JPH10255699A - Light emitting device and thin lighting system using thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light emitting device with no emission of ultraviolet ray and little heating which is suitable for a light source for thin display device, or a thin lighting system using this light emitting device. SOLUTION: A vacuum sealed body 1 is formed of two glass plates 2, 3 and side plates 4, and the glass bases 2, 3 are arranged opposite to each other with a prescribed space through the side plates 4. Denoted at 5 is a field emission type electron emitting source formed on the glass base 2, and 6 is a phosphor excited to emit light by the electron emitted from the electron emitting source 3, which is formed on the glass base 3 through a transparent conductive film 7. Denoted at 8 is a reflecting film consisting of a metal evaporated film, which is formed on the flat surface and three side surfaces except one side surface 4a of both the glass bases 2, 3. The transparent conductive film 7 constitutes an anode.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting device using a field emission type electron emission source and a thin lighting device using the light emitting device.

[0002]

2. Description of the Related Art A flat light source or a linear light source is preferable as a light source such as a thin luminaire, a display device, or a backlight of a liquid crystal display device, and various light sources have been developed. For example, in a flat display device, a so-called edge light in which an acrylic plate is used as a light guide plate of light and a thin tube fluorescent lamp (cold cathode fluorescent lamp) is arranged on an end surface (edge) of the light guide plate has been put to practical use. ing.

[0003]

However, a fluorescent lamp, which is one of the light sources generally used, emits ultraviolet light together with visible light, and also serves as a heat source. Ultraviolet rays may cause deterioration, such as fading, denaturation, and alteration of the irradiated object, and may damage photographs, paintings, and the like as the irradiated object. In addition, the generated heat promotes this. In order to prevent these problems, it is necessary to mount a filter for preventing transmission of ultraviolet light, a heat absorption filter, and the like on the front of the light source.

In order to reduce the thickness of a display device or the like, a light source having a small tube diameter must be used.
Light output is limited. In particular, when the thickness of the display device is smaller than the diameter of the arc tube, an optical system light guide plate for condensing output light from the arc tube is required.

[0005] As described above, the current light source has not been satisfactory as a light source for a thin lighting device, a display device, or the like.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a light emitting device suitable for a light source such as a thin display device which does not emit ultraviolet light and generates less heat. Or a thin illuminating device using the light emitting device.

[0007]

In order to solve the above-mentioned problems, the invention according to the first aspect of the present invention is directed to a method in which two oppositely arranged predetermined intervals are provided.
A field emission type electron emission source is formed on one of the insulating substrates (eg, a glass substrate), and a light emitting material (eg, a phosphor) which is excited and emitted by electrons emitted from the electron emission source is formed on the other substrate. Wherein the light output from the luminescent material is extracted from an end face side.

According to a second aspect of the present invention, a light guide is provided on the end face side, and the third aspect of the present invention provides an insulating substrate on which the luminescent material is formed having a light transmitting property. And light is extracted from the end face of the light-transmitting substrate. The invention according to claim 4 is characterized in that the light-transmitting substrate extends outward from the end face to form a light guide. Features. Furthermore, the invention described in claim 5 is a thin lighting device using the light emitting device according to the present invention as a light source.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) FIG. 1 is a schematic view showing a first embodiment of a light emitting device according to the present invention. In the figure, reference numeral 1 denotes a thin plate-shaped vacuum sealing body, and the vacuum sealing body 1 is composed of two glass substrates 2, 3 and a side plate 4, and the glass substrates 2, 3 are side plates 4
Are arranged facing each other at a predetermined interval. Reference numeral 5 denotes a field emission type electron emission source formed on one glass substrate 2, and 6 denotes a phosphor as a light emitting substance excited and emitted by electrons emitted from the electron emission source 3, and the other glass substrate 3 It is formed thereon with a transparent conductive film 7 interposed therebetween. Reference numeral 8 denotes a reflection film made of a metal (for example, aluminum) vapor-deposited film, which is formed on the flat surfaces of the glass substrates 2 and 3 and the three side surfaces except one side surface 4a. In addition, the field emission type electron emission source 5 is formed in a planar shape with a large number of minute cathode arrays formed by using a thin film fine processing technique. Further, the transparent conductive film 7 forms an anode.

In the light emitting device thus configured,
Electrons e emitted from the field emission type electron emission source 5 collide with the planar phosphor 6, and the collision excites the phosphor 6 to emit light. Then, the light is output as visible light hv to the outside from the side surface 4a where the reflective film 8 is not formed, while repeatedly diffusing and reflecting in the vacuum space inside the vacuum sealing body 1.

(Embodiment 2) FIG. 2 is a schematic view showing a second embodiment of the light emitting device according to the present invention. The difference from Embodiment 1 is that the light emitting device is formed on the glass substrate 3 on the side of the phosphor 6. Since the reflection film 8 is formed on the outside of the glass substrate 3 and the other configuration is the same as that of the first embodiment, the description is omitted by attaching the same reference numerals to the same parts.

With such a configuration, the phosphor 6
The light hν converted into visible light is transmitted not only in the vacuum space of the vacuum sealing body 1 but also in the glass substrate 3 and is output to the outside from the end face 3 a of the glass substrate 3 on which the reflective film 8 is not formed. Is done.

(Embodiment 3) FIG. 3 is a schematic view showing a third embodiment of a light emitting device according to the present invention. The difference from Embodiment 2 is that the side surface 4a on which the reflection film 8 is not formed is provided.
And a light guide 9 made of a transparent material as a guide for extracting light to the outside.
Therefore, the same parts are denoted by the same reference numerals and description thereof will be omitted.

By providing the light guide 9 as described above,
A light-emitting device in which light can be easily extracted to the outside can be provided.

(Embodiment 4) FIG. 4 is a schematic view showing a light emitting device according to a fourth embodiment of the present invention. The difference from Embodiment 2 is that the glass substrate 3 on the side where the phosphor 6 is formed is provided.
Is extended to the outside of the vacuum sealing body 1 to form the light guide 10, and the other configuration is the same as that of the second embodiment.

(Embodiment 5) FIG. 5 is a schematic view showing a light emitting device according to a fifth embodiment of the present invention. The difference from Embodiment 4 is that the light guide 10 is processed at the tip or itself. And a light condensing function is added. In the configuration shown in FIG. 5, the tip of the light guide 10 is processed into a tapered shape to condense light.

(Embodiment 6) FIG. 6 shows an embodiment of a thin illuminating device using the light emitting device according to the present invention. The light emitting device according to Embodiment 3 or 4 is used as a picture as an edge light. And used as a light source for exhibiting photographs.

In this embodiment, the light guide 10 is formed of a transparent acrylic plate or the like, and a pattern P or the like is drawn on the surface thereof. The thin lighting device can be used for general displays of public facilities such as department stores, shopping centers, passageways, theaters, and stations, and evacuation guidance displays for emergency exits and the like.

In this embodiment, the light source portion 1 and the display portion 1
0 can be integrally formed, so that the light source portion 1
In addition to being extremely thin, it can be manufactured at low cost. Further, since the emitted light can be used without waste, an efficient display device can be provided. Furthermore, since light collection and diffusion can be performed simultaneously by processing a glass substrate, a display device having a simple structure can be provided.

(Embodiment 7) FIG. 7 shows another embodiment of a thin illuminating device using a light emitting device according to the present invention, which is used as a lighting device for displaying pictures and photographs. Since the light-emitting device according to the present invention generates very little heat and emits no ultraviolet light, damage due to thermal deterioration of a subject to be irradiated, such as a picture or a photograph, and fading due to ultraviolet light, can be extremely small.

[0021]

As described above, according to the present invention, a field emission type electron emission source is formed on one of two insulating substrates (for example, a glass substrate) which are opposed to each other at a predetermined interval, and the other A flat light-emitting device in which a light-emitting substance (for example, a phosphor) that emits light by excitation by electrons emitted from an electron-emitting source is formed, wherein light output from the light-emitting substance is extracted from an end face side. Accordingly, it is possible to provide a light-emitting device suitable for a light source such as a thin display device which does not emit ultraviolet light and generates less heat.

In addition, when the light emitting device according to the present invention is used for a lighting device, a thin display device or the like which does not suffer from thermal deterioration of an object to be irradiated or fading due to ultraviolet rays can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a first embodiment of a light emitting device according to the present invention.

FIG. 2 is a schematic view showing a second embodiment of the light emitting device according to the present invention.

FIG. 3 is a schematic view showing a third embodiment of the light emitting device according to the present invention.

FIG. 4 is a schematic diagram showing a light emitting device according to a fourth embodiment of the present invention.

FIG. 5 is a schematic view showing a fifth embodiment of the light emitting device according to the present invention.

6A and 6B show one embodiment of a thin lighting device using the light emitting device according to the present invention, wherein FIG. 6A is a perspective view and FIG.
Is a sectional view.

FIG. 7 is a perspective view showing another embodiment of a thin illuminating device using the light emitting device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vacuum sealing body 2 Glass substrate 3 Glass substrate 4 Side plate 5 Field emission type electron emission source 6 Light emitting substance 7 Transparent conductive film 8 Reflecting film 9 Light guide 10 Light guide

Claims (5)

[Claims] 1. A field emission type electron emission source is formed on one of two insulating substrates opposed to each other at a predetermined interval, and
A flat light-emitting device in which a light-emitting substance excited and emitted by electrons emitted from the electron-emitting source is formed on the other substrate, wherein light output from the light-emitting substance is extracted from an end face side. Light emitting device. 2. The light emitting device according to claim 1, wherein a light guide is provided on the end face side. 3. The light-emitting device according to claim 1, wherein the insulating substrate on which the light-emitting substance is formed has a light-transmitting property, and light is extracted from an end surface of the light-transmitting substrate. 4. The light-emitting device according to claim 3, wherein said light-transmitting substrate extends outward from said end face to form a light guide. 5. A thin lighting device using the light emitting device according to claim 1 as a light source.