US20230375763A1 - Light-emitting device - Google Patents
Light-emitting device Download PDFInfo
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- US20230375763A1 US20230375763A1 US18/226,035 US202318226035A US2023375763A1 US 20230375763 A1 US20230375763 A1 US 20230375763A1 US 202318226035 A US202318226035 A US 202318226035A US 2023375763 A1 US2023375763 A1 US 2023375763A1
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Images
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/22—Absorbing filters
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/22—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/26—Light sources with substantially two-dimensional radiating surfaces characterised by the composition or arrangement of the conductive material used as an electrode
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/86—Arrangements for improving contrast, e.g. preventing reflection of ambient light
- H10K50/865—Arrangements for improving contrast, e.g. preventing reflection of ambient light comprising light absorbing layers, e.g. light-blocking layers
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light
- H10K59/8792—Arrangements for improving contrast, e.g. preventing reflection of ambient light comprising light absorbing layers, e.g. black layers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/52—Encapsulations
- H01L33/54—Encapsulations having a particular shape
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
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Definitions
- the present invention relates to a light-emitting device.
- Such a light-emitting device is used as an illumination device or a display device and has a configuration in which an organic layer is interposed between a first electrode and a second electrode.
- a transparent material is used for the first electrode
- a metal material is used for the second electrode.
- Patent Document 1 One of the light-emitting devices using an organic EL is a technology described in Patent Document 1.
- the second electrode is provided only in a portion of a pixel in order to cause a display device using an organic EL to have optical transparency (see-through property).
- the display device can have optical transparency.
- a light-transmitting insulating film is formed between the plurality of second electrodes in order to define a pixel.
- an example of a material of this insulating film includes an inorganic material such as a silicon oxide, or a resin material such as an acrylic resin.
- Patent Document 1 Japanese Unexamined Patent Publication No. 2011-23336
- the amount and color of light transmitted through the light-emitting device may be desired to be restricted. Even in such a case, it is often the case that the amount and color of light which is radiated from a light-emitting unit of the light-emitting device is not desired to be restricted.
- An exemplary problem to be solved by the present invention is to restrict the amount and color of light which is transmitted through a light-emitting device having optical transparency and to prevent the amount and color of light which is radiated from a light-emitting unit from being restricted.
- a light-emitting device including: a light-transmitting substrate; a plurality of light-emitting units, provided on a first surface of the substrate away from each other, each light-emitting unit including a light-transmitting first electrode, a light-reflective second electrode, and an organic layer located between the first electrode and the second electrode; a light-transmitting region which is located between the light-emitting units, and through which light is transmitted in a thickness direction; and an optical filter that overlaps the light-transmitting region, and does not overlap the plurality of light-emitting units or overlaps a surface of the plurality of light-emitting units on an opposite side to a light emission surface.
- FIG. 1 is a cross-sectional view illustrating a configuration of a light-emitting device according to an embodiment.
- FIG. 2 is a plan view of the light-emitting device.
- FIG. 3 is a cross-sectional view illustrating a configuration of a light-emitting device according to Modification Example 1.
- FIG. 4 is a cross-sectional view illustrating a configuration of a light-emitting device according to Modification Example 2.
- FIG. 5 is a cross-sectional view illustrating a configuration of a light-emitting device according to Modification Example 3.
- FIG. 6 is a cross-sectional view illustrating a configuration of a light-emitting device according to Modification Example 4.
- FIG. 7 is a cross-sectional view of a light-emitting device according to Modification Example 5.
- FIG. 8 is a plan view of a light-transmitting member shown in FIG. 7 .
- FIG. 9 is a plan view of a light-transmitting member according to Modification Example 6.
- FIG. 1 is a cross-sectional view illustrating a configuration of a light-emitting device 10 according to an embodiment.
- FIG. 2 is a plan view of the light-emitting device 10 .
- FIG. 1 corresponds to a cross-section A-A of FIG. 2 .
- the light-emitting device 10 according to the embodiment includes a light-transmitting substrate 100 , a plurality of light-emitting units 140 , a light-transmitting region (second region 104 and third region 106 ), and an optical filter 200 .
- the plurality of light-emitting units 140 are provided on a first surface 100 a of the substrate 100 and are separated from each other.
- the light-emitting unit 140 includes a light-transmitting first electrode 110 , an organic layer 120 , and a light-reflective second electrode 130 .
- the organic layer 120 is located between the first electrode 110 and the second electrode 130 .
- the light-transmitting region is located between the light-emitting units 140 and transmits light in the thickness direction of the light-emitting device 10 .
- the optical filter 200 overlaps the light-transmitting region and does not overlap the plurality of light-emitting units 140 . Meanwhile, the optical filter 200 may overlap the end of the light-emitting unit 140 . However, as shown in a modification example described later, the optical filter 200 may cover the surface of the light-emitting unit 140 on the opposite side to a light emission surface. In other words, the optical filter 200 is not located on the light emission side of the light-emitting unit 140 .
- a detailed description will be given.
- the substrate 100 is, for example, a glass substrate or a resin substrate which has optical transparency.
- the substrate 100 may have flexibility.
- the thickness of the substrate 100 is, for example, equal to or greater than 10 ⁇ m and equal to or less than 1,000 ⁇ m.
- the substrate 100 is polygonal such as, for example, rectangular or circular.
- the substrate 100 is formed using, for example, polyethylene naphthalate (PEN), polyether sulphone (PES), polyethylene terephthalate (PET), or polyimide.
- the substrate 100 is a resin substrate
- an inorganic barrier film of SiNx, SiON or the like is formed on at least one surface (preferably, both surfaces) of the substrate 100 in order to prevent moisture from permeating the substrate 100 .
- the substrate 100 is formed of a resin substrate
- the light-emitting unit 140 is formed on one surface of the substrate 100 .
- the light-emitting unit 140 has a configuration in which the first electrode 110 , the organic layer 120 including a light-emitting layer, and the second electrode 130 are laminated in this order.
- the plurality of light-emitting units 140 extend linearly (for example, in straight lines).
- the plurality of light-emitting units 140 preferably extend in parallel with each other.
- the plurality of light-emitting units 140 may be disposed to form a matrix or may be configured to form a segment or display a predetermined shape (to display, for example, an icon).
- the plurality of light-emitting units 140 are formed for each pixel.
- the first electrode 110 is a transparent electrode having optical transparency.
- a material of the transparent electrode is a metal oxide formed of a material containing a metal, for example, an indium tin oxide (ITO), an indium zinc oxide (IZO), an indium tungsten zinc oxide (IWZO), a zinc oxide (ZnO) or the like.
- the thickness of the first electrode 110 is, for example, equal to or greater than 10 nm and equal to or less than 500 nm.
- the first electrode 110 is formed by, for example, sputtering or vapor deposition. Meanwhile, the first electrode 110 may be a conductive organic material such as a carbon nanotube or PEDOT/PSS.
- the first electrode 110 may have a laminated structure in which a plurality of films are laminated.
- a plurality of linear first electrodes 110 are formed on the substrate 100 in parallel with each other. Therefore, the first electrode 110 is not located in the second region 104 and the third region 106 .
- the organic layer 120 includes a light-emitting layer.
- the organic layer 120 has a configuration in which, for example, a hole injection layer, a light-emitting layer, and an electron injection layer are laminated in this order.
- a hole transport layer may be formed between the hole injection layer and the light-emitting layer.
- an electron transport layer may be formed between the light-emitting layer and the electron injection layer.
- the organic layer 120 may be formed by vapor deposition.
- at least one layer of the organic layer 120 for example, a layer which is in contact with the first electrode 110 may be formed using a coating method such as ink jetting, printing, or spraying. Meanwhile, in this case, the remaining layers of the organic layer 120 are formed by vapor deposition.
- all the layers of the organic layer 120 may be formed using a coating method.
- another light-emitting layer for example, inorganic light-emitting layer
- the color of light emitted from the light-emitting layer maybe different from or the same as the color of light emitted from a light-emitting layer of an adjacent light-emitting unit 140 (or the color of light which is radiated from the organic layer 120 ).
- the second electrode 130 includes a metal layer constituted of a metal selected from a first group consisting of, for example, Al, Au, Ag, Pt, Mg, Sn, Zn, and In, or an alloy of metals selected from this first group. Therefore, the second electrode 130 has light shielding characteristics or light reflectivity.
- the thickness of the second electrode 130 is, for example, equal to or greater than 10 nm and equal to or less than 500 nm.
- the second electrode 130 is formed by, for example, sputtering or vapor deposition.
- the light-emitting device 10 includes a plurality of linear second electrodes 130 .
- the second electrode 130 is provided for each first electrode 110 and is larger in width than the first electrode 110 .
- the entirety of the first electrode 110 is overlapped and covered with the second electrode 130 in the width direction when seen from the direction perpendicular to the substrate 100 .
- the extraction direction of light emitted from the light-emitting layer of the organic layer 120 can be adjusted. Specifically, the radiation of light to the first surface 100 a side of the light-emitting device 10 can be suppressed.
- the first electrode 110 may be larger in width than the second electrode 130 , and the entirety of the second electrode 130 may be covered with the first electrode 110 in the width direction when seen from a direction perpendicular to the substrate 100 . In this case, the amount of light emitted in the direction of the side of the light-emitting device 10 having the second electrode 130 formed thereon is relatively large.
- the edge of the first electrode 110 is covered with an insulating film 150 .
- the insulating film 150 is formed by adding a photosensitive material in a resin material such as, for example, polyimide, and surrounds a portion of the first electrode 110 which serves as the light-emitting unit 140 . In other words, the insulating film 150 defines the light-emitting unit 140 .
- the insulating film 150 has optical transparency. However, the light transmittance is not required to be high. In a case where the optical transparency of the insulating film 150 is high, the transmittance of the second region 104 described later becomes higher, and the transmittance of the light-emitting device 10 increases.
- the transmittance of the insulating film 150 it is possible to absorb light emitted in the light-emitting unit 140 which is diffused to the insulating film 150 side. Therefore, the light emitted from the light-emitting unit 140 can be emitted without being diffused when seen from the extraction surface.
- the edge of the second electrode 130 in its width direction is located over the insulating film 150 . In other words, when seen from a direction perpendicular to a direction in which the light-emitting unit 140 extends, a portion of the insulating film 150 protrudes from the second electrode 130 .
- the organic layer 120 is also formed on the upper portion and lateral side of the insulating film 150 .
- the light-emitting device 10 When seen from the direction perpendicular to a direction in which the light-emitting unit 140 extends (that is, FIG. 2 ) , the light-emitting device 10 includes a first region 102 , the second region 104 , and the third region 106 .
- the first region 102 is a region overlapping the second electrode 130 . That is, when seen from the direction perpendicular to the substrate 100 , the first region 102 is covered with the second electrode 130 and has a width the same as or different from that of the light-emitting unit 140 . In the example shown in the drawing, the width of the first region 102 is larger than that of the light-emitting unit 140 .
- the first region 102 is a region through which light is not transmitted from the front surface to the rear surface and from the rear surface to the front surface of the light-emitting device 10 or the substrate 100 .
- a region located between the second electrodes 130 serves as a region (light-transmitting region) through which visible light is transmitted.
- This light-transmitting region is constituted by the second region 104 (first light-transmitting region) and the third region 106 (second light-transmitting region).
- the second region 104 is a region of the light-transmitting regions which includes the insulating film 150 .
- the third region 106 is a region of the light-transmitting regions which does not include the insulating film 150 .
- the light transmittance of the third region 106 is higher than the light transmittance of the second region 104 .
- the width of the second region 104 is smaller than the width of the third region 106 . Therefore, the light-emitting device 10 has sufficient optical transparency.
- the width of the third region 106 may be larger or smaller than the width of the first region 102 . In a case where the width of the first region 102 is set to 1, the width of the second region 104 is, for example, equal to or greater than 0 (or greater than 0 or equal to or greater than 0.1) and equal to or less than 0.2, and the width of the third region 106 is, for example, equal to or greater than 0.3 and equal to or less than 2.
- the width of the first region 102 is, for example, equal to or greater than 50 ⁇ m and equal to or less than 500 ⁇ m
- the width of the second region 104 is, for example, equal to or greater than 0 ⁇ m (or greater than 0 ⁇ m) and equal to or less than 100 ⁇ m
- the width of the third region 106 is, for example, equal to or greater than 15 ⁇ m and equal to or less than 1,000 ⁇ m.
- the organic layer 120 is continuously formed in the first region 102 , the second region 104 , and the third region 106 .
- the organic layer 120 of the plurality of light-emitting units 140 is continuously formed.
- the organic layer 120 is not required be formed in the third region 106 .
- the organic layer 120 is not required be formed in the second region 104 . In this case, the transmittance of the second region 104 and the third region 106 becomes higher, and the transmittance of the light-emitting device 10 also becomes higher.
- the light-emitting units 140 maybe lattice-shaped.
- the third region 106 becomes a region of the substrate 100 which is surrounded by the second electrodes 130 .
- the light-emitting device 10 further includes the optical filter 200 .
- the optical filter 200 overlaps at least a portion of the light-transmitting region of the light-emitting device 10 , preferably, the entirety thereof.
- the optical filter 200 is, for example, a light-shielding filter, and is a filter that shields a portion of visible light which is transmitted through the light-transmitting region.
- the transmittance of the visible light is, for example, equal to or greater than 10% and equal to or less than 80%.
- the light-transmitting region of the light-emitting device 10 has the same function as that of light-shielding glass such as smoked glass.
- the optical filter 200 is, for example, a light-transmitting layer or a sheet which is lightly colored in black.
- the optical filter 200 may be a color filter. In this case, the optical filter 200 transmits less light having a desired wavelength region than light having other wavelength regions.
- the optical filter 200 is provided on a surface (second surface 100 b ) of the substrate 100 on the opposite side to the light-emitting unit 140 .
- the optical filter 200 covers the entirety of the third region 106 , the entirety of the second region 104 , and a portion of the first region 102 .
- the edge of the optical filter 200 overlaps a portion of the first region 102 except the light-emitting unit 140 , specifically, a region of the second electrode 130 which is located outside the light-emitting unit 140 .
- a distance w 1 between the edge of the optical filter 200 and the edge of the second electrode 130 is, for example, equal to or greater than 0 pm and equal to or less than 1,000 ⁇ m.
- the first electrode 110 is formed on the substrate 100 by, for example, sputtering.
- the first electrode 110 is formed in a predetermined pattern by, for example, photolithography.
- the insulating film 150 is formed on the edge of the first electrode 110 .
- the organic layer 120 and the second electrode 130 are formed in this order.
- the organic layer 120 includes a layer which is formed by vapor deposition, this layer is formed in a predetermined pattern using, for example, a mask or the like.
- the second electrode 130 is also formed in a predetermined pattern using, for example, a mask or the like.
- the light-emitting unit 140 is sealed using a sealing member (not shown).
- the optical filter 200 is provided on the second surface 100 b of the substrate 100 .
- the optical filter 200 is formed by, for example, coating (for example, screen printing).
- a position at which the optical filter 200 is formed is determined on the basis of, for example, the positions of the insulating film 150 and the second electrode 130 .
- the optical filter 200 may be formed in advance in a sheet shape.
- the optical filter 200 is attached to the second surface 100 b of the substrate 100 using, for example, an adhesive layer (or pressure-sensitive adhesive layer).
- the optical filter 200 covers the light-transmitting region of the light-emitting device 10 but does not cover the light-emitting unit 140 . Therefore, it is possible to restrict the amount and color of light which is transmitted through the light-emitting device 10 . In addition, the amount and color of light which is radiated from the light-emitting device 10 are not restricted.
- FIG. 3 is a cross-sectional view illustrating a configuration of a light-emitting device 10 according to Modification Example 1 and corresponds to FIG. 1 of the embodiment.
- the light-emitting device 10 according to the present modification example has the same configuration as that of the light-emitting device 10 according to the embodiment, except that the edge of the optical filter 200 overlaps a region of the light-emitting unit 140 which is close to the insulating film 150 .
- the width w 3 of a portion of the light-emitting unit 140 which is covered with the optical filter 200 is preferably equal to or less than 10% of the width of the light-emitting unit 140 .
- the optical filter 200 covers the light-transmitting region of the light-emitting device 10 , and thus it is also possible to restrict the amount and color of light which is transmitted through the light-emitting device 10 .
- the optical filter 200 covers only a fraction of the light-emitting unit 140 , the amount and color of light which is radiated from the light-emitting device 10 is not substantially restricted.
- FIG. 4 is a cross-sectional view illustrating a configuration of a light-emitting device 10 according to Modification Example 2 and corresponds to FIG. 1 of the embodiment.
- the light-emitting device 10 according to the present modification example has the same configuration as that of the light-emitting device 10 according to the embodiment, except that the edge of the optical filter 200 overlaps a region of the third region 106 (second light-transmitting region) which is close to the insulating film 150 .
- the optical filter 200 covers a portion of the third region 106 which excludes the edge but does not cover the edge of the third region 106 , the second region 104 , and the first region 102 (including the light-emitting unit 140 ).
- a distance between the edge of the second region 104 and the edge of the optical filter 200 in other words, a distance w 4 between the edge of the second electrode 130 and the edge of the optical filter 200 is preferably equal to or less than 10% of the length obtained by adding the second region 104 to the third region 106 .
- the optical filter 200 covers a large portion of the third region 106 , and thus it is also possible to restrict the amount and color of light which is transmitted through the light-emitting device 10 .
- the optical filter 200 does not cover the light-emitting unit 140 , the amount and color of light which is radiated from the light-emitting device 10 are not restricted.
- the edge of the optical filter 200 may overlap the second region 104 (first light-transmitting region).
- FIG. 5 is a cross-sectional view illustrating a configuration of a light-emitting device 10 according to Modification Example 3 and corresponds to FIG. 1 of the embodiment.
- the light-emitting device 10 according to the present modification example has the same configuration as that of the light-emitting device 10 according to the embodiment, except that a sheet member 210 is included therein.
- the sheet member 210 is, for example, a transparent resin, and is installed onto the second surface 100 b of the substrate 100 using an adhesive layer 212 (or pressure-sensitive adhesive layer).
- the optical filter 200 is formed at least in a region of the sheet member 210 which faces the third region 106 . However, the optical filter 200 is not formed in a region of the sheet member 210 which overlaps the light-emitting unit 140 .
- a relative position between the optical filter 200 and the first region 102 , the second region 104 , and the third region 106 is as shown in the embodiment.
- this relative position may be the same as that in FIG. 2 , may be the same as that in FIG. 3 , and may be the same as that in FIG. 4 .
- the optical filter 200 is provided on a surface of the sheet member 210 on the opposite side to the substrate 100 .
- the optical filter 200 may be provided on a surface of the sheet member 210 which faces the substrate 100 .
- the optical filter 200 may be formed by coloring a portion of the sheet member 210 .
- the optical filter 200 can be installed onto the substrate 100 by attaching the sheet member 210 onto the substrate 100 , and thus the optical filter 200 can be easily installed onto the substrate 100 .
- the refractive index of the sheet member 210 is between the refractive index of air and the refractive index of the substrate 100 , it is possible to improve the light extraction efficiency of the light-emitting device 10 .
- FIG. 6 is a cross-sectional view illustrating a configuration of a light-emitting device 10 according to Modification Example 4.
- the light-emitting device 10 according to the present modification example has the same configuration as that of the light-emitting device 10 according to Modification Example 3, except that the optical filter 200 is provided on the first surface 100 a side of the substrate 100 .
- the light-emitting device 10 includes a sealing member 180 .
- the sealing member 180 seals the light-emitting unit 140 .
- the sealing member 180 is a sheet-shaped member (for example, a resin sheet coated with an inorganic material on both sides thereof) and is installed on the substrate 100 and the light-emitting unit 140 with an insulating layer 182 (adhesive layer) interposed therebetween.
- the optical filter 200 is provided on a surface of the sealing member 180 on the opposite side to the substrate 100 .
- the sealing member 180 may have another structure (for example, so-called can encapsulation structure).
- the optical filter 200 covers all of the first region 102 , the second region 104 , and the third region 106 . In other words, the optical filter 200 does not have an opening at a position overlapping the light-emitting unit 140 .
- the optical filter 200 may be provided on the sheet member 210 .
- the sheet member 210 is attached to the sealing member 180 using the adhesive layer 212 shown in FIG. 5 .
- the optical filter 200 may be provided on a surface of the sheet member 210 which faces the sealing member 180 , may be provided on a surface of the sheet member 210 on the opposite side to the sealing member 180 , and may be provided inside the sheet member 210 .
- the optical filter 200 is provided on a surface of the light-emitting device 10 on the opposite side to a light emission surface, the amount and color of light which is radiated from the light-emitting device 10 are not restricted.
- a pattern is not required to be provided in the optical filter 200 , a relative position between the light-emitting unit 140 and the optical filter 200 is not required to be aligned when the optical filter 200 is installed on the substrate 100 . Therefore, the yield rate of the light-emitting device 10 is improved.
- a function of the optical filter 200 may be given to the sealing member 180 by coloring the sealing member 180 .
- the sealing member 180 also serves as the optical filter 200 , the cost of the light-emitting device 10 is reduced.
- FIG. 7 is a cross-sectional view of a light-emitting system including a light-emitting device 10 according to Modification Example 5 and a light-transmitting member 20 .
- FIG. 8 is a plan view of the light-transmitting member 20 shown in FIG. 7 .
- the substrate 100 is installed on one surface of the light-transmitting member 20 (holding member).
- the light-transmitting member 20 is, for example, window glass.
- the light emission surface (second surface 100 b ) of the substrate 100 faces, for example, the light-transmitting member 20 .
- light emitted by the light-emitting unit 140 is radiated to the outside of a building or a moving object through the light-transmitting member 20 .
- the light-emitting unit 140 is provided on the outer surface of a building or a moving object, the light emission surface of the substrate 100 faces an opposite side to the light-transmitting member 20 .
- the light-transmitting member 20 is provided with a pattern 22 for giving light shielding characteristics.
- the pattern 22 is formed by, for example, bonding a light shielding layer, mixing a material to lower transmittance with a material of the light-transmitting member 20 , mixing a material of light shielding characteristics with glass in a case where the light-transmitting member has a structure in which glass and glass are coupled, or forming a light-shielding material in an intermediate layer located between glass and glass.
- the pattern 22 is not provided in a region (substrate holding region 24 ) of the light-transmitting member 20 which overlaps the substrate 100 .
- a portion of the light-emitting device 10 except the light-transmitting member 20 has a configuration shown in the embodiment and any of Modification Examples 1 to 4.
- the optical filter 200 is located between the substrate 100 and the light-transmitting member 20 , and in a region which does not overlap the plurality of light-emitting units 140 .
- the optical filter 200 does not overlap at least a large portion (preferably the entirety) of the light-emitting unit 140 .
- the optical filter 200 overlaps a surface of the plurality of light-emitting units 140 on the opposite side to the light emission surface. In this case, the optical filter 200 may overlap the light-emitting unit 140 .
- the optical filter 200 Since the optical filter 200 is provided, it is possible to restrict the amount and color of light which is transmitted through the light-emitting device 10 . On the other hand, the amount and color of light which is radiated from the light-emitting device 10 are not restricted by the optical filter 200 . In addition, it is possible to reduce a difference between the transmittance of the light-transmitting member 20 and the transmittance of the light-emitting device 10 . In other words, in a case where the light-emitting system is viewed, it is possible to reduce a difference in appearance between a portion provided with the light-emitting device 10 and the other portions.
- the transmittance of the optical filter 200 is preferably higher than the transmittance of a region of the light-transmitting member 20 which is provided with the pattern 22 .
- the reason is as follows.
- the light transmittance of the first region 102 is substantially 0%.
- the area (substantially equal to the area of the substrate holding region 24 ) of the light-emitting device 10 installed in the substrate holding region 24 of the light-transmitting member 20 is set to S, and the area of the first region 102 is set to A.
- the width of the second electrode 130 is small, the second electrode 130 is hardly visibly recognizable to the human eye.
- the area of a region of the substrate holding region 24 through which light is transmitted is “S-A”, the amount of light which is transmitted through the substrate holding region 24 becomes smaller.
- the substrate holding region 24 becomes darker overall than in a case where the second electrode 130 is not present. Therefore, in a case where the transmittance of the optical filter 200 is the same as the transmittance of the pattern 22 of the light-transmitting member 20 , the apparent transmittance of visible light of the light-emitting device 10 (that is, substrate holding region 24 ) becomes lower by A/S than the transmittance (hereinafter, referred to as B) of a region of the light-transmitting member 20 which has the pattern 22 .
- the light transmittance thereof is equal to or greater than 80% and equal to or less than 120% of the transmittance of visible light of a region of the light-transmitting member 20 which is provided with the pattern 22 , preferably equal to or greater than 90% and equal to or less than 110%, more preferably equal to or greater than 95% and equal to or less than 105%, and further more preferably equal to or greater than 99% and equal to or less than 101%.
- the transmittance of light of a region in which the substrate holding region 24 and the light-emitting device 10 overlap each other is defined and measured, for example, as follows.
- the area of a region overlapping the first region 102 is set to S 1
- the area of a region overlapping the second region 104 is set to S 2
- the area of a region overlapping the third region 106 is set to S 3 .
- the transmittance of light of a region overlapping the first region 102 is set to X
- the transmittance of light of a region overlapping the second region 104 is set to Y
- the transmittance of light of a region overlapping the third region 106 is set to Z.
- the transmittance of light which is transmitted through the substrate holding region 24 and the light-emitting device 10 is regarded as (S 1 ⁇ X+S 2 ⁇ Y+S 3 ⁇ Z)/(X+Y+Z) ⁇ 100(%).
- the transmittance of light of a region in which the substrate holding region 24 and the light-emitting device 10 overlap each other may be measured using a method of measuring total light transmittance specified in JIS K 7375:2008. Further, in a case where the intensity of light incident on the entire surface of the light-emitting device 10 from the first surface 100 a side of the substrate 100 is set to P, and the intensity of light emitted from the second surface 100 b side of the substrate 100 is set to T, the transmittance of light of a region in which the substrate holding region 24 and the light-emitting device 10 overlap each other may be set to T/P ⁇ 100%.
- a method of measuring the transmittance of light of a region in which the substrate holding region 24 and the light-emitting device 10 overlap each other is not limited to these examples.
- the transmittance of visible light transmitted through the substrate holding region 24 of the light-transmitting member 20 , the optical filter 200 , and the light-emitting device 10 may be equal to or greater than 80% and equal to or less than 120% of the transmittance of visible light of the pattern 22 (peripheral region) of the light-transmitting member 20 .
- the transmittance of visible light of a region of the light-transmitting member 20 which is not provided with the light-emitting device 10 can also be regarded as the transmittance of visible light in a region in which the light-transmitting member 20 and the pattern 22 overlap each other.
- the first region 102 of the light-emitting device is a region in which the light-reflective second electrode 130 is formed, and its light transmittance is substantially 0%.
- the transmittance of the optical filter 200 is the same as the transmittance of the pattern 22 of the light-transmitting member 20 , the apparent transmittance in the light-emitting device 10 and the substrate holding region 24 becomes lower by A/S than the transmittance (hereinafter, referred to as B) of the pattern 22 portion. Consequently, the transmittance of the optical filter 200 is adjusted by B ⁇ A/S, and thus it is possible to make it hard to feel a difference in apparent transmittance between the light-emitting device 10 and the substrate holding region 24 and the pattern 22 .
- FIG. 9 is a plan view of a light-transmitting member 20 according to Modification Example 6.
- the present modification example has the same configuration as that of the light-emitting device 10 according to Modification Example 5, except for the following points.
- the light-emitting device 10 does not include the optical filter 200 .
- the pattern 22 is also formed in the substrate holding region 24 of the light-transmitting member 20 , except for a region overlapping the light-emitting unit 140 .
- the pattern 22 is provided in at least a portion of the light-transmitting member 20 which overlaps the third region 106 but is not provided in a region of the light-transmitting member 20 which overlaps the light-emitting unit 140 .
- a region of the pattern 22 which overlaps the substrate 100 functions as an optical filter.
- a relative position between the pattern 22 in the substrate holding region 24 and the insulating film 150 , and the second electrode 130 is the same as the relative position between the optical filter 200 in the embodiment or any of Modification Examples 1 to 4 and the insulating film 150 , and the second electrode 130 .
- the light transmittance of a portion of the pattern 22 which is located in the substrate holding region 24 may be higher than the light transmittance of other portions of the pattern 22 .
- a difference between the light transmittance of visible light of a region of the light-transmitting member 20 which is not provided with the substrate 100 and the light transmittance of visible light of a region in which the light-transmitting member 20 and the substrate 100 overlap each other can be made smaller (for example, equal to or less than 10%, preferably equal to or less than 5%, more preferably equal to or less than 1%).
- the present modification example it is possible to restrict the amount and color of light which is transmitted through the light-emitting device 10 .
- the amount and color of light which are radiated from the light-emitting device 10 are not restricted.
- the optical filter 200 is not required to be installed on the substrate 100 .
Abstract
A light-emitting system includes a light-emitting device, and a holding member holding the light-emitting device. The light-emitting device includes a light-transmitting substrate, a plurality of light-emitting units provided on a first surface of the substrate away from each other, each light-emitting unit comprising a light-transmitting first electrode, a light-reflective second electrode, and an organic layer located between the first electrode and the second electrode, a light-transmitting region which is located between the light-emitting units, and through which light is transmitted in a thickness direction, and an optical filter that overlaps the light-transmitting region and does not overlap the plurality of light-emitting units. The holding member includes a pattern for giving light shielding characteristics.
Description
- This application is a Continuation of U.S. patent application Ser. No. 17/153,813, filed on Jan. 20, 2021, which is a Continuation of U.S. patent application Ser. No. 16/077,365, filed on Aug. 10, 2018, which is a National State Entry of International Patent Application No. PCT/JP2017/004916, filed on Feb. 10, 2017, with benefitting priority from Japanese Patent Application No. 2016-025293, filed on Feb. 12, 2016, the entire contents of which is incorporated herein by reference.
- The present invention relates to a light-emitting device.
- In recent years, there has been progress in the development of light-emitting devices using an organic EL. Such a light-emitting device is used as an illumination device or a display device and has a configuration in which an organic layer is interposed between a first electrode and a second electrode. Generally, a transparent material is used for the first electrode, and a metal material is used for the second electrode.
- One of the light-emitting devices using an organic EL is a technology described in
Patent Document 1. In the technique ofPatent Document 1, the second electrode is provided only in a portion of a pixel in order to cause a display device using an organic EL to have optical transparency (see-through property). In such a structure, since a region located between a plurality of second electrodes transmits light, the display device can have optical transparency. Meanwhile, in the technique disclosed inPatent Document 1, a light-transmitting insulating film is formed between the plurality of second electrodes in order to define a pixel. InPatent Document 1, an example of a material of this insulating film includes an inorganic material such as a silicon oxide, or a resin material such as an acrylic resin. - [Patent Document 1] Japanese Unexamined Patent Publication No. 2011-23336
- Depending on the application of a light-transmitting light-emitting device, the amount and color of light transmitted through the light-emitting device may be desired to be restricted. Even in such a case, it is often the case that the amount and color of light which is radiated from a light-emitting unit of the light-emitting device is not desired to be restricted.
- An exemplary problem to be solved by the present invention is to restrict the amount and color of light which is transmitted through a light-emitting device having optical transparency and to prevent the amount and color of light which is radiated from a light-emitting unit from being restricted.
- According to the invention of
claim 1, there is provided a light-emitting device including: a light-transmitting substrate; a plurality of light-emitting units, provided on a first surface of the substrate away from each other, each light-emitting unit including a light-transmitting first electrode, a light-reflective second electrode, and an organic layer located between the first electrode and the second electrode; a light-transmitting region which is located between the light-emitting units, and through which light is transmitted in a thickness direction; and an optical filter that overlaps the light-transmitting region, and does not overlap the plurality of light-emitting units or overlaps a surface of the plurality of light-emitting units on an opposite side to a light emission surface. - The above and other objects, features and advantages will be made clearer from certain preferred embodiment described below, and the following accompanying drawings.
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FIG. 1 is a cross-sectional view illustrating a configuration of a light-emitting device according to an embodiment. -
FIG. 2 is a plan view of the light-emitting device. -
FIG. 3 is a cross-sectional view illustrating a configuration of a light-emitting device according to Modification Example 1. -
FIG. 4 is a cross-sectional view illustrating a configuration of a light-emitting device according to Modification Example 2. -
FIG. 5 is a cross-sectional view illustrating a configuration of a light-emitting device according to Modification Example 3. -
FIG. 6 is a cross-sectional view illustrating a configuration of a light-emitting device according to Modification Example 4. -
FIG. 7 is a cross-sectional view of a light-emitting device according to Modification Example 5. -
FIG. 8 is a plan view of a light-transmitting member shown inFIG. 7 . -
FIG. 9 is a plan view of a light-transmitting member according to Modification Example 6. - Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In all the drawings, like elements are referenced by like reference numerals and the descriptions thereof will not be repeated.
- (Embodiment)
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FIG. 1 is a cross-sectional view illustrating a configuration of a light-emitting device 10 according to an embodiment.FIG. 2 is a plan view of the light-emitting device 10.FIG. 1 corresponds to a cross-section A-A ofFIG. 2 . The light-emitting device 10 according to the embodiment includes a light-transmittingsubstrate 100, a plurality of light-emitting units 140, a light-transmitting region (second region 104 and third region 106), and anoptical filter 200. The plurality of light-emitting units 140 are provided on afirst surface 100 a of thesubstrate 100 and are separated from each other. The light-emittingunit 140 includes a light-transmittingfirst electrode 110, anorganic layer 120, and a light-reflectivesecond electrode 130. Theorganic layer 120 is located between thefirst electrode 110 and thesecond electrode 130. The light-transmitting region is located between the light-emittingunits 140 and transmits light in the thickness direction of the light-emittingdevice 10. Theoptical filter 200 overlaps the light-transmitting region and does not overlap the plurality of light-emittingunits 140. Meanwhile, theoptical filter 200 may overlap the end of the light-emittingunit 140. However, as shown in a modification example described later, theoptical filter 200 may cover the surface of the light-emittingunit 140 on the opposite side to a light emission surface. In other words, theoptical filter 200 is not located on the light emission side of the light-emitting unit 140. Hereinafter, a detailed description will be given. - The
substrate 100 is, for example, a glass substrate or a resin substrate which has optical transparency. Thesubstrate 100 may have flexibility. In a case where the substrate has flexibility, the thickness of thesubstrate 100 is, for example, equal to or greater than 10 μm and equal to or less than 1,000 μm. Thesubstrate 100 is polygonal such as, for example, rectangular or circular. In a case where thesubstrate 100 is a resin substrate, thesubstrate 100 is formed using, for example, polyethylene naphthalate (PEN), polyether sulphone (PES), polyethylene terephthalate (PET), or polyimide. In addition, in a case where thesubstrate 100 is a resin substrate, it is preferable that an inorganic barrier film of SiNx, SiON or the like is formed on at least one surface (preferably, both surfaces) of thesubstrate 100 in order to prevent moisture from permeating thesubstrate 100. Meanwhile, in a case where thesubstrate 100 is formed of a resin substrate, there are a method of directly forming thefirst electrode 110 and theorganic layer 120, described later, on the resin substrate, a method of forming thefirst electrode 110 and subsequent layers on a glass substrate, then peeling off thefirst electrode 110 and the glass substrate, and further disposing a peeled-off laminate on the resin substrate, and the like. - The light-emitting
unit 140 is formed on one surface of thesubstrate 100. The light-emittingunit 140 has a configuration in which thefirst electrode 110, theorganic layer 120 including a light-emitting layer, and thesecond electrode 130 are laminated in this order. In a case where the light-emitting device 10 is an illumination device, the plurality of light-emittingunits 140 extend linearly (for example, in straight lines). The plurality of light-emitting units 140 preferably extend in parallel with each other. On the other hand, in a case where the light-emitting device 10 is a display device, the plurality of light-emitting units 140 may be disposed to form a matrix or may be configured to form a segment or display a predetermined shape (to display, for example, an icon). The plurality of light-emittingunits 140 are formed for each pixel. - The
first electrode 110 is a transparent electrode having optical transparency. A material of the transparent electrode is a metal oxide formed of a material containing a metal, for example, an indium tin oxide (ITO), an indium zinc oxide (IZO), an indium tungsten zinc oxide (IWZO), a zinc oxide (ZnO) or the like. The thickness of thefirst electrode 110 is, for example, equal to or greater than 10 nm and equal to or less than 500 nm. Thefirst electrode 110 is formed by, for example, sputtering or vapor deposition. Meanwhile, thefirst electrode 110 may be a conductive organic material such as a carbon nanotube or PEDOT/PSS. In addition, thefirst electrode 110 may have a laminated structure in which a plurality of films are laminated. In the drawing, a plurality of linearfirst electrodes 110 are formed on thesubstrate 100 in parallel with each other. Therefore, thefirst electrode 110 is not located in thesecond region 104 and thethird region 106. - The
organic layer 120 includes a light-emitting layer. Theorganic layer 120 has a configuration in which, for example, a hole injection layer, a light-emitting layer, and an electron injection layer are laminated in this order. A hole transport layer may be formed between the hole injection layer and the light-emitting layer. In addition, an electron transport layer may be formed between the light-emitting layer and the electron injection layer. Theorganic layer 120 may be formed by vapor deposition. In addition, at least one layer of theorganic layer 120, for example, a layer which is in contact with thefirst electrode 110 may be formed using a coating method such as ink jetting, printing, or spraying. Meanwhile, in this case, the remaining layers of theorganic layer 120 are formed by vapor deposition. In addition, all the layers of theorganic layer 120 may be formed using a coating method. Meanwhile, another light-emitting layer (for example, inorganic light-emitting layer) may be included instead of theorganic layer 120. In addition, the color of light emitted from the light-emitting layer (or the color of light which is radiated from the organic layer 120) maybe different from or the same as the color of light emitted from a light-emitting layer of an adjacent light-emitting unit 140 (or the color of light which is radiated from the organic layer 120). - The
second electrode 130 includes a metal layer constituted of a metal selected from a first group consisting of, for example, Al, Au, Ag, Pt, Mg, Sn, Zn, and In, or an alloy of metals selected from this first group. Therefore, thesecond electrode 130 has light shielding characteristics or light reflectivity. The thickness of thesecond electrode 130 is, for example, equal to or greater than 10 nm and equal to or less than 500 nm. Thesecond electrode 130 is formed by, for example, sputtering or vapor deposition. In the example shown in the drawing, the light-emittingdevice 10 includes a plurality of linearsecond electrodes 130. Thesecond electrode 130 is provided for eachfirst electrode 110 and is larger in width than thefirst electrode 110. For this reason, the entirety of thefirst electrode 110 is overlapped and covered with thesecond electrode 130 in the width direction when seen from the direction perpendicular to thesubstrate 100. With such a configuration, the extraction direction of light emitted from the light-emitting layer of theorganic layer 120 can be adjusted. Specifically, the radiation of light to thefirst surface 100 a side of the light-emittingdevice 10 can be suppressed. Alternatively, thefirst electrode 110 may be larger in width than thesecond electrode 130, and the entirety of thesecond electrode 130 may be covered with thefirst electrode 110 in the width direction when seen from a direction perpendicular to thesubstrate 100. In this case, the amount of light emitted in the direction of the side of the light-emittingdevice 10 having thesecond electrode 130 formed thereon is relatively large. - The edge of the
first electrode 110 is covered with an insulatingfilm 150. The insulatingfilm 150 is formed by adding a photosensitive material in a resin material such as, for example, polyimide, and surrounds a portion of thefirst electrode 110 which serves as the light-emittingunit 140. In other words, the insulatingfilm 150 defines the light-emittingunit 140. The insulatingfilm 150 has optical transparency. However, the light transmittance is not required to be high. In a case where the optical transparency of the insulatingfilm 150 is high, the transmittance of thesecond region 104 described later becomes higher, and the transmittance of the light-emittingdevice 10 increases. On the other hand, by reducing the transmittance of the insulatingfilm 150, it is possible to absorb light emitted in the light-emittingunit 140 which is diffused to the insulatingfilm 150 side. Therefore, the light emitted from the light-emittingunit 140 can be emitted without being diffused when seen from the extraction surface. The edge of thesecond electrode 130 in its width direction is located over the insulatingfilm 150. In other words, when seen from a direction perpendicular to a direction in which the light-emittingunit 140 extends, a portion of the insulatingfilm 150 protrudes from thesecond electrode 130. In addition, in the example shown in the drawing, theorganic layer 120 is also formed on the upper portion and lateral side of the insulatingfilm 150. - When seen from the direction perpendicular to a direction in which the light-emitting
unit 140 extends (that is,FIG. 2 ) , the light-emittingdevice 10 includes afirst region 102, thesecond region 104, and thethird region 106. - The
first region 102 is a region overlapping thesecond electrode 130. That is, when seen from the direction perpendicular to thesubstrate 100, thefirst region 102 is covered with thesecond electrode 130 and has a width the same as or different from that of the light-emittingunit 140. In the example shown in the drawing, the width of thefirst region 102 is larger than that of the light-emittingunit 140. Thefirst region 102 is a region through which light is not transmitted from the front surface to the rear surface and from the rear surface to the front surface of the light-emittingdevice 10 or thesubstrate 100. - A region located between the
second electrodes 130 serves as a region (light-transmitting region) through which visible light is transmitted. This light-transmitting region is constituted by the second region 104 (first light-transmitting region) and the third region 106 (second light-transmitting region). Thesecond region 104 is a region of the light-transmitting regions which includes the insulatingfilm 150. Thethird region 106 is a region of the light-transmitting regions which does not include the insulatingfilm 150. The light transmittance of thethird region 106 is higher than the light transmittance of thesecond region 104. - The width of the
second region 104 is smaller than the width of thethird region 106. Therefore, the light-emittingdevice 10 has sufficient optical transparency. In addition, the width of thethird region 106 may be larger or smaller than the width of thefirst region 102. In a case where the width of thefirst region 102 is set to 1, the width of thesecond region 104 is, for example, equal to or greater than 0 (or greater than 0 or equal to or greater than 0.1) and equal to or less than 0.2, and the width of thethird region 106 is, for example, equal to or greater than 0.3 and equal to or less than 2. In addition, the width of thefirst region 102 is, for example, equal to or greater than 50 μm and equal to or less than 500 μm, the width of thesecond region 104 is, for example, equal to or greater than 0 μm (or greater than 0 μm) and equal to or less than 100 μm, and the width of thethird region 106 is, for example, equal to or greater than 15 μm and equal to or less than 1,000 μm. - Meanwhile, in the example shown in
FIG. 1 , at least a portion of the layers of theorganic layer 120 is continuously formed in thefirst region 102, thesecond region 104, and thethird region 106. In other words, theorganic layer 120 of the plurality of light-emittingunits 140 is continuously formed. With such a configuration, it is not necessary to use a mask when a continuous layer of theorganic layer 120 is formed, and thus the manufacturing cost of theorganic layer 120 can be reduced. However, theorganic layer 120 is not required be formed in thethird region 106. In addition, theorganic layer 120 is not required be formed in thesecond region 104. In this case, the transmittance of thesecond region 104 and thethird region 106 becomes higher, and the transmittance of the light-emittingdevice 10 also becomes higher. - In addition, the light-emitting
units 140 maybe lattice-shaped. In this case, thethird region 106 becomes a region of thesubstrate 100 which is surrounded by thesecond electrodes 130. - The light-emitting
device 10 further includes theoptical filter 200. Theoptical filter 200 overlaps at least a portion of the light-transmitting region of the light-emittingdevice 10, preferably, the entirety thereof. Theoptical filter 200 is, for example, a light-shielding filter, and is a filter that shields a portion of visible light which is transmitted through the light-transmitting region. In a region of the light-transmitting region of the light-emittingdevice 10 which overlaps theoptical filter 200, the transmittance of the visible light is, for example, equal to or greater than 10% and equal to or less than 80%. In this manner, the light-transmitting region of the light-emittingdevice 10 has the same function as that of light-shielding glass such as smoked glass. Theoptical filter 200 is, for example, a light-transmitting layer or a sheet which is lightly colored in black. - However, the
optical filter 200 may be a color filter. In this case, theoptical filter 200 transmits less light having a desired wavelength region than light having other wavelength regions. - In the example shown in
FIG. 1 , theoptical filter 200 is provided on a surface (second surface 100 b) of thesubstrate 100 on the opposite side to the light-emittingunit 140. Theoptical filter 200 covers the entirety of thethird region 106, the entirety of thesecond region 104, and a portion of thefirst region 102. In other words, the edge of theoptical filter 200 overlaps a portion of thefirst region 102 except the light-emittingunit 140, specifically, a region of thesecond electrode 130 which is located outside the light-emittingunit 140. The width of a region in which theoptical filter 200 and thesecond electrode 130 overlap each other, in other words, a distance w1 between the edge of theoptical filter 200 and the edge of thesecond electrode 130 is, for example, equal to or greater than 0 pm and equal to or less than 1,000 μm. With such a configuration, even in a case where variation occurs in the position of theoptical filter 200 with respect to the light-transmitting region (third region 106 and second region 104), or the width of theoptical filter 200, it is possible to prevent a portion of the light-transmitting region which is not covered with theoptical filter 200 from occurring. - Next, a method of manufacturing the light-emitting
device 10 will be described. First, thefirst electrode 110 is formed on thesubstrate 100 by, for example, sputtering. Next, thefirst electrode 110 is formed in a predetermined pattern by, for example, photolithography. Next, the insulatingfilm 150 is formed on the edge of thefirst electrode 110. For example, in a case where the insulatingfilm 150 is formed of a photosensitive resin, the insulatingfilm 150 is formed in a predetermined pattern by undergoing exposure and development steps. Next, theorganic layer 120 and thesecond electrode 130 are formed in this order. In a case where theorganic layer 120 includes a layer which is formed by vapor deposition, this layer is formed in a predetermined pattern using, for example, a mask or the like. Thesecond electrode 130 is also formed in a predetermined pattern using, for example, a mask or the like. Thereafter, the light-emittingunit 140 is sealed using a sealing member (not shown). - The
optical filter 200 is provided on thesecond surface 100 b of thesubstrate 100. Theoptical filter 200 is formed by, for example, coating (for example, screen printing). At this time, a position at which theoptical filter 200 is formed is determined on the basis of, for example, the positions of the insulatingfilm 150 and thesecond electrode 130. Meanwhile, theoptical filter 200 may be formed in advance in a sheet shape. In this case, theoptical filter 200 is attached to thesecond surface 100 b of thesubstrate 100 using, for example, an adhesive layer (or pressure-sensitive adhesive layer). - Hereinbefore, according to the present embodiment, the
optical filter 200 covers the light-transmitting region of the light-emittingdevice 10 but does not cover the light-emittingunit 140. Therefore, it is possible to restrict the amount and color of light which is transmitted through the light-emittingdevice 10. In addition, the amount and color of light which is radiated from the light-emittingdevice 10 are not restricted. - ([Modification Example 1])
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FIG. 3 is a cross-sectional view illustrating a configuration of a light-emittingdevice 10 according to Modification Example 1 and corresponds toFIG. 1 of the embodiment. The light-emittingdevice 10 according to the present modification example has the same configuration as that of the light-emittingdevice 10 according to the embodiment, except that the edge of theoptical filter 200 overlaps a region of the light-emittingunit 140 which is close to the insulatingfilm 150. The width w3 of a portion of the light-emittingunit 140 which is covered with theoptical filter 200 is preferably equal to or less than 10% of the width of the light-emittingunit 140. - In the present modification example, the
optical filter 200 covers the light-transmitting region of the light-emittingdevice 10, and thus it is also possible to restrict the amount and color of light which is transmitted through the light-emittingdevice 10. In addition, since theoptical filter 200 covers only a fraction of the light-emittingunit 140, the amount and color of light which is radiated from the light-emittingdevice 10 is not substantially restricted. - ([Modification Example 2])
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FIG. 4 is a cross-sectional view illustrating a configuration of a light-emittingdevice 10 according to Modification Example 2 and corresponds toFIG. 1 of the embodiment. The light-emittingdevice 10 according to the present modification example has the same configuration as that of the light-emittingdevice 10 according to the embodiment, except that the edge of theoptical filter 200 overlaps a region of the third region 106 (second light-transmitting region) which is close to the insulatingfilm 150. - In other words, the
optical filter 200 covers a portion of thethird region 106 which excludes the edge but does not cover the edge of thethird region 106, thesecond region 104, and the first region 102 (including the light-emitting unit 140). However, a distance between the edge of thesecond region 104 and the edge of theoptical filter 200, in other words, a distance w4 between the edge of thesecond electrode 130 and the edge of theoptical filter 200 is preferably equal to or less than 10% of the length obtained by adding thesecond region 104 to thethird region 106. - In the present modification example, the
optical filter 200 covers a large portion of thethird region 106, and thus it is also possible to restrict the amount and color of light which is transmitted through the light-emittingdevice 10. In addition, since theoptical filter 200 does not cover the light-emittingunit 140, the amount and color of light which is radiated from the light-emittingdevice 10 are not restricted. - Meanwhile, the edge of the
optical filter 200 may overlap the second region 104 (first light-transmitting region). - ([Modification Example 3])
-
FIG. 5 is a cross-sectional view illustrating a configuration of a light-emittingdevice 10 according to Modification Example 3 and corresponds toFIG. 1 of the embodiment. The light-emittingdevice 10 according to the present modification example has the same configuration as that of the light-emittingdevice 10 according to the embodiment, except that asheet member 210 is included therein. - The
sheet member 210 is, for example, a transparent resin, and is installed onto thesecond surface 100 b of thesubstrate 100 using an adhesive layer 212 (or pressure-sensitive adhesive layer). Theoptical filter 200 is formed at least in a region of thesheet member 210 which faces thethird region 106. However, theoptical filter 200 is not formed in a region of thesheet member 210 which overlaps the light-emittingunit 140. - Meanwhile, in the drawing, a relative position between the
optical filter 200 and thefirst region 102, thesecond region 104, and thethird region 106 is as shown in the embodiment. However, this relative position may be the same as that inFIG. 2 , may be the same as that inFIG. 3 , and may be the same as that inFIG. 4 . - In addition, in the example shown in the drawing, the
optical filter 200 is provided on a surface of thesheet member 210 on the opposite side to thesubstrate 100. However, theoptical filter 200 may be provided on a surface of thesheet member 210 which faces thesubstrate 100. In addition, theoptical filter 200 may be formed by coloring a portion of thesheet member 210. - In the present modification example, as is the case with the embodiment, it is also possible to restrict the amount and color of light which is transmitted through the light-emitting
device 10. In addition, the amount and color of light which is radiated from the light-emittingdevice 10 are not restricted. Further, theoptical filter 200 can be installed onto thesubstrate 100 by attaching thesheet member 210 onto thesubstrate 100, and thus theoptical filter 200 can be easily installed onto thesubstrate 100. - In addition, in a case where the refractive index of the
sheet member 210 is between the refractive index of air and the refractive index of thesubstrate 100, it is possible to improve the light extraction efficiency of the light-emittingdevice 10. - ([Modification Example 4])
-
FIG. 6 is a cross-sectional view illustrating a configuration of a light-emittingdevice 10 according to Modification Example 4. The light-emittingdevice 10 according to the present modification example has the same configuration as that of the light-emittingdevice 10 according to Modification Example 3, except that theoptical filter 200 is provided on thefirst surface 100 a side of thesubstrate 100. - Specifically, the light-emitting
device 10 includes a sealingmember 180. The sealingmember 180 seals the light-emittingunit 140. In the example shown in the drawing, the sealingmember 180 is a sheet-shaped member (for example, a resin sheet coated with an inorganic material on both sides thereof) and is installed on thesubstrate 100 and the light-emittingunit 140 with an insulating layer 182 (adhesive layer) interposed therebetween. Theoptical filter 200 is provided on a surface of the sealingmember 180 on the opposite side to thesubstrate 100. Meanwhile, the sealingmember 180 may have another structure (for example, so-called can encapsulation structure). - The
optical filter 200 covers all of thefirst region 102, thesecond region 104, and thethird region 106. In other words, theoptical filter 200 does not have an opening at a position overlapping the light-emittingunit 140. - Meanwhile, as is the case with Modification Example 3, the
optical filter 200 may be provided on thesheet member 210. In this case, thesheet member 210 is attached to the sealingmember 180 using theadhesive layer 212 shown inFIG. 5 . Theoptical filter 200 may be provided on a surface of thesheet member 210 which faces the sealingmember 180, may be provided on a surface of thesheet member 210 on the opposite side to the sealingmember 180, and may be provided inside thesheet member 210. - In the present modification example, as is the case with the embodiment, it is also possible to restrict the amount and color of light which is transmitted through the light-emitting
device 10. In addition, since theoptical filter 200 is provided on a surface of the light-emittingdevice 10 on the opposite side to a light emission surface, the amount and color of light which is radiated from the light-emittingdevice 10 are not restricted. In addition, since a pattern is not required to be provided in theoptical filter 200, a relative position between the light-emittingunit 140 and theoptical filter 200 is not required to be aligned when theoptical filter 200 is installed on thesubstrate 100. Therefore, the yield rate of the light-emittingdevice 10 is improved. - Meanwhile, in a case where the sealing
member 180 has optical transparency, a function of theoptical filter 200 may be given to the sealingmember 180 by coloring the sealingmember 180. In this case, since the sealingmember 180 also serves as theoptical filter 200, the cost of the light-emittingdevice 10 is reduced. - ([Modification Example 5])
-
FIG. 7 is a cross-sectional view of a light-emitting system including a light-emittingdevice 10 according to Modification Example 5 and a light-transmittingmember 20.FIG. 8 is a plan view of the light-transmittingmember 20 shown inFIG. 7 . In the present example, thesubstrate 100 is installed on one surface of the light-transmitting member 20 (holding member). The light-transmittingmember 20 is, for example, window glass. In a case where the light-transmittingmember 20 is window glass of a building or a moving object (for example, an automobile, a train, or an airplane), the light emission surface (second surface 100 b) of thesubstrate 100 faces, for example, the light-transmittingmember 20. That is, light emitted by the light-emittingunit 140 is radiated to the outside of a building or a moving object through the light-transmittingmember 20. Meanwhile, in a case where the light-emittingunit 140 is provided on the outer surface of a building or a moving object, the light emission surface of thesubstrate 100 faces an opposite side to the light-transmittingmember 20. - The light-transmitting
member 20 is provided with apattern 22 for giving light shielding characteristics. Thepattern 22 is formed by, for example, bonding a light shielding layer, mixing a material to lower transmittance with a material of the light-transmittingmember 20, mixing a material of light shielding characteristics with glass in a case where the light-transmitting member has a structure in which glass and glass are coupled, or forming a light-shielding material in an intermediate layer located between glass and glass. However, thepattern 22 is not provided in a region (substrate holding region 24) of the light-transmittingmember 20 which overlaps thesubstrate 100. - In the present example, a portion of the light-emitting
device 10 except the light-transmittingmember 20 has a configuration shown in the embodiment and any of Modification Examples 1 to 4. As a first example, theoptical filter 200 is located between thesubstrate 100 and the light-transmittingmember 20, and in a region which does not overlap the plurality of light-emittingunits 140. In this case, theoptical filter 200 does not overlap at least a large portion (preferably the entirety) of the light-emittingunit 140. In addition, as a second example, theoptical filter 200 overlaps a surface of the plurality of light-emittingunits 140 on the opposite side to the light emission surface. In this case, theoptical filter 200 may overlap the light-emittingunit 140. - Since the
optical filter 200 is provided, it is possible to restrict the amount and color of light which is transmitted through the light-emittingdevice 10. On the other hand, the amount and color of light which is radiated from the light-emittingdevice 10 are not restricted by theoptical filter 200. In addition, it is possible to reduce a difference between the transmittance of the light-transmittingmember 20 and the transmittance of the light-emittingdevice 10. In other words, in a case where the light-emitting system is viewed, it is possible to reduce a difference in appearance between a portion provided with the light-emittingdevice 10 and the other portions. In addition, it is possible to reduce the manufacturing costs of the light-emittingdevice 10 and the light-emitting system by mass-producing portions other than theoptical filter 200 of the light-emittingdevice 10 and selecting theoptical filter 200 having a transmittance not different from the transmittance of the light-transmittingmember 20. - Here, the transmittance of the
optical filter 200 is preferably higher than the transmittance of a region of the light-transmittingmember 20 which is provided with thepattern 22. The reason is as follows. - Since the
first region 102 of the light-emittingdevice 10 is a region in which the light-reflectivesecond electrode 130 is formed, the light transmittance of thefirst region 102 is substantially 0%. Here, the area (substantially equal to the area of the substrate holding region 24) of the light-emittingdevice 10 installed in thesubstrate holding region 24 of the light-transmittingmember 20 is set to S, and the area of thefirst region 102 is set to A. As described above, since the width of thesecond electrode 130 is small, thesecond electrode 130 is hardly visibly recognizable to the human eye. However, since the area of a region of thesubstrate holding region 24 through which light is transmitted is “S-A”, the amount of light which is transmitted through thesubstrate holding region 24 becomes smaller. Therefore, thesubstrate holding region 24 becomes darker overall than in a case where thesecond electrode 130 is not present. Therefore, in a case where the transmittance of theoptical filter 200 is the same as the transmittance of thepattern 22 of the light-transmittingmember 20, the apparent transmittance of visible light of the light-emitting device 10 (that is, substrate holding region 24) becomes lower by A/S than the transmittance (hereinafter, referred to as B) of a region of the light-transmittingmember 20 which has thepattern 22. Consequently, by adjusting the transmittance of theoptical filter 200 in a direction of becoming higher than B by B×A/S, it is possible to make it hard to feel a difference between the apparent transmittance of the light-emittingdevice 10 and thesubstrate holding region 24 and that of thepattern 22. - In a case where visible light is transmitted through the
substrate holding region 24 of the light-transmittingmember 20 and the light-emittingdevice 10 by performing the above adjustment, the light transmittance thereof is equal to or greater than 80% and equal to or less than 120% of the transmittance of visible light of a region of the light-transmittingmember 20 which is provided with thepattern 22, preferably equal to or greater than 90% and equal to or less than 110%, more preferably equal to or greater than 95% and equal to or less than 105%, and further more preferably equal to or greater than 99% and equal to or less than 101%. - Meanwhile, the transmittance of light of a region in which the
substrate holding region 24 and the light-emittingdevice 10 overlap each other is defined and measured, for example, as follows. In thesubstrate holding region 24 of the light-transmittingmember 20, the area of a region overlapping thefirst region 102 is set to S1, the area of a region overlapping thesecond region 104 is set to S2, and the area of a region overlapping thethird region 106 is set to S3. In addition, in thesubstrate holding region 24, the transmittance of light of a region overlapping thefirst region 102 is set to X, the transmittance of light of a region overlapping thesecond region 104 is set to Y, and the transmittance of light of a region overlapping thethird region 106 is set to Z. Then, the transmittance of light which is transmitted through thesubstrate holding region 24 and the light-emittingdevice 10 is regarded as (S1×X+S2×Y+S3×Z)/(X+Y+Z)×100(%). - In addition, the transmittance of light of a region in which the
substrate holding region 24 and the light-emittingdevice 10 overlap each other may be measured using a method of measuring total light transmittance specified in JIS K 7375:2008. Further, in a case where the intensity of light incident on the entire surface of the light-emittingdevice 10 from thefirst surface 100 a side of thesubstrate 100 is set to P, and the intensity of light emitted from thesecond surface 100 b side of thesubstrate 100 is set to T, the transmittance of light of a region in which thesubstrate holding region 24 and the light-emittingdevice 10 overlap each other may be set to T/P×100%. - However, a method of measuring the transmittance of light of a region in which the
substrate holding region 24 and the light-emittingdevice 10 overlap each other is not limited to these examples. - Meanwhile, the transmittance of visible light transmitted through the
substrate holding region 24 of the light-transmittingmember 20, theoptical filter 200, and the light-emittingdevice 10 may be equal to or greater than 80% and equal to or less than 120% of the transmittance of visible light of the pattern 22 (peripheral region) of the light-transmittingmember 20. - With such a configuration, when the light-emitting
device 10 does not emit light, a person viewing the light-transmittingmember 20 is not likely to recognize a boundary between a region which is provided with the light-emittingdevice 10 and a region in the periphery thereof. In other words, a person viewing the light-transmittingmember 20 is not likely to notice that the light-emittingdevice 10 is present. Meanwhile, the transmittance of visible light of a region of the light-transmittingmember 20 which is not provided with the light-emittingdevice 10 can also be regarded as the transmittance of visible light in a region in which the light-transmittingmember 20 and thepattern 22 overlap each other. - Here, in the area S (substantially the area of the substrate holding region 24) of the light-emitting
device 10 installed in thesubstrate holding region 24 of the light-transmittingmember 20, thefirst region 102 of the light-emitting device is a region in which the light-reflectivesecond electrode 130 is formed, and its light transmittance is substantially 0%. Here, in a case where an area occupied by thefirst region 102 in S is set to A, and the transmittance of theoptical filter 200 is the same as the transmittance of thepattern 22 of the light-transmittingmember 20, the apparent transmittance in the light-emittingdevice 10 and thesubstrate holding region 24 becomes lower by A/S than the transmittance (hereinafter, referred to as B) of thepattern 22 portion. Consequently, the transmittance of theoptical filter 200 is adjusted by B×A/S, and thus it is possible to make it hard to feel a difference in apparent transmittance between the light-emittingdevice 10 and thesubstrate holding region 24 and thepattern 22. - ([Modification Example 6])
-
FIG. 9 is a plan view of a light-transmittingmember 20 according to Modification Example 6. The present modification example has the same configuration as that of the light-emittingdevice 10 according to Modification Example 5, except for the following points. - In the present modification example, the light-emitting
device 10 does not include theoptical filter 200. Instead thereof, thepattern 22 is also formed in thesubstrate holding region 24 of the light-transmittingmember 20, except for a region overlapping the light-emittingunit 140. In other words, thepattern 22 is provided in at least a portion of the light-transmittingmember 20 which overlaps thethird region 106 but is not provided in a region of the light-transmittingmember 20 which overlaps the light-emittingunit 140. A region of thepattern 22 which overlaps thesubstrate 100 functions as an optical filter. - Meanwhile, a relative position between the
pattern 22 in thesubstrate holding region 24 and the insulatingfilm 150, and thesecond electrode 130 is the same as the relative position between theoptical filter 200 in the embodiment or any of Modification Examples 1 to 4 and the insulatingfilm 150, and thesecond electrode 130. In addition, the light transmittance of a portion of thepattern 22 which is located in thesubstrate holding region 24 may be higher than the light transmittance of other portions of thepattern 22. By appropriately setting a difference between these light transmittances, a difference between the light transmittance of visible light of a region of the light-transmittingmember 20 which is not provided with thesubstrate 100 and the light transmittance of visible light of a region in which the light-transmittingmember 20 and thesubstrate 100 overlap each other can be made smaller (for example, equal to or less than 10%, preferably equal to or less than 5%, more preferably equal to or less than 1%). - According to the present modification example, it is possible to restrict the amount and color of light which is transmitted through the light-emitting
device 10. In addition, the amount and color of light which are radiated from the light-emittingdevice 10 are not restricted. In addition, theoptical filter 200 is not required to be installed on thesubstrate 100. - As described above, although the embodiments and examples of the present invention have been set forth with reference to the accompanying drawings, they are merely illustrative of the present invention, and various configurations other than those stated above can be adopted.
- This application claims priority from Japanese Patent Application No. 2016-025293 filed on Feb. 12, 2016, the content of which is incorporated herein by reference in its entirety.
Claims (6)
1. A light-emitting system comprising:
a light-emitting device; and
a holding member holding the light-emitting device, wherein the light-emitting device comprises:
a light-transmitting substrate;
a plurality of light-emitting units provided on a first surface of the substrate away from each other, each light-emitting unit comprising a light-transmitting first electrode, a light-reflective second electrode, and an organic layer located between the first electrode and the second electrode;
a light-transmitting region which is located between the light-emitting units, and through which light is transmitted in a thickness direction; and
an optical filter that overlaps the light-transmitting region and does not overlap the plurality of light-emitting units, and
wherein the holding member comprises a pattern for giving light shielding characteristics.
2. The light-emitting system according to claim 1 ,
wherein the holding member comprises a first region overlapping the substrate and a second region located around the first region, and
wherein the pattern is located at the second region.
3. The light-emitting system according to claim 2 ,
wherein a transmittance of the optical filter is higher than a transmittance of the second region.
4. The light-emitting system according to claim 1 , further comprising a light-transmitting insulating layer that defines the light-emitting unit,
wherein the light-transmitting region comprises:
a first light-transmitting region that overlaps the insulating layer and does not overlap the second electrode; and
a second light-transmitting region that overlaps neither the insulating layer nor the second electrode, and
wherein an edge of the optical filter overlaps the first light-transmitting region or the second light-transmitting region.
5. The light-emitting system according to claim 1 ,
wherein an edge of the second electrode extends to an outside of the light-emitting unit, and
wherein an edge of the optical filter overlaps a region of the second electrode which is located outside the light-emitting unit.
6. The light-emitting system according to claim 1 , further comprising a light transmitting sheet member provided with the optical filter,
wherein the optical filter is provided in a region of the sheet member which overlaps at least a portion of the light-transmitting region and is not provided in a region of the sheet member which overlaps at least a portion of the light-emitting unit.
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US18/226,035 US20230375763A1 (en) | 2016-02-12 | 2023-07-25 | Light-emitting device |
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JP2016-025293 | 2016-02-12 | ||
JP2016025293 | 2016-02-12 | ||
PCT/JP2017/004916 WO2017138633A1 (en) | 2016-02-12 | 2017-02-10 | Light-emitting device |
US201816077365A | 2018-08-10 | 2018-08-10 | |
US17/153,813 US11754762B2 (en) | 2016-02-12 | 2021-01-20 | Light-emitting device |
US18/226,035 US20230375763A1 (en) | 2016-02-12 | 2023-07-25 | Light-emitting device |
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