JP2018055817A - Light-emitting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a color difference from standing out from a first translucent region to a second translucent region in a case where a third translucent region includes a region between the first translucent region and the second translucent region in a translucent OLED.SOLUTION: In a case where a visible light (a light of which the wavelength is 380 nm or more and 780 nm or less) is transmitted through a first translucent region TR1, a second translucent region TR2 and a third translucent region TR3, more specifically, in a case where a light from a D65 light source is transmitted through the first translucent region TR1, the second translucent region TR2 and the third translucent region TR3, in a CIELAB, both a color difference between the first translucent region TR1 and the third translucent region TR3 and a color difference between the second translucent region TR2 and the third translucent region TR3 are smaller than a color difference between the first translucent region TR1 and the second translucent region TR2. Thus, the color difference from the first translucent region TR1 to the second translucent region TR2 can be suppressed from standing out.SELECTED DRAWING: Figure 11

Description

  The present invention relates to a light emitting device.

  In recent years, an organic light emitting diode (OLED) having translucency has been developed. For example, Patent Document 1 describes a translucent OLED that displays segments (specifically, seven segments). The OLED includes a first electrode, an organic layer, and a plurality of second electrodes. The first electrode is a transparent electrode and has substantially the same shape as the segment. The organic layer covers the first electrode. The plurality of second electrodes are arranged on the organic layer so as to overlap the first electrode. Thereby, light can be transmitted between two second electrodes adjacent to each other. Thus, this OLED has translucency.

JP 2006-100126 A

  The present inventor has studied a novel structure of a translucent OLED. This OLED includes a conductive layer, and the conductive layer extends over a plurality of light-transmitting regions. Such a plurality of light transmissive regions may include three light transmissive regions, that is, a first light transmissive region, a second light transmissive region, and a third light transmissive region. When the third light-transmitting region includes a region between the first light-transmitting region and the second light-transmitting region, the inventor makes the color difference from the first light-transmitting region to the second light-transmitting region inconspicuous. Considered to do.

  As a problem to be solved by the present invention, in the translucent OLED, when the third translucent region includes a region between the first translucent region and the second translucent region, the first translucent region to the second translucent OLED. An example is to make the color difference inconspicuous over the light-transmitting region.

The invention described in claim 1
A first light transmissive region, a second light transmissive region, a third light transmissive region,
A first conductive layer extending across the first, second and third light transmissive regions;
With
The third light transmissive region includes a region between the first light transmissive region and the second light transmissive region,
When visible light is transmitted through the first, second, and third light-transmitting regions, the color difference between the first light-transmitting region and the third light-transmitting region and the second light-transmitting region and the third light-transmitting region in CIELAB. Each of the light regions has a color difference smaller than the color difference between the first light-transmitting region and the second light-transmitting region.

It is a top view which shows the light-emitting device which concerns on embodiment. It is the figure which removed the conductive layer from FIG. It is sectional drawing which shows the light emission part shown in FIG. It is sectional drawing which shows the 1st light transmission part shown in FIG. It is sectional drawing which shows the 2nd light transmission part shown in FIG. It is sectional drawing which shows the 3rd light transmission part shown in FIG. It is sectional drawing which shows the 4th light transmission part shown in FIG. It is a figure which shows an example of the cross section of the light-emitting device shown in FIG.1 and FIG.2. It is sectional drawing which shows the 1st example of each detail of a light emission part, a 1st light transmission part, and a 2nd light transmission part. It is sectional drawing which shows the 2nd example of each detail of a light emission part, a 1st light transmission part, and a 2nd light transmission part. It is a top view which shows the light-emitting device based on an Example.

  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 plan view showing a light emitting device 10 according to the embodiment. FIG. 2 is a view in which the conductive layer 130 is removed from FIG. FIG. 3 is a cross-sectional view showing the light emitting unit 160 shown in FIG. FIG. 4 is a cross-sectional view showing the first light transmitting portion 162 shown in FIG. FIG. 5 is a cross-sectional view showing the second light transmitting portion 164 shown in FIG. FIG. 6 is a cross-sectional view showing the third light transmitting portion 166 shown in FIG. FIG. 7 is a cross-sectional view showing the fourth light transmitting portion 168 shown in FIG. The light emitting device 10 includes a substrate 100, a plurality of conductive layers 110, an organic layer 120, a conductive layer 130, an insulating layer 140, a cap layer 150, and a plurality of light emitting portions 160. For the sake of explanation, the cap layer 150 is not shown in FIGS.

  The substrate 100 has translucency. In one example, the substrate 100 is a glass substrate. In the example shown in FIGS. 1 to 7, the substrate 100 has a first surface 102 and a second surface 104. The plurality of conductive layers 110, the organic layer 120, the conductive layer 130, the insulating layer 140, and the cap layer 150 are on the first surface 102. The second surface 104 is on the opposite side of the first surface 102.

  The conductive layer 110 has a light-transmitting property. In other words, the conductive layer 110 is a transparent conductive layer. In one example, the conductive layer 110 includes ITO (Indium Tin Oxide).

  The organic layer 120 has a light-transmitting property and includes a plurality of light-emitting layers (EML) 122 (a light-emitting layer (EML) 122a and a light-emitting layer (EML) 122b). Each of the EML 122a and the EML 122b includes an organic compound that emits light by electroluminescence. The wavelength of light emitted from the EML 122a is different from the wavelength of light emitted from the EML 122b. Specifically, the EML 122a emits red light (light having a wavelength of approximately 600 nm to 750 nm), and the EML 122b emits green light (light having a wavelength of approximately 500 nm to 570 nm).

  The conductive layer 130 has a light-transmitting property. In other words, the conductive layer 130 is a transparent conductive layer. In one example, the conductive layer 130 includes a MgAg alloy. The thickness of the conductive layer 130 is considerably thin, for example, 15 nm or less. For this reason, the conductive layer 130 has translucency. In one example, the transmittance of the conductive layer 130 for visible light (light with a wavelength of 380 nm to 780 nm) is 65% or more, preferably 80% or more.

The insulating layer 140 has translucency. In one example, the insulating layer 140 is an inorganic insulating layer, and specifically includes silicon oxide (SiO ₂ ). In another example, the insulating layer 140 may be an organic insulating layer, and specifically may include polyimide.

  The insulating layer 140 has a plurality of openings 142. The region exposed from the opening 142 of the insulating layer 140 functions as the light emitting unit 160. In other words, the insulating layer 140 defines a plurality of light emitting units 160.

  The cap layer 150 has translucency. In one example, the cap layer 150 is an insulating layer. The cap layer 150 covers the conductive layer 130. In this way, the cap layer 150 relaxes the refractive index step between the conductive layer 130 and the air layer and improves the transmittance.

  Each of the plurality of light emitting units 160 emits light by a voltage between the conductive layer 110 and the conductive layer 130. Specifically, the conductive layer 110 has a region functioning as an anode (first electrode 112) in a region overlapping with the opening 142 of the insulating layer 140. The conductive layer 130 has a region functioning as a cathode (second electrode 132) in a region overlapping with the opening 142 of the insulating layer 140. The first light emitting unit 160a among the plurality of light emitting units 160 emits light from the EML 122a. Among the plurality of light emitting units 160, the second light emitting unit 160b emits light from the EML 122b.

  In the example shown in FIGS. 1 and 2, the light emitting device 10 includes three conductive layers 110. Of the three conductive layers 110, the central conductive layer 110 is electrically insulated from the conductive layer 130 by the insulating layer 140. In other words, the conductive layer 110 does not function as an anode but functions as a dummy conductive layer.

  In the example shown in FIGS. 1-7, the light-emitting device 10 is bottom emission. That is, the light from the EML 122 is emitted from the second surface 104 of the substrate 100 to the outside.

  The light emitting device 10 has translucency. More specifically, the substrate 100, the plurality of conductive layers 110, the organic layer 120, the conductive layer 130, the insulating layer 140, and the cap layer 150 are all translucent. Therefore, an object on the first surface 102 side of the substrate 100 can be seen through from the second surface 104 side of the substrate 100. Similarly, an object on the second surface 104 side of the substrate 100 can be seen through from the first surface 102 side of the substrate 100.

  As shown in FIG. 3, the light emitting unit 160 includes a stack of a substrate 100, a conductive layer 110, an organic layer 120, a conductive layer 130, and a cap layer 150. In other words, the light emitting unit 160 does not include the insulating layer 140 (FIGS. 4 to 7). In the light emitting unit 160, the organic layer 120 includes an EML 122 (EML 122a in the example illustrated in FIG. 3).

  As shown in FIG. 4, the first light transmitting part 162 includes a stack of the substrate 100, the conductive layer 110, the insulating layer 140, the organic layer 120, the conductive layer 130, and the cap layer 150. In the first light transmitting portion 162, the organic layer 120 includes the EML 122 (EML 122a in the example shown in FIG. 4).

  As shown in FIG. 5, the second light transmitting portion 164 includes a stack of the substrate 100, the insulating layer 140, the organic layer 120, the conductive layer 130, and the cap layer 150. In other words, the second light transmitting portion 164 does not have the conductive layer 110 (FIGS. 3, 4, 6, and 7). In the first light transmitting portion 162, the organic layer 120 includes an EML 122 (EML 122a in the example shown in FIG. 5). In particular, in the example illustrated in FIGS. 1 and 2, the second light transmitting portion 164 is located between two conductive layers 110 adjacent to each other.

  As shown in FIG. 6, the third light transmitting portion 166 includes a stack of the substrate 100, the conductive layer 110, the insulating layer 140, the organic layer 120, the conductive layer 130, and the cap layer 150. In the third light transmitting portion 166, the organic layer 120 includes a plurality of EMLs 122 (EML 122a and EML 122b in the example shown in FIG. 6) that overlap each other.

  As shown in FIG. 7, the fourth light transmitting portion 168 includes a stack of the substrate 100, the conductive layer 110, the insulating layer 140, the organic layer 120, the conductive layer 130, and the cap layer 150. In the fourth light transmitting portion 168, the organic layer 120 does not include the EML 122.

  As shown in FIGS. 3 to 7, the light emitting unit 160, the first light transmitting unit 162, the second light transmitting unit 164, the third light transmitting unit 166, and the fourth light transmitting unit 168 have a common organic layer (organic layer). 120), a common first conductive layer (conductive layer 130) and a common cap layer (cap layer 150). In other words, the organic layer 120, the conductive layer 130, and the cap layer 150 extend over the light emitting unit 160, the first light transmitting unit 162, the second light transmitting unit 164, the third light transmitting unit 166, and the fourth light transmitting unit 168. It has spread. In particular, as shown in FIGS. 3 to 5, the light emitting unit 160, the first light transmitting unit 162, the second light transmitting unit 164, and the third light transmitting unit 166 have a common light emitting layer (EML 122 a). . In other words, the EML 122a extends over the light emitting unit 160, the first light transmitting unit 162, the second light transmitting unit 164, and the third light transmitting unit 166. Furthermore, in the example shown in FIGS. 1 and 2, the first light emitting unit 160a and the second light emitting unit 160b have a common first conductive layer (conductive layer 130). In other words, the conductive layer 130 extends over the first light emitting unit 160a and the second light emitting unit 160b.

  As shown in FIGS. 4 to 7, the first light transmitting portion 162, the second light transmitting portion 164, the third light transmitting portion 166, and the fourth light transmitting portion 168 have a common insulating layer (insulating layer 140). doing. In other words, the insulating layer 140 extends over the first light transmitting portion 162, the second light transmitting portion 164, the third light transmitting portion 166, and the fourth light transmitting portion 168.

  FIG. 8 is a diagram illustrating an example of a cross section of the light emitting device 10 illustrated in FIGS. 1 and 2. In addition, in this figure, the cap layer 150 (FIGS. 3-7) is not shown for description. In the example shown in the drawing, the light emitting device 10 has three types of regions, that is, a light emitting unit 160, a first light transmitting unit 162, and a second light transmitting unit 164. As described with reference to FIG. 3, the light emitting unit 160 includes a stack of the substrate 100, the conductive layer 110, the organic layer 120, and the conductive layer 130. As described with reference to FIG. 4, the first light transmitting portion 162 includes a stack of the substrate 100, the conductive layer 110, the insulating layer 140, the organic layer 120, and the conductive layer 130. As described with reference to FIG. 5, the second light transmitting portion 164 includes a stack of the substrate 100, the insulating layer 140, the organic layer 120, and the conductive layer 130.

  The light emitting device 10 includes two conductive layers 110. The two conductive layers 110 are separated from each other. One of the two conductive layers 110 (second conductive layer: in the example shown in the drawing, the conductive layer 110 having a region functioning as the first electrode 112) is the organic layer 120 and the conductive layer 130 in the light-emitting portion 160. overlapping. The other of the two conductive layers 110 (third conductive layer: dummy conductive layer 114 in the example shown in the figure) overlaps with the insulating layer 140, the organic layer 120, and the conductive layer 130 in the first light transmitting portion 162. Yes.

  The organic layer 120 extends over the light emitting unit 160, the first light transmitting unit 162, and the second light transmitting unit 164. In particular, in the example illustrated in this drawing, the organic layer 120 extends over the two conductive layers 110 that are separated from each other. Yes. Thereby, the color difference among the light emission part 160, the 1st light transmission part 162, and the 2nd light transmission part 164 can be suppressed.

  Specifically, when visible light from outside (light having a wavelength of 380 nm to 780 nm) passes through the light emitting device 10, the visible light may have different colors before and after transmission through the light emitting device 10. Such a phenomenon may occur when, in one example, interference of light of a specific wavelength is generated by the organic layer 120 (in other words, when a microcavity is formed by the organic layer 120), or in another example, the organic layer Occurs when 120 absorbs light of a particular wavelength. In the example shown in the figure, the organic layer 120 extends over the light emitting unit 160, the first light transmitting unit 162, and the second light transmitting unit 164. For this reason, even if the color of visible light changes in this way, the color difference among the light emission part 160, the 1st light transmission part 162, and the 2nd light transmission part 164 can be suppressed.

  Furthermore, the thickness of the organic layer 120 is substantially constant over the light emitting unit 160, the first light transmitting unit 162, and the second light transmitting unit 164. In other words, the thickness of the organic layer 120 in the light emitting part 160 is substantially equal to each of the thickness of the organic layer 120 in the first light transmitting part 162 and the thickness of the organic layer 120 in the second light transmitting part 164, Specifically, the thickness of the organic layer 120 in the first light transmitting portion 162 is, for example, 95% or more and 105% or less, and the thickness of the organic layer 120 in the second light transmitting portion 164 is, for example, 95% or more and 105% or less. . Thereby, the color difference among the light emission part 160, the 1st light transmission part 162, and the 2nd light transmission part 164 can further be suppressed.

  More specifically, interference that enhances light of a specific wavelength may occur between the upper surface and the lower surface of the organic layer 120. In the example shown in this figure, even if such interference occurs, the thickness of the organic layer 120 is substantially the same across the light emitting unit 160, the first light transmitting unit 162, and the second light transmitting unit 164. It is constant. Therefore, the wavelength causing interference in the organic layer 120 of the light emitting unit 160, the wavelength causing interference in the organic layer 120 of the first light transmitting unit 162, and the wavelength causing interference in the organic layer 120 of the second light transmitting unit 164 are mutually different. Almost equal. Thereby, the color difference among the light emission part 160, the 1st light transmission part 162, and the 2nd light transmission part 164 can further be suppressed.

  The insulating layer 140 defines the light emitting part 160 and extends over the first light transmitting part 162 and the second light transmitting part 164. In particular, in the example shown in this figure, the insulating layer 140 extends over the two conductive layers 110 spaced apart from each other. Spreading. Thereby, the color difference between the 1st translucent part 162 and the 2nd translucent part 164 can be suppressed.

  Specifically, when visible light from outside (light having a wavelength of 380 nm to 780 nm) passes through the light emitting device 10, the visible light may have different colors before and after transmission through the light emitting device 10. Such a phenomenon may occur when, for example, interference that intensifies light of a specific wavelength is generated by the insulating layer 140 (in other words, when a microcavity is formed by the insulating layer 140), or in another example, the insulating layer This occurs when 140 absorbs light of a specific wavelength. In the example shown in this drawing, the insulating layer 140 extends over the first light transmitting portion 162 and the second light transmitting portion 164. For this reason, even if the color of visible light changes in this way, the color difference between the 1st translucent part 162 and the 2nd translucent part 164 can be suppressed.

  Furthermore, the thickness of the insulating layer 140 is substantially constant over the first light transmitting part 162 and the second light transmitting part 164. In other words, the thickness of the insulating layer 140 in the second light transmitting part 164 is substantially equal to the thickness of the insulating layer 140 in the first light transmitting part 162, specifically, the insulating layer in the first light transmitting part 162. For example, the thickness of 140 is 95% or more and 105% or less. Thereby, the color difference between the 1st translucent part 162 and the 2nd translucent part 164 can further be suppressed.

  In detail, interference that strengthens light of a specific wavelength may occur between the upper surface and the lower surface of the insulating layer 140. In the example shown in this figure, even if such interference occurs, the thickness of the insulating layer 140 is substantially constant over the first light transmitting portion 162 and the second light transmitting portion 164. For this reason, the wavelength at which interference occurs in the insulating layer 140 of the first light transmitting part 162 and the wavelength at which interference occurs in the insulating layer 140 of the second light transmitting part 164 are substantially equal to each other. Thereby, the color difference between the 1st translucent part 162 and the 2nd translucent part 164 can further be suppressed.

  FIG. 9 is a cross-sectional view illustrating a first example of the details of each of the light emitting unit 160, the first light transmitting unit 162, and the second light transmitting unit 164. In the example shown in the figure, the organic layer 120 includes a hole injection layer (HIL) 120a, a hole transport layer (HTL) 120b, a light emitting layer (EML) 120c (EML 122 shown in FIGS. 1 to 7), and electron transport. The layer (ETL) 120d is included. In addition, the layer contained in the organic layer 120 is not limited to the example shown in this figure. In one example, the organic layer 120 may further include an electron injection layer (EIL) between the ETL 120d and the conductive layer 130.

  In the example shown in the figure, the thickness of the organic layer 120 is considerably thick, for example, 500 nm or more, and preferably, for example, 1000 nm or more. More specifically, in the example shown in the figure, the HIL 120a (that is, the layer in contact with the conductive layer 110 and the insulating layer 140 (first layer)) in the organic layer 120 is considerably thick, for example, 100 nm or more. Preferably, it is 200 nm or more, for example. When the thickness of the organic layer 120 is so thick, constructive interference due to visible light (light having a wavelength of 380 nm to 780 nm) occurs between the upper surface and the lower surface of the organic layer 120, that is, a microcavity may be generated. Is prevented. For this reason, the color difference among the light emission part 160, the 1st light transmission part 162, and the 2nd light transmission part 164 is small.

Specifically, a condition for causing constructive interference by visible light between the upper surface and the lower surface of the organic layer 120 is as shown in the following formula (1).
2L = mλ (1)
However, L is the optical path length between the upper surface and lower surface of the organic layer 120, m is an integer greater than or equal to 1, and (lambda) is the wavelength of visible light. When the thickness of the organic layer 120 is thick, the optical path length L of the formula (1) is large. In this case, in order to satisfy Expression (1), the integer m needs to be large. On the other hand, such higher-order interference can hardly occur in practice. In this way, in the example shown in this figure, constructive interference due to visible light (light having a wavelength of 380 nm or more and 780 nm or less) is generated between the upper surface and the lower surface of the organic layer 120, that is, the formation of a microcavity is prevented. Has been.

  In the example shown in the drawing, the thickness of the HIL 120a is substantially constant over the light emitting unit 160, the first light transmitting unit 162, and the second light transmitting unit 164. In other words, the thickness of the HIL 120a in the light emitting unit 160 is substantially equal to each of the thickness of the HIL 120a in the first light transmitting unit 162 and the thickness of the HIL 120a in the second light transmitting unit 164. The thickness of the HIL 120a in the first light transmitting portion 162 is, for example, 95% or more and 105% or less, and the thickness of the HIL 120a in the second light transmitting portion 164 is, for example, 95% or more and 105% or less. Accordingly, the thickness of the organic layer 120 is substantially constant over the light emitting unit 160, the first light transmitting unit 162, and the second light transmitting unit 164.

  In the example shown in the figure, the HIL 120a includes a conductive polymer material, specifically, for example, PEDOT: PSS. For this reason, even if the thickness of the HIL 120a is large, it is possible to prevent the voltage (that is, the driving voltage) for causing the light emitting unit 160 to emit light from increasing.

  Further, the HIL 120a is formed by a coating process. Specifically, an ink containing a hole injection material is applied. The ink is then heated. Thereby, the HIL 120a is formed.

  FIG. 10 is a cross-sectional view illustrating a second example of the details of each of the light emitting unit 160, the first light transmitting unit 162, and the second light transmitting unit 164. The example shown in this figure is the same as the example shown in FIG. 9 except for the following points.

  In the example shown in this figure, the thickness of the organic layer 120 is considerably thin, for example, 50 nm or less, and preferably, for example, 30 nm or less. When the thickness of the organic layer 120 is so thin, constructive interference due to visible light (light having a wavelength of 380 nm to 780 nm) occurs between the upper surface and the lower surface of the organic layer 120, that is, a microcavity may be generated. Is prevented. For this reason, the color difference among the light emission part 160, the 1st light transmission part 162, and the 2nd light transmission part 164 is small.

  Specifically, a condition for causing constructive interference by visible light between the upper surface and the lower surface of the organic layer 120 is as shown in the above-described formula (1). When the thickness of the organic layer 120 is thin, the optical path length L of the formula (1) is small. In particular, when the thickness of the organic layer 120 is considerably thin, even if it is any integer m, the formula (1) cannot be satisfied. In this way, in the example shown in this figure, constructive interference due to visible light (light having a wavelength of 380 nm or more and 780 nm or less) is generated between the upper surface and the lower surface of the organic layer 120, that is, the formation of a microcavity is prevented. Has been.

  As described above, according to the present embodiment, the organic layer 120 extends over the light emitting unit 160, the first light transmitting unit 162, and the second light transmitting unit 164. Furthermore, the thickness of the organic layer 120 is considerably thicker or considerably thinner. Furthermore, the thickness of the organic layer 120 is substantially constant over the light emitting unit 160, the first light transmitting unit 162, and the second light transmitting unit 164. For this reason, the color difference among the light emission part 160, the 1st light transmission part 162, and the 2nd light transmission part 164 is small.

  Furthermore, according to the present embodiment, the insulating layer 140 extends over the light emitting unit 160, the first light transmitting unit 162, and the second light transmitting unit 164. Furthermore, the thickness of the insulating layer 140 is substantially constant over the light emitting unit 160, the first light transmitting unit 162, and the second light transmitting unit 164. For this reason, the color difference among the light emission part 160, the 1st light transmission part 162, and the 2nd light transmission part 164 is small.

  FIG. 11 is a plan view illustrating the light emitting device 10 according to the example. In the present embodiment, the light emitting device 10 includes a first region R1 and a second region R2. The first region R1 includes a first light transmissive region TR1, a second light transmissive region TR2, and a third light transmissive region TR3. The first light transmitting region TR1 and the second light transmitting region TR2 are inside the third light transmitting region TR3. In the example shown in the drawing, the area of the third light transmitting region TR3 is larger than both the area of the first light transmitting region TR1 and the area of the second light transmitting region TR2. The third light transmissive region TR3 includes a region (region RR) between the first light transmissive region TR1 and the second light transmissive region TR2. The second region R2 is outside the first region R1, and surrounds the first region R1 in the example shown in the drawing. The first region R1 includes a first partial region PR1. Further, the second region R2 may not include the cap layer 150. The first partial region PR1 is in contact with the second region R2, and extends along the outer edge of the first region R1 in the example shown in the drawing.

  The light emitting device 10 includes a first light emitting unit 160a (light emitting unit 160), a second light emitting unit 160b (light emitting unit 160), and a first light transmitting unit 162. The first light emitting unit 160a has a region that functions as the first light transmitting region TR1. In the example shown in the figure, the first light emitting unit 160a displays 7 segments. The second light emitting unit 160b has a region that functions as the second light transmitting region TR2. In the example shown in the figure, the second light emitting unit 160b displays a + (plus) mark. The first light transmitting portion 162 has a region that functions as the third light transmitting region TR3.

  A light emitting unit 160 illustrated in FIG. 11 is the same as the light emitting unit 160 according to the embodiment. Specifically, as described with reference to FIG. 3, the light emitting unit 160 includes a stack of the substrate 100, the conductive layer 110, the organic layer 120, the conductive layer 130, and the cap layer 150. Particularly, the first light emitting unit 160a and the second light emitting unit 160b emit light from the EML 122a and the EML 122b, respectively, as described with reference to FIGS.

  The first light transmitting portion 162 illustrated in FIG. 11 is the same as the first light transmitting portion 162 according to the embodiment. Specifically, as described with reference to FIG. 4, the first light transmitting portion 162 includes a stack of the substrate 100, the conductive layer 110, the insulating layer 140, the organic layer 120, the conductive layer 130, and the cap layer 150. Yes.

  Similarly to the embodiment, the first light emitting unit 160a, the second light emitting unit 160b, and the first light transmitting unit 162 have a common first conductive layer (conductive layer 130) (FIGS. 1 to 7). . In other words, the conductive layer 130 extends over the first light emitting unit 160a, the second light emitting unit 160b, and the first light transmitting unit 162. Alternatively, part of the conductive layer 130 may be separated.

  In the example shown in this figure, when visible light (light having a wavelength of 380 nm to 780 nm) is transmitted through the first light transmitting region TR1, the second light transmitting region TR2, and the third light transmitting region TR3, more specifically, When light from the D65 light source is transmitted through the first light transmitting region TR1, the second light transmitting region TR2, and the third light transmitting region TR3, the color difference between the first light transmitting region TR1 and the third light transmitting region TR3 and the second light transmitting region TR3. The color difference between the light region TR2 and the third light transmission region TR3 is small to some extent, and in CIELAB, both are, for example, 6.5 or less, preferably 3.2 or less. As a result, neither the first light-transmitting region TR1 nor the second light-transmitting region TR2 is noticeable.

  Specifically, in one example, when the color difference between the second light-transmitting region TR2 and the third light-transmitting region TR3 is somewhat large even if the color difference between the first light-transmitting region TR1 and the third light-transmitting region TR3 is substantially zero, The second light transmissive region TR2 becomes conspicuous. In another example, even if the color difference between the second light-transmitting region TR2 and the third light-transmitting region TR3 is substantially zero, if the color difference between the first light-transmitting region TR1 and the third light-transmitting region TR3 is large to some extent, The translucent region TR1 becomes conspicuous. In the example shown in this figure, the color difference between the first light-transmitting region TR1 and the third light-transmitting region TR3 and the color difference between the second light-transmitting region TR2 and the third light-transmitting region TR3 are all small to some extent. For this reason, neither the first light-transmitting region TR1 nor the second light-transmitting region TR2 is noticeable.

  In another example, the first light transmissive region TR1 and the second light transmissive region TR2 may not be inside the third light transmissive region TR3. In this example, the first light transmissive region TR1 and the second light transmissive region TR2 may be located in the vicinity of the third light transmissive region TR3, and more specifically, are in contact with the third light transmissive region TR3. May be. In this case, even if the area of the third light transmitting region TR3 is larger than both the area of the first light transmitting region TR1 and the area of the second light transmitting region TR2, the first light transmitting region TR1 and the third light transmitting region TR3. When the color difference between the second light-transmitting region TR2 and the third light-transmitting region TR3 is small to some extent as described above, neither the first light-transmitting region TR1 nor the second light-transmitting region TR2 is noticeable. Become.

  In the example shown in this figure, when visible light (light having a wavelength of 380 nm to 780 nm) is transmitted through the first light transmitting region TR1, the second light transmitting region TR2, and the third light transmitting region TR3, more specifically, When light from the D65 light source is transmitted through the first light transmitting region TR1, the second light transmitting region TR2, and the third light transmitting region TR3, the color difference between the first light transmitting region TR1 and the third light transmitting region TR3 and the second light transmitting region TR3. The color difference between the light region TR2 and the third light-transmitting region TR3 is large to some extent, and in CIELAB, both are, for example, 0.4 or more. Thereby, the first light transmitting region TR1, the second light transmitting region TR2, and the third light transmitting region TR3 can be identified.

  Specifically, when the color difference between the first light-transmitting region TR1 and the third light-transmitting region TR3 is less than 0.4, human vision can identify the first light-transmitting region TR1 and the third light-transmitting region TR3. Similarly, when the color difference between the second light-transmitting region TR2 and the third light-transmitting region TR3 is less than 0.4, the second light-transmitting region TR2 and the third light-transmitting region TR3 are visually recognized by human vision. It becomes difficult to identify. When it is difficult to distinguish the first light-transmitting region TR1, the second light-transmitting region TR2, and the third light-transmitting region TR3, the first light-transmitting region TR1, the second light-transmitting region TR2, and the third light-transmitting region TR3. It becomes difficult to inspect the region TR3. In the example shown in this figure, the color difference between the first light-transmitting region TR1 and the third light-transmitting region TR3 and the color difference between the second light-transmitting region TR2 and the third light-transmitting region TR3 are large to some extent. Therefore, it is possible to identify the first light-transmitting region TR1, the second light-transmitting region TR2, and the third light-transmitting region TR3. For this reason, it becomes easy to inspect the first light-transmitting region TR1, the second light-transmitting region TR2, and the third light-transmitting region TR3.

  In the example shown in this figure, when visible light (light having a wavelength of 380 nm to 780 nm) is transmitted through the first light transmitting region TR1, the second light transmitting region TR2, and the third light transmitting region TR3, more specifically, When light from the D65 light source is transmitted through the first light-transmitting region TR1, the second light-transmitting region TR2, and the third light-transmitting region TR3, in CIELAB, the color difference between the first light-transmitting region TR1 and the third light-transmitting region TR3 and The color difference between the second light-transmitting region TR2 and the third light-transmitting region TR3 is smaller than the color difference between the first light-transmitting region TR1 and the second light-transmitting region TR2, in other words, the first light-transmitting region TR1 and the region. The color difference between RR and the color difference between the second light-transmitting region TR2 and the region RR are both smaller than the color difference between the first light-transmitting region TR1 and the second light-transmitting region TR2. Thereby, it can suppress that the color difference from 1st translucent area | region TR1 to 2nd translucent area | region TR2 is conspicuous.

  Specifically, the color difference between the first light-transmitting region TR1 and the second light-transmitting region TR2 indicates that the first light-transmitting region TR1 and the second light-transmitting region TR2 are in contact with each other when the first light-transmitting region TR1 and the second light-transmitting region TR2 are in contact with each other. It becomes more conspicuous for human perception than when the two light-transmitting regions TR2 are separated from each other. In the example shown in this drawing, the region RR is located between the first light transmitting region TR1 and the second light transmitting region TR2. Therefore, even if the color difference between the first light-transmitting region TR1 and the second light-transmitting region TR2 is large, the color difference from the first light-transmitting region TR1 to the second light-transmitting region TR2 is suppressed from being noticeable. be able to.

  When visible light (light having a wavelength of 380 nm to 780 nm) is transmitted through the first light-transmitting region TR1 and the second light-transmitting region TR2, more specifically, the first light-transmitting region TR1 and the second light-transmitting region. When light from the D65 light source is transmitted through TR2, the color difference between the first light-transmitting region TR1 and the second light-transmitting region TR2 is, for example, 0.4 or more and 6.5 or less in CIELAB.

  In the example shown in the figure, when visible light (light having a wavelength of 380 nm to 780 nm) is transmitted through the first partial region PR1 and the second region R2, more specifically, the first partial region PR1 and the second region R2 When the light from the D65 light source is transmitted, the color difference between the first partial region PR1 and the second region R2 is somewhat small, and is, for example, 6.5 or less, preferably 3.2 or less in CIELAB. Thereby, it can suppress that 1st area | region R1 and 2nd area | region R2 stand out mutually.

  Specifically, when the color difference between the first partial region PR1 and the second region R2 is large to some extent, the first region R1 and the second region R2 become conspicuous. In the example shown in this figure, the color difference between the first partial region PR1 and the second region R2 is somewhat small. For this reason, it can suppress that 1st area | region R1 and 2nd area | region R2 stand out mutually.

  In the example shown in the figure, when visible light (light having a wavelength of 380 nm to 780 nm) is transmitted through the first partial region PR1 and the second region R2, more specifically, the first partial region PR1 and the second region R2 When the light from the D65 light source is transmitted, the color difference between the first partial region PR1 and the second region R2 is large to some extent, and is, for example, 0.4 or more in CIELAB. Thereby, the first region R1 and the second region R2 can be identified.

  Specifically, when the color difference between the first partial region PR1 and the second region R2 is less than 0.4, it is difficult for human vision to identify the first partial region PR1 and the second light-transmissive region TR2. When it is difficult to distinguish between the first partial region PR1 and the second region R2, it is difficult to inspect the first region R1 and the second region R2. In the example shown in this figure, the color difference between the first partial region PR1 and the second region R2 is large to some extent. For this reason, the first region R1 and the second region R2 can be identified. For this reason, the inspection of the first partial region PR1 and the second region R2 becomes easy.

  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 100 Board | substrate 102 1st surface 104 2nd surface 110 Conductive layer 112 1st electrode 114 Dummy conductive layer 120 Organic layer 120a HIL
120b HTL
120c EML
120d ETL
122 EML
122a EML
122b EML
130 conductive layer 132 second electrode 140 insulating layer 142 opening 150 cap layer 160 light emitting part 160a first light emitting part 160b second light emitting part 162 first light transmitting part 164 second light transmitting part 166 third light transmitting part 168 fourth light transmitting part Optical part PR1 First partial region R1 First region R2 Second region RR region TR1 First light transmitting region TR2 Second light transmitting region TR3 Third light transmitting region

Claims (3)

A first light transmissive region, a second light transmissive region, a third light transmissive region,
A first conductive layer extending across the first, second and third light transmissive regions;
With
The third light transmissive region includes a region between the first light transmissive region and the second light transmissive region,
When visible light is transmitted through the first, second, and third light-transmitting regions, the color difference between the first light-transmitting region and the third light-transmitting region and the second light-transmitting region and the third light-transmitting region in CIELAB. The light emitting device is such that the color difference between the light regions is smaller than the color difference between the first light transmitting region and the second light transmitting region. The light-emitting device according to claim 1.
The first and second light transmissive regions are light emitting devices located inside the third light transmissive region. The light-emitting device according to claim 1 or 2,
A first light emitting unit, a second light emitting unit, a first light transmitting unit,
An insulating layer that defines the first light emitting part and the second light emitting part and extends over the first light transmitting part;
With
The first light emitting unit has a region functioning as the first light transmitting region,
The second light emitting unit has a region functioning as the second light transmitting region,
The first light transmitting unit is a light emitting device having a region functioning as the third light transmitting region.

Images