WO2013114568A1

WO2013114568A1 - Light-emitting panel and lighting apparatus using same

Info

Publication number: WO2013114568A1
Application number: PCT/JP2012/052140
Authority: WO
Inventors: 和明荒井; 越智　英夫; 石塚　真一
Original assignee: パイオニア株式会社
Priority date: 2012-01-31
Filing date: 2012-01-31
Publication date: 2013-08-08

Abstract

A light-emitting panel and a lighting apparatus using the light-emitting panel, the panel being provided with: a transparent substrate; and an organic light-emitting element having a laminated structure comprising an organic light-emitting layer, and a transparent electrode and a metal electrode sandwiching the organic light-emitting layer, the element being disposed on the substrate with the transparent electrode therebetween. The surface of the metal electrode on the side opposite the organic light-emitting layer is a mirror surface, and the light-emitting panel is covered by a transparent protective layer, uses the transparent-substrate side as a light-emitting part, and exposes the mirror surface side to the exterior through the transparent protective layer, for use as a mirror.

Description

Luminescent panel and lighting device using the same

The present invention relates to a light-emitting panel and a lighting device using the same.

There may be a vanity mirror in the cabin of a vehicle such as an automobile for the driver or passenger to check the appearance. Vanity mirrors are usually used for front seats and rear seats in the cabin of a car. For example, in a taxi, passengers usually use the rear seat, so the vanity mirror must be installed on the ceiling in the cabin. There is.

However, since a room lamp is already provided as a lighting device on the ceiling in the cabin, it is impossible to install a vanity mirror on the ceiling.

Therefore, in Patent Document 1, it is possible to change the use state of the vanity mirror and the use state of the cabin lighting with one action, and it is possible to improve the light use efficiency of the light source. There is shown a vehicular illuminating device that can use an illuminating unit for indoor lighting without being arranged.

JP 2007-22141 A

However, in the vehicular illumination device as disclosed in Patent Document 1, since the illumination unit and the vanity mirror are individually arranged, the illumination unit is moved when the illumination unit is used for cabin lighting. And a mechanism for opening and closing the vanity mirror are required, and there is a disadvantage that the structure becomes complicated.

Therefore, the problem to be solved by the present invention is to provide a light emitting panel that can be used freely as an illumination or a mirror with a simple structure, and an illumination device using the same, with the above-mentioned drawbacks being mentioned as an example. is there.

The light emitting panel of the invention according to claim 1 has a laminated structure comprising a transparent substrate, an organic light emitting layer, a transparent electrode sandwiching the organic light emitting layer, and a metal electrode, and is disposed on the substrate via the transparent electrode. An organic light emitting device, wherein the surface of the metal electrode opposite to the organic light emitting layer is a mirror surface, covered with a transparent protective layer, and the transparent substrate side is used as a light emitting unit, The mirror surface side is exposed to the outside through the transparent protective layer and used as a mirror part.

An illumination device according to an eighth aspect of the present invention has a laminated structure including a transparent substrate, an organic light emitting layer, a transparent electrode sandwiching the organic light emitting layer, and a metal electrode, and is disposed on the substrate via the transparent electrode. A light emitting panel including an organic light emitting element, and a support mechanism that reversibly supports the light emitting panel, wherein the surface of the metal electrode opposite to the organic light emitting layer is a mirror surface. Yes, it is covered with a transparent protective layer, the transparent substrate side is used as a light emitting part, and the mirror surface side is exposed to the outside through the transparent protective layer and used as a mirror part.

According to the light emitting panel of the invention of claim 1 and the lighting device of the invention of claim 8, the light generated in the organic light emitting layer is emitted through the transparent electrode and the transparent substrate, while the surface of the metal electrode is Acts as a mirror surface. That is, one main surface of the light emitting panel is the light emitting surface side, and the other main surface is the mirror surface side. Therefore, only one light emitting panel can be used freely as either an illumination or a mirror.

It is a front view which shows the illuminating device for vehicle cabins as Example 1 of this invention. It is sectional drawing which shows the structure of the light emission panel in the illuminating device of FIG. It is a figure which shows the use condition in the vehicle of the illuminating device of FIG. It is a front view which shows the illuminating device for vehicle cabins as Example 2 of this invention. It is sectional drawing which shows the structure of the light emission panel in the illuminating device of FIG. It is a figure which shows the use condition in the vehicle of the illuminating device of FIG. It is sectional drawing which shows the other structural example of the light emission panel in the illuminating device of FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an in-car cabin lighting device using the light-emitting panel of Example 1 of the present invention. The illumination device includes a light emitting panel 11. The light emitting panel 11 is held by the outer frame 12. The outer frame 12 has a rectangular frame shape, and the light emitting panel 11 is disposed and fixed in an opening in the outer frame 12. The light emitting panel 11 is fixed to the outer frame 12 by, for example, adhesion.

The longitudinal cylindrical portion 13 is formed integrally with the outer frame 12 and is located along the end of one side of the outer frame 12. It has two rotating shafts 13 a formed to project from the center of both end faces of the longitudinal cylindrical portion 13. The rotating shaft 13a is positioned outside both ends of one side of the outer frame 12. Moreover, the rotating shaft 13a is inserted into a through hole (not shown) of the support portion 14, and thereby the outer frame 12 including the light emitting panel 11 is rotatably supported by the support portion 14. Further, the outer frame 12 including the light emitting panel 11 can be held at an arbitrary angular position. The support portion 14 can be fixed to the vehicle ceiling via a mounting portion (not shown) by, for example, screwing.

The outer frame 12, the long cylindrical portion 13, and the support portion 14 are support mechanisms that support the light emitting panel 11 in a reversible manner.

The light emitting panel 11 is a panel having an organic EL (electroluminescence) element 20, and as shown in FIG. 2, an anode (transparent electrode) 22, an organic light emitting layer 23, a cathode (metal electrode) 24, and an adhesive on a transparent substrate 21. The layer 25 and the protective sheet layer (protective layer) 26 have a structure laminated in order. The anode 22, the organic light emitting layer 23, and the cathode 24 are the organic EL element 20.

The substrate 21 is made of transparent glass, or a transparent plastic material such as polyethylene terephthalate (PET) or polycarbonate (PC). The anode 22 is made of, for example, an ITO (tin-doped indium oxide) film formed on the substrate 21 by a sputtering method.

The organic light emitting layer 23 generally has a three-layer structure including a hole transport layer, a light emitting layer, and an electron transport layer (not shown) from the anode 22 side. Anyway. For example, a dry method such as a vacuum deposition method or a wet method such as an ink jet method or printing can be used to form the organic light emitting layer 23.

In order to use as illumination, it is necessary to emit white light. For white light emission, a plurality of RGB light emitting layers may be laminated, or a plurality of RGB light emitting materials may be included in the light emitting layer. The wavelength of the light may be converted with a yellow light emitter to emit white light.

The cathode 24 is made of a metal such as silver or aluminum having a high visible light reflectance, and can be formed by, for example, a vacuum deposition method. The surface of the cathode 24 (surface on the adhesive layer 25 side) is formed in a flat surface so as to act as a mirror surface. The surface of the cathode 24 may be subjected to a known mirror finish.

In addition, about the formation method of the organic light emitting layer 23, not only the above-mentioned method but a well-known method can be used.

As the protective sheet layer 26, a self-adhesive optical film is used. The film is made of a transparent polyester film such as PET, and the polyester film coated with a transparent (including translucent) resin adhesive as the adhesive layer 25 is used. Therefore, the protective sheet layer 26 is attached to the cathode 24 by the adhesive layer 25 by attaching the adhesive layer 25 side of the protective sheet layer 26 onto the cathode 24.

In the light emitting panel 11, the substrate 21 is on the light emitting surface side, and the protective sheet layer 26 is on the mirror surface side. That is, when a driving current is supplied between the anode 22 and the cathode 24 of the light emitting panel 11 from a driving unit (not shown), light is generated in the organic light emitting layer 23, and the light is externally transmitted through the anode 22 and the substrate 21. To be released. Since the cathode 24 is exposed to the outside through the protective sheet layer 26 on the mirror surface side, the light incident from the protective sheet layer 26 is reflected by the mirror surface and emitted through the protective sheet layer 26 at the cathode 24.

In the conventional lighting device, the back surface of the light-emitting panel, that is, the cathode 24 side described above, is housed in a casing, and its mirror surface is not utilized. On the other hand, the illumination device according to the first embodiment can be used as a mirror surface by using a structure in which the back surface of the light emitting panel is positively exposed as described above.

The illuminating device of Example 1 having such a configuration is attached to a cabin ceiling 30 in an automobile, for example, as shown in FIG. In this attachment, the direction perpendicular to the traveling direction of the automobile is the axial direction of the rotating shaft 13a. In the state shown by the solid line in FIG. 3, the mirror surface side of the light emitting panel 11 faces the ceiling 30 direction, and the light emitting surface side of the light emitting panel 11 is exposed in the vehicle, and can be used as a lighting fixture.

On the other hand, when the outer frame 12 including the light emitting panel 11 is rotated in the direction indicated by the arrow A in FIG. 3, the light emitting surface side of the light emitting panel 11 faces the ceiling 30 and the mirror surface side of the light emitting panel 11 is exposed inside the vehicle. The position of the outer frame 12 including the light emitting panel 11 is adjusted within the rotation range so that the mirror side faces the passenger. In the state shown by the broken line in FIG. 3, the mirror surface side of the light emitting panel 11 is exposed in the vehicle and can be used as a so-called vanity mirror.

In the illuminating device of Example 1 described above, one surface of one light-emitting panel can be used as the light-emitting side (light-emitting portion) of the lighting fixture, and the other surface can be used as the mirror-side (mirror portion). It can be easily attached to the ceiling inside the car. In addition, there is an advantage that the cost is lower than that in which the mirror and the lighting fixture are independent.

Further, a protective sheet layer 26 is disposed on the cathode 24 in order to use the surface of the cathode 24 of the organic EL element 20 as a mirror surface. When a process that becomes high temperature is used when forming such a protective sheet layer 26, the organic light emitting layer 23 is damaged. Therefore, as described above, the protective sheet layer 26 of the transparent film is made to be a cathode with the adhesive forming the adhesive layer 25. It was made possible to process at room temperature by pasting on 24. Thereby, it is possible to prevent the organic light emitting layer 23 from being damaged when forming the protective sheet layer 26 and to protect the surface even when used as a mirror surface, thereby improving durability.

FIG. 4 shows a vehicular illumination device to which the light emitting panel according to the second embodiment of the present invention is applied. The illumination device according to the second embodiment includes a light emitting panel 31, an outer frame 32, a long cylindrical portion 33 (including a rotation shaft 33a), and a support portion 34. Since the outer frame 32, the long cylindrical part 33, and the support part 34 are the same as the outer frame 12, the long cylindrical part 13 and the support part 14 of Example 1, description here is abbreviate | omitted.

As shown in FIG. 5, the light emitting panel 31 has a structure in which an anode (transparent electrode) 42, an organic light emitting layer 43, a cathode (metal electrode) 44, an adhesive layer 45, and a protective sheet layer 46 are sequentially laminated on a transparent substrate 41. This laminated structure portion is the same as the transparent substrate 21, the anode 22, the organic light emitting layer 23, the cathode 24, the adhesive layer 25, and the protective sheet layer 26 of Example 1. The anode 42, the organic light emitting layer 43, and the cathode 44 are the organic EL element 40.

The light emitting panel 31 further includes a transparent annular member 47 and a light transmission plate 48 as an optical system. The transparent annular member 47 corresponds to a transparent longitudinal member and is an optical element having a vertical isosceles triangular cross section formed in a quadrangular annular shape so as to surround the substrate 41, the anode 42, and the organic light emitting layer 43 from their side surfaces. Has been placed. That is, as can be seen from the cross-sectional view of FIG. 5, the transparent annular member 47 has a light incident surface 47 a that is one side surface of equal two sides, a light reflection surface 47 b that is a side surface other than the equal two sides, and The light emitting surface 47c is the other side surface, and the light incident surface 47a is in surface contact with the side surfaces of the substrate 41, the anode 42 and the organic light emitting layer 43. The light emitting surface 47 c is located on the same plane as the interface between the organic light emitting layer 43 and the cathode 43.

The light transmission plate 48 is a rectangular annular transparent plate, and is disposed so as to surround the cathode 44, the adhesive layer 45, and the protective sheet layer 46 from their side surfaces. The surface of the light transmission plate 48 is located on the same plane as the surface of the protective sheet layer 46. The back surface of the light transmission plate 48 is in surface contact with the light emitting surface 47 c of the transparent annular member 47.

Each of the transparent annular member 47 and the light transmission plate 48 is made of transparent (including translucent) glass or resin.

The illuminating device of Example 2 having such a configuration is attached to a cabin ceiling 30 in an automobile, for example, as shown in FIG. In this attachment, the direction perpendicular to the traveling direction of the automobile is the axial direction of the rotating shaft 33a. In the state shown by the solid line in FIG. 6, the mirror surface side of the light emitting panel 31 faces the ceiling 30 direction, and the light emitting surface side of the light emitting panel 31 is exposed in the vehicle, and can be used as a lighting fixture.

On the other hand, when the outer frame 32 including the light emitting panel 31 is rotated in the direction indicated by the arrow B in FIG. 6, the light emitting surface side of the light emitting panel 31 faces the ceiling 30 direction, and the mirror surface side of the light emitting panel 31 is exposed in the vehicle. The position of the outer frame 32 including the light emitting panel 31 is adjusted within the rotation range so that the mirror side faces the passenger. In the state shown by the broken line in FIG. 6, the mirror surface side of the light emitting panel 31 is exposed in the vehicle and can be used as a so-called vanity mirror.

When a driving current is supplied from a driving unit (not shown) between the anode 42 and the cathode 44 of the light emitting panel 31 in the state of use as the vanity mirror, light is generated in the organic light emitting layer 43, and the light is emitted from the anode 42. And discharged to the outside through the substrate 41. Further, the light generated in the organic light emitting layer 43 is emitted as leakage light from the side surface of the organic light emitting layer 43, and is further emitted as leakage light from the side surfaces of the anode 42 and the substrate 41. Leaked light from these side surfaces enters the light incident surface 47a of the transparent annular member 47 as shown by an arrow C in FIG. 5, reflects off the light reflecting surface 47b, and passes through the light transmitting plate 48 from the light emitting surface 47c. To the outside of the device. That is, the light transmission plate 48 around the vanity mirror is on the light emitting surface side.

Therefore, in the illuminating device of the second embodiment, when the mirror surface of the light emitting panel 31 is used as a vanity mirror in a dark car, the leakage light from the side surfaces of the organic light emitting layer 43, the anode 42, and the substrate 41 is used as illumination. Can do.

In Example 2 described above, the transparent annular member 47 is formed in an annular shape so as to surround all of the above-described laminated structure portion of the light emitting panel 31, that is, by extension of the transparent longitudinal member. Without being limited thereto, a transparent longitudinal member having a triangular cross section may be provided only on a part of the side surface of the laminated structure portion. Further, the transparent annular member 47 and the light transmission plate 48 may be integrally formed. Further, the transparent annular member 47 may be disposed at least on the side surface of the organic light emitting layer 43.

Furthermore, in Example 2 described above, only the leakage light on the side surfaces of the organic EL element 40 and the substrate 41 is led out to the mirror surface side of the light emitting panel by the transparent annular member 47. However, as shown in FIG. One end of the member 47 is formed so as to wrap around the surface (light emitting main surface) of the substrate 41, and not only the leakage light on the side surface but also light emitted from the surface periphery (or part of the surface periphery) of the substrate 41. A part of the light may be transmitted to the mirror side of the light emitting panel.

Also, an optical fiber can be used as an optical system in place of the transparent longitudinal member such as the transparent annular member 47.

Furthermore, in the above-described first and second embodiments, the lighting device for a vehicle cabin has been described. However, the lighting device of the present invention is not limited to a vehicle cabin, and may be used in a building room or outside a building room. Further, in the above-described first and second embodiments, the side end portion forming one side of the light-emitting panel is made reversible by the support mechanism, but if the rotation shaft can reverse the light-emitting panel, light emission is possible. It can be anywhere on the panel.

Furthermore, a fixing mechanism for fixing the light emitting panel in a state where the light emitting surface side of the light emitting panel is exposed in the vehicle cabin may be further included so that the light emitting panel does not rotate or reverse due to vibration of the vehicle.

Further, in the above-described first and second embodiments, the light emitting panel is square, but it is needless to say that the present invention can be applied to light emitting panels having other shapes such as a circle.

DESCRIPTION OF

SYMBOLS

11, 31

Light emission panel

12, 32

Outer frame

13, 33 Long

cylindrical part

14, 34

Support part

20, 40

Organic EL element

22, 42

Anode

23, 43 Organic

light emitting layer

24, 44 Cathode 47 Transparent annular member

Claims

A transparent substrate;
An organic light emitting panel comprising an organic light emitting layer and a transparent electrode sandwiching the organic light emitting layer and a metal electrode, and an organic light emitting element disposed on the substrate via the transparent electrode,
The surface of the metal electrode opposite to the organic light emitting layer is a mirror surface and is covered with a transparent protective layer,
A light emitting panel, wherein the transparent substrate side is used as a light emitting portion, and the mirror surface side is exposed to the outside through the transparent protective layer and used as a mirror portion.
The light-emitting panel according to claim 1, wherein the transparent protective layer is disposed on the surface of the metal electrode opposite to the organic light-emitting layer through an adhesive layer.
The light emitting panel according to claim 1 or 2, further comprising an optical system for emitting light emitted from a side surface of the organic light emitting element to the metal electrode side.
The optical system includes a transparent longitudinal member having a triangular cross section, and one side surface of the transparent longitudinal member is in surface contact with the side surface of the organic light emitting element as a light incident surface, and another side surface of the transparent longitudinal member is light. The light emitting panel according to claim 3, wherein the light emitting panel is parallel to the mirror surface as an output surface.
5. The light emitting panel according to claim 4, wherein a cross section of the transparent longitudinal member is a vertical isosceles triangle, and a side surface including one of the equilateral sides is the one side surface.
6. The light-emitting panel according to claim 4, wherein the light-emitting panel has a quadrangular outer shape, and the transparent longitudinal member extends around the square.
6. The light emitting panel according to claim 4, wherein the optical system further includes a light transmission plate in surface contact with the light emitting surface of the transparent longitudinal member.
A light emitting panel comprising: a transparent substrate; and an organic light emitting element having a laminated structure including an organic light emitting layer and a transparent electrode and a metal electrode sandwiching the organic light emitting layer, and disposed on the substrate via the transparent electrode; ,
A support mechanism for reversibly supporting the light emitting panel, and a lighting device comprising:
The surface of the metal electrode opposite to the organic light emitting layer is a mirror surface and is covered with a transparent protective layer,
An illumination device, wherein the transparent substrate side is used as a light emitting portion, and the mirror surface side is exposed to the outside through the transparent protective layer and used as a mirror portion.
9. The lighting device according to claim 8, wherein the illuminating device is mounted in the cabin so that the support mechanism inverts the light-emitting panel about a direction perpendicular to the traveling direction of the vehicle in the cabin of the vehicle. Lighting device.
The lighting device according to claim 8, further comprising a fixing mechanism for fixing the light emitting panel in a state where the substrate of the light emitting panel is exposed in the cabin.