JP2022140469A - optical device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress erroneous detection of a light receiving element due to light emitted from a light-emitting device.

SOLUTION: A substrate 100 has a first surface 102 and a second surface 104. The second surface 104 is on the opposite side from the first surface 102. A sealing member 300 has light transmissivity. The sealing member 300 has a side wall 310. A first part 400 is located on a second surface 104 side of the substrate 100. The first part 400 has a surface 402. A surface 402 of the first part 400 is inclined to a direction X. Especially, the surface 402 of the first part 400 is inclined along the direction X from a direction on the opposite side to the first side S1 toward the first side S1.

SELECTED DRAWING: Figure 3

COPYRIGHT: (C)2022,JPO&INPIT

Description

The present invention relates to optical devices.

In recent years, organic light emitting diodes (OLEDs) have been developed as light emitting devices. An 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 section. The organic layer can emit light by organic electroluminescence (EL) according to a voltage between the first electrode and the second electrode.

Patent Literature 1 describes an example of an OLED. The OLED includes a transparent substrate having a first side and a second side opposite the first side. A first electrode, an organic layer and a second electrode are located on the first surface side of the transparent substrate. A polymer is located on the second surface side of the transparent substrate. Random unevenness is continuously formed on the surface of the polymer.

Patent Literature 2 describes an example of a lighting fixture. A lighting fixture includes a light source, a sensor and a shielding member. The light source is switched on or off based on the detection result of the sensor. Light or heat from the light source may cause erroneous detection in the sensor. In Patent Document 2, a shielding member shields the sensor from the light source. Therefore, erroneous detection by the sensor due to the light source can be suppressed.

WO2008/096748 JP 2010-27441 A

As described above, OLEDs have recently been developed as light-emitting devices. In certain applications (e.g., automotive taillights), such light-emitting devices may be used in conjunction with devices (e.g., photosensors or imagers) having light receiving elements (e.g., photodiodes (PDs)). be. In this case, it is necessary to suppress erroneous detection of the light receiving element due to light emitted from the light emitting device as much as possible.

One example of the 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 first invention is
a substrate having a first side and a second side opposite the first side;
a light-emitting portion positioned on the first surface side of the substrate and including a first electrode, an organic layer and a second electrode;
a translucent sealing member having a side wall positioned closer to the edge of the substrate than the light emitting portion in one direction along the first surface or the second surface;
a first portion located on the second surface side of the substrate and located closer to the end portion side of the substrate than the light emitting portion in the one direction;
a light receiving element;
including
The first portion is an optical device having a surface inclined with respect to the one direction.

The second invention is
a substrate having a first surface;
a light-emitting portion located on the first surface side of the substrate and having a first electrode, an organic layer and a second electrode;
a sealing member having a side wall that is translucent and located closer to the edge of the substrate than the light emitting portion in one direction along the first surface;
a first portion located on the first surface side of the substrate and located closer to the end portion side of the substrate than the light emitting portion in the one direction;
a light receiving element;
including
The first portion is an optical device having a surface inclined with respect to the one direction.

It is a figure for demonstrating the optical apparatus which concerns on embodiment. FIG. 2 is a plan view of the light emitting device shown in FIG. 1; FIG. 3 is a cross-sectional view taken along line PP of FIG. 2; It is a figure for demonstrating an example of operation|movement of the light-emitting device which concerns on embodiment. It is a figure for demonstrating an example of operation|movement of the light-emitting device which concerns on a comparative example. FIG. 2 is a diagram for explaining a first example of details of a sensor device; FIG. 10 is a diagram for explaining a second example of details of the sensor device; 1 is a plan view of a light emitting device according to an example; FIG. FIG. 9 is a cross-sectional view taken along the line AA of FIG. 8; FIG. 9 is a first example of a cross-sectional view taken along the line BB of FIG. 8; FIG. 11 is a graph of a first simulation result of sidewall brightness when viewed from the first surface side of the substrate; FIG. 9 is a second example of a cross-sectional view taken along the line BB of FIG. 8; FIG. 10 is a graph of a second simulation result of sidewall brightness when viewed from the first surface side of the substrate; 9 is a third example of a cross-sectional view taken along the line BB of FIG. 8. FIG. FIG. 11 is a graph of a third simulation result of sidewall brightness when viewed from the first surface side of the substrate; It is the first of the fourth example of the BB cross-sectional view of FIG. This is the second example of the fourth example of the BB cross-sectional view of FIG. It is the third of the fourth example of the BB cross-sectional view of FIG. It is the fourth of the fourth example of the BB cross-sectional view of FIG. It is the fifth example of the fourth example of the BB cross-sectional view of FIG. It is the sixth example of the fourth example of the BB cross-sectional view of FIG. FIG. 11 is a diagram showing a graph of a fourth simulation result of sidewall brightness when viewed from the first surface side of the substrate; FIG. 9 is a fifth example of the BB cross-sectional view of FIG. 8; FIG. 10 is a graph of a fifth simulation result of sidewall brightness when viewed from the first surface side of the substrate; FIG. 9 is a sixth example of a cross-sectional view taken along the line BB of FIG. 8; FIG. 12 is a graph of a sixth simulation result of sidewall brightness when viewed from the first surface side of the substrate; FIG. 9 is a seventh example of a cross-sectional view taken along the line BB of FIG. 8; FIG. 13 is a graph of a seventh simulation result of sidewall brightness when viewed from the first surface side of the substrate; FIG. 3 is a diagram showing a modification of FIG. 2; FIG. 30 is a diagram for explaining an example of the operation of the light emitting device shown in FIG. 29; It is a figure for demonstrating an example of operation|movement of the light-emitting device which concerns on a comparative example.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in all the drawings, the same constituent elements are denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

FIG. 1 is a diagram for explaining an optical device 30 according to an embodiment. FIG. 2 is a plan view of the light emitting device 10 shown in FIG. 1. FIG. 3 is a cross-sectional view taken along line PP of FIG. 2. FIG.

The outline of the optical device 30 will be described with reference to FIGS. 1 to 3. FIG. The optical device 30 includes a substrate 100 , a light emitting section 142 , a sealing member 300 , a first portion 400 and a light receiving element 220 . Substrate 100 has a first side 102 and a second side 104 . The second side 104 is opposite the first side 102 . The substrate 100 has a first side 106a. The first side 106 a is the end of the first side S<b>1 in the direction X along the first surface 102 or the second surface 104 . The light emitting section 142 is positioned on the first surface 102 side of the substrate 100 . The light emitting portion 142 has an end portion on the first side S1 side in the X direction. The light emitting part 142 includes a first electrode 110, an organic layer 120 and a second electrode 130. As shown in FIG. The sealing member 300 has translucency. The sealing member 300 has side walls 310 . The side wall 310 is positioned closer to the first side S1 than the end portion of the light emitting portion 142 in the X direction. The first portion 400 is located on the second surface 104 side of the substrate 100 . The first portion 400 is positioned closer to the first side S1 than the end portion of the light emitting portion 142 in the X direction. First portion 400 has a surface 402 . A surface 402 of the first portion 400 is inclined with respect to the direction X. As shown in FIG. Specifically, in the example shown in FIG. 3, the surface 402 of the first portion 400 is inclined along the direction X from the direction opposite the first side S1 toward the first side S1.

According to the configuration described above, erroneous detection of the light receiving element 220 due to light emitted from the light emitting device 10 can be suppressed. Specifically, in the configuration described above, the surface 402 of the first portion 400 is inclined along the direction X from the direction opposite to the first side S1 toward the first side S1. As will be described later with reference to FIGS. 4 and 5, the amount of light leaking from the side wall 310 of the sealing member 300 can be suppressed by the inclination of the surface 402. FIG. Therefore, erroneous detection of the light receiving element 220 due to light emitted from the light emitting device 10 can be suppressed.

Details of the optical device 30 will be described with reference to FIG.

The optical device 30 includes the light emitting device 10 and the sensor device 20 .

The sensor device 20 can be used in applications for light emission and light sensing, for example, tail lamps with range sensors in automobiles. In this example, the light emitting device 10 realizes the function of light emission, and the sensor device 20 realizes the function of light sensing.

The light-emitting device 10 includes a substrate 100 , a light-emitting portion 142 and a sealing member 300 . The light emitting part 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 .

Substrate 100 has a first side 102 and a second side 104 . The first electrode 110 , the organic layer 120 , the second electrode 130 and the sealing member 300 are located on the first surface 102 side of the substrate 100 . The second surface 104 is located opposite the first surface 102 . The second surface 104 is in contact with a region (eg, air) having a refractive index lower than that of the substrate 100 .

The substrate 100 is made of a translucent material. Therefore, light can pass through the substrate 100 .

The substrate 100 is made of glass or resin, for example. The resin can be, for example, PEN (polyethylene naphthalate), PES (polyether sulfone), 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 (eg, _SiNx or SiON). The inorganic barrier layer can prevent substances (eg, water vapor) that can degrade the organic layer 120 from penetrating through the substrate 100 .

The first electrode 110 contains a transparent conductive material and has translucency. The transparent conductive material is, for example, a metal oxide (e.g., ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), IWZO (Indium Tungsten Zinc Oxide), ZnO (Zinc Oxide)) or IGZO (Indium Gallium Zinc Oxide), Carbon nanotubes, conductive polymers (eg, PEDOT/PSS), translucent metal thin films (eg, Ag), or translucent alloy thin films (eg, AgMg) can be used.

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

The second electrode 130 contains 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 metals selected from this group. can be done.

In the example shown in FIG. 1, the light emitting device 10 is bottom emitting. 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 .

The sealing member 300 seals the light emitting section 142 . In the example shown in FIG. 1 , the sealing member 300 is a translucent sealing can (eg, glass can) and includes side walls 310 and a lid 320 . In the example shown in FIG. 1, the region between the light emitting section 142 and the sealing member 300 is hollow. The sealing member 300 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). In another example, the area between the light emitting section 142 and the sealing member 300 may be filled with liquid. In one example, the liquid can be fluorinated oil. In yet another example, the region between the light-emitting portion 142 and the sealing member 300 may be filled with a solid. In one example, the solid can be a hardened version of a curable liquid (eg, a liquid curable by UV curing).

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, such as a photodiode (PD). The sensor device 20 is positioned outside the light emitting device 10 . In the example shown in FIG. 1, the light receiving element 220 is displaced from the first surface 102 of the substrate 100 toward the outside of the substrate 100 in a direction perpendicular to the first surface 102 of the substrate 100. In the direction along 102 it is offset towards the outside of the sealing member 300 . When the light receiving element 220 is at this position, the light receiving element 220 is likely to erroneously detect light leaking from the side wall 310 of the sealing member 300 . In contrast, in the present embodiment, as described above, the amount of light leaking from the side wall 310 of the sealing member 300 can be suppressed, so erroneous detection of the light receiving element 220 can be suppressed.

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

In the example shown in FIG. 2, the substrate 100 has a substantially rectangular shape and has a first side 106a, a second side 106b, a third side 106c and a fourth side 106d. The first side 106a extends in the Y direction. The second side 106b is opposite the first side 106a. The third side 106c is between the first side 106a and the second side 106b and extends in a direction (direction X) intersecting the first side 106a. The fourth side 106d is on the opposite side of the third side 106c. In other examples, substrate 100 may have a shape other than rectangular.

Side wall 310 surrounds light emitting portion 142 . Lid 320 spans the entire area enclosed by side walls 310 . Thus, the light emitting part 142 is shielded from the outside by the sidewall 310 and the lid 320 of the sealing member 300 .

In the example shown in FIG. 2, the first portion 400 surrounds the light emitter 142 . The first portion 400 may extend continuously so as to surround the light emitting section 142 , or may extend intermittently so as to surround the light emitting section 142 .

Details of the first portion 400 will be described with reference to FIG.

FIG. 3 shows a section along direction X. FIG. The first side S1 indicates the edge of the substrate 100 in the direction X (for example, the first side 106a shown in FIG. 2).

In the example shown in FIG. 3 , the first portion 400 has a shape protruding from the second surface 104 of the substrate 100 . More specifically, first portion 400 has a semicircular shape. Accordingly, the first portion 400 has a surface 402 that is inclined along the direction X from the direction opposite the first side S1 toward the first side S1. Therefore, as will be described later with reference to FIGS. 4 and 5, the amount of light leaking from the side walls 310 of the sealing member 300 can be suppressed.

The shape of the first portion 400 may not be strictly semicircular, and may be semielliptical, for example. In another example, first portion 400 may have a triangular shape. In this example, the shape of the first portion 400 may not be strictly triangular, but may be triangular with rounded corners.

In the example shown in FIG. 3 , the width of first portion 400 is substantially equal to the width of sidewall 310 , and the center of first portion 400 is substantially aligned with the center of sidewall 310 in direction X. there is In other examples, the width of first portion 400 may differ from the width of sidewall 310 , and the center of first portion 400 may be offset from the center of sidewall 310 in direction X.

In the example shown in FIG. 3, first portion 400 is a member attached to substrate 100 . The first portion 400 can be adhered to the substrate 100 by, for example, an optical adhesive. In other examples, first portion 400 may be integral with substrate 100 . In this example, the first portion 400 can be formed by processing the second surface 104 of the substrate 100 .

FIG. 4 is a diagram for explaining an example of the operation of the light emitting device 10 according to the embodiment. FIG. 5 is a diagram for explaining an example of the operation of the light emitting device 10 according to the comparative example.

The light emitting device 10 according to the comparative example (FIG. 5) is the same as the light emitting device 10 according to the embodiment (FIG. 4) except that the first portion 400 is not provided.

As indicated by black arrows in FIGS. 4 and 5, light emitted from the light emitting portion 142 (eg, FIG. 1) may propagate through the substrate 100 due to total internal reflection. In the comparative example ( FIG. 5 ), this light easily propagates from the substrate 100 to the sealing member 300 . Therefore, the light emitted from the light emitting section 142 may leak through the side wall 310 of the sealing member 300 . In contrast, in the embodiment (FIG. 4), this light is incident on the surface 402 of the first portion 400 at a small angle of incidence and tends to be transmitted through the surface 402 . Therefore, the amount of light propagating from the substrate 100 to the sealing member 300 can be suppressed, and the amount of light leaking from the side wall 310 of the sealing member 300 can be suppressed.

In one example, the refractive index of the first member 310 may be lower than the refractive index of the substrate 100 . In particular, the first member 310 may be made of a material with a lower refractive index than glass. If the refractive index of the first member 310 is somewhat low, for example lower than the refractive index of the substrate 100, the amount of light leaking from the surface 312 of the first member 310 can be suppressed.

FIG. 6 is a diagram for explaining a first example of details of the sensor device 20. As shown in FIG.

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 the 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 capable of converting electrical energy into optical energy, such as a laser diode (LD), and the light receiving element 220 can be an element capable of converting optical 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 until it is received by the light receiving element 220 .

The light receiving element 220 of the sensor device 20 detects light from outside the sensor device 20 . Therefore, in order to prevent erroneous detection of the light receiving element 220, it is desirable to prevent 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 section 142 (light emitting device 10) can be suppressed.

FIG. 7 is a diagram for explaining a second example of details of the sensor device 20. As shown in FIG.

The sensor device 20 includes multiple 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 images into electrical signals, such as CCD (Charge Coupled Device) image sensors or CMOS (Complementary Metal-Oxide-Semiconductor) image sensors. 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 with the plurality of light receiving elements 220 .

The light receiving element 220 of the sensor device 20 detects light from outside 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 section 142 (light emitting device 10) can be suppressed.

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

FIG. 8 is a plan view of the light emitting device 10 according to the example. 9 is a cross-sectional view taken along line AA of FIG. 8. FIG. FIG. 10 is a first example of a BB cross-sectional view of 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.

In the simulation, the light emitting device 10 shown in FIGS. 8 to 10 was examined.

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

Light-emitting device 10 includes a light-emitting region 140 . The light emitting region 140 has translucency. Specifically, the light-emitting region 140 includes a plurality of light-emitting portions 142 and a plurality of light-transmitting portions 144 . The plurality of light-emitting portions 142 and the plurality of light-transmitting portions 144 extend in the Y direction and are alternately arranged in the X direction. Light from the outside of the light emitting device 10 can pass through each translucent portion 144 . Therefore, the light emitting region 140 has translucency.

In the example shown in FIG. 8, the sidewall 310 and the first portion 400 extend in the direction Y between the third side 106c of the substrate 100 and the end of the light emitting region 140 on the third side 106c side. The side wall 310 shown in FIG. 8 is virtually placed as part of the sealing member in the simulation.

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

The light emitting part 142 includes a first electrode 110, an organic layer 120 and a second electrode 130. As shown in FIG. The first electrode 110 , the organic layer 120 and the second electrode 130 are stacked in order from the first surface 102 of the substrate 100 . 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 .

The translucent part 144 does not overlap the light shielding member (for example, the second electrode 130). Therefore, light from the outside of the light emitting device 10 can pass through the translucent portion 144 .

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

Substrate 100 has a thickness T between first surface 102 and second surface 104 . Sidewall 310 has a height H from first surface 102 of substrate 100 . Sidewall 310 has a width W at a portion in contact with first surface 102 of substrate 100 . The first portion 400 has a width W at the portion in contact with the second surface 104 of the substrate 100 . In the direction X, the center of the first portion 400 is shifted from the center of the side wall 310 to the side opposite to the first side S1 by a distance Δ (Δ≧0). The first portion 400 has a semicircular shape protruding from the second surface 104 of the substrate 100 .

The simulation conditions are as follows. The refractive index of the side wall 310 is the same as that of the substrate 100, which is 1.52. The light distribution of the light emitting unit 142 is the distribution of the Lambertian light source.

FIG. 11 is a graph showing a first simulation result of the brightness of the side wall 310 viewed from the first surface 102 side of the substrate 100. As shown in FIG.

The examples in FIG. 11 show cases where the distance Δ is 0, W/4, W/2, 3W/4, W and 5W/4 in FIG. When the distance Δ is 0, the entire first portion 400 overlaps the sealing member 300, and when the distance Δ is W/4, W/2 and 3W/4, a portion of the first portion 400 overlaps the sealing member. 300 and the distance Δ is W and 5W/4, no part of the first portion 400 overlaps the sealing member 300 . The comparative example in FIG. 11 is similar to the example shown in FIG. 10 except that the first portion 400 is not provided.

In the comparative example, luminance peaks appear at both ends of the sidewall 310 . The peak on the right side in the graph of FIG. 11 is the peak at the position corresponding to the end of the first side S1 of the side wall 310 . On the other hand, in the embodiment, the luminance peak at the end of the side wall 310 on the first side S1 is suppressed regardless of the value of the distance Δ. Therefore, in the direction X, the center of the first portion 400 may be aligned with the center of the side wall 310 or may be offset from the center of the side wall 310 to the opposite side of the first side S1.

FIG. 12 is a second example of the BB cross-sectional view of FIG. The example shown in FIG. 12 is similar to the example shown in FIG. 10, except for the following points.

The first portion 400 has a triangular shape protruding from the second surface 104 of the substrate 100 . This triangle in FIG. 12 is an isosceles triangle with a base that is shared with the second surface 104 of the substrate 100 . A face 402 of the first portion 400 constitutes one side of this isosceles triangle, and is inclined along the direction X at an angle θ from a direction opposite to the first side S1 toward the first side S1.

FIG. 13 is a graph showing a second simulation result of the brightness of the sidewall 310 viewed from the first surface 102 side of the substrate 100. As shown in FIG.

The example in FIG. 13 shows the cases where the angles θ are 30°, 40°, 45°, 50° and 60° in FIG. The comparative example in FIG. 13 is similar to the example shown in FIG. 12 except that the first portion 400 is not provided.

In the comparative example, luminance peaks appear at both ends of the sidewall 310 . The right peak in the graph of FIG. 13 is the peak at the position corresponding to the end of the first side S1 of the side wall 310 . In contrast, in the embodiment, the luminance peak at the end of the first side S1 of the side wall 310 is suppressed regardless of the value of the angle θ. In particular, when the angles θ are 45°, 50°, and 60°, the luminance peaks at the ends of the first side S1 of the sidewall 310 are well suppressed. Therefore, in one example, it is desirable that the angle θ is 45° or more. In particular, it can be said that the angle θ at which the luminance peak is suppressed may depend on the refractive index of the first portion 400 . Therefore, from the results shown in FIG. 13, when the refractive index of the first portion 400 is 1.52 or its vicinity (for example, 1.30 or more and 1.70 or less, preferably 1.40 or more and 1.60 or less), It can be said that the angle θ is preferably 45° or more.

FIG. 14 is a third example of a BB cross-sectional view of FIG. The example shown in FIG. 14 is similar to the example shown in FIG. 10, except for the following points.

The first portion 400 has a triangular shape protruding from the second surface 104 of the substrate 100 . This triangle in FIG. 14 is a right triangle with its hypotenuse on face 402 . The surface 402 of the first portion 400 constitutes the hypotenuse of this right-angled triangle and is inclined along the direction X by an angle θ from the direction opposite to the first side S1 toward the first side S1.

FIG. 15 is a graph showing a third simulation result of the brightness of the side wall 310 viewed from the first surface 102 side of the substrate 100. As shown in FIG.

The example in FIG. 15 shows angles θ of 30°, 45° and 60° in FIG. The comparative example in FIG. 15 is similar to the example shown in FIG. 14 except that the first portion 400 is not provided.

In the comparative example, luminance peaks appear at both ends of the sidewall 310 . The right peak in the graph of FIG. 15 is the peak at the position corresponding to the end of the first side S1 of the side wall 310 . In contrast, in the embodiment, the luminance peak at the end of the first side S1 of the side wall 310 is suppressed regardless of the value of the angle θ. In particular, when the angles .theta. Therefore, in one example, it is desirable that the angle θ is 45° or more. In particular, it can be said that the angle θ at which the luminance peak is suppressed may depend on the refractive index of the first portion 400 . Therefore, from the results shown in FIG. 15, when the refractive index of the first portion 400 is 1.52 or its vicinity (for example, 1.30 or more and 1.70 or less, preferably 1.40 or more and 1.60 or less), It can be said that the angle θ is preferably 45° or more.

FIG. 16 is the first of the fourth example of the BB cross-sectional view of FIG. The example shown in FIG. 16 is similar to the example shown in FIG. 10, except for the following points.

The first portion 400 has a triangular shape protruding from the second surface 104 of the substrate 100 . This triangle in FIG. 16 is an isosceles triangle with a base (length: W/2) shared with the second surface 104 of the substrate 100 . The surface 402 of the first portion 400 constitutes one side of this isosceles triangle and is inclined along the direction X by 45° from the direction opposite to the first side S1 toward the first side S1. In the direction X, the end of the first portion 400 opposite the first side S1 is aligned with the end of the side wall 310 opposite the first side S1.

FIG. 17 is the second of the fourth example of the BB cross-sectional view of FIG. The example shown in FIG. 17 is similar to that of FIG. Similar to the example shown.

FIG. 18 is the third of the fourth example of the BB cross-sectional view of FIG. The example shown in FIG. 18 is similar to the example shown in FIG. 16 except that the two first portions 400 are aligned along the second surface 104 of the substrate 100. In the example shown in FIG. In the example shown in FIG. 18, the end of one of the first portions 400 opposite the first side S1 is aligned with the end of the side wall 310 opposite the first side S1, and the other end of the side wall 310 The end of the first side S1 of the first portion 400 of is aligned with the end of the side wall 310 of the first side S1.

FIG. 19 is the fourth of the fourth example of the BB cross-sectional view of FIG. The example shown in FIG. 19 is similar to the example shown in FIG. 16 except that the first portion 400 has a semicircular shape protruding from the second surface 104 of the substrate 100 .

FIG. 20 is the fifth example of the fourth example of the BB cross-sectional view of FIG. The example shown in FIG. 20 is similar to the example shown in FIG. 17, except that the first portion 400 has a semicircular shape protruding from the second surface 104 of the substrate 100 .

FIG. 21 is the sixth of the fourth example of the BB cross-sectional view of FIG. The example shown in FIG. 21 is similar to the example shown in FIG. 18, except that the first portion 400 has a semicircular shape protruding from the second surface 104 of the substrate 100 .

FIG. 22 is a diagram showing a graph of a fourth simulation result of the brightness of the sidewall 310 viewed from the first surface 102 side of the substrate 100. As shown in FIG.

The example in FIG. 22 shows the example of FIGS. 16-21. The comparative example in FIG. 22 is similar to the example shown in FIGS. 16 to 21 except that the first portion 400 is not provided.

In the comparative example, luminance peaks appear at both ends of the sidewall 310 . The right peak in the graph of FIG. 22 is the peak at the position corresponding to the end of the first side S1 of the side wall 310 . On the other hand, in the embodiment, in any of the examples of FIGS. 16 to 21, the luminance peak at the end of the first side S1 of the side wall 310 is suppressed. Therefore, in one example, it is desirable that the width of the first portion 400 is 50% or more of the width of the side wall 310 .

FIG. 23 is a fifth example of the BB cross-sectional view of FIG. The example shown in FIG. 23 is similar to the example shown in FIG. 10, except for the following points.

The thickness between the first surface 102 and the second surface 104 of the substrate 100 is twice the thickness T in the example shown in FIG.

The first portion 400 has a triangular shape protruding from the second surface 104 of the substrate 100 . This triangle in FIG. 23 is an isosceles triangle with a base (length: W) shared with the second surface 104 of the substrate 100 . It constitutes one side of this isosceles triangle and is inclined by 45° from the direction opposite to the first side S1 along the direction X toward the first side S1. In the direction X, the center of the first portion 400 is shifted from the center of the side wall 310 to the side opposite to the first side S1 by a distance Δ (Δ≧0).

FIG. 24 is a diagram showing a graph of a fifth simulation result of the luminance of the sidewall 310 viewed from the first surface 102 side of the substrate 100. As shown in FIG.

The example in FIG. 24 shows the case where the distance Δ is 0 and W/2 in FIG. The comparative example in FIG. 24 is similar to the example shown in FIG. 23 except that the first portion 400 is not provided.

In the comparative example, luminance peaks appear at both ends of the sidewall 310 . The right peak in the graph of FIG. 24 is the peak at the position corresponding to the end of the first side S1 of the side wall 310 . On the other hand, in the embodiment, when the distance Δ is 0 and W/2, the luminance peak at the end of the first side S1 of the side wall 310 is suppressed. Therefore, in the embodiment, it can be said that the luminance peak can be suppressed regardless of the thicknesses of the first surface 102 and the second surface 104 of the substrate 100 .

FIG. 25 is a sixth example of the BB cross-sectional view of FIG. The example shown in FIG. 25 is similar to the example shown in FIG. 10, except for the following points.

The height of sidewall 310 is twice the height H in the example shown in FIG.

The first portion 400 has a triangular shape protruding from the second surface 104 of the substrate 100 . This triangle in FIG. 25 is an isosceles triangle with a base (length: W) shared with the second surface 104 of the substrate 100 . It constitutes one side of this isosceles triangle and is inclined by 45° from the direction opposite to the first side S1 along the direction X toward the first side S1. In the direction X, the center of the first portion 400 is shifted from the center of the side wall 310 to the side opposite to the first side S1 by a distance Δ (Δ≧0).

FIG. 26 is a diagram showing a graph of a sixth simulation result of the brightness of the sidewall 310 viewed from the first surface 102 side of the substrate 100. As shown in FIG.

The example in FIG. 26 shows the case where the distance Δ is 0 and W/2 in FIG. 25 . The comparative example in FIG. 26 is similar to the example shown in FIG. 25 except that the first portion 400 is not provided.

In the comparative example, luminance peaks appear at both ends of the sidewall 310 . The right peak in the graph of FIG. 26 is the peak at the position corresponding to the end of the first side S1 of the side wall 310 . On the other hand, in the embodiment, when the distance Δ is 0 and W/2, the luminance peak at the end of the first side S1 of the side wall 310 is suppressed. Therefore, it can be said that the embodiment can suppress the peak of luminance regardless of the height of the side wall 310 .

FIG. 27 is a seventh example of the BB cross-sectional view of FIG. The example shown in FIG. 27 is similar to the example shown in FIG. 10, except for the following points.

The first portion 400 has a shape recessed from the second surface 104 of the substrate 100 . The recess of the first portion 400 has a depth D. The recess of the first portion 400 has an isosceles triangular shape with the base lying in the same plane as the second surface 104 of the substrate 100 . Thus, the first portion 400 has a surface (surface 402) inclined along the direction X from the direction opposite to the first side S1 toward the first side S1. In the example shown in FIG. 27, plane 402 is tilted 45° from direction X. In the example shown in FIG.

FIG. 28 is a diagram showing a graph of a seventh simulation result of the luminance of the sidewall 310 viewed from the first surface 102 side of the substrate 100. As shown in FIG.

The example in FIG. 28 shows the case where the depth D in FIG. 27 is T and T/2. The comparative example in FIG. 28 is similar to the example shown in FIG. 27 except that the first portion 400 is not provided.

In the comparative example, luminance peaks appear at both ends of the sidewall 310 . The right peak in the graph of FIG. 28 is the peak at the position corresponding to the end of the first side S1 of the side wall 310 . On the other hand, in the embodiment, regardless of the value of the depth D, the luminance peak at the end of the first side S1 of the side wall 310 is suppressed. Therefore, it can be said that the recess of the first portion 400 can suppress the luminance peak. Furthermore, when the depth D is T, the peak can be suppressed better than when the depth D is T/2. Therefore, in one example, it is desirable that the depth of the depression of the first portion 400 is 50% or more of the thickness T of the first surface 102 and the second surface 104 of the substrate 100 .

29 is a diagram showing a modification of FIG. 2. FIG.

The light emitting device 10 shown in FIG. 29 is applicable to top emission. In other words, in the example shown in FIG. 29, light emitted from the organic layer 120 (for example, FIG. 1) passes through the second electrode 130 (for example, FIG. 1) and the sealing member 300, and is sealed. It is emitted from the member 300 . In the example shown in FIG. 29, the first electrode 110 (eg, FIG. 1) includes a light blocking conductive material and the second electrode 130 (eg, FIG. 1) includes a transparent conductive material. In the example shown in FIG. 29, the area between the substrate 100 and the sealing member 300 is filled with a material 330 . Material 330 is liquid or solid.

In the example shown in FIG. 29, the outer surface of the sealing member 300 is in contact with a region (eg, air) having a refractive index lower than that of the sealing member 300 .

The first portion 400 is located on the first surface 102 side of the substrate 100, and is attached to the side wall 310 of the sealing member 300 in the example shown in FIG. The first portion 400 is positioned closer to the first side S1 than the end portion of the light emitting portion 142 (eg, FIG. 1) in the X direction. First portion 400 has a surface 402 . The surface 402 of the first portion 400 is inclined along the direction X from the direction opposite to the first side S1 toward the first side S1.

FIG. 30 is a diagram for explaining an example of the operation of the light emitting device 10 shown in FIG. 29. FIG. FIG. 31 is a diagram for explaining an example of the operation of the light emitting device 10 according to the comparative example.

30 and 31, light emitted from light emitting portion 142 (eg, FIG. 1) may propagate through material 330 and sealing member 300 by total internal reflection, as indicated by black arrows. In the comparative example (FIG. 31), this light propagates to the edge of sidewall 310 of sealing member 300 . Therefore, the amount of light leaking from the side wall 310 of the sealing member 300 cannot be greatly suppressed. On the other hand, in the example shown in FIG. 30, this light enters the surface 402 of the first portion 400 at a small angle of incidence and is easily transmitted through the surface 402 . Therefore, the amount of light that propagates to the end of the side wall 310 of the sealing member 300 can be suppressed, and the amount of light that leaks from the side wall 310 of the sealing member 300 can be suppressed.

Although the embodiments and examples have been described above with reference to the drawings, these are examples of the present invention, and various configurations other than those described above can be adopted.

10 Light emitting device 20 Sensor device 30 Optical device 100 Substrate 102 First surface 104 Second surface 106a First side 106b Second side 106c Third side 106d Fourth side 110 First electrode 120 Organic layer 130 Second electrode 140 Light emitting region 142 Light-emitting portion 144 Light-transmitting portion 210 Light-emitting element 220 Light-receiving element 300 Sealing member 310 Side wall 320 Lid 330 Material 400 First portion 402 Surface

Claims (1)

a substrate having a first side and a second side opposite the first side;
a light-emitting portion positioned on the first surface side of the substrate and including a first electrode, an organic layer and a second electrode;
a translucent sealing member having a side wall positioned closer to the edge of the substrate than the light emitting portion in one direction along the first surface or the second surface;
a first portion located on the second surface side of the substrate and located closer to the end portion side of the substrate than the light emitting portion in the one direction;
a light receiving element;
including
The optical device, wherein the first portion has a surface inclined with respect to the one direction.

Images