KR200160141Y1 - Panel of cathode ray tube - Google Patents

Abstract

The present invention relates to a black coated cathode ray tube panel which can significantly improve characteristics such as brightness and contrast by forming a predetermined coating layer on a panel where a pixel is formed in a colored cathode ray tube.

The present invention is a cathode ray tube of a vacuum bulb structure in which a panel 10 and a funnel 11 are bonded to each other: a black coating layer 20 coated with a predetermined black pigment on an outer surface and / or an inner surface of the panel 10. The central portion of the panel provides a relatively black coating that forms a relatively thick black coating layer and flows toward the periphery.

As a result, the center of the panel and the periphery of the panel maintain uniform brightness, the contrast is corrected as a color filter for the R, G, and B phosphors, and the reflection of the panel surface caused by external light is also reduced. It is effective to improve.

Description

Black Coated Cathode Ray Panel

1 is a schematic partial cross-sectional view of a color cathode ray tube.

2 is a cross-sectional view of a panel showing a black coating state according to the present invention.

3 is a front view of a panel showing a black coating state according to the present invention.

<Description of the symbols for the main parts of the drawings>

10 panel 11 funnel

12 shadow shadow assembly 13 electron gun assembly

14 black coating layer 15 phosphor

16: Al film 20: Black coating layer (this invention)

20a: square pattern 20b: circular pattern

D: dense distribution phase L: small distribution phase

The present invention relates to a color receiver tube (or cathode ray tube), and in particular, a black coated cathode ray tube capable of remarkably improving characteristics such as brightness and contrast by forming a predetermined coating layer on a panel where a pixel is formed in a color cathode ray tube. It is about the panel.

In general, as shown in FIG. 1, the cathode ray tube has a constant distance between the shadow mask assembly 12 and the rear of the panel 10 in a vacuum bulb structure in which the panel 10 and the funnel 11 are bonded to each other. And the electron gun assembly 13 is mounted to the neck portion of the funnel 11.

A fluorescent surface is formed on the inner surface of the panel 10. The electron beam emitted from the electron gun assembly 13 is focused and accelerated by various lens systems and greatly accelerated by the high voltage applied through the anode. When deflected by a deflection yoke (not shown) installed externally and sequentially passed through a fine aperture or slot formed in the shadow mask assembly 12 and scanned on a fluorescent surface, it collides with a phosphor composed of R, G, and B to be compounded. A pixel having a predetermined color is formed.

In such a cathode ray tube, the angle at which the electron beam is scanned on the fluorescent surface of the panel 10 is changed over the entire surface of the fluorescent surface. When the electron beam passes through the central portion of the fluorescent surface, the electron beam is scanned at a right angle and severely inclined when passing through the periphery of the fluorescent surface. Accordingly, the peripheral portion of the fluorescent surface has a structural problem that the luminance is lowered because there are fewer electron beams incident or collided than the central portion.

In particular, in the case of a large-scale water tube according to the recent trend of product enlargement and enlargement, the above problem becomes more serious and becomes an important problem, and the brightness of pixels due to unnecessary light emission or external light caused by scattered electrons generated in the electron beam scanning As the contrast ratio of the dark part becomes unclear, the problem that the overall contrast deteriorates must also be solved. In particular, there is a problem that the luminance is high in the central portion and the luminance is greatly decreased in the peripheral portion, resulting in non-uniformity throughout the screen, and greatly reducing the concrete characteristics.

Accordingly, the present invention provides a black coated cathode ray tube panel that can form a predetermined coating layer on the panel where the pixels formed of phosphors composed of R, G, and B are formed in the color cathode ray tube to make the luminance uniform and improve the contrast characteristics. The purpose is to provide.

In order to achieve the above object, the present invention provides a cathode ray tube of a vacuum bulb structure in which a panel 10 and a funnel 11 are bonded to each other: a predetermined black pigment on an outer surface and / or an inner surface of the panel 10. It provides a black coated cathode ray tube panel, characterized in that the black coating layer 20 is coated.

At this time, the black pigment forming the black coating layer 20 becomes a small distribution phase (L) in a dense distribution phase (D) while going from the center portion of the panel 10 to the periphery, as a whole, a rectangular pattern 20a or a circular pattern 20b. It is coated in the shape of.

Hereinafter, the present invention will be described in detail preferred embodiments based on the accompanying drawings.

2 is a cross-sectional view of a panel showing a black coating state according to the present invention.

First, the process of generating the fluorescent surface of the color receiving tube by the wet slurry method is applied to the inner surface of the glass panel 10 by applying a photosensitive resin (resist) cured by ultraviolet rays, drying, and then exposed to light. The black coating layer 14 of a predetermined arrangement structure is completed on the photoadhesive film, and a predetermined amount of pigment-adhered red, green, and blue phosphors 15 are sequentially applied on the black coating layer 14, and then dried using a high pressure mercury lamp or the like. After the exposure is completed, the fluorescent surface is formed, and an organic resin film is formed on the fluorescent surface to prevent loss of the particles of the phosphor 15 and to improve the specularity of Al. ) And Al film 16 for forwarding the light emitted to the rear of the panel 10 after the collision.

At this time, the outer surface of the panel 10 to form a black coating layer 20 of the anti-reflective black pigment to reduce the reflectance of the panel 10 itself, at the same time to uniform brightness and to improve the contrast. Black pigments are applied to the thickness of tens to hundreds of microns using fine particles with appropriate particle size. If the particle diameter is too small (e.g. less than 100 microns), the antireflection function is weakened and if the diameter is too large (e.g. more than thousands of microns ) The overall brightness and resolution are significantly degraded. The black coating layer 20 may be further formed on the inner surface of the panel 10. In this case, since the black pigment absorbs the light emitted from the phosphor itself, it is preferable to further reduce the particle size and the coating thickness of the black pigment than when it is applied to the outer surface of the panel 10.

3 is a front view of a panel showing a black coating state according to the present invention.

The black pigment forming the black coating layer 20 is not uniformly applied on the panel 10, but is coated in a small distribution phase (L) in a dense distribution phase (D) while going from the center portion of the panel 10 to the periphery. However, in order to facilitate the technical or economical aspect, it is possible to continuously change the density from the dense distribution phase D to the small distribution phase L in the actual process, so that the rectangular pattern 20a of FIG. 3a or the circular pattern 20b of FIG. 3b is illustrated. It is also possible to coat to have a plurality of discontinuous density distribution, such as the shape of).

It is also possible to form the black coating layer 20 on the panel before forming the above-described fluorescent surface and to form the fluorescent surface on the black coating layer 20.

Moreover, when apply | coating to a front surface of a panel, it can also function as an antistatic film by mixing and forming the electroconductive metal oxide fine particle in the black coating layer 20.

As described above, the central part of the panel maintains a uniform brightness by forming a relatively dark black coating layer and blurring toward the periphery of the panel, and maintaining the uniform brightness at the center and the periphery of the panel, and serving as a color filter for R, G, and B phosphors. It has the effect of improving the characteristics of the color receiving tube by correcting the contrast and reducing the reflection of the panel surface by external light.

Although the present invention has been illustrated and described with reference to certain preferred embodiments, the present invention may be variously modified and changed without departing from the spirit or the field of the present invention provided by the following utility model registration claims. It will be readily apparent to one of ordinary skill in the art that it can be used.

Claims (2)

In a cathode ray tube having a vacuum bulb structure in which a panel 10 and a funnel 11 are bonded, a black coating layer 20 having a predetermined black pigment coated thereon is formed on an outer surface and / or an inner surface of the panel 10. Black-coated cathode ray panel, characterized in that. According to claim 1, wherein the black pigment forming the black coating layer 20 goes from the center portion of the panel 10 to the periphery of the dense distribution phase (D) to the small distribution phase (L), the dense and minor distribution phase (D, Black coated cathode ray tube panel, characterized in that L) is coated in the shape of a square pattern (20a) or a circular pattern (20b) as a whole.