JP2013196931A - Lighting device, display device, and television receiving apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent or suppress an optical member arranged on a light-emitting surface of a light guide plate from bending by heat from a light source.SOLUTION: A backlight device 24 includes a light guide plate 20 which has a chassis 22, a light incident surface 20a, a light emitting surface 20b, an opposite plate surface 20c on the opposite side to the light emitting surface 20b and in which the opposite plate surface 20c is arranged separated from a bottom plate 22a, an LED 28, an optical member 18 arranged separated from the light emitting surface 20b, an LED substrate 30, a heat radiation member 36 which has a bottom part 36a that is separated from the opposite plate surface 20c on the opposite plate surface 20c side and extends in a plate shape to be exposed to the outside, and of which tip is installed on the end part of the bottom plate 22a, and a rising part 36b rising from the bottom part 36a, and has a heat radiation performance, and a first support member 38 which has a heat radiation performance and supports the light guide plate 20 as at least a part is arranged between the bottom part 36a and the end part on the light incident surface 20a side of the opposite plate surface 20c.

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 effectively dissipate the heat generated from the light source to the outside, the light source board on which the light source is mounted is abutted and a heat radiating member attached on the housing is arranged. There is. An edge light type backlight device including such a heat radiating member is disclosed in Patent Document 1, for example.

JP 2010-177076 A

  By the way, in an edge light type backlight device, an optical member for diffusing light traveling toward the display surface is usually disposed on the light emitting surface side of the light guide plate. However, if the heat dissipation by the heat radiating member is insufficient, the heat generated from the light source is directed to the light exit surface side of the light guide plate, and the end of the optical member may be bent by heat. Defects such as luminance unevenness may occur on the display surface.

  The technology disclosed in this specification has been created in view of the above problems. In this specification, it aims at providing the technique which can prevent thru | or suppress the optical member distribute | arranged on the light-projection surface of a light-guide plate with the heat | fever from a light source.

  The technology disclosed in the present specification includes a chassis having at least a bottom plate, a light incident surface provided on at least one side surface, a light emitting surface provided on one plate surface, and the light emitting surface opposite to the light emitting surface. A light guide plate, a part of which is opposite to the bottom plate, and the opposite plate surface is spaced apart from the bottom plate, and the light incidence A light source disposed facing the surface, an optical member disposed on the light emitting surface side away from the light emitting surface, a light source substrate having the light source disposed on one surface, and the opposite plate surface On the side, the one plate surface is spaced from the opposite plate surface and the other plate surface is exposed to the outside so as to extend from the side facing the light source in a plate shape toward the center side of the light guide plate, The bottom of which the extending tip is attached to the end of the bottom plate, and the bottom of the bottom It rises in a plate shape from the side facing the source toward the optical member side, and one plate surface is in contact with the plate surface on the opposite side of the light source substrate from which the light source is disposed. A heat-dissipating member having a heat dissipation property, and having a heat dissipation property, and at least a part thereof is disposed between the bottom surface portion and the end of the opposite plate surface on the light incident surface side. And a first support member that supports the light guide plate.

  According to the illumination device as described above, the light guide plate is disposed away from the bottom surface portion of the heat dissipation member and the bottom plate of the chassis, thereby suppressing heat from being transmitted from the bottom surface portion or the bottom plate to the light guide plate. Thus, heat can be easily radiated from the bottom surface or the bottom plate to the outside. Furthermore, since the distance between the light source and the first support member is close because the first support member having heat dissipation is arranged at the light incident surface side end of the light guide plate, the light source emits light. The generated heat is transferred to the first support member by thermal radiation, and further transferred to the bottom surface of the heat dissipation member via the first support member, so that heat is easily radiated from the bottom surface exposed to the outside. Can do. On the other hand, since the optical member arranged on the light emitting surface side of the light guide plate is separated from the light emitting surface, the heat from the light source can hardly be transmitted to the optical member. As a result, most of the heat from the light source is transferred to the heat radiating member via the first support member, so that the optical member can be prevented or suppressed from being bent by the heat from the light source. .

A buffer member having buffering properties may be disposed between the first support member and the opposite plate surface.
According to this structure, the vibration in the thickness direction of the light guide plate can be absorbed by the buffer member.

The light guide plate is supported by being disposed between the bottom surface portion and the opposite plate surface in the vicinity of the attachment portion of the bottom surface portion with the bottom plate, and is separated from the first support member and has a buffering property. You may further provide the 2nd support member which has these.
According to this configuration, heat from the chassis can be hardly transmitted to the light guide plate side while effectively supporting the light guide plate, and vibrations in the thickness direction of the light guide plate can be further absorbed by the second support member. Can do.

The first support member may have a protruding portion that protrudes to the light source side of the light incident surface at a part thereof.
According to this configuration, since the distance between the light source and the first support member becomes closer, the heat generated by the light emission of the light source may be more easily transferred to the first support member by thermal radiation. it can.

The protruding portion may be provided with a protruding portion that protrudes closer to the optical member than the opposite plate surface and contacts the light incident surface.
According to this configuration, since the distance between the light source and the light guide plate is regulated by the protruding portion, the distance between the light source and the light guide plate can be maintained constant, and the optical design of the illumination device is good. It can be.

In the first support member, a width along the thickness direction of the light source substrate may be within a range of 5 mm to 30 mm.
If the width of the first support member along the thickness direction of the light source substrate is too small, the light guide plate cannot be effectively supported, and if the width is too large, the influence of heat received from the bottom surface of the heat radiating member. Is a big one. According to said structure, the optimal magnitude | size for reducing the influence of the heat received from a bottom face part can be provided, supporting a light-guide plate.

The first support member may be made of metal.
According to this configuration, it is possible to provide a specific material for the first support member for effectively transferring heat from the light source to the second bottom surface portion via the first support member.

The first support member may be integrally formed with the heat dissipation member.
According to this configuration, since the first support member is not required separately, the manufacturing process of the lighting device can be simplified.

The plate surface of the light source substrate on the side where the light source is disposed and the first support member may each have light reflectivity.
According to this configuration, the light emitted from the light source and directed toward the first support member is reflected by the first support member toward the light source substrate, and the light reaching the light source substrate is further reflected to the light incident surface side. Therefore, the light incident efficiency of the light emitted from the light source can be 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. A display device in which the display panel is a liquid crystal panel using liquid crystal is also new and useful. A television receiver provided with the above display device is also new and useful.

  According to the technology disclosed in the present specification, it is possible to prevent or suppress the optical member disposed on the light emitting surface of the light guide plate from being bent by the heat 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 view of the liquid crystal display device 10 Cross-sectional view of the main part of the liquid crystal display device 10 Sectional drawing of the principal part of the liquid crystal display device 110 which concerns on Embodiment 2. FIG. Sectional drawing of the principal part of the liquid crystal display device 210 which concerns on Embodiment 3. FIG. Sectional drawing of the principal part of the liquid crystal display device 310 which concerns on Embodiment 4. FIG.

<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 the optical member 18, the frame 14, the chassis 22, and a pair of heat dissipation members 36 and 36. The frame 14 has a frame shape, is disposed along the edge side of the surface of the light guide plate 20 (light emitting surface 20b), and supports the liquid crystal panel 16 along the inner edge. The optical member 18 is disposed on the front side (light emission surface 20 b side) of the light guide plate 20 and is placed on the frame 14. The chassis 22 includes a bottom plate 22a extending along the long side direction (X-axis direction) of the light guide plate 20, and side walls 22b rising from both ends of the bottom plate 22a to the front side (light emission side, liquid crystal panel 16 side). Has been. The pair of heat dissipating members 36, 36 extend along both short side directions (X-axis direction) of the light guide plate 20, respectively. A box-shaped accommodation space S is formed between the bottom plate 22 a of the chassis 22, the side plate 22 b of the chassis 22, and the pair of heat radiation members 36 and 36.

  In the accommodation space S formed by the chassis 22 and the pair of heat radiation members 36, 36, a pair of LED (Light Emitting Diode) units 32, 32, a reflection sheet 26, and the light guide plate 20 are accommodated. . The pair of heat radiating members 36, 36 respectively extend in the long side direction (X-axis direction) of the chassis 22 and have a substantially L-shaped cross section, and a part thereof forms an outer wall on the long side of the accommodation space S. Yes. The pair of LED units 32, 32 extend along the long side direction (X-axis direction) of the chassis 22, and are arranged in contact with the long side of the light guide plate 20 and inside the heat radiating member 36. The light is emitted toward the light incident surface 20 a side of the light guide plate 20. The long side direction (X-axis direction) side surface (light incident surface) 20a of the light guide plate 20 is disposed at a position facing each LED unit 32, 32, and the light emitted from the LED unit 32 is directed to the liquid crystal panel 16 side. Lead to. The optical member 18 is arranged on the front side (light emitting surface side) of the light guide plate 20 so as to be separated from the light guide plate 20.

  The chassis 22 is made of a metal such as an aluminum-based material, for example, and has a bottom plate 22a having a rectangular shape in plan view extending along the long side direction (X-axis direction) of the light guide plate 20 and outer edges of both short sides of the bottom plate 22a. It is comprised from the side plate 22b which stands | starts up. The ends of both long sides of the bottom plate 22a are attached to the ends of the bottom surface 36a of the heat radiating member 36 described later. Thereby, the chassis 22 and the heat radiating member 36 are fixed to each other. A space facing the LED units 32 and 32 in the housing space S formed by the chassis 22 and the heat dissipation member 36 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. A liquid crystal panel 16 is installed on the upper surface side of the reflective polarizing plate 18 d, and the optical member 18 is disposed between the frame 14 and the liquid crystal panel 16. That is, the optical member 18 is slightly larger than the inner edge of the frame 14 and is placed on the inner edge. Therefore, as shown in the sectional view of FIG. 3, the space formed between the LED 28 and the light guide plate 20 and the end of the optical member 18 are separated by the frame 14.

  The LED unit 32 has a configuration in which LED light sources 28 that emit white light are arranged in a line on an LED substrate 30 that is made of a resin rectangle. The LED substrate 30 is arranged with the surface on which the LEDs 28 are disposed (hereinafter referred to as a mounting surface 30a) having light reflectivity, and the surface opposite to the mounting surface 30a is in contact with the heat radiating member 36. Has been. The LED 28 may emit white light by applying a phosphor having a light emission peak in a yellow region to a blue light emitting element. Alternatively, the blue light emitting element may emit white light by applying a phosphor having emission peaks in the green and red regions. Further, a phosphor having a light emission peak in a green region may be applied to a blue light emitting element, and white light may be emitted by combining a red light emitting element. The LED 28 may emit white light by combining a blue light emitting element, a green light emitting element, and a red light emitting element. Further, a combination of an ultraviolet light emitting element and a phosphor may be used. In particular, an ultraviolet light-emitting element may emit white light by applying a phosphor having emission peaks in blue, green, and red, respectively.

  The light guide plate 20 is a rectangular plate-shaped member, is formed of a resin having high translucency (high transparency) such as acrylic, is in contact with the reflection sheet 26, and has a bottom plate 22a of the chassis 22 and It is supported on the bottom plate 22a of the chassis 22 by a first support member 38 and a second support member 40, which will be described later, in a state of being separated from a bottom surface portion 36a of the heat dissipation member 36 which will be described later. As shown in FIGS. 2 and 3, the light guide plate 20 has a light emitting surface 20b as a main plate surface facing the diffusion sheet 18a between the pair of LED units 32 and 32, and is opposite to the light emitting surface 20b. The opposite plate surface 20c, which is the plate surface, is arranged in such a manner as to face the reflection sheet 26 side. By arranging such a light guide plate 20, the light generated from the LED unit 32 is incident from the light incident surface 20 a of the light guide plate 20 and is emitted from the light emitting surface 20 b facing the diffusion sheet 18 a. The liquid crystal panel 16 is irradiated from the back side. 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. The so-called edge light method (side light method) is adopted.

  The reflection sheet 26 has a rectangular shape, is made of synthetic resin, and has a white surface with excellent light reflectivity. The reflection sheet 26 abuts against the opposite plate surface 20 c of the light guide plate 20 and is a bottom plate 22 a of the chassis 22. And it arrange | positions in the state spaced apart from the bottom face part 36a of the thermal radiation member 36 mentioned later. The reflection sheet 26 has a reflection surface on the front side, and this reflection surface is in contact with the opposite plate surface 20 c of the light guide plate 20. And the reflection sheet 26 can reflect the light which leaked from the LED unit 32 or the light-guide plate 20 to the reflective surface side.

  Then, the structure of the thermal radiation member 36, the 1st support member 38, and the 2nd support member 40 which are the principal parts of this embodiment is demonstrated. The pair of heat dissipating members 36, 36 are L-shaped in sectional view and are plate-like members having higher heat dissipation than the LED substrate 30. Each heat radiating member 36 is arranged on the outer side of the light guide plate 20 along the long side direction (X-axis direction) of the light guide plate 20, and includes a bottom surface portion 36a and a rising portion 36b (FIG. 4). reference). The bottom surface portion 36a constituting the heat radiating member 36 has a rectangular shape in plan view (see FIG. 2), extends in a plate shape from the LED substrate 30 side toward the center side of the light guide plate 20, and the plate surface is guided. It extends so as to be parallel to the opposite plate surface 20 c of the optical plate 20. The bottom surface portion 36 a extends away from the opposite plate surface 20 c of the light guide plate 20, and an end portion extending toward the center side of the light guide plate 20 serves as an attachment site 36 a 1 to be attached to the bottom plate 22 a of the chassis 22. . The attachment portion 36a1 is attached and fixed to the bottom plate 22a of the chassis 22 by screwing or the like. Further, the bottom surface portion 36a is in a state in which a plate surface (back plate surface) opposite to the plate surface (front plate surface) facing the opposite plate surface 20c is exposed to the outside of the backlight device 24. Yes.

  The rising portion 36b constituting the heat radiating member 36 is located on the side opposite to the light incident surface 20a of the light guide plate 20 across the LED 28 from the end on the side opposite to the side where the mounting portion 36a1 is provided in the bottom surface portion 36a. It rises toward the optical member 18 side (front side) in a shape orthogonal to the bottom surface portion 36a. That is, the rising portion 36b is arranged in parallel with the LED substrate 30, and the mounting surface 30a of the LED substrate 30 is disposed on one plate surface (the inner plate surface, the plate surface on the light incident surface 20a side of the light guide plate 20). The other side is attached. The rising portion 36b extends until the end opposite to the bottom surface 36a comes into contact with the back surface of the frame 14.

  The first support member 38 and the second support member 40 each have an elongated block shape extending along the long side direction (X-axis direction) of the chassis 22. The first support member 38 and the second support member 40 can be easily attached to and detached from the bottom surface portion 36 a of the heat radiating member 36. Of these, the first support member 38 is made of aluminum and has high thermal conductivity and light reflectivity. The first support member 38 is disposed between the light guide plate 20 (reflective sheet 26) and the heat dissipation member 36 in the vicinity of the light incident surface of the light guide plate 20. The first support member 38 is disposed between the first bottom surface portion 36a1 and the opposite plate surface 20c (reflection sheet 26) of the light guide plate 20, so that the surface 38a thereof is the opposite plate surface 20c (reflection) of the light guide plate 20. The light guide plate 20 is supported. Further, the surface 38b exposed to the LED 28 side of the first support member 38 is made to coincide with the light incident surface 20a of the light guide plate 20 in the Y-axis direction. Therefore, the LED 28 and the first support member 38 are close to each other, and the heat generated from the LED 28 is effectively transferred to the first support member 38 by heat radiation. In the first support member 38, the width W1 along the thickness direction (X-axis direction) of the LED substrate 30 is in the range of 5 mm to 30 mm.

  The second support member 40 is made of rubber and has a buffering property. The second support member 40 is disposed between the bottom surface portion 36a and the opposite plate surface 20c (reflective sheet 26) of the light guide plate 20 in the vicinity of the attachment portion 36a1 of the bottom surface portion 36a with the bottom plate 22a. The light guide plate 20 is disposed at a position away from the light incident surface 20a. Therefore, the second support member 40 is separated from the first support member 38. As described above, the second support member 40 supports the light guide plate 20 by being disposed between the bottom surface portion 36 a and the opposite plate surface 20 c (reflection sheet 26) of the light guide plate 20. In addition, since the second support member 40 is made of rubber, it has a function of absorbing vibration, thermal expansion, and the like of the light guide plate 20 and also has heat insulation properties, so that the LED 28 extends to the bottom surface portion 36a. It also has a function to prevent or suppress the transmitted heat from being transmitted to the reflection sheet 26 via the second support member 40, thereby preventing or suppressing the reflection sheet 26 from being bent by heat. Yes. The surfaces of the first support member 36a1 and the second support member 36a2 have the same height, and the opposite plate surface 20c (reflective sheet 26) of the light guide plate 20 is the plate surface of the bottom surface portion 36a and the plate surface of the bottom plate 22a. The light guide plate 20 is supported on the bottom surface portion 36a and the bottom plate 22a.

  Now, since the first support member 38 having high thermal conductivity is disposed between the vicinity of the light incident surface 20a of the light guide plate 20 and the bottom plate 22a of the chassis 22 as described above, of the heat generated from the LEDs 28. Most of the heat transferred by the heat radiation is transferred to the first support member 38 side. Thus, the heat transferred to the first support member 38 by the heat radiation is transferred to the bottom surface portion 36a, and is effectively transferred to the outside from the surface of the bottom surface portion 36a exposed to the outside of the backlight device 24. The heat is dissipated. Furthermore, since the optical member is disposed away from the light emitting surface of the light guide plate, the heat directed from the LED 28 toward the optical member 18 is reduced. Therefore, most of the heat generated from the LED 28 is transferred to the bottom surface 36a side through the first support member 38, and the end of the optical member 18 is bent by transferring the heat from the LED 28. Prevented or suppressed. In addition, since the light guide plate 20 is arranged in a state of being separated from the bottom surface portion 36a of the heat radiating member 36, the heat transmitted to the bottom surface portion 36a is difficult to be transmitted to the light guide plate 20 side by thermal radiation or the like. It is also prevented or suppressed that the reflection sheet 26 is bent by the heat transmitted from the bottom surface portion 36a.

  As described above, in the backlight device 24 according to the present embodiment, the light guide plate 20 is arranged away from the bottom surface portion 36a of the heat radiating member 36 and the bottom plate 22a of the chassis 22, so that the light guide plate 20 is guided from the bottom surface portion 36a and the bottom plate 22a. Heat can be prevented from being transmitted to the optical plate 20, whereby heat can be easily radiated from the bottom surface portion 36 a and the bottom plate 22 a to the outside. Furthermore, since the first support member 38 having heat dissipation is arranged at the end of the light guide plate 20 on the light incident surface 20a side, the distance between the LED 28 and the first support member 38 is close, The heat generated by the light emission of the LED 28 is transmitted to the first support member 38 by thermal radiation, and further transmitted to the bottom surface portion 36a of the heat radiating member 36 via the first support member 38, thereby exposing the bottom surface portion to the outside. The heat can be easily radiated from 36a. On the other hand, since the optical member 18 disposed on the light emitting surface 20b side of the light guide plate 20 is separated from the light emitting surface 20b, the heat from the LED 28 can be hardly transmitted to the optical member 18. . As a result, most of the heat from the LED 28 is transferred to the heat radiating member 18 through the first support member 38, so that the optical member 19 is prevented or suppressed from being bent by the heat from the LED 28. be able to.

  Further, the backlight device 24 according to the present embodiment supports the light guide plate 20 by being disposed between the bottom surface portion 36a and the opposite plate surface 20c in the vicinity of the attachment portion 36a1 of the bottom surface portion 36a with the bottom plate 22a. In addition, a second support member 40 that is spaced from the first support member 38 and has a cushioning property is further provided. According to this configuration, heat from the chassis 22 can be hardly transmitted to the light guide plate 20 side while effectively supporting the light guide plate 20, and vibration in the thickness direction (Z-axis direction) of the light guide plate 20 can be reduced. Further absorption can be achieved by the second support member 40.

  Further, in the backlight device 24 according to this embodiment, the width W1 along the thickness direction (Y-axis direction) of the LED substrate 30 in the first support member 38 is in the range of 5 mm to 30 mm. Here, if the width W1 of the first support member 38 along the thickness direction (Y-axis direction) of the LED substrate 30 is too small, the light guide plate 20 cannot be effectively supported, and the width W1 is large. If it is too much, the influence of heat received from the bottom surface of the heat radiating member 36 becomes large. According to said structure, the optimal magnitude | size for reducing the influence of the heat received from the bottom face part 36a while supporting the light-guide plate 20 can be provided.

  Moreover, in the backlight device 24 according to the present embodiment, the first support member 38 is made of aluminum and is made of metal. For this reason, the heat from the LED 28 is effectively transmitted to the second bottom surface portion 36a2 via the first support member 38.

  In the backlight device 24 according to the present embodiment, the mounting surface 30a of the LED substrate 30 and the first support member 38 each have light reflectivity. Thereby, the light emitted from the LED 28 and directed toward the first support member 38 is reflected by the first support member 38 toward the LED substrate 30, and the light reaching the LED substrate 30 is further reflected to be light incident surface 20 a. Since it goes to the side, the incident efficiency of the light radiate | emitted from LED28 can be improved.

In the backlight device 24 according to the present embodiment, the heat radiating member 36 has an L shape, the bottom surface portion 36a extends between the light guide plate 20 and the chassis 22, and the leading portion 36b is guided. The side opposite to the side facing the optical plate 20 is in contact with the side plate of the chassis 22. For this reason, the distance between the light incident surface 20a of the light guide plate 20 and the side plate 22b of the chassis 22 can be shortened, and the frame width of the backlight device 24 can be reduced.
<Modification of Embodiment 1>
Subsequently, a modification of the first embodiment will be described. In the modification, the first support member 38 is formed of the same material as the heat dissipation member 36, and the heat dissipation member 36 and the first support member 38 are integrally formed. With such a configuration, the first support member 38 is not required separately, so that the manufacturing process of the backlight device 24 can be simplified.

<Embodiment 2>
A second embodiment will be described with reference to the drawings. The second embodiment is different from the first embodiment in that a buffer member 139 is disposed between the first support member 138 and the light guide plate 120. 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. 5, 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 liquid crystal display device 110 according to the second embodiment, as shown in FIG. 5, a buffer having a cushioning property such as rubber between the first support member 138 and the opposite plate surface 120 c (reflective sheet 126) of the light guide plate 120. A member 139 is disposed. The surface of the buffer member 139 has the same height as the surface of the second support member 136a2. By providing such a buffer member 139, the buffer member 139 can absorb the vibration, thermal expansion, etc. of the light guide plate 120 due to the buffer property of the buffer member 139. Further, the buffer member 139 is made of rubber. Therefore, the heat transmitted from the LED 128 to the bottom surface portion 136a can be prevented or suppressed from being transmitted to the reflective sheet 126 via the first support member 138. The bending of 126 can also be prevented or suppressed.

<Embodiment 3>
Embodiment 3 will be described with reference to the drawings. The third embodiment is different from the first embodiment in that a part of the first support member 238 protrudes to the LED 228 side from the light incident surface 220a. 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. 6, the part obtained by adding the numeral 200 to the reference numeral in FIG. 4 is the same as the part described in the first embodiment.

  In the liquid crystal display device 210 according to the third embodiment, as illustrated in FIG. 6, the surface 238 b exposed to the LED 228 side of the first support member 238 is closer to the LED 228 than the light incident surface 220 b of the light guide plate 220 in the Y-axis direction. It's overhanging. That is, the first support member 238 has a protruding portion 238c that protrudes to the LED 228 side of the light incident surface 220b in a part thereof. With such a configuration, the distance between the LED 228 and the first support member 238 becomes closer, so that the heat generated by the light emission of the LED 228 is transferred to the first support member 238 by thermal radiation. It can be made easier to communicate.

<Embodiment 4>
Embodiment 4 will be described with reference to the drawings. The fourth embodiment is different from that of the third embodiment in that a protruding portion 338d is provided at the protruding portion 338c of the first support member 338. 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. 7, the part obtained by adding the numeral 300 to the reference numeral in FIG. 4 is the same as the part described in the first embodiment.

  As shown in FIG. 7, the liquid crystal display device 310 according to the fourth embodiment protrudes on the surface 338 a of the protruding portion 338 c of the first support member 338 on the optical member 318 side from the opposite plate surface 320 c of the light guide plate 320. A portion 338d is provided. The protruding portion 338d protrudes such that its inner surface (the light guide plate 320 side) is in contact with the light incident surface 320a of the light guide plate 320. Therefore, the protrusion 338d restricts the light incident surface 320a of the light guide plate 320 from expanding to the LED side. Since the first support member 338 is provided with such a protrusion 338c, the distance between the LED 328 and the light guide plate 320 is regulated by the protrusion 338d, and thus the distance between the LED 328 and the light guide plate 320. Can be kept constant, and the optical design of the backlight device 324 can be improved.

The modifications of the above embodiments are listed below.
(1) In each of the above embodiments, the light guide plate is exemplified as being supported by both the first support member and the second support member. However, the second support member is not disposed in the chassis, and the light guide plate is guided. The optical plate may be supported only by the first support member.

(2) In each of the above embodiments, the configuration in which the first support member is made of aluminum is exemplified. However, the first support member only needs to be made of a material having high thermal conductivity, such as iron or copper. It may be.

(3) In each of the above embodiments, the configuration in which the second support member and the buffer member are formed of rubber is exemplified, but the present invention is not limited to rubber. Even if it is other than rubber, it may be formed of a member having cushioning properties such as a thin cushion.

(4) In addition to the above embodiments, the shape and configuration of the first support member can be changed as appropriate.

(5) Besides the above embodiments, the shape and configuration of the second support member can be changed as appropriate.

(6) In each of the above embodiments, a liquid crystal display device using a liquid crystal panel as the display panel has been illustrated, but the present invention can also be applied to display devices using other types of display panels.

(7) In each of the above embodiments, a television receiver provided with a tuner has been exemplified. However, the present invention can also be applied to a display device that does not include a 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, 110, 210 ... liquid crystal display device, 12, 112, 212 ... frame 14, 114, 214 ... frame, 16, 116, 216 Liquid crystal panel, 18, 118, 218 ... Optical member, 20, 120, 220 ... Light guide plate, 20a, 120a, 220a ... Light incident surface, 22, 122, 222 ... Chassis, 24, 124, 224 ... Backlight device, 26, 126, 226 ... reflective sheet, 28, 128, 228 ... LED, 30, 130, 230 ... LED substrate, 32, 132, 232 ... LED unit, 36, 136, 236 ... heat dissipation member, 36a, 136a, 236a ... Bottom part, 36a1, 136a1, 236a1 ... mounting part, 36b, 136b, 236b ... standing Rising unit, 38,138,238 ... first support member, 40, 140, 240 ... second supporting member, 139 ... cushioning member, 238c, 338c ... protruding portion, 338d ... projecting portion

Claims (12)

A chassis having at least a bottom plate;
A light incident surface provided on at least one side surface, a light emitting surface provided on one plate surface, and a plate surface opposite to the light emitting surface, a part of which faces the bottom plate An opposite plate surface, and a light guide plate, the opposite plate surface being disposed apart from the bottom plate,
A light source disposed opposite the light incident surface;
An optical member disposed on the light emitting surface side away from the light emitting surface;
A light source substrate having the light source disposed on one surface;
On the opposite plate surface side, a plate shape is formed from the side facing the light source toward the center of the light guide plate so that one plate surface is separated from the opposite plate surface and the other plate surface is exposed to the outside. The bottom end of the bottom plate attached to the end of the bottom plate, and a plate that rises from the side of the bottom surface facing the light source toward the optical member, and one plate A rising portion whose surface is in contact with the plate surface opposite to the side on which the light source of the light source substrate is disposed, and a heat dissipation member having heat dissipation,
A first support member that has heat dissipation and at least a part of the first support member that supports the light guide plate by being disposed between the bottom surface portion and the end of the opposite plate surface on the light incident surface side;
A lighting device comprising:   The lighting device according to claim 1, wherein a buffer member having a buffer property is disposed between the first support member and the opposite plate surface.   The light guide plate is supported by being disposed between the bottom surface portion and the opposite plate surface in the vicinity of the attachment portion of the bottom surface portion with the bottom plate, and is separated from the first support member and has a buffering property. The lighting device according to claim 2, further comprising a second support member having the following.   4. The lighting device according to claim 1, wherein the first support member has a protruding portion that protrudes to the light source side with respect to the light incident surface in a part of the first supporting member. 5.   5. The lighting device according to claim 4, wherein a protruding portion that protrudes toward the optical member from the opposite plate surface and contacts the light incident surface is provided at the protruding portion.   The lighting device according to any one of claims 1 to 5, wherein a width along a thickness direction of the light source substrate in the first support member is set in a range of 5 mm to 30 mm.   The lighting device according to any one of claims 1 to 6, wherein the first support member is made of metal.   The lighting device according to any one of claims 1 to 7, wherein the first support member is integrally formed with the heat dissipation member.   The plate surface of the light source substrate on the side where the light source is disposed and the first support member each have light reflectivity. 9. Lighting equipment.   A display apparatus provided with the display panel which displays using the light from the illuminating device of any one of Claims 1-9.   The display device according to claim 10, wherein the display panel is a liquid crystal panel using liquid crystal.   A television receiver comprising the display device according to claim 10.

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