JP5662952B2 - Lighting device, display device, and television receiver - Google Patents

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, in the direct type backlight device including the reflection sheet as described above, light sources such as LEDs are usually arranged in a matrix on the bottom plate of the chassis. With such a configuration, the portion overlapping the oblique direction side of the light source disposed on the outermost periphery on the display surface of the liquid crystal panel of the backlight device is the row direction side and the column direction of the light source disposed on the outermost periphery. Since the light source is farther from the light source than the part that overlaps the side, the former is displayed as a dark part, the latter as a bright part, and is displayed on the outer peripheral part of the display surface of the liquid crystal panel. May occur.

  For example, Patent Document 1 discloses a backlight device that can reduce such luminance unevenness generated on the outer peripheral portion of the display surface of a liquid crystal panel. 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. The difference in luminance from the other bright portions on the outer peripheral portion of the display surface is reduced. Thereby, luminance unevenness in the outer peripheral portion of the display surface of the liquid crystal panel is reduced.

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 difference between the bright part and the dark part cannot be reduced over the entire outer peripheral part of the display surface of the liquid crystal panel. For this reason, luminance unevenness in the outer peripheral portion of the display surface of the liquid crystal panel cannot be sufficiently prevented or suppressed. 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 that can prevent or suppress luminance unevenness in an outer peripheral portion of a display surface without separately providing a light source.

  The technology disclosed in this specification includes a plurality of light sources arranged in a matrix in a plan view, a light source substrate on which a plurality of the light sources are attached on a plate surface, and a plate shape having at least a rectangular shape in plan view A chassis in which the light source substrate is mounted on the plate-like portion so as to expose the light source, and a portion that is laid across the light source substrate and the plate-like portion and overlaps the light source A reflection sheet provided with a light source insertion hole through which the light source is inserted, and extending along the plate-like portion and covering a large part of the plate-like portion, and an outer portion of the bottom portion A rising portion that rises from the end to the light emission side of the light source and is inclined with respect to the bottom portion, and the inclination angle of the rising portion on the oblique direction side of the light source disposed on the outermost periphery is the maximum. The row direction side of the light source arranged on the outer periphery or A reflection sheet that is the larger than the inclination angle of the rising portion in the direction, a lighting device comprising a.

  According to such an illuminating device, on the oblique direction side of the light source arranged on the outermost periphery, the rising portion has a large inclination angle, and thus the light reflected by the rising portion is directed directly above. Thereby, the brightness | luminance of the site | part which overlaps with the diagonal direction side of the light source distribute | arranged to the outermost periphery in a display surface can be improved, As a result, the diagonal direction of the light source distribute | arranged to the outermost periphery in the edge part of a display surface Since the difference in luminance between the portion overlapping with the side and the portion overlapping with the row direction side and the column direction side of the light source arranged on the outermost periphery is reduced, the outer periphery of the display surface can be obtained without separately arranging the light source. Brightness unevenness in the portion can be prevented or suppressed.

In the planar view, the boundary line between the bottom portion and the rising portion located on the row direction side or the column direction side of the light source disposed on the outermost periphery in the plan view is disposed on the outermost periphery. The distance between the boundary line and the edge of the plate-like part may be larger than the boundary line between the bottom part and the rising part located on the oblique direction side of the light source.
According to this configuration, the rising tip can be matched between the rising portion having a large inclination angle and the rising portion having a small inclination angle, and thus a specific configuration of the reflection sheet can be realized.

A boundary line between the bottom portion and the rising portion may be uneven in plan view.
According to this configuration, it is possible to make the reflection sheet easier to design and easier to form than when the boundary line is wavy in a plan view.

At the four corners of the plate-like part, the distance between the boundary line between the bottom part and the rising part and the edge of the plate-like part may be the smallest.
According to this structure, the specific shape of the reflective sheet in the four corners of the plate-like portion can be realized.

The rising portion of the reflective sheet may be made of plastic.
According to this configuration, it is possible to easily form the rising portions having different inclination angles, and it is possible to increase the rigidity of the rising portions.

A side plate that rises from an edge of the plate-like portion toward the light emission side of the light source, a diffusion plate that is arranged on the rising tip side of the side plate, and a plate disposed on the light source substrate, the plate-like portion and the light source substrate, A support pin that penetrates through the reflection sheet and has a tip abutting against the diffusion plate to support the diffusion plate may be further provided.
According to this configuration, light from the light source can be effectively diffused to the light emitting side by the diffusion plate, and a configuration in which the diffusion plate is effectively supported by the support pins can be realized.

A diffusion lens that is provided in each of the light sources, covers a light emission side of the light source, and diffuses light from the light source may be further provided.
According to this configuration, the light from the light source passes through the diffusing lens, so that the light from the light source is diffused and the directivity is relaxed. Brightness can be maintained.

  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 the present specification, it is possible to provide a direct illumination device that can prevent or suppress luminance unevenness in 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 taken along the long side direction of the backlight device 24. FIG. 4 is a cross-sectional view taken along the vv cross section in FIG. 3, and is a cross-sectional view taken 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. 5 is an enlarged plan view in which the vicinity of the rising portion 20b is enlarged. FIG. 6 is an exploded perspective view of a liquid crystal display device 110 according to the second embodiment. Plan view of the backlight device 244 4 is an exploded perspective view of a liquid crystal display device 210 according to Embodiment 3. FIG. Plan view of the backlight device 224

<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 to 5, 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 FIGS. 4 and 5, the optical member 18 has its outer edge portion placed on the receiving plate 22 c so as to cover the light emission side of the LED 28, and the liquid crystal panel 16 and the diffusion lens 27 (LED substrate 30). Between them. 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 FIGS. 4 and 5). 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 (FIGS. 4 and 5). reference).

(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 FIGS. 6 and 7, the diffusing lens 27 has a predetermined thickness and is formed in a substantially circular shape when seen in a plan view, and covers each LED 28 individually from the front side with respect to the LED substrate 30. That is, each LED 28 is attached so as to overlap with each other when viewed in a plane. 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 27b 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 20 a 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 mounting surface of the LED 28. 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 described above, since each diffusing lens 27 (each LED 28) is arranged in a matrix on the bottom portion 20a in plan view, among the diffusing lenses 27 (each LED 28), the diffusing lenses 27 (disposed on the outermost periphery). Each LED 28) is adjacent to the rising portion 20b (see FIG. 3). In the present embodiment, the rising portion 20b (hereinafter, the second rising portion 20b2) located on the oblique direction side of the diffusing lens 27 (LED 28) disposed on the outermost periphery (intersecting with the alternate long and short dash line B in FIG. 3). Of the diffuser lens 27 (LED 28) disposed on the outermost periphery (which intersects with the alternate long and short dash line A in FIG. 3) and rises 20b (hereinafter referred to as the first). It is assumed that it is larger than the inclination angle of the rising portion 20b1). The inclination angle here refers to an acute angle formed by the inclined surfaces of the rising portions 20b1 and 20b2 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). The first rising portion 20b1 indicates the angle θ1 shown in FIG. 6, and the second rising portion 20b2 indicates the angle θ2 shown in FIG. 7, and in this embodiment, the relationship θ1 <θ2 is established.

  Further, the boundary line 20e between the bottom 20a and the rising part 20b is wavy in a plan view as shown in FIG. Then, as shown in FIG. 6, the distance between the boundary 20e between the bottom 20a and the first rising part 20b1 and the edge of the bottom plate 22a of the chassis 22 is W3, and the bottom 20a and the second rising part In this embodiment, the relationship of W3> W2 is established when the distance between the boundary line 20e between the portion 20b2 and the edge of the bottom plate 22a of the chassis 22 is W2. For this reason, even if the inclination angle is different between the first rising portion 20b1 and the second rising portion 20b2, the tip 20f1 of the first rising portion 20b1 (the boundary line with the extending portion 20c) and the second The leading end 20f2 of the rising portion 20b2 (boundary line with the extending portion 20c) coincides (see FIG. 6). As shown in FIG. 3, the distance between the boundary line 20e and the edge of the bottom plate 22a is such that the distance W1 between the boundary line 20e and the edge of the bottom plate 22a at the four corners of the bottom plate 22a is the smallest. Has been.

  Now, as described above, the rising portion 20b of the reflection sheet 20 is configured by the first rising portion 20b1 and the second rising portion 20b2 having different inclination angles, for example, the diffusion lens 27 disposed on the outermost periphery. Among the light emitted from the base portion 27a, the light directed toward the first rising portion 20b1 located on the row direction side or the column direction side of the diffusion lens 27 (LED 28) has a locus as indicated by a one-dot chain line in FIG. The light is reflected by the first rising portion 20b1 and travels toward the liquid crystal panel 16 via the optical member 18. On the other hand, of the light emitted from the base 27a of the diffusing lens 27 arranged on the outermost periphery, the light directed to the second rising portion 20b2 located on the oblique side of the diffusing lens 27 (LED 28) is the second rising portion. Since the inclination angle of 20b2 is larger than that of the first rising portion 20b1, the second rising portion 20b2 reflects the light from the reflection portion to just above it, as shown by the one-dot chain line in FIG. For this reason, the light reflected by the second rising portion 20b2 and traveling toward the liquid crystal panel 16 is less reduced in light amount due to reflection than the light reflected by the first rising portion 20b1 and traveling toward the liquid crystal panel 16. The decrease in luminance on the display surface of the liquid crystal panel 16 is small. Accordingly, at the end of the display surface of the liquid crystal panel 16, a portion overlapping the diagonal direction side of the LED 28 (diffuse lens 27) disposed on the outermost periphery and the row direction side of the LED 28 (diffuse lens 27) disposed on the outermost periphery. In addition, a difference in luminance hardly occurs between the column direction side and the overlapping portion.

  As described above, in the backlight device 24 according to the present embodiment, on the diagonal direction side of the LED 28 (diffuse lens 27) disposed on the outermost periphery, the rising portion 20b2 has a large inclination angle, and thus is reflected by the rising portion 20b2. The light that goes through is going directly above. Thereby, the brightness | luminance of the site | part which overlaps with the diagonal direction side of LED28 (diffuse lens 27) distribute | arranged to the outermost periphery in the display surface of the liquid crystal panel 16 can be improved. As a result, at the end of the display surface of the liquid crystal panel 16, a portion overlapping the oblique direction side of the LED 28 (diffuse lens 27) disposed on the outermost periphery and the row direction of the LED 28 (diffuse lens 27) disposed on the outermost periphery. Since the difference in luminance between the side and the column direction side is reduced, luminance unevenness in the outer peripheral portion of the display surface of the liquid crystal panel 16 can be prevented or suppressed without separately providing the LED 28. .

  Further, in the backlight device 24 according to the present embodiment, since the difference in luminance at the outer peripheral portion of the display surface of the liquid crystal panel 16 is reduced without separately providing the LED 28 at the end of the bottom plate 22a of the chassis 22, the member Luminance unevenness at the edge of the display surface of the liquid crystal panel 16 can be prevented or suppressed without increasing costs and manufacturing costs.

  Further, in the backlight device 24 according to the present embodiment, the reflection sheet 20 has a bottom portion 20a and a rising portion located on the row direction side or the column direction side of the LED 28 (diffuse lens 27) disposed on the outermost periphery in plan view. The boundary line 20d and the bottom plate are more than the boundary line 20d between the bottom portion 20a and the rising portion 20b located on the diagonal direction side of the LED 28 (diffuse lens 27) disposed on the outermost periphery. The distance between the edge 22a is large. For this reason, the rising tips 20f1 and 20f2 can be matched between the rising portion 20b1 having a large inclination angle and the rising portion 20b2 having a small inclination angle, and the backlight device 24 can be easily designed.

  In the backlight device 24 according to the present embodiment, the distance W1 between the boundary line 20d between the bottom 20a and the rising portion 20b and the edge of the bottom plate 22a is the smallest at the four corners of the bottom plate 22a. ing. For this reason, specific shapes of the reflection sheet 20 at the four corners of the bottom plate 22a are realized.

  Moreover, in the backlight device 24 according to the present embodiment, the rising portion 20b of the reflection sheet 20 is made of plastic. For this reason, the rising portions 20b1 and 20b2 having different inclination angles can be easily formed, and the rigidity of the rising portion 20b can be increased.

  Further, the backlight device 24 according to the present embodiment includes a side plate 22b that rises from the edge of the bottom plate 22a to the light emission side (front side) of the LED 28 (diffuse lens 27), and a diffusion plate that is disposed on the leading end side of the side plate 22b. 18a and a support pin 26 that is disposed on the LED substrate 30 and penetrates the bottom plate 22a, the LED substrate 30, and the reflection sheet 20, and has a tip abutting against the diffusion plate 18a to support the diffusion plate 18a. I have. Thereby, the light from the LED 28 (the diffusion lens 27) can be effectively diffused to the light emitting side by the diffusion plate 18a, and the configuration in which the diffusion plate 18a is effectively supported by the support pins 26 is realized. Can do.

  The backlight device 24 according to the present embodiment further includes a diffusing lens 27 that is provided in each of the LEDs 28, covers the light emission side of the LEDs 28, and diffuses the light from the LEDs 28. For this reason, since the light from the LED 28 passes through the diffusion lens 27, the light from the LED 28 is diffused and the directivity is relaxed. Therefore, even in the case where the number of the LEDs 28 is reduced, the backlight device 24 A predetermined brightness can be maintained.

<Embodiment 2>
A second embodiment will be described with reference to the drawings. In the second embodiment, the shape of the rising portion 120b of the reflection sheet 120 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 FIGS. 8 and 9, the parts obtained by adding the numeral 100 to the reference numerals in FIGS. 2 and 3 are the same as the parts described in the first embodiment.

  In the backlight device 124 according to the second embodiment, as illustrated in FIGS. 8 and 9, the boundary line 120 e between the bottom 120 a and the rising portion 120 b in the reflection sheet 120 has a shape that is uneven in plan view. ing. The rising portion 120b is constituted by a first rising portion 120b1 and a second rising portion 120b2 having different inclination angles. Since the rising portion 120b has such a shape, the boundary line 120e is linear as compared with the case where the boundary line 120e is wavy in a plan view. Therefore, it is easy to design the reflection sheet 120. In addition, the reflective sheet 120 can be easily formed.

<Embodiment 3>
Embodiment 3 will be described with reference to the drawings. In the third embodiment, the shape of the rising portion 220b of the reflection sheet 220 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. 10 and 11, the parts obtained by adding the numeral 200 to the reference numerals in FIGS. 2 and 3 are the same as the parts described in the first embodiment.

  In the backlight device 224 according to the third embodiment, as illustrated in FIGS. 10 and 11, the boundary line 220 e between the bottom 220 a and the rising portion 220 b in the reflection sheet 220 is a trapezoidal unevenness in plan view. It has become. Even when the rising portion 220b has such a shape, the boundary line 220e is linear as compared with the case where the boundary line 220e is wavy in a plan view. It can be easy to design, and the reflective sheet 220 can be easily molded.

The modifications of the above embodiments are listed below.
(1) In each of the above embodiments, reference is not made to the inclination angles of the first rising part and the second rising part of the rising part of the reflection sheet, but the inclination angles of both are not limited. The inclination angle is preferably adjusted according to the directivity characteristics of the LED.

(2) In each of the above embodiments, the boundary line between the bottom portion and the rising portion in the reflection sheet has been illustrated as an uneven shape and a trapezoidal shape in plan view, but the shape of the boundary line is not limited.

(3) 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.

(4) 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, there is a large difference in luminance between the portion overlapping the oblique direction side of the light source disposed on the outermost periphery and the portion overlapping the row direction side and column direction side of the light source disposed on the outermost periphery. Therefore, the effect of preventing or suppressing unevenness in luminance in this embodiment is suitable.

(5) In addition to the above embodiments, the shape, material, and the like of the rising portion of the reflection sheet can be changed as appropriate.

(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, 20b1, 120b1, 220b1 ... No. 1 rising portion, 20b2, 120b2, 2202b ... second rising portion, 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, 0,130,230 ... LED board, 31 ... support leg

Claims (10)

A plurality of light sources arranged in a matrix in plan view;
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 reflection sheet that is laid across the light source substrate and the plate-like portion, and is provided with a light source insertion hole through which the light source is inserted in a portion that overlaps the light source, and extends along the plate-like portion And a rising part that rises from the outer end of the bottom part toward the light emitting side of the light source and is inclined with respect to the bottom part. The inclination angle of the rising portion on the oblique direction side of the light source arranged on the outer periphery is larger than the inclination angle of the rising portion on the row direction side or the column direction side of the light source arranged on the outermost periphery. A reflective sheet;
A lighting device comprising:   In the planar view, the boundary line between the bottom portion and the rising portion located on the row direction side or the column direction side of the light source disposed on the outermost periphery in the plan view is disposed on the outermost periphery. The distance between the boundary line and the edge of the plate-like part is larger than the boundary line between the bottom part and the rising part located on the oblique direction side of the light source. The lighting device according to 1.   The lighting device according to claim 1 or 2, wherein a boundary line between the bottom portion and the rising portion is uneven in a plan view.   The distance between the boundary line between the bottom portion and the rising portion and the edge of the plate-like portion is the smallest at the four corners of the plate-like portion. The lighting device according to any one of the above.   The lighting device according to claim 1, wherein the rising portion of the reflection sheet is made of plastic. A side plate that rises from the edge of the plate-like portion to the light emission side of the light source;
A diffusion plate disposed on the leading end side of the side plate;
And a support pin that is disposed on the light source substrate and penetrates the plate-like portion, the light source substrate, and the reflection sheet, and supports the diffusion plate with its tip contacting the diffusion plate. The lighting device according to any one of claims 1 to 5.   The illuminating device according to claim 1, further comprising a diffusing lens that is provided in each of the light sources, covers a light emission side of the light source, and diffuses light from the light source.   A display apparatus provided with the display panel which displays using the light from the illuminating device of any one of Claims 1-7.   The display device according to claim 8, wherein the display panel is a liquid crystal panel using liquid crystal.   A television receiver comprising the display device according to claim 8.

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