KR960010428B1 - Panel manufacturing method and device of color braun tube - Google Patents

Abstract

In a color Braun tube which is fabricated by combining a panel coated with a fluorescent material with a mask, and exposing the panel and mask, the method includes the step of compensating the temperature by decreasing the temperature difference between the panel and the mask, and the temperature compensating step including panel cooling process. The method provides a color braun tube panel fabricated by photo etching, which prevents troubles in photo exposure due to the difference of temperature between the panel and mask.

Description

Panel manufacturing method and apparatus of color brown tube

1 is a flow chart showing a conventional manufacturing method.

2 is a schematic cross-sectional view showing a problem of the conventional manufacturing method.

3 is a flow chart showing the manufacturing method of the present invention.

Figure 4 (a) (b) is a schematic cross-sectional view showing embodiments of the temperature correction means in the manufacturing method of the present invention.

* Explanation of symbols for main parts of the drawings

P: panel

M: mask-frame assembly

D1, D2: temperature compensating duct

D1: heating duct D2: cooling duct

C1, C2: Transfer Conveyor

The present invention relates to the manufacture of color-brown tubes, and more particularly, to a method of manufacturing the panel and a device suitable for implementing the same.

A color CRT is an image display device which displays R, G, B phosphors separately on a fluorescent surface of a panel, and displays a color image by selectively emitting each phosphor. For this purpose, color selecting means is used for the color tube, and the most widely used color selecting means is a shadow mask. The shadow mask is a porous thin plate formed with a number of slit-type or dot-shaped apertures in a very thin thin plate of 0.1 to 0.13 mm, depending on the type of CRT. Since it is not capable of maintaining its own shape, it is generally combined to be supported by a frame and treated as a mask frame assembly.

On the other hand, since the phosphors of the panel should be formed alternately with a very fine pitch (pitch), the phosphor surface is generally manufactured by a photo etching method. Accordingly, the shadow mask is used not only as the above-described color sorting means but also as an exposure mask during photolithography of each phosphor. In addition, a black matrix mainly composed of graphite or the like is formed between each phosphor stripe or dot to increase the luminance of the phosphor surface. Since the shadow mask is also used as the exposure mask in forming the black matrix, the shadow mask serves as a reference mask for determining the positions and shapes of the black matrix and the respective positions of the R, G, and B phosphors. When paired with this shadow mask, this panel and shadow mask pair should always be treated as a pair from the formation of the phosphor to the post-completion use of the CRT.

FIG. 1 illustrates a part of a method for manufacturing a panel by such a photolithography method. In other words, a black matrix or slurry forming one of the phosphors is injected and dispersed in a panel, coated with a predetermined thickness, dried by a heater, a hot air, and the like, and paired with the panel during this process. The assembly (hereinafter abbreviated as mask) moves along the movement of the panel and remains in standby. When drying of the slurry applied to the panel is completed, the panel and the mask are bonded to each other and installed on the exposure target to be exposed by a predetermined light source. The panel and mask are then separated again so that the panel is developed and dried and the mask is in standby again. This process is repeated for the black matrix and each phosphor to form a fluorescent surface of the panel. (In the case where a separate photosensitive agent is used to form the black matrix, only a photosensitive slurry is applied and exposed, and then a graphite solution is applied before development. The process is more involved.)

As described above, the mask is kept at room temperature while various, processes, especially the drying process of heating the panel, are performed at the panel of the paired panel and the mask, so that a considerable temperature difference occurs between them. This temperature difference will vary depending on the configuration and index time of the device, but for example, the panel is dried and put into the exposure process at a temperature of about 40 to 60 ° C while the mask is kept at room temperature, that is, about 20 ° C. It becomes.

The temperature difference between the panel and the mask causes a very serious problem during exposure, which will be described with reference to FIG. 2.

In FIG. 2, the panel P, to which the mask M is coupled, is installed on the face plate of the exposure table X. The panel P, which is relatively high temperature, is transferred to the mask M by radiation. V) to heat it. However, since the mask M, that is, the mask frame assembly is configured so that the shadow mask S, which is a porous thin plate, is supported by the frame F, which is a relatively thick plate, it is intended to expand by radiant heat of the panel P. The shadow mask S is constrained by the frame F which has not yet received sufficient heat transfer, so that the shadow mask S is forced to out-of-plane deformation convexly upward like a dotted line. This is the same as the doping phenomenon that causes the initial drift of electron beam landing in the finished CRT, which is the dotted line (B ') instead of the solid line (B) where the exposure light emitted from the light source (L) is required. Induced along the path), not only causes poor exposure, but also has a problem of lowering the color purity of the finished color CRT.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a panel of a color brown tube, which can solve the above-mentioned conventional problems and prevent exposure failure due to a temperature difference between the panel and the mask.

Another object of the present invention is to provide an apparatus for manufacturing a panel of color brown tubes suitable for implementing such a method of the present invention.

The method of the present invention for achieving the first object of the present invention is a method for producing a color-brown tube of a photo-etching method of applying and drying a slurry to form a phosphor on the panel, and then combined to expose the mask in the air, before the exposure step And a temperature correction step of reducing or eliminating the temperature difference between the panel and the mask.

A device of the present invention for achieving the second object of the present invention is a transfer line for sequentially applying and drying the slurry to the panel, a transfer line for transferring the mask corresponding to the panel, and the panel and the mask transferred to the two transfer lines In the apparatus for manufacturing a color-brown tube comprising an exposure apparatus for coupling exposure, characterized in that the temperature compensation duct for compensating the temperature difference between the at least one of the transfer line panel and the mask of the two transfer line is provided.

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

In FIG. 3, when the panel is transferred along the transfer line, the mask is transferred along the transfer line at room temperature and waits while the black matrix or phosphor slurry is applied and dried as in the prior art. However, the panel and mask are subjected to a temperature correction step of reducing or eliminating the temperature difference between them in accordance with the features of the present invention immediately before being subjected to exposure. The temperature corrected panel and mask are joined together and separated again after exposure. The panel is then developed and dried to apply the next slurry, and the mask moves back and forth with the movement of the panel.

At least three methods may be used as a means for reducing or eliminating the temperature difference between the panel and the mask in the temperature correction step.

The first method is to wait for a sufficient time for the panel to cool to room temperature, naturally cool it, and then apply it to exposure. This method may be implemented by holding the panel before the mask is combined or by holding the panel on the exposure table for a predetermined time with the combination thereof, which entails some process delay.

The second method is to heat the mask to be similar to the panel temperature while waiting for slurry application and drying of the panel. This method installs a predetermined length of heating duct D1 on the conveying conveyor C1 of the mask M as a temperature compensating duct as shown in FIG. By heating the mask M with the heater H provided in the heating duct D1, the mask M may be heated to be close to a temperature during exposure of the panel. In this case, the mask M needs to stay in the heating duct D1 for a sufficient time so that not only the shadow mask S but also the frame F may be thermally expanded to compensate for the domming.

The third method is a method in which the dried panel is cooled to approach the temperature of the mask, that is, room temperature. In this method, a cooling duct D2 of a predetermined length is installed on the conveying conveyor C2 of the panel P as a temperature correction duct as shown in FIG. 4 (b), and this cooling duct D2 is provided. ) Is equipped with a cooling nozzle (N) for injecting a cool air flow to the panel (P) is implemented in a way to cool to room temperature. In this method, the length of the cooling duct D2 is limited when the installation distance between the drying step and the exposure step of the panel is short. Attention is drawn to the setting of the cooling rate that does not adversely affect the panel and the coating film formed thereon. Will be required.

As described above, since each means that can be used in the temperature correction step of the present invention has its advantages and disadvantages, it may be preferable to use at least one or more of the above means in parallel. For example, a method in which a panel heated by drying or the like is held for a predetermined time and then coupled to the mask heated at an appropriate temperature is added to the exposure process, or a panel is cooled while simultaneously cooling the panel.

After the temperature correction, the panel and the mask, which are coupled to each other and are installed on the exposure table, can be accurately exposed because the mask is not doped by the radiant heat of the panel, thereby producing a high-quality fluorescent surface. In particular, when the mask is heated to allow the frame to expand with the shadow mask, the secondary doming phenomenon generated in the mask under exposure can also be prevented by an exposure light source that generates high heat, thereby ensuring more accurate exposure. do.

As described above, according to the present invention, an exposure defect is prevented, thereby producing an effect of producing a high quality panel.

Claims (4)

A method of manufacturing a color-brown tube of photolithography, in which a slurry in which a phosphor is formed on a panel is applied and dried, and then exposed by combining a mask in an atmospheric state, the temperature correction step of reducing a temperature difference between the panel and the mask before the exposure step. Color brown tube panel manufacturing method characterized in that it is included. The method of claim 1, wherein the temperature correction step comprises a method of cooling the panel. The method of claim 1, wherein the temperature correction step is performed by heating the mask to a predetermined temperature. Color-brown tube including a transfer line for sequentially applying and drying the slurry on the panel, a transfer line for transferring the mask corresponding to the panel, and an exposure apparatus for combining and exposing the mask and the panel transferred to the two transfer lines The apparatus of claim 6, wherein at least one of the two transfer lines is provided with a temperature compensation duct for compensating a temperature difference between the panel and the mask.