge can be made faster in a portion where the gap between the transparent electrodes 321 and 327 is wider than when the branch electrodes 331 and 337 are not provided.

Once the sustain discharge is made in the wide gap between the transparent electrodes, the sustain discharge continues in the narrow gap and the opposing portion between the branch electrodes, but the discharge distance between the sustain electrodes increases as a whole. Discharge efficiency.

Referring to FIG. 2 again, a dielectric layer 130 and a protective layer 140 are formed on a substrate on which a sustain electrode made of a transparent electrode, a branch electrode, and a bus electrode as shown in FIG. 3 is formed. The dielectric layer 130 is usually made of glass material, and the protective layer 140 is made of magnesium oxide (MgO).

In the arrangement of the barrier rib and the electrode having such a configuration, the discharge cells are shifted by about half pitch between the adjacent rows of the discharge cells vertically, and the address electrodes are arranged every half pitch of the discharge cells laterally. The scan sustain electrode and the address electrode related to the address discharge are not the same in the two discharge cells. Therefore, independent driving for each discharge cell of the plasma display panel can be performed. At this time, the delta configuration of the pixel which arrange | positions the discharge cell for each RGB color body so that it may become triangular on a plane is easy.

In the delta-type pixel structure of the hexagonal discharge cells, the partition wall partitioning the discharge cells is increased compared to the pixel structure in which the partition walls have a stripe shape, so that the sidewall phosphor coating area may be increased to increase luminous efficiency.

When the electrodes and the partition structure of the panel are formed on the upper and lower substrates, a sealing material is provided at the periphery, aligned, and sealed. After sealing, the plasma display panel is formed through exhaust, injection of a discharge gas, and sealing.

4 is a schematic plan view showing a discharge cell sustaining electrode structure in another embodiment of the present invention.

In the embodiment of FIG. 4, the bus electrodes 425 and 429 of the sustain electrode are formed to overlap along the partition wall formed by the same jack as compared with FIG. 3. In general, the bus electrodes 425 and 429 are formed in a transverse direction such as a partition wall. Here, the two types of sustain electrodes are alternately positioned up and down.

The transparent electrodes 421 and 427 overlap one of the two types of bus electrodes 421 and 427 in the region within each discharge cell and the other ends protrude to the center of the discharge cell. The two types of transparent electrodes 421 and 427 are formed at the center of the discharge cell. While facing each other, a gap is formed. However, unlike in FIG. 3, the opposite end sides of the two transparent electrodes 421 and 427 are concave as a whole, but by forming a step, a central concave portion that is discontinuously is formed. Since a predetermined width is not formed to the left and right of the branch electrodes, the two transparent electrodes are divided into left and right portions (421 and 427).

The branch electrodes 431 and 437 are formed in a T-shape as shown in FIG. 3 so that the portions facing the upper and lower branch electrodes 431 and 437 in the center form a predetermined section to the left and right.

In the embodiment of FIG. 3 or 4, the concave degree of the two end sides of the transparent electrode is discharged by maximizing the gap between the two transparent electrode portions at the same time while the diffusion of the sparks is rapidly induced at the left and right ends of the transparent electrode of the discharge. Is determined to increase. In general, the larger the concave, the larger the center gap and the higher the discharge efficiency. However, the diffusion into the center of the discharge tends to be delayed in time. Therefore, the concave determination is made at a trade off point that satisfies these two conditions. .

Meanwhile, in the present exemplary embodiments, since the branch electrodes are formed in the concave portion of the upper and lower transparent electrodes as a whole, and the branch electrodes are formed at the large gap between the transparent electrodes, charged particles may be supplied at the initial stage of each sustain discharge even in the center of the discharge cell. have. Therefore, in the present invention, discharge diffusion is not significantly influenced by the degree to which the transparent electrode is concave compared with the case where there is no branch electrode. As a result, it is possible to focus on increasing the discharge efficiency by forming the recessed portion of the transparent electrode more rapidly without considering the diffusion of the discharge.

FIG. 5 is a perspective view showing a partition and electrode structure of another embodiment of the present invention similar to FIG.

In the lower substrate 210 forming the rear surface of the panel, the address electrodes 220 are vertically formed side by side. A dielectric layer 240 is formed over the entire surface of the address electrode 220. The partition wall 530 is formed on the dielectric layer 240. The other components are formed in the same manner as in FIG. Are separated one by one.

The address electrode 220 alternates in the vertical direction and passes through the partition wall forming the two sides of the hexagon and the central portion of the hexagonal discharge cells above and below the partition wall. In the portion passing through the discharge cell, the width of the address electrode can be widened to facilitate address discharge.

In the upper substrate 110 forming the front surface of the panel, transparent electrodes 121 and 127 and bus electrodes 125 and 129 of the sustain electrodes are formed on the inner surface. Although not shown, a branch electrode is formed of a metal conductive layer such as a bus electrode. Since the branch electrode covers the window of the front substrate that emits visible light, the branch electrode is formed to be as thin as possible, and is preferably formed to be thinner than the width of the bus electrode as well as the transparent electrode. In general, a transparent electrode layer is first formed and patterned to form a transparent electrode, and then a bus electrode and a branch electrode are formed on the substrate.

Referring to FIG. 3, the bus electrodes 125 and 129 are formed so as to overlap the upper two side portions and the lower two side portions of the hexagonal discharge cell in which the horizontally formed angles in a row are arranged on the upper and lower ends. The bus electrode 125 and the bus electrode 129 of the common sustain electrode are alternately positioned in the vertical direction of the screen.

According to the present invention, in the surface discharge type electrode structure using the transparent electrode and the bus electrode of the conventional panel in the plasma display device, the plasma discharge can be easily triggered by only changing the shape of the end side of the transparent electrode forming the discharge gap between the sustain electrodes. The discharge start voltage can be reduced.

In addition, in the present invention, it is possible to facilitate the start of the discharge and to maintain the discharge in a considerable area of the discharge cell, not limited to a narrow area in the center on the basis of the discharge cell up and down direction, thereby increasing the discharge efficiency and the luminance.

In addition, when the discharge cell partition wall is formed substantially in a hexagon, the partition surface is increased compared to the stripe shape, thereby increasing the amount of phosphor applied, thereby increasing the luminous efficiency of converting ultraviolet rays into visible light of each color, thereby increasing the luminance. In addition, the bus electrode is formed to overlap with the partition wall, thereby increasing the aperture ratio of the discharge cells, and is easy to achieve a form capable of independent driving for each discharge cell.

Claims (11)

Two substrates spaced apart from each other to form a sealed space together with a surrounding sealing material, a partition wall partitioning the space between the two substrates to limit discharge cells, a driving electrode for image display, a discharge gas filling the space, In a plasma display panel comprising a phosphor layer laminated on at least a portion of the substrate and the partition wall surface, As a part of the driving electrode and provided in the transverse direction while extending in the longitudinal direction of the two types of sustain electrode, The sustain electrode includes a horizontally formed bus electrode, a top and bottom relatively wide transparent electrode, and a top and bottom, wherein one end of each of the discharge cells is electrically connected to the top and bottom bus electrodes and the other end faces the center of the discharge cell. A branch electrode having a relatively narrow width at least on one side thereof; The upper and lower transparent electrodes are concave at least one of the other end portions facing each other such that a gap between the upper and lower transparent electrodes is widened from the left and right to the center of the discharge cell, and the branch electrodes are more than the transparent electrodes on the left and right periphery. Plasma display panel, characterized in that protruding. The method of claim 1, And wherein the discharge cells are substantially hexagonal and the partitions are formed such that each portion of the hexagon is at an upper and lower end thereof. The method of claim 2, And the discharge cells are arranged in a delta so that three kinds of triangles emitting visible light having different colors form a triangle. The method of claim 3, wherein And the bus electrode is disposed such that the hexagonal discharge cells overlap the partition wall. The method of claim 2, And the bus electrode is disposed such that the hexagonal discharge cells overlap the partition wall. The method of claim 1, The concave end portion is formed in a V shape by two line segments. The method of claim 1, And the concave end portion is curved. The method of claim 1, And the concave end portion has a stepped interval. The method of claim 1, And wherein the branch electrode is formed of one of an I-shape or a T-shape based on an end shape facing the center of the discharge cell. The method of claim 1, And the branch electrode is made of the same metal layer as the bus electrode. The plasma display panel of any one of claims 1 to 10, A circuit unit configured to apply a signal to a driving electrode of the panel; And a chassis for supporting the panel and the circuit portion.

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