JP2009259548A - Display device and light-emitting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To restrain detention of heat generated at each light-emitting part, in case a light-emitting device is structured by arraying a plurality of light-emitting modules each having a light-emitting part. <P>SOLUTION: A display device is provided with a display panel carrying out image display, and a backlight device fitted at a rear face of the display panel for irradiating light from the rear face of the display panel, for use in an erected state. The backlight device includes a backlight frame 31 extended in a longitudinal direction V with the display device in an erected state, and a plurality of light-emitting modules 40a, 40b fitted in a longitudinal direction V together with the backlight frame 31. The light-emitting module 40a, for instance, is equipped with a light-emitting part 41 emitting light upward from bottom with the display device in an erected state, and a reflecting plate 44 having a slanted face slanted in a direction getting away from the backlight frame 31 as it is headed upward and reflecting light from the light-emitting part 41 toward the display panel. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a display device and a light emitting device for displaying an image.

For example, in a display device such as a liquid crystal display device typified by a liquid crystal television or a liquid crystal monitor, a light emitting device called a backlight device is employed to irradiate light from the back surface of the display panel.
As this type of backlight device, for example, there is one in which a plurality of light sources are arranged on the back surface of a liquid crystal panel. As such a backlight device, a plurality of linear light sources are arranged side by side on the back side of the liquid crystal panel, and the surface closer to the liquid crystal panel is closer than the far side surface between two adjacent light sources. A large trapezoidal light guide plate is provided, and a light source for irradiating light to the inclined surface of the light guide plate is installed in one wedge-shaped storage space of the light guide plate formed in a trapezoidal shape. There has been proposed a technique for attaching a heat conducting member for discharging heat discharged from another light source that irradiates light to an inclined surface of another light guide plate adjacent to the other wedge-shaped storage space (Patent Document 1). reference.).

JP 2005-327664 A

By the way, in order to stabilize the amount of light emitted from the backlight device, it is preferable to increase the efficiency of releasing heat generated by the light source. For example, in addition to the above-described heat conducting member, heat is also directly emitted from the light source into the air. Is preferably released.
However, for example, when a light guide plate is present, the heat generated by the light source is blocked by the light guide plate, making it difficult for heat to escape. Further, even if a member other than the light guide plate is used, a heat retaining member or a retaining structure is employed in the vicinity of the light source.

  An object of the present invention is to suppress the retention of heat generated in each light emitting unit when a light emitting device is configured by arranging a plurality of light emitting modules each having a light emitting unit.

  For this purpose, the present invention includes a display panel that displays an image, and a backlight device that is provided on the back of the display panel and emits light from the back of the display panel, and is used in a standing state. The backlight device includes a frame extending in a vertical direction in a state where the display device is erected, and a plurality of light emitting modules provided in the vertical direction of the frame, and the light emitting module includes the display device. A light emitting unit that emits light from below to above in a standing state, and an inclined surface that inclines in a direction approaching the display panel as it goes upward, and directs light from the light emitting unit toward the display panel It is characterized by comprising a reflecting member that reflects.

  In such a display device, the light emitting unit may include a plurality of solid state light emitting elements arranged in a direction crossing the vertical direction. The light-emitting unit includes a plate-like substrate having a plurality of light-emitting elements attached to the surface, and the light-emitting module is in contact with the side surface of the plate-like substrate so that the plate-like substrate is erected and is electrically connected to the plate-like substrate. It may further include a wiring board on which the light emitting elements are arranged facing upward in a connected state. In this case, the wiring board can be arranged behind the reflecting member as viewed from the display panel. Further, the reflecting member includes a first reflecting portion disposed in parallel with the surface of the display panel from the position where the light emitting portion is placed, and a display panel facing upward from an upper end portion of the first reflecting portion. And a second reflecting portion that is disposed to be inclined toward the side approaching. The light emitting module may further include a light blocking member that is disposed on the near side of the light emitting unit as viewed from the display panel and blocks light from the light emitting unit toward the display panel.

  From another point of view, the present invention is a light emitting device used in an upright state, the frame extending in the vertical direction in the state in which the light emitting device is erected, and the vertical direction of the frame. The light emitting module includes a light emitting unit that emits light from below to above in a state where the light emitting device is erected, and an inclination that is inclined away from the frame as it goes upward And a reflection member that reflects light from the light emitting portion toward the opposite side of the frame.

  In such a light-emitting device, the light-emitting unit includes a plate-like substrate having a plurality of light-emitting elements attached to the surface, and the light-emitting module contacts the side surface of the plate-like substrate to stand the plate-like substrate and The wiring board may further include a wiring board in which the light emitting element is disposed upward while being electrically connected to the board.

  According to the present invention, when a plurality of light emitting modules each having a light emitting unit are arranged to constitute a light emitting device, it is possible to suppress stagnation of heat generated in each light emitting unit.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 is a diagram showing an overall configuration of a liquid crystal display device to which the present embodiment is applied.
The liquid crystal display device includes a liquid crystal display module 20 and a backlight device 10 provided on the back side (lower side in FIG. 1) of the liquid crystal display module 20. In addition, although this liquid crystal display device is actually used standing, in FIG. 1, the vertical direction V and the horizontal direction H at the time of using a liquid crystal display device are shown by the arrow. Note that the liquid crystal display device according to the present embodiment has a horizontally long shape in which the horizontal direction H is larger than the vertical direction V, but may have a vertically long configuration.

  Among these, the backlight device 10 includes a light source device 11 that irradiates light toward the liquid crystal display module 20 and an optical film having optical transparency with respect to visible light, and the entire surface has uniform brightness. For this purpose, a diffusing plate (plate or film) 12 that scatters and diffuses light and prism sheets 13 and 14 that are diffraction grating films having a forward light condensing effect are provided. Further, the backlight device 10 is provided with a diffusion / reflection type brightness enhancement film 15 for improving the brightness, if necessary.

  On the other hand, the liquid crystal display module 20 is laminated on a liquid crystal panel 21 as a display panel configured by sandwiching liquid crystal between two glass substrates, and each glass substrate of the liquid crystal panel 21, and the vibration of the light wave is predetermined. Polarizing plates 22 and 23 for limiting the direction are provided. Furthermore, peripheral members such as a driving LSI (not shown) are also attached to the liquid crystal display module 20.

The liquid crystal panel 21 includes various components not shown. For example, two glass substrates are provided with a display electrode (not shown), an active element such as a thin film transistor (TFT), a liquid crystal, a spacer, a sealant, an alignment film, a common electrode, a protective film, a color filter, and the like. Yes.
The structural unit of the backlight device 10 is arbitrarily selected. For example, there may be a distribution form in which only the light source device 11 is called a “backlight device” and does not include the diffusion plate 12, the prism sheets 13 and 14, the brightness enhancement film 15, and the like.

  FIG. 2 is a diagram for explaining the configuration of the light source device 11, and shows a top view of the light source device 11 as viewed from the upper side of FIG. In the present embodiment, a backlight structure is employed in which the light source device 11 is disposed immediately below the back surface of the liquid crystal display module 20. Further, the backlight device 10 according to the present embodiment does not include a so-called light guide plate (light guide) as described later.

  The light source device 11 includes a backlight frame 31 as an example of a frame that opens toward the front side in the figure, a light emitting device 32 that is housed in the backlight frame 31 and emits light toward the front side in the figure, and A power supply cable 33 that supplies power to the light emitting device 32 from an external power source that is not connected.

  The backlight frame 31 has a housing structure formed of, for example, aluminum, magnesium, iron, or a metal alloy containing them. As such a housing structure, the backlight frame 31 is provided corresponding to the size of the liquid crystal display module 20, and has a back surface portion extending in the vertical direction V and the horizontal direction H, and a side surface portion surrounding the four corners of the back surface portion. It has. And the white polyester film etc. are stuck on the inner side surface part of the housing | casing structure, for example, and it functions also as a reflector. Here, “extending in the vertical direction V” means that the back surface portion of the backlight frame 31 has a height in the vertical direction when the liquid crystal display device is erected.

The light emitting device 32 includes light emitting modules 40 a to 40 e that extend in the horizontal direction H and are arranged in a plurality (five in the present embodiment) in the vertical direction V. Here, in the case where the liquid crystal display device shown in FIG. 1 is erected, the light emitting module 40a is positioned at the lowermost vertical direction (Bottom side), and the light emitting module 40e is positioned at the uppermost vertical direction (Top side). It has become. Further, as will be described later, each of the light emitting modules 40a to 40e emits light from the bottom side toward the top side, and reflects the emitted light toward the front side in the figure. .
The power supply cable 33 is configured by a flexible flat cable that can be folded, and is provided inside the backlight frame 31 and on the right side in the drawing. One end side of the power supply cable 33 is connected to a connector (not shown) for receiving power from the outside of the light source device 11, and the other end side is connected to a connector 43 provided in the light emitting modules 40a to 40e. .

Next, the configuration of the light emitting modules 40a to 40e will be described by taking the light emitting module 40a as an example with reference to FIGS.
3 is a perspective view of the light emitting module 40a, FIG. 4A is a top view of the light emitting module 40a viewed from the same direction as FIG. 2, and FIG. 4B is a diagram of the light emitting module 40a shown in FIG. IVB-IVB sectional views are shown respectively.

  The light emitting module 40a has a plurality of light emitting diodes (referred to as LEDs in the following description: not shown) arranged along the horizontal direction H, and emits light in the vertical direction V, that is, from the bottom side to the top side. The light emitting unit 41 and the wiring substrate 42 that is attached to the light emitting unit 41 to support the light emitting unit 41 and includes an electrical path for supplying power to the plurality of LEDs of the light emitting unit 41 are provided. Here, the wiring board 42 has an L-shaped shape including a main body portion extending along the horizontal direction H and a protruding portion extending in the vertical direction V on one end side (front side in FIG. 3) of the main body portion. ing. The light emitting unit 41 is attached to the bottom side of the wiring board 42. However, in the present embodiment, the wiring board 42 slightly protrudes from the mounting position of the light emitting unit 41 to the bottom side. The light emitting module 40 a is further provided with two connectors 43 that are attached to the end portion in the lateral direction H of the protruding portion of the wiring board 42 and connect the electrical path provided on the wiring board 42 and the power supply cable 33.

  The light emitting module 40a is fixed to the mounting surface side of the light emitting unit 41 in the wiring board 42, and is an example of a reflecting member that reflects light emitted from the light emitting unit 41 toward the diffusion plate 12 (see FIG. 1). A light-shielding unit that is fixedly attached to the light-emitting unit 41 so as to sandwich the light-emitting unit 41 between the reflecting plate 44 and the wiring board 42, and that blocks light traveling directly from the light-emitting unit 41 toward the diffusion plate 12 (see FIG. 1). A light shielding plate 45 as an example of a member is further provided.

The reflection plate 44 includes a rectangular first reflection portion 44a and a rectangular second reflection portion 44b that is inclined and extended from one long side of the first reflection portion 44a. Here, the first reflecting portion 44 a is disposed on the top surface side of the light emitting portion 41 on the attachment surface side of the light emitting portion 41 of the wiring board 42, and the long side thereof is along the horizontal direction H. Thereby, in the light emitting module 40a, the wiring board 42 and the 1st reflection part 44a oppose, and both are being fixed by adhesion | attachment. Further, the second reflecting portion 44b is disposed to be inclined from the top side of the first reflecting portion 44a to the side that blocks the light path of the light emitting portion 41. As a result, as shown in FIG. 4B, when the light emitting module 40a is attached to the backlight frame 31 indicated by the broken line, the Top is interposed between the backlight frame 31 and the second reflecting portion 44b of the reflecting plate 44. A wedge-shaped space S having an open side is formed. The backlight frame 31 includes a groove in which the wiring board 42 is embedded when the light emitting module 40a is attached.
The light shielding plate 45 has a rectangular shape and is attached in parallel to the first reflecting portion 44 a of the reflecting plate 44. A white reflective layer is formed on the surface of the light shielding plate 45 facing the light emitting portion 41.

  The light emitting unit 41 includes 42 light emitting units 50 arranged in a line along the horizontal direction H. Each light emitting unit 50 includes four LEDs arranged in a line along the horizontal direction H. 2 and 4A, the light emitting unit 41 (light emitting unit 50) is hidden behind the light shielding plate 45.

Next, the configuration of the light emitting unit 50 will be described.
5A is a front view of the light emitting unit 50 viewed from the Top side, FIG. 5C is a rear view of the light emitting unit 50 viewed from the Bottom side, and FIG. 5D is a side view of the light emitting unit 50. Respectively. FIG. 5B shows a front view of the plate-like substrate 51 constituting the light emitting unit 50 as viewed from the Top side.

  The light emitting unit 50 includes a rectangular plate-shaped substrate 51 and four LEDs 52 that are mounted side by side on a top-side surface (referred to as a surface in the following description) of the plate-shaped substrate 51. In addition, the light emitting unit 50 includes four bullet-type lenses 54 covering each of the white resist film 53 formed on the surface of the plate-like substrate 51 and the four LEDs 52 provided on the surface of the plate-like substrate 51. And further comprising. Then, the four LEDs 52 as an example of the solid state light emitting element include, from the left in FIG. 5A, a red LED 52R that emits red light, a first green LED 52Ga that emits green light, a blue LED 52B that emits blue light, and green light. The second green LED 52Gb is emitted. With this arrangement, when the light emitting unit 41 is configured by arranging a plurality of light emitting units 50 in a line, red, green, blue, green, red, green, blue, green, red,... The LEDs 52 are arranged. That is, red and blue are alternately arranged between every other green.

  On the surface of the plate-like substrate 51, in order from the left in FIG. 5B, the red surface positive electrode 61a, the red die pad 71, the red surface negative electrode 62a, the first green surface positive electrode 63a, and the first green Die pad 72, first green surface negative electrode 64a, blue surface positive electrode 65a, blue die pad 73, blue surface negative electrode 66a, second green surface positive electrode 67a, second green die pad 74, second A green surface negative electrode 68a is provided. 5A, the red die pad 71 has a red LED 52R, the first green die pad 72 has a first green LED 52Ga, the blue die pad 73 has a blue LED 52B, and the second green. The second green LEDs 52Gb are attached to the die pads 74, respectively. The red LED 52R is a red surface positive electrode 61a and a red surface negative electrode 62a, the first green LED 52Ga is a first green surface positive electrode 63a and a first green surface negative electrode 64a, and the blue LED 52B is a blue surface. The positive electrode 65a and the blue surface negative electrode 66a, and the second green LED 52Gb are electrically connected to the second green surface positive electrode 67a and the second green surface negative electrode 68a via metal wires (not shown), respectively. Connected.

  On the other hand, on the bottom side surface (referred to as the back surface in the following description) of the plate-like substrate 51, the red back surface positive electrode 61b, the red back surface negative electrode 62b, the first green, in order from the right in FIG. Back positive electrode 63b for green, first negative back electrode for green 64b, positive back electrode for blue 65b, negative back electrode for blue 66b, back positive electrode for second green 67b, negative back electrode for second green 68b. Yes. In the light emitting unit 50 according to the present embodiment, no resist film is formed on the back side of the plate-like substrate 51. As a result, the entire surface of each electrode is exposed to the outside. The red back positive electrode 61b, the red back negative electrode 62b, the first green back positive electrode 63b, the first green back negative electrode 64b, the blue back positive electrode 65b, the blue back negative electrode 66b, The widths W corresponding to the lateral direction H of the 2 green backside positive electrode 67b and the second green backside negative electrode 68b are all constant.

  Among these, the red surface positive electrode 61a and the red back positive electrode 61b are electrically connected through the metal through hole 61c, and the red surface negative electrode 62a and the red back negative electrode 62b are electrically connected through the metal through hole 62c. Connected. The first green surface positive electrode 63a and the first green back surface positive electrode 63b are connected through the metal through hole 63c, and the first green surface negative electrode 64a and the first green back surface negative electrode 64b are connected through the metal through hole 64c. Are electrically connected to each other. Further, the blue front positive electrode 65a and the blue back positive electrode 65b are electrically connected through the metal through hole 65c, and the blue front negative electrode 66a and the blue back negative electrode 66b are electrically connected through the metal through hole 66c. It is connected. Furthermore, the second green front positive electrode 67a and the second green back positive electrode 67b are connected through a metal through hole 67c, and the second green front negative electrode 68a and the second green back negative electrode 68b are metal through holes. Each is electrically connected via 68c.

  Here, in the present embodiment, the first green backside negative electrode 64b, the blue backside negative electrode 66b, and the second green backside negative electrode 68b each have an L shape, and each protrusion Extends to the position directly behind the first green die pad 72, the blue die pad 73, and the second green die pad 74. The first green die pad 72 and the first green back surface negative electrode 64b are connected through the metal through hole 72a. The blue die pad 73 and the blue back surface negative electrode 66b are connected through the metal through hole 73a. The second green die pad 74 and the second green back negative electrode 68b are electrically and thermally connected to each other through a metal through hole 74a. In addition, about these metal through holes, the metal may be filled in the hole and plating may be given to the hole wall.

  Moreover, although the plate-shaped board | substrate 51 has four side surfaces other than the surface and back surface which were mentioned above, one side surface of the long side of the plate-shaped board | substrate 51 comprises the light emitting modules 40a-40e. In this case, the wiring board mounting surface 51a is brought into contact with the wiring board 42 (see FIG. 4B). On the other hand, one side surface opposite to the wiring board mounting surface 51a is a light shielding plate mounting surface 51b that contacts the light shielding plate 45 (see FIG. 4B) when the light emitting modules 40a to 40e are configured. In the present embodiment, the side close to the formation site of each metal through hole in the plate-like substrate 51 is the light shielding plate attachment surface 51b, and the side far from the formation site of each metal through hole is the wiring board attachment surface 51a.

  Next, the wiring board 42 will be described. 6A is a front view showing a mounting surface (referred to as a surface in the following description) of the light emitting portion 41 (light emitting unit 50) of the wiring board 42, and FIG. 6B is a reflecting plate of the wiring board 42. It is a rear view which shows the attachment surface of 44 (it calls a back surface in the following description).

  The wiring board 42 includes a base made of an insulator, an electric path made of a conductor on the base, and a resist layer provided so as to cover the base and the electric path. The wiring board 42 is configured by so-called FPC (Flexible printed circuits).

  On the surface of the wiring board 42, a feeding electrode group 80 formed along the horizontal direction H on the bottom side, and two connector electrodes 89 formed on the L-shaped projecting portion side of the wiring board 42, A green heat dissipating pad 91 formed on the top side of the feeding electrode group 80 and along the horizontal direction H is provided. The power supply electrode group 80, the connector electrode 89, and the green heat dissipation pad 91 are exposed when the conductor (metal layer) provided on the surface side of the wiring board 42 is not covered with the resist layer.

  Here, as shown in an enlarged view of FIG. 6A, the feeding electrode group 80 includes a red positive electrode 81, a red negative electrode 82, a first green positive electrode 83, a first green negative electrode 84, The blue positive electrode 85, the blue negative electrode 86, the second green positive electrode 87, and the second green negative electrode 88 constitute one set, and 42 sets are arranged along the horizontal direction H. Has been. The two connector electrodes 89 are used to attach the two connectors 43 shown in FIG. Further, the green heat dissipating pad 91 is electrically connected to the 42 first green negative electrodes 84 and the 42 second green negative electrodes 88 inside the wiring substrate 42. The green heat dissipating pad 91 comes into contact with the reflecting plate 44 via an adhesive having thermal conductivity when the light emitting module 40a shown in FIG.

On the other hand, a blue heat dissipating pad 92 formed on the top side and along the horizontal direction H is provided on the back surface of the wiring board 42. The blue heat dissipating pad 92 is also exposed when the metal layer provided on the back side of the wiring board 42 is not covered with the resist layer.
Here, the blue heat dissipating pad 92 is electrically connected to the 42 blue negative electrodes 86 inside the wiring substrate 42. The blue heat dissipating pad 92 constitutes the light emitting module 40a shown in FIG. 3 and the like, and is attached to the backlight frame 31 shown in FIG. 4B through an adhesive having thermal conductivity. It comes in contact with the back surface portion of the backlight frame 31.

  When the light emitting modules 40a to 40e are configured, the light emitting unit 50 including the plate-like substrate 51 shown in FIG. 5 is mounted upright with the wiring board mounting surface 51a facing the surface of the wiring board 42. It is done. At this time, the red back positive electrode 61b and the red back negative electrode 62b provided on the plate-like substrate 51 of the light emitting unit 50 are respectively connected to the red positive electrode 81 and the red negative electrode 82 provided on the wiring substrate 42. Soldered. Also, the first green back positive electrode 63b and the first green back negative electrode 64b provided on the plate-like substrate 51 are the first green positive electrode 83 and the first green negative electrode provided on the wiring board 42, respectively. 84, respectively. The other electrodes provided on the plate-like substrate 51 are also soldered to the corresponding electrodes provided on the wiring substrate 42, respectively. Thereby, each light emitting unit 50 is positioned and fixed with respect to the wiring board 42. At this time, each electrode provided on the back surface of the plate-like substrate 51 of the light emitting unit 50 (red back positive electrode 61b, red back negative electrode 62b, first green back positive electrode 63b, first green back negative electrode 64b, the blue back positive electrode 65b, the blue back negative electrode 66b, the second green back positive electrode 67b, and the second green back negative electrode 68b) have the same width W, so that light is emitted through the solder. The force applied to the unit 50 is equal in the lateral direction H, and the positional deviation of the light emitting unit 50 with respect to the wiring board 42 is suppressed.

Subsequently, the reflector 44 will be described. Here, FIG. 7A shows a top view of the reflecting plate 44 as viewed from the upper side of FIG. 2, and FIG. 7B shows a side view of the reflecting plate 44, respectively.
The reflection plate 44 is a member in which regular reflection (specular reflection) processing using a silver vapor deposition film or the like is performed on the surface thereof, that is, the surface facing the light emitting portion 41, using a resin such as plastic as a base material. Reuil mirror made by Reiko Co., Ltd. can be used. A metal mirror that has been subjected to a bending process can also be used as the reflecting plate 44.

  In addition, on the surface side of the first reflecting portion 44 a, the absorbing member 101 is provided along the horizontal direction H on the bottom side of the first reflecting portion 44 a, that is, the side closest to the light emitting portion 41. In the present embodiment, the absorbing member 101 is configured by printing with black ink. However, for example, monotone paper may be pasted. Further, a plurality of circular dots 102 that diffusely reflect (diffuse reflection) the light incident from the light emitting unit 41 are formed on the top side of the absorbing member 101 of the first reflecting unit 44a.

  On the other hand, on the surface side, that is, the inclined surface of the second reflecting portion 44b, a plurality of circular dots 103 that diffusely reflect (diffusely reflect) light incident from the light emitting portion 41 are formed on the bottom side of the second reflecting portion 44b. Has been. Here, the dots 102 and 103 are formed by printing white ink on the reflection plate 44. Note that the dots 103 are not formed on the Top side of the positions where the dots 103 are formed on the second reflecting portion 44b. Further, the shape, size, and arrangement of the dots 102 formed on the first reflecting portion 44a and the dots 103 formed on the second reflecting portion 44b may be other than those shown in FIG. can do.

  Further, in this reflection plate 44, the angle θ formed by the extension line of the surface of the first reflection portion 44a and the second reflection portion 44b is set to be about 15 °. This angle θ is preferably 10 ° or more and 20 ° or less.

Next, the light emission operation of the backlight device 10 according to the present embodiment will be described with reference to FIGS.
A voltage is applied to the light emitting modules 40a to 40e constituting the light emitting device 32 via the power supply cable 33 by a power source (not shown). Then, for example, in the light emitting module 40a, current flows through the red LED 52R, the first green LED 52Ga, the blue LED 52B, and the second green LED 52Gb provided in each light emitting unit 50 that constitutes the light emitting unit 41. As a result, R (red), G (green), and B (blue) light is emitted toward the top side from the red LED 52R, the first green LED 52Ga, the blue LED 52B, and the second green LED 52Gb of each light emitting unit 50. . The RGB light emitted from each light emitting unit 50 toward the top side is mixed as it travels through the backlight frame 31 to become white light. The mixed white light is reflected by the reflection plate 44 and travels toward the diffusion plate 12 side. In the other light emitting modules 40b to 40e, white light emitted and mixed in the same procedure is directed toward the diffusion plate 12 side. The white light incident on the diffusion plate 12 is further mixed in color and made uniform in luminance by the diffusion plate 12, then passes through the prism sheets 13 and 14 and the luminance enhancement film 15 and is emitted toward the liquid crystal display module 20. Is done.

  Due to the nature of the diffused light, in the light emitting modules 40a to 40e, the light intensity is high in the region near the light emitting unit 41 (each light emitting unit 50), that is, the region on the bottom side, and The light intensity is reduced. On the other hand, in the present embodiment, the first reflecting portion 44a whose reflecting surface is substantially parallel to the optical axis direction of the light emitting portion 41 is positioned on the side of the reflecting plate 44 close to the light emitting portion 41, thereby diffusing the plate 12. The second reflection portion 44b that is inclined with respect to the optical axis direction of the light emitting portion 41 is positioned on the side far from the light emitting portion 41 so that the reflected light amount toward the diffusion plate 12 is increased. I have to. Moreover, the light quantity distribution of the light radiate | emitted from each light emitting module 40a-40e by setting suitably the relationship of the area of the dot 102 provided in the 1st reflection part 44a, and the dot 103 provided in the 2nd reflection part 44b. Is uniform.

  Further, with such a light emitting operation, heat is generated in the red LED 52R, the first green LED 52Ga, the blue LED 52B, and the second green LED 52Gb provided in each light emitting unit 50. At this time, for example, the heat generated in the first green LED 52Ga flows from the first green die pad 72 to the first green backside negative electrode 64b through the metal through hole 72a, and from there further the first green negative electrode 84. And flows to the reflector 44 via the green heat dissipating pad 91. Further, for example, the heat generated in the blue LED 52B flows from the blue die pad 73 to the blue back negative electrode 66b through the metal through hole 73a, and further from there through the blue negative electrode 86 and the blue heat dissipating pad 92. To the backlight frame 31. Further, for example, the heat generated by the second green LED 52Gb flows from the second green die pad 74 to the second green back negative electrode 68b through the metal through hole 74a, and from there further the second green negative electrode 88. And flows to the reflector 44 via the green heat dissipating pad 91.

  However, the heat generated in the red LED 52R is released from the plate-like substrate 51 to the outside because there is no such heat dissipation path. Further, the heat generated by the other first green LED 52Ga, blue LED 52B, and second green LED 52Gb does not all escape to the wiring board 42 side, but a part thereof is released to the outside from the plate-like board 51.

  Here, FIG. 8A is a diagram showing a state in which the light emitting module 40a and the light emitting module 40b are attached to the backlight frame 31 in the light source device 11 according to the present embodiment. FIG. 8A corresponds to a cross section in the vertical direction V of the light source device 11 shown in FIG.

  In the present embodiment, with respect to the backlight frame 31 standing in the vertical direction V, the light emitting part 41 of the light emitting modules 40a to 40e is on the Bottom side, and the second reflecting part 44b of the reflecting plate 44 is on the Top side. The light emitting modules 40a to 40e are attached so as to be positioned respectively. Thereby, for example, the light emitting part 41 of the light emitting module 40b is an upper part of the space S formed between the second reflecting part 44b of the light emitting module 40a arranged on the bottom side of the light emitting module 40b and the backlight frame 31. Located in. In addition, the same positional relationship is configured between the light emitting module 40b and the light emitting module 40c, between the light emitting module 40c and the light emitting module 40d, and between the light emitting module 40d and the light emitting module 40e.

  Therefore, for example, from the red LED 52R, the first green LED 52Ga, the blue LED 52B, and the second green LED 52Gb (not shown) constituting the light emitting module 40a, directly to the outside through the light emitting unit 41 (specifically, the plate substrate 51). The released heat rises along the reflecting surfaces of the first reflecting portion 44a and the second reflecting portion 44b constituting the reflecting plate 44, as indicated by broken line arrows in the drawing.

  On the other hand, FIG. 8B shows a configuration opposite to that of the present embodiment, that is, the light emitting unit 41 of the light emitting modules 40a to 40e is on the Top side with respect to the backlight frame 31 standing in the vertical direction V. In addition, the flow of heat when the light emitting modules 40a to 40e are attached so that the second reflecting portion 44b of the reflecting plate 44 is positioned on the bottom side is shown.

  In the case of adopting such a configuration, for example, the light emitting part 41 of the light emitting module 40a is formed between the second reflecting part 44b of the light emitting module 40b disposed on the top side of the light emitting module 40a and the backlight frame 31. It will be arrange | positioned in the lower part of the space S to be opened, and the space S will open toward the Bottom side. At this time, the heat released from the light emitting unit 41 of the light emitting module 40a is likely to be trapped in the space S formed between the second reflecting unit 44b of the light emitting module 40b adjacent to the Top side and the backlight frame 31. , The temperature rise of the red LED 52R, the first green LED 52Ga, the blue LED 52B, and the second green LED 52Gb is hardly suppressed. As a result, the light emission rate of the LED 52 is reduced.

  Therefore, by adopting the configuration of the present embodiment, the heat discharged from the light emitting unit 41 is less likely to be trapped in the space S, and the temperature rise of the red LED 52R, the first green LED 52Ga, the blue LED 52B, and the second green LED 52Gb is suppressed. It is understood that it is easy to be done.

  In the present embodiment, the configuration is such that white light is generated using the LEDs 52 of three colors of RGB, but the present invention is not limited to this. For example, all the LEDs 52 may be configured by blue light emitting diodes, and white light may be generated by adding a phosphor that converts blue light to yellow light into the lens 54. In addition, a phosphor that converts blue light into green light and red light may be added to the lens 54. Further, for example, a configuration may be adopted in which all the LEDs 52 are composed of ultraviolet light emitting diodes, and a phosphor that converts ultraviolet light into blue light, green light, and red light is added to the lens 54.

  In the present embodiment, the lenses 54 are individually formed on the respective LEDs 52 constituting the light emitting unit 50. However, the present invention is not limited to this, and for example, the LEDs 52 constituting the light emitting unit 50 are collectively arranged. Alternatively, the lens 54 may be formed.

It is a figure which shows the structure of the liquid crystal display device with which this Embodiment is applied. It is a figure for demonstrating the structure of the light source device in a backlight apparatus. It is a perspective view of the light emitting module in a light source device. (A) is a top view of a light emitting module, (b) is IVB-IVB sectional drawing of the light emitting module shown to (a). (A)-(d) is a figure for demonstrating the structure of the light emission unit in a light emitting module. (A), (b) is a figure for demonstrating the structure of the wiring board in a light emitting module. (A), (b) is a figure for demonstrating the structure of the reflecting plate in a light emitting module. (A), (b) is a figure for demonstrating the flow of the heat | fever in a backlight apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Backlight apparatus, 11 ... Light source device, 20 ... Liquid crystal display module, 31 ... Backlight frame, 32 ... Light-emitting device, 40a-40e ... Light-emitting module, 41 ... Light-emitting part, 42 ... Wiring board, 43 ... Connector, 44 Reflector, 44a ... First reflector, 44b ... Second reflector, 45 ... Light-shielding plate, 50 ... Light emitting unit, 51 ... Plate-like substrate, 52R ... Red LED, 52Ga ... First green LED, 52Gb ... Second Green LED, 52B ... Blue LED, 54 ... Lens, 80 ... Power feeding electrode group, V ... Vertical direction, H ... Horizontal direction, S ... Space, W ... Width of electrode

Claims (8)

A display device that displays an image and a backlight device that is provided on the back surface of the display panel and emits light from the back surface of the display panel, and is used in a standing state,
The backlight device includes:
A frame extending in the vertical direction in a state where the display device is erected,
A plurality of light emitting modules provided in the longitudinal direction of the frame,
The light emitting module is:
A light emitting unit that emits light from below to above with the display device standing;
A display device comprising: a reflection member that has an inclined surface that is inclined in a direction approaching the display panel as it goes upward, and that reflects light from the light emitting portion toward the display panel.   The display device according to claim 1, wherein the light emitting unit includes a plurality of solid state light emitting elements arranged in a direction crossing the vertical direction. The light emitting unit includes a plate-like substrate having a plurality of light emitting elements attached to the surface,
The light emitting module is:
The wiring board further includes a wiring board that contacts the side surface of the plate-like substrate to stand the plate-like substrate and arranges the light emitting element upward while being electrically connected to the plate-like substrate. The display device according to claim 1.   The display device according to claim 3, wherein the wiring board is disposed behind the reflecting member when viewed from the display panel. The reflective member is
A first reflecting portion disposed in parallel with the surface of the display panel from the position where the light emitting portion is placed upward;
2. The display device according to claim 1, further comprising: a second reflecting portion that is inclined from the upper end portion of the first reflecting portion toward the upper side toward the display panel.   The display device according to claim 1, wherein the light emitting module further includes a light shielding member that is disposed on the near side of the light emitting unit as viewed from the display panel and blocks light from the light emitting unit toward the display panel. . A light emitting device used in a standing state,
A frame extending in the vertical direction in a state where the light emitting device is erected,
A plurality of light emitting modules provided in the longitudinal direction of the frame,
The light emitting module is:
A light emitting unit that emits light from below to above in a state where the light emitting device is erected, and
A light-emitting device, comprising: a reflecting member that has an inclined surface that inclines in a direction away from the frame as it goes upward, and reflects light from the light-emitting portion toward a side opposite to the frame. The light emitting unit includes a plate-like substrate having a plurality of light emitting elements attached to the surface,
The light-emitting module further includes a wiring board that contacts the side surface of the plate-like substrate to stand up the plate-like substrate, and is arranged to face the light-emitting element upward while being electrically connected to the plate-like substrate. The light emitting device according to claim 7, further comprising:

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