Planar light source

Abstract

To provide a planar light source capable of reducing a voltage drop.SOLUTION: A planar light source includes an external connection region, a first light emitting region and a second light emitting region positioned side by side sequentially in the first direction. The planar light source includes: a plurality of first light sources positioned in the first light emitting region; a plurality of second light sources positioned in the second light emitting region; a first light source first wiring electrically connected with the plurality of first light sources and extending in the first direction; and a second light source first wiring electrically connected with the plurality of second light sources and extending in the first direction. A minimum distance in the second direction from a virtual line connecting the center of the first light emitting region and the center of the second light emitting region to the second light source first wiring is shorter than a minimum distance in the second direction from the virtual line to the first light source first wiring.SELECTED DRAWING: Figure 4A

Description

[Technical Field]

[0001] FIELD An embodiment of the present invention relates to a surface light source. [Background technology]

[0002] Planar light sources including a plurality of light-emitting elements such as light-emitting diodes are widely used, for example, as backlights for liquid crystal displays, etc. For example, Patent Document 1 discloses a planar light source including a plurality of light source units and a wiring board on which the plurality of light source units are arranged. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-014593 Summary of the Invention [Problem to be solved by the invention]

[0004] There is a demand for a surface light source that has a further reduced voltage drop. An object of an embodiment of the present invention is to provide a surface light source that can reduce the voltage drop. [Means for solving the problem]

[0005] According to one aspect of the present invention, there is provided a surface light source having an external connection region, a first light-emitting region, and a second light-emitting region, which are arranged in order in a first direction, the surface light source including a plurality of first light sources located in the first light-emitting region and arranged in the first direction and a second direction perpendicular to the first direction, and a plurality of second light sources located in the second light-emitting region and arranged in the first direction and the second direction, a base including a first surface and a second surface located opposite to the first surface, first light source first wirings electrically connected to the plurality of first light sources and extending in the first direction, a plurality of first light source second wirings connected to the first light source first wirings and extending in the second direction, second light source first wirings electrically connected to the plurality of second light sources and extending in the first direction, and a base including a first surface and a second surface located opposite to the first surface, the first light source first wiring is located in the external connection region and the first light-emitting region on the first surface, the second light source first wiring is located in the external connection region, the first light-emitting region, and the second light-emitting region on the first surface, the plurality of first light source second wirings are located in the first light-emitting region on the second surface, and the plurality of second light source second wirings are located in the second light-emitting region on the second surface, and a minimum distance in the second direction from an imaginary line connecting a center of the first light-emitting region and a center of the second light-emitting region to the second light-source first wiring located in the first light-emitting region is shorter than a minimum distance in the second direction from the imaginary line to the first light-source first wiring located in the first light-emitting region. [Effects of the Invention]

[0006] According to the surface light source of the embodiment of the present invention, the voltage drop can be reduced. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 2 is a schematic top view of the surface light source according to the embodiment. [Figure 2] FIG. 2 is a schematic top view of a portion of the surface light source according to the embodiment. [Figure 3] FIG. 3 is a schematic cross-sectional view taken along line III-III in FIG. 2. [Figure 4A] 3 is a schematic bottom view of a first light-emitting region and a first external connection region of the surface light source according to the embodiment. FIG. [Figure 4B] 3 is a schematic bottom view of a first portion of a second light-emitting region of the surface light source according to the embodiment. FIG. [Figure 4C] 3 is a schematic bottom view of the area near a first external connection region of the surface light source according to the present embodiment. FIG. [Figure 5A] 4 is a schematic bottom view of a second part, a first light-emitting region, and a second external connection region of the surface light source according to the embodiment. FIG. [Figure 5B] 4 is a schematic bottom view of a second light-emitting region of a second portion of the surface light source according to the embodiment. FIG. [Figure 5C] 4 is a schematic bottom view of the area near a second external connection region of the surface light source according to the embodiment. FIG. [Figure 6A] FIG. 2 is a schematic cross-sectional view of a light source according to the present embodiment. [Figure 6B] FIG. 10 is a schematic cross-sectional view of a modified example of the light source according to the embodiment. [Figure 7A] FIG. 3 is a schematic bottom view showing a first light source first wiring and a first light source second wiring according to the present embodiment. [Figure 7B] FIG. 4 is a schematic bottom view showing a second light source first wiring and a second light source second wiring according to the embodiment. [Figure 7C] FIG. 10 is a schematic bottom view showing a third light source first wiring and a third light source second wiring according to the present embodiment. [Figure 7D] FIG. 10 is a schematic bottom view showing a fourth light source first wiring and a fourth light source second wiring according to the present embodiment. [Figure 7E] FIG. 10 is a schematic bottom view showing a fifth light source first wiring and a fifth light source second wiring according to the present embodiment. [Figure 7F] FIG. 10 is a schematic bottom view showing a sixth light source first wiring and a sixth light source second wiring according to the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, embodiments will be described with reference to the drawings. Since each drawing is a schematic illustration of an embodiment, the scale, spacing, or positional relationship of each component may be exaggerated, or some components may be omitted. In this specification, the direction of the Z-axis arrow is defined as the up direction, and the direction opposite to the Z-axis arrow is defined as the down direction. The side of the X-axis arrow is defined as the +X side, and the side opposite to the X-axis arrow is defined as the -X side. The side of the Y-axis arrow is defined as the +Y side, and the side opposite to the Y-axis arrow is defined as the -Y side. In addition, as a cross-sectional view, an end view showing only the cut surface may be shown.

[0009] In the following description, components having substantially the same functions are denoted by common reference symbols, and their descriptions may be omitted. Terms indicating specific directions or positions (e.g., "upper," "lower," and other terms including these terms) may also be used. However, these terms are merely used to facilitate understanding of relative directions or positions in the referenced drawings. As long as the relative direction or position relationship indicated by terms such as "upper" and "lower" in the referenced drawings is the same, drawings other than those disclosed herein, actual products, etc., may not necessarily be arranged identically to the referenced drawings. In this specification, "parallel" includes not only cases where two lines, sides, surfaces, etc. do not intersect even when extended, but also cases where the angle between the two lines, sides, surfaces, etc. is within a range of 10°. In this specification, the positional relationship expressed as "upper" includes cases where the two lines, sides, surfaces, etc. are in contact with each other and cases where the two lines, sides, surfaces, etc. are located above each other but are not in contact with each other.

[0010] [Embodiment] A surface light source 1000 according to an embodiment will be described with reference to Figs. 1 to 7F. Fig. 1 is a view of the surface light source 1000 as seen from the light-emitting surface side. As shown in Fig. 1, two directions that are parallel to the light-emitting surface of the surface light source 1000 and perpendicular to each other are defined as the X direction and the Y direction. The direction perpendicular to the X direction and the Y direction is defined as the Z direction. In this specification, the Z direction may be referred to as the up-down direction.

[0011] The surface light source 1000 has an external connection region 100R, a first light-emitting region 110R, and a second light-emitting region 120R, which are arranged in order in a first direction (Y direction). The surface light source 1000 includes a plurality of light sources 100 and a support 200. The plurality of light sources 100 includes a plurality of first light sources 101 and a plurality of second light sources 102. The plurality of first light sources 101 are located within the first light-emitting region 110R. The plurality of first light sources 101 are arranged side by side in the first direction (Y direction) and a second direction (X direction) perpendicular to the first direction. The plurality of second light sources 102 are located within the second light-emitting region 120R. The plurality of second light sources 102 are arranged side by side in the first direction (Y direction) and the second direction (X direction). The support 200 includes a base material 200B, a first light source first wiring 211, a plurality of first light source second wirings 212, a second light source first wiring 221, and a plurality of second light source second wirings 222. The base material 200B includes a first surface 201B and a second surface 202B located on the opposite side of the first surface. The first light source first wiring 211 is electrically connected to a plurality of first light sources 101. The first light source first wiring 211 extends in a first direction (Y direction). The plurality of first light source second wirings 212 are connected to the first light source first wiring 211. The plurality of first light source second wirings 212 extend in a second direction (X direction). The second light source first wiring 221 is electrically connected to a plurality of second light sources 102. The second light source first wiring 221 extends in the first direction (Y direction). The plurality of second light source second wirings 222 are connected to the second light source first wirings 221. The plurality of second light source second wirings 222 extend in the second direction (X direction). The first light source first wirings 211 are located on the first surface 201B of the base material 200B. The first light source first wirings 211 are located in the external connection region 100R and the first light-emitting region 110R. The first light source first wirings 211 have a portion extending in the first direction (Y direction) from a portion of the first light source first wirings 211 located in the external connection region 100R toward a portion of the first light source first wirings 211 located in the first light-emitting region 110R. The second light source first wirings 221 are located on the first surface 201B of the base material 200B. The second light source first wirings 221 are located in the external connection region 100R, the first light-emitting region 110R, and the second light-emitting region 120R.The second light source first wiring 221 has a portion extending in the first direction (Y direction) from a portion of the second light source first wiring 221 located in the external connection region 100R toward a portion of the second light source first wiring 221 located in the first light-emitting region 110R. The second light source first wiring 221 has a portion extending in the first direction (Y direction) from a portion of the second light source first wiring 221 located in the first light-emitting region 110R toward a portion of the second light source first wiring 221 located in the second light-emitting region 120R. The plurality of first light source second wirings 212 are located on the second surface 202B of the base material 200B. The plurality of first light source second wirings 212 are located in the first light-emitting region 110R. The plurality of second light source second wirings 222 are located on the second surface 202B of the base material 200B. The plurality of second light source second wirings 222 are located in the second light-emitting region 120R. A straight line connecting the center C1 of the first light-emitting region 110R and the center C2 of the second light-emitting region 120R is defined as an imaginary line IL. The minimum distance in the second direction (X direction) from the imaginary line IL to the second light source first wiring 221 located in the first light-emitting region 110R is defined as a first distance D1. The minimum distance in the second direction (X direction) from the imaginary line IL to the first light source first wiring 211 located in the first light-emitting region 110R is defined as a second distance D2. The first distance D1 is shorter than the second distance D2.

[0012] Because the first distance D1 is shorter than the second distance D2, the second light source first wiring 221 is more likely to be positioned in the center of the second light-emitting region 120R. This makes it easier to shorten the maximum length DL in the second direction (X direction) from the overlapping portion of the second light source first wiring 221 and the second light source second wiring 222 to the end of the second light source second wiring 222 in top view. This makes it easier to reduce the voltage drop caused by the second light source second wiring 222. Generally, the longer the wiring length, the greater the voltage drop.

[0013] Each element constituting the surface light source 1000 will be described in detail below. In this embodiment, the surface light source 1000 has an external connection region 100R, a first light-emitting region 110R, a third light-emitting region 130R, a fourth light-emitting region 140R, a fifth light-emitting region 150R, a sixth light-emitting region 160R, and a second light-emitting region 120R, which are arranged in order in a first direction (Y direction). The external connection region 100R is located on the -Y side of the first light-emitting region 110R. The second light-emitting region 120R is located on the +Y side of the first light-emitting region 110R. The external connection region 100R has a first external connection region 101R, a second external connection region 102R, a third external connection region 103R, and a fourth external connection region 104R, which are arranged in order in a second direction (X direction). The first external connection region 101R is located closer to the -X side than the second external connection region 102R. The first light-emitting region 110R has a first portion first light-emitting region 111R, a second portion first light-emitting region 112R, a third portion first light-emitting region 113R, and a fourth portion first light-emitting region 114R, which are arranged in order in the second direction (X direction). The second light-emitting region 120R has a first portion second light-emitting region 121R, a second portion second light-emitting region 122R, a third portion second light-emitting region 123R, and a fourth portion second light-emitting region 124R, which are arranged in order in the second direction (X direction). The third light-emitting region 130R has a first portion third light-emitting region 131R, a second portion third light-emitting region 132R, a third portion third light-emitting region 133R, and a fourth portion third light-emitting region 134R, which are arranged in order in the second direction (X direction). The fourth light-emitting region 140R has a first portion fourth light-emitting region 141R, a second portion fourth light-emitting region 142R, a third portion fourth light-emitting region 143R, and a fourth portion fourth light-emitting region 144R, which are arranged in order in the second direction (X direction). The fifth light-emitting region 150R has a first portion fifth light-emitting region 151R, a second portion fifth light-emitting region 152R, a third portion fifth light-emitting region 153R, and a fourth portion fifth light-emitting region 154R, which are arranged in order in the second direction (X direction). The sixth light-emitting region 160R has a first sixth light-emitting region 161R, a second sixth light-emitting region 162R, a third sixth light-emitting region 163R, and a fourth sixth light-emitting region 164R, which are arranged in order in the second direction (X direction). The number of light-emitting regions included in the surface light source 1000 is not particularly limited.

[0014] If one adjacent light-emitting region is defined as a first adjacent light-emitting region and the other adjacent light-emitting region is defined as a second adjacent light-emitting region, the boundary between the first adjacent light-emitting region and the second adjacent light-emitting region can be defined as follows: First, the multiple light sources located within the first adjacent light-emitting region are defined as first adjacent light sources. The multiple light sources located within the second adjacent light-emitting region are defined as second adjacent light sources. The first adjacent light source located closest to each of the multiple second adjacent light sources is defined as the first boundary light source. One of the multiple first boundary light sources is defined as the firstA boundary light source, and the second adjacent light source located closest to the firstA boundary light source is defined as the secondA boundary light source. The midpoint between the center of the firstA boundary light source and the center of the secondA boundary light source is defined as the first midpoint. Note that the midpoint is defined as a point located on a line segment with the centers of the firstA boundary light source and the secondA boundary light source as its ends, and is equidistant from both ends. Since there are multiple first boundary light sources, there are also multiple first midpoints. In this specification, a virtual line connecting multiple first midpoints can be defined as the boundary between the first adjacent light-emitting region and the second adjacent light-emitting region. For example, in this embodiment, if the first light-emitting region 110R is defined as the first adjacent light-emitting region and the third light-emitting region 130R is defined as the second adjacent light-emitting region, the boundary between them can be defined as a virtual line connecting multiple midpoints obtained by calculating the midpoints of the centers of the first light source 101 and the third light source 130R that are adjacent in the first direction (Y direction). The boundary between the first light-emitting region 110R and the third light-emitting region 130R is part of the outer edge of the first light-emitting region 110R. The boundary between the first light-emitting region 110R and the third light-emitting region 130R is part of the outer edge of the third light-emitting region 130R. Furthermore, in a portion where there is no opposing light-emitting region, the outer edge of the planar light source can be defined as the outer edge of the light-emitting region. When the surface light source has light-guiding members 340 (described later), the outer edge of each light-emitting region may be defined as a virtual straight line connecting the outer edges of the light-guiding members 340 located at the outermost periphery of each light-emitting region. Note that the outer edge of the light-guiding members 340 refers to the outer edge of the light-guiding members 340 located farther from the center of the light-emitting region. For example, the outer edge of the first light-emitting region 110R may be defined as a virtual straight line connecting the outer edges of the light-guiding members 340 located at the outermost periphery of the light-guiding members 340 covering the side surfaces of the first light source 101. In FIG. 1, the outer edges of each region are indicated by dashed lines.In this embodiment, the length of the first light-emitting region 110R in the second direction (X direction) is 0.9 to 1.1 times the length of the second light-emitting region 120R in the second direction (X direction). This makes it easier for the surface light source 1000 to have multiple rectangular light-emitting regions, making it easier to design the wiring. In addition, in this specification, the center of each light-emitting region means the center of gravity of each light-emitting region when viewed from above.

[0015] (Light source 100) As shown in FIG. 2, the surface light source 1000 has a plurality of light sources 100 arranged side by side in a first direction (Y direction) and a second direction (X direction). The plurality of light sources 100 includes a plurality of first light sources 101 and a plurality of second light sources 102. As shown in FIGS. 4A and 5A, the plurality of first light sources 101 are located within a first light-emitting region 110R. As shown in FIGS. 4B and 5B, the plurality of second light sources 102 are located within a second light-emitting region 120R. The plurality of first light sources 101 are arranged side by side in the first direction (Y direction) and the second direction (X direction). The plurality of second light sources 102 are arranged side by side in the first direction (Y direction) and the second direction (X direction).

[0016] In this embodiment, the multiple light sources 100 include multiple third light sources, multiple fourth light sources, multiple fifth light sources, and multiple sixth light sources. The multiple third light sources are located in the third light-emitting region 130R. The multiple fourth light sources are located in the fourth light-emitting region 140R. The multiple fifth light sources are located in the fifth light-emitting region 150R. The multiple sixth light sources are located in the sixth light-emitting region 160R. The multiple third light sources are arranged side by side in the first direction and the second direction. The multiple fourth light sources are arranged side by side in the first direction and the second direction. The multiple fifth light sources are arranged side by side in the first direction and the second direction. The multiple sixth light sources are arranged side by side in the first direction and the second direction.

[0017] As shown in FIG. 6A, the light source 100 includes a light emitting element 111. The light emitting element 111 includes a semiconductor stack. The semiconductor stack includes, for example, a substrate made of sapphire or gallium nitride, an n-type semiconductor layer disposed on the substrate, a p-type semiconductor layer, and a light emitting layer sandwiched between the n-type semiconductor layer and the p-type semiconductor layer. The light emitting element 111 also includes an n-side electrode electrically connected to the n-type semiconductor layer and a p-side electrode electrically connected to the p-type semiconductor layer. The n-side electrode and the p-side electrode form part of the lower surface of the light emitting element 111. The light source 100 also includes a pair of positive and negative electrodes 112. The pair of positive and negative electrodes 112 form part of the lower surface of the light source 100. One of the pair of electrodes 112 is electrically connected to the p-side electrode, and the other is electrically connected to the n-side electrode. Note that the light source 100 does not necessarily include the electrodes 112. When the light source 100 does not include a pair of positive and negative electrodes 112, the n-side electrode and p-side electrode of the light emitting element 111 form part of the lower surface of the light source 100. Furthermore, the light source 100 does not need to include a substrate such as sapphire or gallium nitride. This makes it easier to make the light source 100 smaller in the vertical direction.

[0018] The structure of the light emitting layer 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 group of active layers such as a multiple quantum well structure (MQW). The light emitting layer can emit visible light or ultraviolet light. The light emitting layer can emit visible light ranging from blue to red. Examples of semiconductor laminates including such a light emitting layer include In x Al y Ga 1-x-yN (0≦x, 0≦y, x+y≦1). The semiconductor laminate can include at least one light-emitting layer capable of emitting the above-described light. For example, the semiconductor laminate can have 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 a structure including an n-type semiconductor layer, a light-emitting layer, and a p-type semiconductor layer in that order is repeated multiple times. When the semiconductor laminate includes multiple light-emitting layers, the light-emitting layers may have different emission peak wavelengths or may have light-emitting layers with the same emission peak wavelength. Note that the same emission peak wavelength may have a variation of, for example, several nanometers. The combination of such light-emitting layers can be appropriately selected. For example, when the semiconductor laminate includes two light-emitting layers, the light-emitting layers can be selected from 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. Furthermore, the light-emitting layer may include multiple active layers with different emission peak wavelengths or multiple active layers with the same emission peak wavelength.

[0019] The light source 100 shown in FIG. 6A includes one light-emitting element 111. Each of the light sources 100, including the first light source 101, the second light source 102, the third light source, the fourth light source, the fifth light source, and the sixth light source, may include multiple light-emitting elements 111. The emission peak wavelengths of the multiple light-emitting elements included in each light source 100 may be the same or different. For example, if each light source 100 includes two light-emitting elements, the emission peak wavelengths of the light-emitting elements can be selected from combinations such as blue light and green light, blue light and red light, ultraviolet light and blue light, ultraviolet light and green light, ultraviolet light and red light, or green light and red light. For example, if each light source 100 includes three light-emitting elements, the emission peak wavelengths of the light-emitting elements can be selected from combinations such as blue light and green light and red light, ultraviolet light and green light and red light, ultraviolet light and blue light and green light, ultraviolet light and blue light and red light, or ultraviolet light and green light and red light.

[0020] 6A, the light source 100 may further include a light-transmissive member 113 (hereinafter referred to as a light-source light-transmissive member). The light-source light-transmissive member 113 covers the upper and side surfaces of the light-emitting element 111. The light-source light-transmissive member 113 can protect the light-emitting element 111. The light-source light-transmissive member 113 may be disposed so as to expose at least a portion of the upper surface of the light-emitting element 111. This makes it easier to reduce the size of the light source 100 in the vertical direction.

[0021] For example, the light source light-transmissive member 113 is translucent to the light emitted by the light emitting element 111. The light source light-transmissive member 113 includes a translucent resin and may further include a phosphor. For example, a silicone resin or an epoxy resin can be used as the translucent resin. Furthermore, the phosphor can be an yttrium-aluminum-garnet phosphor (for example, (Y,Gd)3(Al,Ga)5O 12 :Ce), lutetium aluminum garnet phosphors (e.g., Lu3(Al,Ga)5O 12 :Ce), terbium aluminum garnet phosphors (e.g., Tb3(Al,Ga)5O 12 :Ce), CCA-based phosphors (e.g., Ca 10 (PO4)6Cl2:Eu), SAE-based phosphors (e.g., Sr4Al 14 O 25 :Eu), chlorosilicate phosphors (e.g., Ca8MgSiO 16 Cl2:Eu), silicate-based phosphors (e.g., (Ba,Sr,Ca,Mg)2SiO4:Eu), β-sialon-based phosphors (e.g., (Si,Al)3(O,N)4:Eu) or α-sialon-based phosphors (e.g., Ca(Si,Al) 12 (O,N) 16 oxynitride phosphors such as (La,Y)3Si6N 11:Ce), BSESN-based phosphors (e.g., (Ba,Sr)2Si5N8:Eu), SLA-based phosphors (e.g., SrLiAl3N4:Eu), CASN-based phosphors (e.g., CaAlSiN3:Eu), or SCASN-based phosphors (e.g., (Sr,Ca)AlSiN3:Eu), etc., nitride-based phosphors, KSF-based phosphors (e.g., K2SiF6:Mn), KSAF-based phosphors (e.g., K2(Si 1-x Al x )F 6-x :Mn where x satisfies 0 < x < 1), or fluoride-based phosphors such as MGF-based phosphors (e.g., 3.5MgO·0.5MgF2·GeO2:Mn), quantum dots having a perovskite structure (e.g., (Cs,FA,MA)(Pb,Sn)(F,Cl,Br,I)3 where FA and MA represent formamidinium and methylammonium, respectively), II-VI group quantum dots (e.g., CdSe), III-V group quantum dots (e.g., InP), or quantum dots having a chalcopyrite structure (e.g., (Ag,Cu)(In,Ga)(S,Se)2), etc. can be used. As the phosphor added to the light source light-transmissive member 113, one type of phosphor may be used, or a plurality of types of phosphors may be used.

[0022] Furthermore, the wavelength conversion sheet containing the above-mentioned phosphor may be disposed above the surface light source 1000. For example, a light emitting module may include the surface light source 1000 and a wavelength conversion sheet disposed above the surface light source 1000. The surface light source 1000 emits blue light, and the wavelength conversion sheet absorbs part of the blue light from the surface light source 1000 and emits yellow light, green light, and / or red light. This allows the light emitting module to emit white light. For example, white light can be obtained by combining the light source 100 of the surface light source 1000 capable of emitting blue light with a wavelength conversion sheet containing a phosphor capable of emitting yellow light. Alternatively, the light source 100 capable of emitting blue light may be combined with a wavelength conversion sheet containing a red phosphor and a green phosphor. Alternatively, the light source 100 capable of emitting blue light may be combined with multiple 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 may be selected as the multiple wavelength conversion sheets. Furthermore, a light source 100 having a light-emitting element 111 capable of emitting blue light and a light-source translucent member 113 containing a phosphor capable of emitting red light may be combined with a wavelength conversion sheet containing a phosphor capable of emitting green light.

[0023] As the phosphor capable of emitting yellow light used in the wavelength conversion sheet, for example, the above-mentioned yttrium-aluminum-garnet phosphor is preferably used. Furthermore, as the phosphor capable of emitting green light used in the wavelength conversion sheet, it is preferable to use quantum dots with a narrow half-width of the emission peak wavelength, such as the above-mentioned perovskite structure quantum dots, III-V group quantum dots, or quantum dots with a chalcopyrite structure. Furthermore, as the phosphor capable of emitting red light used in the wavelength conversion sheet, it is preferable to use quantum dots with a narrow half-width of the emission peak wavelength, such as the above-mentioned KSF phosphors, KSAF phosphors, III-V group quantum dots, or quantum dots with a chalcopyrite structure, similar to the phosphor capable of emitting green light.

[0024] The light source 100 may further include a covering member 114. The covering member 114 is disposed on the lower surface of the light emitting element 111. The covering member 114 is disposed so that the lower surfaces of the electrodes 112 of the light source 100 are exposed from the covering member 114. The covering member 114 is also disposed on the lower surface of the light source translucent member 113 that covers the side surface of the light emitting element 111.

[0025] The covering member 114 is reflective to the light emitted by the light-emitting element 111. The covering member 114 may be made of, for example, a resin material containing a gas such as nitrogen or oxygen, or a resin material containing light-scattering particles. Examples of the resin material for the covering member 114 include thermoplastic resins such as acrylic resin, polycarbonate resin, cyclic polyolefin resin, polyethylene terephthalate resin, and polyester resin, and thermosetting resins such as epoxy resin and silicone resin. Examples of the light-scattering particles for the covering member 114 include particles of titania, silica, alumina, zinc oxide, magnesium oxide, zirconia, yttria, calcium fluoride, magnesium fluoride, niobium pentoxide, barium titanate, tantalum pentoxide, barium sulfate, and glass. The light-scattering particles for the covering member 114 may also be made of an inorganic material such as boron nitride or an alkali metal silicate. The covering member 114 may contain both gas and light-scattering particles.

[0026] As shown in FIG. 6A , the light source 100 can include a light adjustment member 115 (hereinafter referred to as a light-source light adjustment member). The light-source light adjustment member 115 constitutes at least a part of the upper surface of the light source 100. The light-source light adjustment member 115 is disposed above the light-emitting element 111. When viewed from above, the light-source light adjustment member 115 and the light-emitting element 111 overlap, and the light-source light adjustment member 115 is located above the light-emitting element 111 at the overlapping portion. The light-source light adjustment member 115 is disposed above the light-source transmissive member 113 and adjusts the amount and emission direction of light emitted from the upper surface of the light-source transmissive member 113. The light-source light adjustment member 115 is reflective and transmissive to the light emitted from the light-emitting element 111. A portion of the light emitted from the upper surface of the light-source transmissive member 113 is reflected by the light-source light adjustment member 115, and another portion is transmitted through the light-source light adjustment member 115. The transmittance of the light source light adjusting member 115 with respect to the emission peak wavelength of the light emitting element 111 is, for example, preferably 1% to 50%, and more preferably 3% to 30%. When the light source 100 includes the light source light adjusting member 115, it is possible to prevent the area directly above the light source 100 from becoming too bright. This reduces uneven brightness of the surface light source 1000.

[0027] The light source light adjustment member 115 can be made of, for example, a resin member containing light scattering particles. The resin member of the light source light adjustment member 115 can be made of the same material as the resin member of the covering member 114. The light scattering particles of the light source light adjustment member 115 can be made of the same material as the light scattering particles of the covering member 114. The light source light adjustment member 115 may also be made of, for example, a metal member such as aluminum or silver, or a dielectric multilayer film.

[0028] As shown in FIG. 6B , the light source 100 may not include the light-source light adjustment member 115. This makes it easier to downsize the light source 100 in the vertical direction compared to when the light source 100 includes the light-source light adjustment member 115 arranged above the light-emitting element 111. In another embodiment of the light source 100, the light source 100 may not include the covering member 114. For example, the lower surface of the light source unit may be formed by the lower surface of the light-emitting element, the lower surfaces of the pair of electrodes 112, and the lower surface of the light-source translucent member. In another embodiment of the light source 100, the light source 100 may include only the light-emitting element 111. In another embodiment of the light source 100, the light source 100 may not include the covering member 114 and the light-source translucent member 113, and the light-source light adjustment member 115 may be arranged on the upper surface of the light-emitting element 111. In another embodiment of the light source 100, the light source 100 may not include the light source translucent member 113, but may have a light source light adjustment member 115 arranged on the upper surface of the light emitting element 111 and a covering member 114 arranged on the lower surface of the light emitting element 111.

[0029] The shape of the light source 100 when viewed from above is not particularly limited. The shape of the light source 100 when viewed from above can be, for example, a circle, a triangle, a rectangle, a hexagon, or an octagon. When the shape of the light source 100 when viewed from above is a rectangle, a pair of outer edges of the light source 100 may be parallel to the X direction or may be inclined with respect to the X direction. In this embodiment, the pair of outer edges of the light source 100 are inclined at 45° with respect to the X direction.

[0030] (Support 200) The support 200 is a member on which the plurality of light sources 100 are mounted. As shown in FIG. 3 , the support 200 includes wiring and a base material 200B. The base material 200B includes a first surface 201B and a second surface 202B located opposite the first surface. In this embodiment, the first surface 201B is the lower surface of the base material 200B, and the second surface 202B is the upper surface of the base material 200B. Alternatively, the first surface 201B may be the upper surface of the base material 200B, and the second surface 202B may be the lower surface of the base material 200B. The base material 200B may be a rigid substrate or a flexible substrate. To reduce the thickness of the surface light source, the base material 200B is preferably a flexible substrate. The base material 200B may be formed of a single layer in the vertical direction or a laminate of multiple layers. For example, the base material 200B may be formed of a single-layer flexible substrate or a laminate of multiple rigid substrates. The material of the base material 200B may be, for example, a resin such as polyimide.

[0031] The wiring includes a plurality of first wirings 201 extending in a first direction (Y direction), a plurality of second wirings 202 extending in a second direction (X direction), and a plurality of third wirings 203. The plurality of first wirings 201 include a first light source first wiring 211 and a second light source first wiring 221. The plurality of second wirings 202 include a plurality of first light source second wirings 212 and a plurality of second light source second wirings 222. The first wirings 201 and the second wirings 202 have the same polarity, and the third wiring 203 has a polarity opposite to that of the first wirings 201 and the second wirings 202. In this embodiment, the first wirings 201 and the second wirings 202 are positive, and the third wiring 203 is negative. When the width of the first wiring 201 is greater than the width of the third wiring 203, it is preferable that the first wiring 201 be positive. The large width of the first wiring 201 on the positive electrode side makes it easier to reduce the voltage drop caused by the first wiring 201. In this specification, the width of the first wiring 201 refers to the maximum length of the first wiring 201 in a direction perpendicular to the direction in which the first wiring 201 extends. Similarly, the width of the third wiring 203 refers to the maximum length of the third wiring 203 in a direction perpendicular to the direction in which the third wiring 203 extends.

[0032] The first light source first wiring 211 is electrically connected to the plurality of first light sources 101. As shown in FIG. 7A, the first light source first wiring 211 extends in a first direction (Y direction). The first light source first wiring 211 is located on the first surface 201B of the base material 200B. As shown in FIGS. 4A, 4C, 5A, and 5C, the first light source first wiring 211 is located in the external connection region 100R and the first light-emitting region 110R. The first light source first wiring 211 located in the external connection region 100R is a portion that is connected to an external circuit for supplying power to the first light source 101. The external connection region 100R is a region that overlaps with a connector of the external circuit, etc., in a top view.

[0033] Each of the multiple first light source second wirings 212 is connected to the first light source first wiring 211. Each of the multiple first light source second wirings 212 is electrically connected to the multiple first light sources 101. As shown in FIG. 7A , the first light source second wirings 212 extend in the second direction (X direction). The first light source second wirings 212 are located on the second surface 202B of the base material 200B. The first light source second wirings 212 are located in the first light-emitting region 110R. In this embodiment, the first light source second wirings 212 are located away from the external connection region 100R and the second light-emitting region 120R. This makes it easier to reduce contact between the first light source second wirings 212 and the second light source second wirings 222.

[0034] The second light source first wiring 221 is electrically connected to the plurality of second light sources 102. As shown in FIG. 7B , the second light source first wiring 221 extends in a first direction (Y direction). The second light source first wiring 221 is located on the first surface 201B of the base material 200B. The second light source first wiring 221 is located in the external connection region 100R, the first light-emitting region 110R, and the second light-emitting region 120R. In this embodiment, the second light source first wiring 221 is located in the external connection region 100R, the first light-emitting region 110R, the second light-emitting region 120R, the third light-emitting region 130R, the fourth light-emitting region 140R, the fifth light-emitting region 150R, and the sixth light-emitting region 160R. The second light source first wiring 221 located in the external connection region 100R is a portion connected to an external circuit for supplying power to the second light source 102.

[0035] Each of the multiple second light source second wirings 222 is connected to the second light source first wiring 221. As shown in FIG. 7B , the multiple second light source second wirings 222 extend in the second direction (X direction). The second light source second wirings 222 are located on the second surface 202B of the base material 200B. The second light source second wirings 222 are located in the second light-emitting region 120R. In this embodiment, the second light source second wirings 222 are located away from the external connection region 100R and the first light-emitting region 110R. This makes it easier to reduce contact between the first light source second wirings 212 and the second light source second wirings 222.

[0036] The surface light source 1000 includes a first light source first wiring 211 electrically connected to a plurality of first light sources 101, and a second light source first wiring 221 electrically connected to a plurality of second light sources 102. In the surface light source 1000 of this embodiment, the circuit for turning on the plurality of first light sources 101 is different from the circuit for turning on the plurality of second light sources 102. This makes it easier to reduce the value of the current flowing through each of the first light source first wiring 211 and the second light source first wiring 221 compared to the value of the current flowing through the common wiring when electricity is supplied to the plurality of first light sources 101 and the plurality of second light sources 102 through the same common wiring. This makes it easier to reduce the voltage drop of the surface light source 1000. Generally, the larger the current value, the larger the voltage drop.

[0037] Each of the multiple third wirings 203 is electrically connected to the first light source 101 and the second light source 102. The third wirings 203 are located on the first surface 201B of the base material 200B. The third wirings 203 are located in the external connection region 100R and the first light-emitting region 110R. The third wirings 203 located in the external connection region 100R are connected to an external circuit for supplying power to the first light source 101 and the second light source 102. In this embodiment, the third wirings 203 are located in the external connection region 100R, the first light-emitting region 110R, the second light-emitting region 120R, the third light-emitting region 130R, the fourth light-emitting region 140R, the fifth light-emitting region 150R, and the sixth light-emitting region 160R. The third wiring 203 located in the external connection region 100R is the part that is connected to an external circuit for supplying power to the first light source 101, the second light source 102, the third light source, the fourth light source, the fifth light source, and the sixth light source.

[0038] 7C, 7D, 7E, and 7F, the plurality of first wirings 201 of this embodiment further includes a third light source first wiring 231, a fourth light source first wiring 241, a fifth light source first wiring 251, and a sixth light source first wiring 261. The third light source first wiring 231 is electrically connected to a plurality of third light sources. The fourth light source first wiring 241 is electrically connected to a plurality of fourth light sources. The fifth light source first wiring 251 is electrically connected to a plurality of fifth light sources. The sixth light source first wiring 261 is electrically connected to a plurality of sixth light sources. The third light source first wiring 231, the fourth light source first wiring 241, the fifth light source first wiring 251, and the sixth light source first wiring 261 extend in a first direction (Y direction). The third light source first wiring 231, the fourth light source first wiring 241, the fifth light source first wiring 251, and the sixth light source first wiring 261 are located on the first surface 201B of the base material 200B. The third light source first wiring 231 is located in the external connection region 100R, the first light-emitting region 110R, and the third light-emitting region 130R. The fourth light source first wiring 241 is located in the external connection region 100R, the first light-emitting region 110R, the third light-emitting region 130R, and the fourth light-emitting region 140R. The fifth light source first wiring 251 is located in the external connection region 100R, the first light-emitting region 110R, the third light-emitting region 130R, the fourth light-emitting region 140R, and the fifth light-emitting region 150R. The sixth light source first wiring 261 is located in the external connection region 100R, the first light-emitting region 110R, the third light-emitting region 130R, the fourth light-emitting region 140R, the fifth light-emitting region 150R, and the sixth light-emitting region 160R. The third light source first wiring 231 located in the external connection region 100R is a portion connected to an external circuit for supplying power to the third light source. The fourth light source first wiring 241 located in the external connection region 100R is a portion connected to an external circuit for supplying power to the fourth light source. The fifth light source first wiring 251 located in the external connection region 100R is a portion connected to an external circuit for supplying power to the fifth light source. The sixth light source first wiring 261 located in the external connection region 100R is a portion connected to an external circuit for supplying power to the sixth light source.

[0039] 7C, 7D, 7E, and 7F, the plurality of second wirings 202 of this embodiment further includes a plurality of third light source second wirings 232, a plurality of fourth light source second wirings 242, a plurality of fifth light source second wirings 252, and a plurality of sixth light source second wirings 262. The plurality of third light source second wirings 232 are connected to the third light source first wirings 231. The plurality of fourth light source second wirings 242 are connected to the fourth light source first wirings 241. The plurality of fifth light source second wirings 252 are connected to the fifth light source first wirings 251. The plurality of sixth light source second wirings 262 are connected to the sixth light source first wirings 261. The plurality of third light source second wirings 232, the plurality of fourth light source second wirings 242, the plurality of fifth light source second wirings 252, and the plurality of sixth light source second wirings 262 extend in the second direction (X direction). The plurality of third light source second wirings 232, the plurality of fourth light source second wirings 242, the plurality of fifth light source second wirings 252, and the plurality of sixth light source second wirings 262 are located on the second surface 202B of the base material 200B. The plurality of third light source second wirings 232 are located in the third light-emitting region 130R. The plurality of fourth light source second wirings 242 are located in the fourth light-emitting region 140R. The plurality of fifth light source second wirings 252 are located in the fifth light-emitting region 150R. The plurality of sixth light source second wirings 262 are located in the sixth light-emitting region 160R.

[0040] As shown in FIG. 1, a virtual line IL is a straight line connecting the center C1 of the first light-emitting region 110R and the center C2 of the second light-emitting region 120R. As shown in FIGS. 4A and 5A, a first distance D1 is a minimum distance in the second direction (X direction) from the virtual line IL to the second light source first wiring 221 located in the first light-emitting region 110R. A second distance D2 is a minimum distance in the second direction (X direction) from the virtual line IL to the first light source first wiring 211 located in the first light-emitting region 110R. The first distance D1 is preferably shorter than the second distance D2. This makes it easier for the second light source first wiring 221 to be located in the center of the second region in the second direction (X direction). This makes it easier to shorten the maximum length DL in the second direction (X direction) from the overlapping portion of the second light source first wiring 221 and the second light source second wiring 222 to the end of the second light source second wiring 222 in the top view shown in FIGS. 4B and 5B compared to when the second light source first wiring 221 is positioned offset toward the +X direction side or the −X direction side in the second direction (X direction). As a result, it is easier to reduce the voltage drop due to the second light source second wiring 222. For example, when the second light source first wiring 221 is positioned offset toward the +X direction side in the second region 120A, it is necessary to increase the length of the second light source second wiring 222 in the second direction (X direction) from the connecting portion of the second light source first wiring 221 and the second light source second wiring 222 to supply electricity to the light source positioned on the −X direction side in the second light-emitting region. When the length of the second light source second wiring 222 is increased, the voltage drop due to the second light source second wiring 222 is likely to increase. By making the first distance D1 shorter than the second distance D2 as in this embodiment, it becomes easier to shorten the maximum length in the second direction (X direction) to the end of the second light source second wiring 222. This makes it easier to reduce the voltage drop caused by the second light source second wiring 222.

[0041] 5C , a third distance D3, which is the minimum distance in the second direction (X direction) from the virtual line IL to the second light source first wiring 221 located in the external connection region 100R, is preferably shorter than a fourth distance D4, which is the minimum distance in the second direction (X direction) from the virtual line IL to the first light source first wiring 211 located in the external connection region 100R. This makes it easier for the second light source first wiring 221 to be positioned in the center of the second light-emitting region 120R. This makes it easier to shorten the maximum length in the second direction (X direction) from the connection between the second light source first wiring 221 and the second light source second wiring 222 to the end of the second light source second wiring 222, compared to when the second light source first wiring 221 is positioned offset toward the +X direction or the −X direction in the second direction (X direction). As a result, it is easier to reduce the voltage drop caused by the second light source second wiring 222.

[0042] The wiring material may be, for example, a metal film such as a copper film. Alternatively, the wiring material may be a conductive paste containing a resin and metal particles contained in the resin. The wiring resin may be, for example, an epoxy resin or a phenolic resin. The wiring metal particles may be, for example, copper or silver particles. The first wiring 201 and the second wiring 202 may be formed of the same material or different materials.

[0043] When the maximum length of the second light source first wiring 221 in the first direction (Y direction) is longer than the maximum length of the second light source second wiring 222 in the second direction (X direction), it is preferable that the volume resistivity of the second light source first wiring 221 is lower than the volume resistivity of the second light source second wiring 222. This makes it easier to reduce the voltage drop caused by the second light source first wiring 221 that is long in the first direction (Y direction). For example, a metal film can be used for the second light source first wiring 221, and a conductive paste can be used for the second light source second wiring.

[0044] The number of second light sources 102 is preferably smaller than the number of first light sources 101. The second light sources 102 located in the second light-emitting region 120R are located farther from the external connection region 100R in the first direction (Y direction) than the first light sources 101 located in the first light-emitting region 110R. For this reason, the second light source first wiring 221 electrically connected to the second light source 102 is more likely to experience a larger voltage drop than the first light source first wiring 211 electrically connected to the first light source 101. By having fewer second light sources 102 than the number of first light sources 101, it becomes easier to reduce the voltage required to turn on the multiple second light sources 102 electrically connected to the second light source first wiring 221, which is more likely to experience a large voltage drop. In this embodiment, as shown in Fig. 4A, the number of first light sources 101 located in the first light-emitting region 111R, which is one of the first light-emitting regions 110R, is 50, and as shown in Fig. 4B, the number of second light sources 102 located in the first second light-emitting region 121R, which is one of the second light-emitting regions 120R, is 40. Furthermore, as shown in Fig. 5A, the number of first light sources 101 located in the second first light-emitting region 112R is 55, and as shown in Fig. 5B, the number of second light sources 102 located in the second second light-emitting region 122R is 44.

[0045] The maximum number of second light sources 102 electrically connected to one of the plurality of second light source second wirings 222 is preferably smaller than the maximum number of first light sources 101 electrically connected to one of the plurality of first light source second wirings 212. The second light sources 102 located in the second light-emitting region 120R are located farther from the external connection region 100R in the first direction (Y direction) than the first light sources 101 located in the first light-emitting region 110R. For this reason, the second light source first wiring 221 electrically connected to the second light source 102 is more likely to experience a larger voltage drop than the first light source first wiring 211 electrically connected to the first light source 101. Since the maximum number of second light sources 102 electrically connected to one of the plurality of second light source second wirings 222 connected to the second light source first wiring 221 is smaller than the maximum number of first light sources 101 electrically connected to one of the plurality of first light source second wirings 212, it becomes easier to reduce the voltage required to light up the plurality of second light sources 102. This makes it easier to reduce the voltage required to turn on the multiple second light sources 102 electrically connected to the second light source first wiring 221, which is prone to a large voltage drop. In this embodiment, as shown in FIG. 5A , the maximum number of first light sources 101 electrically connected to one of the multiple first light source second wirings 212 located in the second part first light-emitting region 112R is nine, and as shown in FIG. 5B , the maximum number of second light sources 102 electrically connected to one of the multiple second light source second wirings 222 located in the second part second light-emitting region 122R is eight. Note that the maximum number of second light sources 102 electrically connected to one of the multiple second light source second wirings 222 may be greater than the maximum number of first light sources 101 electrically connected to one of the multiple first light source second wirings 212.

[0046] The multiple first-light-source-second wirings 212 may include a first-light-source-2A wiring 212A and a first-light-source-2B wiring 212B. The first-light-source-2A wiring 212A is one of the multiple first-light-source-2 wirings 212. The first-light-source-2B wiring 212B is one of the multiple first-light-source-2 wirings 212. The length of the first-light-source-2B wiring 212B in the first direction (Y direction) is longer than the length of the first-light-source-2A wiring 212A in the first direction (Y direction). It is preferable that the maximum number of first light sources 101 electrically connected to the first-light-source-2B wiring 212B is smaller than the maximum number of first light sources 101 electrically connected to the first-light-source-2A wiring 212A. The first-light-source-2B wiring 212B, which has a longer length in the first direction (Y direction), is more likely to have a larger voltage drop than the first-light-source-2A wiring 212A. 4A , the maximum number of first light sources 101 electrically connected to the first-light-source 2B wiring 212B is smaller than the maximum number of first light sources 101 electrically connected to the first-light-source 2A wiring 212A, which makes it easier to reduce the voltage required to turn on the first light sources 101 electrically connected to the first-light-source 2B wiring 212B. In this embodiment, as shown in FIG. 4A , the maximum number of first light sources 101 electrically connected to the first-light-source 2A wiring 212A located in the first-part first light-emitting region 111R is seven, and the maximum number of first light sources 101 electrically connected to the first-light-source 2B wiring 212B located in the first-part second light-emitting region 121R is six. In this embodiment, as shown in FIG. 5A, the maximum number of first light sources 101 electrically connected to the first light source 2A wiring 212A located in the second part first light-emitting area 112R is nine, and the maximum number of first light sources 101 electrically connected to the first light source 2B wiring 212B located in the first part second light-emitting area 121R is four.

[0047] 4A and 5A, it is preferable that a part of the outer edge of one of the opposing first-light-source 2A wirings 212A and a part of the outer edge of the other of the opposing first-light-source 2B wirings 212B are parallel to each other in bottom view, thereby reducing short-circuiting between the first-light-source 2A wiring 212A and the first-light-source 2B wiring 212B.

[0048] The plurality of second light source second wirings 222 may include a second light source 2A wiring 222A and a second light source 2B wiring 222B. The second light source 2A wiring 222A is one of the plurality of second light source second wirings 222. The second light source 2B wiring 222B is one of the plurality of second light source second wirings 222. The length of the second light source 2B wiring 222B in the first direction (Y direction) is longer than the length of the second light source 2A wiring 222A in the first direction (Y direction). It is preferable that the maximum number of second light sources 102 electrically connected to the second light source 2B wiring 222B is smaller than the maximum number of second light sources 102 electrically connected to the second light source 2A wiring 222A. The second light source 2B wiring 222B, which is longer in the first direction (Y direction), is more likely to have a larger voltage drop than the second light source 2A wiring 222A. Because the maximum number of second light sources 102 electrically connected to the second-light-source 2B wiring 222B is smaller than the maximum number of second light sources 102 electrically connected to the second-light-source 2A wiring 222A, it becomes easier to reduce the voltage required to turn on the first light sources 101 electrically connected to the second-light-source 2B wiring 222B. In this embodiment, as shown in FIG. 4B , the maximum number of second light sources 102 electrically connected to the second-light-source 2A wiring 222A located in the first-part second light-emitting region 121R is eight, and the maximum number of second light sources 102 electrically connected to the second-light-source 2B wiring 222B is two. In this embodiment, as shown in FIG. 5B , the maximum number of second light sources 102 electrically connected to the second-light-source 2A wiring 222A located in the second-part second light-emitting region 122R is eight, and the maximum number of second light sources 102 electrically connected to the second-light-source 2B wiring 222B is three.

[0049] 4B and 5B, it is preferable that a part of the outer edge of one of the opposing second-light-source 2A wirings 222A and a part of the outer edge of the other of the opposing second-light-source 2B wirings 222B are parallel to each other in bottom view, thereby reducing short-circuiting between the second-light-source 2A wiring 222A and the second-light-source 2B wiring 222B.

[0050] 5B, in the second direction (X direction), at least one second light source 102 electrically connected to the second light source 2A wiring 222A may be located between multiple second light sources 102 electrically connected to the second light source 2B wiring 222B. This makes it easier to shorten the length of the second element third wiring 223 in the second direction (X direction). This makes it easier to reduce the voltage drop caused by the second light source 2A wiring 222A.

[0051] 4B and 5B, the second light source first wiring 221 may include a first wiring first portion 211A extending in the second direction (X direction) and electrically connected to the plurality of second light sources 102. The first wiring first portion 211A is a part of the second light source first wiring 221 and is located on the first surface 201B. The plurality of second light sources 102 include a second light source first portion 121A electrically connected to the first wiring first portion 211A and a second light source second portion 121B electrically connected to the second light source second wiring 222. The first wiring first portion 211A is located farther from the external connection region 100R in the first direction (Y direction) than the second light source second wiring 222. It is preferable that the volume resistivity of the second light source first wiring 221 is lower than the volume resistivity of the second light source second wiring 222. This makes it easier to reduce the voltage required to light up the second light source first section 121A, which is positioned farther from the external connection region 100R in the first direction (Y direction) than the second light source second section 121B.

[0052] 3, it is preferable that the maximum length D5 from the surface of the second wiring 202 located opposite the surface facing the second surface 202B to the second surface 202B in the vertical direction be longer than the length D6 from the surface of the first wiring 201 located opposite the surface facing the first surface 201B to the first surface 201B. This makes it easier to make the second wiring 202 thicker. This makes it easier to reduce the voltage drop caused by the second wiring 202. In particular, when the volume resistivity of the second wiring 202 is higher than the volume resistivity of the first wiring 201, it is preferable that the maximum length D5 from the surface of the second wiring 202 located opposite the surface facing the second surface 202B to the second surface 202B in the vertical direction be longer than the length D6 from the surface of the first wiring 201 located opposite the surface facing the first surface 201B to the first surface 201B.

[0053] In this embodiment, a portion of the first light source second wiring 212 is located within the via 200A of the base material 200B. As a result, each of the multiple first light source second wirings 212 is connected to the first light source first wiring 211. It is preferable that the first light source second wiring 212 is connected to the first light source first wiring 211 at multiple locations. This makes it easier to reduce the possibility of a portion of the electrical circuit being disconnected. In this embodiment, a portion of the second light source second wiring 222 is located within the via 200A of the base material 200B. As a result, each of the multiple second light source second wirings 222 is connected to the second light source first wiring 221. It is preferable that the second light source second wiring 222 is connected to the second light source first wiring 221 at multiple locations.

[0054] As shown in FIGS. 4A and 4B , the support body 200 may include a plurality of reinforcing members 204. The reinforcing members 204 have a higher hardness than the base material 200B. In the second direction (X direction), it is preferable that the first light source first wiring 211 and the second light source first wiring 221 are positioned between the plurality of reinforcing members 204. This can improve the mechanical strength of the support body 200. This makes it easier to improve the reliability of the first light source first wiring 211 and the second light source first wiring 221. In this embodiment, the reinforcing members 204 are positioned on the first surface 201B. In a top view, it is preferable that the reinforcing members 204 are positioned away from the first wiring 201. This makes it easier to miniaturize the surface light source 1000 in the vertical direction. The reinforcing members 204 may be formed of the same material as the first wiring 201. For example, when the first wiring 201 and the reinforcing member 204 are formed of a metal film, the first wiring 201 and the reinforcing member 204 can be formed by etching the metal film provided on the entire first surface 201B of the base material 200B. Note that the reinforcing member 204 may be formed of a material different from that of the first wiring 201.

[0055] The surface light source 1000 may be cut so that portions of the first wiring 201, second wiring 202, and third wiring 203 electrically connected to any light source 100 remain. It is preferable to cut the surface light source 1000 so that the first wiring 201, second wiring 202, and third wiring 203 located in the external connection region remain. For example, when the surface light source 1000 is electrically connected to an external circuit via a wiring substrate for supplying electricity, the first wiring 201, second wiring 202, and third wiring 203 located in the external connection region 100R remain, allowing the same wiring substrate for supplying electricity to be used before and after cutting. For example, the surface light source 1000 may be cut at a cutting position CL shown in FIG. 5A. The surface light source after cutting includes 15 light sources 100. In this manner, the number of light sources 100 included in the surface light source can be changed as desired.

[0056] It is preferable that the reinforcing member 204 is not located at the cutting position CL. This makes it easier to cut the surface light source. The multiple reinforcing members 204 preferably include a first reinforcing member 204A that overlaps the first light source 101 in the second direction (X direction) and a second reinforcing member 204B that overlaps the second light source in the second direction (X direction). This creates a portion in the first direction (Y direction) where the reinforcing member 204 is not located between the first reinforcing member 204A and the second reinforcing member 204B. The creation of a portion in the first direction (Y direction) where the reinforcing member 204 is not located increases the area of ​​the portion of the surface light source 1000 that is easy to cut. Note that the reinforcing member 204 may extend in the first direction (Y direction) so that the portion overlapping the first light source 101 and the portion overlapping the second light source 102 in the second direction (X direction) are connected. This makes it easier to improve the mechanical strength of the support body 200.

[0057] As shown in FIG. 5A , it is preferable that all of the first light source first wirings 211 located in the first light-emitting region 110R are located inside the pair of first light sources 101 located at both ends in the second direction (X direction). In other words, it is preferable that all of the first light source first wirings 211 located in the first light-emitting region 110R are located closer to the -X side than the first light source 101 located closest to the +X side in the second direction (X direction), and that all of the first light source first wirings 211 located in the first light-emitting region 110R are located closer to the +X side than the first light source 101 located closest to the -X side in the second direction (X direction). This reduces the number of cutting positions at which the first light source first wirings 211 are separated when cutting the surface light source in the first direction (Y direction). This makes it easier to change the size of the surface light source. It is preferable that all of the second light source first wirings 221 located in the first light-emitting region 110R are located inside the pair of first light sources 101 located at both ends in the second direction (X direction). This makes it possible to reduce the number of cutting positions where the second light source first wiring 221 is divided when cutting the surface light source in the first direction, thereby making it easier to change the size of the surface light source.

[0058] As shown in FIG. 3, the support 200 may further include a first adhesive layer 301 disposed on the substrate 200B, a reflective member 310 disposed on the first adhesive layer 301, and a second adhesive layer 302 disposed on the reflective member 310.

[0059] The first adhesive layer 301 is disposed between the base material 200B and the reflecting member 310, and bonds the base material 200B and the reflecting member 310 together. The first adhesive layer 301 can be made of, for example, a resin material containing light-scattering particles. The resin material of the first adhesive layer 301 can be made of, for example, the same material as the resin material of the covering member 114. The light-scattering particles of the first adhesive layer 301 can be made of, for example, the same material as the light-scattering particles of the covering member 114. The first adhesive layer 301 can be made of, for example, a sheet-shaped optically transparent adhesive (OCA).

[0060] The reflecting member 310 has reflectivity to the light emitted by the light source 100. It is disposed below the light source 100. The reflecting member 310 can be made of a resin member and a reflector contained in the resin member. For example, the same material as the resin member of the covering member 114 can be used as the resin member of the reflecting member 310. The same material as the light scattering particles of the covering member 114 can be used as the reflector material of the reflecting member 310. A gas such as nitrogen or oxygen may be used as the reflector of the reflecting member 310. Furthermore, the reflecting member 310 may contain both light scattering particles and a gas as the reflector.

[0061] The second adhesive layer 302 is disposed between the reflecting member 310 and the light source 100, and bonds the reflecting member 310 and the light source 100 together. The light source 100 is disposed on the second adhesive layer 302. The second adhesive layer 302 may be formed of, for example, a resin material containing light-scattering particles. The resin material of the second adhesive layer 302 may be made of, for example, the same material as the resin material of the covering member 114. The light-scattering particles of the second adhesive layer 302 may be made of, for example, the same material as the light-scattering particles of the covering member 114. The second adhesive layer 302 may be formed of, for example, a sheet-shaped optically transparent adhesive (OCA).

[0062] The support 200 further includes a conductive member 320. The conductive member 320 may be made of, for example, a conductive paste. As shown in FIG. 3 , the conductive member 320 is in contact with the electrode 112 of the light source 100. The conductive member 320 is electrically connected to the light source 100.

[0063] The conductive member 320 has a connection portion 321 and an extension portion 322. The connection portion 321 penetrates the second adhesive layer 302, the reflective member 310, the first adhesive layer 301, and the base material 200B in the vertical direction. A pair of conductive members 320 are arranged spaced apart from each other to correspond to a pair of positive and negative electrodes 112 of the light source 100. The connection portion 321 of one conductive member 320 is connected to the positive electrode 112 below the light source 100, and the connection portion 321 of the other conductive member 320 is connected to the negative electrode 112 below the light source 100. The extension portion 322 extends from the connection portion 321 and is electrically connected to the wiring of the support body 200. The connection portion 321 and the extension portion 322 can be integrally formed from the same material.

[0064] The support 200 preferably further includes an insulating layer 330 that protects the lower surface of the base material 200B. In this embodiment, the insulating layer 330 is disposed on the lower surface of the base material 200B and covers the first wiring 201 and the third wiring 203. The insulating layer 330 may be made of, for example, epoxy resin, urethane resin, or acrylic resin. 4A to 5C are schematic bottom views of a portion of the surface light source without the insulating layer 330.

[0065] (Light guiding member 340) 3, the surface light source 1000 may have a light guiding member 340 arranged to cover the side surface of the light source 100. The light guiding member 340 is a member that is translucent to the light emitted by the light source 100. The transmittance of the light guiding member 340 with respect to the emission peak wavelength of the light source 100 is, for example, preferably 60% or more, and more preferably 80% or more. The light guiding member 340 has a first light guiding surface 341 that is the light emitting surface of the surface light source 1000, and a second light guiding surface 342 located on the opposite side of the first light guiding surface 341.

[0066] The light guiding member 340 continuously surrounds the light source 100 in a top view. In this embodiment, the light guiding member 340 has a hole 10H that penetrates from the first light guiding surface 341 to the second light guiding surface 342. The light source 100 is disposed in the hole 10H of the light guiding member 340. In this embodiment, the hole 10H is circular in a top view. The hole 10H may be elliptical, or may have a polygonal shape such as a triangle, a rectangle, a hexagon, or an octagon in a top view. The hole 10H may be a recess that is open only on the second light guiding surface 342 side of the light guiding member 340. The light guiding member 340 may be provided so as to contact a side surface of the light source 100. The light guiding member 340 may be provided so as to contact the top surface and side surfaces of the light source 100.

[0067] In this embodiment, each of the plurality of light-guiding members 340 is a different light-guiding region 10RA. One light-guiding region 10RA can be used as a driving unit for local dimming. The number of light-guiding regions 10RA constituting the surface light source 1000 is not particularly limited. For example, the surface light source 1000 may include one light-guiding region 10RA, or, as in this embodiment, the surface light source 1000 may include multiple light-guiding regions 10RA. Furthermore, a surface light source device with a larger area may be formed by arranging multiple surface light sources 1000.

[0068] 2, the plurality of light-guiding members 340 are preferably arranged with gaps 34G between them. This reduces warping of the support 200 caused by the difference in thermal expansion coefficient between the light-guiding members 340 and the support 200. This reduces the occurrence of cracks in the conductive member 320. The plurality of light-guiding members 340 are preferably arranged with gaps between them.

[0069] The light guiding member 340 preferably has a recess 343 that opens to the first light guiding surface 341 or the second light guiding surface 342. This makes it easier to increase the surface area of ​​the light guiding member 340. This makes it easier to increase the amount of light that is extracted from the surface of the light guiding member 340 to the outside of the light guiding member 340, making it easier to improve the light extraction efficiency of the surface light source 1000. The light guiding member 340 may have through holes that open to the first light guiding surface 341 and the second light guiding surface 342. This makes it easier to increase the surface area of ​​the light guiding member 340.

[0070] The shape of the recesses 343 of the light-guiding member 340 is not particularly limited. As shown in FIG. 2 , the shape of the recesses 343 of the light-guiding member 340 of this embodiment may include a linear portion. In this specification, the term "linear" includes a straight line, a curved line, a bent line, and the like. For example, the shape of the recesses 343 of the light-guiding member 340 in a top view may include a V-shaped or L-shaped portion extending in two directions. The shape of the recesses 343 of the light-guiding member 340 in a top view may be a circle, a triangle, a rectangle, a hexagon, an octagon, or the like. The shape and / or the number of the recesses 343 of the multiple light-guiding members 340 may be the same, or the shape and / or the number of at least one recess 343 of the multiple light-guiding members 340 may be different.

[0071] The light guide member 340 may be made of the same material as the resin material of the covering member 114. Alternatively, the light guide member 340 may be made of glass or the like. The light guide member 340 may contain a phosphor or light scattering particles.

[0072] The thickness of the light-guiding member 340 is preferably, for example, 150 μm or more and 800 μm or less. The light-guiding member 340 may be configured as a single layer in the vertical direction, or may be configured as a laminate of multiple layers. When the light-guiding member 340 is configured as a laminate, a light-transmitting adhesive may be disposed between each layer. Each layer of the laminate may use a different type of main material.

[0073] (Translucent member 350) As shown in FIG. 3 , the surface light source 1000 may include a light-transmitting member 350. The light-transmitting member 350 is a member that transmits light emitted by the light source 100. The light-transmitting member 350 has a first light-transmitting portion 351 and a second light-transmitting portion 352. In this embodiment, the first light-transmitting portion 351 and the second light-transmitting portion 352 are separate bodies. The first light-transmitting portion 351 and the second light-transmitting portion 352 may be integrally formed from the same material. The transmittance of each of the first light-transmitting portion 351 and the second light-transmitting portion 352 with respect to the emission peak wavelength of the light source 100 is, for example, preferably 60% or more, and more preferably 80% or more.

[0074] 3, the first light-transmitting portion 351 is preferably in contact with a side surface of the light source 100. This makes it easier for light from the light source 100 to enter the first light-transmitting portion 351. The first light-transmitting portion 351 is preferably in contact with the light-guiding member 340. This makes it easier for light from the light source 100 to enter the light-guiding member 340.

[0075] The first light-transmitting portion 351 is preferably arranged so as to expose at least a portion of the upper surface of the light source 100. This makes it easier to downsize the surface light source 1000 in the vertical direction compared to when the first light-transmitting portion 351 covers the entire upper surface of the light source 100. The first light-transmitting portion 351 may be arranged so as to expose the entire upper surface of the light source 100. Alternatively, the first light-transmitting portion 351 may cover the entire upper surface of the light source 100. Covering the entire upper surface of the light source 100 with the first light-transmitting portion 351 makes it easier to adjust the luminance in the region directly above the light source 100. For example, the luminance in the region directly above the light source 100 can be adjusted by changing the thickness of the first light-transmitting portion 351 in the portion covering the upper surface of the light source 100. This facilitates luminance adjustment, making it easier to reduce luminance unevenness in the surface light source 1000. When first light transmitting portion 351 covers the upper surface of light source 100, second light transmitting portion 352 covers the upper surface of light source 100 via first light transmitting portion 351.

[0076] The first light transmitting portion 351 may be configured as a single layer in the vertical direction, or may be configured as a laminate of multiple layers. The first light transmitting portion 351 may also contain phosphors and light scattering particles. When the first light transmitting portion 351 is a laminate, each layer may or may not contain phosphors and / or light scattering particles. For example, the first light transmitting portion 351 may be configured as a layer containing phosphors and a layer not containing phosphors. The first light transmitting portion 351 may be made of a material similar to that of the resin member of the covering member 114, for example.

[0077] The second light-transmitting portion 352 is located above the light source 100. The second light-transmitting portion 352 is located above the first light-transmitting portion 351. The second light-transmitting portion 352 is preferably in contact with the upper surface of the light source 100 and / or the upper surface of the first light-transmitting portion 351. This makes it easier to downsize the surface light source 1000 in the vertical direction.

[0078] The second light-transmitting portion 352 may be made of, for example, the same material as the resin material of the covering member 114. Alternatively, the second light-transmitting portion 352 may be made of, for example, a sheet-like optical transparent adhesive (OCA). The second light-transmitting portion 352 may contain a phosphor or light-scattering particles.

[0079] (Light adjustment member 360) As shown in FIG. 3 , the surface light source 1000 may include a light adjusting member 360. The light adjusting member 360 has reflectivity and translucency for light emitted from the light source 100. A portion of the light emitted from the light source 100 is reflected by the light adjusting member 360, and another portion is transmitted through the light adjusting member 360. The transmittance of the light adjusting member 360 for the peak emission wavelength of the light source 100 is lower than the transmittance of the light guiding member 340 for the peak emission wavelength of the light source 100. For example, the transmittance of the light adjusting member 360 for the peak emission wavelength of the light source 100 is preferably 1% or more and 50% or less, and more preferably 3% or more and 30% or less. The light adjusting member 360 may be formed of a single layer or a laminate of multiple layers.

[0080] The light adjustment member 360 is disposed above the light source 100. When viewed from above, the light adjustment member 360 and the light source 100 overlap, and the light adjustment member 360 is located above the light source 100 at the overlapping portion. By positioning the light adjustment member 360 above the light source 100, it is possible to prevent the area directly above the light source 100 from becoming too bright.

[0081] 2, it is preferable that at least a part of the outer edge of the light adjustment member 360 is located outside the outer edges of the holes 10H of the light guide member 340 in a top view. This can prevent the areas near the outer edges of the holes 10H from becoming too bright. In a top view, the entire outer edge of the light adjustment member 360 may be located outside the outer edges of the holes 10H. This can further prevent the areas near the outer edges of the holes 10H from becoming too bright.

[0082] The light adjustment member 360 may have a light adjustment through-hole 361 that is a through-hole. When the light adjustment member 360 has the light adjustment through-hole 361, it becomes easy to adjust the brightness in the area directly above the light adjustment member 360. For example, by changing the size and position of the light adjustment through-hole 361, it is possible to adjust the light from the light source 100 that is blocked by the light adjustment member 360. This makes it easy to adjust the brightness in the area directly above the light adjustment member 360, which makes it easier to reduce brightness unevenness of the surface light source 1000.

[0083] The light adjustment through-hole 361 of the light adjustment member 360 is preferably positioned away from the light source 100 in top view. In this way, it is possible to prevent the area directly above the light source 100 from becoming too bright.

[0084] The shape of the light adjustment through-hole 361 when viewed from above is not particularly limited. As shown in Fig. 2, the shape of the light adjustment through-hole 361 when viewed from above may be circular. The shape of the light adjustment through-hole 361 when viewed from above may be elliptical, or polygonal, such as triangular, rectangular, hexagonal, or octagonal. The shape of the light adjustment through-hole 361 when viewed from above may include a linear portion.

[0085] It is preferable that a plurality of light adjustment through-holes 361 surround the light source 100 in top view. This makes it easier to adjust the brightness of the surface light source 1000 in the X direction and / or Y direction. Furthermore, one light adjustment through-hole 361 may continuously surround the light source 100 in top view. This makes it easier to adjust the brightness of the surface light source 1000 in the X direction and / or Y direction.

[0086] The light adjusting member 360 can be configured by a resin member and a reflector contained in the resin member. For example, the same material as the resin member of the covering member 114 can be used as the resin member of the light adjusting member 360. The same material as the light scattering particles of the covering member 114 can be used as the reflector material of the light adjusting member 360. A gas such as nitrogen or oxygen may be used as the reflector of the light adjusting member 360. Furthermore, the light adjusting member 360 may contain both light scattering particles and a gas as the reflector.

[0087] The present specification includes the following embodiments. Item 1. A surface light source having an external connection area, a first light-emitting area, and a second light-emitting area arranged in a first direction, a plurality of light sources including a plurality of first light sources located in the first light-emitting region and arranged side by side in the first direction and a second direction perpendicular to the first direction, and a plurality of second light sources located in the second light-emitting region and arranged side by side in the first direction and the second direction; a support including: a base including a first surface and a second surface located opposite to the first surface; first light source first wirings electrically connected to a plurality of the first light sources and extending in the first direction; a plurality of first light source second wirings connected to the first light source first wirings and extending in the second direction; second light source first wirings electrically connected to the plurality of second light sources and extending in the first direction; and a plurality of second light source second wirings connected to the second light source first wirings and extending in the second direction, the first light source first wiring is located in the external connection region and the first light-emitting region on the first surface, the second light source first wiring is located in the external connection region, the first light-emitting region, and the second light-emitting region on the first surface, The plurality of first light source second wirings are located in the first light-emitting region on the second surface, The plurality of second light source second wirings are located in the second light-emitting region on the second surface, A surface light source in which the minimum distance in the second direction from a virtual line connecting the center of the first light-emitting region and the center of the second light-emitting region to the second light source first wiring located within the first light-emitting region is shorter than the minimum distance in the second direction from the virtual line to the first light source first wiring located within the first light-emitting region. Item 2. A surface light source according to Item 1, wherein the minimum distance in the second direction from the virtual line to the second light source first wiring located within the external connection region is shorter than the minimum distance in the second direction from the virtual line to the first light source first wiring located within the external connection region. Item 3. The surface light source according to item 1 or 2, wherein the number of the second light sources is smaller than the number of the first light sources. Item 4. The surface light source according to any one of Items 1 to 3, wherein the maximum number of the second light sources electrically connected to one of the plurality of second light source second wirings is less than the maximum number of the first light sources electrically connected to one of the plurality of first light source second wirings. Item 5. The plurality of first light source second wirings include first light source secondA wirings and first light source secondB wirings, a length of the first light source 2B wiring in the first direction is longer than a length of the first light source 2A wiring in the first direction; Item 5. The surface light source according to any one of items 1 to 4, wherein the maximum number of the first light sources electrically connected to the first light source 2B wiring is less than the maximum number of the first light sources electrically connected to the first light source 2A wiring. Item 6. The plurality of second light source second wirings include second light source secondA wirings and second light source secondB wirings, a length of the second light source 2B wiring in the first direction is longer than a length of the second light source 2A wiring in the first direction; Item 6. The surface light source according to any one of items 1 to 5, wherein the maximum number of the second light sources electrically connected to the second light source 2B wiring is less than the maximum number of the second light sources electrically connected to the second light source 2A wiring. Item 7. A surface light source according to item 6, wherein in the second direction, at least one second light source electrically connected to the second light source 2A wiring is located between a plurality of second light sources electrically connected to the second light source 2B wiring. Item 8. The maximum length of the second light source first wiring in the first direction is longer than the maximum length of the second light source second wiring in the second direction; 8. The surface light source according to any one of items 1 to 7, wherein the volume resistivity of the second light source first wiring is lower than the volume resistivity of the second light source second wiring. Item 9. The second light source first wiring extends in the second direction, is electrically connected to a plurality of the second light sources, and includes a first wiring first portion that is positioned farther from the external connection region in the first direction than the second light source second wiring; Item 9. The surface light source according to any one of items 1 to 8, wherein the volume resistivity of the second light source first wiring is lower than the volume resistivity of the second light source second wiring. Item 10. The support includes a plurality of reinforcing members having a higher hardness than the base material, 10. The surface light source according to any one of items 1 to 9, wherein at least a portion of the first light source first wiring and at least a portion of the second light source first wiring are positioned between the plurality of reinforcing members in the second direction. Item 11. The surface light source according to Item 10, wherein the plurality of reinforcing members include a first reinforcing member that overlaps with the first light source in the second direction, and a second reinforcing member that overlaps with the second light source in the second direction.

[0088] The embodiments of the present invention have been described above with reference to specific examples. However, the present invention is not limited to these specific examples. All forms that can be implemented by a person skilled in the art through appropriate design modifications based on the above-described embodiments of the present invention also fall within the scope of the present invention as long as they include the gist of the present invention. In addition, a person skilled in the art may come up with various modifications and alterations within the scope of the concept of the present invention, and these modifications and alterations also fall within the scope of the present invention. [Explanation of symbols]

[0089] 100 light sources 101 1st light source 102 Second light source 200 Support 200B base material 201B 1st page 202B 2nd page 211 1st light source 1st wiring 212 1st light source 2nd wiring 221 2nd light source 1st wiring 222 2nd light source 2nd wiring 100R External connection area 110R First light-emitting area 120R Second light-emitting area 1000 planar light source IL Virtual Line

Claims

1. A surface light source having an external connection region, a first light-emitting region, and a second light-emitting region, which are arranged in order in a first direction, a plurality of light sources including a plurality of first light sources located in the first light-emitting region and arranged side by side in the first direction and a second direction perpendicular to the first direction, and a plurality of second light sources located in the second light-emitting region and arranged side by side in the first direction and the second direction; a base including a first surface and a second surface located opposite to the first surface; and a support including first light source first wirings electrically connected to the plurality of first light sources and extending in the first direction, a plurality of first light source second wirings connected to the first light source first wirings and extending in the second direction, second light source first wirings electrically connected to the plurality of second light sources and extending in the first direction, and a plurality of second light source second wirings connected to the second light source first wirings and extending in the second direction, the first light source first wiring is located in the external connection region and the first light-emitting region on the first surface, the second light source first wiring is located in the external connection region, the first light-emitting region, and the second light-emitting region on the first surface, The plurality of first light source second wirings are located in the first light-emitting region on the second surface, The plurality of second light source second wirings are located in the second light-emitting region on the second surface, A surface light source in which the minimum distance in the second direction from a virtual line connecting the center of the first light-emitting region and the center of the second light-emitting region to the second light source first wiring located within the first light-emitting region is shorter than the minimum distance in the second direction from the virtual line to the first light source first wiring located within the first light-emitting region.

2. 2. The surface light source of claim 1, wherein the minimum distance in the second direction from the virtual line to the second light source first wiring located within the external connection area is shorter than the minimum distance in the second direction from the virtual line to the first light source first wiring located within the external connection area.

3. The surface light source according to claim 1 or 2, wherein the number of the second light sources is smaller than the number of the first light sources.

4. 3. The surface light source according to claim 1, wherein the maximum number of the second light sources electrically connected to one of the plurality of second light source second wirings is less than the maximum number of the first light sources electrically connected to one of the plurality of first light source second wirings.

5. the plurality of first light source second wirings include first light source secondA wirings and first light source secondB wirings, a length of the first light source second-B wiring in the first direction is longer than a length of the first light source second-A wiring in the first direction; 3. The surface light source according to claim 1, wherein the maximum number of the first light sources electrically connected to the first light source second B wiring is less than the maximum number of the first light sources electrically connected to the first light source second A wiring.

6. the plurality of second light source second wirings include second light source secondA wirings and second light source secondB wirings, a length of the second light source 2B wiring in the first direction is longer than a length of the second light source 2A wiring in the first direction; 3. The surface light source according to claim 1, wherein the maximum number of the second light sources electrically connected to the second light source second B wiring is less than the maximum number of the second light sources electrically connected to the second light source second A wiring.

7. 7. The surface light source according to claim 6, wherein in the second direction, at least one second light source electrically connected to the second light source second A wiring is located between a plurality of second light sources electrically connected to the second light source second B wiring.

8. a maximum length of the second light source first wiring in the first direction is longer than a maximum length of the second light source second wiring in the second direction; 3. The surface light source according to claim 1, wherein the volume resistivity of the second light source first wiring is lower than the volume resistivity of the second light source second wiring.

9. the second light source first wiring extends in the second direction, is electrically connected to the plurality of second light sources, and includes a first wiring first portion located farther from the external connection region in the first direction than the second light source second wiring, 3. The surface light source according to claim 1, wherein the volume resistivity of the second light source first wiring is lower than the volume resistivity of the second light source second wiring.

10. the support includes a plurality of reinforcing members having a higher hardness than the base material, 3 . The surface light source according to claim 1 , wherein at least a portion of the first light source first wiring and at least a portion of the second light source first wiring are positioned between the plurality of reinforcing members in the second direction.

11. The surface light source according to claim 10 , wherein the plurality of reinforcing members include a first reinforcing member that overlaps with the first light source in the second direction and a second reinforcing member that overlaps with the second light source in the second direction.

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