WO2012165318A1

WO2012165318A1 - Illuminating apparatus, display apparatus, and television receiver

Info

Publication number: WO2012165318A1
Application number: PCT/JP2012/063446
Authority: WO
Inventors: 寺島　健太郎; 井上　裕; 啓太朗松井
Original assignee: シャープ株式会社
Priority date: 2011-06-01
Filing date: 2012-05-25
Publication date: 2012-12-06

Abstract

An illuminating apparatus (12) of the present invention is provided with: a light source (16); a light guide plate (19) that has a first end surface (19c), which faces the light source (16) and has light inputted thereto, said light having been emitted from the light source (16), a second end surface (19d), which is disposed parallel to the first end surface (19c), and a light output surface (19a), which has the light outputted therefrom, said light having been inputted thereto from the first end surface (19c); a housing member (14) that has a bottom (14a), which faces the plate surface (19b) of the light guide plate (19), a first wall (14c), which faces the first end surface (19c) and rises from the bottom (14a), and a second wall (14d), which faces the second end surface (19d) and rises from the bottom (14a); a light source substrate (17), which has the light source (16) mounted thereon, and is disposed between the first end surface (19c) and the first wall (14c) such that the light source (16) faces the first end surface (19c); an interposing portion (18), which is provided between the light source substrate (17) and the first end surface (19c); and an elastic member (22), which is applied between the second wall (14d) and the second end surface (19d).

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, as shown in Patent Document 1, a device including a light guide plate and an LED light source arranged so as to face an end surface of the light guide plate is known. 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.

A gap (clearance) is intentionally provided between the LED light source and the light incident surface as shown in Patent Document 1. Considering only the utilization efficiency (incidence efficiency) of light emitted from the LED light source, it is preferable that there is no gap between the LED light source and the light incident surface. However, since the size of the light guide plate changes due to thermal expansion or the like, if the light incident surface of the light guide plate is in contact with the LED light source, the LED light source may be pressed and destroyed by the light incident surface. . Therefore, the gap is provided between the LED light source and the light incident surface as described above.

Note that the size of the gap is preferably kept constant. This is because, when the distance between the LED light source and the light incident surface changes, the ratio (incidence efficiency) of the light incident on the light incident surface among the light emitted from the LED light source changes. For example, when the interval is larger than a predetermined value, the light incident on the light incident surface is reduced, and the luminance of the light emitted from the lighting device is lowered.

Patent Document 1 discloses an illumination device in which a substantially rectangular light guide plate is positioned in a state surrounded by a side wall (frame member). Convex protrusions protruding outward are provided on both side ends of the light guide plate. Moreover, the recessed part is provided in the inner surface side of the said side wall facing the said projection part. The recess is filled with an elastic member made of a rubber material or the like. The light guide plate is positioned in the side wall in a state where the protrusion is fitted in the recess. A gap (clearance) is also provided between the end face of the light guide plate arranged in parallel with the light incident surface and the side wall.

JP 2007-31175 A

(Problems to be solved by the invention)
However, when the illumination device described in Patent Document 1 receives vibration from the outside or the like, the light guide plate moves along the optical axis direction of the LED light source, and the distance between the light incident surface of the light guide plate and the LED light source changes. End up. When the interval changes, the luminance of light emitted from the lighting device also changes, which is a problem. For example, when the lighting device is used with its orientation changed, the luminance may change depending on the orientation.

Also, as shown in Patent Document 1, if protrusions are provided on both ends of the light guide plate, light leaks from the vicinity of the protrusions, which is a problem. In addition, if such protrusions are provided on both side ends of the light guide plate, a portion such as a wall (so-called frame region) surrounding the light guide plate becomes thick, which is a problem.

An object of the present invention is to provide a technique for suppressing a change in luminance of a lighting device based on expansion and contraction and vibration of a light guide plate.

(Means for solving problems)
The illuminating device according to the present invention is a light source and a light guide plate that guides light from the light source, and is a first end surface of the light guide plate that faces the light source and receives light from the light source. An end face, a second end face that is one end face of the light guide plate and is arranged in parallel to the first end face, and a light exit that emits light incident from the first end face that is one plate face of the light guide plate A light guide plate having a surface; a bottom facing the plate surface of the light guide plate; a first wall facing the first end surface and rising from the bottom; and a second wall facing the second end surface and rising from the bottom. A housing member having two walls, a light source substrate that is mounted between the first end surface and the first wall so that the light source is mounted and the light source faces the first end surface; An intervening portion interposed between the light source substrate and the first end surface; the second wall; And a resilient member that is filled between the second end surface. The said illuminating device can suppress the brightness | luminance change based on the expansion-contraction and vibration of a light-guide plate.

In the lighting device, the elastic member is preferably made of a rubber material. When the elastic member is made of a rubber material, it is easy to process the elastic member into a predetermined shape.

In the lighting device, the elastic member is formed between a pair of sandwiching portions that sandwich the end portion of the light guide plate including the second end surface from the front side and the back side, and the end of the light guide plate It is preferable to have a recess into which the part is inserted. When the elastic member has such a configuration, it can be attached to the end of the light guide plate. When the light guide plate is accommodated in the accommodating member while the elastic member is attached to the end portion on the second end face side, workability is improved. When the end portion on the first end face side of the light guide plate is first put in a predetermined position of the housing member, and then the end portion on the second end face side is put in the predetermined position of the housing member, the elastic member passes through the second wall. The light guide plate is guided into the housing member. Moreover, when an elastic member is provided with the said structure, it is suppressed that it shifts | deviates by a vibration etc. to the direction along the 2nd end surface (and 1st end surface) of a light-guide plate.

In the illuminating device, it is preferable that the elastic member is chamfered along the direction in which the second end surface extends at an end portion on the side in contact with the second wall. The elastic member is chamfered along the direction in which the second end surface extends in order to reduce the portion in contact with the second wall. Thus, when the elastic member is chamfered, the light guide plate is easily accommodated in the accommodating member.

In the lighting device, the elastic member preferably exhibits white. When the elastic member is white, light that is about to be emitted from the second end surface of the light guide plate hits the elastic member and is reflected. Then, the light is returned into the light guide plate and can be used as light emitted from the light exit surface.

In the illumination device, it is preferable that a reflective layer is interposed between the elastic member and the second end surface. The reflection layer may reflect light that is about to be emitted outside from the second end face of the light guide plate and return the light into the light guide plate.

In the illumination device, the interposition part may be a screw for fixing the light source substrate to the second wall.

In the illumination device, the interposition part may be a connector that is mounted on the light source substrate and relays power supplied to each light source.

In the illumination device, it is preferable that the interposition part exhibits white. When the interposition part exhibits white color, it is excellent in light reflectivity, so that the luminance near the interposition part is suppressed from decreasing.

A 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 is a liquid crystal panel using liquid crystal.

The television receiver which concerns on this invention is provided with the said display apparatus.

(The invention's effect)
ADVANTAGE OF THE INVENTION According to this invention, the technique which suppresses the change of the brightness | luminance of the illuminating device based on the expansion-contraction and vibration of a light-guide plate 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 Sectional drawing which shows the cross-sectional structure along the short side direction of a liquid crystal display device Top view of lighting device Sectional drawing of the liquid crystal display device which concerns on Embodiment 2. FIG. Sectional drawing of the liquid crystal display device which concerns on Embodiment 3. FIG. Explanatory drawing which represented typically the process of accommodating a light-guide plate in a chassis in the state in which the elastic member was attached to the edge part. Sectional drawing of the liquid crystal display device which concerns on Embodiment 4. FIG.

<Embodiment 1>
Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 4. 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 drawing, 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 direction).

FIG. 2 is an exploded perspective view showing a schematic configuration of the liquid crystal display device 10. FIG. 3 is a cross-sectional view showing a cross-sectional configuration along the short side direction of the liquid crystal display device 10, and FIG. 4 is a plan view of the illumination device 12. 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 (housing member) 14, an optical sheet 15, an LED light source (light source) 16, an LED substrate (light source substrate) 17, A connector (intervening portion) 18, a light guide plate 19, a reflection sheet 20, a frame 21, and an elastic member 22 are provided.

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 14a which is a horizontally long rectangle when viewed from the front side, and a pair of walls (first walls) 14c and walls (first 2 walls) 14d and a pair of

walls

14e, 14f standing on the edge of the bottom 14a on the short side. Each of the

walls

14c, 14d, 14e, and 14f is arranged so as to rise from the bottom 14a.

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 bottom 14a.

The LED light source 16 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 16 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 16 is not limited to such a configuration, and may have another configuration. Other configurations of the LED light source 16 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 4, the LED substrate 17 has a plate shape that is elongated along the long side direction (X-axis direction) of the chassis 14. The LED board 17 is housed in the chassis 14 in a posture in which the front plate surface 17a is along the X-axis direction and the Z-axis direction, that is, in a posture orthogonal to the plate surface 19a of the light guide plate 19. The LED substrate 17 is disposed between the wall 14 c and the end surface 19 c of the light guide plate 19. The LED board 17 is fixed to the wall 14c by a fixing means such as a screw (screw) (not shown) in a state where the plate surface 17b on the back side is in contact with the one wall 14c on the long side.

The LED substrate 17 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. 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. 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 17 are shown integrally.

A plurality of LED light sources 16 are surface-mounted on the front surface 17 a of the LED substrate 17. The LED light sources 16 are arranged in a line along the longitudinal direction (X-axis direction) of the LED substrate 17 on the plate surface 17a. The LED light sources 16 have the same shape and are arranged at equal intervals. The LED light sources 16 are connected in series with each other by the wiring pattern. Note that an anode side (+ side) end of the wiring pattern is disposed on one end side of the LED substrate 17, and a cathode of the wiring pattern is disposed on the other end side of the LED substrate 17. The end of the side (-side) is arranged.

The external shape of the LED light source 16 mounted on the plate surface 17a is a substantially rectangular parallelepiped. Various conditions such as the number of LED light sources 16 mounted on the LED substrate 17 and the distance between the LED light sources 16 are set as appropriate.

Also, two connectors 18 are mounted on the front surface 17a of the LED board 17. These connectors 18 are for relaying the supply of electric power (current) to each LED light source 16, and are provided at both ends in the longitudinal direction of the LED substrate 17. The connector 18 mainly includes a housing 18a made of an insulating synthetic resin and a terminal fitting (not shown) housed in the housing 18a. The external shape of the housing 18a is generally a rectangular parallelepiped, and has a box shape with one surface opened. A mating connector (not shown) is inserted into the opened portion.

In the case of this embodiment, one connector 18 is on the power source side, and a terminal fitting provided in the connector 18 is connected to an end portion on the anode side of the wiring pattern. An external drive control circuit (not shown) for supplying power and control signals necessary for lighting each LED light source 16 is connected to the terminal fitting provided in the connector 18 via a mating connector (not shown). Is done. On the other hand, the other connector 18 is the ground side, and the rear end portion of the terminal fitting provided in the connector 18 is connected to the end portion on the cathode side of the wiring pattern. In addition, the terminal metal fitting with which this connector 18 is equipped is earth | grounded via another other party connector (not shown).

The height of the connector 18 is set higher than the height of the LED light source 16. The height referred to here is a height based on the front surface plate surface 17a of the LED substrate 17, and is a distance extending in the vertical direction (Y-axis direction) from the plate surface 17a. The height of the connector 18 in the present embodiment is set to be, for example, about 0.1 mm to 0.5 mm and higher than the height of the LED light source 16. The two connectors 18 mounted on both ends of the LED substrate 17 have the same external shape and are set to have the same height from the plate surface 17a. Note that the surface of the housing 18a of the connector 18 is painted white, so that the light reflection efficiency is enhanced. When the housing 18a is painted white as described above, a decrease in luminance around the connector 18 is suppressed.

It should be noted that the connector 18 (housing 18a) used as the intervening portion is required to have a strength that does not break or deform even when the end surface 19c of the light guide plate 19 is pressed.

As shown in FIGS. 2 and 4, 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 has a front plate surface (front surface) 19a, a back plate surface (back surface) 19b, two

end surfaces

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

end surfaces

19e and 19f on the short side. is doing. In the case of this embodiment, one end surface 19c on the long side is a first end surface, and the other end surface 19d is a second end surface. The end surface 19d that is the second end surface is disposed in parallel to the end surface 19c that is the first end surface. The light guide plate 19 is accommodated in the chassis 14 so that the plate surface 19b on the back side faces the bottom 14a with the reflection sheet 20 interposed therebetween.

In the chassis 14, the light guide plate 19 is arranged such that one end surface 19 c on the long side is in contact with the end surfaces (top surfaces) 18 b of the two connectors 18 mounted on the LED substrate 17. . The end surface 19 c of the light guide plate 19 faces the LED light source 16. The end surface 19c is a light incident surface on which light emitted from the LED light source 16 is incident. Further, the front surface 19a of the light guide plate 19 is a light emitting surface, and the light incident from the end surface (light incident surface) 19c is transmitted to the optical sheet 15 and the liquid crystal panel disposed above the light guide plate 19. 11 is emitted. 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 inside of the light guide plate 19 from the end surface (light incident surface) 19c 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.

Further, as shown in FIG. 4, in the chassis 14, the end surface 19d on the other long side of the light guide plate 19 is disposed on the wall 14d side. There is a gap between the end surface 19d of the light guide plate 19 and the wall 14d, and the elastic member 22 is filled in the gap. That is, the end surface 19d of the light guide plate 19 and the wall 14d face each other with the elastic member 22 interposed therebetween. The two

end surfaces

19e and 19f on the short side of the light guide plate 19 are opposed to the

walls

14e and 14f, respectively. FIG. 4 shows the lighting device 12 with the optical sheet 15 and the frame 21 removed.

The elastic member 22 has a shape extending along the long side direction of the light guide plate 19 and is made of an elastically deformable material. The elastic member 22 is accommodated in the chassis 14 in a slightly compressed state between the end surface 19d of the light guide plate 19 and the wall 14d. The end surface 19c of the light guide plate 19 is the end surface of the housing 18a included in the connector 18. It is pressing toward 18b. In the present embodiment, the elastic member 22 has a prismatic shape extending along the long side direction of the light guide plate 19. The elastic member 22 is formed by processing a rubber material such as natural rubber or synthetic rubber (elastomer or the like) into a predetermined shape. When the elastic member 22 is made of a rubber material, it is easy to process the elastic member 22 into a predetermined shape. The elastic member 22 may be porous. A preferable material (rubber material) used for the elastic member 22 includes, for example, urethane foam such as Polon (registered trademark).

The elastic member 22 is disposed so as to cover the end surface 19 d of the light guide plate 19. The elastic member 22 suppresses light that has entered the light guide plate 19 from the light incident surface (end surface) 19c from leaking to the outside from the end surface 19d. The color of the elastic member 22 is preferably white. For example, the surface of the elastic member 22 may be painted with a white paint having a light reflectance of 70% or more. Further, the elastic member 22 may be manufactured using white rubber as a raw material. Thus, by configuring the elastic member 22 to be white, it is possible to efficiently reflect the light to be emitted from the end surface 19d of the light guide plate 19 to the outside and return the light into the light guide plate 19 again. it can.

As shown in FIG. 2 and the like, 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. The peripheral edge of the liquid crystal panel 11 is placed on the inner peripheral 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 16 on the LED substrate 17 included in the illumination device 12 emits light (lights up). When each LED light source 16 emits light, light enters the light guide plate 19 from the end face (light incident surface) 19 c of the light guide plate 19. The incident light is reflected by the reflecting sheet 20 laid on the back side of the light guide plate 19, the reflecting portion formed on the back surface 19 b or the front surface 19 a of the light guide plate 19, and the like while traveling through the light guide plate 19. The light is emitted from the front side plate surface (light emitting surface) 19a. 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.

The light guide plate 19 provided in the illumination device 12 of the present embodiment is positioned in the chassis 14 while being sandwiched between the connector 18 and the elastic member 22 mounted on the LED substrate 17. The end surface 19 c of the light guide plate 19 is pressed toward the connector 18 by the elastic force (restoring force) of the elastic member 22. As shown in FIG. 3 and FIG. 4, the distance (distance) between the end surface (light incident surface, first end surface) 19 c of the light guide plate 19 and the LED light source 16 is a connector (on the LED board 17). Intervening portion) 18 and is kept constant by the connector 18.

For example, when the illumination device 12 vibrates due to an external force applied, the elastic member 22 in contact with the end surface 19d of the light guide plate 19 absorbs the vibration, so that the vibration of the light guide plate 19 is suppressed and the light guide plate The position shift of 19 is suppressed.

Also, the temperature in the illumination device 12 may increase with the light emission of the LED light source 16 and the light guide plate 19 may expand (thermal expansion). In such a case, the length of the light guide plate 19 in the short side direction is increased so that the end surface 19 d faces the elastic member 22. At that time, the elastic member 22 is pressed and compressed by the end surface 19d of the light guide plate 19 and the shape thereof is reduced. When the light guide plate 19 expands, the end surface (light incident surface) 19 c of the light guide plate 19 remains pressed against the connector 18 on the LED substrate 17. That is, the distance between the end surface 19c of the light guide plate 19 and the LED light source 16 does not change even when the light guide plate 19 expands. Further, even when the light guide plate 19 that has expanded contracts and returns to its original size, the distance between the end surface 19c of the light guide plate 19 and the LED light source 16 remains constant due to the elastic force of the elastic member 22. Kept.

When the light guide plate 19 expands in the long side direction, the light guide plate 19 moves so that the end surface 19d of the light guide plate 19 approaches the wall 14e, or the end surface 19f of the light guide plate 19 approaches the wall 14f. In consideration of thermal expansion of the light guide plate 19, gaps are provided in advance between the end surface 19e and the end surface 19f of the light guide plate 19 and the wall 14e and the end surface 14f.

As described above, the light guide plate 19 included in the illumination device 12 of the present embodiment is held in a stable state in the chassis 14 without causing positional displacement or rattling. As described above, the distance between the end surface 19c of the light guide plate 19 and the LED light source 16 is kept constant even by external vibration or expansion and contraction of the light guide plate 19. That is, the amount of light incident from the end surface (light incident surface) 19c does not change. Therefore, in the illuminating device 12 of the present embodiment, the luminance (brightness) of the light emitted toward the back surface 11b of the liquid crystal panel 11 is suppressed from changing due to external vibrations and expansion / contraction of the light guide plate 19. Yes.

In addition, the illuminating device 12 of this embodiment is not provided with the protrusion part which protruded in the convex shape at the both ends of the light-guide plate. Therefore, unlike the prior art, light does not leak from the protrusions, and the outer portions (for example, the

walls

14e and 14f) surrounding the light guide plate are not enlarged. The illuminating device 12 of this embodiment is suitable for the so-called narrow frame liquid crystal display device 10.

Further, in the lighting device 12 of the present embodiment, an error in processing (cutting) accuracy in the light guide plate 19 is absorbed by the elastic member 22.

<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. Also, the description of the action / effect will be omitted if it overlaps. In the present embodiment, a liquid crystal display device 10A including the illumination device 12A is illustrated.

FIG. 5 is a cross-sectional view of the liquid crystal display device 10A according to the second embodiment. The cross-sectional configuration of the liquid crystal display device 10A shown in FIG. 5 corresponds to the cross-sectional configuration of the liquid crystal display device 10 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 configuration of the illumination device 12A included in the liquid crystal display device 10A is partially different from that of the first embodiment. Specifically, a point in which a reflective layer 23 is provided between the elastic member 22 provided in the lighting device 12A and the end surface 19d of the light guide plate 19, and a screw (for fixing the LED substrate 17 to the wall 14c) The point that the screw 118 is used as the interposition part is different from that of the first embodiment.

As shown in FIG. 5, a tape-like (band-like) reflective layer 23 is attached to the end surface 19 d of the light guide plate 19. The reflective layer 23 is made of synthetic resin or the like, and is attached to the end surface 19d of the light guide plate 19 via a transparent adhesive. The reflective layer 23 is preferably thinner (thickness in the Y-axis direction). The reflective layer 23 is white and has excellent light reflectivity. The reflective layer 23 is provided so as to cover the end surface 19 d of the light guide plate 19. The elastic member 22 is opposed to the end surface 19 d of the light guide plate 19 through the reflective layer 23. As described above, the reflection layer 23 may be interposed between the end surface 19d of the light guide plate 19 and the elastic member 22 to suppress leakage of light in the light guide plate 19 from the end surface 19d to the outside.

In other embodiments, the reflective layer 23 may be attached to the elastic member 22 instead of the end face 19d of the light guide plate 19. In another embodiment, a coating film formed by applying a white paint to the end surface 19 d of the light guide plate 19 may be used as the reflective layer 23.

Moreover, 12 A of illuminating devices of this embodiment are utilizing the screw | thread 118 for fixing the LED board 17 to the wall 14c as an interposition part which interposes between the LED board 17 and the end surface 19d of the light-guide plate 19. FIG. The tip end side of the screw 118 is screwed to the LED board 17 and the wall 14c while penetrating the LED board 17 from the plate surface 17a side and entering the wall 14c. The rear end side of the screw 118 is exposed from the plate surface 17 a side of the LED substrate 17, and the height of the exposed portion of the screw 118 (height from the plate surface 17 a) is higher than the height of the LED light source 16. It is set to be high. The rear end surface 118 a of the screw 118 is in contact with the end surface 19 c of the light guide plate 19.

A plurality of screws (screws) 118 are used on the LED substrate 17 so as to be arranged at equal intervals. The height of each screw 118 (the height of the portion exposed from the plate surface 17a of the LED substrate 17) is set to be the same. The screw 118 is painted white to enhance light reflectivity. A connector is also mounted on the LED substrate 17 of the present embodiment. In the case of this embodiment, the height of the connector (housing) is set lower than the height of the screw 118. In FIG. 5, the connector is omitted for convenience of explanation.

As described above, by using the screw 118, the interval (distance) between the end surface (light incident surface, first end surface) 19c of the light guide plate 19 and the LED light source 16 may be defined to keep the interval constant. .

<Embodiment 3>
Next, Embodiment 3 of the present invention will be described with reference to FIGS. In the present embodiment, a liquid crystal display device 10B including the illumination device 12B is illustrated. FIG. 6 is a cross-sectional view of the liquid crystal display device 10B according to the third embodiment. The cross-sectional configuration of the liquid crystal display device 10B shown in FIG. 6 corresponds to the cross-sectional configuration of the liquid crystal display device 10 shown in FIG.

The basic configuration of the liquid crystal display device 10B of the present embodiment is the same as that of the first embodiment. However, the configuration of the illumination device 12B included in the liquid crystal display device 10B is partially different from that of the first embodiment. Specifically, the shape of the elastic member 22B is different from that of the first embodiment. Along with this, the shapes of the chassis 14, the frame 21 and the like are also partially changed.

The elastic member 22B is formed between a pair of sandwiching portions 22B1 and 22B2 that sandwich the end portion on the end surface 19d side of the light guide plate 19 from the front side and the back side, and between the sandwiching portions 22B1 and 22B2, and the light guide plate 19 And a recess 22B3 into which the end is inserted.

The external shape of the elastic member 22B is substantially a prismatic shape along the long side direction (X-axis direction) of the light guide plate 19, and the concave portion 22B3 is formed in a groove shape along the length direction of the elastic member 22B. ing. The elastic member 22B is manufactured by processing a rubber material or the like as in the first embodiment. The elastic member 22B can be attached to the light guide plate 19 by inserting the end portion of the light guide plate 19 into the recess 22B3.

FIG. 7 is an explanatory view schematically showing a process of housing the light guide plate 19 in the chassis 14 with the elastic member 22B attached to the end. As shown in FIG. 7, the elastic member 22 B can be attached to the end of the light guide plate 19. In this embodiment, the elastic member 22B is attached to the end of the light guide plate 19 in advance, and then the light guide plate 19 can be accommodated in the chassis 14 with the elastic member 22B attached.

When the light guide plate 19 is accommodated in the chassis 14, first, the end on the end surface 19 c side is put into the chassis 14, and the end is brought into contact with the connector 18 (housing 18 a) on the LED board 17. In this case, the plate surface 19a of the light guide plate 19 is inclined with respect to the bottom 14a, and the end on the end surface 19d side is disposed above the bottom 14a.

Next, with the end portion on the end surface 19c side kept in contact with the connector 18, the end portion on the end surface 19d side is lowered toward the inside of the chassis 14 together with the elastic member 22B. Then, the end on the end surface 19d side enters the chassis 14 together with the elastic member 22B, and the elastic member 22B contacts the wall 14d and is pushed toward the bottom 14a while being transmitted along the wall 14d. As a result, the elastic member 22B is stopped while being in contact with the bottom 14a and the wall 14d. In this way, as shown in FIG. 6, the light guide plate 19 is accommodated in the chassis 14 with the end surface 19c in contact with the connector 18 and the end surface 19d in contact with the elastic member 22B. The elastic member 22B is sandwiched between the end surface 19d of the light guide plate 19 and the wall 14d, and is slightly compressed and has a slightly smaller shape.

The bottom 14a of the chassis 14 is set such that the central portion 14g is higher than the peripheral portion. The central portion 14 g faces the plate surface 19 b on the back side of the light guide plate 19 with the reflection sheet 20 interposed therebetween. The elastic member 22B is accommodated in a hollow peripheral portion that is lower than the central portion 14g. Further, the frame 21 includes a protruding portion 21a protruding downward to press the plate surface 19a of the light guide plate 19 inside the sandwiching portion 22B2 of the elastic member 22B. Further, the portion of the frame 21 arranged on the LED light source 16 side is also provided with a protruding portion 21 b protruding downward to hold down the plate surface 19 a of the light guide plate 19.

When the elastic member 22B has a structure attached to the end portion of the light guide plate 19 as in this embodiment, the elastic member 22B can be easily filled between the end surface 19d of the light guide plate 19 and the wall 14d. The light guide plate 19 can be easily positioned in the chassis 14. That is, the working efficiency of the process of housing the light guide plate 19 in the chassis 14 is improved.

Further, the light guide plate 19 is difficult to be displaced in the long side direction (X-axis direction) (the length direction of the elastic member 22B) due to vibration or the like. As for the edge part of the light-guide plate 19, while the end surface 19d contacts with the elastic member 22B, the front side contacts the clamping part 22B2, and the back side contacts the clamping part 22B1. That is, the end area of the light guide plate 19 has a larger contact area with the elastic member 22B than in the first embodiment. The elastic member 22B sandwiches the end portion of the light guide plate 19 with a predetermined force. Therefore, the light guide plate 19 included in the illumination device 12B of the present embodiment is difficult to be displaced in the long side direction (X-axis direction) of the light guide plate 19.

<Embodiment 4>
Next, Embodiment 4 of the present invention will be described with reference to FIG. In the present embodiment, a liquid crystal display device 10C including the illumination device 12C is illustrated. FIG. 8 is a cross-sectional view of a liquid crystal display device 10C according to the fourth embodiment. The cross-sectional configuration of the liquid crystal display device 10C shown in FIG. 8 corresponds to the cross-sectional configuration of the liquid crystal display device 10 shown in FIG.

The basic configuration of the liquid crystal display device 10C of the present embodiment is the same as that of the third embodiment. However, the configuration of the illumination device 12C included in the liquid crystal display device 10C is partially different from that of the third embodiment. Specifically, the shape of the elastic member 22C included in the lighting device 12C is partially different from the shape of the elastic member 22B of the third embodiment.

As shown in FIG. 8, the elastic member 22C includes a pair of sandwiching portions 22C1 and 22C2 that sandwich the end portion on the end surface 19d side of the light guide plate 19 from the front side and the back side, similarly to the elastic member 22B of the third embodiment. And a recess 22C3 into which the end of the light guide plate 19 is inserted. The elastic member 22 C is sandwiched between the end surface 19 d of the light guide plate 19 and the wall 14 d in the chassis 14.

However, as shown in FIG. 8, the end of the elastic member 22C on the side in contact with the wall 14d is chamfered into a curved surface. The end portion of the elastic member 22C is chamfered along the direction in which the end surface 19d of the light guide plate 19 extends (long side direction, X-axis direction). The upper end portion and the lower portion of the end portion of the elastic member 22C are both chamfered. Therefore, the cross-sectional shape at the end of the elastic member 22C on the side in contact with the wall 14d is substantially semicircular as shown in FIG. That is, the end portion of the elastic member 22 C has a semi-columnar shape extending along the long side direction of the light guide plate 19.

Also in this embodiment, the light guide plate 19 is accommodated in the chassis 14 by the same method as that of the third embodiment (see FIG. 7) with the elastic member 22C attached to the end. When the end portion of the elastic member 22C is chamfered as in the present embodiment, the work efficiency of housing the light guide plate 19 in the chassis 14 is improved as compared with the case of the third embodiment. This is because the end portion of the elastic member 22 C is processed into a curved surface, and the portion in contact with the wall 14 d is reduced while the elastic member 22 C is housed in the chassis 14. Therefore, the end on the end surface 19d side of the light guide plate 19 can move smoothly along the inner side of the wall 14d even when the elastic member 22C is still attached. Therefore, in the illuminating device 12C of this embodiment, the working efficiency of the process of housing the light guide plate 19 in the chassis 14 is further improved.

Note that in the illumination device 12C of the present embodiment, as in the third embodiment, the light guide plate 19 is difficult to be displaced due to vibration or the like in the long side direction (X-axis direction).

<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, the connector 18 is used as the interposition part, and in the second embodiment, the screw 118 is used as the interposition part, but in other embodiments, other than these are used. You may use as an interposition part. For example, a protrusion that is interposed between the LED substrate 17 and the light guide plate 19 may be provided on the plate surface 17 a of the LED substrate 17, and this protrusion may be used as the interposed portion. The height of the interposition part from the plate surface 17a needs to be set higher than the height of the LED light source 16 from the plate surface 17a. The intervening portion is required to have a strength that does not cause breakage or deformation even when the end surface 19c of the light guide plate 19 is pressed.

(2) In each of the above embodiments, either the connector 18 or the screw 118 is used as the interposition part. In other embodiments, both the connector 18 and the screw 118 may be used as an intervening part.

(3) In Embodiment 4, the end of the elastic member 22C on the side in contact with the wall 14d is chamfered into a curved surface from both the upper and lower sides. In another embodiment, for example, a curved chamfering process may be performed only on the upper side or only on the lower side of the end portion of the elastic member 22C.

(4) In each of the above-described embodiments, the light source plate 19 is provided with the LED light source 16 so as to face one end surface 19c on the long side, and elastic member so as to contact the other end surface 19d on the long side. 22 was arranged. In another embodiment, for example, the LED light source 16 is disposed so as to face one end surface 19e on the short side of the light guide plate 19, and the elastic member is in contact with the other end surface 19f on the short side. 22 may be arranged.

(5) In each of the above embodiments, the thickness of the light guide plate 19 is uniform, and the width in the thickness direction of the end surface 19c and the width in the thickness direction of the end surface 19d are set to be the same. In another embodiment, for example, the light guide plate 19 set so that the thickness decreases from the end surface 19c side to the end surface 19d side may be used.

(6) In the fourth embodiment, the end of the elastic member 22C on the side in contact with the wall 14d is chamfered into a curved surface. In other embodiments, for example, the end of the elastic member 22C may be chamfered in a planar shape, for example. That is, the cross-sectional shape (cross-sectional shape viewed from the X-axis direction) of the end portion of the elastic member 22C may be a polygonal shape. The end portion of the elastic member 22 is preferably chamfered so that the contact portion between the end portion of the elastic member 22 and the wall 14d can be reduced to some extent.

10, 10A, 10B, 10C ... Liquid crystal display device (display device), 11 ... Liquid crystal panel (display panel), 12, 12A, 12B, 12C ... Illumination device, 13 ... Bezel, 14. .. Chassis (accommodating member), 14a ... bottom, 14c ... wall (first wall), 14d ... wall (second wall), 14e, 14f ... wall, 15 ... optical sheet , 16 ... LED light source (light source), 17 ... LED substrate (light source substrate), 17a ... plate surface on the front side of the LED substrate, 17b ... plate surface on the back side of the LED substrate, 18 ... Connector (intervening part), 18a ... housing, 19 ... light guide plate, 19a ... plate surface on the front side of the light guide plate (light emitting surface), 19b ... plate surface on the back side of the light guide plate, 19c .. End face (first end face), 19d ... End face (second end face), 19e, 19f ... End face, 20 ... Reflective sheet, 21 ... Frame, 22, 22B, 22C ... Elasticity Member, 23 ... reflective layer

Claims

A light source;
A light guide plate that guides light from the light source, which is one end surface of the light guide plate, a first end surface on which light from the light source is incident facing the light source, and one end surface of the light guide plate A light guide plate having a second end surface arranged in parallel to the first end surface, and a light emitting surface that is a plate surface of the light guide plate and emits light incident from the first end surface;
A housing member having a bottom facing the plate surface of the light guide plate, a first wall facing the first end surface and rising from the bottom, and a second wall facing the second end surface and rising from the bottom; ,
A light source substrate disposed between the first end surface and the first wall so that the light source is mounted and the light source faces the first end surface;
An interposition part interposed between the light source substrate and the first end face;
An illuminating device comprising: an elastic member filled between the second wall and the second end surface.
The lighting device according to claim 1, wherein the elastic member is made of a rubber material.
The elastic member is formed between a pair of sandwiching portions that sandwich the end portion of the light guide plate including the second end surface from the front side and the back side, and the end portion of the light guide plate is inserted between the sandwiched portions. The lighting device according to claim 1, further comprising a recess.
The lighting device according to any one of claims 1 to 3, wherein the elastic member has a chamfered end along a direction in which the second end surface extends in an end portion in contact with the second wall.
The lighting device according to any one of claims 1 to 4, wherein the elastic member exhibits a white color.
The lighting device according to any one of claims 1 to 5, wherein a reflective layer is interposed between the elastic member and the second end surface.
The illumination device according to any one of claims 1 to 6, wherein the interposition part is made of a screw for fixing the light source substrate to the second wall.
The lighting device according to any one of claims 1 to 6, wherein the interposition portion is mounted on the light source board and includes a connector that relays power supplied to each light source.
The illuminating device according to any one of claims 1 to 8, wherein the interposition part exhibits white.
The lighting device according to any one of claims 1 to 9,
A display panel that performs display using light from the illumination device.
The display device according to claim 10, wherein the display panel is a liquid crystal panel using liquid crystal.
A television receiver comprising the display device according to claim 10 or 11.