WO2013073458A1 - Illumination device, display device, and television reception device - Google Patents

Abstract

This illumination device (12) is provided with: a light source (17); a light guide plate (16) in which multiple plate-shaped units (61, 62) are arranged in a manner such that the edge surfaces (61e, 62f) thereof abut each other and which has light incidence surfaces (16c, 16d) into which the light from the light source (17) enters, and a light-emitting surface (16a) which emits the light entering from the light incidence surface (16c) and such; a chassis (14); an engagement edge surface (16f) which is provided to the chassis (14) and which constitutes one edge surface of the light guide plate (16) in the arrangement direction of the plate-shaped units (61, 62) or a first engagement part (21) which constitutes the edge surface of plate-shaped unit (61) including the engagement edge surface (16f) and which engages with adjacent edge surfaces (61c, 61d) that are adjacent to the engagement edge surface; and a biasing member (20) which is attached to the opposite edge surface (16e) of the light guide plate (16) that is on the opposite side of the engagement edge surface (16f) and which biases the light guide plate (16) towards the first engagement part (21).

Description

Lighting device, display device, and television receiver

The present invention relates to a lighting device, a display device, and a television receiver.

Liquid crystal panels are used in display devices such as televisions, mobile phones, and portable information terminals. The liquid crystal panel needs to use external light in order to display an image. Therefore, as shown in Patent Document 1, this type of display device includes an illumination device (a so-called backlight device) for supplying light to the liquid crystal panel in addition to the liquid crystal panel. This illuminating device is arranged on the back side of the liquid crystal panel, and is configured to irradiate the light spread in a planar shape toward the back side of the liquid crystal panel.

As the illuminating device, as disclosed in Patent Document 1, a so-called edge light type including a light guide plate made of a transparent plate-like member and a light source arranged so as to face an end surface of the light guide plate. (Side-light type) is known. As the light guide plate, an integral (so-called single-piece) plate-shaped member made of a transparent synthetic resin such as an acrylic resin is generally used. In addition, as shown in Patent Document 2, in an illuminating device used in a display device in which a display area divided into a plurality of areas (areas) is dimmed for each area, a plurality of blocks (light guide blocks) are used. ) Is used as a light guide plate.

JP 2011-103236 A JP 2010-205504 A

(Problems to be solved by the invention)
By the way, in recent years, with an increase in the size of a display device, an increase in the size of an edge light type illumination device is also required. The large illuminating device requires a light guide plate that is larger (larger) than the conventional light guide plate. However, in the existing manufacturing equipment, a so-called single large light guide plate cannot be manufactured, which is a problem. For example, it is possible to use a combination of a plurality of light guide plates that can be manufactured by existing manufacturing equipment as one large light guide plate, but the adhesion between the end faces of adjacent light guide plates is not sufficient. , Light may leak from the end face. When light leaks from the end face, unevenness of brightness (straight unevenness) along the end face occurs in the light emitted from the illumination device including the light guide plate, which is a problem.

An object of the present invention is to provide a technique or the like for improving the adhesion between end faces of adjacent plate units in an illuminating device including a light guide plate formed by combining a plurality of plate units.

(Means for solving the problem)
The illuminating device according to the present invention is a plate-like member in which a light source and a plurality of plate-like units are arranged in a state in which their end faces are abutted with each other, and is composed of one end face of the plate-like member. A light guide plate having a light incident surface on which light is incident, a light emitting surface which is formed of a front plate surface of the plate member and emits light incident from the light incident surface from the front plate surface; A chassis disposed on the back side of the optical plate, and an engagement end surface that is provided on the chassis and that is one end surface of the light guide plate disposed in the arrangement direction of the plate units, or a plate shape including the engagement end surface A first engaging portion that engages with an end face of the unit that is adjacent to the engaging end face, and is directed to the opposite end face of the light guide plate on the opposite side of the engaging end face, and the light guide plate A biasing member that biases the first engagement portion toward the first engagement portion side; Equipped with a.

In the illuminating device, the first engagement portion is inserted into the engagement end surface or the adjacent end surface, and the cutout-shaped first cover is engaged with the first engagement portion along the alignment direction. An engaging part may be provided.

The lighting device includes a wall portion provided in the chassis and opposed to the opposite end surface in a state of being spaced, and the biasing member is accommodated in the space, and the light guide plate is It may be made of an elastic body that elastically biases toward the first engagement portion side.

In the illuminating device, a part of the opposite end surface is notched, and a second engaged portion that extends along the arrangement direction and the second engaged portion is inserted into the second engagement portion. And a second engaging portion provided on the chassis that engages with an inner edge portion of the second engaged portion arranged in a vertical direction.

In the illuminating device, a pair of third engaging portions provided in the chassis that face each other via the plate-like unit in a direction perpendicular to the arrangement direction and engage with an end surface of the plate-like unit. May be provided.

In the illumination device, a notched third engaged portion into which the third engaging portion is inserted may be provided on an end surface of the plate-like unit.

In the lighting device, the urging member may be covered with a light-reflective coating. When the surface of the urging member is covered with a light-reflective coating, light is suppressed from being absorbed by the urging member. As a result, a decrease in luminance of the lighting device can be suppressed.

In the illumination device, the light source may be an LED light source.

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, in an illuminating device including a light guide plate formed by combining a plurality of plate-like units, there is provided a technique for increasing the adhesion between the end surfaces of adjacent plate-like units.

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 Top view of lighting device Sectional view along the short side of the liquid crystal display Sectional view along the long side direction of the liquid crystal display device Enlarged plan view of the first engaging portion and the first engaged portion Enlarged plan view of the second engaging portion and the second engaged portion The top view of the illuminating device which concerns on Embodiment 2. FIG. C-C 'line sectional view of FIG. Enlarged plan view of the third engaging portion and the third engaged portion Enlarged plan view of another third engaging portion and another third engaged portion The top view of the illuminating device which concerns on Embodiment 3. FIG. The top view of the illuminating device which concerns on Embodiment 4. FIG. The top view of the illuminating device which concerns on Embodiment 5. FIG.

<Embodiment 1>
Embodiment 1 of the present invention will be described with reference to FIGS. In the present embodiment, an illumination device 12, a liquid crystal display device (an example of a display device) 10 including the illumination device 12, and a television receiver TV including the liquid crystal display device 10 are illustrated. Each drawing shows an X-axis, a Y-axis, and a Z-axis, and the directions of the axes are drawn in common directions in the drawings. Moreover, let the upper side shown by FIG.2 and FIG.3 be a front side, and let the lower side of the figure be a 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).

2 is an exploded perspective view showing a schematic configuration of the liquid crystal display device 10, FIG. 3 is a plan view of the illumination device 12, and FIG. 4 is a cross-sectional view of the liquid crystal display device 10 along the short side direction. FIG. 5 is a cross-sectional view of the liquid crystal display device 10 along the long side direction. Note that FIG. 3 shows the lighting device 12 in a state where the optical sheet 15 and the frame 24 are removed for convenience of explanation. 4 is a cross-sectional view of the liquid crystal display device 10 taken along a line corresponding to the line AA ′ in FIG. 3. FIG. 5 is a cross-sectional view taken along a line corresponding to the line BB ′ in FIG. FIG. 3 is a cross-sectional view of the liquid crystal display device 10 made. 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 a chassis 14, an optical member 15, a light guide plate 16, an LED light source (light source) 17, an LED substrate 18, and a reflection sheet 19. And a biasing member 20, a first engagement pin (first engagement portion) 21, a second engagement pin (second engagement portion) 22, and a frame 24.

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-based 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 long side of the bottom plate 14a, and a short plate of the bottom plate 14a. And a pair of walls 14e and 14f provided upright on the side edge. Each of the walls 14c, 14d, 14e, and 14f is arranged so as to rise from the bottom plate 14a. As will be described later, the bottom plate 14 a of the chassis 14 is addressed to the plate surface 16 b on the back side of the light guide plate 16 with the reflection sheet 19 interposed therebetween.

The first engagement pin (first engagement portion) 21 is an elongated columnar protrusion, and is erected on the bottom plate 14a. The first engagement pin 21 is made of the same material as the chassis 14. Two first engaging pins 21 are provided in the vicinity of one wall 14f on the short side of the bottom plate 14a. These first engagement pins 21 are provided so as to be aligned along the short side direction while being spaced apart from each other. The second engagement pin (second engagement portion) 22 has the same shape as the first engagement pin, and is erected on the bottom plate 14a. Two second engaging pins 22 are provided in the vicinity of the wall 14e on the other short side facing the wall 14f. These second engagement pins are provided so as to be aligned along the short side direction while being spaced apart from each other. In the present embodiment, the first engagement pin 21 and the second engagement pin 22 face each other on the bottom plate 14a. The first engagement pin 21 and the second engagement pin 22 are used when the light guide plate 16 is positioned on the bottom plate 14 a of the chassis 14. Each of the engagement pins 21 and 22 has a shape rising from the bottom plate 14 a of the chassis 14 toward the light guide plate 16.

The light guide plate 16 is composed of two plate units 61 and 62 combined as one plate member as shown in FIGS. Each of the plate units 61 and 62 constituting the light guide plate 16 is a small light guide plate that can be manufactured by a conventional manufacturing facility, and is formed of a transparent plate member having a predetermined thickness. Each of the plate- like units 61 and 62 is manufactured from a synthetic resin material (for example, acrylic resin such as PMMA or polycarbonate) having a refractive index higher than that of air and transparent. The plate- like units 61 and 62 are both rectangular when viewed from the front side. The plate units 61 and 62 are set to the same size. These plate- like units 61 and 62 are arranged in a row with their end faces 61e and 62f butting each other. The plate units 61 and 62 are arranged such that the plate surfaces 61a and 62a are connected to each other as a single plane (so-called flush). In FIG. 3, a plate-like unit 61 is arranged on the left side (wall 14f side), and a plate-like unit 62 is arranged on the right side (wall 14e side).

The light guide plate 16 has a front plate surface 16a, a back plate surface 16b, two end surfaces 16c and 16d on the long side, and two end surfaces 16e and 16f on the short side. In the case of this embodiment, the two end surfaces 16c and 16d on the long side are light incident surfaces 16c and 16d on which light emitted from the LED light source 17 is incident, respectively. Further, the front-side plate surface 16 a becomes a light emitting surface 16 a that emits light incident from the light incident surfaces 16 c and 16 d toward the optical sheet 15 and the liquid crystal panel 11 disposed above the light guide plate 16. ing.

The front plate surface (light emitting surface) 16 a of the light guide plate 16 is composed of a front plate surface 61 a of the plate unit 61 and a front plate surface 62 a of the plate unit 62. The plate surface 16 b on the back side of the light guide plate 16 includes a plate surface 61 b on the back side of the plate unit 61 and a plate surface 62 b on the back side of the plate unit 62. In addition, one (lower) end surface 16 c on the long side of the light guide plate 16 is composed of an end surface 61 c of the plate unit 61 and an end surface 62 c of the plate unit 62, and the other on the long side of the light guide plate 16. The (upper) end surface 16 d is composed of an end surface 61 d of the plate unit 61 and an end surface 62 d of the plate unit 62. One end surface 16 e on the short side of the light guide plate 16 is composed of the end surface 62 e of the plate unit 62, and the other end surface 16 f on the short side of the light guide plate 16 is composed of the end surface 61 f of the plate unit 61.

The light guide plate 16 is accommodated in the chassis 14 with the reflection sheet 19 interposed therebetween. Within the chassis 14, the end face 16c of the light guide plate 16 faces the wall 14c, the end face 16d faces the wall 14d, the end face 16e faces the wall 14e, and the end face 16f faces the wall 14f. Yes. There is a gap between the end face 16e of the light guide plate 16 and the wall 14e, and an urging member 20 described later is accommodated in this gap. The plate surface 16 b on the back side of the light guide plate 16 faces the bottom plate 14 a of the chassis 14 with the reflection sheet 19 interposed therebetween.

In the chassis 14, a first engaged portion 121 is provided at the end of the plate unit 61 disposed on the wall 14 f side. As shown in FIG. 3, two first engaged portions 121 are provided at the end of the plate unit 61. The first engaged portion 121 has a notch shape penetrating along the plate thickness direction (Z-axis direction) of the plate unit 61. The first engaged portion 121 has a shape that is recessed from the flat end surface 61f (16f) toward the inside (the center side of the light guide plate 16). The first engaged parts 121, 121 are provided at the end of the plate-like unit 61 in a state where the first engaged parts 121, 121 are kept apart from each other. A first engagement pin is inserted into each first engaged portion 121. FIG. 6 is an enlarged plan view of the first engaging portion 21 and the first engaged portion 121.

In the chassis 14, a second engaged portion 122 is provided at the end of the plate-like unit 62 disposed on the wall 14 e side. FIG. 7 is an enlarged plan view of the second engaging portion 22 and the second engaged portion 122. As shown in FIG. 3, two second engaged portions 122 are provided at the end of the plate unit 62. The second engaged portion 122 has a notch shape penetrating along the plate thickness direction (Z-axis direction) of the plate-like unit 62. The second engaged portion 122 has a shape that is recessed from the flat end face 62e (16e) toward the inside (the center side of the light guide plate 16). The second engaged portions 122 and 122 are provided at the end of the plate-like unit 62 in a state where the second engaged portions 122 and 122 are kept apart from each other. In addition, the 2nd to-be-engaged part is set larger than the 1st to-be-engaged part mentioned above. Specifically, the length (the depth of the depression) L2 (see FIG. 7) of the second engaged portion 122 in the arrangement direction (X-axis direction) of the plate- like units 61 and 62 is the alignment direction (X-axis). It is set to be longer than the length (depth of the depression) L1 (see FIG. 6) of the first engaged portion 121 in the direction). A second engagement pin 22 is inserted into each second engaged portion 122.

As shown in FIG. 6, the inner edge portion of the first engaged portion 121 includes an inner edge portion 121c in the arrangement direction (X-axis direction) of the plate units 61 and 62, and the inner edge portion 121c for convenience of explanation. Are also divided into an inner edge portion 121a on the upper side (end surface 16d side) and an inner edge portion 121b on the lower side (end surface 16c side) than the inner edge portion 121c. The first engagement pins 21 are inserted into the first engaged portions 121 so as to contact (engage with) at least the inner edge portions 121c in the arrangement direction. The first engagement pin 21 also contacts and engages with the upper inner edge portion 121a and the lower inner edge portion 121b. Therefore, when the first locking pin 21 is engaged with the first engaged portion 121, the movement of the plate units 61 in the direction perpendicular to the arrangement direction (Y-axis direction) is restricted.

As shown in FIG. 7, the inner edge portion of the second engaged portion 122 includes an inner edge portion 122c in the arrangement direction (X-axis direction) of the plate units 61 and 62 and the inner edge portion 122c for convenience of explanation. Are also divided into an inner edge portion 122a on the upper side (end surface 16d side) and an inner edge portion 122b on the lower side (end surface 16c side) than the inner edge portion 122c. The second engagement pin 22 is inserted into the second engaged portion 122 in a state where it can move along the alignment direction. A distance D2 is provided between the second engagement pin 22 and the end surface 62e (16e) of the plate-like unit 62 so that at least the second engagement pin 22 can move along the arrangement direction. . The second engagement pins 22 are in contact with the upper inner edge portion 122a and the lower inner edge portion 122b and are engaged with each other, whereby a direction perpendicular to the arrangement direction of the plate units 61 (Y-axis direction). ) Is regulated.

In addition, on the plate surface 16 b on the back side of the light guide plate 16, patterning is performed so that a reflection portion (not shown) that reflects light in the light guide plate 16 or a scattering portion (not shown) that scatters has a predetermined in-plane distribution. Thus, the light emitted from the plate surface (light emitting surface) 16a is adjusted to have a uniform distribution in the surface.

In the case of the present embodiment, the end face 16f of the light guide plate 16 (the end face 61f of the plate unit 61) is an engagement end face 16f (61f) that engages with the first engagement pin 21. Moreover, the end surface 61c and the end surface 61d of the plate-shaped unit 61 are adjacent end surfaces 61c and 61d adjacent to the engaging end surface 16f (61f), respectively. Further, the end face 16e of the light guide plate 16 (end face 62e of the plate unit 62) is on the opposite side of the engaging end face 16f (61f) in the arrangement direction, and the opposite end face 16e (62e) to which the urging member 20 is addressed. ).

The urging member 20 has a prismatic shape elongated in the short side direction (Y-axis direction) of the light guide plate 16 and is made of a rubber body (an example of an elastic body) made of synthetic rubber. Since there is a space between the end surface (opposite surface) 16e of the light guide plate 16 and the wall 14e, the urging member 20 is accommodated in the chassis 14 so as to fill this space. The width of the urging member 20 (the width in the arrangement direction) is set to be larger than the interval between the opposite end face 16e and the wall 14e, and the urging member 20 is elastically deformed and compressed at the interval. The compressed urging member 29 comes into contact with the opposite end surface 16e and urges the plate unit 62 toward the first engagement portion 21 side. Then, the plate unit 61 is pressed against the first engaging portion 21, and the plate unit 62 is pressed against the plate unit 61.

The reflection sheet 19 is interposed between the light guide plate 16 and the bottom plate 14 a of the chassis 14, and covers the plate surface 16 b on the back side of the light guide plate 16. The reflection sheet 19 reflects the light incident on the inside of the light guide plate 16 from the end surface (light incident surface) 16c toward the front plate surface (light emitting surface) 16a side. The reflection sheet 19 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). In the case of the present embodiment, the size of the reflection sheet 19 is set to be approximately the same as the plate surface 16 b on the back side of the light guide plate 16. Note that notches 221 and 222 are provided at the respective ends on the short side of the reflection sheet 19. When viewed from the front side, the notch 221 has the same shape as the first engaged portion 121 provided in the plate-like unit 61, and the notch 222 is a second engaged matter provided in the plate-like unit 62. The shape is the same as the joint portion 221. In the chassis 14, the light guide plate 16 is placed on the reflection sheet 19 so that the engaged portions 121 and 222 overlap the notches 221 and 222. That is, the bottom plate 14 a of the chassis 14 is addressed to the plate surface 16 b on the back side of the light guide plate 16 with the reflection sheet 19 interposed therebetween. The first engagement pin 21 standing on the bottom plate 14a is inserted into the notch 221 and the second engagement pin 22 also standing on the bottom plate 14a is notched. It is inserted into the part 222.

The LED light source (light source) 17 is composed of a plurality of LED chips as 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 17 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. The LED light source 17 is not limited to such a configuration, and may have another configuration. Other configurations of the LED light source 17 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.

The LED substrate (light source substrate) 18 has a plate shape that is elongated along the long side direction (X-axis direction) of the chassis 14 as shown in FIGS. 2 to 4. The LED board 18 is accommodated in the chassis 14 in a posture in which the front plate surface 18a is along the X-axis direction and the Z-axis direction, that is, in a posture orthogonal to the plate surface 16a of the light guide plate 16. The LED substrate 18 is disposed between the wall 14c and the end surface 16c of the light guide plate 16, and between the wall 14d and the end surface 16d of the light guide plate 16, respectively. One LED substrate 18 is fixed to the wall 14c by a fixing means such as a screw (screw) (not shown) in a state where the plate surface 18b on the back side is in contact with the one wall 14c on the long side. The other LED board 18 is fixed to the wall 14d by a fixing means such as a screw (screw) not shown in the state where the plate surface 18b on the back side is in contact with the other wall 14d on the long side. .

The LED substrate 18 is mainly formed on a long (band-shaped) 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. Pattern wiring made of a metal film such as copper foil, and a reflective layer made of a white insulating film (solder resist) formed on the insulating layer so as to cover the pattern wiring. For convenience of explanation, in FIG. 2 and the like, the base material, the insulating layer, the wiring pattern, and the reflective layer in the LED substrate 18 are shown integrally.

A plurality of LED light sources 17 are surface-mounted on the front surface 18 a of the LED substrate 18. The LED light sources 17 are arranged in a line along the longitudinal direction (X-axis direction) of the LED substrate 18 on the plate surface 18a. The LED light sources 17 have the same shape and are arranged at equal intervals. The LED light sources 17 are connected to each other in series by the pattern wiring. A connector (not shown) for relaying power supplied from the outside to each LED light source 17 is mounted on the LED board 18 as well as including a terminal portion electrically connected to the end of the pattern wiring. Has been. The external shape of the LED light source 17 mounted on the plate surface 18a is a substantially rectangular parallelepiped. Various conditions such as the number of the LED light sources 17 mounted on the LED substrate 18 and the distance between the LED light sources 17 are set as appropriate.

As shown in FIG. 2 and the like, the optical member 15 has a horizontally long rectangular shape when viewed from the front side, like the liquid crystal panel 11 and the like. The optical member 15 of the present embodiment is composed of a laminate of four optical sheets 15a, 15b, 15c, and 15. These optical sheets 15a, 15b, 15c, 15 are stacked in this order from the lower side (back side) to the upper side (front side). The optical sheets 15a and 15d are each composed of a microlens sheet (diffusion sheet), and the optical sheets 15b and 15c are each composed of a lens sheet. In another embodiment, a sheet made of DBEF (Dual Brightness Enhancement Film) may be used as the optical sheet 15a. The optical member 15 is placed on the plate surface 16 a so as to cover the front plate surface (light emitting surface) 16 a of the light guide plate 16. The size of the optical member 15 (the size of each optical sheet 15a and the like) is set to be approximately the same as the size of the front surface 16a of the light guide plate 16.

The frame 24 is a frame-like (frame-like) member along each peripheral edge of the liquid crystal panel 11 and the light guide plate 16, and is made of synthetic resin or the like. The frame 24 is black and has a light shielding property. The frame 24 presses the end of the light guide plate 16 from the front side over substantially the entire circumference. The frame 24 is covered from the upper end side of each wall 14c, 14d, 14e, 14f of the chassis 14 that houses the light guide plate 16 and the like. The frame 24 is fixed to the walls 14c, 14d, 14e, and 14f of the chassis 14 by fixing means (not shown) such as screws. Note that the peripheral edge of the liquid crystal panel 11 is placed on the inner peripheral edge of the frame 24.

The liquid crystal panel 11 is attached to the chassis 14 with its peripheral edge sandwiched between the frame 24 and the above-described bezel 13 covered from the front side of the frame 24. The bezel 13 is fixed to the walls 14c, 14d, 14e, and 14f of the chassis 14 together with the frame 24 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 17 on the LED substrate 18 provided in the illumination device 12 emits light (lights up). When each LED light source 17 emits light, light enters the light guide plate 16 from the end surface (light incident surface) 16 c of the light guide plate 16. The incident light is reflected or the like by the reflection sheet 19 or the like laid on the back side of the light guide plate 16 and travels through the light guide plate 16 while being planar light from the front surface (light emitting surface) 16a. And emitted. The light emitted from the plate surface 16a passes through the optical member 15 and becomes uniform planar light, 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.

In the illumination device 12 of the present embodiment, the light guide plate 16 is formed by combining two plate- like units 61 and 62. The plate- like units 61 and 62 are arranged in the chassis 14 in a state where the end surfaces 61e and 62f are abutted with each other. A notched first engaged portion 121 is provided on an end surface (engagement end surface) 61 f of the plate-like unit 61. When the first engaged portion 121 and the first engagement pin 21 are engaged with each other, the plate unit 61 does not move in the direction in which the plate units 61 and 62 are arranged. Is positioned against. The urging member 20 is addressed to the end surface (opposite end surface) 62e of the plate unit 62, and the plate unit 62 is pressed against the first engagement pin 21 side by the urging member 20. . Then, the end surface 61e of the plate-like unit 61 and the end surface 62f of the plate-like unit 62 are pressed against each other and brought into close contact with each other. Therefore, in the illuminating device 12 of the present embodiment, the adhesion between the end surfaces 61e and 62f of the adjacent plate units 61 and 62 is enhanced by the biasing member 20. When the adhesion between the end surfaces 61e and 62f is enhanced, light is prevented from leaking between the end surfaces 61e and 62f, and the end surfaces 61e and 62f are included in the planar light generated from the lighting device 12. It is possible to suppress the occurrence of luminance unevenness that shines in a stripe shape along the line. The illuminating device 12 of this embodiment is suitable for large-sized television receiver TV (liquid crystal display device 10), such as 100 type, for example.

In the illumination device 12 of the present embodiment, the occurrence of the luminance unevenness is further improved by appropriately setting the configuration of the optical member 15 and the pattern-like reflecting portion formed on the plate surface 16b of the light guide plate 16. It is definitely suppressed.

In the illumination device 12 of the present embodiment, the plate unit 61 is also positioned in the direction perpendicular to the arrangement direction by engaging with the first engagement pins 21. Therefore, the distance between each LED light source 17 on the LED board 18 arranged on the wall 14c side and the end face (adjacent end face) 16c of the plate unit 61, and each on the LED board 18 arranged on the wall 14d side. The distance between the LED light source 17 and the end surface (adjacent end surface) 16d of the plate unit 61 is controlled within a desired range. As a result, contact between the end surfaces 16c and 16d of the light guide plate 16 (end surfaces 61c and 61d of the plate unit 61) and the LED light source 17 can be prevented. Further, the first engaged portion 121 is not an end portion where the light incident surfaces 16c and 16d are arranged, but an end portion (engagement end surface 16f (61f) of the plate-like unit 61 arranged in the arrangement direction. The end portion including Therefore, the light emitted from the LED light source 17 is suppressed from being blocked by the first engagement pin 21 inserted into the first engaged portion 121.

Further, in the lighting device 12 of the present embodiment, the chassis 14 is provided with a wall (wall portion) 14e that is opposed to the opposite end surface 16e (62e) while being spaced apart. The urging member 20 is housed in the interval and is made of an elastic body that elastically urges the light guide plate 16 toward the first engagement pin 21. Therefore, when the light guide plate 16 receives heat generated from the LED light source 17 or the like and thermally expands (particularly, in the arrangement direction), the biasing member 20 elastically deforms and contracts, but the biasing member 20 Since the opposite end surface 16e of the light guide plate 16 is constantly urged toward the first engaging pin 21, the adhesion between the end surface 61e of the plate unit 61 and the end surface 62f of the plate unit 62 is maintained. On the other hand, when the light guide plate 16 that has been thermally expanded is cooled and thermally contracted (particularly, in the arrangement direction), the biasing member 20 is elastically deformed and expands (restores). Since the member 20 constantly urges the opposite end surface 16e of the light guide plate 16 toward the first engagement pin 21 side, the adhesion between the end surface 61e of the plate unit 61 and the end surface 62f of the plate unit 62 is maintained. Therefore, when the urging member 20 is made of an elastic body, the size of each of the plate units 61 and 62 (the length of the light guide plate 16 in the arrangement direction) changes even if they change due to thermal expansion or contraction. The adhesion between the end surfaces 61e and 62f of the plate units 61 and 62 can be maintained.

Further, in the illumination device 12 of the present embodiment, a second engaged portion 122 is formed by cutting out a part of the opposite end surface 16e on the opposite end surface 16e of the light guide plate 16 and extending along the arrangement direction. Is provided. Further, the lighting device 12 is inserted into the second engaged portion 122 and engaged with the inner edge portions 122a and 122b of the second engaged portion 122 disposed in a direction perpendicular to the arrangement direction, A second engagement pin (second engagement portion) 22 provided on the chassis 14 is provided. The plate-like unit 62 constituting the light guide plate 16 is positioned so as not to move in the perpendicular direction when the second engaged portion 122 and the second engagement pin 22 are engaged. Therefore, the distance between each LED light source 17 on the LED board 18 arranged on the wall 14c side and the end surface 62c of the plate unit 62, and each LED light source 17 on the LED board 18 arranged on the wall 14d side The distance between the end faces 62d of the plate unit 62 is controlled within a desired range. As a result, contact between the end surfaces 16c and 16d and the LED light source 17 can be prevented. As a result, contact between the end surfaces 16c and 16d of the light guide plate 16 (end surfaces 62c and 62d of the plate-like unit 62) and the LED light source 17 can be prevented. The second engaged portion 122 is not the end where the light incident surfaces 16c and 16d are arranged, but the end (opposite end surface 16e (62e) of the plate unit 62 arranged in the arrangement direction. Including the end). Therefore, the light emitted from the LED light source 17 is prevented from being blocked by the second engagement pin 22 inserted into the second engaged portion 122.

<Embodiment 2>
Hereinafter, Embodiment 2 of the present invention will be described with reference to FIGS. 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. 8 is a plan view of the illumination device 12A according to the second embodiment, and FIG. 9 is a cross-sectional view taken along the long side direction of the liquid crystal display device 10A. For convenience of explanation, FIG. 8 shows the lighting device 12A in a state where the optical sheet 15 and the frame 24 (see Embodiment 1) are removed. FIG. 9 is a cross-sectional view of the liquid crystal display device 10 cut at a portion corresponding to the line CC ′ of 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 illuminating device 12A included in the liquid crystal display device 10A of the present embodiment is different from that of the first embodiment in the configuration of the urging member 20A.

The light guide plate 16A of this embodiment is composed of a single plate-like member in which the plate-like unit 61A and the plate-like unit 62A are arranged in a state where the end surfaces 61Ae and 62Af are in contact with each other. The front plate surface (light emitting surface) 16a of the light guide plate 16A is composed of a front plate surface 61Aa of the plate unit 61A and a front plate surface 62Aa of the plate unit 62A. Further, the plate surface 16b on the back side of the light guide plate 16A includes a plate surface 61Ab on the back side of the plate unit 61A and a plate surface 62Ab on the back side of the plate unit 62A. One end face (light incident face) 16c on the long side of the light guide plate 16A is composed of an end face 61Ac of the plate unit 61A and an end face 62Ac of the plate unit 62A. The other end face (light incident face) 16d on the long side of the light guide plate 16A is composed of an end face 61Ad of the plate unit 61A and an end face 62Ad of the plate unit 62A. Further, the engaging end surface 16f of the light guide plate 16A is composed of the end surface 61Af of the plate unit 61A, and the opposite end surface 16e of the light guide plate 16A is composed of the end surface 62Ae of the plate unit 62A.

The urging member 20A is made of a metal or resin spring body wound spirally. The urging member 20A is a kind of elastic body, like the rubber body of the first embodiment. The urging member 20A is accommodated in a gap (interval) between the end surface (opposite end surface) 16e of the light guide plate 16A and the wall 14e in an elastically compressed state. In the case of the present embodiment, a plurality (three) of urging members 20A are provided in the gap (interval). The urging members 20A are arranged in a line along the end surface (opposite end surface) 16e of the light guide plate 16A in a state where the urging members 20A are kept apart from each other. As in the present embodiment, instead of the urging member 20 made of a rubber body according to the first embodiment, an urging member 20A made of a spring body may be used.

The basic configuration of the plate unit 61A is the same as that of the plate unit 61 of the first embodiment. A notched third engaged portion 123 is provided on each of the end surface 62Ac and the end surface 62Ad of the plate-like unit 61A. A third engagement pin (third engagement portion) 23 is inserted into each third engagement portion 123. FIG. 10 is an enlarged plan view of the third engaging portion 23 and the third engaged portion 123, and FIG. 11 is an enlarged plan view of the other third engaging portion 23 and the other third engaged portion 123. FIG. FIG. 10 shows a third engaged portion 123 provided at the end of the plate-like unit 62A disposed on the wall 14d side, and a third engagement inserted into the third engaged portion 123. The pins 23 are shown engaged with each other. On the other hand, in FIG. 11, the third engaged portion 123 provided at the end of the plate unit 62A disposed on the wall 14c side, and the third engaged portion 123 are inserted. A state where the third engaging pins 23 are engaged with each other is shown. The third engagement pin 23 has the same shape as the first engagement pin 21 and is erected on the bottom plate 14 a of the chassis 14. In the case of the present embodiment, one third engagement pin 23 is provided on each of the wall 14c side and the wall 14d side. The third engagement pins 23 face each other on the bottom plate 14a via the plate-like unit 62A.

As shown in FIG. 10, the third engaged portion 123 disposed on the end surface 62Ad side is disposed on the engagement end surface 16f side of the light guide plate 16 in the arrangement direction of the plate- like units 61A and 62A for convenience of explanation. The inner edge portion 123a, the inner edge portion 123b disposed on the opposite end face 16e side of the light guide plate 16 in the arrangement direction, and a portion sandwiched between the inner edge portions 123a and 123b, and with respect to the arrangement direction. And the inner edge portion 123c in the direction that intersects perpendicularly (Y-axis direction). The third engagement pins 23 are in contact with and engaged with the inner edge portion 123c in the perpendicular direction. Further, a space D12 is provided between the third engagement pin 23 and the inner edge portion 123b, and the third engagement pin 23 is set to be movable along the arrangement direction (X-axis direction). Has been.

As shown in FIG. 11, the other third engaged portion 123 arranged on the end surface 62Ac side is arranged on the engagement end surface 16f side of the light guide plate 16 in the arrangement direction of the plate units 61A and 62A for convenience of explanation. An inner edge portion 123a arranged on the opposite end face 16e side of the light guide plate 16 in the arrangement direction, and a portion sandwiched between these inner edge portions 123a and 123b in the arrangement direction. And an inner edge portion 123c in a direction (Y-axis direction) intersecting perpendicularly with respect to each other. The third engagement pins 23 are in contact with and engaged with the inner edge portion 123c in the perpendicular direction. In addition, a space D22 is provided between the third engagement pin 23 and the inner edge portion 123b, and the third engagement pin 23 is set to be movable along the arrangement direction (X-axis direction). Has been. In the present embodiment, the interval D12 and the interval D22 described above are set to be the same.

In the illuminating device 12A of the present embodiment, the plate unit 62A constituting the light guide plate 16A is configured such that the third engaged portion 123 and the third engagement pin 23 are engaged with each other, whereby the plate unit 62A is Positioning is performed in a direction (Y-axis direction) perpendicular to the arrangement direction. As described above, the third engaged portion 123 and the third engagement pin 23 for positioning the plate-like unit 62A are arranged on the light incident surfaces 16c and 16d side, not on the opposite end surface 16e side of the light guide plate 16, respectively. It may be configured to.

<Embodiment 3>
Next, Embodiment 3 of the present invention will be described with reference to FIG. FIG. 12 is a plan view of a lighting device 12B according to the third embodiment. For convenience of explanation, FIG. 12 shows the illumination device 12B in a state where the optical sheet 15 and the frame 24 (see Embodiment 1) are removed. The basic configuration of the illumination device 12B of the present embodiment is the same as that of the first embodiment. However, in the case of the present embodiment, the light guide plate 16B is different from that of the first embodiment and is formed by combining three plate units 61B, 62B, and 63B.

As shown in FIG. 12, a plate unit 61B is arranged on the wall 14f side, and a plate unit 62B is arranged on the wall 14e side. A plate unit 63B is disposed between the plate units 61B and 62B. These plate- like units 61B, 62B, and 63B are arranged in a line in a state where the end faces thereof are abutted with each other. The end surface 61Be of the plate unit 61B and the end surface 63Bf of the plate unit 63B are abutted with each other, and the end surface 63Be of the plate unit 63B and the end surface 62Bf of the plate unit 62B are abutted with each other. The light guide plate 16B of the present embodiment is composed of a single plate-like member formed by combining these plate- like units 61B, 62B, and 63B.

The front plate surface (light emitting surface) 16a of the light guide plate 16B includes a front plate surface 61Ba of the plate unit 61B, a front plate surface 63Ba of the plate unit 63B, and a front plate surface 62Ba of the plate unit 62B. It consists of. The back plate surface 16b of the light guide plate 16B includes a back plate surface 61Bb of the plate unit 61B, a back plate surface 63Bb of the plate unit 63B, and a back plate surface 62Bb of the plate unit 62B. Is done. One end face (light incident face) 16c on the long side of the light guide plate 16B is composed of an end face 61Bc of the plate unit 61B, an end face 63Bc of the plate unit 63B, and an end face 62Bc of the plate unit 62B. The The other end surface (light incident surface) 16d on the long side of the light guide plate 16B is composed of an end surface 61Bd of the plate unit 61B, an end surface 63Bd of the plate unit 63B, and an end surface 62Bd of the plate unit 62B. The The engaging end surface 16f of the light guide plate 16B is composed of the end surface 61Bf of the plate unit 61B, and the opposite end surface 16e of the light guide plate 16B is composed of the end surface 62Be of the plate unit 62B.

A first engaged portion 121 formed by cutting out a part of the engagement end surface 16f of the plate-like unit 61B is provided. The first engaging pin 21 is inserted into the first engaged portion 121 as in the first embodiment. An urging member 20A made of a spring body is addressed to the opposite end surface 16e of the plate unit 62B. The urging member 20A is accommodated in a gap (interval) between the opposite end surface 16e of the light guide plate 16B and the wall 14e. Further, a pair of third engaged portions 123 are provided in the plate unit 62B and the plate unit 63B, respectively. Both the plate unit 62B and the plate unit 63B intersect perpendicularly to the arrangement direction of the plate units 61B, 63B, 63B due to the engagement of the third engaged portion 123 and the third engagement pin 23. Positioning is performed in the (Y-axis direction).

As in the lighting device 12B of the present embodiment, one plate-like member formed by combining three plate- like units 61B, 62B, 63B may be used as the light guide plate 16B. In the illuminating device 12B of the present embodiment, the urging member 20A urges the light guide plate 16B toward the first engagement pin 21 side, so that the end surfaces 61Be and 63Bf of the adjacent plate units 61B and 63B are adjacent to each other. Is secured, and the adhesion between the end faces 63Be and 62Bf of the adjacent plate units 63B and 62B is secured.

<Embodiment 4>
Next, Embodiment 4 of the present invention will be described with reference to FIG. FIG. 13 is a plan view of a lighting device 12C according to the fourth embodiment. FIG. 13 shows the lighting device 12C in a state where the optical sheet 15 and the frame 24 (see Embodiment 1) are removed for convenience of explanation. The basic configuration of the illuminating device 12C of the present embodiment is the same as that of the first embodiment. However, in the case of the present embodiment, the first engaged portion 121 provided on the plate-like unit 61C constituting the light guide plate 16C is not on the end face 16f side of the light guide plate 16C, but on the plate-like unit 61C adjacent to the end face 16f. Are provided on the end faces 61Cd and 61Cc, respectively.

The light guide plate 16C of the present embodiment is composed of a single plate-like member in which the plate-like unit 61C and the plate-like unit 62C are arranged in a state where the end surfaces 61Ce and 62Cf of each other face each other. The front-side plate surface (light emitting surface) 16a of the light guide plate 16C includes a front-side plate surface 61Ca of the plate-like unit 61C and a front-side plate surface 62Ca of the plate-like unit 62C. Further, the back plate surface 16b of the light guide plate 16C includes a back plate surface 61Cb of the plate unit 61C and a back plate surface 62Cb of the plate unit 62C. Further, one end face (light incident face) 16c on the long side of the light guide plate 16C is composed of an end face 61Cc of the plate unit 61C and an end face 62Cc of the plate unit 62C. The other end surface (light incident surface) 16d on the long side of the light guide plate 16C is composed of an end surface 61Cd of the plate unit 61C and an end surface 62Cd of the plate unit 62C. The end face 16f of the light guide plate 16C is composed of the end face 61Cf of the plate unit 61C, and the opposite end face 16e of the light guide plate 16C on the opposite side of the end face 16f is composed of the end face 62Ce of the plate unit 62C. The end surface 61Cd of the plate-like unit 61C is an adjacent end surface 61Cd that engages with the first engagement pin 21, and the end surface 61Cc is also an adjacent end surface 61Cc that engages with the other first engagement pin 21. ing.

In the plate-like unit 61C, the first engagement pin 21 is engaged with the two first engaged portions 121, respectively, so that the plate-like unit 61C intersects perpendicularly to the arrangement direction of the plate-like units 61C and 62C ( In the Y-axis direction), positioning is performed. In the case of the present embodiment, the plate-like unit 61C is arranged in the alignment direction by the engagement between the inner edge portion of the first engaged portion 121 on the opposite end face 16e side and the first engagement pin 21. Positioning is also performed in the (X-axis direction).

In the case of the present embodiment, the urging member 20B is made of a rubber body as in the first embodiment. However, a light reflective coating film (white coating film) is formed on the surface of the urging member 20B. The urging member 20B is accommodated in a gap (interval) between the end surface (opposite end surface) 16e of the light guide plate 16C and the wall 14e. The biasing member 20B biases toward the first engagement pin 21 side. When the urging member 20B urges and presses the plate unit 62C against the plate unit 61C, the end surfaces 61Ce and 62Cf of the adjacent plate units 61C are in close contact with each other without a gap. The plate-like unit 62C is positioned in the direction that intersects perpendicularly (Y-axis direction) by the engagement of the third engaged portion 123 and the third engagement pin 23.

Like the lighting device 12C of the present embodiment, the first engaging pin 21 and the first engaged portion 121 are engaged at the end portions on the adjacent end surfaces 61Cc and 61Cd side of the plate-like unit 61C. Also good. Further, like the lighting device 12C of the present embodiment, a light-reflective coating film 20B is applied to the surface of the urging member 20B, and the urging member 20B reflects light leaking from the light guide plate 16C and the like. You may comprise so that it may return to the light-guide plate 16C side again. In other embodiments, the urging member itself may be composed of a rubber body (white rubber body) having excellent light reflectivity.

<Embodiment 5>
Next, Embodiment 5 of the present invention will be described with reference to FIG. FIG. 14 is a plan view of a lighting device 12D according to the fifth embodiment. FIG. 14 shows the illumination device 12D in a state where the optical sheet 15 and the frame 24 (see Embodiment 1) are removed for convenience of explanation. Although the illuminating device 12D of the present embodiment has a horizontally long rectangular shape when viewed from the plane as in the first embodiment, the LED light source 17 is arranged along the short side of the light guide plate 16D. That is, in the illumination device 12 of the present embodiment, the LED substrate 18 on which the LED light source 17 is mounted is fixed to the walls 14e and 14f of the chassis 14, respectively. The illuminating device 12D of the present embodiment is generally configured such that the aspect ratio (the ratio of the long side direction and the short side direction) in the illuminating device 12 of Embodiment 1 is changed.

The light guide plate 16D of the present embodiment is composed of a single plate-like member in which the two plate- like units 61D and 62D are arranged in a row with the end faces 61Dd and 62Dc facing each other. In the case of this embodiment, the arrangement direction of the plate units 61D and 62D is set to the short side direction (Y-axis direction) of the chassis 14. The front-side plate surface (light emitting surface) 16a of the light guide plate 16D includes a front-side plate surface 61Da of the plate-like unit 61D and a front-side plate surface 62Da of the plate-like unit 62D. Further, the plate surface 16b on the back side of the light guide plate 16D includes a plate surface 61Db on the back side of the plate unit 61D and a plate surface 62Db on the back side of the plate unit 62D. Further, one end face (light incident face) 16e on the short side of the light guide plate 16D is composed of an end face 61De of the plate unit 61D and an end face 62De of the plate unit 62D. The other end surface (light incident surface) 16f on the short side of the light guide plate 16D is composed of an end surface 61Df of the plate unit 61D and an end surface 62Df of the plate unit 62D. The engaging end surface 16c of the light guide plate 16D is composed of the end surface 61Dc of the plate unit 61D, and the opposite end surface 16d of the light guide plate 16D is composed of the end surface 62Dd of the plate unit 62D.

Two notched first engaged portions 121 are provided on the end surface 61Dc (engagement end surface 16c) of the plate unit 61D. A first engagement pin (first engagement portion) 21 is inserted into the first engaged portion 121, and the plate-like unit 61 </ b> D includes the first engaged portion 121 and the first engagement pin 21. By being engaged, positioning is performed in the alignment direction. In the case of the present embodiment, the plate-like unit 61D is configured such that the first engaged portion 121 engages with the first engagement pins 21 so that the plate unit 61D intersects perpendicularly with respect to the arrangement direction (X-axis direction). Is also positioned. One notch-shaped second engaged portion 122 is provided on the end surface 62Dd (opposite end surface 16d) of the plate unit 62D. A second engagement pin (second engagement portion) 22 is inserted into the second engaged portion 122, and the plate-like unit 62 </ b> D has the second engaged portion 122 and the second engagement pin 22. By engaging, it is positioned in the perpendicular direction (X-axis direction). Further, the second engagement pin 22 is set so as to be able to move in the second engaged portion 122 along the alignment direction.

There is a gap (interval) between the opposite end surface 16d of the light guide plate 16D and the wall 14d, and an urging member 20A made of a spring body is accommodated in the gap (interval). In the case of this embodiment, two urging members 20A are accommodated in the gap (interval). The urging member 20A is addressed to the opposite end surface 16d, and elastically urges the plate unit 62D toward the first engagement pin 21 side.

In the illuminating device 12D of the present embodiment, since the urging member 20A presses the plate unit 61D toward the first engagement pin 21 side, the end surface 61Dd of the plate unit 61D and the plate unit 62D that are in contact with each other are pressed. The end face 62Dc is in close contact with each other. In addition, since the illuminating device 12D of this embodiment is used in the state where the short side direction is arranged along the vertical direction, the plate-like unit 61D arranged on the upper side is arranged on the lower side. In this state, the plate units 62D are stacked. Accordingly, the plate unit 62D disposed on the upper side is in close contact with the plate unit 61D disposed on the lower side by the weight (self-weight) of the plate unit 62D itself. That is, in the lighting device 12D of the present embodiment, the adhesion between the end surfaces 61Dd and 62Dc of the adjacent plate units 61D and 62D is enhanced by the biasing member 20A, and the weight of the plate unit 62D itself is used. Thus, the adhesion between the end faces 61Dd and 62Dc is enhanced. As a result, the illumination device 12D of the present embodiment has high adhesion between the end faces 61Dd and 62Dc, and the occurrence of uneven brightness is suppressed.

<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 the first embodiment, an elastic body made of a rubber body is used as the urging member 20, but in other embodiments, other members that are not elastically deformed may be used as the urging member. . However, since the plate- like units 61 and 62 used for the light guide plate 16 generally change in size (length) due to thermal expansion or contraction, the elastic body can cope with such changes. It is preferable to use a biasing member made of (rubber body, spring body, etc.).

(2) In the first embodiment, the LED light sources 17 are arranged on the two walls 14c and 14d on the long side of the chassis 14, respectively. In another embodiment, for example, the LED light source 17 may be arranged on the side of the walls 14e and 14f on the short side.

(3) In the first embodiment, an LED light source is used as the light source. However, in other embodiments, other light sources (for example, cold cathode tubes) may be used.

(4) In the first embodiment, the first engagement pin 21 is erected on the bottom plate 14a of the chassis 14, but in another embodiment, for example, a first engagement pin (first engagement portion). 21 may be in a state of being attached along the wall 14f of the chassis 14 and provided integrally with the wall 14f.

(5) In the first embodiment, the LED substrate 18 on which the LED light source 17 is mounted is directly fixed to the walls 14c and 14d. In other embodiments, heat conduction such as aluminum is performed. The structure fixed to the chassis 14 in the state in which the LED board 18 was attached to the support member (heat radiating member) which consists of material excellent in property may be sufficient.

(6) The light reflectivity may be improved by applying a light reflective paint to the surface of the biasing member used in the first embodiment. *

(7) In the first embodiment, the first engagement pin 21 and the second engagement pin 22 have a columnar shape (cylindrical shape) with a circular cross-sectional shape (a shape seen from the front side). In other embodiment, it is not restricted to this, For example, you may be other columnar things, such as prismatic shape and a triangular prism shape, and there is no restriction | limiting in particular.

(8) In Embodiment 4 described above, the light-reflective coating is applied to the surface of the urging member made of a rubber body. In other embodiments, for example, the spring used in Embodiment 2 or the like. A light reflective coating film may be applied to the surface of the urging member made of a body.

(9) In the first embodiment, the television receiver TV is exemplified as the display device. However, in other embodiments, the liquid crystal display device may be used for a mobile phone, a portable information terminal, and the like.

(10) In the first embodiment, the color filters of the color filter included in the liquid crystal panel 11 are exemplified as having three colors R, G, and B. In other embodiments, the color sections are set to four or more colors. Also good. In another embodiment, a liquid crystal display device that performs monochrome display may be used.

(11) Although the TFT is used as the switching element of the liquid crystal display device in the first embodiment, a switching element other than the TFT (for example, a thin film diode (TFD)) may be used in other embodiments.

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, 15 ... Optical member, 16 ... Light guide plate, 16a ... Front side Plate surface (light emitting surface), 16b ... back plate surface, 16c, 16d ... light incident surface, 61, 62 ... plate unit, 16f ... engagement end surface, 16e ... opposite end surface, 17 ... LED light source (light source) , 18 ... LED board (light source board), 19 ... reflection sheet, 20 ... biasing member, 21 ... first engagement pin (first engagement part), 22 ... second engagement pin (second engagement part) , 23 ... third engagement pin (third engagement portion), 24 ... frame, 121 ... first engaged portion, 122 ... second engaged portion, 123 ... third engaged portion, TV ... television Receiver

Claims (11)

1. A light source;
   A plate-like member in which a plurality of plate-like units are arranged in a state in which their end faces are in contact with each other, comprising a light incident surface on which light from the light source is made of one end surface of the plate-like member, and A light guide plate having a light emitting surface that is composed of a front plate surface of the plate-like member and emits light incident from the light incident surface from the front plate surface;
   A chassis disposed on the back side of the light guide plate;
   An engagement end face that is one end face of the light guide plate that is provided in the chassis and is arranged in the arrangement direction of the plate-like units, or an end face of the plate-like unit including the engagement end face, and the engagement end face A first engagement portion that engages with an adjacent end face adjacent to
   And a biasing member that is directed to the opposite end surface of the light guide plate on the opposite side of the engagement end surface and biases the light guide plate toward the first engagement portion.
2. The first engagement portion is inserted into the engagement end surface or the adjacent end surface, and a notched first engagement portion that engages with the first engagement portion along the alignment direction is provided. The lighting device according to claim 1.
3. A wall portion is provided on the chassis and is opposed to the opposite end surface in a state of being spaced from the opposite end surface.
   The lighting device according to claim 1, wherein the urging member is made of an elastic body that is accommodated in the interval and elastically urges the light guide plate toward the first engagement portion side. .
4. A second engaged portion formed by cutting out a part of the opposite end surface and extending along the alignment direction;
   A second engagement provided in the chassis, which is inserted into the second engaged portion and engages with an inner edge portion of the second engaged portion arranged in a direction perpendicular to the arrangement direction. The lighting device according to any one of claims 1 to 3, further comprising a unit.
5. 2. A pair of third engaging portions provided on the chassis that face each other via the plate-like unit in a direction perpendicular to the arrangement direction and engage with an end surface of the plate-like unit, respectively. The illuminating device according to any one of claims 1 to 4.
6. The lighting device according to claim 5, wherein a notched third engaged portion into which the third engaging portion is inserted is provided on an end surface of the plate-like unit.
7. The lighting device according to any one of claims 1 to 6, wherein the urging member has a surface coated with a light-reflective coating.
8. The illumination device according to any one of claims 1 to 7, wherein the light source is an LED light source.
9. A display device comprising: the lighting device according to any one of claims 1 to 8; and a display panel that performs display using light from the lighting device.
10. The display device according to claim 9, wherein the display panel is a liquid crystal panel in which liquid crystal is sealed between a pair of substrates.
11. A television receiver comprising the display device according to claim 9 or 10.

Images