KR100684824B1 - Plasma display panel - Google Patents

Abstract

The present invention relates to a high-brightness, high-efficiency plasma display panel having a partition structure capable of coping with a high-definition shape, comprising: a pair of front substrates and rear substrates having at least a front side transparent to form a discharge space; Barrier ribs disposed on a rear substrate to partition the discharge space into a plurality of spaces; And an electrode group provided on the substrate to generate a discharge in the discharge space partitioned by the partition wall, wherein the partition wall includes a phosphor and the partition wall and the phosphor layer are integrally formed.

Plasma display panel, green phosphor, discharge stability, service life

Description

Plasma Display Panel {PLASMA DISPLAY PANEL}

1 is a perspective view showing the structure of a conventional plasma display panel.

[Industrial use]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel (PDP), and more particularly, to a high brightness and high efficiency plasma display panel having a partition structure that can cope with a high definition shape.

[Private Technology]

The plasma display panel is a display device using a plasma phenomenon, and discharge occurs when at least one potential difference is applied between two spatially separated contacts in a gas atmosphere in a non-vacuum state, which is called a gas discharge phenomenon.

A plasma display element is a flat panel display element which applied such gas discharge phenomenon to image display. A plasma display panel generally used at present is a reflective AC drive plasma display panel, and in the case of a bottom plate structure, a phosphor layer is formed on a partition wall.

1 is a perspective view of the plasma display panel 1. As shown in FIG. 1, between the two substrates constituting the upper substrate 3 and the lower substrate 5, a plurality of partitions 7 forming discharge cells are arranged at regular intervals. Green and blue phosphor layers 9 are formed. Address electrodes 11 to which address signals are applied are formed on the rear substrate 5, respectively. The front substrate 3 has a large number of X electrodes 13 and Y electrodes 15 forming a pair of sustain electrodes for one discharge cell at random intervals in a direction crossing the address electrode 11. Is formed. The discharge space is filled with a discharge gas such as Ne-Xe or He-Xe. That is, two electrodes are provided in the discharge space of the plasma display panel, and phosphors 9 of red, green, and blue are arranged in a regular pattern. When a predetermined voltage is applied between the electrodes, plasma discharge occurs. The phosphor layer is excited by ultraviolet rays generated during plasma discharge, and the excited phosphor emits light.

Such PDPs are expected to be the next generation display device runners because they can be made thin and large. Since the luminous efficiency changes according to the precision of the partition wall forming each cell of the PDP and the resolution depends on the partition pitch, the partition wall must be manufactured precisely.

As a method of manufacturing the partition wall of the PDP, a screen print method, a sand blast method, a lift-off method, a photolithography method, a blade method, a molding ), Etching, and the like.

The screen printing method is a method of printing a desired shape on a substrate by placing a patterned screen on a substrate at regular intervals, pressing a paste necessary for forming a partition, and printing the paste on the rear substrate while the back substrate is fixed. The drying process is repeated to form a partition on the rear substrate. However, the screen printing method repeats the process of properly adjusting the position of the screen and the substrate every time the paste printing process is repeated, which not only makes the process complicated and time-consuming, but also displaces the position and decreases the resolution during the repeated work. There are disadvantages.

The sand blast method is a method of forming a partition by spraying and removing an abrasive such as Al ₂ O ₃ , SiO _2, or the like with compressed air or the like on a rear substrate. The partition material is coated on the rear substrate, and the photosensitive material is exposed on the applied partition material. The film is coated, the mask is fixed on the photosensitive film, and then exposure and development operations are performed to form a partition wall, at which time a material for partition protection is left on the partitioned wall. The abrasive is then sprayed to physically remove the unprotected portion of the photosensitive film and roll off the remaining protective film to complete the partition. However, the sand blasting method has a disadvantage in that the cost of equipment investment such as abrasive grinding equipment is increased and the crack of the substrate is generated as the physical impact is applied to the glass substrate.

The lift-off method forms a partition wall pattern, and then fills the glass paste, calcinates at a high temperature, leaves a glass material and removes the pattern to form a partition wall. The photoresist film is applied on the back substrate and the mask is mounted on the photosensitive material. It is then exposed. Next, as the exposed portions are developed, the photosensitive material is sintered to form partition walls. However, the lift-off method has a disadvantage in that the formed pattern is torn down or a partition crack may be generated during firing, and the photosensitive film remains after firing.

The photolithography method is a method of manufacturing a partition wall by coating a photosensitive partition material on a rear substrate, and then exposing and baking the photosensitive material on a rear substrate, mounting a mask on the photosensitive material, and then exposing the partition wall. Next, as the exposed portions are developed and baked, the photosensitive material is sintered to form partition walls. However, in the photolithography method, it is difficult to form 200 μm or more of the thickness of the barrier rib only by ultraviolet exposure, and the photosensitive material used is unstable and expensive.

The present invention is to solve the above-described problems, an object of the present invention is to form a plasma layer having a partition structure that can correspond to the high-definition shape used in the HD (high definition) class by forming the phosphor layer and the partition wall of the lower substrate integrally It is for providing a display panel.

Another object of the present invention is to provide a method of manufacturing a plasma display panel having the barrier rib structure.

In order to achieve the above object, the present invention is a pair of front substrate and rear substrate at least the front side is transparent to form a discharge space; Barrier ribs disposed on a rear substrate to partition the discharge space into a plurality of spaces; And an electrode group provided on the substrate to generate a discharge in the discharge space partitioned by the partition wall, wherein the partition wall includes a phosphor and the partition wall and the phosphor layer are integrally formed.

The present invention also provides a method for preparing a paste including ceramic powder or glass particles and a phosphor; Applying the paste to a back substrate having a dielectric layer formed thereon; And pressing and drying the mold having a shape opposite to the partition wall shape on the coated paste, followed by drying and baking.

Hereinafter, the present invention will be described in more detail.

In the present invention, the partition wall separating the discharge space of the plasma display panel is integrally formed with the phosphor layer, so that 147 nm and 173 nm vacuum ultraviolet rays (VUV) emitted from the Xe excitation species in the discharge gas collide with the phosphor to have high brightness and high efficiency. Provided is a plasma display panel. That is, in the present invention, the phosphor is contained in the partition wall, thereby increasing the amount of phosphor per unit area, thereby increasing the luminous efficiency.

The partition wall of the plasma display panel of the present invention also serves as a phosphor layer including ceramic powder, glass particles, and phosphors, which are existing partition wall materials. The phosphor is preferably contained in an amount of 20 to 70% by weight, and more preferably in an amount of 30 to 50% by weight based on the total amount of the partition wall. If the amount of the phosphor is less than 30% by weight, there is a problem of efficiency deterioration due to low luminance, and when the amount of the phosphor exceeds 70% by weight, there is a problem that the strength of the partition is lowered. The ceramic powder or glass particles are well known as a barrier material, and specific examples thereof include PbO, SiO ₂ , B ₂ O ₃ , Al ₂ O ₃ , Ti0 ₂ , CaO, ZnO, and the like. Of course, all of the phosphors used in the PDP can be used as the phosphor.

In a preferred embodiment of the present invention, the partition wall is formed by further increasing the amount of phosphor in the portion exposed to the discharge space in the partition wall, and the partition wall may be formed by reducing the amount of the phosphor in the partition wall not exposed to the discharge space. For example, the content of the phosphor is adjusted to 70 to 100% by weight, preferably 90 to 100% by weight, and the content of the phosphor is 0 to 40% by weight in the partition portion exposed to the discharge space. May be adjusted to 10 to 20% by weight. The space exposed to the discharge space may be, for example, the thickness of the partition wall to 1/2 to 1/3 of the thickness of the partition wall in the discharge space to which the phosphor is applied.

In the present invention, by using a mold to form a partition wall having the same thickness as the upper and lower partitions can correspond to the high-definition shape used in HD class. As the bulkhead structure becomes more complex, the corresponding line width in the process is limited, which makes it difficult to achieve high definition. However, the molding process can be reduced by using a molding method in which the phosphor is imprinted at one time.

The barrier rib structure in which the barrier rib and the phosphor layer are integrally manufactured may include a paste including ceramic powder, glass particles, and a phosphor, and apply the paste to a back substrate having a dielectric layer formed thereon, and having a shape opposite to the barrier rib shape on the applied paste. The eggplant is produced through a process of pressing and pressing the mold to dry and fire.

The paste is prepared by dispersing ceramic powder or glass particles and phosphor in a vehicle in which a binder resin is dissolved in a solvent. Examples of the binder resin and the solvent used for preparing the paste are as described below, but are not limited thereto.

As the binder resin, a cellulose resin, an acrylic resin, or a mixture thereof may be used. As the cellulose resin, for example, methyl cellulose, ethyl cellulose, propyl cellulose, hydroxy methyl cellulose, hydroxy ethyl cellulose, hydroxy propyl cellulose, hydroxy ethyl propyl cellulose, or a mixture thereof may be used. As said acrylic resin, For example, poly methyl methacrylate, poly isopropyl methacrylate, poly isobutyl methacrylate, or methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, Hexyl methacrylate, 2-ethyl hexyl methacrylate, benzyl methacrylate, dimethyl amino ethyl methacrylate, hydroxy ethyl methacrylate, hydroxy propyl methacrylate, hydroxy butyl methacrylate, phenoxy 2- Hydroxy propyl methacrylate, glycidyl methacrylate, methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, hexyl acrylate, 2-ethyl hexyl acrylate, benzyl acrylate, dimethyl amino ethyl acrylate , With hydroxy Acrylate, hydroxypropyl acrylate, hydroxybutyl acrylate, phenoxy copolymer, or a mixture of acrylic monomers such as 2-hydroxypropyl acrylate, glycidyl acrylate can be used. In some cases, the paste may comprise a small amount of inorganic binder. Preferably, the content of the binder resin may be about 2 to about 8% by weight based on the paste.

Alcohol, ether, ester, or a mixture thereof may be used as the solvent, and more preferably butyl carbitol (BC), butyl carbitol acetate (BCA), terpineol (terpineol) or mixtures thereof and the like can be used. If the content of the solvent is too high or too low, the flow characteristics of the composition is not appropriate, the process of forming a green phosphor layer may not be easy. In consideration of this point, the content of the solvent may be about 40 to about 80 wt% based on the paste.

The paste may further include other additives to improve flow characteristics, process characteristics, and the like. As the additive, for example, various additives such as a photosensitizer, a dispersant, a silicone-based antifoaming agent, a leveling agent, a plasticizer, an antioxidant, etc. may be used alone or in combination, all of which are commonly used in the art. Available to those with knowledge of

The paste is applied to the back substrate on which the dielectric layer is formed, and a mold having a shape opposite to the partition wall shape is pressed on the applied paste. As the mold, a metal mold, a plastic mold, or the like may be used, and the mold may have a certain strength, and the material is not particularly limited. The partition wall manufactured in a certain form is dried and fired. The drying step is preferably carried out by hot air drying at 150 to 250 ℃, the firing step is preferably carried out at a temperature of 400 to 600 ℃.

Hereinafter, preferred embodiments of the present invention are described. However, the following examples are only preferred embodiments of the present invention, and the present invention is not limited to the following examples.

Example 1

Ethyl cellulose is mixed with a binder in a weight ratio of 3: 7 mixed solvent of butylcarbitol acetate and terpineol, and then a bulk material mixture and a phosphor in which PbO, SiO ₂ and B ₂ O ₃ are mixed in a weight ratio of 1: 1: 1. The paste was prepared by adding 1: 1. The content of the mixture of the partition material and the phosphor in the paste was 50% by weight. The paste was prepared separately using red, green, and blue phosphors, respectively. (Y, Gd) BO ₃ : Eu was used as a red phosphor, Zn ₂ SiO ₄ : Mn was used as a green phosphor, and BaMgAl ₁₀ O ₁₇ : Eu was used as a blue phosphor.

The paste was applied to the back substrate having the dielectric layer formed thereon, the mold was pressed, and then hot-air dried at 150 ° C., and then calcined at 500 ° C. to manufacture partition walls containing phosphors, thereby manufacturing a plasma display panel.

Comparative Example 1

Ethyl cellulose was mixed with a binder in a weight ratio of 3: 7 mixed solvent of butylcarbitol acetate and terpineol, and then 50 parts of a bulk material mixture containing PbO, SiO ₂ , and B ₂ O ₃ in a weight ratio of 1: 1: 1. The bulkhead paste composition was prepared by adding%. The barrier paste composition was screen printed on a back substrate on which a dielectric was formed, followed by drying to form barrier ribs, and red, green, and blue phosphor pastes were applied to discharge cells formed between the barrier ribs to form a phosphor layer, thereby manufacturing a plasma display panel. (Y, Gd) BO ₃ : Eu was used as a red phosphor, Zn ₂ SiO ₄ : Mn was used as a green phosphor, and BaMgAl ₁₀ O ₁₇ : Eu was used as a blue phosphor.

Plasma display panel of the present invention can improve the productivity by reducing the unit process compared to the process of separating the partition wall and the phosphor layer by forming the partition wall and the phosphor integrally, the discharge failure generated in the partition wall formation by increasing the uniformity of the partition wall Can be reduced. In addition, it is possible to reduce the interval between the cell pitch can be applied to the HD plasma display panel of a high-definition shape, that is, the distance between the partition walls and the height of the partition walls are high.

Claims (4)

At least one pair of front and rear substrates having a transparent front side to form a discharge space; Barrier ribs disposed on a rear substrate to partition the discharge space into a plurality of spaces; And An electrode group provided on the substrate to generate a discharge in the discharge space partitioned by the partition wall; The partition wall is formed of an integrally formed partition and the phosphor layer, including a phosphor, the partition portion exposed to the discharge space contains 70 to 90% by weight of the phosphor, the interior partition portion of the phosphor of 10 to 40% by weight Plasma display panel that comprises. The plasma display panel of claim 1, wherein the phosphor is contained in an amount of 20 to 70 wt% based on the total amount of the partition wall. delete delete

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