JPH0818848B2 - Image display device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an image display device in which a glass surface is coated with a coloring solution and then heated to permanently color the glass surface.

[Conventional technology]

It is known that glass can be produced by putting glass-coloring components in a glass batch and melting the glass to color the glass. However, this glass coloring method is difficult to apply when it is desired to manufacture glass products colored in a plurality of colors or partially colored glass products. Thus, there has been a need for a method that allows the glass product to be dyed or colored after it has been melted, shaped and cooled to ambient temperature. To meet such a demand, a low melting point colored glass frit coating has been conventionally used. In addition, a method of coating a solution of a reaction product of a hydrolyzable organic titanate and an organic dye on the surface of a glass product and then heating it is disclosed in Japanese Patent Publication No.
-2315 gazette.

[Problems to be solved by the invention]

However, the prior art low melting colored glass frit coating method described above is not a satisfactory solution to the need for colored transparent products because the glass frit is usually opaque. Further, in the method of coating the solution of the reaction product of the organic titanate ester,
Although it is an effective method for coloring glass products, the hydrolysis reaction of tetraisopropyl titanate, which is an organic titanate ester, is very fast, and thus there is a problem that it is not easy to manage the liquid such as handling and storage.

INDUSTRIAL APPLICABILITY The present invention has a slower rate of hydrolysis as compared with a hydrolyzable organic titanate ester, and thus has a stable liquid and does not deteriorate with time. Depending on the characteristics, all coating methods can be applied, and a coating film with high film strength can be obtained even at low temperature heating of 200 ° C or less, and it can also be applied to substrates that cannot be heated too much. The glass surface was colored by solution coating. An object is to provide an image display device.

In particular, a cathode ray tube for display such as a picture tube for television,
An object of the present invention is to provide an image display device which can be applied to a finished product such as a liquid crystal display device and can achieve stabilization of a coating film at a curing temperature of about 100 to 200 ° C.

[Means for solving problems]

In order to solve the above problems, in the present invention, a hydrolyzable organic silicate and an organic dye are used as a colored solution which is easy to apply, and is capable of forming a transparent and durable colored film on the glass surface of an image display device. It was decided to use a stable solution of the reaction product with.

[Action]

As a method for forming a solution for coloring the glass surface of an image display device, a stable organic silicate solution is prepared, and an organic dye is added to this solution. This operation can be performed at room temperature and atmospheric pressure. To apply this solution to the glass surface, any of a dip pulling method and a spraying method can be applied.

The amount of dye used in the coloring solution is difficult to exhibit a fixed amount. In fact, it was possible to give a sufficiently satisfactory coloration with a dye which was not too large. Lighter shades can be achieved in the context of organic silicates by using lesser amounts of dyes or by lowering the concentration of reaction products in solution. Further, dyes may be combined to obtain various colors or shades. Furthermore, the light stability of the colored surface of the finished glass can be improved by adding a metal salt to the coloring solution.

〔Example〕

The organic silicate solution used in the present invention has, for example, the formula Si
An ethyl silicate having (OR) ₄ (R represents an alkyl group). In order to impart the performance as a film forming agent or a binder to this ethyl silicate, a small amount of H ₂ O is added to an alcohol solution of ethyl silicate dissolved in a solvent, and the reaction is performed in the presence of a catalyst. obtain. The solvent is mainly ethanol, isopropyl alcohol, or the like. As a catalyst, by adding an acid such as nitric acid or hydrochloric acid, the reaction is gently promoted and it also serves as a stabilizer for the silica sol.

Many organic dyes can be used as the organic dye used in the present invention. That is, azo dyes, anthraquinone dyes, indigoid dyes, phthalocyanine dyes, carbonium ion dyes, and other dyes may be selected according to the purpose such as the shape and color of the colored product, and the present invention is not limited to the use of such dyes. Not done.

The coloring solution can be prepared by adding a solvent, water and a catalyst to ethyl silicate, mixing them, and then adding an organic dye or a metal salt and mixing them at room temperature. The coloring solution is applied to the glass surface of the image display device at room temperature or under heating the substrate to be coated at 60 ° C or lower. This application can be carried out by spraying, dipping, spin coating or any convenient method which can be used for uniform coating. The reaction product of the organic silicate and the organic dye is presumed to have a certain chelate structure. Also, the bond to the glass
It is presumed that the Si—O—Si bond and Si—OH strongly adhere. After applying the coloring solution to the glass surface, the product is heated to cure the paint film. This heating must be carried out for a sufficient time and temperature conditions to enhance the photostability of the coating coating color stability and the coating strength. The present invention can be applied to coloring not only glass surfaces but also plastics and the like.

In order to illustrate the invention, examples are given in Table 1. Ethyl silicate, solvent, in the amounts shown in the table,
After adding water and nitric acid and mixing, an organic dye or a metal salt is added to prepare a coloring solution. Next, the glass surface (plate glass) was preheated to 50 ° C., and this coloring solution was spray-coated on the plate glass. Then, it was cured by heating at 150 ° C. for 30 minutes. The coloring of the glass surface with the coloring solution of the present invention is due to the fact that a light-stable and strong coating can be formed.
Furthermore, the colored solution of the present invention is easy to handle and manage because it has a slow reaction.

〔The invention's effect〕

As described above, according to the present invention, it is not necessary to color the glass substrate itself, and various kinds of coloring can be easily performed only by coating on a colorless substrate, which is very economical and easy to use. Is advantageous to. In addition, it can be easily realized by simply coating various types and amounts of solutions in response to various types of optical characteristic demands such as display tubes, particularly television picture tubes.

Furthermore, since it is possible to form a stable and strong colored film at a temperature of 200 ° C or lower, the cathode ray tube can be colored in a temperature range where the electron emission characteristics are not deteriorated, and the liquid crystal display element can be colored at 70 ° C or lower at which the liquid crystal is not damaged. Therefore, it becomes possible to paint in the final process after the product is completed, and the material is not wasted due to the damage of the film in the intermediate process, which greatly contributes to the reduction of the manufacturing cost. This colored film can be scraped off with a polishing material for glossy polishing, and thus can be recycled.

A further important effect of the present invention is that fine irregularities of silica (0.1 to 1.0 μm) are formed in the case of spray coating,
The difficulty of viewing an image due to the regular reflection of external light, which is a problem in display tubes and the like, can be solved by imparting the property of diffusely reflecting external light at the same time as coloring. Thus, the coloring and the antiglare treatment can be simultaneously performed in one step, which is very economical.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takao Kawamura 3300 Hayano, Mobara-shi, Chiba Hitachi Mobara factory (72) Inventor Akira Triangle 3300 Hayano, Mobara-shi, Chiba Hitachi Mobara plant, Inc.

Claims (1)

[Claims] 1. A colored film, which is a reaction product of a hydrolyzable organic silicate and an organic dye, is coated on a glass surface, and a colored film is formed by curing the coated colored solution. Image display device.