KR930005592B1 - Method of forming black matrix on crt panel - Google Patents

Abstract

The black matrix of a cathode ray tube (CRT) is formed by (a) covering a polyvinyl pyrrolidone-photosensitive liquor onto the inner surface of the panel for the CRT, and then drying it, (b) light-exposing it by the ultraviolet irradiation of 200-500 nm wave length for 2-5 sec., (c) bonding a mask onto the inner surface of the panel, and (d) light-exposing it, coating it with a colloidal graphite, and then etching it.

Description

Method of Forming Black Matrix on Cathode Ray Tube Panel

The present invention relates to a method of forming a black matrix on a panel inner surface that partitions a phosphor pattern of a colored cathode ray tube, and more particularly, to a method of forming a black matrix of a cathode ray tube panel surface suitable for a polyvinylpyrrolidone-based photosensitive agent. .

The black matrix is formed by applying a colloidal abyss to the inner surface of the panel, and the process is as follows.

A photosensitive paint is deposited on the inner surface of the cathode ray tube panel, and a mask for forming a matrix is brought into close contact therewith, followed by exposure development, colloidal graphite coating, and etching through this mask to develop a desired black matrix. .

In such a black matrix forming step, polyvinyl pilolidone is used as the photosensitizer.

In this case, a problem arises in that the exposure time is different for each of the R, G, and B stripes forming the phosphor pattern.

For example, a G-stripe of 5.6 seconds, a B stripe of 5.2 seconds, and an R stripe of 5 seconds each require exposure to obtain a desired patterned stripe.

The reason that the exposure time is different for each pattern is that the reaction disturbing elements such as moisture and oxygen contained in the applied photosensitive agent decrease as the exposure is repeated, and the reaction is better as the subsequent exposure is performed. It will be short.

However, since the exposure time difference of each pattern stripe is in microsecond units as different, there is a disadvantage that it is difficult to manage.

The present invention provides a new method of forming a black matrix with little difference in exposure time of each stripe in order to solve the disadvantages of the method of forming a black matrix described above.

To achieve the above object, the present invention is applied by drying the photosensitive paint on the inner surface of the cathode ray tube panel, and then pre-exposure by irradiating the entire inner surface of the cathode ray tube panel with ultraviolet rays of wavelength 200-500nm for 2-5 seconds, Next, the mask is brought into close contact with the inner surface of the cathode ray panel, followed by exposure development, colloidal graphite diagram, and etching development via the mask.

In this way, after the photosensitive liquid is applied to the inner surface of the cathode ray tube panel, the entire surface is pre-exposured and the main exposure is carried out, so that even if the exposure time of each of the R, G, and B stripes is uniformly managed, the width of each stripe is constant. Is formed.

Hereinafter, the present invention will be described in detail as a preferred embodiment.

A polyvinyl pilolidone-based photosensitive liquid is applied to a cathode ray tube panel whose inner surface is washed with pure water and dried.

The dried panel is mounted in a conventional exposure apparatus, and is exposed to ultraviolet rays of 200-500 nm, and the entire inner surface of the panel is exposed for 2-5 seconds, preferably 3 seconds, to be pre-exposured.

Next, this exposure is performed while interposing a mask for forming a matrix on the inner surface of the panel.

In this exposure, mercury-excited ultraviolet light is used as a light source according to a conventional method, and only the exposure time of each of the R, G, and B stripes is exposed for the same time for 10 to 20 seconds, preferably 15 seconds.

The exposed panel is lowered and developed in the exposure apparatus. In the development process, the non-exposed part is cleaned so that only the exposed part, which becomes a black matrix, remains on the inner surface of the panel.

The developed panel is dried by infrared rays, and then colloidal graphite is applied on it.

Colloidal graphite is applied evenly over the inner side of the panel.

The graphite coated panel is washed again with pure water so that the graphite applied to the etched non-exposed part is washed away and the desired black matrix remains on the inner surface of the panel.

In the method of the present invention as described above, by applying and drying the photosensitive liquid and then pre-exposure the whole under the same conditions to remove the water or oxygen, which causes obstacles in the photosensitive process, they cause a problem in the photosensitive process. Since the matrix pattern has a uniform stripe width, a matrix pattern can be obtained, and the exposure time does not need to be managed for each stripe in the present exposure process, so that the matrix pattern can be more easily performed. It also provides a quality improvement that makes screen brightness uniform.

Claims (1)

In forming a black matrix by applying polyvinyl pilolidone-based photosensitive liquid to the inner surface of the cathode ray tube panel, the photosensitive liquid is applied to the inner side of the panel and dried, and then the inner surface of the cathode ray tube panel which is exposed to ultraviolet rays having a wavelength of 200 to 500 nm. After preliminary exposure by irradiating for 2-5 seconds, the mask is brought into close contact with the inner surface of the cathode ray tube panel, and then subjected to exposure development, colloidal graphite coating, and etching development through this mask. Method for forming black matrix of cathode ray tube panel.