JP2018022683A - Light emitting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surface light emitting device which can improve a contrast ratio between a lighting area and a non-lighting area.SOLUTION: A light emitting device includes: a substrate 120 on which a plurality of light sources 103 are arranged; a section member 110 for surrounding each of the light sources 103, and including a plurality of regions each of which is formed by a wall part 110A having an apex 110B; a diffusion plate 130 provided on the section member 110, and coming into contact with the apexes 110B directly or indirectly; a plurality of first reflection parts 102 which are on an upper surface or a lower surface of the diffusion plate 130, and which are provided right above the light sources 103; and second reflection parts 104 which are on the upper surface or the lower surface of the diffusion plate 130, and which are provided right above the apexes 110B.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 light emitting device as disclosed in Patent Document 1 is known.
The light-emitting device disclosed in Patent Document 1 has a frame having a peripheral wall around a plurality of light sources and arranged in a matrix. This allows local dimming (also called partial drive) to increase the contrast ratio in multiple areas by controlling the amount of light emitted for each light source while preventing light leakage outside the area by dividing the light emitting area. It is said.

JP 2013-25945 A

  However, when the light source is locally dimmed by such a surface light emitting device, the light emitted from the light source in the lighting area and scattered and guided by the diffusion plate or the like enters the non-lighting area adjacent to the lighting area and is not 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 light emitting device capable of improving the contrast ratio between a lighting area and a 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 disposed, a partition member that includes a plurality of regions that surround each of the light sources and that has a top portion, and the partition member. A diffuser plate that is directly or indirectly in contact with the top, a plurality of first reflectors that are provided on the top surface or the bottom surface of the diffuser plate and directly above the light source, and an upper surface of the diffuser plate Or it is a lower surface, Comprising: It has the 2nd reflection part provided just above the said top part.

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

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 another 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 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 the schematic which shows an example of the reflective pattern of the diffusion plate which concerns on 1st Embodiment of this invention. It is the schematic which shows an example of the reflective pattern of the diffusion plate which concerns on 1st Embodiment of this invention. It is the schematic which shows an example of the reflective pattern of the diffusion plate which concerns on 2nd Embodiment of this invention. It is the schematic which shows an example of the reflective pattern of the diffusion plate which concerns on 2nd Embodiment of this invention. It is the schematic which shows an example of the reflective pattern of the diffusion plate which concerns on 3rd Embodiment of this 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 cross-sectional view showing the overall configuration of the light emitting device. A light emitting device according to an embodiment of the present invention includes a substrate 120 on which a plurality of light sources 103 are arranged, and a partition member 110 that includes a plurality of regions that surround each of the light sources 103 and are formed by a wall portion 110A having a top portion 110B. A diffusion plate 130 provided on the partition member 110 and in direct or indirect contact with the top, and a plurality of first reflection units 102 provided on the upper surface or the lower surface of the diffusion plate 130 and directly above the light source 103. 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 this specification, the “light source” refers to a member that emits light. For example, not only a light emitting element that emits light itself, but also a light emitting element sealed with a translucent resin, packaging, The surface-mounted light-emitting device (also referred to as an LED) is used. For example, in this embodiment, the light source 103 is formed by covering the light emitting element 108 with the sealing member 124.

  FIG. 2 shows a schematic top view of the light emitting device with the diffusion plate 130 removed. In the present embodiment, five light sources 103 are arranged in a matrix, with five in the X direction and five in the Y direction. The partition member 110 disposed on the substrate 120 divides the plurality of regions into a substantially square shape when viewed from the top, and the light source 103 is disposed substantially at the center of each of the divided regions.

  The sorting member 110 has light reflectivity, and the light emitted from the light source 103 can be efficiently reflected by the wall 110A. In the present embodiment, the sorting member 110 has a bottom surface 110C and a wall portion 110A having a top portion 110B. The sorting member 110 has a recess 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 disposed 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 that exposes the entire light source 103. Further, it is preferable that the outer edge of the through hole is formed only in the vicinity of the light source 103 so that the light from the light source can be reflected by the bottom surface 110 </ b> C.

  The sorting member 110 may be molded using a resin containing a reflective material made of metal oxide particles such as titanium oxide, aluminum oxide, and silicon oxide, or after being molded using a resin not containing a reflective material, 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.

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

  The wall portion 110A formed so as to surround the light source 103 preferably has a surface that is inclined so as to spread from the bottom to the top with respect to the bottom surface 110C and the top surface of the substrate 120.

  The lower surface of the bottom surface 110C of the sorting member 110 and the upper surface of the substrate 120 are fixed by an adhesive member or the like. It is preferable that the periphery of the through hole is fixed with an adhesive member so that light emitted from the light source 103 does not enter between the substrate 120 and the sorting member 110. 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 adhesive sheet, or an adhesive liquid of thermosetting resin or thermoplastic resin. These adhesive members preferably have high flame retardancy. Moreover, it may be fixed with screws instead of the 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 sorting member. As shown in FIG. 4, a reflection pattern including the first reflection part 102 and the second reflection part 104 is formed on the surface of the diffusion plate 130. In the example of FIG. 4, the first reflecting portion 102 directly above the light source 103 and the second reflecting portion 104 are formed in all other regions. In the present specification, the reflectance of the reflection pattern is represented by shading in the drawing, and it is assumed that the dark color has a higher reflectance than the light color.

  The first reflecting unit 102 is disposed immediately above the light source 103. Since the distance OD between the diffusion plate 130 and the light source 103 is the shortest in the region directly above the light source, the luminance in this region is high. In particular, as the distance between the diffuser plate 130 and the light source 103 is shorter, the luminance unevenness between the region where the light source 103 is not arranged becomes more prominent. By providing the first reflecting portion 102 on the surface of the diffusion plate 130, luminance unevenness can be suppressed by reflecting a part of light having high directivity of the light source 103 and returning it to the light source 103 direction.

  Furthermore, in the present embodiment, the second reflecting portion 104 is disposed not only directly above the light source 103 but also directly above the region where the top portion 110B of the sorting member 110 is disposed, which is not directly above the light source 103. . The top portion 110 </ b> B is a region that becomes a boundary between the non-lighting region and the lighting region when the light source 103 is locally dimmed.

  The light in the lighting area is scattered and guided by the diffusion plate 130 and is incident on an adjacent non-lighting area, thereby reducing the contrast ratio between the lighting area and the non-lighting area. 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-lighting area, the light is guided to the entire non-lighting area due to reflection by the wall 110A and the bottom surface 110C, and the whole non-lighting area shines in the same manner, and the contrast ratio decreases.

  In this embodiment, since the 1st reflection part 102 and the 2nd reflection part 104 are arrange | positioned on the surface of a diffusion plate, the 1st reflection part 102 on a non-lighting location and the reflected light or scattered light by a diffusion plate 130 The second reflection unit 104 can reflect the light directly above the light source 103. FIG. 10 is an image diagram of surface luminance when light is not incident on the non-lighting area and light is reflected upward by the second reflecting unit 104. According to the present embodiment, the amount of light incident on the non-lighting area adjacent to the lighting area can be reduced, and the contrast ratio can be improved. The light scattered and reflected upward by the second reflecting unit 104 is attenuated by the distance from the light source 103, so that it is possible to suppress an increase in the amount of light in a specific non-lighting area.

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

The first reflecting portion 102, the second reflecting portion 104, and the third reflecting portion 106, which will be described later, apply a resin containing a reflecting material made of metal oxide particles such as titanium oxide, aluminum oxide, and silicon oxide to the diffusion plate 130. Can be formed. In addition to the reflecting material, the resin may contain a pigment, a light absorbing material, and a phosphor. By using a photo-curing resin whose main component is acrylate, epoxy or the like as the resin, the resin can be fixed on the diffusion plate 130 by, for example, irradiating with ultraviolet rays. Further, it may be photocured with light emitted from the light source 103. For the application of the resin, for example, a printing method using a plate or an ink jet method can be used.
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 provided with a plurality of openings for adjusting the reflectance to the diffusion plate 130. You can also.

  Here, the reflectances of the first reflection unit 102 and the second reflection unit 104 may be the same or different. When making the reflectances different, it is preferable to set the second reflecting portion 104 so that the reflectance is smaller than that of the first reflecting portion 102. At the time of local dimming, the part that becomes the boundary between the lighting part and the non-lighting part is farthest from the light source 103, and therefore, the irradiation from the light source 103 is reduced, so that the part becomes dark. Therefore, by making the reflectance lower than that of other portions and improving the luminance directly above the top portion 110B, the boundary between the two regions can be made less noticeable when the two adjacent regions are lit.

  Moreover, it is preferable that the diffusion plate 130 is disposed in direct or indirect contact with one or more top portions 110B of the partition member 110. In other words, the diffusion plate 130 is supported directly or indirectly by one or more top portions 110B of the partition member 110. Thereby, since the emitted light of the light source 103 passes between the diffuser plate 130 and the top portion 110B and is not 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 portion 110B as shown in FIG. 1E, and the indirect contact means that the second reflection portion 104 diffuses as shown in FIG. 1D. In the case of being formed on the lower surface of the plate 130, this means that the diffusion plate 130 contacts the top portion 110 </ b> B via the second reflecting portion 104.

  It is preferable that the first reflecting portion 102 is disposed inside the region divided by the dividing member 110. This is because the light emitted from the light source 103 that repeatedly reflects and scatters by the first reflecting portion 102 and the dividing member 110 is easily lost between the top portion 110B and the first reflecting portion 102, and the luminance of the lighting area is difficult to decrease. is there.

  The light distribution characteristics of the light source 103 may be any, but wide light distribution is preferable in order to shine each region surrounded by the wall 110A with less luminance unevenness. In particular, each of the light sources 103 preferably has a batwing type light distribution characteristic. As a result, the amount of light emitted directly above the light source 103 is suppressed, the light distribution of each light source is expanded, and the expanded light is irradiated to the wall portion 110A and the bottom surface 110C, thereby being surrounded by the wall portion 110A. Luminance unevenness in each region can be suppressed.

  Here, the batwing-type light distribution characteristic is defined as a light emission intensity distribution having a light emission intensity 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 °. The optical axis L is defined as a line that passes through the center of the light source 103 and perpendicularly intersects with a line on the plane of the substrate 120, as shown in FIG.

  As the light source 103 having a batwing type light distribution characteristic, for example, as shown in FIG. 3, a light source in which a light emitting element 108 having a light reflection film 122 on its 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 batwing type light distribution characteristic can be obtained. Since the light reflecting film 122 can be directly formed on the light emitting element 108, a batwing 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 reflecting film 122 is 0.1 to 3.0 μm. Even if the 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 division member 110 combined with such a light source 103 is preferably 8.0 mm or less, and preferably about 1.0 to 4.0 mm when a thinner light emitting device is used. In the case of a light-emitting device having a thickness of about 8.0 mm or less and a thinner thickness, the thickness 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.

  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 reflecting film 122 is set so that the oblique incidence is lower than the perpendicular incidence. Accordingly, it is possible to suppress an extremely dark state such that a change in luminance immediately above the light emitting element becomes gradual and a light spot just above the light emitting element becomes a dark spot.

  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 126 </ b> A and 126 </ b> B provided on the upper surface of the substrate 120. An underfill may be disposed between the lower surface of the light emitting element 108 and the upper surface of the substrate 120. A light reflecting layer 127 such as a white resist may be formed in a region of the conductor wirings 126A and 126B where electrical connection is not performed. The respective light sources 103 arranged on the substrate 120 can be driven independently of each other, and dimming control for each light source (for example, local dimming or HDR) is possible.

  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 and dispenser application, and can be cured by heat treatment or light irradiation. As the shape of the sealing member 124, for example, a substantially hemispherical shape, a convex shape that is vertically long 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 in cross-sectional view (the cross-section) It may be formed to have a convex shape that is longer in the X direction than the length in the Z direction when viewed, or a circular or elliptical shape when viewed from above.

  In the present embodiment, the light source 103 is exemplified by using one light emitting element 108 for each region partitioned by the wall portion 110 </ b> A, but as one light source 103 using a plurality of light emitting elements 108. Also good.

  It is preferable that the shape in plan view of the region divided by the wall 110A is a polygon. Thereby, according to the area of the light emission surface of a surface light-emitting device, it becomes easy to divide light emission areas into arbitrary numbers by wall part 110A. Examples of the shape include a square, a rectangle, and a hexagon as shown in FIG.

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

  As mentioned above, in this embodiment, although the structure which suppresses that the light scattered by the diffuser plate 130 enters into a non-lighting area | region was described, this invention is a prism sheet, a polarizing sheet, etc. which are arrange | positioned above the diffuser plate 130, etc. Similarly, the light that is scattered by the optical member or the wavelength conversion sheet and enters the non-lighting region can be reflected by the second reflection unit 104 to improve the contrast ratio.

  In FIG. 1A, the example in which the first reflection unit 102 and the second reflection unit 104 are formed on the lower surface of the diffusion plate 130 has been described. However, the first reflection unit 102 and the second reflection unit 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 disposed on the lower surface of the diffusion plate 130. Further, when the light scattered by the member above the diffusion plate 130 is reflected upward by the second reflection unit 104, it may be disposed 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. Moreover, since the reflectance of the 1st reflection part 102 may be smaller after being scattered by the diffusing plate 130, the luminance reduction rate can be suppressed. FIGS. 1B and 1E show an example in which the first reflecting portion 102 and the second reflecting portion 104 are formed on the upper surface of the diffusion plate 130.
As shown in FIG. 1D, the first reflection unit 102 may be provided on the upper surface of the diffusion plate 130, and the second reflection unit 104 may be provided on the lower surface of the diffusion plate 130. In this case, it is possible to further increase the contrast ratio while suppressing the luminance reduction rate.

  As shown in FIG. 1C, optical members such as a prism sheet (first prism sheet 150 and second prism sheet 160) and a polarizing sheet 170 are arranged above the light emitting device of the present embodiment described above at a predetermined distance. Furthermore, a liquid crystal panel can be further disposed thereon, and a surface light emitting device used as a light source for a direct type backlight can be obtained.

Second Embodiment
In the second embodiment, the reflection pattern formed on the diffusion plate 130 is a reflection pattern having a third reflection unit 106 as shown in FIGS. 6 and 7. The third reflecting portion 106 is arranged immediately above the region where the top portion 110B intersects. The region where the top portions 110B intersect with each other is a region indicated by A in FIG. 2 and is in the vicinity of the portion corresponding to the intersection of the top portions arranged in a lattice shape. The third reflection unit 106 preferably has a smaller reflectance than the second reflection unit 104. In the case where the diffuser plate 130 is disposed in contact with the top portion 110B, a portion where the top portion 110B intersects among the top portions 110B that are less irradiated from the light source 103 is darker than a portion that does not intersect. Therefore, by making the reflectance of the third reflecting portion 106 smaller than that of the second reflecting portion, luminance unevenness in the lighting area during local dimming can be reduced, and the contrast ratio is improved. However, when the diffuser plate 130 is disposed above the top 110B by a support pin or the like, the intersection of the top 110B is irradiated by the light source 103 in four directions surrounding the intersection, In the case where the brightness is brighter than the part that is not, the luminance ratio in the lighting area during local dimming can be reduced by making the reflectance of the third reflecting portion 106 larger than that of the second reflecting portion. improves.

<Third Embodiment>
In the third embodiment, as shown in FIG. 8, the second reflecting portion 104 is formed in a lattice shape. The 2nd reflection part 104 formed in the grid | lattice form will be arrange | positioned along the top part 110B. As a result, the light emitted from the light source 103 that repeatedly reflects and scatters by the first reflecting portion 102, the second reflecting portion 104, and the sorting member 110 can easily escape between the second reflecting portion 104 and the first reflecting portion 102. Therefore, the brightness of the lighting area is unlikely to decrease. Thereby, it can suppress that a brightness | luminance falls by the increase in the light scattering by a reflection part, and the contrast ratio can be improved by the 2nd reflection part 104. FIG.

<Fourth embodiment>
In 4th Embodiment, it has the wavelength conversion sheet 140 which converts the light from the light source 103 into the light of a different wavelength, as shown to FIG. In this case, the first reflection unit 102 includes a light absorbing material that absorbs at least part of the wavelength of light from the light source 103. In a portion where the distance between the light source 103 and the wavelength conversion sheet is short, that is, in a place where the first reflection unit 102 is disposed, light is incident in a direction perpendicular to the wavelength conversion sheet, whereas in a portion away from the light source. Light is incident on the wavelength conversion sheet in an oblique direction. The distance that light passes through the wavelength conversion sheet becomes longer with respect to the vertical, and wavelength conversion is further performed. On the other hand, in the vertical direction, the wavelength is not completely converted, and more light is transmitted through the wavelength conversion sheet as it is. Therefore, by including a light absorbing material in the first reflecting portion 102, color unevenness of the surface light source can be reduced.

<Fifth Embodiment>
In the fifth embodiment, a light absorbing material is included in the second reflecting portion 104 in order to reduce color unevenness as in the fourth embodiment. In this case, the absorbing material absorbs at least a part of the wavelength range of light emitted from the wavelength conversion sheet. Thereby, the color nonuniformity of a surface light source can be reduced.

Below, the material etc. which are suitable for each structural member of the light-emitting device of each embodiment are demonstrated.
(substrate)
The substrate 120 is a member on which the light source 103 is placed, 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.

  As a material for the substrate, any material that can insulate and separate at least the pair of conductor wirings 126A and 126B may be used. 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 in which an insulating layer is formed on a metal member may be used.

  The thickness of the substrate can be selected as appropriate, 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 thin rigid substrate that can be bent.

(Joining member)
The bonding 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 can 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- Cu-Ag containing alloy, Au-Ge containing alloy, Au-Si containing alloy, Al containing alloy, Cu-In containing alloy, the mixture of a metal and a flux, etc. can be mentioned.

(Light reflection layer)
The conductor wiring is preferably covered with the light reflecting layer 127 except for the portion that is 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 disposed on the substrate 120, and the light reflecting layer 127 can function as a resist. By incorporating a white filler into the 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)
A known element can be used as the light emitting element 108. For example, a light emitting diode is preferably used as the light emitting element 108.
The light emitting element 108 can be selected to have an arbitrary wavelength. For example, as the blue and green light emitting elements, those using nitride semiconductors can be used. As the red light emitting element, GaAlAs, AlInGaP, or the like can be used. Furthermore, a semiconductor light emitting element made of a material other than this can also be used. The composition, emission color, size, number, and the like of the light emitting element to be used can be appropriately selected according to the purpose.

(Sealing member)
The sealing member 124 may be disposed 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 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.

  Furthermore, the sealing member absorbs light from the light emitting element and emits light having a wavelength different from that of the output light from the light emitting element, or diffuses light from the light emitting element. A diffusing agent can be included. In addition, a colorant can be included 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 for a display device and a light source for a lighting device.

DESCRIPTION OF SYMBOLS 102 1st reflection part 103 Light source 108 Light emitting element 122 Reflective film 124 Sealing member 104 2nd reflection part 106 3rd reflection part 110 Partition member 110A Wall part 110B Top part 110C Bottom surface 110D Through-hole 120 Board | substrate 126A, 126B Conductor wiring 127 Light reflection Layer 128 Bonding member 130 Diffuser plate 140 Wavelength conversion sheet 150 First prism sheet 160 Second prism sheet 170 Polarizing sheet

Claims (10)

A substrate on which a plurality of light sources are arranged;
A partition member that includes a plurality of regions that surround each of the light sources and is formed by a wall portion having a top portion;
A diffusion plate provided on the partition member and in direct or indirect contact with the top;
A plurality of first reflecting portions provided on an upper surface or a lower surface of the diffuser plate and immediately above the light source;
A light emitting device comprising: a second reflecting portion provided on an upper surface or a lower surface of the diffusion plate and immediately above the top portion.   The light-emitting device according to claim 1, further comprising an optical member provided on the diffusion plate. The second reflecting portion is disposed on a lower surface of the diffusion plate;
The light-emitting device according to claim 1, wherein the diffuser plate is disposed in contact with one or more top portions of the sorting member via the second reflecting portion.   The light emitting device according to any one of claims 1 to 3, wherein the second reflecting unit has a smaller reflectance than the first reflecting unit.   The light emitting device according to any one of claims 1 to 4, wherein the first reflecting portion is disposed inside the region of the sorting member. A third reflecting portion provided immediately above the region where the tops intersect;
The diffuser plate is disposed on the third reflecting portion;
The light emitting device according to claim 1, wherein the third reflecting unit has a reflectance smaller than that of the second reflecting unit. Above the diffusion plate, having a wavelength conversion sheet that converts light from the light source into light of different wavelengths,
The light emitting device according to claim 1, wherein the first reflection unit includes a light absorbing material that absorbs at least a part of a wavelength of light from the light source. Above the diffusion plate, having a wavelength conversion sheet that converts light from the light source into light of different wavelengths,
The light emitting device according to claim 1, wherein the second reflecting unit 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 source 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 first reflection portion is provided on an 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 diffusing plate.