KR100795784B1 - Plasma display panel - Google Patents

Abstract

An object of the present invention is to provide a plasma display panel having a reduced weight by forming a partition wall using plastics. To achieve this object, the present invention is arranged to be spaced apart from the rear substrate and the rear substrate. A transparent front substrate, disposed between the front substrate and the rear substrate, partitioning discharge cells, partition walls formed of plastic, pairs of discharge electrodes extending across the discharge cells, and the discharge electrodes in the discharge cells; A plasma display panel including address electrodes extending across the discharge cells so as to intersect with a pair, and a phosphor layer disposed in the discharge cells.

Description

Plasma display panel {Plasma display panel}

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

FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1 and shows a state in which the upper plate is rotated 90 degrees,

3 is an exploded perspective view of a plasma display panel according to a second embodiment of the present invention;

4 is a cross-sectional view taken along the line IV-IV of FIG. 3, showing a state in which the upper plate is rotated 90 degrees.

Explanation of symbols on the main parts of the drawings

100, 200: plasma display panel

111, 211: front substrate 112, 212: discharge electrode pair

115, 215: first dielectric layer 116, 216: protective layer

121, 221: back substrate 122, 222: address electrode

125, 225: first dielectric layer 126, 226: phosphor

128, 228: partition 131, 231: X electrode

132, 232: Y electrode 180, 280: 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 bulkheads are formed using plastic, thereby reducing the overall weight.

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.

In the case of the conventional plasma display panel, since the front substrate and the rear substrate are manufactured using a few milliliters (for example, 2.8 mm) of glass, the weight is very large overall. In addition to the front substrate and the back substrate, the bulkhead is a component that occupies a large part of the weight of the plasma display panel. Since the partition is manufactured using a dielectric paste of about 2.5 g / cm 3, the weight of the partition itself is also very large. In particular, in recent years, as the partitions are formed in a matrix form, since the volume of the partition walls increases as compared with the conventional stripe-shaped partition walls, there is a problem that the weight of the partition walls increases.

The present invention has been made to solve the above problems, and an object thereof is to provide a plasma display panel in which a weight is reduced by forming a partition wall using plastic.

In order to achieve the above object and other objects, the present invention is disposed on the rear substrate, the rear substrate spaced apart, the transparent front substrate, disposed between the front substrate and the rear substrate, and partitions the discharge cells A partition wall formed of plastic, discharge electrode pairs extending across the discharge cells, address electrodes extending across the discharge cells to intersect the discharge electrode pairs in the discharge cell, and disposed in the discharge cell; A plasma display panel having a phosphor layer is provided.

According to another aspect of the invention, the present invention is a plasma display panel having a lower plate and an upper plate disposed to face each other, wherein the upper plate is a front substrate, the sustain electrode pairs disposed on the front substrate, and the sustain electrode A first dielectric layer covering the pairs, wherein the lower plate includes a rear substrate disposed to face the front substrate, an address electrode disposed on the rear substrate, and crossing the sustain electrode pairs; 2. A plasma display panel comprising: a dielectric layer, a space between the front substrate and the rear substrate, divided into a plurality of discharge cells, a partition wall formed of plastic, and a phosphor layer disposed in the discharge cells. to provide.

According to another aspect of the present invention, the present invention provides a plasma display panel having a lower plate and an upper plate disposed to face each other, wherein the lower plate includes a rear substrate, sustain electrode pairs disposed on the rear substrate, and the holding plate. A first dielectric layer covering electrode pairs, wherein the top plate includes a front substrate disposed to face the rear substrate, an address electrode disposed on the front substrate, and intersecting the sustain electrode pairs; And a second dielectric layer covering the space, a space between the front substrate and the rear substrate, divided into a plurality of discharge cells, a partition wall formed of plastic, and a phosphor layer disposed in the discharge cells. The panel is provided.

In the present invention, the partition wall is selected from the group consisting of polymethylmethacrylate, polycarbonate, polyimide, glass epoxy, polytetrafluoroethylene (PTFE) It is preferably formed to include at least one.

(First embodiment)

1 and 2, a plasma display panel 100 according to a first embodiment of the present invention is shown. FIG. 1 is a partially cutaway perspective view of the plasma display panel 100, and FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1, and the upper plate is rotated 90 degrees. For convenience, the front substrate 111 direction (z direction) is the front side, and the rear substrate 121 direction (-z direction) indicates the rear side.

As shown, the plasma display panel 100 includes a top plate 150 and a bottom plate 160 coupled in parallel thereto. The top plate 150 includes a front substrate 111, a pair of sustain electrodes 112, The first dielectric layer 115 and the protective layer 116 are provided, and the lower plate 160 includes the back substrate 121, the address electrodes 122, the second dielectric layer 125, the partition wall 128, and the phosphor layer 126. ).

A plurality of discharge cells 180 are partitioned by partitions 128 between the front substrate 111 provided on the upper plate 150 and the rear substrate 121 provided on the lower plate 160. The partition 128 performs a function of preventing optical crosstalk between the discharge cells 180. In the present exemplary embodiment, the partition wall 128 includes horizontal partition portions 128a in the x direction and vertical partition portions 128b intersecting the horizontal partition portions 128a, and the discharge cells 180 form a rectangular cross section. It is formed to have. However, the shape of the partition wall is not limited thereto, and as long as it is possible to form a plurality of discharge spaces, the partition wall of various patterns, for example, an open partition wall such as a stripe, may be a closed partition wall such as a waffle, a matrix, a delta, and the like. Can be. In addition, the closed partition wall may be formed such that the cross section of the discharge space becomes a polygon, such as a triangle, a pentagon, or a circle, an ellipse, or the like, in addition to the rectangle as in the present embodiment.

In the present invention, the partition wall 128 is formed including plastic. At this time, the partition wall 128 is preferably formed using a material containing at least one of polymethyl methacrylate, polycarbonate, polyimide, glass epoxy, or polytetrafluoroethylene. Referring to Table 1, the densities of polymethylmethacrylate, polycarbonate, polyimide, glass epoxy and polytetrafluoroethylene are lower than common organic dielectric pastes. The general organic dielectric paste here is a material commonly used to make partitions. From Table 1, it can be seen that when the partitions of the same shape are manufactured, the partitions made of plastic become lighter. Therefore, the weight of the plasma display panel is reduced due to the weight reduction of the partition wall.

In addition, when the partition wall is formed using plastic, the manufacturing process of the plasma display panel is simplified. That is, after the top plate including the front substrate, the sustain electrode pairs, the first dielectric layer and the protective layer, and the bottom plate including the back substrate, the address electrodes and the second dielectric layer, respectively, are manufactured separately between the top plate and the bottom plate. By arranging and joining partition walls, a plasma display panel can be manufactured. Therefore, compared with the conventional method of manufacturing the partition wall after the formation of the second dielectric layer, a lower plate process is easier, and partition walls of various shapes can be easily manufactured using a molding method, a press method, and the like.

Table 1 Density comparison of common organic dielectric pastes and plastics

Density (g / cm 3) Common organic dielectric paste 2.5 Polymethyl methacrylate 1.19 Polycarbonate 1.2 Polyimide 1.2 Glass epoxy 1.6 to 2.2 Polytetrafluoroethylene 2.1 to 2.3

The storage electrode pairs 112 are disposed on the front substrate 111 of the upper plate 150. Since the visible light formed in the discharge cell 180 is transmitted through the front substrate 111, the front substrate 111 is formed of a transparent material mainly made of glass. In addition, the front substrate 111 is generally one having a thickness of several millimeters, but is not limited thereto.

The sustain electrode pair 112 refers to a pair of sustain electrodes 131 and 132 formed on the rear surface of the front substrate 111 to cause sustain discharge, and the sustain electrode pair 112 is formed on the front substrate 111. It is arranged in parallel at predetermined intervals. Each of the sustain electrode pairs 112 includes an X electrode 131 and a Y electrode 132. In the present embodiment, the sustain electrode pairs 112 are disposed on the rear surface of 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 the rear surface of the front substrate at predetermined intervals. However, the sustain electrode pairs are preferably disposed at the same level from the front substrate.

Each of the X electrode 131 and the Y electrode 132 includes protruding electrodes 131a and 132a and bus electrodes 131b and 132b. The bus electrode 131b of the X electrode and the bus electrode 132b of the Y electrode are spaced apart at predetermined intervals and extend across the discharge cells 180 in parallel with each other in the x direction. The bus electrodes 131b and 132b are made of metal and have a narrow width. 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.

Protruding electrodes 131a and 132a are electrically connected to each of the bus electrodes 131b and 132b. The protruding electrodes 131a and 132a are formed of a transparent material that is a conductor capable of causing a discharge and does not prevent light emitted from the phosphor 126 from advancing to the front substrate 111. Such a material is indium tin (ITO). oxide). However, transparent conductors such as ITO generally have high resistance, and thus, when the sustain electrode is formed only by the protruding electrode, the voltage drop in the longitudinal direction is large, driving power is consumed a lot, and the response speed is slowed. To this end, bus electrodes 131b and 132b made of a metal material and formed in a narrow width are disposed on the protruding electrode.

 In the present exemplary embodiment, the rectangular protruding electrodes 131a and 132a are discontinuously disposed for each unit discharge cell 180. However, the shape of the protruding electrode is not limited thereto, and may extend across the discharge cells similarly to the bus electrode. One end of the protruding electrodes 131a and 132a is electrically connected to the bus electrodes 131b and 132b, and the other end thereof is disposed in the direction of the center of the discharge cell 180.

The first dielectric layer 115 is formed on the front substrate 111 having the sustain electrode pairs 112 so as to fill the sustain electrode pairs 112. In the first dielectric layer 115, adjacent X electrodes 131 and Y electrodes 132 are energized with each other, and cations or electrons directly collide with the X electrodes 131 and Y electrodes 132 so that the X electrodes 131 and While preventing damage to the Y electrode 132, it is formed as a dielectric that can induce charge. Such dielectrics include PbO, B ₂ O ₃ , SiO _2, and the like.

The address electrodes 122 are disposed on the front surface of the rear substrate 121 opposite to the surface on which the storage electrode pairs 112 of the front substrate 111 are disposed. The address electrodes 122 extend across the discharge cells 180 to intersect the X electrode 131 and the Y electrode 132 in each discharge cell 180.

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 occurring between the Y electrode 132 and the address electrode 122. When the address discharge is completed, cations are accumulated on the Y electrode 132 side and electrons are accumulated on the X electrode 131 side. The sustain discharge between 131 and Y electrode 132 becomes easier.

The space formed by the pair of X electrodes 131 and Y electrodes 132 and the address electrodes 122 intersecting the same forms a discharge unit as the unit discharge cells 180.

The second dielectric layer 125 is formed on the back substrate 121 provided with the address electrode 122 to fill the address electrode 122. The second dielectric layer 125 is formed as a dielectric capable of inducing charge while preventing cations or electrons from colliding with the address electrode 122 during discharge and damaging the address electrode 122. Such dielectrics include PbO and B ₂ O ₃ , SiO ₂ and the like.

In addition, a protective layer 116 made of MgO is formed on the back surface of the first dielectric layer 115. The protective layer 116 prevents cations and electrons from colliding with the first dielectric layer 115 when the discharge damages the first dielectric layer 115, and has good light transmittance and emits a lot of secondary electrons during discharge. . In particular, the MgO layer 116 is formed into a thin film mainly using sputtering, electron beam deposition, or the like.

Red light emission, green light emission, and blue light emission phosphor layers 126 are formed on the entire surface of the second dielectric layer 125 between the partitions 128 partitioning the discharge cells 180. In addition, red, green, and blue light emitting phosphor layers 126 corresponding to the respective discharge cells are formed on the side surfaces of the partition wall 128.

The phosphor layer 126 has a component that generates ultraviolet light by receiving ultraviolet rays. The red phosphor layer formed in the red discharge cell includes a phosphor such as Y (V, P) O ₄ : Eu, and the green discharge cell. The red light emitting phosphor layer formed on the substrate includes a phosphor such as Zn ₂ SiO ₄ : Mn, and the blue light emitting phosphor layer formed on the blue discharge cell includes a phosphor such as BAM: Eu.

In addition, the discharge cells 180 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 and rear substrates 111 and 121 of the substrates are filled. The front substrate and the back substrates 111 and 121 are sealed to each other and joined by a sealing member such as frit glass formed at the edge thereof.

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

The plasma discharge generated in the plasma display panel 100 is largely divided into address discharge and sustain discharge. The address discharge is caused by the application of the address discharge voltage between the address electrode 122 and the Y electrode 132, and as a result of the address discharge, the discharge cell 180 in which the sustain discharge occurs is selected. Thereafter, when a discharge sustain voltage is applied between the X electrode 131 and the Y electrode 132 of the selected discharge cell 180, a sustain discharge is generated in the selected discharge cells 180 by the address discharge. 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 126 coated in the discharge cell 180. As the energy level of the excited phosphor 126 decreases, visible light is emitted, and the visible light is emitted from the first dielectric layer 115 and the front substrate. The light is transmitted through 111 to form an image that can be recognized by the user.

Second Embodiment

Hereinafter, a plasma display panel according to a second embodiment of the present invention will be described with reference to FIGS. 3 and 4.

3 is an exploded perspective view illustrating a partial cutaway view of the plasma display panel 200 according to the second embodiment of the present invention, and FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG. 3. In FIG. 4, the lower plate 260 is rotated 90 degrees to clearly show the internal structure of the plasma display panel 200.

3 and 4, the plasma display panel 200 according to the second embodiment of the present invention includes an upper plate 250 and a lower plate 260. The lower plate 260 includes a back substrate 221, sustain electrode pairs 212, a first dielectric layer 215, and a protective layer 216. The upper plate 250 includes a front substrate 211 and an address electrode 222. ), A second dielectric layer 225, a partition 228, and a phosphor layer 226.

The back substrate 221 and the front substrate 211 define a plurality of discharge cells 280 spaced apart at predetermined intervals and partitioned by partition walls 228 therebetween.

On the back substrate 221, the sustain electrode pairs 212 are arranged in parallel at predetermined intervals and extend in one direction (x direction). However, the arrangement position of the sustain electrode pairs 212 is not limited thereto. The sustain electrode pair 212 includes an X electrode 231 and a Y electrode 232. The X electrode 231 functions as a common electrode, and the Y electrode 232 functions as a scan electrode. The X electrodes 231 and the Y electrodes 232 are formed in a stripe shape.

The sustain electrode pairs 212 are buried by the first dielectric layer 215 formed on the top surface of the back substrate 221. The first dielectric layer 215 may be formed by applying a dielectric material to a front surface of the back substrate 221 to a predetermined thickness. The first dielectric layer 215 is formed as a dielectric that can induce charge while preventing cations or electrons from colliding with the sustain electrode pairs 212 and damaging the sustain electrode pairs 212 during discharge. PbO, B ₂ O ₃ , SiO ₂ and the like.

The protective layer 216 is preferably formed on the upper surface of the first dielectric layer 215. The function and material details of the protective layer 216 are the same as those of the first embodiment described above.

The front substrate 211 is a transparent substrate through which visible light can be transmitted. The front substrate 211 is made of glass. The bottom surface of the front substrate 211 has a stripe shape in a direction crossing the sustain electrode pairs 212 in the discharge cells 280 (y direction). Address electrodes 222 are formed. The address electrodes 222 are intended to cause an address discharge to facilitate sustain discharge between the X electrode 231 and the Y electrode 232, and more specifically, serve to lower a voltage for sustain discharge. The address discharge is a discharge that occurs between the Y electrode 231 and the address electrode 222.

The address electrodes 222 are buried by the second dielectric layer 225 formed on the bottom surface of the front substrate 220. The first dielectric layer 225 is formed as a dielectric that can induce charge while preventing cations or electrons from colliding with the sustain electrode pairs 212 and damaging the sustain electrode pairs 212 during discharge. and the like PbO, B2O _3, SiO _2.

A partition wall 228 is formed on the bottom of the second dielectric layer 226 to partition the plurality of discharge cells 280. Although the partition wall 228 is illustrated in FIG. 3 as being divided into stripes, the present invention is not limited thereto. As long as a plurality of discharge spaces can be formed, various partition walls, for example, an open partition such as a stripe, may be used. It can be a closed bulkhead, such as a waffle, matrix, delta, or 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.

As in the first embodiment, the partition 228 is formed of plastic. At this time, the partition wall 228 is preferably formed using a material containing at least one of polymethyl methacrylate, polycarbonate, polyimide, glass epoxy or polytetrafluoroethylene. As mentioned above, the density of polymethylmethacrylate, polycarbonate, polyimide, glass epoxy and polytetrafluoroethylene is lower than common organic dielectric pastes. Therefore, when manufacturing the partition of the same shape, it can be seen that the partition made of plastic is lighter. This means that the weight of the plasma display panel is reduced.

In addition, as described above, when the partition wall is formed using plastic, the manufacturing process of the plasma display panel is simplified. That is, the plasma display panel can be manufactured by manufacturing the upper plate and the lower plate except for the partition wall, and then separately arranging the partition wall between the upper plate and the lower plate. For the formation method of such a partition, refer to the first embodiment described above.

In the discharge cells 280, Ne, Xe, or a mixed discharge gas thereof is injected.

Red, green, and blue light emitting phosphor layers 226 are applied to a bottom surface of the second dielectric layer 225 between the sidewalls of the barrier ribs 228 and the barrier ribs 228, respectively. However, the position at which the phosphor layer is disposed is not limited thereto. In order to achieve a transmissive structure, the phosphor layer is preferably disposed between the front substrate and the sustain electrode pairs. The functional matters and the material matters of the phosphor layer 226 are similar to those of the first embodiment described above, and thus are omitted here.

In the plasma display panel 200 according to the present invention having the structure as described above, visible light emitted from the phosphor layer 226 passes through the front substrate 211 and is emitted forward (z direction). Accordingly, the plurality of address electrodes 222 disposed on the bottom surface of the front substrate 211 is 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 222 are disposed on the top surface of the back substrate 221. Since the sustain electrode pairs 212 do not require transparency, they may be made of a general conductive metal material. As described above, since the sustain electrode pairs 212 can be formed of a metal material having excellent conductivity such as Ag, Al, or Cu, and having low resistance, the response speed due to the discharge is high, the signal is not distorted, and is required for the sustain discharge. It is possible to reduce the power consumption has a number of advantages.

Meanwhile, since the address electrode 222 is made of ITO, which is a transparent conductive material having a relatively high resistance as described above, each of the address electrodes 222 is provided with a separate bus electrode made of a metallic material having excellent conductivity in order to reduce line resistance. can do.

The operation of the plasma panel 200 according to the second embodiment of the present invention configured as described above is as follows.

An address voltage is applied between the address electrode 222 and the Y electrode 232 to generate an address discharge. As a result of the address discharge, wall charges are accumulated on the electrodes, whereby a discharge cell 280 for sustain discharge is selected. Thereafter, when a discharge holding voltage is applied between the X electrode 231 and the Y electrode 232 of the selected discharge cell 280, the wall charges accumulated on the X electrode 231 and the Y electrode 232 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 phosphor 226 coated in the discharge cell 280. As the energy level of the excited phosphor 226 is lowered, visible light is emitted, and the visible light is emitted from the second dielectric layer 225 and the front substrate. It is emitted through the 211 to form an image that can be recognized by the user

In the plasma display panel according to the present invention, since the partition wall is formed of a low density plastic material, the weight of the plasma display panel is reduced. In addition, since the partition walls of various shapes can be easily manufactured by using the molding method, the press method, and the like, the manufacturing method of the plasma display panel is facilitated.

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 (7)

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 discharge cells and formed of plastic; Sustain electrode pairs extending across the discharge cells; Address electrodes extending across the discharge cells to intersect the sustain electrode pair in the discharge cell; And And a phosphor layer disposed in the discharge cell. The method of claim 1, The partition includes at least one selected from the group consisting of polymethylmethacrylate, polycarbonate, polyimide, glass epoxy, and polytetrafluoroethylene (PTFE). Plasma display panel, characterized in that formed. The method of claim 1, And a second dielectric layer covering the sustain electrode pairs and a second dielectric layer covering the address electrodes. In the plasma display panel having a lower plate and an upper plate disposed to face each other, The upper plate includes a front substrate, sustain electrode pairs disposed on the front substrate, and a first dielectric layer covering the sustain electrode pairs. The lower plate may include a rear substrate disposed to face the front substrate, an address electrode disposed on the rear substrate, intersecting the sustain electrode pairs, a second dielectric layer covering the address electrodes, the front substrate and the substrate. And a partition wall formed of plastic, and a phosphor layer disposed on the discharge cells, dividing a space between the rear substrates into a plurality of discharge cells. The method of claim 4, wherein The barrier rib is formed by including at least one selected from the group consisting of polymethyl methacrylate, polycarbonate, polyimide, glass epoxy, polytetrafluoroethylene. In the plasma display panel having a lower plate and an upper plate disposed to face each other, The lower plate includes a rear substrate, sustain electrode pairs disposed on the rear substrate, and a first dielectric layer covering the sustain electrode pairs. The top plate may include a front substrate disposed to face the rear substrate, an address electrode disposed on the front substrate and crossing the sustain electrode pairs, a second dielectric layer covering the address electrodes, the front substrate and the substrate. And a partition wall formed of plastic and a phosphor layer disposed in the discharge cells, the space between the rear substrate being divided into a plurality of discharge cells. The method of claim 6, The barrier rib is formed by including at least one selected from the group consisting of polymethyl methacrylate, polycarbonate, polyimide, glass epoxy, polytetrafluoroethylene.

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