WO2013038977A1

WO2013038977A1 - Illumination device, display device, and television reception device

Info

Publication number: WO2013038977A1
Application number: PCT/JP2012/072695
Authority: WO
Inventors: 信宏笠井
Original assignee: シャープ株式会社
Priority date: 2011-09-13
Filing date: 2012-09-06
Publication date: 2013-03-21

Abstract

This backlight device (24) is provided with the following: a chassis (22) that has a bottom plate (22a); a light-guide plate (20) disposed on the front-surface side of the bottom plate (22a), with light-input surfaces (20a) provided on the sides of said light-guide plate; LED light sources (28) facing said light-input surfaces (20a); LED substrates (30), with the LED light sources (28) disposed on the front surfaces thereof; and heat-dissipation members (36) that dissipate heat from the LED substrates (30). Each heat-dissipation member (36) is provided with the following: a contact section that contacts the underside of that LED substrate (30); covering sections (30b) that extend onto the front-surface side of that LED substrate (30) from both ends of the aforementioned contact section and cover parts of the front surface of that LED substrate (30) where the LED light source is not; and clamp sections that extend from the covering sections (30b) and clamp the ends of the light-guide plate (20) in the thickness direction thereof.

Description

Lighting device, display device, and television receiver

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 such a backlight device, the end of the light guide plate may be warped due to heat or the like. When the warpage of the light guide plate end portion occurs, the distance between the light source and the light guide plate may change, and the optical characteristics of the backlight device may deteriorate.

Patent Document 1 discloses an edge light type backlight device in which warpage of an end portion of a light guide plate is prevented or suppressed. This backlight device has a concave member that regulates the position of the light guide plate in the thickness direction by sandwiching the end portion of the light guide plate in the thickness direction. A light source substrate on which a light source is mounted is disposed on the bottom surface of the concave portion of the concave member. According to this backlight device, the concave member restricts the position of the light guide plate in the thickness direction at the end of the light guide plate, so that warpage of the light guide plate end is prevented or suppressed.

JP 2010-135297 A

(Problems to be solved by the invention)
However, in the backlight device of Patent Document 1, since the plate surface on which the light source of the light source substrate is arranged is exposed to the light guide plate, the heat generated on the plate surface is difficult to dissipate. For this reason, the heat generated in the light source substrate may not be sufficiently dissipated.

The technology disclosed in this specification has been created in view of the above problems. An object of the technology disclosed in the present specification is to provide an illuminating device that can improve heat dissipation of a light source substrate while preventing or suppressing warpage of a light guide plate end.

(Means for solving the problem)
The technology disclosed in this specification includes a chassis having at least a plate-shaped portion, a light incident surface provided on a side surface, a light guide plate disposed on one surface side of the plate-shaped portion, and the light incident surface. A light source disposed oppositely, a light source substrate on which one of the light sources is disposed, and a heat dissipating member that dissipates heat from the light source substrate, the contact portion being in contact with the other surface of the light source substrate And extending from both ends of the contact portion to the one surface side of the light source substrate, covering a portion where the light source is not disposed on the one surface side of the light source substrate, and extending from the cover portion, A heat radiating member provided with the clamping part which clamps the edge part of the said light-guide plate in the thickness direction, and relates to an illuminating device provided with.

According to the above illumination device, since the end portion of the light guide plate is sandwiched in the thickness direction by the sandwiching portion, the warp of the end portion of the light guide plate can be prevented or suppressed. Further, since the cover portion covers a portion of the plate surface on which the light source of the light source substrate is disposed, where the light source is not disposed, the heat generated in the light source substrate is easily transmitted to the heat radiating member. For this reason, the heat dissipation of a light source board | substrate can be improved, preventing or suppressing the curvature of a light-guide plate edge part.

The covering portion may be in contact with a portion where the light source is not disposed on the one surface side of the light source substrate.
According to this configuration, the contact area between the light source substrate and the heat radiating member can be increased as compared with the case where one surface of the light source substrate is not in contact with the heat radiating member (when covering with a slight gap). , Heat dissipation can be improved.

The light source substrate may have a rectangular shape, and a portion of the heat dissipation member that is continuous with the contact portion and the cover portion may be in contact with a side surface in the long side direction of the light source substrate.
According to this configuration, the contact area between the light source substrate and the heat radiating member can be increased as compared with the configuration in which the side surface in the long side direction of the light source substrate is not in contact with the heat radiating member. be able to.

The sandwiching portion may sandwich the light guide plate so that the distance between the light source and the light incident surface can be regulated.
According to this configuration, even when the light guide plate is thermally expanded, the distance between the light source and the light incident surface can be kept constant by the sandwiching portion, so that good optical characteristics can be maintained.

One of the surfaces of the light guide plate is a light exit surface, the reflection is provided on the opposite side of the light guide plate from the light exit surface, and has an extending portion extending toward the light source from the light entrance surface. A sheet may be further provided, and the extension part of the reflection sheet may be laid on the clamping part.
According to this structure, the extension part of a reflection sheet can be made hard to warp because the extension part of a reflection sheet is laid on a clamping part.

The heat dissipating member includes a bottom surface portion that extends from the contact portion and is disposed along one surface of the plate-like portion. In the plate-like portion of the chassis, a portion that faces the light guide plate and the heat dissipating member A step may be provided between the bottom portion of the member and the portion facing the bottom portion.
According to this configuration, since the light guide plate can be sandwiched simply by extending the cover portion toward the light guide plate, the configuration of the heat dissipation member can be simplified.

A reflective member may be disposed on a surface of the heat radiating member that is exposed to a space between the light source and the light incident surface.
According to this configuration, the light emitted from the light source and directed in the direction deviating from the direction toward the light incident surface can be reflected to the light incident surface side by the reflecting member, so that the light emitted from the light source is incident. Light efficiency can be increased.

The reflective member may be formed of a sheet-like foamed PET. Alternatively, it may be formed of an electrostatic multilayer film. Or you may form directly on the said heat radiating member. In this case, the reflection member may be formed by printing or vapor deposition on the heat dissipation member.
According to these structures, the specific structure of a reflection member is realizable.

The chassis may include a side plate that rises from an edge of the plate-like portion, and a part of the heat dissipation member may be in contact with the side plate.
According to this configuration, heat can be more easily transferred to the chassis than in the case where a part of the heat radiating member is not in contact with the side plate, so that the heat dissipation of the lighting device can be improved.

The light source may be a white light emitting diode.
According to this configuration, the life of the light source can be extended and the power consumption can be reduced.

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.

(The invention's effect)
According to the technology disclosed in the present specification, it is possible to provide an illumination measure that can improve the heat dissipation of the light source substrate while preventing or suppressing warpage of the light guide plate end.

1 is an exploded perspective view of a television receiver TV according to Embodiment 1. FIG. An exploded perspective view of the liquid crystal display device 10 is shown. A cross-sectional view of the liquid crystal display device 10 is shown. FIG. 3 shows an enlarged cross-sectional view of the main part in the vicinity of one heat radiating member 36. The principal part sectional drawing of the backlight apparatus 112 which concerns on Embodiment 2 is shown. The principal part sectional drawing of the backlight apparatus 212 which concerns on Embodiment 3 is shown. The principal part sectional drawing of the backlight apparatus 312 which concerns on Embodiment 4 is shown.

<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 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.

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 as a display panel and a backlight device 24 as an external light source, and these form a bezel having a frame shape. 12 and the like are integrally held.

Subsequently, 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 enclosed 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. Among 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 driving circuit board (not shown). A polarizing plate (not shown) is disposed outside both glass substrates.

Subsequently, 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 16 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 emitting side, liquid crystal panel 11 side).

In the chassis 22, a pair of

heat radiating members

36, 36, a pair of light emitting diode (LED)

units

32, 32, the reflection sheet 26, and the light guide plate 20 are accommodated. The pair of

heat radiating members

36 and 36 are arranged extending in the long side direction of the chassis 22. The configuration of the heat dissipation member 36 will be described in detail later. The pair of

LED units

32, 32 extend in the long side direction of the chassis 22, are arranged on the long side of the chassis 22 and inside the heat dissipation member 36, and are on the light incident surface 20 a side of the light guide plate 20. Light is emitted toward. The longitudinal side surface (light incident surface) 20a of the light guide plate 20 is disposed at a position facing the

LED units

32 and 32, and guides the 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 arranged directly below the liquid crystal panel 16 and the LED unit 32 that is a light source is arranged at 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, for example, a metal such as an aluminum-based material, and includes a bottom plate 22a having a rectangular shape in plan view, a side plate 22b rising from both outer edges of both long sides of the bottom plate 22a, and outer edges of both short sides of the bottom plate 22a. It consists of a side plate that rises. A space facing the

LED units

32, 32 in the chassis 22 is a housing space for the light guide plate 20. Further, the end of the bottom plate 22 a of the chassis 22 on the side where the LED light source 28 is disposed is recessed on the side opposite to the light exit surface 20 b of the light guide plate 20. In other words, a step is provided on the bottom plate 22a of the chassis 22 between a portion facing the light guide plate 20 and a portion facing the bottom surface portion 36a (see FIG. 4) of the heat radiating member 36. 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 18 c, and the optical member 18 is disposed between the light guide plate 20 and the liquid crystal panel 16.

The LED unit 32 has a configuration in which LED light sources 28 that emit white light are arranged in a row on the plate surface of the light guide plate 20 of the LED substrate 18 that faces the light incident surface 20a. The LED substrate 30 is disposed in a state where the plate surface opposite to the plate surface on which the LED light source 28 is disposed is in contact with the contact portion 36 b of the heat radiating member 36. The LED light source 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 light source 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 reflection sheet 26 is made of synthetic resin, the surface thereof is white with excellent light reflectivity, and is placed on the front side of the bottom plate 22 a of the chassis 22. The reflection sheet 26 has a reflection surface on the front side, and this reflection surface is in contact with the opposite plate surface 20c of the light guide plate 20, and leaks from the

LED units

32 and 32 or the light guide plate 20 to the opposite plate surface 20c side. It is possible to reflect light. The end of the reflection sheet 26 on the light incident surface 20a side slightly extends outward (the LED substrate 30 side) from the light incident surface 20a, and serves as an extended portion 26a.

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. 2 and 3, the light guide plate 20 is a plate opposite to the light output surface 20b, with the light output surface 20b being the main plate surface facing the diffusion sheet 18a between the pair of

LED units

32 and 32. The opposite plate surface 20c, which is a surface, is arranged so as to face the reflection sheet 26 side. By arranging such a light guide plate 20, the light generated from the LED unit 32 enters from the light incident surface 20 a of the light guide plate 20 and exits from the light exit surface 20 b facing the diffusion sheet 18 a, The liquid crystal panel 16 is irradiated from the back side.

Next, the configuration of the heat radiating member 36, which is a main part of the present embodiment, will be described in detail. Here, FIG. 4 shows an enlarged cross-sectional view of the main part in the vicinity of one heat radiating member 36 in FIG. The pair of

heat radiating members

36 and 36 are members having heat radiating properties, and are arranged along the long side direction of the chassis 22. The bottom surface portion 36 a, the contact portion 36 b, the pair of

cover portions

36 c and 36 c, The sandwiching

portions

36d and 36d (see FIGS. 3 and 4). The bottom surface portion 36a is disposed in contact with the bottom plate 22a along the bottom plate 22a of the chassis 22, and is attached to the bottom plate 22a by, for example, an adhesive tape and fixed to the bottom plate 22a. The contact portion 36b rises perpendicularly to the bottom surface portion 36a from the bottom surface portion 36a toward the front side of the chassis 22, and has a plate shape in which the plate surface is parallel to the light incident surface 20a of the light guide plate 20. ing. And the contact part 36b is contact | abutted with the board surface on the opposite side to the side by which the LED light source 28 of LED board 30 was distribute | arranged. The upper end of the contact portion 36b is located at the same height as the side surface located on the upper side in the long side direction of the LED substrate 30, and is parallel to the bottom surface portion 36a from the upper end of the contact portion 36b toward the light guide plate 20 side. An extending portion extending in the direction is provided.

The pair of

cover portions

36c and 36c extend from the tip of the bottom surface portion 36a on the light guide plate 20 side and the upper end of the contact portion 36b, respectively. One cover portion 36c extends from the front end of the bottom surface portion 36a on the light guide plate 20 side toward the front side of the chassis 22, and of the plate surface of the LED substrate 30 on which the LED light source 28 is disposed, is more than the LED light source 28. The lower part (the part where the LED light source 28 is not disposed) is covered. The other cover portion 36c extends from the upper end of the contact portion 36b toward the back side of the chassis 22 and is a portion of the LED board 30 on which the LED light source 28 is disposed above the LED light source 28 ( A portion where the LED light source 28 is not disposed). In addition, both the

cover parts

36c and 36c are extended to the position where the front-end | tip is equal to the light emission surface 20b of the light-guide plate 20, and the opposite plate surface 20c in the thickness direction of the light-guide plate 20, respectively. Thus, since the cover part covers the portion of the LED substrate 30 where the LED light source 28 is not disposed, the heat generated on the LED substrate 30 is not easily transmitted to the light guide plate 20 side, but is transmitted to the heat radiating member 36 side. It has an easy configuration.

The pair of sandwiching

portions

36d and 36d extend perpendicularly to the light incident surface 20a from the tip of the cover portion 36c toward the light incident surface 20a side of the light guide plate 20, respectively. Both the sandwiching

portions

36d, 36d extend until their tips come into contact with the light exit surface 20b and the opposite plate surface 20c at the end of the light guide plate 20 on the light incident surface 20a side. And the edge part by the side of the light-incidence surface 20a of the light-guide plate 20 is clamped by this clamping part 36d in the thickness direction. As a result, warping of the end portion of the light guide plate 20 on the light incident surface 20a side is prevented or suppressed by the sandwiching portion 36d. Further, the sandwiching portion 36d sandwiches the light guide plate 20 so that the distance between the LED light source 28 and the light incident surface 20a can be regulated. In other words, the sandwiching portion 36d regulates the light guide plate 20 in the plate surface direction (XY plane direction) by a force for sandwiching the light guide plate 20 in the thickness direction.

In the heat dissipation member 36, the portion of the bottom surface portion 36 that faces the side surface in the long side direction of the LED substrate 30 and the extension portion that faces the side surface in the long side direction of the LED substrate 30 are the length of the LED substrate 30, respectively. It is in contact with the side surface in the side direction. In addition, the extending portion 26a of the reflection sheet 26 is configured to be laid on the sandwiching portion 36d disposed on the lower side of the pair of sandwiching

portions

36d and 36d.

As described above, in the backlight device 24 according to the present embodiment, since the end portion of the light guide plate 20 is sandwiched in the thickness direction by the sandwiching portion 36d, warping at the end portion of the light guide plate 20 can be prevented or suppressed. . Furthermore, since the cover part 36c covers the part of the plate surface of the LED substrate 30 where the LED light source 28 is disposed, where the LED light source 28 is not disposed, the heat generated in the LED substrate 30 is easily transmitted to the heat radiating member 36. It has become. For this reason, the heat dissipation of the LED substrate 30 can be enhanced while preventing or suppressing warping of the end portion of the light guide plate 20.

In the backlight device 24 according to the present embodiment, the LED substrate 30 has a rectangular shape, and the portion of the heat radiating member 36 that is continuous with the contact portion 36b and the cover portion 36c is a side surface in the long side direction of the LED substrate 30. Abut. For this reason, the contact area of the LED board 30 and the heat radiating member 36 can be increased compared with the case where the side surface of the long side direction of the LED board 30 is not contact | abutting with the heat radiating member 36, and heat dissipation is improved. Can be made.

Further, in the backlight device 24 according to the present embodiment, the sandwiching portion 30d sandwiches the light guide plate 20 so that the distance between the LED light source 28 and the light incident surface 20a can be regulated. For this reason, even when the light guide plate 20 is thermally expanded, the distance between the LED light source 28 and the light incident surface 20a can be kept constant by the sandwiching portion 36d, and good optical characteristics can be maintained. it can.

In the backlight device 24 according to the present embodiment, one plate surface of the light guide plate 20 is a light exit surface 20b, and is laid on the opposite side to the light exit surface 20b of the light guide plate 20, and from the light entrance surface 20a. The reflective sheet 26 further includes an extended portion 26a extending toward the LED light source 28, and the extended portion 26a of the reflective sheet 26 is laid on the sandwiching portion 36d. As described above, the extending portion 26a of the reflecting sheet 26 is laid on the sandwiching portion 36d, so that the extending portion 26a of the reflecting sheet 26 is unlikely to warp toward the sandwiching portion 36d.

Further, in the backlight device 24 according to the present embodiment, the heat dissipation member 36 includes a bottom surface portion 36a that extends from the contact portion 36b and is disposed along one surface of the bottom plate 22a. In the bottom plate 22a of the chassis 22, A step is provided between a portion facing the light guide plate 20 and a portion facing the bottom surface portion 36 a of the heat radiating member 36. For this reason, since it can be set as the structure which can clamp the light-guide plate 20 only by extending the cover part 36c to the light-guide plate 20 side, the structure of the thermal radiation member 36 can be simplified.

<Embodiment 2>
A second embodiment will be described with reference to the drawings. FIG. 5 is a cross-sectional view of a main part of the backlight device 124 according to the second embodiment. The second embodiment is different from the first embodiment in the configuration of the cover of the heat dissipating member. 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 backlight device according to the second embodiment, as shown in FIG. 5, the LED light source 128 of the LED substrate 130 is arranged on the inner surface (the surface facing the plate surface of the LED substrate 130) of the cover portion 136 c of the heat radiating member 136. The plate surface (the plate surface facing the light incident surface 120a of the light guide plate 120) is in contact with a portion where the LED light source 128 is not disposed. With such a configuration, the LED substrate 130, the heat dissipation member 136, and the LED substrate 130 are compared with the case where one surface of the LED substrate 130 is not in contact with the heat dissipation member 136 (when the LED substrate 130 is covered with a slight gap). Therefore, the heat dissipation of the backlight device 124 can be improved.

<Embodiment 3>
Embodiment 3 will be described with reference to the drawings. FIG. 6 is a cross-sectional view of a main part of the backlight device 224 according to the third embodiment. The third embodiment is different from the first embodiment in that a reflection member 240 is disposed inside the heat dissipation member 236. 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 200 to the reference numeral in FIG. 4 is the same as the part described in the first embodiment.

In the backlight device 224 according to the third embodiment, as illustrated in FIG. 6, the light is reflected on the surface of the heat radiating member 236 that is exposed to the space between the LED light source 228 and the light incident surface 220 a of the light guide plate 220. A reflection member 240 is disposed. The reflecting member 240 is made of, for example, a sheet-like foamed PET. With such a configuration, the light emitted from the LED light source 228 and directed in the direction deviating from the direction toward the light incident surface 220a of the light guide plate 220 is reflected by the reflecting member 240 toward the light incident surface 220a. be able to. Thereby, the incident efficiency of the light radiate | emitted from the LED light source 228 can be improved.

<Embodiment 4>
Embodiment 4 will be described with reference to the drawings. FIG. 7 is a cross-sectional view of a main part of the backlight device 324 according to the fourth embodiment. The third embodiment is different from that of the first embodiment in that the contact portion 336b of the heat dissipation member 336 is in contact with the side plate 322b of the chassis 322. 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 backlight device according to the fourth embodiment, as shown in FIG. 7, there is no portion extending to the side plate 322b side (the side opposite to the light guide plate 320) of the chassis 322 in the bottom surface portion 336a as in the first embodiment. . The back surface of the contact portion 336b (the surface opposite to the surface on which the LED substrate 330 is disposed) is in contact with the side plate 322b of the chassis 322. With such a configuration, heat can be more easily transferred to the chassis 322 than in the case where a part of the heat radiating member 336 is not in contact with the side plate 322b. Can be increased.

The correspondence between the configuration of each embodiment and the configuration of the present invention is described. The

bottom plates

22a, 122a, 222a, and 322a are examples of “plate portions”. The

LED light sources

28, 128, 228, and 328 are examples of “light sources”. The LED substrates 30, 130, 230, and 330 are examples of the “light source substrate”. The backlight devices 24, 124, 224, and 324 are examples of “illumination devices”. The liquid

crystal display devices

10, 110, 210, and 310 are examples of the “display device”.

The modifications of the above embodiments are listed below.
(1) In each of the above embodiments, the configuration in which the side surface in the long side direction of the LED substrate is in contact with the heat radiating member is illustrated, but the configuration in which the side surface of the LED substrate is separated from the heat radiating member may be employed.

(2) In each of the above embodiments, the configuration in which the top surface of the heat radiating member is in contact with the frame is exemplified. However, the top surface of the heat radiating member may be separated from the frame.

(3) In Embodiment 3 described above, the configuration in which the reflective member is formed of sheet-like foamed PET is exemplified, but the configuration in which the reflective member is formed of an electrostatic multilayer film may be used. Alternatively, the reflection member may be formed directly on the heat dissipation member. In this case, the reflection member may be formed by printing or vapor deposition on the heat dissipation member.

(4) Besides the above embodiments, the configuration, shape, arrangement, and the like of the heat dissipation member can be changed as appropriate.

(5) 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.

(6) In each of the above embodiments, the television receiver provided with the tuner is exemplified, but 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.

Further, the technical elements described in this specification or the 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, 310: liquid crystal display, 12, 112, 212, 312: bezel, 14, 114, 214, 314: Frame, 16, 116, 216, 316: Liquid crystal panel, 18, 118, 218, 318: Optical member, 20, 120, 220, 320: Light guide plate, 20a, 120a, 220a, 320a: Light incident surface, 20c, 120c , 220c, 320c: opposite plate surface, 22, 122, 222, 322: chassis, 24, 124, 224, 324: backlight device, 26, 126, 226, 326: reflection sheet, 28, 128, 228, 328: LED light source, 30, 130, 230, 330: LED substrate, 32, 132, 232, 332: LED Knit, 36,136,236,336: the heat radiating member

Claims

A chassis having at least a plate-like portion;
A light incident surface is provided on a side surface, and a light guide plate disposed on one surface side of the plate-like portion;
A light source disposed facing the light incident surface;
A light source substrate having the light source disposed on one surface;
A heat dissipating member for dissipating heat of the light source substrate, the contact portion being in contact with the other surface of the light source substrate, and extending from both ends of the contact portion to the one surface side of the light source substrate; A heat radiating member comprising: a cover portion that covers a portion where the light source is not disposed on one surface side of the substrate; and a sandwiching portion that extends from the cover portion and sandwiches an end portion of the light guide plate in its thickness direction;
A lighting device comprising:
2. The illumination device according to claim 1, wherein the covering portion is in contact with a portion on the one surface side of the light source substrate where the light source is not disposed.
The light source substrate has a rectangular shape;
3. The lighting device according to claim 1, wherein a portion of the heat radiating member that is continuous with the contact portion and the cover portion is in contact with a side surface in a long side direction of the light source substrate. .
The said clamping part clamps the said light-guide plate so that the distance between the said light source and the said light-incidence surface can be controlled, The any one of Claims 1-3 characterized by the above-mentioned. Lighting equipment.
One plate surface of the light guide plate is a light exit surface,
A reflection sheet that is laid on the opposite side of the light guide surface of the light guide plate and has an extending portion that extends to the light source side than the light incident surface;
The lighting device according to any one of claims 1 to 4, wherein the extending portion of the reflection sheet is laid on the clamping portion.
The heat dissipation member includes a bottom surface portion that extends from the contact portion and is disposed along one surface of the plate-shaped portion,
6. A step is provided in the plate-like portion of the chassis between a portion facing the light guide plate and a portion facing the bottom surface portion of the heat radiating member. The illumination device according to any one of the above.
7. The reflection member is disposed on a surface exposed to a space between the light source and the light incident surface of the heat radiating member. Lighting equipment.
The lighting device according to claim 7, wherein the reflecting member is formed of a sheet-like foamed PET.
The lighting device according to claim 7, wherein the reflecting member is formed of an electrostatic multilayer film.
The lighting device according to claim 7, wherein the reflecting member is directly formed on the heat radiating member.
The chassis has a side plate that rises from an edge of the plate-like portion;
The lighting device according to any one of claims 1 to 10, wherein a part of the heat radiating member is in contact with the side plate.
The lighting device according to any one of claims 1 to 11, wherein the light source is a white light emitting diode.
A display device comprising a display panel that performs display using light from the illumination device according to any one of claims 1 to 12.
The display device according to claim 13, wherein the display panel is a liquid crystal panel using liquid crystal.
A television receiver comprising the display device according to claim 13 or 14.