JP2002334780A - El lamp and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an EL lamp used for lighting various kinds of electronic apparatuses with low luminescent unevenness and uniform brightness, and provide a method for manufacturing the EL lamp. SOLUTION: This EL lamp is constituted in such a way that a phosphor layer 13 formed by dispersing phosphor powder 13B in thermo-softening synthetic resin 13A is piled up on a light transmitting electrode layer 2 on a substrate 1, heated and pressed, and a dielectric layer 4 and a back electrode layer 5 are piled up on the phosphor layer 13. By this constitution, the EL lamp with low luminescent unevenness and uniform brightness can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an EL lamp used for illuminating a display section or an operation section of various electronic devices and a method of manufacturing the same.

[0002]

2. Description of the Related Art In recent years, as various electronic devices, particularly small portable terminal devices such as mobile phones, have become more sophisticated and diversified, EL lamps have been widely used for illuminating display units and operation units. Has become.

[0003] Such a conventional EL lamp will be described with reference to FIG.

FIG. 4 is a sectional view of a conventional EL lamp.
In FIG. 1, reference numeral 1 denotes a transparent substrate such as glass or film, and a light-transmissive electrode layer 2 of indium tin oxide or the like is formed on the entire upper surface thereof by a sputtering method or an electron beam method.

A phosphor layer 3 in which a phosphor powder 3B such as zinc sulfide as a base material for light emission is dispersed in a synthetic resin 3A, or barium titanate or the like is dispersed in the synthetic resin 3A. The dielectric layer 4, the back electrode layer 5 made of silver or carbon resin, and the insulating layer 6 made of epoxy, polyester resin or the like are sequentially formed by printing to form an EL lamp.

In the above configuration, when an EL lamp is mounted on an electronic device and an AC voltage is applied between the light transmitting electrode layer 2 and the back electrode layer 5 from a circuit (not shown) of the electronic device,
The phosphor powder 3B in the light emitting layer 3 emits light, and the light illuminates the display unit, the operation unit, and the like of the electronic device from behind.

[0007] In such a conventional EL lamp, the luminous layer 3 is formed by a paste in which a phosphor powder 3B is dispersed in a synthetic resin 3A dissolved in an organic solvent.
The screen was formed by using a screen knitted with a stainless wire or a polyester wire having a diameter of about 30 μm and performing printing by passing a paste through the screen, that is, screen printing, and then drying.

[0008]

However, in the above-mentioned conventional EL lamp, since the luminous layer 3 is formed by screen printing, the lines of the screen or the intersections of the lines, such as the phosphor A, are used. A portion where the powder 3B is rough or absent is likely to be generated, and a dense portion in which a plurality of phosphor powders 3B overlap, such as a portion B, is likely to be generated at a portion corresponding to the opening. It is difficult to uniformly disperse the phosphor powder 3B, and there is a problem that when light is emitted, uneven emission is likely to occur.

An object of the present invention is to solve such a conventional problem and to provide an EL lamp in which phosphor powder is uniformly dispersed, emission unevenness is small, and good illumination is provided, and a method of manufacturing the same. Aim.

[0010]

To achieve the above object, the present invention has the following arrangement.

According to the first aspect of the present invention, a light emitting layer in which a phosphor powder is dispersed in a thermosoftening synthetic resin is formed on a light transmitting electrode layer of a base material. After heating and pressurizing the light emitting layer, a dielectric layer and a back electrode layer are formed on the light emitting layer to form an EL lamp,
The phosphor powder moves from a dense portion to a rough portion by heating and pressing, and the luminescent powder is uniformly dispersed in the luminescent layer. Therefore, uneven emission is small, and uniform and good illumination can be achieved. At the same time, since the voltage is applied efficiently, a high-luminance EL
It has the effect that a lamp can be obtained.

According to a second aspect of the present invention, in the first aspect of the invention, the main component of the synthetic resin of the luminous body layer is any one of a cyano-based resin or a fluorine-based rubber, a polyester resin, and a phenoxy resin. In addition, by forming the luminous layer with these high dielectric constants, there is an effect that a high-brightness EL lamp can be obtained.

According to a third aspect of the present invention, in the first aspect of the present invention, the volume ratio of the phosphor powder to the synthetic resin in the light emitting layer is set to 20 to 200%, and the paste for screen printing is used. Has the effect of uniformly dispersing the phosphor powder in the light emitting layer without impairing the fluidity of the phosphor.

According to a fourth aspect of the present invention, a light-emitting layer in which a phosphor powder is dispersed in a heat-softening synthetic resin is formed on a light-transmitting electrode layer of a base material. The method for manufacturing an EL lamp according to claim 1, wherein the dielectric layer and the back electrode layer are formed on the layer after heating and pressurizing the layer. And an inexpensive EL lamp can be realized.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, after forming the luminous body layer, the luminous body layer is heated and pressed by a rotatable roller. This has the effect that the phosphor powder can be uniformly dispersed in the body layer.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.

The same components as those described in the section of the related art are denoted by the same reference numerals, and detailed description will be omitted.

(Embodiment) FIG. 1 is a sectional view of an EL lamp according to an embodiment of the present invention.
Is a transparent base material such as glass, film, synthetic resin, etc., on which a transparent synthetic resin in which indium tin oxide or the like is dispersed is printed by a sputtering method, an electron beam method, or the like, so that the light-transmitting electrode layer 2 is formed. ing.

On top of this, a heat-softening synthetic resin 1
3A, a phosphor powder 13 such as zinc sulfide coated with copper or the like.
The light-emitting layer 13 in which B is uniformly dispersed, the dielectric layer 4 in which barium titanate or the like is dispersed in a synthetic resin, the back electrode layer 5 of silver or carbon resin, and the insulating layer 6 of epoxy or polyester resin are also provided. The EL lamp is formed by printing and forming one by one.

A method of manufacturing an EL lamp having such a configuration will be described with reference to the cross-sectional view of FIG.

First, as shown in FIG. 2 (a), a light-transmissive electrode layer 2 is formed on the upper surface of a base material 1, and a heat-softening electrode layer 13B in which a phosphor powder 13B such as zinc sulfide is dispersed. Synthetic resin 13
By A, the luminous body layer 13 is formed by printing.

As a material of the synthetic resin 13A of the luminous body layer 13, a cyano resin, a fluorine rubber, a polyester resin, a phenoxy resin, or the like can be used. Since it is better that the dielectric constant of the resin of the luminous body layer 13 alone is high, a high dielectric cyano-based resin or a fluorine-based rubber is preferable.

On the other hand, if the amount of the phosphor powder 13B dispersed in the synthetic resin 13A in the light emitting layer 13 is too small, a portion where the dispersion of the phosphor powder 13B is coarse or absent tends to occur.
If the amount is too large, the fluidity of the paste at the time of screen printing is impaired, so that the volume ratio is preferably from 20 to 200%.

Next, as shown in FIG. 2B, the phosphor powder 13B is mixed in the synthetic resin 13A by the flat plate 15 which is kept parallel to the substrate 1 and heated to a temperature at which the synthetic resin 13A softens. Is pressed over the entire surface of the luminous body layer 13 in which sparse and dense are dispersed.

As a result, as shown in FIG.
The phosphor powder 13B moves from the dense portion to the coarse portion, and the phosphor powder 13B is uniformly dispersed in the synthetic resin 13A to form the light emitting layer 13.

Finally, a dielectric layer 4, a back electrode layer 5, and an insulating layer 6 are sequentially formed on the light emitting layer 13 by printing to form an EL lamp, as shown in FIG. .

In the above configuration, when the EL lamp is mounted on an electronic device and an AC voltage is applied between the light transmitting electrode layer 2 and the back electrode layer 5 from a circuit (not shown) of the electronic device,
The phosphor powder 13B in the light emitting layer 13 emits light, and the light illuminates the display unit, the operation unit, and the like of the electronic device from behind.

As described above, according to the present embodiment, the luminous layer 13 in which the phosphor powder 13B is dispersed in the heat-softening synthetic resin 13A is heated and pressurized to thereby form the luminous layer 13
An EL lamp in which phosphor powder 13B is uniformly dispersed, emission unevenness is small, and uniform and good illumination can be obtained, and a method for manufacturing the same can be obtained.

The EL lamp is formed by forming the synthetic resin 13A of the light emitting layer 13 as a main component with a high dielectric constant of a cyano-based resin or a fluorine-based rubber, a polyester resin, or a phenoxy resin. High luminance can be obtained.

By setting the volume ratio of the phosphor powder 13B to the synthetic resin 13A in the luminescent layer 13 to 20 to 200%, the fluidity of the paste during screen printing is not impaired. The phosphor powder can be dispersed uniformly.

Further, as shown in the cross-sectional view of FIG. 3, instead of the flat plate 15, a cylindrical roller 16 heated in parallel with the base material 1 is used, and the roller 16 is rotated to heat the light emitting layer 13. By pressing, the phosphor powder can be uniformly dispersed in the light emitting layer with a simple device and operation.

In the above description, the heated flat plate 15
Alternatively, the configuration in which the light-emitting body layer 13 is heated and pressed by the roller 16 has been described. However, according to the material and thickness of the substrate 1, the flat plate 15 and the roller 16 are kept at room temperature, and the holding table ( The luminous body layer 13 is heated and pressurized by heating its side, or both are heated,
The present invention can be practiced even if both are set to normal temperature and heated at ambient temperature.

[0033]

As described above, according to the present invention, it is possible to obtain an advantageous effect that it is possible to obtain an EL lamp capable of achieving uniform and good illumination with less uneven light emission and a method of manufacturing the same.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an EL lamp according to an embodiment of the present invention.

FIG. 2 is a sectional view showing the manufacturing method.

FIG. 3 is a sectional view showing another manufacturing method.

FIG. 4 is a cross-sectional view of a conventional EL lamp.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 base material 2 light-transmitting electrode layer 4 dielectric layer 5 back electrode layer 6 insulating layer 13 luminescent layer 13A synthetic resin 13B phosphor powder 15 flat plate 16 roller

Continued on the front page (72) Inventor Koji Tanabe 1006 Kadoma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F term (reference) 3K007 AB02 AB18 CA01 CB01 DA04 DA05 DB02 EA02 EA03 FA01

Claims (5)

[Claims] 1. A light-transmitting electrode layer formed on a light-transmitting substrate, and a light-emitting layer in which phosphor powder is dispersed in a synthetic resin formed on the light-transmitting electrode layer. A dielectric layer and a back electrode layer formed so as to overlap with the luminous layer, and the synthetic resin of the luminous layer is made heat-softening,
An EL lamp in which a light-emitting layer is formed by applying heat and pressure after forming on the light-transmitting electrode layer. 2. The EL lamp according to claim 1, wherein a main component of the synthetic resin of the luminous body layer is any one of a cyano resin, a fluorine rubber, a polyester resin, and a phenoxy resin. 3. The EL according to claim 1, wherein the volume ratio of the phosphor powder to the synthetic resin in the light emitting layer is 20 to 200%.
lamp. 4. The method according to claim 1, wherein the light-transmitting electrode layer is formed on a substrate.
A light-emitting layer in which phosphor powder is dispersed in a heat-softening synthetic resin is formed on the light-transmitting electrode layer, and after heating and pressing the light-emitting layer, the dielectric layer and the back electrode layer are formed. The method for manufacturing an EL lamp according to claim 1, wherein the EL lamp is formed in an overlapping manner. 5. The method for producing an EL lamp according to claim 4, wherein after forming the luminous body layer, the luminous body layer is heated and pressed by a rotatable roller.