KR100739038B1 - Plasma display panel - Google Patents

Abstract

The present invention relates to a plasma display panel capable of reducing the discharge start voltage (Vf) and reducing the time delay for discharging by improving the display electrode structure of the opposite discharge type plasma display panel. First and second substrates having a plurality of discharge cells partitioned in a space therebetween, address electrodes extending in a first direction on the first substrate, spaced apart from the address electrodes, and crossing the first direction. Display electrodes extending in a second direction and extending from the first substrate toward the second substrate to face each other with a space therebetween, and a phosphor layer formed in each discharge cell; The display electrodes include protrusions protruding toward the centers of the respective discharge cells.

Plasma Display Panel, PDP, Display Electrode, Projection

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

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

2 is a cross-sectional view taken along the line II-II of FIG. 1.

3 is a partial perspective view illustrating the shape of a display electrode of the plasma display panel according to the first embodiment of the present invention.

FIG. 4 is a view schematically illustrating a layout structure of a display electrode and an address electrode of the plasma display panel according to the first embodiment of the present invention.

5 is a partial perspective view illustrating the shape of a display electrode of the plasma display panel according to the second embodiment of the present invention.

FIG. 6 is a schematic diagram illustrating an arrangement structure of a display electrode and an address electrode of a plasma display panel according to a second embodiment of the present invention.

FIG. 7 is a view schematically illustrating an arrangement structure of a display electrode and an address electrode of a plasma display panel according to a third exemplary embodiment of the present invention.

FIG. 8 is a view schematically illustrating a layout structure of a display electrode and an address electrode of a plasma display panel according to a fourth embodiment of the present invention.

The present invention relates to a plasma display panel having an improved display electrode structure.

In general, a plasma display panel (PDP) is a product (R) that is generated when a vacuum ultraviolet ray (VUV) emitted from a plasma obtained through gas discharge excites a phosphor, An image is realized using visible light of green (G) and blue (B).

Such a plasma display panel can realize a super-large screen of 60 inches or more in a thickness of only 10 cm, and is a self-luminous display device such as a cathode ray tube (CRT), and has no characteristic of distortion due to color reproducibility and viewing angle.

In addition, the plasma display panel has a spotlight as a television (TV) and an industrial flat panel display having a simple manufacturing method compared to a liquid crystal display (LCD) and the like in terms of productivity and cost.

The structure of the plasma display panel has been developed for a long time since the 1970s, and the structure generally known is a three-electrode surface discharge type structure. The three-electrode surface discharge type structure consists of one substrate including two electrodes on the same surface and another substrate including address electrodes vertically spaced apart from each other at a predetermined distance therebetween, with a discharge gas enclosed therebetween. Structure. In general, the presence or absence of the discharge is determined by the discharge of the address electrode facing the scan electrode independently connected to each line, and the sustain discharge indicating the luminance is performed by two electrode groups located on the same plane. .

Plasma display panels recently introduced on the market show resolutions of XGA (1024 x 768) at 42 inches, and ultimately, display devices capable of expressing Full-HD (High Definition) images are required. . In order to be able to express Full-HD (1920 x 1080) images in the plasma display panel, it is necessary to reduce the size of the discharge cells, that is, achieve a higher density.

In the conventional plasma display panel having a three-electrode surface discharge structure, the reduction of the discharge cell size means the reduction of the electrode length and area. This may result in a problem of an increase in discharge start voltage along with a decrease in brightness and efficiency of the plasma display panel. Therefore, as the plasma display panel becomes more fixed, a structure different from the structure in which the address is caused to face discharge and the sustain discharge is caused by surface discharge is required.

An object of the present invention is to provide a plasma display panel which can reduce the discharge start voltage (Vf) and reduce the time delay for discharging by improving the display electrode structure of the counter discharge type plasma display panel.

In order to achieve the above object, the present invention is disposed to face each other at a predetermined interval, the first substrate and the second substrate having a plurality of discharge cells divided in the space therebetween, the first direction on the first substrate Address electrodes which are formed to extend in the second direction, and are formed to extend in a second direction spaced apart from the address electrodes and intersect with the first direction, and extend from the first substrate toward the second substrate, with a space therebetween. Display electrodes are formed to face each other, and a phosphor layer formed in each discharge cell, and the display electrodes preferably include protrusions protruding toward the center of each discharge cell.

The apparatus may further include a partition wall that partitions a plurality of discharge cells in a space between the first substrate and the second substrate.

In addition, the display electrodes are formed on different layers from the address electrodes, and the display electrodes may be disposed to cross the boundary of discharge cells adjacent to each other in the first direction.

The protrusion may be integrally formed with the display electrodes, and may protrude toward the center of each discharge cell from opposite surfaces of the display electrodes facing each discharge cell.

It is preferable that the protrusion part has a tip toward the center of the discharge cell, and the tip is disposed on the center line in the width direction of the discharge cell.

A plurality of protrusions may be formed in a portion corresponding to each discharge cell of the display electrode. In this case, a plurality of protrusions corresponding to each discharge cell may be adjacently disposed adjacent to each other and the center of the length of the plurality of protrusions may be formed. It is preferable to arrange | position on the width direction center line.

Further, it is preferable that the protrusions are formed at corresponding positions included in the respective discharge cell regions.

On the other hand, the address electrode includes a bus electrode formed at one edge of the corresponding discharge cell in each discharge cell region, and a protruding electrode protruding from the bus electrode toward the corresponding discharge cell. It is preferable to form it biasing toward either electrode among each electrode which comprises.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. While many specific details are set forth in order to provide a more general understanding of the invention, such as the following description and the annexed drawings, these specific details are illustrated for the purpose of illustrating the invention and are meant to limit the invention to those details. It is not. And a detailed description of known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

FIG. 1 is a perspective view showing the configuration of a plasma display panel according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line II-II of FIG.

A configuration of a plasma display panel according to a first embodiment of the present invention will be described with reference to the above drawings.

First, in the plasma display panel according to the first embodiment of the present invention, a first substrate 10 (hereinafter referred to as a “front substrate”) and a second substrate 20 (hereinafter referred to as a “back substrate”) are basically set. The display electrodes 25 and the address electrodes 32 are disposed on the front substrate 10 at intervals, and the rear substrate 20 is disposed between the front substrate 10 and the rear substrate 20 in the space between the front substrate 10 and the rear substrate 20. A plurality of discharge cells 18 are formed by the partition wall 16 so as to cause plasma discharge.

The partition wall 16 forming the discharge cells 18 includes a first partition member 16a formed side by side in the direction in which the address electrode 32 extends (y-axis direction, first direction in the drawing), and the address electrode 32. It includes a second partition member (16b) is formed in a direction (x-axis direction, second direction of the drawing) perpendicular to the direction in which the cross) extends. The first partition member 16a and the second partition member 16b may be connected to each other to be integrally formed.

In the discharge cell 18, a phosphor layer 19, which absorbs ultraviolet rays and emits visible light, is formed along the partition walls 16 and the bottom surface, and discharge gas (eg, xenon ( Xe), a mixed gas containing neon (Ne) and the like) is filled. The phosphor layers 19 formed inside the discharge cells 18 are phosphor layers 19 (19; 19R, 19G, 19B) formed by applying phosphors of red (R), green (G), and blue (B), respectively. .

The display electrode 25 formed on the front substrate 10 performs a function of selecting a discharge cell to emit light by interacting with the address electrode 32 and causing a sustain discharge to display the selected discharge cell. The display electrode 25 includes a first electrode 21 (hereinafter referred to as a 'holding electrode') and a second electrode 23 (hereinafter referred to as a 'scan electrode') corresponding to each discharge cell 18. The sustain electrode 21 and the scan electrode 23 constituting the display electrode 25 are elongated so as to extend along the direction crossing the address electrode 32 at right angles (the x-axis direction in the drawing), respectively. 32, the same electrodes are alternately arranged alternately so as not to be adjacent to each other along the direction in which 32) is formed. That is, the display electrode 25 is formed on a different layer from the address electrode 32, and is shared with the neighboring discharge cells 18 corresponding to the partition wall 16 formed in the direction crossing the address electrode 32. To form. On the other hand, the sustain electrode 21 and the scan electrode 23 constituting the display electrodes 25 of the plasma display panel according to the first embodiment of the present invention are sustain electrodes 21 constituting the display electrode 25 from the surface thereof. ) And protrusions 21a and 23a which protrude in the center direction of the respective discharge cells 18 corresponding to the scan electrodes 23 and face each other.

The sustain electrode 21 mainly supplies a voltage necessary for discharging the sustain section, and the scan electrode 23 supplies a voltage required for the reset section, the address section, and the sustain section, respectively. That is, the sustain electrode 21 is mainly involved in the discharge of the sustain period, and the scan electrode 23 is all involved in the discharge of the reset period, the address period and the sustain period. For reference, the functions of the sustain electrode 21 and the scan electrode 23 may vary depending on the discharge voltage supplied to each electrode, so that the sustain electrode 21 and the scan electrode 23 may be distinguished from each other. It is not preferable to limit to this.

In the configuration of the display electrode 25 described above, when the scan electrode 23 and the address electrode 32 act to select a discharge cell, an address pulse is supplied to the address electrode 32 and a scan pulse is applied to the scan electrode 23. When is supplied, two neighboring discharge cells 18 select. In addition, when a scan pulse is supplied to the scan electrode 23, two discharge cells 18 rows shared by the scan electrode 23 are scanned. In this case, the discharge cell row refers to a group consisting of discharge cells continuously arranged in parallel with the display electrode. Therefore, in the plasma display panel as in the embodiment of the present invention, the sustain electrodes 21 and the scan electrodes 23 are divided into even rows and odd rows, respectively. ) And a sustain pulse to the scan electrode 23, and a sustain pulse can be supplied to the sustain electrode 21 and the scan electrode 23 in the odd row during the sustain discharge of the odd row to display the final image.

On the other hand, the sustain electrode 21 and the scan electrode 23 protrude toward the rear substrate 20 in a direction away from the front substrate 10 (negative z-axis direction in FIGS. 1 and 2), and the space therebetween. Are formed to face each other. The space formed as described above may induce an opposite discharge between the sustain electrode 21 and the scan electrode 23 facing each other. That is, the sustain electrode 21 and the scan electrode 23 are preferably formed to face toward the center of each discharge cell 18, it is preferably made of a metal electrode to ensure the electrical conductivity.

In addition, each of the sustain electrodes 21 and the scan electrodes 23 is formed to have a longer protruding length than the width. That is, when the sustain electrode 21 and the scan electrode 23 are respectively cut in a plane perpendicular to the longitudinal direction, the direction parallel to the front substrate 10 and the back substrate 20 plane (see FIG. The length (protrusion length) in the direction (z-axis direction in the drawing) perpendicular to the front substrate 10 and back substrate 20 planes is formed longer than the length in the y-axis direction (width length).

In this configuration, when the size of the discharge cell 18 needs to be reduced in the planar direction to realize the high-definition display, the height of the sustain electrode 21 and the scan electrode 23 can be compensated for this.

The display electrode 25 is covered with a second dielectric layer 28b and is electrically separated from the address electrode 32 with the first dielectric layer 28a and the second dielectric layer 28b therebetween. The first dielectric layer 28a and the second dielectric layer 28b may be made of the same material.

Meanwhile, the MgO protective layer 29 may be formed to protect the first dielectric layer 28a and the second dielectric layer 28b to protect the dielectric layer 28 from collision of ions of the ionized atoms during plasma discharge. Since the MgO protective layer 29 has a high emission coefficient of secondary electrons when ions collide with each other, the discharge efficiency can be improved.

A plurality of address electrodes 32 are formed along the first direction (y-axis direction in the drawing) of the front substrate 10 on the opposite surface of the front substrate 10 from the rear substrate 20. The address electrode 32 is covered with a first dielectric layer 28a formed on the entire inner surface of the front substrate 10. The address electrode 32 is composed of a combination of the bus electrode 32a and the protruding electrode 32b, as in the embodiment of the present invention. The address electrode 32 is formed in a stripe shape so as to be parallel to each other while maintaining a predetermined distance from the neighboring address electrodes. It may be.

The bus electrode 32a is formed to extend in the first direction (y direction) as shown in FIG. 1 to be disposed at one edge of the discharge cell 18. In this case, it is preferable that the bus electrode 32a is disposed directly above the first partition member 16a to reduce the interference portion with the discharge cell 18 so that the opening ratio of the discharge cell 18 can be further improved. .

The protruding electrode 32b is formed in a rectangular shape to protrude from the bus electrode 32a toward the inside of the discharge cell 18. In this case, the protruding electrode 32b may be formed of a transparent electrode (eg, indium tin oxide (ITO) electrode) to secure the aperture ratio of the plasma display panel. In this case, the bus electrode 32a is preferably made of a metal electrode in order to compensate for the high resistance of the transparent electrode to improve electrical conductivity.

The protruding electrode 32b is disposed between one of the two electrodes constituting the display electrode 25 between the sustain electrode 21 and the scan electrode 23 constituting the display electrode 25. The electrodes may be arranged to be shared by the discharge cells adjacent to one of the two electrodes constituting the display electrode 25. Herein, any one of the display electrodes 25 refers to the scan electrodes 23 among the sustain electrodes 21 and the scan electrodes 23. With this configuration, the address discharge voltage can be lowered by arranging the scan electrodes 23 among the address electrodes 32 and the display electrodes 25 involved in the address discharge.

3 is a partial perspective view illustrating shapes of a sustain electrode and a scan electrode constituting the display electrode of the plasma display panel according to the first embodiment of the present invention, and FIG. 4 is a plasma display panel according to the first embodiment of the present invention. The structure of the sustain electrode, the protruding electrode arrangement of the scan electrode and the address electrode constituting the display electrode of FIG. In FIG. 4, the display electrode 25 and the second dielectric layer 28b covering the display electrode 25 are illustrated together, and the second dielectric layer 28b and the third dielectric layer 28c forming the discharge cells are illustrated. The address electrode 32 shown on the display electrode 25 is illustrated by omitting the first dielectric layer 28a.

3 and 4, the configuration of the protrusions 21a and 23a formed on the display electrode 25 of the plasma display panel according to the first embodiment of the present invention will be described.

As shown in FIGS. 3 and 4, the protrusions 21a and 23a constitute the sustain electrode 21 constituting the display electrode 25 and the sustain electrode constituting the display electrode 25 from both surfaces of the scan electrode 23. Protruding toward the center of each of the discharge cells 18 adjacent to the 21 and the scanning electrode 23 is formed to face. The protrusions 21a and 23a may be integrally formed with the display electrodes 25, and a cross-sectional shape perpendicular to the longitudinal direction of the protrusions 21a and 23a may be formed in a triangular shape as shown in FIG. 3.

As described above, when the protrusions of the protrusions 21a and 23a are formed in a triangular shape, the edges of the protrusions 21a and 23a are protruded so as to be positioned on the center lines of the corresponding discharge cells 18 so that the discharge cells 18 are in the center direction It is preferable to form a protrusion.

3 and 4, at least one protrusion 21a protruding from the sustain electrode 21 and the scan electrodes 23 constituting the display electrode 25 toward the center of each corresponding discharge cell 18 is provided. , 23a). The size and number of the protrusions 21a and 23a can be appropriately changed according to the size of the discharge cell 18 according to the resolution.

The protrusions 21a and 23a configured as described above can maintain the shortest distance d1 between the protrusions 21a formed on the sustain electrode 21 and the protrusions 23a formed on the scan electrode 23. A strong electric field can be used by concentrating the electric field lines at the start of. In addition, the ignition effect is given to the discharge cells 18, so that the discharge start voltage can be reduced, and at the same time, the discharge delay phenomenon can be improved.

Meanwhile, as shown in FIGS. 5 and 6, the sustain electrodes 31 and the scan electrodes 33 constituting the display electrodes are provided with a plurality of protrusions 31a protruding toward the center of the corresponding discharge cells 18. 33a).

FIG. 5 is a partial perspective view illustrating the shape of the sustain electrode and the scan electrode constituting the display electrode of the plasma display panel according to the second embodiment of the present invention, and FIG. 6 is a plasma display panel according to the second embodiment of the present invention. The structure of the sustain electrode, the protruding electrode arrangement of the scan electrode and the address electrode constituting the display electrode of FIG.

As shown in FIG. 5 and FIG. 6, when a plurality of protrusions 31a and 33a are formed, each of the protrusions 31a and 33a may be continuously connected to each other such that the center of the entire length of the plurality of protrusions 31a and 33a is positioned on the discharge cell center line. It is preferable to form.

On the other hand, since the discharge does not substantially occur in the portion intersecting the address electrode 32 (for example, the portion other than the discharge region in the corresponding positional relationship between the display electrode and the discharge cell 18), the protrusions 21a, 31a, 23a. , 33a is preferably formed at a corresponding position included in each discharge cell 18 region.

The protruding portions 31a and 33a configured as described above can maintain the shortest distance d2 between the protruding portion 31a formed on the sustain electrode 31 and the protruding portion 33a formed on the scanning electrode 33, thereby providing a distance oil dielectric. A strong electric field can be used by concentrating the electric field lines at the start of. In addition, the ignition effect is given to the discharge cells 18, so that the discharge start voltage can be reduced, and at the same time, the discharge delay phenomenon can be improved.

7 and 8 schematically illustrate arrangement structures of display electrodes and address electrodes of the plasma display panel according to the third and fourth embodiments of the present invention.

In the third and fourth embodiments of the present invention, the sustain electrodes 21 and 31 and the scan electrode 23 constituting the display electrodes of the plasma display panel in the first and second embodiments of the present invention described above. 33 and the structure of the arrangement of the protruding electrodes 42b of the address electrodes 42 are formed differently. Referring to FIGS. 7 and 8, the protruding electrode 42b is disposed to protrude from each discharge cell between each of the sustain electrodes 21 and 31 and the scan electrodes 23 and 33 constituting the display electrode. Each of the sustain electrodes 21 and 31 and the scan electrodes 23 and 33 constituting the display electrode may have at least one protrusion 21a, 31a, and 23a protruding toward the center of the corresponding discharge cell 18. , 33a) is formed.

Meanwhile, in the third and fourth embodiments of the present invention, as in the first and second embodiments of the present invention described above, the scan electrode 23 among the address electrodes 42 and the display electrodes involved in the address discharge is performed. , 33) can be arranged to lower the address discharge voltage.

On the other hand, the detailed description of the present invention has been described with reference to specific embodiments, of course, various modifications are possible without departing from the scope of the invention.

In the first to fourth embodiments of the present invention described above, the shape of the protrusions 21a, 31a, 23a, and 33a has been described as having a triangular shape. However, those skilled in the art will appreciate the protrusions 21a. , 31a, 23a, and 33a may be modified to improve discharge efficiency.

For example, the shape of the protrusion may be formed in a cone shape.

In this case, the conical protrusion is preferably a structure in which the tip portion protrudes toward the center of the discharge cell as in the detailed description of the present invention, and is configured such that the center of the cone protruding in the center of the discharge cell coincides with the center line of the discharge cell. More preferred.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the claims below but also by the equivalents of the claims.

As described above, in the plasma display panel according to the present invention, the electrodes are disposed on the front substrate by disposing the address electrodes on the front substrate so that all the electrodes involved in the discharge in the discharge cells are located on the front substrate. It is possible to secure a larger discharge space. This may increase the luminous efficiency as the area of the portion to which the phosphor is applied increases. In addition, as the charge is accumulated on the phosphor, it is possible to prevent the phosphor lifetime from being reduced by ion sputtering.

In addition, since long gap discharge, which is known to be excellent in luminous efficiency, is possible by inducing a counter discharge between the sustain electrode and the scan electrode, a higher luminous efficiency can be obtained than in the conventional surface discharge structure.

In addition, as the plasma display panel becomes more fine and the size of the discharge cell becomes smaller, problems caused by the conventional surface discharge structure, that is, reduction of luminous efficiency and luminance and increase in voltage during room deployment can be overcome.

In addition, by improving the shape of the display electrode in the electrode structure of the opposite discharge type plasma display panel, the discharge start voltage Vf is reduced and the discharge delay time is reduced by reducing the discharge ignition time through the discharge ignition function. It can be effective.

Claims (13)

A first substrate and a second substrate disposed to face each other at predetermined intervals, the discharge cells being divided into a plurality of spaces therebetween; Address electrodes extending in a first direction on the first substrate; Formed in a second direction spaced apart from the address electrodes and extending in a second direction crossing the first direction, and alternately disposed to cross a boundary of adjacent discharge cells along the first direction, and alternately disposed from the first substrate; Display electrodes extending toward the substrate and formed to face each other with a space therebetween; And A phosphor layer formed in each of the discharge cells, The display electrodes may include a protrusion having a tip protruding toward the center of each discharge cell along the first direction. The method of claim 1, And a partition wall partitioning the plurality of discharge cells in a space between the first substrate and the second substrate. The method of claim 1, And the display electrodes are formed on different layers from the address electrodes. The method of claim 1, And the protrusion is integrally formed with the display electrodes. The method of claim 3, And the protrusion protrudes toward the center of each discharge cell from an opposite surface of the display electrodes facing each discharge cell. delete The method of claim 1, The tip of the protrusion is disposed on the center line in the width direction of the discharge cell. The method of claim 7, wherein And a plurality of protrusions formed at portions corresponding to each of the discharge cells of the display electrode. The method of claim 8, And a plurality of protrusions corresponding to each of the discharge cells are disposed adjacent to each other in succession. The method of claim 9, And a center of a length in which a plurality of protrusions are formed is disposed on a center line in a width direction of the discharge cell. The method of claim 4, wherein And the protrusion is formed at a corresponding position included in each discharge cell area. The method of claim 1, The address electrode may include a bus electrode formed at one edge of a discharge cell corresponding to each discharge cell region; And a protrusion electrode protruding from the bus electrode toward a corresponding discharge cell. The method of claim 12, And the protruding electrode is formed to be biased toward one of the electrodes constituting the display electrode.

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