JP2013157173A - Lighting device and display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device capable of downsizing.SOLUTION: A lighting device 12 is provided with light sources 17, a chassis 14 having a bottom plate 14a and wall plates 14b1 erected from a peripheral edge of the bottom plate 14a, a mounting substrate 18 having a mounting face 18a including a light source mounting region S1 arranged toward a center side for mounting the light sources 17 as well as outside regions S2, S3 arranged outside the light source mounting region S1 and arranged on the bottom plate 14a in a way arranged inside the wall plates 14b1, a reflecting member 20 having a reflecting bottom part 20a arranged on the mounting face 18a in a way covering the light source mounting region S1 while containing hole parts 20e for exposing the light sources 17 for reflecting light from the light sources 17 and reflecting wall parts 20b erected from the reflecting bottom part 20a toward the wall plates 14b1 so as to form spaces Ma, Mb together with the wall plates 14b1 and the outside regions S2, S3 for reflecting the light, and circuit components 21 mounted on the outside regions S2, S3 and arranged inside the spaces Ma, Mb.

Description

  The present invention relates to a lighting device and a display device.

  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 light spread in a planar shape toward the back side of the liquid crystal panel.

  As the illuminating device, as shown in Patent Document 1, a device in which a light source is disposed on the back side (directly below) of a liquid crystal panel (so-called direct type) is known. This type of lighting device mainly includes the light source, a box-shaped chassis that accommodates the light source and opens toward the back side of the liquid crystal panel, and is disposed so as to cover the opening and transmits light from the light source. However, an optical member that adjusts while adjusting, and a reflection sheet that is arranged so as to cover the inside of the chassis. As the light source, as disclosed in Patent Document 1, an LED (Light Emitting Diode) has been used in recent years. The LED is housed in the chassis in a state of being mounted on a predetermined LED substrate.

  Moreover, as shown in Patent Document 1, a circuit board on which various circuit components for controlling display driving of a liquid crystal panel and LED lighting operation are mounted is attached to the outside of the chassis.

JP-A-2005-353498

  When the circuit board described above is attached to the outside of the chassis, the lighting device and the display device are enlarged, which is a problem.

  The objective of this invention is providing the illuminating device which can be reduced in size, and the display apparatus provided with the said illuminating device.

  The illumination device according to the present invention includes a light source, a chassis having a bottom plate, and a wall plate rising from a peripheral edge of the bottom plate, a light source mounting area disposed on the center side and mounting the light source, and an outside of the light source mounting area. The light source mounting includes a mounting substrate that includes a mounting surface including an outer region disposed on the bottom plate in a form disposed on the inner side of the wall plate, and a hole that exposes the light source. A reflective bottom portion that is disposed on the mounting surface so as to cover a region and reflects light from the light source; and rises from the reflective bottom portion toward the wall plate so as to form a space together with the wall plate and the outer region. A reflection member having a reflection wall portion that reflects light; and a circuit component that is mounted in the outer region and disposed in the space. The lighting device includes the mounting substrate disposed on the bottom plate of the chassis in a form disposed on the inside of the wall plate of the chassis. The mounting surface of the mounting substrate includes the light source mounting region on the center side where the light source is mounted and the outer region disposed outside the light source mounting region. A part of the reflection member that reflects light from the light source is disposed on the mounting surface. This part is the said reflective bottom part which covers the said light source mounting area | region, including the said hole part which exposes the said light source. Moreover, the said reflection member has the said reflection wall part as another part. The reflection wall portion rises from the reflection bottom portion toward the wall plate so as to form the space together with the wall plate and the outer region. In the lighting device, the circuit component is mounted in the outer region of the mounting substrate on which the light source is mounted and is disposed in the space. Therefore, the lighting device has a structure that can be downsized (particularly a structure that can be downsized in the thickness direction) because the circuit component can be arranged in the space in the chassis. Furthermore, the lighting device can easily arrange the circuit component in the space formed at a predetermined position in the chassis if the mounting substrate on which the light source is mounted is arranged on the bottom plate. it can.

  In the illuminating device, it is preferable that the mounting substrate is a single substrate. In the lighting device, when the mounting board is composed of a single board, for example, the manufacturing process and the number of parts can be reduced as compared with a case where the mounting board is composed of a combination of a plurality of board pieces. Etc. can be achieved.

  In the lighting device, the circuit component may be electrically connected to the light source.

  In the lighting device, the mounting board may have a wiring pattern that electrically connects the circuit component and the light source.

  In the illumination device, the circuit component may supply power to the light source.

  In the lighting device, the mounting board has a rectangular shape, the light source mounting area is arranged at a central portion of the mounting surface along one side direction of the mounting board, and the outer area is the light source mounting area. It may include two portions arranged along the one side direction so as to sandwich the circuit component, and the circuit component may be mounted on each of the two portions of the outer region.

  The illumination device includes an optical lens that is provided on the mounting surface so as to face the light source and transmits light from the light source, and the hole exposes the optical lens together with the light source. There may be.

  The said illuminating device WHEREIN: The said reflection wall part may stand | start up, inclining toward the said wall board from the said reflection bottom part.

  In the illumination device, the light source may be composed of a plurality of LED light sources.

  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 circuit component may transmit an image signal to the display panel.

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

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

  ADVANTAGE OF THE INVENTION According to this invention, the illuminating device which can be reduced in size and the display apparatus provided with the said illuminating device 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 A-A 'line sectional view of FIG. Top view of the backlight device with the optical member and frame removed Top view of mounting board FIG. 3 is an enlarged sectional view of the vicinity of the LED and the diffusion lens Sectional drawing which shows schematic structure of the liquid crystal display device which concerns on Embodiment 2. FIG. Sectional drawing which shows schematic structure of the liquid crystal display device which concerns on Embodiment 3. FIG.

<Embodiment 1>
Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 6. In this embodiment, the liquid crystal display device 10 used for the television receiver TV is 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. Also, the upper side of 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 a television receiver according to Embodiment 1 of the present invention. As shown in FIG. 1, the television receiver TV according to the present embodiment includes a liquid crystal display device 10, front and back cabinets Ca and Cb that are accommodated so as to sandwich the liquid crystal display device 10, a power source (not shown), A tuner (not shown) and a stand S are provided. The liquid crystal display device (display device) 10 has a horizontally long rectangular shape as a whole, and is housed in the cabinets Ca and Cb with its display surface standing upright. 2 is an exploded perspective view showing a schematic configuration of the liquid crystal display device 10, and FIG. 3 is a cross-sectional view taken along line A-A 'of FIG. As shown in FIG. 2, the liquid crystal display device 10 includes a liquid crystal panel (display panel) 11, a backlight device (illumination device) 12 that is an external light source, and a bezel 13. The bezel 13 is made of a metal frame-like member, and is assembled to the liquid crystal display device 10 in a state where the bezel 13 is put on the peripheral edge of the liquid crystal panel 11.

  The liquid crystal panel 11 has a rectangular shape in plan view, and has a configuration in which a pair of glass substrates are bonded together with a predetermined gap therebetween, and liquid crystal is sealed between the glass substrates. Among these substrates, one glass substrate disposed on the back side (back side) is a so-called thin film transistor (hereinafter, TFT) array substrate, and the other glass substrate disposed on the display surface side (front side) is This is a so-called color filter (hereinafter referred to as CF) substrate.

  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 supplied with image data and various control signals necessary for displaying an image from a predetermined control circuit (a signal unit 21b described later) on the above-described source wiring, gate wiring, counter electrode, and the like. It is configured and driven by a so-called active matrix method. The liquid crystal panel 11 is provided with polarizing plates on the display surface side and the back surface side so as to sandwich the pair of glass substrates.

  As shown in FIG. 2, the backlight device 12 mainly includes a chassis 14, an optical member 15, a frame 16, an LED (light source) 17, a substrate (mounting substrate) 18, and a diffusion lens (optical lens). 19 and the reflection member 20 are provided. FIG. 4 is a plan view of the backlight device 12 with the optical member 15 and the frame 16 removed.

  The chassis 14 generally has a shallow box shape with an opening on the liquid crystal panel 11 side (front side), and is made of a metal (for example, aluminum) plate member processed into a predetermined shape. . The chassis 14 includes a bottom plate 14a having a rectangular shape in plan view, a wall plate 14b rising from an end of each side of the bottom plate 14a, and a receiving plate 14c projecting outward from the upper end of each wall plate 14b. ing. On the bottom plate 14a, as will be described later, a mounting substrate 18 on which the LEDs 17 are mounted is disposed. The wall plate 14b is inclined so as to gradually spread outward from the lower side (back side) toward the upper side (front side). A portion surrounded by the upper end portion of the wall plate 14 b is an opening 14 d of the chassis 14. Therefore, in the present embodiment, the area of the opening 14d is larger than the area of the bottom plate 14a. The receiving plate 14c has a frame shape surrounding the opening 14d as a whole, and is a place on which the peripheral portions of the optical member 15 and the reflecting member 20 are placed. The receiving plate 14 c is a place where a frame 16 for supporting the liquid crystal panel 11 is placed. In each figure, the long side direction of the chassis 14 coincides with the X-axis direction, and the short side direction thereof coincides with the Y-axis direction.

  As shown in FIG. 2, the optical member 15 has a rectangular shape in plan view, like the liquid crystal panel 11 and the like. As shown in FIG. 3, the optical member 15 covers the opening 14 d of the chassis 14 with the peripheral edge thereof being placed on the receiving plate 14 c. That is, the optical member 15 is disposed between the liquid crystal panel 11 and the LED 17. The optical member 15 includes a diffusion plate 15a disposed on the back side (LED 17 side) and an optical sheet 15b disposed on the front side (liquid crystal panel 11 side). The diffusion plate 15a is made of a substantially transparent resin base material having a predetermined thickness, in which a large number of diffusion particles are dispersed and blended, and has a function of diffusing transmitted light. The optical sheet 15b has a sheet shape with a smaller thickness than the diffusion plate 15a. In the case of this embodiment, it is used in a state where two optical sheets 15b are laminated. Examples of the optical sheet 15b include a diffusion sheet, a lens sheet, a reflective polarizing sheet, and the like, and those appropriately selected from these are used. In the present embodiment, the diffusion plate 15a and the optical sheet 15b are set to the same size.

  As shown in FIG. 2, the frame 16 has a frame shape along the outer peripheral edge portions of the liquid crystal panel 11 and the optical member 15 and is made of a resin molded product. As shown in FIG. 3, the peripheral portion of the optical member 15 is sandwiched between the frame 16 and the receiving plate 14c. Further, the peripheral edge portion of the liquid crystal panel 11 is placed on the inner edge portion on the front side of the frame 16. The frame 16 holds the peripheral edge of the liquid crystal panel 11 together with the bezel 13 that covers the front side of the liquid crystal panel 11.

  An LED (Light Emitting Diode) 17 has a configuration in which an LED chip is sealed with a resin material on a substrate portion fixed to a mounting substrate 18 (so-called LED package). The LED chip mounted on the substrate part is composed of one having a main light emission wavelength, specifically, one emitting blue monochromatic light. In addition, a phosphor that converts blue light emitted from the LED chip into white light is dispersed and blended in the resin material for sealing the LED chip. That is, the LED 17 that emits white light is used. The LED 17 is a so-called top type in which a portion (light emitting portion) 17 a opposite to the mounting surface with respect to the mounting substrate 18 emits light. The optical axis LA of the LED 17 is set to coincide with the normal direction (Z-axis direction) of the liquid crystal panel 11. In addition, the light emitted from the LED 17 has a strong (high) directivity to some extent.

  FIG. 5 is a plan view of the mounting substrate 18. As shown in FIG. 5, the mounting substrate 18 has a rectangular shape in plan view as a whole. The mounting substrate 18 is fixed on the plate surface on the front side of the bottom plate 14 a so as to be arranged inside the wall plate 14 b of the chassis 14. The mounting board 18 has a long side disposed on the long side (wall plate 14 b 1 side) of the chassis 14, and a short side disposed on the short side (wall plate 14 b 2 side) of the chassis 14. Is housed inside. As shown in FIG. 5 and the like, the front side plate surface of the mounting substrate 18 is a mounting surface 18a on which the LEDs 17 and the like are mounted. In addition to the LED 17, a power supply unit 21 a that supplies power to the LED 17 and a signal unit 21 b that transmits a video signal (image data) to the liquid crystal panel 11 are mounted on the mounting surface 18 a. The mounting surface 18a includes an area (light source mounting area) S1 where the LED (light source) 17 is mounted, and other areas (outer areas) S2 and S3 located outside the area. In the present embodiment, the power supply unit 21a is mounted in the area S2, and the signal unit 21b is mounted in the area S3. Each unit 21 (21a, 21b) is composed of various electronic components (circuit components).

  As illustrated in FIG. 5, the mounting surface 18 a has a rectangular shape as a whole. The region S1 is assigned to the center side of the mounting surface 18a. Specifically, the region S1 is arranged at the center of the short side of the mounting surface 18a, and is arranged so as to cross the mounting surface 18a along the long side direction. In the case of the present embodiment, the region S1 has a rectangular shape that is elongated along the long side direction of the mounting surface 18a (mounting substrate 18). In the short side direction of the mounting surface 18a, the region S2 and the region S3 are respectively allocated on the mounting surface 18a so as to sandwich the region S1. In FIG. 5, the region S1 and the region S2 are separated by a boundary line L1 virtually drawn on the mounting surface 18a, and the region S1 and the region S2 are virtually on the mounting surface 18a. Is separated by a boundary line L2 drawn by.

  The region S1 is a portion secured as a range for mounting the LED (light source) 17 in the mounting surface 18a. This region S1 includes not only the portion (range) where the LED 17 itself is disposed, but also the periphery of that portion. A wiring pattern (for example, a wiring pattern made of a metal film such as a copper foil) 182 that is electrically connected to the LED 17 is formed on the mounting surface 18a around the LED 17, and such a wiring pattern is formed. The part (range) etc. which are performed are also contained in area | region S1. In short, the region S1 corresponds to the LED mounting surface of the LED substrate conventionally used in this type of lighting device.

  In the liquid crystal display device 10, the region S <b> 1 overlaps with a central portion of the liquid crystal panel 11 when viewed from the front side 11 a of the liquid crystal panel 11 disposed on the front side (for example, the upper side in FIG. 3) of the mounting substrate 18. Is set to That is, it can be said that the light source mounting region (region S1) is arranged on the center side of the liquid crystal panel (display panel). Further, the region S1 is set so as to overlap with the central portion of the bottom plate 14a of the chassis 14. That is, it can be said that the light source mounting region (region S1) is arranged on the center side of the chassis. The region S2 and the region S3 are arranged outside the region S1 in the liquid crystal display device 10. In the present embodiment, the regions S2 and S3 are arranged outside the mounting surface 18a.

  FIG. 6 is an enlarged cross-sectional view of the vicinity of the LED and the diffusing lens in FIG. The mounting board 18 includes a plate-like base material 180 having a rectangular shape in plan view. The base material 180 is made of the same metal material as the chassis 14 such as aluminum. An insulating layer (not shown) is formed on the surface of the substrate 180. That is, the surface of the substrate 180 on the front side (the liquid crystal panel 11 side) is covered with the insulating layer. A wiring pattern 182 made of a metal film such as a copper foil is formed on the insulating layer formed on the substrate 180. The wiring pattern 182 is electrically connected to the LED 17. Further, in order to cover and protect the wiring pattern 182, a white solder resist layer 181 is laminated on the insulating layer. The LED 17 is surface-mounted on the plate surface of the base material 180 on which the insulating layer is formed.

  In the region S1 of the mounting surface 18a, a plurality of LEDs 17 are mounted in a state of being aligned along the long side direction of the mounting substrate 18. In the region S1, two (two) LED rows are formed along the long side direction. Each LED row is composed of a plurality of LEDs 17 arranged in a row along the long side direction in a state where they are spaced from each other. The LEDs constituting the two LED rows are connected to each other in series by a wiring pattern 182. Note that two end portions (an end portion on the anode side and an end portion on the cathode side) of the wiring pattern 182 are each electrically connected to the power supply unit 21a. Then, power is supplied from the power supply unit 21 a to each LED 17 via the wiring pattern 182. That is, lighting / extinguishing of each LED 17 is collectively controlled by the power supply unit 21a.

  As described above, the power supply unit 21a is mounted in the region S2 of the mounting surface 18a. And this power supply unit 21a is comprised so that electric power may be supplied from an external power supply. The signal unit 21b mounted in the region S3 of the mounting surface 18a is electrically connected to the liquid crystal panel 11 via a predetermined wiring. However, the signal unit 21b is not electrically connected to the LED 17 and the power supply unit 21a mounted on the mounting substrate 18.

  The diffusing lens (optical lens) 19 is made of a synthetic resin material (for example, polycarbonate resin or acrylic resin) that is substantially transparent and has a high translucency and a refractive index higher than that of air. As shown in FIG. 4 and the like, the diffusing lens 19 has a substantially circular shape in a plan view, and covers each LED 17 on the mounting substrate 18 individually (that is, overlaps with the LED 17). It is attached to the mounting substrate 18. The diffusing lens 19 can emit light having high directivity (high) emitted from the LED 17 while diffusing. The diffusing lens 19 is disposed at a position that is substantially concentric with the LED 17 when seen in a plan view. The size of the diffusion lens 19 is set to be sufficiently larger than the LED 17.

  The surface of the diffusing lens 19 facing the mounting substrate 18 is a light incident surface 19a on which light from the LED 17 is incident. The surface of the diffusing lens 19 that faces the optical member 15 is a light emitting surface 19b that emits light. As shown in FIG. 6, the light incident surface 19 a has a shape arranged in parallel along the plate surface (mounting surface 18 a) of the mounting substrate 18 as a whole. The overlapping region is an inclined surface because the light incident side recess 19c is formed. The light incident side concave portion 19c has a substantially conical shape and is disposed at a substantially concentric position in the diffusing lens 19, and is open toward the back side (that is, the LED 17 side). The light incident side recess 19c has a substantially inverted V-shaped cross section, and its peripheral surface is an inclined surface inclined with respect to the optical axis LA (Z-axis direction). Therefore, the light emitted from the LED 17 and entering the light incident side recess 19c is incident on the diffusion lens 19 through the inclined surface. At that time, the light is refracted in a direction away from the center (that is, in a wide angle) by the amount of the inclination angle of the inclined surface with respect to the optical axis LA and is incident on the diffusion lens 19.

  The diffusing lens 19 is provided with mounting legs 19 d that project toward the mounting substrate 18 and serve as a structure for attaching the diffusing lens 19 to the mounting substrate 18. Three attachment legs 19d are arranged in the diffuser lens 19 at a position closer to the outer peripheral end than the light incident side recess 19c. And the line which connected those attachment parts has comprised the substantially equilateral triangle seeing in a plane. Each mounting leg portion 19d is fixed to the mounting substrate 18 at its tip end (attachment portion) with an adhesive or the like. The diffusing lens 19 is fixed to the mounting substrate 18 via the mounting leg portion 19d, so that a predetermined gap is provided between the light incident surface 19a and the mounting substrate 18. In this gap, light is allowed to enter from a space outside the diffusing lens 19 in a plan view.

  The light emission surface 19 is formed in a flat and substantially spherical shape. Thereby, the light emitted from the diffusion lens 19 is emitted while being refracted in a direction away from the center (that is, at a wide angle) at the interface with the external air layer. A light emitting side recess 19e is formed in a region of the light emitting surface 19b that overlaps the LED 17 when seen in a plan view. The light emitting side concave portion 19e has a substantially bowl shape, and is formed in a flat and substantially spherical shape with a peripheral surface having a downward slope toward the center. The angle formed by the tangent to the peripheral surface of the light exit side recess 19e with respect to the optical axis LA of the LED 17 is relatively larger than the angle formed by the inclined surface of the light incident side recess 19c with respect to the optical axis LA. Is set to By forming a light emission side recess 19e in a region of the light emission surface 19b that overlaps the LED 17 when viewed in plan, most of the light from the LED 17 is emitted while being refracted at a wide angle, or part of the light from the LED 17 Can be reflected to the mounting substrate 18 side.

  The reflection member 20 generally has a box shape (container shape) with an upper side (the liquid crystal panel 11 side) opened, and has a rectangular shape when viewed from above, as with the chassis 14. The reflecting member 20 is made of a synthetic resin reflecting sheet excellent in light reflectivity and processed into a predetermined shape. As the reflection sheet, for example, a white foamed polyethylene terephthalate sheet is used. As shown in FIG. 4, the reflecting member 20 has a size that is laid over substantially the entire inner surface of the chassis 14. The reflecting member 20 can efficiently start up by reflecting the light in the chassis 14 toward the optical member 15 side (the liquid crystal panel 11 side).

  The reflecting member 20 includes a reflecting bottom portion 20a, a reflecting wall portion 20b on the long side, a reflecting wall portion 20c on the short side, and an extending portion 20d. The reflective bottom portion 20a extends along the mounting surface 18a of the mounting substrate 18 disposed on the bottom plate 14a of the chassis 14 and has a size that covers the region S1 of the mounting surface 18a. The reflective bottom portion 20a is arranged so as to overlap the region S1 of the mounting surface 18 on which the LEDs 17 are mounted. As shown in FIG. 4, the reflection bottom portion 20 a has a rectangular shape extending in the long side direction of the chassis 14. The reflection bottom 20a is provided with a plurality of insertion holes 20e through which the diffusion lens 19 and the LEDs 17 are inserted, and each LED 17 on the mounting substrate 18 is exposed to the front side from the insertion hole 20e. The reflective bottom portion 20a is fixed to the mounting substrate 18 and the bottom plate 14a while being positioned using a rivet-like fixing means (not shown). Further, neither the region S2 nor the region S3 of the mounting substrate 18 is covered with the reflection bottom portion 20a.

  Reflecting wall portions 20b and 20c rise from the four ends of the reflective bottom portion 20a toward the front side (the liquid crystal panel 11 side). As shown in FIG. 3, the two long side reflection walls 20b rise from the long side end of the reflection bottom 20a toward the upper end of the wall plate 14b1, respectively. That is, the reflection wall portion 20b is inclined so as to rise from the long side end portion of the reflection bottom portion 20a toward the upper end side of the wall plate 14b1. A space surrounded by the reflective wall portion 20b, the wall plate 14b1, and the region (outer region) S2 on the mounting substrate 18 (the bottom plate 14a disposed on the back side of the region S2). Ma is formed. In this space Ma, the power supply unit 21a is accommodated in a form mounted on the region S2 of the mounting substrate 18. Further, the other reflection wall portion 20b, the wall plate 14b1, and the region (outside region) S3 (the bottom plate 14a disposed on the back side of the region S3) on the mounting substrate 18 are also surrounded by these. A space Mb is formed. In this space Mb, the signal unit 21b is accommodated in a form mounted on the region S3 of the mounting substrate 18.

  Further, as shown in FIGS. 2 and 4, the two reflecting walls 20c on the short side rise from the end on the short side of the reflecting bottom 20a toward the upper end of the wall plate 14b2. Each of the reflection walls 20c on the short side is connected to the adjacent reflection wall 20b on the long side so that no gap is formed.

  The extending portion 20d is a portion extending outward from the end portions of the reflecting wall portions 20b and 20c, and is disposed in parallel to the bottom plate 14a of the chassis 14 and the like. The extension portion 20d has a frame shape that surrounds the reflection bottom portion 20a and the reflection wall portions 20b and 20c as a whole when the reflection member 20 is viewed in plan view. The extending portion 20 d is a portion that is placed on the receiving plate 14 c of the chassis 14, and is a portion that is sandwiched between the receiving plate 14 and the frame 16.

  The insertion hole 20e is provided as a circular opening at a position where the diffusing lens 19 (and the LED 17) overlaps the reflection bottom 20a in plan view. The same number of insertion holes 20e as the number of LEDs 17 mounted on the region S1 of the mounting substrate 18 are provided in the reflective bottom portion 20a. As shown in FIG. 4, the insertion hole 20 e is set larger than the diffusing lens 19. As a result, when the reflecting member 20 is laid in the chassis 14, each diffusion lens 19 can be reliably inserted into each insertion hole 20 e regardless of the presence or absence of a dimensional error. As shown in FIG. 6, a part of the white solder resist layer 181 on the mounting substrate 18 is exposed from the insertion hole 20e.

  Here, a procedure for assembling the liquid crystal display device 10 will be described. First, the chassis 14 is prepared, and the mounting substrate 18 (light source unit) on which the LEDs 17, the power supply unit 21a, and the signal unit 21b are mounted in predetermined regions is prepared. Then, the mounting substrate 18 is attached on the bottom plate 14 a of the chassis 14. Thereafter, the reflection member 20 is attached to the chassis 14 so as to cover the mounting substrate 18 accommodated in the chassis 14. At that time, the reflection bottom portion 20a of the reflection member 20 is overlaid on the region S1 where the LED 17 is mounted, and each diffusion lens 19 (LED 17) is inserted into each insertion hole 20e provided in the reflection bottom portion 20a. . Thereafter, the optical member 15 and the frame 16 are placed on the receiving plate 14c of the chassis 14, respectively. Then, the liquid crystal panel 11 is placed on the frame 16, and the bezel 13 is attached to the chassis 14 so that the liquid crystal panel 11 is sandwiched between the frame 16.

  When the power of the liquid crystal display device 10 is turned on (that is, turned on), power is supplied from the power supply unit 21a to each LED 17 on the mounting board 18, each LED 17 is turned on, and the liquid crystal is output from the signal unit 21b. A video signal (image data) is supplied to the panel 11. The light emitted from each LED 17 first enters the light incident surface 19 a of the diffusion lens 19. At this time, most of the light enters the inclined surface of the light incident recess 19c in the light incident surface 19a, and enters the diffusing lens 19 while being refracted at a wide angle according to the inclination angle. The light that has entered the diffusing lens 19 propagates through the diffusing lens 19 and then exits from the light exit surface 19b. The light emitting surface 19b has a flat and substantially spherical shape, and light is emitted while being refracted at a wider angle at the interface with the external air layer. A light emitting side concave portion 19e having a substantially bowl shape is formed in a region where the amount of light from the LED 17 is the largest in the light emitting surface 19b, and the peripheral surface has a flat and substantially spherical shape. Therefore, the light can be emitted while being refracted at a wide angle on the peripheral surface of the light emitting side recess 19e, or can be reflected to the mounting substrate 18 side.

  The light emitted from the diffusing lens 19 is directed to the optical member 15 side (the liquid crystal panel 11 side) as it is or after being reflected by the reflecting member 20 or the like. Then, the light passes through the optical member 15 and passes through the inner edge portion of the frame 16 to illuminate the back surface 11 b of the liquid crystal panel 11 as a planar light that spreads out uniformly. Note that the light reflected on the mounting substrate 18 side by the peripheral surface of the light emitting side recess 19e described above is also reflected by the mounting substrate 18, the reflecting member 20, and the like, and finally the back surface 11b of the liquid crystal panel 11 It becomes the light which irradiates. Thus, when the light is irradiated on the back surface 11b of the liquid crystal panel 11, an image (video) based on the video signal appears on the display surface 11a as a visible image.

  The liquid crystal display device 10 (backlight device 12) of the present embodiment includes a mounting substrate 18 disposed on the bottom plate 14a of the chassis 14 in a form disposed on the inside of the wall plate 14b of the chassis 14. The mounting surface 18a of the mounting substrate 18 includes a light source mounting area S1 on the center side where the LED (light source) 17 is mounted and outer areas S2 and S3 arranged outside the light source mounting area S1. A part of the reflection member 20 that reflects light from the LED (light source) 17 is disposed on the mounting surface 18a. This part is the reflection bottom part 20a which covers light source mounting area | region S1, including the penetration hole (hole part) 20e which exposes LED (light source) 17. FIG. Moreover, the reflection member 20 has the reflection wall part 20b as another part. The reflective wall portion 20b rises from the reflective bottom portion 20a toward the wall plate 14b1 so as to form spaces Ma and Mb together with the wall plate 14b (14b1) and the outer regions S2 and S3. In the liquid crystal display device 10 (backlight device 12) of the present embodiment, the power supply unit 21a and the signal unit 21b each including circuit components are the outer regions of the mounting substrate 18 on which the LED (light source) 17 is mounted. In addition to being mounted in S2 and S2, they are arranged in the spaces Ma and Mb, respectively. Therefore, in the liquid crystal display device 10 (backlight device 12) of the present embodiment, the power supply unit 21a and the signal unit 21b including the circuit components can be arranged in the spaces Ma and Mb in the chassis 14, The structure can be reduced in size. For example, as compared with the case where the power supply unit 21a and the signal unit 21b are mounted on the other substrate and attached to the outside (back side) of the chassis 14 as in the past, for example, the liquid crystal of this embodiment is used. It can be said that the display device 10 (backlight device 12) has a structure that can be reduced in size (particularly, a structure that can be reduced in the thickness direction).

  Furthermore, in the liquid crystal display device 10 (backlight device 12) of the present embodiment, the power supply unit 21a including the circuit components is provided if the mounting substrate 18 on which the LED (light source) 17 is mounted is disposed on the bottom plate 14a. And the signal unit 21b can be easily arranged in the spaces Ma and Mb formed at predetermined positions in the chassis 14. That is, on the mounting surface 18a of the mounting substrate 18, a region (light source mounting region) S1 for mounting the LED (light source) 17 and outer regions S2 and S3 arranged outside them are respectively assigned in advance. Thus, when the liquid crystal display device 10 (backlight device 12) is assembled, the power supply unit 21a and the signal unit 21b can be easily provided at predetermined locations of the chassis 14 (that is, locations where spaces Ma and Mb are finally formed). Can be placed (positioned) together.

  For example, when the LED 17, the power supply unit 21 a, and the signal unit 21 b are mounted on separate substrates (substrate pieces), the assembly man-hours and the number of parts of the liquid crystal display device (illumination device) increase, which is a problem. End up. However, like the liquid crystal display device 10 (backlight device 12) of this embodiment, the LED 17, the power supply unit 21a, and the signal unit 21b are respectively provided on the mounting surface 18a on a single substrate (mounting substrate 18). If they are mounted together in a state assigned to a location, the number of assembly steps and the number of parts can be reduced as compared with the case described above.

  In the liquid crystal display device 10 (backlight device 12) of the present embodiment, a power supply unit (LED driver) 21a that supplies power to the LEDs 17 is mounted in the outer region S2 of the mounting substrate 18. The power supply unit 21a is arranged close to the LED 17 in terms of a circuit. In this way, circuit components arranged close to the LED 17 in terms of a circuit may be collectively mounted on the substrate (mounting substrate 18) on which the LED 17 is mounted. In addition, a signal unit 21 b that supplies a video signal to the liquid crystal panel 11 is mounted on the outer region S3 of the mounting substrate 18. This signal unit 21 b is not electrically connected to the LED 17. In this way, circuit components that are not electrically connected to the LEDs 17 may be collectively mounted on the substrate (mounting substrate 18) on which the LEDs 17 are mounted. As described above, after various circuit components are mounted on the same mounting substrate 18 as the LED 17, the spaces (spaces Ma and Mb) formed in the chassis 14 are effectively utilized as spaces for accommodating the circuit components. May be.

  In the liquid crystal display device 10 (backlight device 12) of the present embodiment, a plurality of LEDs 17 are mounted on the mounting substrate 18 as light sources. Thus, when the LED 17 is used as the light source, for example, there is an advantage that the liquid crystal display device 10 (backlight device 12) can be easily assembled as compared with the case where a cold cathode tube (CCFL) is used as the light source. When the backlight device 12 is assembled, the reflection member 20 (reflection bottom portion 20a) is mounted on the mounting substrate 18 after the mounting substrate 18 on which the LEDs 17 are mounted is installed in the chassis 14. On the other hand, when the light source is a cold cathode tube, the mounting substrate is installed in the chassis, a reflective member (reflective bottom) is attached on the mounting substrate, and the cold cathode tube attaches the reflective member. To the implementation board. That is, when the light source is formed of a cold cathode tube, the mounting substrate cannot be attached to a predetermined portion of the chassis after the light source (cold cathode tube) is previously attached to the mounting substrate. Moreover, the light source (cold cathode tube) is attached to the mounting substrate after the reflection member is installed on the mounting substrate. Therefore, when the light source is formed of a cold cathode tube, the mounting operation of the mounting substrate to the chassis, the mounting operation of the reflecting member to the chassis, and the like are complicated compared to the case where the light source is formed of the LEDs 17. Even when the light source is formed of a cold cathode tube, it is conceivable to form an opening (insertion hole) for exposing the light source to the reflecting member. However, when the light source is formed of a cold cathode tube, it is not preferable to form an opening that exposes the light source in the reflecting member, because the light reflection efficiency on the mounting substrate is lowered.

<Embodiment 2>
Next, Embodiment 2 of the present invention will be described with reference to FIG. In the following embodiments, the same parts as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and detailed description thereof is omitted. FIG. 7 is a cross-sectional view of the liquid crystal display device 10A according to the second embodiment. The cross-sectional view of the liquid crystal display device 10A shown in FIG. 7 corresponds to the cross-sectional view of the first embodiment shown in FIG. The liquid crystal display device 10A of this embodiment includes a backlight device 12A. The basic configuration of the backlight device 12A is the same as that of the first embodiment. However, the backlight device 12A of the present embodiment is different from that of the first embodiment in the structure of the mounting substrate 18A. Specifically, the LED 17 and a power supply unit (LED driver) 21a that supplies power to the LED 17 are mounted on the mounting substrate 18A, but a signal that supplies a video signal to the liquid crystal panel 11. A unit (corresponding to the signal unit 21b of the first embodiment) is not mounted. Then, the size of the mounting substrate 18A is set to about one third of that of the first embodiment. On the mounting surface 18Aa of the mounting substrate 18A, a light source mounting area S1 where the LEDs 17 are mounted and an outer area S2 where the power supply unit 21a is mounted are allocated. Similar to the first embodiment, the region S1 on the mounting substrate 18A is set so as to overlap the central portion of the liquid crystal panel 11 when the liquid crystal display device 10A is viewed in plan. In the liquid crystal display device 10A (backlight device 12A) of the present embodiment, the signal unit is mounted on a dedicated substrate (not shown), and the outside of the chassis 14 (the plate surface on the back side of the bottom plate 14a). Side).

  Like the liquid crystal display device 10 </ b> A (backlight device 12 </ b> A) of the present embodiment, only the power supply unit 21 a may be mounted on the mounting substrate 18 in addition to the LEDs 17. Even in such a case, the reflecting wall portion 20b of the reflecting member 20, the wall plate 14b1, and the outer region S2 (mounting surface 18Aa) of the mounting substrate 18A (the bottom plate 14a disposed on the back side of the outer region S1). At least the power supply unit 21a can be accommodated in the space Ma surrounded by and the space formed in the chassis 14 can be used effectively. Even in the case of the present embodiment, the mounting board 18A is installed at a predetermined position of the chassis 14 (that is, a position in the chassis 14 where each LED 17 is arranged at the central portion of the bottom plate 14a). The power supply unit 21a on the outer region S2 can be easily disposed at a place where the space Ma is formed.

<Embodiment 3>
Next, Embodiment 3 of the present invention will be described with reference to FIG. FIG. 8 is a cross-sectional view illustrating a schematic configuration of a liquid crystal display device 10B according to the third embodiment. The cross-sectional view of the liquid crystal display device 10B shown in FIG. 8 corresponds to the cross-sectional view of the first embodiment shown in FIG. The liquid crystal display device 10B of the present embodiment includes an illumination device 10B. The basic configuration of the backlight device 12B is the same as that of the first embodiment. However, the backlight device 12B of this embodiment is different from that of Embodiment 1 in the structure of Embodiment 18B. Specifically, as in the first embodiment, a plurality of LEDs 17 are mounted on the light source mounting area S1 on the mounting surface 18Ba on the mounting substrate 18B, as in the first embodiment. However, in the outer region S2 of the mounting surface 18Ba of the mounting substrate 18B, a substrate (substrate piece) 22a on which the power supply unit 21a is mounted is set while being set to be approximately the same size as the outer region S2. ing. The power supply unit 21a is mounted on another substrate 22a located above the outer region S2. In addition, a substrate (substrate piece) 22b on which the signal unit 21b is mounted is placed on the outer region S3, which is set to be approximately the same size as the outer region S3. The signal unit 21b is mounted on another substrate 22b above the outer region S3. These substrates 22a and 22b are fixed on the respective regions S2 and S3 of the mounting substrate 18B using an adhesive or the like. Each LED 17 mounted on the mounting board 18B and the power supply unit 21a mounted on the board 22a are connected via a predetermined relay connector. They are electrically connected to each other using electrical wiring (for example, a conductive wire and an insulating layer covering the periphery of the conductive wire).

  Like the liquid crystal display device 10B (backlight device 12B) of the present embodiment, the power supply unit 21a and the signal unit 21b may not be directly mounted on the mounting substrate 18B, respectively. If the power supply unit 21a and the signal unit 21b are respectively arranged (installed) on at least the outer regions S2 and S3 of the mounting substrate 18B as in the present embodiment, the mounting is the same as in the first embodiment. By simply attaching the board 18B to a predetermined location of the chassis 14, the power supply unit 21a and the signal unit 21b can be easily arranged at locations where spaces Ma and Mb are formed, respectively.

<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 above embodiment, the power supply unit and the signal unit are exemplified as the circuit components mounted on the outer region on the mounting surface of the mounting board. However, other circuit components may be mounted on the outer region. .

  (2) In the above embodiment, the diffusion lens (optical lens) is attached so as to cover the LED. However, in other embodiments, a configuration in which the diffusion lens is not used may be used.

  (3) In the said embodiment, although LED was utilized as a light source, in other embodiment, light sources other than LED may be utilized.

  (4) In the above embodiment, the plurality of LEDs are arranged in a line on the light source mounting region of the mounting substrate. However, the present invention is not limited to this.

  (5) In each of the above-described embodiments, the plurality of LEDs mounted on the mounting substrate are connected in series with each other by a predetermined wiring pattern. However, in other embodiments, this is limited to this. It is not a thing. For example, in other embodiments, the LEDs on the mounting board may be connected in parallel to each other using a predetermined wiring pattern. And you may perform a local dimming with respect to said LED using a power supply unit (LED driver). Thus, by performing current control of each LED by the power supply unit, contrast improvement (adjustment) of the backlight device (illumination device), suppression of power consumption, backlight scanning, and the like may be performed.

  (6) In addition to the above-described embodiments, the number and arrangement of light sources (LEDs) mounted in the light source mounting area of the mounting board, and the light source mounting area and the outer area allocation method on the mounting surface of the mounting board are appropriately Can be polarized.

  (7) In the above embodiment, the mounting substrate has a rectangular shape in plan view, but in other embodiments, a predetermined light source mounting area and an outer area are allocated on the mounting surface, respectively. If it is a thing, the shape of a mounting substrate does not need to be a rectangular shape.

  (8) In each of the embodiments described above, a TFT is used as a switching element of a liquid crystal display device. However, the present invention can also be applied to a liquid crystal display device using a switching element other than TFT (for example, a thin film diode (TFD)). is there. Further, in each of the above-described embodiments, the liquid crystal display device that performs color display is exemplified, but the present invention can also be applied to a liquid crystal display device that performs monochrome display.

  (9) In each of the above-described embodiments, the liquid crystal display device using the liquid crystal panel as the display panel has been exemplified. However, the present invention can also be applied to display devices using other types of display panels.

  (10) In each of the embodiments described above, the television receiver provided with the tuner is exemplified, but the present invention can also be applied to a display device not provided with the tuner.

  DESCRIPTION OF SYMBOLS 10,10A, 10B ... Liquid crystal display device (display device), 11 ... Liquid crystal panel (display panel), 12, 12A, 12B ... Backlight device (illumination device), 13 ... Bezel, 14 ... Chassis, 14a ... Bottom plate, 14b DESCRIPTION OF SYMBOLS ... Wall board, 14c ... Receiver board, 14d ... Opening part, 15 ... Optical member, 15a ... Diffusing plate, 15b ... Optical sheet, 16 ... Frame, 17 ... LED (light source), 18, 18A, 18B ... Mounting board, 18a , 18Aa, 18Ba ... mounting surface, 19 ... diffuse lens (optical lens), 20 ... reflective member, 20a ... reflective bottom, 20b ... reflective wall (long side), 20c ... reflective wall (short side), 20d ... Extension part, 20e ... Insertion hole (hole part), 21a ... Power supply unit (circuit part), 21b ... Signal unit (circuit part), 22a, 22b ... Substrate piece, TV ... Television receiver

Claims (13)

A light source;
A chassis having a bottom plate and a wall plate rising from the periphery of the bottom plate;
The bottom plate has a mounting surface including a light source mounting region disposed on the center side where the light source is mounted and an outer region disposed outside the light source mounting region, and is disposed inside the wall plate. A mounting board disposed above,
A reflective bottom portion that is disposed on the mounting surface so as to cover the light source mounting region while including a hole portion that exposes the light source, and that forms a space together with the wall plate and the outer region. A reflection member having a reflection wall portion that rises from the reflection bottom portion toward the wall plate and reflects the light;
And a circuit component mounted in the outer region and disposed in the space.   The lighting device according to claim 1, wherein the mounting substrate is a single substrate.   The lighting device according to claim 1, wherein the circuit component is electrically connected to the light source.   The lighting device according to claim 3, wherein the mounting board has a wiring pattern that electrically connects the circuit component and the light source.   The lighting device according to claim 3, wherein the circuit component supplies power to the light source. The mounting board has a rectangular shape,
The light source mounting region is disposed in a central portion of the mounting surface along one side direction of the mounting substrate,
The outer region includes two portions arranged along the one side direction so as to sandwich the light source mounting region,
The lighting device according to claim 1, wherein the circuit component is mounted on each of two portions of the outer region. An optical lens that is provided on the mounting surface so as to face the light source and transmits light from the light source,
The illumination device according to any one of claims 1 to 6, wherein the hole portion exposes the optical lens together with the light source.   The lighting device according to any one of claims 1 to 7, wherein the reflection wall portion rises while being inclined from the reflection bottom portion toward the wall plate.   The lighting device according to any one of claims 1 to 8, wherein the light source includes a plurality of LED light sources.   A display device comprising: the illumination device according to claim 1; and a display panel that performs display using light from the illumination device.   The display device according to claim 10, wherein the circuit component transmits an image signal to the display panel.   The display device according to claim 10, 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 any one of claims 10 to 12.

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