KR20070099130A - Plasma display panel - Google Patents

Abstract

A plasma display panel is provided to overcome negative influences such as a change of color temperature due to a yellowing effect by forming a light absorbing layer on a groove formed on a first substrate. A pair of substrates(111) are disposed at a predetermined interval from each other. A barrier rib is disposed between the substrates in order to form discharge cells. A first electrode(131) is disposed on one of the substrates and is formed of a visible light transmitting material. A second electrode(132) is disposed on the first electrode and includes Ag. An address electrode is disposed between the substrates and is disposed across the first and second electrodes. A phosphor layer is disposed within the discharge cells. The discharge cells are filled with discharge gas. One or more grooves(111a) are formed on the substrate on which the first electrode is disposed. A light absorbing layer(111b) is disposed in the groove. A width of the light absorbing layer is larger than or equal to a width of a yellowing surface caused by the second electrode.

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 an enlarged cross-sectional view taken along the line II-II of FIG. 1.

3 is a schematic enlarged cross-sectional view illustrating a state in which sustain electrodes are disposed according to a modification of the embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

100: plasma display panel 110: a pair of substrate

111, 211: first substrate 111a, 211a: groove

111b and 211b: Light absorbing layer 112: Second substrate

120: barrier ribs 130, 230: sustain electrodes

131 and 231: first electrode 132 and 232: second electrode

140: address electrode 150: phosphor layer

160: discharge cells 171, 271: first dielectric layer

172: second dielectric layer 180, 280: protective layer

232a: first layer 232b: second layer

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel capable of preventing image degradation due to yellowing.

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 obtain a desired image.

A conventional plasma display panel includes a front substrate and a rear substrate, and includes a plurality of electrodes, a dielectric layer, and partition walls between the front substrate and the rear substrate, and discharge gas is injected into the plasma display panel.

Among the electrodes of the conventional plasma display panel, the sustain electrode includes a transparent electrode disposed on the front substrate and a bus electrode disposed in close contact with the transparent electrode, wherein the bus electrode mainly contains silver (Ag) having high electrical conductivity. It has been made.

In general, in the process of manufacturing a plasma display panel, a process of firing at a high temperature of about 500 to 600 ° C. is essential for forming a dielectric layer or the like, and silver ions (Ag ⁺ ) It was often diffused around to form circular colloids.

The circular colloid of silver ions diffused in this way is visually yellow in color and is commonly referred to as "yellowing." When such yellowing occurs, color temperature decreases when white light is generated. There was a problem that the overall picture quality is also degraded.

The main object of the present invention is to provide a plasma display panel which can prevent the deterioration of image quality due to yellowing.

The present invention provides a pair of substrates spaced apart from each other at predetermined intervals, a partition wall disposed between the pair of substrates and defining a discharge cell together with the pair of substrates, and the pair of substrates. A first electrode including a material disposed on one inner surface and transmitting visible light, a second electrode disposed on the first electrode and including silver (Ag), and disposed between the pair of substrates And an address electrode intersecting the first electrode and the second electrode, a phosphor layer disposed in the discharge cell, and a discharge gas in the discharge cell, wherein the first electrode of the pair of substrates At least one groove is formed in the substrate to be disposed, and a light absorbing layer is disposed in the groove, wherein the width of the light absorbing layer is greater than or equal to the width of the yellowing generated by the second electrode. Provides a null.

Here, the first electrode may include ITO.

Here, the first electrode may have a stripe shape.

Here, the reference planes including side surfaces forming the width of the light absorbing layer among the virtual surfaces perpendicular to the first substrate may be determined, and at least one of the yellowings may be positioned between the reference planes.

Here, the color of the light absorbing layer may be made of a high blackness.

Here, the color with high blackness may be black.

Here, the second electrode may include a first layer including a material having a high blackness and a second layer formed in close contact with the first layer.

Here, the first layer may be formed in close contact with the first electrode.

Here, the second electrode may have a stripe shape.

Here, the address electrode may have a stripe shape.

The first dielectric layer may be further disposed between the pair of substrates to fill the first electrode and the second electrode.

Here, the method may further include a protective layer formed to cover at least a portion of the first dielectric layer.

The semiconductor device may further include a second dielectric layer disposed between the pair of substrates and filling the address electrode.

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

1 is a schematic partial cutaway perspective view of a plasma display panel according to an exemplary embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view taken along the line II-II of FIG. 1.

As shown in FIG. 1, a plasma display panel 100 according to an embodiment of the present invention includes a pair of substrate 110, a partition wall 120, sustain electrodes 130, address electrodes 140, and It is configured to include a phosphor layer 150.

The pair of substrates 110 may include a first substrate 111 and a second substrate 112. The first substrate 111 and the second substrate 112 may be spaced apart from each other at a predetermined interval and face each other. It is arranged to see. The first substrate 111 is made of transparent glass, so that visible light can be transmitted.

In the present embodiment, since the first substrate 111 is transparent, visible light generated by the discharge passes through the first substrate 111, but the present invention is not limited thereto. That is, the first substrate and the second substrate may be configured to be transparent at the same time. In addition, the first substrate and the second substrate of the present invention may be made of a semi-transparent material, it may be configured by embedding a color filter on the surface or inside.

The partition wall 120 is disposed between the pair of substrates 110, and the partition wall 120 maintains a discharge distance and partitions a discharge space together with the sustain electrodes 130 to form a discharge cell 160. It performs a function of preventing the electro-optic cross-talk (cross-talk) between the discharge cells 160.

In this embodiment, the cross-section of the discharge cell 160 partitioned by the partition wall 120 is shown as a square, the present invention is not limited to this, but also formed of a polygon, such as a triangle, a pentagon, or a circle, oval, etc. The partition wall may be formed in a stripe shape to form an open partition wall.

Meanwhile, grooves 111a are formed in the first substrate 111, and the grooves 111a are formed in a stripe shape.

The groove 111a is formed using a method such as sand blasting, glass cutting, etching, or the like, and the light absorbing layer 111b is disposed in the formed groove 111a.

The sustain electrodes 130 are composed of first electrodes 131 and second electrodes 132.

The first electrode 131 is disposed on the lower surface of the first substrate 111 in a stripe shape, and includes indium tin oxide (ITO), which is a material through which visible light is transmitted.

According to the present embodiment, the first electrode 131 includes an ITO material, but the present invention is not limited thereto. That is, the first electrode according to the present invention does not necessarily need to include an ITO material because it only needs to be made of a material having excellent electrical conductivity and transmitting visible light.

According to the present exemplary embodiment, a part of the first electrode 131 is disposed under the light absorbing layer 111b, but the present invention is not limited thereto. That is, according to the present invention, there is no particular limitation on the mutual position of the first electrode and the light absorbing layer. That is, according to the present invention, the first electrode may not be disposed below the light absorbing layer.

On the other hand, the light absorbing layer 111b has a black color as a whole. For this purpose, a material containing black pigment is prepared in the form of a paste, and the light absorbing layer 111b is formed by applying it to the groove 111a. Here, as the material of the light absorbing layer 111b, a black stripe or a black matrix material conventionally used may be used, or a new material capable of absorbing light may be used.

In the present exemplary embodiment, the light absorbing layer 111b absorbs visible light flowing from the outside of the plasma display panel 100, thereby improving contrast and improving yellowness 190 generated from the second electrode 132. ), The negative function of the yellowing 190 is prevented.

That is, as described above, the manufacturing process of the plasma display panel 100 includes a high temperature thermoplasticity process, and silver ions (Ag ⁺ ) are diffused from the second electrode 132 by the high temperature thermoplasticity process. The yellowing 190 is generated by forming a circular colloid.

The yellowing 190 flows out of the second electrode 132 and is positioned on the side surface of the second electrode 132 and the lower surface of the first electrode 131. The light absorbing layer is disposed above the yellowing 190. Since the 111b is made of black, the user may not visually see the yellowing 190 through the first substrate 111, and finally, the red, blue, and the like may be projected through the first substrate 111. Since the influence of the yellowing color 190 is hardly influenced when the false color of green visible light is synthesized, color purity and color temperature can be optimized.

According to the present embodiment, the color of the light absorbing layer 111b is formed using black, but the present invention is not limited thereto. That is, according to the present invention, the color of the light absorbing layer 111b does not necessarily need to use black. That is, the color of the light absorbing layer according to the present invention, by using the color, to improve the clear room contrast and at the same time the yellowing 190 is not visually well visible to the user, the color purity and color temperature change due to the yellowing 190 There is no particular limitation as long as the color can be prevented.

Meanwhile, the second electrode 132 is formed as a single layer. The second electrode 132 is formed by mixing a material such as silver (Ag) and a binder resin to form a paste, and then printing the lower surface of the first electrode 131.

Here, the relationship between the width C ₁ of the light absorbing layer 111b and the maximum width M ₁ of the yellowing 190 and the arrangement position of the second electrode 132 will be described.

As described above, the purpose of the light absorbing layer 111b is to improve the clear room contrast and to make the yellowing 190 almost invisible when the user looks at the first substrate 111 from the front of the first substrate 111. When the additive color of the red, blue, and green visible light projected through the first substrate 111 is mixed, the color of the yellow color 190 hardly affects negative effects such as a decrease in color temperature.

Therefore, the width C ₁ of the light absorbing layer 111b should be larger than the maximum width M _{1 of} the yellowing 190 formed, and the portion where the formed yellowing 190 is located has the width ( ₁ ) of the light absorbing layer 111b. It should be formed so as to be located between both sides (S ₁ ) constituting C ₁ ). This will be described in detail as follows.

First, the first reference plane A ₁ and the second reference plane A ₂ including the side surfaces S ₁ of any one light absorbing layer 111b among the virtual surfaces perpendicular to the first substrate 111 may be formed. Decide

Here, the width W _{1 of} the second electrode 132 and the second electrode 132 so that the formed yellowing surface 190 is located between the first reference plane A ₁ and the second reference plane A ₂ . Determine the location of.

That is, in the present embodiment, the shortest distance d ₁ between the side surface B ₁ of the second electrode 132 closest between the first reference plane A ₁ and the first reference plane A ₁ is 15 μm or more. , a, and the second reference surface (a ₂₎ with a further aspect the shortest distance (d ₂₎ between (B ₂₎ of the nearest second electrode 132 to the second reference surface (a ₂₎ so that they are at the 15㎛ The width W _{1 of} the second electrode 132 and the position of the second electrode 132 are determined. Here, the reason for determining the lower limit of the shortest distance d ₁ (d ₂ ) to 15 μm is that, as a result of repeated experiments, silver ions in a circular colloidal state of the second electrode 132 may flow. It is because the distance was confirmed to be less than 15 micrometers.

Here, an upper limit of the shortest distance d ₁ (d ₂ ) is determined according to the arrangement positions of the light absorbing layer 111b and the second electrode 132. That is, when the width C ₁ of the light absorbing layer 111b is fixed and the shortest distance d ₁ (d ₂ ) is too large, the width W ₁ of the second electrode 132 is reduced. Since the electrical resistance is increased, it is necessary to determine appropriately in consideration of the degree of resistance of the second electrode 132 and the like.

In addition, when the width W ₁ of the second electrode 132 is fixed and the shortest distance d ₁ (d ₂ ) becomes too large, the width C ₁ of the light absorbing layer 111b is accordingly made. Should be large. In this case, since the black light absorbing layer 111b blocks visible light from the discharge cells 160, a problem arises in that the aperture ratio is reduced to reduce the light emission luminance. It is preferable to appropriately determine the upper limit of the distance d ₁ (d ₂ ).

Meanwhile, the first dielectric layer 171 fills the first electrode 131 and the second electrode 132 and is formed on the first substrate 111.

The first dielectric layer 171 prevents direct conduction between sustain electrodes 130 during sustain discharge, prevents charged particles from directly colliding with sustain electrodes 130 and damages them, and induces charged particles to wall charge. However, PbO, B ₂ O ₃ , SiO _2, and the like are used as such dielectrics.

A protective layer 180 is formed on the lower surface of the first dielectric layer 171, and the protective layer 180 is made of magnesium oxide (MgO). The protective layer 180 prevents the sustain electrodes 130 from being damaged by the sputtering of plasma particles and lowers the discharge voltage by emitting secondary electrons.

Meanwhile, the address electrodes 140 are disposed in a stripe shape on the second substrate 112, and the address electrodes 140 function as scan electrodes among the sustain electrodes 130 disposed on the first substrate 111. The address discharge is performed together with the electrode.

The second dielectric layer 172 is formed on the second substrate 112 by filling the address electrodes 140, and the second dielectric layer 172 functions to protect the address electrodes 140.

On the other hand, the upper surface of the second dielectric layer 172 forming the lower surface of the discharge cell 160 and the side surface of the partition wall 120 is coated with a phosphor that emits visible light of blue, green, and red by ultraviolet rays, and thus the phosphor layer 150. ) Is formed.

The phosphor layer 150 is divided into a blue phosphor layer, a green phosphor layer, and a red phosphor layer according to the color of visible light emitting light. The phosphor layer 150 is formed in a row.

Each of the phosphor layers 150 has a function of receiving visible ultraviolet light and emitting visible light. The blue phosphor layer is formed by coating a phosphor of BaMgAl ₁₀ O ₁₇ : Eu material, and the green phosphor layer is formed of Zn ₂ SiO ₄ : Phosphors such as Mn are applied and formed, and a red phosphor layer is formed by applying phosphors such as Y (V, P) O ₄ : Eu.

After the first substrate 111 and the second substrate 112 are sealed, the space inside the assembled plasma display panel 100 is filled with air, thereby completely removing the air in the assembled plasma display panel 100. By exhausting, air is replaced with an appropriate discharge gas capable of increasing the efficiency of discharge. As the discharge gas, a mixed gas such as Ne-Xe, He-Xe, He-Ne-Xe is often used.

Next, the operation of the plasma display panel 100 according to the embodiment of the present invention will be described in detail.

After the assembly of the plasma display panel 100 and the injection of the discharge gas are completed, a predetermined address voltage is applied to the electrodes serving as the scan electrodes among the address electrodes 140 and the sustain electrodes 130 from an external power source. When applied, an address discharge occurs, and as a result of this address discharge, a discharge cell 160 in which sustain discharge occurs is selected.

After that, when the discharge sustain voltage is applied to the sustain electrodes 130 of the selected discharge cell 160, the sustain discharge is caused by the movement of the wall charges, and the energy level of the discharge gas excited during the sustain discharge is lowered. Is released.

In addition, the ultraviolet rays excite the phosphor 150 coated in the discharge cell 160. The energy level of the excited phosphor 150 is lowered to emit visible light, and the emitted visible light is emitted to the first substrate 111. Projecting the projected image forms an image that can be recognized by the user.

In this case, according to the present exemplary embodiment, the groove 111a is formed in the first substrate 111 and the light absorbing layer 111b is formed in the groove 111a, whereby the user is yellowed through the first substrate 111. Not only can barely be seen 190, but since the color of the yellowing 190 is hardly influenced during the synthesis of the visible colors of red, blue, and green visible light projected through the first substrate 111, the color purity And color temperature can be optimized, and accordingly, the image quality is improved.

In addition, according to the present exemplary embodiment, the light absorbing layer 111b absorbs visible light from the outside through the first substrate 111, thereby improving the clear room contrast of the plasma display panel 100.

Hereinafter, with reference to FIG. 3, one modification of the embodiment of the present invention will be described, but will be described mainly with respect to the matter different from the embodiment of the present invention.

3 is a schematic enlarged cross-sectional view illustrating a state in which sustain electrodes are disposed according to a modification of the embodiment of the present invention.

As shown in FIG. 3, the sustain electrodes 230 according to the modification of the exemplary embodiment of the present invention may include a first electrode 231 and a second electrode 232.

The first electrode 231 is disposed in a stripe shape on the lower surface of the first substrate 211 and includes ITO, which is a material through which visible light is transmitted.

Grooves 211a are formed in the first substrate 211, and the grooves 211a are formed in a stripe shape.

The groove 211a is formed using a method such as sand blasting, glass cutting, etching, etc., and the light absorbing layer 211b is disposed in the groove 211a.

According to one modified example of the present embodiment, one light absorbing layer 211b for covering the yellowing 290 generated from the second electrode 232 is formed corresponding to one yellowing 290 so that one second electrode ( Two light absorption layers 211b are formed in pairs 232 and spaced apart from each other.

In addition, according to one modification of the embodiment of the present invention, the second electrode 232 has two layers. That is, the second electrode 232 is composed of a first layer 232a and a second layer 232b. The first layer 232a is disposed on the lower surface of the first electrode 231 and the second layer 232b. ) Is disposed on the bottom surface of the first layer 232a.

The first layer 232a is formed by mixing a material such as silver (Ag), PbO and a binder resin, and a material having high blackness such as ruthenium (Ru) and cobalt (Co) to form a paste, and then forming the first electrode 231. Since it is formed on the lower surface of the), the overall blackness of the degree close to the black has a high color.

Such a first layer 232a has a high black color to absorb visible light well, and such a property is that the first layer enters from the outside of the first substrate 211 and passes through the first electrode 231. Since some visible light reaching 232a can be absorbed, even if the width of the light absorbing layer 211b is not as large as the light absorbing layer 111b of the present embodiment described above, excellent clear room contrast can be achieved.

The second layer 232b is formed by mixing a material such as silver (Ag) and a binder resin to form a paste, and then laminating the lower surface of the formed first layer 232a. It is formed to have the same width. The second layer 232b has a higher electrical conductivity than the first layer 232a and thus reduces electrical resistance.

According to one modified example of the present embodiment, the width of the first layer 232a and the width of the second layer 232b are formed to have the same width, but the present invention is not limited thereto. That is, according to the present invention, the width of the first layer and the width of the second layer may be formed differently. However, the width of the first layer and the second layer should be carefully designed so that the yellowing 290 flowing out in that case is covered by the light absorbing layer 211b.

Here, the width C ₂ of the light absorbing layer 211b should be larger than the maximum width M _{2 of} the yellowing 290 formed, and the portion where the formed yellowing 290 is located is the width (1) of the light absorbing layer 211b. It should be formed so as to be located between both sides (S ₂ ) constituting C ₂ ). This will be described in detail as follows.

First, the first reference plane A ₃ and the second reference plane A ₄ including the side surfaces S ₂ of any one light absorbing layer 211b among imaginary planes perpendicular to the first substrate 211 are formed. Decide

Here, the width W ₂ of the second electrode 232 and the second electrode 232 so that the formed yellowing side 290 is located between the first reference plane A ₃ and the second reference plane A ₄ . The position of and the position of the light absorbing layer 211b, the width (C ₂ ) is determined. In this case, the user may hardly see the yellowing 290 through the first substrate 211, and the yellowing 290 at the time of combining the red, blue, and green visible light projected through the first substrate 211. ) Can hardly affect the color, so color purity and color temperature can be optimized.

According to one modification of the present embodiment, the width C ₂ of the light absorbing layer 211b is formed to be larger than the maximum width M ₂ of the yellowing 290 formed, but the present invention is not limited thereto. That is, the width on the light absorption side of the present invention may be equal to the maximum width of the yellowing. However, preferably, the width of the light absorbing layer is larger than the maximum width of the yellowing is preferable in that the negative effect of the yellowing is reduced.

Meanwhile, the first dielectric layer 271 is disposed to fill the first electrode 231 and the second electrode 232, and the protective layer 280 is disposed on the bottom surface of the first dielectric layer 271.

At this time, according to a modification of the present embodiment, by forming the groove 211a in the first substrate 211, and the light absorbing layer 211b that can cover the yellowing 290 in the groove 211a, the color purity And color temperature can be optimized, accordingly, there is an advantage that the image quality of the plasma display panel is improved.

In addition, according to one modified example of the present embodiment, the first layer 232a made of the color having high blackness absorbs the visible light from the outside through the first substrate 211, thereby further improving the clear room contrast of the plasma display panel. We can plan more.

In addition, according to one modification of the present embodiment, since the width of the light absorbing layer 211b needs to be formed to be greater than or equal to the width of the yellowing 290, the width of the light absorbing layer 211b can be formed narrower than that of the present embodiment. In the formation of the 211a and the light absorbing layer 211b, there is an advantage of reducing the labor and manufacturing costs.

The configuration, operation, and effect of the plasma display panel according to one modification of the embodiment of the present invention other than the configuration, operation, and effect described above are the same as the configuration, operation, and effect of the plasma display panel according to the embodiment of the present invention. Therefore, the description thereof will be omitted.

As described above, the plasma display panel according to the present invention can overcome negative effects such as change in color temperature due to yellowing by forming a groove in the first substrate and forming an absorbing layer that can cover the yellowing in the groove. As a result, the image quality of the plasma display panel may be improved.

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 (13)

A pair of substrates spaced at predetermined intervals and facing each other; A partition wall disposed between the pair of substrates and defining a discharge cell together with the pair of substrates; A first electrode disposed on an inner surface of any one of the pair of substrates and including a material through which visible light is transmitted; A second electrode disposed on the first electrode and including silver (Ag); An address electrode disposed between the pair of substrates and disposed to intersect the first electrode and the second electrode; A phosphor layer disposed in the discharge cell; And Including the discharge gas in the discharge cell, At least one groove is formed in a substrate on which the first electrode is disposed among the pair of substrates, and a light absorbing layer is disposed in the groove, wherein the width of the light absorbing layer is larger than the width of the yellowing generated by the second electrode. Or a plasma display panel. The method of claim 1, And the first electrode comprises ITO. The method of claim 1, And the first electrode has a stripe shape. The method of claim 1, A reference surface including side surfaces constituting widths of the light absorbing layer among virtual surfaces perpendicular to the first substrate, wherein at least one of the yellowings is positioned between the reference surfaces. The method of claim 1, The color of the light absorbing layer is a plasma display panel having a high black color. The method of claim 5, The plasma display panel having high blackness is black. The method of claim 1, And the second electrode includes a first layer including a material having a high black color, and a second layer formed in close contact with the first layer. The method of claim 7, wherein And the first layer is formed in close contact with the first electrode. The method of claim 1, And the second electrode has a stripe shape. The method of claim 1, And the address electrode has a stripe shape. The method of claim 1, And a first dielectric layer disposed between the pair of substrates, the first dielectric layer filling the first electrode and the second electrode. The method of claim 1, And a protective layer formed to cover at least a portion of the first dielectric layer. The method of claim 1, And a second dielectric layer disposed between the pair of substrates and filling the address electrode.

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