KR100578801B1 - Plasma display panel - Google Patents

Abstract

The present invention relates to a plasma display panel for expanding a main discharge region in which strong sustain discharge occurs in a discharge cell to increase discharge intensity and panel efficiency, comprising: first and second substrates; Address electrodes formed on the first substrate; A partition wall disposed in a space between the first substrate and the second substrate to partition the discharge cells and the non-discharge region; Sustain electrodes formed on the second substrate; A floating electrode disposed at an arbitrary distance from the sustain electrode, wherein the non-discharge region is disposed in an area surrounded by a horizontal axis and a vertical axis passing through the center of each discharge cell, and the sustain electrode has a recess in the center of the opposing surfaces facing each other. A plasma display panel includes a scan electrode and a common electrode, and the floating electrode is positioned at random intervals between the scan electrode and the common electrode between the recesses.

Plasma, display, address electrode, scan electrode, common electrode, floating electrode, recess, discharge cell, partition wall

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

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

FIG. 2 is a partial plan view illustrating the assembled state of FIG. 1. FIG.

3 is a partial cross-sectional view showing the assembled state of FIG.

4 is a partially enlarged view of FIG. 2.

5 is a partial plan view of a plasma display panel according to a second embodiment of the present invention.

6 is a partially exploded perspective view showing an AC plasma display panel according to the prior art.

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 discharge intensity and panel efficiency by extending a main discharge region in which strong sustain discharge occurs in a discharge cell by improving the shape of the sustain electrode.

In general, a plasma display panel (PDP) is a display device for realizing an image by exciting phosphors by vacuum ultraviolet rays caused by gas discharge occurring in a discharge cell. It is attracting attention as the next generation thin display device.

6 is a partially exploded perspective view showing an AC PDP having a three-electrode surface discharge structure according to the prior art. Referring to the drawings, an address electrode 3, a partition 5, and a fluorescent layer 7 are formed on a rear substrate 1, and a scan electrode 11 and a common electrode 13 are formed on a front substrate 9. The sustain electrode 15 is formed. The scan electrode 11 and the common electrode are respectively transparent electrodes 11a and 13a having excellent light transmittance, such as indium tin oxide (ITO), and metal bus electrodes 11b, which complement conductivity of the transparent electrodes 11a and 13a. 13b).

The address electrode 3 and the storage electrode 15 are respectively covered with a first dielectric layer 17 and a second dielectric layer 19, and an MgO passivation layer 21 is positioned on the surface of the second dielectric layer 19. The discharge space where the address electrode 3 and the sustain electrode 15 intersect serves as one discharge cell, and the inside of the discharge cell is filled with discharge gas (mainly Ne-Xe mixed gas).

By the above-described configuration, an address voltage Va is applied between the address electrode 3 and the scan electrode 11 to select a discharge cell in which light emission will occur through address discharge, and the scan electrode 11 of the selected discharge cell and When the sustain voltage Vs is applied between the common electrodes 13, plasma discharge, that is, sustain discharge, occurs in the discharge cell. Then, vacuum ultraviolet rays are emitted from the excitation atoms of Xe produced during sustain discharge, and the vacuum ultraviolet rays excite the fluorescent film 7 to emit visible light, thereby making a predetermined display.

In the PDP operating as described above, the sustain discharge starts from the discharge gap G between the scan electrode 11 and the common electrode 13 and emits a strong vacuum ultraviolet ray at the beginning of the start, and then diffuses toward the outer portion of the discharge cell. As the vacuum ultraviolet light intensity gradually decreases, the discharge ends. However, in the PDP having the above-described structure, the scan electrode 11 and the common electrode 13 are disposed to face each other with a constant discharge gap G interposed at the center of the discharge cell, and the partition wall 5 is a stripe pattern along the address electrode direction. And discharge cells connected in the direction of the address electrode.

As a result, the conventional PDP has a limitation in increasing the discharge intensity due to the narrow main discharge region in which strong vacuum ultraviolet rays are emitted to the discharge cell region, and the shape of the discharge cell, that is, the partition wall 5, also does not consider discharge efficiency. Therefore, the discharge efficiency and the PDP efficiency (luminance ratio to power consumption) are low.

Therefore, the present invention is to solve the above problems, an object of the present invention is to improve the shape of the sustain electrode to expand the main discharge area where strong sustain discharge occurs in the discharge cell by increasing the discharge intensity and PDP efficiency plasma It is to provide a display panel.

In order to achieve the above object, the present invention,

First and second substrates, address electrodes formed on the first substrate, partition walls disposed in a space between the first substrate and the second substrate to partition the discharge cells and the non-discharge region, and located in respective discharge cells A fluorescent layer; and sustain electrodes formed on the second substrate; and floating electrodes disposed at random intervals from the sustain electrode, wherein the non-discharge region is in an area surrounded by a horizontal axis and a vertical axis passing through the center of each discharge cell. The sustain electrode includes a scan electrode and a common electrode having recesses in the centers of the opposite surfaces facing each other, and the floating electrodes provide a plasma display panel positioned at random intervals between the scan electrodes and the common electrode between the recesses. do.

The discharge cells are formed narrower as the widths of both ends located in the direction of the address electrode move away from the center of the discharge cell, and the depth measured from the top of the partition wall at both ends located in the direction of the address electrode is measured from the center of the discharge cell. The further away it is formed smaller.

The scan electrode and the common electrode may include a bus electrode formed so that a pair corresponds to an outer portion of each discharge cell, and a protruding electrode extending from the bus electrode toward the center of each discharge cell to face a pair. The rear end connected to the electrode has a shape in which the width gradually narrows toward the bus electrode.

The protruding electrode forms a recess in the center of the opposing surfaces facing each other, and the floating electrode is positioned at the center of the recess at an arbitrary distance from the protruding electrode. The floating electrode is independently connected to the outside and positioned independently in each discharge cell, and may be divided into two or more electrodes.

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

1 is a partially exploded perspective view of a plasma display panel according to a first exemplary embodiment of the present invention, and FIGS. 2 and 3 are partial plan views and partial cross-sectional views respectively illustrating an assembled state of FIG. 1.

Referring to the drawings, in the plasma display panel (hereinafter referred to as 'PDP') according to the present embodiment, the first substrate 2 and the second substrate 4 are disposed to face each other at random intervals, and the space between the two substrates is provided. Discharge cells 8R, 8G, 8B and non-discharge regions 10 partitioned by the partition wall 6 are provided.

First, address electrodes 12 are formed on an inner surface of the first substrate 2 along one direction (Y direction in the drawing), and cover the address electrodes 12 to cover the entire first inner layer of the first substrate 2. (14) is formed. For example, the address electrode 12 is formed in a stripe pattern and is positioned side by side with a neighboring address electrode 12 at a predetermined interval.

The partition wall 6 is disposed on the first dielectric layer 14 to partition the discharge cells 8R, 8G, and 8B and the non-discharge region 10. Here, the discharge cells 8R, 8G, and 8B are spaces in which gas discharge and light emission are intended to occur, and the non-discharge regions 10 mean areas or spaces in which gas discharge and light emission are not intended. For reference, the drawing shows an embodiment in which the discharge cells 8R, 8G, 8B and the non-discharge region 10 are each formed to have independent cell structures.

The partition wall 6 partitions the discharge cells 8R, 8G, and 8B along an address electrode direction (Y direction in the figure) and a direction crossing the address electrode (X direction in the figure), and each of the discharge cells 8R, 8G and 8B) are optimized in consideration of the diffusion form of the discharge gas during the sustain discharge.

The optimized structure of the discharge cells 8R, 8G, and 8B is a shape in which each portion of the discharge cells 8R, 8G, and 8B substantially minimizes the contribution to the sustain discharge and the brightness enhancement. Denotes a shape in which the widths of both ends positioned along the address electrode direction in each of the discharge cells 8R, 8G, and 8B become narrower as they move away from the center of the discharge cells 8R, 8G, and 8B.

That is, referring to FIG. 1, the width Wc at the center of the discharge cells 8R, 8G, and 8B is made larger than the width We at the end, and the width We at the end is the discharge cell 8R, The narrower the distance from the center of 8G, 8B). As a result, both ends of the discharge cells 8R, 8G and 8B have a trapezoidal shape, and the overall planar shape of each discharge cell 8R, 8G and 8B is octagonal.

And assuming that the virtual horizontal axis (H) and the vertical axis (V) passing through the center of each discharge cell (8R, 8G, 8B), the non-discharge area (10) in the area surrounded by the horizontal axis (H) and the vertical axis (V) ) Is located. Thus, in the above structure, four discharge cells (1) comprising a pair of discharge cells neighboring along the address electrode direction (Y direction in the drawing) and a pair of neighboring discharge cells along the direction crossing the address electrode (X direction in the drawing) One non-discharge area 10 is located between, ②, ③, and ④). In this case, the non-discharge region 10 absorbs heat from neighboring discharge cells 8R, 8G, and 8B to enhance heat dissipation characteristics of the PDP.

Accordingly, the partition wall 6 is formed so as to intersect the first partition member 6a in a direction parallel to the address electrode 12 and the first partition member 6a at a predetermined inclination angle. In the present embodiment, the second partition member 6b has an approximately X-shape between discharge cells neighboring along the address electrode direction. In addition, red, green, or blue phosphors are applied to each of the discharge cells 8R, 8G, and 8B to form the fluorescent layers 16R, 16G, and 16B.

Referring also to FIG. 3, measured from the top of the partition 6 at both ends of the discharge cell 8R located along the address electrode direction (Y direction in the figure), ie from the top of the second partition member 6b in the figure. The depth becomes smaller as it moves away from the center of the discharge cell 8R. That is, the depth De at the end of the discharge cell 8R is smaller than the depth Dc at the center portion, and the depth De at the end gradually becomes shallower as it moves away from the center of the discharge cell 8R. The depth characteristics of the discharge cells 8R are equally applied to the green discharge cells 8G and the blue discharge cells 8B.

On the other hand, the inner surface of the second substrate 4 facing the first substrate 2 is formed of the scan electrode 18 and the common electrode 20 along the direction (X direction in the drawing) that intersects the address electrode 12. The sustain electrode 22 is formed, and the floating electrode 24 is formed between the scan electrode 18 and the common electrode 20 in each discharge cell 8R, 8G, 8B. The second dielectric layer 26 and the MgO protective layer 28 are disposed on the entire inner surface of the second substrate 4 while covering the sustain electrodes 22 and the floating electrode 24.

The scan electrode 18 and the common electrode 20 are bus electrodes 18a and 20a provided in a stripe pattern corresponding to the outer portions of the respective discharge cells 8R, 8G and 8B, and the bus electrodes 18a and 20a. It extends toward the center part of each discharge cell 8R, 8G, 8B, and consists of the protruding electrodes 18b and 20b which a pair opposes.

In the present embodiment, the protruding electrodes 18b and 20b form a concave portion 30 at the centers of opposite surfaces facing each other so that the pair of protruding electrodes 18b and 20b are formed at the outer edges of the discharge cells 8R, 8G and 8B. The discharge gap G1 is disposed to be interposed therebetween. In addition, the protruding electrodes 18b and 20b have a shape in which the rear ends of the protruding electrodes 18a and 20a are narrowed toward the bus electrodes 18a and 20a, so that the rear ends of the protruding electrodes 18b and 20b are discharge cells ( 8R, 8G, 8B) shape.

The floating electrode 24 is positioned at an arbitrary distance from the protruding electrodes 18b and 20b between the recesses 30 provided in the pair of protruding electrodes 18b and 20b. Preferably, the floating electrode 24 is It is positioned along the edge at regular intervals from the protruding electrodes 18b and 20b. At this time, the gap between the floating electrode 24 and the protruding electrodes 18b and 20b serves as another discharge gap during sustain discharge. The floating electrode 24 is not connected to the outside and is independently positioned at the center of each discharge cell 8R, 8G, and 8B, and has a potential between the scan electrode 18 and the common electrode 20 during sustain discharge. .

As the bus electrodes 18a and 20a, a mixture of chromium (Cr) and copper (Cu) or silver (Ag) is preferable, and the protruding electrodes 18b and 20b and the floating electrode 24 have a high light transmittance. indium tin oxide) is preferred.

The first substrate 2 and the second substrate 4 having the above-described configuration are edge-bonded by a sealant (not shown) such as a frit, and discharge gas (mainly Ne-Xe mixed gas) after the inside is exhausted. Is sealed in a filled state to form a PDP.

By the above-described configuration, when the address voltage Va is applied between the address electrode 12 and the scan electrode 18 of the red discharge cell 8R as an example, the address discharge occurs in the discharge cell 8R, and the address discharge occurs. As a result, wall charges are accumulated on the second dielectric layer 26 covering the sustain electrode 22 to select this discharge cell 8R.

Subsequently, when the sustain voltage Vs is applied between the scan electrode 18 and the common electrode 20 of the selected discharge cell 8R, from the discharge gap G1 between the scan electrode 18 and the common electrode 20. Plasma discharge, that is, sustain discharge occurs, and vacuum ultraviolet rays are emitted from the excitation atoms of Xe produced during the sustain discharge. The vacuum ultraviolet rays excite the fluorescent layer 16R of the discharge cell 8R to emit visible light, thereby providing a predetermined display.

In this process, the plasma discharge generated by the sustain voltage Vs diffuses in an approximately arc shape toward the outer portion of the discharge cell 8R, and then disappears. In this embodiment, each discharge cell 8R, 8G, 8B is extinguished. ) Is shaped in accordance with the diffusion form of the plasma discharge, so that efficient sustain discharge occurs in all areas of the discharge cells 8R, 8G, and 8B, resulting in high discharge efficiency. Furthermore, the discharge cells 8R, 8G, and 8B have a contact area of the fluorescent layers 16R, 16G, and 16B with respect to the discharge region as the cross-sectional shapes shown in Fig. 3 toward the outer portion of the discharge cells 8R, 8G, and 8B. It expands and light emission efficiency becomes high.

In addition, as shown in FIG. 4, when applying the sustain voltage Vs between the scan electrode 18 and the common electrode 20, the discharge gap G1 between the scan electrode 18 and the common electrode 20. The sustain discharge is started first from, and a potential lower than the scan electrode 18 and higher than the common electrode 20 is applied to the floating electrode 24. As a result, after the sustain discharge is started from the discharge gap G1, the sustain discharge occurs from the discharge gap G2 between the two electrodes due to the potential difference between the floating electrode 24 and the scan electrode 18, and the floating electrode 24. The sustain discharge occurs from the discharge gap G3 between the two electrodes due to the potential difference between the common electrode 20 and the common electrode 20.

As a result, after the sustain discharge is started from the discharge gap G1 corresponding to the outer portion of the discharge cell 8R, the discharge between the floating electrode 24 and the scan electrode 18 corresponding to the center of the discharge cell 8R is started. A sustain discharge is generated from the gap G2 and the discharge gap G3 between the floating electrode 24 and the common electrode 20 to emit strong vacuum ultraviolet rays over the entire area of the discharge cell 8R.

As described above, in the present embodiment, both the outer and center portions of the discharge cells 8R, 8G, and 8B function as main discharge regions that emit strong vacuum ultraviolet rays by the shape of the sustain electrode 22 and the floating electrode 24 described above. The advantages of higher discharge intensity and PDP efficiency are expected.

5 is a partial plan view of a PDP according to a second embodiment of the present invention, and describes a deformed structure of the floating electrode.

Referring to the drawings, the present embodiment is based on the structure of the first embodiment described above, and the floating electrode 32 is divided into first and second floating electrodes 32a and 32b. Preferably, the first and second floating electrodes 32a and 32b are disposed to face each other with an arbitrary discharge gap G4 interposed at the center of the discharge cell 8R.

Therefore, in the present embodiment, when the sustain voltage Vs is applied between the scan electrode 18 and the common electrode 20 after the address discharge, the sustain voltage Vs is maintained from the discharge gap G1 between the scan electrode 18 and the common electrode 20. The discharge is started. In this process, a potential lower than that of the scan electrode 18 is applied to the first floating electrode 32a, and a potential higher than that of the common electrode 20 is applied to the second floating electrode 32b, so that the first and second floating electrodes 32a are applied. , 32b) a constant potential difference exists.

As a result, after the sustain discharge is started from the discharge gap G1 between the scan electrode 18 and the common electrode 20, the discharge gap G2 between the first floating electrode 32a and the scan electrode 18, and the second floating. A sustain discharge occurs from the discharge gap G3 between the electrode 32b and the common electrode 20 and from the discharge gap G4 between the first floating electrode 32a and the second floating electrode 32b to discharge cell 8R. Emit a strong vacuum ultraviolet light over the entire area.

As described above, in the present embodiment, the main discharge region is effectively extended by using the discharge gap G4 between the first and second floating electrodes 32a and 32b corresponding to the center of the discharge cells 8R, 8G, 8B for sustain discharge. This is expected to increase the discharge intensity and the PDP efficiency.

Meanwhile, in the above, the case in which the floating electrode is divided into the first and second floating electrodes has been described. However, the number of the floating electrodes is not limited to two, but may be divided into more than two.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Of course it belongs to the range of.

As described above, according to the present exemplary embodiment, the main discharge region is enlarged by the floating electrode positioned between the scan electrode and the common electrode, so that strong sustain discharge occurs at both the center and the outer portion of the discharge cell. Therefore, the plasma display panel according to the present embodiment emits stronger vacuum ultraviolet rays during sustain discharge, thereby increasing discharge intensity, thereby increasing the luminance ratio to power consumption, that is, the PDP efficiency.

Claims (10)

First and second substrates opposed to each other at arbitrary intervals; Address electrodes formed on an opposite surface of the first substrate to a second substrate; A partition wall disposed in a space between the first substrate and the second substrate to partition discharge cells and a non-discharge region; A fluorescent layer located in each of the discharge cells; Sustain electrodes formed on an opposite surface of the second substrate to a first substrate; And A floating electrode disposed at a predetermined distance from the sustain electrode; The non-discharge area is disposed in an area surrounded by a horizontal axis and a vertical axis passing through the center of each discharge cell, The sustain electrode includes a scan electrode and a common electrode having a concave portion at the center of opposite surfaces facing each other, And the floating electrode is independently positioned within each discharge cell at random intervals between the scan electrode and the common electrode between the recesses. The method of claim 1, And wherein the discharge cells are formed narrower as the widths of both ends located in the direction of the address electrodes move away from the center of the discharge cells. The method of claim 1, And the discharge cell is formed to be smaller as the depth measured from an upper end of the barrier rib at both ends positioned along the address electrode direction is farther from the center of the discharge cell. The method of claim 1, And the partition wall includes a first partition member parallel to the address electrode, and a second partition member formed to intersect the first partition member at a predetermined inclination angle. The method of claim 1, And a bus electrode in which the scan electrode and the common electrode are formed so as to correspond to a pair of outer portions of each of the discharge cells, and protruding electrodes extending from the bus electrode toward the center of each of the discharge cells. The method of claim 5, And the protruding electrode has a shape in which a rear end portion of the protruding electrode is gradually narrowed in width toward the bus electrode. The method according to claim 1 or 5, And a concave portion formed at a center of opposing surfaces where the protruding electrodes face each other, and the floating electrode is positioned at the center of the concave portion at an arbitrary distance from the protruding electrode. delete The method of claim 1, And at least two floating electrodes. The method of claim 1, And the floating electrode is a transparent electrode.

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