KR100189614B1 - Color braun tube - Google Patents

Abstract

The present invention relates to the application of the fluorescent material and color filter of the color tube, in particular to simplify the coating and exposure process to reduce the cost of the product and improve the quality, in applying the fluorescent surface to the inner surface of the color tube panel, BM In order to exclude the layer coating exposure process and the three-color phosphor coating process, a white light-emitting phosphor coated with R, G, and B phosphor particles evenly mixed on the fluorescent surface, and the BM layer, R transmission layer, and B transmission on the outer surface of the panel It is equipped with the color filter which consists of a layer and a B permeable layer.

Description

Color CRT

1 is a cross-sectional view of a conventional color-brown tube.

2 is an enlarged cross-sectional view of a panel portion of a conventional color-brown tube.

3 is a cross-sectional view of the present invention brown tube.

Figure 4 is an enlarged cross-sectional view of the panel portion of the present invention brown tube.

* Explanation of symbols for main parts of the drawings

101: panel 102: fluorescent surface

103: white light emitting phosphor 104: color filter

105: R phosphor 106: G phosphor

107 B phosphor 108 BM layer

109: R transmission layer 110: G transmission layer

111: B transmission layer

The present invention relates to the phosphor coating and color filter action of the color CRT, in particular to simplify the application and exposure process to reduce the cost and quality of the product.

The conventional color CRT consists of a panel 1 and a panel 2, as shown in FIG. 1, and a fluorescent surface 3 is coated on the inner surface of the panel 1.

The fluorescent surface 3 is a part which reproduces the color image for the ultimate use of the color CRT and delivers it to human vision. The fluorescent surface 3 is an optical light element that converts image information received as an electric signal into visual information. R, G, and B phosphors having three primary emission spectra (5), (6), and (7) pixels and a light-absorbing black material (4) (also referred to as BM) panel 1 are applied separately by coating. It is.

Therefore, the manufacturing process is much more complicated and complicated than the manufacture of fluorescent screens of monochrome CRTs coated with only monochromatic phosphors, and the application of a wide range of technologies is required in various fields such as optics, chemistry, and materials even in technical problems.

2 is an enlarged cross-sectional view showing the fluorescent surface 3 applied to the inner surface of the panel 1 in detail, thereby illustrating the manufacturing process of the fluorescent surface 3 of the color CRT.

The fluorescent surface manufacturing process of color CRT can be largely divided into a light absorbing black material coating process, that is, a BM (Black Matrix) (4) coating process and a three-phosphor pixel coating process (PH (PHOSPHOR) coating process).

First, the BM (4) process

Panel washing → drying → photoresist injection → drying → three-color exposure → developing → drying → graphite coating → drying → etching → graphite development → sealing and skirt processing → drying.

And PH process

Cleaning → Pre-Coat → G-phosphor injection → Drying → Exposure → Development → Drying → Type B injection → Drying → Exposure → Development → Drying → R phosphor injection → Drying → Exposure → Developing → Drying → Emulsion It is made of application.

In addition, the fluorescent surface of the shadow mask type color CRT is formed by using a photographic technique, and the phosphor of this type is composed of phosphor pixels in which dots or strips are formed.

Such a fluorescent surface forms a shadow mask as a subject during exposure in order to strike the three electron beams emitted from the electron gun for each pixel exactly at a predetermined phosphor pixel position. Therefore, the shadow mask used has a problem that must follow the panel continuously during the process.

In addition, the BM coating and exposure process and the three-phosphor coating and exposure process are required to form the fluorescent surface, and the shadow mask, which is a subject during exposure, becomes complicated and technical difficulties occur.

In addition, there are many kinds of chemicals needed during the application process, and it is difficult to manage the phosphors separately for R, G, and B. Also, if the shadow mask is changed or defective during the process, the panel applied during exposure is also changed or defective. This causes a problem that the panel applied during exposure is also treated as defective.

In view of this point, an object of the present invention is to apply a white light-emitting phosphor in which R. G. B phosphor particles are evenly mixed on the inner surface of the panel, and to attach a color filter to the outer surface of the panel to realize a color image.

Referring to Figure 3 the present invention the brown tube, as follows.

In applying a fluorescent surface to the inner surface of the color CRT panel 101, a white light emitting phosphor 103 was applied to the fluorescent surface 102, and a color filter 104 was provided on the outer surface of the panel 101.

The white light-emitting phosphor 103 is coated with evenly distributed particles of R phosphor 105, G-phosphor 106, and B-phosphor 107, and the white light-emitting phosphor 103 is applied in a single layer.

In addition, the color filter 104 includes a BM layer 108, an R transparent layer 109, a G transparent layer 110, and a B transparent layer 111.

Therefore, the separate BM coating exposure concentration and the three-color phosphor coating exposure process are unnecessary, and the shadow mask required at the time of exposure is also unnecessary, thereby simplifying the process.

Therefore, the manufacturing process on the fluorescent surface of the present invention is as follows.

Panel cleaning → drying → precoat → white phosphor injection → drying → emulsion coating.

Here, unlike the conventional fluorescent tube manufacturing process of the color CRT, there is no BM layer coating exposure process, and the shadow mask and the exposure process are performed on the white phosphor 103 mixed with RG B phosphor particles without separately applying the RG B phosphor. All you need is a single layer.

However, the color filter 104 attached to the outer surface of the panel 101 is manufactured by conventional manufacturing methods such as dyeing, pigment dispersion, electrodeposition, printing, and interference, and is used to hit the fluorescent surface of the electron beam in the final process of the color brown tube. Accurately match and attach to the luminescent position by means of a microscope.

The color-brown tube of the present invention configured as described above has a light having a dominant red wavelength of 780 mm and a light having a dominant green wavelength of 554 mm by hitting the snow white phosphor 103 mixed with RG B phosphor particles. At the same time, the light having a brown dominant wavelength of 480 mm emits light simultaneously, thereby generating white light.

At this time, the white light generated at the fluorescent surface 102 passes through the panel 101 to reach the color filter 104 attached to the front of the panel.

The color filter 104 is composed of the BM layer 108, the R transmission layer 109, the G transmission layer 110, and the B transmission layer 111, and the white light reaching the color filter 104 is the color filter 104. The wavelength selective transmittance of R transmits only the wavelength of 780mm, which is the dominant wavelength in R transmission layer, and the wavelength of 554mm that is green in G transmission layer, and the wavelength of 480mm, which is brown in B transmission layer. It is possible to reproduce the color image of the color CRT by transmitting only light and absorbing light in the BM layer.

In addition, by using the color filter 104, the screen can be flattened, and the deterioration of the quality due to the difference in focus between the periphery and the center of the screen due to the electron beam can be prevented, thereby enabling the high quality and high definition of the product.

In addition, the white phosphor used herein may use a phosphor that emits white light, or a mixture of R. G. B phosphors may be used. In this case, the ratio of R. G. B phosphors may be adjusted to a desired white color.

The color CRT according to the present invention applies a white phosphor layer to the fluorescent surface of the inner surface of the panel as a single layer and attaches a color filter to the outer surface of the panel, so that the BM layer and the three-color phosphor can be formed on the fluorescent surface as independent pixels on the surface. Therefore, the application and exposure process are not necessary, and the shadow mask used as the subject during exposure also does not need to be separately used during the process, thereby simplifying the MR / SR process. Therefore, huge facility investment cost can be reduced.

And since the defect which arises in a coating and exposure process can be eliminated, the yield can also be improved. In terms of quality, the wavelength selective transmittance of the color filter prevents the deterioration of the screen due to the difference in focus and the periphery and the center of the screen due to the electron beam, and the flatness of the screen is possible, thereby enabling a high-quality color-brown tube.

Claims (3)

In order to exclude the BM layer coating exposure process and the three-color phosphor coating process in applying the fluorescent surface to the inner surface of the color CRT panel, the white light emitting phosphor coated with the RG B phosphor particles evenly mixed on the fluorescent surface and the outer surface of the panel A color-brown tube comprising a color filter consisting of a BM layer, an R transmission layer, a G transmission layer, and a B transmission layer. According to claim 1, The wavelength characteristics of the light emitted by the white light emitting phosphor is 780mm, 554mm, 480mm color peak tube characterized in that the combination of a white light emitting phosphor made of a material having three peak value wavelength characteristics for this purpose . 2. The color-brown tube according to claim 1, wherein a white light-emitting phosphor is applied in a single layer.