KR100719573B1 - Plasma display panel - Google Patents

Abstract

The present invention, the first substrate and the second substrate disposed to face each other; Barrier ribs disposed between the first substrate and the second substrate to partition discharge cells; Sustain electrode pairs disposed on the first substrate to extend in one direction and disposed to pass through the discharge cells; Address electrodes disposed to intersect the sustain electrode pairs; A first dielectric layer formed on the first substrate to cover the sustain electrode pairs; A second dielectric layer formed on the second substrate to cover the address electrodes; And a phosphor layer formed in the discharge cells, and wherein the thickness of the first dielectric layer varies depending on a corresponding position of the first substrate.

Description

Plasma display panel {Plasma display panel}

1 is a view schematically showing a luminance distribution according to a position of a panel in a conventional plasma display panel.

FIG. 2 is a partially cutaway perspective view schematically showing a plasma display panel according to an exemplary embodiment of the present invention.

3 is a cross-sectional view taken along line III-III of the plasma display panel of FIG. 2, and schematically illustrates changes in thickness of a front dielectric layer and height of a partition wall according to panel positions.

<Brief description of symbols for the main parts of the drawings>

100: plasma display panel,

111: first substrate, 115: first dielectric layer,

116: protective layer, 121: second substrate,

122: address electrode, 125: second dielectric layer,

130: bulkhead, 131, 132: sustain electrode,

170: discharge cell.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel, and more particularly, to a plasma display panel in which visible light due to discharge in a discharge cell is emitted to the outside through a front dielectric layer and a front substrate to display an image.

Recently, a plasma display panel, which is drawing attention as a replacement of 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 by the ultraviolet rays is excited to obtain a desired image.

A typical AC plasma display panel includes an upper plate that shows an image to a user and a lower plate that is coupled in parallel thereto. The sustain electrode is disposed on the front substrate of the top plate. The address electrode is disposed on the rear substrate of the lower substrate opposite to the surface on which the sustain electrode of the front substrate is disposed so as to intersect the sustain electrode.

A front dielectric layer and a back dielectric layer are formed on each surface of the front substrate on which the sustain electrodes are arranged and on the rear substrate on which the address electrodes are arranged, to embed the electrodes. A partition wall is formed between the upper plate and the lower plate to maintain the discharge distance and to prevent the electro-optic crosstalk between the discharge cells.

The space formed by the address electrode crossing the sustain electrode forms one discharge unit as a unit discharge cell. An image is represented by the discharge in each discharge cell, and visible light is emitted from the discharge cell through the front dielectric layer and the front substrate having light transparency.

1 is a view schematically showing a luminance distribution according to a position of a panel in a conventional plasma display panel.

Referring to the drawings, this is the luminance distribution according to the position of the panel when the front dielectric layer is formed with the same thickness between all the panels of the panel, and the same gray scale, or full white, is expressed. As shown, the luminance of the center portion of the panel is low, and the luminance of the edge portion may be relatively high.

That is, the center portion of the panel is expressed by the luminance of 195 cd / mm ² to 200 cd / mm ^2, the luminance gradually increased toward the edge portion of the panel, and the edge portion is 215 cd / mm ² to 220 cd / mm ^2. It can be seen that the brightness of the. In the case where the front dielectric layer is formed to have the same thickness between all the panels of the panel, even when expressing the same gray scale, the luminance expressed according to the position of the panel is different and thus there is a problem that the luminance uniformity is lowered.

An object of the present invention is to provide a plasma display panel which can improve the luminance uniformity of a panel by varying the thickness of the front dielectric layer according to the position of the panel and varying the transmittance of the front dielectric layer according to the position of the panel.

The present invention, the first substrate and the second substrate disposed to face each other; Barrier ribs disposed between the first substrate and the second substrate to partition discharge cells; Sustain electrode pairs disposed on the first substrate to extend in one direction and disposed to pass through the discharge cells; Address electrodes disposed to intersect the sustain electrode pairs; A first dielectric layer formed on the first substrate to cover the sustain electrode pairs; A second dielectric layer formed on the second substrate to cover the address electrodes; And a phosphor layer formed in the discharge cells, and wherein the thickness of the first dielectric layer varies depending on a corresponding position of the first substrate.

Preferably, the thickness of the first dielectric layer is proportional to the luminance represented by passing through the first dielectric layer and the first substrate when the thickness of the first dielectric layer is uniform.

When the thickness of the first dielectric layer is thin at a position where the luminance represented by passing through the first dielectric layer and the first substrate is low when the thickness of the first dielectric layer is uniform, and when the thickness of the first dielectric layer is uniform It is preferable to thick at a position where the luminance represented by passing through the first dielectric layer and the first substrate is high.

It is preferable that the thickness of the first dielectric layer is thinnest at the center portion and becomes thicker toward the edge portion.

The height of the partition is inversely proportional to the thickness of the corresponding position of the first dielectric layer

Preferably, the height of the partition wall is determined so that the sum of the thickness of the first dielectric layer and the height of the partition wall is the same for the entirety of the first substrate to which the partition wall corresponds.

It is preferable to further include a protective layer disposed to cover the surface of the first dielectric layer facing the second substrate and protecting the first dielectric layer.

Another aspect of the invention, the first substrate and the second substrate disposed to be opposed to each other; Barrier ribs disposed between the first substrate and the second substrate to partition discharge cells; Sustain electrode pairs disposed on the first substrate to extend in one direction and disposed to pass through the discharge cells; Address electrodes disposed to intersect the sustain electrode pairs; A first dielectric layer formed on the first substrate to cover the sustain electrode pairs; A second dielectric layer formed on the second substrate to cover the address electrodes; And a phosphor layer formed in the discharge cells, wherein the thickness of the first dielectric layer depends on a corresponding position of the first substrate, and the height of the partition wall is equal to the thickness of the first dielectric layer and the height of the partition wall. Provided is a plasma display panel whose sum is determined to be the same for the entirety of the corresponding first substrate.

When the thickness of the first dielectric layer is thin at a position where the luminance represented by passing through the first dielectric layer and the first substrate is low when the thickness of the first dielectric layer is uniform, and when the thickness of the first dielectric layer is uniform It is preferable to thick at a position where the luminance represented by passing through the first dielectric layer and the first substrate is high.

It is preferable that the thickness of the first dielectric layer is thinnest at the center portion and becomes thicker toward the edge portion.

According to the present invention, by varying the thickness of the front dielectric layer for each position of the panel, by varying the transmittance of the front dielectric layer according to the position of the panel, it is possible to improve the luminance uniformity of the panel.

Hereinafter, with reference to the accompanying drawings will be described in detail with respect to the present invention with reference to the preferred embodiment.

FIG. 2 is a partially cutaway perspective view schematically showing a plasma display panel according to an exemplary embodiment of the present invention. 3 is a cross-sectional view taken along line III-III of the plasma display panel of FIG. 2, and schematically illustrates changes in thickness of a front dielectric layer and height of a partition wall according to panel positions.

Referring to the drawings, there is shown an AC plasma display panel 100 according to a preferred embodiment of the present invention. The plasma display panel 100 according to the present invention includes a first substrate 111, a second substrate 121, sustain electrode pairs 131 and 132, address electrodes 122, a partition wall 130, and a protective layer ( 116, phosphor layers 123, a first dielectric layer 115, and a second dielectric layer 125.

In this case, the first substrate 111 becomes a front substrate, the second substrate 121 becomes, the first dielectric layer 115 becomes a front dielectric layer, and the second dielectric layer 125 becomes a rear dielectric layer. Can be.

The front substrate 111 and the rear substrate 121 are spaced apart from each other at predetermined intervals, and define a discharge space in which discharge occurs. The front substrate 111 and the rear substrate 121 is preferably formed using glass or the like having excellent visible light transmittance. However, the front substrate 111 and / or the rear substrate 121 may be colored to improve the clear room contrast.

The partition wall 130 is disposed between the front substrate 111 and the rear substrate 121. The partition wall 130 may be disposed on the rear dielectric layer 125 according to a process. The partition wall 130 divides the discharge space into a plurality of discharge cells 170, and serves to prevent optical / electric crosstalk between the discharge cells 170. 2 illustrates a stripe type in which a plurality of partitions 130 are arranged to extend in one direction to partition discharge cells, but is not limited thereto. That is, the partition wall 130 may be formed such that the discharge cells 170 have a polygonal shape such as a triangle, a pentagon, or a cross section such as a circle or an ellipse, or may be formed in an open type such as a stripe. In addition, the partition wall 130 may partition the discharge cells 170 in a waffle or delta arrangement.

The sustain electrode pairs 131 and 132 are disposed on the front substrate 111 facing the rear substrate 121. Each of the sustain electrode pairs refers to a pair of sustain electrodes 131 and 132 formed on the rear surface of the front substrate 111 so as to cause sustain discharge. On the front substrate 111, the pair of sustain electrodes are spaced at predetermined intervals. It is arranged in parallel.

One sustaining electrode of the pair of sustaining electrodes serves as a common electrode as the X electrode 131, and the other sustaining electrode serves as a scanning electrode as the Y electrode 132. In the present embodiment, the sustain electrode pairs are disposed on the front substrate 111, but the arrangement position of the sustain electrode pairs is not limited thereto. For example, the sustain electrode pairs may be spaced apart from each other at predetermined intervals in a direction toward the rear substrate 121 from the front substrate 111.

Each of the X electrode 131 and the Y electrode 132 includes transparent electrodes 131a and 132a and bus electrodes 131b and 132b. The transparent electrodes 131a and 132a are formed of a transparent material that is a conductor capable of causing a discharge and does not prevent the light emitted from the phosphor 123 from advancing to the front substrate 111. oxide).

However, transparent conductors such as ITO generally have a high resistance, and thus, when the sustain electrode is formed only of the transparent electrodes, a large voltage drop in the longitudinal direction consumes a lot of driving power and slows the response speed. To this end, bus electrodes 131b and 132b made of a metal material and formed in a narrow width are disposed on the transparent electrode. The bus electrode may be formed in a single layer structure using a metal such as Ag, Al, or Cu, but may be formed to have a multilayer structure such as Cr / Al / Cr. Such transparent electrodes and bus electrodes are formed using a photo etching method, a photolithography method, or the like.

Looking at the shape and arrangement of the X electrode 131 and the Y electrode 132 in detail, the bus electrodes 131b and 132b are spaced apart at predetermined intervals from the unit discharge cells 180 and disposed in parallel to each other. 180 extend across them. As described above, the transparent electrodes 131a and 132a are electrically connected to the bus electrodes 131b and 132b, and the rectangular transparent electrodes 131a and 132a may be discontinuously disposed for each unit discharge cell 180. . One side of the transparent electrodes 131a and 132a is connected to the bus electrodes 131b and 132b, and the other side thereof is disposed to face the center direction of the discharge cell 170.

The front dielectric layer 115 is formed on the front substrate 111 to fill the sustain electrode pairs 112. The front dielectric layer 115 prevents adjacent X electrodes 131 and Y electrodes 132 from being energized with each other, and at the same time, charged particles or electrons are applied to the X electrodes 131 and Y electrodes 132. It prevents directly colliding and damaging the X electrodes 131 and the Y electrodes 132. In addition, the front dielectric layer 115 performs a function of inducing charge. The front dielectric layer 115 is formed using PbO, B ₂ O ₃ , SiO _2, or the like.

The front dielectric layer 115 may vary in thickness depending on a corresponding position of the front substrate 111. The front dielectric layer 115 is formed so that its thickness is proportional to the luminance expressed through the front dielectric layer 115 and the front substrate 111 when the thickness of the front dielectric layer 115 is uniform. In other words, when the thickness of the front dielectric layer 115 is uniform, the thickness of the front dielectric layer 115 is high and the front dielectric layer (a high brightness is expressed through the front dielectric layer 115 and the front substrate 111). When the thickness of 115 is uniform, the front dielectric layer 115 is preferably formed thin at a position where the luminance represented by passing through the front dielectric layer 115 and the front substrate 111 is low. This is because the transmittance of light decreases when the thickness of the front dielectric layer 115 becomes thick.

Meanwhile, as shown in FIG. 1, when the thickness of the front dielectric layer 115 is uniform, the luminance expressed through the front dielectric layer 115 and the front substrate 111 is the lowest at the center of the panel, and the edge of the panel. It tends to get higher with wealth. Therefore, the thickness of the front dielectric layer 115 is made thin at the center of low luminance, and the thickness of the front dielectric layer 115 is made thick at the edge of high luminance. That is, it is preferable that the thickness of the front dielectric layer 115 is thinnest at the center of the panel and thicker toward the edge of the panel.

As a result, the transmittance of light is increased in the center portion of the panel to increase the luminance, and the transmittance of light is lowered at the edge portion and the luminance is lowered. As a result, the luminance expressed throughout the panel becomes uniform, and the luminance uniformity can be increased.

On the other hand, when the thickness of the front dielectric layer 115 is not uniform, if the height of the partition wall 130 is constant as in the usual case, an empty space may be formed between the front dielectric 115 and the partition wall 130 at the center portion. Can be. In this case, vibration and noise may occur when repeated high-pressure discharge occurs to display an image. Therefore, it is preferable that the height of the corresponding portion of the partition 130 depends on the thickness of the front dielectric layer 115.

The same is true for the entirety of the front substrate 111 corresponding to the sum of the thickness of the front dielectric layer 115 and the height of the partition wall 130 so that an empty space is not formed between the front dielectric 115 and the partition wall 130. As such, the height of the partition wall 130 may be determined. That is, the height of the partition wall 130 is preferably inversely proportional to the thickness of the front dielectric layer 115 at the corresponding position.

In this embodiment, the thickness of the front dielectric layer 115 is thinnest at the center portion and gradually thickens toward the edge portion. Therefore, it is preferable that the height of the partition wall 130 is also the highest in the center portion and gradually decreases toward the edge portion. Accordingly, even if the thickness of the front dielectric layer 115 varies depending on the position, the sum of the thickness of the front dielectric layer 115 and the height of the partition wall 130 is constant, such that the front substrate 111 and the rear substrate 121 are fixed. Since the space between them is constant with respect to the whole panel, and no empty space is formed therebetween, the problem of noise and vibration will not arise thereby.

In addition, the plasma display panel 100 may further include a protective layer 116 covering the front dielectric layer 115. The protective layer 116 prevents charged particles and electrons from colliding with the front dielectric layer 115 during the discharge and damaging the front dielectric layer 115.

In addition, the protective layer 116 emits a large amount of secondary electrons during discharge, thereby smoothing plasma discharge. The protective layer 116 performing this function is formed using a material having high secondary electron emission coefficient and high visible light transmittance. After the front dielectric layer 115 is formed, the protective layer 116 is formed into a thin film mainly by sputtering or electron beam deposition.

The address electrodes 122 are disposed on the back substrate 121 that faces the front substrate 111. The address electrodes 122 extend across the discharge cells 170 to intersect the X electrodes 131 and the Y electrodes 132.

The address electrodes 122 are used to generate an address discharge for facilitating sustain discharge between the X electrode 131 and the Y electrode 132, and more specifically, serve to lower a voltage for sustain discharge. The address discharge is a discharge that occurs between the Y electrode 132 and the address electrode 122. When the address discharge is completed, wall charges are accumulated on the Y electrode 132 side and the X electrode 131 side, whereby the X electrode 131 Sustain discharge between the electrode and the Y electrode 132 becomes easier.

The unit discharge cell 170 is formed by a space formed by the pair of X electrodes 131 and Y electrodes 132 and the address electrodes 122 intersecting the same.

The back dielectric layer 125 is formed on the back substrate 121 to fill the address electrode 122. The rear dielectric layer 125 is formed as a dielectric that can induce charge while preventing charged particles or electrons from colliding with the address electrodes 122 when they are discharged. Such dielectrics include PbO, B ₂ O ₃ , SiO ₂ and the like.

Red, green, and blue light emitting phosphor layers 123 are disposed on both sides of the barrier rib 130 formed on the rear dielectric layer 125 and on the front surface of the rear dielectric layer 125 on which the barrier 130 is not formed. The phosphor layers have a component for generating visible light by receiving ultraviolet rays, and the phosphor layer formed in the red light emitting discharge cell includes a phosphor such as Y (V, P) O ₄ : Eu and the like, and is formed in the green light emitting discharge cell. The layer includes phosphors such as Zn ₂ SiO ₄ : Mn, YBO ₃ : Tb, and the like, and the phosphor layer formed in the blue light emitting discharge cell includes phosphors such as BAM: Eu.

In addition, the discharge cells 170 are filled with a discharge gas in which neon (Ne), xenon (Xe), and the like are mixed, and in the state where the discharge gas is filled as described above, the front substrate and the rear substrate 111, 121. The front substrate and the rear substrate 111, 121 are sealed to each other by a sealing member such as frit glass formed at the edge of the edge.

Ultraviolet rays are emitted while the energy level of the discharged gas excited during the sustain discharge is lowered. The ultraviolet rays excite the phosphor coated in the discharge cell 170, and the visible light is emitted as the energy level of the excited phosphor 123 is lowered, which causes the front dielectric layer 115 and the front substrate 111 to pass through. As it passes through and exits, an image that can be recognized by a user is formed.

In the plasma display panel according to the present invention, by varying the thickness of the front dielectric layer for each panel position, the luminance uniformity of the panel may be improved by varying the transmittance of the front dielectric layer according to the position of the panel.

In addition, by changing the height of the partition wall formed between the front substrate and the rear substrate in accordance with the change in the thickness of the front dielectric layer, it is possible to prevent the formation of empty space due to the thickness difference of the front dielectric layer, it is possible to suppress the generation of noise.

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 (10)

A first substrate and a second substrate disposed to face each other; Barrier ribs disposed between the first substrate and the second substrate to partition discharge cells; Sustain electrode pairs disposed on the first substrate to extend in one direction and disposed to pass through the discharge cells; Address electrodes disposed to intersect the sustain electrode pairs; A first dielectric layer formed on the first substrate to cover the sustain electrode pairs; A second dielectric layer formed on the second substrate to cover the address electrodes; And A phosphor layer formed in the discharge cells, The thickness of the first dielectric layer depends on the corresponding position of the first substrate, And a height of the partition wall is inversely proportional to a thickness of a corresponding position of the first dielectric layer. The method of claim 1, And the thickness of the first dielectric layer is proportional to the luminance expressed through the first dielectric layer and the first substrate when the thickness of the first dielectric layer is uniform. The method of claim 2, The thickness of the first dielectric layer is thin at a position where the luminance represented by passing through the first dielectric layer and the first substrate is low when the thickness of the first dielectric layer is uniform, And a thick plasma display panel having a high luminance expressed through the first dielectric layer and the first substrate when the thickness of the first dielectric layer is uniform. The method of claim 1, The thickness of the first dielectric layer is the thinnest in the center portion, the plasma display panel becomes thicker toward the edge portion. delete The method of claim 1, And the height of the partition wall is determined so that the sum of the thickness of the first dielectric layer and the height of the partition wall is the same for the entirety of the first substrate to which the partition wall corresponds. The method of claim 1, And a protective layer disposed to cover a surface of the first dielectric layer facing the second substrate and protecting the first dielectric layer. A first substrate and a second substrate disposed to face each other; Barrier ribs disposed between the first substrate and the second substrate to partition discharge cells; Sustain electrode pairs disposed on the first substrate to extend in one direction and disposed to pass through the discharge cells; Address electrodes disposed to intersect the sustain electrode pairs; A first dielectric layer formed on the first substrate to cover the sustain electrode pairs; A second dielectric layer formed on the second substrate to cover the address electrodes; And A phosphor layer formed in the discharge cells, The thickness of the first dielectric layer depends on the corresponding position of the first substrate, And the height of the barrier rib is determined to be equal to the entirety of the first substrate to which the sum of the thickness of the first dielectric layer and the height of the barrier rib is corresponding. The method of claim 8, The thickness of the first dielectric layer is thin at a position where the luminance represented by passing through the first dielectric layer and the first substrate is low when the thickness of the first dielectric layer is uniform, And a thick plasma display panel having a high luminance expressed through the first dielectric layer and the first substrate when the thickness of the first dielectric layer is uniform. The method of claim 8, The thickness of the first dielectric layer is the thinnest in the center portion, the plasma display panel becomes thicker toward the edge portion.

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