Planar light source, liquid crystal display device

Abstract

In a planar light source having multiple partition members, brightness unevenness is suppressed. [Solution] The planar light source is a planar light source having a plurality of light sources, a substrate, and a partitioning member, wherein the partitioning member is disposed on the substrate and has a first partition having a first bottom and a first inclined portion surrounding the first bottom, and a second partition having a second bottom and a second inclined portion surrounding the second bottom, the first member further has a first outer inclined portion that is connected to the upper end of the first inclined portion located on the outer edge of the second member and overlaps the second inclined portion located on the outer edge of the first member, the lower end of the first outer inclined portion is in contact with the upper surface of the second bottom, openings are provided in the first bottom and the second bottom, and the plurality of light sources are disposed on the substrate exposed through the openings.

Description

Technical Field

[0001] The present disclosure relates to a planar light source and a liquid crystal display device.

Background Art

[0002] There is known a planar light source having light sources arranged in a matrix direction on a substrate and a partition member including inclined portions surrounding each light source. In such a planar light source, when the outer shape of the planar light source becomes large, a plurality of partition members may be arranged on a single substrate. In such a case, as a measure against luminance unevenness, it has been proposed to arrange a cover member at a portion where the partition members are adjacent (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The present disclosure aims to suppress luminance unevenness in a planar light source in which a plurality of members having partition portions are arranged. Also, an object is to provide a liquid crystal display device using this planar light source.

Means for Solving the Problems

[0005] The planar light source is a planar light source having a plurality of light sources, a substrate, and a partitioning member, wherein the partitioning member is disposed on the substrate and has a first partition having a first bottom and a first inclined portion surrounding the first bottom, and a second partition having a second bottom and a second inclined portion surrounding the second bottom, the first member further has a first outer inclined portion that is connected to the upper end of the first inclined portion located on the outer edge of the second member and overlaps the second inclined portion located on the outer edge of the first member, the lower end of the first outer inclined portion is in contact with the upper surface of the second bottom, openings are provided in the first bottom and the second bottom, and the plurality of light sources are disposed on the substrate exposed through the openings. [Effects of the Invention]

[0006] According to one embodiment of this disclosure, brightness unevenness can be suppressed in a planar light source in which multiple members having partitioned sections are arranged. Furthermore, a liquid crystal display device using this planar light source can be provided. [Brief explanation of the drawing]

[0007] [Figure 1] This is a top view (part 1) illustrating partition member 1. [Figure 2] This is a top view (part 2) illustrating partition member 1. [Figure 3] This is a cross-sectional view taken along line III-III in Figure 1. [Figure 4] This is a cross-sectional view illustrating the width of the partitioned area, etc. [Figure 5] This is a top view illustrating the first member 10L. [Figure 6] This is a cross-sectional view illustrating partition member 1A. [Figure 7] This is a top view (part 1) illustrating partition member 1B. [Figure 8] This is a top view (part 2) illustrating partition member 1B. [Figure 9] Figure 7 shows a cross-sectional view along the IX-IX line. [Figure 10]This is a top view (part 1) illustrating partition member 1C. [Figure 11] This is a top view (part 2) illustrating partition member 1C. [Figure 12] Figure 10 shows a cross-sectional view along line XII-XII. [Figure 13] This is a top view (part 1) illustrating partition member 1D. [Figure 14] This is a top view (part 2) illustrating partition member 1D. [Figure 15] Figure 13 is a cross-sectional view along the XV-XV line. [Figure 16] This is a top view illustrating a planar light source according to the first embodiment. [Figure 17] This is a cross-sectional view along the line XVII-XVII in Figure 16. [Figure 18] This is a diagram illustrating a liquid crystal display device according to the second embodiment. [Modes for carrying out the invention]

[0008] The following description will explain embodiments for carrying out the invention with reference to the drawings. In the following description, terms indicating specific directions or positions (e.g., "up," "down," and other terms including these) will be used as needed. However, the use of these terms is solely to facilitate understanding the invention with reference to the drawings, and the meaning of these terms does not limit the technical scope of the present invention. Furthermore, parts with the same reference numerals appearing in multiple drawings indicate the same or equivalent parts or components.

[0009] Furthermore, the embodiments described below exemplify a planar light source or the like for embodying the technical idea of the present invention, and do not limit the present invention thereto. Also, the dimensions, materials, shapes, relative arrangements, etc. of the components described below are not intended to limit the scope of the present invention only thereto without specific description, but are intended to be exemplified. Also, the content described in one embodiment is applicable to other embodiments and modifications. Also, the sizes and positional relationships of the members shown in the drawings may be exaggerated for clarity of explanation. Furthermore, in order to avoid excessive complexity of the drawings, a schematic diagram omitting the illustration of some elements may be used, or an end view showing only the cut surface as a cross-sectional view may be used.

[0010] <First Embodiment> The planar light source of the first embodiment includes a plurality of light sources, a substrate, and a partitioning member. The plurality of light sources and the partitioning member are arranged on the substrate. The partitioning member functions as a reflector of the planar light source and is a member that serves as a partition for enhancing the contrast between the light emitting region and the non-light emitting region when performing local dimming by causing a part of the planar light source to emit light.

[0011] Hereinafter, each element constituting the planar light source will be described. Then, the details of the planar light source will be described.

[0012] (Partitioning Member 1) FIG. 1 is a top view (part 1) exemplifying the partitioning member 1. FIG. 1 shows a state in which the first member 10 and the second member 20 are overlapped. FIG. 2 is a top view (part 2) exemplifying the partitioning member 1. FIG. 2 shows a state in which the first member 10 and the second member 20 are not overlapped. FIG. 3 is a cross-sectional view taken along line III-III of FIG. 1. FIG. 3 shows both a state in which the first member 10 and the second member 20 are not overlapped and a state in which they are overlapped.

[0013] As shown in Figures 1 to 3, the partition member 1 has a first member 10 and a second member 20. In the example shown in Figures 1 to 3, the first member 10 and the second member 20 are arranged side by side in the X direction. The first member 10 is positioned overlapping a portion of the second member 20.

[0014] The first member 10 includes first compartments 11 arranged in a matrix of multiple rows and multiple columns. The number of first compartments 11 arranged in each row direction and each column direction may be the same or different. In the example shown in Figures 1 and 2, in a top view, multiple square first compartments 11 are arranged in 4 rows and 3 columns. In this specification, the row direction is defined as the X direction, the column direction as the Y direction, and the direction perpendicular to the X and Y directions as the Z direction.

[0015] Each first section 11 includes a first bottom 12, a first inclined section 13 surrounding the first bottom 12, and a light source placement opening 15 provided in the first bottom 12.

[0016] In the example shown in Figure 2, the first base 12 is square when viewed from above. The first inclined portions 13 are positioned on the outer edges of the X+, X-, Y+, and Y- sides of each first base 12. As shown in Figure 3, the distance between the regions sandwiched between the opposing first inclined portions 13 on either side of the first base 12 becomes narrower towards the lower end (first base side).

[0017] The light source placement opening 15 is an area in which a light source can be placed. The light source is placed on a substrate exposed from within the light source placement opening 15. The light source placement opening 15 is located in the center of the first bottom portion 12 and does not reach the lower end of the first inclined portion 13. The light source placement opening 15 is, for example, circular when viewed from above. The same applies to the light source placement openings 25 and 35, which will be described later.

[0018] In the example shown in Figure 3, in the adjacent first compartments 11, there is a space between the first inclined portion 13 on the X- side of the first compartment 11 located on the X+ side and the first inclined portion 13 on the X+ side of the first compartment 11 located on the X- side, and their upper ends are connected. The same applies to the second compartment 21 and the third compartment 31, which will be described later.

[0019] The first member 10 has a first outer inclined portion 14 that connects to the upper end of a first inclined portion 13 located on the outer edge of the second member 20. The first outer inclined portion 14 overlaps with a part of the second member 20. More specifically, the first outer inclined portion 14 overlaps with a second inclined portion 23, which is located on the outer edge of the second inclined portion on the first member 10 side, as will be described later.

[0020] The first outer inclined portion 14 may or may not be adhered to the second member 20. If the first outer inclined portion 14 is adhered to the second member 20, an adhesive member or the like can be used to bond the first outer inclined portion 14 to the second member 20. If the first outer inclined portion 14 is not adhered to the second member 20, the first outer inclined portion 14 may or may not be in contact with part or all of the portion that overlaps with the second member 20. The same applies to the cases where the third member and the second member overlap, and where the third member and the first member overlap, as described later.

[0021] In a top view, the first outer inclined portion 14 connects to the entire upper end of the first inclined portion 13, as shown in Figure 2. In the example in Figure 2, the top view shape of the first outer inclined portion 14 and the top view shape of the first inclined portion 13 are symmetrical with respect to the straight line at the upper end of the first inclined portion 13.

[0022] In a cross-sectional view, the lower end of the first outer inclined portion 14 may be separated from or in contact with the upper surface of the second bottom portion 22. As shown in Figure 3, when the partition member is used as a reflector for a planar light source, the light extraction efficiency can be increased by having the lower end of the first outer inclined portion 14 in contact with the upper surface of the second bottom portion 22. Also, when the lower end of the first outer inclined portion 14 is in contact with the upper surface of the second bottom portion 22, the area in contact between the first outer inclined portion 14 and the second member 20 increases. As a result, when the first outer inclined portion 14 is bonded to the second member 20 using an adhesive, the first member 10 becomes less likely to peel off from the second member 20. As shown in Figure 3, it is preferable that the angle α between the first outer inclined portion 14 and the first inclined portion 13 is the same as the angle β between the two first inclined portions 13 that are connected at their upper ends. This makes it possible to suppress brightness unevenness within the first partition portion 11.

[0023] In the example shown in Figure 3, the thickness of the first outer inclined portion 14 is the same as the thickness of the first inclined portion 13. However, the thickness of the first outer inclined portion 14 can be thinner than the thickness of the first inclined portion 13. Here, thickness refers to the length in the direction perpendicular to the upper surface of the first outer inclined portion 14 or the upper surface of the first inclined portion 13.

[0024] The first outer inclined portions 14 are arranged in a manner corresponding to the number of first inclined portions 13 located on the outer edge of the second member 20. In the example shown in Figure 2, since there are four first inclined portions 13 on the outer edge of the second member 20, four first outer inclined portions 14 are arranged.

[0025] The second member 20 includes second compartments 21 arranged in a matrix of multiple rows and multiple columns. The number of second compartments 21 arranged in each row direction and each column direction may be the same or different. In the example in Figures 1 and 2, in a top view, multiple square second compartments 21 are arranged in 4 rows and 3 columns. The number of first compartments 11 and second compartments 21 may be the same or different.

[0026] Each second section 21 includes a second bottom 22, a second inclined section 23 surrounding the second bottom 22, and a light source placement opening 25 provided in the second bottom 22.

[0027] In the example in Figure 2, the second base 22 is square in top view. Second inclined portions 23 are positioned on the outer edges of each second base 22 on the X+, X-, Y+, and Y- sides. As shown in the example in Figure 3, the distance between the regions sandwiched between the opposing second inclined portions 23 on either side of the second base 22 becomes narrower towards the lower end (second base 22 side).

[0028] Figure 4 is a cross-sectional view illustrating the width of the partitioned section, etc. In the example shown in Figure 4, the partitioning member 1 is placed on the substrate.

[0029] Let L1 be the distance in the X direction between the upper ends of the first inclined portions 13 facing each other via the first bottom portion 12. Let L2 be the distance in the X direction between the upper end of the first outer inclined portion 14 and the upper end of the second inclined portion 23 facing the second inclined portion 23 that overlaps with the first outer inclined portion 14 (i.e., the second inclined portion 23 on the X+ side of the second partition portion 21 located on the outer edge on the first member 10 side). It is preferable that L1 and L2 are the same.

[0030] When the lower end of the first outer inclined portion 14 is in contact with the upper surface of the second bottom portion 22, it is preferable that the width L3 from the lower end of the first outer inclined portion 14 to the lower end of the second inclined portion 23 facing the second inclined portion 23 located on the outer edge on the first member 10 side is the same as the width L4 of the first bottom portion 12.

[0031] When the lower end of the first outer inclined portion 14 is in contact with the upper surface of the second bottom portion 22, it is preferable that the width L3 from the lower end of the first outer inclined portion 14 to the lower end of the second inclined portion 23 facing the second inclined portion 23 that overlaps with the first outer inclined portion 14 is the same as the width L6 of the second bottom portion 22 of the second compartment 21 adjacent to the second compartment 21 that overlaps with the first outer inclined portion 14.

[0032] When the lower end of the first outer inclined portion 14 is in contact with the upper surface of the second bottom portion 22, it is preferable that the width L3 from the lower end of the first outer inclined portion 14 to the lower end of the second inclined portion 23 that is opposite to the second inclined portion 23 that overlaps with the first outer inclined portion 14 is narrower than the width L5 of the second bottom portion 22 located on the outer edge of the first member 10 side.

[0033] In this specification, "width" refers to the distance in the X direction.

[0034] It is preferable that the height H1 of the upper end of the second inclined portion 23 located on the outer edge of the first member 10 is lower than the height H2 of the upper end of the first outer inclined portion 14.

[0035] It is preferable that the height H3 of the upper end of the first inclined portion 13 is the same as the height H4 of the upper end of the second inclined portion 23. Furthermore, it is preferable that the height H2 of the upper end of the first outer inclined portion 14 is the same as the height H3 of the upper end of the first inclined portion 13 and the height H4 of the upper end of the second inclined portion 23.

[0036] In this specification, "height" refers to the distance from the top surface of the substrate 51 in the Z direction.

[0037] By setting the relationship between the heights H1 to H4 and the widths L1 to L6 as described above, luminance unevenness can be suppressed when the partition member 1 is used as a reflector for a planar light source.

[0038] When partition member 1 is used as a reflector for a planar light source, a part of the first member 10 and a part of the second member 20 overlap, which suppresses the occurrence of a gap between the first member 10 and the second member 20 in a planar view, thus suppressing brightness unevenness.

[0039] Details regarding the appropriate dimensions and materials for the partition members will be described later.

[0040] Figure 5 is a top view illustrating a modified example of the first member 10, which is the first member 10L. In addition to the configuration of the first member 10 described above, the first member 10L has a first connecting inclined portion 16. The first connecting inclined portion 16 is connected to each of the first adjacent first outer inclined portions 14. The first connecting inclined portion 16 overlaps the second inclined portion 23 located below the first outer inclined portion 14 and the adjacent second inclined portion 23. By connecting the adjacent first outer inclined portions 14 at the first connecting inclined portion 16, the strength of the first outer inclined portion 14 is increased, and deformation of the first outer inclined portion 14 can be suppressed. As a result, when the first member 10 and the second member 20 contract due to heat such as light source driving, even if the first member 10 and the second member 20 try to contract away from each other, the contraction of the first member 10 and the second member 20 can be suppressed by the first outer inclined portion 14. Furthermore, "the second inclined portion 23 located below the first outer inclined portion 14 and the second inclined portion 23 adjacent to it" refers to the second inclined portion 23 on the Y+ side or Y- side of the second partitioned portion 21 located on the outer edge of the first member 10 side.

[0041] In the example shown in Figure 5, the first connecting inclined portion 16 connected to each of the adjacent first outer inclined portions 14 consists of a first connecting inclined portion 16a and a first connecting inclined portion 16b. The first connecting inclined portion 16a connects to the first outer inclined portion 14 on the Y+ side of the adjacent first outer inclined portion 14. The first connecting inclined portion 16a is inclined with respect to the first bottom portion 12 and overlaps the second inclined portion 23 located below the first connecting inclined portion 16a. The first connecting inclined portion 16b connects to the first outer inclined portion 14 on the Y- side of the adjacent first outer inclined portion 14. The first connecting inclined portion 16b is inclined with respect to the first bottom portion 12 and overlaps the second inclined portion 23 located below the first connecting inclined portion 16b.

[0042] In the example shown in Figure 5, the maximum length of the first connecting inclined portion 16 in the X direction is the same as the maximum length of the first outer inclined portion 14. However, the maximum length of the first connecting inclined portion 16 in the X direction can be longer than the maximum length of the first outer inclined portion 14 and shorter than the length of the second partitioned portion 21.

[0043] The height of the upper end of the first connecting inclined portion 16 is preferably the same as the height of the upper end of the first outer inclined portion 14. The height of the upper end of the second inclined portion 23, which is located below the first outer inclined portion 14, may be the same as the height of the upper end of the first outer inclined portion 14, or it may be lower.

[0044] Furthermore, if the second member and / or third member described later have an outward inclined portion, the second member and / or third member may also have a connecting inclined portion.

[0045] Figure 6 is a cross-sectional view illustrating a modified part of parting member 1, namely parting member 1A. Parting member 1A comprises a first member 10A and a second member 20A. In addition to the configuration of the first member 10 described above, the first member 10A has a first protrusion 17 on a first outer inclined portion 14. The first protrusion 17 projects to the X- side from the surface of the first outer inclined portion 14 facing the second inclined portion 23 that overlaps with the first outer inclined portion 14. In addition to the configuration of the second member 20 described above, the second member 20A has a second protrusion 27 on a second inclined portion 23 located on the outer edge of the first member 10 side. The second protrusion 27 projects to the X+ side from the surface of the second inclined portion 23 facing the first outer inclined portion 14. The first protrusion 17 is sandwiched between the second protrusion 27 and the second bottom portion 22. This prevents the first member 10 and the second member 20 from separating from each other when the partition member 1 is contracted.

[0046] Figure 7 is a plan view (part 1) illustrating partition member 1B, a modified example of partition member 1. Figure 7 shows the state in which the first member 10B, the second member 20B, and the third member 30B are superimposed. Figure 8 is a plan view (part 2) illustrating partition member 1B. Figure 8 shows the state in which the first member 10B, the second member 20B, and the third member 30B are not superimposed. Figure 9 is a cross-sectional view taken along the line IX-IX in Figure 7. Figure 9 shows both the state in which the first member 10B, the second member 20B, and the third member 30B are not superimposed and the state in which they are superimposed.

[0047] As shown in Figures 7 to 9, the partition member 1B has a first member 10B, a second member 20B, and a third member 30B. In the example in Figures 7 to 9, the first member 10B, the second member 20B, and the third member 30B are arranged in that order toward the X+ side. The first member 10B is positioned overlapping a portion of the second member 20B, and the second member 20B is positioned overlapping a portion of the third member 30B.

[0048] In the partition member 1B, the first member 10B is the same as the first member 10 described above. The second member 20B has a second outer inclined portion 24 in addition to the configuration of the second member 20 described above. The second outer inclined portion 24 is connected to the upper end of the second inclined portion 23 located on the outer edge of the third member 30B side, which will be described later, and overlaps with the third inclined portion 33 located on the outer edge of the second member 20 side.

[0049] In a top view, the second outer inclined portion 24 is connected to the entire upper end of the second inclined portion 23, as shown in Figure 8.

[0050] In a cross-sectional view, the second outer inclined portion 24 may overlap with a part of the second inclined portion 23 located on the outer edge of the third member 30B, or it may overlap with all of it. In a cross-sectional view, it is preferable that the lower end of the second outer inclined portion 24 is in contact with the upper surface of the third bottom portion 32.

[0051] In a cross-sectional view, it is preferable that the angle between the second outer inclined portion 24 and the second inclined portion 23 is the same as the angle between the two second inclined portions 23 that are connected at their upper ends.

[0052] The top view shape, thickness, and number of the second outer inclined portion 24 are the same as those of the first outer inclined portion 14.

[0053] The third member 30B includes third compartments 31 arranged in a matrix of multiple rows and multiple columns. The number of third compartments 31 arranged in each row and column direction may be the same or different. In the examples of Figures 7 and 8, in a top view, multiple square third compartments 31 are arranged in 4 rows and 3 columns. The number of first compartments 11, second compartments 21, and third compartments 31 may be the same or different. The same applies to the third members 30C and 30D described later.

[0054] The third section 31 includes a third bottom 32, a third inclined section 33 surrounding the third bottom 32, and a light source placement opening 35 provided in the third bottom 32. The same applies to the third members 30C and 30D, which will be described later.

[0055] In the example shown in Figure 8, the third base 32 is, for example, square in a top view. Third inclined portions 33 are positioned on the outer edges of the X+, X-, Y+, and Y- sides of each third base 32. As shown in the example shown in Figure 9, the distance between the regions sandwiched by opposing third inclined portions 33 becomes narrower towards the lower end (third base 32 side).

[0056] Preferably, the distance in the X direction between the upper ends of the second inclined portions 23 facing each other via the second bottom portion 22 is the same as the distance in the X direction between the upper end of the second outer inclined portion 24 and the upper end of the third inclined portion 33 facing the third inclined portion 33 that overlaps with the second outer inclined portion 24. Note that "the third inclined portion 33 facing the third inclined portion 33 that overlaps with the second outer inclined portion 24" refers to "the third inclined portion 33 on the X+ side of the third compartment portion 31 located on the outer edge of the second member 20 side."

[0057] When the lower end of the second outer inclined portion 24 is in contact with the upper surface of the third bottom portion 32, it is preferable that the width from the lower end of the second outer inclined portion 24 to the lower end of the third inclined portion 33 that is opposite to the third inclined portion 33 that overlaps with the second outer inclined portion 24 is the same as the width of the second bottom portion 22.

[0058] When the lower end of the second outer inclined portion 24 is in contact with the upper surface of the third bottom portion 32, it is preferable that the width from the lower end of the second outer inclined portion 24 to the lower end of the third inclined portion 33 facing the third inclined portion 33 that overlaps with the second outer inclined portion 24 is the same as the width of the third bottom portion 32 of the third compartment 31 adjacent to the third compartment 31 that overlaps with the second outer inclined portion 24.

[0059] When the lower end of the second outer inclined portion 24 is in contact with the upper surface of the third bottom portion 32, it is preferable that the width from the lower end of the second outer inclined portion 24 to the lower end of the third inclined portion 33 that is opposite to the third inclined portion 33 that overlaps with the second outer inclined portion 24 is narrower than the width of the third bottom portion 32 located on the outer edge of the second member 20B.

[0060] It is preferable that the height of the upper end of the third inclined portion 33, located on the outer edge of the second member 20B, is lower than the height of the upper end of the second outer inclined portion 24.

[0061] Preferably, the height of the upper end of the second inclined portion 23 is the same as the height of the upper end of the third inclined portion 33.

[0062] By setting the width and height relationship as described above, luminance unevenness can be suppressed when partition member 1B is used as a reflector for a planar light source.

[0063] Figure 10 is a plan view (part 1) illustrating partition member 1C, which is a modified example of partition member 1. Figure 10 shows the state in which the first member 10C, the second member 20C, and the third member 30C are superimposed. Figure 11 is a plan view (part 2) illustrating partition member 1C. Figure 11 shows the state in which the first member 10C, the second member 20C, and the third member 30C are not superimposed. Figure 12 is a cross-sectional view taken along the line XII-XII in Figure 10. Figure 12 shows both the state in which the first member 10C, the second member 20C, and the third member 30C are not superimposed and the state in which they are superimposed.

[0064] As shown in Figures 10 to 12, the partition member 1C has a first member 10C, a second member 20C, and a third member 30C. In the example in Figures 10 to 12, the first member 10C, the second member 20C, and the third member 30C are arranged in that order toward the X+ side. The first member 10C is positioned overlapping a portion of the second member 20C, and the third member 30C is positioned overlapping a portion of the second member 20C.

[0065] In partition member 1C, the first member 10C and the second member 20C are the same as the first member 10 and the second member 20 described above. The third member 30C has a third outer inclined portion 34 in addition to the configuration of the third member 30B described above. The third outer inclined portion 34 is connected to the upper end of the third inclined portion 33 located on the outer edge of the second member 20C side and overlaps the second inclined portion 23 located on the outer edge of the third member 30C side.

[0066] In a top view, the third outer inclined portion 34 connects to the entire upper end of the third inclined portion 33 in the example shown in Figure 11.

[0067] In a cross-sectional view, the third outer inclined portion 34 may overlap with a part of the third inclined portion 33 located on the outer edge of the second member 20C, or it may overlap with all of it. In a cross-sectional view, it is preferable that the lower end of the third outer inclined portion 34 is in contact with the upper surface of the second bottom portion 22.

[0068] In a cross-sectional view, it is preferable that the angle between the third outer inclined portion 34 and the third inclined portion 33 is the same as the angle between the two third inclined portions 33 that are connected at their upper ends.

[0069] The top view shape, thickness, and number of the third outer inclined portion 34 are the same as those of the first outer inclined portion 14.

[0070] The distance in the X direction between the upper ends of the third inclined portions 33 facing each other via the third bottom portion 32 is preferably the same as the distance in the X direction between the upper end of the third outer inclined portion 34 and the upper end of the second inclined portion 23 facing the second inclined portion 23 that overlaps with the third outer inclined portion 34. Note that "the second inclined portion 23 facing the second inclined portion 23 that overlaps with the third outer inclined portion 34" refers to the second inclined portion 23 on the X-side of the second compartment portion 21 located on the outer edge of the third member 30.

[0071] When the lower end of the third outer inclined portion 34 is in contact with the upper surface of the second bottom portion 22, it is preferable that the width from the lower end of the third outer inclined portion 34 to the lower end of the second inclined portion 23 facing the second inclined portion 23 located on the outer edge on the third member 30C side is the same as the width of the third bottom portion 32.

[0072] When the lower end of the third outer inclined portion 34 is in contact with the upper surface of the second bottom portion 22, it is preferable that the width from the lower end of the third outer inclined portion 34 to the lower end of the second inclined portion 23 facing the second inclined portion 23 located on the outer edge on the third member 30C side is the same as the width of the second bottom portion 22 of the second compartment portion 21 adjacent to the second compartment portion 21 that overlaps with the third outer inclined portion 34.

[0073] When the lower end of the third outer inclined portion 34 is in contact with the upper surface of the second bottom portion 22, it is preferable that the width from the lower end of the third outer inclined portion 34 to the lower end of the second inclined portion 23 facing the second inclined portion 23 located on the outer edge of the third member 30C is narrower than the width of the second bottom portion 22 located on the outer edge of the third member 30C.

[0074] It is preferable that the height of the upper end of the second inclined portion 23, located on the outer edge of the third member 30C, is lower than the height of the upper end of the third outer inclined portion 34.

[0075] Preferably, the height of the upper end of the second inclined portion 23 is the same as the height of the upper end of the third inclined portion 33.

[0076] By setting the width and height relationship as described above, luminance unevenness can be suppressed when partition member 1C is used as a reflector for a planar light source.

[0077] Figure 13 is a plan view (part 1) illustrating partition member 1D, which is a modified example of partition member 1. Figure 13 shows the state in which the first member 10D, the second member 20D, and the third member 30D are superimposed. Figure 14 is a plan view (part 2) illustrating partition member 1D. Figure 14 shows the state in which the first member 10D, the second member 20D, and the third member 30D are not superimposed. Figure 15 is a cross-sectional view taken along the line XV-XV in Figure 13. Figure 15 shows both the state in which the first member 10D, the second member 20D, and the third member 30D are not superimposed and the state in which they are superimposed.

[0078] As shown in Figures 13 to 15, the partition member 1D has a first member 10D, a second member 20D, and a third member 30D. In the example in Figures 10 to 12, the third member 30D, the first member 10D, and the second member 20D are arranged in that order toward the X+ side. The first member 10D is positioned overlapping a portion of the second member 20D and a portion of the third member 30D.

[0079] In the partition member 1D, the first member 10D has, in addition to the configuration of the first member 10 described above, a first outer inclined portion located on the outer edge on the side of the third member 30D. The first member 10D of the partition member 1D has a first outer inclined portion 141 located on the outer edge on the X+ side (i.e., the side of the second member 20D) of the first member 10D, and a first outer inclined portion 142 located on the outer edge on the X- side (i.e., the side of the third member 30D) of the first member 10D.

[0080] As described in section 1, the first outer inclined portion 141 connects to the upper end of the first inclined portion 13 located on the outer edge of the second member 20D and overlaps with the second inclined portion 23 located on the outer edge of the first member 10D. The first outer inclined portion 142 connects to the upper end of the first inclined portion 13 located on the outer edge of the third member 30D and overlaps with the third inclined portion 33 located on the outer edge of the first member 10D.

[0081] The second member 20D is the same as the second member 20 described above. The third member 30D is the same as the third member 30B described above.

[0082] In a top view, the first outer inclined portion 142 is connected to the entire upper end of the first inclined portion 13, as shown in Figure 14.

[0083] In a cross-sectional view, the first outer inclined portion 142 may overlap with a part of the third inclined portion 33 located on the outer edge of the first member 10D, or it may overlap with all of it. In a cross-sectional view, it is preferable that the lower end of the first outer inclined portion 142 is in contact with the upper surface of the third bottom portion 32.

[0084] In a cross-sectional view, it is preferable that the angle between the first outer inclined portion 142 and the first inclined portion 13 is the same as the angle between the two first inclined portions 13 that are connected at their upper ends.

[0085] The top view shape, thickness, and number of the first outer inclined portion 142 are the same as those of the first outer inclined portion 14.

[0086] The first outer inclined portion 141 is the same as the first outer inclined portion 14.

[0087] Preferably, the distance in the X direction between the upper ends of the first inclined portions 13 facing each other via the first bottom portion 12 is the same as the distance in the X direction between the upper end of the first outer inclined portion 142 and the upper end of the third inclined portion 33 facing the third inclined portion 33 that overlaps with the first outer inclined portion 142. Note that "the third inclined portion 33 facing the third inclined portion 33 that overlaps with the first outer inclined portion 142" refers to the third inclined portion 33 on the X-side of the third compartment portion 31 located on the outer edge of the first member 10 side.

[0088] When the lower end of the first outer inclined portion 142 is in contact with the upper surface of the third bottom portion 32, it is preferable that the width from the lower end of the first outer inclined portion 142 to the lower end of the third inclined portion 33 that is opposite to the third inclined portion 33 that overlaps with the first outer inclined portion 142 is the same as the width of the first bottom portion 12.

[0089] When the lower end of the first outer inclined portion 142 is in contact with the upper surface of the third bottom portion 32, it is preferable that the width from the lower end of the first outer inclined portion 142 to the lower end of the third inclined portion 33 facing the third inclined portion 33 that overlaps with the first outer inclined portion 142 is the same as the width of the third bottom portion 32 of the third compartment 31 adjacent to the third compartment 31 that overlaps with the first outer inclined portion 142.

[0090] When the lower end of the first outer inclined portion 142 is in contact with the upper surface of the third bottom portion 32, it is preferable that the width from the lower end of the first outer inclined portion 142 to the lower end of the third inclined portion 33 that is opposite to the third inclined portion 33 that overlaps with the first outer inclined portion 142 is narrower than the width of the third bottom portion 32 located on the outer edge of the first member 10D.

[0091] It is preferable that the height of the upper end of the third inclined portion 33, located on the outer edge of the first member 10D, is lower than the height of the upper end of the first outer inclined portion 142.

[0092] Preferably, the height of the upper end of the third inclined portion 33 is the same as the height of the upper end of the first inclined portion 13.

[0093] By setting the width and height relationship as described above, luminance unevenness can be suppressed when the partition member 1D is used as a reflector for a planar light source.

[0094] (Surface light source) A planar light source can be constructed by arranging the light source and the above-mentioned partition members on a substrate. Here, a planar light source will be described using partition member 1 as an example. However, partition members 1A to 1D described above may be used instead of partition member 1.

[0095] Figure 16 is a top view illustrating a planar light source according to the first embodiment. Figure 17 is a cross-sectional view taken along the line XVII-XVII in Figure 16. As shown in Figures 16 and 17, the planar light source 60 is a surface-emitting type light-emitting device having a substrate 51, a covering member 55, a partitioning member 1, and a plurality of light sources 62. In the example shown in Figure 17, the covering member 55 covers at least a portion of the upper surface of the substrate 51, and the partitioning member 1 is arranged on the substrate 51 via the covering member 55. The covering member 55 is provided as needed.

[0096] In the partition member 1, the area surrounded by the first inclined portion 13, the area surrounded by the first outer inclined portion 14 and the second inclined portion 23, and the area surrounded by the second inclined portion 23 are defined as partition C. The upper end of each inclined portion is defined as 1u. In a top view, the boundary between adjacent partitions C can be considered as the upper end 1u. It is preferable that the partition member 1 is a reflective material.

[0097] In the planar light source 60, the lower surfaces of the first bottom 12 and the second bottom 22 of the partition member 1 can be joined to a covering member 55 placed on the substrate 51. In the example of Figure 17, the lower surfaces of the first bottom 12 and the second bottom 22 of the partition member 1 are indirectly joined to the substrate 51 via the covering member 55.

[0098] Furthermore, in the planar light source 60, the light source 62 is positioned on a substrate 51 that is exposed from within the light source placement opening 15 of the first bottom 12 and within the light source placement opening 25 of the second bottom 22. The planar light source 60 will be described in detail below.

[0099] (Circuit board 51) The substrate 51 is a component for mounting multiple light sources 62. Conductor wiring 58A and 58B for supplying power to the light sources 62 are arranged on the upper surface 51m of the substrate 51. Preferably, a covering member 55 is used to cover a portion of the conductor wiring 58A and 58B that is not electrically connected to the light-emitting elements.

[0100] The substrate 51 can be made of any material that can insulate and separate at least one pair of conductive wirings 58A and 58B, such as ceramics, resins, or composite materials. Examples of resins include phenolic resin, epoxy resin, polyimide resin, BT resin, polyphthalamide (PPA), and polyethylene terephthalate (PET). Examples of composite materials include those made by mixing the above-mentioned resins with inorganic fillers such as glass fibers, SiO2, TiO2, and Al2O3, glass fiber reinforced resin (glass epoxy resin), and metal substrates coated with an insulating layer on a metal component.

[0101] The thickness of the substrate 51 can be selected as appropriate. The substrate 51 may be either a flexible substrate or a rigid substrate that can be manufactured using a roll-to-roll method. The rigid substrate may be a thin, bendable rigid substrate. The conductive wiring 58A and 58B are not limited in material as long as they are conductive members, and materials commonly used as wiring layers for circuit boards and the like can be used. A light-reflective film or the like may be placed on the surface of the conductive wiring 58A and 58B.

[0102] The covering member 55 is preferably made of an insulating material. Examples of materials for the covering member 55 include those exemplified for the substrate 51. By using a covering member 55 that contains a white filler or the like in the aforementioned resin, the light emitted from the light source 62 is reflected, improving the light extraction efficiency of the planar light source 60.

[0103] (Light source 62) The light source 62 is a component that emits light, and in the example shown in Figure 17, it is a light-emitting element sealed in a light-transmitting resin. The shape of the light-transmitting resin is, for example, approximately hemisphere. The material of the light-transmitting back resin is, for example, silicone resin. The light-transmitting resin may or may not contain a phosphor and / or a diffusing material. The light source 62 is not limited to this, and may be a light-emitting element itself that emits light, or it may be a component in which a light-emitting element is housed in a recess of a resin molded body and the light-emitting element is sealed in a light-transmitting member. Alternatively, it may be a configuration that includes a resin containing a light-reflective material surrounding the sides of the light-emitting element, and a light-transmitting member covering the top surface of the light-emitting element and the top surface of the resin containing the light-reflective material. It may also be a configuration that includes a light-transmitting member covering the top surface of the light-emitting element, and a resin containing a light-reflective material surrounding the sides of the light-emitting element and the sides of the light-transmitting member. This light-transmitting member may contain a phosphor. A light-transmitting adhesive member may be provided between the light-emitting element and the light-transmitting member to bond the light-emitting element and the light-transmitting member together.

[0104] The light source 62 preferably has a wide beam pattern in order to illuminate each section C surrounded by each inclined portion of the partition member 1D with minimal brightness unevenness. In particular, it is preferable that each of the light sources 62 has a batwing beam pattern. This suppresses the amount of light emitted directly above the light source 62, widens the beam pattern of each light source 62, and illuminates each inclined portion and each bottom with the widened light, thereby suppressing brightness unevenness in each section C surrounded by each inclined portion.

[0105] Here, the batwing light distribution characteristic is defined as having a light emission intensity distribution where the light emission intensity is stronger than at 0 degrees when the absolute value of the light distribution angle is greater than 0 degrees, with the optical axis OA being 0 degrees. The optical axis OA is defined as a line that passes through the center of the light source 62 and intersects perpendicularly with the upper surface 51m of the substrate 51, as shown in Figure 17.

[0106] In particular, as a light source 62 having batwing light distribution characteristics, for example, as shown in Figure 17, a light-emitting element 62a having a light-reflective film 62c on its upper surface can be used. By providing a light-reflective film 62c on the upper surface of the light-emitting element 62a, most of the light directed upward from the light-emitting element 62a is reflected by the light-reflective film 62c, suppressing the amount of light directly above the light-emitting element 62a, and thus obtaining batwing light distribution characteristics. Lenses may also be added separately to achieve batwing light distribution.

[0107] The light-reflecting film 62c may be a metal film such as silver or copper, a resin containing a white filler, or a combination thereof. Furthermore, the light-reflecting film 62c may be a dielectric multilayer film (DBR film) and may have an angle dependence of reflectivity with respect to the incident angle with respect to the emission wavelength of the light-emitting element 62a. Specifically, it is preferable to set the reflectivity of the light-reflecting film 62c to be lower for oblique incidence than for perpendicular incidence. This makes the change in brightness directly above the light-emitting element 62a more gradual, suppressing extreme darkness such as a dark spot directly above the light-emitting element 62a. The light-reflecting layer may also be placed above the translucent member described above.

[0108] The thickness of the light-emitting element 62a can range from 100 μm to 500 μm. The thickness of the light-reflecting film 62c can range from 0.1 μm to 3.0 μm. The thickness of the light source with the sealing member can be approximately 0.5 mm to 2.0 mm.

[0109] It is preferable that the multiple light sources 62 are driven independently of each other and are wired on the substrate 51 so that dimming control (e.g., local dimming or high dynamic range) is possible for each light source 62.

[0110] (Light-emitting element 62a) The light-emitting element 62a includes a semiconductor structure. The semiconductor structure includes an n-side semiconductor layer, a p-side semiconductor layer, and an active layer sandwiched between the n-side and p-side semiconductor layers. The active layer may be a single quantum well (SQW) structure or a multiple quantum well (MQW) structure including multiple well layers. The semiconductor structure includes multiple semiconductor layers made of nitride semiconductors. The nitride semiconductor is In x Al y Ga 1-x-y The semiconductor comprises all compositions in which the composition ratios x and y are varied within their respective ranges in the chemical formula N (0 ≤ x, 0 ≤ y, x + y ≤ 1). The emission peak wavelength of the active layer can be appropriately selected depending on the purpose. The active layer is configured to emit, for example, visible light or ultraviolet light.

[0111] A semiconductor structure may include multiple light-emitting sections, each containing an n-side semiconductor layer, an active layer, and a p-side semiconductor layer. When a semiconductor structure includes multiple light-emitting sections, each light-emitting section may include well layers with different emission peak wavelengths, or well layers with the same emission peak wavelength. Note that "same emission peak wavelength" includes variations of a few nanometers. The combination of emission peak wavelengths of the multiple light-emitting sections can be selected as appropriate. For example, when a semiconductor structure includes two light-emitting sections, possible combinations of light emitted by each section include 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. For example, when a semiconductor structure includes three light-emitting sections, possible combinations of light emitted by each section include blue light, green light, and red light. Each light-emitting section may include one or more well layers with emission peak wavelengths different from the other well layers.

[0112] The joining member 59 is a member for joining the light source 62 to the conductive wiring, and examples include conductive members. Specifically, examples include Au-containing alloys, Ag-containing alloys, Pd-containing alloys, In-containing alloys, Pb-Pd-containing alloys, Au-Ga-containing alloys, Au-Sn-containing alloys, Sn-containing alloys, Sn-Cu-containing alloys, Sn-Cu-Ag-containing alloys, Au-Ge-containing alloys, Au-Si-containing alloys, Al-containing alloys, Cu-In-containing alloys, and mixtures of metal and flux.

[0113] (Partition member 1) The partition member 1 is placed on the substrate 51. The partition member 1 may be placed on the upper surface of the substrate 51, or it may be placed between a covering member 55 or the like which is placed on the upper surface of the substrate 51.

[0114] In the partition member 1, each light source placement opening (light source placement openings 15 and 25) is located in the center of partition C when viewed from above. The shape and size of each light source placement opening should be such that the entire light source 62 is exposed, and it is preferable that the outer edge of each light source placement opening is located near the light source 62. This makes it possible to reflect light from the light source 62 at each bottom (first bottom 1b, second bottom 2b, third bottom 3b, and fifth bottom 5b) when the partition member 1 is light reflecting, thereby improving the efficiency of light extraction.

[0115] The angle between the two inclined sections connected at their upper ends (α and β in Figure 17) is preferably, for example, 60 to 90 degrees. By setting it within this range, brightness unevenness between sections can be suppressed.

[0116] The pitch between the upper ends 1u of each inclined portion of the partition member 1 can be appropriately adjusted depending on the size of the light source used, the intended size of the planar light source, etc. Examples of pitches include 1 mm to 50 mm, preferably 5 mm to 20 mm, and more preferably 6 mm to 15 mm.

[0117] Furthermore, the height H of the partition member 1 itself, that is, the length from the bottom surface of each bottom of the partition member 1 to the upper end 1u, is preferably 8 mm or less, and if a thinner planar light source is to be used, it is preferably about 1 mm to 4 mm.

[0118] The upper surfaces of the first bottom 12 and the second bottom 22 of the partition member 1 may be flat or rough. Furthermore, multiple protrusions projecting upward from the upper surface of each bottom may be arranged. These protrusions are light-reflective. As a result, light from a light source is reflected upward by the protrusions, thereby suppressing uneven brightness within the partition.

[0119] If the base is square, the multiple protrusions are positioned, for example, at each of the four corners. The number of multiple protrusions positioned at each of the four bases may be one or more.

[0120] Preferably, the upper end of each projection is lower than the upper end of each inclined portion and higher than the upper surface of the light-emitting element.

[0121] The shape of each projection is, for example, cone-shaped.

[0122] The material of the protrusion may be the same as or different from the material of the partition member.

[0123] It is preferable to join the partition member 1 to the substrate using an adhesive member. This helps to suppress misalignment of the partition member 1. The partition member 1 can be joined around each light source placement opening using a light-reflective adhesive member so that light emitted from the light source does not enter between the substrate 51 and the partition member 1. For example, it is more preferable to arrange the light-reflective adhesive member in a ring shape along the outer edge of each light source placement opening. The adhesive member may be, for example, a double-sided tape with an acrylic resin adhesive on both sides of a PET substrate, a hot-melt type adhesive sheet, or a resin-based adhesive such as a thermosetting resin or thermoplastic resin. It is preferable that these adhesive members have high flame retardancy. Furthermore, the partition member 1 may be joined to the substrate using screws or fixing pins.

[0124] The partition member 1 may be made of a resin containing a reflective material made of particles such as titanium oxide, aluminum oxide, or silicon oxide, or a resin that does not contain a reflective material may have a reflective material provided on its surface. Alternatively, a resin containing multiple fine bubbles may be used. Examples of resins used for the partition member 1D include thermoplastic resins such as acrylic resin, polycarbonate resin, cyclic polyolefin resin, polyethylene terephthalate (PET), or polyester, or thermosetting resins such as epoxy resin or silicone resin. It is preferable that the partition member 1 is set to have a reflectance of 70% or more to light emitted from the light source 62.

[0125] The partition member 1 may be formed by creating the first member 10 and the second member 20 using a mold molding method, a stereolithography molding method, or by purchasing them. Examples of mold molding methods include injection molding, extrusion molding, compression molding, vacuum molding, and press molding. For example, by vacuum molding using a reflective sheet made of PET or the like, the first member 10 and the second member 20, with their respective bottoms and inclined portions integrally molded, can be obtained. The first outer inclined portion 14 of the first member can be obtained by integrally molding the first bottom 12 and the first inclined portion 13. When molding the inclined portion, the aforementioned protrusions can be molded simultaneously with the inclined portion.

[0126] The planar light source 60 may have an optical member positioned above the light source 62, with the partition member 1 in between. The optical member is, for example, a diffusion sheet. By having a diffusion sheet in the planar light source 60, the uniformity of the light transmitted through the diffusion sheet can be improved. Furthermore, the planar light source 60 may further include at least one selected from the group consisting of a wavelength conversion sheet, a prism sheet, a polarizing sheet, a brightness enhancement sheet, and a color filter, above the diffusion sheet. By having one or more of these optical members in the planar light source 60, the uniformity of the light transmitted through the diffusion sheet can be further improved. The prism sheet has a shape in which a plurality of prisms extending in a predetermined direction are arranged on its surface. For example, the prism sheet is made by stacking sheets that have a plurality of prisms extending in the Y direction and a plurality of prisms extending in the X direction, when the plane of the sheet is viewed in two dimensions, the X direction and the Y direction perpendicular to the X direction.

[0127] The first embodiment was described in the case where the top view shape of the partition is rectangular. However, it is not limited to this, and for example, the top view shape of the partition may be hexagonal.

[0128] <Second Embodiment> The second embodiment shows an example of a liquid crystal display device (liquid crystal display device) that uses a planar light source as a backlight light source.

[0129] Figure 18 is a diagram illustrating a liquid crystal display device according to the second embodiment. As shown in Figure 18, the liquid crystal display device 1000 comprises, from top to bottom, a liquid crystal panel 720, an optical sheet 710, and a planar light source 60.

[0130] The liquid crystal display device 1000 is a so-called direct-lit liquid crystal display device in which a planar light source 60 is stacked below the liquid crystal panel 720. The liquid crystal display device 1000 illuminates the liquid crystal panel 720 with light emitted from the planar light source 60.

[0131] From the perspective of miniaturizing the planar light source, the thickness of the planar light source can be reduced to 15 mm or less. This makes the planar light source thinner, and thus the liquid crystal display device 1000 can be made thinner.

[0132] The planar light source 60 is not limited to being used as a backlight for a liquid crystal display device 1000. The planar light source 60 can also be used as a backlight for televisions, tablets, smartphones, smartwatches, head-up displays, digital signage, bulletin boards, etc. Furthermore, the planar light source 60 can be used as a light source for illumination, and can be used for emergency lights, line lighting, various illuminations, and in-vehicle installations. [Explanation of Symbols]

[0133] 1, 1A, 1B, 1C, 1D: Partition members 10, 10A, 10B, 10C, 10D, 10L: First component 11: Section 1 12: 1st bottom 13:First slope part 14, 141, 142: 1st outer slope part 15, 25, 35: Opening for light source placement 16: First connecting inclined section 17: First protrusion 20, 20A, 20B, 20C, 20D: Second member 21: Section 2 22:Second bottom 23:Second slope part 24:Second outer slope 27: Second protrusion 30, 30B, 30C, 30D: Third member 31: Third Section 32: Third bottom 33: Third slope 34: Third outer slope 40: Circuit board 50: Light source 51: Circuit board 51m:Top surface 55: Covering material 58A, 58B: Conductor wiring 59: Joining member 60: Planar light source 62: Light source 62a: Light-emitting element 62b: Sealing member 62c: Light reflective film 710: Optical Sheet 720: LCD panel 1000: Liquid crystal display device

Claims

1. Multiple light sources, circuit board and A planar light source having a partitioning member, The partition member is A first member is provided on the substrate, and a first partitioned portion is provided, which has a first bottom portion and a first inclined portion surrounding the first bottom portion. A second member is provided on the substrate, and a second compartment is provided which has a second bottom portion and a second inclined portion surrounding the second bottom portion. It has, The first member further has a first outer inclined portion that is connected to the upper end of the first inclined portion located on the outer edge of the second member and overlaps the second inclined portion located on the outer edge of the first member, The lower end of the first outer inclined portion is in contact with the upper surface of the second bottom portion. Openings are provided in the first bottom and the second bottom, The plurality of light sources are planar light sources arranged on the substrate exposed through the opening.

2. In a cross-sectional view, the distance between the upper ends of the first inclined portions facing each other via the first bottom is the same as the distance between the upper end of the first outer inclined portion and the second inclined portion facing the second inclined portion that overlaps with the first outer inclined portion, as described in claim 1.

3. In a cross-sectional view, the width from the lower end of the first outer inclined portion to the lower end of the second inclined portion facing the second inclined portion that overlaps with the first outer inclined portion is the same as the width of the first bottom portion, as described in claim 1 or 2.

4. In a cross-sectional view, the height of the upper end of the second inclined portion located on the outer edge of the first member is lower than the height of the upper end of the first outer inclined portion, as described in any one of claims 1 to 3.

5. In a top view, the first member has a first connecting inclined portion that is connected to each of the first adjacent first outer inclined portions and that overlaps the second inclined portion located below the first outer inclined portion and the adjacent second inclined portion, according to any one of claims 1 to 4.

6. The substrate is disposed of and has a third partition having a third bottom portion and a third inclined portion surrounding the third bottom portion, The second member further has a second outer inclined portion that is connected to the upper end of the second inclined portion located on the outer edge of the third member and overlaps the third inclined portion located on the outer edge of the second member, An opening is provided in the third bottom portion, The planar light source according to any one of claims 1 to 5, wherein the plurality of light sources are arranged on the substrate exposed from the opening.

7. The substrate is disposed of and has a third partition having a third bottom portion and a third inclined portion surrounding the third bottom portion, The third member further has a third outer inclined portion that is connected to the upper end of the third inclined portion located on the outer edge of the second member and overlaps the second inclined portion located on the outer edge of the third member, An opening is provided in the third bottom portion, The planar light source according to any one of claims 1 to 5, wherein the plurality of light sources are arranged on the substrate exposed from the opening.

8. The substrate is disposed of and has a third partition having a third bottom portion and a third inclined portion surrounding the third bottom portion, The first member further has a first outer inclined portion that is connected to the upper end of the first inclined portion located on the outer edge of the third member and overlaps the third inclined portion located on the outer edge of the first member, An opening is provided in the third bottom portion, The planar light source according to any one of claims 1 to 5, wherein the plurality of light sources are arranged on the substrate exposed from the opening.

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