KR100615288B1 - Plasma Display Panel - Google Patents

Abstract

 According to a preferred embodiment of the present invention, a plasma display panel includes a rear substrate, sustain electrode pairs disposed above the rear substrate, a lower dielectric layer covering the sustain electrode pairs, a protective layer covering the lower dielectric layer, and the back surface. A front substrate disposed in parallel with the substrate, address electrodes having a predetermined shape disposed below the front substrate and extending to cross the sustain electrode pair, an upper dielectric layer covering the address electrodes, and a lower side of the upper dielectric layer; It includes a plurality of partition walls for partitioning the discharge cell, characterized in that the gap between the sustain electrode pairs of the discharge cell section is formed a etched phosphor layer on the gap of the upper surface of the back substrate is formed a gap.

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 a vertical 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 lower plate of a ridge structure according to a first embodiment of the present invention.

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

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

FIG. 6 is a transmission of the upper plate viewed from a cross section taken along the line II-II ′ of FIG. 4.

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

8 is a vertical exploded cross-sectional view of the plasma display panel of FIG. 7.

Explanation of symbols on the main parts of the drawings

110: front substrate 111: address electrode

112: upper dielectric layer 113: partition wall

115, 116: phosphor layer 120: back substrate

121a and 121b sustain electrode 123 lower dielectric layer

124: protective layer 130: gap

132 groove 111a ring part

111b: address line 134: opening

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 form a ridge structure on a lower plate made of a back substrate and a stack thereof, and an address electrode formed on the front substrate does not interfere with transmission of visible light. The present invention relates to a plasma display panel in which a shape is improved to improve luminance.

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. As used herein, "front" means the direction in which the image is displayed.

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 embedded 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 low voltage and efficiency, a dielectric is formed on the top plate having a laminated structure composed of sustain electrodes, an upper dielectric layer, and a 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 of the ridge structure, the phosphor layer is formed only inside the discharge cell surrounded by the partition wall, that is, the lower plate made of the back substrate and its stack, and the sustain electrode pair is disposed on the front substrate, Since the bus electrode is formed on the lower surface, there is a problem that the luminance is lowered by partially blocking the traveling path of visible light.

In order to solve the above problems, in the ridge type plasma display panel, the sustain electrode is disposed on the rear substrate, and the phosphor layer is formed in the gap where the lower dielectric layer of the rear substrate is etched, thereby resulting in luminance due to the position selection of the sustain electrode. It is an object of the present invention to provide a plasma display panel which can prevent brightness degradation and improve the brightness and efficiency by providing a ring-shaped ring portion through which light can pass, so that the address electrode formed on the front substrate does not block the path of visible light. .

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

Back substrate;

Sustain electrode pairs disposed above the rear substrate;

A lower dielectric layer covering the sustain electrode pairs;

A protective layer covering the lower dielectric layer;

A front substrate disposed in parallel with the rear substrate;

Address electrodes having a predetermined shape disposed under the front substrate and extending to cross the sustain electrode pair;

An upper dielectric layer covering the address electrodes; And

And a plurality of partition walls formed under the upper dielectric layer to partition discharge cells.

A gap in which a lower dielectric layer is etched is formed between the sustain electrode pairs of the discharge cell section, and a phosphor layer is coated on the gap on the upper surface of the rear substrate.

Here, the address electrodes have an annular ring portion and an address line.

The ring portion is formed at a position corresponding to the discharge cell.

The inner side of the annular ring portion is an empty structure.

On the other hand, the phosphor layer formed in the gap is applied to the exposed surface of the upper surface of the lower dielectric layer is etched.

Grooves for applying the phosphor are further formed on the exposed surface of the back substrate.

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

The phosphor layer is applied to the inside of the groove.

In the plasma display panel according to the second exemplary embodiment of the present invention, the phosphor layer may be additionally applied to the discharge cell surrounded by the bottom surface and the partition wall of the upper dielectric layer partitioned by the partition wall.

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 preferred embodiment of the present invention, Figure 4 is an exploded cross-sectional view of the plasma display panel of FIG. 4 is a cross-sectional view of the plasma display panel shown in FIG. 3 viewed obliquely from the right side to more clearly show the internal structure of the plasma display panel. In FIG. 3, a portion of the front substrate is cut away for convenience of description.

3 and 4 together, the plasma display panel according to the first embodiment of the present invention includes a plurality of addresses formed in a predetermined shape on the front substrate 110 and on the bottom surface of the front substrate 110. An electrode 111 and an upper dielectric layer 112 formed to bury the address electrode 111 at a lower surface of the front substrate 110. In addition, a partition wall 113 is formed below the upper dielectric layer 112 to prevent electrical and optical interference between the discharge cells by dividing the discharge cells as discharge spaces.

The rear substrate 120 is coupled to the front substrate 110 to form a discharge cell below the barrier rib 113, and is formed on an upper surface of the rear substrate 120 so as 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 address electrodes 111 are mainly made of a transparent conductive material such as indium tin oxide (ITO) to transmit visible light. On the other hand, the sustain electrode pair is preferably composed of a metal material of low electrical resistance. This is because the sustain electrode pair is formed on the rear substrate rather than the front substrate through which the image is transmitted, so it is not necessary to consider the light transmittance. Therefore, if the sustain electrode pair is made of a metallic material, a separate bus electrode as used in the prior art is unnecessary.

On the other hand, a portion of the lower dielectric layer 123 is etched and removed so that the lower plate made of the back substrate 120 and the laminate has a ridge structure. The etched form does not necessarily need to etch the lower dielectric layer vertically, but it is sufficient to form a ridge shape as the unetched surface of the lower dielectric layer protrudes relatively to the etched portion. Specifically, a portion of the lower dielectric layer 123 filled between the pair of sustain electrodes 121a and 121b is etched and removed to expose the upper surface of the back substrate 120 to the portion where the dielectric layer is removed. The gap 130 is formed.

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

The groove 132 is preferably placed at a position corresponding to the inside of the section of the discharge cell. 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 surface of the groove, it is preferable that the size of the groove is set so that the phosphor layer applied to the side surface 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.

On the other hand, the lower dielectric layer 123 is covered by the protective layer 124, a portion of the lower dielectric layer 123 may be exposed in the gap 130, the lower dielectric layer 123 is removed by etching the lower dielectric layer ( A protective layer 124 is also formed on the surface exposed in the gap, that is, the surface of the lower dielectric layer etched away. The protective layer 124 prevents damage to the lower 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.

On the other hand, unlike the sustain electrode, the address electrode formed on the bottom surface of the front substrate is not a simple stripe shape. In detail, the address electrode 111 has a structure in which an annular ring portion 111a and a stripe address line 111b are alternately provided. In addition, an opening 134 may be formed inside the annular ring portion 111a, and the opening 134 may be empty without filling the upper dielectric layer 112.

FIG. 5 is a transmission of a cross section taken along line II ′ of FIG. 4. Therefore, in FIG. 5, only one discharge cell is seen from above.

Referring to FIG. 5, a plurality of pairs of sustain electrodes 121a and 121b are formed to extend in parallel in a discharge space surrounded by the partition wall 113. 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 (FIG. 4) formed on the upper surface of the back substrate exposed to the gap. to be.

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.

FIG. 6 is a perspective view of a cross section taken along the line II-II ′ of FIG. 4, showing the shape of the address electrode.

Referring to FIG. 6, the address electrode 111 includes a stripe-shaped address line 111b and a ring-shaped ring portion 111a connected to the address line, and the ring portion 111a and the address line 111b may be formed. Alternatingly formed. The ring portion 111a corresponds to the edge of the partition wall so that the address line 111b of the address electrode 111 is not overlapped with the discharge cell as much as possible within the discharge cell partitioned by the partition wall 113. It is preferable to form so that performance may not fall.

In FIG. 6, the ring portion 111a of the address electrode 111 has a rectangular ring shape similar to a partition wall, but is not necessarily limited thereto. The ring portion 111a may not block the path of visible light at a position corresponding to the discharge cell. Any shape can be used as long as it is not.

In addition, an empty opening 134 is formed inside the annular ring portion 111a and visible light is transmitted through the opening. The address electrode 111 has a ring portion 111a in each section corresponding to the discharge cell, and has a stripe-shaped address line 111b in the section between the ring portion and the ring portion.

Here, the upper dielectric layer 112 aligned at a position corresponding to the inside of the ring portion 111a of the address electrode 111 formed on the front substrate, that is, the annular inner side 130 may not be etched and removed. However, the upper dielectric layer 112 is preferably formed of a material having excellent light transmittance for light transmittance.

In the plasma display panel according to the preferred embodiment of the present invention, the address voltage is applied between the address electrode 111 and the Y electrode which is one of the sustain electrodes 121a and 121b. A discharge occurs, and as a result of this address discharge, a discharge cell in which sustain discharge is to be selected from among a plurality of discharge cells is selected.

Thereafter, when a sustain discharge voltage, which is an alternating current, is applied between the Y electrode and the other X 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 115 applied to the inside of the groove 132 formed in the gap 130 of the discharge cell. The energy level of the excited phosphor layer 115 is lowered so that visible light is emitted. Then, the visible light emitted by this process constitutes an image.

7 and 8 illustrate a plasma display panel according to a second preferred embodiment of the present invention. 7 is an exploded perspective view of a plasma display panel according to a second exemplary embodiment of the present invention, and FIG. 8 is an exploded cross-sectional view of the plasma display panel of FIG. 7. FIG. 8 is a cross-sectional view of the plasma display panel shown in FIG. 7 viewed obliquely from the right side to more clearly show the internal structure of the plasma display panel. In FIG. 7, a portion of the front substrate is cut away for convenience of description. 7 and 8, the same reference numerals are used for the same components as those constituting the plasma display panel of the first embodiment.

Referring to FIGS. 7 and 8, the plasma display panel according to the second exemplary embodiment of the present invention includes a plurality of addresses formed in a predetermined shape on the front substrate 110 and a lower surface of the front substrate 110. An electrode 111 and an upper dielectric layer 112 formed to bury the address electrode 111 on the lower surface of the front substrate 110. In addition, a partition wall 113 is formed below the upper dielectric layer 112 to prevent electrical and optical interference between the discharge cells by dividing the discharge cells as discharge spaces.

On the other hand, unlike the first embodiment, the phosphor layer 116 is also applied to the lower surface of the upper dielectric layer 112 partitioned by the partition wall 113 and the discharge space surrounded by the partition wall 113.

The rear substrate 120 is coupled to the front substrate 110 to form a discharge cell below the barrier rib 113, and is formed on an upper surface of the rear substrate 120 so as 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 address electrodes 111 are mainly made of a transparent conductive material such as indium tin oxide (ITO) to transmit visible light. On the other hand, the sustain electrode pair is preferably composed of a metal material of low electrical resistance. This is because the sustain electrode pair is formed on the rear substrate rather than the front substrate through which the image is transmitted, so it is not necessary to consider the light transmittance. Therefore, if the sustain electrode pair is made of a metallic material, a separate bus electrode as used in the prior art is unnecessary.

On the other hand, a portion of the lower dielectric layer 123 is etched and removed so that the lower plate made of the back substrate 120 and the laminate has a ridge structure. The etched form does not necessarily need to etch the lower dielectric layer vertically, but it is sufficient to form a ridge shape as the unetched surface of the lower dielectric layer protrudes relatively to the etched portion. Specifically, a portion of the lower dielectric layer 123 filled between the pair of sustain electrodes 121a and 121b is etched and removed to expose the upper surface of the back substrate 120 to the portion where the dielectric layer is removed. The gap 130 is formed.

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

The groove 132 is preferably placed at a position corresponding to the inside of the section of the discharge cell. 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.

On the other hand, the lower dielectric layer 123 is covered by the protective layer 124, a portion of the lower dielectric layer 123 may be exposed in the gap 130, the lower dielectric layer 123 is removed by etching the lower dielectric layer ( A protective layer 124 is also formed on the surface exposed in the gap, that is, the surface of the lower dielectric layer etched away. The protective layer 124 serves to prevent damage to the lower dielectric layer 123 due to the sputtering of plasma particles, and to discharge secondary electrons to lower the discharge voltage and the sustain voltage. In general, magnesium oxide (MgO) )

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.

On the other hand, unlike the sustain electrode, the address electrode formed on the bottom surface of the front substrate is not a simple stripe shape. In detail, the address electrode 111 has a structure in which an annular ring portion 111a and a stripe address line 111b are alternately provided. In addition, an opening 134 may be formed inside the annular ring portion 111a, and the opening 134 may be empty without filling the upper dielectric layer 112.

As described in the first embodiment, a projection view of the cross section taken along the line III-III 'of FIG. 8 is shown in FIG. Therefore, in FIG. 5, only one discharge cell is the projection view seen from the top.

Referring again to FIG. 5, a plurality of sustain electrodes 121a and 121b extending in parallel in a discharge space surrounded by the partition wall 113 are formed. The gap 130 is formed between the sustain electrodes 121a and 121b and the phosphor layer 115 is coated inside the groove 132 formed on the upper surface of the rear substrate exposed to the gap. to be.

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.

A perspective view of a cross section taken along the line IV-IV 'of FIG. 8 is shown in FIG. 6, showing the shape of the address electrode.

Referring to FIG. 6, the address electrode 111 includes a stripe-shaped address line 111b and an annular ring portion 111a connected to the address line, and the ring portion 111a and the address line 111b alternately. It is formed repeatedly. The ring portion 111a corresponds to the edge of the partition wall so that the address line 111b of the address electrode 111 is not overlapped with the discharge cell as much as possible within the discharge cell partitioned by the partition wall 113. It is preferable to form so that performance may not fall.

In FIG. 6, the ring portion 111a of the address electrode 111 has a rectangular ring shape similar to a partition wall, but is not necessarily limited thereto. The ring portion 111a may not block the path of visible light at a position corresponding to the discharge cell. Any shape can be used as long as it is not.

In addition, an empty opening 134 is formed inside the annular ring portion 111a and visible light is transmitted through the opening. The address electrode 111 has a ring portion 111a in each section corresponding to the discharge cell, and has a stripe-shaped address line 111b in the section between the ring portion and the ring portion.

Here, the upper dielectric layer 112 aligned at a position corresponding to the inside of the ring portion 111a of the address electrode 111 formed on the front substrate, that is, the annular inner side 130 may not be etched and removed. However, the upper dielectric layer 112 is preferably formed of a material having excellent light transmittance for light transmittance.

In the plasma display panel according to the second embodiment of the present invention described above, unlike the first embodiment, the phosphor layer is not formed only in the groove 132, but the discharge space partitioned by the partition wall 113 on the front substrate. It is also formed so that the area on which the phosphor layer is applied is increased.

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

First, since the sustain electrode pair is disposed on the rear substrate in the plasma display panel having a ridge structure, the sustain electrode pair can be formed of a material having excellent battery conductivity.

Second, an annular ring portion is formed at a position corresponding to the discharge cell section in the address electrode formed on the upper plate, thereby improving luminance.

Third, when the phosphor layer is formed at the same time in the discharge space partitioned by the inside of the groove formed in the rear substrate and the partition of the front substrate, it is possible to further form the phosphor layer because the selective surface area to which the phosphor layer can be applied is increased. .

Fourth, 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.

Fifth, since the surface discharge occurs through the gap formed between the sustain electrodes, the discharge voltage can be lowered.                     

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 (9)

Back substrate; Sustain electrode pairs disposed above the rear substrate; A lower dielectric layer covering the sustain electrode pairs; A protective layer covering the lower dielectric layer; A front substrate disposed in parallel with the rear substrate; Address electrodes having a predetermined shape disposed under the front substrate and extending to cross the sustain electrode pair; An upper dielectric layer covering the address electrodes; And And a plurality of partition walls formed under the upper dielectric layer to partition discharge cells. And a gap in which a lower dielectric layer is etched between the sustain electrode pairs of the discharge cell section, and a phosphor layer is coated on the gap on the upper surface of the rear substrate. The method of claim 1, And the address electrodes have an annular ring portion and an address line. The method of claim 2, And the ring portion is formed at a position corresponding to the discharge cell. The method of claim 3, wherein And an inner side of the annular ring portion is empty. The method of claim 4, wherein The phosphor layer formed in the gap is a plasma display panel, characterized in that the lower dielectric layer is etched and applied to the exposed surface of the upper surface of the back substrate. The method of claim 5, wherein And a groove for applying a phosphor is further formed on the exposed surface of the top surface of the back substrate. The method of claim 6, And the groove is located inside a section of the discharge cell. The method of claim 7, wherein And the phosphor layer is coated inside the groove. delete

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