KR20000008921U - Phosphor paste spraying device - Google Patents

Abstract

The present invention relates to an apparatus for manufacturing a plasma display panel, and more particularly, to a phosphor paste spraying apparatus for injecting a phosphor paste into a space between partition walls. The phosphor paste spraying apparatus of the present invention comprises a paste supply port into which the phosphor paste is introduced, an air inlet port into which air is introduced, a back pressure regulator for controlling the constant air pressure and preventing the flow of the paste by residual air pressure, and a phosphor paste A nozzle head provided with a nozzle for raising; And cameras respectively provided at both sides of the nozzle head in order to accurately align the nozzle head in a desired position.

Description

Phosphor paste spraying device

The present invention relates to an apparatus for manufacturing a plasma display panel, and more particularly, to a phosphor paste spraying apparatus for injecting a phosphor paste into a space between partition walls.

Plasma Display Panel (PDP) is a display device that uses gas discharge phenomenon for image display, and because the overall thickness can be made less than 10cm, the thickness and weight are remarkable compared to the CRT display device using an electron gun. In addition, the present invention is emerging as a next-generation display device because of its advantage of reducing the narrowness of the viewing angle, which is a weak point of the liquid crystal display device.

This PDP is shown in FIG. 1, which will be described below. 1 is a diagram showing a unit discharge cell of an AC PDP.

As shown, the AC PDP is formed by bonding the back substrate 1 on which the address electrode 2 is formed and the front substrate 11 on which the discharge electrode 12 is formed to face the electrode arrangement surface, and the substrates 1 and 11. Is filled with a discharge gas, for example, a mixed gas (not shown) of neon (Ne) and xenon (Xe).

Here, the discharge electrode 12 formed on the front substrate 11 is composed of a transparent electrode 12a and a bus electrode 12b, and the front substrate 11 covers the discharge electrode 12 described above. Dielectric layer 14 is applied, and a protective film 16 made of a material such as MgO is applied on top thereof.

On the other hand, a second dielectric layer 4 having a predetermined thickness is coated on the rear substrate 1 to cover the address electrodes 2, and the independent dielectric discharge space is defined on the first dielectric layer 4 and adjacent discharges are formed. Barrier ribs 6 are formed to prevent crosstalk between the spaces, and phosphors 8 are coated between the partitions 6.

In the AC PDP having the above structure, ultraviolet rays generated by plasma emit light of the phosphor 5, thereby displaying a predetermined color.

However, the AC PDP having the above structure is formed by screen printing during the manufacturing process of most of the components. Particularly, in the case of the partition wall, at least 10 repetitive printing processes are performed due to its height. Due to the misalignment caused by the repetitive printing process, the position may be changed, and this is possible in all discharge spaces in which phosphors of the same color are applied during phosphor coating applied after the screen printing method. As a result of which the phosphor coating amount of is not uniform, as a result, uniform luminance cannot be obtained.

In addition, even when the phosphor is printed, the screen gap is widened due to deformation of the screen mask, for example, an external force, thereby preventing the phosphor from being applied at a desired position, and in particular, the phosphor is applied onto the partition wall, thereby degrading display characteristics. It may also result in.

On the other hand, in order to solve the above problems, conventional methods using a fluorescent film or a photosensitive paste have been attempted, but these methods are recovered due to the high cost of the material itself and a large amount of waste in the process. This is difficult, and in particular, because a separate purchase of equipment is required, as a result there was another problem that the manufacturing cost is increased.

Therefore, the present invention devised to solve the above problems, by simultaneously spraying the phosphor paste with a constant air pressure in each of the spaces to be applied the same color phosphor paste, injecting the phosphor accurately and uniformly in all spaces It is an object of the present invention to provide a phosphor paste spraying device that can be made.

1 is a cross-sectional view showing an AC plasma display panel.

2 is a view showing a phosphor paste spraying apparatus according to an embodiment of the present invention.

3 is a view for explaining an application example of the phosphor paste injection device of the present invention.

(Explanation of symbols for the main parts of the drawing)

21: paste supply port 22: air inlet

23: back pressure regulator 24: nozzle

30: nozzle head 40: CCD camera

50 phosphor paste 60 substrate

62: bulkhead

The phosphor paste spraying apparatus of the present invention for achieving the above object, the paste supply port for the phosphor paste is introduced, the air inlet port for the air is introduced, the back pressure for controlling the constant air pressure and the flow of the paste by the residual air pressure A nozzle head having a regulator, and a nozzle for injecting the phosphor paste; And cameras respectively provided at both sides of the nozzle head in order to accurately align the nozzle head in a desired position.

According to the present invention, a phosphor coating device is disposed on a back substrate on which a partition wall is formed, and in this state, the phosphor paste is sprayed with constant air pressure simultaneously in discharge spaces to which phosphors of the same color are applied, thereby causing phosphors in the discharge spaces. The application of can be made uniform.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a view schematically showing a phosphor paste spraying apparatus according to an embodiment of the present invention, as shown, the phosphor paste spraying apparatus of the present invention is a paste supply port 21 through which the phosphor paste is introduced, and air Nozzle head provided with an air inlet port 22 introduced therein, a back pressure regulator 23 for controlling the constant air pressure and preventing the flow of the paste due to residual air pressure, and a nozzle 24 for injecting the phosphor paste 30, and a CCD camera (Charge Coupled Device) 40 provided on both sides of the nozzle head 30 so that the nozzle head 30 is correctly aligned at a desired position.

In the above, the paste supply port 21 is provided to supply a predetermined amount of phosphor paste to the nozzle head 30 at a predetermined time, and is disposed at the upper center portion of the nozzle head 30.

The air inlet 22 is provided to create a constant air pressure in the nozzle head 30 into which the phosphor paste is introduced, and is disposed at each upper edge portion of the nozzle head 30.

The back pressure regulator 23 is provided to maintain a constant air pressure in the nozzle head 30 and to prevent the flow of the phosphor paste due to residual air pressure after the injection of the phosphor paste 50. It is arrange | positioned at the upper center part of the nozzle head 30 adjacent to 21. As shown in FIG.

The nozzle 24 is provided to inject the phosphor paste into the space between adjacent partitions, and is provided below the nozzle head 30. As illustrated, approximately 3 to 4 nozzles 24 are provided. do.

At this time, the interval between the adjacent nozzles 24 is the interval between the spaces to be applied phosphor paste of the same color, the opening width of the nozzle 24 between the adjacent partitions in consideration of the process margin for deformation of the partition wall. The range of not more than 2/3 of the space of the unit cell, that is, the width of the unit cell, preferably about 1/3 to 2/3.

In addition, a holder 25 surrounding the nozzle 24 is provided on the outside of each nozzle 24 so that the phosphor paste can be injected at a position similar to the height of the partition wall.

On the other hand, when the phosphor paste is injected into the space between the partition walls using the phosphor paste injection device of the present invention as described above, as shown in Figure 3, the partition walls 62 using the CCD camera 40 A holder surrounding the nozzle 24 so that the nozzle head 30 can be accurately aligned with the upper portion of the substrate 60 formed thereon, and the phosphor paste 50 can be sprayed at a position equal to the partition height. The phosphor paste 50 is implanted in a state in which 25 is arranged so as to be in close contact with the upper surface of the partition wall 62.

In addition, in the case of using the phosphor paste spraying apparatus of the present invention, the phosphor paste 50 is injected into all the spaces provided on the substrate 60 by a scanning method, and in addition, the phosphor paste injection process is performed three times. Phosphor pastes of green, blue, and blue are sequentially injected into the spaces between the partition walls 62.

Therefore, when the phosphor paste is sprayed into the spaces between adjacent partitions using the phosphor paste spraying apparatus of the present invention, the amount of the phosphor paste sprayed simultaneously through the nozzles becomes uniform in all the spaces. The phosphor paste is prevented from being sprayed on the partition walls.

In addition, since the opening width of the nozzle is not set to exceed 2/3 of the width of the unit cell, even if the partition wall is deformed, the phosphor paste can be easily injected only into the unit cell.

As described above, since the present invention simultaneously injects the phosphor paste through the nozzle at a constant air pressure into each of the spaces between the partitions to which the phosphor paste of the same color is to be applied, the injection amount of the phosphor paste is uniform in all the spaces. As a result, the luminance of all the discharge cells can be made uniform, so that the characteristics of the display screen can be improved.

In addition, since the phosphor paste can be injected while checking the position of the partition wall using a CCD camera, the phosphor paste is injected only into the spaces between the partition walls without spraying the phosphor paste on the partition wall, thereby improving yield and of course a relatively simple process. It can be expected to reduce the manufacturing cost by performing.

Meanwhile, although specific embodiments of the present invention have been described and illustrated, modifications and variations can be made by those skilled in the art. Therefore, hereinafter, the scope of the utility model registration request can be understood to include all modifications and variations as long as they fall within the true spirit and scope of the present invention.

Claims (6)

The nozzle head is provided with a paste supply port through which the phosphor paste is introduced, an air inlet port through which air is introduced, a back pressure control port for controlling a constant air pressure and preventing the flow of the paste by residual air pressure, and a nozzle for injecting the phosphor paste. ; And cameras provided on both sides of the nozzle head to align the nozzle head precisely at a desired position. The method of claim 1, wherein the paste supply port and the back pressure regulator is disposed in the upper central portion of the nozzle head, respectively, the air inlet is disposed in the upper edge portion of the nozzle head, respectively, the nozzle is disposed below the nozzle head Phosphor paste spraying apparatus, characterized in that. The phosphor paste spraying apparatus according to claim 1 or 2, wherein three to four nozzles are provided under the nozzle head. The apparatus of claim 3, wherein the nozzles are spaced at regular intervals between spaces in which phosphor pastes of the same color are to be injected. 4. The phosphor paste ejection apparatus according to claim 3, wherein the nozzle is wrapped by a holder. The apparatus of claim 3, wherein a width of the nozzle is about 1/3 to 2/3 of a width of a unit cell.