Light emitting device and display device

Abstract

Provided is a light-emitting device having excellent reliability while satisfying high integration of a light source. The light-emitting device has a light source unit, a relay member, and a pressure contact terminal. The light source units each have: a light source plate extending in a first direction; a plurality of light sources arranged on the light source plate in the first direction; and first terminals connected to the plurality of light sources, respectively. The relay member has a plurality of second terminals facing the plurality of light source units in a second direction intersecting the first direction and electrically connected to the first terminals of the plurality of light source units, respectively. The pressure contact terminal is in pressure contact with at least one of the first terminal and the second terminal by a mechanical biasing force, and electrically connects the first terminal and the second terminal.

Description

Technical Field

[0001] The present disclosure relates to a light emitting device suitable for a surface light source, and a display device that displays an image using illumination light emitted by the light emitting device. Background Art

[0002] Hitherto, for example, an illumination device including a light emitting diode (LED) as a light source has been used as a backlight of a liquid crystal display device (for example, see Patent Document 1).

[0003] Reference List

[0004] Patent Literature

[0005] Patent document 1: International Publication No. WO2020 / 039721. Summary of the invention

[0006] Incidentally, in recent years, there is a demand for a light emitting device which includes a plurality of light sources that are highly integrated and which makes it possible to achieve a higher-definition light emission brightness distribution.

[0007] Therefore, a light emitting device having excellent reliability while satisfying high integration of a light source and a display device including the same are desired.

[0008] A light emitting device according to an embodiment of the present disclosure includes a light source unit, a relay member, and a pressure contact terminal. The light source units each include: a light source board extending along a first direction; a plurality of light sources arranged on the light source board along the first direction; and a first terminal coupled to the plurality of light sources. The relay member is opposite to the plurality of light source units in a second direction intersecting the first direction, and includes a plurality of second terminals, each of which is electrically coupled to a corresponding one of the first terminals of the plurality of light source units. The pressure contact terminal is in pressure contact with at least one of the first terminal or the second terminal through a mechanical bias force, and electrically couples the first terminal and the second terminal.

[0009] In the light emitting device according to the embodiment of the present disclosure, the pressure contact terminal is used to electrically couple the first terminal and the second terminal by a mechanical biasing force. This makes it possible to stably maintain the electrical coupling of the first terminal and the second terminal even if the first terminal and the second terminal are extremely small. This also enhances the freedom of selecting the number of electrical contacts per unit area and the position of the electrical contacts. In addition, this helps to reduce the thickness of the entire configuration. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] [ Figure 1A ] Figure 1A is a first perspective view of the light emitting device according to the first embodiment of the present disclosure when viewed from a first direction.

[0011] [ Figure 1B ] Figure 1B When viewed from the second direction Figure 1A A second perspective view of the light emitting device is shown.

[0012] [ Figure 2A ] Figure 2A yes Figure 1A A first enlarged perspective view of a portion of a light emitting device is shown.

[0013] [ Figure 2B ] Figure 2B yes Figure 1B A second enlarged perspective view of a portion of a light emitting device is shown.

[0014] [ Figure 3 ] Figure 3 yes Figure 1A A plan view of the planar configuration of the light emitting device shown.

[0015] [ Figure 4 ] Figure 4 yes Figure 1A A cross-sectional view of a cross-sectional configuration of a portion of the light emitting device shown.

[0016] [ Figure 5 ] Figure 5 yes Figure 1A An enlarged cross-sectional view of an example configuration of a light source is shown.

[0017] [ Figure 6 ] Figure 6 yes Figure 1A An enlarged cross-sectional view of an example configuration of a wavelength conversion sheet is shown.

[0018] [ Figure 7 ] Figure 7 are a plan view and a cross-sectional view of a configuration example of a light emitting device according to a first modified example of the first embodiment.

[0019] [ Figure 8 ] Figure 8 It is used to describe the assembly Figure 7 An explanatory diagram of the method of the light emitting device shown.

[0020] [ Fig. 9 ] Fig. 9 are a plan view and a cross-sectional view of a configuration example of a light emitting device according to a second modified example of the first embodiment.

[0021] [ Fig.10 ] Fig.10 It is used to describe the assembly Fig. 9 An explanatory diagram of the method of the light emitting device shown.

[0022] [ Fig.11 ] Fig.11is a perspective view of an appearance of a display device according to a second embodiment of the present disclosure.

[0023] [ Fig.12 ] Fig.12 yes Fig.11 An exploded perspective view of the body shown.

[0024] [ Fig.13 ] Fig.13 yes Fig.12 An exploded perspective view of the panel module is shown.

[0025] [ Fig.14 ] Fig.14 yes Fig.12 A schematic plan view of an example of a plan configuration of a panel module is shown.

[0026] [ Fig.15 ] Fig.15 is a sectional view of a configuration example of a light emitting device according to a first other modification example of the present disclosure.

[0027] [ Fig.16 ] Fig.16 is a sectional view of a configuration example of a light emitting device according to a second other modification example of the present disclosure.

[0028] [ Fig.17 ] Fig.17 is a sectional view of a configuration example of a light emitting device according to a third other modification example of the present disclosure.

[0029] [ Fig.18 ] Fig.18 is a sectional view of a configuration example of a light emitting device according to a fourth other modification example of the present disclosure.

[0030] [ Fig.19 ] Fig.19 is a sectional view of a configuration example of a light emitting device according to a fifth other modification example of the present disclosure.

[0031] [ Fig. 20 ] Fig. 20 is a sectional view of a configuration example of a light emitting device according to a sixth other modification example of the present disclosure.

[0032] [ Fig.21 ] Fig.21 is a cross-sectional view of a configuration example of a display device according to a seventh other modification example of the present disclosure.

[0033] [ Fig. 22 ] Fig. 22 is a sectional view of a configuration example of a pressure contact terminal according to an eighth other modified example of the present disclosure. DETAILED DESCRIPTION

[0034] Some embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be noted that the description is made in the following order.

[0035] 1. First Embodiment (Light Emitting Device)

[0036] 1.1 Configuration

[0037] 1.2 Function

[0038] 1.3 Effect

[0039] 2. Second Embodiment (Liquid Crystal Display Device)

[0040] 3. Other modification examples

[0041] <1. First Embodiment>

[0042] [1.1 Configuration]

[0043] Figure 1A and Figure 1B Each is a perspective view of a configuration example of the light emitting device 100 according to the first embodiment of the present disclosure. Figure 1A and Figure 1B The light emitting devices 100 are shown viewed from directions diametrically opposite to each other. Figure 2A and Figure 2B Each is an enlarged perspective view of a part of the light emitting device 100 .

[0044] Figure 2A and Figure 2B The light emitting devices 100 are shown viewed from directions diametrically opposite to each other. Figure 2A It shows that from the corresponding Figure 1A The light emitting device 100 is observed in the direction of Figure 2B It shows that from the corresponding Figure 1B More specifically, Figure 2A The intersection XP at which the light source unit 10 (described later) extending in the X-axis direction intersects with the relay board 20 (described later) extending in the Y-axis direction is shown. Figure 2A The light source unit 10 is shown partially cut away to allow a front surface 20FS (described later) of the relay board 20 to be visually recognized. Figure 2B The intersection XP at which the relay plate 20 extending in the Y-axis direction intersects the light source unit 10 extending in the X-axis direction is shown. Figure 2B The relay board 20 is shown partially cut away to allow a rear surface 1BS (described later) of the light source board 1 of the light source unit 10 to be visually recognized. Figure 3 is a plan view of a planar configuration example of the light emitting device 100. In addition, Figure 4It is an enlarged cross-sectional view of an example of a cross-sectional configuration of a part of the light emitting device 100. It should be noted that Figure 4 Shown along Figure 3 The IV-IV cutting line shown is a cross section taken along the arrow direction. The light emitting device 100 is suitable for a surface light source, and is used as a direct backlight installed in a liquid crystal display device, for example.

[0045] The light emitting device 100 includes, for example, a plurality of light source units 10, a relay board 20, a flexible film 30, a pressure contact terminal 50, and a rear chassis 60. The plurality of light source units 10 each extend in the X-axis direction and are arranged to be aligned in the Y-axis direction. In contrast, the relay board 20 extends in the Y-axis direction, for example, and is mechanically coupled to the plurality of light source units 10. The relay board 20 is also electrically coupled to the plurality of light source units 10.

[0046] In the present embodiment, the X-axis direction corresponds to the longitudinal direction of the light source unit 10, the Y-axis direction corresponds to the lateral direction of the light source unit 10, and the Z-axis direction corresponds to the thickness direction of the light source unit 10. The X-axis direction, the Y-axis direction, and the Z-axis direction are perpendicular to each other. The Z-axis direction also corresponds to the direction in which the light source unit 10 and the relay board 20 are relative to each other.

[0047] like Figure 1A As shown, each light source unit 10 includes a light source panel 1 and a plurality of light sources 2. Figure 4 As shown, the light source board 1 has a front surface 1FS and a rear surface 1BS opposite to the front surface 1FS in the thickness direction (Z-axis direction). A plurality of light sources 2 are mounted on a wiring 4 provided on the front surface 1FS side of the light source board 1. The plurality of light sources 2 are arranged in a row at predetermined intervals, for example, along the X-axis direction which is the longitudinal direction of the light source board 1. In addition, the flexible film 30 extends along the XY plane and is provided on the front surface 1FS side of the light source board 1 to completely cover the plurality of light source units 10. Preferably, the plurality of light source units 10 are fixed to the flexible film 30, for example, by bonding. The relay board 20 is provided on the rear surface 1BS side of the light source board 1. In addition, the rear chassis 60 is a support body that supports each of the light source unit 10 and the relay board 20, and is provided opposite to the rear surface 1BS of the light source board 1. It should be noted that, Figure 1A The simplified shape of the rear chassis 60 is shown. Figure 1B and Figure 3 In order to ensure visibility, the rear chassis 60 is omitted from the illustration.

[0048] like Figure 3 As shown, the light emitting device 100 includes a driving element 40. For example, the driving element 40 may be disposed on the light source board 1 of each light source unit 10, or may be disposed on the relay board 20. Figure 4 As shown, the light emitting device 100 may further include a spacer 6 , a diffusion sheet 7 , a wavelength conversion sheet 8 and an optical sheet group 9 .

[0049] (Light source unit 10)

[0050] For example, Figure 1A , Figure 1B and Figure 3 As shown, the plurality of light source units 10 are preferably aligned and spaced apart from each other along the Y-axis direction. Figure 3 As shown in FIG. 1 , the width W1 of each light source unit 10 in the Y-axis direction is preferably narrower than the interval W2 between adjacent light source units 10. This is because the constituent materials of the light source panel 1 and the like can be reduced, thereby achieving weight reduction. Figure 1A , Figure 1B and Figure 3 In the example shown, eight light source units 10 are coupled to one relay board 20 . However, the present disclosure is not limited thereto. Seven or less light source units 10 may be coupled to one relay board 20 , or nine or more light source units 10 may be coupled to one relay board 20 .

[0051] like Figure 4 As shown, the light source unit 10 includes a light source board 1, a plurality of light sources 2, wiring 4, an insulating layer 4Z and a resin layer 5. The light source board 1 is, for example, a plate-like member made of a resin having electrical insulation. Alternatively, the light source board 1 may be a flexible film-like member. As the light source board 1, a resin film may be used, for example, including polyimide (PI), polyethylene terephthalate (PET), polycarbonate (PC), polyethylene naphthalate (PEN), polyetherimide (PEI), liquid crystal polymer (LCP) or fluororesin. Alternatively, as the light source board 1, an insulating resin layer may be used, for example, including polyimide or epoxy resin and formed on the surface of a metal-based substrate including, for example, aluminum (Al). Alternatively, as the light source board 1, a film substrate including a glass-containing resin may be used, such as a glass epoxy resin represented by FR4 or a glass composite resin represented by CEM3. A plurality of wirings 4 and a plurality of light sources 2 arranged in the insulating layer 4Z are mounted on the front surface 1FS side of the light source board 1. In addition, a plurality of first terminals 11 are formed on the rear surface 1BS of the light source board 1. The plurality of first terminals 11 are electrically coupled to the wiring 4 through, for example, through the through-holes 10V. Figure 2B As shown, the plurality of first terminals 11 each extend, for example, in the X-axis direction, and are aligned adjacent to each other in the Y-axis direction. In addition, in the light emitting device 100 according to the present embodiment, the pressure contact terminals 50 are attached to the plurality of first terminals 11, respectively.

[0052] (Light source 2 and wiring 4)

[0053] A plurality of light sources 2 are disposed on the front surface 1FS side of the light source panel 1. As described above, for example, Figure 3As shown, a plurality of light sources 2 are arranged in a row at predetermined intervals along the X-axis direction which is the extension direction of the light source board 1. It should be noted that the intervals between the plurality of light sources 2 are not limited to constant intervals, and may be set to any intervals as required. Alternatively, a plurality of rows of light sources 2 may be arranged on one light source board 1 so that the plurality of rows of light sources 2 arranged along the X-axis direction are adjacent to each other along the Y-axis direction. On the front surface 1FS of the light source board 1, a plurality of wirings 4 having a predetermined pattern shape are formed so that light emission control can be performed independently for each light source 2 or for every two or more light sources 2. The plurality of wirings 4 make it possible to perform local light emission control (local dimming) of the plurality of light sources 2. In the light emitting device 100, for example, the driving element 40 controls the Figure 3 The dotted lines in FIG. 4 indicate the luminous intensity and luminous timing of each unit area A (AL, AC, and AR). The driving element 40 is a driving IC that drives the corresponding light source 2, that is, a driving IC that turns the light source 2 on and off. The driving element 40 is preferably provided on at least one of the relay board 20 and the light source board 1. Figure 3 In the configuration example of , one driving element 40L and one driving element 40R are provided on the light source board 1 , and a driving element 40C is provided on the relay board 20 . Figure 3 In the configuration example, the light source 2 arranged in the unit area AL is coupled to the driving element 40L through the wiring 4, the light source 2 arranged in the unit area AC is coupled to the driving element 40C through the wiring 4, and the light source 2 arranged in the unit area AR is coupled to the driving element 40R through the wiring 4. For example, the driving element 40L drives three light sources 2 arranged in the unit area AL among the plurality of light sources 2 arranged on the light source board 1. For example, the driving element 40C drives three light sources 2 arranged in the unit area AC among the plurality of light sources 2 arranged on the light source board 1. For example, the driving element 40R drives three light sources 2 arranged in the unit area AR among the plurality of light sources 2 arranged on the light source board 1. It should be noted that in Figure 3 In the illustrated example, three light sources 2 are arranged in one unit area A. However, the present disclosure is not limited thereto. The number of light sources 2 included in one unit area A may be one or two, or may be four or more.

[0054] For example, the wiring 4 is formed by pasting a copper foil onto the light source board 1 and then patterning the copper foil by a photolithography method. Alternatively, a metal film may be formed on the light source board 1 by electroplating or a vacuum film forming technique, and then patterning the metal film by a photolithography method to form the wiring 4. Still alternatively, the wiring 4 may also be formed by a printing method such as screen printing or an inkjet method. Examples of constituent materials of the wiring 4 include copper (Cu), aluminum (Al), silver (Ag), and alloys thereof.

[0055] (Resin layer 5)

[0056] The resin layer 5 is, for example, a white resist layer. The resin layer 5 has a relatively high reflectivity relative to the light from the light source 2 and the light having a wavelength converted by the wavelength conversion plate 8. Examples of white resists include inorganic materials such as titanium oxide (TiO2) fine particles and barium sulfate (BaSO4) fine particles, and organic materials such as porous acrylic resin fine particles and polycarbonate resin fine particles having many holes for light scattering. As a constituent material of the resin layer 5, epoxy resins can also be used. In addition, the resin layer 5 may include a resin containing fine particles of an inorganic material such as titanium oxide (TiO2) fine particles and barium sulfate (BaSO4) fine particles. It should be noted that the flexible film 30 is bonded to the front surface of the resin layer 5 except for the area where the light source 2 is provided.

[0057] (Details of light source 2)

[0058] For example, Figure 5 yes Figure 1A FIG. 2 is an enlarged cross-sectional view of an example of the configuration of the light source 2 shown. It should be noted that Figure 5 Also shown is a flexible membrane 30. Figure 5 As shown, the light source 2 is a so-called direct potting type light source, and includes a light emitting element 21 and a sealing lens 22. The light emitting element 21 includes, for example, a semiconductor layer 23 including a light emitting body, and a reflective layer 25 arranged opposite to the semiconductor layer 23 in the Z-axis direction, with a transparent layer 24 interposed therebetween.

[0059] The transparent layer 24 includes, for example, sapphire or silicon carbide (SiC). The semiconductor layer 23 is formed by, for example, stacking an n-type semiconductor layer, an active layer, and a p-type semiconductor layer in sequence from the transparent layer 24 side. The n-type semiconductor layer includes, for example, an n-type nitride semiconductor (for example, n-type GaN). The active layer includes, for example, a nitride semiconductor (for example, n-type GaN) having a quantum well structure. The p-type semiconductor layer includes, for example, a p-type nitride semiconductor (for example, p-type GaN). The semiconductor layer 23 includes, for example, a blue light emitting diode (LED) emitting blue light (for example, with a wavelength of 440nm to 460nm). The reflective layer 25 is disposed on the surface of the transparent layer 24 opposite to the semiconductor layer 23. The reflective layer 25 includes a material having a high reflectivity. Specifically, the reflective layer 25 includes a silver vapor deposition film, an aluminum vapor deposition film, a multilayer reflective film, and the like. Examples of multilayer reflective films include distributed Bragg reflectors (DBRs).

[0060] like Figure 5 As shown, in the light emitting element 21, the light LB emitted from the active layer of the semiconductor layer 23 is reflected by the reflective layer 25, and then enters the sealing lens 22 through the end surface 24T of the transparent layer 24. The light LB that has entered the sealing lens 22 passes through the sealing lens 22 and is output to the surrounding environment. It should be noted that the light LB is optically acted upon passing through the sealing lens 22.

[0061] For example, the sealing lens 22 is an optical member including a transparent resin such as a silicone resin or an acrylic resin. The sealing lens 22 completely covers the light emitting element 21 and is configured to seal the light emitting element 21. The refractive index of the sealing lens 22 is between the refractive index of the semiconductor layer 23 of the light emitting element 21 and the refractive index of the air. The sealing lens 22 protects the light emitting element 21 and improves the extraction efficiency of the light emitted from the light emitting element 21. The external shape of the sealing lens 22 is not particularly limited as long as it has an optical effect as a lens for extracting the light LB emitted from the light emitting element 21. For example, the external shape of the sealing lens 22 is not limited to a shape including a spherical surface, and may be a shape including an aspherical surface. In addition, the sealing lens 22 can control the light distribution direction of the light LB emitted from the light emitting element 21.

[0062] Because the light source 2 has a direct potting type configuration, it is easy to shape the sealing lens 22 into a dome shape with an aspect ratio of 0.2 or more and 1 or less. Specifically, when the sealing lens 22 is shaped into a dome shape with an aspect ratio in the range of 0.4 to 0.6, brightness uniformity characteristics such as brightness unevenness become good. Here, the aspect ratio is a ratio h / r of the height h of the dome lens shape to the radius r. When the aspect ratio is 1, the sealing lens 22 has a hemispherical shape.

[0063] (Wavelength conversion sheet 8)

[0064] The wavelength conversion sheet 8 is disposed to face the plurality of light sources 2 . Figure 6 yes Figure 4 FIG. 8 is an enlarged cross-sectional view of a portion of the wavelength conversion sheet 8 shown. Figure 6 As shown, the wavelength conversion sheet 8 includes, for example, a wavelength conversion substance 81 in the form of particles. The wavelength conversion substance 81 includes, for example, a phosphor (fluorescent material) such as a fluorescent pigment or a fluorescent dye or quantum dots. The wavelength conversion substance 81 is excited by the light from the light source 2, and converts the light from the light source 2 into light with a wavelength different from the original wavelength, for example, according to the principle of fluorescent emission, and outputs the light. It should be noted that in Figure 6 , for simplicity, the wavelength conversion substance 81 is shown in a particle form. However, in the present disclosure, the wavelength conversion substance 81 is not limited to a substance formed in a particle form.

[0065] The wavelength conversion substance 81 included in the wavelength conversion sheet 8 absorbs the blue light emitted from the light source 2 and converts a portion of the blue light into red light (e.g., a wavelength of 620nm to 750nm) or green light (e.g., a wavelength of 495nm to 570nm). In this case, the light from the light source 2 passes through the wavelength conversion sheet 8, whereby the red light, the green light, and the blue light are combined to produce white light. Alternatively, the wavelength conversion substance 81 included in the wavelength conversion sheet 8 may absorb the blue light and convert a portion of the blue light into yellow light. In this case, the light from the light source 2 passes through the wavelength conversion sheet 8, whereby the yellow light and the blue light are combined to produce white light.

[0066] Preferably, the wavelength conversion material 81 included in the wavelength conversion sheet 8 includes quantum dots. Quantum dots are particles with a large diameter of 1nm to 100nm and have discrete energy levels. Since the energy state of quantum dots depends on their size, the emission wavelength can be freely selected by changing the size. In addition, the spectral width of the light emitted from the quantum dots is narrow. The color gamut is expanded by combining light with such a steep peak. Therefore, using quantum dots as wavelength conversion materials makes it easy to expand the color gamut. In addition, quantum dots have high responsiveness, making it possible to effectively use the light of the light source 2. In addition, the stability of quantum dots is also high. Quantum dots are, for example, compounds of group 12 elements and group 16 elements, compounds of group 13 elements and group 16 elements, or compounds of group 14 elements and group 16 elements. Examples of quantum dots include CdSe, CdTe, ZnS, CdS, PbS, PbSe, and CdHgTe. In addition, due to environmental regulations such as RoHS regulations, requirements are also made for Cd-free quantum dots. Examples of the core material include InP-based materials, CsPbBr 3 -based materials such as perovskite, Zn(Te, Se), and indium sulfide-silver which is one of the ternary systems of Group I-III-VI.

[0067] (Diffuser 7)

[0068] The diffuser 7 is an optical member disposed between the wavelength conversion sheet 8 and the plurality of light sources 2. The diffuser 7 makes the angle distribution of the incident light uniform. The diffuser 7 may include one diffuser plate or one diffuser sheet, or may include two or more diffuser plates or two or more diffuser sheets. In addition, the diffuser 7 may be a plate-shaped optical member having a constant thickness and a constant hardness.

[0069] (Spacer 6)

[0070] The spacer 6 is a member that maintains the optical distance between the light source 2 and the diffusion sheet 7 .

[0071] (Optical sheet set 9)

[0072] The optical sheet group 9 is an optical member provided on the light emitting surface side of the wavelength conversion sheet 8, that is, on the side opposite to the diffusion sheet 7 when viewed from the wavelength conversion sheet 8. The optical sheet group 9 includes, for example, a sheet or film for improving brightness. Figure 4 In the example shown, the optical sheet group 9 is formed by sequentially stacking an optical sheet 91 and an optical sheet 92 on the wavelength conversion sheet 8. The optical sheet 91 and the optical sheet 92 may be bonded to each other and integrated. The optical sheet 91 is, for example, a prism sheet. The optical sheet 92 is, for example, a reflective polarizing film such as a dual brightness enhancement film (DBEF). It should be noted that the number of optical sheets included in the optical sheet group 9, the types of the multiple optical sheets included in the optical sheet group 9, the stacking order, etc. may be selected as needed.

[0073] (Flexible film 30)

[0074] The flexible film 30 is selectively provided on the resin layer 5. More specifically, the flexible film 30 is provided in an area of ​​the front surface 1FS except for an area where the plurality of light sources 2 are provided. The flexible film 30 is provided with an opening 30K in an area overlapping with the plurality of light sources 2 in the Z-axis direction. The opening 30K is a punching hole in which the light source 2 is provided. In the area where the opening 30K is formed, the resin layer 5 is exposed, and the exposed resin layer 5 is covered by the sealing lens 22 of the light source 2. The flexible film 30 is bonded to the front surface of the resin layer 5 extending on the XY plane. Specifically, the flexible film 30 is fixed to the front surface of the resin layer 50 by an adhesive, a double-sided tape, screw fastening, etc. Alternatively, the flexible film 30 may be sandwiched between the spacer 6 and the resin layer 5. The flexible film 30 is, for example, a reflective sheet, and has a high reflectivity for the light LB from the light source 2 and the light LY converted in wavelength by the wavelength conversion sheet 8. The flexible film 30 may include titanium oxide or Ag (silver) as a material having a high reflectivity. Specifically, the flexible film 30 is, for example, a white resist layer. Examples of white resists include inorganic materials such as titanium oxide (TiO2) fine particles and barium sulfate (BaSO4) fine particles, and organic materials such as porous acrylic resin fine particles and polycarbonate resin fine particles having many holes for light scattering. As a constituent material of the flexible film 30, epoxy resins can also be used. In addition, the flexible film 30 may include a resin containing fine particles of an inorganic material such as titanium oxide (TiO2) fine particles and barium sulfate (BaSO4) fine particles.

[0075] As described above, the flexible film 30 is a reflective sheet. Therefore, the return light of the light LB and the light LY reflected by the wavelength conversion sheet 8 or the optical sheet group 9 is reflected by the flexible film 30 and used as recycled light for generating white light. This makes it possible to improve the overall brightness of the light emitting device 100.

[0076] (Relay board 20)

[0077] The relay board 20 is a component that electrically and mechanically connects a plurality of light source units 10, and relays the plurality of light source units 10 through a power circuit, a driving circuit, and the like. Similar to the light source board 1, the relay board 20 includes, for example, a plate-like component. Alternatively, the relay board 20 may include a flexible film component. A material similar to that of the light source board 1 can be used as a constituent material of the relay board 20. That is, as the relay board 20, for example, a film made of a resin including polyimide (PI), polyethylene terephthalate (PET), polycarbonate (PC), polyethylene naphthalate (PEN), polyetherimide (PEI), liquid crystal polymer (LCP), or fluororesin can be used. Alternatively, as the relay board 20, for example, an insulating resin layer including polyimide or epoxy resin and formed on the surface of a metal-based substrate including aluminum (Al) can be used. Alternatively, as the relay board 20, a film substrate including a glass-containing resin, such as a glass epoxy resin represented by FR4 or a glass composite resin represented by CEM3, can be used. A plurality of second terminals 12 are formed on the front surface 20FS of the relay board 20, that is, on the surface opposite to the light source board 1. In addition, a plurality of wirings 53 can be formed on the rear surface 20BS of the relay board 20, that is, on the surface opposite to the light source board 1. The second terminal 12 is electrically coupled to the wiring 53, for example, through a through hole 20V. It should be noted that, similar to the plurality of first terminals 11, the plurality of second terminals 12 extend, for example, in the X-axis direction and are aligned adjacent to each other in the Y-axis direction. In addition, in the light-emitting device 100 according to the present embodiment, as described later, the pressure contact terminal 50 attached to the plurality of first terminals 11 is in pressure contact with a corresponding one of the plurality of second terminals 12.

[0078] like Figure 2A and Figure 2B As shown, at the intersection XP of each light source unit 10 and the relay board 20, a plurality of first terminals 11 and a plurality of second terminals 12 are arranged to be opposite to each other in the Z-axis direction. Figure 4 As shown, the plurality of second terminals 12 of the relay board 20 are electrically coupled to corresponding ones of the plurality of first terminals 11 of each light source unit 10 through corresponding ones of the plurality of pressure contact terminals 50 , respectively.

[0079] (Pressure contact terminal 50)

[0080] At each intersection XP of the plurality of light source units 10 and the relay board 20, the pressure contact terminal 50 is disposed between the rear surface 1BS of the light source board 1 and the front surface 20FS of the relay board 20 in the Z-axis direction ( Figure 2B and Figure 4). The pressure contact terminal 50 is a conductive member that is in pressure contact with at least one of the first terminal 11 and the second terminal 12 by a mechanical bias force and electrically couples the first terminal 11 with the second terminal 12. The pressure contact terminal 50 includes, for example, a base 51 and an elastic portion 52. The base 51 is fixed to the first terminal 11. The elastic portion 52 is attached to the base 51 and exhibits elasticity. The elastic portion 52 includes, for example, a leaf spring and is configured to bend in the Z-axis direction. Figure 4 In the example shown, the elastic portion 52 extends in the X-axis direction, and the distal end of the elastic portion 52, that is, the end opposite to the base 51, serves as a pressure contact portion 52T that is in pressure contact with the second terminal 12. The pressure contact portion 52T is pressed against the second terminal 12 by the elasticity of the elastic portion 52. That is, the pressure contact terminal 500 applies a biasing force F50 to the second terminal 12 in the -Z direction. The pressure contact terminal 50 includes, for example, a metal material such as copper.

[0081] (Rear chassis 60)

[0082] The rear chassis 60 is a support body that supports a plurality of light source units 10 and a relay board 20. The rear chassis 60 has a front surface 60FS and a recess 60U. The front surface 60FS is opposite to the rear surface 1BS of the light source board 1 of the light source unit 10. The recess 60U is recessed away from the rear surface 1BS. The relay board 20 is accommodated in the recess 60U. Each of the light source units 10 is bonded and fixed to the rear chassis 60 using, for example, an insulating adhesive layer Z1 provided between the rear surface 1BS and the front surface 60FS of the rear chassis 60. It should be noted that, instead of being bonded and fixed using the insulating adhesive layer Z1, each of the light source units 10 can be fixed to the rear chassis 60 by screw fastening using screws. In addition, a mating portion can be provided on both the rear surface 1BS and the front surface 60FS, and each of the light source units 10 can be fixed to the rear chassis 60 by mating the mating portions with each other. Similarly, the relay board 20 is bonded and fixed to the rear chassis 60 using, for example, an insulating adhesive layer Z2 provided between the rear surface 20BS and the recess 60U of the rear chassis 60. In this case, instead of bonding and fixing using the insulating adhesive layer Z2, the relay board 20 may also be fixed to the rear chassis 60 by screw fastening using screws. In addition, the mating portion may be provided on both the rear surface 20BS and the recess 60U, and each of the light source units 10 may be fixed to the rear chassis 60 by mating the mating portions with each other.

[0083] [1.2 Function]

[0084] In the light emitting device 100 according to this embodiment, as Figure 4As shown, a portion of the blue light LB emitted from the light source 2 is converted into light LY that is wavelength-converted (emitted) by a wavelength conversion substance included in the wavelength conversion sheet 8. The wavelength-converted light LY is, for example, red light and green light or yellow light. The wavelength-converted light LY is reflected and outputted from the wavelength conversion sheet 8 evenly and uniformly in all directions. The blue light LB that is not absorbed by the wavelength conversion substance 81 of the blue light LB emitted from the light source 2 is also outputted evenly and uniformly in all directions from the wavelength conversion sheet 8. The wavelength conversion substance 81 ( Figure 6 ) is output as is from the wavelength conversion sheet 8. The light ahead of the blue light LB that has not been wavelength converted and the light ahead of the light LY that has been wavelength converted are combined to generate white light that is output forward (outside the light source device).

[0085] In the light-emitting device 100 according to the present embodiment, a plurality of light source units each including a plurality of light sources arranged thereon are coupled to one relay board 20. Therefore, the arrangement position of each of the plurality of light source units 10 can be finely adjusted, thereby facilitating optimization of the arrangement position of each light source 2. This is also advantageous for reducing the weight of the light-emitting device 100. That is, by coupling the plurality of light source units 10 to one relay board 20, the amount of material used for the light source board 1 can be reduced, and the weight and cost of the light-emitting device 100 including the plurality of light sources 2 can be reduced, compared with a configuration in which the plurality of light sources are arranged on a plate-shaped substrate, for example. Therefore, according to the light-emitting device 100, a high-definition light emission brightness distribution can be achieved while achieving weight reduction and cost reduction.

[0086] In the light emitting device 100 according to the present embodiment, the plurality of light source units 10 are arranged to be spaced apart from each other in the Y-axis direction. Therefore, compared with a configuration in which the plurality of light sources 2 are arranged on a plate-shaped light source board, the amount of material used for the light source board 1 can be reduced, and the weight and cost of the light emitting device 100 including the plurality of light sources 2 can be reduced.

[0087] Furthermore, in the light emitting device 100 according to the present embodiment, the width W1 of the light source unit 10 in the Y-axis direction is narrower than the interval W2 between adjacent light source units in the Y-axis direction of the plurality of light source units 10. Therefore, for example, when a predetermined number of light sources 2 are arranged as a whole of the light emitting device 100, the amount of material used for the light source board 1 can be reduced, as compared to the case where the width W1 is equal to or greater than the interval W2, and the weight and cost of the light emitting device 100 can be further reduced.

[0088] Furthermore, in the light emitting device 100 according to the present embodiment, the plurality of light sources 2 are arranged in a row along the X-axis direction on the light source board 1. Therefore, for example, when a predetermined number of light sources 2 are arranged as the entirety of the light emitting device 100, the amount of material used for the light source board 1 can be reduced, and the weight and cost can be further reduced, compared to the case where the plurality of light sources 2 are arranged in a plurality of rows.

[0089] In addition, in the light emitting device 100, the plurality of light source units 10 and the relay board 20 perform electrical coupling of the first terminal 11 and the second terminal 12 by the mechanical biasing force of the pressure contact terminal 50. Therefore, for example, compared with the case of using a connector for joining, the joint between the plurality of light source units 10 and the relay board 20 can be simplified, and the size, thickness and weight of the joint can be reduced. Therefore, compared with the case of using a connector, the size of each light source unit 10 can be reduced, and the number of light sources 2 per unit area can be increased. That is, a high degree of integration of the plurality of light sources 2 can be achieved.

[0090] In addition, in the light emitting device 100, a pressure contact terminal 50 is used. Therefore, compared with the case of using a connector, the ease of manufacturing is improved. That is, in the connector coupling, high-precision alignment is required. However, in the case of using the pressure contact terminal 50, as long as a part of the pressure contact terminal 50 is in contact with each other, the pressure contact terminal 50 is electrically coupled to each of the first terminal 11 and the second terminal 12. This eliminates the need for high-precision alignment required in the connector coupling. In addition, in the light emitting device 100, the light source unit 10 (the pressure contact terminal 50 is attached to the first terminal 11) is bonded and fixed to the rear chassis 60 (the relay board 20 is accommodated in the recess 60U) using the insulating adhesive layer Z1 that naturally makes the pressure contact terminal 50 contact the second terminal 12 under pressure. Therefore, when manufacturing the light emitting device 100, the mechanical coupling operation of fixing the light source unit 10 to the relay board 20 and the operation of electrically coupling the light source unit 10 to the relay board 20 can be performed simultaneously.

[0091] Furthermore, in the light emitting device 100, the pressure contact terminal 50 is used. Therefore, compared with, for example, the case of using a connector, the degree of freedom in designing the number and arrangement positions of the electrical contacts is improved.

[0092] Furthermore, in the light emitting device 100, electrical coupling is ensured by the pressure contact terminal 50 at multiple positions within each predetermined area at each intersection XP of the multiple light source units 10 and the relay board 20. Each of the multiple light source units 10 and the relay board 20 is electrically coupled at multiple positions, so that multiple channels such as a signal transmission path and a power supply path can be ensured between each of the light source units 10 and the relay board 20. Therefore, the light emitting device 100 is allowed to have more functions.

[0093] Furthermore, in the light emitting device 100, the light source board 1 has flexibility, or both the light source board 1 and the relay board 20 have flexibility. Therefore, for example, the light emitting device 100 can be appropriately applied to a display device having a curved screen.

[0094] In addition, in the light emitting device 100, a plurality of light source units 10 are fixed and integrated by one flexible film 30. This makes it easy to handle semi-finished products, for example, during the manufacturing process. For example, a batch operation of bonding a plurality of light source units 10 to the relay board 20 can be performed, which can improve the ease of manufacturing.

[0095] Furthermore, in the light emitting device 100 , the flexible film 30 is bonded to the surface of the resin layer 5 of the light source unit 10 , which is the surface extending on the XY plane. Therefore, the plurality of light source units 10 are more stably held relative to the flexible film 30 .

[0096] Furthermore, in the light emitting device 100, the flexible film 30 has the opening 30K in the region overlapping with the light source 2 in the Z-axis direction. Therefore, even when the flexible film 30 is provided on the light emitting side of the light source 2, the flexible film 30 can be bonded to the plurality of light source units 10 while avoiding the region where the light source 2 exists. Therefore, it is possible to avoid inhibiting the travel of light emitted by the flexible film 30.

[0097] Furthermore, in the light emitting device 100, a driving element that drives the plurality of light sources 2 is provided on at least one of the relay board 20 and the light source board 1. Therefore, the plurality of light sources 2 can be driven at a higher speed than when the driving element 40 is provided outside the light emitting device 100. Specifically, since the driving element 40 is provided on the light source board 1 and drives some of the light sources 2 near the driving element 40 among the plurality of light sources 2 provided on the light source board 1, the responsiveness of the light source 2 can be further enhanced.

[0098] [1.3 Effect]

[0099] As described above, according to the light emitting device 100 of this embodiment, a plurality of light sources can be arranged at a higher density and excellent light emitting performance can be achieved. In addition, weight reduction can also be achieved. In addition, ease of manufacturing can also be improved.

[0100] [1.4 Modification example of first embodiment]

[0101] (First Modification Example)

[0102] Figure 7 are a plan view and a cross-sectional view of a configuration example of a light emitting device 100 - 1 according to a first modified example of the first embodiment, wherein Figure 7 (A) is a plan view of a light source unit 10 and a relay board 20 attached to a rear chassis 60, and Figure 7(B) is along Figure 7 (A) is a cross-sectional view of a section taken along the arrow direction along the VII-VII cutting line. Note that Figure 7 Only the light source panel 1 of the light source unit 10 is shown, and the light source 2 and the like are not shown.

[0103] In the light emitting device 100 according to the above-described first embodiment, the light source unit 10 is attached to the rear chassis 60 using the insulating adhesive layer Z1. However, the present disclosure is not limited thereto. Figure 7 In the light emitting device 100-1 of the first modified example shown, the light source board 1 of each of the light source units 10 has an opening 1K and a recess 1U. The opening 1K is a specific example corresponding to the "first engaging portion" of the present disclosure. It should be noted that Figure 7 The opening 1K shown is an example and is not limited in shape and size. Figure 7 The opening 1K shown. For example, a recess or a hook may be provided instead of the opening 1K. In addition, the recess 1U is a specific example corresponding to the "first mating portion" of the present disclosure. It should be noted that Figure 7 The recess 1U shown is an example and is not limited to the shape and size. Figure 7 For example, a convex portion may be provided instead of the concave portion 1U.

[0104] Furthermore, in the light emitting device 100-1, the rear chassis 60 has a hook portion 60K and a convex portion 60T. The hook portion 60K is a specific example corresponding to the "second engaging portion" of the present disclosure. It should be noted that Figure 7 The hook portion 60K shown is an example and is not limited to the following in terms of shape and size. Figure 7 The hook portion 60K shown. In addition, the protrusion 60T is a specific example corresponding to the "second matching portion" of the present disclosure. It should be noted that Figure 7 The convex portion 60T shown is an example and is not limited in shape and size. Figure 7 For example, a concave portion may be provided instead of the convex portion 60T.

[0105] like Figure 7 As shown, in the lighting device 100 - 1 , the hook 60K engages with the opening 1K, and the convex portion 60T fits into the concave portion 1U at the position where the hook 60K engages with the opening 1K. By doing so, the light source board 1 of the light source unit 10 is fixed to the rear chassis 60 .

[0106] Figure 8 It is used to describe the assembly Figure 7 FIG. 1 is an explanatory diagram of a method for producing a light emitting device 100-1. Figure 8As shown in (A), the light source unit 10 is aligned with the rear chassis 60 on the XY plane so as to be located at a position where the opening 1K and the hook portion 60K overlap each other in the Z-axis direction. Thereafter, the light source unit 10 is moved closer to the rear chassis 60 from above in the -Z direction to insert the hook portion 60K into the opening 1K. Figure 8 As shown in (B), the light source unit 10 slides relative to the rear chassis 60 in the -X direction, as shown by the arrow. By doing so, Figure 8 As shown in (C), the concave portion 1U and the convex portion 60T cooperate with each other at the position where the opening 1K and the hook portion 60K engage with each other. That is, the rear chassis 60 and the light source unit 10 move relatively in the -X direction as the third direction, so that the opening 1K as the first engaging portion and the hook portion 60K as the second engaging portion engage with each other. Therefore, the light source board 1 of the light source unit 10 is fixed to the rear chassis 60.

[0107] (Second Modification Example)

[0108] Fig. 9 are a plan view and a cross-sectional view of a configuration example of a light emitting device 100 - 2 according to a second modified example of the first embodiment, wherein Fig. 9 (A) is a plan view of the light source unit 10 and the relay board 20 attached to the rear chassis 60, and Fig. 9 (B) is along Fig. 9 The sectional view is taken along the arrow direction along the IX-IX cutting line indicated in (A). It should be noted that Fig. 9 Only the light source panel 1 of the light source unit 10 is shown, and the light source 2 and the like are not shown.

[0109] In accordance with Fig. 9 In the light emitting device 100-2 of the second modified example shown, the light source board 1 of each of the light source units 10 is fixed to the relay board 20. In the light emitting device 100-2, the light source board 1 of each of the light source units 10 has a through hole 1H, and the relay board 20 includes a plurality of pins 20P. Here, the plurality of pins 20P are respectively inserted into corresponding ones of the plurality of through holes 1H and are engaged with the plurality of through holes 1H. The through hole 1H is a specific example of the "third engaging portion" of the present disclosure. It should be noted that Fig. 9 The through hole 1H shown is an example and is not limited in shape and size. Fig. 9 The through hole 1H shown. In addition, the pin 20P is a specific example of the "fourth engaging portion" of the present disclosure. It should be noted that Fig. 9 The pin 20P shown is an example and is not limited in shape and size. Fig. 9 Pin 20P shown.

[0110] Fig.10 20P and its vicinity are enlarged cross-sectional views. Fig.10As shown, the pin 20P includes two ends 20T1 and 20T2 divided in the X-axis direction and supports 20S1 and 20S2 supporting the ends 20T1 and 20T2. The pin 20P is configured so that the ends 20T1 and 20T2 contact each other or are spaced apart from each other by bending the supports 20S1 and 20S2. Fig.10 (A) shows a state in which the ends 20T1 and 20T2 of the pins 20P are inserted into the through holes 1H of the light source board 1 in the process of fixing the light source board 1 to the relay board 20 using the pins 20P. Fig.10 In the state of (A), the end portion 20T1 and the end portion 20T2 are in contact with each other. In contrast, Fig.10 (B) shows a state in which the light source board 1 is locked by the pin 20P, and in this state, the end portion 20T1 and the end portion 20T2 are spaced apart from each other. Fig.10 As shown in (B), the end portion 20T1 and the end portion 20T2 having passed through the through hole 1H are spaced apart from each other in the X-axis direction so as to contact the inner edge of the through hole 1H. Therefore, the light source board 1 is locked by the pin 20P.

[0111] <2. Second Embodiment>

[0112] [2.1 Configuration]

[0113] Fig.11 The appearance of a display device 101 according to a second embodiment of the present technology is shown. The display device 101 includes a light emitting device 100, and is used as a flat-panel television device, for example. The display device 101 has a configuration in which a flat-plate-shaped main body 102 for image display is supported by a bracket 103. It should be noted that the display device 101 is used as a fixed display device that is placed on a horizontal surface such as a floor, a shelf, a table, etc. in a state in which the bracket 103 is attached to the main body 102. Alternatively, the display device 101 can be used as a wall-mounted display device in a state in which the bracket 103 is separated from the main body 102.

[0114] Fig.12 yes Fig.11 1 is an exploded view of the main body 102 shown. The main body 102 includes, for example, a front external member (frame) 111, a panel module 112, and a rear external member (rear cover) 113 in sequence from the front side (observer side). The front external member 111 is a frame-shaped member covering the peripheral edge of the front surface of the panel module 112, and a pair of speakers 114 are provided at the lower part of the frame-shaped member. The panel module 112 is fixed to the front external member 111. A power board 115 and a signal board 116 are mounted on the rear surface of the panel module 112, and a fixing bracket 117 is fixed to the rear surface of the panel module 112. The fixing bracket 117 is used to fix a wall-mounted mounting bracket, a fixing plate, etc., as well as the fixing bracket 103. The rear external member 113 covers the rear surface and side surfaces of the panel module 112.

[0115] Fig.13 yes Fig.12 1 is an exploded view of the panel module 112. The panel module 112 includes, for example, in order from the front side (observer side), a front housing (top chassis) 121, a liquid crystal panel 122, a frame-shaped member (middle chassis) 123, the light emitting device 100, a rear housing (rear chassis) 124, and a timing controller board 127.

[0116] The front housing 121 is a frame-shaped metal member covering the peripheral edge of the front surface of the liquid crystal panel 122. The liquid crystal panel 122 includes, for example, a liquid crystal cell 122A, a source plate 122B, and a flexible board 122C such as a chip on film (COF) coupling these components. The frame-shaped member 123 is a resin member that holds the frame shape of the liquid crystal panel 122. The rear housing 124 is a metal member that includes iron (Fe) and the like and contains the liquid crystal panel 122, the frame-shaped member 123, and the light-emitting device 100. A timing controller board 127 is also mounted on the rear surface of the rear housing 124.

[0117] Fig.14 1 is a schematic plan view of a more specific configuration example of the panel module 112. Fig.14 In the example of the light emitting device 100 shown, a total of twelve light source units 10 are arranged in an area corresponding to the display area extending along the H direction (horizontal direction) and the V direction (vertical direction) of the liquid crystal panel 122. Specifically, six rows of light source units 10 are arranged along the H direction, and two rows of light source units 10 are arranged along the V direction. In each light source unit 10, for example, the longitudinal direction of the plurality of light source panels 1 corresponds to the H direction, and the longitudinal direction of the relay board 20 corresponds to the V direction. It should be noted that in Fig.14 The flexible film 30 is omitted in the figure. Fig.10 As shown, in the panel module 112, the timing controller board 127 is provided, for example, in the central area of ​​the light emitting device 100. The timing controller board 127 and the plurality of light source units 10 (10-1 to 10-12) are coupled to each other, for example, using cables CB (CB1 to CB12) and connectors CN (CN1 to CN12), respectively.

[0118] [2.2 Function and Effect]

[0119] In the display device 101, the liquid crystal panel 122 selectively transmits light from the light emitting device 100 to display an image. Here, as described in the first embodiment, since the display device 101 includes the light emitting device 100 having excellent light emission controllability and enhanced light emission efficiency, it is desirable to improve the display quality of the display device 101.

[0120] <3. Other modification examples>

[0121] Although the present disclosure has been described above with reference to the embodiments and modified examples, the present disclosure is not limited to the above embodiments, etc., and can be modified in various ways. For example, the materials, types, arrangement positions, shapes, etc. of the constituent elements of the light emitting device described in the above embodiments are not limited to those described above.

[0122] [3.1 Modification Example 3-1]

[0123] Fig.15 3-1 is an enlarged cross-sectional view of a portion of a light emitting device 100A according to a modified example 3-1 of the present disclosure. In the above-mentioned first embodiment, the light emitting element 21 is sealed with a sealing lens 22. However, the present disclosure is not limited thereto. The light emitting device 100A includes a light source 2A instead of the light source 2. The light source 2A has a light emitting element 21A instead of the light emitting element 21, and has a cover lens 22A instead of the sealing lens 22.

[0124] The light emitting element 21A is, for example, a packaged blue LED. Specifically, the light emitting element 21A includes a light emitting layer 26, a base 27 and a sealing material 28. The base 27 has a concave retaining portion. The light emitting layer 26 is arranged on the bottom surface of the retaining portion of the base 27. The retaining portion of the base 27 is filled with a sealing material 28. The light emitting layer 26 is, for example, a point light source, and is specifically a blue LED. The base 27 is mounted on the light source board 1 by welding or the like via external electrodes including a lead frame or the like. The retaining portion of the base 27 preferably has a surface having a high reflectivity relative to the light from the light emitting layer 26. The surface of the retaining portion of the base 27 may, for example, include Ag as a material having a high reflectivity. The sealing material 28 includes, for example, a transparent resin such as silicone or acrylic. The cover lens 22A is arranged directly above the light emitting element 21A while being spaced apart from the light emitting element 21A. At the center position of the cover lens 22A, an incident surface 22A1 having a concave shape facing the light emitting element 21A is provided to be opposite to the light emitting element 21A in the Z-axis direction. In addition, for example, the cover lens 22A has an exit surface 22A2 having a convex shape facing the diffusion sheet 7. The incident surface 22A1 and the exit surface 22A2 each diffuse the blue light LB from the light emitting element 21A.

[0125] In the light emitting device 100A having such a configuration, blue light emitted from the light emitting element 21A is diffused by the cover lens 22A and the diffusion sheet 7, and then converted from blue light to white light while passing through the wavelength conversion sheet 8. The white light obtained as a result of the conversion of the blue light is further subjected to brightness enhancement or uniformization by the optical sheet group 9, and is incident on a liquid crystal display panel or the like.

[0126] [3.2 Modification Example 3-2]

[0127] In the light emitting device 100A according to the above-mentioned modification example 3-1, a packaged blue LED is used as the light emitting element 21A. However, the present disclosure is not limited thereto. Fig.16 As shown in the light emitting element 21B of the light emitting device 100B according to the modified example 3-2 of the present disclosure, a packaged white LED may be used instead of a packaged blue LED. The light emitting element 21B includes: a light emitting layer 26 including a blue LED, a base 27, and a sealing material 29 including a transparent resin containing a wavelength conversion substance. It should be noted that in the light emitting device 100B, the wavelength conversion sheet 8 is unnecessary. Fig.15 This is advantageous in reducing the thickness of the entire configuration compared to the light emitting device 100A.

[0128] [3.3 Modification Example 3-3]

[0129] Furthermore, the light emitting device of the present disclosure is not limited to a light emitting device in which a lens is provided on the emission side of a light emitting element. Fig.17 As with the light emitting device 100C according to the modified example 3-3 of the present disclosure, for example, a plurality of light emitting elements 21C packaged as blue LEDs may be arranged without providing various lenses. Fig.15 The configuration of the light emitting element 21A shown is substantially the same configuration, and includes, for example, a light emitting layer 26 including a blue LED, a base 27, and a sealing material 28. In the light emitting device 100C having such a configuration, blue light emitted from the light emitting element 21C is diffused by the diffusion sheet 7, and then converted from blue light to white light when passing through the wavelength conversion sheet 8. The white light obtained as a result of the conversion of the blue light is further subjected to brightness enhancement or uniformization by the optical sheet group 9, and is incident on a liquid crystal display panel or the like.

[0130] [3.4 Modification Example 3-4]

[0131] In the light emitting device 100C according to the above-mentioned modification example 3-3, a packaged blue LED is used as the light emitting element 21C. However, the present disclosure is not limited thereto. Fig.18 As in the light emitting element 21D of the light emitting device 100D according to the modification example 3-4 of the present disclosure, a packaged white LED may be used instead of a packaged blue LED. The light emitting element 21D has the same Fig.16 The configuration of the light emitting element 21B shown is substantially the same configuration, and includes, for example, a light emitting layer 26 including, for example, a blue LED, a base 27 , and a sealing material 29 including a transparent resin containing a wavelength converting substance.

[0132] [3.5 Modification Example 3-5]

[0133] Fig.19The light emitting device 100E according to the modification example 3-5 of the present disclosure shown includes a light emitting element 21E having a dome-shaped sealing material 28. The light emitting element 21E has a configuration substantially the same as that of the light emitting element 21C, except that the shape of the sealing material 28 is different. Since the sealing material 28 in the light emitting element 21E has a dome shape, the sealing material 28 is allowed to have a lens effect. Therefore, the desired alignment performance can be easily obtained.

[0134] [3.6 Modification Example 3-6]

[0135] Fig. 20 The light emitting device 100F according to the modification example 3-6 of the present disclosure shown includes a light emitting element 21F having a dome-shaped sealing material 29. The light emitting element 21F has a configuration substantially the same as that of the light emitting element 21D except that the shape of the sealing material 28 is different. Since the sealing material 29 in the light emitting element 21F has a dome shape, the sealing material 29 is allowed to have a lens effect. Therefore, the desired alignment performance can be easily obtained.

[0136] [3.7 Modification Example 3-7]

[0137] Although the display device 101 including the liquid crystal panel 122 has been described as an example in the above second embodiment, the present disclosure is not limited thereto. That is, although the light emitting device 100 is used as a backlight of the liquid crystal panel 122 in the display device 101, the light emitting device 100 may be used as a display panel.

[0138] Fig.21 A display device 201 including a display panel 200 is schematically shown. The display device 201 includes a display panel 210 and a control circuit 220 that controls the drive of the display panel 210. The display device 201 is a so-called LED display in which LEDs are used as display pixels. That is, the light source 2 of the light emitting device 100 is used as a display pixel. The display panel 210 is formed by overlapping a mounting plate 210A and an opposing plate 210B including the light emitting device 100 with each other. The opposing plate 210B has an image display surface on a front surface (a surface opposite to the mounting plate 210A), a display area at its central portion, and a frame area used as a non-display area around the display area. For example, the opposing plate 210B is arranged at a position opposite to the mounting plate 210A with a predetermined gap therebetween. It should be noted that the opposing plate 210B may be in contact with the upper surface of the mounting plate 210A. For example, the opposing plate 210B includes a light-transmitting substrate that transmits visible light. Examples of the light-transmitting substrate include a glass substrate, a transparent resin substrate, and a transparent resin film.

[0139] In addition, the effects described in this specification are only examples and are not limited to the description, and other effects can be obtained. For example, the light source of the present disclosure is not limited to any one of the white light source and the blue light source, and can be a light source that emits another color, such as a red light source or a green light source. In the light-emitting device of the present disclosure, white light can be generated using red light, green light, and blue light from three light sources including a red light source, a green light source, and a blue light source. More fine control of the amount of emitted light of each color makes it possible to reduce power consumption.

[0140] In addition, in the above-described light emitting device 100 and the like, a leaf spring is used as the elastic portion. However, the present disclosure is not limited thereto. For example, any other elastic member such as a coil spring may be used as the elastic portion.

[0141] In addition, in the above-mentioned light emitting device 100 and the like, the pressure contact terminal is interposed between the light source unit and the relay member. However, the present disclosure is not limited thereto. For example, Fig. 22 As shown, the light emitting device of the present disclosure can adopt a clip-type pressure contact terminal 50A. The pressure contact terminal 50A holds the light source unit 10 and the relay board 20 between a pair of elastic portions 52A and 52B. The pressure contact terminal 50A includes a conductive material. The elastic portion 52A is in pressure contact with the first terminal 11, and the elastic portion 52B is in pressure contact with the second terminal 12. Even in the case of using such a pressure contact terminal 50A, the elastic portions 52A and 52B can be brought into pressure contact with the first terminal 11 and the second terminal 12 by a mechanical bias force and the first terminal 11 and the second terminal 12 are electrically connected. Therefore, the pressure contact terminal 50A has the same effect as the pressure contact terminal 50 of the light emitting device 100 of the first embodiment described above.

[0142] Furthermore, in the above-described light emitting device 100 and the like, the flexible film 30 is bonded to the light emitting surface of each light source unit 10, and the plurality of light source units 10 are fixed to the flexible film 30. However, the flexible film 30 may be bonded to the rear surface of each light source unit 10 opposite to the light emitting surface.

[0143] Furthermore, in the above-mentioned light emitting device 100 etc., an example is given in which the extension direction of the light source board 1 of each light source unit 10 is perpendicular to the relative direction of the light source unit 10 and the relay board 20 relative to each other. However, the present disclosure is not limited to this. The extension direction of the light source board 1 and the relative direction of the light source unit 10 and the relay board 20 may intersect each other at an angle different from 90°. Similarly, in the above-mentioned light emitting device 100 etc., the rear chassis 60 and the light source unit 10 move relative to each other in the -X direction, so that the opening 1K and the hook 60K engage with each other. However, the present disclosure is not limited to this. Furthermore, the present technology may have the following configuration. (1)

[0145] A light emitting device, comprising:

[0146] A plurality of light source units, each light source unit comprising a light source board, a plurality of light sources and a first terminal, the light source board extending along a first direction, the plurality of light sources arranged on the light source board along the first direction, and the first terminal coupled to the plurality of light sources;

[0147] a relay member that is opposed to the plurality of light source units in a second direction intersecting the first direction and includes a plurality of second terminals each of which is electrically coupled to a corresponding one of the first terminals of the plurality of light source units; and

[0148] The pressure contact terminal is in pressure contact with at least one of the first terminal and the second terminal by a mechanical biasing force and electrically couples the first terminal and the second terminal. (2)

[0150] The light emitting device according to (1), wherein:

[0151] The pressure contact terminal includes an elastic portion having elasticity, and

[0152] The elastic portion is configured to bend along the second direction. (3)

[0154] The light emitting device according to (2), further comprising: a support body that supports the plurality of light source units and the relay member. (4)

[0156] The light emitting device according to (3) further includes: a control board which is disposed on the support body and controls driving of the plurality of light sources. (5)

[0158] The light emitting device according to (3) or (4), wherein:

[0159] The plurality of light source units respectively include a first joining portion,

[0160] The support body includes a plurality of second engaging portions, each of which engages with a corresponding one of the first engaging portions in the plurality of light source units,

[0161] The elastic portion extends along a third direction, and

[0162] The support body and the light source unit are relatively moved in the third direction, so that the first engaging portion is engaged with the second engaging portion. (6)

[0164] The light emitting device according to (5), wherein:

[0165] The plurality of light source units respectively include a first matching portion,

[0166] The support body includes a plurality of second matching portions, each of which matches with a corresponding one of the first matching portions in the plurality of light source units, and

[0167] The support body and the light source unit are relatively moved along the third direction, so that the second engaging portion is engaged with the first engaging portion at a position where the first engaging portion is engaged with the second engaging portion. (7)

[0169] The light emitting device according to (1), wherein:

[0170] The plurality of light source units respectively include a third joining portion, and

[0171] The relay member includes a plurality of fourth engaging portions, each of which engages with a corresponding one of the third engaging portions in the plurality of light source units. (8)

[0173] The light emitting device according to (3), wherein the plurality of light source units and the relay members are fixed to the support body by bonding, screwing, or fitting. (9)

[0175] The light emitting device according to (2), wherein the elastic portion of the pressure contact terminal includes a leaf spring or a coil spring. (10)

[0177] The light emitting device according to any one of (1) to (9), wherein the plurality of light source units are arranged to be spaced apart from each other along a second direction perpendicular to the first direction. (11)

[0179] The light emitting device according to (10), wherein a width of each of the plurality of light source units in the second direction is narrower than an interval between adjacent light source units of the plurality of light source units in the second direction. (12)

[0181] The light emitting device according to any one of (1) to (11), wherein the plurality of light sources include white light sources respectively, or the plurality of light sources include a red light source, a green light source, and a blue light source. (13)

[0183] The light emitting device according to any one of (1) to (11), further comprising: a wavelength conversion member, wherein:

[0184] The plurality of light sources includes a blue light source, and

[0185] The wavelength conversion member converts blue light from the blue light source into white light. (14)

[0187] The light emitting device according to (13), wherein the wavelength converting member includes quantum dots. (15)

[0189] A display device, comprising:

[0190] Light emitting device; and

[0191] A display panel displays an image using light from a light emitting device, wherein

[0192] The light emitting device comprises:

[0193] a plurality of light source units, each light source unit comprising a light source board, a plurality of light sources and a first terminal, the light source board extending along a first direction, the plurality of light sources arranged on the light source board along the first direction, and the first terminal coupled to the plurality of light sources,

[0194] a relay member that is opposed to the plurality of light source units in a second direction intersecting the first direction and includes a plurality of second terminals each of which is electrically coupled to a corresponding one of the first terminals of the plurality of light source units; and

[0195] The pressure contact terminal is in pressure contact with at least one of the first terminal and the second terminal by a mechanical biasing force and electrically couples the first terminal and the second terminal.

[0196] This application claims the benefit of Japanese Patent Application No. 2022-073701 filed with the Japan Patent Office on April 27, 2022, the entire contents of which are incorporated herein by reference.

[0197] It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and alterations may occur depending on design requirements and other factors insofar as they are within the scope of the appended claims or the equivalents thereof.

Claims

1. A light emitting device, comprising: A plurality of light source units, each light source unit comprising a light source board, a plurality of light sources and a first terminal, the light source board extending along a first direction, the plurality of light sources arranged on the light source board along the first direction, and the first terminal coupled to the plurality of light sources; a relay member that is opposite to the plurality of light source units in a second direction intersecting the first direction, and includes a plurality of second terminals, each second terminal being electrically coupled to a corresponding one of the first terminals of the plurality of light source units; as well as A pressure contact terminal is in pressure contact with at least one of the first terminal and the second terminal by a mechanical biasing force and electrically couples the first terminal and the second terminal.

2. The light emitting device according to claim 1, wherein: The pressure contact terminal includes an elastic portion exhibiting elasticity, and The elastic portion is configured to bend along the second direction.

3. The light emitting device according to claim 2, further comprising: A support body supports the plurality of light source units and the relay member.

4. The light emitting device according to claim 3, further comprising: The control board is arranged on the support body and controls the driving of the plurality of light sources.

5. The light emitting device according to claim 3, wherein: The plurality of light source units respectively include a first joining portion, The support body includes a plurality of second engaging portions, each of which engages with a corresponding one of the first engaging portions in the plurality of light source units. The elastic portion extends along a third direction, and The support body and the light source unit are relatively moved along the third direction, so that the first engaging portion is engaged with the second engaging portion.

6. The light emitting device according to claim 5, wherein: The plurality of light source units respectively include a first matching portion, The support body includes a plurality of second matching portions, each of which matches with a corresponding one of the first matching portions in the plurality of light source units, and The supporting body and the light source unit are relatively moved in the third direction, so that the second engaging portion is engaged with the first engaging portion at a position where the first engaging portion and the second engaging portion are engaged with each other.

7. The light emitting device according to claim 1, wherein: The plurality of light source units respectively include a third joining portion, and The relay member includes a plurality of fourth engaging portions, each of which engages with a corresponding one of the third engaging portions in the plurality of the light source units.

8. The light emitting device according to claim 3, wherein: The plurality of light source units and the relay members are fixed to the support body by bonding, screw fastening, or fitting.

9. The light emitting device according to claim 2, wherein: The elastic portion of the pressure contact terminal includes a leaf spring or a coil spring.

10. The light emitting device according to claim 1, wherein: The plurality of light source units are arranged to be spaced apart from each other along a second direction perpendicular to the first direction.

11. The light emitting device according to claim 10, wherein: A width of each of the plurality of light source units in the second direction is narrower than an interval between adjacent light source units in the plurality of light source units in the second direction.

12. The light emitting device according to claim 1, wherein: The plurality of light sources include white light sources respectively, or the plurality of light sources include a red light source, a green light source and a blue light source.

13. The light emitting device according to claim 1, further comprising: A wavelength conversion member, wherein The plurality of light sources include a blue light source, and The wavelength converting member converts blue light from the blue light source into white light.

14. The light emitting device according to claim 13, wherein: The wavelength converting member comprises quantum dots.

15. A display device, comprising: Light emitting device; as well as A display panel displays an image using light from the light emitting device, wherein: The light emitting device comprises: A plurality of light source units, each light source unit comprising a light source board, a plurality of light sources and a first terminal, the light source board extending along a first direction, the plurality of light sources arranged on the light source board along the first direction, and the first terminal coupled to the plurality of light sources; A relay component is opposite to the plurality of light source units in a second direction intersecting the first direction, and the relay component includes a plurality of second terminals, each second terminal being electrically coupled to a corresponding one of the first terminals of the plurality of light source units; and a pressure contact terminal, which is in pressure contact with at least one of the first terminal and the second terminal through a mechanical bias force and electrically couples the first terminal and the second terminal.

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