WO2013002174A1

WO2013002174A1 - Illuminating device, display device and television receiver

Info

Publication number: WO2013002174A1
Application number: PCT/JP2012/066139
Authority: WO
Inventors: 耕作飯田
Original assignee: シャープ株式会社
Priority date: 2011-06-28
Filing date: 2012-06-25
Publication date: 2013-01-03

Abstract

An illuminating device (12) of the present invention is provided with a light source (16), and a chassis (14) for assembling the light source (16), said chassis (14) having a recessed and projected pattern (40) formed on a chassis (14) surface on the side from which light emitted from the light source (16) is outputted, and being provided with a reflecting coated film (20) that covers the recessed and projected pattern (40). Consequently, the reflecting coated film (20) formed on the chassis (14) has excellent diffuse reflection characteristics.

Description

Lighting device, display device, and television receiver

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

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

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

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

The plate surface on the back side of the light guide plate is covered with a reflective sheet laid on the bottom plate of the chassis. The reflection sheet is a white plastic sheet or the like. Therefore, the light incident from the light incident surface is reflected by the reflection sheet on the back side of the light guide plate, rises, and is emitted from the light emission surface.

By the way, since the reflection sheet is thin and easily bent, when the reflection sheet is mounted in the chassis, the reflection sheet may be bent to form creases or wrinkles in the reflection sheet. Further, the reflective sheet may expand and contract under the influence of temperature, humidity, etc., and wrinkles may occur. Thus, when wrinkles etc. were formed in the said reflective sheet, the reflective efficiency of the said reflective sheet fell and it was a problem.

Patent Document 1 discloses a technique for forming a reflective coating directly on the bottom plate of the chassis instead of using the reflective sheet. The reflective coating is formed by applying a paint containing a resin and a titanium oxide pigment on a flat aluminum plate. Patent Document 1 shows that the reflective coating film has a high diffuse reflectance.

JP 2002-172735 A

(Problems to be solved by the invention)
However, in recent years, with an increase in the size of a display device or the like, the reflective coating film is required to have a higher diffuse reflectance. The reflective coating described in Patent Document 1 and the like is problematic because it cannot satisfy today's requirements.

An object of the present invention is to provide an illuminating device in which a reflective coating film having excellent diffuse reflectivity is formed on a chassis, a display device including the illuminating device, and a television receiver including the display device.

(Means for solving the problem)
The illumination device according to the present invention is a chassis for assembling a light source and the light source, wherein a concave / convex pattern is formed on a surface of the chassis on a side where light from the light source is emitted, and the concave / convex pattern A chassis comprising a reflective coating covering the substrate.

In the lighting device, comprising a light guide plate that is composed of a plate-like member that emits light incident from the end surface from the front plate surface, and is assembled to the chassis so that the back plate surface faces the reflective coating film, A light source may be assembled to the chassis so as to face the end face of the light guide plate.

The lighting device may include an interposition portion interposed between the chassis and the light guide plate so that a plate surface on the back side of the light guide plate does not come into contact with the reflective coating film.

In the illuminating device, the interposition part may be fixed to the chassis so as to come into contact with a peripheral part on a plate surface on the back side of the light guide plate.

In the lighting device, the interposition part may be made of a heat dissipation material.

In the lighting device, the chassis may be made of a metal material.

In the illumination device, the uneven pattern may be formed by processing an uneven surface of the chassis.

In the illumination device, the reflective coating film may have a concavo-convex shape along the concavo-convex pattern.

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)
ADVANTAGE OF THE INVENTION According to this invention, the illuminating device by which the reflective coating film excellent in diffuse reflectivity is formed in the chassis, the display apparatus provided with the said illuminating device, and the television receiver provided with the said display apparatus can be provided.

1 is an exploded perspective view showing a schematic configuration of a television receiver according to Embodiment 1 of the present invention. Exploded perspective view showing schematic configuration of liquid crystal display device AA 'sectional view of the liquid crystal display device shown in FIG. Explanatory drawing which represented typically the process of forming an uneven pattern on the surface of a substrate by blasting Enlarged cross-sectional view schematically showing an uneven pattern An enlarged cross-sectional view schematically showing a reflective coating film formed on an uneven pattern Sectional drawing of the liquid crystal display device which concerns on Embodiment 2. FIG. The top view of the chassis with which the illuminating device which concerns on Embodiment 2 is provided. Sectional drawing of the liquid crystal display device which concerns on Embodiment 3. FIG. Enlarged sectional view schematically showing a modification of the uneven pattern and the reflective coating

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

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

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

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

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

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

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

The illuminating device 12 is a so-called edge light type (side light type), and mainly includes a chassis (housing member) 14, an optical sheet 15, an LED light source (light source) 16, an LED substrate (light source substrate) 17, A light guide plate 19, a reflective coating film 20, and a frame 21 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 plate 14a that is horizontally long when viewed from the front side, a pair of

walls

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

walls

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

An uneven pattern 40 is formed on the bottom plate 14 a of the chassis 14. The uneven pattern 40 is provided directly on the surface of the bottom plate 14a. The concavo-convex pattern 40 is formed on the surface of the chassis 14 on the side where the light from the LED light source 16 is emitted as planar light through the light guide plate 19.

The concavo-convex pattern 40 is formed by known concavo-convex processing such as blasting, pressing, embossing, and cutting. Here, a method of forming a concavo-convex pattern on the surface of the bottom plate 14a using blasting will be described. FIG. 4 is an explanatory view schematically showing a process of forming an uneven pattern on the surface of the substrate 114a by blasting (sand blasting). FIG. 4 shows a substrate 114a formed of a bottom plate before the uneven pattern is formed. The substrate 114a is made of aluminum, and its surface is flat. Above the substrate 114a, a nozzle 50 for injecting the fine powdery injection material 51 toward the plate surface 214a of the substrate 114a is disposed. The nozzle 50 is moved along the plate surface of the substrate 114a, and the spray material is sprayed from the nozzle 50 toward the plate surface 214a of the substrate 114a, whereby the plate surface 214a of the substrate 114a is sprayed by the spray material. It is cut into a pattern. Then, the concave / convex pattern 40 is formed on the plate surface 214a.

FIG. 5 is an enlarged cross-sectional view schematically showing the concavo-convex pattern 40. As shown in FIG. 5, the uneven pattern 40 is formed on the plate surface of the substrate 114a (bottom plate 14a). In the case of this embodiment, the range of the uneven pattern 40 formed on the bottom plate 14a is set to be approximately the same as the size of the plate surface 19b on the back side of the light guide plate 19 described later. The uneven pattern 40 is uniformly formed within the plate surface of the bottom plate 14a.

The reflective coating film 20 is formed on the plate surface of the bottom plate 14 a so as to cover the uneven pattern 40. The reflective coating film 20 is obtained by applying a coating material obtained by dispersing a pigment such as titanium oxide in a resin solution containing a synthetic resin such as a polyester resin, an acrylic resin, a urethane resin, or an epoxy resin to the uneven pattern 40. Become. That is, the reflective coating film 20 itself is prepared from a known reflective paint.

FIG. 6 is an enlarged cross-sectional view schematically showing the reflective coating film 20 formed on the uneven pattern 40. As shown in FIG. 6, the reflective coating film 20 has a shape along the concavo-convex pattern 40 formed on the plate surface of the bottom plate 14 a. That is, the uneven pattern 40 is also formed on the surface of the reflective coating film 20. That is, the thickness of the reflective coating film 20 is adjusted as appropriate so that an uneven pattern is formed on the surface of the reflective coating film 20. Thus, by forming the uneven | corrugated pattern 40 on the surface of the reflective coating film 20, the diffuse reflectance of the reflective coating film 20 is improved. In addition, the reflective coating film 20 of this embodiment is exhibiting white.

The LED light source (light source) 16 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 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 3, the LED substrate 17 has a long shape (band shape) extending in the long side direction (X-axis direction) of the chassis 14. The LED light source 4 described above is surface-mounted on the front surface 17 a of the LED substrate 17. A plurality of LED light sources 4 are mounted on the plate surface 17a, and are arranged on the plate surface 17a so as to be arranged in a line along the longitudinal direction of the LED substrate 17. The LED light sources 4 are electrically connected (series connected) to each other by a wiring pattern to be described later.

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 board 17 is assembled along the long side wall 14c so that the LED light source 16 faces the inside of the chassis 14.

The LED substrate 17 is formed on a long (longitudinal) base material made of a metal material such as an aluminum material, an insulating layer made of a synthetic resin formed on the base material, and the insulating layer. A wiring pattern made of a metal film such as copper foil and a reflective layer made of a white insulating film formed on the insulating layer so as to cover the wiring pattern are provided. For convenience of explanation, in FIG. 3 and the like, the base material, the insulating layer, the wiring pattern, and the reflective layer in the LED substrate 17 are shown integrally.

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

end surfaces

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

end surfaces

19e and 19f on the short side. The light guide plate 19 is accommodated in the chassis 14 such that the back plate surface 19 b faces the reflective coating film 20.

In the chassis 14, the end surface 19 c of the light guide plate 19 faces the LED light source 16 with a predetermined interval. The end surface 19c is a light incident surface 19c on which light emitted from the LED light source 16 is incident. The front surface 19a of the light guide plate 19 is a light exit surface, and the light incident from the light incident surface 19c is directed toward the optical sheet 15 and the liquid crystal panel 11 disposed above the light guide plate 19. And exit. A plate surface 19 b on the back side of the light guide plate 19 is covered with a reflective coating film 20. The reflective coating 20 reflects light (diffuse reflection) incident on the inside of the light guide plate 19 from the light incident surface 19c and rises toward the front plate surface (light emitting surface) 19a.

In the chassis 14, the end surface 19d on the long side of the light guide plate 19 faces the wall 14d, and the end surfaces 19e and 19f on the short side of the light guide plate 19 face the

walls

14e and 14f, respectively. In addition, a plurality of locking pins (not shown) are erected on the bottom plate 14a, and the locking pins are inserted into the light guide plate 19 from the back plate surface 19b, whereby the light guide plate 19 is moved to the chassis 14. Is positioned inside.

On the front-side plate surface (light emitting surface) 19 a or the back-side plate surface 19 b 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. Patterning is performed so that light emitted from the plate surface (light emitting surface) 19a is adjusted to have a uniform distribution in the surface.

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

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

walls

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

wall

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

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

walls

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

When the liquid crystal display device 10 displays an image on the display surface 11a of the liquid crystal panel 11, each LED light source 16 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 light incident surface 19 c of the light guide plate 19. The incident light is reflected (diffuse reflected) by the reflective coating film 20 disposed on the back side of the light guide plate 19, and is formed on the back surface (plate surface) 19b or the front surface (plate surface) 19a of the light guide plate 19. The light is reflected by the reflecting portion or the like and travels through the light guide plate 19 and exits from the front 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.

In the illumination device 12 of the present embodiment, the plate surface 19b on the back side of the light guide plate 19 is covered with a reflective coating film 20. As described above, the reflective coating film 20 is formed so as to cover the uneven pattern 40 formed on the plate surface of the bottom plate 14a, and the surface of the reflective coating film 20 itself is also uneven. Therefore, the light irradiated to such a reflective coating film 20 is reflected (that is, diffusely reflected) in various directions by the uneven surface. Therefore, the reflective coating film 20 is excellent in diffuse reflectance.

The reflective coating film 20 is directly formed (adhered) on the plate surface of the bottom plate 14a. Therefore, when the light guide plate 19 is assembled in the chassis 14, even if the light guide plate 19 comes into contact with the reflective coating film 20, the position does not shift on the bottom plate 14 a. Moreover, the said reflective coating film 20 can be formed on the said baseplate 14a with a simple structure (and simple manufacturing method).

As described above, in the lighting device 12 of the present embodiment, the reflective coating film 20 formed on the bottom plate 14a of the chassis 14 is excellent in diffuse reflectivity. The same applies to the display device 10 including the illumination device 12 and the television receiver TV including the display device 10.

<Embodiment 2>
Next, 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. 7 is a cross-sectional view of the liquid crystal display device 10A according to the second embodiment. The part of the liquid crystal display device 10A shown in FIG. 7 corresponds to the part of the liquid crystal display 10 of the first embodiment shown in FIG. The basic configuration of the liquid crystal display device 10A of the present embodiment is the same as that of the first embodiment. However, the liquid crystal display device 10A of the present embodiment is different from that of the first embodiment in that an interposition part 22 is provided on the bottom plate 14a of the chassis 14 included in the liquid crystal display device 12A.

FIG. 8 is a plan view of the chassis 14 provided in the illumination device 12A according to the second embodiment. As shown in FIG. 8, a reflective coating film 20 is formed so as to cover a bottom plate 14a having a rectangular shape. And the interposition part 22 is provided in the four corners of the chassis 14, respectively. That is, in the case of this insulator form, the four interposition parts 22 are provided. The interposition part 22 consists of the same material as the baseplate 14a, and consists of aluminum in the case of this embodiment. The appearance of the interposition part 22 is a quadrangular prism. The interposition part 22 is fixed on the bottom plate 14a so as to protrude from the plate surface of the bottom plate 14a.

The end of the light guide plate 19 is placed on the upper end surface 22a of each interposition part 22. As shown in FIG. 7, the upper end surface 22 a of the interposition portion 22 is in contact with the end portion (circumferential end portion) of the plate surface 19 b on the back side of the light guide plate 19. In FIG. 8, the place where the light guide plate 19 is placed is indicated by a one-dot chain line.

The interposition part 22 is interposed between the light guide plate 19 and the bottom plate 14 a to prevent the plate surface 19 b on the back side of the light guide plate 19 from coming into contact with the reflective coating film 20. If the plate surface 19b on the back side of the light guide plate 19 is in direct contact with the reflective coating film 20, the plate surface 19b may be damaged by the reflective coating film 20. For example, when the light guide plate 19 expands and contracts under the influence of temperature and humidity, or when the light guide plate 19 is assembled to the chassis 14, the light guide plate 19 and the reflective coating 20 are in direct contact with each other, and the plate surface 19 b is You will be hurt. However, as in the present embodiment, when a predetermined intervening portion 22 is provided between the light guide plate 19 and the bottom plate 14a, the plate surface 19b moves away from the reflective coating film 20, so that the plate surface 19b is Can protect.

The distance (distance) between the plate surface 19b of the light guide plate 19 and the reflective coating 20 is set by appropriately adjusting the height of the interposition part 22 (height from the bottom plate 14a). In addition, when the space | interval (distance) of the said plate surface 19b and the reflective coating film 20 is too large, there exists a possibility that light may leak from the plate surface 19b of a light-guide plate. Therefore, it is preferable that the interval is set while taking into consideration prevention of light leakage from the plate surface 19b.

In addition, by providing the interposition part 22 as described above, the reflective coating film 12 itself is also prevented from being damaged and peeled off by contact with the plate surface 19b of the light guide plate 19.

As the installation location of the interposition part 22, it is preferable to set the upper end surface 22a of the interposition part 22 to be in contact with the peripheral end part of the light guide plate 19 as in the present embodiment. Thus, when the interposition part 22 is disposed in the chassis 14 so as to correspond to the peripheral end of the light guide plate 19, the interposition part 22 is disposed outside the display area of the liquid crystal panel 11. Therefore, even if a dark part (shadow) is generated by the interposition part 22, the dark part is suppressed from entering the display area.

Moreover, the interposition part 22 of this embodiment consists of aluminum, and is excellent in heat dissipation. Thus, when the interposition part 22 is manufactured using a material (heat dissipating material) excellent in heat dissipation such as a metal material, heat from the light guide plate 19 or the like is transmitted to the bottom plate 14 a of the chassis 14 by the interposition part 22. It can be moved (released) smoothly.

<Embodiment 3>
Next, Embodiment 3 of the present invention will be described with reference to FIG. FIG. 9 is a cross-sectional view of the liquid crystal display device 12B according to the third embodiment. The liquid crystal display device 10B of this embodiment includes a so-called direct-type illumination device 12B. A plurality of cold cathode fluorescent lamps (CCFLs) 16B as light sources are arranged on the back surface 11b side of the liquid crystal panel 11. The cold cathode fluorescent tubes 16B are arranged in parallel at intervals from each other in the chassis 14B. Each cold cathode fluorescent tube 16B is arranged on the bottom plate 14Ba of the chassis 14 by a holder (not shown). There is a gap between the cathode fluorescent tube 16 </ b> B and the bottom plate 14 </ b> Ba of the chassis 14.

An uneven pattern 40B is formed on the surface (inner surface) of the bottom plate 14Ba of the chassis 14 and the surfaces (inner surface) of the walls 14Bc, 14Bd and the like. And reflective coating 20B is formed so that this uneven | corrugated pattern 30B may be covered. Thus, the reflective coating film 20B may be formed not only on the bottom plate 14Ba of the chassis 14, but also on each wall 14Bc and the like. Further, as in the present embodiment, the reflective coating film 20B may be formed on the chassis 14B even in the direct type illumination device 12B.

<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 uneven pattern 40 is formed on the plate surface of the bottom plate 14a by blasting. In another embodiment, the regular uneven pattern 40C may be formed on the plate surface of the bottom plate 14a by, for example, pressing. FIG. 10 is an enlarged cross-sectional view schematically showing a modification of the uneven pattern 40C and the reflective coating film 20C. FIG. 10 shows a convex portion 41 that swells from the plate surface of the bottom plate 14 a and a concave portion 42 that is formed between adjacent convex portions 41. Each convex part 41 has comprised the shape extended mutually parallel on the board surface of the baseplate 14a. And the space | interval of convex parts 41 is kept substantially constant. Thus, the reflective coating film 20C may be formed on the regular uneven pattern 40C. And the surface of 20 C of reflective coating films may make regular uneven | corrugated shape.

(2) In Embodiment 1 described above, the reflective coating film 20 is formed on substantially the entire surface of the bottom plate 14a so as to cover the uneven pattern 40. In other embodiments, the reflective coating film 20 may be formed in a predetermined pattern. For example, it may be formed on the plate surface of the bottom plate 14a as a spot-like pattern having a predetermined in-plane distribution. In this case, you may set so that the size of a spot may become large, so that it distances from the LED light source 16. FIG.

(3) In the said Embodiment 1, the uneven | corrugated pattern 40 and the reflective coating film 20 are formed only on the board surface of the bottom board 14a. In other embodiments, for example, the uneven pattern 40 and the reflective coating film 20 may be formed on the inner surface of the wall 14d.

(4) In the second embodiment, the interposition part 22 is formed of a heat dissipation material. In other embodiments, the interposition part 22 may be formed from resin materials, such as an acrylic resin.

(5) In the second embodiment, the interposition part 22 has a quadrangular prism shape. In another embodiment, there is no restriction | limiting in particular, A cylindrical shape, a triangular prism, etc. may be sufficient.

DESCRIPTION OF SYMBOLS 10 ... Liquid crystal display device (display device), 11 ... Liquid crystal panel (display panel), 12 ... Illumination device (backlight device), 13 ... Bezel, 14 ... Chassis (housing member) , 15 ... optical sheet, 19 ... light guide plate, 20 ... reflective coating, 21 ... frame, 40 ... reflective coating

Claims

A light source;
A chassis for assembling the light source, wherein the chassis has a concavo-convex pattern formed on a surface of the chassis on the side from which light from the light source is emitted, and a chassis having a reflective coating film covering the concavo-convex pattern; A lighting device comprising:
It is composed of a plate-like member that emits light incident from the end surface from the front plate surface, and includes a light guide plate that is assembled to the chassis so that the back plate surface faces the reflective coating film,
The lighting device according to claim 1, wherein the light source is assembled to the chassis so as to face the end face of the light guide plate.
An illuminating device including an interposition portion interposed between the chassis and the light guide plate so that a plate surface on the back side of the light guide plate does not come into contact with the reflective coating film.
The illuminating device according to claim 3, wherein the interposition part is fixed to the chassis so as to come into contact with a peripheral part on a plate surface on the back side of the light guide plate.
The lighting device according to claim 3 or 4, wherein the interposition part is made of a heat dissipation material.
The lighting device according to any one of claims 1 to 5, wherein the chassis is made of a metal material.
The illumination device according to any one of claims 1 to 6, wherein the uneven pattern is formed by performing uneven processing on a surface of the chassis.
The illuminating device according to any one of claims 1 to 7, wherein the reflective coating film has an uneven shape along the uneven pattern.
A display device comprising: the illumination device according to any one of claims 1 to 8; and a display panel that performs display using light from the illumination device.
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.
A television receiver comprising the display device according to claim 9 or 10.