JPS6298555A - Light emitting display device - Google Patents

Abstract

PURPOSE:To prevent leakage of light from the wall surface of a container, and eliminate the color mixture and decrease in contrast of light by covering the wall surface of glass container except for the light emitting surface with light shielding material. CONSTITUTION:A light shielding material 6 shields light leaked from the whole wall surface of a vacuum glass container 1 except for the light emitting surface 1a of a light emitting display device. The light shielding material 6 is formed by applying opaque or colored paint to the outer or inner side of the wall surface of the glass container 1. Or, the wall itself of the container is colored. Thereby, the light emitted from phosphor 4 is shielded with the light shielding material and the light is emitted only from the light emitting surface 1a. This invention is applied to the light emitting device of an electron-ray indicator tube type of a gas-sealed discharge tube type. In addition, a plastic container instead of a glass container can be used.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a light emitting display element used in a display device.

[Conventional technology]

FIG. 2 shows a cathode ray display element as an example of a conventional light emitting display element. In the figure, (1) is a transparent vacuum glass container that serves as an arc tube, (2) is a filament that emits a cathode ray electron beam, (8) is a grid that controls the amount of cathode ray electron beam emission, and (4) is a plate that goes up. The light emitting display element configured in this way has a grid (8)
The cathode ray electron beam from the filament (2), whose emission amount is controlled by, hits the phosphor (4) at high speed and emits light.
The light is emitted from the light emitting surface (1a).

[Problem that the invention seeks to solve]

Since the conventional light emitting display element is configured as described above, the light emitted from the phosphor (4) is emitted from the wall surface of the glass container (1) in addition to the light emitted from the original light emitting surface (1a) (a). ″L
Since light (b) is generated, there are problems such as color mixing of light and a decrease in contrast, which are inconvenient when used in a display device.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to prevent light leakage from the wall surface of a light emitting element and to obtain a light emitting device suitable for use in a display device.

[Means for solving problems]

In the light-emitting display element according to the present invention, the entire opaque wall surface of the glass container other than the light-emitting surface is covered with a colored light-shielding material.

[Effect]

In the light emitting display element of the present invention, by making the wall surface of the container other than the light emitting surface opaque, light leaking from the wall surface is blocked, and color mixing of light and deterioration of contrast are significantly improved.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, symbols (1) to (5) are the same as those of the conventional light emitting display element shown in FIG. (6) A light-shielding material for blocking light leaking from the wall surface of the vacuum glass container (1) other than the light-emitting surface (1a) of the light-emitting display element, and this light-shielding material (6) may be, for example, an opaque or colored paint. The coating is applied to the outer surface of the wall of the glass container (1) from the inner surface. Alternatively, the wall surface of the glass container itself may be colored.

With the above configuration, the light emitted from the phosphor (4) is blocked by the light-shielding material (6) on the wall side of the glass container (1), and does not leak from the original light-emitting surface (1a). can only emit light.

Although the embodiments have been described using a cathode ray display element as an example, a fluorescent display type light emitting display element or a gas-filled discharge tube type may also be used. Furthermore, other than glass containers, plastic containers can also be used.

〔Effect of the invention〕

As explained above, according to the present invention, by covering the entire wall surface of the glass container other than the light-emitting surface with a light-shielding material, leakage of light from the wall surface of the container can be prevented, thereby eliminating color mixing of light and deterioration of contrast. It becomes a light-emitting display element suitable for use in a display device.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a light emitting display element according to an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional light emitting display element. (1)...Vacuum glass container (2)...0 filament (4)...Fluorescent material (6)...
Light-shielding material Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A light emitting display element whose light emitting tube is made of a transparent vacuum glass container, characterized in that the wall surface of the transparent glass container other than the light emitting surface is covered with an opaque or colored light shielding material to block transmitted light.