JP2000277259A - El lamp and el lamp unit using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an EL lamp of multi-color emission type, capable of emitting different colors clearly with high brightness using a less number of component layers. SOLUTION: Color filter layers 14a and 14b are formed on a transparent board 5, in such a way as overlapped on optical transmission electrode layers 6a and 6b in the form of thin stripes, and thereon a light emitting substance layer 15 and a dielectric substance layer 8 are formed so as to make white light emission, whereon a back face electrode layer 12 is formed so that as EL lamp is attained, and thereby the resultant lamp emits light clearly with a high brightness and hardly generates unevenness in brightness.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multicolor emission-distributed electroluminescence lamp (hereinafter, referred to as an EL lamp) which can be used as a backlight or a display element of an LCD or a switch key of various electronic devices and the like. The present invention relates to an EL lamp unit using the same.

[0002]

2. Description of the Related Art A conventional two-color emission dispersion type EL lamp will be described with reference to FIGS.

FIG. 9 is an external perspective view of a conventional two-color emission distributed EL lamp. In FIG. 9, reference numeral 1 denotes a light emitting surface of the EL lamp, 2 denotes an external extraction electrode of a first light transmitting electrode layer, 3 is an external extraction electrode of the second light transmitting electrode layer, 4
Indicates an external extraction electrode of the back electrode layer.

FIGS. 10 and 11 respectively show X-
FIG. 5 is a cross-sectional view along the X-ray line and a cross-sectional view along the YY line, where 5 is a transparent substrate such as a transparent resin film or glass, 6 is a first light-transmitting electrode layer formed by vacuum evaporation or sputtering of indium tin oxide, 7 Is a first luminescent layer in which a particulate phosphor such as copper-doped zinc sulfide is dispersed in a high dielectric cyano resin or a fluoro rubber resin, and 8 is a high dielectric powder such as barium titanate. A first dielectric layer dispersed in a resin similar to one luminescent layer, 9 a second light-transmissive electrode layer in which indium tin oxide powder is dispersed in a transparent resin, 10 a zinc sulfide doped with copper, etc. A second phosphor layer in which a particulate phosphor of the above and a fluorescent pigment or a fluorescent dye for color conversion of light emission are dispersed in a highly dielectric cyano-based resin or a fluororubber-based resin; 11 is a high dielectric material such as barium titanate; Powder with a second phosphor Second dielectric layer dispersed in syngeneic resin, 12 back electrode layer with silver resin-based or carbon resin system paste, 13 denotes an insulating protective layer due to cover resisting insulating.

In each of the above drawings, the thickness of each constituent layer is drawn larger than the actual thickness for easy understanding, but the first light-transmitting electrode layer 6 is actually several tens to several hundreds nm. ,
Other layers are several μm to several tens μm except for the transparent substrate 5.

As another type of EL lamp which emits multicolor light, Japanese Patent Application Laid-Open No. 60-13097 discloses a light-transmitting electrode layer formed in a stripe shape and an odd-numbered and even-numbered light-emitting layer. By changing the emission color and alternately forming stripes on the light-transmitting electrode layer, the external extraction electrodes for the odd-numbered and even-numbered luminous body layers are independently taken out, and a voltage is applied to apply a multi-color. EL lamps that emit light have been proposed.

[0007]

However, in the above-mentioned conventional two-color light emitting EL lamp, when the second light emitting layer 10 emits light, the light is emitted by the second light transmitting electrode layer 9 and the first dielectric layer. Since the light is emitted through the layer 8, the first light-emitting layer 7, the first light-transmitting electrode layer 6, and the transparent substrate 5, there is a problem that the luminance is significantly reduced.

Similarly, in order to emit the light of the second luminous body layer 10, the first dielectric layer 8 is coated with a powder such as high dielectric constant titanate for enhancing the luminance. It could not be filled, so that the light emission luminance of the first light emitting layer 7 had to be significantly lower than that of a conventionally known monochromatic dispersion type EL lamp.

[0009] Naturally, the number of times of printing is higher than that of the conventional monochromatic dispersion type EL lamp, and the lamp is expensive.

[0010] Further, in other types of conventionally proposed dispersive EL lamps that emit multicolor light, the phosphor powder dispersed in the luminous layer generally has a large average particle diameter of about 30 µm. However, when this is dispersed in a synthetic resin and is alternately printed in the form of fine line stripes in accordance with the transparent electrode by screen printing or the like, there is a problem that it is difficult to form a fine pitch line width.

For this reason, E formed with a line width of a rough pitch
When each single color of the L lamp emits light, there is a problem that it does not look like planar light emission but only stripes.

In addition, since the phosphor powder has a large particle diameter as described above, the coating thickness of the light emitting layer is large and the unevenness is large, and the light emitting layers of two different colors are alternately formed in stripes. In the case of a printing configuration such as that described above, the portions that overlap each other due to a small printing dimensional deviation are further thicker in the coating thickness and the unevenness is increased, so that the dielectric applied to the light emitting layer due to the unevenness. Layer or back electrode layer is difficult to print, or even if printing is possible, pinholes are likely to occur because the distance between the light transmissive electrode layer and the back electrode layer is partly greatly different, resulting in poor withstand voltage and uneven brightness. There was a problem that it easily occurred.

Further, the emission color of the phosphor for the dispersion type EL is generally blue-green in terms of luminance. When the light-emitting layer emits red, green, and blue light, the phosphor layer emits a fluorescent light. It is necessary to disperse pigments and fluorescent dyes and directly convert the colors to red, green, and blue.Besides in a dark room, fluorescent pigments and the like are colored even by external light. There is a problem that it is difficult to distinguish a portion that is lit and a portion that is not lit, making it difficult to see.

The present invention solves such a conventional problem. The present invention solves this problem by reducing the number of times of printing and achieving uniform, clear, high-brightness two-color or full-color on the same plane of a single distributed EL lamp. An object of the present invention is to provide an EL lamp which has a light-emitting color, is easy to see when used as a display element, and hardly causes a withstand voltage defect and luminance unevenness.

[0015]

In order to solve the above-mentioned problems, a dispersion-type EL lamp according to the present invention comprises a light-transmissive electrode layer having a fine stripe shape formed on a transparent substrate; A light-transmissive color filter layer colored in red, blue, and green is formed by repeatedly forming a light-transmissive color filter layer colored in each of red, blue, and green on the conductive electrode layer in a stripe shape. On the entire surface of the filter layer, a phosphor layer that emits substantially white light is formed by dispersing a phosphor for EL of blue-green emission color and a fluorescent pigment for converting the blue-green emission color to red. Then, a highly dielectric dielectric layer is formed on the light emitting layer, and a back electrode layer is formed on the dielectric layer.

Thus, the number of times of printing is small and uniform and clear on the same plane of a single distributed EL lamp.
An EL lamp having two colors of high luminance or full-color light emission, which is easy to see when used as a display element, and in which a withstand voltage defect and luminance unevenness hardly occur is obtained.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention described in claim 1 of the present invention is different from the first embodiment in that a thin-line striped light-transmitting electrode layer formed on a transparent substrate and a thin-line striped light-transmitting electrode layer are formed. A light-transmissive color filter layer colored in two colors is alternately and repeatedly formed in a stripe shape, and a blue-green EL light-emitting color is formed on the entire surface of the light-transmissive color filter layer colored in two different colors. A phosphor layer that emits substantially white light is formed by dispersing a phosphor for use and a fluorescent pigment that converts this blue-green emission color into red, and a high dielectric This is a two-color EL lamp in which a body layer is formed, and a back electrode layer is further formed on this dielectric layer.
Two different emission colors can be obtained on the same light emission surface of the L lamp, and two composite colors can be obtained by emitting two colors at the same time. This has the effect of realizing a clear and high-brightness EL lamp.

According to a second aspect of the present invention, there is provided a light-transmitting electrode layer in the form of a fine line stripe formed on a transparent substrate, and a light colored in two different colors on the light-transmitting electrode layer in the form of fine line stripe. A transmissive color filter layer is alternately and repeatedly formed in a stripe shape, and a blue-green light emitting EL phosphor is dispersed over the entire surface of the light transmissive color filter layer colored in two different colors. A luminous layer is formed, and a fluorescent pigment for converting a blue-green luminous color to red is dispersed on the luminous layer. The luminous color of the luminous layer is substantially converted to a white luminous color. A two-color light emitting EL lamp in which a high dielectric layer obtained is formed, and a back electrode layer is further formed on the dielectric layer to form a two-color EL lamp. In addition to the action, a large amount of phosphor powder of about 30 μm The dispersed luminescent layer generally has poor printability than other layers, and if a fluorescent pigment or the like is added for emission color conversion, the printability may be further impaired. By substantially converting the color to white with the addition of such a compound, there is an effect that the printability of the luminous body layer is not impaired, and uneven brightness is hardly generated.

According to a third aspect of the present invention, there is provided a light-transmitting electrode layer in the form of a fine line stripe formed on a transparent substrate, and a blue-green light-emitting color formed on the entire surface of the light-transmitting electrode layer in the form of fine line stripe. A phosphor layer that emits substantially white light is formed by dispersing a phosphor for EL and a fluorescent pigment that converts this blue-green emission color to red, and is superposed on this phosphor layer to have a high dielectric property. A dielectric layer is formed, and a back electrode layer is further formed on the dielectric layer. Two different colors are provided at positions on the opposite surface of the transparent substrate corresponding to the light-transmitting electrode layers in the form of the fine line stripes. A two-color emission EL lamp formed by alternately repeating a light-transmitting color filter layer colored with a stripe in the form of a stripe. In addition to the same effect as the invention according to claim 1, Each layer other than the color filter layer is formed in advance If it has the effect of various combinations of colors it is easily formed by arbitrarily selecting the color of the color filter layer.

According to a fourth aspect of the present invention, there is provided a light-transmitting electrode layer having a thin-line stripe shape formed on a transparent substrate, and a blue-green luminescent color on the entire surface of the light-transmitting electrode layer having the thin line stripe shape. Forming a luminous layer in which a phosphor for EL is dispersed, and dispersing a fluorescent pigment for converting a blue-green luminous color to red over the luminous layer; substantially the luminous color of the luminous layer; To form a high-dielectric dielectric layer capable of converting the color to white emission color, further form a back electrode layer on this dielectric layer,
A light-transmissive color filter layer colored in two different colors is alternately and repeatedly formed in a stripe shape at a position on the opposite surface of the transparent substrate corresponding to the light-transmissive electrode layer having the fine wire stripe. This is a color light emitting EL lamp. In addition to the same function as the invention according to claim 1, a light emitting layer in which phosphor powder of about 30 μm is dispersed in a large amount is generally another layer. The printability is worse than that, and if a fluorescent pigment or the like is added for emission color conversion, the printability may be further impaired, but the fluorescent layer or the like is added to the dielectric layer to substantially convert the color to white. By doing so, the printability of the luminous body layer is not impaired, and the unevenness of luminance is unlikely to occur.If the layers other than the color filter layer are formed in advance, the color of the color filter layer can be arbitrarily selected. By The combination of various colors Te has an effect that it becomes easier to form.

According to a fifth aspect of the present invention, in the first aspect of the present invention, the light-transmitting electrode layers in the form of fine wire stripes are alternately provided on the same surface of the transparent substrate. The two-color EL lamps are connected to each other, and when the distributed EL lamp of the present invention is turned on, the extraction electrodes can be collected for each color so that the external connection structure can be simplified. Have.

According to a sixth aspect of the present invention, there is provided a light-transmitting electrode layer in the form of a fine line stripe formed on a transparent substrate, and red, blue and green colors on the light-transmitting electrode layer in the form of fine line stripe. A colored light-transmissive color filter layer is sequentially formed repeatedly in a stripe shape, and a blue-green luminescent color is formed on the entire surface of the light-transmissive color filter layer colored with each of the red, blue, and green colors. A phosphor layer that emits substantially white light is formed by dispersing a phosphor for EL and a fluorescent pigment that converts this blue-green emission color to red, and is superposed on this phosphor layer to have a high dielectric property. This is a multicolor EL lamp in which a dielectric layer is formed, and a back electrode layer is further formed on the dielectric layer.
Since the red, green, and blue colors can be freely lit on the same light emitting surface of the lamp, a clear, easy-to-see, full-color luminescent color with high luminance can be obtained.

According to a seventh aspect of the present invention, there is provided a light-transmitting electrode layer in the form of a fine line stripe formed on a transparent substrate, and red, blue and green colors on the light-transmitting electrode layer in the form of fine line stripe. A colored light-transmitting color filter layer is sequentially and repeatedly formed in a stripe shape, and a blue-green emission color EL is formed on the entire surface of the light-transmitting color filter layer colored with each of the red, blue, and green colors. A phosphor layer in which a phosphor is dispersed is formed, and a fluorescent pigment that converts the blue-green emission color to red is superposed on the phosphor layer, and the emission color of the phosphor layer is substantially changed. 7. A multicolor EL lamp in which a high-dielectric layer capable of converting color into a white light-emitting color is formed, and a back-electrode layer is further formed on the dielectric layer. In addition to the same function as that according to the described invention, about 30 μm A phosphor layer in which phosphor powder is dispersed in a large amount generally has poor printability than other layers, and when a fluorescent pigment or the like is added for emission color conversion, the printability may be further impaired. By adding a fluorescent pigment or the like to the dielectric layer and converting the color to substantially white, the printability of the luminous layer is not impaired, and the luminance unevenness is less likely to occur.

According to the present invention, a light-transmitting electrode layer in the form of a thin line stripe formed on a transparent substrate, and a blue-green luminescent color on the entire surface of the light-transmitting electrode layer in the form of thin line stripes are provided. A phosphor layer that emits substantially white light is formed by dispersing a phosphor for EL and a fluorescent pigment that converts this blue-green emission color to red, and is superposed on this phosphor layer to have a high dielectric property. A dielectric layer is formed, and a back electrode layer is further formed on the dielectric layer. Red and blue are formed at positions on the opposite surface of the transparent substrate corresponding to the light-transmitting electrode layers in the form of the fine line stripes. A multicolor EL lamp in which a light-transmitting color filter layer colored with each green color is sequentially and repeatedly formed in a stripe shape, and has the same effect as the invention according to claim 6. In addition, color filter layer must be formed last Can therefore, by lighting the EL lamp before forming the color filter layer has the effect that it is possible to check the white degree of the light-emitting layer.

According to a ninth aspect of the present invention, there is provided a light-transmitting electrode layer in the form of a thin line stripe formed on a transparent substrate, and a blue-green luminescent color on the entire surface of the light-transmitting electrode layer in the form of fine line stripe. A luminescent layer in which a phosphor for EL is dispersed is formed, and a fluorescent pigment for converting the blue-green luminescent color to red is dispersed on the luminescent layer to substantially emit the luminescent color of the luminescent layer. Forming a highly dielectric layer capable of converting the color to white light emission, further forming a back electrode layer on the dielectric layer, and forming the transparent electrode corresponding to the light-transmitting electrode layer in the form of the fine line stripe. A multicolor EL lamp formed by sequentially repeating a light-transmissive color filter layer colored in each of red, blue, and green in a stripe shape at a position on the opposite surface of the substrate. In addition to the same effects as those according to the invention described in Item 8, μm approximately phosphor powder phosphor layer which has large amount of dispersed generally poor printability than the other layers,
When a fluorescent pigment or the like is added for emission color conversion, printability may be further impaired.However, by adding a fluorescent pigment or the like to the dielectric layer and substantially converting the color to white, the emission layer is This has the effect that printability is not impaired and luminance unevenness is unlikely to occur.

According to a tenth aspect of the present invention, in the first or the sixth aspect of the present invention, the dielectric layer is white, and has the same effect as that of the first or the sixth aspect of the present invention. In addition, there is an effect that higher-luminance light emission can be obtained.

According to an eleventh aspect of the present invention, in the third or eighth aspect, the dielectric layer is white, and in addition to the effects of the third or eighth aspect, It has the effect of obtaining light emission of higher luminance.

The invention according to claim 12 is the first invention.
11. The invention according to claim 2, wherein the relative permittivity of the colored light-transmitting color filter layer is 6 or more. In addition to the function of the invention, it has the function of obtaining light emission of higher luminance.

The invention according to claim 13 is the first invention.
In the invention described in 2, 6, 7, 10 or 12, the colored light-transmitting color filter layer is formed by electrodeposition coating the light-transmitting electrode layer, and the light-transmitting electrode layer is provided for each color. Electrodeposition on the surface has an effect that a color filter layer without deviation can be formed even when the line width of the light transmitting electrode layer is narrow.

The invention according to claim 14 is the invention according to claims 1 to 1.
3. The luminescent color according to any one of the above 3, wherein the chromaticity of the luminescent color of the luminescent layer or the luminescent color of the luminescent layer converted into white by the reflected light of the dielectric layer is substantially white. Has a chromaticity of 0.26 to 0.4 for both x and y values,
When light passes through the color filter layer, it has the effect of obtaining a clear and high-luminance emission color of a desired color.

[0031] The invention according to claim 15 is the invention according to claims 1-1.
4. The method according to any one of items 4, wherein the wiring pitch of the light-transmitting electrode layer in the form of a fine line stripe is 0.05 to 0.5.
mm, which has the effect of making it easy to look uniform and planar when emitting each color.

The invention according to claim 16 is the invention according to claims 6-1.
5. In the invention according to any one of the items 5, the emission luminance ratio of each color of red: green: blue is 2 when red is green and 100 is green.
0 to 70, blue color is 8 to 30, red / green /
It has the effect of appearing white when each of the blue colors is lit.

[0033] The invention described in claim 17 is the invention according to claims 1-1.
6. The invention according to any one of 6, wherein the back electrode layer is formed in a fine line stripe shape in a direction perpendicular to the fine line stripe light transmissive electrode layer, and the arbitrary light transmissive electrode layer By selecting and lighting an arbitrary back electrode layer, an emission color of a specific dot at a specific location can be obtained.

[0034] The invention described in claim 18 is the invention according to claims 1-1.
7. In the invention according to any one of 7 above, any one of the front and back sides of the transparent substrate corresponding to at least one of a gap between the color filter layers formed in a thin line stripe and a gap between the back electrode layers formed in a thin line stripe. A black opaque layer is formed on the light-transmitting color filter layer formed on the surface or on the side opposite to the light-transmitting electrode layer, and the light-emitting layer, dielectric layer, and back electrode layer are formed on the surface. When viewed from the opposite side, a black opaque layer is formed in a striped or grid pattern on the colored light-transmitting color filter layer formed in the shape of a thin line stripe or in the gap between the layers. This has the effect that each emission color and its boundary are clearly visible, clearer and easier to see.

[0035] The invention described in claim 19 is the invention according to claims 1-1.
8. In the invention described in any one of 8. above, an insulating protective layer is formed at least on the back electrode layer, and has an effect of preventing a short circuit with another circuit and protecting the EL constituent layer.

According to the twentieth aspect of the present invention,
9. In the invention described in any one of the above 9, at least the luminescent layer is obtained by dispersing a fluorescent substance in a glass paste, and the fluorescent substance is sealed with glass. Has the effect of becoming longer.

According to the twenty-first aspect of the present invention,
0, wherein the entire surface except for the external connection electrode portion is sealed with a moisture-proof sheet, and in recent years, a phosphor encapsulated with a material such as Al ₂ O ₃ has become mainstream. However, even the encapsulated phosphor is not perfect in moisture-proof property, and the sealing with a moisture-proof sheet makes it hard to be affected by moisture, so that the operating life of the EL lamp can be extended. Having.

The invention described in claim 22 is the first or second invention.
0, wherein the transparent substrate is glass, and the entire surface except for the external connection electrode portion on the side where the luminous body layer is formed is sealed with a glass plate. Since sealing is performed with glass that does not pass through, the effect of moisture on the EL lamp can be removed, and the operation life of the EL lamp can be extended.

According to a twenty-third aspect of the present invention, in the twenty-first or twenty-second aspect, a moisture-absorbing sheet is disposed in the sealed state, and even if a very small amount of moisture enters, the moisture-absorbing sheet absorbs moisture. Accordingly, the operation life of the EL lamp can be extended.

According to a twenty-fourth aspect of the present invention, the microcomputer controls the light-transmitting electrode layer of the EL lamp and the external extraction electrode of the back electrode layer individually and selectively.
Apply / cut off AC voltage to turn on EL automatically
An EL lamp unit using the EL lamp according to any one of claims 1 to 23, wherein the EL lamp unit can be intermittently connected, and a desired place is illuminated with a desired luminescent color,
This has the effect of realizing an EL lamp unit capable of displaying desired characters, characters and moving image patterns in full color.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG.

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 1) FIG. 1 is a cross-sectional view of a dispersion type EL lamp for two-color light emission according to a first embodiment of the present invention. Reference numerals 14a and 14b denote color filter layers colored in different colors, 15 denotes a light emitting layer, 8 denotes a dielectric layer,
2 is a back electrode layer and 13 is an insulating protective layer.

In each of the drawings, the thickness direction is drawn larger than the actual size for easy understanding.

Further, the pitch of the fine wire comb-like pattern of the light transmitting electrode layers 6a and 6b and the color filter layers 14a and 14b is larger than the actual pitch, and the number of the patterns is smaller than the actual pitch.

In the above structure, the light-transmitting electrode layers 6a and 6b in the form of fine wire stripes are formed by wet etching by a photoresist method or dry etching by a laser using a light-transmitting conductive film formed by vacuum deposition or sputtering of indium tin oxide. .

Although the pattern pitch of the stripe is arbitrary, it is generally desirable that the pattern pitch be 0.05 mm to 0.5 mm.

The light-transmitting electrode layers 6a and 6b in the form of fine-line stripes are connected together at the end of the stripe pattern every other line, and are divided into two parts including the external extraction electrodes. And 6b are desirably patterned in the form of a fine-wire interdigitated mesh.

The color filter layers 14a and 14b formed on the light-transmitting electrode layers 6a and 6b have a relative dielectric constant of a cyano-based resin such as a cyanoethyl cellulose resin and a cyanoethyl pullulan resin or a fluororubber-based resin containing vinylidene fluoride. 6 or more synthetic resins, for example, phthalocyanine green or phthalocyanine blue, a color resin in which a colorant such as an azo red pigment is dispersed, screen printing, letterpress printing,
It is formed to have alternate colors by tampo printing or electrodeposition coating.

Among them, screen printing is the simplest, but by forming by electrodeposition coating every other electrode, the positional deviation between the light-transmitting electrode layers 6a, 6b and the color filter layers 14a, 14b can be reduced. Can be eliminated.

The paste for the light emitting layer 15 is made of a phosphor powder that emits blue-green light and a red fluorescent pigment or the like.
A paste is used which is dispersed in a high-dielectric cyano resin or a fluororubber resin similar to a and 14b and emits white light when light is emitted, and the paste for the dielectric layer 8 is a high-dielectric paste such as barium titanate. A paste in which a fine powder of a substance is dispersed in a resin similar to the paste for the light emitting layer is used. The paste for the back electrode layer 12 is a silver paste or a carbon paste which is usually used for a membrane switch. The paste for use is made of polyester, vinyl chloride, fluororubber, polyurethane or epoxy-based insulating paste having an electrical insulating property, and is formed by pattern printing and drying by screen printing or the like.

In the first embodiment, the color of the color filter layer is, for example, 14a blue and 14b orange. When an AC voltage is applied between the light transmitting electrode layer 6a and the back electrode layer 12, the color filter layer emits blue light. Light transmitting electrode layer 6b
When an AC voltage is applied between the light-transmitting electrode layers 12a and 6b, the light-transmitting electrode layers 6a and 6b are short-circuited and an AC voltage is applied between the light-transmitting electrode layers 6a and 6b. Emit light.

In this dispersed two-color light emitting EL lamp, the luminance of the light emitted from the second luminous layer does not become dark unlike the conventional two-color light emitting EL lamp, and a breakdown voltage defect and uneven luminance occur. It is no longer easy to do.

Further, since this dispersion type two-color emission EL lamp is used, for example, as a backlight of a liquid crystal display device and is not colored by a fluorescent dye or a fluorescent pigment when each of blue and orange is lit independently, There is no color interference as in the conventional case.

As described above, according to the present embodiment, clear high-luminance surface light emission of a plurality of colors can be performed from the same light-emitting surface of the dispersion-type EL lamp with a smaller number of printing times than in the related art.

In the present embodiment, the light-transmitting electrode layers 6a and 6b in the form of fine wire stripes are formed by sputtering a thin film transparent electrode by indium tin oxide or tin oxide or by electron beam method to form a thin wire comb. However, the light-transmitting electrode layers 6a and 6b may be formed by printing using a light-transmitting conductive paste.

In the case where the color of the two-color light emission is a combination of a cool color system such as blue and a warm color system such as red, the emission color of the light emitting layer 15 is made as white as possible in order to balance the respective luminances. It is necessary to approximate the values, and it is desirable that the chromaticity measured by the color luminance meter be in the range of 0.26 to 0.4 for both the x value and the y value.

(Embodiment 2) FIG. 2 is a cross-sectional view of a two-color emission type distributed EL lamp according to a second embodiment of the present invention, in which a light emitting layer 7 and a dielectric layer 16 are used. This is a different point from 1.

That is, in the present embodiment, the luminous layer 7 is formed using a paste in which a phosphor of blue-green luminescent color is dispersed in the same high dielectric resin as in the first embodiment. The layer 16 is formed using a paste in which fine powder of a high dielectric substance such as barium titanate and a red fluorescent pigment or dye are dispersed in the same high dielectric resin as the light emitting layer 7.

When the light emitting layer 7 emits light, the emission color of the EL phosphor is blue-green, but the emission color is converted by the dielectric layer 16 to white.

In the present embodiment, for example, the color of the color filter layer is 14a green, and 14b pink, and when an AC voltage is applied between the light transmitting electrode layer 6a and the back electrode layer 12, it emits green light. When an AC voltage is applied between the light transmissive electrode layer 6b and the back electrode layer 12, the light emits pink, and when the light transmissive electrode layers 6a and 6b are short-circuited and an AC voltage is applied between the light transmissive electrode layers 6a and 6b, It emits orange light which is a composite color.

In this embodiment, as in the case of the first embodiment, it is possible to emit high-luminance surface light in a plurality of colors from the same light-emitting surface of the dispersion-type EL lamp with a smaller number of printings than in the conventional case. It is possible to emit light of a plurality of colors from the same light-emitting surface of a dispersion-type EL lamp. For example, when used as a backlight of a liquid crystal display device, when green and pink are individually turned on, the color becomes There is no interference, and the luminance of the emission color of the second light emitting layer does not become dark, unlike a conventional two-color emission EL lamp, and a withstand voltage defect and luminance unevenness are likely to occur. Will be gone.

(Embodiment 3) FIG. 3 is a cross-sectional view of a two-color emission EL lamp according to a third embodiment of the present invention. Is different.

That is, in the present embodiment, the color filter layers 17a and 17b
It is formed on the opposite side of the transparent substrate 5 corresponding to a and 6b.

In the case of the first embodiment, the color filter layers 14a and 14b need to have a high dielectric property in order to secure emission luminance, but in the present embodiment, they have a high dielectric property. No need to be.

However, when the transparent substrate 5 is thick, the light of the light emitting layer 15 is diffused before reaching the color filter layers 17a and 17b via the transparent substrate 5, and color interference occurs. Is not applicable.

In the present embodiment, for example, the color of the color filter layer is 17a blue, 14b yellow,
When an AC voltage is applied between the light transmissive electrode layer 6a and the back electrode layer 12, the device emits blue light. When an AC voltage is applied between the light transmissive electrode layer 6b and the back electrode layer 12, the device emits yellow light. When an alternating voltage is applied between the negative electrode layers 6a and 6b and the back electrode layer 12 is short-circuited, green light, which is a composite color, is emitted.

In this embodiment, as in the first embodiment, it is possible to emit high-luminance surface light in a plurality of colors from the same light-emitting surface of the dispersion-type EL lamp with a smaller number of printings than in the related art. It is possible to emit light of multiple colors from the same light emitting surface of a type EL lamp. For example, when used as a backlight of a liquid crystal display device, when blue and yellow are individually turned on, color interference as in the related art occurs. In addition, unlike the conventional two-color EL lamp, the brightness of the emission color of the second light emitting layer does not become dark, and the withstand voltage failure and the uneven brightness do not easily occur. Things.

(Embodiment 4) FIG. 4 is a cross-sectional view of a dispersion type EL lamp for two-color light emission according to a fourth embodiment of the present invention. Is different.

That is, in the present embodiment, the color filter layers 17a and 17b
It is formed on the opposite side of the transparent substrate 5 corresponding to a and 6b.

In the case of the second embodiment, the color filter layers 14a and 14b need to have high dielectric properties in order to secure emission luminance, but in the present embodiment, they have high dielectric properties. No need.

However, when the transparent substrate 5 is thick, the dielectric layer 1 which converts the light of the light emitting layer 7 directly or to red is used.
This embodiment is not applicable because the light is diffused before being reflected by 6 and reaching the color filter layers 17a and 17b via the transparent substrate 5 and causing color interference.

In the present embodiment, for example, the color of the color filter layer is set to 17a blue, 14b yellow,
When an AC voltage is applied between the light transmissive electrode layer 6a and the back electrode layer 12, the device emits blue light. When an AC voltage is applied between the light transmissive electrode layer 6b and the back electrode layer 12, the device emits yellow light. When an alternating voltage is applied between the negative electrode layers 6a and 6b and the back electrode layer 12 is short-circuited, green light, which is a composite color, is emitted.

In the present embodiment, similarly to the second embodiment, it is possible to emit high-luminance surface light in a plurality of colors from the same light-emitting surface of the dispersed EL lamp with a smaller number of printing times than in the related art. It is possible to emit light of multiple colors from the same light-emitting surface of the EL lamp. For example, when used as a backlight of a liquid crystal display device, when blue and yellow are individually turned on, color interference occurs as in the conventional case. Further, unlike the conventional two-color light emitting EL lamp, the luminance of the emission color of the second light emitting layer does not become dark, and the withstand voltage failure and the luminance unevenness do not easily occur. is there.

(Embodiment 5) FIG. 5 is a cross-sectional view of a multi-color emission type distributed EL lamp according to a fifth embodiment of the present invention, wherein 6a, 6b and 6c are light-transmitting electrodes in the form of fine stripes. The layers 18a, 18b and 18c are color filter layers colored red, green and blue, respectively, 15 is a light emitting layer, 8 is a dielectric layer, 19 is a back electrode layer, and 13 is an insulating protective layer.

In the above configuration, the light transmissive electrode layer 6a,
6b and 6c are formed by wet etching by a photoresist method or dry etching by a laser using a light-transmitting conductive film formed by vacuum evaporation or sputtering of indium tin oxide.

Although the pattern pitch of the stripe is arbitrary, it is generally desirable that the pattern pitch be 0.05 mm to 0.5 mm.

The color filter layers 18a, 18b and 18 formed on the light transmitting electrode layers 6a, 6b and 6c
c is a cyanoethyl cellulose resin, a cyano resin such as cyanoethyl pullulan resin or a synthetic resin having a relative dielectric constant of 6 or more, such as a fluororubber resin containing vinylidene fluoride, for example, phthalocyanine green, phthalocyanine blue, azo red pigment, etc. Screen printing, letterpress printing, coloring resin paste or color glass paste with colorant dispersed,
It is formed to have each color by tampo printing or electrodeposition coating.

Among these, screen printing is the simplest, but by forming each color by electrodeposition coating for each electrode, the light transmitting electrode layers 6a, 6b and 6c and the color filter layers 18a, 18b and 18c are formed. Can be eliminated.

The paste for the light emitting layer 15 is made of a phosphor powder that emits blue-green light and a red fluorescent pigment or the like.
A paste is used which is dispersed in a high-dielectric cyano-based resin or fluororubber-based resin similar to that of a, 18b and 18c and emits white light when light is emitted. A paste in which a fine powder of a dielectric substance is dispersed in a resin of the same type as the paste for the light emitting layer is used. The paste for the back electrode layer 19 is a silver paste or a carbon paste which is usually used for a membrane switch. The paste for the layer 13 is formed by using a polyester-based, vinyl chloride-based, fluororubber-based, polyurethane-based or epoxy-based insulating paste having an electrical insulating property, and printing and drying the pattern by screen printing or the like.

The back electrode layer 19 is composed of the light transmissive electrode layers 6a and 6a.
In a direction perpendicular to b and 6c, the wiring pitch is formed in a stripe shape at a total pitch of the light transmitting electrode layers 6a, 6b and 6c.

In this embodiment, the light transmitting electrode layer 6
a and an arbitrary electrode of the back electrode layer 19, an intersection of each electrode emits red light, and an alternating current is applied between the light transmitting electrode layer 6b and any electrode of the back electrode layer 19. When a voltage is applied, the intersection of each electrode emits green light, and when an AC voltage is applied between any of the electrodes of the light-transmitting electrode layer 6c and the back electrode layer 19, the intersection of each electrode emits blue light to transmit light. When an alternating voltage is applied between any of the negative electrode layers 6a, 6b and 6c and an arbitrary electrode of the back electrode layer 19, white light is emitted as a composite color.

Naturally, by arbitrarily designating the light-transmitting electrode and the back electrode to which a voltage is applied, and by using a microcomputer, the position where the voltage to be applied to each of the electrodes is selectively and continuously applied is sequentially changed. By doing so, it is possible to display a moving image in full color.

Since the fluorescent color is not directly visible from the light emitting surface of the dispersed multicolor EL lamp, the EL lamp is lit, so that it is hardly seen by external light and color interference does not occur.

Further, since it is not necessary to form the luminous layer for directly converting the luminous color in the form of a stripe as in the prior art, it is easy to form a fine pitch in the stripe-shaped color filter layer. It is no longer easy to do.

In this embodiment, in order to emit full color including white, the emission luminance of each of red, green and blue is 20 to 70 for red and 8 for blue when green is 100.
It is necessary to set the luminous color in the luminous body layer 15 as white as possible as much as possible, and the chromaticity measured by the color luminance meter is 0.26 to 0.4 for both the x value and the y value. It is desirable to be within the range.

Further, in the present embodiment, the phosphor layer 15 has a white luminescent color by dispersing a phosphor of blue-green luminescent color and a red fluorescent pigment, but similar to the case of the second embodiment, Instead of dispersing the red fluorescent pigment in the luminous layer, the red pigment may be dispersed in the dielectric layer so as to approximate the white luminescent color including the reflected light.

Further, the color filter layers 18a, 18b and 18 are formed on the light transmitting electrode layers 6a, 6b and 6c.
Although c was formed, it may be formed at a position corresponding to the opposite surface of the transparent substrate 5 as in the case of the third embodiment.

(Embodiment 6) FIG. 6 is a sectional view of a multi-color emission type dispersion EL lamp according to a sixth embodiment of the present invention. In that the color filter layers 22a, 22b and 22c are formed of colored glass paste,
Is formed of a paste in which phosphor powder is dispersed in high-dielectric transparent glass, and the dielectric layer 16 is formed of a paste in which a high-dielectric substance such as barium titanate and a red fluorescent pigment are dispersed in a high-dielectric resin. In that the black opaque layer 21 is formed.

The color filter layers 22a and 22b
And 22c, a colored glass paste is used for the black opaque layer 21, and a light emitting layer 23 is also used.
Also, by using a high-dielectric transparent glass paste in which a phosphor of blue-green emission color is dispersed, and by dispersing a high-dielectric substance and a red fluorescent pigment in a high-dielectric resin for the dielectric layer 16, If the color of the emitted light is approximated to that of white light including the reflected light, the phosphor is molded in the glass in the light emitting layer 23, so that the phosphor is hardly affected by humidity, and as a result, the lighting life is prolonged. be able to.

The color glass paste and the paste for the light emitting layer are made of glass having a relative dielectric constant of 6 or more and a melting temperature of 600 ° C. or less.

Further, by forming the black opaque layer 21, light passing through the color filter layers 22a, 22b and 22c can be seen more clearly from the light emitting surface side.

(Embodiment 7) FIG. 7 is a sectional view of a multi-color emission EL lamp according to a seventh embodiment of the present invention, in which each layer of the multi-color emission EL lamp of Embodiment 6 is formed. A moisture-absorbing sheet 24 is disposed on the upper surface, and a moisture-proof sheet 25 is further attached.

This moisture-absorbing sheet uses a moisture-absorbing sheet of nylon, hydroxyacrylate, polyvinyl alcohol, etc., and the moisture-proof sheet is most preferably a sheet of ethylene trifluoride chloride. Various reduced synthetic resin films may be used.

It is known that moisture is the dominant factor in the luminance degradation of the dispersion type EL lamp, and recently, the phosphor surface is coated with aluminum oxide or titanium oxide to reduce the effect of moisture. Although body powder is common, it is not perfect against moisture degradation, and degradation due to moisture is observed even with a coated phosphor.

Therefore, it is possible to further suppress the luminance degradation by attaching the moisture-proof sheet.

(Embodiment 8) FIG. 8 is a cross-sectional view of a multi-color emission EL lamp according to an eighth embodiment of the present invention, in which each layer of the multi-color emission EL lamp of Embodiment 6 is formed. A moisture absorbing sheet 24 is disposed on the upper surface, and is sealed and adhered with a glass plate 26 having a concave surface on one side.

The sealing adhesive 27 is made of a low-melting glass paste or a synthetic resin adhesive having a low humidity permeability, and the space 28 is filled with completely dehumidified nitrogen gas, silicon oil or fluorine oil.

The dispersion type multicolor EL lamp formed in this manner is hardly affected by humidity and can have a very long lighting life.

[0100]

As described above, according to the present invention, the backlight of a liquid crystal display device is easy to see, and can be used as a full-color moving image display element without being difficult to see due to the coloring of a fluorescent pigment or the like by external light. Advantageously, a two-color or full-color EL lamp with reduced color interference, a small number of printings industrially, a simple configuration, and less occurrence of poor withstand voltage and uneven brightness can be realized. Is obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a dispersion type two-color emission EL lamp according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of a dispersion type two-color emission EL lamp according to a second embodiment of the present invention.

FIG. 3 is a cross-sectional view of a dispersion type two-color EL lamp according to a third embodiment of the present invention.

FIG. 4 is a sectional view of a dispersion type two-color emission EL lamp according to a fourth embodiment of the present invention.

FIG. 5 is a cross-sectional view of a dispersion type multicolor EL lamp according to a fifth embodiment of the present invention.

FIG. 6 is a sectional view of a dispersion type multicolor EL lamp according to a sixth embodiment of the present invention.

FIG. 7 is a cross-sectional view of a dispersion type multicolor EL lamp according to a seventh embodiment of the present invention.

FIG. 8 is a sectional view of a dispersion type multicolor EL lamp according to an eighth embodiment of the present invention.

FIG. 9 is an external perspective view of a conventional distributed two-color emission EL lamp.

FIG. 10 is a sectional view taken along line XX of FIG. 9;

FIG. 11 is a sectional view taken along line YY of FIG. 9;

[Explanation of symbols]

5, 20 Transparent substrate 6a, 6b, 6c Light transmitting electrode layer 7, 15, 23 Light emitting layer 8, 16 Dielectric layer 12, 19 Back electrode layer 13 Insulating protective layer 14a, 14b, 17a, 17b, 18a, 18b , 1
8c, 22a, 22b, 22c Color filter layer 21 Black opaque layer 24 Moisture absorbing sheet 25 Moisture proof sheet 26 Glass plate 27 Sealing adhesive 28 Space

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Kenji Morimoto 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F term (reference) 3K007 AB02 AB04 AB18 BA06 BB05 CA01 CB01 DA05 EA02 EB04 EC01 FA01

Claims (24)

[Claims] 1. A light-transmitting electrode layer in the form of a thin line stripe formed on a transparent substrate, and a light-transmitting color filter layer colored in two different colors on the light-transmitting electrode layer in the form of thin line stripe. The phosphor for EL of blue-green emission color and the blue-green emission color are colored red over the entire surface of the light-transmitting color filter layer colored in two different colors alternately and repeatedly formed in a stripe shape. A phosphor layer that emits substantially white light is formed by dispersing a fluorescent pigment to be converted, and a high-dielectric layer is formed by superimposing the phosphor layer on the phosphor layer. A two-color EL lamp having a back electrode layer. 2. A light-transmitting electrode layer in the form of a fine line stripe formed on a transparent substrate, and a light-transmitting color filter layer colored in two different colors on the light-transmitting electrode layer in the form of a fine line stripe. A light-emitting layer in which a blue-green light-emitting phosphor for EL is dispersed is formed on the light-transmitting color filter layer colored in two different colors alternately and repeatedly formed in a stripe shape. A fluorescent pigment for converting a blue-green luminescent color to red was dispersed on the luminescent layer,
A two-color EL lamp in which a highly dielectric dielectric layer capable of substantially converting the emission color of the light emitting layer to white emission color is formed, and a back electrode layer is formed on the dielectric layer. . 3. A light-transmitting electrode layer in the form of a thin line stripe formed on a transparent substrate, and a phosphor for EL of blue-green emission color on the entire surface of the light-transmitting electrode layer in the form of thin line stripe; A fluorescent pigment that converts a green emission color to a red color is dispersed, and a light-emitting layer that emits substantially white light is formed, and a high-dielectric dielectric layer is formed on the light-emitting layer, Further, a back electrode layer is formed so as to overlap with the dielectric layer, and light-transmitting colored in two different colors is provided at a position on the opposite surface of the transparent substrate corresponding to the light-transmitting electrode layer in the form of the fine line stripe. And a two-color emission EL lamp formed by alternately repeating the color filter layers in a stripe pattern. 4. A light-transmitting electrode layer in the form of a fine line stripe formed on a transparent substrate, and a phosphor for EL of blue-green emission color is dispersed on the entire surface of the light-transmitting electrode layer in the form of fine line stripe. A luminescent layer was formed, and a fluorescent pigment for converting a blue-green luminescent color to red was dispersed on the luminescent layer,
Forming a highly dielectric dielectric layer capable of substantially converting the emission color of the light emitting layer to white emission color, further forming a back electrode layer on the dielectric layer, and forming the thin line stripes A light-transmitting color filter layer colored in two different colors is alternately and repeatedly formed in a stripe shape at a position on the opposite surface of the transparent substrate corresponding to the light-transmitting electrode layer.
Color emitting EL lamp. 5. The method according to claim 1, wherein the light-transmitting electrode layer in the form of a fine wire stripe comprises
The two-color luminescent EL lamp according to any one of claims 1 to 4, which is connected to every other one on the same surface of the transparent substrate. 6. A light-transmitting electrode layer in the form of a thin line stripe formed on a transparent substrate, and a light-transmitting electrode layer colored in each of red, blue and green on the light-transmitting electrode layer in the form of a thin line stripe. A color filter layer is repeatedly formed in a stripe shape, and a blue-green EL light-emitting color is formed on the entire surface of the light-transmitting color filter layer colored with each of the red, blue, and green colors.
A phosphor layer that emits substantially white light is formed by dispersing a phosphor for use and a fluorescent pigment that converts this blue-green emission color into red, and a high dielectric A multicolor EL lamp in which a body layer is formed, and a back electrode layer is further formed on the dielectric layer. 7. A light-transmitting electrode layer in the form of a fine line stripe formed on a transparent substrate, and a light-transmitting electrode layer colored in each of red, blue, and green on the light-transmitting electrode layer in the form of a fine line stripe. A color filter layer is sequentially and repeatedly formed in a stripe shape, and an EL of blue-green emission color is formed on the entire surface of the light-transmitting color filter layer colored with each of the red, blue, and green colors.
A phosphor layer in which a phosphor is dispersed is formed, and a fluorescent pigment that converts the blue-green emission color to red is superposed on the phosphor layer, and the emission color of the phosphor layer is substantially changed. A multicolor light emitting EL lamp in which a highly dielectric dielectric layer capable of converting color into white emission color is formed, and a back electrode layer is further formed on the dielectric layer. 8. A light-transmitting electrode layer in the form of a thin line stripe formed on a transparent substrate, and a phosphor for EL of blue-green emission color on the entire surface of the light-transmitting electrode layer in the form of thin line stripe; A fluorescent pigment that converts a green emission color to a red color is dispersed, and a light-emitting layer that emits substantially white light is formed, and a high-dielectric dielectric layer is formed on the light-emitting layer, Further, a back electrode layer is formed so as to overlap the dielectric layer, and at positions on the opposite surface of the transparent substrate corresponding to the light-transmitting electrode layers in the form of the fine line stripes, each of the colors is colored in red, blue, and green. A multicolor EL lamp formed by sequentially repeating a light-transmitting color filter layer in a stripe shape. 9. A light-transmitting electrode layer in the form of a thin line stripe formed on a transparent substrate, and a phosphor for EL of blue-green emission color dispersed on the entire surface of the light-transmitting electrode layer in the form of thin line stripe. A phosphor pigment that converts the blue-green emission color to red is dispersed on the light-emitting layer, and the emission color of the emission layer is substantially converted to white emission color. Forming a high dielectric layer, and further forming a back electrode layer on the dielectric layer, and a position on the opposite surface of the transparent substrate corresponding to the light-transmitting electrode layer in the form of the fine line stripe. A multicolor EL lamp in which light-transmitting color filter layers colored in red, blue, and green are repeatedly formed in a stripe pattern. 10. The EL lamp according to claim 1, wherein the dielectric layer is white. 11. The EL lamp according to claim 3, wherein the dielectric layer is white. 12. The EL lamp according to claim 1, wherein the relative permittivity of the colored light-transmitting color filter layer is 6 or more. 13. The EL lamp according to claim 1, wherein the colored light-transmitting color filter layer is electrodeposited on the light-transmitting electrode layer. 14. The chromaticity of the luminescent color of the luminescent layer or the chromaticity of the luminescent color whose color is converted by reflected light of the dielectric layer and the luminescent color of the luminescent layer is substantially white is x-value. Both y values are 0.2
The EL lamp according to claim 1, wherein the number is 6 to 0.4. 15. The wiring pitch of the light-transmitting electrode layer in the form of a fine wire stripe is 0.05 to 0.5 mm.
5. The EL lamp according to any one of items 4 to 5. 16. The emission luminance ratio of each color of red: green: blue is 20 to 70 for red and 8 to 3 for blue when the green is 100.
The EL lamp according to any one of claims 6 to 15, wherein the EL lamp is 0. 17. The EL lamp according to claim 1, wherein the back electrode layer is formed in a fine line stripe shape perpendicular to the light transmissive electrode layer in a fine line stripe shape. 18. A light-transmitting or light-transmitting surface on one of the front and back surfaces of a transparent substrate corresponding to at least one of a gap between color filter layers formed in a fine line stripe and a gap between back electrode layers formed in a fine line stripe. A black opaque layer is formed on the light-transmitting color filter layer formed on the side opposite to the electrode layer, and viewed from the side opposite to the side on which the light-emitting layer, dielectric layer, and back electrode layer are formed In some cases, the black opaque layer is formed in a striped or grid pattern on the colored light-transmitting color filter layer formed in the shape of a thin wire stripe or in the gap between the layers.
18. The EL lamp according to any one of items 17 to 17. 19. The EL according to claim 1, wherein an insulating protective layer is formed on at least the back electrode layer.
lamp. 20. The EL lamp according to claim 1, wherein at least the luminescent layer is formed by dispersing a phosphor in a glass paste. 21. The EL lamp according to claim 1, wherein the entire surface except for the external connection electrode portion is sealed with a moisture-proof sheet. 22. The transparent substrate according to claim 1, wherein the transparent substrate is made of glass, and the entire surface except for the external connection electrode portion on the side on which the luminous body layer is formed is sealed with a glass plate. EL lamp. 23. The EL lamp according to claim 21, wherein a moisture-absorbing sheet is provided in the sealed state. 24. An AC voltage for selectively and automatically turning on the EL is individually and automatically applied to each of the light transmitting electrode layer of the EL lamp and the external extraction electrode of the back electrode layer by microcomputer control. An EL lamp unit using the EL lamp according to any one of claims 1 to 23, wherein the EL lamp can be cut off and intermittent.