WO2013069598A1

WO2013069598A1 - Illumination device, display device, and television reception device

Info

Publication number: WO2013069598A1
Application number: PCT/JP2012/078593
Authority: WO
Inventors: 寺島　健太郎
Original assignee: シャープ株式会社
Priority date: 2011-11-07
Filing date: 2012-11-05
Publication date: 2013-05-16

Abstract

A backlight device (24) has: an LED light source (28); a light guide plate (20), one side of which is a light entry surface (20a), arranged so that the light entry surface (20a) faces the LED light source (28); and a light-transmitting member (36), arranged between the LED light source (28) and the light entry surface (20a), for restricting the distance between the light entry surface (20a) and the LED light source (28), the light-transmitting member being capable of transmitting light from the LED light source (28) to the light entry surface (20a). Since the light-transmitting member (36) can prevent the light guide plate (20) from rattling, the light entry surface (20a) of the light guide plate (20) and the light exit surface (28a) of the LED light source (28) can be prevented from coming into contact with each other. As a result, the light exit surface (28a) of the LED light source (28) can be prevented from being damaged or otherwise harmed by the light guide plate (20).

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 the edge light type backlight device, an uneven surface is provided on an end surface other than the light incident surface of the light guide plate housed in the chassis as a housing, and the uneven surface can be fitted to the uneven surface of the side plate of the chassis. A configuration with irregularities is known. Thus, the light guide plate can be positioned in the chassis by fitting the unevenness provided on the light guide plate side with the unevenness provided on the side plate of the chassis. In such a backlight device, a gap is generated between the concaves and convexes fitted to each other, so that there is a problem that the light guide plate is shaken in the plate surface direction due to vibration or the like.

Therefore, Patent Document 1 discloses a backlight device in which the light guide plate housed in the chassis is suppressed from shaking in the plate surface direction due to vibration or the like. In this backlight device, a rib is disposed between the light guide plate and the side plate of the chassis so as to have a spring property. For this reason, it can suppress that a light-guide plate shakes in the plate | board surface direction with the elastic force of a rib.

JP 2008-27736 A

(Problems to be solved by the invention)
However, in the backlight device of Patent Document 1 described above, since the light guide plate is prevented from rattling by the elastic force of the ribs, it is not possible to prevent the light guide plate from rattling slightly, and between the light guide plate and the LED. The distance cannot be fully regulated. For this reason, the light incident surface of the light guide plate may come into contact with the light exit surface of the LED due to vibration or the like, and the light exit surface of the LED may be damaged.

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 a technology capable of preventing a light-emitting surface of a light source from being damaged by a light guide plate.

(Means for solving the problem)
The technology disclosed in this specification includes a light source, a light guide plate in which at least one side surface is a light incident surface, and the light incident surface is disposed to face the light source, the light source, and the light incident surface. And a translucent member that regulates a distance between the light incident surface and the light source and transmits light from the light source to the light incident surface side. About.

According to the illuminating device described above, the light transmission member prevents light from being changed in the distance between the light guide plate and the light source while realizing a configuration in which light from the light source is guided to the light incident surface side by the light transmission member. Can do. For this reason, it can prevent that a light-guide plate rattles, and can prevent that the light-incidence surface of a light-guide plate and the light emission surface of a light source contact | abut. As a result, the light output surface of the light source can be prevented from being damaged by the light guide plate.

The light incident surface may have a rectangular shape, and the translucent member may have a cylindrical shape with the long side direction of the light incident surface as an axial direction.
According to this configuration, the translucent member comes in contact with the light incident surface of the light guide plate and the light exit surface of the light source at one point of the cross section of the light transmissible member, so the translucent member is displaced in the plate surface direction of the light guide plate. By doing so, it is possible to reduce damage to the light exit surface of the light source.

A light source substrate in which the light source is disposed on a plate surface opposite to the light incident surface, and a portion of the light source substrate on which the light source is disposed on the plate surface on which the light source is disposed; And a contact member that contacts the translucent member.
According to this configuration, by providing the contact member, it is possible to easily dispose the columnar light-transmitting member between the light source and the light guide plate.

The front end of the contact member on the light incident surface side may be positioned closer to the light incident surface than the light exit surface of the light source.
According to this configuration, the cylindrical light-transmitting member is less likely to be disturbed by the light source when abutting the abutting member against the abutting member, so that the abutting member can be easily abutted.

The part of the contact member that contacts the light transmitting member may be an inclined surface that is inclined with respect to the plate surface of the light source substrate.
According to this configuration, the cylindrical light-transmitting member can be easily brought into contact with the contact member.

The inclined surface may be inclined so as to form an angle of 45 ° with respect to the plate surface of the light source substrate.
According to this configuration, the cylindrical translucent member can be more easily brought into contact with the contact member.

The translucent member may be formed of a glass material.
According to this structure, the specific structure of the translucent member excellent in translucency and durability is realizable.

The contact member may be formed of a metal material.
According to this structure, the specific structure of the contact member excellent in light reflectivity and durability is realizable.

The contact member may be formed by cutting.
According to this configuration, the shape of the contact member can be easily designed.

The light guide plate further comprising: a bottom plate; and a side plate that rises from an edge of the bottom plate to one surface side of the bottom plate, and that accommodates at least the light guide plate, the light source, and the light transmissive member. A convex portion that partially protrudes toward the other side is provided on any one of the side surface other than the light incident surface and the side plate of the housing member, and the convex portion is provided on the other side. A concave portion that is opposed and partially recessed may be provided, and the convex portion and the concave portion may be fitted.
According to this configuration, when a gap is generated in the fitting portion between the convex portion and the concave portion while realizing a configuration in which the light guide plate is positioned in the housing member by fitting the convex portion and the concave portion. Even so, it is possible to prevent the light guide plate from rattling.

You may further provide the heat sink which has heat dissipation and the one part contact | abuts the other plate surface of the said light source board | substrate.
According to this configuration, heat generated in the light source substrate can be effectively radiated to the outside by the heat radiating plate, so that the heat dissipation of the lighting device can be 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. In this case, a frame member that accommodates the light source, the light source substrate, the display panel, and the light guide plate is further provided between the chassis and the chassis opposite to the display panel side with respect to the light guide plate. It may be arranged on the side. According to this configuration, a display device that does not include a cabinet can be realized.

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 this specification, it is possible to prevent the light output surface of the light source from being damaged by the light guide plate.

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. The top view of the backlight apparatus 24 is shown. A cross-sectional view of the liquid crystal display device 10 is shown. The principal part sectional view of liquid crystal display 10 is shown. FIG. 4 is a cross-sectional view of a main part of a liquid crystal display device 110 according to a second embodiment. FIG. 5 is a cross-sectional view of a main part of a liquid crystal display device 210 according to Embodiment 3.

<Embodiment 1>
Embodiment 1 will be described with reference to the drawings. FIG. 1 is an exploded perspective view of the television receiver TV according to the first embodiment. FIG. 2 is an exploded perspective view of the liquid crystal display unit LDU constituting the liquid crystal display device 10. FIG. 3 is a plan view of the backlight device 24. FIG. 4 is a cross-sectional view of the cross section along the short side direction of the liquid crystal display device 10. 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.

The television receiver TV includes a liquid crystal display unit LDU, various substrates PWB, MB, CTB attached to the back side (back side) of the liquid crystal display unit LDU, and main substrates PWB, MB, A cover member CV attached to cover the CTB and a stand ST are provided, and the display surface of the liquid crystal display unit LDU is held by the stand ST along the vertical direction (Y-axis direction). The liquid crystal display device 10 according to the present embodiment is obtained by removing at least a configuration for receiving a television signal (such as a tuner portion of the main board MB) from the television receiver TV having the above-described configuration. As shown in FIG. 2, the liquid crystal display unit LDU has a horizontally long rectangular shape (rectangular shape, longitudinal shape) as a whole, and includes a liquid crystal panel 16 that is a display panel and a backlight device 24 that is an external light source. These are configured to be integrally held by the frame 14 and the chassis 22 which are appearance members constituting the appearance of the liquid crystal display device 10. In addition, the chassis 22 according to the present embodiment constitutes a part of the appearance member and a part of the backlight device 24.

The various substrates PWB, MB, and CTB include a power supply substrate PWB, a main substrate MB, and a control substrate CTB. The power supply substrate PWB can be said to be a power supply source of the liquid crystal display device 10 and can supply driving power to the other substrates MB and CTB, the LED light source 28 of the backlight device 12, and the like. . Therefore, it can be said that the power supply substrate PWB also serves as the “LED drive substrate for driving the LED light source 28”. The main board MB has at least a tuner unit capable of receiving a television signal and an image processing unit (not shown) for processing the received television signal, and controls the processed image signal as follows. Output to the substrate CTB is possible. The main board MB receives an image signal from the image reproduction device when the liquid crystal display device 10 is connected to an external image reproduction device (not shown). It can be processed and output to the control board CTB. The control board CTB has a function of converting an image signal input from the main board into a liquid crystal driving signal and supplying the converted liquid crystal driving signal to the liquid crystal panel 16.

As shown in FIG. 2, the liquid crystal display unit LDU that constitutes the liquid crystal display device 10 has its main components between the frame 14 that forms the front side appearance and the chassis 22 that forms the back side appearance. It is assumed that it is housed in a space. The main components housed in the frame 14 and the chassis 22 include at least the liquid crystal panel 16, the optical member 18, the light guide plate 20, and the LED unit 32. Among these, the liquid crystal panel 16, the optical member 18, and the light guide plate 20 are held in a state of being sandwiched between the front frame 14 and the rear chassis 22 in a stacked state. The backlight device 24 includes the optical member 18, the light guide plate 20, the LED unit 32, and the chassis 22, and is configured by removing the liquid crystal panel 16 and the frame 14 from the liquid crystal display unit LDU. The LED unit 32 that constitutes the backlight device 24 is disposed in the frame 14 and the chassis 22 so as to face one side of the light guide plate 20 in the short side direction (Y-axis direction). The LED unit 32 is arranged on the LED substrate 30, an LED light source 28 that is a light source, an LED substrate 30 on which the LED light source 28 is mounted, a heat sink (heat spreader, light source attachment member) 34 to which the LED substrate 30 is attached.

Contact members

32a and 32b, and a translucent member 36 disposed between the LED substrate 30 and the light incident surface 20a of the light guide plate 20. The configurations of the

contact members

32a and 32b and the translucent member 36 will be described in detail later. Hereinafter, each component will be described.

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 is comprised from the

side plates

22d and 22d which stand up from the outer edge. The

side plates

22d and 22d on both short sides of the chassis 22 are respectively provided with recesses 22t that open to the side facing the light guide plate 20 (inside the chassis 22). A space facing the LED unit 32 and the one side plate 22 c in the chassis 22 is a housing space for the light guide plate 20.

As shown in FIG. 2, the liquid crystal panel 11 has a horizontally long rectangular shape (rectangular shape, longitudinal shape) in a plan view, and a pair of glass substrates having excellent translucency are separated by a predetermined gap. In addition, the liquid crystal is sealed between both substrates. One substrate (array 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 other substrate (CF substrate) is provided with a color filter or counter electrode in which colored portions such as R (red), G (green), and B (blue) are arranged in a predetermined arrangement, and an alignment film. ing. The liquid crystal panel 16 is placed in a stacked manner on the front side of the optical member 18 described below, and the back side surface (the outer surface of the polarizing plate on the back side) is in close contact with the optical member 18 with almost no gap. . This prevents dust and the like from entering between the liquid crystal panel 16 and the optical member 18. The display surface of the liquid crystal panel 16 includes a display area on the center side of the screen where an image can be displayed, and a non-display area having a frame shape (frame shape) surrounding the display area on the outer peripheral edge side of the screen. . The liquid crystal panel 16 is connected to a control board CTB via a driver part for driving liquid crystal or a flexible board, and an image is displayed in a display area on the display surface 11a based on a signal input from the control board CTB. It has become so. A polarizing plate is disposed on the outside of both substrates. Note that elastic members 15 having elasticity are respectively arranged on a part of the surface exposed to the liquid crystal panel 16 side of the frame 14 (see FIG. 4).

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 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 disposed in a state where the surface opposite to the surface on which the LED light source 28 is disposed is in contact with the heat radiating plate 34. 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 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 FIGS. 2 and 3, the light guide plate 20 faces the light emitting surface 20b, which is the main plate surface, toward the diffusion sheet 18a so that one side faces the LED units 32, 32, and is opposite to the light emitting surface 20b. The opposite plate surface 20c, which is the plate surface on the side, is arranged so as to face the reflection sheet 26 side. The light incident surface 20a has a rectangular shape in which the horizontal direction (X-axis direction) is the long side direction and the thickness direction (Z-axis direction) of the light guide plate 20 is the short side direction (see FIG. 2). . 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. 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.

On the two side surfaces of the light guide plate 20 in the short side direction, as shown in FIG. 3, convex portions 20 s that partially protrude corresponding to the concave portions 22 t provided on the side plate 22 d in the short side direction of the chassis 22 are respectively provided. Is provided. The convex portion 20s is formed in a size that can be fitted into a concave portion 22t provided in the side plate 22d of the chassis 22. The light guide plate 20 is positioned with respect to the chassis 22 by fitting the concave portions 22t and the convex portions 20s.

The reflection sheet 26 has a rectangular shape, is made of synthetic resin, has a white surface 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 20 c on the opposite side of the light output surface 20 a of the light guide plate 20. The reflection sheet 26 can reflect light leaking from the LED unit 32 or the light guide plate 20.

The heat dissipating member 34 is a plate-like member having an L shape in cross section and having a heat dissipating property higher than that of the LED substrate 30. The heat dissipating member 34 is arranged along the long side direction of the chassis 22. (See FIG. 5). The bottom surface portion 34 a has a rectangular shape in plan view (see FIG. 2), extends from the side plate side 22 b of the chassis 22 to the end portion side of the light guide plate 20, and extends along the bottom plate 22 a of the chassis 22. It is arranged in contact with 22a. One end of the bottom surface portion 34 a is in contact with the side plate 22 b of the chassis 22. The standing wall portion 34b has a plate shape from the edge of the bottom surface portion 34a on the side contacting the side plate 22b of the chassis 22 and rises perpendicularly to the bottom plate 22a of the chassis 22, and one surface (outer surface) is While contacting the side plate 22b of the chassis 22 and a part of the frame 14, the other surface (inner surface) is in contact with the plate surface of the LED substrate 30 opposite to the side where the LED light source 28 is disposed.

Subsequently, the configuration of the

contact members

32a and 32b and the configuration of the translucent member 36, which are the main parts of the present embodiment, will be described. Here, FIG. 5 is a cross-sectional view of a main part of the liquid crystal display device 10 and shows an enlarged cross-sectional view of the vicinity of the light transmitting member 36 in FIG. As shown in FIG. 5, on the surface of the LED substrate 30 (the surface facing the light incident surface 20a of the light guide plate 20) where the LED light source 28 is not disposed, it is formed of a metal material such as aluminum. A pair of abutting

members

32a and 32b are arranged. The pair of abutting

members

32a and 32b are respectively disposed along the long side direction of the LED substrate 30 in the upper and lower portions of the LED substrate 30 in the cross-sectional view of FIG. An inclined surface is provided on a part of the surface. These inclined surfaces are formed by cutting and are inclined so as to face the inside of the tips of the

contact members

32a and 32b (center side in the thickness direction (Z-axis direction) of the light guide plate 20), and the plate of the LED substrate 30. The angles A and B made with respect to the surface are each set to 45 °. Further, the front end surface of the LED substrate 30 is located closer to the light incident surface 20 a side of the light guide plate 20 than the light exit surface 28 a of the LED light source 28.

Between the LED light source 28 and the light incident surface 20a of the light guide plate 20, it is made of a glass material, and transmits light from the LED light source 38 to the light incident surface 20a side as shown in FIGS. A translucent member 36 capable of performing the above is disposed. The translucent member 36 has a cylindrical shape whose axial direction is the long side direction of the light incident surface 20a (see FIG. 2), and the side surfaces thereof are the light exit surface 28a of the LED light source 28 and the light incident surface 20a of the light guide plate 20. And abutting surfaces of the abutting

members

32a and 32b, respectively (the respective abutting locations are indicated by reference numerals 28a1, 20a1, 32a1 and 32b1 in FIG. 5). As shown in FIG. 5, the translucent member 36 is in point contact with each member in a cross-sectional view. Moreover, the translucent member 36 is in contact with each member so as to be pressed from the light incident surface 20a side toward the LED light source 28 side. For this reason, the light-transmitting member 36 is held between the light guide plate 20 and the LED light source 28 without bonding or the like between the members, and the light-emitting surface of the LED light source 28 is transmitted by the light-transmitting member 36. The distance between 28a and the light incident surface 20a of the light guide plate 20 is restricted. With such a translucent member 36, the light emitted from the LED light source 28 is transmitted through the translucent member 36 and reaches the light incident surface 20 a of the light guide plate 20. .

As described above, in the backlight device 24 according to the present embodiment, the light transmitting member 36 and the light guide plate 20 are realized while realizing the configuration in which the light from the LED light source 28 is guided to the light incident surface 20a side by the light transmitting member 36. It is possible to prevent the distance from the LED light source 28 from changing. For this reason, it can prevent that the light-guide plate 20 rattles, and can prevent that the light-incidence surface 20a of the light-guide plate 20 and the light emission surface 28a of the LED light source 28 contact | abut. As a result, it is possible to prevent the light output surface 28 a of the LED light source 28 from being damaged by the light guide plate 20.

Further, in the backlight device 24 according to the present embodiment, the light incident surface 20a of the light guide plate 20 has a rectangular shape. The translucent member 36 has a cylindrical shape with the long side direction (X-axis direction) of the light incident surface 20a of the light guide plate 20 as the axial direction. Thus, the light transmitting member 36 comes into contact with the light incident surface 20a of the light guide plate 20 and the light output surface 28a of the LED light source 28 at one point of the cross section of the light transmitting member 36. It is possible to reduce damage to the light exit surface 28a of the LED light source 28 by being displaced in the plate surface direction.

Further, the backlight device 24 according to the present embodiment includes an LED substrate 30 having a light source disposed on a plate surface facing the light incident surface, and an LED light source 28 on the plate surface on which the LED light source 28 of the LED substrate 30 is disposed. Further provided are

contact members

32 a and 32 b which are disposed in the portions not disposed, protrude toward the light incident surface 20 a, and contact the light transmitting member 36. In the backlight device 24, the

contact members

32 a and 32 b are provided as described above, so that the columnar light transmitting member 36 can be easily disposed between the LED light source 28 and the light guide plate 20.

Further, in the backlight device 24 according to the present embodiment, the tips of the

contact members

32 a and 32 b on the light incident surface 20 a side of the light guide plate 20 are positioned closer to the light incident surface 20 a than the light exit surface 28 a of the LED light source 28. Yes. For this reason, when the column-shaped translucent member 36 is brought into contact with the

contact members

32a and 32b, the LED light source 28 is unlikely to be disturbed, so that it is easy to come into contact with the

contact members

32a and 32b.

Further, in the backlight device 24 according to the present embodiment, the inclined surfaces are inclined so that the portions of the

contact members

32 a and 32 b that are in contact with the light transmitting member 36 form an angle of 45 ° with respect to the plate surface of the LED substrate 30. It is said that. For this reason, it becomes the structure which is easy to make the cylindrical translucent member 36 contact | abut to contact

member

32a, 32b.

In addition, the backlight device 24 according to the present embodiment further includes a heat radiating plate 34 that has heat radiating properties, and a part of which is in contact with the other plate surface of the LED substrate 30. Thereby, since the heat generated in the LED substrate 30 can be effectively radiated to the outside by the heat radiating plate 34, the heat radiation property of the backlight device 24 can be enhanced.

<Embodiment 2>
A second embodiment will be described with reference to the drawings. FIG. 6 is a cross-sectional view of a main part of the liquid crystal display device 110 according to the second embodiment. In the second embodiment, the shape of the translucent member 136 is different from that of the first embodiment. Since the other configuration is the same as that of the first embodiment, the description of the structure, operation, and effect is omitted. In FIG. 6, the part obtained by adding the numeral 100 to the reference numeral in FIG. 5 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. 6, the translucent member 136 has an octagonal shape in sectional view, and has a prismatic shape with the long side direction of the light incident surface 120 a as the axial direction. As shown in FIG. 6, the translucent member 136 is in surface contact with each member in a sectional view. Even if the translucent member 136 has such a shape, the translucent member 36 can prevent the distance between the light guide plate 120 and the LED light source 128 from changing, so the light guide plate The light guide plate 120 can prevent the light output surface 128a of the LED light source 128 from being damaged or the like.

<Embodiment 3>
Embodiment 3 will be described with reference to the drawings. FIG. 7 is a cross-sectional view of a main part of the liquid crystal display device 210 according to the third embodiment. In the third embodiment, the shape of the

contact members

232a and 232b is different from that of the first embodiment. Since the other configuration is the same as that of the first embodiment, the description of the structure, operation, and effect is omitted. In FIG. 7, a part obtained by adding the numeral 200 to the reference numeral in FIG. 5 is the same as the part described in the first embodiment.

In the liquid crystal display device 210 according to the third embodiment, as shown in FIG. 7, the inclined surfaces provided on the front end surfaces of the

contact members

232a and 232b are curved surfaces. The curved surface follows the shape of the side surface of the light transmitting member 236 having a cylindrical shape. For this reason, as shown in FIG. 7, the translucent member 236 is in surface contact with the

contact members

232a and 232b in a sectional view. Even if the inclined surfaces of the

contact members

232a and 232b have such a shape, the light transmitting member 36 can prevent the distance between the light guide plate 120 and the LED light source 228 from changing. Therefore, the light guide plate 120 can be prevented from rattling, and the light output surface 228a of the LED light source 228 can be prevented from being damaged by the light guide plate 220.

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

LED light sources

28, 128, 228, and 328 are examples of “light sources”. The

backlight devices

24, 124, 224, and 324 are examples of “illumination devices”. The LED substrates 30, 130, and 230 are examples of “light source substrates”. The liquid

crystal display devices

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

The modifications of the above embodiments are listed below.
(1) In each of the above-described embodiments, the frame is exposed to the outside and the configuration without the bezel member is exemplified. However, the configuration with the bezel member may be used.

(2) In each of the above embodiments, the configuration in which only one side surface of the light guide plate is used as the light incident surface is exemplified. However, a configuration in which a plurality of side surfaces are used as the light incident surface may be used.

(3) In each of the above-described embodiments, the configuration in which the light-transmitting material is formed of a glass material is exemplified, but the light-transmitting material may be formed of another material. For example, a resin material such as acrylic may be used.

(4) In each of the above-described embodiments, the configuration in which the contact member is formed of a metal material such as aluminum is exemplified. However, the contact member may be formed of another material such as ceramic. A metal material having high thermal conductivity is preferable.

(5) In each of the above embodiments, the configuration in which the inclined surface of the contact member is formed by cutting is exemplified, but it may be processed by other methods. For example, die casting such as aluminum may be used.

(6) In each of the above embodiments, the configuration in which the backlight device includes the heat radiating plate and the LED light source is arranged on the surface of the heat radiating plate is exemplified, but the configuration may be provided that does not include the heat radiating plate. In this case, the LED board may be directly attached to the side plate of the chassis.

(7) In each of the above embodiments, the configuration in which the contact member is disposed on the surface of the LED substrate is illustrated, but a configuration in which the contact member is not provided may be employed. In this case, in the manufacturing process of the backlight device, a part that can be used as the contact member may be formed by processing a part of the surface of the LED substrate.

(8) Besides the above embodiments. About the shape of a translucent member, a magnitude | size, etc., it can change suitably.

(9) In addition to the above embodiments, the shape, arrangement, and the like of the contact member can be appropriately changed.

(10) 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 illustrated. However, the present invention can also be applied to display devices using other types of display panels.

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, LDU: liquid crystal display unit, PWB: power supply substrate, MB: main substrate, CTB: control substrate, CV: cover member, ST: stand, 10, 110, 210: liquid crystal display device, 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, 322:

Chassis

24, 124, 224: Backlight device, 26, 126, 226: Reflective sheet, 28, 128, 228: LED light source, 30, 130, 230: LED substrate, 32a, 32b, 132a, 1323b, 232a, 232b: Abutting members, 34, 134, 234: heat sinks, 36, 136, 236: translucent members

Claims

A light source;
A light guide plate in which at least one side surface is a light incident surface, and the light incident surface is disposed to face the light source;
The light source is disposed between the light source and the light incident surface, and regulates a distance between the light incident surface and the light source, and transmits light from the light source to the light incident surface side. An optical member;
A lighting device comprising:
The light incident surface has a rectangular shape,
The lighting device according to claim 1, wherein the translucent member has a cylindrical shape having an axial direction in a long side direction of the light incident surface.
A light source substrate in which the light source is disposed on a plate surface facing the light incident surface;
A contact member that is disposed on a portion of the light source substrate on which the light source is disposed and is not disposed on the light source, protrudes toward the light incident surface, and contacts the translucent member;
The lighting device according to claim 2, further comprising:
The lighting device according to claim 3, wherein a tip of the contact member on the light incident surface side is located closer to the light incident surface than a light exit surface of the light source.
5. The illumination device according to claim 3, wherein a portion of the contact member that contacts the translucent member is an inclined surface that is inclined with respect to a plate surface of the light source substrate.
The illuminating device according to claim 4, wherein the inclined surface is inclined so as to form an angle of 45 ° with respect to a plate surface of the light source substrate.
The lighting device according to any one of claims 1 to 6, wherein the translucent member is made of a glass material.
The lighting device according to any one of claims 1 to 7, wherein the contact member is formed of a metal material.
The lighting device according to any one of claims 1 to 8, wherein the contact member is formed by cutting.
A bottom plate and a side plate that rises from an edge of the bottom plate to one surface side of the bottom plate, and further includes a housing member that houses at least the light guide plate, the light source, and the translucent member,
A convex portion that partially protrudes toward the other side is provided on any one of the side surface other than the light incident surface of the light guide plate and the side plate of the housing member, and on the other side, 10. The recess according to claim 1, wherein a recess that is partially recessed is provided facing the protrusion, and the protrusion and the recess are fitted to each other. 11. Lighting device.
The lighting device according to any one of claims 1 to 10, further comprising a heat dissipation plate that has heat dissipation properties, a part of which is in contact with the other plate surface of the light source substrate.
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.
A chassis having the bottom plate and a side plate rising from an edge thereof;
A frame that houses the light source, the light source substrate, the display panel, and the light guide plate between the chassis and the chassis;
The display device according to claim 12, wherein the bottom plate of the chassis is disposed on a side opposite to the display panel with respect to the light guide plate.
The display device according to claim 12 or 13, wherein the display panel is a liquid crystal panel using liquid crystal.
A television receiver comprising the display device according to any one of claims 12 to 14.