KR20030041061A - Method of Fabricating the Barrier Rib on Plasma Display Panel - Google Patents

Abstract

PURPOSE: A method for manufacturing barrier ribs is provided to reduce manufacturing procedures and prevent generation of impurity gas, while suppressing emission of noxious gas. CONSTITUTION: A method comprises a first step of forming an address electrode and a dielectric layer(32) on a substrate(30); a second step of forming a paste(34) for barrier ribs on the substrate; a third step of forming a water soluble photosensitive vehicle(36) on the paste; a fourth step of exposing the water soluble photosensitive vehicle; a fifth step of developing the water soluble photosensitive vehicle by using a developing agent of pure aqueous solution; a sixth step of forming barrier ribs from the paste corresponding to the exposed portion of the developed water soluble photosensitive vehicle by using a sand blasting method; and a seventh step of baking the barrier ribs.

Description

Method of fabricating the barrier rib of plasma display panel {Method of Fabricating the Barrier Rib on Plasma Display Panel}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a plasma display panel, and more particularly, to a method for manufacturing partition walls of a plasma display panel, which can simplify a process and prevent generation of impurities.

Plasma Display Panels (hereinafter referred to as "PDPs") display an image including characters or graphics by emitting phosphors by ultraviolet rays of 147 nm generated upon discharge of He + Xe or Ne + Xe gas. Such a PDP is not only thin and easy to enlarge, but also greatly improved in quality due to recent technology development.

Referring to FIG. 1, there is shown an AC drive type PDP having a lower substrate 14 on which an address electrode 2 is mounted and an upper glass substrate 16 on which a pair of sustain electrodes 4 are mounted. On the lower substrate 14 on which the address electrode 2 is mounted, a partition 8 for dividing the dielectric 18 and the discharge cells is formed. Phosphor 6 is coated on the surfaces of the dielectric 18 and the partition 8. The phosphor 6 emits light by ultraviolet rays generated during plasma discharge to generate visible light. The dielectric layer 12 and the passivation layer 10 are sequentially formed on the upper substrate 16 on which the sustain electrode pairs 4 are mounted. The dielectric layer 12 accumulates wall charges during plasma discharge, and the protective layer 10 protects the pair of sustain electrodes 4 and the dielectric layer 12 from sputtering of gas ions during plasma discharge and improves the emission efficiency of secondary electrons. Height plays a role. The discharge cells of the PDP are filled with a mixed gas of He + Xe or Ne + Xe.

The partition 8 serves to prevent electrical and optical crosstalk between discharge cells. Therefore, the partition wall 8 is the most important factor for display quality and luminous efficiency, and as the panel is enlarged and fixed, various studies on the partition wall have been made. As the barrier rib manufacturing method, a screen printing method, an additive method, a photosensitive paste method, a low temperature cofired ceramic on metal (LTCCM) method, a sand blasting method, and the like are applied.

Among them, the screen printing method has a simple process and low manufacturing cost, but there is a problem in that the screen and the lower substrate 14 are aligned, the printing and drying of the glass paste is repeated several times during each printing. In addition, when the position of the screen and the glass substrate is shifted during the printing process, since the partition wall is deformed, both sides of the partition wall 8 are not flat and there is a disadvantage that the shape accuracy is low.

The addition method has an advantage of forming barrier ribs 8 on a large-area substrate, but it is difficult to separate photoresist and glass paste, leaving a residue or collapsing barrier ribs when forming barrier ribs.

The photosensitive paste method is not only difficult to expose the photosensitive paste to the lower portion of the photosensitive paste, but also has a disadvantage that the photosensitive paste is expensive.

While the LTCCM method has a relatively simple manufacturing process and is advantageous in manufacturing a high definition and high aspect ratio partition wall, it is difficult to select a composition of the partition wall material to lower the mold pressure required for partition wall formation. In addition, when the applied mold pressure is biased, the height of the partition wall becomes uneven, and a separate polishing process or the like is required to correct the height of the non-uniform partition wall.

Finally, a method of manufacturing a partition wall using sand blasting will be described step by step with reference to FIGS. 2A to 2G.

First, as shown in FIG. 2A, a dielectric 18 and a partition paste 20 on which the address electrode 2 is mounted are formed on the lower substrate 14.

The dielectric 18 is formed on the lower substrate 14 on which the address electrode 2 is formed, and the partition paste 20 is formed on the dielectric 18. Here, the partition paste 20 is formed by a printing method or a coating method to have a predetermined height.

As shown in FIG. 2B, a dry film resin (“DFR”) 22 is formed on the partition paste 20. A laminating process is performed on the DFR 22 to be bonded to the lower substrate 14. The laminating step is a step of applying a uniform pressure while applying heat to a predetermined temperature, whereby the DFR 22 and the lower substrate 14 are adhered by the laminating step.

Subsequently, the masks for forming the partition walls are aligned on the DFR 22 as shown in FIG. 2C. The masks are provided at regular intervals, and the light blocking portion 24a and the light transmitting portion 24b are alternately formed. The light blocking portion 24a blocks the light irradiated corresponding to the area where the partition wall is to be formed. The light transmitting portion 24b transmits the irradiated light so that the DFR 22 is exposed to the light.

When the DFR 22 is exposed and subjected to a developing process, as shown in FIG. 2D, the DFR 22 of the region not exposed to light remains, and the DFR 22 of the region exposed to the light is developed, thereby causing the DFR (22) is patterned. The etchant used to etch DFR 22 in the developing process is sodium tungsten (Na ₂ W ₃ ).

Subsequently, as shown in FIG. 2E, when the sand particles are sprayed onto the partition paste using the sand blasting apparatus 24, the partition paste of the region where the DFR 22 is not formed is removed.

Subsequently, after removing the DFR 22 as shown in FIGS. 2F and 2G, the partition paste 20 is fired to complete the partition 8. At this time, a basic aqueous solution, for example, Na ₂ CO ₃ or NaOH is used to remove the DFR (22).

When laminating the DFR 22 in such a sand blasting method, bubbles are generated and wrinkles may occur in the DFR 22. As a result, the surface of the DFR 22 becomes rugged so that the shape of the partition wall 8 is not properly formed in the process described later.

Sodium ions of the developer or the stripper used to develop or peel the DFR 22 are mixed in the partition paste. Accordingly, the partition paste and sodium ions react with each other to change thermal properties, thereby generating impure gas and emitting environmentally harmful chemicals. In addition, if the cleaning is not well at the time of development, a problem occurs that the stain caused by the foreign matter remaining in the DFR (22). In addition, the conventional barrier rib forming method has a problem in that the process is complicated and the process time is long and the process time is long.

Accordingly, an object of the present invention is to provide a method for manufacturing a partition wall of a PDP that can simplify the process and prevent the generation of impurity gas by developing with a pure solution.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing a surface discharge type plasma display panel of an AC driving method.

2A to 2G are cross-sectional views illustrating a method of manufacturing the partition wall illustrated in FIG. 1 step by step.

3A to 3F are cross-sectional views illustrating a method of manufacturing partition walls of a plasma display panel according to an exemplary embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

2: address electrode 4: sustain electrode pair

6: phosphor 8: partition wall

10: protective film 12,18: dielectric layer

14,30: lower substrate 16: upper substrate

20,34: bulkhead paste 22: DFR

24,40: sand blasting device 36: water soluble photosensitive vehicle

38: mask

In order to achieve the above object, a method of manufacturing a partition wall of a plasma display panel according to the present invention comprises the steps of forming an address electrode and a dielectric layer on a substrate, forming a partition paste on the substrate, water-soluble on the partition paste Forming a photosensitive vehicle, exposing the water-soluble photosensitive vehicle, developing the water-soluble photosensitive vehicle with a pure aqueous solution, and sand blasting the partition paste for the exposed portion of the developed water-soluble photosensitive vehicle. Forming a partition, and firing the formed partition wall is characterized in that it comprises.

Other objects and features of the present invention in addition to the above objects will be apparent from the description of the embodiments with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 3A to 3F.

3A to 3F illustrate a method of manufacturing a partition wall of a PDP according to an embodiment of the present invention.

The partition wall of the PDP according to the present invention can be developed into a pure solution by using a water-soluble water-soluble photosensitive vehicle.

First, referring to FIG. 3A, the dielectric 32 and the partition paste 34 are formed on the substrate 30.

An address electrode (not shown) is mounted on the substrate 30, and a dielectric material 32 is formed by coating a dielectric material over the entire surface of the substrate 30 including the address electrode. In the dielectric 32, wall charges generated during plasma discharge are accumulated. The partition paste 34 is formed on the dielectric 32 by a printing method or a coating method so that the partition paste 34 has a predetermined height.

Subsequently, as shown in FIG. 3B, a water-soluble photosensitive vehicle 36 is formed on the partition paste 34.

The water-soluble photosensitive vehicle 36 is composed of a binder, a monomer, a photoinitiator, and a solvent. A water-soluble photosensitive vehicle 36 having such a configuration is coated on the partition paste 34. As a binder in the composition included in the water-soluble photosensitive vehicle 36, a hydroxy propyl cellulose (Hydroxy-Prooyl-Cellulose: hereinafter referred to as "HPC") is used. When the HPC-based binder is used, it is developed with a pure aqueous solution such as water (H ₂ O) during the development of the water-soluble photosensitive vehicle 36 which will be described later. Thus, by using the water-soluble photosensitive vehicle 36 which consists of several compositions instead of the conventional DFR, adhesiveness with a partition dry film is increased. As a result, the barrier rib pattern is uniformly formed, and the phenomenon in which the barrier rib is collapsed or the upper portion is crushed by the sand blasting method can be prevented.

Thereafter, the mask 38 for forming the partition wall is aligned on the water-soluble photosensitive vehicle 36 as shown in FIG. 3C. The mask 38 is provided at regular intervals, and the light blocking portion 38a and the light transmitting portion 38b are alternately formed. The light blocking portion 38a blocks light irradiated corresponding to the area where the partition wall is to be formed. The light transmitting portion 38b transmits the irradiated light so that the water-soluble photosensitive vehicle 36 is exposed to the light.

When the water-soluble photosensitive vehicle 36 is selectively exposed and subjected to a developing process, as shown in FIG. 3D, the water-soluble photosensitive vehicle 36 of the region not exposed to light remains, and the water-soluble photosensitive of the region exposed to light is shown. The vehicle 36 is developed so that the water soluble photosensitive vehicle 36 is patterned. The etchant used to develop the water-soluble photosensitive vehicle 36 in the developing process is a pure aqueous solution such as water. This is because the binder contained in the water-soluble photosensitive vehicle 36 described above is HPC-based. Since the water-soluble photosensitive vehicle 36 is developed with a pure aqueous solution such as water, generation of impurity gas can be prevented by preventing the sodium ions of the developer used when developing the conventional DFR 22 from being mixed in the partition paste. have.

Thereafter, as shown in FIG. 3E, when the sand particles are sprayed onto the partition paste 34 using the sand blasting apparatus 40, the partition paste 34 of the region where the water-soluble photosensitive vehicle 36 is not formed is removed. do.

Subsequently, as shown in FIG. 3F, the partition paste 34 including the water-soluble photosensitive vehicle 36 is fired to complete the partition.

As described above, the barrier rib manufacturing method of the PDP according to the present invention is coated with a water-soluble photosensitive vehicle on the barrier paste and patterned by a photolithography method. Here, the water-soluble photosensitive vehicle consists of a monomer, a photoinitiator, a solvent, and an HPC binder. As a result, according to the method for manufacturing a partition wall of the PDP according to the present invention, since the water-soluble photosensitive vehicle can be developed with a pure solution as compared to the conventional partition wall manufacturing method, the firing process can be performed without a peeling process. As a result, the number of processes can be reduced, generation of impure gases can be prevented, and emission of environmentally harmful chemicals can be suppressed.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (4)

Forming an address electrode and a dielectric layer on the substrate; Forming a partition paste on the substrate; Forming a water-soluble photosensitive vehicle on the barrier paste; Exposing the water-soluble photosensitive vehicle; Developing the water-soluble photosensitive vehicle with a developing solution of a pure aqueous solution; Forming a partition wall by sand blasting the partition paste, which corresponds to the exposed portion of the developed water-soluble photosensitive vehicle; And firing the formed partition wall. The method of claim 1, The developer of claim _1, wherein the developer comprises water (H ₂ O). The method of claim 1, The photosensitive vehicle is a barrier rib manufacturing method of the plasma display panel, characterized in that consisting of a binder, a monomer, a photoinitiator and a solvent. The method of claim 3, wherein The binder is a hydroxy propyl cellulose (Hydroxy-Prooyl-Cellulose) -based partition wall manufacturing method of the plasma display panel, characterized in that.