JPH02187744A - Fluorescent screen - Google Patents

Abstract

PURPOSE:To completely prevent fluorescence from leaking into an adjacent rod and to enhance fluorescence projecting efficiency by constituting screen plate of the aggregate of rods containing a light emission substance and making the respective rods contain colored clad. CONSTITUTION:The screen plate 3 is constituted of the aggregate of the plastic rods consisting of a plastic core 1 containing a phosphor and the clad 2 surrounding the outer circumference of the core 1. In the plate 3, each core 1 corresponds to a picture element and exciting light is radiated as a light spot by a two-dimensional scanning. A metallic reflecting film, a diffused reflection layer or a colored layer including a black layer is used as the clad 2. As a result, a screen whose fluorescence projecting efficiency is high is obtained.

Description

TECHNICAL FIELD The present invention relates to phosphor screens, and more particularly to phosphor screens having a screen plate containing a substance that emits light in response to excitation light.

Background Art A screen plate containing a substance (so-called phosphor) that emits fluorescence or phosphorescence in response to excitation light such as ultraviolet light, visible light, near-infrared light, etc., such as piperidium tetra(benzoyltrifluoroacetone) europium complex. There is a display that forms a phosphor screen and displays an image by projecting the excitation light onto this screen plate.

In such displays, conventionally, a screen plate made of an aggregate of plastic rods containing phosphor, as shown in FIG. 3, has been used. However, with this type of screen plate, as shown in Figure 4, excitation light incident obliquely leaks into adjacent rods, causing crosstalk.
There was a drawback that fluorescence generated within the rod leaked into adjacent rods, causing crosstalk and bleeding.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks of the conventional methods, and completely prevents excitation light and generated fluorescence from leaking into adjacent rods, thereby improving the efficiency of excitation light utilization. Another object of the present invention is to provide a phosphor screen with no crosstalk and high fluorescence emission efficiency.

In the phosphor screen according to the present invention, the screen plate is constituted by an aggregate of rods containing a substance that emits light in response to excitation light, and each rod includes a core containing the substance and a colored cladding that covers the outer periphery of the core. It is composed of.

Example Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 is a partial front view showing one embodiment of the present invention. In the figure, a screen plate 3 is constituted by an assembly of plastic rods consisting of a plastic core 1 containing phosphor and a clad 2 provided so as to surround the outer periphery of this core 1. In this screen plate 3, each core 1 corresponds to a pixel, and excitation light such as ultraviolet rays is irradiated as a light spot by two-dimensional scanning. As the cladding 2 covering the outer periphery of the core 1, a metallic reflective film or a colored layer including a white layer (diffuse reflective layer) or a black layer is used.

By constructing the screen plate 3 by an assembly of plastic rods made of the core 1 having the colored cladding 2 on the outer periphery, as shown in FIG. This makes it possible to completely prevent the excitation light from being used, thereby increasing the amount of fluorescence as well as emitting it only from its own rod, so there is no crosstalk and a screen with high fluorescence emission efficiency can be obtained. In particular, the contrast can be improved by making the colored cladding 2 a dark layer such as a black layer, or by masking the portion of the core 1 other than the end face with a dark color such as black in a manner that hides the cladding 2 at the fluorescent emission site. It will also be possible to improve the results.

Although Fig. 2 shows the case where it is applied to rear projection, in the case of front projection,
By providing a cladding not only on the outer periphery of the core 1 but also on the bottom surface of the core 1 where excitation light does not enter, brighter projection can be achieved.

As described in detail, in the phosphor screen according to the present invention, the screen plate is constituted by an assembly of rods containing a substance that emits light in response to excitation light, and each rod has a core containing the substance. The structure is made up of a colored cladding that covers the outer periphery of this core, and the action of the colored cladding completely prevents excitation light and generated fluorescence from leaking into adjacent rods, increasing the efficiency of excitation light utilization and the amount of fluorescence. In addition to increasing the amount of fluorescent light, there is no crosstalk and the fluorescence emission efficiency can also be improved.

[Brief explanation of the drawing]

FIG. 1 is a partial front view showing an embodiment of the present invention, FIG. 2 is a schematic perspective view for explaining the present invention in detail, FIG. 3 is a partial front view showing a conventional example, and FIG. 4 is a conventional example. FIG. Explanation of symbols for main parts 1...Core 2...6-color cladding 3...Screen plate Applicant: Pioneer Corporation 11゜

Claims (3)

[Claims] (1) A phosphor screen having a screen plate consisting of an assembly of rods containing a substance that emits light in response to excitation light, the rods including a core containing the substance and surrounding the outer periphery of this core. A phosphor screen characterized by comprising a colored cladding provided in such a manner as to (2) The phosphor screen according to claim 1, wherein the colored cladding comprises a dark layer. (3) The phosphor screen according to claim 1, wherein a portion of the screen plate other than an end surface of the core is dark-colored.