JP2013218842A - Lighting device, display device, and television receiving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent or restrain a light-incident surface of a light guide plate from coming in contact with a light-emitting surface of a light source while enhancing light incident efficiency of light emitted from the light source.SOLUTION: A backlight device 24 includes: a light guide plate 20 having light-incident surfaces 20a on two side faces; an LED substrate 30 of a rectangular shape and arranged so as to make a plate surface at a front side be opposed to the light-incident surface 20a and having a plurality of recessed sections 29 opened on the plate surface at a light-incident surface 20a side and arranged in parallel in its long side direction, wherein respective side faces 29a along a long side direction of the recessed section 29 are sloped surfaces sloped in such directions that the recess width expands toward the plate surface; and a plurality of LEDs 28 wherein the light-emitting surfaces are respectively arranged in the plurality of recessed sections 29 while the light-emitting surfaces are faced to the light-incident surface 20a side.

Description

  The present invention relates to a lighting device, a display device, and a television receiver.

  In recent years, display elements of image display devices such as television receivers are shifting from conventional cathode ray tubes to thin display devices to which thin display elements such as liquid crystal panels and plasma display panels are applied. Is possible. The liquid crystal display device requires a backlight device as a separate illumination device because the liquid crystal panel used for this does not emit light. As an example of such a backlight device, an edge light type backlight device in which a light incident surface is provided on a side surface of a light guide plate and a light source such as an LED is disposed on a side surface side of the light guide plate is known.

  In the edge light type backlight device, in order to increase the light incident efficiency of the light emitted from the light source, it is required to reduce the distance between the light source and the light incident surface of the light guide plate. Further, by reducing the distance between the light source and the light incident surface of the light guide plate, it is possible to reduce the size of the backlight device. For example, Patent Document 1 discloses an edge light type backlight device in which the distance between the light source and the light incident surface of the light guide plate is reduced.

JP 2008-53013 A

  By the way, in the edge light type backlight device, the light guide plate may thermally expand due to heat generated from the light source, and the light incident surface of the light guide plate may extend to the light source side. However, in the backlight device described in Patent Document 1, the light source substrate on which the LED as the light source is mounted is directly attached to the light incident surface of the light guide plate. When the light is extended, the light incident surface of the light guide plate may come into contact with the LED. When the light incident surface of the light guide plate comes into contact with the LED, the LED is damaged and the optical characteristics of the backlight device are deteriorated.

  The technology disclosed in this specification has been created in view of the above problems. It is an object of the present specification to provide a technique capable of preventing or suppressing the light incident surface of the light guide plate from coming into contact with the light output surface of the light source while increasing the light incident efficiency of the light emitted from the light source. And

Means for Solving the Invention

  The technology disclosed in this specification includes a light guide plate having a light incident surface provided on at least one side surface, and a light source substrate having a rectangular shape and having one plate surface opposed to the light incident surface. And each of the side surfaces of the concave portion along the long side direction has a plurality of concave portions that are open on the light incident surface side and are arranged in the long side direction. A light source substrate that has an inclined surface that is inclined in a direction that spreads outward, and a plurality of light sources that are arranged in each of the plurality of recesses in such a manner that its light exit surface is directed toward the light incident surface. It relates to an illuminating device provided with these.

  According to the illumination device as described above, since the light source is arranged in the recess of the light source substrate, the periphery of the light source is surrounded by the light source substrate. The light incident surface of the light guide plate can be prevented or suppressed from contacting the light emitting surface of the light source. Furthermore, since each of the side surfaces along the long side direction of the recess is an inclined surface that is inclined in a direction that spreads outward, the light that has spread to the long side direction out of the light emitted from the light source Since it is difficult to block by the side surface, even when the light source is brought closer to the light guide plate side, it is possible to suppress the occurrence of a dark portion at a portion facing the portion between adjacent light sources on the light incident surface of the light guide plate. . For this reason, compared with the case where the light source is arranged on the plate surface of the light source substrate, the distance between the light source and the light incident surface of the light guide plate can be reduced, and as a result, most of the light emitted from the light source Is incident on the light incident surface, so that the light incident efficiency of the light emitted from the light source can be increased.

The one plate surface of the light source substrate may be located closer to the light incident surface than the light emitting surface of the light source.
According to this configuration, when the light guide plate is thermally expanded, the light incident surface of the light guide plate comes into contact with one plate surface of the light source substrate, so that the light incident surface of the light guide plate comes into contact with the light source. It can be surely prevented.

The distance between the light emitting surface of the light source and the light incident surface of the light guide plate may be 1 mm or less.
According to this structure, compared with the conventional illuminating device, the distance between a light source and the light-incidence surface of a light-guide plate can be narrowed, and the light-incidence efficiency of the light radiate | emitted from the light source can be improved further.

Wiring for supplying electric power to the light source may be arranged along the one plate surface and the recess in the light source substrate.
According to this configuration, it is possible to provide a specific configuration for preventing the light emitted from the light source from being blocked by the wiring.

In the light source substrate, a curvature may be provided at a boundary portion between the one plate surface and a side surface of the concave portion along the long side direction.
When the above wiring is arranged on the light source substrate, if the boundary portion between one plate surface and the side surface along the long side direction of the concave portion is square, the wiring is displaced due to vibration or the like. In such a case, there is a possibility that the wiring is disconnected at the boundary. According to the above configuration, even when the wiring is displaced due to vibration or the like, since the curvature is provided at the boundary portion, the wiring is smooth, so that it is possible to prevent or suppress the wiring from being disconnected.

The light source substrate is disposed such that a short side direction thereof is along a thickness direction of the light guide plate, and a side surface of the concave portion along the short side direction is orthogonal to the light emitting surface of the light source. It may be provided as follows.
When the side surface along the short side direction of the concave portion is inclined toward the outer side of the concave portion, the light emitted from the light source easily leaks in the thickness direction of the light guide plate. According to the above configuration, the light emitted from the light source is less likely to leak in the thickness direction of the light guide plate compared to the case where the side surface along the short side direction of the recess is inclined toward the outside of the recess. be able to. As a result, the loss of light emitted from the light source can be reduced, and the light incident efficiency of the light emitted from the light source can be further increased.

The light source substrate may have heat dissipation properties.
According to this configuration, since heat generated from the light source can be effectively radiated from the light source substrate to the outside, thermal expansion of the light guide plate can be suppressed.

The one plate surface of the light source substrate may have light reflectivity.
According to this configuration, it is possible to reflect the light emitted from the light source toward the side surface of the concave portion or the light toward one plate surface of the light source substrate to the light incident surface side of the light guide plate. The light incident efficiency of the emitted light can be further increased.

The technology disclosed in this specification can also be expressed as a display device including a display panel that performs display using light from the above-described lighting device. In this case, an optical member disposed between the light guide plate and the display panel, a chassis disposed on the opposite side of the display panel from the light guide plate, and a display surface side of the display panel. And a frame that accommodates the display panel, the optical member, and the light guide plate between the chassis and the chassis.
In such a type of display device that does not include a cabinet, the light source and the optical member are not blocked by the member. Therefore, the light emitted from the light source is directed toward the end of the optical member to display the display surface. In some cases, uneven brightness may occur. However, since the light emitted from the light source is difficult to go to the end side of the optical member by arranging the light source in the concave portion, even if the display device does not include a cabinet, the light source It is possible to prevent or suppress the occurrence of luminance unevenness due to the light emitted from the light being directed toward the end of the optical member. Note that a display device in which the display panel is a liquid crystal panel using liquid crystal is also novel and useful. A television receiver provided with the above display device is also new and useful.

  According to the technology disclosed in this specification, it is possible to prevent or suppress the light incident surface of the light guide plate from coming into contact with the light output surface of the light source while improving the light incident efficiency of the light emitted from the light source. .

1 is an exploded perspective view of a television receiver TV according to Embodiment 1. FIG. Disassembled perspective view of the liquid crystal display device 10 Sectional drawing which cut | disconnected the liquid crystal display device 10 along the perpendicular direction The expanded sectional view which expanded the vicinity of the LED unit in FIG. The enlarged plan view which expanded the vicinity of LED unit 32 in the backlight apparatus 24. Sectional drawing which cut | disconnected LED unit 32 along the horizontal direction Perspective view of LED unit 32 Sectional drawing which cut | disconnected the LED unit 132 which concerns on Embodiment 2 along a horizontal direction Sectional drawing which cut | disconnected the LED unit 232 which concerns on Embodiment 3 along a horizontal direction 4 is an exploded perspective view of a liquid crystal display device 310 according to Embodiment 4. FIG. Sectional drawing which cut | disconnected the liquid crystal display device 310 along the perpendicular direction

<Embodiment 1>
Embodiment 1 will be described with reference to the drawings. A part of each drawing shows an X-axis, a Y-axis, and a Z-axis, and each axis direction is drawn in a common direction in each drawing. Among these, the Y-axis direction coincides with the vertical direction, and the X-axis direction coincides with the horizontal direction. In addition, unless otherwise noted, the vertical direction is used as a reference for upper and lower descriptions.

  FIG. 1 is an exploded perspective view of the television receiver TV according to the first embodiment. The television receiver TV includes a liquid crystal display device (an example of a display device) 10, front and back cabinets Ca and Cb that are accommodated so as to sandwich the display device D, a power source P, a tuner T, and a stand S. Yes.

  FIG. 2 is an exploded perspective view of the liquid crystal display device 10. Here, the upper side shown in FIG. 2 is the front side, and the lower side is the back side. As shown in FIG. 2, the liquid crystal display device 10 has a horizontally long rectangular shape as a whole, and includes a liquid crystal panel 16 that is a display panel and a backlight device (an example of a lighting device) 24 that is an external light source. Are integrally held by a bezel 12 or the like having a frame shape.

  Next, the liquid crystal panel 16 will be described. The liquid crystal panel 16 has a configuration in which a pair of transparent (highly translucent) glass substrates are bonded together with a predetermined gap therebetween, and a liquid crystal layer (not shown) is sealed between the glass substrates. Is done. One glass substrate is provided with a switching element (for example, TFT) connected to a source wiring and a gate wiring orthogonal to each other, a pixel electrode connected to the switching element, an alignment film, and the like. The substrate is provided with a color filter and counter electrodes in which colored portions such as R (red), G (green), and B (blue) are arranged in a predetermined arrangement, and an alignment film. Of these, image data and various control signals necessary for displaying an image are supplied to a source wiring, a gate wiring, a counter electrode, and the like from a drive circuit board (not shown). A polarizing plate (not shown) is disposed outside both glass substrates.

  Next, the backlight device 24 will be described. FIG. 3 shows a cross-sectional view of a cross section of the liquid crystal display device 10 cut along the vertical direction (Y-axis direction). As shown in FIGS. 2 and 3, the backlight device 24 includes a frame 14, an optical member 18, and a chassis 22. The frame 14 has a frame shape, is disposed along the edge side of the surface of the light guide plate 20 (light output surface 20b), and supports the liquid crystal panel 16 along the inner edge. The optical member 18 is placed on the front side of the light guide plate 20 (the light exit surface 20b side). The chassis 22 has a substantially box shape opened to the front side (light emission side, liquid crystal panel 16 side).

  A pair of LED (Light Emitting Diode) units 32, 32, a reflection sheet 26, and a light guide plate 20 are accommodated in the chassis 22. The pair of LED units 32, 32 extend in the long side direction of the chassis 22 and are arranged on both long side outer edges (side plates) 22 b, 22 c of the chassis 22, toward the light incident surface 20 a side of the light guide plate 20. Emits light. Both side surfaces (light incident surfaces) 20a in the long side direction of the light guide plate 20 are arranged at positions facing the LED unit 32, and guide light emitted from the LED unit 32 to the liquid crystal panel 16 side. The optical member 18 is placed on the front side of the light guide plate 20. In the backlight device 24 according to the present embodiment, the light guide plate 20 and the optical member 18 are disposed directly below the liquid crystal panel 16 and the LED unit 32 that is a light source is disposed on the side end of the light guide plate 20. A so-called edge light system (side light system) is adopted.

  The chassis 22 is made of a metal such as an aluminum material, for example, and has a bottom plate 22a having a rectangular shape in a plan view, side plates 22b and 22c rising from outer edges of both long sides of the bottom plate 22a, and both short sides of the bottom plate 22a. It consists of a side plate that rises from the outer edge. A space facing the LED units 32, 32 in the chassis 22 is a housing space for the light guide plate 20. A power circuit board (not shown) for supplying power to the LED unit 32 is attached to the back side of the bottom plate 22a.

  The optical member 18 is formed by laminating a diffusion sheet 18a, a lens sheet 18b, and a reflective polarizing plate 18c in order from the light guide plate 20 side. The diffusion sheet 18a, the lens sheet 18b, and the reflective polarizing plate 18c have a function of converting light emitted from the LED unit 32 and passing through the light guide plate 20 into planar light. The liquid crystal panel 16 is installed on the upper surface side of the reflective polarizing plate 18d, and the optical member 18 includes the light guide plate 20 and the liquid crystal panel in a state where the edge on the front surface side of the reflective polarizing plate 18c is held by the frame 14. 16 is arranged between.

  The light guide plate 20 is a rectangular plate-like member, is formed of a highly transparent (highly transparent) resin such as acrylic, is in contact with the reflective sheet 26 and is supported by the chassis 22. Yes. As shown in FIG. 2, the light guide plate 20 has a light emitting surface 20b, which is a main plate surface, facing a lens sheet 18a, which will be described later, between the pair of LED units 32 and 32, and a plate surface opposite to the light emitting surface 20b. Are arranged in such a manner that the opposite plate surface 20c is directed to the reflection sheet 26 side. By arranging such a light guide plate 20, the light generated from the LED unit 32 enters the light entrance surface 20 a of the light guide plate 20 and exits from the light exit surface 20 b facing the lens sheet 18 a, The liquid crystal panel 16 is irradiated from the back side.

  Next, the configuration of the LED unit 32, which is a main part of the present embodiment, will be described in detail. The LED unit 32 includes an LED substrate (an example of a light source substrate) 30 and an LED (an example of a light source) 28. As shown in FIGS. 2 and 3, the LED substrate 30 constituting the LED unit 32 has an elongated plate shape extending along the long side direction (X-axis direction) of the light guide plate 20, and its main plate surface Are accommodated in the frame 14 and the chassis 22 in a posture parallel to the X-axis direction and the Z-axis direction, that is, a posture parallel to the light incident surface 20 a of the light guide plate 20. Therefore, the short side direction of the LED substrate 30 coincides with the thickness direction (Z-axis direction) of the light guide plate 20. The main plate surface of the LED substrate 30 is the inner side, that is, the surface facing the light guide plate 20 side (the surface facing the light incident surface 20a of the light guide plate 20, hereinafter referred to as the facing surface 30a). A plurality of recesses 29 are provided in a line along the side direction (X-axis direction). Each recess 29 is opened to the light guide plate 20 side, and the opening is rectangular. Accordingly, each recess 29 includes a pair of side surfaces 29a and 29a along the long side direction (X-axis direction) of the LED substrate 30 and a pair of side surfaces 29b and 29b along the short side direction (Y-axis direction) of the LED substrate 30. And a bottom surface.

  In each recess 29 of the LED substrate 30, the LEDs 28 constituting the LED unit 32 are arranged. The LED 28 has a block shape, and as shown in FIG. 6, the LED chip 31 disposed in the center thereof is sealed with a resin material. Further, the LEDs 28 are arranged such that the light emission surface 28a faces the light guide plate 20 side, and the optical axis thereof substantially coincides with the Y-axis direction. A distance W1 (see FIG. 4) between the light emitting surface 28a of the LED 28 and the light incident surface 20a of the light guide plate 20 is 1 mm or less. The LED chip 31 has a single main emission wavelength, and specifically, one that emits blue light in a single color is used. On the other hand, the resin material that seals the LED chip 31 is dispersed and blended with a phosphor that emits a predetermined color when excited by the blue light emitted from the LED chip 31. It is supposed to be emitted. In addition, as the phosphor, for example, a yellow phosphor that emits yellow light, a green phosphor that emits green light, and a red phosphor that emits red light are used in appropriate combination, or any one of them is used. It can be used alone.

  In each recess 29 provided in the LED substrate 30, a pair of side surfaces 29a, 29a along the long side direction (X-axis direction) of the LED substrate 30 are inclined surfaces that incline in a direction that spreads outward. (See FIGS. 6 and 7). That is, of the side surfaces 29a and 29b of the recess 29, the side surface 29a located between the adjacent LEDs 28 is an inclined surface. On the other hand, a pair of side surfaces 29b, 29b along the short side direction (Z-axis direction) of the LED substrate 30 in each recess 29 is provided so as to be orthogonal to the light emitting surface 28a of the LED 28 (see FIG. 7). By providing the side surfaces 29a and 29b of the recess 29 in this way, the light that has spread in the long side direction (X-axis direction) of the LED substrate 30 out of the light emitted from the LED 28 is an inclined surface. It becomes difficult to be blocked by the side surface 29a of the recess 29, and enters the light incident surface 20a of the light guide plate 20 while spreading in the long side direction (X-axis direction). On the other hand, of the light emitted from the LED 28, the light that spreads in the short side direction (Z-axis direction) of the LED substrate 30 is easily blocked by the side surface 29b of the concave portion 29 orthogonal to the light emitting surface 28a. It is difficult to spread in the side direction (Z-axis direction), that is, it is difficult to face the bottom plate 22a side of the chassis 22 or the optical member 18 side.

  The base material of the LED substrate 30 is made of a metal such as aluminum having heat dissipation, and the facing surface 30a has light reflectivity. And the wiring 34 which consists of a metal film for supplying electric power to each LED28 via the insulating layer (not shown) is distribute | arranged to the opposing surface 30a of the LED board 30 (refer FIG. 6). The wiring 34 is arranged along the opposing surface 30 a of the LED substrate 30, the side surface 29 a that is the inclined surface of the concave portion 29, and the bottom surface of the concave portion 29. For this reason, the light emitted from the LED 28 is not blocked by the wiring 34. Further, by providing the wiring 34 in this way, it is possible to prevent the wiring from interfering when the LED 28 is disposed in the recess 29 in the manufacturing process of the LED unit 32.

  As shown in FIG. 6, a height difference W <b> 2 is provided between the light emitting surface 28 a of the LED 28 and the facing surface 30 a of the LED substrate 30, which are different in the Y-axis direction. The light exit surface 28 a of the LED 28 is set to a height lower than the facing surface 30 a of the LED substrate 30. Therefore, the facing surface 30 a of the LED substrate 30 is positioned closer to the light guide plate 20 than the light emitting surface 28 a of the LED 28. For this reason, even when the light incident surface 20a of the light guide plate 20 extends toward the LED 28 due to thermal expansion or the like, the facing surface 30a of the LED substrate 30 comes into contact with the light incident surface 20a of the light guide plate 20, and the light of the LED 28 The exit surface 28 a is prevented from coming into contact with the light incident surface 20 a of the light guide plate 20.

  Now, as described above, each LED 28 is arranged in the recess 29 provided in the LED substrate 30, so that the LED 28 is not arranged on the facing surface 30 a of the LED substrate 30. And the light incident surface 20a of the light guide plate 20 can be reduced, thereby making it possible to narrow the frame of the backlight device 24. Further, as described above, the light emitted from the LED 28 enters the light incident surface 20a of the light guide plate 20 while spreading in the long side direction (X-axis direction). Even when the distance to the light incident surface 20a is reduced, light can be incident over a wide range of the light incident surface 20a of the light guide plate 20, and adjacent to the light incident surface 20a of the light guide plate 20. It can prevent or suppress that a dark part generate | occur | produces in the site | part which opposes between LED28 to do. In addition, as described above, since the light emitted from the LED 28 is difficult to go to the bottom plate 22a side or the optical member 18 side of the chassis 22, the loss of light emitted from the LED 28 can be reduced. Light incident efficiency can be increased.

  As described above, in the backlight device 24 according to the present embodiment, since the LED 28 is arranged in the recess 29 of the LED substrate 30, the LED 28 is surrounded by the LED substrate 30. Even in the case of thermal expansion or the like, it is possible to prevent or suppress the light incident surface 20a of the light guide plate 20 from coming into contact with the light emitting surface 28a of the LED 28. Furthermore, since each of the side surfaces 29a along the long side direction (X-axis direction) of the recess 29 is an inclined surface that is inclined in a direction spreading outward, the long side direction of the light emitted from the LED 28 Since the light that spreads in the (X-axis direction) side is difficult to be blocked by the side surface 29a, even when the LED 28 is brought close to the light guide plate 20 side, between the adjacent LEDs 28 on the light incident surface 20a of the light guide plate 20 It can suppress that a dark part arises in the site | part facing a site | part. For this reason, compared with the case where LED28 is distribute | arranged on the plate | board surface of LED board 30, the distance between LED28 and the light-incidence surface 20a of the light-guide plate 20 can be narrowed, As a result, the light radiate | emitted from LED28 Since most of the light enters the light incident surface 20a, the light incident efficiency of the light emitted from the LED 28 can be increased.

  Further, in the backlight device 24 according to the present embodiment, the facing surface 30a of the LED substrate 30 is positioned closer to the light incident surface 20a than the light emitting surface 28a of the LED 28. Thereby, when the light guide plate 20 is thermally expanded, the light incident surface 20a of the light guide plate 20 comes into contact with the opposing surface 30a of the LED 30 substrate, and therefore the light incident surface 20a of the light guide plate 20 comes into contact with the LED 28. This can be surely prevented.

  In the backlight device 24 according to the present embodiment, the distance W1 between the light emitting surface 28a of the LED 28 and the light incident surface 20a of the light guide plate 20 is 1 mm or less. For this reason, the distance between the LED 28 and the light incident surface 20a of the light guide plate 20 can be reduced as compared with the conventional backlight device in which the distance between the two is 1 mm, and the incident light emitted from the LED 28 can be reduced. The light efficiency can be further increased.

  Further, in the backlight device 24 according to the present embodiment, the wiring 34 that supplies power to the LEDs 28 is arranged along the facing surface 30 a and the recess 29 in the LED substrate 30. For this reason, the light emitted from the LED 28 is not blocked by the wiring 34.

  In the backlight device 24 according to the present embodiment, the LED substrate 30 is arranged so that the short side direction (Z-axis direction) is along the thickness direction of the light guide plate 20. A side surface 29 b along the side direction (Y-axis direction) is provided so as to be orthogonal to the light emitting surface 28 a of the LED 28. Here, when the side surface 29b along the short side direction (Z-axis direction) of the recess 29 is inclined toward the outside of the recess 29, the light emitted from the LED 28 is in the thickness direction (Z-axis) of the light guide plate 20. Direction). According to the configuration according to the present embodiment, the light emitted from the LED 28 is compared with the case where the side surface 29b along the short side direction (Z-axis direction) of the recess 29 is inclined toward the outside of the recess 29. It can be made difficult to leak in the thickness direction (Z-axis direction) of the light guide plate 20. As a result, loss of light emitted from the LED 28 can be reduced, and the light incident efficiency of light emitted from the LED 28 can be further increased.

  Further, in the backlight device 24 according to the present embodiment, the LED substrate 30 has heat dissipation. Thereby, the heat generated from the LED 28 can be effectively radiated from the LED substrate 30 to the outside, and the thermal expansion of the light guide plate 20 can be suppressed.

  Further, in the backlight device 24 according to the present embodiment, the facing surface 30a of the LED substrate 30 has light reflectivity. As a result, of the light emitted from the LED 28, the light directed toward the side surfaces 29 a and 29 b of the recess 29 and the light directed toward the facing surface 30 a of the LED substrate 30 can be reflected to the light incident surface 20 a side of the light guide plate 20. Therefore, the light incident efficiency of the light emitted from the LED 28 can be further increased.

<Embodiment 2>
A second embodiment will be described with reference to the drawings. In the second embodiment, the shape of the boundary portion 130s between the side surface of the recess 129 and the facing surface 130a of the LED substrate 130 is different from that of the first embodiment. Since the other configuration is the same as that of the first embodiment, the description of the structure, operation, and effect is omitted. In FIG. 8, the part obtained by adding the numeral 100 to the reference numeral in FIG. 4 is the same as the part described in the first embodiment.

  In the backlight device according to the second embodiment, as illustrated in FIG. 8, a side surface 129 a (a side surface along the long side direction (X-axis direction) of the LED substrate 130) and the wiring 134 are disposed. Curvature is provided at a boundary portion 130s between the opposite side surface) and the facing surface 130a of the LED substrate 130. Further, a curvature is also provided in a boundary portion 129s between a side surface 129a that is an inclined surface of the concave portion 129 and a bottom surface of the concave portion 129. Here, when the wiring 134 is arranged along the opposing surface 130a and the concave portion 129 of the LED substrate 130 as in this embodiment, the side surfaces that are the inclined surfaces of the opposing surface 130a and the concave portion 129 as in the first embodiment. If the boundary portion 139a between the 129a and the 129a has a square shape, the wiring 134 may be disconnected at the boundary portion 130s when the wiring 134 is displaced due to vibration or the like. Also, the wiring 134 may be disconnected for the same reason at the boundary portion 129s between the side surface 129a that is the inclined surface of the recess 129 and the bottom surface of the recess 129. According to the above configuration, even when the wiring 134 is displaced due to vibration or the like, the boundary portions 130 s and 129 s are provided with curvature so that the wiring 134 is prevented from being disconnected. Can be suppressed.

<Embodiment 3>
Embodiment 3 will be described with reference to the drawings. In the third embodiment, the height of the light emission surface 228a of the LED 228 is different from that of the first embodiment. Since the other configuration is the same as that of the first embodiment, the description of the structure, operation, and effect is omitted. In FIG. 9, the parts obtained by adding the numeral 200 to the reference numerals in FIG. 6 are the same as the parts described in the first embodiment.

  In the backlight device according to the third embodiment, as shown in FIG. 9, the height of the light emission surface 228 a of the LED 228 and the height of the facing surface 230 a of the LED substrate 230 are equal. Even in such a case, when the light incident surface 220a of the light guide plate 220 extends toward the LED unit 232 due to thermal expansion or the like, the light incident surface 220a of the light guide plate 220 and the opposing surface 230a of the LED substrate 230 are in contact with each other. Therefore, the LED 228 can be prevented or suppressed from being damaged by the light emitting surface 228a of the LED 228 coming into contact with the light incident surface 220a of the light guide plate 220.

<Embodiment 4>
Embodiment 4 will be described with reference to the drawings. The fourth embodiment is different from the first embodiment in that the liquid crystal display device 310 does not include a cabinet. Since other configurations are the same as those of the liquid crystal display device 10 including the cabinet according to the first embodiment, the description thereof is omitted.

  As shown in FIGS. 10 and 11, the liquid crystal display device 310 according to the fourth embodiment includes main components between a frame 312 that forms the front side appearance and a chassis 322 that forms the back side appearance. It is assumed that it is housed in the possessed space. Major components housed in the frame 312 and the chassis 322 include at least a liquid crystal panel 316, an optical member 318, a light guide plate 320, and an LED unit 332. Among these, the liquid crystal panel 316, the optical member 318, and the light guide plate 320 are held in a state of being sandwiched between the front side frame 312 and the back side chassis 322 while being stacked on each other. The LED unit 332 includes an LED light source 328, an LED substrate 330 on which the LED light source 328 is mounted, and a heat radiating member 336 having an L-shaped cross-sectional view to which the LED substrate 330 is attached.

  The frame 312 includes a panel pressing portion 312a that is parallel to the display surface 316c of the liquid crystal panel 316 and presses the liquid crystal panel 316 from the front side, and a side wall portion 312b that protrudes from the outer peripheral side portion of the panel pressing portion 312a toward the back side. The cross-sectional shape is substantially L-shaped. A screw attachment portion 313 to which the screw member SM is attached is integrally formed at a position closer to the inner side than the side wall portion 312b (near the light guide plate 320) in the panel pressing portion 312a. The chassis 322 has a horizontally elongated bottom plate portion 322a similar to the light guide plate 316, and a pair of LEDs that protrude from the both long side end portions of the bottom plate portion 322a to the back side and accommodate the LED unit 332. And an accommodating portion 322b. The frame 312 and the chassis 322 are assembled by the screw member SM described above.

  In the liquid crystal display device 310 of the type that does not include a cabinet as in the present embodiment, as shown in FIG. 11, the light is emitted from the LED 318 because the LED 328 and the optical member 318 are not blocked by the member. However, the luminance unevenness may occur on the display surface 316c of the liquid crystal panel 316 by moving toward the end of the optical member 318. However, since the LED 328 is disposed in the recess 329 provided in the LED substrate 330, the light emitted from the LED 328 is difficult to go to the end side of the optical member 318. In a liquid crystal display device 310 of a type that does not include a cabinet, it is possible to prevent or suppress the occurrence of luminance unevenness caused by the light emitted from the LED 328 going to the end side of the optical member 318.

The modifications of the above embodiments are listed below.
(1) In each of the above embodiments, the configuration in which the LED substrate is made of metal is exemplified, but the material of the LED substrate is not limited.

(2) In each of the above embodiments, the configuration in which the LED units are disposed on both side surfaces in the long side direction of the light guide plate is illustrated, but the LED unit is disposed only on one side surface of the light guide plate. There may be. Or the structure by which the LED unit was distribute | arranged to all the side surfaces of a light-guide plate may be sufficient.

(3) In each of the above-described embodiments, the configuration in which the wiring for supplying power to the LED is arranged in the recess is illustrated. However, for example, the wiring is arranged only on the opposite surface of the LED substrate so as to avoid the recess. It may be a configured.

(4) In each of the above embodiments, a liquid crystal display device using a liquid crystal panel as an example of the display panel has been exemplified. However, the present invention can also be applied to display devices using other types of display panels.

(5) In each of the above embodiments, the television receiver provided with the tuner has been exemplified. However, the present invention can also be applied to a display device that does not include the tuner.

  As mentioned above, although each embodiment of this invention was described in detail, these are only illustrations and do not limit a claim. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.

  In addition, the technical elements described in the present specification or drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in this specification or the drawings can achieve a plurality of objects at the same time, and has technical usefulness by achieving one of the objects.

  TV ... TV receiver, Ca, Cb ... cabinet, T ... tuner, S ... stand, 10, 310 ... liquid crystal display, 12 ... bezel, 14, 314 ... frame, 16, 316 ... liquid crystal panel, 18, 318 ... optical Member, 20, 320 ... light guide plate, 22, 322 ... chassis, 24, 324 ... backlight device, 26, 326 ... reflection sheet, 28, 128, 228, 328 ... LED, 29, 129, 229, 329 ... recess, 29a, 129a, 229a ... side surfaces (along the long side direction of the LED substrate), 29b, 129b, 229b ... side surfaces (along the short side direction of the LED substrate), 30, 130, 230, 330 ... LED substrate, 32 , 132, 232, 332 ... LED unit

Claims (12)

A light guide plate provided with a light incident surface on at least one side surface;
A light source substrate having a rectangular shape and disposed so that one plate surface faces the light incident surface, and opens on the light incident surface side on the one plate surface and is aligned in the long side direction. A light source substrate having a plurality of recesses provided, each of the side surfaces along the long side direction of the recesses being inclined surfaces that are inclined in a direction of spreading outward,
A plurality of light sources arranged in such a manner that each of the plurality of recesses has its light exit surface directed toward the light incident surface;
A lighting device comprising:   The lighting device according to claim 1, wherein the one plate surface of the light source substrate is located closer to the light incident surface than the light emitting surface of the light source.   The lighting device according to claim 1 or 2, wherein a distance between the light emitting surface of the light source and the light incident surface of the light guide plate is 1 mm or less.   The lighting device according to any one of claims 1 to 3, wherein wiring for supplying electric power to the light source is arranged along the one plate surface and the concave portion of the light source substrate.   The lighting device according to claim 4, wherein a curvature is provided at a boundary portion between the one plate surface and a side surface of the concave portion along the long side direction in the light source substrate. The light source substrate is arranged such that the short side direction is along the thickness direction of the light guide plate,
6. The illumination according to claim 1, wherein in the light source substrate, a side surface along the short side direction of the concave portion is provided so as to be orthogonal to the light emitting surface of the light source. apparatus.   The lighting device according to any one of claims 1 to 6, wherein the light source substrate has heat dissipation properties.   The lighting device according to any one of claims 1 to 7, wherein the one plate surface of the light source substrate has light reflectivity.   A display apparatus provided with the display panel which displays using the light from the illuminating device of any one of Claims 1-8. An optical member disposed between the light guide plate and the display panel;
A chassis disposed on the side opposite to the display panel with respect to the light guide plate;
The display according to claim 9, further comprising: a frame that is disposed on the display surface side of the display panel and that accommodates the display panel, the optical member, and the light guide plate sandwiched between the display panel and the chassis. apparatus.   The display device according to claim 9 or 10, wherein the display panel is a liquid crystal panel using liquid crystal.   A television receiver comprising the display device according to any one of claims 9 to 11.

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