KR100205415B1 - Color cathode-ray tube - Google Patents

Abstract

The fluorescent surface structure of the color cathode ray tube is provided. In order to solve the problem that the luminance uniformity of the light emitting phosphor width is constant when the distribution of the center and the surroundings of the fluorescent surface is constant, the luminance uniformity is worsened, the luminance uniformity is reduced to 1 at the center of the fluorescent surface. It is designed to improve the luminance uniformity and the white uniformity of the central and peripheral portions of the fluorescent surface by decreasing the / 2 point and increasing the fluorescence surface from the half point of the fluorescent surface to the short axis of the fluorescent surface.

Description

Fluorescent surface structure of colored cathode ray tube

The present invention relates to a color cathode ray tube, and more particularly to a fluorescent surface structure of a color cathode ray tube.

1 is a schematic configuration diagram of a general color cathode ray tube.

Referring to FIG. 1, a general color cathode ray tube is composed of an optical lens 10, a light source 11, a filter 12 for adjusting light generated by the light source 11, and a body part not shown in the drawing. have.

In addition, a fluorescent pixel is formed on the fluorescent surface 13 by using a photographic method. First, a panel 14 coated with a photosensitive material and a shadow mask 15 are bonded to the inner surface of the fluorescent screen 13 to be mounted on the body of the cathode ray tube. When the light source 11 is turned on, photocuring reactions are performed with light passing through hundreds of thousands of unshown openings of the shadow mask 15 and materials applied to the inner surface of the panel 14 to form a fluorescent pixel.

Here, the fluorescent pixel is composed of a graphite band, a red band, a green band, and a blue band, which are continuously configured from the central portion 16 to the short axis 18 of the fluorescent surface 13 as shown in FIG. 2A.

That is, as shown in FIG. 2B, a light emitting type body width having a constant distribution from the center to the periphery of the fluorescent surface is formed by adjusting the intensity of light reaching the center and the periphery of the panel using a filter during exposure.

3A to 3G are cross-sectional views showing a manufacturing process of a fluorescent pixel of a general color cathode ray tube. After the photosensitive agent is applied to the inner surface of the panel 14, the photosensitive agent is exposed to light generated from the light source 11 and the photosensitive agent is exposed to a constant pressure. When water is sprayed and washed, the photosensitive band 19 is formed at a predetermined interval as shown in FIG. 3A.

Subsequently, when graphite is coated and dried on the photosensitive strip 19, the graphite film 20 is formed as shown in FIG. 3B.

Subsequently, when the exposed photosensitive strip 19 is decomposed into a chemical capable of decomposing the exposed photosensitive strip 19, the graphite strip 21 remains on the panel 14 at a predetermined interval as shown in FIG. 3C. This is formed continuously from the central portion 16 of the fluorescent surface 13 to the short axis 18 in FIG. 2A.

Subsequently, after forming the graphite band 21 of FIG. 3c to form the light emitting phosphor film, the phosphor adhesion enhancer 22 is applied as shown in FIG. 3d and the green phosphor solution is applied as shown in FIG. 3e to form the green phosphor film 23. When it is dried, exposed to light, and washed by spraying water at a constant pressure, a green fluorescent film 23, that is, a green fluorescent pixel as shown in FIG. 3F is formed.

Therefore, as shown in FIG. 3G, the red 25 and blue 26 fluorescent pixel manufacturing steps are the same as the green fluorescent pixels manufacturing steps.

The fluorescent surface structure of the color cathode ray tube according to the related art is that the luminance, which is an important characteristic of the color cathode ray tube, decreases from the center of the fluorescent surface toward the periphery, so that the luminance uniformity becomes a problem when the luminance difference between the central portion and the peripheral portion of the fluorescent surface increases. There is a problem that the uniformity is lowered.

In order to solve this problem, when the width of the emitting phosphor increases from the center of the fluorescent surface to the periphery, the electron beam is discolored due to thermal expansion of the shadow mask when driving the color cathode ray tube at the half point between the central part and the short axis of the fluorescent surface. There is a disadvantageous problem in the doming to emit light.

The present invention has been made to solve the above-mentioned problems of the prior art, the object of the present invention is to distribute the light emitting phosphor width is reduced to 1/2 point between the short axis of the central portion of the fluorescent surface and again at 1/2 point It is to provide a fluorescent surface structure of a color cathode ray tube with excellent luminance uniformity and white uniformity with increasing distribution up to short axis.

1 is a schematic configuration diagram of a general color cathode ray tube.

FIG. 2A is a diagram showing a central portion, a domming portion, and a short axis of the fluorescent surface. FIG.

2b is a view showing a light emitting phosphor width distribution curve of a general color cathode ray tube;

3A to 3G are cross-sectional views showing a manufacturing process of a fluorescent pixel of a general color cathode ray tube.

4A to 4G are cross-sectional views showing a manufacturing process of a fluorescent pixel of a color cathode ray tube according to the present invention.

5 is a view showing a light emitting phosphor width distribution curve of a color cathode ray tube according to the present invention.

* Explanation of symbols for main parts of the drawings

10 lens 11: tuber

12 filter 13 fluorescent surface

14 panel 15 shadow mask

16: fluorescent screen center 17: domming

18: short axis

A characteristic of the fluorescent surface structure of the color cathode ray tube according to the present invention is that the distribution of the emitting phosphor has a distribution in which the width of the emitting phosphor decreases from the center of the fluorescent surface to the half point between the short axis in the direction of the short axis and at the half point. Up to the short axis, it has a fluorescent surface structure in which the distribution of the emission phosphor width increases.

Hereinafter, a preferred embodiment of the fluorescent surface structure of the color cathode ray tube according to the present invention will be described with reference to the accompanying drawings.

4A to 4F are sectional views showing the manufacturing process of the fluorescent pixel of the color cathode ray tube according to the present invention, and are the same as the conventional manufacturing process.

However, in FIG. 4G, the light emitting phosphor width decreases from the center of the fluorescent surface to the half point between the short axis and the light emitting phosphor width increases from the half point to the short axis.

5 is a view showing a light emitting phosphor width distribution curve according to the present invention.

Referring to FIG. 5, the fluorescent surface structure of the color cathode ray tube according to the present invention has a distribution in which the light emitting phosphor width decreases from the center of the fluorescent surface to the half point between the short axis in the direction of the short axis axis. From the / 2 point to the short axis, it is composed of a fluorescent surface structure in which the distribution of light emitting phosphor width is increased.

Referring to the operation of the color cathode ray tube according to the present invention configured as described above are as follows.

When the width of the light emitting phosphor of the color cathode ray tube decreases from the center of the fluorescent surface to the half point between the short axis and increases from the half point to the short axis, when the color cathode ray tube is driven, At the 1/2 point between the short axis axes, the electron beam moves due to thermal expansion of the shadow mask, thereby causing a domming phenomenon that emits other colors.

In addition, when the width of the light emitting phosphor at the half point between the center and the short axis of the fluorescent surface is narrowed to such an extent that the white uniformity due to the difference in luminance at the center of the fluorescent surface is not a problem, the graph of the graphite band in the unit pixel is advantageous. The width is increased, which can be effective in preventing dope.

Considering the luminance, which is an important characteristic of the color cathode ray tube, when comparing the center portion of the fluorescent film with the domming portion, the central portion of the fluorescent screen is not affected by the domming, so that the width of the light emitting phosphor may be wider than that of the domming portion, thereby facilitating the luminance.

When the width of the light emitting phosphor decreases from the doming portion to the short axis, the luminance uniformity becomes a problem due to the luminance difference between the central portion of the fluorescent surface and the short axis of the fluorescent surface and the luminance difference. Make sure

If the luminance uniformity of the central portion of the fluorescent surface and the short axis of the fluorescent surface is excellent, the white uniformity is also excellent.

The fluorescent surface structure of the color cathode ray tube according to the present invention has a light emitting phosphor width from the central portion of the fluorescent surface where the electron beam emits the other color due to thermal expansion of the shadow mask during driving of the color cathode ray tube to the half point between the short axis and the short axis. This decrease is advantageous to the doming characteristic, and the light emitting phosphor width is increased from the 1/2 point to the short axis, thereby improving the luminance uniformity and the white uniformity of the central and peripheral portions of the fluorescent screen.

Claims (3)

In the fluorescent screen structure composed of a graphite film and a fluorescent film on the inner surface of the color cathode ray tube, the color cathode ray tube is characterized in that the width of the light emitting phosphor decreases toward the short axis from the central portion of the fluorescent surface to increase the width of the light emitting phosphor. Fluorescent surface structure. 2. The fluorescent screen structure of a color cathode ray tube according to claim 1, wherein the light emitting phosphor width is constituted by a fluorescent surface having a shorter light emitting phosphor width at a shorter axis than a light emitting phosphor width at a central portion of the fluorescent surface. The fluorescent surface of a color cathode ray tube according to claim 1, wherein the width of the light emitting phosphor decreases to about one half of the short axis at the center of the fluorescent surface, and the width of the light emitting phosphor increases from one half to the short axis. rescue.