Light-emitting module and planar light source

Abstract

The present invention provides a light-emitting module and a planar light source capable of adjusting the amount of light propagating between adjacent light-guiding portions partitioned by grooves in a light-guiding member. The first side surface of the first light-guiding portion includes a first A side surface and a second B side surface. The second side surface of the second light-guiding portion includes a second A side surface opposed to the first A side surface and a second B side surface opposed to the first B side surface. The light reflecting member is disposed on at least one of the first B side surface and the second B side surface so as to expose the first A side surface and the second A side surface. The distance between the first A side surface and the second A side surface is closer than the distance between the first B side surface and the second B side surface.

Description

Technical Field

[0001] The present invention relates to a light-emitting module and a planar light source. Background Art

[0002] A light-emitting module formed by combining a light-emitting element such as a light-emitting diode and a light guide plate is widely used in a planar light source such as a backlight of a liquid crystal display. In addition, a planar light source has been proposed in which the light guide plate is divided into a plurality of regions by grooves, and light emission and non-light emission can be controlled for each region (for example, Patent Document 1).

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2018-101521 Summary of the Invention

[0006] Problems to be Solved by the Invention

[0007] An object of an embodiment of the present invention is to provide a light-emitting module and a planar light source that can reduce a decrease in brightness that occurs between adjacent light guide portions divided by grooves in a light guide member.

[0008] Technical Means for Solving the Problems

[0009] According to one aspect of the present invention, a light-emitting module includes: a light source unit including a first light source and a second light source; a light guide member including a first light guide portion and a second light guide portion, the first light guide portion including a first A main surface, a first B main surface located on the opposite side of the first A main surface, a first side surface located between the first A main surface and the first B main surface, and a first hole portion for arranging the first light source, the second light guide portion including a second A main surface, a second B main surface located on the opposite side of the second A main surface, a second side surface located between the second A main surface and the second B main surface and facing the first side surface, and a second hole portion for arranging the second light source; and a light reflection member arranged between the first side surface and the second side surface. The first side surface includes a first A side surface and a first B side surface. The second side surface includes a second A side surface facing the first A side surface and a second B side surface facing the first B side surface. The light reflection member is arranged on at least one of the first B side surface and the second B side surface so as to expose the first A side surface and the second A side surface. The distance between the first A side surface and the second A side surface is closer than the distance between the first B side surface and the second B side surface.

[0010] Effects of the Invention

[0011] According to an embodiment of the present invention, it is possible to reduce the reduction in brightness that may occur between adjacent light guide portions divided by grooves in the light guide member. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic top view of a planar light source according to a first embodiment of the present invention.

[0013] Figure 2 is along Figure 1 schematic cross-sectional view taken along line II-II.

[0014] Figure 3A is a schematic top view of a light source in a planar light source according to a first embodiment of the present invention.

[0015] Figure 3B is a schematic bottom view of a light source in a planar light source according to a first embodiment of the present invention.

[0016] Figure 3C is along Figure 3A schematic cross-sectional view taken along line IIIC-IIIC.

[0017] Figure 3D is along Figure 3A schematic cross-sectional view taken along line IIID-IIID.

[0018] Figure 4 is a schematic cross-sectional view showing a method of manufacturing a planar light source according to a first embodiment of the present invention.

[0019] Figure 5 is a schematic cross-sectional view showing a method of manufacturing a planar light source according to a first embodiment of the present invention.

[0020] Figure 6 is a schematic cross-sectional view showing a method of manufacturing a planar light source according to a first embodiment of the present invention.

[0021] Figure 7 is a schematic cross-sectional view showing a method of manufacturing a planar light source according to a first embodiment of the present invention.

[0022] Figure 8 is a schematic cross-sectional view showing a method of manufacturing a planar light source according to a first embodiment of the present invention.

[0023] Figure 9 is a schematic cross-sectional view showing a method of manufacturing a planar light source according to a first embodiment of the present invention.

[0024] Figure 10 is a schematic cross-sectional view showing a method of manufacturing a planar light source according to a first embodiment of the present invention.

[0025] Figure 11It is a schematic cross-sectional view showing a method for manufacturing a planar light source according to the first embodiment of the present invention.

[0026] Figure 12 It is a schematic cross-sectional view showing a method for manufacturing a planar light source according to the first embodiment of the present invention.

[0027] Figure 13 It is a schematic cross-sectional view showing a method for manufacturing a planar light source according to the first embodiment of the present invention.

[0028] Figure 14 It is a schematic cross-sectional view showing a method for manufacturing a planar light source according to the first embodiment of the present invention.

[0029] Figure 15 It is a schematic cross-sectional view showing a method for manufacturing a planar light source according to the first embodiment of the present invention.

[0030] Figure 16 It is a schematic cross-sectional view showing a method for manufacturing a planar light source according to the first embodiment of the present invention.

[0031] Figure 17 It is a schematic cross-sectional view showing a method for manufacturing a planar light source according to the first embodiment of the present invention.

[0032] Figure 18 It is a schematic cross-sectional view showing a method for manufacturing a planar light source according to the first embodiment of the present invention.

[0033] Figure 19 It is a schematic cross-sectional view showing a method for manufacturing a planar light source according to the first embodiment of the present invention.

[0034] Figure 20 It is a schematic cross-sectional view showing a method for manufacturing a planar light source according to the first embodiment of the present invention.

[0035] Figure 21 It is a schematic cross-sectional view of a planar light source according to the second embodiment of the present invention.

[0036] Figure 22A It is a schematic cross-sectional view showing a method for manufacturing a planar light source according to the second embodiment of the present invention.

[0037] Figure 22B It is a schematic cross-sectional view showing a method for manufacturing a planar light source according to the second embodiment of the present invention.

[0038] Figure 23 It is a schematic cross-sectional view of a planar light source according to the third embodiment of the present invention.

[0039] Figure 24A It is an observation Figure 23 Schematic top view of the B main surface side of the light guide part in the planar light source.

[0040] Figure 24B Is an observation Figure 23 Schematic top view of the B main surface side of the light guide portion in the planar light source being observed.

[0041] Figure 25A Is a schematic cross-sectional view showing the manufacturing method of the planar light source according to the third embodiment of the present invention.

[0042] Figure 25B Is a schematic cross-sectional view showing the manufacturing method of the planar light source according to the third embodiment of the present invention.

[0043] Figure 25C Is a schematic cross-sectional view showing the manufacturing method of the planar light source according to the third embodiment of the present invention.

[0044] Figure 26A Is a schematic cross-sectional view showing an example of the cross-sectional shape of the dividing groove in the planar light source according to the embodiment of the present invention.

[0045] Figure 26B Is a schematic cross-sectional view showing an example of the cross-sectional shape of the dividing groove in the planar light source according to the embodiment of the present invention.

[0046] Figure 26C Is a schematic cross-sectional view showing an example of the cross-sectional shape of the dividing groove in the planar light source according to the embodiment of the present invention.

[0047] Figure 26D Is a schematic cross-sectional view showing an example of the cross-sectional shape of the dividing groove in the planar light source according to the embodiment of the present invention.

[0048] Figure 26E Is a schematic cross-sectional view showing an example of the cross-sectional shape of the dividing groove in the planar light source according to the embodiment of the present invention.

[0049] Figure 26F Is a schematic cross-sectional view showing an example of the cross-sectional shape of the dividing groove in the planar light source according to the embodiment of the present invention.

[0050] Figure 26G Is a schematic cross-sectional view showing an example of the cross-sectional shape of the dividing groove in the planar light source according to the embodiment of the present invention.

[0051] Figure 26H Is a schematic cross-sectional view showing an example of the cross-sectional shape of the dividing groove in the planar light source according to the embodiment of the present invention.

[0052] Figure 26I Is a schematic cross-sectional view showing an example of the cross-sectional shape of the dividing groove in the planar light source according to the embodiment of the present invention.

[0053] Figure 26JIt is a schematic cross-sectional view showing an example of the cross-sectional shape of the dividing groove in the planar light source according to an embodiment of the present invention.

[0054] Figure 26K It is a schematic cross-sectional view showing an example of the cross-sectional shape of the dividing groove in the planar light source according to an embodiment of the present invention.

[0055] Figure 27 It is a schematic cross-sectional view of a part of the light source arrangement in the planar light source according to the fourth embodiment of the present invention.

[0056] Figure 28A It is a schematic cross-sectional view showing an example of the outer peripheral portion in the planar light source according to an embodiment of the present invention.

[0057] Figure 28B It is a schematic cross-sectional view showing an example of the outer peripheral portion in the planar light source according to an embodiment of the present invention.

[0058] Figure 29 It is a schematic cross-sectional view showing an example of the outer peripheral portion in the planar light source according to an embodiment of the present invention.

[0059] Figure 30 It is a schematic cross-sectional view showing an example of the outer peripheral portion in the display device including the planar light source according to an embodiment of the present invention.

[0060] Figure 31 It is a schematic cross-sectional view of the display device including the planar light source according to an embodiment of the present invention.

[0061] Figure 32 It is a schematic top view of the planar light source according to the fifth embodiment of the present invention.

[0062] Figure 33 It is along Figure 32 XXXIII-XXXIII line of the schematic cross-sectional view.

[0063] Figure 34A It is a schematic cross-sectional view showing the dividing groove in the planar light source according to the fifth embodiment of the present invention.

[0064] Figure 34B It is a schematic cross-sectional view showing an example of the cross-sectional shape of the dividing groove in the planar light source according to an embodiment of the present invention.

[0065] Figure 35A It is a schematic cross-sectional view of the manufacturing method of the planar light source according to the fifth embodiment of the present invention.

[0066] Figure 35B It is a schematic cross-sectional view of the manufacturing method of the planar light source according to the fifth embodiment of the present invention.

[0067] Figure 35CIt is a schematic cross-sectional view showing a method for manufacturing a planar light source according to a fifth embodiment of the present invention.

[0068] Figure 35D It is a schematic cross-sectional view showing a method for manufacturing a planar light source according to a fifth embodiment of the present invention.

[0069] Figure 35E It is a schematic cross-sectional view showing a method for manufacturing a planar light source according to a fifth embodiment of the present invention.

[0070] Figure 36 It is a schematic plan view showing an example of a display device including a planar light source according to an embodiment of the present invention.

[0071] Figure 37 It is along Figure 36 XXXVII-XXXVII line of the schematic cross-sectional view.

[0072] Figure 38 It is from Figure 36 The schematic plan view of the display device omitting the optical sheet and the liquid crystal panel.

[0073] Figure 39 It is a schematic plan view showing an example of a planar light source according to an embodiment of the present invention.

[0074] Figure 40 It is a schematic plan view showing an example of a planar light source and a holding member according to an embodiment of the present invention.

[0075] Figure 41 It is a schematic cross-sectional view showing an example of a display device including a planar light source according to an embodiment of the present invention.

[0076] Figure 42 It is a schematic cross-sectional view showing an example of a display device including a planar light source according to an embodiment of the present invention.

[0077] Explanation of reference numerals

[0078] 5 Light-emitting region

[0079] 10 Light guide member

[0080] 10A First light guide part

[0081] 10B Second light guide part

[0082] 11A First A main surface

[0083] 11B First B main surface

[0084] 12A Second A main surface

[0085] 12B Second B main surface

[0086] 13A First hole part

[0087] 13B Second hole part

[0088] 14 Partition groove

[0089] 14a First groove part

[0090] 14b Second groove part

[0091] 15 First side surface

[0092] 15A First A side surface

[0093] 15B First B side surface

[0094] 15C First C side surface

[0095] 16 Second side surface

[0096] 16A Second A side surface

[0097] 16B Second B side surface

[0098] 16C Second C side surface

[0099] 20 Light source part

[0100] 20A First light source

[0101] 20B Second light source

[0102] 21 Light-emitting element

[0103] 22 First light-transmissive component

[0104] 24 Covering component

[0105] 25 First light adjustment component

[0106] 40 Light reflection component

[0107] 40A First light reflection component

[0108] 40B Second light reflection component

[0109] 42 Third light reflection component

[0110] 50 Wiring substrate

[0111] 71 Second light-transmissive component

[0112] 72 Wavelength conversion component

[0113] 73 Third light-transmissive component

[0114] 74 Second light adjustment component

[0115] 81 First opening

[0116] 100 Light-emitting module

[0117] 110 Light guide plate

[0118] 113 Concave portion

[0119] 200, 210 Support member

[0120] 300 Planar light source Detailed implementation mode

[0121] Hereinafter, with reference to the drawings, the implementation mode will be described. Each drawing is a schematic drawing showing the implementation mode, so sometimes the scale, interval, positional relationship, etc. of each component are exaggerated, a part of the illustration of the component is omitted, or it is used as a cross-sectional view and only the end view showing the cut surface is shown. It should be noted that in each drawing, the same reference numerals are assigned to the same structures.

[0122] [First Embodiment]

[0123] Figure 1 It is a schematic top view of the planar light source 300 of the first embodiment of the present invention. Figure 1 It represents a top view of observing the light-emitting surface of the planar light source 300. Two directions parallel to and orthogonal to each other with respect to the light-emitting surface of the planar light source 300 are set as the X direction and the Y direction. In addition, the direction orthogonal to the X direction and the Y direction is set as the Z direction.

[0124] The planar light source 300 includes a light guide member 10 and a light source unit 20. The light guide member 10 has light transmissibility with respect to the light emitted from the light source unit 20. As will be described later, the light source unit 20 includes at least a light-emitting element. The light emitted from the light source unit 20 includes at least the light emitted from the light-emitting element. In addition, for example, when the light source unit 20 includes a phosphor, the light emitted from the light source unit 20 also includes the light emitted from the phosphor. The light transmittance of the light guide member 10 with respect to the light from the light source unit 20 is preferably 80% or more, more preferably 90% or more, for example.

[0125] The light guide member 10 is divided into a plurality of light guide portions by a dividing groove 14. The dividing groove 14 is in a lattice shape in a top view, and divides the light guide member 10 such that at least one light source unit 20 is included in one light guide portion. In Figure 1 , for example, a planar light source 300 having 4 light guide portions divided into 2 rows and 2 columns along the X direction and the Y direction is shown. Each light guide portion divided by the dividing groove 14 can be set as a light-emitting region 5 that becomes a driving unit for local dimming, for example. It should be noted that the number of light guide portions (light-emitting regions 5) constituting the planar light source 300 is not limited to Figure 1 the number shown.

[0126] Figure 2 It is a schematic cross-sectional view of any two adjacent light guide parts in the planar light source 300, and it is a schematic cross-sectional view along the Figure 1 II-II line shown in the figure.

[0127] One of the two adjacent light guide parts is designated as the first light guide part 10A, and the other is designated as the second light guide part 10B. The light source part 20 includes a first light source 20A disposed on the first light guide part 10A and a second light source 20B disposed on the second light guide part 10B. Hereinafter, the first light guide part 10A and the second light guide part 10B may be simply referred to as light guide parts 10A and 10B, and the first light source 20A and the second light source 20B may be simply referred to as light sources 20A and 20B.

[0128] As shown in Figure 2 the figure, the planar light source 300 includes a light emitting module 100 and a support member 200. The light emitting module 100 includes at least a first light guide part 10A, a second light guide part 10B, a first light source 20A, and a second light source 20B.

[0129] As the material of the light guide parts 10A and 10B, for example, thermoplastic resins such as acrylic, polycarbonate, cyclic polyolefin, polyethylene terephthalate, or polyester, thermosetting resins such as epoxy or silicone, or glass can be used.

[0130] The thickness of the light guide parts 10A and 10B is preferably, for example, 200 μm or more and 800 μm or less. The light guide parts 10A and 10B may be composed of a single layer in the thickness direction, or may be composed of a multilayer laminate. When the light guide parts 10A and 10B are composed of a laminate, a light-transmissive adhesive member may be disposed between the layers. Different types of main materials may also be used for the respective layers of the laminate. As the material of the adhesive member, for example, thermoplastic resins such as acrylic, polycarbonate, cyclic polyolefin, polyethylene terephthalate, or polyester, or thermosetting resins such as epoxy or silicone can be used.

[0131] The first light guide part 10A includes a first A main surface 11A that becomes the light emitting surface of the planar light source 300, and a first B main surface 11B located on the opposite side of the first A main surface 11A. The second light guide part 10B includes a second A main surface 12A that becomes the light emitting surface of the planar light source 300, and a second B main surface 12B located on the opposite side of the second A main surface 12A. Hereinafter, the first A main surface 11A and the second A main surface 12A may be simply referred to as A main surfaces 11A and 12A, and the first B main surface 11B and the second B main surface 12B may be simply referred to as B main surfaces 11B and 12B.

[0132] In addition, the first light guide portion 10A includes a first hole portion 13A for arranging the first light source 20A. The second light guide portion 10B includes a second hole portion 13B for arranging the second light source 20B. The first hole portion 13A is a through hole penetrating from the first main surface 11A to the first main surface 11B. The second hole portion 13B is a through hole penetrating from the second main surface 12A to the second main surface 12B. Hereinafter, the first hole portion 13A and the second hole portion 13B may be simply referred to as hole portions 13A and 13B.

[0133] As Figure 1 shown, the hole portions 13A and 13B can be circular, for example, when viewed from above. In addition, when viewed from above, the hole portions 13A and 13B can be polygons such as ellipses, triangles, quadrilaterals, hexagons, or octagons, for example.

[0134] As Figure 2 shown, the first light guide portion 10A includes a first side surface 15 located between the first main surface 11A and the first main surface 11B. The second light guide portion 10B includes a second side surface 16 located between the second main surface 12A and the second main surface 12B.

[0135] The first side surface 15 includes a first A side surface 15A and a first B side surface 15B. On one side of the second light guide portion 10B, the second side surface 16 includes a second A side surface 16A opposed to the first A side surface 15A and a second B side surface 16B opposed to the first B side surface 15B.

[0136] The first side surface 15 and the second side surface 16 define a dividing groove 14. The dividing groove 14 includes a first groove portion 14a defined by the first B side surface 15B and the second B side surface 16B and a second groove portion 14b defined by the first A side surface 15A and the second A side surface 16A. It should be noted that in the present embodiment, a part of the first groove portion 14a is also defined by a first C side surface 15C and a second C side surface 16C. In addition, the first groove portion 14a and the second groove portion 14b communicate with each other in the thickness direction of the light guide portions 10A and 10B.

[0137] More specifically, the first side surface 15A is continuous with the first main surface 11A, and the first side surface 15B is continuous with the first main surface 11B. There is a step between the first side surface 15A and the first side surface 15B, and the first side surface 15 further includes a first side surface 15C located between the first side surface 15A and the first side surface 15B. In other words, the first side surface 15 of the first light guide portion 10A has a first convex portion 17, and the first convex portion 17 includes a first side surface 15A closer to the second side surface 16 of the second light guide portion 10B than the first side surface 15B and a first side surface 15C. The first convex portion 17 is arranged on the first main surface 11A side such that the surface on the opposite side of the first side surface 15C is flush with the first main surface 11A. The first side surface 15C and the surface on the opposite side of the first side surface 15C in the first convex portion 17 can be, for example, surfaces parallel or inclined to the first main surface 11A respectively.

[0138] In addition, the second side surface 16A is continuous with the second main surface 12A, and the second side surface 16B is continuous with the second main surface 12B. There is a step between the second side surface 16A and the second side surface 16B, and the second side surface 16 further includes a second side surface 16C located between the second side surface 16A and the second side surface 16B. In other words, the second side surface 16 of the second light guide portion 10B has a second convex portion 18, and the second convex portion 18 includes a second side surface 16A closer to the first side surface 15 of the first light guide portion 10A than the second side surface 16B and a second side surface 16C. The second convex portion 18 is arranged on the second main surface 12A side such that the surface on the opposite side of the second side surface 16C is flush with the second main surface 12A. The second side surface 16C and the surface on the opposite side of the second side surface 16C in the second convex portion 18 can be, for example, surfaces parallel or inclined to the second main surface 12A respectively.

[0139] In this way, by opposing the first convex portion 17 including the surface flush with the first main surface 11A and the second convex portion 18 including the surface flush with the second main surface 12A, for example, when the first light guide portion 10A and the second light guide portion 10B are lit simultaneously, on the side of the first main surfaces 11A and 12A, light propagates between the first convex portion 17 and the second convex portion 18, so that the reduction in brightness near the dividing groove 14 can be alleviated.

[0140] The distance between the first side surface 15A and the second side surface 16A is closer than the distance between the first side surface 15B and the second side surface 16B. The distance here represents the shortest distance between the first side surface 15A and the second side surface 16A and the shortest distance between the first side surface 15B and the second side surface 16B. That is, the width (minimum width) of the second groove portion 14b is smaller than the width (minimum width) of the first groove portion 14a.

[0141] The thickness direction of the first light guide part 10A is the direction along the straight line connecting the first main surface 11A and the second main surface 11B at the shortest distance. In the present embodiment, the first main surface 11A and the second main surface 11B are parallel to each other, and the direction perpendicular to these first main surface 11A and second main surface 11B is the thickness direction of the first light guide part 10A, which is set as the Z direction. Similarly, the thickness direction of the second light guide part 10B is the direction along the straight line connecting the second main surface 12A and the second main surface 12B at the shortest distance. In the present embodiment, the second main surface 12A and the second main surface 12B are parallel to each other, and the direction perpendicular to these second main surface 12A and second main surface 12B is the thickness direction of the second light guide part 10B, which is set as the Z direction. The length of the first side surface 15B in the Z direction is longer than the length of the first side surface 15A in the Z direction. The length of the second side surface 16B in the Z direction is longer than the length of the second side surface 16A in the Z direction. That is, the length of the first groove part 14a in the depth direction of the dividing groove 14 is longer than the length of the second groove part 14b in the depth direction of the dividing groove 14.

[0142] The first light source 20A is located on the side of the second main surface 11B of the first light guide part 10A. That is, the distance between the center of the first light source 20A in the thickness direction and the second main surface 11B is shorter than the distance between the center of the first light source 20A in the thickness direction and the first main surface 11A. The positions of the first side surface 15A and the second groove part 14b in the thickness direction of the first light guide part 10A are located above the upper surface of the first light source 20A.

[0143] The second light source 20B is located on the side of the second main surface 12B of the second light guide part 10B. That is, the distance between the center of the second light source 20B in the thickness direction and the second main surface 12B is shorter than the distance between the center of the second light source 20B in the thickness direction and the second main surface 12A. The position of the second side surface 16A in the thickness direction of the second light guide part 10B is located above the upper surface of the second light source 20B.

[0144] A light reflecting member 40 is disposed between the first side surface 15 and the second side surface 16. The light reflecting member 40 is disposed on at least one of the first side surface 15B and the second side surface 16B so as to expose the first side surface 15A and the second side surface 16A. In the present embodiment, the light reflecting member 40 includes a first light reflecting member 40A disposed on the first side surface 15B and a second light reflecting member 40B disposed separately from the first light reflecting member 40A on the second side surface 16B. The first light reflecting member 40A is in contact with the first side surface 15B and covers the first side surface 15B. The second light reflecting member 40B is in contact with the second side surface 16B and covers the second side surface 16B.

[0145] On the first A side surface 15A and the second A side surface 16A, a light reflection member 40 is disposed. The first A side surface 15A and the second A side surface 16A face each other with the second groove portion 14b therebetween, and the inside of the second groove portion 14b is an air layer. Therefore, the first A side surface 15A and the second A side surface 16A are in contact with air. The first A side surface 15A and the second A side surface 16A are not covered by the light reflection member 40 and are exposed from the light reflection member 40.

[0146] Inside the first groove portion 14a, there is an air layer between the first light reflection member 40A disposed on the first B side surface 15B and the second light reflection member 40B disposed on the second B side surface 16B. Therefore, between the first B side surface 15B and the second B side surface 16B, a light reflection member 40 (the first light reflection member 40A and the second light reflection member 40B) and an air layer are disposed. The light reflection member 40 is in contact with air.

[0147] The first light reflection member 40A is also disposed on the first C side surface 15C. The first light reflection member 40A is disposed between the first B side surface 15B and the air layer and between the first C side surface 15C and the air layer. The first light reflection member 40A is in contact with the first C side surface 15C and covers the first C side surface 15C.

[0148] The second light reflection member 40B is also disposed on the second C side surface 16C. The second light reflection member 40B is disposed between the second B side surface 16B and the air layer and between the second C side surface 16C and the air layer. The second light reflection member 40B is in contact with the second C side surface 16C and covers the second C side surface 16C.

[0149] In Figure 2 In the example shown, the light reflection member 40 is disposed on both the first B side surface 15B and the second B side surface 16B. Alternatively, the first light reflection member 40A may be disposed on the first B side surface 15B and the second light reflection member 40B may not be disposed on the second B side surface 16B. Conversely, the second light reflection member 40B may be disposed on the second B side surface 16B and the first light reflection member 40A may not be disposed on the first B side surface 15B. Additionally, the inside of the first groove portion 14a may be filled with the light reflection member 40 in a manner that is in contact with the first B side surface 15B and the second B side surface 16B.

[0150] As the light reflection member 40 (the first light reflection member 40A and the second light reflection member 40B), for example, a resin member containing a light diffusing agent can be used. As the light diffusing agent, for example, particles of TiO 2 can be cited. Additionally, as the light diffusing agent, Nb 2 O 5 , BaTiO 3 , Ta 2 O 5, Zr 2 O 3 , ZnO, Y 2 O 3 , Al 2 O 3 , MgO or BaSO 4 and other particles. Additionally, as the light reflection member 40, for example, metal members such as Al or Ag can also be used.

[0151] The light-emitting module 100 opposes the first main surface 11B and the second main surface 12B to the upper surface of the support member 200, and is disposed on the support member 200. The upper surface of the support member 200 is exposed from the light guide portions 10A and 10B, for example, at the bottom of the dividing groove 14.

[0152] The first light source 20A is disposed on the support member 200 within the first hole portion 13A of the first light guide portion 10A. The second light source 20B is disposed on the support member 200 within the second hole portion 13B of the second light guide portion 10B. It should be noted that on one light guide portion 10A (10B), it is not limited to disposing one light source 20A (20B), and multiple light sources can also be disposed.

[0153] Figure 3A is a schematic top view of an example of the light sources 20A and 20B. It should be noted that in Figure 3A , the light-emitting elements 21 and the electrodes 23 covered and hidden by the first light adjustment member 25 and the first light-transmitting member 22, etc. are indicated by dashed lines.

[0154] Figure 3B is a schematic bottom view of an example of the light sources 20A and 20B.

[0155] Figure 3C is a schematic cross-sectional view along the Figure 3A IIIC - IIIC line.

[0156] Figure 3D is a schematic cross-sectional view along the Figure 3A IIID - IIID line. The first light source 20A and the second light source 20B have the same structure.

[0157] The light sources 20A and 20B can be single light-emitting elements, or can have a structure in which, for example, a light-transmitting member is combined with the light-emitting element. In the present embodiment, as Figures 3A to 3DAs shown, the light sources 20A and 20B include a light-emitting element 21, a first light-transmissive member 22, an electrode 23, a covering member 24, and a first light adjustment member 25. Additionally, the light sources 20A and 20B may include only one of the covering member 24 and the first light adjustment member 25 according to the desired light distribution. For example, the first light adjustment member 25 is not disposed above the first light-transmissive member 22. In other words, the upper surfaces of the light sources 20A and 20B can be respectively constituted by the upper surfaces of the first light-transmissive member 22. Further, the covering member 24 is not disposed below the first light-transmissive member 22. In other words, the lower surfaces of the light sources 20A and 20B can be respectively constituted by the lower surface of the first light-transmissive member 22 and the lower surface of the light-emitting element 21.

[0158] The light-emitting element 21 includes a semiconductor laminate. The semiconductor laminate includes, for example, a support substrate such as sapphire or gallium nitride, an n-type semiconductor layer and a p-type semiconductor layer disposed on the support substrate, a light-emitting layer sandwiched therebetween, an n-side electrode and a p-side electrode electrically connected to the n-type semiconductor layer and the p-type semiconductor layer, respectively. It should be noted that a semiconductor laminate without a support substrate may also be used. In addition, as the structure of the light-emitting layer, it may be a structure having a single active layer such as a double heterostructure or a single quantum well structure (SQW), or a structure having a set of active layer groups such as a multi-quantum well structure (MQW). The light-emitting layer can emit visible light or ultraviolet light. The light-emitting layer can emit light from blue to red as visible light. As a semiconductor laminate including such a light-emitting layer, for example, it may include In x Al y Ga 1-x-y N (0 ≤ x, 0 ≤ y, x + y ≤ 1). The semiconductor laminate may include at least one of the above-described light-emitting layers capable of emitting light. For example, the semiconductor laminate may be a structure including one or more light-emitting layers between an n-type semiconductor layer and a p-type semiconductor layer, or a structure in which the structure including an n-type semiconductor layer, a light-emitting layer, and a p-type semiconductor layer in this order is repeated multiple times. When the semiconductor laminate includes a plurality of light-emitting layers, it may include light-emitting layers having different emission peak wavelengths, or may include light-emitting layers having the same emission peak wavelength. It should be noted that the so-called emission peak wavelengths being the same may have a deviation of about several nm, for example. As a combination of such light-emitting layers, it can be appropriately selected. For example, when the semiconductor laminate includes two light-emitting layers, the light-emitting layers can be selected by combinations such as blue light and blue light, green light and green light, red light and red light, ultraviolet light and ultraviolet light, blue light and green light, blue light and red light, or green light and red light. In addition, the light-emitting layer may include a plurality of active layers having different emission peak wavelengths, or may include a plurality of active layers having the same emission peak wavelength.

[0159] The first light transmissive member 22 covers the upper surface and the side surfaces of the light emitting element 21. As Figure 3D shown, the distance d1 from the side surface of the light emitting element 21 to the side surface of the first light transmissive member 22 may also be longer than the distance d2 from the upper surface of the light emitting element 21 to the upper surface of the first light transmissive member 22. Thus, the light emitted from the side surface of the light emitting element 21 is more likely to propagate toward the side surface than the upper surface side of the first light transmissive member 22, and the proportion of the light taken out from the sides of the light sources 20A and 20B increases. Therefore, the proportion of the light incident on the light guide member 10 can be increased. It should be noted that the distance d1 from the side surface of the light emitting element 21 to the side surface of the first light transmissive member 22 is preferably a distance about 1.5 times or more and 2.5 times or less the distance d2 from the upper surface of the light emitting element 21 to the upper surface of the first light transmissive member 22, and more preferably the distance d1 is about 2 times the distance d2. In addition, the first light transmissive member 22 protects the light emitting element 21 and has functions such as wavelength conversion and light diffusion according to the particles added to the first light transmissive member 22. Specifically, the first light transmissive member 22 includes a light transmissive resin and may also include a phosphor. As the light transmissive resin, for example, silicone resin or epoxy resin can be used. In addition, as the phosphor, yttrium aluminum garnet-based phosphors (for example, Y 3 (Al, Ga) 5 O 12 : Ce), lutetium aluminum garnet-based phosphors (for example, Lu 3 (Al, Ga) 5 O 12 : Ce), terbium aluminum garnet-based phosphors (for example, Tb 3 (Al, Ga) 5 O 12 : Ce), β-sialon-based phosphors (for example, (Si, Al) 3 (O, N) 4 : Eu), α-sialon-based phosphors (for example, Mz(Si, Al) 12 (O, N) 16 : Eu (where 0 < z ≤ 2, and M is a lanthanide element other than Li, Mg, Ca, Y, La, and Ce)), CASN-based phosphors (for example, CaAlSiN 3 : Eu) or SCASN-based phosphors (for example, (Sr, Ca)AlSiN 3 : Eu) and other nitride-based phosphors, KSF-based phosphors (for example, K 2 SiF 6 : Mn), KSAF-based phosphors (for example, K 2 (Si, Al)F 6 : Mn) or MGF-based phosphors (for example, 3.5MgO·0.5MgF 2 ·GeO2 : Fluoride-based phosphors such as Mn), phosphors having a perovskite structure (e.g., CsPb(F, Cl, Br, I) 3 ) or quantum dot phosphors (e.g., CdSe, InP, AgInS 2 or AgInSe 2 ), etc. As the phosphor added to the first light-transmitting member 22, one phosphor or a plurality of phosphors can be used.

[0160] As the KSAF-based phosphor, it can have a composition represented by the following formula (I).

[0161] M 2 [Si p Al q Mn r F s (I)

[0162] In formula (I), M represents an alkali metal and can contain at least K. Mn can be tetravalent Mn ions. p, q, r, and s can satisfy 0.9 ≤ p + q + r ≤ 1.1, 0 < q ≤ 0.1, 0 < r ≤ 0.2, 5.9 ≤ s ≤ 6.1. Preferably, it can be 0.95 ≤ p + q + r ≤ 1.05 or 0.97 ≤ p + q + r ≤ 1.03, 0 < q ≤ 0.03, 0.002 ≤ q ≤ 0.02 or 0.003 ≤ q ≤ 0.015, 0.005 ≤ r ≤ 0.15, 0.01 ≤ r ≤ 0.12 or 0.015 ≤ r ≤ 0.1, 5.92 ≤ s ≤ 6.05 or 5.95 ≤ s ≤ 6.025. For example, it can be exemplified by K 2 [Si 0.946 Al 0.005 Mn 0.049 F 5.995 , K 2 [Si 0.942 Al 0.008 Mn 0.050 F 5.992 , K 2 [Si 0.939 Al 0.014 Mn 0.047 F 5.986 represents the composition. According to such a KSAF-based phosphor, high-brightness red light emission with a narrow half-value width of the emission peak wavelength can be obtained.

[0163] Alternatively, a wavelength conversion sheet containing the above phosphor can be disposed on a planar light source. The wavelength conversion sheet can be a planar light source that absorbs a part of the blue light from the light source, emits yellow light, green light, and / or red light, and emits white light. For example, a white light can be obtained by combining a light source capable of emitting blue light and a wavelength conversion sheet containing a phosphor capable of emitting yellow light. Alternatively, a light source capable of emitting blue light and a wavelength conversion sheet containing a red phosphor and a green phosphor can be combined. Alternatively, a light source capable of emitting blue light and a plurality of wavelength conversion sheets can be combined. As the plurality of wavelength conversion sheets, for example, a wavelength conversion sheet containing a phosphor capable of emitting red light and a wavelength conversion sheet containing a phosphor capable of emitting green light can be selected. Alternatively, a light source having a light-emitting element capable of emitting blue light, a light-transmitting member containing a phosphor capable of emitting red light, and a wavelength conversion sheet containing a phosphor capable of emitting green light can be combined.

[0164] The covering member 24 is disposed at least on the lower surface of the light-emitting element 21. The covering member 24 is disposed such that the lower surfaces of the electrodes 23 respectively connected to the p-side electrode and the n-side electrode of the light-emitting element 21 (as Figure 3B shown) are exposed from the covering member 24. The covering member 24 is also disposed on the lower surface of the first light-transmitting member 22 that covers the side surface of the light-emitting element 21. The covering member 24 in the present embodiment has a uniform thickness from the lower surface of the light-emitting element 21 to the lower surface of the first light-transmitting member 22. Alternatively, the covering member 24 can be disposed, for example, so as to become thicker as it approaches the electrode 23.

[0165] The covering member 24 is reflective of the light emitted by the light sources 20A and 20B. The covering member 24 is, for example, a resin member containing a light diffusing agent. Specifically, the covering member 24 is a silicone resin, an epoxy resin, or an acrylic resin containing particles composed of TiO 2 , SiO 2 , Al 2 O 3 , ZnO, or glass as a light diffusing agent.

[0166] The first light adjustment member 25 is disposed on the upper surface of the first light transmissive member 22, and controls the amount and emission direction of the light emitted from the upper surface of the first light transmissive member 22. The first light adjustment member 25 has reflectivity and light transmissivity with respect to the light emitted from the light sources 20A and 20B. A part of the light emitted from the upper surface of the first light transmissive member 22 is reflected by the first light adjustment member 25, and the other part passes through the first light adjustment member 25. The transmittance of the first light adjustment member 25 is preferably, for example, 1% or more and 50% or less, and more preferably 3% or more and 30% or less. Thereby, the brightness directly above the light sources 20A and 20B is reduced, and the in-plane deviation of the brightness of the planar light source 300 is reduced. The first light adjustment member 25 may be composed of a light transmissive resin and a light diffusing agent contained in the light transmissive resin. The light transmissive resin is, for example, a silicone resin, an epoxy resin, or an acrylic resin. Examples of the light diffusing agent include particles such as TiO2, SiO2, Al2O3, ZnO, or glass. The first light adjustment member 25 may be, for example, a metal member such as Al or Ag or a dielectric multilayer film.

[0167] As Figure 2 shown, the light emitting module 100 can further include a second light transmissive member 71, a wavelength conversion member 72, a third light transmissive member 73, and a second light adjustment member 74.

[0168] The second light transmissive member 71, the wavelength conversion member 72, and the third light transmissive member 73 are respectively disposed in the hole portions 13A and 13B of the light guide portions 10A and 10B.

[0169] The second light transmissive member 71 and the third light transmissive member 73 have light transmissivity with respect to the light emitted from the light sources 20A and 20B, and for example, a resin having the same material as that of the light guide portions 10A and 10B or a resin having a small refractive index difference from the material of the light guide portions 10A and 10B can be used.

[0170] The second light transmissive member 71 is disposed between the side surfaces of the light sources 20A and 20B and the side surfaces of the hole portions 13A and 13B. Preferably, the second light transmissive member 71 is disposed such that no space such as an air layer is formed between the side surfaces of the light sources 20A and 20B and the second light transmissive member 71 and between the side surfaces of the holes 13A and 13B and the second light transmissive member 71. Thereby, the light from the light sources 20A and 20B can be easily guided by the light guide portions 10A and 10B.

[0171] The wavelength conversion member 72 covers the upper surfaces of the light sources 20A and 20B. The wavelength conversion member 72 also covers the upper surface of the second light transmissive member 71. The wavelength conversion member 72 is a light transmissive resin member containing a phosphor for color adjustment of the light sources 20A and 20B.

[0172] The third light-transmissive member 73 covers the upper surface of the wavelength conversion member 72. The upper surface of the third light-transmissive member 73 may be a flat surface. Alternatively, the upper surface of the third light-transmissive member 73 may be a concave or convex curved surface.

[0173] The second light adjustment member 74 is disposed on the third light-transmissive member 73. The second light adjustment member 74 has reflectivity and light transmissivity with respect to the light emitted from the light sources 20A and 20B. The second light adjustment member 74 may be composed of a light-transmissive resin and a light diffusing agent contained in the light-transmissive resin. The light-transmissive resin is, for example, silicone resin, epoxy resin, or acrylic resin. Examples of the light diffusing agent include particles such as TiO 2 , SiO 2 , Al 2 O 3 , ZnO, or glass. The second light adjustment member 74 may be disposed so as to cover all or part of the upper surface of the third light-transmissive member 73. In addition, the second light adjustment member 74 can extend above the upper surface of the third light-transmissive member 73 and the A main surfaces 11A and 12A of the light guide portions 10A and 10B in the periphery thereof.

[0174] As Figure 1 shown, the second light adjustment member 74 is disposed at a position that overlaps with the light sources 20A and 20B in a top view. In Figure 1 the example shown, the second light adjustment member 74 is a quadrilateral that is larger than the quadrilateral light sources 20A and 20B in a top view. The second light adjustment member 74 may be formed into a shape such as a circle, a triangle, a hexagon, or an octagon in a top view.

[0175] The first light adjustment member 25 reflects a part of the light emitted in the direction directly above the light sources 20A and 20B and transmits the other part. Thereby, in the A main surfaces 11A and 12A that are the light emitting surfaces (light emitting surfaces) of the planar light source 300, it is possible to suppress the brightness of the region directly above the light sources 20A and 20B from becoming extremely higher than the brightness of other regions. That is, it is possible to reduce the brightness unevenness of the light emitted from one of the light guide portions 10A and 10B divided by the dividing groove 14.

[0176] The thickness of the second light adjustment member 74 is preferably 0.005 mm or more and 0.2 mm or less, and more preferably 0.01 mm or more and 0.075 mm or less. In addition, as the reflectivity of the second light adjustment member 74, it is preferably set to be lower than the reflectivity of the first light adjustment member 25, and is preferably 20% or more and 90% or less, and more preferably 30% or more and 85% or less with respect to the light from the light sources 20A and 20B.

[0177] Between the second light adjustment member 74 and the first light adjustment member 25, a third light transmissive member 73 is disposed. The third light transmissive member 73 has a higher light transmittance for the light emitted by the light sources 20A and 20B than the first light adjustment member 25 and the second light adjustment member 74. The light transmittance of the third light transmissive member 73 for the light emitted by the light sources 20A and 20B can be set to be 2 times or more and 100 times or less the light transmittance of the first light adjustment member 25 and the light transmittance of the second light adjustment member 74 within the range of 100% or less. Thereby, the region directly above the light sources 20A and 20B does not become too bright or too dark, and as a result, the brightness unevenness within the light emitting surfaces of the light guide portions 10A and 10B can be reduced.

[0178] In the hole portions 13A and 13B, the wavelength conversion member 72 and the third light transmissive member 73 may not be disposed, and the second light transmissive member 71 may be disposed in a single layer. In this case, the second light adjustment member 74 is disposed on the second light transmissive member 71. Alternatively, the second light transmissive member 71 itself may contain a phosphor and function as a wavelength conversion member.

[0179] The support member 200 includes a wiring substrate 50, a first adhesive member 41, a third light reflecting member 42, and a second adhesive member 43. On the wiring substrate 50, the first adhesive member 41, the third light reflecting member 42, and the second adhesive member 43 are sequentially disposed.

[0180] The first adhesive member 41 is disposed between the wiring substrate 50 and the third light reflecting member 42 to bond the wiring substrate 50 and the third light reflecting member 42. The second adhesive member 43 is disposed between the third light reflecting member 42 and the B main surfaces 11B and 12B of the light guide portions 10A and 10B to bond the third light reflecting member 42 and the light guide portions 10A and 10B.

[0181] The first light source 20A is disposed on the second adhesive member 43 within the first hole portion 13A. The second light source 20B is disposed on the second adhesive member 43 within the second hole portion 13B.

[0182] The second adhesive member 43 is light transmissive to the light emitted by the light sources 20A and 20B. Examples of the first adhesive member 41 and the second adhesive member 43 may include epoxy resin, acrylic resin, or cyclic olefin resin.

[0183] The third light reflecting member 42 is disposed below the B main surfaces 11B and 12B of the light guide portions 10A and 10B, below the light sources 20A and 20B, and below the dividing groove 14. That is, the third light reflecting member 42 is disposed on the entire lower surface of the light emitting module 100.

[0184] The third light reflection member 42 is reflective of the light emitted from the light sources 20A and 20B. For the third light reflection member 42, for example, a resin member containing a plurality of air bubbles or a resin member containing a light diffusing agent can be used. The material of the resin member is, for example, polyethylene terephthalate (PET) resin, cyclic olefin resin, acrylic resin, silicone resin, polyurethane resin, or epoxy resin, etc. As the light diffusing agent, for example, SiO 2 、CaF 2 、MgF 2 、TiO 2 、Nb 2 O 5 、BaTiO 3 、Ta 2 O 5 、Zr 2 O 3 、ZnO、Y 2 O 2 、Al 2 O 3 、MgO or BaSO 4 etc.

[0185] The wiring substrate 50 includes an insulating substrate and at least one wiring layer. On the back surface of the wiring substrate 50, which is opposite to the surface on which the first bonding member 41 is disposed, a connection portion 51a, which is a part of the wiring layer, is disposed. In addition, the back surface of the wiring substrate 50 is covered with an insulating film 52. The connection portion 51a is not covered by the insulating film 52 and is exposed from the insulating film 52.

[0186] In the support member 200, below the light sources 20A and 20B, a connection portion 61 is disposed. At least a part of the electrodes 23 of the light sources 20A and 20B is disposed above the connection member 61 and is connected to the connection member 61.

[0187] The connection member 61 penetrates between the second bonding member 43 and the insulating film 52, and further extends from the penetration portion to the connection portion 51a disposed on the back surface of the wiring substrate 50. The connection member 61 has conductivity and electrically connects the electrodes 23 of the light sources 20A and 20B and the connection portion 51a. The connection member 61 is, for example, a conductive paste in which conductive fillers are dispersed in an adhesive resin. The connection member 61 may contain, for example, a metal such as copper or silver as the filler. The filler is in the form of particles or flakes.

[0188] Each of the light sources 20A and 20B includes a pair of positive and negative electrodes 23. The connecting member 61 connected to the positive-side electrode 23 and the connecting member 61 connected to the negative-side electrode 23 are separated and not electrically connected. On the surface of the insulating film 52, an insulating film 53 is disposed so as to cover the connecting member 61. The insulating film 53 is formed so as to cover between the pair of connecting members 61 corresponding to the pair of positive and negative electrodes 23, improving the insulation between the pair of connecting members 61 of positive and negative.

[0189] In the planar light source 300 of the embodiment configured in the above-described manner, the light guided in the light guide portions 10A and 10B toward the B main surfaces 11B and 12B is reflected by the third light reflection member 42 to the A main surfaces 11A and 12A which are the light emitting surfaces of the planar light source 300, and the luminance of the light extracted from the A main surfaces 11A and 12A can be improved.

[0190] In the region between the third light reflection member 42 and the A main surfaces 11A and 12A, total reflection is repeatedly performed by the third light reflection member 42 and the A main surfaces 11A and 12A, and the light from the light sources 20A and 20B is guided in the light guide portions 10A and 10B toward the dividing groove 14. A part of the light toward the A main surfaces 11A and 12A is extracted from the A main surfaces 11A and 12A to the outside of the light guide portions 10A and 10B.

[0191] The light reflection members 40 disposed on the first side surface 15 and the second side surface 16 constituting the dividing groove 14 suppress the propagation of light between the adjacent light guide portions 10A and 10B. For example, the propagation of light from the light guide portion 10A (or 10B) in the light emitting state to the light guide portion 10B (or 10A) in the non-light emitting state is suppressed. Thereby, local dimming can be performed with each of the light guide portions 10A and 10B divided by the dividing groove 14 as a driving unit.

[0192] In the present embodiment, since the light reflection member 40 contains a light diffusing agent, the light reaching the light reflection member 40 from the light sources 20A and 20B is diffusely reflected, and the light is also extracted upward. Therefore, the luminance in the vicinity of the first side surface 15 and the second side surface 16 far from the light sources 20A and 20B can be improved.

[0193] In particular, the light reflection members 40 disposed on the first C side surface 15C and the second C side surface 16C are disposed so as to face the A main surfaces 11A and 12A at positions closer to the A main surfaces 11A and 12A than the B main surfaces 11B and 12B. Therefore, the light emission amount upward can be increased by the light reflection members 40 disposed on the first C side surface 15C and the second C side surface 16C.

[0194] The first side surface 15 has a first A side surface 15A where the light reflection member 40 is not disposed, and the second side surface 16 has a second A side surface 16A where the light reflection member 40 is not disposed. Therefore, when both the first light guide portion 10A and the second light guide portion 10B are lit simultaneously, light can be propagated between the first A side surface 15A and the second A side surface 16A, and the dark portion (dark line) in the boundary (partition groove 14) between the first light guide portion 10A and the second light guide portion 10B can be suppressed. The distance between the first A side surface 15A and the second A side surface 16A is closer than the distance between the first B side surface 15B and the second B side surface 16B. Therefore, it is easy for light to propagate between the first A side surface 15A and the second A side surface 16A.

[0195] According to the present embodiment, by the cross-sectional shape of the partition groove 14, the allocation ratio of the portions where the light reflection member 40 is disposed and the portions where the light reflection member 40 is not disposed in the first side surface 15 and the second side surface 16, etc., the amount of light propagated between the adjacent light guide portions 10A and 10B divided by the partition groove 14 can be adjusted. In addition, the reduction in brightness that may occur between the light guide portions 10A and 10B can be alleviated.

[0196] For example, in the Z direction, the length of the first B side surface 15B where the first light reflection member 40A is disposed is longer than the length of the first A side surface 15A. Further, in the Z direction, the length of the second B side surface 16B where the second light reflection member 40B is disposed is longer than the length of the second A side surface 16A. Thereby, the effect of suppressing the propagation of light from the light guide portion 10A (or 10B) in the light-emitting state to the light guide portion 10B (or 10A) in the non-light-emitting state can be improved.

[0197] Next, with reference to Figures 4 to 20 , a method for manufacturing the planar light source 300 will be described.

[0198] The manufacturing method of the planar light source 300 according to the embodiment includes a step of preparing Figure 8 the structure 101 shown. The step of preparing the structure 101 includes a step of preparing Figure 4 the light guide plate 110 shown. The light guide plate 110 includes a first main surface 110A and a second main surface 110B located on the opposite side of the first main surface 110A. In addition, Figure 8 the structure 101 shown in

[0199] As shown in Figure 5 , a first hole portion 13A and a second hole portion 13B are formed in the light guide plate 110. The first hole portion 13A and the second hole portion 13B are formed as through holes penetrating the light guide plate 110 by, for example, drilling, punching, or laser processing.

[0200] As shown in Figure 6As shown, a first groove portion 14a is also formed on the light guide plate 110. The first groove portion 14a is formed as a bottomed groove that opens on the side of the second main surface 110B. The depth of the first groove portion 14a is greater than the distance between the bottom surface of the first groove portion 14a and the first main surface 110A. The first groove portion 14a is formed, for example, by cutting or laser processing.

[0201] As Figure 7 shown, the light reflecting member 40 is formed on the bottom surface and the side surface of the first groove portion 14a. The light reflecting member 40 is formed, for example, by methods such as printing, casting, or spraying. In the present embodiment, the light reflecting member 40 does not fill the inside of the first groove portion 14a, and a space is left inside the light reflecting member 40 in the first groove portion 14a.

[0202] As Figure 8 shown, the light guide plate 110 is cut into a desired planar size to obtain the structure 101.

[0203] The manufacturing method of the planar light source 300 of the present embodiment includes a process of preparing Figure 11 the support member 200 shown. The process of preparing the support member 200 includes a process of preparing Figure 9 the wiring board 50 shown. On the back surface of the wiring board 50, a connection portion 51a and an insulating film 52 are disposed. The connection portion 51a is disposed in an opening formed in the insulating film 52 and is exposed from the insulating film 52. In addition, Figure 11 the support member 200 shown in

[0204] As Figure 10 shown, on the surface of the wiring board 50 opposite to the surface on which the connection portion 51a is disposed, a first adhesive member 41, a third light reflecting member 42, and a second adhesive member 43 are laminated.

[0205] As Figure 11 shown, a connection hole 201 is formed through the second adhesive member 43, the third light reflecting member 42, the first adhesive member 41, the wiring board 50, and the insulating film 52 to obtain the support member 200. The connection hole 201 is formed, for example, by punching, drilling, or laser processing. The shape of the connection hole 201 in a top view is circular. The shape of the connection hole 201 in a top view may be an elliptical shape or a polygonal shape in addition to the circular shape. The connection hole 201 is disposed such that one of the positive and negative pair of electrodes 23 in the light sources 20A and 20B (for example, the positive electrode) faces one connection hole 201, and the other electrode (for example, the negative electrode) faces one connection hole 201. At this time, the size of one connection hole 201 in a top view only needs to be such that at least a part of the lower surface of one electrode 23 is exposed from the wiring board 50. In other words, in a top view, one electrode 23 overlaps with one connection hole 201.

[0206] As shown in Figure 12 FIG. 4, the structure 101 is disposed on the support member 200. The second main surface 110B of the light guide plate 110 is bonded to the second bonding member 43 of the support member 200. The connection holes 201 formed in the support member 200 are disposed and communicated so as to overlap with the first hole portion 13A and the second hole portion 13B formed in the light guide plate 110. Two connection holes 201 overlap with one first hole portion 13A, and two connection holes 201 overlap with one second hole portion 13B. The opening of the first groove portion 14a faces the second bonding member 43 forming the upper surface of the support member 200. The first groove portion 14a is located between the first main surface 110A of the light guide plate 110 and the upper surface of the support member 200.

[0207] After the structure 101 is disposed on the support member 200, the portion of the light guide plate 110 connected above the first groove portion 14a is cut. At this time, the portion of the light reflection member 40 connected in the first groove portion 14a is also cut. For example, a cutting tool such as a pull-cutting type or press-cutting type tool, or a laser is used to cut the light guide plate 110 and the light reflection member 40. When cutting the light guide plate 110 and the light reflection member 40 in this way, the support member 200 may not be cut as in the present embodiment, or a part of the support member 200 may be cut. In the case of cutting a part of the support member 200, a groove portion (hereinafter, referred to as the third groove portion) extending along the first groove portion 14a is disposed on the upper surface of the support member 200 in a plan view. Through this third groove portion, warping of the support member 200 due to differences in the thermal expansion coefficients of the respective members constituting the support member 200 during heat treatment (for example, heat treatment performed after disposing the structure 101 on the support member 200) can be suppressed, and cracking in the connection member 61 can be suppressed. Note that, when cutting a part of the support member 200, it is sufficient to cut at an arbitrary depth without cutting the wiring layer of the wiring substrate 50 included in the support member 200. More specifically, at least a part of the second bonding member 43 is cut. In addition, at least a part of the second bonding member 43 and the third light reflection member 42 may be cut. In addition, at least a part of the second bonding member 43, the third light reflection member 42, and the first bonding member 41 may be cut. In other words, the depth of the third groove portion can be appropriately set to a depth at which the first bonding member 41, the third light reflection member 42, or the second bonding member 43 becomes the bottom surface of the third groove portion.

[0208] This embodiment is as shown in Figure 13As shown, above the first groove portion 14a, a second groove portion 14b communicating with the first groove portion 14a is formed, and a dividing groove 14 composed of the first groove portion 14a and the second groove portion 14b is formed. The light guide plate 110 is separated into a first light guide portion 10A and a second light guide portion 10B by the dividing groove 14.

[0209] Due to the difference in the coefficient of thermal expansion between the light guide plate 110 and the wiring substrate 50, warpage may occur in the light guide plate 110 during the heat treatment performed after the structure 101 is disposed on the support member 200. According to the present embodiment, by completely separating the light guide plate 110 into a plurality of light guide portions 10A and 10B, compared with the case where the light guide plate 110 is connected at the position of the dividing groove 14, warpage generated by the subsequent heat treatment can be suppressed.

[0210] In addition, after the Figure 5 process, when the light guide plate 110 is disposed on the support member 200 and the dividing groove 14 is formed on the light guide plate 110 in a state supported by the support member 200, due to the deviation in the thickness of the support member 200 or the like, the wiring layer of the wiring substrate 50 may be cut off. According to the present embodiment, after the light guide plate 110 having the first groove portion 14a formed therein is disposed on the support member 200, the portion of the light guide plate 110 connected above the first groove portion 14a is cut off. Therefore, it is difficult to cut off the wiring layer of the wiring substrate 50 when forming the first groove portion 14a and the second groove portion 14b.

[0211] In addition, before the light guide plate 110 is disposed on the support member 200, if the light guide plate 110 is separated into a plurality of light guide portions 10A and 10B by the dividing groove 14, then each of the separated light guide portions 10A and 10B is disposed on the support member 200.

[0212] In contrast, according to the present embodiment, when the light guide plate 110 is disposed on the support member 200, the light guide plate 110 is not separated but in a connected state. Therefore, a plurality of light guide portions 10A and 10B are disposed on the support member 200 in batches, and the number of processes can be reduced.

[0213] After the light guide plate 110 is separated into a plurality of light guide portions 10A and 10B, as Figure 14 shown, light sources 20A and 20B are disposed in the hole portions 13A and 13B. For example, the lower surface of the covering member 24, which is the lower surface of the light sources 20A and 20B, is bonded to the upper surface of the second bonding member 43 exposed in the hole portions 13A and 13B. The electrodes 23 of the light sources 20A and 20B are positioned in the connection holes 201 formed in the support member 200. At least a part of the lower surface of the electrode 23 is exposed from the support member 200 through the connection hole 201.

[0214] After the light sources 20A and 20B are disposed in the hole portions 13A and 13B, as Figure 15 shown, a second light transmissive member 71 is formed in the hole portions 13A and 13B. The second light transmissive member 71 is formed between the side surfaces of the light sources 20A and 20B and the side surfaces of the hole portions 13A and 13B. The upper surfaces of the light sources 20A and 20B are exposed from the second light transmissive member 71. For example, after a liquid light transmissive resin is supplied into the hole portions 13A and 13B, it is cured by heating to form the second light transmissive member 71. The light sources 20A and 20B are fixed to the light guide portions 10A and 10B via the second light transmissive member 71.

[0215] After the second light transmissive member 71 is formed, a connection member 61 is formed in the connection hole 201. After, for example, a conductive paste is supplied into the connection hole 201, it is thermally cured to form, as Figure 16 shown, the connection member 61 connected to the electrodes 23 of the light sources 20A and 20B. The connection member 61 is also formed on the back surface of the wiring substrate 50 and is connected to the connection portion 51a of the wiring layer.

[0216] When curing the conductive paste, it is preferable to cure it while applying pressure. Thereby, generation of air bubbles in the connection member 61 can be suppressed. For example, by curing the air bubbles that enter the conductive paste when the conductive paste is supplied into the connection hole 201 while applying pressure to the conductive paste, the air bubbles can be discharged to the outside of the conductive paste. By suppressing the generation of air bubbles in the connection member 61, the reliability of the connection member 61 in electrical connection is improved. In addition, by curing the air bubbles located between the first adhesive member, the second adhesive member, and / or the third light reflection member and the conductive paste while applying pressure to the conductive paste, the air bubbles can be discharged to the outside via the conductive paste. Thereby, the close contact between the connection member 61 and the first adhesive member, the second adhesive member, and / or the third light reflection member can be improved. When the first adhesive member and / or the second adhesive member contain air bubbles before curing the conductive paste, by curing while applying pressure to the conductive paste, the air bubbles can be discharged to the outside via the conductive paste. Thereby, it is easy to improve the adhesive force of the first adhesive member and / or the second adhesive member. When the conductive paste contains metal particles and resin, by curing while applying pressure to the conductive paste, the volume of the resin can be reduced. Thereby, the ratio of the metal particles to the volume of the connection member 61 can be increased, and thus the reliability of the connection member 61 in electrical connection is improved. It should be noted that generally, the volume of metal particles is less likely to change due to pressure compared to resin. It is also possible to form a depression on the surface of the connection member 61 on the opposite side of the light guide member due to the reduction in the volume of the resin contained in the conductive paste. The temperature for curing the conductive paste is not particularly limited. The temperature for curing the conductive paste is preferably, for example, 40°C or higher and 130°C or lower. The pressure for curing the conductive paste is not particularly limited. The pressure for curing the conductive paste is preferably, for example, 0.15 MPa or higher and 1 MPa or lower. The conductive paste preferably contains an organic solvent. When curing the conductive paste, the air bubbles in the conductive paste can be easily discharged to the outside of the conductive paste through the volatilized organic solvent. The amount of the solvent contained in the conductive paste is not particularly limited. The amount of the solvent contained in the conductive paste is preferably, for example, 0.1 wt% or higher and 10 wt% or lower. The material of the organic solvent contained in the conductive paste is not particularly limited. As the material of the organic solvent contained in the conductive paste, known materials such as methanol, ethanol, propylene glycol monomethyl ether, propylene glycol monoethyl ether, dipropylene glycol monomethyl ether, cyclopentanone, cyclohexanone, and γ-butyrolactone can be used.

[0217] After forming the connection member 61, as Figure 17 shown, on the light sources 20A, 20B in the holes 13A, 13B and on the second light transmissive member 71, a wavelength conversion member 72 is formed. For example, after supplying a liquid resin containing a phosphor into the hole portions 13A, 13B, it is thermally cured to form the wavelength conversion member 72.

[0218] After forming the wavelength conversion member 72, as Figure 18As shown, a third light-transmissive member 73 is formed on the wavelength conversion members 72 within the hole portions 13A and 13B. For example, after supplying a liquid resin onto the conversion member 72, the third light-transmissive member 73 is formed by thermally curing it.

[0219] After forming the third light-transmissive member 73, as Figure 19 shown, a second light adjustment member 74 is formed on the third light-transmissive member 73. For example, after supplying a liquid resin containing a light diffusing agent onto the third light-transmissive member 73, the second light adjustment member 74 is formed by thermally curing it.

[0220] When forming the above-described second light-transmissive member 71, connection member 61, wavelength conversion member 72, third light-transmissive member 73, and second light adjustment member 74 respectively, since the light guide portions 10A and 10B are separated by the dividing groove 14, warping of the light guide portions 10A and 10B caused by heat treatment can be suppressed.

[0221] After forming the second light adjustment member 74, as Figure 20 shown, an insulating film 53 is formed on the lower surface of the support member 200 so as to cover the connection member 61. The insulating film 53 is formed by methods such as printing, casting, spraying, inkjet, and bonding of a resin sheet, for example. After that, the support member 200 is cut into a desired planar size to obtain Figure 2 the planar light source 300 shown.

[0222] [Second Embodiment]

[0223] Figure 21 is a schematic cross-sectional view of a planar light source according to a second embodiment of the present invention.

[0224] It should be noted that Figure 21 the first light guide portion 10A, the first main surface 11A, the first main surface 11B, the first side surface 15, the first side surface 15A, the first side surface 15B, the first side surface 15C, the first light reflection member 40A, the first hole portion 13A, and the first light source 20A shown can be replaced with the second light guide portion 10B, the second main surface 12A, the second main surface 12B, the second side surface 16, the second side surface 16A, the second side surface 16B, the second side surface 16C, the second light reflection member 40B, the second hole portion 13B, and the second light source 20B, respectively.

[0225] In the second embodiment, the structures of the first side surface 15 of the first light guide portion 10A and the second side surface 16 of the second light guide portion 10B are also the same as those in the first embodiment, and a reduction in brightness that may occur between adjacent light guide portions 10A and 10B divided by the dividing groove 14 can be alleviated.

[0226] Furthermore, in the second embodiment, the first light reflecting member 40A disposed on the first B side surface 15B of the first light guide portion 10A is also disposed so as to extend toward the first B main surface 11B. Similarly, the second light reflecting member 40B disposed on the second B side surface 16B of the second light guide portion 10B is also disposed so as to extend toward the second B main surface 12B. By disposing the first light reflecting member 40A and the second light reflecting fitting 40B on the third light reflecting member 42, it is possible to suppress the light propagating in the first light guide portion 10A and the second light guide portion 10B from reaching the support member 200 and being absorbed.

[0227] Figures 22A to 22B It is a schematic cross-sectional view showing a method of manufacturing a planar light source according to the second embodiment of the present invention.

[0228] After forming the first groove portion 14a in the light guide plate 110, as Figure 22A shown, the light reflecting member 40 is continuously formed with the bottom surface, side surface, and second main surface 110B of the first groove portion 14a by a method such as spraying.

[0229] After that, as Figure 22B shown, the first hole portion 13A is formed in the light guide plate 110. The light reflecting member 40 formed at the position where the first hole portion 13A is formed in the second main surface 110B is removed.

[0230] After that, the light reflecting member 40 disposed on the second main surface 110B is bonded to the second bonding member 43 of the support member 200, and the light guide plate 110 is disposed on the support member 200. After that, the Figure 13 subsequent processes are continued.

[0231] According to the second embodiment, compared with the process of selectively forming the light reflecting member 40 only in the first groove portion 14a, the process can be simplified.

[0232] [Third Embodiment]

[0233] Figure 23 It is a schematic cross-sectional view of a planar light source according to the third embodiment of the present invention.

[0234] Figure 24A And Figure 24B is a schematic top view of the first B main surface 11B side of the first light guide portion 10A in the planar light source viewed through the support member 200. Figure 23

[0235] In the third embodiment, the structures of the first side surface 15 of the first light guide portion 10A and the second side surface 16 of the second light guide portion 10B are also the same as those in the first embodiment, and it is possible to reduce the brightness reduction that may occur between the adjacent light guide portions 10A and 10B divided by the dividing groove 14.

[0236] The difference between the third embodiment and the second embodiment is that on the first light reflection member 40A disposed on the first main surface 11B, a first opening 81 where the first light reflection member 40A is not disposed is formed around the first light source 20A on the first main surface 11B. Similarly, in the second light guide portion 10B, on the second light reflection member 40B disposed on the second main surface 12B, a second opening 81 where the second light reflection member 40B is not disposed is formed around the second light source 20B on the second main surface 12B.

[0237] In Figure 24A and 24B, the first light reflection member 40A is represented by dot shading. As Figure 24A shown, the top view shape of the first opening 81 is, for example, circular. Or, as Figure 24B shown, the top view shape of the first opening 81 is, for example, quadrilateral. It should be noted that the top view shape of the first opening 81 may also be, for example, elliptical or a shape other than quadrilateral. When observing the first main surface 11B of the first light guide portion 10A from above, the first light source 20A and the first hole portion 13A are located within the first opening 81.

[0238] According to the third embodiment, in the peripheral region of the first light source 20A, the light directed toward the first main surface 11B side can pass through the first opening 81 and reach the third light reflection member 42. Moreover, for example, the diffuse reflectance of the light emitted from the first light source 20A in the first light reflection member 40A is higher than the diffuse reflectance of the light emitted from the first light source 20A in the third light reflection member 42. The specular reflectance of the light emitted from the first light source 20A in the third light reflection member 42 is higher than the specular reflectance of the light emitted from the first light source 20A in the first light reflection member 40A. In this case, the light reaching the third light reflection member 42 is totally reflected by the third light reflection member 42 and is guided within the first light guide portion 10A.

[0239] The peripheral region of the first light source 20A has a higher brightness compared to other regions. On the contrary, the brightness of the first side surface 15 far from the first light source 20A or the region near the corner is likely to be lower. According to the third embodiment, by not disposing the first light reflection member 40A with a high diffuse reflectance in the peripheral region of the first light source 20A, it is possible to suppress the light from the first light source 20A from being taken out to the outside from the first main surface 11A before reaching the first side surface 15 or the corner. In addition, by disposing the third light reflection member 42 with a high specular reflectance in the peripheral region of the first light source 20A, it is possible to easily guide the light from the first light source 20A toward the first side surface 15 or the corner within the first light guide portion 10A. As a result, the brightness unevenness within the light emitting surface can be improved.

[0240] Figures 25A to 25CIt is a schematic cross-sectional view showing a method for manufacturing a planar light source according to a third embodiment of the present invention.

[0241] After forming the first groove portion 14a and the first hole portion 13A in the light guide plate 110, as Figure 25A shown, the jig 90 is inserted into the first hole portion 13A. A part 90a of the jig 90 is located outside the first hole portion 13A and covers the second main surface 110B surrounding the first hole portion 13A.

[0242] In this state, as Figure 25B shown, a light reflecting member 40 is formed on the second main surface 110B that is not covered by the bottom surface, side surfaces of the first groove portion 14a, and the jig 90. The light reflecting member 40 is also formed on the upper surface of the jig 90.

[0243] Moreover, by removing the jig 90 from the first hole portion 13A, as Figure 25C shown, a light reflecting member 40 is obtained in which a first opening portion 81 where the light reflecting member 40 is not disposed is formed in the peripheral region of the first hole portion 13A in the second main surface 110B.

[0244] After that, the light reflecting member 40 disposed on the second main surface 110B is bonded to the second bonding member 43 of the support member 200, and the light guide plate 110 is disposed on the support member 200. Then, the Figure 13 subsequent processes are continued.

[0245] Figures 26A to 26K It is a schematic cross-sectional view showing an example of the cross-sectional shape of the dividing groove 14 in the planar light source of each embodiment.

[0246] In Figures 26A to 26F the example shown, the first B side surface 15B and the second B side surface 16B are perpendicular to the main surfaces 11A, 11B, 12A, 12B of the light guide portions 10A, 10B. In Figures 26A to 26D the example shown, the first C side surface 15C and the second C side surface 16C are parallel to the main surfaces 11A, 11B, 12A, 12B.

[0247] In Figure 26A the example shown, the first A side surface 15A and the second A side surface 16A are inclined with respect to the main surfaces 11A, 11B, 12A, 12B. The first A main surface 11A and the first A side surface 15A form an obtuse angle and are continuous. The second A main surface 12A and the second A side surface 16A form an obtuse angle and are continuous. The width of the second groove portion 14b gradually becomes narrower as it goes from the A main surfaces 11A, 12A toward the B main surfaces 11B, 12B, and the light emitted from the first A side surface 15A and the second A side surface 16A is refracted upward and taken out to the outside, so that the brightness reduction near the dividing groove 14 can be reduced.

[0248] As shown in Figure 26B FIG. 2, the first A-side surface 15A and the second A-side surface 16A may also be perpendicular to the main surfaces 11A, 11B, 12A, and 12B. Thereby, light can easily propagate between the first A-side surface 15A and the second A-side surface 16A.

[0249] In Figure 26C the example shown in FIG. 3, the first A-main surface 11A and the first A-side surface 15A are continuously formed at an acute angle. The second A-main surface 12A and the second A-side surface 16A are continuously formed at an acute angle. The width of the second groove portion 14b gradually widens from the A-main surfaces 11A, 12A toward the B-main surfaces 11B, 12B, and light incident from the first A-side surface 15A and the second A-side surface 16A can easily propagate in directions parallel to the A-main surfaces 11A, 12A, respectively.

[0250] In Figure 26D the example shown in FIG. 4, the corner between the first A-main surface 11A and the first A-side surface 15A has a curved surface. The corner between the second A-main surface 12A and the second A-side surface 16A also has a curved surface. Thereby, light can easily be extracted to the outside from the corner, and a reduction in brightness near the dividing groove 14 can be alleviated.

[0251] In Figure 26E the example shown in FIG. 5, the first C-side surface 15C and the second C-side surface 16C are inclined with respect to the main surfaces 11A, 11B, 12A, and 12B. Thereby, a part of the light that propagates in the light guide portion 10A and is directed toward the first A-side surface 15A and a part of the light that propagates in the light guide portion 10B and is directed toward the second A-side surface 16A can be reflected in directions approaching the second groove portion 14b, respectively. Therefore, a reduction in brightness near the dividing groove 14 can be alleviated. The first B-side surface 15B and the first C-side surface 15C are continuously formed at an acute angle. The second B-side surface 16B and the second C-side surface 16C are continuously formed at an acute angle. Further, the surface opposed to the first C-side surface 15C on the first A-main surface 11A side is also inclined in the same manner as the first C-side surface 15C. The surface opposed to the second C-side surface 16C on the second A-main surface 12A side is also inclined in the same manner as the second C-side surface 16C. By inclining the surface opposed to the first C-side surface 15C and the surface opposed to the second C-side surface 16C, respectively, the light emitted from the surface opposed to the first C-side surface 15C and the surface opposed to the second C-side surface 16C is refracted upward and extracted to the outside, respectively. Therefore, a reduction in brightness near the dividing groove 14 can be alleviated.

[0252] In Figure 26FIn the example shown, the first C side surface 15C and the surface facing the first C side surface 15C are inclined with respect to the main surfaces 11A and 11B, respectively. In addition, the second C side surface 16C and the surface facing the second C side surface 16C are also inclined with respect to the main surfaces 12A and 12B, respectively. Furthermore, in this example, at least the first C side surface 15C, the surface facing the first C side surface 15C, the second C side surface 16C, and the surface facing the second C side surface 16C each have a curved surface. In particular, the surface facing the first C side surface 15C and the surface facing the second C side surface 16C have curved surfaces. As a result, a part of the light propagating toward the dividing groove 14 in the light guide portions 10A and 10B is refracted in a manner of being expanded by the curved surfaces and is easily extracted to the outside. Therefore, a reduction in brightness near the dividing groove 14 can be alleviated.

[0253] In addition, at least a part of the first A side surface 15A and the second A side surface 16A are in contact with each other, enabling light to easily propagate between the first A side surface 15A and the second A side surface 16A. In addition to the first A side surface 15A and the second A side surface 16A being in contact with each other as in this example, the first A side surface 15A may be in contact with the surface facing the second C side surface 16C, or the second A side surface 16A may be in contact with the surface facing the first C side surface 15C.

[0254] In addition, in the thickness direction of the first light guide portion 10A, the distance between the first C side surface 15C and the surface facing the first C side surface 15C becomes shorter as it approaches the first A side surface 15A. In other words, the thickness of the first convex portion 17 in the thickness direction of the first light guide portion 10A becomes thinner as it approaches the dividing groove 14. The distance between the second C side surface 16C and the surface facing the second C side surface 16C also becomes shorter as it approaches the second A side surface 16A. In other words, the thickness of the second convex portion 18 in the thickness direction of the second light guide portion 10B becomes thinner as it approaches the dividing groove 14. In this way, as it approaches the dividing groove 14, the thicknesses of the first convex portion 17 and the second convex portion 18 become thinner. As a result, a part of the light propagating in the light guide portion 10A and heading toward the first A side surface 15A and a part of the light propagating in the light guide portion 10B and heading toward the second A side surface 16A are easily extracted to the outside from the surface facing the first C side surface 15C and the surface facing the second C side surface 16C, respectively. Therefore, a reduction in brightness near the groove dividing portion 14 can be alleviated.

[0255] In Figure 26GIn the example shown, the first side surface 15B and the second side surface 16B are inclined with respect to the main surfaces 11A, 11B, 12A, and 12B. The width of the first groove portion 14a formed by the first side surface 15B and the second side surface 16B gradually widens as it approaches the B main surfaces 11B and 12B from the second groove portion 14b, and a part of the light propagating in the light guide portions 10A and 10B toward the dividing groove 14 can be reflected toward the A main surfaces 11A and 12A and taken out to the outside. Therefore, a decrease in brightness near the dividing groove 14 can be alleviated. The first side surface 15A and the second side surface 16A are perpendicular to the main surfaces 11A, 11B, 12A, and 12B, and light can easily propagate between the first side surface 15A and the second side surface 16A. It should be noted that in the present embodiment, no step is formed between the first side surface 15A and the first side surface 15B, and between the second side surface 16A and the second side surface 16B.

[0256] Figure 26H The structure shown corresponds to a structure in which Figure 26G a first C side surface 15C is disposed between the first A side surface 15A and the first B side surface 15B shown, and a second C side surface 16C is disposed between the second A side surface 16A and the second B side surface 16B. By having the first C side surface 15C and the second C side surface 16C, a part of the light propagating between the first A side surface 15A and the second A side surface 16A can be easily reflected toward the A main surfaces 11A and 12A, and a decrease in brightness near the dividing groove 14 can be further alleviated.

[0257] In Figure 26I the example shown, the cross-sectional shape of the first groove portion 14a is an inverted U shape, and the first C side surface 15C and the second C side surface 16C are curved surfaces. Thus, the light propagating in the light guide portions 10A and 10B toward the dividing groove 14 is respectively reflected by the curved surfaces and scattered, so that the light totally reflected by the A main surfaces 11A and 12A can be reduced and the light taken out to the outside can be increased, and a decrease in brightness near the dividing groove 14 can be alleviated.

[0258] It is also possible to have a plurality of steps between the first A side surface 15A and the first B side surface 15B, and a plurality of steps between the second A side surface 16A and the second B side surface 16B. In Figure 26J the example shown, there are two-level steps between the first A side surface 15A and the first B side surface 15B, and two-level steps between the second A side surface 16A and the second B side surface 16B. In this way, by having a plurality of steps, the light propagating in the light guide portions 10A and 10B can be easily scattered toward the dividing groove 14. Therefore, the light totally reflected by the A main surfaces 11A and 12A can be reduced and the light taken out to the outside can be increased, and a decrease in brightness near the dividing groove 14 can be alleviated.

[0259] In the embodiment described above, an example is shown in which the first A side surface 15A is continuous with the first A main surface 11A, the first B side surface 15B is continuous with the first B main surface 11B, the second A side surface 16A is continuous with the second A main surface 12A, and the second B side surface 16B is continuous with the second B main surface 12B.

[0260] Conversely, as Figure 26K shown, it is also possible that the first A side surface 15A is continuous with the first B main surface 11B, the first B side surface 15B is continuous with the first A main surface 11A, the second A side surface 16A is continuous with the second B main surface 12B, and the second B side surface 16B is continuous with the second A main surface 12A. That is, the second groove portion 14b formed on the first A side surface 15A and the second A side surface 16A is located between the support member 200 and the first groove portion 14a. The first groove portion 14a opens on the side of the first A main surface 11A and the second A main surface 12A.

[0261] In this case, after the light guide plate 110 is disposed on the support member 200, a cutting tool is placed in the first groove portion 14a, and the portion of the light guide plate 110 connected below the first groove portion 14a is cut to form the second groove portion 14b.

[0262] The first groove portion 14a may also be filled with the light reflecting members 40A and 40B. In this case, warping may occur due to the connection of the first B side surface 15B of the first light guide portion 10A and the second B side surface 16B of the second light guide portion 10B via the light reflecting members 40A and 40B filled in the first groove portion 14a. Therefore, it is preferable that there is a space (air layer) between the first B side surface 15B and the second B side surface 16B.

[0263] Figure 26K The dividing groove 14 corresponds to a structure in which the upper and lower portions of the dividing groove 14 are reversed. The dividing groove 14 with the upper and lower portions of other Figure 26B structures reversed can also be applied to the planar light source of the present embodiment. Similarly, in such a structure, the amount of light propagated between the adjacent light guide portions 10A and 10B divided by the dividing groove 14 can be adjusted by the cross-sectional shape of the dividing groove 14, the distribution ratio of the portions where the light reflecting member 40 is disposed and the portions where the light reflecting member 40 is not disposed in the first side surface 15 and the second side surface 16, etc. Figure 26A 、 Figures 26C to 26J The dividing groove 14 corresponding to the structure in which the upper and lower portions of the dividing groove 14 are reversed can also be applied to the planar light source of the present embodiment. Similarly, in such a structure, the amount of light propagated between the adjacent light guide portions 10A and 10B divided by the dividing groove 14 can be adjusted by the cross-sectional shape of the dividing groove 14, the distribution ratio of the portions where the light reflecting member 40 is disposed and the portions where the light reflecting member 40 is not disposed in the first side surface 15 and the second side surface 16, etc.

[0264] [Fourth Embodiment]

[0265] Figure 27 FIG. is a schematic cross-sectional view of a portion where the first light source 20A is disposed and its peripheral portion in the planar light source according to the fourth embodiment of the present invention.

[0266] It should be noted that Figure 27The first light guide part 10A, the first main surface 11A, the first B main surface 11B, and the first light source 20A shown can be replaced with the second light guide part 10B, the second A main surface 12A, the second B main surface 12B, and the second light source 20B, respectively.

[0267] The first light source 20A includes a light-emitting element 21, a first light-transmissive member 22, a covering member 24, an adhesive member 26, and an electrode 23. The covering member 24 is disposed on the side surface and the lower surface of the light-emitting element 21. The first light-transmissive member 22 is disposed on the light-emitting element 21 and on the covering member 24. The light-emitting element 21 is bonded to the first light-transmissive member 22 by a light-transmissive adhesive member 26. The covering member 24 covers the adhesive member 26, the side surface, and the lower surface of the light-emitting element 21. The lower surface of the electrode 23 is exposed from the covering member 24.

[0268] The first light guide part 10A has a first concave portion 113 that opens on the side of the first B main surface 11B as a first hole portion. In the present embodiment, the first concave portion 113 is a frustum-shaped space. For example, it may be a frustum-shaped space such as a quadrangular frustum or a hexagonal frustum. The first light source 20A is disposed in the first concave portion 113. A third light-transmissive member 45 is disposed between the side surface of the first concave portion 113 and the side surface of the first light source 20A. The third light-transmissive member 45 is, for example, a resin member that is transmissive to the light emitted by the first light source 20A.

[0269] A second concave portion 114 is formed at a position of the first A main surface 11A side of the first light guide part 10A that faces the first concave portion 113. Examples of the second concave portion 114 include concave portions such as a conical shape, a quadrangular pyramid shape, and a hexagonal pyramid shape, and frustum-shaped concave portions such as a frustum of a cone, a frustum of a quadrangular pyramid, and a frustum of a hexagonal pyramid. In addition, a light adjustment member 46 is disposed in the second concave portion 114. The light adjustment member 46 is configured in the same manner as the above-described light adjustment member 74.

[0270] A light reflection member 44 is disposed on the first B main surface 11B of the first light guide part 10A. The light reflection member 44 is, for example, a resin member containing a light diffusing agent. In addition, the light reflection member 44 is also disposed on the lower surface of the third light-transmissive member 45.

[0271] In addition to the structure described above, the light-emitting module 100 further includes a wiring layer 56. The wiring layer 56 is disposed on the lower surface of the light reflection member 44 and on the lower surface of the covering member 24. A pair of wiring layers 56 are disposed corresponding to the positive and negative pair of electrodes 23 of the first light source 20A, and each wiring layer 56 is connected to each electrode 23. A wiring substrate 55 is bonded to the wiring layer 56.

[0272] Among the plurality of light guide portions of the light emitting module 100, there is a light guide portion having an outer peripheral portion that is not adjacent to other light guide portions via a dividing groove 14. On its outer peripheral portion, a light reflecting member may also be disposed on the first side surface 15A and the second side surface 16A. For example, in Figure 2 a light reflecting member may be disposed on the first side surface 15A of the outer peripheral portion at the left end of the first light guide portion 10A, and a light reflecting member may also be disposed on the second side surface 16A of the outer peripheral portion at the right end of the second light guide portion 10B.

[0273] Figure 28A FIG. 6 is a schematic cross-sectional view showing an example of the outer peripheral portion 11C of the first light guide portion 10A. In this outer peripheral portion 11C, the aforementioned first light reflecting member 40A is disposed on the first side surface 15B and the first side surface 15C. Further, a light reflecting member 47 (hereinafter referred to as the fourth light reflecting member 47) is disposed on the first side surface 15A. That is, the fourth light reflecting member 47 is disposed on the support member 200 so as to cover the first side surface 15A and the first light reflecting member 40A. The support member 200 extends to the outside of the first side surface 15B so as to overlap the first side surface 15A and the first side surface 15C in a plan view. The fourth light reflecting member 47 is disposed on the uppermost second adhesive member 43 in the extended portion of the support member 200. It should be noted that the material of the fourth light reflecting member 47 may be the same as the material of the first light reflecting member 40A.

[0274] For example, in the first side surface 15 ( Figure 2 the right side first side surface 15 in FIG. 11) of the first light guide portion 10A adjacent to the second light guide portion 10B, light is obtained that travels from the first light source 20A disposed in the first light guide portion 10A toward the first side surface 15, is diffusely reflected by the first light reflecting member 40A disposed in the first side surface 15, and returns to the inside of the first light guide portion 10A. Further, light is obtained that travels from the first light source 20A toward the first side surface 15, passes through the first light reflecting member 40A, and is diffusely reflected by the second light reflecting member 40B disposed in the second side surface 16 of the adjacent second light guide portion 10B and returns to the inside of the first light guide portion 10A. That is, in the region on the side surface side adjacent to other light guide portions, return light from the two light reflecting members 40A and 40B is obtained.

[0275] As Figure 28A shown, even in the outer peripheral portion 11C where there is no adjacent other light guide portion, light can be returned to the inside of the first light guide portion 10A from the two light reflecting members, the first light reflecting member 40A and the fourth light reflecting member 47. Therefore, it is possible to reduce the brightness deviation in the region on the first side surface 15 side of the first light guide portion 10A adjacent to the second light guide portion 10B and the region on the outer peripheral portion 11C side that is not adjacent to other light guide portions.

[0276] AsFigure 28B As shown, in the outer peripheral portion 11C, the ends of the first adhesive member 41, the third light reflecting member 42, and the second adhesive member 43 may be located on the side closer to the first light source 20A than the first B side surface 15B of the first light guiding portion 10A. Thus, a part of the fourth light reflecting member 47 is disposed between the first B main surface 11B of the first light guiding portion 10A exposed from the first adhesive member 41, the third light reflecting member 42, and the second adhesive member 43 and the wiring substrate 50.

[0277] Since the ends of the first adhesive member 41 and the second adhesive member 43 are covered by the fourth light reflecting member 47 and do not protrude to the outside of the planar light source, it is possible to prevent dust or dirt from adhering to the ends of the first adhesive member 41 or the second adhesive member 43. In addition, it is also possible to prevent light leakage from the ends of the first adhesive member 41, the third light reflecting member 42, and the second adhesive member 43.

[0278] Figure 29 It is a schematic cross-sectional view showing an example of the outer peripheral portion 12C of the second light guiding portion 10B, for example.

[0279] As Figure 1 shown, the planar light source 300 is a quadrilateral having four sides in a top view, and the wiring substrate 50 is also a quadrilateral having four sides in a top view. A terminal portion 400 for connecting an external circuit and the wiring layer of the wiring substrate 50 is disposed near, for example, one side of the wiring substrate 50. The outer peripheral portion 12C of the second light guiding portion 10B is located on the side of the wiring substrate 50 where the terminal portion 400 is disposed.

[0280] In this outer peripheral portion 12C, the aforementioned second light reflecting member 40B is disposed on the second B side surface 16B and the second C side surface 16C. Further, a light reflecting member 48 (hereinafter referred to as the fifth light reflecting member 48) is disposed on the second A side surface 16A. The fifth light reflecting member 48 is disposed on the wiring substrate 50 and covers the second A side surface 16A and the second light reflecting portion 40B. The material of the fifth light reflecting member 48 may be the same as that of the second light reflecting member 40B.

[0281] In Figure 28A and Figure 28B in the outer peripheral portion 11C shown, the end surfaces of the fourth light reflecting member 47 and the support member 200 may be arranged to be aligned with each other, that is, located in the same plane. Such an arrangement can be obtained, for example, by cutting the fourth light reflecting member 47 and the support member 200 together. In contrast, as Figure 29As shown, outside the outer peripheral portion 12C, the wiring substrate 50 and the insulating film 52 extend further outward than the second side surface 16, and the terminal portion 400 is disposed on the extended wiring substrate 50. Therefore, the wiring substrate 50 cannot be cut outside the second side surface 16, and the fifth light reflecting member 48 disposed on the second side surface 16 is not cut either. Instead, it is supplied onto the wiring substrate 50 in a state of, for example, a resin having fluidity and directly cured. Therefore, the side surface of the fifth light reflecting member 48 has a convex curved surface.

[0282] In addition, in this outer peripheral portion 12C, similar to the example shown in Figure 28B , the ends of the first adhesive member 41, the third light reflecting member 42, and the second adhesive member 43 are located on the side closer to the second light source 20B than the second B side surface 16B of the second light guiding portion 10B. Moreover, a part of the fifth light reflecting member 48 is disposed between the second B main surface 12B of the second light guiding portion 10B exposed from the first adhesive member 41, the third light reflecting member 42, and the second adhesive member 43 and the wiring substrate 50.

[0283] Figure 30 It is a schematic cross-sectional view showing an example of the outer peripheral portion in the display device 500A including the planar light source according to the embodiment of the present invention. Figure 30 It represents the vicinity of the outer peripheral portion of the first light guiding portion 10A. The vicinity of the outer peripheral portion of the second light guiding portion 10B is also configured in the same manner as the vicinity of the outer peripheral portion of the first light guiding portion 10A.

[0284] The display device 500A includes any one of the planar light sources of the above-described embodiments, an optical sheet 503, a liquid crystal panel 504, and a frame 502. The planar light source functions as a backlight of the display device 500A.

[0285] The support member 200 extends further outward than the outer peripheral portion (the outer peripheral portion of the second light guiding portion 10B) of the first light guiding portion 10A, and the frame 502 is disposed on the uppermost second adhesive member 43 in the extended portion of the support member 200. The lower surface of the frame 502 is adhered to the second adhesive member 43. The frame 502 is disposed further outside than the outer peripheral portion (the outer peripheral portion of the second light guiding portion 10B) of the first light guiding portion 10A. That is, the first light guiding portion 10A (the second light guiding portion 10B) is located inside the region surrounded by the frame 502. The frame 502 is made of a white resin member having reflectivity to the light emitted from the planar light source or a black resin member having light shielding property (absorbing property) to the light emitted from the planar light source.

[0286] The optical sheet 503 is disposed above the first light guide portion 10A (the second light guide portion 10B) in the region surrounded by the frame 502, i.e., the inner side. The optical sheet 503 faces the A main surfaces 11A and 12A of the light guide portions 10A and 10B. The optical sheet 503 includes, for example, a plurality of light diffusion sheets and a plurality of prism sheets.

[0287] The liquid crystal panel 504 is disposed on the optical sheet 503. The optical sheet 503 is disposed between the planar light source and the liquid crystal panel 504. The lower surface of the outer peripheral side of the liquid crystal panel 504 is disposed in contact with the frame 502.

[0288] Figure 31 FIG. is a schematic cross-sectional view showing a display device 500B including a planar light source according to an embodiment of the present invention.

[0289] The display device 500B includes any one of the planar light sources of the above-described embodiments, a housing 501, a frame 502, an optical sheet 503, and a liquid crystal panel 504. The planar light source functions as a backlight for the display device 500B.

[0290] The planar light source is disposed on the bottom surface of the housing 501 via an adhesive member 505. The support member 200 of the planar light source is bonded to the upper surface of the adhesive member 505, and the lower surface of the adhesive member 505 is bonded to the bottom surface of the housing 501. The housing 501 is made of, for example, a metal such as aluminum or stainless steel. Alternatively, the housing 501 is made of resin.

[0291] The frame 502 is disposed on the bottom surface of the housing 501 via an adhesive member 506. The frame 502 is disposed more outward than the outer peripheral portion 11C of the first light guide portion 10A and the outer peripheral portion 12C of the second light guide portion 10B. That is, the first light guide portion 10A and the second light guide portion 10B are located inside the region surrounded by the frame 502. The frame 502 is disposed between the side surface of the housing 501 and the outer peripheral portions 11C and 12C of the light guide portions 10A and 10B.

[0292] The optical sheet 503 is disposed above the light guide portions 10A and 10B in the inner side surrounded by the frame 502. The optical sheet 503 faces the A main surfaces 11A and 12A of the light guide portions 10A and 10B. The optical sheet 503 includes, for example, a plurality of light diffusion sheets and a plurality of prism sheets.

[0293] The liquid crystal panel 504 is disposed on the optical sheet 503. The optical sheet 503 is disposed between the planar light source and the liquid crystal panel 504. The lower surface of the outer peripheral side of the liquid crystal panel 504 is disposed in contact with the frame 502.

[0294] Figure 31 The outer peripheral portion 11C of the first light guide portion 10A in the shown planar light source is, for example, Figure 28AThe structure shown. Alternatively, the outer peripheral portion 11C of the first light guide portion 10A may also be set to Figure 28B The structure shown.

[0295] The outer peripheral portion 12C of the second light guide portion 10B is, for example, Figure 29 The structure shown. Therefore, the wiring substrate 50 extends to the outside of the outer peripheral portion 12C. The wiring substrate 50 penetrates through the opening formed in the frame 502 and the opening formed in the housing 501 on the outside of the outer peripheral portion 12C and extends to the outside of the housing 501. A terminal portion 400 is disposed in the portion of the wiring substrate 50 that extends to the outside of the housing 501.

[0296] [Embodiment 5]

[0297] Figure 32 It is a schematic plan view of a portion where the first light source 20A is disposed and its peripheral portion in the planar light source according to the fifth embodiment of the present invention.

[0298] Figure 33 It is a schematic cross-sectional view of a portion where the first light source 20A is disposed and its peripheral portion in the planar light source according to the fifth embodiment, and is a schematic cross-sectional view along the Figure 32 XXXIII-XXXIII line of. Figure 34A It is a schematic cross-sectional view showing the cross-sectional shape of the dividing groove 14 in the planar light source according to the fifth embodiment.

[0299] As Figure 33 In the first hole portion 13A, the wavelength conversion member and the third light transmissive member are not disposed, and the second light transmissive member 71 is disposed in a single layer. The second light adjustment member 74 is disposed in contact with the second light transmissive member 71. The second light transmissive member 71 may contain the above-mentioned phosphor or light diffusing agent, etc. By containing a phosphor in the second light transmissive member 71, it can function like a wavelength conversion member. By making the second light transmissive member 71 contain a light diffusing agent, for example, a part of the light traveling in the X direction and / or Y direction from the first light source 20A can be changed to light traveling in the Z direction. Thereby, it is easy to improve the luminance unevenness in the light emitting surface.

[0300] As Figure 34AAs shown, the first side surface 15A is continuous with the first main surface 11B, the first side surface 15B is continuous with the first main surface 11A, the second side surface 16A is continuous with the second main surface 12B, and the second side surface 16B is continuous with the second main surface 12A. The second groove portion 14b defined by the first side surface 15A and the second side surface 16A is located between the support member 200 and the first groove portion 14a. The first groove portion 14a opens on the side of the first main surface 11A and the second main surface 12A. The first side surface 15B and the second side surface 16B of the fifth embodiment are inclined with respect to the main surfaces 11A, 11B, 12A, and 12B. For example, the width of the first groove portion 14a gradually widens as it goes from the B main surfaces 11B and 12B toward the A main surfaces 11A and 12A. By appropriately selecting the cross-sectional shape of the dividing groove 14, the amount of light propagating between the light guide portions 10A and 10B can be adjusted.

[0301] As Figure 34B shown, the first side surface 15 has a first side surface 15A, a first side surface 15B, a first side surface 15C, and a first side surface 15D. Similarly, the second side surface 16 has a second side surface 16A, a second side surface 16B, a second side surface 16C, and a second side surface 16D. The first side surface 15A is continuous with the first main surface 11B, and the first side surface 15B is continuous with the first main surface 11A. The first side surface 15C and the first side surface 15D are located between the first side surface 15A and the first side surface 15B. The first side surface 15C is continuous with the first side surface 15A, and the first side surface 15D is continuous with the first side surface 15B. The second side surface 16A is continuous with the second main surface 12B, and the second side surface 16B is continuous with the second main surface 12A. The second side surface 16C and the second side surface 16D are located between the second side surface 16A and the second side surface 16B. The second side surface 16C is continuous with the second side surface 16A, and the second side surface 16D is continuous with the second side surface 16B. The first side surface 15B and the second side surface 16B are perpendicular to the main surfaces 11A, 11B, 12A, and 12B of the light guide portions 10A and 10B. Thus, in the thickness direction of the first light guide portion 10A, the change in the width of the first groove portion 14a defined by the first side surface 15B and the second side surface 16B is suppressed. Thereby, the width deviation of the first groove portion 14a can be suppressed, and thus it is easy to suppress the uneven brightness of each light emitting region. The first side surface 15D and the second side surface 16D are inclined with respect to the main surfaces 11A, 11B, 12A, and 12B. For example, the width of the second side surface 16D starting from the first side surface 15D gradually widens as it goes from the B main surfaces 11B and 12B toward the A main surfaces 11A and 12A. By appropriately selecting the cross-sectional shape of the dividing groove 14, the amount of light propagating between the light guide portions 10A and 10B can be adjusted.

[0302] Figures 35A to 35EIt is a schematic cross-sectional view showing an example of a method for manufacturing a planar light source according to the fifth embodiment.

[0303] As Figure 5 shown, after forming the first hole portion 13A and the second hole portion 13B in the light guide plate 110, as Figure 35A shown, a first member 91 covering the first main surface 110A of the light guide plate 110 is formed. The first member 91 covers the opening portion on the first main surface 110A side of the first hole portion 13A and the opening portion on the first main surface 110A side of the second hole portion 13B. In this state, as Figure 35B shown, a first groove portion 14a is formed in the light guide plate 110. When forming the first groove portion 14a in the light guide plate 110, a part of the first member 91 is removed. Thus, as Figure 35B shown, it is easy to cover the portion of the first main surface 110A located in the peripheral region of the first groove portion 14a with the first member 91. Next, as Figure 35C shown, a light reflection member 40 covering the bottom surface and the side surface of the first groove portion 14a is formed. The light reflection member 40 is formed so as to cover at least a part of the first member 91. Moreover, by removing the first member 91 from the light guide plate 110, as Figure 35D shown, it is possible to prevent the portion of the first main surface 110A located in the peripheral region of the first groove portion 14a from being covered by the light reflection member 40. Thus, the light from the first light source 20A is easily taken out to the outside from the first main surface 11 located in the peripheral region of the first groove portion 14a.

[0304] The material of the first member 91 is not particularly limited. As the material of the first member 91, it is preferably a release sheet having an adhesive layer on at least one surface and a function of reducing its adhesiveness due to temperature change or light irradiation, etc. For example, it is preferable that the adhesive layer contains a foaming agent that foams by heat. By heating the adhesive layer, the first member 91 can be easily peeled off from the light guide plate 110. As such a release sheet, commercially available products can also be used. As the release sheet, for example, a temperature-sensitive adhesive sheet manufactured by Nitta Corporation can be cited.

[0305] After forming the light reflection member 40 covering the bottom surface and the side surface of the first groove portion 14a, the light guide plate is disposed on the support member. After disposing the light guide plate 110 on the support member 200, as Figure 35E shown, the portion connected below the first groove portion 14a in the light guide plate 110 is removed to form a second groove portion 14b. As a method for removing the portion connected below the first groove portion 14a in the light guide plate 110, for example, known methods such as cutting and laser processing can be used. In the case of using cutting, an ultrasonic tool or a rotary tool can also be used. After that, continue Figure 14Subsequent processes. It should be noted that the order of the process of removing the portion connected below the first groove portion 14a to form the second groove portion 14b is not particularly limited. For example, the process of forming the second groove portion 14b can be performed after the light source is disposed in the hole portion, or after the second light-transmissive member is formed in the hole portion.

[0306] [Sixth Embodiment]

[0307] Figure 36 FIG. 7 is a schematic plan view showing an example of a display device 500C including a planar light source according to an embodiment of the present invention. Figure 37 is along Figure 36 schematic cross-sectional view taken along line XXXVII-XXXVII. Figure 38 is from Figure 36 schematic plan view of the display device 500C in which the optical sheet 503 and the liquid crystal panel 504 are omitted.

[0308] The display device 500C includes any one of the planar light sources of the above-described embodiments, an optical sheet 503, a liquid crystal panel 504, and a holding member 505. The planar light source functions as a backlight of the display device 500C.

[0309] As Figure 37 shown, the support member 200 has an extension portion that extends more outward than the outer peripheral portion of the first light guide portion 10A (the outer peripheral portion of the second light guide portion 10B). The display device 500C is provided with a holding member 505 on the extension portion of the support member 200. The holding member 505 can be fixed to the support member 200 by an adhesive material or the like. The holding member 505 is disposed more outward than the outer peripheral portion of the first light guide portion 10A (the outer peripheral portion of the second light guide portion 10B). As Figure 36 shown, the holding member 505 may be plural or may be one.

[0310] As Figure 38 shown, it is preferable that a part of the holding member 505 extending in the Y direction and a part of the dividing groove 14 extending in the X direction overlap in the X direction. Thereby, it is possible to suppress the planar light source from bending along the X direction. It is preferable that a part of the dividing groove 14 extending in the X direction is clamped by a part of the holding member 505 extending in the Y direction in the X direction. Thereby, it is possible to suppress the planar light source from bending along the X direction. It is preferable that a part of the holding member 505 extending in the X direction and a part of the dividing groove 14 extending in the Y direction overlap in the Y direction. Thereby, it is possible to suppress the planar light source from bending along the Y direction. It is preferable that a part of the dividing groove 14 extending in the Y direction is clamped by a part of the holding member 505 extending in the X direction in the Y direction. Thereby, it is possible to suppress the planar light source from bending along the Y direction. As Figure 38As shown, it is preferable that the holding member 505 surrounds the light guide portions 10A and 10B in a top view. Thereby, deformation of the planar light source can be suppressed.

[0311] The holding member 505 is made of a material that is less likely to be deformed by an external force than the wiring substrate 50 of the planar light source. As the material of the holding member 505, for example, thermoplastic resins such as acrylic, polycarbonate, cyclic olefin, polyethylene terephthalate, or polyester, thermosetting resins such as epoxy or silicone, or glass can be used. The material of the holding member 505 and the materials of the light guide portions 10A and 10B can be the same.

[0312] [Embodiment 7]

[0313] Figure 39 FIG. 10 is a schematic top view showing a planar light source 300A according to an embodiment of the present invention. Figure 40 FIG. 11 is a schematic top view showing the planar light source 300A and the holding member 505. Figure 41 FIG. 14 is a schematic cross-sectional view showing a display device 500D including the planar light source 300A. Figure 42 FIG. 16 is a schematic cross-sectional view showing a modified example of the display device 500D.

[0314] The display device 500D includes a planar light source 300A, an optical sheet 503, a liquid crystal panel 504, and a holding member 505. The planar light source 300A functions as a backlight of the display device 500D.

[0315] As Figure 39 shown, the planar light source 300A may also include a plurality of outer peripheral light guide portions 10D located more outside than the outer peripheral portion of the first light guide portion 10A (the outer peripheral portion of the second light guide portion 10B). The outer peripheral light guide portions 10D can be formed, for example, by a part of the light guide plate 110 when the light guide plate 110 is separated by the dividing groove 14. As Figure 39 shown, the plurality of outer peripheral light guide portions 10D are separated by the dividing groove 14, respectively.

[0316] When the planar light source 300A includes a plurality of outer peripheral light guide portions 10D extending more outside than the outer peripheral portion of the first light guide portion 10A (the outer peripheral portion of the second light guide portion 10B), as Figure 40 and Figure 41 shown, the holding member 505 is disposed on the outer peripheral light guide portions 10D. As Figure 40 shown, it is preferable to have a holding member 505 that straddles the plurality of outer peripheral light guide portions 10D. Thereby, bending of the planar light source 300A can be suppressed. Further, as Figure 42Like the display device 500E shown, the holding member 505 may also be disposed on the first light guide portion 10A and the outer peripheral light guide portion 10D. Thereby, bending of the planar light source 300A can be suppressed. Further, in the case where the planar light source 300A does not include a plurality of outer peripheral light guide portions 10D, the holding member 505 may also be disposed so as to straddle a plurality of light guide portions located at the outer periphery. Thereby, bending of the planar light source can be suppressed.

[0317] In this specification, the first A main surface may sometimes be referred to as the first first main surface. The first B main surface may sometimes be referred to as the first second main surface. The second A main surface may sometimes be referred to as the second second main surface. The second B main surface may sometimes be referred to as the second second main surface. The first A side surface may sometimes be referred to as the first first side surface. The first B side surface may sometimes be referred to as the first second side surface. The first C side surface may sometimes be referred to as the first third side surface. The first D side surface may sometimes be referred to as the first fourth side surface. The second A side surface may sometimes be referred to as the second first side surface. The second B side surface may sometimes be referred to as the second second side surface. The second C side surface may sometimes be referred to as the second third side surface. The second D side surface may sometimes be referred to as the second fourth side surface.

[0318] According to one aspect of the present invention, a light emitting module includes: a light source unit including a first light source and a second light source; a light guide member including a first light guide portion and a second light guide portion, the first light guide portion including a first first main surface, a first second main surface located on the opposite side of the first first main surface, a first side surface located between the first first main surface and the first second main surface, and a first hole portion for disposing the first light source, the second light guide portion including a second first main surface, a second second main surface located on the opposite side of the second first main surface, a second side surface located between the second first main surface and the second second main surface and opposed to the first side surface, and a second hole portion for disposing the second light source; and a light reflecting member disposed between the first side surface and the second side surface. The first side surface includes a first first side surface and a first second side surface. The second side surface includes a second first side surface opposed to the first first side surface and a second second side surface opposed to the first second side surface. The light reflecting member is disposed on at least one of the first second side surface and the second second side surface so as to expose the first first side surface and the second first side surface. The distance between the first first side surface and the second first side surface is closer than the distance between the first second side surface and the second second side surface.

[0319] As Figure 34B shown, the first side surface 15 has a first first side surface, a first second side surface, a first third side surface, and a first fourth side surface. Similarly, the second side surface 16 has a second first side surface, a second second side surface, a second third side surface, and a second fourth side surface.

[0320] Hereinafter, embodiments of the present invention have been described with reference to specific examples. However, the present invention is not limited to these specific examples. All modes that those skilled in the art can implement by making appropriate design changes based on the above embodiments of the present invention, as long as they include the gist of the present invention, fall within the scope of the present invention. In addition, within the scope of the idea of the present invention, those skilled in the art can conceive of various modification examples and correction examples, and these modification examples and correction examples also fall within the scope of the present invention.

Claims

1. A light-emitting module, comprising: a light source unit including a first light source and a second light source; a light guide member including a first light guide portion and a second light guide portion, the first light guide portion including a first A main surface, a first B main surface located on the opposite side of the first A main surface, a first side surface located between the first A main surface and the first B main surface, and a first hole portion for arranging the first light source, the second light guide portion including a second A main surface, a second B main surface located on the opposite side of the second A main surface, a second side surface located between the second A main surface and the second B main surface and opposed to the first side surface, and a second hole portion for arranging the second light source; a light reflection member disposed between the first side surface and the second side surface; the first side surface includes a first A side surface and a first B side surface, the second side surface includes a second A side surface opposed to the first A side surface and a second B side surface opposed to the first B side surface, the light reflection member includes a first light reflection member disposed on the first B side surface and a second light reflection member disposed on the second B side surface, and there is an air layer between the first light reflection member and the second light reflection member; the first A side surface and the second A side surface are exposed from the light reflection member; the first A side surface and the second A side surface are in contact with air; the distance between the first A side surface and the second A side surface is closer than the distance between the first B side surface and the second B side surface.

2. The light-emitting module according to claim 1, wherein, the first light source is located on the side of the first B main surface, the first A side surface is continuous with the first A main surface, the first B side surface is continuous with the first B main surface, the second light source is located on the side of the second B main surface, the second A side surface is continuous with the second A main surface, the second B side surface is continuous with the second B main surface.

3. The light-emitting module according to claim 2, wherein, the first light reflection member is disposed to extend toward the first B main surface; the second light reflection member is disposed to extend toward the second B main surface.

4. The light-emitting module according to claim 2, wherein, on the first light reflection member, a first opening portion where the first light reflection member is not disposed is formed around the first light source in the first B main surface; on the second light reflection member, a second opening portion where the second light reflection member is not disposed is formed around the second light source in the second B main surface.

5. The light-emitting module according to any one of claims 1 to 4, wherein, the first side surface includes the first A side surface and a first C side surface located between the first A side surface and the first B side surface, the light reflection member is disposed on the first B side surface and the first C side surface.

6. The light-emitting module according to any one of claims 1 to 4, wherein, the second side surface includes the second A side surface and a second C side surface located between the second A side surface and the second B side surface, the second light reflection member is disposed on the second B side surface and the second C side surface.

7. The light-emitting module according to any one of claims 1 to 4, wherein, The length of the first B side surface in the thickness direction of the first light guide portion is longer than the length of the first A side surface in the thickness direction of the first light guide portion. The length of the second B side surface in the thickness direction of the second light guide portion is longer than the length of the second A side surface in the thickness direction of the second light guide portion.

8. The light-emitting module according to any one of claims 1 to 4, wherein, the light reflection member is a resin member containing a light diffusing agent.

9. A planar light source, comprising: a wiring substrate; the light-emitting module according to any one of claims 1 to 4, which has the first B main surface and the second B main surface facing the wiring substrate and is disposed on the wiring substrate.

Images