JP2019139906A - Illumination device, display device, and television receiver - Google Patents

Abstract

To inhibit color unevenness from occurring.SOLUTION: A backlight device 12 includes: an LED 17; a reflection plate 19 that transmits at least a part of light emitted from the LED 17; a wavelength conversion sheet 21 including a fluorescent body for executing wavelength conversion for at least a part of the light from the LED 17; an LED arrangement region LA located at a central side in the wavelength conversion sheet 21 and the reflection plate 19, where the LED 17 is arranged; an LED non-arrangement region LNA located at an outer end side in the wavelength conversion sheet 21 and the reflection plate 19, where the LED 17 is not arranged; and a light exhibition part 27 arranged so as to overlap with a part of the LED non-arrangement region LNA in a light-outgoing route until the light from the LED 17 is emitted to the outside, which exhibits the same color as the light from the LED 17, or exhibits the same color as each primary color light constituting the light.SELECTED DRAWING: Figure 5

Description

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

As an example of a surface illumination light source device provided in a conventional liquid crystal display device, one described in Patent Document 1 can be cited. The surface illumination light source device described in Patent Document 1 has a bottom surface, a side surface, and an opening having a predetermined area, a reflector provided therein, and a point light source disposed on the bottom surface, and a predetermined distance from the point light source. And a radiation-side reflecting means that transmits and reflects light, and has a central reflecting portion within a predetermined range directly above the point light source and an outer reflecting portion around the central reflecting portion. The side reflection part is made of a reflecting member that transmits, reflects, and irregularly reflects a part of light and has a predetermined reflectance, and the central reflection part is a light-transmissive reflection part having a reflectance higher than that of the outer reflection part. Is formed.
On the other hand, as an example of an illumination device that obtains desired white light by combining an LED light source and a phosphor, one described in Patent Document 2 can be cited. The illumination device described in Patent Document 2 is arranged to be spaced from the light source between the radiation surface, at least one light source disposed opposite to the radiation surface, and between the radiation surface and the light source. And a phosphor layer obtained by patterning a phosphor excited by.

Japanese Patent No. 5678243

Japanese Patent No. 5532329

  In the surface illumination light source device described in Patent Document 1 described above, uniform illumination light is obtained by reflecting / transmitting light from a point light source by a reflecting member. However, as the size increases, a difference in the amount of light tends to occur between the area where the light source is arranged and the area where the light source is not arranged, which may make it difficult to obtain uniform illumination light. On the other hand, in the illumination device described in Patent Document 2, the phosphor layer has a pattern in which the area occupied by the phosphor layer increases as the distance from the light source increases. However, since a large illuminating device is provided with a plurality of light sources, there are problems that the pattern of the phosphor layer becomes complicated and that the phosphor layer needs to be aligned with high accuracy with respect to the plurality of light sources. End up. In order to avoid this, it is conceivable to form the phosphor layer with a uniform distribution. However, in this case, the amount of light irradiated to the phosphor layer is set so that the region where the light source is disposed and the light source are not disposed. There is a possibility that color unevenness may occur due to the difference between the regions.

  The present invention has been completed based on the above circumstances, and an object thereof is to make it difficult for color unevenness to occur.

  The illuminating device of the present invention includes a light source, a reflector that is arranged at an interval on the light output side with respect to the light source and transmits at least part of light emitted from the light source, and the reflector with respect to the reflector A wavelength conversion sheet including a phosphor that is disposed on the opposite side of the light source side and that converts the wavelength of at least part of the light from the light source; and is positioned on the center side of the wavelength conversion sheet and the reflector. A light source arrangement area where the light source is arranged, a light source non-arrangement area where the light source is not arranged and located on the outer end side of the wavelength conversion sheet and the reflection plate, and light from the light source Coloring unit arranged to overlap with a part of the light source non-arrangement region in the light emission path until it is emitted to the outside, and presents the same color as the light from the light source, or the same color as each primary color light constituting the light And comprising.

  In this way, the light emitted from the light source is transmitted directly through the reflecting plate or after being reflected by the reflecting plate. The light transmitted through the reflecting plate is irradiated onto the wavelength conversion sheet, and at the time of passing through the wavelength conversion sheet, at least a part of the light is converted by the phosphor and emitted to the outside. Here, the light of the light source irradiated to the wavelength conversion sheet is sufficiently secured in the light source arrangement region in which the light source is arranged on the wavelength conversion sheet and the reflection plate at the center side. Therefore, in the light source arrangement region, the light quantity ratio between the light emitted after being wavelength-converted by the wavelength conversion sheet and the light emitted without being wavelength-converted by the wavelength conversion sheet becomes appropriate, and color unevenness is caused. It is hard to occur. On the other hand, in the light source non-arrangement region that is located on the outer end side of the wavelength conversion sheet and the reflection plate and the light source is not arranged, the light of the light source irradiated on the wavelength conversion sheet tends to be insufficient. For this reason, in the light source non-arrangement region, the light quantity ratio of light emitted after wavelength conversion by the wavelength conversion sheet tends to be larger than the light quantity ratio of light emitted without being wavelength converted by the wavelength conversion sheet. As a result, color unevenness is likely to occur.

  On the other hand, in the light emission path until the light from the light source is emitted to the outside, a color display portion that has the same color as the light from the light source or the same color as each primary color light constituting the light has a light source non-arrangement region. Since it is arranged so as to overlap with a part of the light source, it is possible to compensate for the light having the same color as the light of the light source that tends to be insufficient in the light source non-arrangement region, or the light having the same color as each primary color light constituting the light, by the coloring unit. . As a result, it becomes difficult for the light of the light source irradiated to the wavelength conversion sheet to be short in the light source non-arrangement region, so that the wavelength converted by the wavelength conversion sheet and the light emitted after wavelength conversion by the wavelength conversion sheet is wavelength-converted. The ratio of the quantity of light emitted without any change is made appropriate, thereby suppressing the occurrence of color unevenness.

  According to the present invention, color unevenness can be made difficult to occur.

1 is an exploded perspective view showing a schematic configuration of a television receiver according to Embodiment 1 of the present invention. AA line sectional view of FIG. 1 in the liquid crystal display device Plan view of a backlight device provided in a liquid crystal display device An enlarged plan view near the corner of the backlight device BB sectional view of FIG. 4 in the liquid crystal display device CC sectional view of FIG. 4 in the liquid crystal display device The top view of the backlight apparatus with which the liquid crystal display device which concerns on Embodiment 2 of this invention is equipped. An enlarged plan view near the corner of the backlight device BB line sectional view of FIG. 8 in the liquid crystal display device The top view which expanded the corner vicinity of the backlight apparatus with which the liquid crystal display device which concerns on Embodiment 3 of this invention is equipped. Sectional drawing which expanded the edge part vicinity of the liquid crystal display device which concerns on Embodiment 4 of this invention Sectional drawing which expanded the edge part vicinity of the liquid crystal display device which concerns on Embodiment 5 of this invention. Sectional drawing which expanded the edge part vicinity of the liquid crystal display device which concerns on Embodiment 6 of this invention. Sectional drawing which expanded the edge part vicinity of the liquid crystal display device which concerns on Embodiment 7 of this invention.

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. 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 FIGS. 2, 5 and 6 is the front side, and the lower side is the back side.

  As shown in FIG. 1, a television receiver 10TV according to this embodiment includes a liquid crystal display device 10 having a horizontally long and substantially square shape, and both front and back cabinets 10C1 and 10C2 that are accommodated so as to sandwich the liquid crystal display device 10. , A power source 10P, a tuner (reception unit) 10T that receives a television signal, and a stand 10S. As illustrated in FIG. 2, the liquid crystal display device 10 includes a liquid crystal panel (display panel) 11 that displays an image, and a backlight device (illumination device) 12 that supplies light for display to the liquid crystal panel 11. These are integrally held by a frame-like bezel 13 or the like.

  Next, the liquid crystal panel 11 and the backlight device 12 constituting the liquid crystal display device 10 will be described sequentially. Among these, as shown in FIG. 1, the liquid crystal panel (display panel) 11 has a horizontally long rectangular shape when seen in a plan view, and a pair of glass substrates are bonded together with a predetermined gap therebetween, The liquid crystal is sealed between both glass substrates. On one glass substrate (array substrate, active matrix substrate), a switching element (for example, TFT) connected to the source wiring and gate wiring orthogonal to each other, a pixel electrode connected to the switching element, an alignment film, etc. The other glass substrate (counter substrate, CF substrate) is provided with a color filter in which colored portions such as R (red), G (green), and B (blue) are arranged in a predetermined arrangement. Are provided with a light-shielding portion, an alignment film, and the like. As shown in FIG. 2, the liquid crystal panel 11 has a display surface 11DS capable of displaying an image, and the central side portion of the display surface 11DS is a display area where an image is displayed. On the other hand, the outer peripheral portion is a frame-like non-display area surrounding the display area. A polarizing plate is disposed outside each of the glass substrates.

  Next, the backlight device 12 will be described in detail. As shown in FIG. 2, the backlight device 12 includes a chassis 14 that has a light emitting portion 14B that opens to the front side (light emitting side, liquid crystal panel 11 side) and has a substantially box shape, and a light emitting portion 14B of the chassis 14. And an optical member 15 disposed so as to cover the frame, and a frame 16 disposed along the outer edge portion of the chassis 14 and holding the outer edge portion of the optical member 15 between the chassis 14 and the frame 16. Further, in the chassis 14, an LED (light source) 17, an LED substrate (light source substrate) 18 on which the LED 17 is mounted, and a reflection that is arranged between the LED 17 and the optical member 15 to reflect the light in the chassis 14. A plate 19 is provided. Thus, the backlight device 12 according to the present embodiment is a so-called direct type in which the LEDs 17 are arranged in the chassis 14 immediately below the liquid crystal panel 11 and the optical member 15. Below, each component of the backlight apparatus 12 is demonstrated in detail.

  The chassis 14 is made of, for example, a metal plate such as an aluminum plate or an electrogalvanized steel plate (SECC). As shown in FIGS. 2 and 3, the chassis 14 has a horizontally long rectangular shape (rectangular shape, rectangular shape). A bottom plate portion (bottom portion) 14A, and a side plate portion (side portion) 14C rising from the outer end portion of each side (a pair of long sides and a pair of short sides) of the bottom plate portion 14A toward the front side (light emission side); The receiving plate portion (optical member support portion) 14D projecting outward from the rising end of each side plate portion 14C, and the standing plate portion 14E rising from the outer end portion of the receiving plate portion 14D toward the front side. As a shallow, nearly box-shaped opening to the front. The long side direction of the chassis 14 matches the X-axis direction, and the short side direction matches the Y-axis direction. The bottom plate portion 14 </ b> A is disposed on the back side with respect to the LED substrate 18, that is, on the side opposite to the light output side with respect to the LED 17. Each side plate portion 14C is inclined with respect to the bottom plate portion 14A. Each receiving plate portion 14D can support the outer end portions of the optical member 15 and the reflecting plate 19 placed from the front side. Each receiving plate portion 14D is connected to the outer end portion of the bottom plate portion 14A via each side plate portion 14C. Each standing plate portion 14E is opposed to the optical member 15 and the end surface of the reflection plate 19 placed on each receiving plate portion 14D, and a frame 16 to be described later is fixed.

  Like the liquid crystal panel 11 and the chassis 14, the optical member 15 has a horizontally long rectangular shape in a plan view, and as shown in FIG. 2, the outer end portion thereof is supported by the receiving plate portion 14D. The light output part 14B of the chassis 14 is covered and disposed between the liquid crystal panel 11 and the LED 17. The optical member 15 is opposed to the LED 17 on the front side, that is, the light output side with a predetermined interval in the Z-axis direction (front direction). The optical member 15 is arranged on the front side relatively with the first optical member 15A disposed on the relatively back side (the LED 17 side and the side opposite to the light output side) and the frame 16 with respect to the first optical member 15A. The second optical member 15B. The first optical member 15 </ b> A is placed so that the outer end portion thereof overlaps the front side with respect to the receiving plate portion 14 </ b> D of the chassis 14. The first optical member 15 </ b> A includes a diffusion plate 20 and a wavelength conversion sheet 21. Among these, the diffusing plate 20 has a structure in which a large number of diffusing particles are dispersed in a substantially transparent resin base material having a predetermined thickness, and has a function of diffusing transmitted light. The wavelength conversion sheet 21 will be described in detail later.

  The second optical member 15B is placed so that the outer end portion of the second optical member 15B is superposed on the front side with respect to the frame 16, and an interval corresponding to the thickness of the frame 16 is provided between the second optical member 15B and the first optical member 15A. The second optical member 15 </ b> B includes a prism sheet (lens sheet) 22 and a reflective polarizing sheet 23 stacked on the front side of the prism sheet 22. The prism sheet 22 includes a sheet-like base material and a prism portion provided on the front surface of the base material. The prism portion is composed of a plurality of unit prisms extending in the long side direction (X-axis direction) and arranged in the short side direction (Y-axis direction). By including such a prism portion, the prism sheet 22 selectively collects light from the first optical member 15A side in the unit prism arrangement direction (Y-axis direction) (anisotropic light collection action). ). The reflective polarizing sheet 23 includes a reflective polarizing film and a pair of diffusion films that sandwich the reflective polarizing film from the front and back. The reflective polarizing film has, for example, a multilayer structure in which layers having different refractive indexes are alternately stacked, and transmits p-waves of light from the prism sheet 22 and reflects s-waves to the back side. The s wave reflected by the reflective polarizing film is reflected again to the front side by a reflection plate 19 or the like, which will be described later, and at that time, separated into s wave and p wave. As described above, the reflective polarizing sheet 23 includes the reflective polarizing film, so that the s-wave absorbed by the polarizing plate of the liquid crystal panel 11 is reflected to the back side (the reflective plate 19 side). It can be used effectively and the light use efficiency (luminance) can be increased. The pair of diffusing films are made of a transparent synthetic resin material such as polycarbonate resin, and an embossing process for imparting a diffusing action to light is performed on the surface opposite to the reflective polarizing film side.

  The frame 16 is made of a synthetic resin and is painted white so as to have light reflectivity. As shown in FIG. 2, the frame 16 has a frame shape along the outer peripheral edge of the liquid crystal panel 11 and the optical member 15 as a whole. . The frame 16 is opposed to each receiving plate portion 14D and has an inner frame portion 16A that sandwiches the outer end portion of the first optical member 15A between each receiving plate portion 14D and an outer end of the inner frame portion 16A. And an outer frame portion 16B that protrudes toward the back side and faces the outer surface of the upright plate portion 14E. The inner frame portion 16A presses the outer end portion of the wavelength conversion sheet 21 constituting the first optical member 15A from the side opposite to the receiving plate portion 14D side. The inner frame portion 16A sandwiches the outer end portions of the liquid crystal panel 11 and the second optical member 15B with the bezel 13.

  Next, the LED 17 and the LED substrate 18 on which the LED 17 is mounted will be described. The LED 17 is a so-called top-view type (top view type) in which the LED 17 is surface-mounted on the LED substrate 18 and the light emitting surface 17A faces away from the LED substrate 18 side. It coincides with the axial direction, that is, the normal direction (front direction) to the display surface 11DS of the liquid crystal panel 11 (the plate surface of the optical member 15). The “optical axis” referred to here is an axis that coincides with the traveling direction of light having the highest light emission intensity (peak) among the light emitted from the LED 17. Specifically, the LED 17 has a blue LED element (blue light emitting element) that emits blue light as a light source sealed in a case with a sealing material, and the sealing material is excited by blue light from the blue LED element. And a red phosphor (not shown) that emits red light. Therefore, the LED 17 is a mixture of blue light (blue component light) emitted from the blue LED element and red light (red component light) emitted from the red phosphor when excited by the blue light of the blue LED element. It is possible to emit magenta light as a whole. A part of the magenta light emitted from the LED 17 is wavelength-converted into green light by a wavelength conversion sheet 21 described later in detail. Therefore, the light emitted from the backlight device 12 is substantially white due to the additive color mixture of the green light wavelength-converted by the wavelength conversion sheet 21 and the magenta color light of the LED 17. The blue LED element provided in the LED 17 is a semiconductor made of a semiconductor material such as InGaN, for example, and blue monochromatic light having a wavelength included in a blue wavelength region (about 420 nm to about 500 nm) when a voltage is applied in the forward direction. Is supposed to emit light. This blue LED element is connected to a wiring pattern on the LED substrate 18 arranged outside the case by a lead frame (not shown). The red phosphor emits blue light of the blue LED element as excitation light and light in a wavelength region (about 600 nm to about 780 nm) belonging to red, that is, red light as fluorescent light.

  As shown in FIGS. 2 and 3, the LED substrate 18 is accommodated in the chassis 14 so as to overlap the front side of the bottom plate portion 14 </ b> A. The LED 17 having the above-described configuration is surface-mounted on the front surface of the LED substrate 18 (the surface facing the optical member 15 side), and this is the mounting surface 18A. The LEDs 17 are arranged in parallel in a matrix (matrix, grid) along the X-axis direction and the Y-axis direction in the surface of the mounting surface 18A of the LED substrate 18, and the surface of the mounting surface 18A. The wiring patterns formed inside are electrically connected to each other. The arrangement pitch of the LEDs 17 on the LED substrate 18 is substantially constant. Specifically, the LEDs 17 are arranged at substantially equal intervals in the X-axis direction (row direction) and the Y-axis direction (column direction). The LED substrate 18 is made of the same metal as the chassis 14 such as an aluminum material, and a wiring pattern (not shown) made of a metal film such as a copper foil is formed on the surface of the LED substrate 18 via an insulating layer. It is set as the structure by which the reflective layer (not shown) which exhibits white was formed in the outermost surface. By reflecting the light existing in the space between the LED substrate 18 and the reflection plate 19 by this reflection layer, the light use efficiency can be enhanced. Such a reflective layer is preferably provided also on the inner surface of the chassis 14. In addition, as a material used for the LED substrate 18, an insulating material such as ceramic can also be used. Further, the LED board 18 is provided with a connector portion to which a wiring member (not shown) is connected, and driving power is supplied from an LED driving board (light source driving board) (not shown) via the wiring member. Yes.

  As shown in FIGS. 2 and 3, the reflector 19 is arranged on the front side with respect to the LED 17 and on the back side with respect to the optical member 15 (including the wavelength conversion sheet 21) with an interval in the Z-axis direction. ing. Since the reflecting plate 19 has a size laid over almost the entire inner surface of the chassis 14, the LED substrate 18 disposed in the chassis 14 extends from the front side (light emission side, optical member 15 side) over almost the entire area. It is possible to cover. The reflection plate 19 extends along the LED substrate 18 (bottom plate portion 14A) and has a reflection bottom portion 19A having a size that overlaps almost the entire area of the LED substrate 18 in plan view, and each outer end of the reflection bottom portion 19A. The four reflecting side portions (reflecting inclined side portions) 19B that rise from the portion toward the front side (the wavelength conversion sheet 21 side) and are inclined with respect to the reflecting bottom portion 19A, and outward from the outer ends of the reflecting side portions 19B And an extending portion 19C mounted on the receiving plate portion 14D of the chassis 14. The reflection bottom 19 </ b> A of the reflection plate 19 is disposed so as to be interposed between the LED substrate 18, the plurality of LEDs 17 mounted thereon, and the optical member 15 with an interval in the Z-axis direction. The reflection side portion 19B is disposed so as to be interposed between the side plate portion 14C of the chassis 14 and the optical member 15 with an interval in the Z-axis direction. Here, the distance between the reflection bottom 19 </ b> A and the optical member 15 (wavelength conversion sheet 21) is substantially constant regardless of the distance from the LED 17. On the other hand, the distance between the reflection side portion 19B and the optical member 15 tends to become shorter as the distance from the LED 17 increases. For this reason, the optical path length until the reflected light from the reflection side portion 19B reaches the optical member 15 also tends to become shorter as the distance from the LED 17 increases. The extending part 19 </ b> C is arranged to be sandwiched between the receiving plate part 14 </ b> D of the chassis 14 and the optical member 15 in the Z-axis direction. Note that the inner frame portion 16A of the frame 16 protrudes inward from the extending portion 19C. The extended portion 19C is in a state where the entire area is covered by the inner frame portion 16A when viewed in plan.

  The reflection plate 19 is made of a synthetic resin, and has a reflection substrate 24 whose surface is white with excellent light reflectivity. The reflection substrate 24 does not absorb light of a specific wavelength on the surface thereof, and diffusely reflects all visible rays, and the light reflectance is substantially constant over the entire area. As shown in FIGS. 2 and 3, the reflective substrate 24 is provided with an opening 24 </ b> A that partially penetrates in the normal direction (plate thickness direction) of the plate surface. In the present embodiment, the opening 24A has a circular shape when viewed in plan. The opening 24A constitutes a light transmission part 25 that transmits light. Therefore, the non-formation part of the light transmission part 25 (opening part 24A) of the reflective substrate 24 comprises the light reflection part 26 which reflects light. As described above, the reflection plate 19 has the light transmission portion 25 and the light reflection portion 26 in the plate surface, and the in-plane distribution thereof changes according to the positional relationship with the LED 17. Specifically, the light transmission portion 25 has an in-plane distribution in which the area ratio increases as the distance from the LED 17 increases, and the area ratio decreases as the distance from the LED 17 decreases. On the other hand, the light reflecting portion 26 has an in-plane distribution in which the area ratio decreases as the distance from the LED 17 increases, and the area ratio increases as the distance from the LED 17 increases.

  As shown in FIG. 3, the optical member 15 and the reflection plate 19 described above have an LED arrangement area (light source arrangement area) LA in which a plurality of LEDs 17 are arranged in the center side portion in the plane. The outer peripheral end portion (outer end portion) is an LED non-arrangement area (light source non-arrangement area) LNA in which the plurality of LEDs 17 are not arranged. In FIGS. 3 and 4, the frame-shaped one-dot chain line represents the outer shape of the LED arrangement area LA, and the area outside the one-dot chain line is the LED non-arrangement area LNA. Of the reflection plate 19, the reflection bottom 19A is disposed across the LED arrangement area LA and the LED non-arrangement area LNA, whereas the reflection side part 19B and the extension part 19C are entirely disposed in the LED non-arrangement area. Arranged in LNA. More specifically, the central portion of the reflective bottom portion 19A is the LED placement region LA, while the frame-shaped outer peripheral end portion surrounding the LED placement region LA is the central portion of the LED non-placement region LNA. The The reflection side portion 19B and the extension portion 19C are the outer peripheral end side portions arranged outside the center side portion in the LED non-arrangement region LNA. In the reflection plate 19, the light transmission part 25 (opening 24A) is distributed such that the area ratio in the LED non-arrangement region LNA is high and the area ratio in the LED arrangement region LA is low. More specifically, the plurality of openings 24A constituting the plurality of light transmission portions 25 have the smallest diameter dimension that is arranged to overlap with the LEDs 17 in the reflection bottom portion 19A that is the LED arrangement region LA, and from the LEDs 17. As the distance increases, the diameter dimension increases, and the diameter dimension of what is disposed on the reflection side portion 19B which is the LED non-arrangement region LNA is the maximum. Of these, the openings 24A having the largest diameter are arranged in a line along the length direction (X-axis direction or Y-axis direction) in each of the four reflection side portions 19B. Yes. On the other hand, the light reflecting portions 26 (locations where the opening 24A is not formed) are distributed such that the area ratio in the LED arrangement region LA is high and the area ratio in the LED non-arrangement region LNA is low. According to such a configuration, in the LED arrangement area LA, most of the light from the LED 17 is reflected by the light reflecting portion 26, so that it is difficult to emit to the wavelength conversion sheet 21 side, whereas the LED non-arrangement area LNA Then, most of the light from the LED 17 is easily emitted to the wavelength conversion sheet 21 side through the light transmission part 25. Thereby, the amount of light irradiated to the wavelength conversion sheet 21 is made uniform.

Next, the wavelength conversion sheet 21 will be described in detail. As shown in FIG. 2, the wavelength conversion sheet 21 has a rectangular shape similar to the liquid crystal panel 11 and the like, and is approximately the same size as the diffusion plate 20 of the first optical member 15A. The wavelength conversion sheet 21 is in the form of a sheet that is thinner (thin) than the diffusion plate 20. The wavelength conversion sheet 21 is a pair of phosphor layers (wavelength conversion layers) containing a phosphor (wavelength conversion material) for wavelength-converting light from the LED 17 and a phosphor layer sandwiched from the front and back to protect it. And a protective layer. In the phosphor layer, a green phosphor that emits green light (wavelength range of about 500 nm to about 570 nm) using blue light contained in magenta light from the LED 17 as excitation light is dispersed and blended. Thereby, the emitted light of the backlight device 12 includes blue light and red light emitted from the LED 17, and green light whose wavelength is converted by the green phosphor included in the wavelength conversion sheet 21, and as a whole. It becomes white light. As such a green phosphor, those having a relatively sharp emission spectrum are preferable. For example, sulfide phosphors such as “SrGa ₂ S ₄ : Eu ²⁺ ” are used. In the wavelength conversion sheet 21 according to the present embodiment, the distribution density of the phosphor contained in the phosphor layer is substantially uniform in the plane. In this way, it is preferable to reduce the manufacturing cost of the wavelength conversion sheet 21 as compared with the conventional case where the in-plane distribution of the phosphor is changed according to the distance from the LED 17.

  The optical action of the optical member 15 (mainly the wavelength conversion sheet 21) will be described. First, as shown in FIG. 2, magenta light composed of blue light and red light is emitted as primary light from the light emitting surface 17A of the LED 17 constituting the LED 17. The primary light from the LED 17 is given a diffusing action by the diffusing particles contained in the diffusing plate 20 constituting the first optical member 15 </ b> A, and then a part thereof enters the wavelength conversion sheet 21 on the diffusing plate 20. . Of the primary light incident on the wavelength conversion sheet 21, part of the blue light is wavelength-converted by the green phosphor in the wavelength conversion sheet 21 and emitted as green light (secondary light). From the wavelength conversion sheet 21, blue light and red light transmitted without wavelength conversion are emitted together with green light. Thus, the primary light (blue light, red light) from the LED 17 and the secondary light (green light) obtained after wavelength conversion are emitted from the wavelength conversion sheet 21, so that white light is emitted. It is formed. The light emitted from the wavelength conversion sheet 21 is incident on the second optical member 15B, and is emitted to the liquid crystal panel 11 with the respective optical actions provided by the prism sheet 22 and the reflective polarizing sheet 23 constituting the second optical member 15B. To do.

  By the way, in the backlight device 12 having the above-described configuration, the reflection plate 19 is interposed between the LED 17 and the wavelength conversion sheet 21, and the reflection plate 19 is light whose in-plane distribution changes according to the positional relationship with the LED 17. By having the transmission part 25 and the light reflection part 26, the light quantity related to the primary light of the LED 17 irradiated on the wavelength conversion sheet 21 is made uniform. However, in particular, in the large-sized backlight device 12, unevenness is likely to occur in the in-plane distribution of the light amount related to the primary light of the LED 17 that is irradiated onto the wavelength conversion sheet 21. That is, in the LED arrangement area LA, the primary light of the LED 17 that is irradiated onto the wavelength conversion sheet 21 is sufficiently secured, so that the secondary light that is emitted after being wavelength-converted by the wavelength conversion sheet 21 and the wavelength conversion sheet The light quantity ratio between the primary light emitted without being wavelength-converted at 21 is appropriate, and color unevenness is less likely to occur. On the other hand, in the LED non-arrangement region LNA, the primary light of the LED 17 irradiated on the wavelength conversion sheet 21 tends to be insufficient. In contrast, the distribution density of the phosphors contained in the phosphor layer of the wavelength conversion sheet 21 is substantially uniform, and the LED non-arrangement region LNA contains a phosphor equivalent to the LED arrangement region LA. For this reason, in the LED non-arrangement region LNA, most of the primary light of the LED 17 irradiated to the wavelength conversion sheet 21 is wavelength-converted into secondary light by the phosphor, and the light quantity ratio of the secondary light is changed to the wavelength conversion sheet 21. Therefore, it tends to be larger than the light quantity ratio of the primary light emitted without being wavelength-converted. Therefore, the emitted light of the wavelength conversion sheet 21 is white light with almost no specific color in the LED arrangement area LA, but the same color as the secondary light wavelength-converted by the phosphor in the LED non-arrangement area LNA. Or, the light has a similar color, i.e., greenish light, and color unevenness is likely to occur.

  Therefore, in the backlight device 12 according to the present embodiment, the light emission path until the light from the LED 17 is emitted to the outside has the same color as the light from the LED 17 or the light as shown in FIGS. 3 and 4. A colored portion 27 that exhibits the same color as each primary color light that constitutes is arranged so as to overlap with a part of the LED non-arrangement region LNA. In FIGS. 3 and 4, the colored portion 27 is shown in a shaded shape. In the light source non-arrangement region LNA, although the light amount of the primary light of the LED 17 irradiated on the wavelength conversion sheet 21 tends to be small, it exhibits the same color as the primary light of the LED 17 or the primary color light constituting the light. Light can be supplemented by the colored portion 27. This makes it difficult for the primary light of the LED 17 irradiated to the wavelength conversion sheet 21 to be insufficient in the LED non-arrangement region LNA. Therefore, the secondary light emitted after being wavelength-converted by the wavelength conversion sheet 21 and the wavelength conversion sheet The light quantity ratio between the primary light emitted without being wavelength-converted at 21 is optimized, and the occurrence of color unevenness is suppressed.

  The coloring unit 27 will be described in detail. First, as shown in FIGS. 4 to 6, the color portion 27 is provided on the reflection plate 19. If it does in this way, the light colored by the coloring part 27 provided in the reflecting plate 19 can be reflected by the reflecting plate 19 and can be irradiated to the wavelength conversion sheet 21. Since the reflecting plate 19 originally requires processing such as forming the opening 24A in the reflecting substrate 24 in order to transmit part of the light, processing for providing the coloring portion 27 on the reflecting plate 19 is performed. By doing so, compared with the case where a colored portion is provided in the wavelength conversion sheet 21 or the like, it is suitable for cost reduction. The colored portion 27 is provided on a plate surface facing the front side (the wavelength conversion sheet 21 side) of the reflection plate 19. In this way, the light reflected by the optical member 15 including the wavelength conversion sheet 21 can be directly colored by the coloring unit 27 and reflected again by the reflecting plate 19 to be directed to the wavelength conversion sheet 21. it can. Temporarily, compared with the case where a coloration part is provided in the plate | board surface which faced the back side (LED17 side) in the reflecting plate 19, the light provided with the coloration effect | action by the coloration part 27 is efficiently made into the wavelength conversion sheet 21. Can be irradiated.

  The colored portion 27 exhibits a color close to the color of light of the LED 17 in comparison with the reflecting plate 19. That is, with respect to the white reflective plate 19 (reflective substrate 24), the color forming unit 27 exhibits a light color of the LED 17, that is, a magenta color. The colored portion 27 is formed of a coating film formed by applying a magenta paint (including a pigment or a dye) on the surface of the reflector 19 using a known coating technique (for example, a printing technique). . The color developing unit 27 has an absorptance of light (green light) of a color complementary to the color of light (magenta light) emitted from the LED 17, and the light (magenta light (blue light, red light) emitted from the LED 17. It is higher than the absorption rate of light)). In addition, the coloration unit 27 reflects light (magenta light (green light)) in which the reflectance of light emitted from the LED 17 (magenta light (blue light, red light)) has a complementary color relationship with the light emitted from the LED 17. It is higher than the reflectance. That is, the color forming unit 27 has a function of absorbing green light and reflecting magenta light (blue light, red light). Thereby, the light (for example, white return light) reflected by the coloring unit 27 is magenta compared to the case where it is reflected by the white part (reflecting plate 19) where the coloring unit 27 is not provided. Will be charged. Further, the surface of the reflecting plate 19 exhibiting white color is exposed from the portion where the colored portion 27 is not formed.

  As shown in FIG. 4, the color portion 27 has a substantially circular dot shape in plan view, and is provided exclusively on the reflection side portion 19 </ b> B of the reflection plate 19. Here, as described above, the optical path length until the reflected light from the reflection side portion 19B reaches the wavelength conversion sheet 21 tends to become shorter as the distance from the LED 17 increases. By providing the coloration portion 27 on the reflection side portion 19B, the magenta light imparted with the coloration action by the coloration portion 27 is reflected by the reflection side portion 19B and efficiently applied to the wavelength conversion sheet 21. Irradiated. Accordingly, it is possible to reduce the area of the colored portion 27 provided on the reflection side portion 19B. Since the coloration unit 27 becomes a factor that deteriorates the light utilization efficiency, the deterioration of the light utilization efficiency can be suppressed by reducing the area. The colored portion 27 is disposed at a position separated from the light transmitting portion 25 (opening 24A) in the reflection side portion 19B. That is, since the coloration unit 27 is provided exclusively in the light reflection unit 26, the light imparted with the coloration function by the coloration unit 27 is reflected by the light reflection unit 26 and efficiently applied to the wavelength conversion sheet 21. Can be irradiated. In the reflection plate 19 according to the present embodiment, the light transmission part 25 is disposed so as to be sufficiently separated from the outer end of the reflection plate 19, and a sufficient space is provided between the adjacent light transmission parts 25. That is, since a sufficient space for installing the colored portion 27 is secured around the light transmitting portion 25, the colored portion 27 can be appropriately installed with respect to the light reflecting portion 26. More specifically, two color portions 27 are provided along the width direction of the reflection side portion 19B at positions between the adjacent light transmission portions 25 in the length direction of the reflection side portion 19B. In addition, the coloration portion 27 is arranged in the width direction (X-axis direction) of each reflection side portion 19B on the short side with respect to each light transmission portion 25 in the pair of reflection side portions 19B on the short side. It is provided at a position separated from the end side (the side opposite to the reflection bottom 19A side). In addition, the coloration portion 27 is also provided at a position away from the outer end side in the oblique directions of the X-axis direction and the Y-axis direction with respect to the respective light transmission portions 25 arranged at the corner positions of the four corners. In addition, although the diameter part (size) and the density | concentration (color density) are substantially the same, the coloration part 27 which concerns on this embodiment is not necessarily the limitation. That is, it is also possible to adopt a design in which the diameter and density of the colored portion 27 are appropriately changed according to the arrangement according to various conditions such as the light distribution of the LED 17.

  As described above, the backlight device (illumination device) 12 according to the present embodiment includes the LED (light source) 17 and at least a part of the light emitted from the LED 17, which is arranged on the light-emitting side with respect to the LED 17. A wavelength conversion sheet 21 including a reflection plate 19 that transmits light, and a phosphor that is disposed on the opposite side to the LED 17 side with respect to the reflection plate 19 and that converts a wavelength of at least part of light from the LED 17, An LED arrangement area (light source arrangement area) LA in which the LED 17 is arranged and located on the center side of the wavelength conversion sheet 21 and the reflection plate 19, and an LED 17 located on the outer end side of the wavelength conversion sheet 21 and the reflection plate 19. LED non-arrangement area (light source non-arrangement area) LNA and LED non-arrangement area in the light emission path until the light from LED 17 is emitted to the outside It has been arranged so as to overlap with part of NA, comprising light and the same color from LED 17, or the colored portion 27 exhibiting a primary color lights of the same color that constitutes the light.

  In this way, the light emitted from the LED 17 is transmitted directly through the reflection plate 19 or after being reflected by the reflection plate 19. The light transmitted through the reflection plate 19 is applied to the wavelength conversion sheet 21, and at the time of passing through the wavelength conversion sheet 21, at least a part of the light is wavelength-converted by the phosphor and emitted to the outside. Here, in the LED arrangement region LA that is located on the center side of the wavelength conversion sheet 21 and the reflection plate 19 and in which the LED 17 is arranged, the light of the LED 17 that is irradiated to the wavelength conversion sheet 21 is sufficiently secured. Therefore, in the LED arrangement region LA, the light quantity ratio between the light emitted after being wavelength-converted by the wavelength conversion sheet 21 and the light emitted without being wavelength-converted by the wavelength conversion sheet 21 is appropriate, Color unevenness is less likely to occur. On the other hand, in the LED non-arrangement region LNA that is located on the outer end side of the wavelength conversion sheet 21 and the reflection plate 19 and in which the LED 17 is not disposed, the light of the LED 17 that is irradiated to the wavelength conversion sheet 21 tends to be insufficient. ing. For this reason, in the LED non-arrangement region LNA, the light amount ratio of light emitted after wavelength conversion by the wavelength conversion sheet 21 is larger than the light amount ratio of light emitted without wavelength conversion by the wavelength conversion sheet 21. The color unevenness tends to occur due to the tendency.

  On the other hand, in the light emission path until the light from the LED 17 is emitted to the outside, the color forming portion 27 exhibiting the same color as the light from the LED 17 or the same color as each primary color light constituting the light is provided in the LED non-arrangement region. Since it is arranged so as to overlap with a part of the LNA, the color forming unit 27 emits light having the same color as the light of the LED 17 that tends to be insufficient in the LED non-arrangement region LNA or the same color as each primary color light constituting the light. Can be supplemented. Thereby, since it becomes difficult for the light of the LED 17 irradiated to the wavelength conversion sheet 21 to be short in the LED non-arrangement region LNA, the light emitted after being wavelength-converted by the wavelength conversion sheet 21 and the wavelength conversion sheet 21 The ratio of the amount of light emitted without being wavelength-converted is optimized, thereby suppressing the occurrence of color unevenness.

  In addition, the colored portion 27 is provided on the reflection plate 19. If it does in this way, the light colored by the coloring part 27 provided in the reflecting plate 19 can be reflected by the reflecting plate 19 and can be irradiated to the wavelength conversion sheet 21. Since the reflecting plate 19 may naturally require processing for transmitting a part of the light, by performing processing for providing the colored portion 27 on the reflecting plate 19, the wavelength is temporarily assumed. Compared to the case where a color portion is provided in the conversion sheet 21 or the like, it is preferable in terms of cost reduction.

  In addition, the colored portion 27 is provided on the plate surface of the reflecting plate 19 on the wavelength conversion sheet 21 side. In this way, when the light reflected by the wavelength conversion sheet 21 or the like is generated, the reflected light is directly colored by the coloring unit 27 and reflected again by the reflection plate 19 to be reflected by the wavelength conversion sheet 21. Can be headed to. Temporarily, the wavelength conversion sheet | seat 21 can be efficiently irradiated to the light to which the coloring action was provided by the coloring part 27 compared with the case where the coloring part is provided in the board | plate surface by the side of LED17 in the reflecting plate 19. FIG. .

  Further, the reflection plate 19 includes a light reflecting portion 26 that reflects light and a light transmitting portion 25 that transmits light, and the color changing portion 27 is provided in the light reflecting portion 26 and transmits light. It is arranged at a position separated from the portion 25. In this way, by providing the color reflecting portion 27 in the light reflecting portion 26, the light imparted with the coloring action by the color coloring portion 27 is reflected by the light reflecting portion 26 and directed toward the wavelength conversion sheet 21. be able to. When installing the coloration part 27 in the light reflection part 26, it is suitable when the installation space of the coloration part 27 can fully be ensured, and installing the coloration part 27 appropriately with respect to the light reflection part 26 is preferable. it can.

  Further, the reflection plate 19 rises toward the wavelength conversion sheet 21 side while being inclined to the outer end side from the reflection bottom portion 19A and disposed at the reflection bottom portion 19A disposed at least in the LED arrangement region LA. And the color side 27 is provided at least on the reflection side 19B. In this way, the distance between the reflection side portion 19B and the wavelength conversion sheet 21 tends to become shorter as the distance from the LED 17 increases, so that the reflected light from the reflection side portion 19B reaches the wavelength conversion sheet 21. The optical path length also tends to become shorter as the distance from the LED 17 increases. By providing the coloration portion 27 on the reflection side portion 19B, the light imparted with the coloration action by the coloration portion 27 is reflected by the reflection side portion 19B and efficiently irradiated to the wavelength conversion sheet 21. Accordingly, it is possible to reduce the area of the colored portion 27 provided on the reflection side portion 19B. Since the coloration unit 27 becomes a factor that deteriorates the light utilization efficiency, the deterioration of the light utilization efficiency can be suppressed by reducing the area.

  Further, the reflection plate 19 includes a light reflecting portion 26 that reflects light and a light transmitting portion 25 that transmits light. The light reflecting portion 26 is in the LED placement area LA rather than the LED non-placement area LNA. Is provided so that the area ratio is higher, and the light transmitting portion 25 is provided such that the area ratio of the non-LED arrangement area LNA is higher than that of the LED arrangement area LA. In this way, the reflecting plate 19 has a high area ratio of the light reflection part 26 in the LED arrangement area LA and a low area ratio of the light transmission part 25, whereas the light reflection in the non-LED arrangement area LNA. The area ratio of the part 26 is low, and the area ratio of the light transmission part 25 is high. Accordingly, in the LED arrangement area LA, most of the light from the LED 17 is reflected by the light reflecting portion 26 and is difficult to be emitted to the wavelength conversion sheet 21 side, whereas in the LED non-arrangement area LNA, the light from the LED 17 is not emitted. Most of the light passes through the light transmitting portion 25, so that the light is easily emitted to the wavelength conversion sheet 21 side. Thereby, the amount of light irradiated to the wavelength conversion sheet 21 is made uniform.

  The reflection plate 19 includes a reflection substrate 24 that reflects light, and a light transmission portion 25 that transmits light is formed by partially opening the reflection substrate 24, whereas the reflection substrate 24 is formed. Among these, the non-formation part of the light transmission part 25 comprises the light reflection part 26 which reflects light. In this way, the light transmitting portion 25 can be formed by partially opening the reflecting substrate 24, and the portion of the reflecting substrate 24 that is not opened becomes the light reflecting portion 26. As a result, the positional accuracy and dimensional accuracy of the light transmitting portion 25 formed of the opening (opening) 24A of the reflective substrate 24 become high. It can be demonstrated appropriately.

  Further, the LED 17 emits magenta light including blue light and red light, and the wavelength conversion sheet 21 includes a green phosphor that converts blue light into green light as a phosphor. In this way, since the magenta light emitted from the LED 17 includes blue light and red light, the blue light included in the magenta light is green light when passing through the wavelength conversion sheet 21. Is converted into a wavelength. Thereby, the emitted light of the backlight device 12 includes blue light, green light, and red light, and becomes white light as a whole.

  The liquid crystal display device (display device) 10 according to the present embodiment includes the backlight device 12 described above and a liquid crystal panel (display panel) 11 that displays an image using light emitted from the backlight device 12. And comprising. According to such a liquid crystal display device 10, it is difficult for color unevenness to occur in the light emitted from the backlight device 12, so that excellent display quality with suppressed color unevenness can be obtained.

  The television receiver 10TV according to the present embodiment includes the liquid crystal display device 10 described above. According to such a television receiver 10TV, since the display quality of the liquid crystal display device 10 is excellent, it is possible to realize display of a television image with excellent display quality.

<Embodiment 2>
A second embodiment of the present invention will be described with reference to FIGS. In this Embodiment 2, what changed the structure of the coloring part 127 is shown. In addition, the overlapping description about the same structure, operation | movement, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

  As shown in FIGS. 7 to 9, the color portion 127 according to the present embodiment is disposed so as to surround the light transmitting portion 125 provided on the reflection side portion 119 </ b> B of the reflection plate 119. It has an annular shape following the outer shape of the transmission part 125. In other words, the color changing portion 127 is provided in the light reflecting portion 126 so as to overlap with the opening edge of the opening portion 124 </ b> A constituting the light transmitting portion 125. In the present embodiment, the reflecting plate 119 has a shorter distance between the light transmitting portion 125 and the outer end of the reflecting plate 119 than that in the first embodiment, and the interval between the adjacent light transmitting portions 125 is smaller. Compared to the first embodiment described above, it is narrower. That is, although it is difficult to secure a space for installing the coloring portion 127 around the light transmitting portion 125, the coloring portion 127 is provided so as to surround the light transmitting portion 125. 127 can be properly installed.

  As described above, according to the present embodiment, the reflection plate 119 includes the light reflection unit 126 that reflects light and the light transmission unit 125 that transmits light. It is provided in the reflection part 126 and is arranged so as to surround the light transmission part 125. In this way, by providing the color reflecting portion 127 in the light reflecting portion 126, the light imparted with the color action by the color coloring portion 127 is reflected by the light reflecting portion 126 and directed to the wavelength conversion sheet 121. be able to. Even when it is difficult to secure a sufficient installation space for the coloration unit 127 when installing the coloration unit 127 in the light reflection unit 126, the coloration unit 127 can be appropriately installed with respect to the light reflection unit 126. it can.

<Embodiment 3>
A third embodiment of the present invention will be described with reference to FIG. In the third embodiment, the area ratio (size, diameter dimension) of the colored portion 227 is changed from the above-described first embodiment. In addition, the overlapping description about the same structure, operation | movement, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

  As shown in FIG. 10, the color portion 227 according to the present embodiment is formed so that the area ratio of the light reflection portion 226 changes according to the distance from the LED 217. Specifically, the area ratio of the color portion 227 closer to the LED 217 out of the two color portions 227 arranged between the adjacent light transmission portions 225 (opening portions 224A) is the smallest, and the area far from the LED 217 is closer. The area ratio of the colored portion 227 is the next smallest. On the other hand, the area ratio of the color portions 227 adjacent in the oblique directions of the X-axis direction and the Y-axis direction with respect to the respective light transmission portions 225 arranged at the angular positions in the reflection plate 219 is maximized, and the short side of the reflection plate 219 The area ratio of the colored portion 227 adjacent to the outer end side in the X-axis direction with respect to each light transmitting portion 225 disposed on each reflecting side portion 219B is the second largest. Thus, the color ratio 227 has a smaller area ratio as it is closer to the LED 217 (smaller distance), and has a larger area ratio as it is farther from the LED 217 (larger distance). According to such a coloration unit 227, the same magenta color light as the primary light of the LED 217 that tends to be insufficient in the LED non-arrangement region LNA can be efficiently supplemented. In the LED non-arrangement region LNA, a wavelength conversion sheet (not shown) can be provided. The amount of light applied to the light can be made uniform.

  As described above, according to the present embodiment, the colored portion 227 is arranged so that the area ratio becomes larger (higher) as the distance from the LED 217 becomes larger. In the LED non-arrangement region LNA, as the distance from the LED 217 increases, the light of the LED 217 irradiated to the wavelength conversion sheet tends to decrease. In that respect, the coloration unit 227 is arranged so that the area ratio increases as the distance from the LED 217 increases, and therefore, the color of the LED 217 that tends to be insufficient in the LED non-arrangement region LNA, or configures the light. Light having the same color as each primary color light can be efficiently supplemented, and the amount of light irradiated to the wavelength conversion sheet in the LED non-arrangement region LNA can be made uniform.

<Embodiment 4>
Embodiment 4 of the present invention will be described with reference to FIG. In this Embodiment 4, what changed the installation object of the coloring part 327 from above-mentioned Embodiment 3 is shown. In addition, the overlapping description about the same structure, effect | action, and effect as above-mentioned Embodiment 3 is abbreviate | omitted.

  As shown in FIG. 11, the color forming unit 327 according to the present embodiment is provided in the diffusion plate 320 that is included in the optical member 315 and is arranged on the back side (LED 317 side) with respect to the wavelength conversion sheet 321 in the Z-axis direction. It has been. The colored portion 327 is provided on the back surface of the diffusion plate 320, that is, on the surface facing the LED 317. The colored portions 327 are respectively formed by a technique such as printing magenta paint on the back plate surface of the diffusion plate 320.

  As described above, according to the present embodiment, the diffusion plate (optical member) 320 is provided so as to overlap the wavelength conversion sheet 321 on the reflection plate 319 side. 320 is provided. In this way, the light applied to the diffusing plate 320 is applied to the wavelength conversion sheet 321 after being provided with a coloring action by the color forming unit 327 provided in the diffusing plate 320.

<Embodiment 5>
A fifth embodiment of the present invention will be described with reference to FIG. In the fifth embodiment, the installation target of the coloring unit 427 is changed from the above-described third embodiment. In addition, the overlapping description about the same structure, effect | action, and effect as above-mentioned Embodiment 3 is abbreviate | omitted.

  As shown in FIG. 12, the color forming unit 427 according to the present embodiment is provided on the wavelength conversion sheet 421 included in the optical member 415. The colored portion 427 is provided on the back surface of the wavelength conversion sheet 421, that is, the surface facing the diffusion plate 420. The colored portions 427 are each formed by a technique such as printing a magenta paint on the back side plate surface of the wavelength conversion sheet 421.

  As described above, according to the present embodiment, the color changing portion 427 is provided on the wavelength conversion sheet 421. In this way, the light applied to the wavelength conversion sheet 421 is imparted with a color action by the color forming unit 427 provided on the wavelength conversion sheet 421.

<Embodiment 6>
Embodiment 6 of the present invention will be described with reference to FIG. In the sixth embodiment, a configuration in which the configuration of the reflector 519 is changed from the above-described first embodiment. In addition, the overlapping description about the same structure, operation | movement, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

  As shown in FIG. 13, the reflection plate 519 according to this embodiment includes a transmission substrate 28 that transmits light. The transmission substrate 28 is made of a substantially transparent synthetic resin (for example, PET) plate material. A light reflection portion 526 is partially formed on the plate surface of the transmission substrate 28. The light reflecting portion 526 is made of a white ink (white paint) having excellent light reflectivity. The light reflecting portion 526 is formed by printing, for example, by screen printing, printing using an ink jet device or a dispenser device, or gravure printing on the front surface (wavelength conversion sheet 521 side) of the transmission substrate 28. In addition, the light reflecting portion 526 is formed by depositing a metal thin film on the plate surface of the transmissive substrate 28 by vapor deposition (mask vapor deposition) using a metal material (aluminum, silver, or the like) as the material of the light reflecting portion 526. It is also possible. And the non-formation location of the light reflection part 526 comprises the light transmission part 525 which permeate | transmits light among the transmissive substrates 28. FIG. According to such a configuration, the light transmitting portion 25 and the light reflecting portion 26 are formed by partially forming the opening 24A in the reflecting substrate 24 constituting the reflecting plate 19 as in the first embodiment. Compared to the case (see FIG. 5), the reflector 519 is easily manufactured, which is preferable in reducing the manufacturing cost. In particular, it is useful when the arrangement pattern of the light transmission part 525 and the light reflection part 526 is complicated.

  As described above, according to the present embodiment, the reflection plate 519 includes the transmission substrate 28 that transmits light, and the light reflection portion 526 that partially reflects light is formed on the plate surface of the transmission substrate 28. On the other hand, a portion where the light reflecting portion 526 is not formed in the transmissive substrate 28 constitutes a light transmitting portion 525 that transmits light. In this way, the light reflecting portion 526 can be partially formed by applying ink or the like to the plate surface of the transmissive substrate 28, and the portion of the transmissive substrate 28 where the ink or the like is not applied is the light transmissive portion. 525. As a result, the reflector 519 is easily manufactured, which is suitable for reducing the manufacturing cost. In particular, it is useful when the light reflecting portion 526 and the light transmitting portion 525 are complicated.

<Embodiment 7>
Embodiment 7 of the present invention will be described with reference to FIG. In the seventh embodiment, the configuration of the chassis 614 and the reflection plate 619 is changed from the first embodiment. In addition, the overlapping description about the same structure, operation | movement, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

  As shown in FIG. 14, the chassis 614 according to the present embodiment is configured such that the side plate portion 614 </ b> C rises substantially vertically from the outer end portion of the bottom plate portion 614 </ b> A to the front side. Accordingly, the reflection plate 619 is configured such that the reflection side portion 619B rises substantially vertically from the outer end portion of the reflection bottom portion 619A to the front side and is parallel to the side plate portion 614C. Therefore, compared with Embodiment 1 described above, the reflective bottom portion 619A has an increased area (formation range) in the LED non-arrangement region LNA, whereas the reflection side portion 619B has an area in the LED non-arrangement region LNA. The area is decreasing. In addition to the reflection side portion 619B, the color portion 627 is also provided on the reflection bottom portion 619A. On the other hand, the opening 624A is not formed in the reflection side portion 619B.

<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 each of the above-described embodiments, the case where the coloring portion is selectively provided on any one of the reflecting plate, the diffusing plate, and the wavelength conversion sheet has been described. It may be provided on each of the diffusion plate and the wavelength conversion sheet.
(2) In each of the above-described embodiments, the case where the coloring portion is selectively provided in any one of the chassis, the reflection plate, the diffusion plate, and the wavelength conversion sheet has been described. In addition, a plurality of reflection plates, diffusion plates, and wavelength conversion sheets may be provided.
(3) As a modification of the above-described embodiments, it is possible to add a reflection sheet that covers the surfaces of the chassis and the LED substrate. Since this reflection sheet can repeatedly reflect light with the reflection plate, it is suitable for improving the light utilization efficiency.
(4) In each of the above-described embodiments (excluding Embodiments 4 and 5), the case where the colored portion is provided on the front plate surface of the reflecting plate is shown. However, the colored portion is the back plate surface of the reflecting plate. May be provided.
(5) As a modified example of the above-described sixth embodiment, it is also possible to install a colored portion at a position that overlaps with the light transmission portion (a portion where the light reflection portion is not formed on the transmission substrate).
(6) In each of the above-described embodiments (excluding Embodiments 4 and 5), the case where the colored portions are provided on all of the four reflecting side portions constituting the reflecting plate is shown. A colored portion may be provided in a part of the portion, and a reflective side portion in which the colored portion is not formed may exist.
(7) In addition to the illustrations in the above-described embodiments, the diameter (size, area ratio), arrangement, number of installations, planar shape, etc. of the colored portion can be changed as appropriate. The planar shape in the colored portion is not particularly limited as long as the object of the present invention is not impaired, for example, a polygonal shape such as a quadrangle and a triangular shape, an elliptical shape, and an irregular shape.
(8) As a modification of each of the above-described embodiments, when the colored portion is made of a paint, the concentration can be appropriately changed depending on the arrangement. These designs are preferably performed according to the number of installed LEDs, the arrangement of LEDs, and the like.
(9) In each of the above-described embodiments, the coating portion is exemplified as the coloring portion. However, other than that, for example, cellophane having the same color as the light emitted from the LED may be used as the coloring portion. . However, the colored portion formed of the coating film described in each of the above-described embodiments can be formed using an existing coating apparatus (printing apparatus or the like), and the formation speed is fast and preferable.
(10) In each of the above-described embodiments, a magenta color (that is, the same color as the light emitted from the LED) is used. However, the present invention is not limited to this, and constitutes the light emitted from the LED. It may be a colored portion having the same color as each primary color light. For example, when the light from the LED is magenta color light (blue light, red light), the colored portion (blue colored portion) having the same color as the blue light (an example of the primary color light) constituting the magenta color light and the red light (primary color) A combination of an example of light and a colored portion (red colored portion) of the same color may be used as an alternative to the magenta colored portion.
(11) In each of the above-described embodiments, LEDs that emit magenta light (blue light and red light) are used. In addition, for example, LEDs that emit blue light as primary light are used as phosphors. Alternatively, a wavelength conversion sheet including a green phosphor that converts the wavelength of blue light into green light and a red phosphor that converts the wavelength of blue light into red light may be used. In this case, green light and red light are emitted from the wavelength conversion sheet as the secondary light wavelength-converted by the phosphor. What is necessary is just to make a coloring part exhibit blue of the same color as LED. Further, for example, SrGa ₂ S ₄ : Eu ²⁺ may be used as the green phosphor, and (Ca, Sr, Ba) S: Eu ²⁺ may be used as the red phosphor, for example.
(12) In other cases, an LED that emits blue light as primary light is used, and a wavelength conversion sheet including a yellow phosphor that converts the wavelength of blue light into yellow light is used as the phosphor. Good. In this case, yellow light is emitted from the wavelength conversion sheet as the secondary light wavelength-converted by the phosphor. What is necessary is just to make a coloring part exhibit blue of the same color as LED.
(13) In other cases, an LED that emits purple light may be used, and a wavelength conversion sheet including a yellow phosphor and a green phosphor may be used as the phosphor. In this case, the colored portion may be purple.
(14) In other cases, an LED that emits cyan light may be used, and a wavelength conversion sheet including a red phosphor may be used as the phosphor. In this case, the colored portion may be cyan.
(15) In each of the embodiments described above, the sulfurated phosphor is used as the phosphor of the wavelength conversion sheet. However, the present invention is not limited to this, and for example, a quantum dot phosphor (Quantum Dot Phosphor) may be used. Good. The quantum dot phosphor has discrete energy levels by confining electrons, holes, and excitons in a three-dimensional spatial orientation in a semiconductor crystal having a nano size (for example, a diameter of about 2 nm to 10 nm). By changing the dot size, the peak wavelength (emission color) of the emitted light can be selected as appropriate. In addition, since the quantum dot phosphor easily reacts with oxygen and moisture in the air and deteriorates and uses cadmium or the like as an environmental load substance, the above-described sulfide phosphor is used as the phosphor of the wavelength conversion sheet. Is preferred. The sulfide phosphor is covered with a silicon dioxide film, and it can be said that the reliability is high even in a high-temperature and high-humidity environment by adding a gas absorbing material to the wavelength conversion sheet.
(16) In each of the above-described embodiments, the case where the diffusion plate which is an optical member is laminated on the back side of the wavelength conversion sheet has been shown. However, optical members other than the diffusion plate are arranged on the back side of the wavelength conversion sheet. In some cases, the optical member can be provided with a colored portion.
(17) In each of the above-described embodiments, the case where the chassis is made of metal is illustrated, but the chassis can be made of synthetic resin.
(18) In each of the embodiments described above, the LED is used as the light source, but an organic EL or the like can also be used. Further, the number and arrangement of light sources such as LEDs and organic ELs can be changed as appropriate. In addition, the number of light source boards on which light sources such as LEDs and organic ELs are mounted can be appropriately changed.
(19) In each of the above-described embodiments, the liquid crystal panel and the chassis are illustrated in a vertically placed state in which the short side direction coincides with the vertical direction. However, the liquid crystal panel and the chassis have the long side direction in the vertical direction. Those that are in a vertically placed state matched with are also included in the present invention.
(20) 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)). In addition to the liquid crystal display device for display, the present invention can also be applied to a liquid crystal display device for monochrome display.
(21) In each of the above-described embodiments, the transmissive liquid crystal display device is exemplified. However, the present invention can be applied to a reflective liquid crystal display device and a transflective liquid crystal display device.
(22) In each of the above embodiments, a liquid crystal display device using a liquid crystal panel as an example of the display panel has been exemplified. However, the present invention can also be applied to display devices using other types of display panels.
(23) In each of the above-described embodiments, the television receiver provided with the tuner has been exemplified. However, the present invention can also be applied to a display device that does not include the tuner. Specifically, the present invention can also be applied to a liquid crystal display device used as an electronic signboard (digital signage) or an electronic blackboard.

  DESCRIPTION OF SYMBOLS 10 ... Liquid crystal display device (display device), 10TV ... Television receiver, 11 ... Liquid crystal panel (display panel), 12 ... Backlight device (illumination device), 17, 217, 317 ... LED (light source), 19, 119, 219, 319, 519, 619 ... reflective plate, 19A, 619A ... reflective bottom, 19B, 119B, 219B, 619B ... reflective side, 20, 320, 420 ... diffuser plate (optical member), 21, 121, 321, 421 , 521 ... Wavelength conversion sheet, 24 ... Reflection substrate, 25, 125, 225, 525 ... Light transmission part, 26, 126, 226, 526 ... Light reflection part, 27, 127, 227, 327, 427, 627 ... Coloration , 28 ... Transmission substrate, LA ... LED placement area (light source placement area), LNA ... LED non-placement area (light source non-placement area)

Claims (15)

A light source;
A reflector that is arranged at an interval on the light output side with respect to the light source and transmits at least part of the light emitted from the light source;
A wavelength conversion sheet including a phosphor that is arranged at an interval on the side opposite to the light source with respect to the reflection plate and converts the wavelength of at least a part of light from the light source;
A light source arrangement region in which the light source is arranged on the wavelength conversion sheet and the reflection plate at the center side;
A light source non-arrangement region that is located on the outer end side of the wavelength conversion sheet and the reflector and in which the light source is not arranged,
The light from the light source is arranged so as to overlap with a part of the light source non-arrangement region in the light emission path until the light is emitted to the outside, and the same color as the light from the light source or each primary color light constituting the light A lighting device comprising: a coloring portion exhibiting the same color.   The lighting device according to claim 1, wherein the coloration portion is provided on the reflection plate.   The lighting device according to claim 2, wherein the coloration portion is provided on a plate surface of the reflection plate on the wavelength conversion sheet side. The reflecting plate has a light reflecting portion that reflects light and a light transmitting portion that transmits light,
The lighting device according to claim 3, wherein the coloring portion is provided in the light reflecting portion and is disposed at a position separated from the light transmitting portion. The reflecting plate has a light reflecting portion that reflects light and a light transmitting portion that transmits light,
The lighting device according to claim 4, wherein the coloration portion is provided in the light reflection portion and is disposed so as to surround the light transmission portion. The reflection plate includes at least a reflection bottom portion arranged in the light source arrangement region, and a reflection side portion arranged in the light source non-arrangement region and rising toward the wavelength conversion sheet while being inclined from the reflection bottom portion to the outer end side. And at least
The lighting device according to any one of claims 2 to 5, wherein the coloring portion is provided at least on the reflection side portion.   The lighting device according to claim 6, wherein the coloring portion is arranged such that the area ratio increases as the distance from the light source increases. An optical member arranged in a form overlapping the reflector side with respect to the wavelength conversion sheet;
The lighting device according to claim 1, wherein the color forming portion is provided in the optical member.   The lighting device according to claim 1, wherein the coloration portion is provided on the wavelength conversion sheet. The reflecting plate has a light reflecting portion that reflects light and a light transmitting portion that transmits light,
The light reflecting portion is provided such that the area ratio of the light source arrangement region is higher than that of the light source non-arrangement region, and the light transmission portion has an area of the light source non-arrangement region than that of the light source arrangement region. The lighting device according to any one of claims 1 to 9, wherein the lighting device is provided so as to have a high ratio.   The reflective plate includes a reflective substrate that reflects light, and a light transmitting portion that transmits light is formed by partially opening the reflective substrate. The illuminating device according to any one of claims 1 to 10, wherein a portion where the light transmitting portion is not formed constitutes a light reflecting portion that reflects light.   The reflection plate has a transmission substrate that transmits light, and a light reflection portion that partially reflects light is formed on a plate surface of the transmission substrate, whereas the light of the transmission substrate is the light. The illuminating device according to any one of claims 1 to 10, wherein a portion where the reflecting portion is not formed constitutes a light transmitting portion that transmits light.   The light source emits magenta light including blue light and red light, and the wavelength conversion sheet includes a green phosphor that converts the wavelength of the blue light into green light as the phosphor. The illumination device according to any one of the above. The lighting device according to any one of claims 1 to 13,
A display panel that displays an image using light emitted from the illumination device.   A television receiver comprising the display device according to claim 14.

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