JP2013026240A - Light emitting device and display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light emitting device which efficiently radiates heat without accumulating heat in the device, and to provide a display device including the light emitting device.SOLUTION: A backlight unit 1 includes: a frame member 13 having a plate like bottom part 131; multiple printed boards 12 disposed on the bottom part 131 at equal intervals; multiple LED chips 111a respectively aligned on the printed boards 12; and multiple reflection members 113 respectively provided around the LED chips 111a. Spaces, each of which is enclosed by inclined parts 1132 continuing into each other and the bottom part 131 of the frame member 13 in the adjacent reflection members 113, serve as first heat radiation spaces 41 for radiating heat generated from the LED chips 111a.

Description

  The present invention relates to a light emitting device provided in a backlight unit that irradiates light on the back surface of a display panel, and a display device including the light emitting device.

  In the display panel, liquid crystal is sealed between two transparent substrates, and when a voltage is applied, the orientation of the liquid crystal molecules is changed and the light transmittance is changed to optically display a predetermined image or the like. Is done. In this display panel, since the liquid crystal itself is not a light emitter, for example, the back side of the transmissive display panel is irradiated with light using a cold cathode tube (CCFL), a light emitting diode (LED), or the like as a light source. A backlight unit is provided.

  In the backlight unit, light sources such as cold-cathode tubes and LEDs are arranged on the bottom surface to emit light, and light sources such as cold-cathode tubes and LEDs are arranged on the edge of a transparent plate called a light guide plate. There is an edge light type that emits light to the front surface by dot printing or pattern shape provided on the back surface through light from the light plate edge.

  Although LEDs have excellent characteristics such as low power consumption, long life, and reduced environmental impact by not using mercury, white LEDs are expensive until they are invented. The use of the backlight unit as a light source was delayed due to the absence of light and the higher directivity. However, in recent years, high color rendering high-intensity white LEDs are rapidly spreading in lighting applications, and the LEDs are becoming cheaper accordingly. Therefore, as a light source of a backlight unit, a transition from a cold cathode tube to an LED is performed. Is progressing.

  Since the LED has strong directivity, the edge light type is more effective than the direct type from the viewpoint of irradiating light so that the luminance of the surface of the display panel is uniform in the surface direction. However, the edge light type backlight unit has a problem that heat generated by the light source is concentrated due to the light source being concentrated on the edge portion of the light guide plate, and the bezel portion of the display panel is enlarged. Arise. Furthermore, the edge light type backlight unit has a great restriction on partial dimming control (local dimming), which is attracting attention as a control method capable of improving the quality and power saving of a display image. There is a problem that it is not possible to control a small divided area where high quality and power saving can be achieved.

  Therefore, in a direct type backlight unit advantageous for partial dimming control, even when a highly directional LED is used as a light source, light with a uniform amount of light in the surface direction is applied to the display panel. Studies on methods that can be irradiated are underway.

  For example, in Patent Document 1, a display panel is divided into a plurality of rectangular areas, and a plurality of light source units corresponding to the respective rectangular areas are connected so that dimming control can be performed for each of the divided rectangular areas. A backlight unit is disclosed. In the backlight unit disclosed in Patent Document 1, each light source unit has a rectangular frame formed in a size corresponding to a rectangular area of the display panel, and a light emitting surface at the center of the bottom of the rectangular frame. The light-emitting element is configured to include an upward-facing light-emitting element, and a light-guide reflector that is disposed directly above the light-emitting element and has an inverted conical shape with the apex facing downward.

  In the technique disclosed in Patent Document 1, light having a strong directivity emitted from a light emitting element is diffused in a direction intersecting the optical axis of the light emitting element by a light guide reflector so that the amount of light is uniform in the surface direction. The display panel can be irradiated with the emitted light.

JP 2010-238420 A

  However, in the technique disclosed in Patent Document 1, since the plurality of light source units are each partitioned by a rectangular frame, heat generated by light emission from the light-emitting elements tends to stay in each rectangular frame. turn into. As described above, when heat is accumulated, output efficiency in a circuit for supplying power to the light emitting element may be reduced, and the life of the light emitting element may be shortened.

  Accordingly, an object of the present invention is to provide a light emitting device used in a backlight unit of a display device including a display panel, which can efficiently dissipate heat without stagnation of heat in the device, and the light emitting device. A display device is provided.

The present invention includes a casing composed of a frame part and a rectangular plate-shaped bottom part surrounded by the frame part,
A plurality of substrates housed in the housing and arranged at equal intervals on the bottom;
A plurality of light emitting elements arranged in alignment on each of the substrates and emitting light;
A plurality of reflections having a flat base portion provided on each substrate so as to surround each of the plurality of light emitting elements disposed on each substrate, and an inclined portion extending obliquely from an outer peripheral edge of the base portion. A plurality of reflecting members, wherein the outer peripheral edge ends of the inclined portions are connected to each other between adjacent reflecting members,
The light emitting device is characterized in that a space surrounded by the inclined portion and the bottom portion that are connected to each other serves as a first heat radiating space for radiating heat generated from the light emitting element.

  In the light emitting device of the present invention, the base portion and the inclined portion are formed to have the same thickness.

Further, in the light emitting device of the present invention, the reflecting member has a polygonal outer peripheral shape when seen in a plan view, and each side portion of the outer peripheral shape corresponding to the outer peripheral edge of the inclined portion is adjacent to the reflecting member. Connected with each other,
The first heat radiation space is formed between the bottom portion and the inclined portion so as to correspond to each side portion of the outer peripheral shape that is continuous between adjacent reflecting members.

  In the light-emitting device of the present invention, heat generated from the light-emitting element is transmitted to the first heat radiating space on the surface of the base and the inclined portion on the side facing the bottom. A transmission unit is formed.

  Further, in the light emitting device of the present invention, the surfaces of the inclined portions that are continuous with each other in the adjacent reflecting members extend along a straight line.

  In the light emitting device of the present invention, a surface of the inclined portion that is continuous with each other in the adjacent reflecting member extends to be parallel to a long side or a short side of the bottom portion.

Further, in the light emitting device of the present invention, the base portion protrudes away from the substrate, and has a raised portion that continues to the inclined portion,
The space surrounded by the raised portion and the bottom portion is a second heat radiating space that guides an air flow caused by heat generated from the light emitting element to the first heat radiating space.

The present invention also provides a display panel,
A display device comprising: the light emitting device that irradiates light on a back surface of the display panel.

  According to the present invention, a light emitting device includes a housing having a rectangular plate-shaped bottom portion surrounded by a frame portion, a plurality of substrates arranged at equal intervals on the bottom portion, and a plurality of light emitting devices arranged in alignment on the substrate. An element and a plurality of reflecting members provided around each light emitting element are included. Each reflecting member has a flat base portion provided on the substrate and an inclined portion extending inclined from the outer peripheral edge portion of the base portion, and the outer peripheral edge portions of the inclined portions are connected to each other between adjacent reflecting members. . A space surrounded by the inclined portion and the bottom portion of the casing is a first heat radiating space for radiating heat generated from the light emitting element.

  The heat generated when the light emitting element emits light conducts the reflecting member and the substrate, and warms the air existing around the light emitting element, such as the air existing between the reflecting member and the bottom of the housing. In the light emitting device of the present invention, since the space surrounded by the inclined portion and the bottom portion of the housing is the first heat dissipation space, the warm air existing around the light emitting element does not stay. The airflow is formed to flow through the first heat radiation space. Therefore, heat can be efficiently radiated without heat remaining in the apparatus.

  According to the invention, in the reflecting member, the base portion and the inclined portion are formed to have the same thickness. As a result, for example, a reflecting member made of a resin material can be accurately manufactured by a method such as vacuum forming, so that light emitted from the light emitting element can be accurately reflected by the reflecting member, and in the surface direction. A uniform amount of irradiation light can be obtained.

  Further, according to the present invention, the reflecting member has a polygonal outer peripheral shape when seen in a plan view, and each side part of the outer peripheral shape corresponding to the outer peripheral edge of the inclined portion is between adjacent reflecting members. It is a series. The first heat radiation space is formed between the bottom portion of the housing and the inclined portion of the reflection member so as to correspond to each side portion of the outer peripheral shape that is continuous between the adjacent reflection members. As a result, the airflow generated by the heat generated from the light emitting element can be generated in a plurality of directions corresponding to the respective side portions, so that heat can be efficiently radiated without the heat remaining in the apparatus.

  Further, according to the present invention, heat generated from the light emitting element is transmitted to the first heat radiating space on the surface of the reflecting member on the side of the base portion and the inclined portion facing the bottom portion of the housing, and has heat conductivity. A transmission part is formed. As a result, the heat generated from the light emitting element can be transmitted to the first heat dissipation space via the heat transfer portion having thermal conductivity, so that heat can be efficiently radiated.

  Moreover, according to this invention, the surface which faces the 1st thermal radiation space of the inclination part which mutually continues in an adjacent reflection member extends along a straight line. In the light emitting device having the reflection member configured as described above, the first heat radiation space which is a space surrounded by the inclined portion and the bottom portion of the casing that are connected to each other in the adjacent reflection member is formed to extend along a straight line. Will be. As a result, the flow of the air flow caused by the heat generated from the light emitting element can be made smooth in the first heat radiation space, so that heat can be efficiently radiated.

  Moreover, according to this invention, the surface which faces the 1st thermal radiation space of the inclination part which mutually continues in an adjacent reflection member extends in parallel with the long side or short side of the bottom part of a housing | casing. In the light emitting device having the reflection member configured as described above, the first heat radiation space that is a space surrounded by the inclined portion and the bottom portion of the casing that are connected to each other in the adjacent reflection member is the long side of the bottom portion of the casing or It is formed extending in parallel with the short side. Thereby, for example, when the light emitting device is installed so that the bottom of the housing is parallel to the vertical direction, that is, the long side or the short side of the bottom is parallel to the vertical direction, the first heat dissipation space is , And extending in the vertical direction. As a result, the air warmed by the heat generated from the light emitting element forms an updraft along the vertical direction and flows through the first heat radiation space. Therefore, heat can be efficiently radiated without heat remaining in the apparatus.

  According to the invention, the base portion of the reflecting member has a raised portion that protrudes away from the substrate and continues to the inclined portion. And the space enclosed by the bottom part of the housing | casing and the protruding part of a reflection member becomes the 2nd thermal radiation space which guides the airflow by the heat | fever which generate | occur | produced from the light emitting element to the 1st thermal radiation space. As a result, the air heated by the heat generated from the light emitting element can be guided to the first heat radiating space via the second heat radiating space, so that heat can be efficiently radiated.

  Further, according to the present invention, the display device includes the light emitting device according to the present invention, which can efficiently dissipate heat without stagnation in the device, so that a high-quality image can be displayed over a long period of time. Can be displayed on the panel.

It is a disassembled perspective view which shows the structure of the liquid crystal display device 100 which concerns on one Embodiment of this invention. It is a figure which shows typically the cross section of the liquid crystal display device 100 when it cut | disconnects by the cut surface line AA in FIG. It is a figure which shows typically the cross section of the liquid crystal display device 100 when it cut | disconnects by the cut surface line BB in FIG. It is a figure which shows the base 111 and LED chip 111a. It is a figure which shows the LED chip 111a and the base 111 which were mounted in the printed circuit board 12. It is a figure which shows the positional relationship of the LED chip 111a supported by the base 111, and the lens 112. FIG. It is a figure for demonstrating the optical path of the light radiate | emitted from the LED chip 111a. It is a figure for demonstrating a mode that the heat which generate | occur | produced from LED chip 111a is thermally radiated. It is a figure for demonstrating a heat | fever emitted from LED chip 111a in the case where the backlight unit 1 is arrange | positioned so that the longitudinal direction of the printed circuit board 12 may correspond with a perpendicular direction. It is a figure for demonstrating a heat | fever emitted from LED chip 111a in the case where the backlight unit 1 is arrange | positioned so that the longitudinal direction of the printed circuit board 12 may correspond with a perpendicular direction. It is a figure for demonstrating a heat | fever generated from LED chip 111a in the case where the backlight unit 1 is arrange | positioned so that the longitudinal direction of the printed circuit board 12 may correspond with a horizontal direction. It is a figure for demonstrating a heat | fever generated from LED chip 111a in the case where the backlight unit 1 is arrange | positioned so that the longitudinal direction of the printed circuit board 12 may correspond with a horizontal direction. It is a figure for demonstrating the heat transfer part 51 formed in the back surface of the reflection member 113. FIG. FIG. 4 is a diagram showing a configuration of a backlight unit 60.

  FIG. 1 is an exploded perspective view showing a configuration of a liquid crystal display device 100 according to an embodiment of the present invention. FIG. 2 is a diagram schematically showing a cross section of the liquid crystal display device 100 when cut along the cutting plane line AA in FIG. FIG. 3 is a diagram schematically showing a cross section of the liquid crystal display device 100 when cut along the cutting plane line BB in FIG. 1.

  The liquid crystal display device 100 which is a display device of the present invention is a device that displays an image on a display screen by outputting image information in a television or a personal computer. The display screen is formed by a liquid crystal panel 2 that is a transmissive display panel having liquid crystal elements, and the liquid crystal panel 2 is formed in a rectangular flat plate shape. In the liquid crystal panel 2, two surfaces in the thickness direction are a front surface 21 and a back surface 22. The liquid crystal display device 100 displays an image so as to be visible when viewed from the front surface 21 toward the rear surface 22.

  The liquid crystal display device 100 includes a liquid crystal panel 2 and a backlight unit 1 that includes a plurality of light emitting units 11 and is a light emitting device according to the present invention.

  The liquid crystal panel 2 is supported by the side wall portion 132 in parallel with the bottom surface 131a of the bottom portion 131 of the frame member 13 which is a casing that is provided in the backlight unit 1 and includes a frame portion and a bottom portion 131 surrounded by the frame portion. The liquid crystal panel 2 includes two substrates and is formed in a rectangular plate shape when viewed from the thickness direction. The liquid crystal panel 2 includes a switching element such as a thin film transistor (TFT), and liquid crystal is injected into a gap between the two substrates.

  The liquid crystal panel 2 exhibits a display function by being irradiated with light from the backlight unit 1 disposed on the back surface 22 side as a backlight. The two substrates are provided with drivers (source drivers) for driving the pixels in the liquid crystal panel 2, various elements, and wirings.

  In the liquid crystal display device 100, a diffusion plate 3 is disposed between the liquid crystal panel 2 and the backlight unit 1 in parallel with the liquid crystal panel 2. This diffusion plate 3 becomes an irradiated body. A prism sheet (not shown) may be disposed between the liquid crystal panel 2 and the diffusion plate 3.

  The diffusion plate 3 prevents the brightness from being locally biased by diffusing the light emitted from the backlight unit 1 in the surface direction. The prism sheet directs the traveling direction of the light reaching from the back surface 22 side through the diffusion plate 3 to the front surface 21 side. In the diffusing plate 3, in order to prevent the luminance from being biased in the surface direction, the traveling direction of light includes a lot of components in the surface direction as vector components. On the other hand, the prism sheet converts the traveling direction of light containing a lot of vector components in the surface direction into the traveling direction of light containing many components in the thickness direction. Specifically, the prism sheet is formed with a large number of lens or prism-shaped portions arranged in the plane direction, thereby reducing the diffusion of light traveling in the thickness direction. Therefore, the luminance can be increased in the display by the liquid crystal display device 100.

  The backlight unit 1 is a direct type backlight device that irradiates the liquid crystal panel 2 with light from the back surface 22 side. The backlight unit 1 includes a plurality of light emitting units 11 that irradiate light to the liquid crystal panel 2 through the diffusion plate 3, a plurality of printed circuit boards 12, and a frame member 13.

  The frame member 13 is a basic structure of the backlight unit 1, and has a rectangular flat plate-shaped bottom portion 131 that faces the liquid crystal panel 2 at a predetermined interval, and a side wall portion 132 that continues to the bottom portion 131 and rises from the bottom portion 131. Consists of. The bottom 131 is formed in a rectangular shape when viewed from the thickness direction, and its size is slightly larger than that of the liquid crystal panel 2. The side wall part 132 is formed to rise from the two end parts forming the short side of the bottom part 131 and the two end parts forming the long side to the front surface 21 side of the liquid crystal panel 2. As a result, four flat side wall portions 132 are formed around the bottom portion 131.

  The printed circuit board 12 is fixed to the bottom 131 of the frame member 13. The printed circuit board 12 is, for example, a substrate made of glass epoxy having conductive layers formed on both sides. In this embodiment, each printed circuit board 12 is formed in a rectangular plate shape, and is arranged at equal intervals in the long side direction of the bottom portion 131 so that the long side (longitudinal direction) is parallel to the short side direction of the bottom portion 131. Has been. A plurality of light emitting units 11 are provided on the printed circuit board 12.

The plurality of light emitting units 11 irradiate the liquid crystal panel 2 with light through the diffusion plate 3. In the present embodiment, a plurality of printed circuit boards 12 provided with a plurality of light emitting units 11 are disposed so as to face the entire back surface 22 of the liquid crystal panel 2 through the diffusion plate 3 with the plurality of light emitting units 11 as one group. By arranging in parallel, the light emitting units 11 are provided in a matrix. Each light emitting unit 11 is formed in a square shape when viewed from the side of the diffuser plate 3 that is an object to be irradiated, that is, when viewed from a direction perpendicular to the bottom 131 of the frame member 13. The luminance of the surface is defined to be 5000 cd / m ^2, and the length of one side is, for example, 55 mm.

  Each of the plurality of light emitting units 11 includes a light emitting diode (LED) chip 111a that is a light emitting element, a base 111 that supports the LED chip 111a, a lens 112 that is an optical member, and a reflecting member 113.

  FIG. 4 is a diagram showing the base 111 and the LED chip 111a. 4A is a plan view, FIG. 4B is a front view, and FIG. 4C is a bottom view.

  The base 111 is a member for supporting the LED chip 111a and is made of resin. The base 111 has a square support surface for supporting the LED chip 111a, and the length L1 of one side of the square is, for example, 3 mm. Moreover, the height of the base 111 is 1 mm, for example.

  As shown in FIG. 4, the base 111 includes a base main body 111g made of ceramics and two electrodes 111c provided on the base main body 111g. The LED chip 111a includes a support surface of the base 111, The base body 111g is fixed to the center of the upper surface with an adhesive member 111f. The two electrodes 111c are spaced apart from each other, and are respectively provided over the top surface, the side surface, and the bottom surface of the base body 111g. Two terminals (not shown) of the LED chip 111a and the two electrodes 111c are connected by two bonding wires 111d, respectively. The LED chip 111a and the bonding wire 111d are sealed with a transparent resin 111e such as silicon resin.

  FIG. 5 is a diagram showing the LED chip 111 a and the base 111 mounted on the printed circuit board 12. The LED chip 111 a is mounted on the printed circuit board 12 via the base 111 and emits light in a direction away from the printed circuit board 12. The LED chip 111 a is located at the center of the base 111 when the light emitting unit 11 is viewed in plan from the diffuser plate 3 side, that is, when viewed from a direction perpendicular to the bottom 131 of the frame member 13. In the plurality of light emitting units 11, the light emission control by the LED chips 111 a can be controlled independently of each other. Thereby, the backlight unit 1 can perform partial dimming control (local dimming).

  When mounting the LED chip 111a and the base 111 on the printed circuit board 12, first, solder is respectively applied to the two connection terminal portions 121 of the conductive layer pattern included in the printed circuit board 12, and the base body is attached to the solder. The base 111 and the LED chip 111a fixed to the base 111 are placed on the printed circuit board 12 by, for example, an automatic machine (not shown) so that the two electrodes 111c provided on the bottom surface of 111g match each other. The printed circuit board 12 on which the base 111 and the LED chip 111a fixed to the base 111 are placed is sent to a reflow tank that irradiates infrared rays, and the solder is heated to about 260 ° C. And are soldered.

  FIG. 6 is a diagram showing a positional relationship between the LED chip 111 a supported by the base 111 and the lens 112.

  The LED chips 111a provided in each of the plurality of light emitting units 11 are arranged in a matrix when the light emitting unit 11 is viewed in plan view from the diffusion plate 3 side, that is, when viewed from a direction perpendicular to the bottom 131 of the frame member 13. The distance between the LED chips 111a that are arranged and adjacent to each other is the same in both the row direction and the column direction.

  The lens 112 is provided in contact with the base 111 by insert molding so as to cover the base 111 that supports the LED chip 111a, and reflects or refracts light emitted from the LED chip 111a in a plurality of directions. That is, the lens 112 diffuses light. The lens 112 is a transparent lens, and is made of, for example, silicon resin or acrylic resin.

  In the lens 112, the upper surface 112a, which is a surface facing the liquid crystal panel 2 through the diffusion plate 3, is curved with a recess in the center, and the side surface 112b is in a substantially cylindrical shape parallel to the optical axis S of the LED chip 111a. The diameter L2 in the cross section formed and orthogonal to the optical axis S is, for example, 10 mm, extends outward with respect to the base 111, and is lateral to the base 111 (perpendicular to the support surface of the base 111. The four surfaces are provided so as to cover at least a part thereof. That is, the lens 112 is larger than the base 111 in the direction orthogonal to the optical axis S of the LED chip 111a (the diameter L2 of the lens 112 is larger than the length L1 of one side of the support surface of the base 111). As described above, the lens 112 is provided so as to extend outward with respect to the base 111, so that the light emitted from the LED chip 111a can be diffused by the lens 112 over a wide range.

  The height H1 of the lens 112 is 4.5 mm, for example, and is smaller than the diameter L2. In other words, the lens 112 has a length (diameter L2) in a direction orthogonal to the optical axis S of the LED chip 111a larger than the height H1. The light incident on the lens 112 is diffused in the direction intersecting the optical axis S inside the lens 112.

  As described above, the diameter L2 is set larger than the height H1 in order to reduce the thickness of the backlight unit 1 and to uniformly irradiate the liquid crystal panel 2 with light. In order to reduce the thickness of the backlight unit 1, it is necessary to reduce the height H1 of the lens 112, that is, to make the lens 112 as thin as possible. However, when the lens 112 is thinned, uneven illuminance tends to occur on the back surface 22 of the liquid crystal panel 2, and as a result, uneven brightness tends to occur on the front surface 21 of the liquid crystal panel 2. In particular, when the distance between the adjacent LEDs 111a is long, the area between the adjacent LED chips 111a on the back surface 22 of the liquid crystal panel 2 is far from the LED chip 111a, and the amount of irradiation light is reduced. Irradiance unevenness (brightness unevenness) is likely to occur between the region adjacent to the LED chip 111a.

  In order to irradiate the light emitted from the LED chip 111a to a region far from the LED chip 111a via the lens 112, it is necessary to increase the diameter L2 of the lens 112 to some extent. In this embodiment, the lens 112 By making the diameter L2 of the light source larger than the height H1, the backlight unit 1 can be made thinner and the liquid crystal panel 2 can be uniformly irradiated with light.

  If the diameter L2 of the lens 112 is made smaller than the height H1 of the lens 112, not only thinning and uniform irradiation become difficult, but also an insert for integrally molding the lens 112 and the LED chip 111a. In molding, there is a problem that the balance tends to be poor. Further, when soldering an integrally molded product including the LED chip 111a and the base 111b and the insert-molded lens 112 to the printed circuit board 12, the balance is easily lost, and there is a problem in assembly.

  The upper surface 112a of the lens 112 includes a central portion 1121, a first curved portion 1122, and a second curved portion 1123. In the lens 112, the curved upper surface 112a having a dent in the central portion is a first region that totally reflects the emitted light and emits it from the side surface 112b, and a second region that refracts the emitted light outward and emits it. And having a region. The first region is formed in the first curved portion 1122, and the second region is formed in the second curved portion 1123.

  The central portion 1121 is formed at the central portion of the upper surface 112a facing the liquid crystal panel 2 through the diffusion plate 3, and the center of the central portion 1121 (that is, the optical axis of the lens 112) is on the optical axis S of the LED chip 111a. Located in. The central portion 1121 is formed in a circular shape parallel to the light emitting surface of the LED chip 111a, and its diameter L3 is, for example, 1 mm.

  As another embodiment of the present invention, the central portion 1121 has a circular bottom surface instead of the circular shape, and a conical side surface protruding from the bottom surface toward the LED chip 111a. You may make it a shape.

  The central portion 1121 is formed to irradiate light to a region facing the central portion 1121 in the diffusing plate 3 that is an object to be irradiated. However, since the central portion 1121 is a portion facing the LED chip 111a, most of the light emitted from the LED chip 111a reaches the central portion 1121, and when most of the light is transmitted as it is, it faces the central portion 1121. The illuminance of the area to be markedly increased. Therefore, it is preferable that the shape of the central portion 1121 is the side shape of the cone. In the case of the conical side surface shape, most of the light is reflected by the central portion 1121 and less light is transmitted through the central portion 1121, so that the illuminance of the region facing the central portion 1121 can be suppressed.

  The first curved portion 1122 is connected to the outer peripheral edge of the central portion 1121 and extends outward in one direction of the LED chip 111a in the optical axis S direction (direction toward the liquid crystal panel 2). It is an annular curved surface curved so as to be convex. The shape of this curved surface is designed so that the light emitted from the LED chip 111a is totally reflected.

  More specifically, of the light emitted from the LED chip 111a, the light that has reached the first curved portion 1122 is totally reflected by the first curved portion 1122, and then passes through the side surface 112b of the lens 112, thereby reflecting the reflecting member 113. Head to. The light that has reached the reflecting member 113 is diffused by the reflecting member 113, and is irradiated on a region that is not opposed to the LED chip 111a in the diffusing plate 3 that is an object to be irradiated. Thereby, the irradiation light quantity to the area | region which is not facing LED chip 111a can be increased.

  The first curved portion 1122 is formed such that the incident angle of the light emitted from the LED chip 111a is equal to or greater than the critical angle φ in order to totally reflect the light emitted from the LED chip 111a. For example, when the lens 112 is made of an acrylic resin, the refractive index of the acrylic resin is “1.49” and the refractive index of air is “1”, so sinφ = 1 / 1.49. From this equation, the critical angle φ is 42.1 °, and the first curved portion 1122 is formed in a shape with an incident angle of 42.1 ° or more. For example, when the lens 112 is made of silicon resin, the refractive index of silicon resin is “1.43” and the refractive index of air is “1”, so sinφ = 1 / 1.43. . From this equation, the critical angle φ is 44.4 °, and the first curved portion 1122 is formed in a shape with an incident angle of 44.4 ° or more.

  The second curved portion 1123 is connected to the outer peripheral edge portion of the first curved portion 1122, extends toward the other side in the optical axis S direction of the LED chip 111a, and protrudes to one side in the optical axis S direction. It is a curved annular curved surface.

  Of the light emitted from the LED chip 111 a, the light that has reached the second curved portion 1123 is refracted and travels toward the diffuser plate 3 and the reflecting member 113 when passing through the second curved portion 1123. The light reaching the reflection member 113 is diffused and travels toward the diffusion plate 3. Thus, the light traveling toward the diffusion plate 3 by the second curved portion 1123 is mainly irradiated to a region different from the region irradiated with light by the central portion 1121 and the first curved portion 1122 in the diffusion plate 3. The amount of light is complemented. Since the second curved portion 1123 needs to transmit light, the incident angle is less than 42.1 ° so as not to totally reflect the light emitted from the LED chip 111a.

  As described above, the lens 112 is formed with the first curved portion 1122 that totally reflects the light emitted from the LED chip 111a toward the side surface 112b of the lens 112 at the outer peripheral edge portion of the central portion 1121. A second curved portion 1123 that refracts the light emitted from the LED chip 111a is formed at the outer peripheral edge of the curved portion 1122.

  The LED chip 111a generally has high directivity, the amount of light near the optical axis S is extremely large, and the amount of light decreases as the light emission angle with respect to the optical axis S increases. Therefore, in order to increase the amount of light emitted to the region relatively far from the optical axis S of the LED chip 111a (that is, the optical axis of the lens 112), light having a large emission angle with respect to the optical axis S is directed to this region. Instead, it is necessary to direct light having a small emission angle to this region.

  In the present embodiment, as described above, the first curved portion 1122 that totally reflects light toward the region is formed around the central portion 1121 through which the optical axis S passes. The amount of irradiation light can be increased.

  On the other hand, if the second curved portion 1123 is formed adjacent to the periphery of the central portion 1121, and the first curved portion 1122 is formed adjacent to the second curved portion 1123, The emission angle of the light toward the first curved portion 1122 with respect to the optical axis S increases, and as a result, the amount of light that is totally reflected by the first curved portion 1122 and applied to the region is reduced. As a result, the luminance in the diffusion plate 3 becomes non-uniform.

  FIG. 7 is a diagram for explaining an optical path of light emitted from the LED chip 111a. Light emitted from the LED chip 111 a enters the lens 112 and is diffused by the lens 112. Specifically, of the light incident on the lens 112, the light that has reached the central portion 1121 on the upper surface 112 a facing the liquid crystal panel 2 through the diffusion plate 3 is emitted in the direction of the arrow A 1 toward the liquid crystal panel 2. The light reaching the first curved portion 1122 is totally reflected and emitted from the side surface 112b in the direction of the arrow A2, and the light reaching the second curved portion 1123 is outward (a direction away from the LED chip 111a). The light is refracted and emitted toward the liquid crystal panel 2 in the direction of the arrow A3.

  In the present embodiment, the LED chip 111a and the lens 112 have the same optical axis, that is, the center of the lens 112 (that is, the optical axis of the lens 112) is positioned on the optical axis S of the LED chip 111a. In addition, the lens 112 is preliminarily aligned with high accuracy so as to contact the LED chip 111a.

  As a method of forming the LED chip 111a and the lens 112 by aligning them in advance, insert molding, a method of fitting the LED chip 111a supported by the base 111 to the lens 112 molded into a predetermined shape, etc. Can be mentioned. In the present embodiment, the LED chip 111a and the lens 112 are formed by being previously aligned by insert molding.

  When insert molding is performed, an upper surface mold and a lower surface mold are roughly used. Molding is performed by injecting a resin, which is a raw material of the lens 112, from a resin inlet into a space formed when the upper surface mold and the lower surface mold are combined. In addition, in a state where the LED chip 111a supported by the base 111 is held in a space formed when the upper surface mold and the lower surface mold are combined, a resin as a raw material of the lens 112 is injected from the resin injection port. You may make it shape | mold by doing.

  Thus, by forming the LED chip 111a and the lens 112 by insert molding, it is possible to align the lens 112 with high accuracy so that the lens 112 contacts the LED chip 111a.

  Thus, the backlight unit 1 can accurately reflect and refract the light emitted from the LED chip 111a through the lens 112 by the lens 112 in contact with the LED chip 111a. Even in the thinned liquid crystal display device 100 in which the distance H3 to the substrate 12 is small, the liquid crystal panel 2 can be irradiated with light through the diffusion plate 3 so that the luminance is uniform in the surface direction.

  Returning to FIGS. 2 and 3, the light emitting unit 11 includes a reflecting member 113. The reflecting member 113 is provided around the base 111 on which the LED chip 111 a is supported, and reflects the light emitted from the lens 112 toward the liquid crystal panel 2 through the diffusion plate 3. The reflection member 113 has a polygonal shape, for example, a square shape, when viewed from the diffuser 3 side, that is, when viewed in plan in the direction of the optical axis S of the LED chip 111a.

  In addition, when the reflecting member 113 is viewed in plan in the optical axis S direction of the LED chip 111a, each side of the outer peripheral shape is continuous with the adjacent reflecting member 113. Thereby, in the adjacent light emission part 11, since the distance between LED chip 111a becomes the same, the brightness | luminance uniformity in the light irradiation surface of the diffusion plate 3 can be improved more.

  The reflecting member 113 is a flat plate-like base portion having an opening at the center, specifically, a square flat plate-like base portion 1131 having a side length of 38.8 mm, and an outer peripheral edge portion surrounding the base portion 1131. And an inclined portion 1132 that is formed to be inclined so as to move away from the printed circuit board 12 as the distance from the LED chip 111a increases. The reflecting member 113 configured by the base portion 1131 and the inclined portion 1132 is provided in an inverted dome shape with the LED chip 111a as the center.

  In the present embodiment, the reflecting member 113 has a square outer peripheral shape when viewed in plan in the direction of the optical axis S of the LED chip 111a, and is configured to be line-symmetric with respect to the square diagonal line. Further, the center point of the square shape is configured to be 90 ° rotationally symmetric.

  The base 1131 is such that each side of the square shape when viewed in plan in the direction of the optical axis S of the LED chip 111a is in a matrix, that is, parallel to the row direction or column direction of the plurality of LED chips 111a arranged in alignment. Formed. The base 1131 is formed along the printed circuit board 12 and has a circular opening at the center when viewed in plan in the direction of the optical axis S. The diameter of the circular opening is set to be slightly smaller than the diameter L2 of the lens 112, and the lens 112 is inserted through this opening.

  The inclined portion 1132 is connected to each side portion of the outer peripheral shape of the base portion 1131 and extends while being inclined so as to be separated from the printed circuit board 12 as it goes outward (in a direction away from the LED chip 111a). An inclination angle θ1 between the inclined portion 1132 and the printed circuit board 12 is, for example, 80 °. Further, the height H2 of the inclined portion 1132 in the direction of the optical axis S is, for example, 4 mm.

  In the present embodiment, a gap G is formed between the diffusion plate 3 and the far end of the reflecting member 113 with respect to the printed circuit board 12, that is, the tip of the inclined portion 1132 on the diffusion plate 3 side in the optical axis S direction. Is formed. In the light emitting unit 11, the amount of light tends to decrease as the distance from the LED chip 111a increases in the surface direction. By forming the gap G, a part of the light emitted from each other between the adjacent light emitting portions 11 can enter the gap G to compensate for a decrease in the amount of light. Therefore, the uniformity of the light quantity in the surface direction can be further improved.

  The base portion 1131 and the inclined portion 1132 are made of highly bright PET (Polyethylene Terephthalate), aluminum, or the like. High-brightness PET is foamable PET containing a fluorescent agent, and examples thereof include E60V (trade name) manufactured by Toray Industries, Inc. The base portion 1131 and the inclined portion 1132 have the same thickness, for example, 0.1 to 0.5 mm.

  The reflection member 113 including the base portion 1131 and the inclined portion 1132 has a total reflectance of, for example, 80% to 100% with respect to visible light emitted from the LED chip 111a, and in this embodiment, 97%. is there. The total reflectance can be measured according to JIS-K-7375.

  The reflection members 113 configured as described above and provided in each of the plurality of light emitting units 11 are preferably formed integrally with each other. As a method of integrally molding the plurality of reflecting members 113, when the reflecting member 113 is made of high-brightness PET, extrusion molding and vacuum forming can be mentioned, and the reflecting member 113 is made of aluminum. If it is, press working can be mentioned.

  For example, when a plurality of reflecting members 113 made of high-brightness PET are integrally formed by vacuum forming, they are formed as follows.

  First, after a sheet made of high-brightness PET is softened by heating, it is fixed to the upper part of a mold having a large number of small holes (vacuum holes) for vacuum suction beforehand. Next, after the mold or sheet is moved and sealed between the sheet and the mold so that air does not leak, the internal air is rapidly removed through the vacuum hole. Since the inside of the sheet is depressurized, it is pressed onto the mold surface by atmospheric pressure, and the shape of the mold is faithfully reproduced. What was molded in this way can be taken out of the mold after cooling, and the integrally formed reflecting member 113 can be manufactured. By integrally forming the reflecting member 113 by such a processing method, the reflecting member 113 having the same thickness of the base portion 1131 and the inclined portion 1132 and having excellent thickness uniformity can be manufactured.

  By integrally forming the reflecting member 113 provided in each of the plurality of light emitting units 11, it is possible to improve the accuracy of the arrangement position of the plurality of light emitting units 11 with respect to the printed circuit board 12, and at the time of the assembly operation of the backlight unit 1, Since the number of operations for attaching the reflecting member 113 can be reduced, the efficiency of the assembly operation can be improved.

  An optical path of light emitted from the LED chip 111a in the liquid crystal display device 100 including the backlight unit 1 configured as described above will be described with reference to FIG.

  In the backlight unit 1, of the light emitted from the LED chip 111 a and incident on the lens 112, the light reaching the central portion 1121 on the upper surface 112 a facing the liquid crystal panel 2 through the diffusion plate 3 is transmitted to the liquid crystal panel 2. The light emitted toward the arrow A1 and reaching the first curved portion 1122 is reflected and emitted from the side surface 112b in the arrow A2 direction, and the light reaching the second curved portion 1123 is refracted outward. Then, it is emitted toward the liquid crystal panel 2 in the direction of the arrow A3.

  Of the light emitted from the lens 112, the light emitted from the side surface 112 b (light whose emission direction intersects the optical axis S) is incident on the inclined portion 1132 of the reflecting member 113. The inclined portion 1132 of the reflecting member 113 extends away from the printed circuit board 12 as it goes outward (in the direction away from the LED chip 111a), so that the light incident on the inclined section 1132 is parallel to the printed circuit board 12. The amount of light in the region corresponding to the inclined portion 1132 in the surface direction can be increased.

  Next, a configuration for radiating heat generated from the LED chip 111a, which is a characteristic configuration in the backlight unit 1 of the present embodiment, will be described.

  FIG. 8 is a diagram for explaining how heat generated from the LED chip 111a is dissipated. FIG. 8 is an enlarged view showing only two adjacent light emitting units 11 in the backlight unit 1.

  In the backlight unit 1 of the present embodiment, a first heat radiation space 41 is formed between the bottom 131 of the frame member 13 and the reflection member 113 between the adjacent reflection members 113. Specifically, the first heat radiating space 41 is between the bottom 131 of the frame member 13 and the inclined portion 1132 of the reflecting member 113, that is, the outer peripheral edge of the inclined portion 1132 that is continuous with each other between the adjacent reflecting members 113. , Corresponding to each side of the outer peripheral shape.

  In the present embodiment, the first heat radiating space 41 is realized by a space portion surrounded by the inclined portion 1132 and the bottom portion 131 of the frame member 13 that are connected to each other in the adjacent reflecting member 113, and is generated by the heat generated from the LED chip 111a. It becomes the flow path of the air current.

  The heat generated when the LED chip 111a emits light is conducted through the reflecting member 113 and the printed circuit board 12, and the LED chip 111a such as air existing between the reflecting member 113 and the bottom 131 of the frame member 13 is transmitted. Warm the air around you. In the backlight unit 1 of the present embodiment, the space surrounded by the inclined portion 1132 and the bottom portion 131 of the frame member 13 in the adjacent reflecting member 113 is the first heat radiation space 41, so that the LED chip The heated air existing around 111a flows through the first heat radiation space 41 by forming an air flow without staying. Therefore, heat can be efficiently radiated without heat remaining in the backlight unit 1.

  Further, since the first heat radiation space 41 is formed by a space portion surrounded by the inclined portion 1132 and the bottom portion 131 of the frame member 13 in the adjacent reflection member 113, the first heat radiation space 41 and the bottom portion 131 of the reflection member 113 are separated from each other. The airflow flowing through the first heat radiating space 41 does not flow into the region opposite to the opposite side, that is, the region on the light irradiation surface side of the diffusion plate 3. Therefore, it is possible to efficiently dissipate heat while preventing foreign matters such as dust from flowing into the region on the light irradiation surface side of the diffusion plate 3 on the airflow.

  9 and 10 are diagrams for explaining how heat generated from the LED chip 111a is dissipated when the backlight unit 1 is arranged so that the longitudinal direction of the printed circuit board 12 coincides with the vertical direction. is there.

  In the present embodiment, the light emitting units 11 are arranged in a matrix by arranging the printed circuit boards 12 provided with a plurality of light emitting units 11 having the same shape and size at equal intervals in the long side direction of the bottom 131 of the frame member 13. Is provided. The reflecting member 113 provided in each of the plurality of light emitting units 11 has a square outer peripheral shape when viewed in plan, and each side of the outer peripheral shape corresponding to the outer peripheral edge of the inclined portion 1132 is adjacent. The reflection members 113 are connected to each other. In the backlight unit 1 including the light emitting unit 11 having such a configuration, as illustrated in FIG. 9, a space portion surrounded by the inclined portion 1132 and the bottom portion 131 of the frame member 13 that are adjacent to each other in the adjacent reflecting member 113. The formed first heat radiation space 41 is communicated, and is parallel to the short side of the bottom portion 131 of the frame member 13, that is, parallel to the longitudinal direction of the printed circuit board 12, between both ends in the short side direction of the bottom portion 131 of the frame member 13. A plurality of flow paths extending along a straight line and parallel to the long side of the bottom portion 131, that is, perpendicular to the longitudinal direction of the printed circuit board 12, and extending along a straight line extending between both ends in the long side direction of the bottom portion 131. Are formed in a lattice shape.

  In the backlight unit 1 configured as described above, in other words, the surface of the inclined portion 1132 that is continuous with each other in the adjacent reflecting member 113 faces the first heat radiation space 41 is the long side or the short side of the bottom portion 131 of the frame member 13. And extend along a straight line. As a result, the first heat radiation space 41 extends along a straight line, and a plurality of flow paths extending along the straight line extending between both ends in the short side direction or between both ends in the long side direction of the bottom 131 of the frame member 13 are in a lattice shape. Formed.

  When the backlight unit 1 is arranged so that the longitudinal direction of the printed circuit board 12, that is, the short side direction of the bottom 131 of the frame member 13 coincides with the vertical direction, the first heat radiating space 41 is communicated. A plurality of flow paths parallel to the longitudinal direction of the printed circuit board 12 and extending between both ends of the short side direction of the bottom 131 are formed to extend linearly in the vertical direction. In such a case, the air generated from the LED chip 111a and heated by the heat conducted through the reflecting member 113 and the printed circuit board 12 forms a rising airflow along the vertical direction, and both ends of the bottom 131 in the short side direction. It flows smoothly through the flow path formed by the first heat radiation space 41. Therefore, heat can be efficiently radiated without heat remaining in the backlight unit 1.

  11 and 12 are diagrams for explaining how heat generated from the LED chip 111a is dissipated when the backlight unit 1 is arranged so that the longitudinal direction of the printed circuit board 12 coincides with the horizontal direction. is there.

  When the backlight unit 1 is arranged so that the longitudinal direction of the printed board 12, that is, the long side direction of the bottom 131 of the frame member 13 coincides with the horizontal direction, the first heat radiation space 41 is communicated. A plurality of flow paths that are perpendicular to the longitudinal direction of the printed circuit board 12 and extend between both ends in the long side direction of the bottom portion 131 are formed to extend linearly in the vertical direction.

  In such a case, the air generated from the LED chip 111a and heated by the heat conducted through the reflecting member 113 and the printed circuit board 12 forms a rising airflow along the vertical direction, and both ends of the bottom 131 in the long side direction. It flows smoothly through the flow path formed by the first heat radiation space 41. Therefore, heat can be efficiently radiated without heat remaining in the backlight unit 1.

  FIG. 13 is a diagram for explaining the heat transfer portion 51 formed on the back surface of the reflecting member 113.

  In the reflecting member 113 provided in the backlight unit 1, at least a part of the base 1131 except for the opening 113 a on the surface (back surface) facing the bottom 131 of the frame member 13 and the bottom 131 of the inclined portion 1132. It is preferable that a heat transfer portion 51 that transmits heat generated from the LED chip 111a to the first heat radiation space 41 is formed on the surface (back surface) on the side to be performed. The heat transfer part 51 is made of a material having thermal conductivity. Examples of the material constituting the heat transfer unit 51 include metal materials such as aluminum.

  Since the heat transfer portion 51 is formed on the surface of the reflection member 113 on the side facing the bottom portion 131 of the frame member 13, the heat generated from the LED chip 111 a is transferred through the heat transfer portion 51 having heat conductivity. Therefore, heat can be efficiently radiated.

  FIG. 14 is a diagram illustrating a configuration of the backlight unit 60. FIG. 14 is an enlarged view showing only two light emitting units 60 a adjacent to each other in the backlight unit 60. The backlight unit 60 of the present embodiment is similar to the backlight unit 1 described above, and corresponding portions are denoted by the same reference numerals and description thereof is omitted. The backlight unit 60 is the same as the backlight unit 1 except that the configuration of the light emitting unit 60a is different from the configuration of the light emitting unit 11 described above.

  Each of the plurality of light emitting units 60a includes an LED chip 111a, a base 111 that supports the LED chip 111a, a lens 112, and a reflecting member 61.

  The reflection member 61 is provided around the base 111 on which the LED chip 111 a is supported, and reflects the light emitted from the lens 112 toward the liquid crystal panel 2 through the diffusion plate 3. The reflection member 61 has a polygonal shape, for example, a square shape, when viewed from the diffuser 3 side, that is, when viewed in plan in the direction of the optical axis S of the LED chip 111a.

  Moreover, when the reflection member 61 is planarly viewed in the optical axis S direction of the LED chip 111a, each side portion of the outer peripheral shape is continuous with the adjacent reflection member 61.

  The reflection member 61 is a base 611 having an opening at the center, and an outer peripheral edge that surrounds the base 611, and an inclined portion 612 that is formed to be inclined so as to move away from the printed circuit board 12 as the distance from the LED chip 111 a increases. Have The reflecting member 61 constituted by the base 611 and the inclined portion 612 is provided in an inverted dome shape with the LED chip 111a as the center.

  A characteristic configuration of the reflecting member 61 is that the base 611 protrudes between the lens 112 covering the LED chip 111a and each inclined portion 612 while being spaced apart from the printed board 12 on the light irradiation surface side of the diffusion plate 3, And having raised portions 6111 extending from the lens 112 to the respective inclined portions 612. Each raised portion 6111 is formed in a triangular pyramid shape having a reflecting surface that reflects incident light toward directly above corners where adjacent side portions of the outer peripheral shape of the reflecting member 61 are connected to each other. Thereby, the light emitted from the LED chip 111a via the lens 112 can be reflected by the raised portion 6111 toward the corner portion, so that the amount of irradiation light can be made uniform in the surface direction.

  In the backlight unit 60 of the present embodiment, the first heat radiation space 41 is formed between the bottom 131 of the frame member 13 and the reflection member 61 between the adjacent reflection members 61. Specifically, the first heat radiating space 41 is located between the bottom 131 of the frame member 13 and the inclined portion 612 of the reflecting member 61, that is, the outer peripheral edge of the inclined portion 612 that is continuous with the adjacent reflecting members 61, that is, It is formed corresponding to each side part of the outer peripheral shape. In the present embodiment, the first heat radiation space 41 is realized by a space portion surrounded by the inclined portion 612 and the bottom portion 131 of the frame member 13 in the adjacent reflection member 61, and the heat generated from the LED chip 111a. It becomes the flow path of the airflow by.

  Further, the backlight unit 60 has a second heat radiation space 62 formed between the bottom 131 of the frame member 13 and the reflection member 61 so as to continue from the lens 112 covering the LED chip 111 a to the first heat radiation space 41. Yes. The second heat radiating space 62 is realized by a space surrounded by the raised portion 6111 and the bottom 131 of the frame member 13, and becomes a flow path that guides the air flow generated by the heat generated from the LED chip 111 a to the first heat radiating space 41. . As a result, the air heated by the heat generated from the LED chip 111a can be guided to the first heat radiation space 41 via the second heat radiation space 62, so that heat can be efficiently radiated.

  Also in the backlight unit 60 of the present embodiment, similarly to the backlight unit 1 described above, at least one of the reflecting members 61 except for the opening on the surface of the base 611 facing the bottom 131 of the frame member 13. The heat transfer portion 51 can be formed on the surface of the inclined portion 612 that faces the bottom 131 and the surface of the raised portion 6111 that constitutes the second heat radiation space 62 that faces the bottom 131. Accordingly, the heat generated from the LED chip 111a can be transmitted to the first heat radiation space 41 and the second heat radiation space 62 via the heat transfer portion 51 having thermal conductivity, so that heat can be efficiently radiated.

DESCRIPTION OF SYMBOLS 1,60 Backlight unit 2 Liquid crystal panel 3 Diffusion plate 11, 60a Light emission part 12 Printed circuit board 13 Frame member 41 1st thermal radiation space 62 2nd thermal radiation space 100 Liquid crystal display device 111 Base 111a LED chip 112 Lens 61,113 Reflection member

Claims (8)

A housing composed of a frame portion and a rectangular plate-shaped bottom portion surrounded by the frame portion;
A plurality of substrates housed in the housing and arranged at equal intervals on the bottom;
A plurality of light emitting elements arranged in alignment on each of the substrates and emitting light;
A plurality of reflections having a flat base portion provided on each substrate so as to surround each of the plurality of light emitting elements disposed on each substrate, and an inclined portion extending obliquely from an outer peripheral edge of the base portion. A plurality of reflecting members, wherein the outer peripheral edge ends of the inclined portions are connected to each other between adjacent reflecting members,
A light-emitting device, wherein a space surrounded by the inclined portion and the bottom portion that are connected to each other serves as a first heat-dissipating space for dissipating heat generated from the light-emitting element.   The light emitting device according to claim 1, wherein the base portion and the inclined portion are formed to have the same thickness. The reflecting member has a polygonal outer peripheral shape when viewed in plan, and each side part of the outer peripheral shape corresponding to the outer peripheral edge of the inclined portion is connected by adjacent reflecting members,
The said 1st thermal radiation space is formed corresponding to each edge part of the outer periphery shape continued by adjacent reflective members between the said bottom part and the said inclination part, The Claim 1 or 2 characterized by the above-mentioned. Light-emitting device.   A heat transfer portion having heat conductivity for transferring heat generated from the light emitting element to the first heat radiating space is formed on a surface of the base portion and the inclined portion facing the bottom portion. The light-emitting device according to any one of claims 1 to 3.   5. The light-emitting device according to claim 1, wherein surfaces of the inclined portions that are continuous with each other in the adjacent reflecting members extend along a straight line.   6. The light emitting device according to claim 5, wherein surfaces of the inclined portions that are connected to each other in the adjacent reflecting members face the first heat radiation space extend in parallel with a long side or a short side of the bottom portion. The base portion protrudes away from the substrate, and has a raised portion that continues to the inclined portion,
The space surrounded by the raised portion and the bottom portion becomes a second heat radiation space that guides an air flow caused by heat generated from the light emitting element to the first heat radiation space. The light emitting device according to one. A display panel;
A light emitting device for irradiating light on the back of the display panel;
The display device according to claim 1, wherein the light-emitting device is the light-emitting device according to claim 1.

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