Linear light device

Abstract

The linear light-emitting device (2) of the present invention comprises: a substrate which is bent and stretched along a specified direction; a plurality of light-emitting elements which are arranged on the substrate along the specified direction; and a sealing material which seals the plurality of light-emitting elements; the brightness of a specific portion of the substrate is higher than the brightness of other portions of the substrate.

Description

Technical Field

[0001] The present disclosure relates to a linear light emitting device. Background Art

[0002] A display device having a transmissive display panel such as a liquid crystal panel device and a planar light emitting device as a light source disposed on the back of the display panel is known. Various technologies for making the brightness of an image displayed on the display panel uniform are known for display devices.

[0003] For example, Japanese Patent Gazette No. 6498258 (hereinafter referred to as Patent Document 1) describes a technology in which, in a planar light-emitting device, the brightness distribution of light incident on a light guide plate from a linear light-emitting portion is made uneven, thereby preventing the brightness of light emitted from the light guide plate to a display panel from becoming uneven.

[0004] In the technology described in Patent Document 1, the brightness distribution of light incident on the light guide plate from the linear light emitting device is made uneven by gradually changing the arrangement intervals of multiple light sources arranged in the linear light emitting portion, thereby making the brightness of light emitted from the light guide plate uniform. Summary of the invention

[0005] However, in the technology described in Patent Document 1, in order to gradually change the arrangement intervals of the plurality of light sources arranged in the linear light-emitting device, the arrangement intervals of the plurality of light sources are different from each other. In the technology described in Patent Document 1, since the arrangement intervals of the plurality of light sources are different from each other, the heat transferred from the adjacent light sources by the plurality of light sources is different from each other, resulting in different temperature-dependent light emission characteristics. In the technology described in Patent Document 1, since the light emission characteristics of the plurality of light sources are different from each other, there is a concern that light with uniform brightness cannot be emitted.

[0006] The present disclosure aims to provide a linear light emitting device capable of emitting light with more uniform brightness.

[0007] The linear light-emitting device disclosed herein comprises: a substrate that is bent and stretched along a specified direction; a plurality of light-emitting elements that are arranged on the substrate along the specified direction; and a sealing material that seals the plurality of light-emitting elements, wherein the brightness of a specific portion of the substrate is higher than that of other portions of the substrate.

[0008] In addition, the linear light-emitting device disclosed in the present invention comprises: a substrate, which is bent and stretched along a prescribed direction and has a mounting area extending along the prescribed direction; a plurality of light-emitting elements, which are arranged on the mounting area along the prescribed direction; and a sealing material, which seals the plurality of light-emitting elements, and in the central part of the mounting area, the brightness directly above each of the plurality of light-emitting elements is the same as the brightness in the middle of the plurality of light-emitting elements.

[0009] Furthermore, in the linear light-emitting device, it is preferred that a plurality of light-emitting elements are arranged in one or more columns along a specified direction in the central portion of the mounting area, and are arranged in a greater number of columns along a specified direction in an area near the end of the mounting area than in the central portion.

[0010] Furthermore, in the linear light emitting device, it is preferable that the mounting region has substantially the same shape even if the number of arrays of the plurality of light emitting elements is changed.

[0011] Furthermore, in the linear light emitting device, the mounting region preferably includes: a first mounting region extending in a predetermined direction; and a second mounting region extending in the predetermined direction and arranged adjacent to the first mounting region in the predetermined direction.

[0012] Furthermore, in the linear light emitting device, it is preferable that the mounting region is not formed in a power supply portion that supplies power to the plurality of light emitting elements.

[0013] Furthermore, in the linear light-emitting device, it is preferred that the plurality of light-emitting elements are arranged in a region away from the end of the linear light-emitting portion so that the optical axis is consistent with the optical axis of the light guide plate, and are arranged in a region close to the end of the linear light-emitting portion so that the optical axis deviates from the optical axis of the light guide plate in the height direction of the incident surface.

[0014] Furthermore, in the linear light emitting device, the plurality of light emitting elements are preferably arranged at uniform intervals along a predetermined direction.

[0015] Furthermore, in the linear light-emitting device, it is preferred that the plurality of light-emitting elements are uniformly arranged at a first arrangement pitch along a prescribed direction in a region away from the end of the linear light-emitting portion, and are uniformly arranged at a second wiring pitch narrower than the first arrangement pitch along a prescribed direction in a region close to the end of the linear light-emitting portion.

[0016] Furthermore, the linear light emitting device preferably further includes a member for suppressing warping of the substrate.

[0017] Furthermore, the linear light emitting device preferably further includes a housing for controlling light from the light emitting element.

[0018] The linear light-emitting device disclosed above can emit light with more uniform brightness. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a perspective view of a planar light-emitting device according to an embodiment.

[0020] Figure 2 for Figure 1 An exploded perspective view of an embodiment of a planar light-emitting device is shown.

[0021] Figure 3 for Figure 1 A perspective top view of the surface lighting device is shown.

[0022] Figure 4 for Figure 1 An enlarged top view of the linear light-emitting portion shown.

[0023] Figure 5 (a) is along Figure 1 The cross-sectional view along the line AA' is shown, and (b) is a partial enlarged view of the portion indicated by the dotted line 11 in (a).

[0024] Figure 6 It is a partial top view showing the linear light-emitting portion of the first variant.

[0025] Figure 7 (a) is a partial top view of the linear light-emitting portion of the second variant, (b) is a partial top view of the linear light-emitting portion of the third variant, and (c) is a partial top view of the linear light-emitting portion of the fourth variant.

[0026] Figure 8 (a) is a diagram showing an example of light emitted from a light emitting element configured in such a manner that the optical axis is consistent with the optical axis of the light guide plate, (b) is a diagram showing an example of light emitted from a light emitting element configured in such a manner that the optical axis is located below the optical axis of the light guide plate, and (c) is a diagram showing an example of light emitted from a light emitting element configured in such a manner that the optical axis is located above the optical axis of the light guide plate.

[0027] Fig. 9 It is a perspective top view of a planar light-emitting device having a linear light-emitting portion according to the fifth variation.

[0028] Fig.10 This is an enlarged top view of the linear light-emitting portion of the fifth variant.

[0029] Fig.11 It is a perspective top view of a planar light-emitting device having a linear light-emitting portion according to the sixth variant.

[0030] Fig.12 This is an enlarged top view of the linear light-emitting portion of the 6th variant.

[0031] Fig.13 It is a perspective top view of a planar light-emitting device having a linear light-emitting portion according to the seventh variant.

[0032] Fig.14 This is an enlarged top view of the linear light-emitting portion of the 7th variant.

[0033] Fig.15 This is an enlarged top view of the linear light-emitting portion of the 8th variant.

[0034] Fig.16This is an enlarged top view of the linear light-emitting portion of the 9th variant.

[0035] Fig.17 The figures are diagrams showing optical simulation results of the surface light-emitting device of the embodiment, the surface light-emitting device of the variant example and the surface light-emitting device of the comparative example, (a) shows the optical simulation results of the surface light-emitting device of the embodiment, (b) shows the optical simulation results of the surface light-emitting device equipped with the linear light-emitting portion of the second variant example, (c) shows the optical simulation results of the surface light-emitting device equipped with the linear light-emitting portion of the third variant example, (d) shows the optical simulation results of the surface light-emitting device equipped with the linear light-emitting portion of the fourth variant example, (e) shows the optical simulation results of the surface light-emitting device of the sixth variant example, (f) shows the optical simulation results of the surface light-emitting device of the seventh variant example, and (g) shows the optical simulation results of the surface light-emitting device of the comparative example.

[0036] Fig.18 The figures are figures showing the measurement results of the brightness distribution of a backlight using a plurality of SMDs arranged in a straight line as the light source and a backlight using the linear light-emitting portion disclosed in the present invention as the light source, (a) is an image showing the brightness distribution of the backlight using the SMDs as the light source, (b) is a graph showing the brightness distribution of the backlight using the SMDs as the light source, (c) is an image showing the brightness distribution of the backlight using the linear light-emitting portion disclosed in the present invention as the light source, and (d) is a graph showing the brightness distribution of the backlight using the linear light-emitting portion disclosed in the present invention as the light source.

[0037] Fig.19 It is a diagram showing the relationship between the element arrangement and the radiation intensity of the linear light emitting portion according to the embodiment. DETAILED DESCRIPTION

[0038] Hereinafter, a preferred embodiment of the linear light emitting device and the planar light emitting device disclosed in the present invention will be described with reference to the accompanying drawings. However, the technical scope of the present invention is not limited to these embodiments, but covers the inventions described in the claims and their equivalents.

[0039] In this specification, the following description is given by taking a planar light emitting device used as a light source for illuminating a transmissive display panel such as a liquid crystal panel from the back as an example, but the uses of the linear light emitting device and the planar light emitting device disclosed in this specification are not limited to this. For example, the planar light emitting device disclosed in this specification can also be used as a light source for an illumination device or an information display device.

[0040] In addition, in this specification, as a general term for symbols composed of a combination of numbers and letters, letters may be omitted and only numbers may be used as a general term. For example, the connector 22 is a general term for the anode terminal 22a and the cathode terminal 22b.

[0041] Figure 1is a perspective view of a planar light-emitting device according to an embodiment, Figure 2 for Figure 1 An exploded perspective view of an embodiment of a planar light-emitting device is shown. Figure 3 for Figure 1 A perspective top view of the surface lighting device shown, Figure 4 for Figure 1 An enlarged top view of the linear light-emitting portion shown. Figure 5 (a) is along Figure 1 The cross-sectional view of the line AA' is shown. Figure 5 (b) Figure 5 A partial enlarged view of the portion indicated by the dotted line 11 in (a). Figure 5 In FIG. 1 , the dotted arrow represents an example of the optical path of light emitted from the linear light emitting portion.

[0042] The planar light emitting device 1 of the embodiment includes a linear light emitting unit 2, a light guide plate 3, a reflective sheet 4, an optical sheet 5, a housing 6, and a spacer 7. The planar light emitting device 1 has a flat rectangular parallelepiped shape extending in a predetermined direction, and emits light with uniform brightness from a light emitting surface 10 .

[0043] The linear light emitting portion 2 has an elongated rectangular shape extending in the longitudinal direction of the planar light emitting device 1, and is a linear light emitting device that emits linear light in the longitudinal direction of the planar light emitting device 1. The linear light emitting portion 2 has a substrate 20 having a mounting substrate 20a and a circuit substrate 20b; a connector 22 connected to a cable 23; a plurality of light emitting elements 24; a line 25; a frame 26; and a sealing material 27. The connector 22, the plurality of light emitting elements 24, the sealing material 27, and the frame 26 are arranged in order in the longitudinal direction of the linear light emitting portion 2.

[0044] The linear light emitting portion 2 is fixed to the side portion of the lower housing 6b in the longitudinal direction by means of an adhesive material in such a manner that the longitudinal direction is consistent with the longitudinal direction of the lower housing 6b. The adhesive material for bonding the linear light emitting portion 2 preferably has high thermal conductivity, and for example, may be arranged only in the central portion of the linear light emitting portion 2, and not across the entire longitudinal direction of the linear light emitting portion 2.

[0045] The mounting substrate 20a has a shape of an elongated rectangle extending in a predetermined direction. The length direction of the mounting substrate 20a coincides with the length direction of the linear light emitting portion 2, and the width direction of the mounting substrate 20a coincides with the width direction of the linear light emitting portion 2. The mounting substrate 20a is formed of a material having high thermal conductivity, such as a metal such as aluminum or a ceramic. The mounting substrate 20a has a flat surface, and a plurality of light emitting elements 24 are arranged on the flat surface.

[0046] The circuit substrate 20b is arranged on the mounting substrate 20a. The length direction of the circuit substrate 20b is consistent with the length direction of the linear light-emitting portion 2, and the width direction of the circuit substrate 20b is consistent with the width direction of the linear light-emitting portion 2. The circuit substrate 20b is formed with a pair of elongated openings in the central portion, and the regions corresponding to the pair of openings of the circuit substrate 20b extend along the length direction of the substrate 20, and are the first mounting area 21a and the second mounting area 21b for mounting the light-emitting element 24. The first mounting area 21a and the second mounting area 21b are arranged adjacent to each other in the length direction. The circuit substrate 20b is attached to the mounting substrate 20a by means of an adhesive material such as an adhesive sheet. The circuit substrate 20b is formed using an electrically insulating resin such as a phenol resin, an epoxy resin, a polyimide resin, or a polyester resin.

[0047] On the surface of the circuit substrate 20b, a circuit 25 including an anode circuit 25a and a cathode circuit 25b is arranged on the outside along the longitudinal direction of the first mounting area 21a and the second mounting area 21b. The anode circuit 25a and the cathode circuit 25b are arranged in a manner extending in the longitudinal direction of the circuit substrate 20b with a gap in the width direction of the circuit substrate 20b. The anode circuit 25a and the cathode circuit 25b are formed by, for example, forming a pattern of a conductor such as gold or copper on the circuit substrate 20b. Since the substrate 20 of the linear light emitting portion 2 has an elongated rectangular shape extending in the longitudinal direction of the planar light emitting device 1, it is easy to bend in the longitudinal direction, and the planar light emitting device 1 is easy to warp in the longitudinal direction due to the heat generated by the light emitting element 24 and the difference in thermal expansion coefficient between the mounting substrate 20a and the circuit substrate 20b. The anode circuit 25a and the cathode circuit 25b have heat dissipation properties and rigidity, so the warping can be suppressed. When the opening is sandwiched, the heat source is surrounded, so it is easy to obtain the heat dissipation effect, and the rigidity can be ensured on both sides of the heat source, so the warping can be further suppressed. In addition, the thickness of the circuit raw material is usually 18μm, but it can also be less than 35μm, less than 70μm, or less than 105μm.

[0048] The anode line 25a and the cathode line 25b are electrically connected to the connector 22 at the end of the substrate 20. The connector 22 includes an anode terminal 22a and a cathode terminal 22b, and is a power supply unit that supplies power to the light-emitting element 24 via the anode line 25a and the cathode line 25b. The anode line 25a is electrically connected to the anode terminal 22a, and the cathode line 25b is electrically connected to the cathode terminal 22b. The anode terminal 22a and the cathode terminal 22b are connected to a cable 23 that is supplied with power from an external power source not shown in the figure via a conductive bonding member such as solder. The cable 23 is, for example, an electric wire such as a CV cable that can supply power. The anode line 25a and the cathode line 25b are electrically connected via a Zener diode not shown in the figure to prevent overvoltage from being applied to the plurality of light-emitting elements 24.

[0049] The light emitting element 24 is, for example, a blue LED (Light Emitting Diode) crystal. As the light emitting element 24, for example, an InGaN compound semiconductor having a light emitting wavelength of 440 to 455 nm can be used. The light emitting element 24 is preferably arranged in a manner such that the upper surface is parallel to the surface of the mounting substrate 20a. The light emitting element 24 is bonded to the mounting substrate 20a, for example, by die bonding. The rectangular light emitting element 24 is arranged on the mounting substrate 20a so that the sides are opposite to each other, but the light emitting element 24 can also be rotated 45 degrees and arranged on the mounting substrate 20a so that the vertices are opposite to each other.

[0050] By directly arranging the light emitting element 24 on the mounting substrate 20a having high thermal conductivity, the heat generated by the light emitting element 24 can be efficiently transferred to the mounting substrate 20a, thereby suppressing the temperature rise of the light emitting element 24. Thus, from the viewpoint of arranging the light emitting element 24 on the mounting substrate 20a at a high density, it is also preferable that the linear light emitting portion 2 has high heat dissipation of the light emitting element 24.

[0051] Each light emitting element 24 has a cathode and an anode, and eight light emitting elements 24 are connected in series between the anode line 25a and the cathode line 25b via a wire 28 to form a plurality of light emitting element columns. In one example, the linear light emitting portion 2 is formed with 26 light emitting element columns, and a total of 208 light emitting elements are mounted on the substrate 20. The number of light emitting elements 24 included in the light emitting element column is determined according to the output voltage of the driving circuit, and the number of columns arranged in the linear light emitting portion 2 is determined according to the brightness of the light emitted by the planar light emitting device 1.

[0052] When a direct current voltage is applied from an external power source to the anode line 25a and the cathode line 25b via the cable 23 and the anode terminal 22a and the cathode terminal 22b, the light emitting elements 24 emit light simultaneously.

[0053] The light emitting elements 24 are arranged in one row in the central portion 201 of the first mounting region 21a and the second mounting region 21b along the length direction of the substrate 20, and are arranged in two rows in the end portions 202 and 203 of the first mounting region 21a and the second mounting region 21b along the length direction of the substrate 20. Furthermore, even if the number of arrangement of the light emitting elements 24 is changed, the first mounting region 21a and the second mounting region 21b have substantially the same shape. That is, in the first mounting region 21a and the second mounting region 21b, the planar shape of the central portion 201 where the light emitting elements 24 are arranged in one row is substantially the same as the planar shape of the end portions 202 and 203 where the light emitting elements 24 are arranged in two rows.

[0054] The light emitting elements 24 are arranged at uniform arrangement intervals D1 along the longitudinal direction of the substrate 20 in the central portion 201 and the end portions 202 and 203 of the first mounting region 21 a and the second mounting region 21 b .

[0055] The frame 26 is also called a barrier material, and is arranged to surround the first mounting area 21a and the second mounting area 21b on which the light emitting element 24 is mounted. The length direction of the frame 26 coincides with the length direction of the linear light emitting portion 2. The width direction of the frame 26 coincides with the width direction of the linear light emitting portion 2. The frame 26 has an annular shape extending along the length direction of the linear light emitting portion 2.

[0056] The frame 26 is formed by arranging a long frame continuum of approximately the same width into a ring shape. The frame continuum is preferably formed of a white resin. For example, a silicone resin or an epoxy resin in which particles such as titanium oxide are dispersed is used to form the frame continuum. The light emitted from the light emitting element 24 toward the frame 26 is reflected on the inner side of the frame 26, that is, the surface on the side of the light emitting element 24, and is emitted above the linear light emitting portion 2. Furthermore, when the sealing material 27 is formed of a resin with high thixotropy, the frame 26 can also be omitted.

[0057] The sealing material 27 is filled in the first mounting area 21a and the second mounting area 21b surrounded by the frame 26, and seals the light emitting elements 24 mounted in the first mounting area 21a and the second mounting area 21b and the wires 28 for electrically connecting the light emitting elements 24. The sealing material 27 is a member containing a phosphor in a resin that is translucent to the light generated by the plurality of light emitting elements 24. The light generated by the plurality of light emitting elements 24 includes the light emitted by the light emitting elements 24 and the light after the wavelength is converted by the phosphor. The phosphor is a granular phosphor material such as YAG (Yttrium Aluminum Garnet) that absorbs the blue light emitted by the light emitting element 24 and converts the wavelength into yellow light. The blue light is mixed with the yellow light after the wavelength is converted by the phosphor, thereby obtaining white light. For example, the sealing material 27 can be formed by containing a phosphor in a resin such as epoxy resin or silicone resin. The sealing material 27 can also have a phosphor that absorbs blue light and converts the wavelength into light of other colors (red, green, etc.). In addition, the sealing material 27 may not contain a phosphor.

[0058] The light guide plate 3 has an incident surface 31 for receiving light emitted by the planar light emitting unit 2, an exit surface 32 for emitting light incident from the incident surface 31, and a protrusion 33, and has a flat rectangular parallelepiped shape extending in the length direction of the planar light emitting device 1. The light guide plate 3 guides the light incident from the incident surface 31 while changing its traveling direction so that the light is emitted from the exit surface 32 having a direction orthogonal to the incident surface 31.

[0059] The light guide plate 3 is formed of a material that transmits the light emitted by the linear light emitting portion 2. For example, the light guide plate 3 is formed of a resin such as a polycarbonate resin or an acrylic resin. In addition, since the light guide plate 3 receives high-brightness light from the linear light emitting portion 2, it can also be formed of a material with high light resistance. As a material with high light resistance, for example, glass can be used. The light guide plate 3 is housed in the lower housing 6b in such a way that the optical axis of the incident surface 31 coincides with the optical axis of the light emitting element 24 installed in the linear light emitting portion 2.

[0060] In addition, a fine concave-convex structure is formed on the side of the light guide plate 3 opposite to the exit surface 32 and in contact with the reflector 4, and the light incident on the side opposite to the exit surface 32 is reflected toward the exit surface 32 by the concave-convex structure and emitted from the exit surface 32.

[0061] The protrusions 33 are arranged on both sides and the center of the incident surface 31 in the length direction, and abut against abutment areas 331 to 333 on the surface of the linear light-emitting portion 2 when the linear light-emitting portion 2 is bent due to heat generated by light emission, etc., thereby preventing the linear light-emitting portion 2 from leaving the side surface in the length direction of the lower housing 6b. The abutment area 331 is the surface of one end of the substrate 20, the abutment area 332 is the surface of the other end of the substrate 20, and the abutment area 333 is the surface of the center of the substrate 20. The first mounting area 21a and the second mounting area 21b are not formed on the surface of the linear light-emitting portion 2 that the protrusions 33 abut against, and the first mounting area 21a and the second mounting area 21b are formed on the surface of the linear light-emitting portion 2 that the protrusions 33 do not abut against.

[0062] Furthermore, the shape of the light guide plate 3 is not limited to a rectangle extending in the longitudinal direction. The shape of the light guide plate 3 can be determined according to the surface shape of the light emitted by the device in which the planar light emitting device 1 is installed. For example, the shape of the light guide plate 3 can also be a square, a polygon other than a quadrangle, or an ellipse. In addition, for example, when the planar light emitting device 1 is used as a light source of an illumination device, the shape of the light guide plate 3 can also be a circular, elliptical, polygonal, or other shapes.

[0063] The reflection sheet 4 reflects light emitted from the side of the light guide plate 3 opposite to the emission surface 32 toward the light guide plate 3. The reflection sheet 4 may be made of, for example, a metal plate, film, foil, a film with a silver vapor-deposited film, a film with an aluminum vapor-deposited film, or a white sheet having a light-reflecting function.

[0064] The optical sheet 5 includes, for example, a diffuser, a focusing sheet, and a reflective polarizer. The diffuser is formed by dispersing silica particles in a resin such as polycarbonate resin or acrylic resin, and diffuses and transmits the light emitted from the exit surface 32 of the light guide plate 3. The focusing sheet is, for example, a prism sheet having a tiny focusing group formed on the side opposite to the reflective polarizer, and adjusts the light distribution of the light incident from the diffuser to emit toward the reflective polarizer. The reflective polarizer has, for example, a multilayer film structure formed of resin, which allows one of the S component and the P component of the light incident from the focusing sheet to pass through and reflects the other component. The light of the component reflected by the focusing sheet travels toward the reflective sheet side, and is then converted into light of the component that will pass through the reflective polarizer before it is incident on the reflective polarizer again.

[0065] Furthermore, the sheet materials included in the optical sheet 5 arranged on the light guide plate 3 are not limited to the above examples. For example, when the planar light-emitting device 1 is used as a light source for a general lighting device, the first diffusion sheet and the second diffusion sheet may be arranged in sequence on the light guide plate 3. In addition, when the planar light-emitting device 1 is used as a light source for a large display device, the first diffusion sheet, the second diffusion sheet, and the condenser sheet may be arranged in sequence on the light guide plate 3. In addition, when the planar light-emitting device 1 is used as a light source for a large, medium, or small display device, the diffusion sheet and the condenser sheet may be arranged in sequence on the light guide plate 3. In addition, when the planar light-emitting device 1 is used as a light source for a small display device, the diffusion sheet, the first condenser sheet, and the second condenser sheet may be arranged in sequence on the light guide plate 3.

[0066] The housing 6 includes an upper housing 6a and a lower housing 6b. The upper housing 6a is a frame-shaped member having a rectangular opening 61, and the lower housing 6b is a box-shaped member having an opening 62 formed on the bottom surface for the cable to pass through. The upper housing 6a and the lower housing 6b have a rectangular planar shape, and house the linear light emitting unit 2, the light guide plate 3, the reflective sheet 4, and the optical sheet 5. The housing 6 houses the linear light emitting unit 2 and the light guide plate 3 in such a manner that the light emitting area of ​​the linear light emitting unit 2 is opposite to the incident surface of the light guide plate 3. The optical sheet 5 is exposed from the opening 61 of the upper housing 6a, and the light emitted from the linear light emitting unit 2 is uniformly emitted in a planar shape from the light emitting surface 10 corresponding to the opening 61 to the outside of the planar light emitting device 1.

[0067] Next, the operation of the planar light-emitting device 1 according to the present embodiment described above will be described below.

[0068] like Figure 5 As shown in FIG. 2( a ), as external power is supplied to the cable 23 , the light emitting element 24 of the linear light emitting unit 2 emits light. The linear light emitted from the linear light emitting unit 2 enters the incident surface 31 of the light guide plate 3 .

[0069] Most of the light emitted from the linear light emitting portion 2 is incident on the incident surface 31 of the light guide plate 3, and part of the light emitted from the linear light emitting portion 2 is reflected by the frame 26 and is incident on the incident surface 31 of the light guide plate 3. The relationship between the position of the surface of the sealing material 27 and the height of the frame 26 can be designed as appropriate according to the size of the linear light emitting portion 2 or the positional relationship between the linear light emitting portion 2 and the light guide plate 3. In addition, by further increasing the height of the frame 26 within the design allowable range of the planar light emitting device 1 and making the distance between the frame 26 and the incident surface 31 of the light guide plate 3 closer, the light emitted from the linear light emitting portion 2 will be efficiently incident on the incident surface 31 of the light guide plate 3. The light incident on the incident surface 31 of the light guide plate 3 is reflected by the reflective sheet 4 and the like and is emitted from the exit surface 32 to the optical sheet. The light emitted in a planar manner from the exit surface 32 of the light guide plate 3 is emitted to the outside of the planar light emitting device 1 through the optical sheet 5.

[0070] Since the planar light emitting device 1 includes a linear light emitting portion in which a plurality of light emitting elements are mounted at a high density, it is possible to emit planar light with high brightness.

[0071] Furthermore, in the planar light-emitting device 1, the light-emitting elements 24 are arranged in one row at the center of the first mounting area 21a and the second mounting area 21b along the length direction of the substrate 20, and are arranged in two rows at the ends of the first mounting area 21a and the second mounting area 21b along the length direction of the substrate 20. Since the light-emitting elements 24 are arranged in two rows at the ends of the first mounting area 21a and the second mounting area 21b where the brightness is reduced due to interference with the protrusion 33 of the light guide plate 3, it is possible to compensate for the brightness reduction caused by the protrusion 33 and emit light with more uniform brightness.

[0072] The linear light-emitting portion of the embodiment may be formed so that only a specific part of the light-emitting area becomes brighter by setting a brightness difference in the light-emitting area, or may be formed so that only a specific part of the light-emitting area becomes darker. In this embodiment, the linear light-emitting portion 2 arranges the light-emitting elements 24 in two rows at the ends 202 and 203 of the first mounting area 21a and the second mounting area 21b at positions opposite to the dark part of the light guide plate, thereby forming a position where only the surrounding area of ​​the position opposite to the dark part of the light guide plate becomes brighter. In addition, the linear light-emitting portion of the embodiment may not be configured with the light-emitting element 24 in the corresponding mounting area, thereby forming a specific part of the light-emitting area becomes darker.

[0073] In addition, in the present embodiment, since the linear light emitting portion 2 is filled with the sealing material 27 in the first mounting area 21a and the second mounting area 21b where the light emitting element 24 is mounted, the light emitted from the light emitting element 24 is diffused around the light emitting element 24 by the sealing material 27. The light emitted from the light emitting element 24 is diffused around the light emitting element 24 so that the brightness of the middle position of the light emitting element 24 is the same as the brightness just above the light emitting element 24. In addition, in the linear light emitting portion of the embodiment, the light emitting element 24 can be mounted in a manner that the brightness of a specific part of the light emitting area is higher than the brightness of other parts of the light emitting area, and the light emitting element 24 can be mounted in a manner that the brightness of the specific part of the light emitting area is lower than the brightness of other parts of the light emitting area. Here, the brightness of the two parts of the light emitting area is the same, which means that the brightness of the darker part is more than 90% of the brightness of the brighter part. In addition, the brightness of the specific part of the light emitting area is lower than the brightness of other parts, which means that the brightness of the darker part is less than 90% of the brightness of the brighter part.

[0074] In the central portion 201 of the first mounting area 21a and the second mounting area 21b, the light emitting elements 24 are arranged at intervals such that the brightness of the middle position between the light emitting elements 24 is the same as the brightness directly above the light emitting elements 24, thereby making it possible to inject uniform light onto the incident surface 31 of the opposite light guide plate 3. In addition, in the linear light emitting portion of the embodiment, by not mounting the light emitting element in the mounting area corresponding to the specific portion of the light emitting area, the brightness of the specific portion of the light emitting area can be made lower than the brightness of other portions of the light emitting area.

[0075] In the linear light emitting portion of the embodiment, the number and mounting interval of the light emitting elements 24 arranged in two rows at the ends 202 and 203 of the first mounting area 21a and the second mounting area 21b can be adjusted so that the light emitted from the light guide plate becomes uniform over the entire surface. For example, the number and mounting interval of the light emitting elements 24 so that the light emitted from the light guide plate becomes uniform over the entire surface can be determined by optical simulation.

[0076] Since the frame 26 can be made into the same shape regardless of the number of light emitting elements arranged, it is not necessary to change the wiring of the circuit board and the shape of the housing 6. In addition, even if the number of light emitting elements arranged increases, the emitted light from the light emitting elements will be reflected by the frame 26, so the so-called lateral light leakage will not increase, and the shape of the light emitting area and the frame 26 is substantially the same.

[0077] The planar light-emitting device 1 is an example of the planar light-emitting device disclosed in the present invention, and various modifications are possible. For example, in the planar light-emitting device 1, the light-emitting elements 24 are arranged in two rows at the ends of the first mounting area 21a and the second mounting area 21b, but in the planar light-emitting device of the embodiment, the light-emitting elements 24 can also be arranged in a manner of changing to three or more rows at the ends of the mounting areas. In addition, at the ends 202 and 203, four light-emitting elements 24 are arranged in two rows along the length direction of the substrate 20, but in the planar light-emitting device of the embodiment, the number of light-emitting elements 24 arranged in two rows can be changed as appropriate so that the brightness of the light emitted from the light-emitting surface 10 becomes uniform.

[0078] Figure 6 It is a partial top view showing the linear light-emitting portion of the first variant.

[0079] The linear light emitting portion 2' of the first modified example is different from the linear light emitting portion 2 in the number of light emitting elements 24 arranged along the width direction of the first mounting area 21a and the second mounting area 21b. The configuration and function of the components of the linear light emitting portion 2' other than the number of light emitting elements 24 arranged along the width direction of the first mounting area 21a and the second mounting area 21b are the same as those of the linear light emitting portion 2 with the same reference numerals, and therefore detailed description thereof is omitted here.

[0080] In the linear light emitting portion 2' of the first variant, the light emitting elements 24 are arranged in two rows along the width direction in the central portion of each of the first mounting area 21a and the second mounting area 21b. In addition, in the linear light emitting portion 2' of the first variant, the light emitting elements 24 are arranged in three rows along the width direction in the region near the end of each of the first mounting area 21a and the second mounting area 21b. In the linear light emitting portion of the embodiment, the light emitting elements 24 are arranged in one or more rows along the length direction in the central portion of the mounting area, and are arranged in a greater number of rows along the length direction in the region near the end of the mounting area than in the central portion.

[0081] In addition, in the planar light-emitting device 1, the light-emitting elements 24 are arranged in two rows at the ends 202 and 203 of the first mounting area 21a and the second mounting area 21b. However, in the planar light-emitting device of the embodiment, the light-emitting elements 24 only need to be arranged in two rows along the predetermined direction in the area 331 to 333 close to the area 331 to 333 where the protrusion 33 abuts. The area 331 to 333 close to the area 331 to 333 where the protrusion 33 abuts is an area where the brightness of the end of the incident surface side of the light-emitting surface of the light guide plate 3 is less than about 80% of the brightness of the central part of the light-emitting surface of the light guide plate 3. In addition, the area far from the area 331 to 333 where the protrusion 33 abuts is an area where the brightness of the end of the incident surface side of the light-emitting surface of the light guide plate 3 is more than about 80% of the brightness of the central part of the light-emitting surface of the light guide plate 3.

[0082] In addition, in the planar light-emitting device 1, the linear light-emitting portion 2 has the light-emitting elements 24 installed in two mounting areas, namely the first mounting area 21a and the second mounting area 21b. However, in the planar light-emitting device of the embodiment, the light-emitting elements 24 may be installed in a single mounting area or in more than three mounting areas.

[0083] Furthermore, in the linear light-emitting portion, when light-emitting elements 24 are installed in more than three mounting areas, the light-emitting elements 24 are arranged in one row along the length direction at the center of each mounting area, and in two rows along the length direction at the end of each mounting area.

[0084] In addition, the surface light-emitting device 1 improves the brightness of light emitted from the end of the mounting area by arranging the light-emitting elements 24 in two rows at the end of the mounting area, but in the surface light-emitting device of the embodiment, the brightness of light emitted from the end of the mounting area can also be improved by other structures.

[0085] Figure 7 (a) is a partial top view showing a linear light emitting portion of the second modified example, Figure 7 (b) is a partial top view showing the linear light-emitting portion of the third variant. Figure 7 (c) is a partial top view of the linear light-emitting portion of the fourth variant. Figure 8 (a) is a diagram showing an example of light emitted from a light emitting element arranged so that the optical axis coincides with the optical axis of a light guide plate. Figure 8 (b) is a diagram showing an example of light emitted from a light emitting element arranged so that the optical axis is located below the optical axis of the light guide plate. Figure 8 (c) is a diagram showing an example of light emitted from a light emitting element arranged so that the optical axis is located above the optical axis of the light guide plate.

[0086] The linear light emitting unit 101 of the second modified example is different from the linear light emitting unit 2 in the arrangement shape of the light emitting elements 24 arranged in the first mounting area 21a and the second mounting area 21b. The configuration and function of the components of the linear light emitting unit 101 other than the arrangement shape of the light emitting elements 24 are the same as the configuration and function of the components of the linear light emitting unit 2 with the same reference numerals, so detailed description is omitted here.

[0087] Like the central portion 201 of the first mounting region 21a and the second mounting region 21b of the linear light emitting portion 2, the light emitting elements 24 are arranged at a uniform arrangement interval D1 in the central portion 301 of the first mounting region 21a and the second mounting region 21b along the longitudinal direction of the substrate 20.

[0088] The light emitting elements 24 are arranged along the longitudinal direction of the substrate 20 at the ends 302 and 303 of the first mounting region 21 a and the second mounting region 21 b at a uniform arrangement interval D2 that is narrower than the arrangement interval D1 in the central portion 201 .

[0089] Since the linear light emitting portion 101 arranges the light emitting elements 24 at the ends 302 and 303 at a uniform arrangement interval D2 that is narrower than the arrangement interval D1 at the center portion 201 , the brightness of the light emitted from the ends 302 and 303 can be made higher than the brightness of the light emitted from the center portion 301 .

[0090] The linear light emitting unit 102 of the third modified example is different from the linear light emitting unit 2 in the arrangement shape of the light emitting elements 24 arranged in the first mounting area 21a and the second mounting area 21b. The configuration and function of the components of the linear light emitting unit 102 other than the arrangement shape of the light emitting elements 24 are the same as those of the components of the linear light emitting unit 2 with the same reference numerals, and therefore detailed description thereof will be omitted here.

[0091] As with the central portion 201 of the first mounting region 21a and the second mounting region 21b of the linear light emitting portion 2, the light emitting elements 24 are arranged at a uniform arrangement interval D1 in the central portion 401 of the first mounting region 21a and the second mounting region 21b along the length direction of the substrate 20. In addition, the optical axis of the light emitting element 24 arranged in the central portion 401 of the first mounting region 21a and the second mounting region 21b is arranged to coincide with the optical axis of the light guide plate 3 indicated by the single-dot chain line L. The height of the optical axis of the light guide plate 3 coincides with, for example, the center of the height direction of the incident surface 31 of the light guide plate 3.

[0092] As with the central portion 401, the light emitting elements 24 are arranged at the end portions 402 and 403 of the first mounting region 21a and the second mounting region 21b at an arrangement interval D1 along the length direction of the substrate 20. However, the light emitting elements 24 arranged at the end portions 402 and 403 of the first mounting region 21a and the second mounting region 21b are arranged in such a manner that the optical axes are located at positions farther from the emission surface 32 than the optical axis of the light guide plate 3, that is, at positions closer to the bottom surface of the lower housing 6b.

[0093] Since the light emitting element 24 is arranged at the ends 402 and 403 of the linear light emitting portion 102 so that the optical axis is located at a position far from the exit surface 32, among the light emitted from the ends 402 and 403, more light is reflected at a position of the reflector 4 closer to the linear light emitting portion 102, so that more light is emitted from the exit surface 32 of the light guide plate 3 at a position closer to the linear light emitting portion 102. Figure 8 As shown in (b), in the linear light emitting portion 102, light emitted from the light emitting element 24 whose optical axis is located below the optical axis of the light guide plate is emitted from the emission surface 32 at a position close to the linear light emitting portion 102. Figure 8 As shown in (b), the light emitting elements 24 arranged at the ends 402 and 403 can make the brightness of the light emitted from the emission surface 32 near the protrusion 33 of the light guide plate 3 approximately equal to the brightness of the light emitted from the emission surface 32 away from the protrusion 33.

[0094] The linear light emitting unit 103 of the fourth modified example is different from the linear light emitting unit 2 in the arrangement shape of the light emitting elements 24 arranged in the first mounting area 21a and the second mounting area 21b. The configuration and function of the components of the linear light emitting unit 103 other than the arrangement shape of the light emitting elements 24 are the same as those of the components of the linear light emitting unit 2 with the same reference numerals, and therefore detailed description thereof will be omitted here.

[0095] As with the central portion 201 of the first mounting region 21a and the second mounting region 21b of the linear light-emitting portion 2, the light-emitting elements 24 are arranged at a uniform arrangement interval D1 in the central portion 501 of the first mounting region 21a and the second mounting region 21b along the length direction of the substrate 20. In addition, the optical axis of the light-emitting element 24 arranged in the central portion 501 of the first mounting region 21a and the second mounting region 21b is arranged to coincide with the optical axis of the light guide plate 3 indicated by the single-dot chain line L.

[0096] As in the central portion 501, the light emitting elements 24 are arranged at the end portions 502 and 503 of the first mounting region 21a and the second mounting region 21b at an arrangement interval D1 along the length direction of the substrate 20. However, the light emitting elements 24 arranged at the end portions 502 and 503 of the first mounting region 21a and the second mounting region 21b are arranged so that the optical axes are located closer to the emission surface 32 than the optical axis of the light guide plate 3.

[0097] Since the light emitting element 24 is arranged at the ends 502 and 503 of the linear light emitting portion 103 so that the optical axis is located closer to the emission surface 32 than the optical axis of the light guide plate 3, the light emitted from the ends 502 and 503 is emitted from the emission surface 32 of the light guide plate 3 at a position closer to the linear light emitting portion 103. In the linear light emitting portion 103, since the light emitted from the ends is emitted from the emission surface 32 at a position closer to the linear light emitting portion 103, the brightness of the light emitted from the emission surface 32 near the protrusion 33 of the light guide plate 3 can be made substantially equal to the brightness of the light emitted from the emission surface 32 away from the protrusion 33.

[0098] In addition, since the linear light emitting portion 103 arranges the light emitting element 24 at the ends 502 and 503 so that the optical axis is located closer to the emission surface 32 than the optical axis of the light guide plate 3, part of the light emitted from the ends 502 and 503 is imaged. Figure 83. In the linear light-emitting portion 103, since the light emitted from the end is emitted from the emission surface 32 at a position closer to the linear light-emitting portion 103, the brightness of the light emitted from the emission surface 32 near the protrusion 33 of the light guide plate 3 can be made substantially equal to the brightness of the light emitted from the emission surface 32 away from the protrusion 33.

[0099] Fig. 9 is a perspective top view of a planar light-emitting device having a linear light-emitting portion according to a fifth variant, Fig.10 This is an enlarged top view of the linear light-emitting portion of the fifth variant.

[0100] The planar light emitting device 81 is different from the planar light emitting device 1 in that it has a substrate 140 and a circuit 125, and the substrate 140 has a mounting substrate 20a and a circuit substrate 140b. The configuration and function of the components of the planar light emitting device 81 other than the linear light emitting unit 104 and the light guide plate 35 are the same as those of the planar light emitting device 1 with the same reference numerals, and therefore detailed description thereof is omitted here.

[0101] The linear light emitting unit 104 is different from the linear light emitting unit 2 in that it has a substrate 140 instead of the substrate 20, and the substrate 140 has a mounting substrate 20a and a circuit substrate 140b. The structure and function of the linear light emitting unit 104 other than the substrate 140 are the same as those of the linear light emitting unit 2, so detailed description is omitted here.

[0102] The circuit substrate 140b is different from the circuit substrate 20b in that an opening corresponding to a single mounting area 21c is formed. The configuration and function of the circuit substrate 140b other than the mounting area 21c are the same as those of the circuit substrate 20b, so detailed description is omitted here.

[0103] The light emitting elements 24 are arranged in one row in the central portion 601 of the mounting region 21c along the length direction of the substrate 140, and are arranged in two rows in the end portions 602 and 603 of the mounting region 21c along the length direction of the substrate 140. The light emitting elements 24 are arranged at a uniform arrangement interval D1 in the central portion 601 and the end portions 602 and 603 of the mounting region 21c along the length direction of the substrate 140.

[0104] The light guide plate 35 is different from the light guide plate 3 in that the protrusions 33 are only arranged on both sides of the incident surface 31 in the longitudinal direction and not in the central portion. The structure and function of the light guide plate 35 other than the arrangement position of the protrusions 33 are the same as those of the light guide plate 3, so detailed description is omitted here.

[0105] In the planar light-emitting device 81, the light-emitting elements 24 are arranged in one row in the central portion of the mounting region 21c along the length direction of the substrate 140, and are arranged in two rows in the end portion of the mounting region 21c along the length direction of the substrate 140. Since the light-emitting elements 24 are arranged in two rows at the end portion of the mounting region 21c where the brightness is reduced due to interference with the protrusion 33 of the light guide plate 3, the brightness reduction caused by the protrusion 33 can be compensated and light with more uniform brightness can be emitted.

[0106] In the linear light-emitting portion, when the light-emitting element 24 is installed in a single mounting area as in the fifth variant, the light-emitting element 24 can be arranged in a manner such that the arrangement interval at the end of the mounting area is narrower than the arrangement interval in the center of the mounting area, similar to the linear light-emitting portion 101 of the second variant.

[0107] In addition, in a linear light-emitting portion, when the light-emitting element 24 is installed in a single installation area, the light-emitting element 24 installed at the end of the installation area can be configured in a manner such that the optical axis is located farther from the output surface 32 than the optical axis of the light guide plate 36, similar to the linear light-emitting portion 102 of the third variant.

[0108] In addition, in a linear light-emitting portion, when a light-emitting element 24 is installed in a single installation area, the light-emitting element 24 installed at the end of the installation area can be configured in a manner such that the optical axis is closer to the exit surface 32 than the optical axis of the light guide plate 36, similar to the linear light-emitting portion 103 of the fourth variant.

[0109] In addition, in the planar light-emitting device of the embodiment, the brightness of the protrusion 33 and the vicinity of the end of the light guide plate 35 may be improved by other forms.

[0110] Fig.11 is a perspective top view of a planar light-emitting device having a linear light-emitting portion according to a sixth variant, Fig.12 This is an enlarged top view of the linear light-emitting portion of the 6th variant.

[0111] The planar light emitting device 82 is different from the planar light emitting device 81 in that it has a linear light emitting unit 105 and a light guide plate 36 instead of the linear light emitting unit 104 and the light guide plate 35. The configuration and function of the components of the planar light emitting device 82 other than the linear light emitting unit 105 and the light guide plate 36 are the same as those of the planar light emitting device 81 with the same reference numerals, and therefore detailed description thereof is omitted here.

[0112] The linear light emitting section 105 is different from the linear light emitting section 104 in that the light emitting elements 24 are mounted in a row from one end to the other end of the mounting area 21c in the longitudinal direction of the linear light emitting section 105. The configuration and function of the linear light emitting section 105 other than the arrangement shape of the light emitting elements 24 are the same as those of the linear light emitting section 104, so detailed description is omitted here.

[0113] The light emitting elements 24 are arranged in a row in the central portion 501 of the mounting region 21c along the length direction of the substrate 140, and are arranged in a row in the end portions 602 and 603 of the mounting region 21c along the length direction of the substrate 140. The light emitting elements 24 are arranged at a uniform arrangement interval D1 in the central portion 601 and the end portions 602 and 603 of the mounting region 21c along the length direction of the substrate 140.

[0114] The light guide plate 36 is different from the light guide plate 35 in that the protrusions 33 are not arranged on both sides of the incident surface 31 in the longitudinal direction. The structure and function of the light guide plate 36 other than the arrangement position of the protrusions 33 are the same as those of the light guide plate 35, so detailed description is omitted here.

[0115] In the linear light-emitting portion 105, the back of the central portion is fixed to the side of the lower shell 6b, and the two ends are lifted up by, for example, a fixing member not shown in the figure and leave the side of the lower shell 6b, thereby being bent. If the thickness of the circuit raw material is thinned, the rigidity of the circuit can be reduced, so it can be easily deformed. If it is partially thinned, it becomes an angular shape as when it is bent, and if it is thinned over a large area, it becomes a curved shape. In the linear light-emitting portion 105, the central portion is fixed to the side of the lower shell 6b, and the two ends are away from the side of the lower shell 6b, thereby making the distance between the two ends and the incident surface 31 of the light guide plate 36 shorter than the distance between the central portion and the incident surface 31 of the light guide plate 36.

[0116] In the planar light-emitting device 82, since the distance between the two ends of the linear light-emitting portion 105 and the incident surface 31 of the light guide plate 36 is shorter than the distance between the central portion and the incident surface 31 of the light guide plate 36, it is possible to prevent the brightness of the two end portions of the light guide plate 36 from being darker than the brightness of the central portion of the light guide plate 36.

[0117] Fig.13 is a perspective top view of a planar light-emitting device having a linear light-emitting portion according to the seventh variant, Fig.14 This is an enlarged top view of the linear light-emitting portion of the 7th variant.

[0118] The planar light emitting device 83 is different from the planar light emitting device 81 in that it has a linear light emitting unit 106 and a light guide plate 37 instead of the linear light emitting unit 104 and the light guide plate 35. The configuration and function of the components of the planar light emitting device 83 other than the linear light emitting unit 106 and the light guide plate 37 are the same as the configuration and function of the components of the planar light emitting device 81 with the same reference numerals, and therefore detailed description thereof is omitted here.

[0119] The linear light emitting unit 106 includes a main linear light emitting unit 107, a pair of connection substrates 108, and a pair of sub-linear light emitting units 109. The main linear light emitting unit 107 has the same structure and function as the linear light emitting unit 105 of the sixth modification, so detailed description is omitted here. The pair of connection substrates 108 are each a flexible circuit substrate such as a flexible substrate, and supply the power supplied from the main linear light emitting unit 107 to each of the pair of sub-linear light emitting units 109. When a mounting substrate is provided on the connection substrate 108, heat dissipation is improved. On the other hand, when no mounting substrate is provided, it is easy to bend.

[0120] The pair of sub-linear light emitting units 109 has a substrate 190, and the substrate 190 has a mounting substrate 190a and a circuit substrate 190b. With the power supplied from each side through a pair of connection substrates 108, eight light emitting elements 24 are connected to the line 25 via a wire 28. The number of light emitting elements 24 is determined according to the output voltage of the driving circuit, but the number of light emitting elements 24 connected in series is preferably the same as that of the main linear light emitting unit 107. The reason is that the performance of the sub-linear light emitting unit 109 and the main linear light emitting unit 107 will be consistent. The pair of sub-linear light emitting units 109 are fixed to the side orthogonal to the side of the lower case 6b to which the main linear light emitting unit 107 is fixed.

[0121] The light guide plate 37 is different from the light guide plate 35 in that the length of the light guide plate 37 is shorter due to the configuration of a pair of secondary linear light emitting units 109. The structure and function of the light guide plate 37 other than the shorter length are the same as those of the light guide plate 35, so detailed description is omitted here.

[0122] In the planar light-emitting device 83, light emitted from the ends of the main linear light-emitting portion 107 and a pair of secondary linear light-emitting portions 109 is incident on the ends of the light guide plate 37, thereby preventing the brightness of the two ends of the light guide plate 37 from being darker than the brightness of the central portion of the light guide plate 37.

[0123] Furthermore, in the planar light-emitting device of the seventh variant, the plurality of linear light-emitting portions are connected in a straight line, but in the planar light-emitting device of the embodiment, the plurality of linear light-emitting portions may not be connected in a straight line.

[0124] Fig.15 This is an enlarged top view of the linear light-emitting portion of the eighth variant. Fig.16This is an enlarged top view of the linear light-emitting portion of the 9th variant.

[0125] The linear light emitting section 110 of the eighth modified example includes four main linear light emitting sections 107 arranged to have a rectangular planar shape via a connection substrate 108 . The four main linear light emitting sections 107 are electrically connected via the connection substrate 108 .

[0126] The linear light emitting section 111 of the ninth modified example includes three main linear light emitting sections 107 arranged to have a triangular planar shape via a connection substrate 108 . The three main linear light emitting sections 107 are electrically connected via the connection substrate 108 .

[0127] The linear light emitting unit 110 of the eighth modification and the linear light emitting unit 111 of the ninth modification can be used as a direct backlight source by arranging a plurality of main linear light emitting units 107 in a rectangular or triangular planar shape. In the linear light emitting unit 110 of the eighth modification and the linear light emitting unit 111 of the ninth modification, the brightness of a specific portion of the substrate is higher than the brightness of other portions of the substrate.

[0128] Furthermore, the main linear light emitting section 107 of the embodiment may be arranged in a planar shape other than a triangle or a rectangle such as a tic-tac-toe shape.

[0129] Fig.17 1 and 2 are diagrams showing optical simulation results of the planar light-emitting device according to the embodiment, the planar light-emitting device according to the modification, and the planar light-emitting device according to the comparative example. Fig.17 (a) shows the optical simulation result of the planar light-emitting device 1 according to the embodiment. Fig.17 (b) shows the optical simulation results of the planar light-emitting device equipped with the linear light-emitting section 102 according to the second variation. Fig.17 (c) shows the optical simulation result of the planar light emitting device equipped with the linear light emitting unit 103 according to the third variation. Fig.17 (d) shows the optical simulation results of the planar light-emitting device equipped with the linear light-emitting unit 104 according to the fourth variation. Fig.17 (e) shows the optical simulation result of the planar light-emitting device 82 of the sixth variation. Fig.17 (f) shows the optical simulation results of the planar light-emitting device 83 of the seventh variation. Fig.17 (g) shows the optical simulation results of the planar light-emitting device of the comparative example.

[0130] Fig.17The simulation results shown are obtained by simulation using LightTools produced by CYBERNET SYSTEMS as a simulation model. The size of the planar light-emitting device is 12.3 inches, and the size of the output surface of the planar light is 293.8mm×111.4mm. The thickness of the light guide plate is 3.2mm. The linear light-emitting portion is formed in a shape called a binocular type with two mounting areas formed on a substrate with an LES of 140.85mm and a width of 4.9mm, and 26 light-emitting element columns are mounted in parallel, and the light-emitting element column is formed by 8 light-emitting elements connected in series. The two mounting areas are each surrounded by a frame with a width of 0.95mm. The size of the light-emitting element installed in the linear light-emitting portion is a 0.2mm thick LED with a planar shape of a square with a square size of 0.65mm.

[0131] exist Fig.17 In the simulation corresponding to the embodiment shown in (a), the light emitting elements are installed at a pitch of 1.342 mm along the length direction, and the spacing between the frame and the light emitting elements at the end of the mounting area is set to 0.325 mm. In addition, at the end of the mounting area, 6 light emitting elements are installed in 2 rows at a spacing of 0.25 mm.

[0132] exist Fig.17 In the simulation corresponding to the second variation shown in (b), the light emitting elements are mounted at a pitch of 1.398 mm in the longitudinal direction within the mounting region, and at a pitch of 0.9 mm at the end of the mounting region.

[0133] exist Fig.17 In the simulation corresponding to the third variant shown in (c), the light-emitting elements are installed at a pitch of 1.342 mm along the length direction in the mounting area, and are installed at the end of the mounting area in a manner such that the centers of the six light-emitting elements are moved downward by 0.3 mm from the center of the light guide plate.

[0134] exist Fig.17 In the simulation corresponding to the fourth variant shown in (d), the light-emitting elements are installed at a pitch of 1.342 mm along the length direction in the mounting area, and are installed at the end of the mounting area in a manner such that the centers of the six light-emitting elements are moved upward by 0.3 mm from the center of the light guide plate.

[0135] exist Fig.17In the simulation corresponding to the sixth variation shown in (e), the distance between the end of the mounting area and the light guide plate is changed for the light emitting elements arranged at a pitch of 1.342 mm along the length direction of the linear light emitting portion. The distance between the end of the mounting area and the light guide plate is gradually increased in the order of 0.01 mm, 0.078 mm, 0.146 mm, 0.214 mm, and 0.282 mm, and then the distance between the other end and the light guide plate to the sixth light emitting element is set to 0.35 mm.

[0136] exist Fig.17 In the simulation corresponding to the seventh variation shown in (f), the light emitting elements are mounted on the housing at a pitch of 1.342 mm along the length direction, and six light emitting elements are arranged at a pitch of 1.342 mm in the region of the short side of the housing close to the incident surface of the light guide plate. The distance between the corner of the housing and the light emitting element is 12.474 mm on the long side and 2.675 mm on the short side.

[0137] exist Fig.17 In the simulation corresponding to the comparative example shown in (g), the light emitting elements are mounted at a pitch of 1.342 mm in the longitudinal direction within the mounting region.

[0138] Fig.17 (a) shows a simulation corresponding to the embodiment Fig.17 Compared with the simulation corresponding to the comparative example shown in (g), it was confirmed by optical simulation that the brightness at both ends and the center of the light guide plate was 41 to 46% higher.

[0139] Fig.17 (b) corresponds to the simulation of the second variant. Fig.17 Compared with the simulation corresponding to the comparative example shown in (g), it was confirmed by optical simulation that the brightness at both ends and the center of the light guide plate was 13 to 19% higher.

[0140] Fig.17 The simulation corresponding to the third variant shown in (c) is Fig.17 Compared with the simulation corresponding to the comparative example shown in (g), it was confirmed by optical simulation that the brightness at both ends and the center of the light guide plate was 1 to 2% higher.

[0141] Fig.17 (d) corresponds to the simulation of the fourth variant. Fig.17 Compared with the simulation corresponding to the comparative example shown in (g), it was confirmed by optical simulation that the brightness at both ends and the center of the light guide plate was 5 to 7% higher.

[0142] Fig.17 (e) corresponds to the simulation of the sixth variant. Fig.17Compared with the simulation corresponding to the comparative example shown in (g), it was confirmed by optical simulation that the brightness at both ends of the light guide plate was 110 to 113% higher.

[0143] Fig.17 (f) corresponds to the simulation of the seventh variant. Fig.17 Compared with the simulation corresponding to the comparative example shown in (g), it was confirmed through optical simulation that the brightness at both ends of the light guide plate was 111 to 115% higher.

[0144] Fig.18 The graph shows the measurement results of the brightness distribution of a backlight using a plurality of SMDs arranged in a straight line as a light source and a backlight using the linear light emitting portion of the present disclosure as a light source. Fig.18 (a) is an image showing the brightness distribution of the backlight using the SMD as the light source. Fig.18 (b) is a graph showing the brightness distribution of a backlight using an SMD as a light source. Fig.18 (c) is an image showing the brightness distribution of the backlight using the linear light-emitting portion of the present disclosure as the light source, Fig.18 (d) is a graph showing the brightness distribution of a backlight using the linear light-emitting portion of the present disclosure as a light source. Fig.18 In (b) of FIG. 18 and (d) of FIG. 18 , the horizontal axis represents the position in the longitudinal direction of the light-emitting region, and the vertical axis represents the brightness.

[0145] Fig.18 The simulation shown is a measurement of the brightness distribution at a distance of 500 mm from the light-emitting element when a forward current of 80 mA flows through each LED using a 2D spectroradiometer SR-5000-HWS manufactured by TOPCON TECHNOHOUSE Co., Ltd. In the case of a backlight using SMD as a light source, white LEDs (CL-A131-1W4) manufactured by Citizen Electronics Co., Ltd. are arranged at a pitch of 8.2 mm.

[0146] In the case of a backlight using an SMD as a light source, in the light guide plate 3, although the brightness is high directly above the SMD mounted on the substrate 20, the brightness between the SMDs is substantially zero, and the brightness directly above the SMD is different from the brightness between the SMDs. In the case of a backlight using an SMD as a light source, the light emitted from the light source has uneven brightness, with the brightness being different directly above the SMD and between the SMDs.

[0147] In the case of a backlight using the linear light-emitting portion disclosed herein as a light source, the brightness near the two ends of the light-emitting area in the longitudinal direction is brighter than other parts. In addition, the brightness of the central part of the light-emitting area is the same, confirming that the backlight using the linear light-emitting portion disclosed herein as a light source emits light with uniform brightness.

[0148] Fig.19It is a diagram showing the relationship between the element arrangement and the radiation intensity of the linear light emitting section 2 according to the embodiment. Fig.19 In FIG. 1 , the horizontal axis represents the position in the width direction, and the vertical axis represents the radiation intensity. In addition, curve 191 represents the radiation intensity when one light emitting element 24 is arranged in the width direction, and curve 192 represents the radiation intensity when two light emitting elements 24 are arranged in the width direction.

[0149] The maximum value of the curve 192 indicating the radiation intensity when two light emitting elements 24 are arranged in the width direction is about 1.5 times the maximum value of the curve 191 indicating the radiation intensity when one light emitting element 24 is arranged in the width direction. In the linear light emitting portion 2, the radiation intensity can be increased by increasing the number of light emitting elements 24 arranged in the width direction while keeping the length of the light emitting region in the width direction constant. Furthermore, when SMD is used as the light emitting element, if the number of light emitting elements arranged in the width direction is increased, the length of the light emitting region in the width direction will increase, so the light emitting intensity per unit area will not increase.

[0150] Furthermore, from another perspective, the planar light-emitting device disclosed herein is characterized in that it comprises a linear light-emitting portion, a light guide plate, and a housing, wherein the linear light-emitting portion has:

[0151] a substrate extending in a prescribed direction;

[0152] A plurality of light emitting elements arranged on a substrate along a predetermined direction; and

[0153] a sealing material arranged inside the frame in order to seal the plurality of light emitting elements,

[0154] The light guide plate has an incident surface on which light emitted from the linear light emitting portion is incident, a protrusion disposed on the incident surface, and an exit surface from which light incident from the incident surface is exited.

[0155] The housing accommodates the linear light emitting portion and the light guide plate in such a manner that the light emitting area of ​​the linear light emitting portion faces the incident surface of the light guide plate and the protrusion of the light guide plate abuts against the linear light emitting portion.

[0156] The plurality of light emitting elements are evenly arranged at a first arrangement pitch along a predetermined direction in a region away from the end of the linear light emitting portion, and are evenly arranged at a second wiring pitch narrower than the first arrangement pitch along the predetermined direction in a region close to the end of the linear light emitting portion.

[0157] Furthermore, in the planar light-emitting device, the plurality of light-emitting elements are preferably arranged in a row along a predetermined direction.

[0158] In addition, from another perspective, the planar light-emitting device disclosed herein is characterized in that it comprises a linear light-emitting portion, a light guide plate, and a housing, wherein the linear light-emitting portion has:

[0159] a substrate extending in a prescribed direction;

[0160] A plurality of light emitting elements are arranged on a substrate along a predetermined direction;

[0161] a frame body arranged on the substrate so as to surround the plurality of light emitting elements; and

[0162] a sealing material arranged inside the frame in order to seal the plurality of light emitting elements,

[0163] The light guide plate has an incident surface on which light emitted from the linear light emitting portion is incident, a protrusion disposed on the incident surface, and an exit surface from which light incident from the incident surface is exited.

[0164] The housing accommodates the linear light emitting portion and the light guide plate in such a manner that the light emitting area of ​​the linear light emitting portion faces the incident surface of the light guide plate and the protrusion of the light guide plate abuts against the linear light emitting portion.

[0165] The plurality of light emitting elements are arranged in a region away from the end of the linear light emitting portion with their optical axes aligned with the optical axis of the light guide plate, and in a region close to the end of the linear light emitting portion with their optical axes deviating from the optical axis of the light guide plate in the height direction of the incident surface.

[0166] Furthermore, in the planar light emitting device, the plurality of light emitting elements are preferably arranged in a region near an end of the linear light emitting portion so that the optical axis is closer to the emission surface than the optical axis of the light guide plate.

[0167] Furthermore, in the planar light emitting device, the plurality of light emitting elements are preferably arranged in a region near an end of the linear light emitting portion such that the optical axis is located farther from the emission surface than the optical axis of the light guide plate.

[0168] Furthermore, in the planar light-emitting device, the plurality of light-emitting elements are preferably arranged in a row along a predetermined direction.

[0169] In addition, from another perspective, the planar light-emitting device disclosed herein is characterized in that it comprises a linear light-emitting portion, a light guide plate, and a housing, wherein the linear light-emitting portion has:

[0170] a substrate extending in a prescribed direction;

[0171] A plurality of light emitting elements are arranged on a substrate along a predetermined direction;

[0172] a frame body arranged on the substrate so as to surround the plurality of light emitting elements; and a sealing material arranged inside the frame body in order to seal the plurality of light emitting elements,

[0173] The light guide plate has an incident surface for incident light emitted from the linear light emitting portion and an exit surface for exiting light incident from the incident surface.

[0174] The housing accommodates the linear light emitting portion and the light guide plate in a manner such that the light emitting area of ​​the linear light emitting portion faces the incident surface of the light guide plate.

[0175] The linear light emitting portion is bent and arranged so that the distance between both ends and the incident surface is closer than the distance between the central portion and the incident surface.

[0176] In addition, from another perspective, the planar light-emitting device disclosed herein is characterized in that it comprises a first linear light-emitting portion, a second linear light-emitting portion, a third linear light-emitting portion, and a housing, wherein the first linear light-emitting portion, the second linear light-emitting portion, and the third linear light-emitting portion respectively have:

[0177] a substrate extending in a prescribed direction;

[0178] A plurality of light emitting elements are arranged on a substrate along a predetermined direction;

[0179] a frame body arranged on the substrate so as to surround the plurality of light emitting elements; and a sealing material arranged inside the frame body in order to seal the plurality of light emitting elements,

[0180] The housing accommodates the first linear light emitting unit, the second linear light emitting unit, the third linear light emitting unit and the light guide plate in a manner that the light emitting area of ​​the first linear light emitting unit is opposite to the incident surface of the light guide plate and the protrusion of the light guide plate abuts against the linear light emitting unit.

[0181] The second linear light emitting portion and the third linear light emitting portion are arranged so that one end thereof is close to the first linear light emitting portion.

Claims

1. A linear light emitting device, characterized in that: The invention is a linear light emitting device that emits light toward a light guide plate having an incident surface and protrusions arranged at both ends of the incident surface, and has: a substrate, which can be arranged opposite to the incident surface and has a flat mounting area and extends in a predetermined direction; A plurality of light emitting elements arranged along the specified direction on the mounting area of ​​the substrate; a sealing material that integrally seals the plurality of light emitting elements; and a contact area disposed at least on one of the two ends of the mounting area so as to contact the protrusion; The plurality of light emitting elements are arranged in a central portion of the mounting area so that their optical axes coincide with the optical axis of the light guide plate, and in a region near an end of the mounting area so that their optical axes deviate from the optical axis of the light guide plate in a height direction of the incident surface. A specific portion of the substrate has a higher brightness than other portions of the substrate.

2. The linear light emitting device according to claim 1, characterized in that: The mounting area includes: a first mounting area extending along the prescribed direction; and a second mounting area extending along the prescribed direction and arranged adjacent to the first mounting area in the prescribed direction.

3. The linear light emitting device according to claim 1, characterized in that: The mounting region is not formed in a power supply portion that supplies power to the plurality of light emitting elements.

4. The linear light emitting device according to claim 1, characterized in that: A member for suppressing warping of the substrate is further provided.

5. The linear light emitting device according to claim 1, characterized in that: A housing for controlling light from the light emitting element is further provided.

6. The linear light emitting device according to claim 1, characterized in that: Two or more of the light emitting elements are mounted on a specific portion of the substrate, Two or more of the light emitting elements are mounted on other parts of the substrate.

7. A linear light emitting device, characterized in that: The invention is a linear light emitting device that emits light toward a light guide plate having an incident surface and protrusions arranged at both ends of the incident surface, and has: a substrate which can be arranged opposite to the incident surface, extends in a predetermined direction, and has a flat mounting area extending in the predetermined direction; A plurality of light emitting elements arranged along the specified direction and only on the mounting area; a sealing material that seals the plurality of light emitting elements; and a contact area disposed at least on one of the two ends of the mounting area so as to contact the protrusion; The plurality of light emitting elements are arranged in one or more rows along the specified direction in the central portion of the mounting area, and are arranged in a greater number of rows along the specified direction in the region near the end of the mounting area than in the central portion. The brightness of the specific portion of the substrate is 1.1 times or more greater than the brightness of other portions of the substrate.

8. The linear light emitting device according to claim 7, characterized in that: Even if the number of arrangement of the plurality of light emitting elements changes, the mounting region has substantially the same shape.

9. The linear light emitting device according to claim 7 or 8, characterized in that: The mounting area includes: a first mounting area extending along the prescribed direction; and a second mounting area extending along the prescribed direction and arranged adjacent to the first mounting area in the prescribed direction.

10. The linear light emitting device according to claim 7 or 8, characterized in that: The mounting region is not formed in a power supply portion that supplies power to the plurality of light emitting elements.

11. The linear light emitting device according to claim 8, characterized in that: The plurality of light emitting elements are arranged at uniform intervals along the predetermined direction.

12. The linear light emitting device according to claim 7 or 8, characterized in that: A member for suppressing warping of the substrate is further provided.

13. The linear light emitting device according to claim 7 or 8, characterized in that: A housing for controlling light from the light emitting element is further provided.

14. The linear light emitting device according to claim 7, characterized in that: Two or more of the light emitting elements are mounted on a specific portion of the substrate, and two or more of the light emitting elements are mounted on another portion of the substrate.

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