KR100730116B1 - Plasma Display Panel - Google Patents

Abstract

SUMMARY OF THE INVENTION An object of the present invention is to provide a plasma display panel which can increase luminance and efficiency by increasing an area to be coated on a phosphor layer.

In order to achieve the above object, the present invention provides a rear substrate, address electrodes disposed on an upper side of the rear substrate and extending in one direction, a lower dielectric layer covering the address electrodes, a partition wall formed on an upper side of the lower dielectric layer, and the rear substrate. A front substrate disposed in parallel with the front substrate, sustain electrode pairs disposed below the front substrate and extending to cross the address electrodes, an upper dielectric layer covering the sustain electrode pairs, and a protective layer covering the upper dielectric layer; And a discharge gas in the discharge cell, wherein a phosphor layer is coated on the upper surface of the lower dielectric layer partitioned by the partition wall and the discharge space surrounded by the partition wall, and the upper dielectric layer is etched between the sustain electrode pairs of the discharge cell section. The gap is formed, and the phosphor layer is also applied to the gap on the lower surface of the front substrate.

Description

Plasma Display Panel {Plasma Display Panel}

1 is an exploded perspective view of a plasma display panel having a top plate of a conventional ridge structure.

FIG. 2 is an exploded cross-sectional view of the plasma display panel of FIG. 1.

3 is an exploded perspective view of a plasma display panel having a top plate of a ridge structure according to a preferred embodiment of the present invention.

4 is an exploded cross-sectional view of the plasma display panel of FIG. 3.

FIG. 5 is a transmission view of the upper plate viewed from a cross section taken along the line II ′ of FIG. 4.

6 is an exploded perspective view of a plasma display panel having a top plate of a ridge structure according to another embodiment of the present invention.

FIG. 7 is a transmission of the upper plate viewed from a cross section taken along the line II-II ′ of FIG. 6.

Explanation of symbols on the main parts of the drawings

110: back substrate 111: address electrode

112: lower dielectric layer 113: partition wall

115, 116: phosphor layer 120: front substrate

121a and 121b sustain electrodes 122a and 122b bus electrodes

123: upper dielectric layer 124: protective layer

130: gap

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel having a ridge structure, and more particularly, to a plasma display panel in which a phosphor is formed on a top plate of the ridge structure to improve a permanent afterimage.

Plasma display panels (PDPs), which form images using electrical discharges, have excellent display performance, such as brightness and viewing angle, and their use is increasing day by day. In the plasma display panel, a discharge occurs in a gas between the electrodes by a direct current or an alternating voltage applied to the electrode, and phosphors are excited by the radiation of ultraviolet rays accompanying the gas discharge process to emit visible light.

1 and 2 illustrate an example of a conventional plasma display panel having a ridge structure. In FIG. 2, only the front substrate is rotated by 90 ° to more clearly show the internal structure of the plasma display panel.

1 and 2 together, the conventional ridge structure plasma display panel includes a rear substrate 10 and a front substrate 20 facing each other.

A plurality of address electrodes 11 are arranged in a stripe shape on the top surface of the back substrate 10, and the address electrodes 11 are filled by a white lower dielectric layer 12. In addition, a plurality of partitions 13 are formed on the upper surface of the lower dielectric layer 12 at predetermined intervals to prevent electrical and optical interference between the discharge cells. On the inner surface of the discharge cells partitioned by the partitions 13, phosphor layers 15 of red (R), green (G), and blue (B) are respectively coated with a predetermined thickness, and Ne, Xe or a discharge gas mixed with these is injected.

The front substrate 20 is a transparent substrate through which visible light can be transmitted and is mainly made of glass, and is coupled to the rear substrate 10 provided with the partition wall 13. On the bottom surface of the front substrate 20, stripe-shaped sustaining electrodes 21a and 21b orthogonal to the address electrodes 11 are formed in pairs. The sustain electrodes 21a and 21b are mainly made of a transparent conductive material such as indium tin oxide (ITO) to transmit visible light. In order to reduce the line resistance of the sustain electrodes 21a and 21b, bus electrodes 22a and 22b made of metal are formed on the bottom of each of the sustain electrodes 21a and 21b. The width is made narrower. The sustain electrodes 21a and 21b and the bus electrodes 22a and 22b are embedded by a transparent upper dielectric layer 23, and a protective layer 24 is formed on the bottom of the upper dielectric layer 23.

In this structure, in order to improve the low voltage and the efficiency, a dielectric is formed in the ridge type structure in the upper plate structure composed of the sustain electrodes, the upper dielectric layer, and the protective layer around the front substrate. That is, a part of the upper dielectric layer in the space between the pair of sustain electrodes 21a and 21b is etched away in the discharge cell, thereby forming a gap 30 between the sustain electrodes in one discharge cell. The lower surface of the substrate is exposed.

However, in the conventional plasma display panel having a ridge structure, since the phosphor layer is formed only inside the discharge cell surrounded by the partition wall, that is, the lower plate centered on the back substrate, the area to which the phosphor layer is applied is low, so that the luminance is low and the efficiency is low. There was this.

The present invention solves the above problems, and in the ridge type plasma display panel, the phosphor layer is formed not only in the discharge space of the lower plate partitioned by the partition wall but also in the gap where the upper dielectric layer of the front substrate is etched, thereby reducing the area where the phosphor layer is applied. It is an object of the present invention to provide a plasma display panel which can be increased to achieve brightness and efficiency improvement.

In order to achieve the above object, the plasma display panel according to an embodiment of the present invention,

Back substrate;

Address electrodes disposed on the rear substrate and extending in one direction;

A lower dielectric layer covering the address electrodes;

Barrier ribs formed on the lower dielectric layer;

A front substrate disposed in parallel with the rear substrate;

Sustain electrode pairs disposed below the front substrate and extending to cross the address electrodes;

An upper dielectric layer covering the sustain electrode pairs;

A protective layer covering the upper dielectric layer; And

A discharge gas in the discharge cell;

A phosphor layer is coated on the upper surface of the lower dielectric layer partitioned by the partition wall and the discharge space surrounded by the partition wall, and a gap in which the upper dielectric layer is etched is formed between the sustain electrode pairs of the discharge cell section to form the gap on the lower surface of the front substrate. Also characterized in that the phosphor layer is applied.

Here, the phosphor layer is coated on the surface of the upper dielectric layer is etched to expose the lower surface of the front substrate.

Furthermore, the surface of which the lower surface of the front substrate is exposed is preferably formed as a groove for applying the phosphor.

The groove is located inside a section of the discharge cell.

In addition, the phosphor layer is applied inside the groove.

Next, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 is an exploded perspective view of a plasma display panel according to a first exemplary embodiment of the present invention, and FIG. 4 is an exploded cross-sectional view of the plasma display panel of FIG. 3. In FIG. 4, only the front substrate is rotated by 90 ° to more clearly show the internal structure of the plasma display panel.

Referring to FIGS. 3 and 4, the plasma display panel according to the first embodiment of the present invention includes a rear substrate 110, a plurality of address electrodes 111 formed on an upper surface of the rear substrate 110, and a plurality of address electrodes 111. And a lower dielectric layer 112 formed to bury the address electrode 111 on an upper surface of the rear substrate 110. In addition, a partition wall 113 is formed on the lower dielectric layer 112 to prevent electrical and optical interference between the discharge cells by dividing the discharge cells. In addition, the phosphor layer 116 is coated on the upper surface of the lower dielectric layer 112 partitioned by the partition wall 113 and the discharge space surrounded by the partition wall 113.

The front substrate 120 coupled to the rear substrate 110 to form a discharge space above the partition 113 and formed on the lower surface of the front substrate 120 and predetermined to intersect the address electrode 111. At an angle, the sustain electrodes 121a and 121b having a stripe shape are formed in pairs. Therefore, two sustain electrodes are disposed in pair to extend through the discharge cells.

The sustain electrodes 121a and 121b are mainly made of a transparent conductive material such as indium tin oxide (ITO) to transmit visible light. However, such a material such as ITO has a large electrical resistance, so in order to reduce the line resistance of the sustain electrodes 121a and 121b, the bus electrodes 122a made of a metal material on the bottom of each of the sustain electrodes 121a and 121b. , 122b is formed to have a smaller width than the sustain electrodes 121a and 121b. The sustain electrodes 121a and 121b and the bus electrodes 122a and 122b are buried by the transparent upper dielectric layer 123. Thus, the sustain electrodes 121a and 121b and the bus electrodes 122a and 122b are not directly exposed to the discharge space.

On the other hand, a portion of the upper dielectric layer 123 is etched away so that the upper plate centering on the front substrate 120 has a ridge structure. The etched form does not necessarily have to vertically etch the upper dielectric layer, but it is sufficient to form a ridge shape as the unetched surface of the upper dielectric layer protrudes relatively to the etched portion. Specifically, a portion of the upper dielectric layer filled between the pair of sustain electrodes 121a and 121b is etched and removed, so that the gap 130 is exposed to the lower surface of the front substrate 120 at the portion where the dielectric layer is removed. ) Is formed.

Since the gap 130 is formed, red, blue, and green phosphor layers 115 are applied to portions of the lower surface of the front substrate 120 from which the upper dielectric layer 123 is removed. In particular, the lower surface of the front substrate 120 exposed to the gap 130 as a separate section in which the phosphor layer 115 is applied is formed as a concave groove 132, but preferably has a square groove shape.

The groove 132 preferably has a length smaller than the horizontal and vertical lengths of the discharge cells so that the grooves are positioned within the sections of the discharge cells without crossing the sections of the discharge cells. In addition, since the phosphor layer 115 is coated inside the groove 132, the groove should be formed to a depth enough to apply the phosphor layer to a predetermined thickness. In addition, when the phosphor layer is applied to both the bottom surface and the side of the inside of the groove, it is preferable that the size of the groove is set so that the phosphor layer applied to the side of the inside of the groove can also form a predetermined height. Further, it is preferable that the phosphor layer 115 is integrally formed not only on the inner bottom surface of the groove 132 but also on the inner side surface of the groove.

Meanwhile, the upper dielectric layer 123 is covered by the protective layer 124. In the gap 130 in which the upper dielectric layer 123 is etched and removed, some surfaces of the upper dielectric layer 123 may be exposed to expose the upper dielectric layer ( The protective layer 124 is also formed on the surface exposed in the gap, that is, the surface of the upper dielectric layer etched away. The protective layer 124 prevents damage to the upper dielectric layer 123 due to the sputtering of plasma particles and lowers the discharge voltage and the sustain voltage by emitting secondary electrons. In general, magnesium oxide (MgO) Is done.

Surrounded by the partition wall 113 to reach the gap 130 is all the discharge space, the discharge gas made of Xe, Ne or a mixture thereof is injected into the discharge space.

FIG. 5 is a projection view taken along line II ′ of FIG. 4. Therefore, in FIG. 5, only one discharge cell is the projection view seen from the top.

Referring to FIG. 5, bus electrodes 122a and 122b extending in parallel in a discharge space surrounded by the partition wall 113 are disposed and stripe sustain electrodes 121a are disposed on the bus electrodes 122a and 122b. , 121b) are formed parallel to each other. A gap 130 (FIG. 4) is formed between the sustain electrodes 121a and 121b and the phosphor layer 115 is coated inside the groove 132 formed on the bottom surface of the front substrate exposed to the gap.

The phosphor layer 115 has a component for generating visible light by receiving ultraviolet rays. The phosphor layer formed on the red light emitting subpixel includes phosphors such as Y (V, P) O4: Eu, and is formed on the green light emitting subpixel. The phosphor layer includes phosphors such as Zn 2 SiO 4: Mn, YBO 3: Tb, and the phosphor layer formed on the blue light emitting subpixel preferably includes phosphors such as BAM: Eu.

In the plasma display panel according to the preferred embodiment of the present invention having the above configuration, the address discharge is applied by applying an address voltage between the address electrode 111 and the X electrode which is one of the sustain electrodes 121a and 121b. This occurs, and as a result of this address discharge, a discharge cell in which sustain discharge is to be generated is selected from a plurality of discharge cells.

Thereafter, when a sustain discharge voltage, which is an alternating current, is applied between the X electrode and the other electrode of the sustain electrode pair of the selected discharge cell, sustain discharge occurs between the X electrode and the Y electrode. Ultraviolet rays are emitted while the energy level of the discharged gas excited by this sustain discharge is lowered. The ultraviolet rays excite the phosphor layer 116 applied to the upper surface of the phosphor layer 115 and the lower dielectric layer 112 applied inside the groove 132 formed in the gap 130 of the discharge cell. As the energy levels of the phosphor layers 115 and 116 are lowered, visible light is emitted, and the visible light emitted in this process constitutes an image.

6 and 7 illustrate a plasma display panel according to a second exemplary embodiment of the present invention when the shape of the sustain electrodes is a “T” shape instead of a stripe shape. The plasma display panel according to the second embodiment is substantially similar in structure to the plasma display panel shown in FIGS. 3 to 5. In FIG. 6, only the front substrate is rotated by 90 ° to more clearly show the internal structure of the plasma display panel.

The plasma display panel according to the second embodiment includes a back substrate 210, a plurality of address electrodes 211 formed on the top surface of the back substrate 210, and the address electrodes on the top surface of the back substrate 210. A lower dielectric layer 212 is formed to fill the (211). A partition wall 213 is formed on the lower dielectric layer 212 to partition a discharge cell as a discharge space. In addition, the phosphor layer 216 is coated on the upper surface of the lower dielectric layer 212 partitioned by the partition wall 213 and the discharge space surrounded by the partition wall 213.

The front substrate 220 is coupled to the rear substrate 210 to form a discharge space above the barrier rib 213, and is formed on the bottom surface of the front substrate 220 to intersect the address electrode 211. The sustain electrodes 221a and 221b having an “T” shape having an angle are formed in pairs.

The sustain electrodes 221a and 221b are mainly made of a transparent conductive material such as ITO to transmit visible light. In order to reduce the line resistance of the sustain electrodes 221a and 221b, the bus electrodes 222a and 222b made of metal are formed on the outer side of each of the sustain electrodes 221a and 221b. It is formed by making the width narrower than the protruding length of. The sustain electrodes 221a and 221b and the bus electrodes 222a and 222b are buried by the transparent upper dielectric layer 223.

On the other hand, a portion of the upper dielectric layer 223 is etched away so that the upper plate including the front substrate 220 has a ridge structure. Specifically, a portion of the upper dielectric layer 223 that is filled between the pair of sustain electrodes 221a and 221b is etched and removed, so that the gap of the lower surface of the front substrate 220 is exposed to the portion where the dielectric layer is removed. 230 is formed.

On the other hand, by forming the gap 230, the upper dielectric layer 223 is removed to form red, blue, and green phosphor layers 215 in the space formed on the lower surface of the front substrate 220, respectively. In particular, the lower surface of the front substrate 220 exposed to the gap 230 is formed as a concave groove 232 as a separate space in which the phosphor layer 215 is formed.

The groove 232 preferably has a length smaller than the horizontal and vertical lengths of the discharge cells so that the grooves are positioned inside the sections of the discharge cells. In addition, since the phosphor layer 215 is applied to the inside of the groove 232, the groove should be formed to a depth enough to apply the phosphor layer to a predetermined thickness. It is preferable that the phosphor layer 215 is integrally formed not only on the inner bottom surface of the groove 232 but also on the inner side surface of the groove.

Meanwhile, the upper dielectric layer 223 is covered by the protective layer 224. In the gap 230 in which the upper dielectric layer 223 is etched and removed, some side surfaces of the upper dielectric layer 223 are not exposed, so the upper dielectric layer 223 is exposed. The protective layer 224 is also formed on the surface exposed in the gap. The protective layer 224 prevents damage to the upper dielectric layer 223 due to the sputtering of plasma particles and lowers the discharge voltage and the sustain voltage by emitting secondary electrons. In general, magnesium oxide (MgO) Is done.

FIG. 7 is a projection view taken along the line II-II ′ of FIG. 6. Therefore, FIG. 7 is a projection view seen from the top of only one discharge cell.

Referring to FIG. 7, bus electrodes 222a and 222b extending side by side in the discharge space surrounded by the partition wall 213 are disposed, and a side surface of the bus electrodes 222a and 222b is disposed in the section between the bus electrodes. "S-shaped sustain electrodes 221a and 221b are formed facing each other. A gap 230 (FIG. 6) is formed between the sustain electrodes 221a and 221b, and the phosphor layer 215 is coated inside the groove 232 formed on the lower surface of the front substrate exposed to the gap.

Through such a structure, while the sustain discharge occurs smoothly between the sustain electrodes 221a and 221b facing the gap 230, the phosphor layer 215 and the lower dielectric layer (coated inside the groove 232) The phosphor layer 216 applied to the upper surface of the 212 is excited to lower the energy level and emit visible light, thereby realizing an image.

The plasma display panel having the above structure as a preferred embodiment according to the present invention has the following effects.

First, since the surface area on which the phosphor layer is applied is increased, it is possible to form additional phosphor layers.

Second, as compared with the plasma display panel in which only one of the upper and lower plates is coated with phosphor, the luminance is increased under the same current and power conditions, and the efficiency is also increased.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (5)

Back substrate; Address electrodes disposed on the rear substrate and extending in one direction; A lower dielectric layer covering the address electrodes; Barrier ribs formed on the lower dielectric layer; A front substrate disposed in parallel with the rear substrate; Sustain electrode pairs disposed below the front substrate and extending to cross the address electrodes; An upper dielectric layer covering the sustain electrode pairs; A protective layer covering the upper dielectric layer; And And a discharge gas in a discharge cell partitioned by the partition wall, The phosphor layer is applied to the upper surface of the lower dielectric layer partitioned by the partition wall and the discharge space surrounded by the partition wall, and a gap in which the upper dielectric layer is etched is formed between the sustain electrode pairs of the discharge cell section, and the lower surface of the front substrate is formed. Grooves are additionally formed on the surface exposed by the gap, and a phosphor layer is also applied to the bottom and side surfaces of the grooves. delete delete The method of claim 1, And the groove is located inside a section of the discharge cell. delete

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