JPH03254049A - Color crt electroconductive film for high contrast - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a conductive film provided on the surface of a color cathode ray tube face plate for the purpose of preventing static electricity and increasing contrast, and in particular, a conductive film that has sufficient antistatic function and The present invention relates to a high-contrast conductive film for color cathode ray tubes that exhibits excellent contrast even in bright external light and is less susceptible to deterioration due to ultraviolet rays.

[Prior Art] Conventional technologies related to this type of content include (a) using an alkali ion as a conductive material and using a hydrolyzed solution of alkylsilane to add a dye that absorbs between green and red light emission in order to increase the contrast; (0) A stabilizing solution of a reaction product of a hydrolyzable organic silicate and an organic dye is coated on the surface of a cathode ray tube. A method for coloring cathode ray tube glass (Japanese Unexamined Patent Application Publication No. 63-30346), (c) using glass containing neodymium oxide as the cathode ray tube face glass, and having two or more emission spectra other than the cathode ray tube between the cathode ray tube and the observer. A method of increasing contrast by interposing a film containing an absorbing substance (organic dye, etc.) in the region (JP-A-59-2219)
No. 43) and other proposals have been made.

[Problems to be Solved by the Invention] However, each of the above conventional methods cannot be said to exhibit sufficiently satisfactory performance. Each problem will be briefly explained below.

First, in method (a), since alkali ions are used as the conductive substance, there is a risk that water in the film will be lost over long-term use, resulting in a decrease in conductivity and deterioration of the antistatic function.

In addition, since organic dyes are used, there is a risk of deterioration and fading due to sunlight, ultraviolet rays contained in fluorescent lamps, etc.

Furthermore, method (b) is a method of simply coloring the glass surface, which may interfere with the light emission of the cathode ray tube, causing a change in the emitted light color and a decrease in brightness.

In addition, in method (c), the use of neodymium oxide-containing glass as the face glass leads to high costs, and the addition of substances that absorb in regions other than the cathode ray tube emission spectrum into the organic film produces high-contrast images. However, organic films have the drawback of having low strength and lack of durability. Furthermore, even if an appropriate organic dye is selected, there is no substance that completely absorbs only the region other than the cathode ray tube emission spectrum, and it absorbs light in some wavelength range of each emission, and g! When viewed from the observer, it is dark and the color is bright (
There was a risk that the sharpness would be lost. This phenomenon becomes particularly noticeable when the outside light is bright.

The purpose of the present invention is to solve the problems of the prior art described above, and to provide a color that has sufficient antistatic function, exhibits excellent contrast even in bright external light, and is less susceptible to deterioration due to ultraviolet rays, etc. An object of the present invention is to provide a conductive film for high contrast in a cathode ray tube.

[Means for solving the problem] The above object is to apply an alkylsilane containing ATO ultrafine particles having an antistatic function and a fluorescent dye having a fluorescence emission function and a light absorption function to the surface of a color cathode ray tube face plate. By providing a conductive film coated with a hydrolyzate, which has a function of preventing * and a function of emitting fluorescence in the emission spectrum region of the cathode ray tube, and also has a light absorption function in a region other than the emission spectrum of the cathode ray tube. can be achieved.

Acid red (
Sulforhodamine) dyes and fluorescent dyes with absorption in the range of 300-400 nm are used.

[Function] First, the presence of ATO in the film imparts conductivity to the film.

In addition, sulforhodamine has absorption in the region between the green and red emission spectra of color cathode ray tubes, and has an absorption of 570n1.
Since fluorescence is emitted at 610 to 620 nu by light with a wavelength around 1, reflection of external light is weakened and contrast is improved.

In addition, the fluorescent dye having absorption in the range of 300 to 400 nm is added to prevent the deterioration of the sulforhodamine due to ultraviolet rays and to provide fluorescence in the blue region.
This addition can prevent the deterioration of sulforhodamine and further increase the brightness of the emitted color.

[Example 2] Hereinafter, the structure of the conductive film for high contrast color cathode ray tube of the present invention will be explained in detail.

First, the surface of the 29-inch color cathode ray tube face plate was washed with an alkaline detergent, thoroughly washed with city water, and finally washed with pure water, and then dried by blowing air at 40 to 45° C. through an absolute filter. Next, while rotating the cathode ray tube horizontally at 7 rpm, a solution having the composition shown below was poured into the center of the face plate, and the tube was rotated for 120 seconds to form a coating layer of uniform thickness.

Conductive coating liquid (Sumi Sefin AS-1) 99.94
%Sulforhodamine (Acid Red) 0.03%
White fluorescent dye (Icophor B) 0.03%
Further, the cathode ray tube was placed in a firing furnace and fired at 130'C20 minutes 1'' to obtain a cathode ray tube having a film thickness of about 0.4 mm.

As a result of testing this film, the surface glossiness (gloss value)
98, a surface resistance of 5 x 10''Ω/mouth, and a transmittance characteristic (absorption spectrum) a as shown in FIG. 1 were obtained.

Figure 1 also shows the fluorescence spectrum b of sulforhodamine.
, the fluorescence spectrum C of the white fluorescent dye and the emission spectrum d of the color cathode ray tube are shown.As can be seen from the results in the figure, reflection of external light is reduced by sulforhodamine absorbing light between green and red. In addition, the two fluorescent dyes emit fluorescence in the blue and red light emitting regions of the cathode ray tube when exposed to external light, increasing the brightness of the emitted color. These characteristics are summarized in Table 1 in comparison with the case of the prior art.

Table 1 Present invention Prior art 95 100 110 100 Light red-purple Light gray-green Good Normal 895 5×1O° 10” Bright white luminance with the conductive film of the present invention Contrast Appearance Color Brightness of luminescent color Surface glossiness Surface resistance From the results in this table, we can see that the surface gloss of the lamp tube increases slightly, and although the brightness decreases slightly when operated with the same power, the contrast and vividness of the emitted color are greatly improved, and the antistatic effect It can be seen that clear images with high contrast, which is an important element of color cathode ray tubes, can be obtained because there is no adhesion of dirt due to dust etc.Also, sulforhodamine has a tendency to fade slightly, but it absorbs ultraviolet rays. By adding a white fluorescent dye, harmful ultraviolet rays can be absorbed and sufficient durability can be obtained.

In the above example, a film with a smooth surface with relatively small irregularities was explained, but it is also possible to apply the coating film to a film made of fine particles with a particle size of 30 to 40μ by a spray method. A good anti-glare effect was obtained.

[Effects of the invention] As described above, by using the conductive film on the surface of the color cathode ray tube face plate as a high contrast conductive film having the structure of the present invention, the problems of the prior art can be solved and sufficient It was possible to provide a conductive film for high-contrast color cathode ray tubes that has an antistatic function, exhibits excellent contrast even under bright external light, and exhibits little deterioration due to ultraviolet rays and the like.

[Brief explanation of drawings]

Figure 1 shows the transmittance (absorption spectrum) a of the conductive film of the present invention.
is a diagram showing the fluorescence spectrum B of sulforhodamine, the fluorescence spectrum C of a white fluorescent dye, and the emission spectrum of a color cathode ray tube.

Claims (1)

[Claims] 1. Antimony/tin oxide (Antimo
nyTinOxide (ATO) is coated with an alkylsilane hydrolyzate containing ultrafine particles and a fluorescent dye that has a light absorption function and a fluorescence emission function, and has an antistatic function and is in the emission spectrum region of a cathode ray tube. 1. A conductive film for use in high contrast color cathode ray tubes, characterized in that it has a function of emitting fluorescence and a function of absorbing light in a region other than the emission spectrum of a cathode ray tube.