JP2013143217A - Lighting device, display device and television receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve luminance in an outer circumference of a display device without arranging a light source separately.SOLUTION: The backlight device includes a plurality of LEDs 28, an LED substrate 30 having a plurality of LEDs 28 installed on a plate surface, a chassis 22 which has a bottom plate 22a of rectangular shape in a plan view, and has the LED substrate 30 installed on the bottom plate 22a with the LEDs 28 exposed, a reflection sheet 20 which is installed straddling over the LED substrate 30 and the bottom plate 22a, and has a bottom part 20a that extends along the plate surface of the bottom plate 22a and covers a large portion of the bottom plate 22a, and a rising part 20b1 which rises from the outer end of the bottom part 20a to the light emitting side of the LED 28 and inclines against the bottom part 20a, and a projection piece 34 which is arranged on the rising part 20b and projects to the light-emitting side of the LED 28, and has an exposed surface to be exposed to both of the LED 28 side and the light-emitting side of the LED 28 to reflect light.

Description

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

  In recent years, display elements of image display devices such as television receivers are shifting from conventional cathode ray tubes to thin display devices to which thin display elements such as liquid crystal panels and plasma display panels are applied. Is possible. The liquid crystal display device requires a backlight device as a separate illumination device because the liquid crystal panel used for this does not emit light. As an example of such a backlight device, a direct-type backlight device that directly supplies light from the back surface to a liquid crystal panel is known.

  In a direct type backlight device, a reflection sheet for reflecting light emitted from a light source and directed to the opposite side of the display surface to the display surface side is laid on the light source substrate and on the bottom plate of the chassis as a casing. The configuration is known. In the backlight device having such a configuration, the outer peripheral portion of the reflection sheet is usually inclined to rise toward the light emission side of the light source.

  By the way, when LED is arranged as a light source in a direct type backlight device having a reflection sheet as described above, the LED overlaps with the outer peripheral portion of the bottom plate of the chassis on the display surface of the liquid crystal panel because of the LED arrangement. Since the light from the light reaches only from one direction or two directions, the amount of light reaching the liquid crystal panel is small. For this reason, the outer peripheral part of the display surface of a liquid crystal panel may be displayed darkly.

  For example, Patent Literature 1 discloses a backlight device that can suppress the outer peripheral portion of the display surface of a liquid crystal panel from being displayed darkly. This backlight device is configured such that a plurality of cold cathode fluorescent lamps are arranged in parallel on the bottom plate of the chassis, and LEDs are arranged behind the four corners of the liquid crystal panel. In this backlight device, the LEDs are arranged behind the four corners of the liquid crystal panel, so that the luminance of the portion overlapping the four corners of the liquid crystal panel in the outer peripheral portion of the display surface of the liquid crystal panel is improved. Thereby, the brightness | luminance in the outer peripheral part of the display surface of a liquid crystal panel improves, and it suppresses that an outer peripheral part is displayed darkly.

JP 2010-210750 A

  However, in the backlight device of the above-mentioned Patent Document 1, only the brightness of the portion overlapping the four corners of the liquid crystal panel in the outer peripheral portion of the display surface of the liquid crystal panel is improved. It is impossible to improve the brightness of the dark part. That is, the luminance cannot be improved over the entire outer periphery of the display surface of the liquid crystal panel. Furthermore, since separate LEDs are required behind the four corners of the liquid crystal panel, the member cost increases and the manufacturing process becomes complicated.

  The technology disclosed in this specification has been created in view of the above problems. An object of the technology disclosed in the present specification is to provide a direct-type illumination device capable of improving the luminance at the outer peripheral portion of the display surface without separately providing a light source.

  The technology disclosed in the present specification includes a plurality of light sources, a light source substrate on which a plurality of the light sources are attached on a plate surface, and a plate-shaped portion that has at least a rectangular shape in plan view, and exposes the light sources. A chassis in which the light source board is mounted on the plate-like part, and a light source insertion in which the light source is inserted into a portion that is laid over the light source board and the plate-like part and overlaps the light source A hole is provided, extends along the plate surface of the plate-like portion and covers a large portion of the plate-like portion, and rises from the outer end of the bottom portion to the light emitting side of the light source. A reflection sheet having a rising portion that is inclined with respect to the bottom; and a protrusion disposed on the rising portion, protruding to the light emission side of the light source; and at least the light source side and the light emission side of the light source; Reflects light exposed to both A projecting piece having an exposed surface that relates to a lighting device comprising a.

  According to such an illumination device, since the protruding piece is arranged so as to protrude from the rising portion, the light emitted from the light source arranged in the vicinity of the rising portion and reflected by the exposed surface of the protruding piece is The light is directed more directly from the reflection portion than when reflected by the surface of the rising portion. For this reason, the brightness of the display surface immediately above the rising portion can be improved, and the brightness at the outer peripheral portion of the display surface can be improved.

The protruding piece has a contact surface that contacts the rising portion and an inclined surface that corresponds to the exposed surface and has an inclination angle larger than the inclination angle of the rising portion, and has a triangular shape in a cross-sectional view. May be.
According to this configuration, a specific shape of the protruding piece can be realized according to the characteristics of the light emitted from the light source.

The projection piece may have an abutting surface that abuts on the rising portion and a curved surface corresponding to the exposed surface, and may have an arch shape in a cross-sectional view.
According to this configuration, a specific shape of the protruding piece can be realized according to the characteristics of the light emitted from the light source.

A plurality of the protruding pieces may be arranged from the rising base end of the rising portion to the rising tip.
According to this configuration, the light emitted from the light source disposed in the vicinity of the rising portion can be effectively reflected directly above the rising portion by the exposed surfaces of the plurality of protruding pieces. Thereby, the brightness | luminance in the outer peripheral part of a display surface can be improved further.

The light source is a light source having directional characteristics, and intervals between the plurality of projection pieces may be adjusted according to the directional characteristics of the light source.
According to this configuration, it is possible to effectively reflect the light emitted from the light source disposed in the vicinity of the rising portion directly above the rising portion.

The light source is a light source having directional characteristics, and the size of the plurality of protruding pieces may be adjusted according to the directional characteristics of the light source.
According to this configuration, it is possible to effectively reflect the light emitted from the light source disposed in the vicinity of the rising portion directly above the rising portion.

The rising portion and the protruding piece may be made of plastic.
According to this configuration, the rising portion and the protruding piece can be easily formed, and the rigidity of both can be increased.

The rising portion and the protruding piece may be integrally formed.
According to this configuration, the reflective sheet and the protruding piece can be easily formed, and the manufacturing process can be simplified.

  The technology disclosed in this specification can also be expressed as a display device including a display panel that performs display using light from the above-described lighting device. A display device in which the display panel is a liquid crystal panel using liquid crystal is also new and useful. A television receiver provided with the above display device is also new and useful.

  According to the technology disclosed in this specification, it is possible to provide a direct-type illumination device capable of improving the luminance at the outer peripheral portion of the display surface without separately providing a light source.

1 is an exploded perspective view of a television receiver TV according to Embodiment 1. FIG. Disassembled perspective view of the liquid crystal display device 10 Plan view of the backlight device 24 FIG. 4 is a cross-sectional view taken along the line iv-iv in FIG. 3, and is a cross-sectional view along the long side direction of the backlight device 24. In FIG. 4, an enlarged sectional view in which the vicinity of the rising portion 20b is enlarged. In the second embodiment, an enlarged cross-sectional view in which the vicinity of the rising portion 120b is enlarged In embodiment 3, the expanded sectional view which expanded rising part 220b neighborhood In embodiment 4, the expanded sectional view which expanded the rising part 320b vicinity

<Embodiment 1>
Embodiment 1 will be described with reference to the drawings. In this embodiment, the liquid crystal display device 10 is illustrated. In addition, a part of each drawing shows an X axis, a Y axis, and a Z axis, and each axis direction is drawn to be a direction shown in each drawing. Also, the upper side shown in FIG. 2 is the front side, and the lower side is the back side.

(TV receiver)
As shown in FIG. 1, the television receiver TV according to this embodiment includes a liquid crystal display device 10 that is a display device, front and back cabinets Ca and Cb that are accommodated so as to sandwich the liquid crystal display device 10, and power supply. Power supply circuit board P, a tuner (receiving unit) T capable of receiving a TV image signal, an image conversion circuit board VC for converting the TV image signal output from the tuner T into an image signal for the liquid crystal display device 10 And a stand S.

  The liquid crystal display device 10 has a horizontally long (longitudinal) rectangular shape (rectangular shape) as a whole, the long side direction is the horizontal direction (X-axis direction), and the short side direction is the vertical direction (Y-axis direction, vertical direction). They are housed in a matched state. As shown in FIG. 2, the liquid crystal display device 10 includes a liquid crystal panel 16 that is a display panel, and a backlight device (an example of a lighting device) 24 that is an external light source. It is designed to be held together.

(LCD panel)
The liquid crystal panel 16 has a configuration in which a pair of transparent (highly translucent) glass substrates are bonded together with a predetermined gap therebetween, and a liquid crystal layer (not shown) is sealed between the glass substrates. Is done. One glass substrate is provided with a switching element (for example, TFT) connected to a source wiring and a gate wiring orthogonal to each other, a pixel electrode connected to the switching element, an alignment film, and the like. The substrate is provided with a color filter and counter electrodes in which colored portions such as R (red), G (green), and B (blue) are arranged in a predetermined arrangement, and an alignment film. Of these, image data and various control signals necessary for displaying an image are supplied to a source wiring, a gate wiring, a counter electrode, and the like from a drive circuit board (not shown). A polarizing plate (not shown) is disposed outside both glass substrates.

(Backlight device)
Next, the configuration of the backlight device 24 in the liquid crystal display device 10 will be described. As shown in FIG. 2, the backlight device 24 includes a substantially box-shaped chassis 22, an optical member 18 arranged to cover the light emitting surface side (the liquid crystal panel 16 side), and an outer edge portion of the chassis 22. And a frame 14 that is disposed along the outer end of the optical member 18 with the chassis 22 therebetween. Further, as shown in FIGS. 4 and 5, an LED (an example of a light source) 28 and an LED 28 are mounted in the chassis 22 so as to face each other at a position directly below the optical member 18 (the liquid crystal panel 16). The LED board 30 and the diffusion lens 27 attached to the LED board 30 at a position corresponding to the LED 28 are provided. Thus, the backlight device 24 according to the present embodiment is a so-called direct type. In addition, a support member 26 that can support the optical member 18 and a reflection sheet 20 that reflects light in the chassis 22 toward the optical member 18 are provided in the chassis 22. Subsequently, each component of the backlight device 24 will be described in detail.

(Chassis)
The chassis 22 is made of metal, and as shown in FIGS. 3 and 4, a bottom plate (an example of a plate-like portion) 22a having a horizontally long rectangular shape (rectangular shape, rectangular shape), like the liquid crystal panel 16, and a bottom plate The side plate 22b rises from the end of each side (a pair of long sides and a pair of short sides) 22b toward the front side (light emission side), and as a whole, a shallow substantially box shape opened toward the front side. There is no. The long side direction of the chassis 22 coincides with the X-axis direction (horizontal direction), and the short side direction coincides with the Y-axis direction (vertical direction). The frame 14 and the optical member 18 described below can be placed on each receiving plate 22c in the chassis 22 from the front side. The frame 14 is screwed to each receiving plate 22c. The bottom plate 22a of the chassis 22 is provided with an attachment hole (not shown) for attaching the support member 26. A plurality of mounting holes are arranged in a distributed manner corresponding to the mounting position of the support member 26 on the bottom plate 22a.

(Optical member)
As shown in FIG. 2, the optical member 18 has a horizontally long rectangular shape in a plan view, like the liquid crystal panel 16 and the chassis 22. As shown in FIG. 4, the optical member 18 has its outer edge portion placed on the receiving plate 22c so as to cover the light emission side of the LED 28 and between the liquid crystal panel 16 and the diffusion lens 27 (LED substrate 30). Intervened. The optical member 18 includes a diffusion plate 18a disposed on the back side (diffuse lens 27 side, opposite to the light emission side) and an optical sheet 18b disposed on the front side (liquid crystal panel 16 side, light emission side). Is done. The diffusing plate 18a is configured to have a large number of diffusing particles dispersed in a plate-like base material made of a substantially transparent resin having a predetermined thickness, and has a function of diffusing transmitted light. The optical sheet 18b has a sheet shape that is thinner than the diffusion plate 18a, and two optical sheets 18b are stacked. Specific types of the optical sheet 18b include, for example, a diffusion sheet, a lens sheet, a reflective polarizing sheet, and the like, which can be appropriately selected and used.

(flame)
As shown in FIG. 2, the frame 14 has a frame shape along the outer peripheral edges of the liquid crystal panel 16 and the optical sheet 18b. An outer edge portion of the optical member 18 can be sandwiched between the frame 14 and each receiving plate 22c (see FIG. 4). The frame 14 can receive the outer edge portion of the liquid crystal panel 16 from the back side, and can sandwich the outer edge portion of the liquid crystal panel 16 with the bezel 12 arranged on the front side (see FIG. 4).

(LED)
The LED 28 is mounted on an LED substrate (an example of a light source substrate) 30 and is a so-called top type in which a surface opposite to the mounting surface with respect to the LED 28 is a light emitting surface. The LED 28 includes an LED chip (not shown) that emits blue light as a light source, and also includes a green phosphor and a red phosphor as phosphors that emit light when excited by blue light. Specifically, the LED 28 is configured such that an LED chip made of, for example, an InGaN-based material is sealed with a resin material on a substrate portion fixed to the LED substrate 30. The LED chip mounted on the substrate unit has a main emission wavelength in the range of 420 nm to 500 nm, that is, in the blue wavelength region, and can emit blue light (blue monochromatic light) with excellent color purity. Is done. As a specific main emission wavelength of the LED chip, for example, 451 nm is preferable. On the other hand, the resin material that seals the LED chip is excited by the blue phosphor emitted from the LED chip and the green phosphor that emits green light by being excited by the blue light emitted from the LED chip. And a red phosphor emitting red light is dispersed and blended at a predetermined ratio. The LED 28 emits blue light (blue component light) emitted from these LED chips, green light (green component light) emitted from the green phosphor, and red light (red component light) emitted from the red phosphor. Is capable of emitting light of a predetermined color as a whole, for example, white or blueish white. Since yellow light is obtained by synthesizing the green component light from the green phosphor and the red component light from the red phosphor, the LED 28 is composed of the blue component light and the yellow component from the LED chip. It can be said that it also has the light of. The chromaticity of the LED 28 changes depending on, for example, the absolute value or relative value of the content in the green phosphor and the red phosphor, and accordingly the content of the green phosphor and the red phosphor is adjusted as appropriate. Thus, the chromaticity of the LED 28 can be adjusted. In this embodiment, the green phosphor has a main emission peak in the green wavelength region of 500 nm to 570 nm, and the red phosphor has a main emission peak in the red wavelength region of 600 nm to 780 nm. It is said.

(LED board)
The LED substrate 30 has a base material that has a square shape in plan view, and in the chassis 22 in a state where the direction of one side coincides with the X-axis direction and the direction of the other side coincides with the Y-axis direction. It is accommodated while extending along the bottom plate 22a. The LED 28 is surface-mounted on the surface facing the front side (the surface facing the optical member 18 side) among the plate surfaces of the base material of the LED substrate 30. The LED 28 has a light emitting surface facing the optical member 18 (the liquid crystal panel 16) and an optical axis that coincides with the Z-axis direction, that is, the direction orthogonal to the display surface of the liquid crystal panel 16. A plurality of LEDs 28 are arranged in parallel along the direction of one side (X-axis direction) and the direction of the other side (Y-axis direction) of the LED substrate 30, and a wiring pattern formed on the LED substrate 30. (Not shown) are connected in series. The arrangement pitch of the LEDs 28 is substantially constant, that is, it can be said that the LEDs 28 are arranged at substantially equal intervals.

  The LEDs 28 mounted on the LED substrate 30 having the above-described configuration are both set in the chassis 22 with the X-axis direction (the long side direction of the chassis 22) as the row direction and the Y-axis direction (the short side direction of the chassis 22) as the column direction. Arranged in a matrix (arranged in a matrix, planar arrangement). The base material of the LED substrate 30 is made of the same metal as the chassis 22 such as an aluminum material, and the above-described wiring pattern (not shown) made of a metal film such as a copper foil is provided on the surface thereof with an insulating layer interposed therebetween. In addition, the outermost surface is formed with a reflection layer (not shown) exhibiting a white color having excellent light reflectivity. The LEDs 28 arranged in parallel on the LED substrate 30 are connected in series by this wiring pattern. In addition, as a material used for the base material of the LED substrate 30, an insulating material such as ceramic can be used.

(Diffusion lens)
The diffusing lens 27 is made of a synthetic resin material (for example, polycarbonate, acrylic, etc.) that is substantially transparent (having high translucency) and has a refractive index higher than that of air. As shown in FIG. 5, the diffusing lens 27 has a predetermined thickness and is formed in a substantially circular shape when viewed from above, and covers each LED 28 individually from the front side with respect to the LED substrate 30, that is, a flat surface. Are attached so as to overlap each LED 28 as viewed in FIG. Specifically, the diffusing lens 27 is disposed at a position that is substantially concentric with the LED 28 in a plan view. For this reason, the diffusion lens 27 is also arranged in a matrix in the chassis 22. The diffusing lens 27 includes a base portion 27a having a flat plate shape in a plan view and a hemispherical portion 32b having a flat hemispherical shape. In the vicinity of the peripheral edge of the diffusing lens 27, three shaft-shaped support legs 31 protrude from the back side of the base 27a. The three support legs 31 are arranged at a position equidistant from the central portion of the diffusion lens 27 (a portion overlapping with the LED 28) in plan view, and are attached to the surface of the LED substrate 30 by, for example, an adhesive or a thermosetting resin. It is glued. The diffusion lens 27 is supported on the surface of the LED substrate 30 by the support legs 31. The diffusion lens 27 can emit light having strong directivity emitted from the LED 28 while diffusing. That is, since the directivity of the light emitted from the LED 28 is reduced through the diffusion lens 27, the area between the adjacent LEDs 28 is difficult to be visually recognized as a dark part even if the interval between the adjacent LEDs 28 is wide. Thereby, it is possible to reduce the number of installed LEDs 28.

(Support member)
The support member 26 will be described. The support member 26 is made of a synthetic resin such as polycarbonate, and has a white surface with excellent light reflectivity. As shown in FIG. 4, the support member 26 includes a main body portion 26 a along the plate surface of the LED substrate 30, and a fixing portion 26 b that protrudes from the main body portion 26 a toward the back side, that is, the chassis 22 side and is fixed to the chassis 22. And a support pin 26c protruding from the main body 26a to the front side. The main body portion 26 a has a substantially circular plate shape when seen in a plan view, and at least the LED substrate 30 can be sandwiched between the main body portion 26 a and the bottom plate 22 a of the chassis 22. The fixing portion 26b can be locked to the bottom plate 22a while penetrating through the insertion hole and the mounting hole respectively formed corresponding to the mounting position of the support member 26 on the LED board 30 and the bottom plate 22a of the chassis 22. The support pin 26c can support the optical member 18 (directly the diffusion plate 18a) from the back side, thereby maintaining a constant positional relationship between the LED 28 and the optical member 18 in the Z-axis direction. In addition, inadvertent deformation of the optical member 18 can be restricted. The support member 26 sandwiches the bottom portion 20 a of the reflection sheet 20 together with the LED substrate 30 between the main body portion 26 a and the bottom plate 22 a of the chassis 22.

(Reflective sheet)
The reflection sheet 20 is made of a synthetic resin, and the surface thereof is a reflection surface exhibiting a white color with excellent light reflectivity. As shown in FIG. 3, the reflection sheet 20 has a size that is laid over almost the entire inner surface of the chassis 22, so that all the LED boards 30 arranged in parallel in the chassis 22 are collectively displayed from the front side. And can be covered. The reflection sheet 20 can efficiently raise the light in the chassis 22 toward the optical member 18 side. The reflection sheet 20 extends along the bottom plate 22a of the chassis 22 and covers a large portion of the bottom plate 22a, an outer end on the short side of the bottom portion 20a, and an outer end on the long side of the bottom portion 20a. From the outer side of the rising part 29b and the rising part 29b, and is mounted on the receiving plate 22c of the chassis 22 while being inclined to the bottom part 20a. It is comprised from the extension part 20c. The bottom portion 20a of the reflection sheet 20 is arranged so as to be on the front side with respect to the front side surface of each LED substrate 30, that is, the LED 28 mounting surface. In addition, a light source insertion hole 20d having a circular shape in plan view through which each diffusion lens 27 (each LED 28) is inserted at a position overlapping with each diffusion lens 27 (each LED 28) on the bottom portion 20a of the reflection sheet 20 in plan view. Is provided.

(Description of the configuration according to the main part of the present embodiment)
Next, the configuration of the rising portion 20b of the reflection sheet 20 that is a main part of the present embodiment will be described in detail. As shown in FIGS. 2 to 4, three protruding pieces 34 that protrude on the light emitting side (front side) of the LED 28 are arranged on the rising portion 20 b. Each protruding piece 34 extends along the long side direction (X-axis direction) and the short side direction (Y-axis direction) of the chassis 22 in the same manner as the rising portion 20b. Each projection piece 34 has a triangular shape in a sectional view (see FIG. 5), and has a contact surface 34a that contacts the rising portion 20b and an inclined surface 34b. Of the surfaces provided on each projection piece 34, the inclined surface 34b is exposed to both the diffusion lens 27 (LED 24) side and the light emission side (front side) of the diffusion lens 27 (LED 24), as shown in FIG. It is an exposed surface and can reflect the light from the LED 24. In addition, the inclined surface 34b has an angle θ2 formed with respect to the bottom plate 22a of the chassis 22 (or the plate surface of the LED substrate 30 parallel to the bottom plate 22a), and the inclined surface of the rising portion 20b is the bottom plate of the chassis 22. The inclination angle is larger than the angle θ1 formed with respect to 22a (or the plate surface of the LED substrate 30 parallel to the bottom plate 22a). Each protruding piece 34 is made of plastic like the rising portion 20b, and is attached to the rising portion 20b by bonding or the like.

  Now, as described above, the protruding piece 34 having an exposed surface (inclined surface 34b) having a larger inclination angle than the inclined surface of the rising portion 20 is disposed on the rising portion 20b of the reflection sheet 20. For example, the light emitted from the base portion 27a of the diffusing lens 27 disposed in the vicinity of the outer peripheral portion of the bottom plate 22a of the chassis 22 and directed toward each projection piece 34 is caused by each projection piece 34 as shown by a one-dot chain line in FIG. The light is reflected from the reflection portion almost directly above. For this reason, since the light reflected by each projection piece 34 and directed toward the liquid crystal panel 16 is less reflected by the surface of the rising portion 20 and directed toward the liquid crystal panel 16, the amount of light accompanying the reflection is less. The brightness on the display surface of the panel 16 is improved. That is, the light emitted from the diffusion lens 27 (LED 28) disposed in the vicinity of the outer peripheral portion of the bottom plate 22a of the chassis 22 is reflected by each projection piece 34, whereby the luminance at the outer peripheral portion of the display surface of the liquid crystal panel 16 is increased. It has an improved configuration.

  As described above, in the backlight device 24 according to the present embodiment, since the protruding piece 34 is arranged to protrude from the rising portion 20b, the protruding piece 34 is emitted from the LED 28 arranged in the vicinity of the rising portion 20b. The light reflected by the exposed surface is directed more directly from the reflecting portion than when reflected by the surface of the rising portion 20b. For this reason, the luminance of the display surface of the liquid crystal panel 16 immediately above the rising portion 20b can be improved, and the luminance of the outer peripheral portion of the display surface of the liquid crystal panel 16 can be improved.

  Further, in the backlight device 24 according to the present embodiment, the brightness at the outer peripheral portion of the display surface of the liquid crystal panel 16 can be improved without separately providing the LED 28 at the end of the bottom plate 22a of the chassis 22. Costs and manufacturing costs do not increase.

  In the backlight device 24 according to the present embodiment, the protruding piece 34 corresponds to the contact surface 34a that contacts the rising portion 20b and the exposed surface, and the inclined surface 34b having an inclination angle larger than the inclination angle of the rising portion 20b. And has a triangular shape in cross-sectional view. Thus, the specific shape of the protrusion piece 34 is realized according to the characteristics of the light emitted from the LED 28.

  In the backlight device 24 according to the present embodiment, a plurality of protruding pieces 34 are arranged from the rising base end of the rising portion 20b to the rising tip. For this reason, the light emitted from the LED 28 arranged in the vicinity of the rising portion 20b by each exposed surface of the plurality of protruding pieces 34 can be effectively reflected directly above the rising portion 20b. Thereby, the brightness | luminance in the outer peripheral part of the display surface of the liquid crystal panel 16 can be improved further.

  Further, in the backlight device 24 according to the present embodiment, the rising portion 20b and the protruding piece 34 may be made of plastic. For this reason, the rising portion 20b and the protruding piece 34 can be easily formed, and the rigidity of both can be increased.

  Further, in the backlight device 24 according to the present embodiment, the rising portion 20b and the protruding piece 34 are integrally formed. For this reason, while being able to make the reflective sheet 20 and the protrusion piece 34 easy to shape | mold, the manufacturing process of the backlight apparatus 24 can be simplified.

<Embodiment 2>
A second embodiment will be described with reference to the drawings. In the second embodiment, the size of the plurality of protruding pieces 134 arranged on the rising portion 120b is different from that of the first embodiment. Since the other configuration is the same as that of the first embodiment, the description of the structure, operation, and effect is omitted. In FIG. 6, the portions obtained by adding the numeral 100 to the reference numerals in FIG. 5 are the same as the portions described in the first embodiment.

  In the backlight device 124 according to the second embodiment, as shown in FIG. 6, the sizes of the three protruding pieces 134 are different. Specifically, each protruding piece 134 becomes larger from the rising base end 120f1 side of the rising portion 120b toward the rising tip 120f2 side. Here, the LED 128 is a light source having directivity, and in this embodiment, the sizes of the three protruding pieces 134 are adjusted according to the directivity characteristics of the LED 128. That is, in this embodiment, the directivity characteristic of the LED 128 is such that the amount of light traveling toward the rising tip 120f2 is larger than the amount of light traveling toward the rising proximal end 120f1, and accordingly, the rising tip 120f2 On the side, a larger protruding piece 134 is arranged. Thus, by adjusting the size of each projection piece 134 according to the directivity characteristics of the LED 128, the light emitted from the LED 128 arranged in the vicinity of the rising portion 120b is effectively directly above the rising portion 120b. Can be reflected.

  Further, in the present embodiment, the rising portions 120b made of plastic and the protruding pieces 134 are integrally formed. For this reason, while being able to make the reflection sheet 120 and the protrusion piece 134 easy to shape | mold, the manufacturing process of the backlight apparatus 124 can be simplified.

<Embodiment 3>
Embodiment 3 will be described with reference to the drawings. The third embodiment is different from the first embodiment in the interval between the plurality of protruding pieces 234 arranged on the rising portion 220b. Since the other configuration is the same as that of the first embodiment, the description of the structure, operation, and effect is omitted. In FIG. 7, the portions obtained by adding the numeral 200 to the reference numerals in FIG. 5 are the same as the portions described in the first embodiment.

  In the backlight device 224 according to the third embodiment, as shown in FIG. 7, the intervals between the three protruding pieces 234 are different. Specifically, the intervals W1 and W2 between the protruding pieces 234 increase from the rising base end 220f1 side of the rising portion 220b toward the rising tip 220f2 side. Therefore, the relationship of W2> W1 is established. Here, the LED 228 is a light source having directivity, and in this embodiment, the interval between the three protruding pieces 234 is adjusted according to the directivity characteristics of the LED 228. That is, in this embodiment, the directivity characteristic of the LED 228 is such that the light amount toward the rising base end 220f1 is larger than the light amount toward the rising leading end 220f2, and accordingly, the rising base end On the 220f1 side, the interval between the protruding pieces 234 is small. As described above, the distance between the protrusions 234 is adjusted according to the directivity characteristics of the LED 228, so that the light emitted from the LED 228 disposed in the vicinity of the rising portion 220b is effectively directly above the rising portion 220b. And can be reflected.

<Embodiment 4>
Embodiment 4 will be described with reference to the drawings. In the third embodiment, the shape of the plurality of protruding pieces 334 arranged on the rising portion 320b is different from that of the first embodiment. Since the other configuration is the same as that of the first embodiment, the description of the structure, operation, and effect is omitted. In FIG. 8, the portions obtained by adding the numeral 300 to the reference numerals in FIG. 5 are the same as the portions described in the first embodiment.

  In the backlight device 324 according to the fourth embodiment, as illustrated in FIG. 8, the three protruding pieces 334 arranged on the rising portion 320 b each form an arch shape in a cross-sectional view and come into contact with the rising portion 320 b. It has a surface 334a and a curved surface 334b corresponding to the exposed surface. Even when the protruding piece 334 has such a shape, a part of the curved surface 334b corresponding to the exposed surface is formed between the diffusion lens 327 (LED 324) side and the light emission side (front side) of the diffusion lens 327 (LED 334). Since the light is exposed to both, the light reflected by the curved surface 334b is directed almost directly above the reflection portion, and the luminance of the display surface of the liquid crystal panel 316 immediately above the rising portion 320b can be improved. In particular, it is suitable when the directivity characteristics of the LED 328 are such that it is more effective to reflect light by a curved surface than to reflect light by an inclined surface.

The modifications of the above embodiments are listed below.
(1) In each of the above-described embodiments, the configuration in which the shape of the protruding piece arranged on the rising portion is a triangular shape in cross section or an arch shape in cross section is exemplified, but the shape of the protruding piece is not limited.

(2) In each of the above embodiments, the configuration in which the rising portion of the reflection sheet is made of plastic is exemplified, but the material constituting the rising portion is not limited.

(3) In each of the above-described embodiments, the configuration in which each of the light emission sides of the LEDs is covered with the diffusing lens is illustrated, but a configuration in which the diffusing lens is not disposed may be used. In such a case, the diffusion effect of light from the LED is lower than when a diffusing lens is provided, and the outer peripheral portion of the display surface of the liquid crystal panel can be displayed particularly darkly. Is suitable.

(4) In addition to the above-described embodiments, the shape, material, and the like of the protruding pieces arranged on the rising portion can be appropriately changed.

(5) In addition to the above-described embodiments, the size, interval, and the like of the plurality of protruding pieces arranged on the rising portion can be appropriately changed.

(6) In each of the above embodiments, a liquid crystal display device using a liquid crystal panel as the display panel has been illustrated, but the present invention can also be applied to display devices using other types of display panels.

(7) In each of the above embodiments, a television receiver provided with a tuner has been exemplified. However, the present invention can also be applied to a display device that does not include a tuner.

  As mentioned above, although each embodiment of this invention was described in detail, these are only illustrations and do not limit a claim. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.

  In addition, the technical elements described in the present specification or drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in this specification or the drawings can achieve a plurality of objects at the same time, and has technical usefulness by achieving one of the objects.

  TV ... TV receiver, Ca, Cb ... cabinet, T ... tuner, VC ... image conversion circuit board, S ... stand, 10 ... liquid crystal display, 12, 112, 212 ... bezel, 14, 114, 214 ... frame, 16 116, 216 ... Liquid crystal panel, 18, 118, 218 ... Optical member, 20, 120, 220 ... Reflective sheet, 20a, 120a, 220a ... Bottom, 20b, 120b, 220b ... Rising part, 22, 122, 222 ... Chassis , 22a, 122a, 222a ... bottom plate, 24, 124, 224 ... backlight device, 26, 126, 226: support member, 27, 127, 227 ... diffusion lens, 28, 128, 228 ... LED, 30, 130, 230 ... LED substrate, 31, 131, 231 ... support legs, 34, 134, 234 ... projection pieces

Claims (11)

Multiple light sources;
A light source substrate in which a plurality of the light sources are attached on a plate surface;
A chassis having at least a plate-like portion that has a rectangular shape in plan view, and the light source substrate mounted on the plate-like portion so as to expose the light source;
A light source insertion hole is provided over the light source substrate and the plate-like portion, and the light source insertion hole is provided in a portion overlapping the light source, and extends along the plate surface of the plate-like portion. A reflective sheet having a bottom portion sized to cover most of the plate-like portion, and a rising portion that rises from the outer end of the bottom portion to the light emission side of the light source and is inclined with respect to the bottom portion;
A protruding piece that is disposed on the rising portion and protrudes on the light emitting side of the light source, and has an exposed surface that is exposed at least on both the light source side and the light emitting side of the light source and reflects light;
A lighting device comprising:   The protruding piece has a contact surface that contacts the rising portion and an inclined surface that corresponds to the exposed surface and has an inclination angle larger than the inclination angle of the rising portion, and has a triangular shape in a cross-sectional view. The lighting device according to claim 1.   The lighting device according to claim 1, wherein the protruding piece has a contact surface that contacts the rising portion and a curved surface corresponding to the exposed surface, and has an arch shape in a cross-sectional view.   The lighting device according to any one of claims 1 to 3, wherein a plurality of the protruding pieces are arranged from a rising base end to a rising tip of the rising portion. The light source is a light source having directional characteristics;
The lighting device according to claim 4, wherein intervals between the plurality of projection pieces are adjusted according to directivity characteristics of the light source. The light source is a light source having directional characteristics;
The lighting device according to claim 4, wherein the size of the plurality of projection pieces is adjusted according to the directivity characteristics of the light source.   The lighting device according to any one of claims 1 to 6, wherein the rising portion and the protruding piece are made of plastic.   The lighting device according to any one of claims 1 to 7, wherein the rising portion and the protruding piece are integrally formed.   A display apparatus provided with the display panel which performs a display using the light from the illuminating device of any one of Claims 1-8.   The display device according to claim 9, wherein the display panel is a liquid crystal panel using liquid crystal.   A television receiver comprising the display device according to claim 9.

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