WO2013002171A1

WO2013002171A1 - Illuminating device, display device and television receiver

Info

Publication number: WO2013002171A1
Application number: PCT/JP2012/066134
Authority: WO
Inventors: 和也近藤
Original assignee: シャープ株式会社
Priority date: 2011-06-28
Filing date: 2012-06-25
Publication date: 2013-01-03

Abstract

Provided is an illuminating device, wherein a light source substrate having a light source mounted thereon is directly attached to an end portion of a light guide plate without generating luminance unevenness. An illuminating device (10) of the present invention is configured of: a light source (4); a light source substrate (5) having the light source (4) mounted thereon; and a light guide plate (19) configured of a board-like member. The light guide plate (19) is provided with a cut insertion section (90), which has a shape formed by cutting a part of an end portion (191) of the board-like member, and into which the light source substrate (5) is to be inserted, and the light guide plate has the light source substrate (5) inserted into the cut insertion section (90) such that light emitted from the light source (4) is inputted to the inner side of the board-like member.

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, liquid crystal panels have been widely used as display units for televisions, mobile phones, portable information terminals and the like. Since the liquid crystal panel cannot emit light by itself, the light of an illumination device (so-called backlight device) is used to display an image. This illuminating device is arranged on the back side of the liquid crystal panel, and is configured to irradiate light spreading in a plane toward the back side of the liquid crystal panel.

As the illuminating device, one having a light guide plate and an LED (Light Emitting Diode) light source arranged so as to face the end face of the light guide plate is known. A plurality of LED light sources are mounted in a state of being arranged on a strip-like (longitudinal) light source substrate. The light source substrate is arranged along the end surface of the light guide plate such that each LED light source faces the end surface of the light guide plate at a predetermined interval.

This type of lighting device is generally known as a side light type (or edge light type), and the end surface of the light guide plate is a light incident surface on which light emitted from an LED light source is incident. The plate surface on the front side of the light guide plate is a light emitting surface that emits light toward the liquid crystal panel.

By the way, the light guide plate may expand and contract under the influence of temperature and humidity. When the light guide plate extends and moves so that the light incident surface approaches the LED light source, the proportion of light incident on the light incident surface increases, and the luminance of the illumination device increases and the light incident There exists a possibility that a surface and the said LED light source may contact, and the said LED light source may be damaged. In addition, when the light guide plate contracts and the light incident surface moves away from the LED light source, a ratio of light incident on the light incident surface is reduced among light emitted from the LED light source. As a result, the luminance of the lighting device is lowered.

Therefore, as shown in Patent Document 1 and the like, an LED substrate on which an LED light source is mounted is directly fixed to an end portion of a light guide plate using screws. The screw is inserted from the end face of the light guide plate toward the inside of the light guide plate.

JP 2010-177017 A

(Problems to be solved by the invention)
As shown in Patent Document 1, when the LED substrate is directly fixed to the end portion of the light guide plate using screws, the shadow of the screws enters the light emitting surface, which is a problem. . The shadow of the screw becomes a dark part, which causes luminance unevenness in the light emitted from the light emitting surface.

An object of the present invention includes an illumination device in which a light source substrate on which a light source is mounted is directly attached to an end portion of a light guide plate, a display device including the illumination device, and the display device without causing uneven luminance. TV receiver is provided.

(Means for solving the problem)
The illumination device according to the present invention is a light guide plate composed of a light source, a light source substrate on which the light source is mounted, and a plate-like member, and a shape in which a part is cut out at an end portion of the plate-like member Comprising a notch insertion portion into which the light source substrate is inserted, and a light guide plate into which the light source substrate is inserted so that light from the light source enters the inside of the plate-like member in the notch insertion portion, Is provided. Since the lighting device is provided with a notch insertion portion at an end portion of the light guide plate, the light source substrate on which the light source is mounted can be attached to the end portion of the light guide plate using the notch insertion portion.

In the lighting device, the notch insertion portion may have a shape penetrating so as to cross the end portion of the plate-like member.

In the illumination device, the light source substrate may be a long substrate, and the light source substrate may be inserted into the notch insertion portion so that the longitudinal direction thereof is along the penetrating direction.

In the illumination device, the notch insertion portion may include a pair of clamping portions that sandwich both end portions of the light source substrate in the short direction. Since the light source substrate is sandwiched by the sandwiching portion from the short side direction of the light source substrate, the distance between the light source and the inside of the light guide plate may change even if the light source substrate and the light guide plate are thermally expanded. It is suppressed.

In the illuminating device, the sandwiching portion may include a recess that fits with an end portion of the light source substrate in a short direction. The light source substrate can be sandwiched from the thickness direction of the light source substrate by providing the sandwiching portion with the recess.

In the illuminating device, the notch insertion portion has an upper jaw portion and a lower jaw portion that allow the holding portions to elastically expand each other when the light source substrate is inserted into the notch insertion portion. May be. When the notch insertion portion includes the upper jaw portion and the lower jaw portion, the light source substrate can be easily inserted into the notch insertion portion.

In the illumination device, the notch insertion portion may have a shape in which the end portion of the plate-like member is recessed from one plate surface of the plate-like member toward the other plate surface.

In the illumination device, the light source substrate may be a long substrate, and the light source substrate may be inserted into the notch insertion portion so that the short side direction is along the depression direction.

In the illumination device, the notch insertion portion may include a pair of sandwiching portions that sandwich the light source substrate from the thickness direction of the light source substrate. Since the light source substrate is sandwiched by the sandwiching portion from the thickness direction of the light source substrate, even if the light source substrate and the light guide plate are thermally expanded, the distance between the light source and the inside of the light guide plate is changed. Is suppressed.

In the illuminating device, the notch insertion portion may have a gap between the light source substrate and an end portion in the longitudinal direction. When the gap is provided, even if the light source substrate and the light guide plate are thermally expanded, the light source substrate is prevented from colliding with the light guide plate and causing interference.

The display device according to the present invention includes the illumination device and a display panel that performs display using light from the illumination device.

In the display device, the display panel may be a liquid crystal panel in which liquid crystal is sealed between a pair of substrates.

A television receiver according to the present invention includes the display device.

(The invention's effect)
According to the present invention, a light source substrate on which a light source is mounted without causing luminance unevenness, a lighting device directly attached to an end of a light guide plate, a display device including the lighting device, and the display device are provided. TV receiver can be provided.

1 is an exploded perspective view showing a schematic configuration of a television receiver according to Embodiment 1 of the present invention. Exploded perspective view showing schematic configuration of liquid crystal display device AA 'sectional view of the liquid crystal display device shown in FIG. Enlarged side view of the notch insertion portion provided at the end of the light guide plate The perspective view which represented typically the process of inserting a light source module in the notch insertion part provided in the edge part of a light-guide plate. The perspective view which represented typically the light-guide plate of the state in which the light source module was inserted in the notch insertion part Sectional drawing of the liquid crystal display device which concerns on Embodiment 2. FIG. The top view which represented typically the light-guide plate utilized with the illuminating device of Embodiment 3. FIG. Side view of the light guide plate shown in FIG. The perspective view which represented typically the process of inserting a light source module in the notch insertion part provided in the edge part of a light-guide plate. The top view which represented typically the light-guide plate of the state in which the light source module was inserted in the notch insertion part The top view which represented typically the state by which the light source module was inserted in the notch insertion part of the light-guide plate with which the illuminating device of Embodiment 4 is equipped.

<Embodiment 1>
Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 6. In the present embodiment, the lighting device 12, the liquid crystal display device 10 including the lighting device 12, and the television receiver TV including the liquid crystal display device 10 are illustrated. In each figure, an X axis, a Y axis, and a Z axis are shown. The upper side shown in FIGS. 2 and 3 is the front side, and the lower side is the back side.

FIG. 1 is an exploded perspective view showing a schematic configuration of the television receiver TV according to the first embodiment. As shown in FIG. 1, the television receiver TV of the present embodiment mainly includes a liquid crystal display device (display device) 10, front and back cabinets Ca and Cb that are stored so as to sandwich the liquid crystal display device 10, and a power source P. And a tuner T and a stand S. The liquid crystal display device 10 is supported by the stand S so that its display surface is along the vertical direction (Y-axis direction).

FIG. 2 is an exploded perspective view showing a schematic configuration of the liquid crystal display device 10. As shown in FIG. 2, the liquid crystal display device 10 has a horizontally long rectangular shape when viewed from the front side, and includes a liquid crystal panel (display panel) 11 and a back surface 11 b side of the liquid crystal panel 11. And a frame-shaped bezel 13 that covers the front side (display surface 11a side) of the liquid crystal panel 11. These are integrally held by attaching the bezel 13 or the like to the lighting device 12. The bezel 13 is made of a metal material or the like.

As shown in FIG. 2, the liquid crystal panel 11 has a horizontally long rectangular shape when viewed from the front side. The liquid crystal panel 11 mainly includes a pair of transparent glass substrates facing each other and a liquid crystal layer sealed between these substrates. Among these substrates, one glass substrate disposed on the back surface 11b side (back side) is a so-called thin film transistor (hereinafter, TFT) array substrate, and the other glass substrate disposed on the display surface 11a side (front side). Is a so-called color filter (hereinafter referred to as CF) substrate.

The TFT array substrate is mainly composed of a plurality of TFTs as switching elements and a plurality of transparent pixel electrodes connected to the drain electrodes of each TFT in a matrix (matrix) on a transparent glass plate. It consists of what is provided. Individual TFTs and pixel electrodes are provided for each pixel, and are partitioned by a plurality of gate wirings and a plurality of source wirings provided on the glass plate so as to cross each other. . Note that the gate electrode in each TFT is connected to the gate wiring, and the source electrodes thereof are connected to the source wiring.

The CF substrate is mainly formed on a transparent glass plate so that the CF composed of each color such as red (R), green (G), and blue (B) corresponds to each pixel of the TFT array substrate. It consists of what was provided in matrix form. Each CF is partitioned by a light-shielding black matrix (BM) provided in a lattice pattern on the glass plate. A transparent counter electrode or the like facing the pixel electrode of the TFT array substrate is provided on the CF and the BM.

The liquid crystal panel 11 is configured to supply image data and various control signals necessary for displaying an image from the drive circuit substrate to the above-described source wiring, gate wiring, counter electrode, and the like. Drives in a matrix system. The liquid crystal panel 11 is provided with polarizing plates on the display surface 11a side and the back surface 11b side so as to sandwich the pair of glass substrates.

The illuminating device 12 is a so-called edge light type (side light type), and mainly includes the light source module 3, a chassis (accommodating member) 14, an optical sheet 15, a light guide plate 19, a reflection sheet 20, and a frame 21. And.

The chassis 14 is formed of a shallow box having an upper opening, and is formed by pressing a plate material made of a metal material such as an aluminum material. The chassis 14 has a bottom plate 14a that is horizontally long when viewed from the front side, a pair of

walls

14c and 14d that are erected on the edge of the bottom side of the bottom plate 14a, and the bottom plate 14a. And a pair of

walls

14e and 14f provided upright at the edge of the long side.

The reflective sheet 20 has a horizontally long rectangular shape when viewed from the front side, and is made of a white foamed plastic sheet (for example, a foamed polyethylene terephthalate sheet). The reflection sheet 20 is accommodated in the box-shaped chassis 14 so as to cover the surface of the bottom plate 14a.

The light source module 3 mainly includes a plurality of LED light sources (light sources) 4 and an LED substrate (light source substrate) 5 on which these LED light sources 4 are mounted.

The LED light source (light source) 4 is composed of a plurality of LED chips, which are light emitting elements, sealed in a housing with a resin material or the like (so-called LED package), and is configured to emit white light. For example, the LED light source 4 includes three types of LED chips having different main emission wavelengths. Specifically, each LED chip has red (R), green (G), and blue (B). It is configured to emit monochromatic light. In addition, as the LED light source 4, it is not restricted to such a structure, Another structure may be sufficient. Other configurations of the LED light source 4 include, for example, a built-in LED chip that emits blue (B) in a single color, a phosphor having an emission peak in the red (R) region, and an emission peak in the green (G) region. The LED chip may be covered with a resin (for example, a silicon-based resin) mixed with a phosphor having the above. Further, as another configuration, a resin (for example, a silicon-based resin) in which an LED chip that emits blue (B) in a single color is incorporated and a phosphor that emits yellow light such as YAG (yttrium, aluminum, garnet) phosphor is mixed. ), The LED chip may be covered.

2 and 3, the LED substrate 5 has a long shape (band shape) extending in the long side direction (X-axis direction) of the chassis 14. The LED light source 4 described above is surface-mounted on the front surface 5 a of the LED substrate 5. A plurality of LED light sources 4 are mounted on the plate surface 5 a and are arranged on the plate surface 5 a so as to be aligned in a line along the longitudinal direction of the LED substrate 5. As will be described later, the LED substrate 5 is accommodated in the end portion of the light guide plate 19. The LED light sources 4 are electrically connected (series connected) to each other by a wiring pattern to be described later.

The LED substrate 5 is formed on a long (longitudinal) base material made of a metal material such as an aluminum-based material, an insulating layer made of a synthetic resin formed on the base material, and the insulating layer. A wiring pattern made of a metal film such as copper foil and a reflective layer made of a white insulating film formed on the insulating layer so as to cover the wiring pattern are provided. For convenience of explanation, in FIG. 3 and the like, the base material, the insulating layer, the wiring pattern, and the reflective layer in the LED substrate 5 are shown integrally.

As shown in FIGS. 2 and 3, the light guide plate 19 is a horizontally long rectangular shape in a plan view and is made of a plate-like member having a predetermined thickness, like the liquid crystal panel 11 and the chassis 14. The light guide plate 19 is manufactured from a synthetic resin material having a refractive index higher than air and substantially transparent (for example, an acrylic resin such as PMMA or polycarbonate). The light guide plate 19 includes a front-side plate surface 19a, a back-side plate surface 19b, two

end surfaces

19c and 19d on the short side, and two

end surfaces

19e and 19f on the long side. A notch insertion portion 90 into which the LED substrate 5 (light source module 3) on which the LED light source 4 is mounted is provided at the end portion 191 on the one end surface 19e side on the long side.

FIG. 4 is an enlarged side view of the notch insertion portion 90 provided at the end portion 191 of the light guide plate 19. The cutout insertion portion 90 has a shape that penetrates the end portion 191 along the long side direction (X-axis direction) of the light guide plate 19. The notch insertion portion 90 includes a first insertion chamber 91 into which the LED substrate 5 is inserted, and a second insertion chamber 92 into which the LED light source 4 is inserted. The first insertion chamber 91 includes a hole penetrating the end portion 191 of the light guide plate 19 along the longitudinal direction, and the cross-sectional shape thereof is a rectangular shape extending in the thickness direction of the light guide plate 19. . Further, the second insertion chamber 92 is smaller than the first insertion chamber 91, but, like the first insertion chamber 91, includes a hole penetrating the end portion 191 of the light guide plate 19 along the longitudinal direction. Similarly to the first insertion chamber 91, the cross-sectional shape of the second insertion chamber 92 has a rectangular shape that is elongated along the thickness direction of the light guide plate 19. The second insertion chamber 92 is disposed inside the light guide plate 19 relative to the first insertion chamber 91.

A notch groove 98 for separating the end surface 19e of the light guide plate 19 into an upper side and a lower side is formed outside the notch insertion portion 90. The notch groove 98 is formed along the longitudinal direction of the light guide plate 19. By the cutout groove 98, a portion surrounding the first insertion chamber 91 and the second insertion chamber 92 of the cutout insertion portion 90 is divided into an upper portion and a lower portion. A portion covering the first insertion chamber 91 and the second insertion chamber 92 from the upper side is an upper jaw portion 96, and a portion covering the first insertion chamber 91 and the second insertion chamber 92 from the lower side is a lower jaw portion 97. That is, the upper jaw portion 96 and the lower jaw portion 97 are both configured as a part of the light guide plate 19. The first insertion chamber 91 and the second insertion chamber 92 of the notch insertion portion 90 are sandwiched between an upper jaw portion 96 and a lower jaw portion 97. The upper jaw portion 96 and the lower jaw portion 97 are slightly elastically deformed so as to expand each other when the LED substrate 5 is inserted into the first insertion chamber 91. In addition, when the LED substrate 5 is not inserted, as shown in FIG.

Inside the upper jaw portion 96, a clamping portion 94 that covers the first insertion chamber 91 from above is provided. The sandwiching portion 94 has a concave shape on the upper side so that it can be fitted to one end portion 51 in the short direction of the LED substrate 5. The most depressed portion 94 a of the sandwiching portion 94 is flat and has a shape extending in a strip shape along the long side direction of the light guide plate 19. This portion 94a may be particularly referred to as a clamping surface 94a. The outer side of the upper jaw 96 is flat and integrated with the front surface 19 a of the light guide plate 19. On the other hand, on the inner side of the lower jaw portion 97, a clamping portion 95 that covers the first insertion chamber 91 from the lower side is provided. The sandwiching portion 95 has a shape recessed in a concave shape on the lower side so that it can be fitted to the other end portion 52 in the lateral direction of the LED substrate 5. The most depressed portion 95 a of the sandwiching portion 95 is flat and extends in a strip shape along the long side direction of the light guide plate 19. The outer side of the lower jaw 97 is flat and integrated with the plate surface 19 b on the back side of the light guide plate 19.

The second insertion chamber 92 faces the wall surface 93 arranged along the thickness direction (Z-axis direction) of the light guide plate 19 and along the longitudinal direction (X-axis direction) of the light guide plate 19. The wall surface 93 is arranged in parallel with the end surface 19 f on the long side of the light guide plate 19.

The light guide plate 19 provided with the notch insertion portion 90 at the end 191 is manufactured using a known manufacturing technique. For example, the light guide plate 19 may be manufactured by cutting the end portion of the plate-like member into a predetermined shape, or the light guide plate 19 including the notch insertion portion 90 having a predetermined shape may be manufactured by molding. .

FIG. 5 is a perspective view schematically showing a process of inserting the light source module 3 into the notch insertion portion 90 provided at the end 191 of the light guide plate 19. FIG. 5 shows a simplified light source module 3 and light guide plate 19 for convenience of explanation. When the light source module 3 is attached to the notch insertion portion 90 of the light guide plate 19, the light source module 3 is inserted into the notch insertion portion 90 from one end surface 19c side on the short side toward the other end surface 19d on the short side side. It is. When the light source module 3 is inserted into the notch insertion portion 90, the upper end portion 51 in the short direction (the direction of the arrow L2 in FIG. 5) is fitted with the concave sandwiching portion 94, and the lower end portion 52 in the short direction is The LED board 5 advances along the penetration direction of the notch insertion part 90 toward the other end surface 19d of a short side from the end surface 19c side in the state fitted with the recessed holding part 95. FIG. The light source module 3 is fixed in a stationary state at a central portion in the penetration direction of the notch insertion portion 90.

FIG. 6 is a perspective view schematically showing the light guide plate 19 in a state in which the light source module 3 is inserted into the notch insertion portion 90. The LED substrate 5 of the light source module 3 has a first direction of the notch insertion portion 90 such that its longitudinal direction (direction of arrow L1 in FIG. 5) is along the penetration direction of the notch insertion portion 90 (long side direction of the light guide plate 19). It is inserted into the insertion chamber 91. In the present embodiment, the length of the LED substrate 5 in the longitudinal direction is set to be shorter than the length of the notch insertion portion 90 (length in the penetration direction). The LED substrate 5 is housed in the first insertion chamber 91 of the notch insertion portion 90 in a state where both end

portions

53 and 54 in the longitudinal direction enter the inside of the light guide plate 19 from the end surfaces 19c and 19d, respectively. The LED substrate 5 is fixed to the end portion 191 of the light guide plate 19 in a state where both end portions (upper end portion 51 and lower end portion 52) in the short direction are sandwiched from above and below by a pair of sandwiching

portions

94 and 95. Yes. In the first insertion chamber 91, the LED substrate 5 is fixed such that the short side direction L 2 is along the thickness direction of the light guide plate 19 and the plate surface 5 a faces the wall surface 93.

In addition, when the LED substrate 5 or the light guide plate 19 is affected by temperature (heat) or humidity, respectively, and expands (for example, thermal expansion) or contracts (for example, thermal contraction), the light source module 3 is connected to the light guide plate 19. On the other hand, the LED substrate 5 is sandwiched by the holding portions 94, to the extent that the light guide plate 19 can be relatively moved (slidably moved) along the longitudinal direction of the light guide plate 19 (the longitudinal direction L2 of the LED substrate 5 and the through direction of the notch insertion portion 90). 95.

The light source module 3 is housed in the notch insertion portion 90 of the light guide plate 19 such that the LED light source 4 faces the inside of the light guide plate 19. As shown in FIG. 3, the LED substrate 5 of the light source module 3 is housed in the first insertion chamber 95, and the LED light source 4 is housed in the second insertion chamber 92. The LED light source 4 is housed in the second insertion chamber 92 so as to face the side wall 93. A very small gap is provided between the LED light source 4 and the side wall 93.

The light guide plate 19 is accommodated in the chassis 14 with the light source module 3 attached to the end 191. In the chassis 14, the plate surface 19 b on the back side of the light guide plate 19 faces the bottom plate 14 a with the reflection sheet 20 interposed therebetween. Further, the end surfaces 19c and 19d on the short side of the light guide plate 19 face the

walls

14c and 14d of the chassis 14, respectively, and the end surfaces 19e and 19f on the long side of the light guide plate 19 face the

walls

14e and 14f of the chassis, respectively. ing. A plurality of locking pins (not shown) are erected on the bottom plate 14a. The locking pins are inserted into the light guide plate 19 from the back plate surface 19b, so that the light guide plate 19 is placed in the chassis 14. It is positioned.

The side wall 93 facing the LED light source 4 is a light incident surface 93 on which light emitted from the LED light source 4 is incident. Further, the front surface (surface) 19a of the light guide plate 19 is a light exit surface 19a, and the light incident on the light incident surface 93 and the optical sheet 15 disposed above the light guide plate 19 and The light is emitted toward the liquid crystal panel 11. A plate surface 19 b on the back side of the light guide plate 19 is covered with a reflection sheet 20. The reflection sheet 20 reflects light incident on the light guide plate 19 from the light incident surface 93 and rises toward the front plate surface (light emitting surface) 19a.

In addition, on the front plate surface (light emitting surface) 19a or the back plate surface 19b of the light guide plate 19, a reflection portion that reflects light in the light guide plate 19 or a scattering portion that scatters has a predetermined in-plane distribution. Thus, the light emitted from the plate surface (light emitting surface) 19a is adjusted so as to have a uniform distribution in the surface.

As shown in FIG. 2, the optical sheet 15 has a horizontally long rectangular shape when viewed from the front side, like the liquid crystal panel 11 and the like. The optical sheet 15 includes a laminate of a diffusion sheet 15a, a lens sheet 15b, and a reflective polarizing sheet 15c. The optical sheet 15 is placed on the plate surface 19 a so as to cover the front plate surface (light emitting surface) 19 a of the light guide plate 19. The size of the optical sheet 15 is set to be approximately the same as the size of the plate surface 19 a of the light guide plate 19.

The frame 21 is a frame-like (frame-like) member along the periphery of the liquid crystal panel 11 and the light guide plate 19 and is made of synthetic resin or the like. The frame 21 is black and has a light shielding property. The frame 21 presses the end of the light guide plate 19 from the front side over substantially the entire circumference. The frame 21 is covered from the upper ends of the

walls

14c, 14d, 14e, and 14f of the chassis 14 that houses the light guide plate 19 and the like. The frame 21 is fixed to each

wall

14c, 14d, 14e, 14f of the chassis 14 by fixing means (not shown) such as screws. Note that the periphery of the liquid crystal panel 11 is placed on the inner edge of the frame 21.

The liquid crystal panel 11 is attached to the chassis 14 with its peripheral edge sandwiched between the frame 21 and the above-described bezel 13 covered from the front side of the frame 21. The bezel 13 is fixed to the

walls

14c, 14d, 14e, and 14f of the chassis 14 together with the frame 21 and the like by fixing means (not shown) such as screws.

When the liquid crystal display device 10 displays an image on the display surface 11a of the liquid crystal panel 11, each LED light source 4 of the light source module 3 included in the illumination device 12 emits light (lights up). When each LED light source 4 emits light, light enters the light guide plate 19 from the light incident surface 93 of the light guide plate 19. The incident light is reflected by the reflection sheet 20 laid on the back side of the light guide plate 19, the reflection part formed on the back surface (plate surface) 19 b or the front surface (plate surface) 19 a of the light guide plate 19, etc. The light is emitted from the front plate surface (light emitting surface) 19 a while proceeding through the light guide plate 19. The light emitted from the plate surface 19a passes through the optical sheet 15 and spreads into a planar shape, and illuminates the liquid crystal panel 11 from the back surface 11b. The liquid crystal panel 11 displays an image on the display surface 11a using the light from the illumination device 12.

Here, the light source module 3 inserted into the notch insertion portion 90 of the light guide plate 19 will be further described. The light source module 3 is attached to the end 191 of the light guide plate 19 using the notch insertion portion 90. Moreover, the light source module 3 is in a state where it is stationary in the notch insertion portion 90 when both end portions (upper end portion 51 and lower end portion 52) of the LED substrate 5 are sandwiched between the pair of sandwiching

portions

94 and 95. It is fixed. At this time, the upper end surface 51 a of the LED substrate 5 is in contact with the clamping surface 94 a of the clamping unit 94, and the lower end surface 52 a of the LED substrate 5 is in contact with the clamping surface 95 a of the clamping unit 95. That is, the LED substrate 5 is sandwiched between the sandwiching surface 94a and the sandwiching surface 95a in the short direction. The distance between the clamping surface 94a and the clamping surface 95a is set to be the same as or slightly smaller than the width of the LED substrate 5 in the short direction. In the case of the present embodiment, the upper end portion 51 of the LED substrate 5 is fitted into a concave holding portion 94, and the inner wall surface of the holding portion 94 also from the thickness direction (Y-axis direction) of the LED substrate 5. It is pinched by. Further, the lower end portion 52 of the LED substrate 5 is fitted into a concave sandwiching portion 95 and is sandwiched by the sandwiching portion 95 from the thickness direction (Y-axis direction) of the LED substrate 5. The LED light source 4 mounted on the LED substrate 5 faces the wall surface (light incident surface) 93 with a predetermined interval (gap) therebetween.

Thus, the light source module 3 can be directly attached to the end 191 of the light guide plate 19 without using fixing means such as screws. That is, in the illumination device 12 of the present embodiment, the shadow of the fixing means such as a screw for fixing the light source module 3 (LED substrate 5) does not enter the light emitting surface 19a of the light guide plate 19 to form a dark part. . Therefore, the illumination device 12 of the present embodiment can suppress the occurrence of luminance unevenness due to the fixing means such as screws.

Further, in the lighting device 12 of the present embodiment, when the light guide plate 19 is thermally expanded, the end portion 191 of the light guide plate 19 mainly extends along the long side direction (X-axis direction) of the light guide plate 19. The extension (and contraction) in the thickness direction (Z-axis direction) at the end portion 191 of the light guide plate 19 and the extension (and contraction) in the short side direction (Y-axis direction) at the end portion 191 of the light guide plate 19 are guided. Compared with the expansion (and contraction) in the long side direction (X-axis direction) of the optical plate 19, these are negligible because they hardly affect the size of the notch insertion portion 90.

Further, when the LED board 5 is thermally expanded, the LED board 5 mainly extends in the longitudinal direction (X-axis direction). In addition, the expansion | extension (and shrinkage | contraction) in the transversal direction (X-axis direction) of LED board 5 and the expansion | extension (and shrinkage | contraction) in the thickness direction (Y-axis direction) of LED board 5 are the expansion | extension (longitudinal direction) of LED board 5 ( And they are negligible because they hardly affect the size of the LED substrate 5.

When the temperature in the lighting device 12 rises when the lighting device 12 is used, the light guide plate 19 and the LED substrate 5 are both thermally expanded and extended in the X-axis direction. The thermal expansion coefficient of the light guide plate 19 and the thermal expansion coefficient of the LED substrate 5 are different from each other. In the case of the present embodiment, the end 191 (notch insertion portion 90) of the light guide plate 19 and the LED substrate 5 are not fixed in the X-axis direction. And the LED substrate 5 can move relative to each other along the X-axis direction. For example, when the extension of the light guide plate 19 is larger than the extension of the LED substrate 5, both end surfaces 19 c and 19 d of the end portion 191 of the light guide plate 19 are moved away from both

end portions

53 and 54 in the longitudinal direction of the LED substrate 5. Moving. In addition, the notch insertion part 90 in the edge part 191 of the light-guide plate 19 is extended | stretched along the penetration direction (longitudinal direction of the light-guide plate 19). On the other hand, when the extension of the LED substrate 5 is larger than the extension of the light guide plate 19, both

end portions

53 and 54 in the longitudinal direction of the LED substrate 5 are respectively provided on both end surfaces 19 c and 19 d of the end portion 191 of the light guide plate 19. Move to get closer.

Even when the light guide plate 19 and the LED substrate 5 are both contracted in the X-axis direction, the end portion 191 (notch insertion portion 90) of the light guide plate 19 and the LED substrate 5 are along the X-axis direction. It can move relatively.

Therefore, in the lighting device 12 of this embodiment, even if the light guide plate 19 expands and contracts, the light source module 3 (LED substrate 5) collides with the end 191 (notch insertion portion 90) of the light guide plate 19 and the like. No interference.

The light source module 3 (LED substrate 5) is sandwiched by the sandwiching

portions

94 and 95 from the short direction, which is the direction in which the LED substrate 5 is less stretched, and the sandwiching

portions

94 and 95 are formed of the light guide plate. 19 is arranged in the thickness direction, which is a direction in which there is little expansion and contraction. Therefore, the light source module 3 housed in the end portion 191 (notch insertion portion 90) of the light guide plate 19 has the LED substrate 5 even if the light guide plate 19 and the LED substrate 5 expand and contract in a predetermined direction (X-axis direction). Is held by the clamping

portions

94 and 95, and the LED substrate 5 and the LED light source 4 are not tilted. Therefore, even if the end portion 191 (notch insertion portion 90) of the light guide plate 19 and the LED substrate 5 expand and contract as described above, the distance between the LED light source 4 mounted on the LED substrate 5 and the light incident surface 93. (Spacing) is substantially unchanged. That is, of the light emitted from the LED light source 4, the ratio of light incident on the light incident surface 93 (light incident efficiency) hardly changes substantially. Therefore, the illumination device 12 of the present embodiment also suppresses the occurrence of luminance unevenness due to the change in the light incident efficiency in the light emitted from the light emitting surface 19a. Further, the LED light source 4 is prevented from colliding with the light emitting surface 19a and being damaged.

Even when the light guide plate 19 is deformed as a whole, the light source module 3 is directly attached to the end portion 191 of the light guide plate 19 as described above. Of the emitted light, the ratio of light incident on the light incident surface 93 (light incident efficiency) substantially does not change. Further, the LED light source 4 is prevented from colliding with the light emitting surface 19a and being damaged.

Further, the occurrence of uneven brightness is also suppressed for the liquid crystal display device 10 including the illumination device 12 of the present embodiment and the television receiver TV.

<Embodiment 2>
Next, Embodiment 2 of the present invention will be described with reference to FIG. In the following embodiments, the same parts as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and detailed description thereof is omitted.

FIG. 7 is a cross-sectional view of the liquid crystal display device 10A according to the second embodiment. The portion of the liquid crystal display device 10A shown in FIG. 7 corresponds to the portion of the liquid crystal display device 10 of the first embodiment shown in FIG. The basic configuration of the liquid crystal display device 10A of the present embodiment is the same as that of the first embodiment. However, the liquid crystal display device 10A of the present embodiment is different from that of the first embodiment in that two

notch insertion portions

90, 90 are provided on the light guide plate 19 provided in the illumination device 12A.

Notch insertion portions

90 and 90 are provided at two

end portions

191 and 192 on the long side of the light guide plate 19, respectively. The LED substrate 5 (light source module 3) on which the LED light source 4 is mounted is inserted into each notch insertion portion 90. As described above, the notch insertion portions 90 may be provided at the plurality of ends of the light guide plate 19 and the light source modules 3 may be attached to the respective ends.

<Embodiment 3>
Next, Embodiment 3 of the present invention will be described with reference to FIGS. In the present embodiment, the light guide plate 19A used for the lighting device and the light source module 3 attached to the end 191A of the light guide plate 19A using the notch insertion portion 90A are mainly illustrated.

FIG. 8 is a plan view schematically showing the light guide plate 19A used in the illumination device of the third embodiment. The light guide plate 19A has a rectangular shape when seen in a plan view, and a notch insertion portion 90A is provided at the end 191A. The light guide plate 19A is made of a plate-like member made of the same material as in the first embodiment. The light guide plate 19A includes a front plate surface (light emitting surface) 19Aa, a back plate surface 19Ab, and end surfaces 19Ac, 19Ad, 19Ae, and 19Af.

FIG. 9 is a side view of the light guide plate 19A shown in FIG. As shown in FIGS. 8 and 9, the notch insertion portion 90 A of the present embodiment has a concave shape from the front plate surface 19 Aa toward the back plate surface 19 Ab. The cutout insertion portion 90A includes a first insertion chamber 91A and a second insertion chamber 92A.

The first insertion chamber 91A is a place where the LED substrate 5 of the light source module 3 is inserted, and as shown in FIG. 9, the first insertion chamber 91A has a shape that is dug down from the plate surface 19Aa of the light guide plate 19A toward the plate surface 19Ab. I am doing. The first insertion chamber 91A does not penetrate the light guide plate 19A and has a bottom. In addition, the second insertion chamber 92A is a place where the 1ED light source 4 mounted on the LED substrate 5 is inserted. Like the first insertion chamber 91A, the second insertion chamber 92A faces the plate surface 19Ab from the plate surface 19Aa of the light guide plate 19A. It looks like it was dug down. However, a plurality of second insertion chambers 92A are provided at the end portion 191A of the light guide plate 19A (two in this embodiment), and the LED light sources 4 are inserted into the respective second insertion chambers 92A. The second insertion chamber 92A is set to have a shallower bottom than the first insertion chamber 91A.

FIG. 10 is a perspective view schematically showing a step of inserting the light source module 3 into the notch insertion portion 90A provided at the end portion 191A of the light guide plate 19A. As shown in FIG. 10, in the case of this embodiment, the light source module 3 is inserted from the front side plate surface 19Aa of the light guide plate 19A toward the back side plate surface 19Ab. That is, the LED substrate 5 of the light source module 3 is notched so that its short direction (the direction of the arrow L2 shown in FIG. 10) is along the recess direction of the notch insertion portion 90A (the thickness direction of the light guide plate 19A). Inserted into the portion 90A.

FIG. 11 is a plan view schematically showing the light guide plate 19A in a state where the light source module 3 is inserted into the notch insertion portion 90A. As shown in FIG. 11, the LED light source 4 is housed in the second insertion chamber 92A, and faces the side wall 93A facing the second insertion chamber 92A. The side wall 93A is a light incident surface 93A on which light emitted from the LED light source 4 is incident. Note that the LED light source 4 is opposed to the side wall (light incident surface) 93 A with a predetermined interval (a very small gap) therebetween. The second insertion chamber 92 A is set to be slightly larger than the LED light source 4. Therefore, even if the light guide plate 19A is thermally expanded, the LED light source 4 is prevented from coming into contact with the wall surface (side wall 93A) surrounding the second insertion chamber 92A.

In contrast, the LED substrate 5 is housed in the first insertion chamber 91A. And the LED board 5 is being fixed in the state where the thickness direction was pinched | interposed by a pair of clamping

part

192A, 292A (refer FIG. 8). The sandwiching portion 192A faces the first insertion chamber 91A and contacts the plate surface 5a on the front side of the LED substrate 5. The sandwiching portion 292 A faces the first insertion chamber 91 A and contacts the plate surface 5 b on the back side of the LED substrate 5. The interval (distance) between the holding portion 192A and the holding portion 292A is set to be approximately the same as the thickness of the LED substrate 5 or slightly smaller than the thickness.

In addition, one end 53 in the longitudinal direction of LED substrate 5 (the direction of arrow L1 shown in FIG. 10) is opposed to wall surface 392A facing first insertion chamber 91A with a gap (gap) D1, and the other The end 54 is opposed to the wall surface 492A facing the first insertion chamber 91A with an interval (gap) D2.

As described above, the light source module 3 is attached to the end portion 191A of the light guide plate 19A using the notch insertion portion 90A. The light source module 3 is fixed in a stationary state in the notch insertion portion 90A when the thickness direction of the LED substrate 5 is sandwiched between the pair of sandwiching

portions

192A and 292A. In this manner, the light source module 3 (LED substrate 5) can be directly attached to the end portion 191A of the light guide plate 19A without using fixing means such as screws for fixing the light source module 3 (LED substrate 5). That is, in the illuminating device including the light guide plate 19A and the light source module 3 according to the present embodiment, the shadow of the fixing means such as a screw for fixing the light source module 3 (LED substrate 5) enters the emission surface 19Aa of the light guide plate 19A. And no dark part is formed. Therefore, in the illumination device of this embodiment, the occurrence of uneven brightness due to the fixing means such as a screw is suppressed.

Further, in the lighting device of the present embodiment, when the light guide plate 19A is thermally expanded, the end portion 191A of the light guide plate 19A mainly extends in the direction (X-axis direction) along the end surface 19Ae and the end surface 19Af of the light guide plate 19A. To do. Note that the end portion 191A of the light guide plate 19A extends (and contracts) in the thickness direction (Z-axis direction), and the end portion 191A of the light guide plate 19A extends in the end surface 19Ac and the end surface 19Ad along the end surface 19Ad (Y-axis direction). And contraction) are very small compared to the expansion (and contraction) in the direction (X-axis direction) along the end surface 19Ae and end surface 19Af of the light guide plate 19A, and they almost affect the size of the notch insertion portion 90A. Because there is no, it can be ignored.

In addition, when the LED substrate 5 is thermally expanded, it is as described in the first embodiment. That is, the LED substrate 5 extends mainly in the longitudinal direction (X-axis direction).

When the temperature in the lighting device rises when the lighting device is used, the light guide plate 19A and the LED substrate 5 are both thermally expanded and extend in the X-axis direction. In the case of the present embodiment, the end portion 191A (notch insertion portion 90A) of the light guide plate 19A and the LED substrate 5 are not fixed in the X-axis direction, and therefore the end portion 191 (notch insertion portion 90A) of the light guide plate 19A. The LED substrate 5 can move relative to each other along the X-axis direction. For example, when the extension of the light guide plate 19A is larger than the extension of the LED substrate 5, the wall surface 392A and the wall surface 492A provided at the end portion 191A of the light guide plate 19A are the end portion 53 and the end portion in the longitudinal direction of the LED substrate 5. Move away from 54 respectively. Note that the notch insertion portion 90A in the end portion 191A of the light guide plate 19A also extends along the X-axis direction. On the other hand, when the extension of the LED substrate 5 is larger than the extension of the light guide plate 19A, the end in the longitudinal direction of the LED substrate 5 is placed on the wall surface 392A and the wall surface 492A provided at the end 191A of the light guide plate 19A. The part 53 and the end part 54 move so as to approach each other.

Further, even when the light guide plate 19A and the LED substrate 5 are both contracted in the X-axis direction, the end portion 191A (notch insertion portion 90A) of the light guide plate 19A and the LED substrate 5 are along the X-axis direction. It can move relatively.

The intervals (gap) D1 and D2 are set in advance so that the end portion 53 and the end portion 54 of the LED substrate 5 do not come into contact with the wall surface 392A and the wall surface 492A even when the light guide plate 19A or the like expands or contracts. Yes.

Therefore, in the lighting device of the present embodiment, even if the light guide plate 19A expands and contracts, the light source module 3 (LED substrate 5) collides with the end 191A (notch insertion portion 90A) of the light guide plate 19A, etc. There is no interference.

The light source module 3 (LED substrate 5) is sandwiched by the sandwiching

portions

192A and 292A from the thickness direction in which the LED substrate 5 is less stretched, and the sandwiching

portions

192A and 292A are disposed on the light guide plate 19A. Are arranged in the Y-axis direction, which is a direction in which the expansion and contraction of the lens is small. Since the width (width in the Y-axis direction) of the end portion 191A of the light guide plate 19A is short, the expansion and contraction in the Y-axis direction of the end portion 191A of the light guide plate 19A is reduced. Therefore, the light source module 3 housed in the end portion 191A (notch insertion portion 90A) of the light guide plate 19A has the LED substrate 5 even if the light guide plate 19A and the LED substrate 5 expand and contract in a predetermined direction (X-axis direction). Is held by the sandwiching

portions

192A and 292A, and the LED substrate 5 and the LED light source 4 do not tilt. Therefore, even if the end portion 191A (notch insertion portion 90A) of the light guide plate 19A and the LED substrate 5 expand and contract as described above, the distance between the LED light source 4 mounted on the LED substrate 5 and the light incident surface 93A. (Spacing) is substantially unchanged. That is, of the light emitted from the LED light source 4, the ratio of light incident on the light incident surface 93A (light incident efficiency) is substantially unchanged. Therefore, the illumination device according to the present embodiment also suppresses the occurrence of luminance unevenness due to the change in the light incident efficiency in the light emitted from the light emitting surface 19Aa. Furthermore, the LED light source 4 is also prevented from being damaged by colliding with the light emitting surface 19Aa.

Further, even when the light guide plate 19A is warped as a whole, the light source module 3 is directly attached to the end portion 191A of the light guide plate 19A as described above. Of the emitted light, the proportion of light incident on the light incident surface 93A (light incident efficiency) substantially does not change. Furthermore, the LED light source 4 is also prevented from being damaged by colliding with the light emitting surface 19Aa.

Also, the occurrence of uneven brightness is also suppressed for the liquid crystal display device and the television receiver provided with the illumination device of the present embodiment.

<Embodiment 4>
Next, Embodiment 4 of the present invention will be described with reference to FIG. In this embodiment, the light guide plate 19B used for the lighting device and the light source module 3 attached to the

end portions

191B, 192B, 193B, 194B of the light guide plate 19B using the notch insertion portion 90B are illustrated. To do.

FIG. 12 is a plan view schematically showing a state in which the light source module 3 is inserted into the notch insertion portion 90B of the light guide plate 19B included in the illumination device of the fourth embodiment. The light guide plate 19B has a rectangular shape when seen in a plan view, and a notch insertion portion 90B is provided at each of the four

end portions

191B, 192B, 193B, 194B. The light guide plate 19B is made of a plate-like member made of the same material as in the first embodiment. The light guide plate 19B includes a front-side plate surface (light emitting surface) 19Ba, a back-side plate surface 19Bb, and end surfaces 19Bc, 19Bd, 19Be, and 19Bf. Further, the notch insertion portion 90B has the same configuration as that of the third embodiment, and has a shape that is recessed from the front-side plate surface 19Ba toward the back-side plate surface 19Bb.

The light source module 3 is inserted into each notch insertion portion 90B. Thus, the light source module 3 may be attached to each of the four

end portions

191B, 192B, 193B, 194B of the light guide plate 19B. In addition, the fixing method of the light source module 3 in each notch insertion part 90B is the same as that of Embodiment 3.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.

(1) In Embodiment 1 described above, a very slight gap is provided between the LED light source 4 and the light incident surface 93. In another embodiment, for example, the light source module 3 may be inserted into the notch insertion portion 90 in a state where the gap is eliminated and the tip of the LED light source 4 is in contact with the light incident surface 93. Similarly, in Embodiment 3 and the like, the light source module 3 may be inserted into the notch insertion portion 90A with the tip of the LED light source 4 in contact with the light incident surface 93A.

(2) In the first embodiment, the notch insertion portion 90 is divided into the upper jaw portion 96 and the lower jaw portion 97 by the notch groove 98. In another embodiment, the upper jaw portion 96 and the lower jaw portion 97 may be connected without providing the notch groove 98. That is, the back surface (back plate surface 5 b) side of the LED substrate 5 may be covered with a part of the light guide plate 19.

(3) In the first embodiment, the LED substrate 5 of the light source module 3 is fixed in the notch insertion portion 90 by being sandwiched between the pair of sandwiching

portions

94 and 95. That is, the LED substrate 5 is fixed in a state where the upper end portion 51 of the LED substrate 5 is fitted with the concave holding portion 94 and the lower end portion 52 is fitted with the concave holding portion 95. In another embodiment, for example, the inner surface shape of the clamping

portions

94 and 95 may be flat instead of the concave shape. In other words, at least the LED substrate 5 may be sandwiched by the sandwiching

portions

94 and 95 from the short side direction.

(4) In the first embodiment and the like, the LED substrate 5 is fixed using the sandwiching portions 94 and 95 (or the sandwiching

portions

192A and 292A). In another embodiment, for example, an elastic member made of urethane foam or the like is filled between the wall surface facing the first insertion chamber 91 and the LED substrate 5, and the light source module 3 is placed in the notch insertion portion 90. It may be fixed.

(5) In the first embodiment, the notch insertion portion 90 is provided in parallel along the longitudinal direction of the light guide plate 19. In other embodiments, if necessary, the notch insertion portion 90 may be provided so as to be inclined with respect to the longitudinal direction of the light guide plate 19, for example.

(6) In the first embodiment, both

end portions

53 and 54 in the longitudinal direction of the LED substrate 5 are accommodated in the end portion 191 (notch insertion portion 90) of the light guide plate 19. In another embodiment, for example, one end portion or both end portions in the longitudinal direction of the LED substrate 5 may protrude outside the light guide plate 19.

(7) In the first embodiment, the short side direction of the LED substrate 5 is arranged along the thickness direction of the light guide plate 19. In other embodiments, for example, the LED substrate 5 may be fixed so as to be inclined with respect to the thickness direction of the light guide plate 19 as necessary.

(8) In the first embodiment, the notch insertion portion 90 is formed from a hole that passes through the end portion 191 of the light guide plate 19. In another embodiment, for example, a configuration in which one end of the hole is closed may be used.

(9) In the first embodiment, the LED light source 4 is inserted into the second insertion chamber 92. In another embodiment, for example, a connector mounted on the plate surface 5 a of the LED substrate 5 may be inserted into the second insertion chamber 92. The connector is mounted on the LED board 5 in order to relay power supplied from the outside to each LED light source 4 mounted on the LED board 5. In another embodiment, the LED board 5 (for example, an end portion in the longitudinal direction of the LED board 5) where the connector is mounted may be set to protrude outside the light guide plate 19.

(10) In another embodiment, two types of notch insertion portions 90 and notch insertion portions 90A may be provided for one light guide plate 19.

DESCRIPTION OF SYMBOLS 10 ... Liquid crystal display device (display device), 11 ... Liquid crystal panel (display panel), 12 ... Illumination device (backlight device), 13 ... Bezel, 14 ... Chassis (housing member) , 15 ... Optical sheet, 19 ... Light guide plate, 90 ... Notch insertion part, 191 ... End part of light guide plate, 20 ... Reflective sheet, 21 ... Frame

Claims

A light source;
A light source substrate on which the light source is mounted;
A light guide plate composed of a plate-like member, having a shape in which a part thereof is cut out at an end of the plate-like member, and provided with a cut-out insertion portion into which the light source substrate is inserted. And a light guide plate into which the light source substrate is inserted so that light from the light source enters the inside of the plate-like member.
The lighting device according to claim 1, wherein the notch insertion portion has a shape penetrating through the end of the plate member.
The lighting device according to claim 2, wherein the light source substrate is formed of a long substrate, and is inserted into the notch insertion portion so that a longitudinal direction thereof is along a penetrating direction.
The illuminating device according to claim 3, wherein the notch insertion portion includes a pair of clamping portions that sandwich both end portions in the short direction of the light source substrate.
The illuminating device according to claim 4, wherein the sandwiching portion has a recess that fits with an end portion in a short direction of the light source substrate.
The said notch insertion part has an upper jaw part and a lower jaw part from which the said clamping parts expand mutually elastically, when the said light source board | substrate is inserted in the said notch insertion part. 5. The lighting device according to 5.
The lighting device according to claim 1, wherein the notch insertion portion has a shape in which the end portion of the plate-like member is recessed from one plate surface of the plate-like member toward the other plate surface.
The illuminating device according to claim 7, wherein the light source substrate is formed of a long substrate, and is inserted into the notch insertion portion so that a short direction thereof is along a recess direction.
The lighting device according to claim 8, wherein the notch insertion portion includes a pair of sandwiching portions that sandwich the light source substrate from a thickness direction of the light source substrate.
The lighting device according to any one of claims 7 to 9, wherein the notch insertion portion has a gap with an end portion in a longitudinal direction of the light source substrate.
A display device comprising: the illumination device according to any one of claims 1 to 10; and a display panel that performs display using light from the illumination device.
The display device according to claim 11, wherein the display panel is a liquid crystal panel in which liquid crystal is sealed between a pair of substrates.
A television receiver comprising the display device according to claim 11 or 12.