WO2012070499A1 - Illumination device, display device, and television receiver device - Google Patents

Abstract

The backlight device according to the present invention includes: an LED substrate (30); an LED light source (28) arranged on the surface of the LED substrate (30); a light guide plate that has a light entrance surface on the side surface thereof and that guides the light from the LED light source (28); a heat radiation plate (33) that retains the LED substrate (30) and that has a greater heat radiation efficiency than the LED substrate (30); and a chassis that houses at least the LED substrate (30), the light guide plate, and the heat radiation plate (33). A protrusion (40) protruding toward the heat radiation plate (33) is provided on the plate surface of the LED substrate (30). A recess (42) into which the protrusion (40) can be fitted is provided in the plate surface of the heat radiation plate (33) that is in opposition to the protrusion (40). The LED substrate (30) is retained by the heat radiation plate (33) by fitting the protrusion (40) into the recess (42).

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.

A light source substrate, a light source disposed on the surface of the light source substrate, a light guide plate that guides light from the light source, a housing member that accommodates the light source substrate and the light guide plate, and a large heat dissipation efficiency compared to the light source substrate There is known a backlight device including a heat radiating plate that realizes attachment to a housing member by holding a light source substrate. In such a backlight device, since heat generated from the light source is radiated to the outside of the housing member via the heat radiating plate, a high heat radiating effect can be obtained. Such a backlight device is disclosed in Patent Document 1, for example.

JP 2010-177076 A

(Problems to be solved by the invention)
However, in the backlight device of Patent Document 1, the light source substrate is attached to and held by the heat sink by screwing the light source substrate to the heat sink. In this case, since the plate surfaces of the light source substrate and the heat sink are in contact with each other, the surface area of the contact interface between the light source substrate and the heat sink is limited to the area of the plate surface of the light source substrate. For this reason, the heat generated from the light source cannot be sufficiently transmitted to the heat radiating plate, and sufficient heat dissipation may not be obtained.

The present invention has been created in view of the above problems. An object of the present invention is to provide a technique capable of improving the heat dissipation of heat generated from a light source in an edge light type illumination device in which a light source substrate is held by a heat radiating plate.

(Means for solving problems)
The technology disclosed in the present specification includes a light source substrate, a light source disposed on the surface of the light source substrate, a light incident surface provided on a side surface, and guides light from the light source, A heat radiating plate that holds a light source substrate and has a large heat radiating efficiency compared to the light source substrate; and a housing member that houses at least the light source substrate, the light guide plate, and the heat radiating plate. A convex portion that protrudes toward the other is provided on one plate surface of the plate, and a concave portion that can be fitted to the convex portion is provided on a plate surface that faces the other convex portion, and the light source substrate Relates to a lighting device that is held by the heat sink by fitting the concave portion and the convex portion.

According to the above illumination device, the light source substrate is held by the heat sink by fitting the convex portion provided on one of the light source substrate and the heat sink and the concave portion provided on the other. However, the surface area of the contact interface between the light source substrate and the heat sink can be increased as compared with the case where the heat sink is held on the heat sink by screwing or the like. Thereby, the heat generated from the light source can be effectively transmitted from the light source substrate to the heat radiating plate, and the heat dissipation of the heat generated from the light source can be improved.

The concave portion is provided in a groove shape along the other plate surface, and has an open portion opened to at least one outer edge of the plate surface, and the convex portion is a straight line along the one plate surface. It may be provided in a shape and can be fitted to the recess by sliding from the opening of the recess.
According to this configuration, since the light source substrate can be attached to the heat radiating plate by sliding the light source substrate, the light source substrate attachment process at the time of manufacture can be facilitated.

The convex part may have a part larger than the width of the opening of the concave part in a part thereof.
According to this configuration, the concave portion cannot be fitted into the concave portion by pushing the convex portion into the concave portion, and the concave portion and the convex portion are fitted only by sliding the light source substrate from the open portion. Can be made. For this reason, it can prevent thru | or suppress that a convex part remove | deviates from the opening side of a recessed part, and can make it difficult to remove a light source substrate from a heat sink.

The light source substrate may be fixed to the heat radiating plate by screwing at least one of both end portions of the plate surface in the sliding direction with the end portion of the heat radiating plate. Alternatively, the light source substrate may be fixed to the heat radiating plate by tape-bonding at least one of both end portions of the plate surface in the sliding direction to the end portion of the heat radiating plate.
When the light source substrate is slid and attached to the heat sink, there is a possibility that the light source substrate may move in the sliding direction. According to said structure, it can prevent thru | or suppress moving in a sliding direction by screwing or tape-fastening at least one of the both ends in the direction to which a light source substrate is slid, and a light source substrate can be removed from a heat sink. It can be difficult to come off.

The open portion may be provided only on one outer edge of the plate surface on which the concave portion is provided.
According to this configuration, it is only necessary to perform screwing or tape fastening only on the outer edge of the plate surface provided with the concave portion on the side where the open portion is provided, so that screwing or tape fastening work can be facilitated.

Of the light source substrate and the heat radiating plate, the one coefficient of thermal expansion provided with the convex portion may be larger than the coefficient of thermal expansion of the other provided with the concave portion.
According to this configuration, the gap between the concave portion and the convex portion can be narrowed by thermally expanding the convex portion with the concave portion and the convex portion being fitted, and the adhesion between the concave portion and the convex portion is improved. Can do. As a result, the heat dissipation of the heat generated from the light source can be further improved.

The heat radiating plate may include a bottom surface portion and a side surface portion that rises from one outer edge of the bottom surface portion, and may have a substantially L shape in a sectional view.
According to this structure, since the bottom part of a heat sink can be fixed to a chassis and a light source substrate can be attached to the side part of a heat sink, the suitable shape of a heat sink can be implement | achieved.

The light source substrate may have the entire surface facing the side surface portion in contact with the side surface portion.
According to this configuration, the surface area of the contact interface between the light source substrate and the heat radiating plate can be further increased, and the heat dissipation of the heat generated from the light source can be further improved.

The light source substrate may have the entire surface facing the bottom surface portion in contact with the bottom surface portion.
According to this configuration, in the light source substrate, not only the surface facing the side surface portion of the heat radiating plate but also the surface facing the bottom surface portion of the heat radiating plate is in contact with the heat radiating plate. The surface area of the contact interface can be further increased, and the heat dissipation of the heat generated from the light source can be further improved.

You may provide the said some recessed part and the some said convex part which can be fitted to each of this some recessed part.
According to this configuration, by providing a plurality of concave portions and convex portions, the surface area of the contact interface between the light source substrate and the heat radiating plate can be further increased, and the heat dissipation of the heat generated from the light source can be further improved.

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 display device and the television set described above, the display area can be increased.

(The invention's effect)
According to the technology disclosed in this specification, in an edge light type lighting device in which a light source substrate is held by a heat dissipation plate, heat dissipation of heat generated from the light source can be improved.

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. Sectional drawing of the LED board 30 and the heat sink 33 is shown. The perspective view of LED board 30 and the heat sink 33 is shown. The top view of the LED board 30 and the heat sink 33 is shown. The top view which expanded the edge part of the LED board 30 and the heat sink 33 is shown. Sectional drawing of the LED board 80 and heat sink 83 which concern on Embodiment 2 is shown. The top view which expanded the edge part of LED board 80 and the heat sink 83 is shown. Sectional drawing of the LED board 130 and heat sink 133 which concern on Embodiment 3 is shown. Sectional drawing of the LED board 180 which concerns on Embodiment 4, and the heat sink 183 is shown. Sectional drawing of the LED board 230 and the heat sink 233 which concern on the modification 1 of Embodiment 4 is shown. Sectional drawing of the LED board 280 and the heat sink 283 which concern on the modification 2 of Embodiment 4 is shown. Sectional drawing of the LED board 330 and heat sink 333 which concern on Embodiment 5 is shown. The perspective view of the LED board 380 and heat sink 383 which concern on Embodiment 6 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 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.

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 14 has a frame shape 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).

In the chassis 22, a pair of heat radiation plates 33, 33, a pair of LED (Light Emitting Diode) units 32, 32, a reflection sheet 26, and a light guide plate 20 are accommodated. The heat radiating plate 33 extends along the long side direction of the chassis 22 and has an L-shaped horizontal section. The heat radiating plate 33 is disposed on the long side outer edges (side plates) 22 b and 22 c of the chassis 22. The LED unit 32 extends along the long side direction of the chassis 22 and emits light. Specifically, the LED unit 32 is held inside the heat radiating plate 33 with the light emitting side facing inward (see FIG. 3). The longitudinal side surface (light incident surface) 20a of the light guide plate 20 is disposed at a position facing the light emitting side of the LED unit 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 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 unit 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 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 a resin-made rectangular LED board 30. The LED substrate 30 is fixed to the side plates 22b and 22c of the chassis 22 by screws or the like. 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 surface 20c of the light guide plate 20, and light leaked from the LED units 32, 32 or the light guide plate 20 to the opposite surface 20c side. It can be reflected.

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 output surface 20b as a main plate surface facing the diffusion sheet 18a between the LED unit 26 and one side plate 22c of the chassis 22, and is opposite to the light output surface 20b. Is arranged in such a manner that its opposite surface 20c faces 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 diffusion sheet 18 a, The liquid crystal panel 16 is irradiated from the back side.

Next, the configuration of the heat sink 33, the configuration of the LED substrate 30, and the configuration in which the LED substrate 30 is held with respect to the heat sink 33 will be described. FIG. 4 shows a cross-sectional view of the LED substrate 30 and the heat radiating plate 33. FIG. 5 is a perspective view of the LED substrate 30 and the heat radiating plate 33. FIG. 6 shows a plan view of the LED substrate 30 and the heat sink 33. FIG. 7 shows a plan view in which end portions of the LED substrate 30 and the heat radiating plate 33 are enlarged.

The heat radiating plate 33 is formed of a material having a smaller coefficient of thermal expansion than the LED substrate 30, and as shown in FIG. 4, a bottom surface portion 33a and a side surface portion 33b rising from one long side outer edge of the bottom surface portion 33a. A horizontal cross section L-shaped (inverted L-shaped in FIG. 4) is formed. The bottom surface portion 33 a of the heat radiating plate 33 is fixed to the bottom plate 22 a of the chassis 22. The LED substrate 30 is held inside the side surface portion 33 b of the heat radiating plate 33 with its bottom surface 30 a in contact with the bottom surface portion 33 a of the heat radiating plate 33. In the state where the LED substrate 30 is held by the heat radiating plate 33, the height of the LED substrate 30 is equal to the height of the side surface portion 33 b of the heat radiating plate 33. For this reason, in the state where the LED substrate 30 is held by the heat radiating plate 33, the entire surface of the plate surface 30 b facing the heat radiating plate 33 of the LED substrate 30 comes into contact with the side surface portion 33 b of the heat radiating plate 33.

The LED substrate 30 is provided with a convex portion 40 that protrudes toward the side surface portion 33 b of the heat radiating plate 33 on the plate surface 30 b facing the heat radiating plate 33. As shown in FIG. 5, the convex portion 40 is provided from one end to the other end along the long side direction (X-axis direction) of the LED substrate 30, and the height direction (Z-axis direction) of the LED substrate 30. It has a shape that extends from the center to the heat radiating plate 33 side and spreads in a flat plate shape so that groove-shaped dents are formed on the upper and lower sides thereof.

On the other hand, the side surface portion 33 b of the heat radiating plate 33 is provided with a concave portion 42 that opens to the side facing the convex portion 40. The concave portion 42 is provided in a shape corresponding to the convex portion 40 and can be fitted to the convex portion 40. For this reason, the opening 42a of the concave portion 42 facing the convex portion 40 has a width W1 smaller than the width W2 of the portion of the convex portion 40 that spreads in a flat plate shape, and is convex from the opening 42a side of the concave portion 42. It is set as the structure which cannot make the part 40 fit. Further, the recess 42 has an open portion 42b that is open to one outer edge (the front side in FIG. 4) in the long side direction (X-axis direction) of the side surface portion 33b of the heat radiating plate 33. And the convex part 40 becomes a structure which can be made to fit with the recessed part 42 by sliding to the X-axis direction from the open part 42b of the recessed part 42 in the state which match | combined the position on the YZ plane with respect to the recessed part 42. (See FIG. 6). In addition, in the plate | board surface of the side part 33b of the heat sink 33 in which the recessed part 42 was provided, the recessed part 42 is not open | released in the outer edge on the opposite side to the open part 42b, It is in the closed state.

In a state where the concave portion 42 and the convex portion 40 are fitted, the entire surface of the convex portion 42 provided on the LED substrate 30 comes into contact with the concave portion 40. For this reason, the surface area of the contact interface between the LED substrate 30 and the heat sink 33 when the concave portion 42 and the convex portion 40 are fitted is the plate between the LED substrate 30 and the side surface portion 33b of the heat sink 33 by screwing or the like. Compared to the case where the surfaces are brought into contact with each other, the surface area of the convex portion 42 is increased. Therefore, in the holding mode of the LED substrate 30 with respect to the heat radiating plate 33 according to the present embodiment, the efficiency of transferring heat transmitted from the LED substrate 30 to the heat radiating plate 33 is improved.

Further, in a state in which the concave portion 42 and the convex portion 40 are fitted, the LED substrate 30 may slide to the open portion 42b side of the concave portion 42, so the LED substrate 30 needs to be fixed to the heat radiating plate 33. There is. Therefore, in the present embodiment, as shown in FIG. 7, the end of the heat sink 33 on the side where the opening 42 b of the recess 42 is provided is screwed with the end of the LED substrate 30 and the screw 44. The LED substrate 30 is fixed to the heat sink 33. Thereby, it can prevent that the LED board 30 slides to the open part 42b side of the recessed part 42 in the state which fitted the recessed part 42 and the convex part 40. FIG.

As described above, in the backlight device 24 according to the present embodiment, the LED substrate 30 is mounted on the heat dissipation plate by fitting the convex portion 40 provided on the LED substrate 30 with the concave portion 42 provided on the heat dissipation plate 33. Therefore, the surface area of the contact interface between the LED substrate 30 and the heat radiating plate 33 can be increased as compared with the case where the LED substrate 30 is held on the heat radiating plate 33 by screwing or the like. Thereby, the heat generated from the LED light source 28 can be effectively transmitted from the LED substrate 30 to the heat radiating plate 33, and the heat dissipation of the heat generated from the LED light source 28 can be improved.

Further, in the backlight device 24 according to the present embodiment, the heat sink 33 can be attached to the LED substrate 30 without using screws. Or when fixing the edge part of the LED board 30 to the heat sink 33, it is sufficient to use only screws for fixing. For this reason, the screwing operation in the manufacturing process can be eliminated (or the screwing operation can be reduced), the production efficiency can be improved, and the number of parts can be reduced. Furthermore, since the LED board 30 can be attached to the heat sink without using screws, it is possible to eliminate rattling between the LED board 30 and the heat sink 33 due to screwing.

Further, in the backlight device 24 according to the present embodiment, the recess 42 is provided in a groove shape along the plate surface of the heat radiating plate 33, and has an open portion 42 a that is open to one outer edge of the plate surface, The convex portion 40 is provided linearly along the LED substrate 30 and can be fitted to the concave portion 42 by sliding from the opening 42 a of the concave portion 42. For this reason, the LED board 30 can be attached with respect to the heat sink 33 by sliding the LED board 30, and the attachment process of the LED board 30 at the time of manufacture can be made easy.

Further, in the backlight device 24 according to the present embodiment, the convex portion 40 has a part larger than the width of the opening 42b of the concave portion 42 in a part thereof. For this reason, the convex part 40 cannot be pushed into the concave part 42 from the opening and the concave part 42 and the convex part 40 can be fitted, and the concave part 42 and the convex part can only be projected by sliding the LED substrate 30 from the opening part 42a. The part 40 can be fitted. Thereby, it can prevent thru | or suppress that the convex part 40 remove | deviates from the opening 42a side of the recessed part 42, and can make it difficult to remove the LED board 30 from the heat sink 33. FIG.

Further, in the backlight device 24 according to the present embodiment, the LED substrate 30 is fixed to the heat radiating plate 33 by screwing one end of the plate surface in the sliding direction with the end of the heat radiating plate 33. ing. Thereby, by screwing one of the both ends in the sliding direction of the LED board 30, it is possible to prevent or suppress the movement in the sliding direction, and to make the LED board 30 difficult to come off from the heat dissipation plate 33. be able to.

Further, in the backlight device 24 according to the present embodiment, the open portion 42a is provided only on one outer edge of the plate surface on which the concave portion 42 is provided. For this reason, only the outer edge on the side where the open portion 42a is provided in the plate surface provided with the recess 42 may be screwed or taped, and the screwing or tape fastening operation can be facilitated.

Further, in the backlight device 24 according to the present embodiment, the LED substrate 30 provided with the convex portions 40 is compared with the thermal expansion coefficient of the heat radiating plate 33 provided with the concave portions 42 among the LED substrate 30 and the heat radiating plate 33. The coefficient of thermal expansion is assumed to be large. For this reason, the space | interval between the recessed part 42 and the convex part 40 can be narrowed because the convex part 40 thermally expands in the state in which the recessed part 42 and the convex part 40 were fitted, and the recessed part 42 and the convex part 40 are Adhesion can be increased. As a result, the heat dissipation of the heat generated from the LED light source 28 can be further improved.

In the backlight device 24 according to the present embodiment, the heat radiating plate 33 has a bottom surface portion 33a and a side surface portion 33b that rises from one outer edge of the bottom surface portion 33a, and has a substantially L shape in a cross-sectional view. ing. For this reason, the bottom surface portion 33a of the heat radiating plate 33 can be fixed to the chassis 22, and the LED substrate 30 can be attached to the side surface portion 33b of the heat radiating plate 33, so that a suitable shape of the heat radiating plate 33 can be realized.

In the backlight device 24 according to the present embodiment, the entire surface of the LED substrate 30 that faces the side surface portion 33b is in contact with the side surface portion 33b. For this reason, the surface area of the contact interface between the LED substrate 28 and the heat radiating plate 33 can be further increased, and the heat dissipation 33 of the heat generated from the LED light source 28 can be further improved.

In the backlight device 24 according to the present embodiment, the entire surface of the LED substrate 30 that faces the bottom surface portion 33a is in contact with the bottom surface portion 33a. Accordingly, in the LED substrate 30, not only the surface facing the side surface portion 33 b of the heat radiating plate 33 but also the surface facing the bottom surface portion 33 b of the heat radiating plate 33 comes into contact with the heat radiating 33 plate. The surface area of the contact interface between the LED and the heat radiating plate 33 can be further increased, and the heat dissipation of the heat generated from the LED light source 28 can be further improved.

<Embodiment 2>
A second embodiment will be described with reference to the drawings. FIG. 8 shows a cross-sectional view of the LED substrate 80 and the heat dissipation plate 83 according to the second embodiment. FIG. 9 shows an enlarged plan view of the end portions of the LED substrate 80 and the heat radiating plate 83. The second embodiment is different from the first embodiment in the configuration for fixing the concave and convex shapes and the end of the LED board to the end of the heat sink. Since the other configuration is the same as that of the first embodiment, the description of the structure, operation, and effect is omitted. 8 and 9, the part obtained by adding the numeral 50 to the reference numerals in FIGS. 4 and 7 is the same as the part described in the first embodiment.

In the backlight device according to the second embodiment, the convex portion 90 provided on the LED substrate 80 is provided from one end to the other end along the long side direction (X-axis direction) of the LED substrate 80. As shown in FIG. 8, the protrusion 90 has a flat plate shape so as to extend from the lower end in the height direction of the LED substrate 80 toward the heat radiating plate 83 and to form a groove-like dent on the upper side. It has a shape that spreads out. Since the convex portion 90 has such a shape, as in the case of the first embodiment, the LED substrate 80 is moved from the open portion of the concave portion 92 in a state where the positions of the convex portion 90 and the concave portion 92 on the YZ plane are aligned. The concave portion 92 and the convex portion 90 can be fitted only by sliding in the X-axis direction.

In the backlight device according to the second embodiment, as shown in FIG. 9, the end of the heat sink 83 on the side where the opening of the recess 92 is provided is taped with the end of the LED substrate 80 and the tape 96. As a result, the LED substrate 80 is fixed to the heat sink 83. Thereby, it can prevent that the LED board 80 slides to the open part side of the recessed part 92 in the state which made the recessed part 92 and the convex part 90 fit.

<Embodiment 3>
Embodiment 3 will be described with reference to the drawings. FIG. 10 shows a cross-sectional view of the LED substrate 130 and the heat radiating plate 133 according to the third embodiment. The third embodiment is different from the first embodiment in the shapes of the concave portion 142 and the convex portion 140. 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. 10, the part obtained by adding the numeral 100 to the reference sign in FIG. 4 is the same as the part described in the first embodiment.

In the backlight device according to Embodiment 3, the convex portion 140 provided on the LED substrate 130 is provided from one end to the other end along the long side direction (X-axis direction) of the LED substrate 130. As shown in FIG. 10, the convex portion 140 is a flat plate that extends from the upper end in the height direction of the LED substrate 130 toward the heat radiating plate 133 and has a groove-like dent formed below the convex portion 140. It has a shape that spreads out in a shape. On the other hand, the concave portion 142 provided in the side surface portion 133b of the heat radiating plate 133 has a shape corresponding to the convex portion 140 and a shape opened to the upper side of the heat radiating plate 133. For this reason, not only can the concave portion 142 and the convex portion 140 be fitted by sliding the LED substrate 130 in the X-axis direction, but also the LED with the convex portion 140 and the concave portion 142 aligned on the XY plane. By lowering the substrate 130 in the Z-axis direction from above the concave portion 142, the concave portion 142 and the convex portion 140 can be fitted.

<Embodiment 4>
Embodiment 4 will be described with reference to the drawings. FIG. 11 shows a cross-sectional view of the LED substrate 180 and the heat dissipation plate 183 according to the fourth embodiment. FIG. 12 is a cross-sectional view of the LED substrate 230 and the heat sink 233 according to the first modification of the fourth embodiment. FIG. 13 is a cross-sectional view of the LED substrate 280 and the heat dissipation plate 283 according to the second modification of the fourth embodiment. In the fourth embodiment, the shapes of the concave portions 192, 242, and 292 and the convex portions 190, 240, and 290 are different from those 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 FIGS. 11, 12, and 13, the parts obtained by adding numerals 150, 200, and 250 to the reference numerals in FIG. 4 are the same as the parts described in the first embodiment.

In the backlight device according to the fourth embodiment, the convex portion 190 is provided to protrude from the center in the height direction of the LED substrate 180 toward the side surface portion 183b of the heat sink 183, and the LED substrate 180 has a circular shape in a cross-sectional view. It has a shape extending in a cylindrical shape along the long side direction. And since the opening of the recessed part 192 is made smaller than the diameter of the convex part 190 which comprises a cross-sectional columnar column shape, the convex part 190 cannot be fitted from the opening side of the recessed part 192. For this reason, also in this case, the concave portion 192 and the convex portion 190 can be fitted only by sliding the LED substrate 180 from the opening portion of the concave portion 192.

Moreover, the convex part 240 can also be made into the shape as shown in FIG. 12 as the modification 1 of Embodiment 4. FIG. The convex portion 240 in the first modification is provided so as to protrude from the center in the height direction of the LED substrate 230 toward the side surface portion 233b of the heat sink 233, and has a trapezoidal shape in which the lower bottom side faces the concave portion 242 in a sectional view. The LED board 230 has a shape extending along the long side direction. And since the opening of the recessed part 242 is made smaller than the bottom bottom of the convex part 240 which comprises cross-sectional trapezoid shape, the convex part 240 cannot be fitted from the opening side of the recessed part 242. For this reason, also in this case, the concave portion 242 and the convex portion 240 can be fitted only by sliding the LED substrate 230 from the opening portion of the concave portion 242.

Moreover, the convex part 290 can also be made into the shape as shown in FIG. 13 as the modification 2 of Embodiment 4. FIG. The convex part 290 in the modified example 2 is provided so as to protrude from the center in the height direction of the LED substrate 280 toward the side surface part 283b of the heat sink 283 so that the corner part thereof has a rhombus shape facing the concave part 292 in a sectional view. The LED board 280 has a shape extending along the long side direction. And since the opening of the recessed part 242 is made into the thing smaller than the diagonal width | variety of the convex part 240 which comprises a cross-sectional rhombus shape, the convex part 290 cannot be fitted from the opening side of the recessed part 292. For this reason, also in this case, the concave portion 292 and the convex portion 290 can be fitted only by sliding the LED substrate 280 from the opening portion of the concave portion 292.

<Embodiment 5>
Embodiment 5 will be described with reference to the drawings. FIG. 14 is a cross-sectional view of the LED substrate 330 and the heat dissipation plate 333 according to the fifth embodiment. The fifth embodiment is different from the first embodiment in the shape of the member provided with the concave portion and the convex portion and the heat radiating plate. 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. 14, the part obtained by adding the numeral 300 to the reference sign in FIG. 4 is the same as the part described in the first embodiment.

In the backlight device according to the fifth embodiment, the convex portion 340 is provided on the heat radiating plate 333, and the concave portion 342 is provided on the LED substrate 330. The shape of the convex portion 340 and the shape of the concave portion 342 are the same as those of the first embodiment. Thus, even if the member provided with the concave portion 342 and the convex portion 340 is opposite to that of the first embodiment, the heat sink is in a state in which the positions of the convex portion 340 and the concave portion 342 are aligned on the YZ plane. In contrast, the concave portion 342 and the convex portion 340 can be fitted to each other by sliding the LED substrate 330 in the X-axis direction from the side thereof.

Further, in the backlight device according to the fifth embodiment, the bottom surface portion 333a of the heat radiating plate 333 has an L-shape in sectional view provided on the side opposite to the side on which the LED substrate 330 is fitted. For this reason, in a state where the concave portion 340 and the convex portion 340 are fitted, the LED substrate 330 is configured not to contact the bottom plate 333a of the heat radiating plate 333. Even in such a case, the heat sink 333 can be fixed to the chassis by attaching the bottom surface portion 333a of the heat sink 333 to the chassis.

<Embodiment 6>
Embodiment 6 will be described with reference to the drawings. FIG. 15 is a perspective view of the LED substrate 380 and the heat dissipation plate 383 according to the sixth embodiment. The sixth embodiment is different from the first embodiment in the shape of the concave portion 392 and the convex portion 390 and the fitting mode of the concave portion 392 and the convex portion 390. 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. 15, the part obtained by adding the numeral 350 to the reference numeral in FIG. 4 is the same as the part described in the first embodiment.

In the backlight device according to Embodiment 6, the plurality of convex portions 390 are provided along the short side direction (Z-axis direction) of the LED substrate 380, and the plurality of concave portions 392 correspond to the shape and arrangement of the convex portions 390. As described above, the heat sink plate 383 is provided along the height direction (Z-axis direction) of the side surface portion 383b. And the convex part 390 has comprised the shape extended in a Z-axis direction so that the lower bottom side may comprise the trapezoid shape which opposes the recessed part 242 in the cross sectional view of a Z-axis direction. In this case, the LED substrate 330 is slid downward from the upper side in the Z-axis direction with respect to the heat radiating plate in a state where the positions of the convex portion 390 and the concave portion 392 are aligned on the XY plane, so that the concave portion 392 and the convex portion 390 are moved. Can be fitted. Furthermore, since the LED substrate 380 is held with respect to the heat sink 383 by fitting the plurality of protrusions 390 and the plurality of recesses, the surface area of the contact interface between the LED substrate 380 and the heat sink 383 is increased. The heat dissipation 383 of the heat generated from the LED light source 380 can be further improved.

The correspondence between the configuration of each embodiment and the configuration of the present invention is described. LED light sources 28, 78, 128, 178, 228, 278, 328, 378 are examples of “light sources”. The chassis 22 is an example of the “accommodating member”. The backlight device 24 is an example of an “illumination device”.

The modifications of the above embodiments are listed below.
(1) In each of the above embodiments, the configuration in which the concave portion and the convex portion can be fitted by sliding the LED substrate with respect to the heat radiating plate is not limited to this. For example, the concave portion is provided in a hole shape or a through hole shape, the convex portion is provided in a columnar shape corresponding to the concave portion, and the concave portion and the convex portion are fitted by pushing the convex portion into the concave portion from the opening. A configuration may be adopted.

(2) In each of the above embodiments, the heat sink has a L-shaped configuration in cross-sectional view. However, the heat sink may have any shape that can hold the LED substrate, and the shape of the heat sink is limited. Not.

(3) In addition to the above embodiments, the arrangement, shape, and the like of the concave and convex portions can be changed as appropriate.

(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.

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: liquid crystal display device, 12: bezel, 14: frame, 16: liquid crystal panel, 18: optical member, 18a: diffusion sheet, 18b : Lens sheet, 18c: reflection type deflection plate, 20: light guide plate, 20a: light incident surface, 22: chassis, 22a: bottom plate, 24: backlight device, 26: reflection sheet, 28, 78, 128, 178, 228 278, 328, 378: LED light source, 30, 80, 130, 180, 230, 280, 330, 380: LED substrate, 32: LED unit, 33, 83, 133, 183, 233, 283, 333, 383: Heat sink, 40, 90, 140, 190, 240, 290, 340, 390: convex part, 42, 92, 142, 192, 242, 92,342,392: recess

Claims (14)

A light source substrate;
A light source disposed on the surface of the light source substrate;
A light incident surface provided on a side surface and guiding light from the light source;
Holding the light source substrate, a heat dissipation plate having a large heat dissipation efficiency compared to the light source substrate,
A housing member that houses at least the light source substrate, the light guide plate, and the heat radiating plate;
A convex portion that protrudes toward the other is provided on one plate surface of the light source substrate and the heat radiating plate, and a concave portion that can be fitted to the convex portion is provided on a plate surface that faces the other convex portion. Provided,
The lighting device, wherein the light source substrate is held by the heat radiating plate by fitting the concave portion and the convex portion. The concave portion is provided in a groove shape along the other plate surface, and has an open portion opened to at least one outer edge of the plate surface,
The said convex part is linearly provided along said one plate | board surface, and can be fitted with this recessed part by making it slide from the said open part of the said recessed part. Lighting equipment. The lighting device according to claim 2, wherein the convex part has a part larger than a width of the opening of the concave part in a part thereof. The said light source board is fixed to this heat sink by screwing at least one of the both ends in the said sliding direction of the plate surface with the edge part of the said heat sink. Item 4. The lighting device according to Item 3. The said light source board is fixed to this heat sink by tape-fixing at least one of the both ends in the said sliding direction of the plate surface with the edge part of the said heat sink. Item 4. The lighting device according to Item 3. The lighting device according to claim 4 or 5, wherein the opening portion is provided only on one outer edge of the plate surface provided with the concave portion. The thermal expansion coefficient of the one of the light source substrate and the heat radiating plate provided with the convex portion is larger than the thermal expansion coefficient of the other of the light source substrate and the heat radiating plate provided with the concave portion. Item 7. The lighting device according to any one of items 6 to 6. The said heat sink has a bottom face part and the side part which stands | starts up from one outer edge of this bottom face part, and comprises a substantially L shape in a cross sectional view. The lighting device according to item 1. The lighting device according to claim 8, wherein the light source substrate has an entire surface facing the side surface portion in contact with the side surface portion. 10. The lighting device according to claim 8, wherein the entire surface of the light source substrate facing the bottom surface is in contact with the bottom surface. The lighting device according to any one of claims 1 to 10, comprising a plurality of the concave portions and a plurality of the convex portions that can be fitted into the plurality of the concave portions, respectively. A display device comprising a display panel that performs display using light from the illumination device according to any one of claims 1 to 11. The display device according to claim 12, wherein the display panel is a liquid crystal panel using liquid crystal. A television receiver comprising the display device according to claim 12 or 13.

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