JPH06203796A - Fluorescence light source and manufacture thereof and display device using this light source - Google Patents

Abstract

PURPOSE:To provide brightness with no unevenness and further to form a device into a thin type, in a fluorescence light source used as a back light of the liquid crystal display device. CONSTITUTION:Phosphers 3, 4 are applied to surfaces opposed to each other of two sheets of glass plates 1, 2, to form electrodes 5a, 5b, 6a, 6b and further to form seal materials 7, 8. Two sheets of the glass plates 1, 2 are pasted together through the seal materials 7, 8. Inert gas is sealed between two sheets of the glass plates 1, 2 in the inside of the seal materials 7, 8. Opening parts 9, 10 are sealed with conductive resin 11, and lead wires 13, 14 are mounted on the conductive resins 11, 12. Here because a total unit is of flat plate shape, light is uniformly emitted from a plane, accordingly unevenness can be prevented from being generated in brightness, and a device can be formed into a thin type.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent light source, a method for manufacturing the same, and a display device using the same.

[0002]

2. Description of the Related Art In a liquid crystal display device used in a liquid crystal television or the like, since the liquid crystal display panel (display element) itself does not have a self-luminous ability, a U-shaped backlight is provided on the back side of the liquid crystal display panel. There is one provided with a W-shaped fluorescent tube. By the way, for example, a U-shaped fluorescent tube has a structure in which a straight tube portion is continuously provided at both ends of the curved tube portion. Therefore, due to its characteristic, the brightness of the curved tube portion is different from that of the straight tube portion. 60-7
There is only 0% and the brightness is uneven. Then, due to the uneven brightness, uneven brightness occurs on the liquid crystal display panel.

[0003]

As described above, the conventional U
The letter-shaped or W-shaped fluorescent tube has a problem in that there is unevenness in brightness due to its characteristic, and unevenness in brightness occurs on the liquid crystal display panel due to this unevenness in brightness. Further, since the U-shaped or W-shaped fluorescent tube is made of an elongated glass tube, there is a limitation in thinning the liquid crystal display device itself. An object of the present invention is to provide a fluorescent light source which has uniform brightness and can be made thin, a method for manufacturing the same, and a display device using the same.

[0004]

According to a first aspect of the present invention, there is provided a fluorescent light source, wherein two glass plates, each having a fluorescent substance applied to opposite surfaces thereof and electrodes formed thereon, are bonded to each other via a sealing material, An inert gas is sealed between the both glass plates inside the sealing material. 3. The method for manufacturing a fluorescent light source according to claim 2, wherein the two glass plates, on which the fluorescent substances are applied and the electrodes are formed on the opposite surfaces, respectively, are sealed with a sealing material except for the portions where the electrodes are formed. And pasting them together, injecting an inert gas between the both glass plates inside the sealing material through the opening formed in the portion where the electrode is formed, and then sealing the opening with a conductive resin. It was designed to stop. According to a third aspect of the present invention, the display device is provided on the upper surface of the fluorescent light source according to the first aspect.

[0005]

According to the present invention, since the fluorescent light source has a flat plate shape and emits light uniformly from the flat surface, there is no unevenness in brightness and it is possible to reduce the thickness. Note that claim 3
In the case of the described invention, it is possible to prevent uneven brightness from occurring on the display element, and to reduce the thickness of the display device itself.

[0006]

1 (A) to 1 (C) show respective steps of manufacturing a fluorescent light source in an embodiment of the present invention. Therefore, the structure of the fluorescent light source will be described together with its manufacturing method with reference to these drawings in order.

First, as shown in FIG. 1 (A), MgWO ₄ is formed on the opposite surfaces of two rectangular glass plates 1 and 2,
A fluorescent substance 3 made of Zn ₂ SiO ₄ , Cd ₂ B ₂ O ₅ or the like,
Apply 4. Next, the electrodes 5 are provided at both ends in the length direction of the surfaces of the two glass plates 1 and 2 facing each other and in the center in the width direction.
a, 5b, 6a, 6b are formed. Next, the electrodes 5a, 5b, 6a and 6b on the surfaces of the two glass plates 1 and 2 facing each other.
Sealing materials 7 and 8 made of an inorganic substance such as low-melting glass are formed on the periphery except the portion where the is formed.

Next, as shown in FIG. 1 (B), two glass plates 1 and 2 are superposed with sealing materials 7 and 8 interposed therebetween, and then two glass plates 1 and 2 are stacked. The two glass plates 1 and 2 are bonded to each other via the seal members 7 and 8 by thermocompression bonding from both sides. In this state, both electrodes 5a, 6a on one side and both electrodes 5 on the other side are
Openings 9 and 10 are formed in portions b and 6b. Next, the opening 9 on one side is sealed with a conductive resin 11 made of silver paste, silver-palladium paste, gold-palladium paste, or the like, and the conductive resin 11 is electrically connected to both electrodes 5a, 6a on one side. Connect to each other.

Next, the two glass plates 1 and 2 are placed in a vacuum chamber (not shown), and the inside of the vacuum chamber is evacuated.
A vacuum is created between the two glass plates 1 and 2 inside the sealing materials 7 and 8 through the opening 10 on the other side. Next, by introducing an inert gas such as Ne, Ar, Kr, or Xe or a mixed gas of two or more of these into the vacuum chamber,
The same gas is injected between the two glass plates 1 and 2 inside the sealing materials 7 and 8 through the opening 10 on the other side.

Next, the two glass plates 1 and 2 are taken out from the vacuum chamber, and then, as shown in FIG. 1C, the opening 10 on the other side is opened with silver paste, silver-palladium paste, gold-
The conductive resin 12 is sealed with a conductive resin 12 made of palladium paste or the like, and the conductive resin 12 is applied to both electrodes 5b on the other side.
6b electrically connected. Next, both conductive resins 11, 1
One end of each of the lead wires 13 and 14 is attached to the lead wire 2 by solder (not shown). Thus, the fluorescent light source 2 of this embodiment
1 is manufactured.

In the thus obtained fluorescent light source 21, both electrodes 5a, 6a on one side and both electrodes 5b on the other side,
When a discharge is generated between the fluorescent substance 3 and 6b, both fluorescent substances 3 and 4 emit light. In this case, since the fluorescent light source 21 has a flat plate shape, the fluorescent light source 21 emits light uniformly from the flat surface, so that it is possible to prevent uneven brightness.
In addition, since this fluorescent light source 21 has a flat plate shape, it can be made thin.

Next, FIG. 2 shows a main part of a liquid crystal display device having the fluorescent light source 21. In this liquid crystal display device, a liquid crystal display panel (display element) 22 is arranged above the fluorescent light source 21. Of these, liquid crystal display panel 2
Reference numeral 2 is for displaying a television image or the like, and although not shown in detail, liquid crystal is sealed between two transparent substrates 23 and 24 made of a glass substrate or a resin film, and the upper transparent substrate is provided. A deflection plate 25 is provided on the upper surface of 23, and a deflection plate (not shown) is provided on the lower surface of the lower transparent substrate 24. Since this liquid crystal display device is provided with the flat fluorescent light source 21, it is possible to prevent uneven brightness from occurring on the liquid crystal display panel 22, and to make the liquid crystal display device itself thin.

[0013]

As described above, according to the present invention, since the fluorescent light source has a flat plate shape and can emit light uniformly from the flat surface, there is no unevenness in brightness and the device can be made thin. . According to the third aspect of the present invention, it is possible to prevent uneven brightness from occurring on the display element, and it is possible to reduce the thickness of the display device itself.

[Brief description of drawings]

1A to 1C are perspective views showing respective manufacturing steps of a fluorescent light source in an embodiment of the present invention.

FIG. 2 is a perspective view of a main part of a liquid crystal display device including the fluorescent light source.

[Explanation of symbols]

 1, 2 Glass plate 3, 4 Fluorescent substance 5a, 5b, 6a, 6b Electrode 7, 8 Sealing material 9, 10 Opening 11, 12 Conductive resin 13, 14 Lead wire 21 Fluorescent light source 22 Liquid crystal display panel (display element)

Claims (3)

[Claims] 1. A glass plate having fluorescent materials applied to opposite surfaces and having electrodes formed thereon is bonded to each other via a sealant, and the glass plate is inert between the two glass plates inside the sealant. A fluorescent light source characterized by being filled with gas. 2. A portion of two glass plates, each of which has a fluorescent material applied to the opposite surfaces thereof and on which electrodes are formed, excluding a portion on which the electrodes are formed, is pasted together with a sealing material, and the electrodes are An inactive gas is injected between the both glass plates inside the sealing material through an opening formed in the formed portion, and then the opening is sealed with a conductive resin. Manufacturing method of fluorescent light source. 3. A display device comprising a display element provided on the upper surface of the fluorescent light source according to claim 1.