KR100751349B1 - Plasma display panel - Google Patents

Abstract

An object of the present invention is to provide a plasma display panel which reduces reactive power, and in order to achieve this object, the present invention provides a space between a first front substrate on which an image is displayed and the first front substrate and a predetermined space. A front substrate having a dielectric constant of the predetermined space, the front substrate having a dielectric constant of the predetermined space lower than that of the first front substrate and the second front substrate, a rear substrate disposed in parallel with the front substrate, and Barrier ribs disposed between the front substrate and the rear substrate and defining discharge cells together with the front substrate and the rear substrate, sustain electrode pairs disposed on the rear surface of the second front substrate, and disposed in the discharge cells. Provided is a plasma display panel including a phosphor layer and a discharge gas in the discharge cells.

Description

Plasma display panel {Plasma display panel}

1 is a schematic partial cutaway perspective view of a plasma display panel according to an exemplary embodiment of the present invention.

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

3 is a cross-sectional view showing a sealing portion of the front substrate according to the embodiment of the present invention.

4 is a cross-sectional view of a plasma display panel according to a modification of the embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

100, 200: plasma display panel 110, 210: front substrate

111: first front substrate 112: second front substrate

113, 223: space 114, 224: connecting member

115, 225: sealing material 120, 220: back substrate

130: sustain electrode pair 131, 231: common electrode

132: scan electrode 140, 240: first dielectric layer

150, 250: protective layers 160, 260: address electrodes

170 and 270: second dielectric layers 180 and 280: partition walls

190, 290: discharge cells 191, 291: phosphor layer

221: first back substrate 222: second back substrate

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel for reducing reactive power.

Recently, a plasma display panel (PDP), which is drawing attention as a replacement for a conventional cathode ray tube display device, is discharged after a discharge gas is filled between two substrates on which a plurality of electrodes are formed. The phosphor formed in a predetermined pattern is excited by the ultraviolet rays generated thereby to emit visible light, thereby obtaining a desired image.

In general, a plasma display panel of an AC three-electrode surface discharge includes a front substrate on which an image is implemented, and a rear substrate disposed to be spaced apart from the front substrate, and the front substrate includes a pair of a common electrode and a scan electrode. A sustain electrode pair is formed, and an address electrode is disposed on the rear substrate to intersect the sustain electrode pair.

In the case of driving a conventional plasma display panel configured as described above, a discharge sustain voltage is applied to the sustain electrode pair. Since the front substrate also has a dielectric property, a displacement current flows through the front substrate. Then, only a part of the initially applied power is used for discharge, and the rest is consumed as reactive power by the displacement current.

In particular, the thicker the front board consumes more reactive power, so that a thin front board can be used to solve the above problems. However, since the front board becomes stiff, the front board becomes large. There was a problem in conveying and processing as the more bent.

SUMMARY OF THE INVENTION The present invention has been made to solve the conventional problems as described above, and a main object of the present invention is to construct a substrate on which a pair of sustain electrodes is disposed between a front substrate and a rear substrate, comprising two substrates, and between the two substrates. The present invention relates to a plasma display panel capable of reducing reactive power and compensating for stiffness by lowering a dielectric constant of a space.

In order to accomplish the above and other objects, the present invention provides a front substrate on which an image is displayed, a first rear substrate disposed in parallel with the front substrate, and a predetermined space with the first rear substrate. A second rear substrate disposed between and disposed between the front substrate and the rear substrate, the dielectric constant of the predetermined space being lower than that of the first rear substrate and the second rear substrate; Barrier ribs defining discharge cells together with the front substrate and the rear substrate, sustain electrode pairs disposed in front of the first rear substrate, a phosphor layer disposed in the discharge cells, and discharges in the discharge cells. It is achieved by providing a plasma display panel containing a gas.

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Here, the first back substrate may be made of glass.

Here, the second back substrate may include glass.

Here, the first back substrate may be made of a synthetic resin.

Here, the second back substrate may be made of a synthetic resin.

Here, the predetermined space may be maintained in a vacuum state.

Here, a material having a dielectric constant lower than that of the first back substrate and the second back substrate may be located in the predetermined space.

The material having a dielectric constant lower than that of the first back substrate and the second back substrate may be air.

The predetermined space may be formed by a connection member disposed at an edge between the first back substrate and the second back substrate.

Hereinafter, preferred embodiments will be described in detail with reference to the accompanying drawings.

1 is a schematic partial cutaway perspective view showing a plasma display panel according to an embodiment of the present invention, Figure 2 is a schematic cross-sectional view taken along the line II-II of Figure 1, Figure 3 is an embodiment of the present invention It is sectional drawing which shows the sealing part of the front substrate.

1, 2 and 3, the plasma display panel 100 according to an embodiment of the present invention is disposed parallel to the front substrate 110, spaced at a predetermined interval with respect to the front substrate 110. The back substrate 120 is provided.

The front substrate 110 is composed of a first front substrate 111 and a second front substrate 112.

The first front substrate 111 and the second front substrate 112 are formed to be transparent using glass as a main material, so that visible light can pass therethrough.

Although the first front substrate 111 and the second front substrate 112 of the present embodiment are composed of glass as a main material, the present invention is not limited thereto. That is, the material of the first front substrate and the second front substrate of the present invention is not particularly limited, and the material may be made of synthetic resin or the like.

The space 113 between the first front substrate 111 and the second front substrate 112 is maintained in a vacuum. For this purpose, the first front substrate 111 and the second front substrate 112 have a predetermined interval ( After sealing so as to have a d ₁ ), a gas such as air located between the first front substrate 111 and the second front substrate 112 is evacuated to a vacuum state. At this time, the size of the predetermined space 113 by the predetermined interval (d ₁ ) can be appropriately determined by the designer within the range that the reactive power can be sufficiently reduced, the front substrate 110 can be structurally stable. Can be.

That is, the operator may apply the edge between the first front substrate 111 and the second front substrate 112 so that the first front substrate 111 and the second front substrate 112 maintain a predetermined distance d ₁ . After the connection member 114 is disposed, the sealing member 115 is coated around the connection member 114 to seal the first front substrate 111 and the second front substrate 112.

As the encapsulant 115, frit, silicone, a solvent evaporation adhesive, or the like may be used.

The connection member 114 of the present embodiment is made of a material of glass, but the present invention is not limited thereto. That is, there is no particular limitation in the selection of the material of the connecting member of the present invention. For example, the connecting member of the present invention may be made of a synthetic resin material.

In the present embodiment, the connecting member 114 and the sealing material 115 are configured separately, but the present invention is not limited thereto, and the sealing material is thickly applied in place of the connecting member so that the sealing material has a predetermined interval d ₁ . It can also be performed to the function of the connecting member to maintain.

Meanwhile, the sustain electrode pair 130 in which the common electrode 131 and the scan electrode 132 are paired is disposed on the rear surface of the assembled front substrate 110, that is, the rear surface of the second front substrate 112. do.

The common electrode 131 includes a transparent electrode 131a and a bus electrode 131b, and the scan electrode 132 also includes a transparent electrode 132a and a bus electrode 132b.

The transparent electrodes 131a and 132a are formed by being bonded to the bus electrodes 131b and 132b, and indium tin oxide (ITO) is used as a material of the transparent electrodes 131a and 132a.

The first dielectric layer 140 is stacked on the rear surface of the front substrate 110 with the sustain electrode pair 130 buried therein. The first dielectric layer 140 has the adjacent common electrode 131 and the scan electrode 132 directly connected to each other during discharge. It prevents energization and prevents charged particles from directly colliding with and sustaining the pair of sustain electrodes 130. In addition, the first dielectric layer 140 has a function of inducing charged particles to accumulate wall charges. PbO, B ₂ O ₃ , SiO _2, and the like are used as the dielectric of the first dielectric layer 140.

A protective layer 150 is formed on the rear surface of the first dielectric layer 140, and the protective layer 150 is made of magnesium oxide (MgO). The protective layer 150 prevents the sustain electrode pairs 130 from being damaged by the sputtering of plasma particles and lowers the discharge voltage by emitting secondary electrons.

Meanwhile, the rear substrate 120 is also made of glass, and the address electrode 160 is formed in front of the rear substrate 120.

The second dielectric layer 170 is formed on the rear substrate 120 while filling the address electrode 160. The second dielectric layer 170 functions to protect the electrodes like the first dielectric layer 140.

A partition wall 180 is formed on the front surface of the second dielectric layer 170 to maintain a discharge distance and prevent electro-optical crosstalk, and the partition wall 180 partitions the discharge cell 190.

In the embodiment of the present invention, the shape of the cross section of the discharge cell 190 is limited to a rectangle, but the present invention is not limited thereto, and the shape of the cross section of the discharge cell 190 may be a polygon such as a rectangle, a triangle, a pentagon, Alternatively, the shape may be circular, elliptical, or the like, and the partition wall 180 may be formed in a stripe pattern to form an open shape.

Red, green, and blue phosphors are coated on each of the discharge cells 190 on the upper surface of the second dielectric layer 170 forming the lower surface of the discharge cell 190 and the sidewalls of the partition wall 180 to form the phosphor layer 191. Form.

The partition wall 180 is coated with a phosphor layer 191 having the same color as the vertical partition wall 180a which divides and partitions between the discharge cells 190 to which different phosphor layers 191 are applied among the discharge cells 190. The horizontal partition wall 180b divides and partitions between the discharge cells 190.

The phosphor layer 191 has a component that generates ultraviolet light by receiving ultraviolet rays, and each color includes a blue phosphor layer 191a, a green phosphor layer 191b, and a red phosphor layer 191c.

The blue phosphor layer 191a includes phosphors such as BAM: Eu, and the green phosphor layer 191b includes phosphors such as Zn ₂ SiO ₄ : Mn, and the red phosphor layer 191c is Y (V). , P) O ₄ : Eu and the like.

After the front substrate 110 and the rear substrate 120 are sealed, the space inside the assembled plasma display panel 100 is filled with air, thereby completely exhausting the air in the assembled plasma display panel 100. The air is replaced with an appropriate discharge gas that can increase the discharge efficiency. As the discharge gas, a mixed gas such as Ne-Xe, He-Xe, He-Ne-Xe is often used.

Hereinafter, the operation of the plasma display panel according to the present embodiment will be described.

When the address voltage is applied to the plasma display panel 110, an address discharge occurs and a discharge cell 190 to be discharged is selected, and then a discharge sustain voltage is applied to the sustain electrode pair 130 of the selected discharge cell 190. do. In this case, the front substrate 110 to which the sustain electrode pair 130 is attached also has a dielectric property, so that a displacement current is generated and consumes reactive power, but the first front substrate 111 and the second front substrate 112 are used. ), Since there is a vacuum space 113 having a lower dielectric constant than the first front substrate 111 and the second front substrate 112, reactive power can be reduced.

That is, if the displacement current is I, C is the capacitance, and dv / dt is the rate of change of voltage with respect to time, the following equation is established.

However, since the capacitance C is proportional to the dielectric constant, the lower the dielectric constant, the smaller the capacitance C becomes, and the smaller the capacitance C becomes, the lower the displacement current I becomes. When the displacement current I is lowered, the reactive power is reduced.

However, since the dielectric constant of the vacuum in the state of the space 113 of the present embodiment is lower than that of glass, which is the material of the front substrate 110, the front surface of the conventional plasma display panel made of glass only without the vacuum space 113 is provided. The reactive power is reduced compared with the case of employing the substrate.

On the other hand, when a sustain discharge voltage is applied to the sustain electrode pair 130 to generate a sustain discharge, the discharge gas is excited. After that, the energy level of the discharge gas excited during the sustain discharge is lowered to emit ultraviolet rays.

The ultraviolet rays excite the phosphors of the phosphor layer 191 applied in the discharge cell 190. Visible light is emitted as the energy level of the excited phosphors is lowered, and the emitted visible light is emitted from the second front substrate 112 and the first substrate. By passing through the front substrate 111, an image that can be recognized by the user is displayed.

As described above, in the plasma display panel 100 according to the exemplary embodiment of the present invention, the front substrate 110 on which the sustain electrode pairs 130 are disposed may be the first front substrate 111 and the second front substrate 112. The dielectric constant of the space 113 is made into the first front substrate 111 and the second front substrate 112 by vacuuming the space 113 between the first front substrate 111 and the second front substrate 112. By lowering the dielectric constant of), the reactive power can be reduced and the rigidity of the front substrate 110 can be compensated for.

Hereinafter, one modification of the embodiment of the present invention will be described with reference to FIG. 4, but the description will be mainly focused on matters different from the embodiment of the present invention.

4 is a cross-sectional view of a plasma display panel according to a modification of the embodiment of the present invention.

The plasma display panel 200 according to the modification of the embodiment of the present invention is a transmissive plasma display panel, and is configured to be symmetrical with the plasma display panel 100 of the embodiment of the present invention placed upside down.

That is, the plasma display panel 200 according to an embodiment of the present invention includes a sustain electrode pair (not shown) including a front substrate 210, a rear substrate 220, a common electrode 231, and a scan electrode (not shown). The first dielectric layer 240, the protective layer 250, the address electrode 260, the second dielectric layer 270, the partition wall 280, and the phosphor layer 291.

The front substrate 210 is formed of glass as a main material so that visible light can pass therethrough, and an address electrode 260 is formed on the rear surface of the front substrate 210.

The second dielectric layer 270 is formed under the front substrate 210 while filling the address electrode 260, and the second dielectric layer 270 functions to protect the address electrodes 260.

A barrier rib 280 is formed on a rear surface of the second dielectric layer 270 to maintain a discharge distance and prevent electro-optical crosstalk, and the barrier rib 280 partitions the discharge cell 290.

Red, green, and blue phosphors are applied to each of the discharge cells 290 on both the upper surface of the second dielectric layer 270 and the partition walls 280 forming the upper surface of the discharge cell 290, thereby forming the phosphor layer 291. Form.

The phosphor layer 291 has a component that generates ultraviolet light by receiving ultraviolet rays. The phosphor layer 291 is composed of a blue phosphor layer 291a, a green phosphor layer 291b, and a red phosphor layer 291c, respectively. Since the type of the phosphor that forms the phosphor layer is the same as that of the phosphor layer 191 of the first embodiment, the description thereof is omitted here.

On the other hand, the back substrate 220 is composed of a first back substrate 221 and a second back substrate 222, the first back substrate 221 and the second back substrate 222 is made of synthetic resin.

The space 223 between the first back substrate 221 and the second back substrate 222 is filled with air. For this purpose, the first back substrate 221 and the second front substrate 222 are predetermined. Seal so as to have an interval of d ₂ . At this time, the size of the predetermined space 223 by the predetermined interval (d ₂ ) can be appropriately determined by the designer within the range that the reactive power can be sufficiently reduced, the back substrate 220 can be structurally stable. Can be.

That is, the operator may have an edge between the first rear substrate 221 and the second rear substrate 222 such that the first rear substrate 221 and the second rear substrate 222 maintain a predetermined distance d ₂ . After arranging the connection member 224, the sealing member 225 is coated around the connection member 224 to seal the first back substrate 221 and the second back substrate 222.

As the encapsulant 225, frit, silicone, a solvent evaporation adhesive, or the like may be used.

The connecting member 224 of one modification of the present embodiment is made of a synthetic resin material, but the present invention is not limited thereto. That is, there is no particular limitation in the selection of the material of the connecting member of the present invention.

In one modified example of the present embodiment, the connecting member 224 and the sealing member 225 are separately configured, but the present invention is not limited thereto, and the sealing member may be thickly coated in place of the connecting member so that the sealing member has a predetermined interval ( d ₂ ) can also be performed to function as a connecting member for holding.

Meanwhile, a sustain electrode pair (not shown) in which a common electrode 231 and a scan electrode (not shown) are paired is disposed on the front surface of the assembled rear substrate 220, that is, the front surface of the first rear substrate 221. .

The common electrode 231 includes a transparent electrode 231a and a bus electrode 231b, and the scan electrode also includes a transparent electrode (not shown) and a bus electrode (not shown).

In one modified embodiment of the present invention, the common electrode 231 and the scan electrode (not shown) include a transparent electrode, but the common electrode and the scan electrode of the present invention are not limited thereto. That is, the common electrode and the scan electrode of the present invention do not need to be formed as a transparent electrode on the back substrate, and are made of a metal material having excellent conductivity and low resistance such as silver (Ag), aluminum (Al), or copper (Cu). Can be formed.

The first dielectric layer 240 is stacked on the front surface of the rear substrate 220 while the sustain electrode pair is buried. In the first dielectric layer 240, the adjacent common electrode 231 and the scan electrode (not shown) are directly energized during discharge. And prevents charged particles from directly colliding with and sustaining the pair of sustain electrodes. In addition, the first dielectric layer 240 has a function of inducing charged particles to accumulate wall charges. PbO, B ₂ O ₃ , SiO _2, and the like are used as the dielectric of the first dielectric layer 240.

A protective layer 250 is formed on the entire surface of the first dielectric layer 240, and the protective layer 250 is made of magnesium oxide (MgO). The protective layer 250 prevents the sustain electrode pairs from being damaged by the sputtering of plasma particles and lowers the discharge voltage by emitting secondary electrons.

Hereinafter, the operation of the plasma display panel according to the modification of the present embodiment will be described.

When the address voltage is applied to the plasma display panel 200, an address discharge occurs and a discharge cell 290 to be discharged is selected, and then a discharge sustain voltage is applied to the sustain electrode pair of the selected discharge cell 290. In this case, since the rear substrate 220 on which the sustain electrode pair is disposed also has a dielectric property, it consumes reactive power, but the space 223 between the first rear substrate 221 and the second rear substrate 222 Since the dielectric constant is filled with air, reactive power can be reduced.

That is, since the dielectric constant of air filled in the space 223 of the present embodiment is lower than that of the synthetic resin, which is the material of the back substrate 220, reactive power is higher than in the case of employing the front substrate of the conventional plasma display panel made of glass only. Will be reduced.

On the other hand, when the sustain discharge voltage is applied to the sustain electrode pair to generate a sustain discharge, the discharge gas is excited. After that, the energy level of the discharge gas excited during the sustain discharge is lowered to emit ultraviolet rays.

The ultraviolet rays excite the phosphors of the phosphor layer 291 applied in the discharge cell 290. Visible light is emitted while the energy level of the excited phosphors is lowered, and the emitted visible light passes through the front substrate 210. An image that can be recognized by the user is displayed.

As described above, the plasma display panel 200 according to the modified embodiment of the present invention includes a rear substrate 220 on which the sustain electrode pairs are arranged, including the first rear substrate 221 and the second rear substrate 222. In addition, by filling air in the space 223 between the first back substrate 221 and the second back substrate 222, the dielectric constant of the space 223 is increased by the first back substrate 221 and the second back substrate 222. By lowering the dielectric constant of), the reactive power can be reduced and the rigidity of the back substrate 220 can be compensated for.

As described above, according to the present invention, the substrate on which the sustain electrode pairs are disposed among the front substrate and the rear substrate is composed of two substrates, and the dielectric constant of the space between the two substrates is lowered, thereby reducing the reactive power. have.

In addition, by supplementing the rigidity by using two substrates of the front substrate and the rear substrate on which the storage electrode pairs are arranged, there is an effect of preventing the bending of the substrate on which the storage electrode pairs are arranged.

 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 (18)

delete delete delete delete delete delete delete delete delete A front substrate on which an image is displayed; And a first rear substrate disposed in parallel with the front substrate and a second rear substrate positioned with a predetermined space therebetween, wherein the dielectric constant of the predetermined space is determined by the first rear substrate and the first rear substrate; A back substrate having a lower dielectric constant than the second back substrate; A partition wall disposed between the front substrate and the rear substrate and defining discharge cells together with the front substrate and the rear substrate; Sustain electrode pairs disposed on the front surface of the first rear substrate; A phosphor layer disposed in the discharge cells; And And a discharge gas in the discharge cells. The method of claim 10, The first back substrate is a plasma display panel made of glass. The method of claim 10, And the second back substrate is made of glass. The method of claim 10, The first back substrate is a plasma display panel made of a synthetic resin. The method of claim 10, The second back substrate is a plasma display panel made of a synthetic resin. The method of claim 10, And the predetermined space is maintained in a vacuum state. The method of claim 10, And a material having a dielectric constant lower than that of the first back substrate and the second back substrate in the predetermined space. The method of claim 16, And a material having a dielectric constant lower than that of the first back substrate and the second back substrate is air. The method of claim 10, And the predetermined space is formed by a connection member disposed at an edge between the first back substrate and the second back substrate.

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