JP2019160585A - Optical device - Google Patents

Abstract

To suppress error detection of a light emission element due to light irradiated from a light emitting device.SOLUTION: An optical device 40 comprises: a substrate 100; a light emitting part 142; a light adjustment region 30; and a light reception element 220. The substrate 100 includes a first surface 102. The light emitting part 142 is positioned at a first surface 102 side of the substrate 100, and includes a first electrode 110, an organic layer 120, and a second electrode 130. The light adjustment region 30 can be transferred to a first state of having a first transmission coefficient to a peak wavelength of light emitted from the light emitting part 142 and a second state of having a second transmission coefficient lower than the first transmission coefficient in response to a peak wavelength of the light emitted from the light emitting part 142. The light adjustment region 30 is positioned between the light emitting part 142 and the light reception element 220 on the first surface 102 of the substrate 100.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an optical device.

  In recent years, organic light emitting diodes (OLEDs) have been developed as light emitting devices. The OLED has a first electrode, an organic layer, and a second electrode. The first electrode, the organic layer, and the second electrode constitute a light emitting unit. The organic layer can emit light by organic electroluminescence (EL) by a voltage between the first electrode and the second electrode. The light emitting part can be sealed with a sealing part (for example, a sealing can).

  Patent Documents 1 and 2 describe examples of OLEDs. The OLED of Patent Document 1 includes an electrochromic (EC) element attached to the surface of the sealing portion. The OLED of Patent Document 2 includes a light shielding film attached to the surface of the sealing portion.

  Patent Document 3 describes an example of a lighting fixture. The lighting fixture includes a light source and a sensor. The sensor detects the illuminance of the light source. The light source is operated based on the detection result of the sensor. In Patent Document 3, the sensor is surrounded by a light shielding wall so that light from the light source does not enter the sensor.

  Patent Document 4 describes an example of an EC element. The EC element can transition to a transparent state by hydrogenation, and can transition to a reflection state by dehydrogenation.

JP 2016-29613 A JP 2003-257618 A JP, 2015-210934, A JP 2017-37261 A

  As described above, in recent years, OLEDs have been developed as light emitting devices. In certain applications (eg, automotive tail lamps), such light emitting devices may be used in conjunction with devices (eg, photosensors or imaging devices) having light receiving elements (eg, photodiodes (PD)). is there. In this case, it is necessary to suppress the erroneous detection of the light receiving element by the light emitted from the light emitting device as much as possible.

  An example of a problem to be solved by the present invention is to suppress erroneous detection of a light receiving element due to light emitted from a light emitting device.

The invention described in claim 1
A substrate having a first surface;
A light emitting part located on the first surface side of the substrate and having a first electrode, an organic layer and a second electrode;
A first state having a first transmittance with respect to a peak wavelength of light emitted from the light emitting portion; and a second transmittance lower than the first transmittance with respect to a peak wavelength of light emitted from the light emitting portion. A dimming region capable of transitioning to a second state;
A light receiving element positioned apart from the light emitting part;
With
The light control region is an optical device positioned between the light emitting unit and the light receiving element on the first surface side of the substrate.

It is a figure for demonstrating the optical apparatus which concerns on embodiment. It is a figure for demonstrating the 1st state of the light control area | region shown in FIG. It is a figure for demonstrating the 2nd state of the light control area | region shown in FIG. It is a figure for demonstrating the 1st example of the detail of a sensor apparatus. It is a figure for demonstrating the 2nd example of the detail of a sensor apparatus. It is sectional drawing of the 1st example of the detail of a light control area | region. It is sectional drawing of the 2nd example of the detail of a light control area | region. It is sectional drawing of the 3rd example of the detail of a light control area | region. It is sectional drawing of the 4th example of the detail of a light control area | region. It is a figure for demonstrating an example of the manufacturing method of the light control area | region shown in FIG. It is a figure for demonstrating an example of the manufacturing method of the light control area | region shown in FIG. 1 is a plan view of a light emitting device according to Example 1. FIG. It is PP sectional drawing of FIG. It is a figure for demonstrating the 1st state of the light control area | region shown in FIG. It is a figure for demonstrating the 2nd state of the light control area | region shown in FIG. It is a circuit diagram for demonstrating the 1st example of the drive method of a light-emitting device and a light control area | region. It is a circuit diagram for demonstrating the 2nd example of the drive method of a light-emitting device and a light control area | region. It is a graph for demonstrating an example of the detail of control of the light control area | region by the control circuit shown in FIG. It is a figure which shows the modification of FIG. It is a circuit diagram for demonstrating the 3rd example of the drive method of a light-emitting device and a light control area | region. It is a figure which shows the timing chart for demonstrating the 1st example of the detail of control of the light-emitting device and light control area | region by the control circuit shown in FIG. It is a figure which shows the timing chart for demonstrating the 2nd example of the detail of control of the light-emitting device and the light control area | region by the control circuit shown in FIG. FIG. 23 is a diagram for explaining details of a luminance timing chart shown in FIG. 22; 6 is a cross-sectional view of a light emitting device according to Example 2. FIG. 6 is a cross-sectional view of a light emitting device according to Example 3. FIG. It is a figure for demonstrating the 1st state of the light control area | region shown in FIG. It is a figure for demonstrating the 2nd state of the light control area | region shown in FIG. It is a figure which shows the modification of FIG. It is a figure which shows the modification of FIG. It is a figure which shows the 1st modification of FIG. It is a figure which shows the 2nd modification of FIG. It is a figure which shows the 3rd modification of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings, the same reference numerals are given to the same components, and the description will be omitted as appropriate.

  FIG. 1 is a diagram for explaining an optical device 40 according to the embodiment. FIG. 2 is a diagram for explaining a first state of the light control region 30 shown in FIG. FIG. 3 is a view for explaining a second state of the light control region 30 shown in FIG.

  The outline of the optical device 40 will be described with reference to FIG. The optical device 40 includes a substrate 100, a light emitting unit 142, a light control region 30, and a light receiving element 220. The substrate 100 has a first surface 102. The light emitting unit 142 is located on the first surface 102 side of the substrate 100 and includes the first electrode 110, the organic layer 120, and the second electrode 130. The light control region 30 has a first state (for example, the state shown in FIG. 2) having a first transmittance with respect to a peak wavelength of light emitted from the light emitting unit 142 and a peak wavelength of light emitted from the light emitting unit 142. On the other hand, it is possible to transition to a second state (for example, the state shown in FIG. 3) having a second transmittance lower than the first transmittance. The light receiving element 220 is positioned away from the light emitting unit 142. The light control region 30 is located between the light emitting unit 142 and the light receiving element 220 on the first surface 102 side of the substrate 100.

  According to the configuration described above, erroneous detection of the light receiving element 220 due to light emitted from the light emitting unit 142 (light emitting device 10) can be suppressed. Specifically, in the configuration described above, the light control region 30 is located between the light emitting unit 142 and the light receiving element 220 on the first surface 102 side of the substrate 100. Accordingly, when light is emitted from the light emitting unit 142, the light emitted from the light emitting unit 142 and traveling toward the light receiving element 220 is changed by the light control region 30 transitioning to the second state (for example, the state illustrated in FIG. 3). It can be blocked by the light control area 30. Therefore, erroneous detection of the light receiving element 220 due to light emitted from the light emitting unit 142 (light emitting device 10) can be suppressed.

  Details of the optical device 40 will be described with reference to FIG.

  The optical device 40 includes the light emitting device 10 and the sensor device 20.

  The optical device 40 can be used for an application for performing light emission and optical sensing, for example, a tail lamp with a distance measuring sensor of an automobile. In this example, the light emitting device 10 realizes a light emitting function, and the sensor device 20 realizes a light sensing function.

  The light emitting device 10 includes a substrate 100, a light emitting unit 142, a sealing unit 160, and a light control region 30. The light emitting unit 142 includes the first electrode 110, the organic layer 120, and the second electrode 130 in order from the first surface 102 of the substrate 100.

  The substrate 100 has a first surface 102 and a second surface 104. The first electrode 110, the organic layer 120, the second electrode 130, the sealing portion 160, and the light control region 30 are located on the first surface 102 side of the substrate 100. The second surface 104 is located on the opposite side of the first surface 102.

  The substrate 100 is made of a light-transmitting material. Accordingly, light can pass through the substrate 100.

The substrate 100 is made of, for example, glass or resin. The resin can be, for example, PEN (polyethylene naphthalate), PES (polyethersulfone), PET (polyethylene terephthalate) or polyimide. When the substrate 100 is made of resin, at least one of the first surface 102 and the second surface 104 of the substrate 100 may be covered with an inorganic barrier layer (for example, SiN _x or SiON). The inorganic barrier layer can prevent a substance (for example, water vapor) that can degrade the organic layer 120 from passing through the substrate 100.

  The first electrode 110 includes a transparent conductive material and has translucency. The transparent conductive material is, for example, a metal oxide (for example, Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), Indium Tungsten Zinc Oxide (IWZO), ZnO (Zinc Oxide)), or IGZO (Indium Galium Zinc Oxide). A carbon nanotube, a conductive polymer (for example, PEDOT / PSS), a light-transmitting metal thin film (for example, Ag), or a light-transmitting alloy thin film (for example, AgMg) can be used.

  The organic layer 120 includes a light emitting layer (EML) that emits light by organic electroluminescence (EL), and includes a hole injection layer (HIL), a hole transport layer (HTL), an electron transport layer (ETL), and an electron injection. A layer (EIL) may be included as appropriate. Holes are injected from the first electrode 110 into the EML, electrons are injected from the second electrode 130 into the EML, and the holes and electrons recombine in the EML to emit light.

  The second electrode 130 includes a light-shielding conductive material, and has light-shielding properties, particularly light reflectivity. The light-shielding conductive material is, for example, a metal, particularly a metal selected from the group consisting of Al, Au, Ag, Pt, Mg, Sn, Zn, and In, or an alloy of a metal selected from this group. Can do.

  In the example shown in FIG. 1, the light emitting device 10 is bottom emission. That is, the light emitted from the organic layer 120 passes through the first electrode 110 and the substrate 100 and is emitted from the second surface 104 of the substrate 100.

  In the example shown in FIG. 1, the light emitted from the organic layer 120 (light emitting unit 142) is monochromatic, specifically red, and has a peak wavelength of 600 nm or more and 750 nm or less. In another example, the light emitted from the organic layer 120 (the light emitting unit 142) may be a color other than red (for example, green or blue).

  The sealing unit 160 seals the light emitting unit 142. In the example illustrated in FIG. 1, the sealing portion 160 is a light-transmitting sealing can (for example, a glass can), and a region between the light emitting portion 142 and the sealing portion 160 is hollow. The sealing portion 160 is attached to the first surface 102, and in one example, can be adhered to the first surface 102 of the substrate 100 via an adhesive layer (not shown).

  The light control region 30 is a region capable of transitioning to a plurality of states each having a different transmittance with respect to a specific wavelength (for example, the peak wavelength of light emitted from the light emitting unit 142). In one example, the dimming region 30 can include an electrochromic (EC) element. The EC element can transition to a substantially transparent state in the first state, and can transition to a coloring state in the second state.

  In the second state, the light control region 30 can transition to a color having a high absorbance with respect to the peak wavelength of the light emitted from the light emitting unit 142. In one example, when the color of light emitted from the light emitting unit 142 is red, the dimming region 30 can transition to the blue state in the second state.

  In the example shown in FIG. 1, the light control region 30 is attached to the sealing portion 160, and in one example, can be adhered to the sealing portion 160 via an adhesive layer (not shown).

  The sensor device 20 includes a light receiving element 220. The light receiving element 220 is an element capable of converting light energy into electrical energy, for example, a photodiode (PD). In the example shown in FIG. 1, at least a part of the sensor device 20 is displaced from the first surface 102 of the substrate 100 toward the outside of the substrate 100 in the direction perpendicular to the first surface 102 of the substrate 100. In the direction along the first surface 102, at least a part of the sensor device 20 is shifted from the end of the substrate 100 toward the outside of the substrate 100.

  Details of the first state and the second state of the light control region 30 will be described with reference to FIGS. 2 and 3.

  As shown in FIG. 2 and FIG. 3, the dimming region 30 takes the first state when light is not emitted from the light emitting unit 142 (FIG. 2), and when light is emitted from the light emitting unit 142. The second state is taken (FIG. 3).

  In the example shown in FIG. 2, in the first state, the dimming region 30 is, for example, 50% to 100%, preferably, for example, in the wavelength band of visible light VL, specifically, in the wavelength band of 400 nm to 800 nm. It has an average transmittance of 80% or more and 100% or less. Therefore, the visible light VL can pass through the light control region 30.

  In particular, in the example illustrated in FIG. 2, the light control region 30 has a first transmittance with respect to a peak wavelength of light emitted from the light emitting unit 142 (for example, any one of 600 nm or more and 750 nm or less). The first transmittance is, for example, 50% or more. Therefore, the light control region 30 can also transmit light having a peak at the same wavelength as the peak wavelength of the light emitted from the light emitting unit 142.

  In the example illustrated in FIG. 2, no voltage is applied between the first electrode 110 and the second electrode 130, and no light is emitted from the light emitting unit 142 (organic layer 120). Therefore, even if the light control region 30 does not have low transmittance (for example, high absorbance or high reflectance) with respect to the wavelength of light emitted from the light emitting unit 142 (organic layer 120), the light emitting unit 142 (light emission). There is no risk of erroneous detection of the light receiving element 220 by light emitted from the apparatus 10). Therefore, as described above, the light control region 30 may have a high transmittance in the wavelength band of the visible light VL. Due to the high transmittance of the light control region 30, it is possible to suppress the loss of translucency of the light emitting device 10 due to the light control region 30.

  In the example shown in FIG. 3, in the second state, the light control region 30 has the second transmittance with respect to the peak wavelength of the light L <b> 1 emitted from the light emitting unit 142. The second transmittance is lower than the first transmittance, for example, 0% or more and 70% or less, preferably 0% or more and 30% or less. Therefore, the light control region 30 does not transmit the light L1.

  In the example illustrated in FIG. 3, a voltage is applied between the first electrode 110 and the second electrode 130, and light L <b> 1 is emitted from the light emitting unit 142 (organic layer 120). Even if the light L1 is reflected toward the sensor device 20 (light receiving element 220) by the second surface 104 of the substrate 100 due to Fresnel reflection, the light L1 may be blocked from the sensor device 20 (light receiving element 220) by the light control region 30. it can. Therefore, erroneous detection of the light receiving element 220 due to light emitted from the light emitting unit 142 (light emitting device 10) can be suppressed.

  In the example shown in FIG. 3, in the second state, the dimming region 30 has any peak wavelength of the light L1 (for example, 600 nm or more and 750 nm or less) in the wavelength band of 400 nm or more and 800 nm or less (that is, the visible light wavelength band). In the wavelength band of 100 nm excluding ()) (for example, the wavelength band of 400 nm or more and 500 nm or less), it may have an average transmittance of, for example, 50% or more and 100% or less, and preferably 80% or more and 100% or less. In this case, the light control region 30 can selectively reflect light in the wavelength band of the light L1. In other words, the light control region 30 can well transmit light in a wavelength band other than the light L1 in the visible light wavelength band. Therefore, the loss of translucency of the light emitting device 10 due to the light control region 30 can be suppressed.

  FIG. 4 is a diagram for explaining a first example of details of the sensor device 20.

  The sensor device 20 includes a light emitting element 210 and a light receiving element 220. In one example, the sensor device 20 can be a ranging sensor, in particular a LiDAR (Light Detection And Ranging). In this example, the light emitting element 210 emits light toward the outside of the sensor device 20, and the light receiving element 220 receives light emitted from the light emitting element 210 and reflected by the object. In one example, the light emitting element 210 can be an element that can convert electrical energy into light energy, such as a laser diode (LD), and the light receiving element 220 can be an element that can convert light energy into electrical energy, such as It can be a photodiode (PD). The sensor device 20 can detect the distance from the sensor device 20 to the object based on the time from when the light is emitted from the light emitting element 210 to when it is received by the light receiving element 220.

  The light receiving element 220 of the sensor device 20 detects light from the outside of the sensor device 20. Therefore, in order to prevent erroneous detection of the light receiving element 220, it is desirable to suppress the light emitted from the light emitting device 10 from entering the light receiving element 220 as much as possible. As described above, according to the example described with reference to FIGS. 1 to 3, erroneous detection of the light receiving element 220 due to light emitted from the light emitting unit 142 (light emitting device 10) can be suppressed by the dimming region 30.

  FIG. 5 is a diagram for explaining a second example of the details of the sensor device 20.

  The sensor device 20 includes a plurality of light receiving elements 220. In one example, the sensor device 20 can be an imaging sensor. In this example, the plurality of light receiving elements 220 can be elements capable of converting an image into an electric signal, for example, a charge coupled device (CCD) image sensor or a complementary metal-oxide-semiconductor (CMOS) image sensor. In one example, each light receiving element 220 can be an element capable of converting light energy into electrical energy, such as a photodiode (PD). The sensor device 20 can detect an image of an object outside the sensor device 20 by the plurality of light receiving elements 220.

  The light receiving element 220 of the sensor device 20 detects light from the outside of the sensor device 20. Therefore, in order to prevent erroneous detection of the light receiving element 220, it is desirable to suppress the amount of light emitted from the light emitting device 10 and incident on the light receiving element 220 as much as possible. As described above, according to the description with reference to FIGS. 1 to 3, erroneous detection of the light receiving element 220 due to light emitted from the light emitting unit 142 (light emitting device 10) can be suppressed by the dimming region 30.

  FIG. 6 is a cross-sectional view of a first example of details of the light control region 30. In the example shown in FIG. 6, the light control region 30 has an EC element.

  The light control region 30 includes a substrate 312, an electrode 322, an electrolyte 330, an electrode 324, and a substrate 314 in this order.

  The substrate 312 and the substrate 314 have a light-transmitting property.

  The electrode 322 and the electrode 324 have a light-transmitting property. The electrodes 322 and 324 are, for example, metal oxides, specifically, for example, indium tin oxide (ITO), tin oxide doped with fluorine (FTO), tin oxide doped with antimony (ATO), and aluminum. Made of oxidized tin oxide (AZO), zinc oxide or titanium oxide. The electrode 322 and the electrode 324 can be formed by various methods, for example, sputtering, spin coating, spray coating, dip coating, casting, or inkjet.

  In one example, the electrolyte 330 is liquid. In this example, electrolyte 330 includes a solvent and an ionized EC material dissolved in the solvent. In this example, by applying a voltage in one direction between the electrode 322 and the electrode 324, the electrochromic (EC) material is deposited on one of the electrode 322 and the electrode 324, and the dimming region 30 transitions to a colored state. Then, by applying a voltage in the opposite direction between the electrode 322 and the electrode 324, the deposited EC material is dissolved in the solvent of the electrolyte 330, and the dimming region 30 transitions to a substantially transparent state.

  FIG. 7 is a cross-sectional view of a second example of details of the light control region 30. The example shown in FIG. 7 is the same as the example shown in FIG. 6 except for the following points.

  The light control region 30 includes a substrate 312, an electrode 322, an electrochromic (EC) layer 332, an electrolyte 330, an electrode 324, and a substrate 314 in this order.

  The EC layer 332 is made of an EC material. The EC material is, for example, a metal oxide, a metal complex compound, a low molecular organic compound, or a conductive polymer. The metal oxide is, for example, tungsten oxide, molybdenum oxide, iridium oxide, or titanium oxide. The metal complex compound is, for example, Prussian blue. The low molecular organic compound is, for example, viologen, rare earth phthalocyanine, or styryl. The conductive polymer is, for example, polypyrrole, polythiophene, polyaniline, or a derivative thereof.

  The electrolyte 330 may be solid, liquid, or gel.

When the electrolyte 330 is in a liquid state, the electrolyte 330 may be any of an aqueous electrolyte solution, an organic electrolyte solution, and an ionic liquid electrolyte solution. The aqueous electrolyte solution may contain a supporting electrolyte. The supporting electrolyte is an inorganic ion salt such as an alkali metal salt or an alkaline earth metal salt, a quaternary ammonium salt, or a supporting salt of acids or alkalis. More specifically, the supporting electrolyte may be, for example, LiClO ₄ , LiBF ₄ , LiAsF ₆ , LiPF ₆ , LiCF ₃ SO ₃ , LiCF ₃ COO, KCl, NaClO ₃ , NaCl, NaBF ₄ , NaSCN, KBF ₄ , NaSCN, KBF ₄ , Mg (ClO ₄ ) ₂ or Mg (BF ₄ ) ₂ . The organic electrolyte is, for example, propylene carbonate, acetonitrile, γ-butyrolactone, ethylene carbonate, sulfolane, dioxolane, tetrahydrofuran, 2-methyltetrahydrofuran, dimethyl sulfoxide, 1,2-dimethoxyethane, 1,2-ethoxymethoxyethane, or polyethylene glycol. , Alcohols or mixed solvents thereof. In order to obtain high viscosity, a polymer may be added to the organic electrolyte. The polymer is, for example, polyacrylonitrile, carboxymethylcellulose, polyvinyl chloride, polyethylene oxide, polypropylene oxide, polyurethane, polyacrylate, polymethacrylate, polyamide, polyacrylamide, polyester, or Nafion (registered trademark). In another example, a gelling agent may be added to the organic electrolyte in order to make the organic electrolyte into a gel.

  When the electrolyte 330 is solid, the electrolyte 330 can be made of, for example, tantalum oxide.

  FIG. 8 is a sectional view of a third example of details of the light control region 30. The example shown in FIG. 8 is the same as the example shown in FIG. 7 except for the following points.

  The light control region 30 includes a substrate 312, an electrode 322, an EC layer 332, an electrolyte 330, an EC layer 334, an electrode 324, and a substrate 314 in this order.

  In one example, one of the EC layer 332 and the EC layer 334 is made of a material that can develop color by oxidation, and the other of the EC layer 332 and the EC layer 334 is substantially reduced with one of the EC layer 332 and the EC layer 334 by reduction. In other words, it may be made of a material capable of developing the same color. The voltage between the electrode 322 and the electrode 324 causes an oxidation-reduction reaction in both the EC layer 332 and the EC layer 334, and both the EC layer 332 and the EC layer 334 are colored in substantially the same color. Therefore, the coloring efficiency of the light control region 30 can be increased.

  In a detailed example, one of the EC layer 332 and the EC layer 334 may be made of Prussian blue, and the other of the EC layer 332 and the EC layer 334 may be made of tungsten oxide or viologen. Prussian blue can be colored from transparent to blue by oxidation, and tungsten oxide and viologen can be colored from transparent to blue by reduction. In this example, the light control region 30 can be colored from transparent to blue with high efficiency.

  FIG. 9 is a sectional view of a fourth example of details of the light control region 30. The upper part of FIG. 9 is a plan view of the light control region 30, and the lower part of FIG. 9 is an AA cross-sectional view of the upper part of FIG. 9. The example shown in FIG. 9 is the same as the example shown in FIG. 7 except for the following points.

  The light control region 30 has a sealing material 340. The sealing material 340 is, for example, a rubber sheet. The sealing material 340 surrounds the EC layer 332 and the electrolyte 330. The electrolyte 330 can be liquid or gel. Even if the electrolyte 330 is liquid or gel, leakage to the outside of the electrolyte 330 can be suppressed by the sealing material 340.

  10 and 11 are views for explaining an example of a manufacturing method of the light control region 30 shown in FIG. In this example, the light control region 30 is manufactured as follows.

  As shown in FIG. 10, a mask MK is disposed on the electrode 322 on the substrate 312, and an EC layer 332 is selectively deposited on the electrode 322 by the mask MK. In the example shown in FIG. 10, the EC layer 332 is made of tungsten oxide and is deposited by sputtering. Next, the mask MK is removed.

  Next, as shown in FIG. 11, a sealing material 340 is provided on the electrode 322 on the substrate 312 so that the sealing material 340 surrounds the EC layer 332. Next, an electrolyte 330 is provided in a region surrounded by the sealing material 340. When the electrolyte 330 is liquid or gel, the electrolyte 330 can be provided in the region surrounded by the sealing material 340 by pouring the electrolyte 330 into the region surrounded by the sealing material 340.

  Next, a stacked body including the substrate 314 and the electrode 324 (FIG. 9) is attached onto the electrolyte 330 so that the electrode 324 faces the electrode 322 with the electrolyte 330, the EC layer 332, and the EC layer 334 interposed therebetween.

  In this way, the light control region 30 shown in FIG. 9 is manufactured.

  As described above, according to this embodiment, erroneous detection of the light receiving element 220 due to light emitted from the light emitting unit 142 (light emitting device 10) can be suppressed.

Example 1
FIG. 12 is a plan view of the light emitting device 10 according to the first embodiment. 13 is a cross-sectional view taken along the line PP in FIG. The light emitting device 10 according to this example is the same as the light emitting device 10 according to the embodiment except for the following points.

  The light emitting device 10 includes a light emitting region 140. The light emitting region 140 includes a plurality of light emitting portions 142 and a plurality of light transmitting portions 144. As shown in FIG. 12, the plurality of light emitting portions 142 extend in the same direction as viewed from the direction perpendicular to the first surface 102 (FIG. 13) of the substrate 100. Each light emitting unit 142 includes a first electrode 110, an organic layer 120, and a second electrode 130. The first electrode 110 has translucency, and the second electrode 130 has light reflectivity. Each of the plurality of light transmitting portions 144 does not overlap with the light shielding member (for example, the second electrode 130) and is positioned between the adjacent light emitting portions 142. In this way, the plurality of light emitting units 142 and the plurality of light transmitting units 144 are alternately arranged.

  The light emitting device 10 includes a light control region 30. As shown in FIG. 12, the light control region 30 overlaps the light emitting region 140 (the plurality of light emitting units 142) when viewed from a direction perpendicular to the first surface 102 (FIG. 13) of the substrate 100. In the example shown in FIG. 12, the entire light emitting region 140 is located inside the light control region 30. Therefore, the light that can leak from the light emitting region 140 can be well blocked by the light control region 30.

  The sealing part 160 has an outer surface 162 and an inner surface 164. The outer surface 162 includes a top surface 162a and an outer surface 162b. The inner surface 164 includes a back surface 164a and an inner surface 164b. The back surface 164a is on the opposite side of the top surface 162a. The inner surface 164b is on the opposite side of the outer surface 162b.

  In the example shown in FIG. 12, the light control region 30 is attached to the outer surface 162 of the sealing portion 160, more specifically, the top surface 162 a of the sealing portion 160. In one example, the light control region 30 can be adhered to the sealing portion 160 via an adhesive layer (not shown).

  FIG. 14 is a diagram for explaining a first state of the light control region 30 shown in FIG. FIG. 15 is a diagram for explaining a second state of the light control region 30 illustrated in FIG. 13.

  In the example shown in FIG. 14, similarly to the example shown in FIG. 2, in the first state, the dimming region 30 has a high average transmittance in the wavelength band of the visible light VL. Therefore, the visible light VL can pass through the light control region 30. In particular, the light control region 30 has a high transmittance (first transmittance) with respect to the peak wavelength of light emitted from the light emitting unit 142.

  As shown in FIG. 14, the visible light VL can pass through the light transmitting portion 144. Further, as described above, the visible light VL can also pass through the light control region 30. Therefore, the light emitting device 10 can have high translucency in the first state of the light control region 30.

  In the example shown in FIG. 15, similarly to the example shown in FIG. 3, in the second state, the dimming region 30 has a low transmittance (second transmission) with respect to the peak wavelength of the light L <b> 1 emitted from the light emitting unit 142. Rate). Therefore, even if the light L1 is reflected by the second surface 104 of the substrate 100 toward the opposite side of the second surface 104 due to Fresnel reflection, the light L1 can be blocked by the dimming region 30.

  In the example shown in FIG. 15, similarly to the example shown in FIG. 3, in the second state, the dimming region 30 is in a partial wavelength band excluding the peak wavelength of the light L <b> 1 in the visible light wavelength band. It may have a high average transmittance. In this case, the loss of translucency of the light emitting device 10 due to the light control region 30 can be suppressed.

  FIG. 16 is a circuit diagram for explaining a first example of a driving method of the light emitting device 10 and the dimming region 30.

  The optical device 40 includes a drive circuit 400. The drive circuit 400 includes a first drive unit 410 and a second drive unit 420. The first driving unit 410 and the second driving unit 420 drive the light emitting device 10 and the light control region 30 independently of each other.

  FIG. 17 is a circuit diagram for explaining a second example of the driving method of the light emitting device 10 and the light control region 30. The example shown in FIG. 17 is the same as the example shown in FIG. 16 except for the following points.

The optical device 40 includes a control circuit 430 and an optical sensor 440. The optical sensor 440 detects the brightness around the dimming area 30. The optical sensor 440 may be the sensor device 20 shown in FIG. The control circuit 430 controls the second driving unit 420 based on the sensing result of the optical sensor 440 (that is, the brightness around the dimming region 30), and the visible light wavelength band in the second state is controlled. The average transmittance of the light control region 30 is controlled (hereinafter referred to as average transmittance T2 _{, VL} ).

In one example, when the brightness around the dimming area 30 is the first brightness, the control circuit 430 controls the dimming area 30 so that the average transmittance T _{2, VL} becomes the first transmittance. When the brightness around the light control region 30 is the second brightness higher than the first brightness, the average transmittance T _{2, VL} is set to the second transmittance higher than the first transmittance. The dimming area 30 is controlled. When the periphery of the light control region 30 is dark (first brightness), the light emitted from the light emitting unit 142 and leaking to the first surface 102 side of the substrate 100 is conspicuous. Therefore, the average transmittance T _{2, VL} needs to be low to some extent (first transmittance). On the other hand, when the periphery of the light control region 30 is bright (second brightness), the light emitted from the light emitting unit 142 and leaking to the first surface 102 side of the substrate 100 is not so conspicuous. Therefore, the average transmittance T2 _{, VL} may be high to some extent (second transmittance). In this way, when the periphery of the light control region 30 is dark, the amount of light emitted from the light emitting unit 142 and leaking to the first surface 102 side of the substrate 100 can be suppressed by the light control region 30, and the light control region When the periphery of 30 is bright, the loss of translucency of the light emitting device 10 due to the light control region 30 can be suppressed.

FIG. 18 is a graph for explaining an example of details of control of the light control region 30 by the control circuit 430 shown in FIG. In the graph shown in FIG. 18, the horizontal axis represents the brightness around the light control region 30, and the vertical axis represents the average transmittance T2 _{, VL} .

In the example illustrated in FIG. 18, the control circuit 430 controls the dimming region 30 so that the average transmittances T _{2 and VL} increase linearly as the brightness around the dimming region 30 increases. Therefore, when the periphery of the light control region 30 is dark, the amount of light emitted from the light emitting unit 142 and leaking to the first surface 102 side of the substrate 100 can be suppressed by the light control region 30. Is bright, the loss of translucency of the light emitting device 10 due to the light control region 30 can be suppressed.

  FIG. 19 is a diagram showing a modification of FIG.

As shown in the upper graph of FIG. 19, the control circuit 430 increases the average transmittances T _{2 and VL} in a non-linear manner, that is, in a staircase pattern as the brightness around the dimming region 30 increases. The dimming area 30 may be controlled.

As shown in the middle graph of FIG. 19, the control circuit 430 shows that the average transmittance T _{2, VL} becomes non-linear, that is, has a downward convex curve, as the brightness around the light control region 30 becomes brighter. You may control the light control area | region 30 so that it may increase.

As shown in the lower graph of FIG. 19, the control circuit 430 has an average transmittance T _{2, VL that} is non-linear, that is, in a curved shape that is convex upward, as the brightness around the dimming region 30 increases. You may control the light control area | region 30 so that it may increase.

  FIG. 20 is a circuit diagram for explaining a third example of the driving method of the light emitting device 10 and the light control region 30. The example shown in FIG. 20 is the same as the example shown in FIG. 16 except for the following points.

The control circuit 430 controls both the first drive unit 410 and the second drive unit 420, that is, both the light emitting device 10 and the dimming region 30. The control circuit 430 controls the luminance of the light emitting device 10 (hereinafter referred to as luminance L) between the first luminance (the light emitting device 10 is in an off state) and the second luminance (the light emitting device 10 is in a fully on state). (The second luminance is higher than the first luminance). Control circuit 430, the transmittance of the light control area 30 with respect to the peak wavelength of light emitted from the light emitting unit 142 (hereinafter, referred to as the transmittance T _P.) Between the first transmission and the second transmission Control (the second transmittance is lower than the first transmittance). Control circuit 430, in accordance with the transmittance T _P, it is possible to control the luminance L.

  FIG. 21 is a diagram illustrating a timing chart for explaining a first example of details of control of the light emitting device 10 and the light control region 30 by the control circuit 430 illustrated in FIG. 20.

In the timing chart shown in FIG. 21, the luminance L is changed from the first brightness to the second brightness, and the transmittance T _P is changed from the first transmittance to the second transmittance. The response speed of the light control region 30 is slower than the response speed of the light emitting device 10. Accordingly, as shown in FIG. 21, the transmittance T _P is the time required to change the second transmittance of the first transmission, than the time which the luminance L takes to change from a first luminance to a second luminance Also long. Therefore, the timing transmittance T _P is not sufficiently low (e.g., the transmittance T _P is a first luminance timing) when the luminance L reaches the second luminance, and emitted from the light emitting unit 142 the first substrate 100 Light leaking to the surface 102 side will be noticeable.

In the example shown in FIG. 21, the control circuit 430, so that the luminance L reaches the second luminance at the timing of the transmittance T _P is lower than the first transmittance, and controls the light emitting device 10 and light control area 30 Yes. Therefore, the amount of light emitted from the light emitting unit 142 and leaking to the first surface 102 side of the substrate 100 can be suppressed. Luminance L is the transmittance T _P at the time when reaching the second luminance, low it is preferable, for example, 50% of the first transmittance, preferably less than or equal to for example 10% of the first transmittance.

  FIG. 22 is a diagram illustrating a timing chart for explaining a second example of details of control of the light emitting device 10 and the light control region 30 by the control circuit 430 illustrated in FIG. 20. The timing chart shown in FIG. 22 is the same as the timing chart shown in FIG. 21 except for the following points.

In the example shown in FIG. 22, the control circuit 430, the transmittance T _P is as luminance L starts to change from a first luminance at the timing substantially the same timing began to change from a first transmission, and transmission as luminance L reaches the second luminance at the timing rate T _P is lower than the first transmittance, and controls the light emitting device 10 and light control area 30. In this example, the control circuit 430 increases the luminance L from the first luminance to the second luminance over a longer time than the normal operation time of the light emitting device 10. Therefore, the amount of light emitted from the light emitting unit 142 and leaking to the first surface 102 side of the substrate 100 can be suppressed.

  FIG. 23 is a diagram for explaining the details of the luminance L timing chart shown in FIG.

  In the upper timing chart of FIG. 23, the control circuit 430 linearly increases the luminance L from the first luminance to the second luminance.

  In the middle timing chart of FIG. 23, the control circuit 430 increases the luminance L from the first luminance to the second luminance, non-linearly, specifically, stepwise.

  In the lower timing chart of FIG. 23, the control circuit 430 increases the luminance L from the first luminance to the second luminance in a non-linear manner, specifically, in a downward convex curve.

(Example 2)
FIG. 24 is a cross-sectional view of the light emitting device 10 according to the second embodiment. The light emitting device 10 according to the present embodiment is the same as the light emitting device 10 according to the first embodiment except for the following points.

  The light control region 30 includes a substrate 312, an electrode 322, an electrolyte 330, an EC layer 334, an electrode 324, and a substrate 314 in this order from the top surface 162 a of the sealing portion 160.

  The light control region 30 further includes a conductive portion 352 (first conductive portion) and a conductive portion 354 (second conductive portion). The conductive portion 352 is between the substrate 312 and the electrode 322 and is covered with the electrode 322 (first electrode). The conductive portion 354 is between the substrate 314 and the electrode 324 and is covered with the electrode 324 (second electrode). The conductive portion 352 and the conductive portion 354 are connected to the electrode 322 and the electrode 324, respectively. The conductive portion 352 and the conductive portion 354 have higher conductivity than the electrode 322 and the electrode 324, respectively, and function as an auxiliary electrode of the electrode 322 and an auxiliary electrode of the electrode 324, respectively. The light control region 30 can obtain high color development efficiency by the conductive portion 352 and the conductive portion 354.

  The conductive portion 352 and the conductive portion 354 are metals, more specifically, for example, Cr (chromium), Cu (copper), Al (aluminum), Ag (silver), Au (gold), Mo (molybdenum), W (Tungsten) or Ni (nickel) or an alloy thereof. Among these, Ag is preferable from the viewpoint of high conductivity and high versatility (low price).

  In the example shown in FIG. 24, at least a part of the conductive part 352 and at least a part of the conductive part 354 overlap with the second electrode 130. Furthermore, each of the width of the conductive portion 352 and the width of the conductive portion 354 is narrower than the width of the second electrode 130. In the direction along the first surface 102 of the substrate 100, the conductive portion 352 and the conductive portion 354 are It is located inside the second electrode 130. In this case, even if the electroconductive part 352 and the electroconductive part 354 have light-shielding property, the loss of the translucency of the light-emitting device 10 by the light control area | region 30 can be suppressed.

(Example 3)
FIG. 25 is a cross-sectional view of the light emitting device 10 according to the third embodiment. FIG. 26 is a diagram for describing the first state of the light control region 30 illustrated in FIG. 25. FIG. 27 is a diagram for explaining a second state of the light control region 30 illustrated in FIG. 25. The light emitting device 10 according to the present embodiment is the same as the light emitting device 10 according to the first embodiment except for the following points.

  The structure of the light emitting device 10 will be described with reference to FIG.

  Similar to the first electrode 110, the second electrode 130 has translucency. The light control region 30 is located on the second electrode 130. The dimming region 30 has a first state (for example, the state shown in FIG. 26) having a first reflectance with respect to a peak wavelength of light emitted from the light emitting unit 142 and a peak wavelength of light emitted from the light emitting unit 142. On the other hand, it is possible to transition to a second state (for example, the state shown in FIG. 27) having a second reflectance lower than the first reflectance.

  According to the configuration described above, when light is not emitted from the organic layer 120, the light control region 30 transitions to the first state, whereby the transmittance of the light emitting device 10 can be increased (for example, FIG. 26). ), When light is emitted from the organic layer 120, the light emitted from the organic layer 120 toward the light control region 30 is changed to the opposite side of the light control region 30 by the transition of the light control region 30 to the second state. It can reflect toward the side (substrate 100 side) (for example, FIG. 27).

  The light control region 30 includes a buffer layer 360, an electrode 322, an EC layer 332, a catalyst layer 336, an electrolyte 330, and an electrode 324 in this order from the second electrode 130. The buffer layer 360 can be formed on the second electrode 130 by, for example, vacuum deposition. The electrode 322, the EC layer 332, the catalyst layer 336, the electrolyte 330, and the electrode 324 can be sequentially formed by, for example, sputtering.

  The electrode 322, the electrode 324, the electrolyte 330, and the buffer layer 360 are translucent.

  The electrolyte 330 can be solid. The electrolyte 330 can be made of, for example, tantalum oxide.

  The EC layer 332 can transition to a transparent state (for example, the state shown in FIG. 26) by hydrogenation, and can transition to a reflective state (for example, the state shown in FIG. 27) by dehydrogenation. Hydrogenation and dehydrogenation are reversible reactions. By applying a voltage in one direction between the electrode 322 and the electrode 324, hydrogenation can be caused. By applying a voltage in the opposite direction between the electrode 322 and the electrode 324, dehydrogenation is caused. Can be made. The material of the EC layer 332 is, for example, a rare earth-magnesium alloy of Y—Mg, La—Mg, Gd—Mg, or Sm—Mg; a magnesium-transition metal of Mg—Ni, Mg—Mn, Mg—Co, or Mg—Fe An alloy; an alloy containing at least one element selected from Group 2 elements and two or more elements selected from Group 3 elements and rare earth elements; or a hydride of the above-described alloy.

  The catalyst layer 336 has a function for promoting hydrogenation and dehydrogenation of the EC layer 332. The material of the catalyst layer 336 is, for example, at least one metal selected from palladium, platinum, a palladium alloy, or a platinum alloy, and is preferably palladium from the viewpoint of hydrogen permeability.

  Details of the first state and the second state of the light control region 30 will be described with reference to FIGS. 26 and 27.

  In the example shown in FIG. 26, in the first state, the dimming region 30 is, for example, 40% or more and 100% or less, preferably, It has an average transmittance of 80% or more and 100% or less. Therefore, the visible light VL can pass through the light control region 30.

  In particular, in the example illustrated in FIG. 26, the light control region 30 has a first reflectance with respect to the peak wavelength of light emitted from the light emitting unit 142 (for example, any of 600 nm or more and 750 nm or less). The first reflectance is, for example, less than 30%. Therefore, the light control region 30 can also transmit light having a peak at the same wavelength as the peak wavelength of the light emitted from the light emitting unit 142.

  In the example shown in FIG. 26, no voltage is applied between the first electrode 110 and the second electrode 130, and no light is emitted from the light emitting unit 142 (organic layer 120). Therefore, the light control area | region 30 does not need to have a high reflectance with respect to the wavelength of the light emitted from the light emission part 142 (organic layer 120). Therefore, the loss of translucency of the light emitting device 10 due to the light control region 30 can be suppressed.

  In the example shown in FIG. 27, in the second state, the light control region 30 has the second reflectance with respect to the peak wavelength of the light L1 emitted from the light emitting unit 142. The second reflectance is higher than the first reflectance, for example, 60% or more and 100% or less, preferably 80% or more and 100% or less. Therefore, the light control region 30 can reflect the light L1.

  In the example shown in FIG. 27, a voltage is applied between the first electrode 110 and the second electrode 130, and light L <b> 1 is emitted from the organic layer 120. Even when the light L1 is directed toward the light control region 30, the light L1 can be reflected by the light control region 30 toward the opposite side (substrate 100 side) of the light control region 30.

  FIG. 28 is a diagram showing a modification of FIG.

  As shown in FIG. 28, the light control region 30 may not include a buffer layer (a layer corresponding to the buffer layer 360 shown in FIG. 25), and the second electrode 130 may function as the electrode 322. Good. In this example, similarly to the example shown in FIG. 25, when light is not emitted from the organic layer 120, the light control region 30 transitions to the first state, thereby increasing the transmittance of the light emitting device 10. When light is emitted from the organic layer 120, the light emitted from the organic layer 120 toward the light control region 30 can be changed by the light control region 30 transitioning to the second state. It can reflect toward the opposite side (substrate 100 side) of 30.

  FIG. 29 is a diagram showing a modification of FIG.

  In the example shown in FIG. 29, the light emitting device 10 is top emission. The first electrode 110 has light reflectivity, and the second electrode 130 has light transmittance. Therefore, the light emitted from the organic layer 120 passes through the second electrode 130 and is emitted from the sealing unit 160.

  The light control region 30 is located between the light emitting unit 142 and the light receiving element 200 on the second surface 104 side of the substrate 100. In particular, in the example shown in FIG. 29, it is attached to the second surface 104 of the substrate 100, and in one example, it can be adhered to the second surface 104 of the substrate 100 via an adhesive layer (not shown). Therefore, similarly to the example shown in FIG. 1, it is possible to suppress erroneous detection of the light receiving element 220 due to light emitted from the light emitting unit 142 (light emitting device 10).

  FIG. 30 is a diagram showing a first modification of FIG.

  As shown in FIG. 30, the light control region 30 may be attached not only to the top surface 162 a of the sealing portion 160 but also to the outer side surface 162 b of the sealing portion 160.

  FIG. 31 is a diagram showing a second modification of FIG.

  As shown in FIG. 31, the light control region 30 may be attached to the inner surface 164 of the sealing portion 160, and in particular in the example shown in FIG. 31, it is attached to the back surface 164 a and the inner side surface 164 b of the sealing portion 160. ing.

  FIG. 32 is a diagram showing a third modification of FIG.

  As shown in FIG. 32, the light control region 30 may be attached to both the outer surface 162 and the inner surface 164 of the sealing portion 160. In the example shown in FIG. 32, the top surface 162a of the sealing portion 160 and It is attached to the back surface 164a.

  As mentioned above, although embodiment and the Example were described with reference to drawings, these are illustrations of this invention and can also employ | adopt various structures other than the above.

DESCRIPTION OF SYMBOLS 10 Light-emitting device 20 Sensor apparatus 30 Light control area 40 Optical device 100 Board | substrate 102 1st surface 104 2nd surface 110 1st electrode 120 Organic layer 130 2nd electrode 140 Light-emitting area 142 Light-emitting part 144 Light-transmitting part 160 Sealing part 162 Outer surface 162a Top surface 162b Outer surface 164 Inner surface 164a Back surface 164b Inner surface 200 Light receiving element 210 Light emitting element 220 Light receiving element 312 Substrate 314 Substrate 322 Electrode 324 Electrode 330 Electrolyte 332 EC layer 334 EC layer 336 Catalyst layer 340 Sealing material 352 Conductive part 354 Conductive part 360 Buffer layer 400 Drive circuit 410 First drive unit 420 Second drive unit 430 Control circuit 440 Optical sensor

Claims (9)

A substrate having a first surface;
A light emitting part located on the first surface side of the substrate and having a first electrode, an organic layer and a second electrode;
A first state having a first transmittance with respect to a peak wavelength of light emitted from the light emitting portion; and a second transmittance lower than the first transmittance with respect to a peak wavelength of light emitted from the light emitting portion. A dimming region capable of transitioning to a second state;
A light receiving element positioned apart from the light emitting part;
With
The said light control area | region is an optical apparatus located between the said light emission part and the said light receiving element in the said 1st surface side of the said board | substrate. The optical device according to claim 1,
It is located on the first surface side of the substrate, has translucency, and further comprises a sealing portion that seals the light emitting portion,
The said light control area | region is an optical apparatus attached to the said sealing part. The optical device according to claim 2,
The said light control area | region is an optical apparatus attached to the outer surface of the said sealing part. The optical device according to any one of claims 1 to 3,
A plurality of the light emitting units,
Each second electrode of the plurality of light emitting units has light reflectivity,
The optical device, wherein the plurality of light emitting units extend in the same direction when viewed from a direction perpendicular to the first surface. The optical device according to any one of claims 1 to 4, wherein:
The light control region is an optical device that overlaps with the light emitting unit when viewed from a direction perpendicular to the first surface. The optical device according to any one of claims 1 to 5,
The said light control area | region is an optical apparatus which has an electrochromic element. The optical device according to claim 6.
The electrochromic element is connected to the first electrode, the second electrode, the first electrode, has a higher conductivity than the first electrode, and is connected to the second electrode, A second conductive part having a higher conductivity than the two electrodes,
An optical device, wherein at least a part of the first conductive part and at least a part of the second conductive part overlap the second electrode when viewed from a direction perpendicular to the first surface. The optical device according to claim 7.
Each of the width | variety of the said 1st electroconductive part and the width | variety of the said 2nd electroconductive part is an optical apparatus narrower than the width | variety of the said 2nd electrode. The optical device according to any one of claims 1 to 8,
The light control region is an optical device that takes the first state when light is not emitted from the light emitting unit and takes the second state when light is emitted from the light emitting unit.

Images