KR19980067486A - Phosphor emission embossing structure of color cathode ray tube - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color cathode ray tube, wherein the phosphor emission embossing of a color cathode ray tube is performed by embossing a phosphor emitting position on an inner surface of a panel glass, thereby increasing the luminance of the screen and improving luminance.

The present invention improves the brightness of the most important of the image characteristics of the color cathode ray tube, and maintains the purity margin, geomagnetic margin and contrast equivalent to that of the conventional color cathode ray tube to maximize the emission area of the red, blue, and green phosphors on the screen. 1.58x magnification increases brightness approximately 1.5x proportionally.

Description

Phosphor emission embossing structure of color cathode ray tube

1 is a structural diagram of a color cathode ray tube.

2 is a cross-sectional view of a conventional screen.

3 is a conventional screen stereoscopic view.

4 is an enlarged view of part A of FIG.

5 is a cross-sectional view of the screen of the present invention.

6 is a screen stereoscopic view of the present invention.

7 is an enlarged view of a portion A of FIG. 6.

8 shows various shapes of embossing.

FIG. 9 is an explanatory diagram when the embossing width A and the bM width a correspond to each other in type A of FIG. 8; FIG.

Explanation of symbols on the main parts of the drawings

1: Panel 2: Funnel

2a: neck 3: electron beam

4: electron gun 5: deflection yoke

6: shadow mask 7: frame

8: inner shield 9: black matrix (BM)

10 phosphor dot 11 phosphor

12: black matrix (BM) 111: phosphor

112: black matrix (BM)

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color cathode ray tube, and to a phosphor emitting embossing of a color cathode ray tube, characterized in that the light emitting area of the screen is increased by having an embossing at the phosphor emitting position on the inner surface of the panel glass to improve luminance.

The prior art is described as follows.

The color cathode ray tube has a funnel 2 having a panel 1 coated with a phosphor which is emitted by an electron beam 3 and a neck portion 2a enclosed with an electron gun 4 for generating a battery beam as shown in FIG. The fused and electron beam emitted from the electron gun 4 passes through the slots of the shadow mask supported by the frame, and color screening is performed to emit an image of red, green, and blue phosphors formed on the inner surface of the panel. The screen on which the phosphor emits light has a black matrix made of graphite formed on the inner surface of the panel to improve contrast by exposure method, and red, blue, and green phosphor stripes are formed on it. The vaporized light reflects the secondary electrons generated after the collision with the phosphor and the light emitted backward, and is reflected to the front portion of the color cathode ray tube.

The conventional color cathode ray tube is excellent in contrast due to the application of black matrix and dark tint glass for contrast enhancement, but has a problem of lowering luminance, which is the most important characteristic of the color cathode ray tube.

In addition, when the BM width, which is the phosphor emission area, is widened to improve luminance, contrast decreases, purity margins, and geomagnetic margins are small, resulting in a reduction in work margin during manufacturing and deterioration of screen quality.

In view of the above, the present invention is characterized in that the light emitting area of the screen is increased by embossing the phosphor emitting position of the inner surface of the panel glass, thereby improving luminance.

As shown in FIG. 3, the inner surface of the panel glass of the color cathode ray tube is embossed between the phosphor 111 light emitting positions, that is, the non-empty 112, thereby widening the phosphor light emitting area. As shown in FIG. 2, in the case of the type A of FIG. 4, the diameter A of the embossing should be smaller than the bM width a and larger than the average particle diameter of the phosphor.

The reason for this is that if the diameter A of the embossing is equal to the bM width a, the light emitting portion formation position is the same as that of the conventional light emitting area as shown in Fig. 5, so that the luminance improvement cannot be expected.

The pitch between embossing shall be equal to the horizontal and vertical pitch of the screen.

The reason for this is that the center of the embossing is different from the center of the non-Amdot mirror and the amount of light emitted for each dot causes difficulty in maintaining a uniform white distribution of the screen.

The depth B of the embossing should be smaller than the biem width / 2 and larger than the average particle diameter of the phosphor.

The present invention is applicable to both the stripe type and the dot type so that the vertical pitch of the embossing in the stripe type should be equal to the pitch of the emitted electron beam, and the vertical diameter of the embossing should be equal to or smaller than the vertical diameter of the electron beam.

In the color cathode ray tube of the present invention, color separation is performed while the electron beam radiated from the electron gun 4 passes through the slot of the shadow mask supported by the frame, and each of the selected red, blue, and green electron beams passes through the aluminum deposition film to the inner surface. It collides with the red, green, and blue phosphor patterns formed on the panel having the embossing to emit light. At this time, the emission area is increased by up to 1.57 times to obtain an image.

In another embodiment of the present invention, the inner surface of the panel glass is embossed at equal intervals to widen the phosphor emission area. The shape of the embossing should be smaller than the depth (B) and the bM width of the embossing and larger than the average particle diameter of the phosphor. This is applicable to both the stripe type and the dot type.

Referring to the effects of the present invention as follows.

The present invention improves the brightness of the most important of the color characteristics of the color cathode ray tube and maintains the purity margin, geomagnetic margin and contrast equivalent to that of the conventional color cathode ray tube. Up to 1.58x magnification increases the brightness approximately 1.5x proportionally.

Claims (3)

A phosphor emitting embossing structure of a color cathode ray tube, characterized in that the phosphor emitting area is widened by embossing the phosphor emitting position on the inner surface of the color cathode ray tube panel glass. The method of claim 1, A hollow body light emitting embossing structure of a color cathode ray tube, characterized in that the inner surface of the panel is smaller than the bM width (a) of the diameter (A) of the embossing and larger than the average particle diameter of the phosphor. The method of claim 1, The pitch between embossing is the same as the horizontal and vertical pitch of the screen and the depth (A) of the embossing is less than the emem width x ½ and larger than the average particle diameter of the phosphor, the light emitting embossing structure of the color cathode ray tube.