JP2003068161A - El panel and key switch with el panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thin and low cost EL panel capable of illuminating a display membrane in multiple colors by switching, and a key switch using the panel. SOLUTION: In this key switch 1 with the EL panel, the EL panel 10 for illuminating a key pad 4 is disposed between a key pad 4 with light diffusivity and a switch 5 opened and closed by the operation of the key pad 4. The EL panel 10 comprises an opening 10A allowing the key pad 4 to be inserted therein and a plurality of light emitting layers 13a and 13b with different luminescent colors disposed on the peripheral surface of the opening 10 with no overlapping with each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an EL panel and a key switch with an EL panel using the same, and more particularly to a thin, low-cost EL panel and a key switch with an EL panel that can illuminate a display membrane by switching between a plurality of colors.

[0002]

2. Description of the Related Art E suitable for keys used in mobile phones and the like
The key switch 50 with an L panel has, for example, the appearance shown in the perspective view of the main part of FIG. 9, and a translucent keypad 52 is vertically movable in a plurality of openings 51A formed in an outer case 51. It is set up. A display membrane 53 is formed on the surface of the keypad 52. FIG. 10 shows E shown in FIG.
It is a principal part sectional view which follows the BB line of the key switch 50 with an L panel. The outer case 51 and the substrate 54 form a flat container. The switch 55 is formed on the substrate 54, and the switch 55 is provided between the outer case 51 and the substrate 54.
A keypad 52 that opens and closes, and an EL panel 56 that illuminates the display membrane 53 via the keypad 52 are housed. Since the keypad 52 is made of a resin (rubber or the like) having light diffusivity and flexibility, when the EL panel 56 emits light, the keypad 52 is illuminated, and the keypad 52 indirectly illuminates the display membrane 53. To be done.

The switch 55 includes a pair of contacts 55a, 55.
b, and a contact 55c that covers these contacts and has a pressure reversal portion. The contact 55c is formed by processing a conductive elastic plate into a dome shape. When the contact 55c is pressed downward, the contact 55c is deformed into a concave shape, and when the pressure is released, the contact 55c returns to its original shape. When the display membrane 53 is pressed with a finger or the like, the protrusion 52a formed on the keypad 52 comes into contact with the dome-shaped contact 55c,
When it is further pressed, the dome-shaped contact 55c is deformed to come into contact with the contacts 55a and 55b, and the switch 55 is turned on. When the finger is released, the contact 55c is separated from the contact by the restoring force of the elastic plate, and the switch 55 becomes non-conductive.

FIG. 11 is a partially cutaway perspective view showing the structure of the EL panel 56. The protrusion 52 of the keypad 52 is shown in FIG.
A plurality of openings 56A for inserting a are formed. In the EL panel 56, a transparent electrode 58 such as ITO is vapor-deposited on a transparent film 57, and a phosphor having a moisture-proof coating activated with zinc sulfide by copper is dispersed in a binder (for example, fluororubber). The layer 59 is screen-printed, and the reflective insulating layer 60 in which a white high-dielectric powder such as barium titanate is dispersed in a binder (for example, fluororesin) is screen-printed on the layer 59, and a conductive paste such as carbon paste is formed thereon. The back electrode 61 is formed by screen printing, the whole is covered with a protective layer 62 made of an insulating paste, and finally an opening 56A is punched to complete.

Since the color of light emitted from the EL panel 56 is a single color such as blue green or orange, the display membrane 53 of the key switch 50 with an EL panel is also illuminated in a single color. To improve the monotonous display, JP-A-2000-340060 discloses a key switch with an EL panel, which can cause the display membrane to emit light in a plurality of colors. This key switch 70 with EL panel is shown in FIG.
2, a box-shaped keypad 72 arranged so as to partially project from an opening 71A formed in a case 71, and a display membrane 73 formed on the surface thereof.
The keypad 72 includes a diffusion plate 74, two EL panels 75 and 76, which are laminated and arranged at regular intervals, a substrate 77, and a switch 78 formed on the substrate 77. The switch 78 includes contacts 78a and 78b and a pressing reversal portion 78c formed of a dome-shaped elastic member.

A large number of substantially circular through holes 75a are formed in the EL panel 75 arranged on the upper side so that a part of light emitted from the lower EL panel 76 is transmitted. Therefore, for example, when the EL panel 75 emits red light and the EL panel 76 emits green light, the display membrane 73 is illuminated in red when only the EL panel 75 is turned on. EL panel 7
When only 6 is turned on, the display membrane 73 is illuminated in green. When the EL panels 75 and 76 are turned on at the same time, the display membrane 73 is mixed with color and illuminated substantially white. In this way, the display color of the display membrane 73 can be switched to three colors.

[0007]

A key switch 70 with an EL panel capable of switching the display membrane 73 to a plurality of colors has a keypad 72 in which EL panels 75 and 76 of different emission colors are arranged in the vertical direction. There is the following problem because it is necessary to stack and arrange them in the operation direction of the keypad). (1) The keypad becomes thick, which is against the thinning. (2) Light loss increases due to stacking.
(3) When there are a plurality of keypads, a plurality of panels are required for each keypad, and the extraction of electrode leads and wiring are complicated. (4) Since a plurality of EL panels are incorporated, the number of key switch assembling steps is increased. (5) It is necessary to form a large number of through holes in a plurality of EL panels on the upper side except for the EL panel of the lowermost layer, which increases the cost.

Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to provide a key switch with an EL panel that can switch the display membrane to a plurality of colors and efficiently illuminate, and is thin and low cost. Is to provide. In addition, the thin and low cost E suitable for this type of key switch
It is to provide an L panel.

[0009]

In order to solve the above problems, the EL panel of the present invention comprises a plurality of ELs on a transparent substrate.
The element is formed in the surface direction, an opening is formed in the approximate center of each EL element, and a plurality of light emitting layers having different emission colors are formed around the opening without being polymerized, and reflective insulation is provided on the plurality of light emitting layers. A plurality of back electrodes having substantially the same shape as the light emitting layer are formed through the layers. According to this configuration,
It is possible to provide a thin, low-cost EL panel that is suitable for illuminating a key switch and that can switch emission colors.

Further, the EL panel of the present invention is characterized in that a plurality of light emitting layers are arranged in parallel along the circumference of the opening. According to this configuration, since the plurality of light emitting layers are compactly and well-balancedly arranged around the opening, the respective emission colors are well balanced and the level of color mixing is high.

Further, the EL panel of the present invention is characterized in that a plurality of light emitting layers are arranged in a concentric ring shape centering on the opening. According to this configuration, the symmetry of the arrangement of the plurality of light emitting layers is further improved, so that the balance of the emission colors in the circumferential direction is further improved, and the level of color mixing is further improved.

Further, in the EL panel of the present invention, the transparent electrodes of each EL element are common, and each back electrode corresponding to the light emitting layer of the same emission color of each EL element is connected and connected to the back electrode lead-out terminal. It is characterized by With this configuration, it is possible to easily and collectively switch the emission colors of the plurality of EL elements formed on one EL panel. Also,
The wiring is simple and the connection with the drive circuit is simple.

The key switch with EL panel of the present invention is
A key switch with an EL panel, in which an EL panel for illuminating the keypad is provided between a keypad having a light diffusing property and a switch that opens and closes by the operation of the keypad. A plurality of light emitting layers having different light emitting colors are formed on the peripheral surface of the opening, the plurality of light emitting colors are diffused and mixed by the keypad inserted in the opening, and the display membrane is illuminated by switching to a plurality of colors. And According to this structure, since the plurality of light emitting layers having different emission colors are arranged in the same plane in the surface direction, the thickness of the key switch becomes thin. Further, there is no light loss due to stacking. Further, since a plurality of light emitting layers are integrated into one EL panel, the man-hours for forming the transmission holes and the man-hours for assembling are reduced. Therefore, it is possible to provide a key switch with an EL panel, which can switch the display membrane to a plurality of colors and efficiently illuminate, and which is thin and low cost.

Further, the key switch with an EL panel of the present invention is characterized in that a plurality of light emitting layers are arranged side by side in the circumferential direction with respect to the axis of the keypad. According to this structure, since the plurality of light emitting layers are compactly and well-balancedly arranged around the keypad, the illumination effect on the display membrane is high.

Further, the key switch with an EL panel of the present invention is characterized in that a plurality of light emitting layers are arranged in a coaxial ring shape with the key pad as an axis. According to this configuration, the symmetry of the arrangement of the plurality of light emitting layers is further improved, so that the brightness distribution, color distribution, and color mixing purity of the display membrane are improved.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of a key switch with an EL panel of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a key part of an EL panel-equipped key switch capable of displaying three colors of light emission. In FIG. 1, a key switch 1 with an EL panel forms a flat container with an outer case 2 and a substrate 3, and a plurality of keypads 4, a plurality of key switches 5 and one EL panel 10 are housed inside. ing. In one EL panel 10, a plurality of EL elements are formed on the same surface as described later. More specifically, the light-diffusing keypad 4 (individual keypads are, for example, 4
(1), 4 (2), ... ) Is vertically movable. The keypad 4 includes a keypad body 4a, a connecting portion 4b that integrates adjacent keypads, a display membrane 4c, and a protrusion 4d. On the other hand, an EL panel 10 in which a key switch 5 is formed on the substrate 3 so as to correspond to the keypad 4, and a plurality of light emitting layers having different emission colors are arranged in parallel on the same surface between the keypad 4 and the substrate 3. Is provided. The protrusion 4d of the keypad 4 is vertically inserted through the opening 10A formed in the EL panel 10. Therefore, the axis of the keypad 4 and the light emitting surface of the EL panel 10 are at right angles. Since the keypad 4 is made of resin (rubber or the like) having light diffusivity and flexibility, when the EL panel 10 emits light, the keypad body 4a is illuminated,
The display membrane 4c is indirectly illuminated.

According to this structure, since the display membrane is illuminated by one thin EL panel in which a plurality of light emitting layers having different emission colors are arranged in the surface direction, the thin and low-cost EL panel capable of displaying in a plurality of colors. It is possible to provide an attached key switch. In particular, since only one EL panel is used, it is not necessary to assemble a plurality of EL panels.

Next, FIG. 2 is a main part plan view showing the shape and arrangement of the light emitting layer of the EL panel 10 suitable for the key switch with an EL panel of the present invention. However, in FIG. 2, the reflective insulating layer on the light emitting layer and the back electrode on the reflective insulating layer are not shown. FIG. 3 is a cross-sectional view of essential parts taken along the line AA of FIG. In FIG. 3, the reflective insulating layer 14 on the light emitting layer 13 and the back electrode 15 thereon are also illustrated. The EL panel 10 includes a plurality of EL elements 10 (1), 10 (2), ... On the key pad 4 on a transparent electrode 12 formed on a single transparent film 11.
They are formed at positions corresponding to (1), 4 (2), .... An opening 10A for inserting the protrusion 4d of the keypad 4 is formed at the center of each EL element. The EL element 10 (1) includes two light emitting layers 13a, 1
3b is formed on the transparent electrode 12 in a substantially half-moon shape that is symmetrical about the opening 10A. Light emitting layers 13a, 1
3b emits light of blue green and orange, respectively. Light emitting layer 13
a and 13b are juxtaposed on the same surface and are not laminated (polymerized). Further, the EL elements 10 (2), ... 10 (n)
The structure and the emission color are the same as those of the EL element 10 (1).

Next, FIG. 4 is a plan view of the principal part for explaining the shape and arrangement of the back electrode and an example of each electrode lead terminal.
On the reflective insulating layer 14, corresponding to the light emitting layers 13a and 13b, back electrodes 15a and 1 having substantially the same shape as the light emitting layer (not shown) are formed.
5b is formed. EL elements 10 arranged in the lateral direction
(1), 10 (2), ...
Back electrodes 15a, 15a, ... Corresponding to a, 13a ,.
Are electrically connected by a connecting portion 15a 'and are integrated into the back electrode lead-out terminal 15A. Similarly, the light emitting layer 1 showing the other same emission color of each EL element arranged in the lateral direction.
Back electrodes 15b, 15b corresponding to 3b, 13b, ...
Are also electrically connected by the connecting portion 15b ', and are integrated into the back electrode lead-out terminal 15B. Back electrode 15
The a and 15b, the connecting portions 15a 'and 15b', and the back electrode lead terminals 15A and 15B are collectively formed by screen printing using a conductive paste such as carbon or silver. On the other hand, the transparent electrode lead-out terminal 12A is a common terminal that conducts with the transparent electrodes of all the EL elements. A transparent electrode exposed portion where the reflective insulating layer 14 is not formed is provided on a part of the transparent electrode 12, and a conductive land such as silver paste is screen-printed to form the terminal 12A. One terminal 12A may be provided, or a plurality of terminals 12A may be provided. Since a plurality of back electrodes, connecting portions, terminals, etc. corresponding to a plurality of light emitting layers can be collectively formed in this manner, the size and cost are reduced.

Next, the display color of the key switch 1 with an EL panel will be described. In the rear electrode arrangement shown in FIG. 4, a plurality of EL elements connected in the lateral direction are set as one group, and the emission color can be switched for each group. The emission colors of the EL elements in the group are the same. So E
When the drive switch of the L panel 10 (a switch different from the above key switch 5 and not shown) is turned on to light only the light emitting layer 13a, each EL element 10 (1), 10 (2) of the EL panel 10 is turned on. , ... Simultaneously emit light in blue-green, and the light is diffused by the keypad body 4a, so that each display membrane 4c is illuminated in blue-green. In addition, the light emitting layer 1
When only 3b is turned on, each of the EL elements 10 (1), 10
(2), ... Emit orange, and the display membrane 4c is illuminated orange. When the light emitting layers 13a and 13b are turned on at the same time, blue light and orange light are emitted at the same time, and the display membrane 4c is illuminated in a uniform bluish white by diffusing and mixing in the keypad body 4a. As described above, according to this configuration, one thin EL panel can switch the display surface to three colors (blue green, orange, and bluish white) to emit light. When the brightness differs depending on the phosphor, the brightness can be balanced by changing the areas, thicknesses, etc. of the light emitting layers 13a and 13b.

Further, the EL elements can be connected in the vertical direction to form one group, and the emission color can be switched for each vertical group, or the emission colors of all the EL elements can be switched simultaneously by connecting all the vertical and horizontal directions. . In particular, the emission color of each EL element can be independently controlled by extracting the back electrode independently from each EL element. Further, the key switch 5 and the drive switch of the EL panel 10 may be interlocked with each other to configure an electric circuit so as to control the color of light emitted from the display membrane 4c by operating the key switch 5.

Next, another example of the shape of the light emitting layer and the shape of the back electrode will be described. FIG. 5 shows a light emitting layer 13 that emits different colors.
This is an example in which c and 13d are arranged in a concentric (coaxial) ring shape. Corresponding back electrodes 15c and 15d are also, as shown in FIG.
Make concentric (coaxial) ring. However, the outer back electrode 15
This is a structure in which a slit is formed in a part of c and the inner back electrode 15d is led out via the slit without short-circuiting. Since the concentric (coaxial) annular arrangement is excellent in the axial symmetry of light emission, the brightness uniformity of the display membrane 4c is good. Also,
Excellent color mixing and high white level.

Next, a method of manufacturing the EL panel 10 will be described with reference to FIG.
This will be described with reference to FIGS. On a transparent electrode 12 such as ITO formed on the transparent film 11, a blue-green phosphor (for example, ZnS: Cu, Cl (Cu concentration adjustment)) is used in an ink in which fluororubber is dispersed, Screen-printed in a substantially half-moon pattern (diagonal lines) to form the light emitting layer 13a
To form. Next, on the other part of the transparent electrode 12, a phosphor (for example, ZnS: Cu, Mn) that emits orange light is dispersed in fluororubber and screen-printed in an inverted half-moon pattern using an ink. To form. Next, the reflective insulating layer 14 in which a white high dielectric powder such as barium titanate is dispersed in a fluororesin is screen-printed on the light emitting layer and the transparent electrode. Next, the back electrodes 15a and 15b made of a conductive paste such as carbon paste are attached to the light emitting layer 1.
Screen printing is performed in the substantially same shape as 3a and 13b. At the same time, the back electrode connecting portions 15a 'and 15b', the back electrode lead terminals 15A and 15B, and the transparent electrode lead terminal 12A are also collectively formed. Next, the rear electrode lead-out terminals 15A, 15B,
The insulating paste is screen-printed in a pattern that avoids the transparent electrode lead terminals 12A to form the protective layer 16. Finally, the EL panel 10 is completed by punching a plurality of openings 10A at positions corresponding to the protrusions 4d of the key pad 4.

Next, a second embodiment of the key switch with an EL panel of the present invention will be described with reference to the drawings.
This embodiment realizes further multicoloring by using an EL panel having an increased number of light emitting layers.
Except for the EL panel, it is the same as in the first embodiment, and redundant description will be omitted. E used in the second embodiment
In the L panel 20, as shown in the plan view of the main part of FIG. 7, a green light emitting layer 23a, an orange light emitting layer 23b, and a blue light emitting layer 23c are formed on the transparent electrode 12 in the opening 10.
It is characterized in that they are arranged side by side around A. It is needless to say that the shape of the back electrode is divided into three corresponding to the shape of the light emitting layer, although not particularly shown. According to this structure, more light emitting layers having different emission colors than those in the first embodiment are arranged in the surface direction, so that a thin, low-cost key with an EL panel capable of displaying more colors can be displayed.
A switch can be provided.

The manufacturing method of the EL panel 20 is the same as the manufacturing method of the EL panel 10 of the first embodiment except for the light emitting layer forming step, and thus the duplicate description will be omitted. In the light emitting layer forming step, first, an ink in which a fluorescent substance that emits green light (for example, ZnS: Cu, Cl (Cu concentration adjustment)) is dispersed in fluororubber on the transparent electrode 12 is used to form the pattern shown in FIG. Is screen-printed to form the light emitting layer 23a. Next, on the other part of the transparent electrode 12, a phosphor (for example, ZnS: Cu, Mn) that emits orange light is dispersed in fluororubber to be screen printed to form a light emitting layer 23b. Next, on another portion of the transparent electrode 12, a phosphor (for example, ZnS: Cu, Cl (Cu concentration adjustment)) that emits blue light is screen-printed using an ink dispersed in fluororubber, and the light emitting layer 23c is formed. To form.

Next, the display color of the key switch with an EL panel according to the second embodiment will be described. EL panel 2
When the drive switch of 0 (a switch different from the above key switch 5 and not shown) is turned on and only the light emitting layer 23a is turned on, each EL element 20 of the EL panel 20 is turned on.
(1), 20 (2), ... Simultaneously emit green light, the light is diffused by the keypad body 4a, and each display membrane 4c is illuminated in a uniform green color. When only the light emitting layer 23b is turned on, the EL elements 20 (1), 20
(2), ... Emit orange, and the display membrane 4c is illuminated uniformly orange. When only the light emitting layer 23c is turned on, the EL elements 20 (1), 20 (2), ... Emit blue light, and the display membrane 4c is illuminated in uniform blue light.

When the light emitting layers 23a and 23b are turned on at the same time, green and orange are simultaneously emitted, and the keypad body 4a diffuses and mixes the colors to illuminate the display membrane 4c in a uniform yellowish white color. When the light emitting layers 23b and 23c are turned on at the same time, orange and blue light are emitted simultaneously, and the display membrane 4c is illuminated in a uniform bluish white color by diffusing and mixing in the keypad body 4a. When the light emitting layers 23c and 23a are turned on at the same time, green and blue light are emitted simultaneously, and the display membrane 4c is illuminated in a uniform blue-green color by diffusing and mixing in the keypad body 4a. In addition, the light emitting layers 23a, 23b, 23
When c is turned on at the same time, green, orange, and blue are simultaneously emitted, and the display membrane 4c is illuminated in a substantially white color by diffusing and mixing in the keypad body 4a. According to this configuration, one thin EL panel can switch and illuminate the display surface in seven colors (green, orange, blue, yellow white, bluish white, turquoise, and substantially white). If the number of light emitting layers is increased, it is possible to achieve more colors. Further, by lighting each of the light emitting layers by an independent drive circuit, the display surface can be made to emit light in multiple colors.

As a modification of the shape of the light emitting layer, as shown in FIG. 8A, light emitting layers 23d, 23e and 23f having different emission colors can be arranged in a concentric (coaxial) ring shape. Corresponding back electrodes 25d, 25e, 25f are also formed in a concentric (coaxial) ring shape as shown in FIG. 8B. At that time, the back electrode 2
The slits 5e and 25f are provided so that the inner electrodes can be led out without short-circuiting. 25D, 25E, and 25F are take-out terminals. Since the concentric (coaxial) annular arrangement has excellent axial symmetry of light emission, the brightness uniformity of the display membrane is good. It also has excellent color mixing and a high white level.

The embodiment of the present invention such as the shape of the light emitting layer, the shape of the back electrode, the shape of the electrode lead-out terminal, the color of light emission, etc. is not limited to the above.

[0030]

The EL panel of the present invention is an EL panel in which a plurality of EL elements are juxtaposed in the surface direction on a transparent substrate, and an opening is formed at substantially the center of each EL element, and the periphery of the opening is formed. A plurality of light emitting layers having different emission colors are disposed without being polymerized, and a plurality of back electrodes having substantially the same shape as the light emitting layer are formed on the plurality of light emitting layers via a reflective insulating layer. To do. With this configuration, it is possible to provide a thin, low-cost EL panel suitable for a key switch and capable of switching the emission color.

Further, the key switch with an EL panel of the present invention is equipped with an EL panel in which a plurality of light emitting layers having different emission colors are juxtaposed on the same surface without overlapping, so that the key switch becomes thin. Further, there is no light loss due to stacking. Further, since a plurality of light emitting layers are integrated into one EL panel, the man-hours for forming the transmission holes and the man-hours for assembling are reduced. Therefore, it is possible to provide a key switch with an EL panel that can switch the display membrane to a plurality of colors and illuminate efficiently, and that is thin and low cost.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a key switch with an EL panel according to a first embodiment of the present invention.

FIG. 2 is a plan view of a main part for explaining the shape and arrangement of a light emitting layer of the EL panel of FIG.

FIG. 3 is a sectional view of a main part taken along the line AA of FIG.

FIG. 4 is a plan view of the principal part for explaining the back electrode shape and electrode extraction of the EL panel of FIG.

FIG. 5 is a plan view of an essential part showing a modified example of the shape of a light emitting layer.

6 is a back electrode shape corresponding to the light emitting layer shape of FIG. 5,
Main part plan view explaining electrode extraction

FIG. 7 shows a shape of a light emitting layer of an EL panel mounted on a key switch with an EL panel according to a second embodiment of the present invention,
Main part plan view explaining the layout

FIG. 8 is a plan view of a principal part showing a modified example (a) of a light emitting layer shape and a corresponding back electrode shape (b).

FIG. 9 is a perspective view of a main part of a conventional key switch with an EL panel.

FIG. 10 is a cross-sectional view of essential parts taken along the line BB of FIG.

FIG. 11 is a partially cutaway perspective view of a conventional EL panel (single color).

FIG. 12 is a conventional key with an EL panel capable of multicoloring.
Sectional view of switch

[Explanation of symbols]

1 Key Switch with EL Panel 2 Exterior Case 3 Substrate 4 Keypad 4a Keypad Body 4b Connection 4c Display Membrane 4d Protrusion 5 Keyswitch 5a, 5b Contact 5c Contact 10 and 20 EL Panel 10 (1) 10 (2), 20 (1), 20 (2) E
L element 10A Opening 11 Transparent film 12 Transparent electrode 12A Transparent electrode extraction terminals 13, 13a, 13b, 13c, 13d, 23a, 23
b, 23c, 23d, 23e, 23f Light emitting layer 14 Reflective insulating layers 15, 15a, 15b, 15c, 15d, 25d, 25
e, 25f Back electrodes 15a ', 15b' Back electrode connecting portions 15A, 15B, 15C, 15D, 25D, 25E, 2
5F Rear electrode extraction terminal 16 Protective layer

Claims (7)

[Claims] 1. A plurality of EL elements are formed in a surface direction on a transparent substrate, an opening is formed at substantially the center of each EL element, and a plurality of light emitting layers having different emission colors are not polymerized around the openings. A plurality of back electrodes having substantially the same shape as the light emitting layer are formed on the plurality of light emitting layers with a reflective insulating layer interposed therebetween.
L panel. 2. The EL panel according to claim 1, wherein the plurality of light emitting layers are arranged in parallel along the circumference of the opening. 3. The EL panel according to claim 1, wherein the plurality of light emitting layers are arranged in a concentric ring shape centering on the opening. 4. The transparent electrode of each EL element is common and each E element is
The EL panel according to claim 1, wherein the back electrodes corresponding to the light emitting layers of the same light emission color of the L element are connected and connected to the back electrode lead-out terminal. 5. A key switch with an EL panel in which an EL panel for illuminating the keypad is arranged between a keypad having a light diffusing property and a switch which is opened and closed by the operation of the keypad. A plurality of light emitting layers having different light emitting colors are formed on the peripheral surface of the opening formed in the panel, the keypad is inserted into the opening, the plurality of light emitting colors are diffused and mixed by the keypad, and the display membrane has a plurality of colors. The key switch with EL panel is characterized by being switched to and illuminated. 6. The key switch with an EL panel according to claim 5, wherein the plurality of light emitting layers are arranged side by side in the circumferential direction with respect to the axis of the keypad. 7. The key switch with an EL panel according to claim 5, wherein the plurality of light emitting layers are coaxially arranged with the keypad as an axis.