JPH05173132A - Fluorescent surface luminous body - Google Patents

Abstract

PURPOSE:To uniformly diffuse light which is incident from a light guide plate side end part and to emit visible light which is excellent in visibility outwards perpendicular to a reflecting plate by mixing a fluorescent material in a light guide plate part. CONSTITUTION:This luminous body has a reflecting plate 2, the light guide plate 3 arranged on its top surface, and a light source 1 such as a fluorescent lamp arranged at one side end part of the light guide plate 3. Then the fluorescent material 4 is mixed in the light guide plate 3 to eliminate the need for a dot pattern 7, a diffusion plate 8, etc., unlike before. Light which is made incident from the light source 1 is reflected by the reflecting plate 2 and made incident on the light guide plate 3, and the incident light is diffused by the fluorescent material 4, directed vertically right top surface above the top surface of the reflecting plate 2, and diffused to relatively uniform brightness to reach the eye 6 of an external user as visible light 5 having good visibility.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent surface light emitter, for example, a panel-shaped fluorescent surface light emitter used for a liquid crystal display plate or the like.

[0002]

2. Description of the Related Art A surface light source panel used for a conventional liquid crystal display panel or the like is constructed so that incident light from a light source at a side end portion of the panel is guided by a diffuse reflection or the like into a surface of a light guide plate to be irradiated. , Is relatively bright at the position near the side edge light source,
It is difficult to effectively guide the incident light at a position away from this, and thus it is difficult to obtain a surface light source panel having uniform brightness. Various proposals for improvement have been made in order to solve this problem, but none of them is unavoidable.

FIG. 2 is a schematic sectional view showing an example of a conventional surface light source panel of this type. Reference numeral 1 is a light source such as a fluorescent lamp disposed at a side end portion of the panel, 2 is a reflection plate, 3 is a light guide plate, 7 is a dot pattern formed on the surface of the reflection plate 2 by printing, and 8 is diffusion. A plate, 5 represents the visible light entering the eyes 6 of the user. Light incident on the panel from the edge light source 1 is reflected by the reflection plate 2, diffusely reflected by the dot pattern 7 on the surface thereof, and is directed in the light guide plate 3 in the vertical direction of the reflection plate 2 to the diffusion plate 8. The light that has entered and entered in the shape of the dot pattern 7 is radiated to the outside as visible light 5 of diffused light and enters the eyes 6 of the user. If you look at this panel without the diffuser plate 8, the dot pattern 7
Since the light can be seen in the shape of, the diffusion plate 8 is required.

[0004]

As described above, it is difficult to evenly guide the incident light from the end light source 1 to the entire surface of the panel, and it is possible to see these lights to the outside with good visibility. In order to radiate in the form, dot pattern 7 on reflector 2
Formation and diffusion plate 8 were required. The present invention has been made in view of the above situation, and has a good light guiding function and good external visibility without using the dot pattern 7 on the reflection plate 2 or the diffusion plate 8 as described above. The purpose of the invention is to provide a surface light source panel configuration.

[0005]

For this reason, in the present invention, the fluorescent surface light-emitting body is configured such that light is made incident on the light guide plate portion from the light source at the side end portion of the light guide plate portion on the reflection plate, and the reflection is performed. A panel-shaped surface light-emitting body for radiating visible light to the outside of the plate in the vertical direction is configured to mix a fluorescent substance inside the light guide plate section, thereby achieving the above object. Is.

[0006]

With the above-described structure, the fluorescent surface light emitter according to the present invention is relatively uniform and has a high visibility without the use of the dot pattern, diffuser plate, etc., which were required for the conventional surface light source panel. Good visible light can be output to the outside.

[0007]

EXAMPLES The present invention will be described below based on examples. FIG. 1 shows a schematic cross-sectional configuration diagram (corresponding to FIG. 2) of an embodiment of the phosphor surface light-emitting body according to the present invention. Reference numeral 2 is a reflection plate, 3 is a light guide plate disposed on the upper surface thereof, and 1 is a light source such as a fluorescent lamp disposed at one end of the light guide plate 3. The feature of the present invention resides in that the fluorescent material 4 is mixed inside the light guide plate 3, and the dot pattern 7, the diffusion plate 8 and the like are not required as in the conventional example.

Light incident from the light source 1 is reflected by the reflection plate 2 and enters the light guide plate 3, and this incident light is diffused by the fluorescent substance 4 and directed toward the vertical upper surface of the reflection plate.
The visible light 5 is diffused to a relatively uniform brightness and reaches the external user's eye 6 as visible light 5 having good visibility.

[0009]

As described above, according to the present invention, due to the presence of the fluorescent substance mixed in the inside of the light guide plate, the light incident from the end portion on the light guide plate side is uniformly diffused, and the light of the reflection plate is Visible light with good visibility can be emitted to the outside in the vertical direction.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional configuration diagram of an embodiment of a fluorescent surface light emitter.

FIG. 2 is a schematic sectional configuration diagram of an example of a conventional surface light source panel.

[Explanation of symbols]

 1 Light Source 2 Reflector 3 Light Guide 4 Fluorescent Material 5 Visible Light 6 Eyes

Claims (1)

[Claims] 1. A panel-shaped surface for allowing light to enter the light guide plate from a light source at a side end of the light guide plate on the reflector and to radiate visible light to the outside of the reflector in the vertical direction. A fluorescent surface light-emitting body, which is a light-emitting body, in which a fluorescent substance is mixed inside the light guide plate.