JP2017098104A - Light-emitting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase light utilization efficiency in a light-emitting device that includes an organic EL panel disposed along a transparent member with a three-dimensional curved surface of a vehicle window or the like.SOLUTION: A light-emitting device 10 is mounted to a transparent member 100 having a mounting surface 100a formed in a three-dimensional curved surface. The light-emitting device 10 includes: an organic EL panel 12 having an emission surface 23a emitting light; and an interposing member 14 interposed between the mounting surface 100a of the transparent member 100 and the emission surface 23a of the organic EL panel 12. The interposing member 14 includes: a transparent member facing surface 14a facing the mounting surface 100a of the transparent member 100; and a panel facing surface 14b facing the emission surface 23a of the organic EL panel 12. The transparent member facing surface 14a of the interposing member 14 has a shape corresponding to the three-dimensional curved surface of the mounting surface 100a. The panel facing surface 14b of the interposing member 14 has a shape corresponding to the emission surface 23a of the organic EL panel 12.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a light emitting device using an organic EL (Electro Luminescence).

  Conventionally, a light-emitting device in which an organic EL panel is arranged along the inside of a vehicle window has been proposed (see, for example, Patent Document 1).

JP2015-76294A

  However, the vehicle window is often formed in a three-dimensional curved surface. On the other hand, it is not easy to manufacture a three-dimensional curved organic EL panel. Accordingly, when the organic EL panel is disposed along the window of the vehicle, a gap may be generated between the window and the organic EL panel to form an air layer. When an air layer exists between the window and the organic EL panel, the refractive index of glass and air is different, and reflection occurs on the surface of the organic EL panel or glass. For this reason, the amount of light emitted from the window to the outside of the vehicle is reduced, which may reduce the light utilization efficiency.

  The present invention has been made in view of such circumstances, and an object thereof is to improve light use efficiency in a light-emitting device in which an organic EL panel is arranged along a transparent member having a three-dimensional curved surface such as a vehicle window. It is in.

  In order to solve the above problems, a light-emitting device according to an aspect of the present invention is a light-emitting device attached to a transparent member having an attachment surface formed in a three-dimensional curved surface. This light-emitting device is an organic EL panel having an emission surface for emitting light, and an interposed member interposed between the attachment surface of the transparent member and the emission surface of the organic EL panel, and faces the attachment surface of the transparent member. An interposition member having a transparent member facing surface and a panel facing surface facing the emitting surface of the organic EL panel. The transparent member facing surface of the interposed member has a shape corresponding to the three-dimensional curved surface of the mounting surface, and the panel facing surface of the interposed member has a shape corresponding to the emission surface of the organic EL panel.

  The interposition member may be an optical member that controls light emitted from the organic EL panel.

  The interposition member may be a transparent double-sided tape or a silicon sheet.

  Another embodiment of the present invention is also a light emitting device. This device is attached to a transparent member having an attachment surface formed in a three-dimensional curved surface. The light emitting device includes an organic EL panel having an emission surface for emitting light, and a mounting portion of the organic EL panel formed on the attachment surface of the transparent member, and has a panel facing surface that faces the emission surface of the organic EL panel. And an attachment portion. The mounting surface of the transparent member is formed in a three-dimensional curved surface, and the panel facing surface of the mounting portion has a shape corresponding to the emission surface of the organic EL panel.

  The organic EL panel may include a plurality of light emitting units divided from each other. You may further provide the luminous intensity variable means which changes the luminous intensity of each light emission part temporally, making the value which totaled the luminous intensity of the several light emission part into the predetermined range.

  ADVANTAGE OF THE INVENTION According to this invention, in the light-emitting device which has arrange | positioned organic electroluminescent panel along the transparent member which has three-dimensional curved surfaces, such as a vehicle window, light utilization efficiency can be improved.

It is a schematic sectional drawing of the light-emitting device which concerns on embodiment of this invention. It is a schematic sectional drawing of the light-emitting device which concerns on another embodiment of this invention. It is a figure which shows the modification of a light-emitting device. It is a schematic sectional drawing of the light-emitting device which concerns on another embodiment of this invention. It is a schematic front view of the light-emitting device which concerns on another embodiment of this invention. It is a figure which shows the circuit diagram of a light-emitting device. Fig.7 (a)-FIG.7 (f) are the figures for demonstrating operation | movement of a light-emitting device. It is a schematic sectional drawing of the vehicle lamp using the light-emitting device which concerns on embodiment of this invention.

  Hereinafter, a light emitting device according to an embodiment of the present invention will be described in detail with reference to the drawings. In addition, since each drawing aims at explaining the positional relationship of each member, it does not necessarily represent the actual dimensional relationship of each member. Further, in the description of each embodiment, the same or corresponding components are denoted by the same reference numerals, and overlapping descriptions are omitted as appropriate.

  FIG. 1 is a schematic cross-sectional view of a light emitting device 10 according to an embodiment of the present invention. The light emitting device 10 shown in FIG. 1 can be used as a vehicular lamp such as a tail lamp or a stop lamp.

  As shown in FIG. 1, the light emitting device 10 is used in a state of being attached to the transparent member 100. The transparent member 100 may be a rear window of a vehicle, for example. The transparent member 100 has an attachment surface 100a to which the light emitting device 10 is attached and an outer surface 100b that faces the attachment surface 100a. When the transparent member 100 is a rear window of the vehicle, the mounting surface 100a is a surface inside the vehicle of the rear window. The attachment surface 100a is formed in a three-dimensional curved surface.

  The light emitting device 10 includes an organic EL panel 12 and an interposed member 14.

  The organic EL panel 12 is configured by laminating an anode 21, an organic material layer 24 and a cathode 26 on a transparent glass substrate 23, and further sealing them with a sealing member 28. As the anode 21, a transparent electrode such as ITO (indium tin oxide) is used. As the cathode 26, a metal electrode such as aluminum is used. When a voltage is applied to the organic material layer 24 using the anode 21 and the cathode 26, holes are injected from the anode 21, electrons are injected from the cathode 26, and the fluorescent organic compound is generated by energy generated when they are combined in the organic material layer 24. Is excited and emits light. Of the light emitted from the organic layer 24, the light directed to the anode 21 passes through the anode 21 and is emitted from the emission surface 23 a of the glass substrate 23. On the other hand, the light emitted from the organic layer 24 toward the cathode 26 is reflected by the cathode 26, passes through the organic layer 24 and the anode 21, and is emitted from the emission surface 23 a of the glass substrate 23. The organic layer 24 may contain a phosphorescent organic compound. In the present embodiment, the emission surface 23a of the glass substrate 23 is formed in a flat shape.

  The interposed member 14 is a transparent member that is interposed between the mounting surface 100 a of the transparent member 100 and the emission surface 23 a of the organic EL panel 12. In the present embodiment, the interposition member 14 is an optical member (for example, a lens) that controls the light emitted from the organic EL panel 12, and is formed of a resin or glass having a refractive index of about 1.4 to 1.6. Good. The intervening member 14 has a transparent member facing surface 14 a that faces the mounting surface 100 a of the transparent member 100, and a panel facing surface 14 b that faces the emission surface 23 a of the organic EL panel 12.

  The transparent member facing surface 14 a of the interposed member 14 has a shape corresponding to the three-dimensional curved surface of the mounting surface 100 a of the transparent member 100. The shape corresponding to the three-dimensional curved surface of the mounting surface 100a is such that no gap is formed between the mounting surface 100a and the transparent member facing surface 14a when the transparent member facing surface 14a is brought into contact with the mounting surface 100a. It is a three-dimensional curved surface shape.

  On the other hand, the panel facing surface 14 b of the interposed member 14 has a shape corresponding to the emission surface 23 a of the organic EL panel 12. The shape corresponding to the emission surface 23a of the organic EL panel 12 is such that no gap is formed between the emission surface 23a and the panel facing surface 14b when the panel facing surface 14b is brought into contact with the emitting surface 23a. It is. In the present embodiment, since the emission surface 23a is planar, the panel facing surface 14b is also planar.

  The transparent member facing surface 14 a of the interposed member 14 and the mounting surface 100 a of the transparent member 100 are fixed by the first adhesive member 31. Further, the panel facing surface 14 b of the interposing member 14 and the emission surface 23 a of the organic EL panel 12 are fixed by the second adhesive member 32. The first adhesive member 31 and the second adhesive member 32 may be a highly transparent double-sided tape or a transparent silicon sheet. The refractive indexes of the first adhesive member 31 and the second adhesive member 32 may be about 1.4 to 1.6.

  In the light emitting device 10 configured as described above, the light emitted from the emission surface 23a of the organic EL panel 12 passes through the second adhesive member 32, the interposition member 14, and the first adhesive member 31, and then is attached to the attachment surface 100a. Enters the transparent member 100 and exits from the outer surface 100b.

  The light emitting device 10 according to this embodiment has been described above. If the intervening member 14 is not provided, the mounting surface 100a of the transparent member 100 is a three-dimensional curved surface, and the emission surface 23a of the organic EL panel 12 is a flat surface. Therefore, there is a gap between the transparent member 100 and the organic EL panel 12. This can result in the formation of an air layer. In this case, the amount of light emitted from the transparent member 100 may decrease due to the surface reflection that occurs on the mounting surface 100a and the output surface 23a, and the light utilization efficiency may decrease.

  Therefore, in the light emitting device 10 according to the present embodiment, the interposition member 14 is disposed between the mounting surface 100a of the transparent member 100 and the emission surface 23a of the organic EL panel 12. And the transparent member opposing surface 14a of the interposition member 14 was made into the shape corresponding to the three-dimensional curved surface of the attachment surface 100a, and the panel opposing surface 14b of the interposition member 14 was made into the shape corresponding to the output surface 23a. As a result, it is possible to prevent an air layer from being formed between the organic EL panel 12 and the transparent member 100, thereby preventing surface reflection that occurs on the mounting surface 100a and the emission surface 23a, thereby reducing the light utilization efficiency. Can be suppressed.

  Further, the light emitting device 10 according to the present embodiment has an advantage that the light from the organic EL panel 12 can be controlled by using the interposed member 14 as an optical element.

  FIG. 2 is a schematic cross-sectional view of a light emitting device 40 according to another embodiment of the present invention. The light emitting device 40 according to this embodiment is also used in a state where it is attached to the transparent member 100. The mounting surface 100a of the transparent member 100 is formed in a three-dimensional curved surface.

  As shown in FIG. 2, also in the light emitting device 40 according to the present embodiment, the interposition member 42 is disposed between the emission surface 23 a of the organic EL panel 12 and the mounting surface 100 a of the transparent member 100. In this embodiment, the interposition member 42 is made of a transparent double-sided tape or a silicon sheet. The emission surface 23 a of the organic EL panel 12 and the mounting surface 100 a of the transparent member 100 are fixed by the interposed member 42. The refractive index of the interposed member 42 may be about 1.4 to 1.6. The transparent member facing surface 42a of the interposed member 42 has a shape corresponding to the three-dimensional curved surface of the mounting surface 100a of the transparent member 100, and the panel facing surface 42b of the interposed member 42 is on the light emitting surface 23a of the organic EL panel 12. It has a corresponding shape.

  Also in the light emitting device 40 according to the present embodiment, the interposition member 42 is disposed between the mounting surface 100a of the transparent member 100 and the emission surface 23a of the organic EL panel 12, whereby the organic EL panel 12 and the transparent member 100 are separated. An air layer can be prevented from being formed therebetween. As a result, surface reflection that occurs on the mounting surface 100a and the emission surface 23a is prevented, and a decrease in light utilization efficiency can be suppressed.

  Further, in the light emitting device 40 according to the present embodiment, since the interposed member 42 is made of a transparent double-sided tape or a silicon sheet, there is an advantage that the number of parts can be reduced as compared with the embodiment shown in FIG.

  FIG. 3 shows a modification of the light emitting device 40. In the light emitting device 40 shown in FIG. 3, in order to more reliably fix the organic EL panel 12 to the transparent member 100, a fixing tape 44 is attached so as to cover the entire organic EL panel 12. Note that the fixing tape 44 may also be used in the light emitting device 10 shown in FIG.

  FIG. 4 is a schematic cross-sectional view of a light emitting device 50 according to still another embodiment of the present invention. The light emitting device 50 according to the present embodiment is also used in a state of being attached to the transparent member 100. The mounting surface 100a of the transparent member 100 is formed in a three-dimensional curved surface.

  In the light emitting device 50 according to this embodiment, the mounting portion 100 c of the organic EL panel 12 is formed on the mounting surface 100 a of the transparent member 100. The attachment portion 100 c is a pedestal-shaped portion formed integrally with the transparent member 100. The attachment portion 100c is formed of the same transparent material as the transparent member 100.

  The mounting portion 100 c has a panel facing surface 100 d that faces the light emitting surface 23 a of the organic EL panel 12. The panel facing surface 100d has a shape corresponding to the emission surface 23a of the organic EL panel 12. For example, when the emission surface 23a is a flat surface, the panel facing surface 100d is also formed as a flat surface.

  The panel facing surface 100d of the mounting portion 100c and the emission surface 23a of the organic EL panel 12 are fixed by an adhesive member 52. The adhesive member 52 may be a highly transparent double-sided tape or a transparent silicon sheet. The refractive index of the adhesive member 52 may be about 1.4 to 1.6.

  As described above, in the light emitting device 50 according to this embodiment, the attachment portion 100 c is formed on the attachment surface 100 a of the transparent member 100. And the panel opposing surface 100d of the attaching part 100c was made into the shape corresponding to the output surface 23a of the organic electroluminescent panel 12. FIG. Thereby, it is possible to prevent an air layer from being formed between the organic EL panel 12 and the transparent member 100. As a result, surface reflection that occurs on the mounting surface 100a and the emission surface 23a is prevented, and a decrease in light utilization efficiency can be suppressed.

  Further, the light emitting device 50 according to the present embodiment has an advantage that it is not necessary to separately prepare an interposition member as shown in FIGS. 1 and 2 because the attachment portion 100c is formed integrally with the transparent member 100. When the transparent member 100 is formed by injection molding, the attachment portion 100c can be easily formed by changing the mold.

  FIG. 5 is a schematic front view of a light emitting device 60 according to still another embodiment of the present invention. The light emitting device 60 is used in a state attached to the transparent member 100. The transparent member 100 may be a rear window of a vehicle, for example.

  The light emitting device 60 includes the organic EL panel 12. The organic EL panel 12 may be attached to the attachment surface 100a of the transparent member 100 via an interposition member or an attachment part, as in the above-described embodiment. In the present embodiment, the organic EL panel 12 includes a plurality of (four) light emitting units (first light emitting unit 12a to fourth light emitting unit 12d) that are separated from each other.

  Furthermore, the light emitting device 60 includes a peripheral light emitting unit 51 disposed so as to surround the periphery of the organic EL panel 12. The peripheral light emitting unit 51 is configured to always emit light while the light emitting device 60 is lit. The peripheral light emitting unit 51 may be configured using an organic EL panel. Or the peripheral light emission part 51 may be comprised using a plate-shaped light guide and the light source (LED etc.) provided in the edge part of this plate-shaped light guide.

  FIG. 6 shows a circuit diagram of the light emitting device 60. As shown in FIG. 6, the first light emitting unit 12 a to the fourth light emitting unit 12 d and the peripheral light emitting unit 51 are connected in series to the constant current circuit 62. The light emitting device 60 includes a switch 61 for turning on and off the first light emitting unit 12a to the fourth light emitting unit 12d and the peripheral light emitting unit 51. Furthermore, a switch (first switch 64a to fourth switch 64d) is connected in parallel with each of the first light emitting unit 12a to the fourth light emitting unit 12d.

  The first switch 64 a to the fourth switch 64 d can be turned on / off by the controller 66. In the light emitting device 60, an arbitrary light emitting unit can be turned on by controlling on / off of the first switch 64a to the fourth switch 64d. For example, when all of the first switch 64a to the fourth switch 64d are turned off, all of the first light emitting unit 12a to the fourth light emitting unit 12d are lit. Conversely, when all of the first switch 64a to the fourth switch 64d are turned on, all of the first light emitting unit 12a to the fourth light emitting unit 12d are turned off. For example, when only the first switch 64a is turned off and the other switches are turned on, only the first light emitting unit 12a is turned on and the other light emitting units are turned off. The first switch 64a to the fourth switch 64d and the control unit 66 constitute luminous intensity varying means for temporally changing the luminous intensity of the first light emitting part 12a to the fourth light emitting part 12d.

  Fig.7 (a)-FIG.7 (f) are the figures for demonstrating operation | movement of the light-emitting device 60 which concerns on this embodiment. FIG. 7A shows a temporal change in luminous intensity of the peripheral light emitting unit 51. FIG. 7B shows a temporal change in luminous intensity of the first light emitting unit 12a. FIG.7 (c) shows the time change of the luminous intensity of the 2nd light emission part 12b. FIG. 7D shows a temporal change in the luminous intensity of the third light emitting unit 12c. FIG. 7E shows a temporal change in the luminous intensity of the fourth light emitting unit 12d. FIG. 7F shows a temporal change in the value obtained by summing the luminous intensity of the peripheral light emitting unit 51 and the first light emitting unit 12a to the fourth light emitting unit 12d.

  As shown in FIG. 7A, the peripheral light emitting unit 51 always emits light. In addition, the control unit 66 temporally changes the light intensity of each light emitting unit while keeping the total light intensity of the first light emitting unit 12a to the fourth light emitting unit 12d within a predetermined range. For example, as shown in FIGS. 7A to 7D, only one of the four light emitting units is lit at 100% intensity, and the remaining three are lit at about 10%, for example. Control one switch. The intensity of lighting can be changed by performing PWM (Pulse Width Modulation) control using the first switch 64a to the fourth switch 64d. In the present embodiment, among the first light emitting unit 12a to the fourth light emitting unit 12d, the light emitting unit that is turned on is temporal. As a result, as shown in FIG. 7F, the total value of the luminous intensity of the peripheral light emitting unit 51 and the four light emitting units falls within a predetermined range.

  In the vehicular lamp, it is necessary to maintain the luminous intensity of the entire lamp at a predetermined reference value or more. Therefore, as in the present embodiment, the light intensity of each of the light emitting units is changed within a predetermined range, and the light intensity of each light emitting unit is changed with time, thereby giving a movement to how the lamp shines. Therefore, a vehicular lamp with excellent visibility can be realized.

  Further, in the vehicular lamp, it is necessary to keep the light emitting area constant. Therefore, in this embodiment, while one light emitting unit is turned on, the other light emitting units are not completely turned off, but are turned on with a small intensity (for example, 10%), and the light emitting area of the entire light emitting device 60 is constant. It keeps in.

  When the light emitting device 60 is used as a vehicular lamp, it is desirable to select a light emitting unit to be lit at random in order to avoid misidentification as a sequential turn signal. Moreover, in order for the viewer to appropriately recognize the temporal change in luminous intensity, it is desirable that the lower limit of the blinking frequency is 1 Hz and the upper limit is 10 Hz.

  In the present embodiment, the plurality of light emitting units are blinked. This can extend the lifetime of the light emitting part as compared to the case where the light emitting part is always emitting light.

  FIG. 8 is a schematic sectional view of a vehicular lamp 200 using the light emitting device 10 according to the embodiment of the present invention. The vehicle lamp 200 shown in FIG. 8 may be a tail lamp, a stop lamp, or the like.

  As shown in FIG. 8, the vehicular lamp 200 is provided in a lamp body 202, a transparent cover 204 covering the front opening of the lamp body 202, and a lamp chamber 206 formed by the lamp body 202 and the cover 204. The light emitting device 210 is provided. The cover 204 is formed in a three-dimensional curved surface following the shape of the vehicle to which the vehicle lamp 200 is attached.

  A light-emitting device 210 illustrated in FIG. 8 has a configuration similar to that of the light-emitting device 10 illustrated in FIG. That is, the interposition member 14 is disposed between the attachment surface 204 a of the cover 204 and the emission surface 23 a of the organic EL panel 12. The transparent member facing surface 14a of the interposed member 14 has a shape corresponding to the three-dimensional curved surface of the mounting surface 204a of the cover 204, and the panel facing surface 14b of the interposed member 14 has a shape corresponding to the emitting surface 23a. As a result, it is possible to prevent an air layer from being formed between the organic EL panel 12 and the cover 204, so that surface reflection that occurs on the mounting surface 204a and the emission surface 23a is prevented, and a decrease in light utilization efficiency is suppressed. it can.

  According to the vehicular lamp 200 according to the present embodiment, since the configuration in which the light emitting device 210 is attached to the cover 204 is employed, a thin vehicular lamp 200 can be realized.

  In the present embodiment, the light emitting device 210 similar to the light emitting device 10 shown in FIG. 1 is disposed in the lamp chamber 206, but the light emitting device 210 is the same as the light emitting device 40 shown in FIG. 2 and the light emitting device 50 shown in FIG. It may be configured as follows.

  The present invention has been described above based on the embodiment. It should be understood by those skilled in the art that these embodiments are exemplifications, and that various modifications can be made to the combination of each component and each processing process, and such modifications are also within the scope of the present invention.

  10, 40, 50, 60, 210 Light emitting device, 12 Organic EL panel, 14, 42 Intervening member, 23 Glass substrate, 31 First adhesive member, 32 Second adhesive member, 40 Light emitting device, 44 Fixing tape, 51 Around Light emitting part, 61 switch, 62 constant current circuit, 66 control part, 100 transparent member, 200 vehicle lamp, 202 lamp body, 204 cover.

Claims (5)

A light emitting device attached to a transparent member having an attachment surface formed in a three-dimensional curved surface,
An organic EL panel having an emission surface for emitting light;
An interposed member interposed between the mounting surface of the transparent member and the emission surface of the organic EL panel, the transparent member facing surface facing the mounting surface of the transparent member, and the organic EL panel An interposition member having a panel facing surface facing the emitting surface;
With
The transparent member facing surface of the interposition member has a shape corresponding to the three-dimensional curved surface of the mounting surface,
The light emitting device, wherein the panel facing surface of the interposition member has a shape corresponding to the emission surface of the organic EL panel.   The light emitting device according to claim 1, wherein the interposition member is an optical member that controls light emitted from the organic EL panel.   The light emitting device according to claim 1, wherein the interposition member is a transparent double-sided tape or a silicon sheet. A light emitting device attached to a transparent member having an attachment surface formed in a three-dimensional curved surface,
An organic EL panel having an emission surface for emitting light;
An attachment portion of the organic EL panel formed on the attachment surface of the transparent member, the attachment portion having a panel facing surface facing the emission surface of the organic EL panel;
With
The mounting surface of the transparent member is formed in a three-dimensional curved surface,
The panel-facing surface of the mounting portion has a shape corresponding to the emission surface of the organic EL panel. The organic EL panel includes a plurality of light emitting units divided from each other,
5. The apparatus according to claim 1, further comprising: a luminous intensity varying unit that temporally changes the luminous intensity of each light emitting unit while keeping a total value of the luminous intensity of the plurality of light emitting units within a predetermined range. Light emitting device.

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