KR20020066612A - A Screen Mask For Manufacturing The Screen - Google Patents

Abstract

PURPOSE: A screen mask for manufacturing improved phosphor screen is provided to achieve an improved yield rate, lengthen lifespan of screen mask and enhance quality of the phosphor screen. CONSTITUTION: A screen mask comprises a frame for fixing a mesh(2), wherein the frame is formed into a double structure including a first frame(1) and a second frame(1-2). One of the first frame or the second frame has the mesh attached to the frame, and is movable so as to adjust size of the mesh. The other of the first frame or the second frame supports the frame where the mesh is attached. One of the first frame or the second frame is an integrated type and the other is a split type. The split type frame has a plurality of connection rings(4) and is fixed to the integrate type frame. The size of the mesh and the size of an effective screen(3) are adjusted by controlling the split type frame through the connecting rings.

Description

A screen mask for manufacturing the screen

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen mask for manufacturing a fluorescent screen of a display device. In particular, the screen mask may be manufactured in a dual structure to adjust the effective surface of the screen mask after manufacture or during use, thereby improving the life of the screen mask and improving the quality of the fluorescent screen. The present invention relates to a screen mask for producing a fluorescent surface for improvement.

The fluorescent surface of the display element is present between the black matrix, and the method of manufacturing the black matrix and the fluorescent surface includes an exposure method and a printing method using a screen mask.

The exposure method first applies a material to be formed on the inner surface of the panel, that is, a black matrix or phosphor on the front surface by spin, and then selectively transmits light only to a specific part of the front surface using a photomask on which a desired pattern is formed, and then cures it. It is a method of obtaining a desired pattern by removing a portion other than the selected portion with a specific developer or water by applying a constant pressure. The method is mainly used to form a fine pattern because of the large number of processes and a large portion to be managed. It is widely used for the pattern of the curved surface mainly or high definition, and the general cathode ray tube manufactures the fluorescent surface by the above method.

In addition, the method using the screen mask is a method using a screen mask 9 in which an effective surface is formed by using a specific oil agent 15 on the mesh. As shown in FIGS. 1 and 2, first, the panel 8 is placed, and the screen mask 9 is placed on the panel at a predetermined interval, that is, the phosphor paste 11 is formed on the inner surface of the panel. Apply to the top surface of the mask 9, then apply the paste 11 evenly using the scraper in the effective surface of the screen mask 9 and apply a certain pressure to the squeegee 16, the viscosity of the paste 11 is increased. By passing through the pattern of the mesh 2 and the emulsion 15 formed in the lower mesh. Then, when the pressure of the squeegee 16 is released, the viscosity of the paste 11 decreases and the elasticity increases, so that the paste 11 exists in a predetermined pattern only on a desired portion on the inner surface of the panel 8. The method is mainly used for the manufacture of fluorescent screens for all-flat display devices such as PDP, FED, CFP, Flat CRTs.

In the structure of a conventional screen mask, as shown in FIG. 3, a mesh 2 made of polyester or metal is fixed to a frame 1 made of metal such as aluminum (Al) or iron (Fe), and the mesh ( On the upper surface of 2) there is an effective surface formed of the oil agent 15. The effective surface is formed at a part of the center of the mesh 2, and is generally formed in a range of about 1/9 of the overall size.

The screen mask 9 is first manufactured by attaching a screen mask to the frame 1 and aging for about 1 to 2 days and then applying an emulsion, exposing, developing and washing. The screen mask 9 manufactured by the above method is used to manufacture a fluorescent surface of the panel 8 by being coupled to a printer. When the screen mask 9 is coupled to the printer, the frame is not fixed to the entire screen mask, but rather a portion (4 to 6 points). ) Only.

Since the screen mask determines the position of the fluorescent screen and the width of the line or slot, the screen mask is an important factor in determining the quality of the screen in the display device for manufacturing the fluorescent screen using the screen mask. Therefore, if the screen mask is not accurate, the desired screen cannot be realized.

However, since the screen mask is formed by attaching a mesh to the metal frame, the screen mask is severely changed for various environmental conditions. In particular, the mesh and the frame are easily deformed due to temperature and humidity, and when the screen mask is mounted, the screen mask is easily deformed with respect to the uniformity of external pressure, and the dimensions of the effective surface formed on the screen mask are changed. The desired dimensions cannot be obtained. In addition, if the stress caused by the squeegee pressure continues more than a certain number of times, the screen mask is severely deformed and it is difficult to lose the stress or maintain the original dimensions. Therefore, the screen manufactured by the above method has a problem of a price burden and a decrease in production since the quality change due to the screen mask is large and the life is limited, so the use yield is low and should be replaced frequently.

Therefore, the present invention is to produce a frame of the screen mask in order to improve the above problems by adjusting the effective surface of the screen mask after fabrication or during use, thereby improving the yield and life of the screen mask and the fluorescent surface for improving the quality of the fluorescent surface It relates to a screen mask for manufacturing.

1 is a view showing a fluorescent screen manufacturing process using a general screen mask,

2 a to b are views showing a fluorescent screen manufacturing process using a screen mask,

3 is a view showing a conventional screen mask shape;

4 is a view showing a screen mask shape of the present invention;

5 is a view illustrating a structure of the second frame of FIG. 4 viewed from the bottom;

6 illustrates another example of the present invention;

7 is a partial cross-sectional view of FIG. 6, and

8 is a view showing another embodiment of the present invention.

*** Explanation of symbols for the main parts of the drawing ***

1: first frame 1-2: second frame 2: mesh

3: effective side 4: connecting ring 6: fastener

Technical means of the present invention for achieving the above object is a screen mask for manufacturing a fluorescent screen comprising a frame for fixing a mesh, the frame is formed of a dual structure of the first frame and the second frame, the first, second One of the two frames is attached to the mesh is movable to adjust the size of the mesh, the other frame is characterized in that the fixed support for the frame to which the mesh is attached.

One of the first and second frames is integral, and the other is separated.

The detachable frame is fixed to the unitary frame with a plurality of connecting rings, characterized in that the size of the mesh and the effective surface is changed by adjusting the detachable frame through the ring.

The detachable frame is characterized in that adjacent frames are connected with fasteners.

In addition, a groove is formed in the unitary frame, and the detachable frame is inserted into the groove to be fixed to the unitary frame by a connecting ring, and the size of the mesh and the effective surface can be adjusted by the connecting ring. do.

An embodiment of the screen mask structure of the present invention will be described in detail with reference to FIG. 4. First, a plurality of second frames 1-2 are fixed to each side of the first frame 1 to produce a double frame. At this time, the first frame 1 and the second frame 1-2 are firmly fixed using three or more fixing devices 4 on each side. In addition, as shown in FIG. 5, the second frames 1-2 are fixed to adjacent frames by using fasteners 6, wherein the bolt grooves formed in the second frames 1-2 are used bolts. It is made larger enough to facilitate future resizing. The mesh 2 is attached to the frame formed as described above with an adhesive, but not attached to the first frame 1, but only to the second frame 1-2. After attaching the mesh to the frame, the screen mask is left for one day or more, but sufficient aging is required to prevent the mask change due to squeegee pressure. After a certain period of time left unattended, the screen mask is subjected to emulsion coating, exposure, and development similarly to the existing screen mask. The manufactured screen mask measures the effective surface of the mask through a precision measuring instrument.

In this case, when the effective surface is not formed in the desired size, the fixed frame 4 is used to change the second frame 2 to form a predetermined dimension. During the adjustment of the second frame, the bolts of the fasteners 6 are loosened to prevent deformation of the frame and the bolts of the fasteners 6 are firmly tightened after being adjusted. These adjustments can be made equally during use. In addition, in the process of designing the mask, it is desirable to reduce the size of the mask to a desired size so that the mask extends in the adjustment direction.

According to another embodiment of the present invention, as shown in FIGS. 6 and 7, the second frame 1-2 is connected to the groove of the first frame 1, but not fixed at a predetermined position. It is configured to be adjustable by the device 4. The manufacturing process is performed in the same manner as in the above embodiment except for the combination of the first frame 1 and the second frame 1-2, and the adjustment of the effective surface size may be performed in the same manner. Compared to the above embodiment, the present embodiment can reduce the size of the first frame and the size of the entire mask, which is excellent in cost reduction, transportation, and ease of use, and can be more structurally combined.

8 illustrates another embodiment of FIG. 4. As shown in the drawing, the second frame (1-2) is fixed to the outside of the first frame by using the fixing device (4), and the mesh is attached to only the second frame (1-2) to enable post-production adjustment. . Also in this case, the manufacturing process is the same as in the above two embodiments except for the combination of the first frame 1 and the second frame 1-2, and the adjustment of the effective surface size may be performed in the same manner.

Since the screen mask of the present invention configured as described above can be dimensioned after fabrication, the production yield is improved, and the screen mask life can be improved since it can be used when the screen mask is deformed due to temperature, environment, and external impact during use. In addition, the quality of the fluorescent screen printed on the screen is improved.

Claims (6)

In the screen mask for manufacturing a fluorescent screen comprising a frame for fixing the mesh, The frame is formed of a dual structure of a first frame and a second frame; One of the first and second frames is attached to the mesh is movable to adjust the size of the mesh, the other frame is a screen for manufacturing a fluorescent screen characterized in that the fixed support for the frame to which the mesh is attached. The method of claim 1, One of the first and second frames is a one-piece, the other is a screen for manufacturing a fluorescent screen characterized in that the separation. The method of claim 2, The detachable frame is fixed to the unitary frame with a plurality of linkages; Screen mask for manufacturing a fluorescent surface, characterized in that the size of the mesh and the effective surface is changed by adjusting the detachable frame through the ring. The method of claim 2, The detachable frame is fluorescent screen manufacturing screen mask, characterized in that adjacent frames are connected with fasteners. The method of claim 2, Grooves are formed in the unitary frame; The detachable frame is inserted into the groove and fixed to the unitary frame by a connecting ring; Screen mask for producing a fluorescent surface, characterized in that to enable the size of the mesh and the effective surface by the connecting ring. A flat panel display device comprising a fluorescent surface produced through the screen mask according to any one of claims 1 to 5.