KR20000009405A - Image display panel having transparent conductive light select and absorbing film, manufacturing method thereof and coating solution thereof - Google Patents

Abstract

PURPOSE: An image display panel having transparent conductive light select and absorbing film, manufacturing method thereof and coating solution thereof is provided to enhance antistatic characteristic, contrast and color reproduction. CONSTITUTION: The present invention discloses an image display panel having transparent conductive light select and absorbing film which the light select and absorbing film(2) is transparent and electrically conductive and contains Nd2O3. The Nd2O3 is dispersed in ethanol which one of SnO, An O is mixed, ethylsilicate is added in, and pure water and inorganic acid catalyst is added. Further, the light select and absorbing film(2) has reflection prevention function in itself or is coated by non-reflective film.

Description

An image display face plate having a transparent conductive light selective absorption film, a method of manufacturing the same, and a coating solution thereof

The present invention relates to an image display face plate having a transparent conductive photo-selective absorption film for improving contrast on the image display face plate, a method for manufacturing the same, and a coating solution thereof. And a film of an image display face plate, particularly a screen panel of a cathode ray tube, to which the light selective absorptivity is improved and antistatic property is provided, if necessary.

A useful way to increase the image contrast of the fluorescent surface of the cathode ray tube is to lower the light transmittance of the faceplate glass of the fluorescent surface. In particular, in the emission wavelength band of the red phosphor, there is a sub emission band 575 nm in addition to the main emission band 625 nm, which lowers the color purity of the red phosphor. If the light transmittance is lowered, the contrast can be improved while improving the color reproduction range.

As a conventional method for providing an antistatic property on the surface of an image display panel, a method of improving contrast of a fluorescent surface by incorporating neodymium oxide (Nd ₂ O ₃ ) in the face plate glass itself.

However, this method shows that glass containing neodymium oxide (Nd ₂ O ₃ ) has a steep main absorption over 560-615 nm and 490-540 nm (including Green emission band) as shown in FIG. 3 by intrinsic properties. Since the thickness of the faceplate glass varies greatly between the center and the edge portion, the thickness of the faceplate glass has a problem of causing a nonuniformity of the luminance in the luminance, the green phosphor emission luminance.

Therefore, the present invention can significantly lower the light transmittance of the red sub-band (575 nm) by forming a transparent film on the face plate using a light selective absorbing material that absorbs the red sub-band region of the red to improve the contrast An object of the present invention is to provide an image display face plate which expands a color reproduction range, a manufacturing method thereof, and a coating solution thereof.

1 is a schematic diagram of a multi-faceted model of a fluorescent surface of a color cathode ray tube,

Fig. 2 is a side view showing an image display face tube on which a light selective absorption film according to the present invention is formed;

3 is an intrinsic characteristic diagram of a glass containing neodymium oxide (Nd ₂ O ₃ ),

Figure 4 is a characteristic diagram according to the light selective absorption film of the present invention.

<Description of Major Symbols Used in Drawings>

1: faceplate glass 2: photoselective absorption film

In order to achieve the above object, in an image display face plate having a light selective absorption film formed on an outer surface thereof according to an embodiment of the present invention, the light selective absorption film is transparent and has electrical conductivity, and is made of neodymium oxide (Nd ₂ O ₃ ). It is characterized in that the light-selective absorption film containing a, the method of manufacturing, dispersing neodymium oxide (Nd ₂ O ₃ ) in ethanol, and mixed at least one of tin oxide, antimony oxide, which is a conductive metal oxide, A photoselective absorption film is formed by adding ethyl silicate as an adhesive, adding pure water and an inorganic acid catalyst for hydrolysis, and then applying a coating solution of a suspension prepared by adding isopropyl alcohol to improve dryness. Silver also provides such a coating solution.

The coating solution contains 0.1 to 10% of neodymium oxide (Nd ₂ O ₃ ), 0.1 to 5% of at least one of tin oxide, indium oxide and antimony oxide, which are conductive metal oxides, and contains 1 to 1 ethyl silicate. 20%, 10% to 90% ethanol, 1% to 50% isopropanol, 1% to 50% water, and the photoselective absorbent film itself has an antireflection function. Or an antireflective coating may be formed thereon, and the coating solution is applied to the outer surface of the panel by spin coating, spray coating, dip coating, or a combination of these coatings, and the resulting coating is heated at about 150 ° C. Is formed.

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

1 is a multi-faceted model of a fluorescent surface of a color cathode ray tube. (1) is a faceplate glass, The inner surface is provided with the three-color fluorescent element group 2 of red, green, and blue. Now, the intensity of the extraneous light incident on the faceplate glass 1 of the color cathode ray tube constructed as described above is reflected by the fluorescent surface (E ₀ ), and then the intensity of the reflected light emitted outside the faceplate glass 1 (E _1). ), The light transmittance (T _f ) of the face plate glass (1), the reflectance of the three-color phosphor element group 2 of red, green, and blue (R _p ), and the emission intensity of the phosphor element group (2) (F). ₀ ), if the fluorescent light output from the outside of the faceplate glass is (F ₁ ),

E ₁ = E _{0 ×} R _{P ×} T _f ² -------- (Ⅰ)

F ₁ = F _{0 ×} T _f ------------- (Ⅱ)

Becomes Another great contrast (C)

C = (E ₁ + F ₁ ) / E ₁ -------- (Ⅲ)

Since it can be defined as (III) by substituting (Ⅰ) (Ⅱ) for (III)

C = 1 + F ₀ / E ₀ * R _P * T _f -------- (Ⅳ)

Becomes In other words, it is obvious that the light transmittance T _f must be lowered to improve the contrast by the formula (IV) of the cathode ray tube.

Accordingly, the present invention, by forming a transparent film on the face plate using a light selective absorbing material that absorbs the red light emitting band region of the red as shown in Figure 4 to significantly increase the light transmittance of the red light emitting band (575nm) of red. It can be lowered to improve contrast and broaden the color gamut.

An embodiment of the present invention will be described with reference to FIG. 2.

After dispersing the photoselective absorbing material neodymium oxide (Nd ₂ O ₃ ) in an alcohol solution of an alkoxysilane [Si (OR) ₄ , R is an alkyl group], tin oxide, indium oxide, and oxidation, which are conducting metal oxides, for imparting conductivity At least 1 type of antimony is mixed and a suspension is prepared. Water and an inorganic acid catalyst are added to the suspension to complete the photoselective absorption conductive solution.

Next, a conductive solution is dropped on the panel of the CRT (1) which is rotating at 130 rpm with the panel surface placed thereon to form a thin and uniform antistatic film. This spin coating is completed in about 1 minute 30 seconds. Finally, the film is baked at 150 ° C. for 30 minutes to complete the formation of the light selective absorbing film 2 having the antistatic function on the panel surface.

As a result of many experiments, the coating solution contains 0.1 to 10% of neodymium oxide (Nd ₂ O ₃ ), and contains 0.1 to 5% of at least one of tin oxide, indium oxide and antimony oxide, which are conductive metal oxides, Containing 1 to 20% of ethyl silicate, 10 to 90% of ethanol, 1 to 50% of isopropanol, and 1 to 50% of water resulted in desirable results.

The content and results of an example experimented within the above range were as follows.

Solution component content

Neodymium oxide (Nd ₂ O ₃ ) 2%

Ethyl silicate 3%

Tin Oxide 0.6%

Antimony Oxide 0.1%

Ethanol 75.3%

Isopropanol 7%

Pure 12%

HC1 0.01%

The surface resistance for measuring the electrical conductivity by coating with the above solution, the pencil strength of the film, and the light transmittance of the faceplate glass 1 were measured.

1.Surface Resistance: 3.67 × 10 ⁹ Ω / □

2. Membrane strength: 7H

3. Faceplate glass light transmittance: 575nm area 68%

Therefore, in the case of the present invention, by forming a light selective absorption film using neodymium oxide (Nd ₂ O ₃ ) on the image display face plate, it has an antistatic property by containing metal oxide and at the same time the brightness of the image display panel according to the change in thickness The change, i.e., the difference in luminance between the center part and the periphery or the corner, is eliminated, and the selective light absorption enables the contrast enhancement and the color reproduction range to be expanded.

According to the embodiments of the present invention described above, according to the configuration and the result of the image display surface plate and the manufacturing method and the coating solution formed thereon a transparent conductive light selective absorption film, using neodymium oxide (Nd ₂ O ₃ ) By forming a light selective absorption film, it is possible to eliminate the change of brightness due to the change of thickness of the image display panel together with the antistatic property, and to improve the contrast and expand the color reproduction range by selective light absorption. There is.

Claims (9)

In the image display face plate in which the light selective absorption film 2 is formed on the outer surface, The photo-selective absorbing film (2) is an image display face plate having a light-selective absorbing film, characterized in that it is a transparent, electrically conductive, light-selective absorbing film containing neodymium oxide (Nd ₂ O ₃ ). 2. The method of claim 1, wherein neodymium oxide (Nd ₂ O ₃ ) is dispersed in ethanol, at least one of tin oxide and antimony oxide, which are conductive metal oxides, is mixed, and then ethyl silicate is added as an adhesive, for hydrolysis. An image display face plate having a light selective absorption coating film formed by adding pure water and an inorganic acid catalyst, and then applying a coating solution of a suspension prepared by adding isopropyl alcohol to improve dryness. The coating solution according to claim 2, wherein the coating solution contains 0.1 to 10% of neodymium oxide (Nd ₂ O ₃ ), and 0.1 to 5% of at least one of tin oxide, indium oxide and antimony oxide as conductive metal oxides. And 1 to 20% of ethyl silicate, 10 to 90% of ethanol, 1 to 50% of isopropanol, and 1 to 50% of water. 3. The image display faceplate according to claim 1 or 2, wherein the photoselective absorption film (2) has an antireflection function on its own or an antireflection coating is formed thereon. In the manufacturing method of an image display face plate for forming the light selective absorption film (2) on the outer surface of the image display face plate, Disperse neodymium oxide (Nd ₂ O ₃ ) in ethanol, mix at least one of tin oxide and antimony oxide, which are conductive metal oxides, add ethyl silicate as an adhesive, and add pure and inorganic acid catalysts for hydrolysis. After that, the coating solution of the suspension prepared by adding isopropyl alcohol to improve the drying property is applied to the outer surface of the image display face plate to form a photo-selective absorption film, characterized in that the manufacturing of the image display face plate with a photo-selective absorption film is formed Way. The method of claim 5, wherein the coating solution is formed by spin coating, spray coating, dip coating, or a combination of these coatings on the outer surface of the face plate of the panel, and the resulting coating film is formed by heat treatment at about 150 ℃. A method of manufacturing an image display face plate on which a photoselective absorption film is formed. 7. The coating solution according to claim 5 or 6, wherein the coating solution contains 0.1 to 10% of neodymium oxide (Nd ₂ O ₃ ), and 0.1 to at least one of tin oxide, indium oxide and antimony oxide as conductive metal oxides. 5%, 1 to 20% ethyl silicate, 10 to 90% ethanol, 1 to 50% isopropanol, and 1 to 50% water. Method for manufacturing an image display face plate. In the antistatic film coating solution of the image display face plate for applying to the outer surface of the image display face plate to form the light selective absorption film 2, Disperse neodymium oxide (Nd ₂ O ₃ ) in ethanol, mix at least one of tin oxide and antimony oxide, which are conductive metal oxides, add ethyl silicate as an adhesive, and add pure and inorganic acid catalysts for hydrolysis. And then isopropyl alcohol is added to improve the dryness, thereby preparing a suspension. 10. The method according to claim 8, which contains 0.1 to 10% of said neodymium oxide (Nd ₂ O ₃ ), and contains 0.1 to 5% of at least one of tin oxide, indium oxide and antimony oxide, which are conductive metal oxides, and ethyl silicate. An antistatic film coating solution for an image display faceplate containing 1 to 20%, 10 to 90% ethanol, 1 to 50% isopropanol, and 1 to 50% water.