JP2008269988A - Organic el panel for lighting - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an organic EL panel for lighting capable of improving connection accuracy and reliability between a sandwiching auxiliary electrode and an element electrode. <P>SOLUTION: The organic EL panel 1 for lighting has a transparent substrate 11 formed by laminating EL light-emitting layers, an element electrode 12 led to the outer periphery of the rear surface of the transparent substrate 11, an auxiliary electrode 13 connected with the element electrode 12 by butting and supplying power from the outside, and a sealing section 14 protecting the EL light-emitting layer by sealing. The auxiliary electrode 13 has a first contact section 13f brought into contact with the transparent substrate 11 at a plane state, a second contact section 13s arranged by facing to the first contact section 13f and brought into contact with the element electrode 12 at a plane state, and a connecting section 13b for sandwiching the transparent substrate 11 and element electrode 12 by connecting the first contact 13f and second contact section 13s. The second contact section 13s is formed by a partition plate section 13sd partitioned to the first contact section 13f. The connecting section 13b has an elastic curved section 13bc having elasticity at a side connected with the second contact section 13s. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an organic EL panel for illumination to which an electroluminescence (EL) element including an auxiliary electrode is applied.

  In recent years, the development of EL elements, especially organic EL elements, has been attracting attention as a planar light source. An organic EL element sandwiches an organic thin film containing a fluorescent organic compound between a positive electrode and a negative electrode as an EL light emitting layer, and injects electrons and holes (holes) from each electrode into the organic thin film. The light emitted when the excited electrons return to the ground state is extracted to the outside.

  In such an EL element, it is necessary to form a planar electrode, to extract light from the EL light emitting layer to the outside, to form an organic thin film, to improve moisture resistance, and so on. A glass substrate is generally used as the substrate and the sealing portion. The glass substrate used as the transparent substrate and the sealing portion is formed as thin as possible in order to improve the productivity of the EL element, and is usually as thin as several mm.

  In addition, since it is necessary to extract light from the EL light emitting layer to the outside, a transparent electrode is used as an electrode (element electrode). As the transparent electrode (element electrode), ITO (indium tin oxide) is generally used because of its good transparency and easy manufacture.

  ITO used as an element electrode is a conductor, but has a high resistivity, and a voltage drop due to the resistance of the ITO is large when power is supplied from a local connection with an external terminal. Since it decreases as the distance from the connection point increases, there are problems such as luminance variation and the fact that a large area cannot be constructed.

  In order to solve the problem of high resistance of ITO and to obtain a light source body that emits light in a large area, an organic EL panel for illumination using an auxiliary electrode opposed to and in contact with an element electrode has been proposed. For example, an organic EL panel for illumination using a plate-like conductor as an auxiliary electrode (for example, see Patent Document 1) or an organic EL panel for illumination using a wiring board as an auxiliary electrode (for example, see Patent Document 2) is known. It has been. Patent Documents 1 and 2 disclose that, for example, a conductive adhesive is applied to the connection between the element electrode and the auxiliary electrode. Patent document 3 etc. are known as an example which disclosed the other auxiliary electrode.

  The conductive adhesive applied between the element electrode and the auxiliary electrode adheres the element electrode and the auxiliary electrode. However, the adhesion may not be sufficient and may peel off or cause a cavity. When the adhesion of the auxiliary electrode to the element electrode by the conductive adhesive is not sufficient, the auxiliary electrode cannot sufficiently perform its function, and the influence due to the high resistance of ITO cannot be reduced, There is a problem that a high-luminance light-emitting surface having sufficient uniformity cannot be realized.

  On the other hand, an auxiliary electrode or a connection mechanism has been proposed in which the element electrode is sandwiched without applying a conductive adhesive between the element electrode and the auxiliary electrode (see, for example, Patent Document 4 and Patent Document 5). ).

  FIG. 6 is a plan view showing a conventional sandwich-type auxiliary electrode applied to a planar light source body. FIG. 7 is an explanatory view for explaining a state in which the auxiliary electrode of the planar light source body shown in FIG. 6 is sandwiched, and (A) is an end view showing an end face of a cross section taken along arrows XX in FIG. (B) is an end view which shows the end surface of the cross section by the arrow YY of FIG. 6, (C) is an end view which shows the clamping defect state of (B).

  The planar light source body 101 includes an electrode 112 at the peripheral edge of the light source main body 111, and the electrode 112 is configured to be sandwiched between auxiliary electrodes 113 having elasticity (spring property). That is, the auxiliary electrode 113 is in contact with the electrode 112 by being in pressure contact with each other, and is configured to achieve mutual conduction. Therefore, it is possible to establish conduction between the electrode 112 and the auxiliary electrode 113 without using a conductive adhesive.

  However, when the area of the planar light source body 101 is increased, the length of the end portion is increased, and the length of the auxiliary electrode 113 is increased, it is difficult to accurately configure the holding structure. For example, when one side of the planar shape of the light source body 111 is very long, the thickness of the light source body 111 is about several millimeters at most in the case of an organic EL element, so the processing accuracy of the sandwich structure is very high. Higher ones are required.

  Therefore, when there is a processing variation (processing failure) or an elastic variation, as shown in FIG. 7C, the auxiliary electrode 113 is in contact with the element electrode 112 only in part and is not contacted as a whole. It may become a state. That is, since the auxiliary electrode 113 is not normally in contact with the element electrode 112, power supply from the outside is not normally performed, and light emission variation due to voltage drop due to the resistance of the element electrode 112 occurs. Become.

  Further, if the clamping pressure is increased so as to force the entire auxiliary electrode 113 into contact with the device electrode 112, a large pressure is locally applied to the device electrode 112 and the light source body 111, such as glass. There is a risk that the light source body 111 formed of a transparent substrate may be cracked or cracked, resulting in a decrease in reliability.

  As described above, the glass substrate used as the element substrate and the sealing substrate is configured to be as thin as possible in order to improve the productivity of the EL light emitting element, and is usually as thin as several mm. Therefore, the conventional EL light emitting device has problems such as being easily affected by an external force due to its low mechanical strength, being easily damaged, and having a large area.

In addition, ITO used as an element electrode is a conductor, but has high resistivity, and a voltage drop due to ITO resistance is large when power is supplied from a local connection with an external terminal, and is supplied to the EL light emitting layer. Since the power decreases as the distance from the connection point increases, there are problems such as luminance variations and the fact that a large area cannot be constructed.
JP 2006-228457 A JP 2006-228456 A JP 2006-202717 A JP 2005-174926 A Japanese Utility Model Publication No. 63-6664

  The present invention has been made in view of such a situation. The auxiliary electrode for supplying electric power from the outside to the element electrode is used as the holding type, and the abutting portion that comes into contact with the element electrode is divided so that the holding auxiliary electrode is sandwiched. Disperses the pressure applied to the transparent substrate and the device electrode due to the pressure, and presses the device electrode and the auxiliary electrode uniformly and with high precision in the side direction of the transparent substrate, thereby improving the connection accuracy and reliability between the auxiliary electrode and the device electrode. An object is to provide an organic EL panel for lighting.

  An illumination organic EL panel according to the present invention includes a transparent substrate having a light emission surface, a sealing portion disposed on the opposite side of the light emission surface to face the transparent substrate, and an outer periphery of the sealing portion. An organic EL panel for illumination comprising an element electrode led out and disposed on the transparent substrate, and an auxiliary electrode that contacts the element electrode and supplies electric power from the outside, wherein the auxiliary electrode is a side of the transparent substrate A first abutting portion that extends in a direction and contacts the transparent substrate in a planar shape, a second abutting portion that is disposed opposite the first abutting portion and contacts the element electrode in a planar shape, and A first contact portion and a second contact portion for connecting the transparent substrate and the element electrode, and the second contact portion is divided with respect to the first contact portion. The connecting portion has an elastic bending portion on the side connected to the second abutting portion. And wherein the Rukoto.

  With this configuration, it is possible to disperse and reduce the pressure applied to the transparent substrate and the element electrode by the sandwich-type auxiliary electrode, and to press-contact the element electrode and the auxiliary electrode uniformly and with high accuracy in the side direction of the transparent substrate. Therefore, the connection accuracy and reliability between the auxiliary electrode and the element electrode can be improved. In addition, since the elastic curved portion is provided on the second contact portion side, it is possible to secure flatness on the light emitting surface side, to make the auxiliary electrode thin, and to make the lighting organic EL panel thin. .

  In the organic EL panel for illumination according to the present invention, the height of the elastic curved portion from the transparent substrate is lower than the height of the sealing portion.

  With this configuration, it is possible to surely reduce the thickness (outer shape) of the entire organic EL panel for illumination.

  In the lighting organic EL panel according to the present invention, the connecting portion has a connection hole for connecting a lead wire led out to the outside.

  With this configuration, the flatness of the first contact portion and the second contact portion is ensured with high accuracy, and the space formed by the connecting portion is effectively utilized while the adhesion of the auxiliary electrode to the element electrode is improved. can do.

  In the organic EL panel for illumination according to the present invention, the elastic bending portion is formed by being bent or refracted.

  With this configuration, the elastic bending portion can be easily configured.

  Moreover, in the organic EL panel for illumination according to the present invention, the width of the divided plate portion is 5 times or more than the cutting width formed by the adjacent divided plate portion.

  With this configuration, variation in potential due to resistance of the element electrode can be reliably suppressed.

  According to the organic EL panel for illumination according to the present invention, the sandwich-type auxiliary electrode is opposed to the first contact portion, the first contact portion that extends in the side direction of the transparent substrate and contacts the transparent substrate in a planar shape. A second contact portion that is arranged in plane with the device electrode, and a connection portion that connects the first contact portion and the second contact portion to sandwich the transparent substrate and the device electrode. The two abutting parts are divided plate parts divided with respect to the first abutting part, and the connecting part has an elastic curved part on the side connected to the second abutting part. Since the element electrode and the auxiliary electrode can be pressed into contact with each other uniformly and with high accuracy by the sandwiching pressure dispersed in the step, the connection accuracy and reliability between the auxiliary electrode and the element electrode can be improved. . In addition, since the elastic curved portion is formed on the second contact portion side, it is possible to ensure flatness on the light emitting surface side, to make the auxiliary electrode thin, and to make the lighting organic EL panel thin. The effect of becoming.

  Hereinafter, an organic EL panel for illumination according to an embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a plan view of an illuminating organic EL panel according to an embodiment of the present invention as seen from the sealing portion side. 2 is an explanatory view for explaining a cross-sectional structure of the lighting organic EL panel shown in FIG. 1, and (A) is an end view showing an end face of the cross section taken along arrows XX in FIG. B) is an end view showing an end surface of a cross section taken along arrows Y-Y in FIG. 1. FIG. 3 is a perspective view showing an auxiliary electrode applied to the lighting organic EL panel shown in FIG.

  The organic EL panel 1 for illumination according to the present embodiment includes a transparent substrate 11 formed by laminating an EL (electroluminescence) light emitting layer (not shown), and a back surface (light emitting surface (light emitting surface)) of the transparent substrate 11. 11d is the element electrode 12 (a positive element electrode 12p to which a positive potential is applied and a negative element electrode to which a negative potential is applied) derived from the outer periphery of the EL light emitting layer on the opposite side of 11d. Hereinafter, when it is not necessary to distinguish the plus element electrode 12p and the minus element electrode 12m, they are simply referred to as the element electrode 12). The auxiliary electrode 13 is composed of a positive auxiliary electrode 13p connected to the positive element electrode 12p and a negative auxiliary electrode 13m connected to the negative element electrode 12m. , When it is not necessary to distinguish between the positive auxiliary electrode 13p and the negative auxiliary electrode 13m it is simply referred to as the auxiliary electrode 13.) Includes a sealing portion 14 to protect seal the EL light-emitting layer.

  As described above, the lighting organic EL panel 1 includes the transparent substrate 11 and the sealing portion 14 disposed to face each other, and an EL light emitting layer is formed inside the sealing portion 14. A positive hole transport layer (not shown) is formed on the plus side and an electron transport layer (not shown) is formed on the minus side with the EL light emitting layer interposed therebetween. An organic EL element is composed of an organic EL molecule in the EL light emitting layer.

  The organic EL panel 1 for illumination can be driven with a low voltage and a low current by using an organic EL element, and the organic EL panel 1 for illumination has high emission luminance with respect to supplied power and good luminous efficiency. Can do. In addition, various things are proposed about internal structures, such as the EL light emitting layer of the organic EL panel 1 for illumination, the positive hole transport layer laminated | stacked on an EL light emitting layer, and an electron carrying layer, It is not restricted to the structure mentioned above. Absent.

  The transparent substrate 11 is made of, for example, a glass substrate because it is required to be transparent in order to extract light from the light emitting surface 11d to the outside and the element electrode 12 needs to be formed.

  The device electrode 12 is led out along the outer periphery (side) of the sealing portion 14 on the back surface of the transparent substrate 11 facing the sealing portion 14. Since the element electrode 12 is required to be transparent, it is made of, for example, ITO (indium tin oxide), and the element electrode 12 has at least two electrodes having different polarities (plus and minus) (the plus element electrode 12p and the minus described above). Element electrodes 12m) are respectively formed.

  The positive auxiliary electrode 13p configured in a clip shape (clamping type) is disposed to face the positive element electrode 12p and is in contact with each surface of the transparent substrate 11 and the positive element electrode 12p and connected to the positive element electrode 12p ( Pressure contact). Similarly to the plus auxiliary electrode 13p, the minus auxiliary electrode 13m configured in a clip shape is disposed along the minus element electrode 12m and is in contact with each surface of the transparent substrate 11 and the minus element electrode 12m to be the minus element electrode. Connected to 12m (pressure contact).

  Note that the element electrodes 12 arranged on two opposite sides of the outer periphery of the sealing portion 14 have the same polarity. With this configuration, since the same potential can be applied in correspondence with the opposite sides of the light emitting surface 11d, the organic EL panel for lighting 1 capable of emitting light in a large area that eliminates power supply variation and suppresses luminance variation. It becomes possible.

  The auxiliary electrode 13 extends in the side direction of the transparent substrate 11 and is in contact with the transparent substrate 11 in a planar shape. The auxiliary electrode 13 is disposed to face the first contact portion 13f and is planar with the element electrode 12. A second abutting portion 13s that comes into contact with the first abutting portion 13f and the second abutting portion 13s and a connecting portion 13b that sandwiches the transparent substrate 11 and the element electrode 12 are provided.

  Further, the second contact portion 13s is constituted by a divided plate portion 13sd divided with respect to the first contact portion 13f. In the present embodiment, the first contact portion 13f is divided into five second contact portions 13s. Moreover, the connection part 13b is set as the structure which has the elastic bending part 13bc which gave elasticity (spring property) to the side connected with the 2nd contact part 13s.

  That is, the auxiliary electrode 13 makes the first contact portion 13f contact (contact) the transparent substrate 11 and the second contact portion 13s contact the element electrode 12 (contact) due to the elasticity of the elastic curved portion 13bc. It is possible to make it. Therefore, the auxiliary electrode 13 is connected (pressure contact) to the element electrode 12 with the transparent substrate 11 and the element electrode 12 interposed therebetween.

  Moreover, since the connection part 13b is provided with the elastic bending part 13bc on the side which connects with the 2nd contact part 13s, it becomes possible to accommodate the elastic bending part 13bc using the height of the sealing part 14. FIG. . Therefore, even when the elastic curved portion 13bc is provided, the lighting organic EL panel 1 can be thinned.

  Since the auxiliary electrode 13 only needs to press-connect (connect) the second contact portion 13s and the element electrode 12 within the range of the width W1 of the divided second contact portion 13s (divided plate portion 13sd). It becomes possible to uniformly disperse and reduce the clamping pressure necessary for reducing the contact resistance, and to increase the allowable range of processing accuracy for the auxiliary electrode 13.

  Therefore, since the clamping strength (elasticity) required for the connecting portion 13b (elastically curved portion 13bc) may be a small clamping pressure corresponding to the small area (divided plate portion 13sd) of the second contact portion 13s, it is an absolute value. As a result, a sufficient clamping strength can be secured with a small value, and a large clamping pressure that causes damage to the transparent substrate 11 and the device electrode 12 can be eliminated.

  It is desirable that the first contact portion 13f, the second contact portion 13s, and the connecting portion 13b are integrally formed by sheet metal processing. The elastic bending portion 13bc is formed by bending the connecting portion 13b in an arc shape. Therefore, the elastic bending portion 13bc can be easily processed, and the auxiliary electrode 13 can be formed at a low cost.

  The auxiliary electrode 13 has a connection hole 13h in the connecting portion 13b for connecting a lead wire led out to the outside. With this configuration, the connecting portion 13b is formed in a state where the flatness of the first contact portion 13f and the second contact portion 13s is ensured with high accuracy and the adhesion of the auxiliary electrode 13 to the element electrode 12 is improved. Space can be used effectively. Therefore, it is possible to easily supply external power to the device electrode 12.

  The width W1 of each divided portion (divided plate portion 13sd) of the second contact portion 13s is set to be five times or more than the cutting width W2 formed between the adjacent divided plate portions 13sd. With this configuration, the cutting width W2 can be limited to a small value and can be substantially ignored, and variation in potential in the side direction of the transparent substrate 11 due to the resistance of the element electrode 12 can be reliably reduced and suppressed. Become.

  In the lighting organic EL panel 1, the height H2 of the elastic curved portion 13bc from the transparent substrate 11 is lower than the height H1 of the sealing portion 14 from the transparent substrate 11. With this configuration, the entire thickness (outer shape) of the lighting organic EL panel 1 can be surely reduced.

  The auxiliary electrode 13 can be formed by applying a metal plate having high conductivity and spring property such as stainless steel. The plate thickness of the auxiliary electrode 13 can be set to, for example, about 0.5 mm to about 1 mm. Since the auxiliary electrode 13 is made of a metal plate such as stainless steel, it is possible to ensure extremely high conductivity (low resistivity) as compared with ITO as the element electrode 12, and the side of the element electrode 12. A uniform voltage can be applied to the device electrode 12 in the direction along the line (side direction).

  In other words, the influence of the voltage drop due to the resistance in the side direction of the element electrode 12 can be prevented and a uniform voltage can be applied to the element electrode 12, so that even power can be supplied to the EL light emitting layer. Therefore, it is possible to prevent the occurrence of luminance variations.

  Further, since the side (second contact portion 13s) corresponding to the element electrode 12 of the auxiliary electrode 13 is divided and configured by the divided plate portion 13sd, the connecting portion 13b (elastically curved portion 13bc) may have a small clamping strength. Since the influence of the length in the side direction of the transparent substrate 11 can be eliminated, the lighting organic EL panel 1 having the large-area light emission surface 11d can be obtained.

  As described above, the lighting organic EL panel 1 according to the present embodiment includes the transparent substrate 11 having the light emission surface 11d and the sealing portion disposed opposite to the transparent substrate 11 on the opposite side of the light emission surface 11d. 14, an organic EL panel 1 for illumination that includes an element electrode 12 led to the outer periphery of the sealing portion 14 and disposed on the transparent substrate 11, and an auxiliary electrode 13 that contacts the element electrode 12 and supplies power from the outside. The auxiliary electrode 13 extends in the side direction of the transparent substrate 11 and is in contact with the transparent substrate 11 in a planar shape. The auxiliary electrode 13 is disposed so as to face the first contact portion 13f. A second contact portion 13s that makes contact in a planar manner, and a connection portion 13b that connects the first contact portion 13f and the second contact portion 13s to sandwich the transparent substrate 11 and the element electrode 12; The contact portion 13s is separated from the first contact portion 13f. Yes and, connecting portion 13b is characterized by having an elastic curved portion 13bc on the side connected to the second contact portion 13s.

  With this configuration, the pressure by the auxiliary electrode 13 on the transparent substrate 11 and the element electrode 12 is reduced, and the element electrode 12 and the auxiliary electrode 13 can be contacted uniformly and reliably in the side direction of the transparent substrate 11. The contact accuracy and reliability between the auxiliary electrode 13 and the element electrode 12 can be improved. Further, since the elastic curved portion 13bc is formed on the second contact portion 13s side (sealing portion 14 side), the auxiliary electrode 13 is thinned by ensuring flatness on the light emitting surface 11d side. It is possible to reduce the thickness of the organic EL panel 1 for use.

  Further, since the element electrode 12 and the auxiliary electrode 13 are connected not by adhesion with a conductive adhesive or the like but by mechanical pressure bonding by elasticity, a problem occurs in the EL light emitting layer, and the transparent substrate 11 needs to be replaced. In this case, the replacement can be performed very easily.

  FIG. 4 is a cross-sectional view showing a modification of the auxiliary electrode applied to the lighting organic EL panel according to the embodiment of the present invention. Basically, since the same state as that in FIG. 2A is shown, different points will be mainly described.

  In the case of FIG. 2A, the elastic curved portion 13bc is formed by bending the connecting portion 13b in an arc shape, but in the case of FIG. 4, the connecting portion 13b is refracted. With this configuration, the elastic bending portion 13bc can be easily processed, and the auxiliary electrode 13 can be formed at a low cost. Further, it is possible to easily adjust the pressure by elasticity.

  FIG. 5 is a cross-sectional view showing a connection example of auxiliary electrodes applied to the lighting organic EL panel according to the embodiment of the present invention. Basically, since the same state as that in FIG. 2A is shown, different points will be mainly described.

  In the case of FIG. 2A, the auxiliary electrode 13 and the element electrode 12 are configured to be in direct contact with each other. However, in the case of FIG. 5, an elastic conductive material such as conductive rubber is provided between the auxiliary electrode 13 and the element electrode 12. The body 16 has been inserted. Since the element electrode 12 and the auxiliary electrode 13 are connected via the elastic conductor 16, it becomes possible to improve the adhesion at the contact surfaces of the element electrode 12, the elastic conductor 16, and the auxiliary electrode 13, More reliable connectivity can be ensured.

It is the top view which looked at the organic electroluminescent panel for illumination which concerns on embodiment of this invention from the sealing part side. It is explanatory drawing explaining the cross-section of the organic electroluminescent panel for illumination shown in FIG. 1, (A) is an end elevation which shows the end surface of the cross section by the arrow XX of FIG. 1, (B) is a figure. It is an end view which shows the end surface of the cross section by 1 arrow YY. It is a perspective view which shows the auxiliary electrode applied to the organic electroluminescent panel for illumination shown in FIG. It is sectional drawing which shows the modification of the auxiliary electrode applied to the organic EL panel for illumination which concerns on embodiment of this invention. It is sectional drawing which shows the example of a connection of the auxiliary electrode applied to the organic electroluminescent panel for illumination which concerns on embodiment of this invention. It is a top view which shows the form of the conventional pinching type auxiliary electrode applied to the planar light source body. It is explanatory drawing explaining the clamping state of the auxiliary electrode of the planar light source body shown in FIG. 6, (A) is an end view which shows the end surface of the cross section by the arrow XX of FIG. 6, (B). FIG. 7 is an end view showing an end face of a cross section taken along arrows Y-Y in FIG. 6, and FIG. 7C is an end view showing a clamping failure state in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Organic EL panel for illumination 11 Transparent substrate 11d Light emission surface 12 Element electrode 12m Minus element electrode 12p Plus element electrode 13 Auxiliary electrode 13m Minus auxiliary electrode 13p Plus auxiliary electrode 13f First contact part 13s Second contact part 13sd Dividing plate Part 13b Connecting part 13bc Elastic bending part 13h Connection hole 14 Sealing part 16 Elastic conductor W1 Width of divided plate part W2 Cutting width

Claims (5)

A transparent substrate having a light emitting surface; a sealing portion disposed on the opposite side of the light emitting surface so as to face the transparent substrate; and an element electrode led to the outer periphery of the sealing portion and disposed on the transparent substrate And an organic EL panel for illumination comprising an auxiliary electrode that contacts the element electrode and supplies electric power from the outside,
The auxiliary electrode extends in the side direction of the transparent substrate and is in contact with the transparent substrate in a planar shape. The auxiliary electrode is disposed to face the first contact portion and is in contact with the element electrode in a planar shape. A second contact portion, and a connection portion that connects the first contact portion and the second contact portion to sandwich the transparent substrate and the element electrode,
The second abutting part is constituted by a divided plate part divided with respect to the first abutting part, and the connecting part has an elastic bending part on the side connected to the second abutting part. An organic EL panel for lighting.   The lighting organic EL panel according to claim 1, wherein a height of the elastic curved portion from the transparent substrate is lower than a height of the sealing portion.   The lighting organic EL panel according to claim 1, wherein the connecting portion has a connection hole for connecting a lead wire led out to the outside.   The organic EL panel for illumination according to any one of claims 1 to 3, wherein the elastic curved portion is formed by being bent or refracted.   5. The lighting organic according to claim 1, wherein a width of the divided plate portion is at least five times a cutting width formed by the adjacent divided plate portions. EL panel.

Images