JPH05325839A - Nonreflective screen of electric display - Google Patents

Abstract

PURPOSE:To provide a screen on which no glare is caused by reflection of light from the outside by transferring an image projected inside the screen onto the dull surface of the screen by means of the optical waveguides of glass fibers. CONSTITUTION:Phosphor 2 is provided on one side of a rectangular glass fiber having the form and size of one phosphor 2 in a screen and a dull surface is provided on the opposite side. Thin film bodies made of silver or aluminium are provided on the other four sides to form one optical waveguide 1. A plurality of optical waveguides 1 are held together by light-blocking resin 3 to form the screen. Light from phosphor 2 is totally reflected at the thin film bodies within the glass fiber and reaches the dull surface, providing the same emission as phosphor 2. Since the screen surface is dull, an image plane on which light from the outside is not projected can be obtained. The screen, whose resolution is not degraded and which does not cause the glare of reflection of light from the outside is thus provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention prevents external light such as room lighting fixtures and window lights from being reflected on a screen surface of a television or the like, and the screen surface of the flat type or The present invention relates to a screen of an electric display that can be formed into a freely curved surface such as a concave type and that can have a viewing angle of a liquid crystal display as wide as a cathode ray tube.

[0002]

2. Description of the Related Art Conventional electric indicators such as cathode ray tubes are
The screen surface was made of transparent, shining glass or plastic, and it was inevitable that room window lights and lighting fixtures would be reflected on the screen surface. Recently, there is also what is called non-glare coating, and it has been attempted to soften the reflection to some extent by making the screen surface slightly matte. However, the matte intensity and the resolution in the image are in inverse proportion to each other, and if the matte intensity is increased in order to eliminate the glare, the image becomes more and more blurred, and it is impossible to almost eliminate the glare. It was possible. In addition, the screen surface of the cathode ray tube is limited to a convex type because of its structure, and the image may appear distorted depending on the angle of the line of sight. In addition, the liquid crystal display has a narrow viewing angle so that an image can be viewed correctly, which is inconvenient.

[0003]

Recently, television screens have become large in size, and the large amount of light outside the room or the light from the room reflected on the screen surface is particularly noticeable to people who watch television during the daytime, such as on holidays. It is very hard for me to see. Also, as the screen becomes larger, the distortion of the image will also feel larger due to the convex shape of the surface. Furthermore, with a liquid crystal screen, the viewing angle is narrow, and it is impossible to view the image vertically and horizontally. Anyone who watches television wants to remedy these shortcomings. The present invention eliminates these drawbacks and answers the needs of people.

[0004]

The screen of a conventional cathode ray tube or liquid crystal display device is made of transparent glass or resin, and its surface is naturally glossy, and a bright background outside the screen is reflected therein. Therefore, if the smooth and glossy surface is removed and the surface is made to have a frosted glass-like matte surface, the background reflection is eliminated. But,
Then, the resolution of the screen will drop and the image will not be displayed correctly. That is, there is an inverse relationship between the background reflection prevention and the resolution. Here, if it is a color cathode-ray tube, if the screen glass has no thickness and the phosphor mosaic on the inner surface of the screen is in close contact with the matte surface, then the phosphor mosaic's emission state remains the same as the matte screen surface. Since it will be transferred to, the screen will not lose the resolution of the screen and the screen will not show the background. However, in reality, there is no glass with no thickness. Therefore, it suffices if it is possible to technically make what looks like and has a function equivalent to that the two are in close contact. Here, the configuration of this equivalent function is a color cathode ray tube (slit type shadow mask)
Will be described with reference to the drawings. (B) A rectangular glass fiber having the shape and size of each phosphor inside the screen is attached to one surface of the glass fiber, and the corresponding surface is made into a matte surface. (B) Silver or aluminum or the like is vacuum-deposited on the other four surfaces to form a thin film body, and one optical waveguide as shown in FIG. 2 is obtained. (C) As shown in FIG. 1, this optical waveguide is solidified with a light-shielding resin or the like to obtain a screen of a cathode ray tube. Needless to say, the resin portion on the screen surface must be matte like the surface of the optical waveguide as shown in FIG. The screen thus obtained constitutes a color CRT as shown in FIG.

[0005]

[Operation] Next, the operation of the present invention will be described. For example, in the case of a color cathode-ray tube having the screen of the present invention, the three electron beams modulated by the RGB signals from the three electron guns are deflected and cross the shadow mask while crossing the shadow mask to emit light to the respective RGB phosphors. The light hits the matte surface of the screen surface while being totally reflected by the thin film inside the glass fiber, and the matte surface emits the same light as the phosphor. In this way, the light emitting state of the phosphor is completely copied to the matte surface, which is the end of all the optical waveguides, so that an image can be displayed on the matte screen surface without lowering the resolution. The matte surface of the screen means that an image screen can be obtained in which external light, such as a window or a light source for illumination, is not reflected. Further, since these actions are not affected by the length of the optical waveguide, it is possible to make the screen surface flat or concave by adjusting the individual lengths.

[0006]

Embodiments Up to now, the color CRT has been mainly described, but the same applies to a liquid crystal display device (backlight type). That is, the phosphor mosaic portion of the cathode ray tube may be replaced with liquid crystal pixels. (However,
Since light is not deflected inside the optical waveguide, a deflection filter must be provided before the light passes through the optical waveguide. )
Then, the information of the light from the pixel is transmitted to the screen surface like the cathode ray tube. In addition, as shown in FIG. 2, one of the phosphor mosaics has been associated with one of the optical waveguides. However, if the fiber optical fiber is thin enough for the size of one phosphor, a plurality of optical fibers can be used. It can also be supported by optical fiber. In this case, if a graded type optical fiber or a single type optical fiber is used, the thin film body on the outer peripheral surface is unnecessary. Further, in order to make the surface of the screen matte, a matte thin film may be attached, applied, or rubbed.

[0007]

As described above, since the surface of the screen of the cathode ray tube or the liquid crystal display device configured as described above has a matte surface, the light of the window of the room or the light source of the lighting equipment is not reflected in it. .. In addition, the surface of the screen can be made flat so that it is easy to see, or it can be made concave like the wide screen of a movie theater, and free curved surfaces can be created. Further, in the liquid crystal display device, since the light of the image by the pixels is transferred to the screen surface, the narrow viewing angle peculiar to the liquid crystal display device is improved.

[Brief description of drawings]

FIG. 1 is an enlarged perspective view of a part (in a circle) of a screen according to the present invention of the color CRT shown in FIG. 4, as viewed from the inside of the CRT.

[Figure 2] One enlarged view of the optical waveguide

FIG. 3 is an enlarged perspective view of a part (in a circle) of the screen according to the present invention of the color cathode ray tube of FIG. 4 as seen from the outside of the cathode ray tube.

FIG. 4 is a perspective view in which a part of the screen of the color CRT according to the present invention is cut away.

[Explanation of symbols] is an optical waveguide, a phosphor, a light-shielding resin, a glass fiber, a thin film body, a matte surface, a screen, a shadow mask, an electron gun

Claims (3)

[Claims] 1. A screen for an electric display, which is configured by using an optical waveguide such as glass fiber in a screen portion for displaying an image of a cathode ray tube or a liquid crystal display device. 2. The screen of the electric display according to claim 1, wherein the surface of the screen of the electric display is matte to eliminate reflection glare of external light. 3. The screen of an electric display according to claim 1, wherein the outer peripheral surface of an optical waveguide such as a glass fiber is formed by thin film vapor deposition of silver or aluminum.