JP2020126847A - Light emitting device - Google Patents

Abstract

To provide a surface light emitting device that can be improved in contrast ratio between a lighting area and a non-lighting area.SOLUTION: The present invention relates to a light emitting device that has: a substrate which has a plurality of light sources arranged; a section member which comprises a plurality of regions formed of a wall part surrounding the respective light sources, having a top part, and tilting to spread from a lower part to an upper part; a diffusion plate provided over the section member and coming into direct or indirect contact with the top part; a plurality of first reflection parts which are provided right above the light sources on a top surface or reverse surface of the diffusion plate; and a second reflection part which is provided right above the top part on the top surface or reverse surface of the diffusion plate. The light sources each have a light emitting element and a sealing member covering the light emitting element.SELECTED DRAWING: Figure 1A

Description

The present disclosure relates to a light emitting device.

As a direct type backlight used in 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 Document 1 has a peripheral wall around a plurality of light sources, and has a frame body arranged in a matrix. This allows local dimming (also called partial drive) that divides the light emitting area to prevent light from leaking out of the area and controls the amount of light emission for each light source to increase the contrast ratio in multiple areas. I am trying.

JP, 2013-25945, A

However, when the light source is locally dimmed by such a surface emitting device, the light emitted from the light source in the lighting area and scattered and guided by the diffusion plate or the like is incident on the non-lighting area adjacent to the lighting area, and The contrast ratio between the lighting area and the lighting area decreases.

The embodiment according to the present invention has been made in view of such circumstances, and provides a surface emitting device capable of improving the contrast ratio between the lighting area and the non-lighting area.

A light-emitting device according to an embodiment of the present invention includes a substrate on which a plurality of light sources are arranged, a partition member that surrounds each of the light sources, and includes a plurality of regions formed by a wall portion having a top, and the partition member. A diffuser plate provided directly on or in contact with the top portion, a plurality of first reflecting portions provided on the upper surface or the lower surface of the diffuser plate immediately above the light source, and an upper surface of the diffuser plate. Or a second reflecting portion provided on the lower surface and directly above the top portion.

According to the light emitting device of one embodiment of the present invention, there is provided a surface emitting device capable of improving the contrast ratio between the lighting area and the non-lighting area.

It is a schematic sectional drawing of the light-emitting device which concerns on 1st Embodiment of this invention. It is a schematic sectional drawing of the light-emitting device which concerns on the modification of 1st Embodiment of this invention. It is a schematic sectional drawing of the light-emitting device which concerns on another modification of 1st Embodiment of this invention. It is a schematic sectional drawing of the light-emitting device which concerns on the further another modified example of 1st Embodiment of this invention. It is a schematic sectional drawing of the light-emitting device which concerns on the further another modified example of 1st Embodiment of this invention. It is a schematic top view which shows a part of light-emitting device which concerns on 1st Embodiment of this invention. It is a schematic sectional drawing which shows an example of the light source which concerns on embodiment of this invention. It is a schematic diagram showing an example of a reflection pattern of a diffusion plate concerning a 1st embodiment of the present invention. It is a schematic diagram showing an example of a reflection pattern of a diffusion plate concerning a 1st embodiment of the present invention. It is a schematic diagram showing an example of a reflection pattern of a diffuser plate concerning a 2nd embodiment of the present invention. It is a schematic diagram showing an example of a reflection pattern of a diffuser plate concerning a 2nd embodiment of the present invention. It is a schematic diagram showing an example of a reflection pattern of a diffuser plate concerning a 3rd embodiment of the present invention. It is a figure for demonstrating the effect of embodiment which concerns on this invention. It is a figure for demonstrating the effect of embodiment which concerns on this invention.

<First Embodiment>
A light emitting device according to an embodiment of the present invention will be described with reference to FIG. 1A.
FIG. 1A is a schematic sectional view showing the overall configuration of a light emitting device. The light emitting device according to the embodiment of the present invention surrounds each of the substrate 120 on which the plurality of light sources 103 are arranged and the light source 103,
A partitioning member 110 having a plurality of regions formed by the wall 110A having a top 110B, a diffusion plate 130 provided on the partitioning member 110 and directly or indirectly in contact with the top, and an upper surface or a lower surface of the diffusion plate 130. And the plurality of first reflectors 10 provided directly above the light source 103.
2 and the second reflecting portion 104 provided on the top surface or the bottom surface of the diffusion plate 130 and directly above the top portion 110B.

In the present specification, the term "light source" refers to a member that emits light, and includes, for example, not only a light emitting element itself that emits light, but also a light emitting element sealed with a translucent resin or the like, or packaging. Surface mounted light emitting device (also referred to as an LED). For example, in the present embodiment, the light emitting element 108 covered with the sealing member 124 is used as the light source 103.

FIG. 2 shows a schematic top view of the light emitting device with the diffusion plate 130 removed. In this embodiment,
A total of 25 light sources 103 are arranged in a matrix, five in the X direction and five in the Y direction.
The partition member 110 arranged on the substrate 120 divides the area into a plurality of areas having a substantially square shape in a top view, and the light source 103 is arranged at the substantially center of each of the divided areas.

The partition member 110 has light reflectivity, and allows the light emitted from the light source 103 to pass through the wall 110A.
Can be reflected efficiently. In the present embodiment, the partition member 110 has a bottom surface 110C and a wall portion 110A having a top portion 110B. The partitioning member 110 has a concave portion formed by a bottom surface 110C and a wall portion 110A, and has a through hole 110D at a substantially central portion of the bottom surface 110C. As shown in FIG. 1A, by arranging the light source 103 so as to penetrate the through hole of the bottom surface 110C from below, the top surface of the light source 103 is arranged above the bottom surface 110C. Thereby, the light emitted from the light source 103 can be efficiently reflected by the wall 110A.

The shape and size of the through hole may be any shape and size with which the entire light source 103 is exposed. Further, it is preferable that the outer edge of the through hole is formed so as to be located only near the light source 103 so that the light from the light source can be reflected by the bottom surface 110C.

The partition member 110 may be molded using a resin containing a reflecting material composed of metal oxide particles such as titanium oxide, aluminum oxide, and silicon oxide, or after molding using a resin containing no reflecting material, A reflective material may be provided on the surface. It is preferable to set the reflectance for the light emitted from the light source 103 to be 70% or more.

Examples of the method of molding the partition member 110 include a molding method using a mold and a molding method by stereolithography. As a molding method using a mold, molding methods such as injection molding, extrusion molding, compression molding, vacuum molding, pressure molding, and press molding can be applied. For example, by vacuum forming using a reflection sheet formed of PET or the like, it is possible to obtain the partition member 110 in which the bottom surface 110C and the wall portion 110A are integrally formed. The thickness of the reflection sheet is, for example, 100 to 300.
μm.

The wall portion 110A formed to surround the light source 103 includes a bottom surface 110C and a substrate 120.
It is preferable to have a surface inclined so as to spread from the lower part to the upper part with respect to the upper surface.

The lower surface of the bottom surface 110C of the partition member 110 and the upper surface of the substrate 120 are fixed with an adhesive member or the like. Light emitted from the light source 103 is prevented from entering between the substrate 120 and the partition member 110.
It is preferable to fix the periphery of the through hole with an adhesive member. For example, it is preferable to arrange the adhesive member in a ring shape along the outer edge of the through hole. The adhesive member may be a double-sided tape, a hot-melt type adhesive sheet, or a thermosetting resin or thermoplastic resin adhesive liquid. It is preferable that these adhesive members have high flame retardancy. Further, it may be fixed by screwing instead of an adhesive.

The light emitted from the light source 103 is reflected by the wall portion 110A and the bottom surface 110C and is incident on the diffusion plate 130 disposed above the partition member. As shown in FIG. 4, a reflection pattern including the first reflection portion 102 and the second reflection portion 104 is formed on the surface of the diffusion plate 130. In the example of FIG. 4, the first reflecting portion 102 immediately above the light source 103 and the second reflecting portion 104 are formed in all the other regions. In the present specification, the reflectance of the reflection pattern is represented by shading in the drawings, and it is assumed that the dark color has a higher reflectance than the light color.

The first reflecting section 102 is arranged directly above the light source 103. In the area directly above the light source, the diffusion plate 13
Since the distance OD between 0 and the light source 103 is the shortest, the brightness in this region is high. In particular, the shorter the distance between the diffusion plate 130 and the light source 103, the more noticeable the uneven brightness in the area where the light source 103 is not arranged. By providing the first reflector 102 on the surface of the diffusion plate 130, the light source 103
The uneven brightness can be suppressed by reflecting a part of the light having high directivity and returning it toward the light source 103.

Further, in the present embodiment, the second reflecting portion 104 is provided not only immediately above the light source 103 but also above the area where the top 110B of the partition member 110 is arranged, which is not immediately above the light source 103.
Are arranged. The top 110B is an area that is a boundary between the non-lighting area and the lighting area when the light source 103 is locally dimmed.

The light in the lighting region is scattered and guided by the diffusion plate 130 and enters the adjacent non-lighting area,
As a result, the contrast ratio between the illuminated area and the non-illuminated area is reduced. FIG. 9 is an image diagram of surface luminance when light is incident on a non-lighting area adjacent to the lighting area. Once the light enters the non-lighted area, the light is guided to the entire non-lighted area due to the reflection by the wall portion 110A and the bottom surface 110C, and the whole non-lighted area shines similarly, and the contrast ratio decreases.

In the present embodiment, since the first reflector 102 and the second reflector 104 are arranged on the surface of the diffuser plate, the reflected light or scattered light by the diffuser plate 130 is reflected by the first reflector 102 and the non-illuminated part on the non-lighted portion. The second reflector 104 can reflect the light directly above the light source 103. FIG. 10 is an image diagram of the surface luminance when light does not enter the non-lighting area and the light is reflected upward by the second reflector 104. According to the present embodiment, it is possible to reduce the amount of light incident on the non-lighting area adjacent to the lighting area and improve the contrast ratio. The light scattered and reflected in the upward direction by the second reflecting unit 104 is attenuated depending on the distance from the light source 103, so that it is possible to suppress an increase in the amount of light in a specific unlit area.

The patterns of the first reflecting portion 102 and the second reflecting portion 104 formed on the surface of the diffuser plate 130 are not limited to the example of FIG. 4, but may be provided above the light source 103 and directly above the top 110B. It is possible to improve the contrast ratio. Note that, as shown in FIG. 5, the reflectance of the first reflecting portion 102 may be set to be lower toward the outside of the first reflecting portion 102.

The first reflecting portion 102, the second reflecting portion 104, and the third reflecting portion 106 described later are made of titanium oxide,
The diffuser plate 130 can be formed by applying a resin containing a reflecting material made of metal oxide particles such as aluminum oxide and silicon oxide. In addition to the reflecting material, the resin may contain a pigment, a light absorbing material, and a phosphor. As the resin, a photo-curable resin containing acrylate, epoxy, or the like as a main component is used, so that the resin can be fixed on the diffuser plate 130 by applying the resin and then irradiating with ultraviolet rays, for example. Alternatively, the light emitted from the light source 103 may be photo-cured. The resin can be applied by, for example, a printing method using a plate or an inkjet method.
The first reflecting portion 102, the second reflecting portion 104, and the third reflecting portion 106, which will be described later, are formed by bonding white PET or the like having a plurality of openings for adjusting the reflectance to the diffusion plate 130. Can also

Here, the reflectances of the first reflecting portion 102 and the second reflecting portion 104 may be the same or different. When the reflectances are different, it is preferable that the second reflector 104 be set to have a smaller reflectance than the first reflector 102. At the time of local dimming, the part that is the boundary between the lighted part and the non-lighted part is the farthest from the light source 103.
It becomes dark because the irradiation from 03 decreases. Therefore, by making the reflectance lower than the other portions to improve the brightness directly above the top 110B, it is possible to make the boundary between the two regions less conspicuous when the two adjacent regions are turned on.

In addition, the diffusion plate 130 is preferably arranged in direct or indirect contact with one or more tops 110B of the partition members 110. In other words, the diffusion plate 130 is the partition member 110.
Directly or indirectly supported by one or more tops 110B of. Thereby, the light source 10
Since the emitted light of No. 3 passes through between the diffusion plate 130 and the top 110B and is incident on the non-lighting area adjacent to the lighting area, the contrast ratio can be improved. Here, the direct contact means that the diffusion plate 130 contacts the top 110B as shown in FIG. 1E, and the indirect contact means that the second reflection part 104 diffuses as shown in FIG. 1D. When the diffusion plate 130 is formed on the lower surface of the plate 130, the diffuser plate 130 is placed on the top portion 11 via the second reflecting portion 104.
Refers to touching 0B.

The first reflecting portion 102 is preferably arranged inside the region divided by the dividing member 110. Light emitted from the light source 103 that is repeatedly reflected and scattered by the first reflector 102 and the partitioning member 110 easily escapes between the top 110B and the first reflector 102, and the brightness of the lighting area is less likely to decrease. is there.

The light source 103 may have any light distribution characteristic, but it is preferably a wide light distribution in order to illuminate each region surrounded by the wall 110A with less uneven brightness. Especially,
It is preferable that each of the light sources 103 has a bat wing type light distribution characteristic. Thus, the amount of light emitted right above the light source 103 is suppressed, the light distribution of each light source is expanded, and the expanded light is applied to the wall 110A and the bottom surface 110C, thereby being surrounded by the wall 110A. It is possible to suppress uneven brightness in each region.

Here, the bat wing type light distribution characteristic is defined as a light emission intensity distribution in which the light intensity is stronger than 0° at an angle where the optical axis L is 0° and the absolute value of the light distribution angle is larger than 0°. In addition,
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 bat wing type light distribution characteristic, for example, as shown in FIG.
A light source in which the light emitting element 108 having the light reflection film 122 on the upper surface is covered with the 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). 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 bat wing lens is not necessary 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. The thickness of the light source 103 can be about 0.5 to 2.0 mm including the sealing member 124 described later. The height of the partition member 110 to be combined with the light source 103 is 8.0 mm or less, preferably about 1.0 to 4.0 mm in the case of a thinner light emitting device. 8
． It is preferably about 0 mm or less, and about 2.0 to 4.0 mm for a thinner light emitting device. As a result, the backlight unit including the optical members such as the diffusion plate 130 can be made extremely thin.

The light reflection film 122 preferably has a reflectance angle dependency with respect to the incident angle with respect to the emission wavelength of the light emitting element 108. Specifically, the reflectance of the light reflection film 122 is set to be lower in oblique incidence than in vertical incidence. As a result, it is possible to suppress the change in the brightness immediately above the light emitting element to be moderate, and to prevent the area directly above the light emitting element from becoming a dark spot and becoming extremely dark.

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 may be arranged between the lower surface of the light emitting element 108 and the upper surface of the substrate 120. A light reflection layer 127 such as a white resist may be formed in a region of the conductor wirings 126A and 126B that is not electrically connected. The respective light sources 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.

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 have a viscosity that enables printing and dispenser application, and can be cured by heat treatment or irradiation with light. The shape of the sealing member 124 is, for example, a substantially hemispherical shape, a convex shape that is vertically long in the cross section (a shape in which the length in the Z direction is longer than the length in the X direction in the cross section), and flat in the cross section (cross section). It may be formed so as to have a convex 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 the top.

In the present embodiment, the light source 103 is formed by using one light emitting element 108 for each region partitioned by the wall portion 110A, but one light source 1 is formed by using a plurality of light emitting elements 108.
It may be 03.

It is preferable that the shape of the region divided by the wall portion 110A in plan view is a polygon. Accordingly, it becomes easy to divide the light emitting area into any number by the wall portion 110A according to the area of the light emitting surface of the surface light emitting device. The shape may be, for example, a square as shown in FIG. 2, a rectangle, or a hexagon.

The number of regions divided by the wall 110A can be set arbitrarily, and the position of the light source and the shape of the wall 110A can be changed according to a desired size.

As described above, in the present embodiment, the configuration in which the light scattered by the diffusion plate 130 is suppressed from entering the non-lighting area has been described. Similarly, the light scattered by the optical member or the wavelength conversion sheet and entering the non-lighting area can be reflected by the second reflecting section 104 to improve the contrast ratio.

In FIG. 1A, an example in which the first reflection part 102 and the second reflection part 104 are formed on the lower surface of the diffusion plate 130 has been described, but the first reflection part 102 and the second reflection part 104 are formed on the upper surface of the diffusion plate 130. It may be arranged or may be arranged on the lower surface.

When the light scattered in the diffusion plate 130 is reflected upward by the second reflection unit 104, the second reflection unit 104 is preferably arranged on the lower surface of the diffusion plate 130. Also, the diffusion plate 1
When the light scattered by the member above 30 is reflected upward by the second reflecting portion 104, it may be arranged on the upper surface of the diffusion plate 130.

The first reflecting portion 102 may also be formed on the lower surface or the upper surface of the diffusion plate 130. When arranged on the upper surface, the light diffusion distance can be increased by the thickness of the diffusion plate 130. Further, since the reflectance of the first reflecting portion 102 may be smaller after the light is scattered by the diffuser plate 130, the luminance reduction rate can be suppressed. 1B and 1E show an example in which the first reflector 102 and the second reflector 104 are formed on the upper surface of the diffusion plate 130.
As shown in FIG. 1D, the first reflector 102 is provided on the upper surface of the diffusion plate 130, and the second reflector 10 is provided.
4 may be provided on both the upper surface and the lower surface, such as being provided on the lower surface of the diffusion plate 130. In this case, the contrast ratio can be further increased while suppressing the luminance reduction rate.

As shown in FIG. 1C, a prism sheet (first prism sheet 150 and second prism sheet 160), a polarizing sheet 1 is provided above the light emitting device of the present embodiment at a predetermined distance.
An optical member such as 70 is arranged, and a liquid crystal panel is further arranged thereon, so that the surface emitting device can be used as a light source for a direct type backlight.

<Second Embodiment>
In the second embodiment, the reflection pattern formed on the diffusion plate 130 is a reflection pattern having a third reflection portion 106, as shown in FIGS. 6 and 7. The third reflector 106 has a top 110B.
Will be located directly above the intersecting area. The area where the tops 110B intersect is shown in FIG.
In A, the area is indicated by A and means the vicinity of the portion corresponding to the intersection of the apexes arranged in a grid pattern. It is preferable that the third reflecting section 106 has a smaller reflectance than the second reflecting section 104. When the diffuser plate 130 is arranged in contact with the top 110B, among the tops 110B where the light source 103 emits less light, the intersections of the tops 110B are darker than the non-intersections. Therefore, by setting the reflectance of the third reflecting portion 106 to be smaller than that of the second reflecting portion, it is possible to reduce uneven brightness in the lighting area during local dimming, so that the contrast ratio is improved. However, when the diffuser plate 130 is arranged above the top 110B by a support pin or the like, the intersections of the tops 110B are illuminated by the light sources 103 in four directions surrounding the intersections so that the intersections are crossed. In the case where it becomes brighter than the non-illuminated portion, by making the reflectance of the third reflecting portion 106 larger than that of the second reflecting portion, it is possible to reduce the brightness unevenness in the lighting area during local dimming, so that the contrast ratio is improved. improves.

<Third Embodiment>
In the third embodiment, as shown in FIG. 8, the second reflecting section 104 is formed in a grid pattern. The second reflecting portions 104 formed in a lattice shape are arranged along the top 110B. As a result, light emitted from the light source 103 that is repeatedly reflected and scattered by the first reflecting portion 102, the second reflecting portion 104, and the partitioning member 110 easily escapes between the second reflecting portion 104 and the first reflecting portion 102. Therefore, the brightness of the lighting area does not easily decrease. As a result, it is possible to suppress a decrease in brightness due to an increase in light scattering by the reflecting section, and it is possible to improve the contrast ratio by the second reflecting section 104.

<Fourth Embodiment>
In the fourth embodiment, as shown in FIG. 1C, a wavelength conversion sheet 140 that converts light from the light source 103 into light having different wavelengths is provided above the diffusion plate 130. In this case, the first reflecting section 102 has a light absorbing material that absorbs at least part of the wavelength of the light from the light source 103. Light is incident in a direction perpendicular to the wavelength conversion sheet at a portion where the distance between the light source 103 and the wavelength conversion sheet is short, that is, at a location where the first reflecting portion 102 is arranged, whereas at a portion away from the light source. Light is obliquely incident on the wavelength conversion sheet. When the light is oblique with respect to the vertical, the distance through which light passes through the wavelength conversion sheet becomes longer, and wavelength conversion is further performed. On the other hand, in the vertical direction, the wavelength cannot be completely converted and more light is transmitted through the wavelength conversion sheet. Therefore, by incorporating a light absorbing material in the first reflecting section 102, it is possible to reduce color unevenness of the surface light source.

<Fifth Embodiment>
In the fifth embodiment, as in the fourth embodiment, in order to reduce color unevenness, the second reflecting section 104 is used.
To contain a light absorbing material. In this case, the absorbing material absorbs at least a part of the wavelength range of the light emitted by the wavelength conversion sheet. As a result, it is possible to reduce color unevenness of the surface light source.

Materials and the like suitable for each component of the light emitting device of each embodiment will be described below.
(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.

Any material may be used as the material of the substrate as long as it can insulate and separate at least the pair of conductor wirings 126A and 126B. For example, ceramics, phenol resin, epoxy resin, polyimide resin, BT resin, polyphthalamide (PPA), polyethylene terephthalate (PET)
) And other resins. 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 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. An insulating resin or a conductive member may be 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 thereof include Cu-Ag-containing alloy, Au-Ge-containing alloy, Au-Si-containing alloy, Al-containing alloy, Cu-In-containing alloy, and a mixture of metal and flux.

(Light reflection layer)
It is preferable that the conductor wiring is covered with the light reflection layer 127 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 insulating and coating the conductor wiring may be arranged on the substrate 120, and the light reflection layer 127 can function as a resist. By including a white filler in a 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.
The light emitting element 108 can be selected to have any wavelength. For example, as a blue light emitting element and a green light emitting element, an element using a nitride semiconductor can be used. Further, GaAlAs, AlInGaP, or the like can be used as the red light emitting element. Furthermore, a semiconductor light emitting element 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)
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 arranged so as to cover the light emitting element. As a material for the sealing member, a translucent resin such as an epoxy resin, a silicone resin, or a resin obtained by mixing them, or glass can be used. Of these, it is preferable to select a silicone resin in consideration of light resistance and ease of molding.

Further, in the sealing member, 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, or to diffuse the light from the light emitting element A diffusing agent can be included. In addition, a colorant may be contained depending on 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.

102 1st reflective part 103 Light source 108 Light emitting element 122 Reflective film 124 Sealing member 104 2nd reflective part 106 3rd reflective part 110 Sorting member 110A Wall part 110B Top part 110C Bottom face 110D Through hole 120 Substrate 126A, 126B Conductor wiring 127 Light reflection Layer 128 Joining member 130 Diffuser 140 Wavelength conversion sheet 150 First prism sheet 160 Second prism sheet 170 Polarizing sheet

Claims (14)

A substrate on which a plurality of light sources are arranged,
A partitioning member that surrounds each of the light sources, has a top portion, and includes a plurality of regions formed by wall portions that are inclined so as to spread from a lower portion to an upper portion,
A diffusion plate provided on the partition member and directly or indirectly in contact with the top portion,
A plurality of first reflectors provided on the upper surface or the lower surface of the diffuser plate and directly above the light source;
A second reflector provided on the upper surface or the lower surface of the diffuser plate and directly above the top,
The light source includes a light emitting element and a sealing member that covers the light emitting element. The light emitting device according to claim 1, wherein the light source includes the 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, further comprising an optical member provided on the diffusion plate. The second reflector is disposed on the lower surface of the diffusion plate,
The light-emitting device according to claim 1, wherein the diffuser plate is arranged in contact with one or more tops of the partition member via the second reflecting portion. The light emitting device according to claim 1, wherein the second reflector has a smaller reflectance than the first reflector. The light emitting device according to claim 1, wherein the first reflecting portion is arranged inside the region of the partition member. The light emitting device according to claim 1, further comprising a wavelength conversion sheet that converts light from the light source into light having different wavelengths, above the diffusion plate. The light emitting device according to claim 7, wherein the second reflecting portion includes a light absorbing material that absorbs at least a part of a wavelength range of light emitted by the wavelength conversion sheet. The light emitting device according to claim 1, wherein the first reflecting portion has a light absorbing material that absorbs at least a part of a wavelength of light from the light source. When the X direction is parallel to the upper surface of the substrate, the Y direction is orthogonal to the X direction and is parallel to the upper surface of the substrate, and the Z direction is the direction orthogonal to the X direction and the Y direction, the sealing is performed. The member has a shape in which the length in the Z direction is longer than the length in the X direction in a cross-sectional view parallel to the X direction and the Z direction. Light emitting device. When the X direction is parallel to the upper surface of the substrate, the Y direction is orthogonal to the X direction and is parallel to the upper surface of the substrate, and the Z direction is the direction orthogonal to the X direction and the Y direction, the sealing is performed. 10. The member according to claim 1, wherein the member has a shape in which the length in the X direction is longer than the length in the Z direction in a cross-sectional view parallel to the X direction and the Z direction. Light emitting device. The light emitting device according to claim 1, wherein the sealing member has a circular shape or an elliptical shape in a top view. The first reflector is provided on the upper surface of the diffusion plate,
The light emitting device according to claim 1, wherein the second reflecting portion is provided on a lower surface of the diffusion plate. A third reflection part provided directly above the region where the tops intersect,
The diffusion plate is disposed on the third reflecting portion,
The light emitting device according to claim 1, wherein the third reflecting portion has a reflectance lower than that of the second reflecting portion.