JP6631318B2 - 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.

2. Description of the Related Art As a direct type backlight used for a liquid crystal television or the like, for example, a surface emitting device as disclosed in Patent Document 1 is known.
The light emitting device disclosed in Patent Literature 1 has peripheral walls around a plurality of light sources, and has frames arranged in a matrix. This makes it possible to perform local dimming by controlling the amount of light emission for each light source and increasing the contrast ratio in a plurality of areas, while dividing the light emitting area to prevent light leakage outside the area.

JP 2013-25945 A

  However, there is a possibility that the frame body expands due to heat generated from the light source and the frame body is deformed.

  An embodiment according to 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 includes 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 first reflection member including a plurality of recesses, a second reflection including a plurality of second recesses including a second plane portion having a second opening in which the light source is disposed and a second wall surrounding the second plane portion. A member, and a covering member disposed between the first reflection member and the second reflection member to cover a part of the first wall and a part of the second wall.

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

FIG. 1 is an exploded view showing an overall configuration of a light emitting device according to an embodiment of the present invention. It is sectional drawing which shows a part of light emitting device and surface light emitting device which concern on embodiment of this invention. FIG. 1 is a cross-sectional view illustrating an example of a light source according to an embodiment of the present invention. FIG. 1 is a cross-sectional view illustrating an example of a light source according to an embodiment of the present invention. FIG. 1 is a cross-sectional view illustrating an example of a light source according to an embodiment of the present invention. FIG. 6A is a top view illustrating an example of the reflecting member according to the embodiment of the present invention, and FIG. 6B is a cross-sectional view taken along line AA of FIG. 6A. FIG. 3 is a top view illustrating an example of a reflection member according to the embodiment of the present 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, what is described in one embodiment or example can be applied to other embodiments or examples.

A light emitting device according to an embodiment of the present invention will be described with reference to FIG.
FIG. 1 is an exploded view showing the entire 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 reflecting member 110A, a second reflecting member 110B, and a first reflecting member 110A and a second reflecting member 110B. It has a covering member 200 disposed therebetween.

  The first reflecting member 110A includes a plurality of first concave portions 102A having a first flat portion 106A in which the first openings 104A are formed and a first wall portion 105A surrounding the first openings 104A. Similarly to the first reflecting member 110A, the second reflecting member 110B includes a second concave portion 102B having a second plane portion 106B in which the second opening 104B is formed and a second wall portion 105B surrounding the second opening 104B. Have multiple.

  The first reflection member 110A and the second reflection member 110B are arranged on the substrate 120 such 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 disposing the light source 103 so as to penetrate the first opening 104A and the second opening 104B from below, the upper surface of the light source 103 becomes the upper surfaces of the first flat portion 106A and the second flat portion 106B. Higher than that. Thereby, 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 substantially at the center of the first flat portion 106A and the second flat portion 106B. The shape and size of the opening are such that the entire light source 103 is exposed, and are near the light source 103 so that light from the light source 103 can be reflected by the first flat portion 106A and the second flat portion 106B. Preferably, it is formed only.

  As the light source 103, a semiconductor light emitting element such as an LED can be suitably 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 at equal intervals in a matrix. Further, the first recess 102A and the second recess 102B are arranged in a matrix. Note that the matrix shape refers to a state where the elements are arranged in a grid in the X direction (also referred to as a horizontal direction) and the Y direction (also referred to as a vertical direction).

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

  As a forming method of the first reflecting member 110A and the second reflecting member 110B, a forming method using a mold or a forming method by stereolithography is exemplified. As a molding method using a mold, molding methods such as injection molding, extrusion molding, compression molding, vacuum molding, air pressure molding, and press molding can be applied. For example, by performing vacuum forming using a reflection sheet made of PET or the like, it is possible to obtain a first reflection member 110A in which the first plane portion 106A and the first wall portion 105A are integrally formed. Similarly, a two-reflection member 110B in which the second flat portion 106B and the second wall portion 105B are integrally formed can be obtained. The thickness of the reflection 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 are formed with respect to the upper surfaces of the first flat portion 106A and the second flat portion 106B. It is preferable to have a surface that is inclined so as to become wider as the distance increases in the vertical direction (Z direction in FIG. 2).

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

  For example, since the first reflection member 110A and the second reflection member 110B are fixed to the substrate 120, expansion of the substrate 120 in the horizontal direction is hindered, and the first reflection member 110A and second The reflecting member 110B warps so as to float from the substrate 120. Such a warp occurs when the substrate 120, the first reflection member 110A, and the second reflection member 110B are arranged in the housing, and the first reflection member 110A and the second reflection member 110B that have thermally expanded interfere with the housing. Becomes more noticeable.

  In the example of FIG. 1, six light sources 103 are arranged on one substrate 120 in the X direction and four light sources 103 in the Y direction, for a total of 24 light sources 103, and are arranged at regular intervals. The first reflecting member 110A has six first openings 104A corresponding to the respective light sources 103. The second reflecting member 110B has six second openings 104B corresponding to the respective light sources 103. Note that the example of FIG. 1 further includes another pair of the first reflection member 110A and the second reflection member 110B. As described above, the light emitting device may include a plurality of sets of the first reflecting member 110A and the second reflecting member 110B. The covering member 200 is disposed between the adjacent first reflection member 110A and second reflection member 110B.

  As shown in FIG. 2, the lower surfaces of the first flat portion 106A and the second flat portion 106B and the upper surface of the substrate 120 are fixed by an adhesive member 111. An adhesive member 111 provided around the first opening 104A and the second opening 104B so that 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. 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 adhesive sheet, or an adhesive liquid of a thermosetting resin or a thermoplastic resin. These adhesive members preferably have high flame retardancy. Further, instead of using an adhesive, it may be fixed with screws. In the vicinity of the gap 107, it is preferable that the substrate 120 and the first and second reflecting members 110A and 110B are not fixed so that the expansion of the first and second reflecting members 110A and 110B can be absorbed.

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

  The first wall portion 105A and the second wall portion 105B that are covered with the covering member 200 are lower in height than the other first and second wall portions that are not covered with the covering member 200, or the first wall portion is not covered with the covering member 200. The areas of the inclined surfaces of the portion 105A and the second wall portion 105B are formed to be small. Thereby, a gap can be formed at the joint between the adjacent first reflection member 110A and second reflection member 110B.

  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 as shown in FIG. 2, and the covering surface 201 includes the first wall portion 105A and the second wall portion 105A. The gap 107 is covered by pressing the portion 105B from above.

  In a cross-sectional view, the angle θ1 between the first wall portion 105A not covered with the covering member 200 and the first plane 106A is the angle between the first wall portion 105A covered with the covering member 200 and the first plane 106A. It is preferable to set the angle to be larger than θ2. Thereby, when the first reflecting member 110A moves by expanding or contracting, it can be moved along the inner surface of the covering surface 201. Similarly, for the second reflection member 110B, the angle between the second wall not covered by the covering member 200 and the second plane is defined by the angle between the second wall covered by the covering member 200 and the second plane. Preferably, the angle is set to be larger than the angle. Here, the covering surface 201 refers to a surface covering the first wall portion 105A, the second wall portion 105B, and the gap 107, and an inner surface portion in contact with the first wall portion and the second wall portion and the first wall portion. It includes both the outer surface portion that forms the reflection surface by being connected to the inclined surface of the portion and the second wall portion.

  The covering surface 201 of the covering member 200 is preferably formed in a cross shape in a plan view. The intersection of the cross of the covering member 200 and the intersection of the top sides of the adjacent walls are made to coincide with each other, and the first wall and the second wall are covered with the covering member 200. A shaft 160 and a convex 164, which will be described later, may be formed at the intersections of the crosses of the covering member.

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

  The covering member 200 is preferably fixed to the substrate 120. In the example illustrated in FIG. 2, the covering member 200 includes the shaft 160, and a covering surface 201 that is a tapered surface that extends from above to below the shaft around the shaft 160 above the shaft 160. Is formed.

  As shown in FIG. 2, the shaft 160 is inserted into a through hole formed in the substrate 120 and the back chassis 170 disposed below the substrate 120. The shaft portion 160 has a retaining portion 162 having a larger diameter than the shaft portion 160. Thus, the shaft 160 inserted into the through hole of the substrate 120 and the through hole of the back chassis 170 stops at a predetermined height. The covering member 200 and the substrate 120 are fixed by caulking the inserted shaft portion 160 from below.

  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 side on which the caulking is performed. The projection 164 can function as a support member that supports a member disposed above the light emitting device. For example, in the case where a diffusion plate for diffusing light from the light source 103 is provided, the diffusion plate can be supported using the plurality of convex portions 164.

  Light emitted from the light source 103 is reflected by the first wall portion 105A and the second wall portion 105B and the outer surface of the covering surface 201 of the covering member, and is extracted above the light emitting device. The light distribution characteristic of the light source 103 may be any. However, in order to illuminate each area surrounded by the first wall 105A and the second wall with less uneven brightness, a wide light distribution is used. Preferably, there is.

  In particular, it is preferable that each of the light sources 103 has a bat wing type light distribution characteristic. This suppresses the amount of light emitted directly above the light source 103, widens the light distribution of each light source, and spreads the spread light 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 of the regions surrounded by the first wall portion 105A and the second wall portion 105B.

  Here, the light distribution characteristics of the bat wing type are 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 greater than 0 °, with the optical axis L being 0 °. The optical axis L is defined as a line passing through the center of the light source 103 and perpendicularly intersecting with a line on the plane of the substrate 120 as shown in FIG.

  As the light source 103 having a bat 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 an upper surface is covered with a sealing member 124 can be used. The light reflection 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). Accordingly, light in the upward direction of the light emitting element 108 is reflected by the light reflecting film 122, and the amount of light immediately above the light emitting element 108 is suppressed, so that a batwing type light distribution characteristic can be obtained. Since the light reflecting film 122 can be formed directly on the light emitting element 108, a bat wing lens is not required, 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 reflection film 122 is 0.1 to 3.0 μm. Even if a sealing member 124 described later is included, the thickness of the light source 103 can be about 0.5 to 2.0 mm. The height of the first reflection member 110A and the second reflection member 110B combined with such a light source 103 is preferably 8.0 mm or less, and is preferably about 1.0 to 4.0 mm for a thinner light emitting device. The distance to the diffusion plate 130 is preferably about 8.0 mm or less, and in the case of a thinner light emitting device, it is preferably about 2.0 to 4.0 mm. Thereby, the backlight unit including the optical member such as the diffusion plate 130 can be made extremely thin.

  It is preferable that the light reflection film 122 has a reflectance angle dependency on an incident angle with respect to a light emission wavelength of the light emitting element 108. Specifically, the reflectivity of the light reflecting film 122 is set so that oblique incidence is lower than vertical incidence. This makes it possible to suppress an extremely dark change, such as a gradual change in luminance immediately above the light emitting element and a dark point immediately above the light emitting element.

  As shown in FIG. 3, the light emitting element 108 is flip-chip mounted via a bonding 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 provided 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 where no electrical connection is made.

  The sealing member 124 that covers the light-emitting element is a light-transmitting 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 or dispenser application, and can be cured by heat treatment or light irradiation. Examples of the shape of the sealing member 124 include a substantially hemispherical shape, a vertically long convex shape in a cross-sectional view (a shape in the Z direction longer than the X-direction length in the cross-sectional view), and a flat shape (cross-sectional view) in the cross-sectional view. It may be formed so as to have a convex shape having a shape in which the length in the X direction is longer than the length in the Z direction when viewed), or a circular shape or an elliptical shape when viewed from above.

  The light source 103 for obtaining the bat wing type light distribution characteristic is not limited to the above-described structure. For example, as shown in FIG. 4, a light reflecting film 122 is provided on an upper surface of a sealing member 124 that covers the light emitting element 108, and light is laterally extracted by exposing a side surface of the sealing member 124 from the light reflecting film 122. 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 illustrated in FIG. 4, light in the upward direction of the light-emitting element 108 is reflected by the light reflection film 122, and the light amount immediately above the light-emitting element 108 is suppressed, so that a batwing type light distribution characteristic is obtained. Can be.

  In addition, as shown in FIG. 5, a lens 142 that covers the light emitting element 108 may be provided as the light source 103 for obtaining a bat wing type light distribution characteristic. The lens 142 has a columnar outer shape, and has a concave portion 148 in which the light emitting element 108 is disposed substantially at the center of the bottom surface of the lens.

  Further, the surface facing the lens bottom surface has a concave portion 150 at substantially 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. Note that 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 light amount immediately above the light emitting element 108 is obtained. And light distribution characteristics of a bat wing type can be obtained.

  In the above example, one light-emitting element 108 is used as the light source 103 for each area partitioned by the first wall and the second wall. However, a plurality of light-emitting elements 108 are used. One light source 103 may be used.

  The shape of the flat part 106 is preferably a polygon. 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. The shape of the first flat portion 106A and the second flat portion 106B is, for example, a square or a rectangle as shown in FIG. 6, or a hexagon as shown in FIG. When the shape of the flat portion 106 is hexagonal, the arrangement of the first reflecting member 110A and the second flat portion 106B is a honeycomb-shaped array as shown in FIG. In the case of a honeycomb arrangement, the light sources 103 are arranged in a staggered manner. FIGS. 6 and 7 show an example of the first reflecting member 110A, but the second reflecting member 110B can be formed similarly.

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

(Surface emitting device)
The case where the above-described light emitting device is used as a direct type backlight light source will be described. As shown in FIG. 2, an optical member such as a diffusion plate 130 or a prism sheet is disposed above the light emitting device at a predetermined distance, and a liquid crystal panel 132 is further disposed thereon to obtain a surface light emitting device.

  By optimizing the shapes of the first reflecting member 110A and the second reflecting member 110B, the backlight light source can be made thinner, 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 if the light source pitch (P) and the distance (H) from the light source mounting surface to the optical member arranged in the optical axis L direction are about P / H = 5.2. Suppose that the light reflecting member is optimized. By doing so, the brightness uniformity can be maintained up to about P / H = 3.3, so that various backlights can be obtained simply by increasing or decreasing the number of sections according to a desired screen size and a desired P / H. A light source can be provided. A local dimming control area, which will be described later, can be handled by selecting one or two division units to be controlled. As a result, it is possible to omit the trouble of changing the divided area depending on the desired screen size and optimizing the light reflecting member each time, thereby achieving cost reduction.

  The light sources 103 arranged on the substrate 120 can be driven independently of each other, and can perform dimming control (for example, local dimming or HDR) for each light source. Since each light source 103 is surrounded by the first wall portion 105A and the second wall portion 105B, it is possible to suppress light emitted from the adjacent light source from entering the adjacent region across the wall portion. Can be. For example, when only one region surrounded by the first wall portion 105A is turned off, the brightness does not decrease when light in an adjacent region is incident, and the display device becomes whitish black even when displaying black. By suppressing the incidence of unnecessary light, luminance can be reduced. Also, when it is desired to increase the luminance only in one region, it is possible to increase the luminance only in one region while suppressing the incidence of light on an 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 on which the light source 103 is mounted, and has conductor wirings 126a and 126b for supplying power to the light source such as the light emitting element 108, as shown in FIG.

  The substrate may be made of any material that can insulate and separate at least the pair of conductor wires 126a and 126b. For example, resins such as ceramics, phenolic resin, epoxy resin, polyimide resin, BT resin, polyphthalamide (PPA), and polyethylene terephthalate (PET) can be used. A so-called metal substrate in which an insulating layer is formed on a metal member may be used.

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

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

(Light reflection layer)
It is preferable that the conductor wiring is covered with the light reflection layer 138 except for a portion electrically connected to the light emitting element 108 or another material. 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 reflection layer 138 can function as a resist. By including a white filler in a resin material described later, light leakage and absorption can be prevented, and the light extraction efficiency of the light emitting device can be improved.

(Light emitting element)
As the light emitting element 108, a known light emitting element can be used. For example, it is preferable to use a light emitting diode as the light emitting element 108.
The light-emitting element 108 can have an arbitrary wavelength. For example, as a blue or green light-emitting element, an element using a nitride-based semiconductor can be used. As the red light emitting element, GaAlAs, AlInGaP, or the like can be used. Furthermore, a semiconductor light emitting device made of other materials can be used. The composition, emission color, size, number, and the like of the light-emitting elements to be used can be appropriately selected depending on the purpose.

(Sealing member)
For the purpose of protecting the light emitting element from the external environment and optically controlling the light output from the light emitting element, the sealing member 124 may be provided so as to cover the light emitting element. As a material of the sealing member, a translucent resin such as an epoxy resin, a silicone resin, or a resin obtained by mixing them, glass, or the like can be used. Among these, it is preferable to select a silicone resin in consideration of light resistance and ease of molding.

  Further, the sealing member has 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 a light emitting element for diffusing light from the light emitting element. A diffusing agent can be included. Further, a coloring agent can 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 backlight light source of a display device and a light source of a lighting device.

120 substrate 103 light source 102A first concave portion 104A first opening 105A first wall portion 106A first flat portion 102B second concave portion 104B second opening 105B second wall portion 106B second flat portion 108 light emitting element 110A first reflecting member 110B first 2 Reflecting member 111 Adhesive member 122 Light reflecting film 124 Sealing member 126a, 126b Conductor wiring 130 Diffusion plate 132 Liquid crystal panel 136 Underfill 138 Light reflecting layer 140 Support 142 Lens 200 Covering member 201 Covering surface 160 Shaft 162 164 convex 170 back chassis

Claims (10)

A substrate on which a plurality of light sources are arranged,
A first reflecting member including a plurality of first concave portions having a first flat portion having a first opening in which the light source is disposed, and a first wall surrounding the first flat portion;
A second reflecting member including a plurality of second concave portions having a second flat portion having a second opening in which the light source is disposed and a second wall surrounding the second flat portion;
A light emitting device comprising: a covering member disposed between the first reflecting member and the second reflecting member, and covering a part of the first wall and a part of the second wall.   The light emitting device according to claim 1, wherein an upper surface of the substrate and lower surfaces of the first plane portion and the second plane portion are fixed.   The light emitting device according to claim 1, wherein the first wall portion and the second wall portion are inclined with respect to upper surfaces of the first plane portion and the second plane portion.   The light emitting device according to any one of claims 1 to 3, wherein the covering member has a covering surface that is arranged to be inclined with respect to upper surfaces of the first plane portion and the second plane portion.   A part of the first wall and the second wall covered by the covering member is higher in height than other parts of the first wall and the second wall not covered by the covering member. The light emitting device according to any one of claims 1 to 4, wherein   The light emitting device according to claim 1, wherein the light source includes a light emitting element and a light reflecting film formed on an upper surface of the light emitting element.   The light emitting device according to claim 1, wherein the first concave portion and the second concave portion are arranged in a matrix.   The light emitting device according to claim 1, wherein the first recess and the second recess are arranged in a honeycomb shape.   The light emitting device according to any one of claims 1 to 8, wherein the light emitting device has a protrusion on an upper portion of the covering member. A light-emitting device according to claim 9, and a diffusion plate,
The surface light emitting device, wherein the diffusion plate is supported by the protrusion.

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