KR100603364B1 - Plasma display panel - Google Patents

Abstract

An object of the present invention is to provide a plasma display panel with improved color purity. To achieve this object, the present invention provides a rear substrate, a front substrate spaced apart from the rear substrate, and between the front substrate and the rear substrate. And red, green, and blue discharge cells, the portions facing the red discharge cells are red, the portions facing the green discharge cells are green, and the portions facing the blue discharge cells are blue. Barrier ribs, sustain electrode pairs extending across the discharge cells, address electrodes extending across the discharge cells so as to intersect the sustain electrode pairs in each of the discharge cells, and the sustain electrode pairs covering the sustain electrode pairs. A dielectric layer, a second dielectric layer covering the address electrodes, and red, green, and blue light emitting fluorescent lights disposed in the red, green, and blue discharge cells, respectively; A plasma display panel comprising body layers and a discharge gas in the discharge cell is provided.

Description

Plasma display panel {Plasma display panel}

1 is a vertical cross-sectional view showing the internal structure of a conventional plasma display panel,

2 is a partially cutaway perspective view of the plasma display panel according to the first embodiment of the present invention;

3 is a vertical cross-sectional view showing the internal structure of the plasma display panel shown in FIG.

4 is a vertical cross-sectional view showing the internal structure of the plasma display panel according to the second embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

100, 200: plasma display panel

110: back substrate 112: sustain electrode pair

116: first dielectric layer 119: protective layer

120: front substrate 122: address electrode

126: second dielectric layer 128, 228: partition wall

129R: red light emitting phosphor layer 129G: green light emitting phosphor layer

129B: blue light emitting phosphor layer 130R, 230R: red discharge cell

130G, 230G: Green discharge cell 130B, 230B: Blue discharge cell

235R: Red Material Layer 235G: Green Material Layer

235B: Blue Material Layer

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel with improved color purity.

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. The plasma display panel may be classified into a direct current type and an alternating current type according to a discharge type. In the DC plasma display panel, the electrodes are exposed to the discharge space so that the movement of charged particles is directly performed between the corresponding electrodes. In the AC plasma display panel, at least one electrode is covered with a dielectric layer, so that the direct charges of the corresponding electrodes are mutually reduced. The discharge is performed by the electric field of the wall charge instead of the movement of.

1 is a cross-sectional view of a conventional AC three-electrode surface discharge plasma display panel 5 of the related art. "Front side" as used herein means the direction in which the image is displayed. Referring to FIG. 1, the plasma display panel 5 includes a rear substrate 10 and a front substrate 20 that face each other. A plurality of address electrodes 11 are arranged on the top surface of the back substrate 10, and the address electrodes 11 are embedded by the first dielectric layer 12. The partition 13 is red on the upper surface of the first dielectric layer 12. Green and blue discharge cells 14R, 14G, and 14B are partitioned. Red, green, and blue light emitting phosphor layers 15R, 15G, and 15B are respectively applied to the inner surface of the discharge cell 14 partitioned by the partition wall 13 to a predetermined thickness. The front substrate 20 is a transparent substrate through which visible light can be transmitted. The front substrate 20 is mainly made of glass and is coupled to the rear substrate 10 provided with the partition wall 13. On the bottom of the front substrate 20, sustain electrode pairs 30 are formed to intersect the address electrodes 11. One sustaining electrode of the pair of sustaining electrodes 30 is the X electrode 21, and the other sustaining electrode is the Y electrode 22. Each of the sustain electrodes 21 and 22 includes transparent electrodes 21a and 22a and bus electrodes 21b and 22b. The sustain electrode pairs 30 are buried by the transparent second dielectric layer 23, and a protective layer 24 is formed on the bottom of the second dielectric layer 23.

However, the color purity of the plasma display panel may be improved when the ratios of red light, green light, and blue light are increased in the red, green, and blue discharge cells 14R, 14G, and 14B, respectively. However, when visible light occurs in the red, green, and blue light emitting phosphor layers 15R, 15G, and 15B, it is generally generated by including visible light of an undesired color. For example, not only blue light but also green light or red light may be generated in the blue discharge cell. The visible light component of the color which is not so required has a problem of poor color purity of the plasma display panel.

In addition, since the sustain electrode pair is disposed on the bottom surface of the front substrate on which visible light is projected, there is a limit in the structure change to improve the luminous efficiency. In addition, since the protective layer is formed on the bottom of the second dielectric layer, there is a problem in that transmittance of visible light generated in the discharge cells is lowered.

The present invention has been made to solve the above problems, and an object thereof is to provide a plasma display panel with improved color purity.

In addition, another object of the present invention is to provide a plasma display panel in which a pair of sustain electrodes is disposed on a rear substrate, thereby improving transmittance of the front substrate.

In order to achieve the above and other objects, the present invention provides a rear substrate, a front substrate spaced apart from the rear substrate, and disposed between the front substrate and the rear substrate, red, green, blue discharge cells And a portion facing the red discharge cells has a red color, a portion facing the green discharge cells has a green color, and a portion facing the blue discharge cells has a blue partition wall, which extends across the discharge cells. Sustain electrode pairs, address electrodes extending across the discharge cells to intersect the sustain electrode pairs in each discharge cell, a first dielectric layer covering the sustain electrode pairs, and a second covering the address electrodes A dielectric layer, red, green, and blue light emitting phosphor layers disposed in the red, green, and blue discharge cells, respectively, and a discharge gas in the discharge cell. Provided is a plasma display panel.

In the present invention, it is preferable that the light emitting phosphor layers are disposed on at least side surfaces of the partition wall.

According to another aspect of the present invention, the present invention provides a rear substrate, a front substrate spaced apart from the rear substrate, and a partition wall disposed between the front substrate and the rear substrate and partitioning red, green, and blue discharge cells. And red, green, and blue material layers disposed on side surfaces of the partition wall partitioning the red, green, and blue discharge cells, sustain electrode pairs extending across the discharge cells, and in the discharge cells. Address electrodes extending across the discharge cells to intersect with the sustain electrode pairs, a first dielectric layer covering the sustain electrode pairs, a second dielectric layer covering the address electrodes, and the red, green, and blue discharge cells Provided are a plasma display panel including red, green, and blue light emitting phosphor layers disposed within each other, and a discharge gas in the discharge cells.

In the present invention, it is preferable that red, green, and blue light emitting phosphor layers are disposed on at least the red, green, and blue material layers, respectively.

In the present invention, the sustain electrode pairs are disposed on the back substrate, and the address electrodes are disposed on the front substrate. In addition, the red, green, and blue light emitting phosphor layers may be disposed between the sustain electrode pair and the front substrate.

(First Example )

FIG. 2 is an exploded perspective view showing a partial cutaway view of the plasma display panel 100 according to an exemplary embodiment of the present invention, and FIG. 3 is a vertical cross-sectional view showing the internal structure of the plasma display panel 100 shown in FIG. . In FIG. 3, the lower plate 160 is rotated 90 degrees to clearly show the internal structure of the plasma display panel 100.

2 and 3, the plasma display panel 100 according to the first embodiment of the present invention includes a top plate 150 and a bottom plate 160. The upper plate 150 includes a front substrate 120, and the lower plate 160 includes a rear substrate 110 disposed to face the front substrate 120. The back substrate 110 and the front substrate 120 are spaced at predetermined intervals to define a plurality of red, green, and blue discharge cells 130R, 130G, and 130B partitioned by the partition 128 therebetween.

On the back substrate 110, the sustain electrode pairs 112 are arranged in parallel at predetermined intervals. One sustaining electrode of the pair of sustaining electrodes 112 functions as a common electrode as the X electrode 113, and the other sustaining electrode functions as a scanning electrode as the Y electrode 114. The X electrodes 113 and the Y electrodes 114 are formed in a stripe shape.

The sustain electrode pairs 112 are buried by the first dielectric layer 116 formed on the top surface of the back substrate 110. The first dielectric layer 116 is directly energized between the adjacent X electrode 113 and the Y electrode 114, and positive or negative electrons collide directly with the sustain electrodes 113 and 114 so that the X electrode 113 and the Y electrode 114 ) To induce charges and to accumulate wall charges. In order to maximally suppress visible light generated in the discharge cells 130R, 130G, and 130B from being emitted to the outside through the rear substrate, the first dielectric layer 116 is preferably formed using a dielectric having high visible light reflectance. For example, a white pigment may be mixed with pastes of PbO, B ₂ O ₃ , and SiO ₂ , and then applied to the back substrate 110, and the first dielectric layer 116 may be formed through a drying and baking process.

The protective layer 119 is formed on the upper surface of the first dielectric layer 116. The protective layer 119 prevents the first dielectric layer 116 and the sustain electrode pair 112 from being damaged by the sputtering of plasma particles and lowers the discharge voltage by emitting secondary electrons. The protective layer 119 may be formed by applying magnesium oxide (MgO) to the upper surface of the first dielectric layer 116 to a predetermined thickness. The MgO layer 119 is mainly formed as a thin film by sputtering or E-beam epaporation.

The front substrate 120 is a transparent substrate through which visible light can be transmitted, and is mainly made of glass, and a plurality of address electrodes are formed on the bottom surface of each discharge cell 130 in a stripe shape intersecting the sustain electrode pairs 112. 122) are formed. The address electrodes 122 are used to generate an address discharge for facilitating sustain discharge between the X electrode 113 and the Y electrode 114. More specifically, the address electrodes 122 lower the voltage for sustain discharge. The address discharge is a discharge that occurs between the Y electrode 114 and the address electrode 122.

The address electrodes 122 are buried by the second dielectric layer 126 formed on the bottom surface of the front substrate 120. The second dielectric layer 126 may be formed by applying a transparent dielectric material on a bottom surface of the front substrate 120 to a predetermined thickness. The second dielectric layer 126 is formed as a dielectric that can induce charge while preventing positive ions or electrons from colliding with the address electrode 122 during discharge. Such dielectrics include PbO, B ₂ O ₃ , SiO ₂ and the like.

The partition wall 128 may be formed on the bottom surface of the second dielectric layer 126 to partition the red, green, and blue discharge cells 130R, 130G, and 130B, but the present invention is not limited thereto. 128 may be formed. In addition, although the partition wall 128 is illustrated in FIG. 3 as being divided into stripes, the present invention is not limited thereto, and as long as a plurality of discharge spaces can be formed, various types of partition walls, for example, an open partition such as a stripe, of course, may be used. It can be a closed bulkhead such as, waffle, matrix, delta, and the like. In addition, the closed partition wall may be formed such that the cross section of the discharge space is a polygon, such as a triangle, a pentagon, or a circle, an ellipse, or the like, in addition to the quadrangle.

In the present embodiment, the partition portion 128R facing the red discharge cells 130R is red, and the partition portion 128G facing the green discharge cells 130G is green and the blue discharge cells 130B are disposed. Opposite partition wall portions 128B are formed to have a blue color. Therefore, in the partition partitioning the red discharge cell 130R and the green discharge cell 130G, one side 128R is red and the other side 128G is green, and the green discharge cell 130G and the blue discharge cell are green. In the partition that partitions 130B, one side 128G is green and the other side 128B is blue. In addition, in the partition wall partitioning the red discharge cell 130R and the blue discharge cell 130B, one side 128R is red and the other side 128B is blue.

Red, green, and blue light emitting phosphor layers 129R, 129G, and 129B are respectively applied to a bottom surface of the second dielectric layer 126 between the side surfaces of the partition walls 128 and the partition walls 128. That is, a red light emitting phosphor layer 129R is disposed in the red discharge cells 130R, a green light emitting phosphor layer 129G is disposed in the green discharge cells 130G, and a blue light emission is disposed in the blue discharge cells 130B. The phosphor layer 129B is disposed. The red, green, and blue light emitting phosphor layers 129R, 129G, and 129B have a component that generates ultraviolet light by receiving ultraviolet rays, and the red light emitting phosphor layer 129R is such as Y (V, P) O ₄ : Eu. A phosphor, and the green light-emitting phosphor layer 129G includes a phosphor such as Zn ₂ SiO ₄ : Mn, and the blue light-emitting phosphor layer 129B includes a phosphor such as BAM: Eu and the like.

In the discharge cells 130, a discharge gas such as Ne, Xe, or a mixture thereof is injected.

In the plasma display panel 100 according to the present invention having the structure as described above, visible light emitted from the red, green, and blue light emitting phosphor layers 129R, 129G, and 129B passes through the front substrate 120 and is emitted to the outside. do. Therefore, the plurality of address electrodes 122 disposed on the bottom surface of the front substrate 120 are made of indium tin oxide (ITO), which is a transparent conductive material to allow visible light to pass therethrough, whereas the plurality of address electrodes 122 are disposed on the top surface of the back substrate 110. Since the sustain electrode pairs 112 do not require transparency, they may be made of a general conductive metal material. As described above, since the sustain electrode pairs 112 can be formed of a metal material having excellent conductivity such as Ag, Al, or Cu and low resistance, the response speed due to the discharge is fast, the signal is not distorted, It is possible to reduce the power consumption has a number of advantages.

On the other hand, since the address electrode 122 is made of ITO, which is a transparent conductive material having a relatively high resistance as described above, each of the address electrodes 122 has a bus electrode 124 made of a highly conductive metal material to reduce the line resistance. It is preferable to be connected. In this case, the bus electrodes 124 may also be buried together with the address electrode 122 by the second dielectric layer 126. As shown in FIG. 3, the bus electrodes 124 are formed side by side at a predetermined interval on each side of the address electrode 122. In addition, a bridge 125 is formed between the bus electrode 124 and the address electrode 122 to electrically connect them. Dogs can be provided. In addition, the bus electrode 124 may be disposed at a position corresponding to the partition wall 128 so as not to obstruct the transmission of visible light.

Referring to the operation of the plasma panel 100 according to the preferred embodiment of the present invention configured as described above are as follows.

An address discharge is generated by applying an address voltage between the address electrode 122 and the Y electrode 114. As a result of the address discharge, wall charges are accumulated on the electrodes, so that the discharge cells 130 for sustain discharge are selected.

After that, when a discharge holding voltage is applied between the X electrode 113 and the Y electrode 114 of the selected discharge cell 130, the wall charges accumulated on the X electrode 113 and the Y electrode 114 are maintained. A discharge is caused, and ultraviolet rays are emitted while the energy level of the discharge gas excited during this sustain discharge is lowered. The ultraviolet rays excite the red, green, and blue light emitting phosphors 129R, 129G, and 129B coated in the red, green, and blue discharge cells 130R, 130G, and 130B, respectively, and the excited red, blue, and green light emitting phosphors. Visible light is emitted as the energy level of (129R, 129G, 129B) is lowered.

On the other hand, visible light generated in the red light-emitting phosphor layer 129R mainly produces visible light having a wavelength of red light. At this time, among the visible light passing through the red phosphor layer 129R and incident on the red partition portion 128R, the red light is reflected and emitted to the outside through the front substrate 120, and the visible light having a color other than that. Is absorbed into the red partition portion 128R. Therefore, since the ratio of red light is increased among visible light emitted from the red discharge cell 130R to the outside, red color purity is improved. Similarly, among the visible light generated in the green discharge cell 130G, since visible light components other than green light are absorbed in the green partition wall portion 128G, the color purity of green in the green discharge cell 130G is improved. Further, among the visible light generated in the blue discharge cell 130B, visible light components other than blue light are absorbed in the blue partition portion 128B, so that the color purity of blue in the blue discharge cell 130B is improved.

As described above, the red, green, and blue light generated in the red, green, and blue discharge cells 130R, 130G, and 130B are transmitted through the second dielectric layer 126 and the front substrate 120, and thus can be recognized by the user. An image is formed.

Second Embodiment

4 is a vertical cross-sectional view showing an internal structure of the plasma display panel 200 according to the second embodiment of the present invention. In FIG. 4, only the bottom plate 160 is rotated 90 degrees to clearly show the internal structure of the plasma display panel 200. Here, the description will be focused on the differences from the above-described embodiments. Like reference numerals refer to like elements.

Referring to FIG. 4, the plasma display panel 200 includes a top plate 250 and a bottom plate 160. In addition, on the bottom of the second dielectric layer 126, a partition wall 228 dividing the space between the front substrate 120 and the back substrate 110 into a plurality of red, green, and blue discharge cells 230R, 230G, and 230B. ) Is formed. As described above, the partition wall 228 may be formed to have various shapes.

A red material layer 235R is disposed on a side surface of the partition wall partitioning the red discharge cells 230R, and a green material layer 235G is disposed on a side surface of the partition wall partitioning the green discharge cells 230G. In addition, a blue material layer 235B is disposed on a side surface of the partition wall that partitions the blue discharge cells 230B. The red, green, and blue light emitting phosphor layers 129R, 129G, and 129B are formed on the red, green, and blue material layers 235R, 235G, and 235B. In addition, the red, green, and blue light emitting phosphor layers 129R, 129G, and 129B may be formed on the bottom surface of the second dielectric layer 126 facing the red, green, and blue discharge cells 230R, 230G, and 230B. have.

Operation of the plasma display panel 200 according to the second embodiment having the above structure is similar to that of the first embodiment, and thus a detailed description thereof will be omitted. However, among the visible light generated by the red discharge cell 230R and transmitted through the red light emitting phosphor layer 129R and incident on the red material layer 235R, the red light is reflected again and exits through the front substrate 120. The visible light component having a color other than that is absorbed by the red material layer 235R. Therefore, the color purity of the red light emitted from the red discharge cell 230R is improved. In addition, the color purity of the green light and the blue light emitted from the green and blue discharge cells 230G and 203B is improved by the selective reflection and absorption mechanisms of the green material layer 235G and the blue material layer 235B. .

The plasma display panel according to the present invention has the following effects.

First, the color purity of visible light emitted from the red, green, and blue discharge cells is improved. Therefore, since a separate color filter is unnecessary, the number of steps is reduced and the cost is reduced.

Second, since the sustain electrode pair and the protective layer are disposed on the rear substrate, the transmittance of the front substrate is improved and the luminance is increased.

Third, since the first dielectric layer is formed using a material having a high visible light reflectance, the visible light emitted to the outside through the back substrate is reduced, thereby improving the overall luminance.

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 (12)

Back substrate; A front substrate spaced apart from the rear substrate; Disposed between the front substrate and the rear substrate, the red, green, and blue discharge cells are partitioned; the portions facing the red discharge cells are red, and the portions facing the green discharge cells are green; Opposite portions include: blue partition walls; Sustain electrode pairs disposed on the rear substrate; Address electrodes intersecting the sustain electrode pairs and disposed on the front substrate; A first dielectric layer covering the sustain electrode pairs; A second dielectric layer covering the address electrodes; Red, green, and blue light emitting phosphor layers disposed in the red, green, and blue discharge cells, respectively; And And a discharge gas in the discharge cell. The method of claim 1, And at least one light emitting phosphor layer on a side surface of the barrier rib. The method of claim 1, And the first dielectric layer is covered with a protective film. The method of claim 1, And the address electrodes are transparent. delete The method of claim 1, And the red, green, and blue light emitting phosphor layers are disposed between the sustain electrode pair and the front substrate. Back substrate; A front substrate spaced apart from the rear substrate; A partition wall disposed between the front substrate and the rear substrate and partitioning red, green, and blue discharge cells; Red, green, and blue material layers disposed on side surfaces of the partition walls defining the red, green, and blue discharge cells, respectively; Sustain electrode pairs disposed on the rear substrate; Address electrodes intersecting the sustain electrode pairs and disposed on the front substrate; A first dielectric layer covering the sustain electrode pairs; A second dielectric layer covering the address electrodes; Red, green, and blue light emitting phosphor layers disposed in the red, green, and blue discharge cells, respectively; And And a discharge gas in the discharge cell. The method of claim 7, wherein And at least one red, green, and blue light emitting phosphor layers on at least the red, green, and blue material layers, respectively. The method of claim 7, wherein And the first dielectric layer is covered with a protective film. The method of claim 7, wherein And the address electrodes are transparent. delete The method of claim 7, wherein And the red, green, and blue light emitting phosphor layers are disposed between the sustain electrode pair and the front substrate.

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