JP6993589B2 - Light emitting device and surface light emitting device using light emitting device - Google Patents

Description

The present disclosure relates to a light emitting device and a surface light emitting device using the light emitting device.

As a direct type backlight used in a liquid crystal television or the like, for example, a surface light emitting device as in Patent Document 1 is known.
The light emitting device disclosed in Patent Document 1 has a peripheral wall around a plurality of light sources, and has a frame body arranged in a matrix. This enables local dimming that divides the light emitting area to prevent light from leaking out of the area and controls the amount of light emitted for each light source to increase the contrast ratio in the plurality of areas.

Japanese Unexamined Patent Publication No. 2013-25945

However, the heat generated from the light source may cause the frame to expand and deform the frame.

An embodiment of the present invention provides a light emitting device capable of suppressing deformation of a frame and a surface light emitting device using the same.

The light emitting device according to the present embodiment has a substrate on which a plurality of light sources are arranged, a first plane portion having a first opening in which the light sources are arranged, and a first wall portion surrounding the first plane portion. A second reflection member having a plurality of first reflection members having a plurality of recesses, a second plane portion having a second opening in which the light source is arranged, and a second wall portion surrounding the second plane portion. A member is provided with a covering member arranged between the first reflective member and the second reflective member and covering a part of the first wall portion and a part of the second wall portion.

According to the embodiment of the present invention, it is possible to provide a light emitting device capable of suppressing deformation of the frame and a surface light emitting device using the same.

It is an exploded view which shows the whole structure of the light emitting device which concerns on embodiment of this invention. It is sectional drawing which shows a part of the light emitting device and the surface light emitting device which concerns on embodiment of this invention. It is sectional drawing which shows an example of the light source which concerns on embodiment of this invention. It is sectional drawing which shows an example of the light source which concerns on embodiment of this invention. It is sectional drawing which shows an example of the light source which concerns on embodiment of this invention. 6 (A) is a top view showing an example of a reflective member according to an embodiment of the present invention, and FIG. 6 (B) is a sectional view taken along line AA of FIG. 6 (A). It is a top view which shows an example of the reflective member which concerns on embodiment of this invention.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. However, the light emitting device or the surface light source device described below is for embodying the technical idea of the present disclosure, and the present disclosure is not limited to the following unless otherwise specified. Further, the contents described in one embodiment and the embodiment can be applied to other embodiments and the embodiments.

The light emitting device according to the embodiment of the present invention will be described with reference to FIG.
FIG. 1 is an exploded view showing the overall configuration of the light emitting device. The light emitting device according to the embodiment of the present invention includes a substrate 120 on which a plurality of light sources 103 are arranged, a first reflective member 110A, a second reflective member 110B, a first reflective member 110A, and a second reflective member 110B. It has a covering member 200 arranged between them.

The first reflective member 110A includes a plurality of first recesses 102A having a first flat surface portion 106A on which the first opening 104A is formed and a first wall portion 105A surrounding the first opening 104A. Further, the second reflective member 110B, like the first reflective member 110A, has a second recess 102B having a second flat surface portion 106B on which the second opening 104B is formed and a second wall portion 105B surrounding the second opening 104B. It has more than one.

The first reflective member 110A and the second reflective member 110B are arranged on the substrate 120 so that the first opening 104A and the second opening 104B expose each of the plurality of light sources 103 arranged on the substrate 120. .. As shown in FIG. 2, by arranging the light source 103 so as to penetrate the first opening 104A and the second opening 104B from the lower side, the upper surface of the light source 103 is the upper surface of the first flat surface portion 106A and the second flat surface portion 106B. Placed higher than. As a result, the light emitted from the light source 103 can be efficiently reflected by the first wall portion 105A and the second wall portion 105B.

The first opening 104A and the second opening 104B are formed in a substantially circular shape at the substantially center of the first flat surface portion 106A and the second flat surface portion 106B. The shape and size of the opening are the shape and size in which the entire light source 103 is exposed, and the vicinity of the light source 103 so that the light from the light source can be reflected by the first plane portion 106A and the second plane portion 106B. It is preferably formed only in.

As the light source 103, a semiconductor light emitting element such as an LED can be preferably used. The plurality of light sources 103 are arranged on the substrate 120 at predetermined intervals. In FIG. 1, the light sources 103 are arranged in a matrix at equal intervals. Further, the first recess 102A and the second recess 102B are arranged in a matrix. The matrix shape means a state in which the grids are arranged in the X direction (also referred to as the horizontal direction) and the Y direction (also referred to as the vertical direction).

The first reflective member 110A and the second reflective member 110B may be molded using a resin containing a reflective material composed of metal oxide particles such as titanium oxide, aluminum oxide, and silicon oxide, or may not contain the reflective material. After molding with a resin, a reflective material may be provided on the surface. It is preferable that the reflectance with respect to the light emitted from the light source 103 is set to be 70% or more on average in the region of 440 nm to 630 nm.

Examples of the molding method of the first reflective member 110A and the second reflective member 110B include a molding method using a mold and a molding method by stereolithography. As a molding method using a mold, a molding method such as injection molding, extrusion molding, compression molding, vacuum molding, pressure molding, press molding or the like can be applied. For example, by vacuum forming using a reflective sheet formed of PET or the like, a first reflective member 110A in which the first flat surface portion 106A and the first wall portion 105A are integrally formed can be obtained. Similarly, it is also possible to obtain a two-reflection member 110B in which the second flat surface portion 106B and the second wall portion 105B are integrally formed. The thickness of the reflective sheet is, for example, 100 to 300 μm.

The first wall portion 105A and the second wall portion 105B formed so as to surround the light source 103 exposed from the first opening 104A and the second opening 104B refer to the upper surfaces of the first flat surface portion 106A and the second flat surface portion 106B. It is preferable to have a surface inclined so as to spread away in the vertical direction (Z direction in FIG. 2).

In the example shown in FIG. 1, a reflective member is formed by using a plurality of combinations of the first reflective member 110A and the second reflective member 110B on one substrate 120. As shown in FIG. 2, a gap 107 is formed between the first reflective member 110A and the second reflective member 110B. By having the gap 107, even if the first reflective member 110A and the second reflective member 110B expand due to the heat generated from the light source 103, the gap 107 absorbs the expansion in the horizontal direction (X and Y directions). , The deformation of the first reflective member 110A and the second reflective member 110B can be suppressed.

For example, since the first reflective member 110A and the second reflective member 110B are fixed to the substrate 120, the horizontal expansion of the substrate 120 is hindered, and the stress that has lost the refuge causes the first reflective member 110A and the second reflective member 110A and the second. The reflective member 110B floats from the substrate 120 and warps. Such warpage occurs when the substrate 120, the first reflective member 110A, and the second reflective member 110B are arranged in the housing, and the thermally expanded first reflective member 110A and the second reflective member 110B interfere with the housing. Becomes more prominent.

In the example of FIG. 1, six light sources 103 are arranged on one substrate 120 at regular intervals, six in the X direction and four in the Y direction, for a total of 24 light sources. The first reflective member 110A has six first openings 104A corresponding to each light source 103. The second reflective member 110B has six second openings 104B corresponding to each light source 103. In the example of FIG. 1, it has yet another set of the first reflective member 110A and the second reflective member 110B. As described above, the light emitting device may have a plurality of sets of the first reflecting member 110A and the second reflecting member 110B. A covering member 200 is arranged between the adjacent first reflective member 110A and the second reflective member 110B.

As shown in FIG. 2, the lower surfaces of the first flat surface portion 106A and the second flat surface portion 106B and the upper surface of the substrate 120 are fixed by the adhesive member 111. An adhesive member 111 provided around the first opening 104A and the second opening 104B so that the light emitted from the light source 103 does not enter between the substrate 120 and the first reflecting member 110A and the second reflecting member 110B. It is preferable to fix it. For example, it is preferable to arrange the adhesive member 111 in a ring shape along the opening. The adhesive member 111 may be a double-sided tape, a hot-melt type adhesive sheet, or an adhesive liquid of a thermosetting resin or a thermoplastic resin. These adhesive members preferably have high flame retardancy. Further, it may be fixed by screwing instead of an adhesive. It is preferable that the substrate 120 and the first reflective member 110A and the second reflective member 110B are not fixed so that the expansion of the first reflective member 110A and the second reflective member 110B can be absorbed in the vicinity of the gap 107.

As shown in FIG. 2, the covering member 200 is provided so as to cover a part of the gap 107 and the first wall portion 105A and the second wall portion 105B in the vicinity of the gap 107. As a result, it is possible to block the portion where the reflective member does not exist and connect the adjacent first reflective member and the second reflective member, and suppress the decrease in the light extraction efficiency. Therefore, it is preferable that the covering member 200 is made of a member capable of reflecting light, like the first reflecting member 110A and the second reflecting member 110B. Further, it is preferable that all the regions in which the gap 107 is formed are covered with the covering member 200.

The first wall portion 105A and the second wall portion 105B covered with the covering member 200 are lower in height than the other first wall portion and the second wall portion not covered with the covering member 200, or are the first wall. The area of the inclined surface of the portion 105A and the second wall portion 105B is formed to be small. As a result, a gap can be formed at the joint portion between the adjacent first reflective member 110A and the second reflective member 110B.

As shown in FIG. 2, the covering member 200 has a covering surface 201 inclined along the inclined surfaces of the first wall portion 105A and the second wall portion 105B, and the covering surface 201 has the first wall portion 105A and the second wall. The gap 107 is covered by pressing the portion 105B from above.

In a cross-sectional view, the angle θ1 formed by the first wall portion 105A not covered by the covering member 200 and the first plane 106A is the angle formed by the first wall portion 105A covered by the covering member 200 and the first plane 106A. It is preferable to set the angle to be larger than θ2. As a result, when the first reflective member 110A expands or contracts and moves, it can be moved along the inner surface of the covering surface 201. Similarly, for the second reflective member 110B, the angle formed by the second wall portion not covered by the covering member 200 and the second plane is formed between the second wall portion covered by the covering member 200 and the second plane. It is preferable to set the angle to be larger than the angle. Here, the covering surface 201 refers to a surface that covers the first wall portion 105A, the second wall portion 105B, and the gap 107, and is an inner surface portion and the first wall that are in contact with the first wall portion and the second wall portion. It shall include both the portion and the outer surface portion that is connected to the inclined surface of the second wall portion and constitutes the reflective surface.

The covering surface 201 of the covering member 200 is preferably formed in a cross shape in a plan view. The intersection of the crosses of the covering member 200 coincides with the intersection of the top edges of the adjacent wall portions, and the first wall portion and the second wall portion are covered with the covering member 200. A shaft portion 160 and a convex portion 164, which will be described later, may be formed at the intersection of the crosses of the covering member.

Further, a plurality of covering members 200 may be used for a set of the first reflective member 110A and the second reflective member 110B. For example, the adjacent covering members 200 may overlap each other in the X direction or the Y direction at their ends, or may intersect each other in the X direction and the Y direction and overlap each other.

The covering member 200 is preferably fixed to the substrate 120. In the example shown in FIG. 2, the covering member 200 has a shaft portion 160, and a covering surface 201 which is a tapered surface extending from the upper side to the lower side around the shaft portion is provided above the shaft portion 160. It is formed.

As shown in FIG. 2, the shaft portion 160 is inserted into a through hole formed in a substrate 120 and a back chassis 170 or the like arranged under the substrate 120. The shaft portion 160 has a retaining portion 162 having a diameter larger than that of the shaft portion 160. As a result, the shaft portion 160 inserted into the through hole of the substrate 120 and the through hole of the back chassis 170 stops at a predetermined height. By caulking the shaft portion 160 inserted in this way from below, the covering member 200 and the substrate 120 are fixed.

Further, the covering member 200 has a convex portion 164 protruding above the upper surface of the covering surface 201 on the side opposite to the crimped side. The convex portion 164 can function as a support member for supporting a member arranged above the light emitting device. For example, when a diffuser plate for diffusing the light from the light source 103 is arranged, the diffuser plate can be supported by using the plurality of convex portions 164.

The light emitted from the light source 103 is reflected by the outer surfaces of the first wall portion 105A and the second wall portion 105B and the covering surface 201 of the covering member, and is taken out above the light emitting device. The light distribution characteristic of the light source 103 may be any, but in order to illuminate each region surrounded by the first wall portion 105A and the second wall portion with less uneven brightness, a wide light distribution is used. It is preferable to have.

In particular, it is preferable that each of the light sources 103 has a butt wing type light distribution characteristic. As a result, the amount of light emitted in the direction directly above the light source 103 is suppressed, the light distribution of each light source is expanded, and the expanded light is spread to the first plane portion 106A and the second plane portion 106B, and the first wall portion 105A and the first wall portion 105A. By irradiating the two wall portions 105B, it is possible to suppress uneven brightness in each region surrounded by the first wall portion 105A and the second wall portion 105B.

Here, the bat wing type light distribution characteristic is defined by a light emission intensity distribution in which the light emission intensity is strong at an angle where the absolute value of the light distribution angle is larger than 0 °, where the optical axis L is 0 °. As shown in FIG. 3, the optical axis L is defined as a line that passes through the center of the light source 103 and intersects a line on the plane of the substrate 120 perpendicularly.

As the light source 103 having a butt-wing type light distribution characteristic, for example, as shown in FIG. 3, a light source in which a light emitting element 108 having a light reflecting film 122 on the upper surface is covered with a sealing member 124 can be used. The light reflecting film 122 formed on the upper surface of the light emitting element 108 may be a metal film or a dielectric multilayer film (DBR film). As a result, the upward light of the light emitting element 108 is reflected by the light reflecting film 122, the amount of light directly above the light emitting element 108 is suppressed, and a bat wing type light distribution characteristic can be obtained. Since the light reflecting film 122 can be directly formed on the light emitting element 108, the butt wing lens becomes unnecessary, and the thickness of the light source 103 can be reduced.

For example, the height of the light emitting element 108 directly mounted on the substrate 120 is 100 to 500 μm, and the thickness of the light reflecting film 122 is 0.1 to 3.0 μm. The thickness of the light source 103 can be about 0.5 to 2.0 mm even if the sealing member 124 described later is included. The height of the first reflecting member 110A and the second reflecting member 110B combined with such a light source 103 is preferably 8.0 mm or less, and preferably about 1.0 to 4.0 mm in the case of a thinner light emitting device. The distance to the diffuser plate 130 is preferably about 8.0 mm or less, and preferably about 2.0 to 4.0 mm in the case of a thinner light emitting device. As a result, the backlight unit including the optical member such as the diffuser plate 130 can be made extremely thin.

The light reflecting film 122 preferably has a reflectance angle dependence on the incident angle with respect to the emission wavelength of the light emitting element 108. Specifically, the reflectance of the light reflecting film 122 is set to be lower in the oblique incident than in the vertical incident. As a result, the change in brightness directly above the light emitting element becomes gradual, and it is possible to suppress extremely darkening such as a dark spot directly above the light emitting element.

As shown in FIG. 3, the light emitting element 108 is flip-chip mounted via a joining member 128 so as to straddle a pair of positive and negative conductor wirings 126a and 126b provided on the upper surface of the substrate 120. An underfill 136 may be arranged between the lower surface of the light emitting element 108 and the upper surface of the substrate 120. A light reflecting layer 138 such as a white resist may be formed in a region of the conductor wirings 126a and 126b that is not electrically connected.

The sealing member 124 that covers the light emitting element is a translucent member, and is provided so as to cover the light emitting element 108. The sealing member 124 may be in direct contact with the substrate 120. The sealing member 124 is adjusted to a viscosity that allows printing and dispensing with a dispenser, and can be cured by heat treatment or irradiation with light. The shape of the sealing member 124 includes, for example, a substantially hemispherical shape, a vertically long convex shape in a cross-sectional view (a shape in which the length in the Z direction is longer than the length in the X direction in the cross-sectional view), and a flat shape (cross-sectional view). It may be formed to have a convex shape (a shape in which the length in the X direction is longer than the length in the Z direction) in view, and a circular shape or an elliptical shape in view from above.

The light source 103 for obtaining the bat wing type light distribution characteristic is not limited to the above-mentioned structure. For example, as shown in FIG. 4, a light reflecting film 122 is provided on the upper surface of the sealing member 124 that covers the light emitting element 108, and the side surface of the sealing member 124 is exposed from the light reflecting film 122 to extract light in the lateral direction. It may be a structure. The light emitting element 108 may be mounted on the upper surface of the support 140, or may have an external electrode on the lower surface of the support 140. Even in the light source 103 shown in FIG. 4, the upward light of the light emitting element 108 is reflected by the light reflecting film 122, the amount of light directly above the light emitting element 108 is suppressed, and the light distribution characteristic of the butt wing type is obtained. Can be done.

Further, as a light source 103 for obtaining a butt wing type light distribution characteristic, a lens 142 that covers the light emitting element 108 may be provided as shown in FIG. The lens 142 has a columnar outer shape, and has a recess 148 in which a light emitting element 108 is arranged substantially in the center of the bottom surface of the lens.

Further, the surface facing the bottom surface of the lens has a recess 150 substantially in the center, and a curved surface having a convex shape on the side facing the substrate 120 from the center side to the outside is formed. The light emitting element 108 may be a light emitting device mounted on a support and covered with a covering member. Even in the light source 103 shown in FIG. 5, the upward light of the light emitting element 108 is reflected laterally on the inner surface of the concave portion 150 and emitted from the convex curved surface, so that the amount of light directly above the light emitting element 108 is emitted. Is suppressed, and a bat wing type light distribution characteristic can be obtained.

In the above example, a light source 103 is used as a light source 103 by using one light emitting element 108 for each region partitioned by the first wall portion and the second wall portion, but a plurality of light emitting elements 108 are used. It may be one light source 103.

The shape of the flat surface portion 106 is preferably polygonal. This makes it easy to divide the light emitting surface into an arbitrary number by the first wall portion 105A and the second wall portion 105B according to the area of the light emitting surface. Examples of the shapes of the first flat surface portion 106A and the second flat surface portion 106B include a square and a rectangle as shown in FIG. 6, and a hexagon as shown in FIG. 7. When the shape of the flat surface portion 106 is hexagonal, the arrangement of the first reflective member 110A and the second flat surface portion 106B is a honeycomb-like arrangement as shown in FIG. 7. In the case of a honeycomb-like arrangement, the light sources 103 are arranged in a staggered pattern. Although FIGS. 6 and 7 show an example of the first reflective member 110A, the second reflective member 110B can be formed in the same manner.

The number of divisions of the area divided by the first wall portion and the second wall portion can be arbitrarily set, and the position of the light source and the shapes of the first wall portion and the second wall portion are changed according to the desired size. can do.

(Surface light emitting device)
A case where the light emitting device described above is used as a light source for a direct backlight will be described. As shown in FIG. 2, an optical member such as a diffuser plate 130 or a prism sheet is arranged above the light emitting device at a predetermined distance, and a liquid crystal panel 132 is further arranged on the diffuser plate 130 to form a surface light emitting device.

The light source for the backlight can be made thinner by optimizing the shapes of the first reflecting member 110A and the second reflecting member 110B, but after fixing the area divided by the first wall portion and the second wall portion. For example, the brightness uniformity can be satisfied even when the light source pitch (P) and the distance (H) from the light source mounting surface to the optical member arranged in the L direction of the optical axis are about P / H = 5.2. It is assumed that the light reflection member is optimized. By doing so, the brightness uniformity can be maintained up to about P / H = 3.3, so that it can be used for various backlights simply by increasing or decreasing the number of divisions according to the desired screen size and desired P / H. A light source can be provided. The control area for local dimming, which will be described later, can also be dealt with by selecting one or two division units to be controlled. As a result, the division area can be changed according to the desired screen size, and the trouble of optimizing the light reflecting member each time can be omitted, so that the cost can be reduced.

Each light source 103 arranged on the substrate 120 can be driven independently of each other, and dimming control (for example, local dimming or HDR) for each light source is possible. Since each light source 103 is surrounded by the first wall portion 105A and the second wall portion 105B, it is possible to suppress the light emitted from the adjacent light source from entering the adjacent region across the wall portion. Can be done. For example, when only one area surrounded by the first wall portion 105A is turned off, the brightness does not decrease when the light of the adjacent area is incident, and even when black is displayed on the display device, it becomes whitish black. The brightness can be reduced by suppressing the incident of unnecessary light. Further, even when it is desired to increase the brightness in only one region, it is possible to increase the brightness in only one region while suppressing the incident of light in the adjacent region.

Hereinafter, materials and the like suitable for each component of the light emitting device of the embodiment will be described.
(substrate)
The substrate 120 is a member for mounting the light source 103, and has conductor wirings 126a and 126b for supplying electric power to the light source such as the light emitting element 108 as shown in FIG.

The material of the substrate may be any material that can insulate and separate at least a pair of conductor wirings 126a and 126b. Examples thereof include resins such as ceramics, phenol resin, epoxy resin, polyimide resin, BT resin, polyphthalamide (PPA), and polyethylene terephthalate (PET). A so-called metal substrate having an insulating layer formed on the metal member may be used.

The thickness of the substrate can be appropriately selected, and it may be either a flexible substrate that can be manufactured by a roll-to-roll method or a rigid substrate. The rigid substrate may be a bendable thin rigid substrate.

(Joining member)
The joining member is a member for fixing the light emitting element 108 to the substrate or the conductor wiring. Examples thereof include an insulating resin and a conductive member, and in the case of flip-chip mounting as shown in FIG. 3, the conductive member is used. Specifically, Au-containing alloys, Ag-containing alloys, Pd-containing alloys, In-containing alloys, Pb-Pd-containing alloys, Au-Ga-containing alloys, Au-Sn-containing alloys, Sn-containing alloys, Sn-Cu-containing alloys, Sn- Examples thereof include Cu—Ag-containing alloys, Au—Ge-containing alloys, Au—Si-containing alloys, Al-containing alloys, Cu—In-containing alloys, and mixtures of metals and fluxes.

(Light reflecting layer)
It is preferable that the conductor wiring is covered with the light reflecting layer 138 except for the portion electrically connected to the light emitting element 108 and other materials. That is, as shown in FIG. 3, a resist for insulatingly covering the conductor wiring may be arranged on the substrate 120, and the light reflecting layer 138 can function as a resist. By containing a white filler in the resin material described later, it is possible to prevent light leakage and absorption and improve the light extraction efficiency of the light emitting device.

(Light emitting element)
As the light emitting element 108, a known one can be used. For example, it is preferable to use a light emitting diode as the light emitting element 108.
As the light emitting element 108, one having an arbitrary wavelength can be selected. For example, as the blue and green light emitting devices, those using a nitride semiconductor can be used. Further, as the red light emitting element, GaAlAs, AlInGaP and the like can be used. Further, a semiconductor light emitting device made of a material other than this can also be used. The composition, emission color, size, number, etc. of the light emitting element to be used can be appropriately selected according to the purpose.

(Sealing member)
The sealing member 124 may be arranged so as to cover the light emitting element for the purpose of protecting the light emitting element from the external environment and optically controlling the light output from the light emitting element. As the material of the sealing member, a translucent resin such as an epoxy resin, a silicone resin, or a resin in which they are mixed, glass, or the like can be used. Of these, it is preferable to select a silicone resin in consideration of light resistance and ease of molding.

Further, the sealing member is used for a wavelength conversion material such as a phosphor that absorbs light from the light emitting element and emits light having a wavelength different from the output light from the light emitting element, and for diffusing the light from the light emitting element. A diffusing agent can be contained. Further, a colorant may be contained in accordance with the emission color of the light emitting element.

The light emitting device and the surface light emitting device of the present invention can be used for various light emitting devices such as a light source for a backlight of a display device and a light source of a lighting device.

120 Substrate 103 Light source 102A 1st concave part 104A 1st opening 105A 1st wall part 106A 1st flat part 102B 2nd concave part 104B 2nd opening 105B 2nd wall part 106B 2nd flat part 108 Light emitting element 110A 1st reflective member 110B 1st 2 Reflective member 111 Adhesive member 122 Light reflective film 124 Sealing member 126a, 126b Conductor wiring 130 Diffusing plate 132 Liquid crystal panel 136 Underfill 138 Light reflecting layer 140 Support 142 Lens 200 Covering member 201 Covering surface 160 Shaft part 162 Retaining part 164 Convex 170 Back chassis

Claims (10)

A board with multiple light sources and
A first reflective member having a plurality of first recesses having a first flat surface portion having a first opening in which the light source is arranged and a first wall portion surrounding the first flat surface portion is provided.
The light source is
With the support,
The light emitting element on the upper surface of the support and
A sealing member that covers the light emitting element, has a light reflecting film on the upper surface, and has side surfaces exposed from the light reflecting film.
The light reflecting film is a dielectric reflecting film, and the light reflecting film is a dielectric reflecting film.
The reflectance of the light reflecting film has a reflectance angle dependence with respect to the incident angle with respect to the emission wavelength of the light emitting element, and is set so that the oblique incident is lower than the vertical incident. Light emitting device. The light emitting device according to claim 1, wherein the upper surface of the substrate and the lower surface of the first flat surface portion are fixed. The light emitting device according to claim 1 or 2, wherein the first wall portion is arranged so as to be inclined with respect to the upper surface of the first flat surface portion. The light emitting device according to any one of claims 1 to 3, wherein the first recess is arranged in a matrix. The light emitting device according to any one of claims 1 to 4, wherein the sealing member includes a wavelength conversion material that emits light having a wavelength different from that of the output light from the light emitting element. The light emitting device according to any one of claims 1 to 5, wherein the sealing member contains a diffusing agent that diffuses light from the light emitting element. Unlike the first reflective member,
Any of claims 1 to 6, comprising a second reflective member having a plurality of second recesses having a second flat surface portion having a second opening in which the light source is arranged and a second wall portion surrounding the second flat surface portion. The light emitting device according to item 1. The light emitting device according to claim 7, wherein the first reflecting member and the second reflecting member are adjacent to each other, and a gap is provided between the adjacent first reflecting member and the second reflecting member. 8. Claim 8 in which a covering member covering a part of the first wall portion and a part of the second wall portion is arranged between the adjacent first reflecting member and the second reflecting member. The light emitting device according to. The light emitting device according to claim 9, which has a convex portion on the upper portion of the covering member.
A surface light emitting device having a diffuser plate supported by the convex portion.

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