JP6889015B2 - Lighting device, display device and TV receiver - Google Patents

Description

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

As an example of the conventional liquid crystal display device, the one described in Patent Document 1 can be mentioned. This liquid crystal display device includes a liquid crystal panel and a so-called direct type backlight device (lighting device). This backlight device has a configuration in which a plurality of light sources are arranged in a matrix directly under the liquid crystal panel, and supplies white light that spreads in a plane toward the back surface of the liquid crystal panel.

The backlight device is arranged with a light source that emits blue light or the like as primary light and a state that is separated from the light source, and emits other light (secondary light) by wavelength-converting a part of the primary light. It is equipped with a wavelength conversion sheet. In the backlight device, white light is generated by additively mixing the primary light emitted from the light source and other light (secondary light) whose wavelength has been converted by the wavelength conversion sheet.

In addition to the wavelength conversion sheet, the backlight device includes various optical members arranged apart from the light source. Further, in the backlight device, a reflective sheet for reflecting light or the like reflected by an optical member or the like and returned to the light source side is provided.

International Publication No. 2016/136787

The light returned to the reflective sheet side (return light) also includes light that has already been wavelength-converted by the wavelength conversion sheet (secondary light). Therefore, if there is a portion of the backlight device in which the amount of primary light emitted from the light source is small, the ratio of the secondary light to the primary light increases at that location due to the influence of the return light. As a result, light tinged with the color of the secondary light is emitted from that location.

For example, in the backlight device, when local dimming is performed in which only a specific light source is lit out of a plurality of light sources in order to emit light only from a specific area, the peripheral portion of the area where the light source is lit is used. Since the amount of the primary light is reduced and the ratio of the secondary light to the primary light is increased, the light tinged with the color of the secondary light is emitted as described above.

Further, in the backlight device, when the distance between adjacent light sources is set to be long, the amount of primary light in the central portion thereof is smaller than that in the vicinity of the light source, and even in such a place, the primary light is primary. The ratio of secondary light to light increases. As a result, light tinged with the color of the secondary light is emitted from that location as well.

An object of the present invention is to provide a lighting device or the like in which the occurrence of color unevenness is suppressed.

The lighting device according to the present invention has a plurality of light sources, each of which has a light emitting surface that emits light, and a bottom portion that is arranged on the opposite side of the light emitting surface, and the plurality of the light sources are housed in a state of being spaced from each other. A wavelength conversion sheet containing a phosphor that is arranged in a state of being separated from the light source while facing the light emitting surface and that converts the light emitted from the light emitting surface, and emitted from the light emitting surface. A reflective sheet that reflects the light to the wavelength conversion sheet side and has a bottom-side reflecting portion that covers the bottom while exposing a plurality of the light sources, and each of the light emitted from the light emitting surface. It is provided with a plurality of dot-shaped coloring portions having the same color or the same color as each primary color light constituting the light and arranged on the surface of the bottom reflecting portion.

In the lighting device, it is preferable that the color-developing portion has a light absorption rate having a complementary color relationship with the color of the light emitted from the light emitting surface, which is higher than the absorption rate of the light emitted from the light emitting surface. ..

In the lighting device, it is preferable that the reflectance of the light emitted from the light emitting surface of the coloring portion is higher than the reflectance of the light having a complementary color relationship with the light emitted from the light emitting surface.

In the lighting device, it is preferable that the color-developing portion has a uniform density or color density per unit area.

In the lighting device, the color-developing portion has a higher density or color density per unit area between adjacent light sources on the central side between the light sources than near the light sources. Is preferable.

In the lighting device, the color-developing portion is arranged in the bottom-side reflective portion of the reflective sheet at a location where more light wavelength-converted by the phosphor is supplied than light emitted from the light source. Is preferable.

In the lighting device, the light source emits magenta color light including blue light and red light from the light emitting surface, and the wavelength conversion sheet is a green phosphor that converts the blue light into green light as the phosphor. The color-developing portion may be composed of a magenta-colored portion exhibiting a magenta color.

In the lighting device, the light source emits magenta color light including blue light and red light from the light emitting surface, and the wavelength conversion sheet is a green phosphor that converts the blue light into green light as the phosphor. The colored portion may be composed of a blue colored portion exhibiting blue and a red colored portion exhibiting red.

In the lighting device, the wavelength conversion sheet may include a sulfurized phosphor as the phosphor.

In the lighting device, the color-developing portion preferably comprises a coating film.

In the lighting device, by turning on only a part of the light sources and turning off the remaining light sources among the plurality of light sources, light is emitted only from a specific region in which the turned on light sources are arranged. Means may be provided.

In the lighting device, it is preferable that the color-developing portion is arranged on the peripheral edge of a specific region where the lit light source is arranged.

Further, the display device according to the present invention includes the lighting device according to any one of the above and a display panel for displaying an image by using the light emitted from the lighting device.

Further, the television receiving device according to the present invention includes the display device.

According to the present invention, it is possible to provide a lighting device or the like in which the occurrence of color unevenness is suppressed.

An exploded perspective view showing a schematic configuration of the television receiving device according to the first embodiment of the present invention. FIG. 1 is a cross-sectional view taken along the line AA of the liquid crystal display device shown in FIG. Top view of the lighting device included in the liquid crystal display device An enlarged cross-sectional view of the liquid crystal display device shown in FIG. An enlarged plan view of a part of the reflective sheet on which the color-developing portion included in the lighting device of the second embodiment is formed. An enlarged plan view of a part of the reflective sheet on which the color-developing portion included in the lighting device of the third embodiment is formed. Enlarged sectional view of a part of the lighting device of the fourth embodiment

<Embodiment 1>
Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 4. In this embodiment, a television receiving device 10TV (liquid crystal display device 10) including a lighting device (backlight device) 12 is illustrated. In each drawing, the X-axis, the Y-axis, and the Z-axis are shown for convenience of explanation.

As shown in FIG. 1, the television receiving device 10TV mainly accommodates a liquid crystal display device (an example of a display device) 10 and the liquid crystal display device 10 so as to be sandwiched from both front and rear (front and back) sides, both front and back cabinets 10Ca, 10Cb. A power supply 10P, a tuner (reception unit) 10T for receiving a television signal, and a stand 10S are provided. The liquid crystal display device 10 has a horizontally long rectangular shape that extends in the left-right direction (X-axis direction) as a whole. As shown in FIG. 2, the liquid crystal display device 10 mainly includes a liquid crystal panel 11 used as a display panel and a lighting device (backlight device) 12 as an external light source that supplies light to the liquid crystal panel 11. , A frame-shaped bezel 13 and the like for holding the liquid crystal panel 11 and the lighting device 12 and the like.

The liquid crystal panel 11 mainly includes a pair of transparent substrates and a liquid crystal layer that is sandwiched between them and is sealed, and the panel 11 uses the light emitted from the lighting device 12. Display the image on the surface in a visible state. In FIG. 2, the display surface 11a on the front side of the liquid crystal panel 11 is shown on the upper side, and the back surface 11b on the back side is shown on the lower side. The liquid crystal panel 11 has a horizontally long rectangular shape as a whole in a plan view. Of the pair of substrates constituting the liquid crystal panel 11, one substrate is an array substrate, and TFTs (Thin Film Transistors), pixel electrodes, and the like, which are switching elements, are arranged in a matrix on a transparent glass substrate. Consists of what has been done. An alignment film or the like is further formed on the inner surface (the surface on the liquid crystal layer side) of the TFT substrate. The other substrate is a color filter (hereinafter referred to as CF) substrate, which is a transparent glass substrate in which color filters composed of red, green, and blue colors are arranged in a matrix. Inside the CF substrate (on the liquid crystal layer side), a black matrix for partitioning the color filters in a grid pattern, a frame-shaped light-shielding portion 11c arranged along the peripheral edge of the liquid crystal panel 11, an alignment film, and the like are formed. Has been done. Further, a polarizing plate is arranged on each outside of the TFT substrate and the CF substrate.

Of the display surface 11a of the liquid crystal panel 11, the portion inside the frame-shaped light-shielding portion 11c is the display area AA on which the image is displayed. The frame-shaped area outside the display area AA is a non-display area NAA in which no image is displayed. The display area AA has a horizontally long rectangular shape in a plan view. The light-shielding portion 11c has a frame shape that surrounds the display area AA in a plan view.

The lighting device 12 is arranged on the back side of the liquid crystal panel 11 and supplies light toward the liquid crystal panel 11. The lighting device 12 is configured to emit white light. The lighting device 12 of the present embodiment is a so-called direct type. As shown in FIG. 2, the lighting device 12 mainly includes a chassis 14, an optical member 15, a frame 16, an LED substrate (light source substrate) 18 on which an LED (light source) 17 is mounted, and a coloring portion (magenta color coloring). A reflection sheet 19 provided with a portion (30), a wavelength conversion sheet 21, and the like are provided.

The chassis 14 has a shallow bottom substantially box shape opened on the front side (light emitting side, liquid crystal panel 11 side) as a whole, and is composed of, for example, a metal plate such as an aluminum plate or an electrogalvanized steel plate (SECC). Will be done. The opening of the chassis 14 is a light emitting portion 14b. Further, like the liquid crystal panel 11, the chassis 14 has a plate-shaped bottom portion 14a having a substantially rectangular shape in a plan view, and the chassis 14 is inclined outward from the four sides (periphery) of the bottom portion 14a to the front side (light emitting side). It includes a plate-shaped side wall portion 14c that rises toward the side, a plate-shaped receiving portion 14d that projects outward from the rising end of each side wall portion 14c, and a standing wall portion 14e that rises from each receiving portion 14d to the front side. The light emitting portion 14b is composed of an inner portion surrounded by a standing wall portion 14e. Inside the chassis 14, various members such as an LED substrate 18 on which the LED 17 is mounted, a reflective sheet 19, an optical member 15, and a wavelength conversion sheet 21 are housed. In such a chassis 14, the LED substrate 18 is housed so that the back surface side faces the bottom portion 14a. That is, the bottom portion 14a is arranged on the side opposite to the light emitting surface 17a side of the LED 17. The receiving portion 14d of the chassis 14 has a frame shape as a whole, and the optical member 15 and the wavelength conversion sheet 21 are placed on the receiving portion 14d from the front side. The standing wall portion 14e has a frame shape (cylindrical shape) rising from the outer peripheral edge of the receiving portion 14d as a whole, and surrounds the optical member 15 and the wavelength conversion sheet 21 mounted on the receiving portion 14d. .. Further, a frame-shaped frame 16 is assembled to the vertical wall portion 14e. Boards such as a control board and an LED drive board (an example of control means) 50 are attached to the outside of the chassis 14. Further, in each drawing, the chassis 14 is shown so that the long side direction coincides with the X-axis direction and the short side direction coincides with the Y-axis direction.

Like the liquid crystal panel 11, the optical member 15 has a substantially rectangular shape in a plan view, and is set larger than the display area AA of the liquid crystal panel 11. Further, the outer edge portion of the optical member 15 is placed on a receiving portion 14d or the like of the chassis 14 to cover the light emitting portion 14b of the chassis 14, and is arranged between the liquid crystal panel 11 and the LED 17. Such an optical member 15 faces the light emitting surface 17a in a state of being separated from the LED 17. The optical member 15 is arranged on the back side (LED17 side) and placed on the diffuser plate 15a mounted on the receiving portion 14d of the chassis 14, and on the frame 16 arranged on the front side (liquid crystal panel 11 side) and fixed to the receiving portion 14d. It is roughly classified into an optical sheet 15b on which it is mounted. The diffusion plate 15a has a structure in which a large number of diffusion particles are dispersed in a plate material made of a substantially transparent resin having a predetermined thickness. The diffusion plate 15a of the present embodiment includes a first diffusion plate 15a1 arranged on the back side and a second diffusion plate 15a2 arranged on the front side. On the surface of the first diffuser plate 15a1, a plurality of lenticular lenses extending along the long side direction (X-axis direction) and lined up in the short side direction (Y-axis direction) are formed, and on the surface of the second diffuser plate 15a2. Is formed with a plurality of lenticular lenses arranged in the long side direction (X-axis direction) while extending along the short side direction (Y-axis direction). The first diffuser plate 15a1 and the second diffuser plate 15a2 are overlapped so that the lenticular lenses intersect with each other. As will be described later, the wavelength conversion sheet 21 is laminated on the front side of the diffusion plate 15a.

The optical sheet 15b has a sheet shape having a smaller thickness than the diffusion plate 15a, and is composed of two sheets. Specifically, it is composed of a lens sheet (prem sheet) 22 and a reflective polarizing sheet 23 stacked on the front side of the lens sheet 22.

The lens sheet 22 includes a sheet-shaped 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 arranged in the short side direction (Y-axis direction) while extending along the long side direction (X-axis direction). By providing such a prism portion, the lens sheet 22 selectively collects light from the diffuser plate 15a side (wavelength conversion sheet 21 side) in the arrangement direction (Y-axis direction) of the unit prisms (different). (Direct light condensing action) can be imparted.

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 laminated, and among the light from the lens sheet 22, the p wave is transmitted and the s wave is reflected to the back side. The s wave reflected by the reflective polarizing film is reflected to the front side again by a reflective sheet 19 or the like described later, and at that time, it is separated into an s wave and a p wave. In this way, the reflective polarizing sheet 23 is provided with the reflective polarizing film, so that the s wave originally absorbed by the polarizing plate of the liquid crystal panel 11 is reflected to the back side (reflection sheet 19 side). It can be effectively used and the light utilization efficiency (brightness) can be improved. The pair of diffusing films are made of a transparent synthetic resin material such as a polycarbonate resin, and the surface opposite to the reflective polarizing film side is embossed to impart a diffusing effect to light.

The frame (frame-shaped member) 16 is a frame-shaped member having an open inside that covers the front side of the chassis 14. The frame 16 is made of, for example, a synthetic resin and is painted white so as to have light reflectivity. The frame 16 has a frame shape in a plan view, and the inner peripheral edge side covers the peripheral end portion of the wavelength conversion sheet 21 housed in the chassis 14 from the front side, and the covering portion 16a to the chassis 14. An outer wall portion 16b attached to the vertical wall portion 14e of the chassis 14 from the outside is provided while extending toward the bottom portion 14a side of the chassis 14.

The covering portion 16a of the frame 16 sandwiches the peripheral end portion of the laminate composed of the diffusion plate 15a and the wavelength conversion sheet 21 housed in the chassis 14 with the receiving portion 14d. The covering portion 16a is in contact with the peripheral end portion of the wavelength conversion sheet 21 mounted on the diffusion plate 15a from the front side. Further, the covering portion 16a of the frame 16 is configured to receive the optical sheet 15b and the liquid crystal panel 11 from the back side. Further, the covering portion 16a is configured to receive the peripheral end portion of the optical sheet 15b on the front side. The liquid crystal panel 11 is placed on the covering portion 16a of the frame 16 in a state of being overlapped on the front side of the optical sheet 15b. The laminate composed of the optical sheet 15b and the liquid crystal panel 11 is positioned by sandwiching the peripheral end portion between the covering portion 16a of the frame 16 and the bezel 13 arranged on the front side.

Although most of the covering portion 16a of the frame 16 is arranged in the non-display region NAA of the liquid crystal panel 11, the end portion of the covering portion 16a on the inner peripheral edge side enters the display region AA of the liquid crystal panel 11. That is, the covering portion 16a is arranged from the non-display region NAA to the display region AA. The covering portion 16a protrudes toward the display area AA from the receiving portion 14d of the chassis 14.

The LED 17 is surface-mounted on the LED substrate 18 so that the light emitting surface 17a faces the liquid crystal panel 11 side (optical member 15 side). The LED 17 is a so-called top surface light emitting type in which the light emitting surface 17a faces the side opposite to the LED substrate 18 side. The optical axis of the light emitted from the light emitting surface 17a of the LED 17 coincides with the normal direction of the display surface of the liquid crystal panel 11. The "optical axis" here is an axis that coincides with the direction of the light having the highest emission intensity among the light emitted from the light emitting surface 17a of the LED 17.

The LED 17 emits magenta light (magenta light) as primary light from the light emitting surface 17a. The LED 17 has a blue LED chip (blue light emitting element) that emits blue light (wavelength region of about 420 nm to about 500 nm) as a light emitting source. The LED 17 comprises a blue LED chip sealed in a predetermined case with a sealing material containing a red phosphor. The blue LED chip is made of a semiconductor material such as InGaN, and emits blue light when a voltage is applied in the forward direction. The blue LED chip is connected to the wiring pattern of the LED substrate 18 arranged outside the case by a lead frame (not shown). The encapsulant is made of a transparent resin in which a red phosphor is dispersed. A part of the light emitted from the blue LED chip is absorbed by the red phosphor in the encapsulant and wavelength-converted to red light. That is, the red phosphor absorbs and excites the light (blue light) from the blue LED chip and emits the red light (wavelength region of about 600 nm to about 780 nm). As a result, the light emitting surface 17a of the LED 17 emits magenta light (magenta light) in which the blue light from the blue LED chip and the red light of the red phosphor are additively mixed. In this embodiment, a plurality of LEDs 17 are used.

The LED substrate 18 has a rectangular shape in a plan view, and a plurality of LED substrates 18 are used in this embodiment. The plurality of LED substrates 18 are arranged on the bottom portion 14a of the chassis 14 in an aligned state while aligning the directions of the respective sides with each other. Each LED substrate 18 is arranged so that its sides coincide with each other in the X-axis direction and the Y-axis direction. The LED substrate 18 is made of, for example, a board made of an aluminum-based material in which a wiring pattern made of a metal film such as copper foil is formed via an insulating layer on the surface of the plate material. A white reflective layer may be formed on the outermost surface of the LED substrate 18. The plurality of LEDs 17 described above are surface-mounted on the front plate surface of the LED substrate 18. The plate surface on the front side of the LED substrate 18 is referred to as a mounting surface 18a. Each LED 17 is electrically connected to a wiring pattern formed in the mounting surface 18a.

On one LED substrate 18, a plurality of LEDs 17 are arranged in a matrix while maintaining a distance from each other. Further, all the LEDs 17 are arranged in a matrix as a whole on the bottom portion 14a of the chassis 14 while maintaining a distance from each other. That is, the plurality of LEDs 17 are arranged on the bottom portion 14a side of the chassis 14 in a planarly spread state. The distance between adjacent LEDs 17 is set to be the same. All the LEDs 17 are arranged so as to fit within the display area AA of the liquid crystal panel 11 in a plan view. The LEDs 17 are arranged so as to be arranged at equal intervals along the long side direction (X-axis direction) and the short-side direction (Y-axis direction) of the liquid crystal panel 11. Further, the distance (interval) between the adjacent LED substrates 18 is set to be constant.

Each LED board 18 is provided with a connector portion to which a wiring member (not shown) is connected, and drive power is supplied from the LED drive board 50 via the wiring member. It is also possible that each LED 17 on each LED substrate 18 is controlled by the LED drive substrate to perform partial drive (local dimming).

The reflective sheet (reflective member) 19 is made of a white sheet having excellent light reflectivity, and is made of, for example, a white foamable plastic sheet (foamable polyethylene terephthalate sheet). The reflective sheet 19 is assembled in a shallow-bottomed box shape that opens to the front side as a whole, and is housed in the chassis 14 so as to cover substantially the entire inner surface of the chassis 14. The reflective sheet 19 is set to be larger than the display area AA of the liquid crystal panel 11 in a plan view. The light reflectance of the surface of the reflective sheet 19 itself is substantially constant, and such a reflective sheet 19 reflects (diffusely reflects) all visible light. As will be described later, a plurality of color-developing portions 20 are formed on the surface of the reflective sheet 19.

The reflective sheet 19 reflects the light in the chassis 14 toward the front side (optical member 15 side). The reflective sheet 19 has a rectangular bottom-side reflective portion 19a that covers the bottom portion 14a of the chassis 14, and a liquid crystal panel 11 side (wavelength conversion) while being inclined outward from each side edge corresponding to the four sides of the bottom-side reflective portion 19a. It is provided with four inclined reflecting portions 19b that rise toward the seat 21 side) and an extending portion 19c that extends outward from the inclined reflecting portion 19b and covers the receiving portion 14d of the chassis 14. The bottom-side reflecting portion 19a is a portion that completely covers the surface (mounting surface) 18a of all the LED substrates 18 arranged on the bottom portion 14a. The bottom-side reflecting portion 19a is provided with a plurality of opening-shaped insertion portions 19d, and each LED 17 on the LED substrate 18 is inserted into each insertion portion 19d one by one, and each of the insertion portions 19d is inserted. The LED 17 is exposed.

The inclined reflecting portion 19b is formed from a pair of short side inclined reflecting portions 19b1 and 19b2 rising from the two short side side edges of the bottom reflecting portion 19a and two long side side edges of the bottom reflecting portion 19a. It is composed of a pair of rising long-side inclined reflecting portions 19b3 and 19b4 (see FIG. 3). The extension portion 19c has a strip shape that is elongated along the short side direction and the long side direction of the chassis 14. The bottom-side reflecting portion 19a and the inclined reflecting portion 19b are set to a size that fits within the display area AA of the liquid crystal panel 11 in a plan view.

The extending portion 19c has a frame shape that surrounds the bottom reflecting portion 19a and the inclined reflecting portion 19b as a whole. The extension portions 19c extend to the tips of a pair of short side extension portions 19c1, 19c2 extending to the tips of the short side inclined reflection portions 19b1, 19b2 and the tips of the long side inclined reflection portions 19b3, 19b4. It is composed of a pair of long side extending portions 19c3 and 19c4 to be provided.

The extending portion 19c overlaps the peripheral end portion of the optical member 15 (diffusion plate 15a, optical sheet 15b) arranged on the front side and the peripheral end portion of the wavelength conversion sheet 21 in the front-back direction (Z-axis direction). As described above, it is mounted on the receiving portion 14d of the chassis 14. In addition, although most of the extended portion 19c overlaps the non-display area of the liquid crystal panel 11 in a plan view, a part of the extension portion 19c overlaps the non-display area NAA. That is, the extension portion 19c is formed from the non-display area NAA to the display area AA. The covering portion 16a of the frame 16 has a shape protruding inward (display region AA side) from the extending portion 19c. The extending portion 19c is completely covered with the covering portion 16a in a plan view.

In the chassis 14, the area where the LED 17 is arranged is substantially the same as the area where the bottom reflecting portion 19a of the reflective sheet 19 is arranged. The LED 17 is not arranged in the area where the inclined reflection portion 19b and the extension portion 19c of the reflection sheet 19 are arranged. As will be described later, a color-developing portion 30 and the like are formed on the surface of the reflective sheet 19.

The wavelength conversion sheet 21 includes a phosphor layer containing a phosphor for wavelength conversion of light from the LED 17, and a pair of transparent base material layers that sandwich the phosphor layer from the front and back. The phosphor layer is composed of a large number of phosphors dispersed in a resin. As the phosphor in the phosphor layer, a green phosphor that is excited by blue light (monochromatic light) emitted from the LED 17 and emits green light (wavelength region of about 500 nm to about 570 nm) is used. As such a green phosphor, one having a relatively sharp emission spectrum is preferable, and for example, a sulfide phosphor such as _{"SrGa 2} S ₄ : Eu ^{2+" is used.}

Like the liquid crystal panel 11, the wavelength conversion sheet 21 has a rectangular shape in a plan view, and has a size substantially equal to that of the diffusion plate 15a of the optical member 15. That is, the wavelength conversion sheet 21 is set to be larger than the display area AA of the liquid crystal panel 11. The wavelength conversion sheet 21 is in the form of a sheet having a thickness smaller than that of the diffuser plate 15a, and is placed on the diffuser plate 15a in the chassis 14. Specifically, among the two-layered diffusion plates 15a, they are arranged so as to cover the surface of the second diffusion plate 15a2 arranged on the front side. The peripheral end of the wavelength conversion sheet 21 is mounted on the front side of the diffuser plate 15a (second diffuser plate 15a2) in the front-back direction (Z-axis direction), and is placed on the receiving portion 14d and the receiving portion 14d of the chassis 14. It faces the extending portion 19c of the reflective sheet 19 mounted on the vehicle so as to overlap with the extending portion 19c. Further, the peripheral end portion of the wavelength conversion sheet 21 is sandwiched between the covering portion 16a of the frame 16 and the receiving portion 14d of the chassis 14 together with the peripheral end portion of the diffuser plate 15a in a state of being mounted on the diffuser plate 15a. Will be done.

On the surface of the bottom-side reflective portion 19a of the reflective sheet 19, a plurality of colored portions (magenta colored portions) 30 having the same color (magenta color) as the light emitted from the light emitting surface 17a of the LED 17 are provided. The color-developing portions 30 are uniformly dispersed in a matrix on the surface of the bottom-side reflecting portion 19a. Each of the coloring portions 30 has a circular shape in a plan view, and is formed so as to be scattered over substantially the entire area of the bottom reflecting portion 19a. The white bottom-side reflecting portion 19a is exposed between the adjacent color-developing portions 30. A space larger than the size of one color-developing portion 30 is provided between the adjacent color-developing portions 30.

The color-developing portion 30 is made of a coating film containing a pigment exhibiting a magenta color. Such a coating film comprises a coating film containing the pigment formed by using a known coating technique (for example, printing technique). The coating film is appropriately dried, if necessary. In the coloring unit 30, the absorption rate of the light (green light) having a complementary color relationship with the color of the light (magenta color light) emitted from the light emitting surface 17a is the light (magenta color light) emitted from the light emitting surface 17a. It is higher than the absorption rate of blue light and red light)). Further, in the coloring unit 30, the reflectance of the light (magenta color light (blue light, red light)) emitted from the light emitting surface 17a is a color light having a complementary color relationship with the light emitted from the light emitting surface 17a (the color light (blue light, red light)). It is higher than the reflectance of green light). That is, the coloring unit 30 has a function of absorbing green light and reflecting magenta light (blue light, red light). As a result, the light reflected by the color-developing portion 30 (for example, white return light) is compared with the case where the light is reflected by the white portion (bottom-side reflecting portion 19a, etc.) in which the color-developing portion 30 is not provided. , Will be magenta.

The size of each color-forming portion 30 is substantially the same, and the density (color density) is also substantially the same. The color-developing portion 30 arranged on the outermost side of the bottom-side reflecting portion 19a is smaller in size than the color-developing portion 30 arranged on the inner side for convenience of manufacturing equipment. The color-developing portion 30 is set so that the density per unit area becomes uniform on the surface of the bottom-side reflecting portion 19a. Further, the color-developing portion 30 is set so that the density (color density) per unit area becomes uniform on the surface of the bottom-side reflecting portion 19a. Since the light (primary light) from the LED 17 is sufficiently supplied to the bottom reflecting portion 19a side as compared with the inclined reflecting portion 19b side, the coloring portion 30 has a higher density per unit area. It is set smaller than the coloring unit 20 described later.

In the lighting device 12, the primary light (magenta colored light) emitted from the LED 17 is less likely to be supplied to the inclined reflecting portion 19b than the bottom reflecting portion 19a, and the distribution of the amount of light related to the primary light (magenta colored light) from the LED 17 However, it tends to be high on the center side (bottom reflection portion 19a side) of the display surface 11a (display area AA) and low on the peripheral side (tilt reflection portion 19b side) of the display surface 11a (display area AA). There is. In particular, at the peripheral edge of the display surface 11a (display area AA), the amount of light tends to decrease toward the outside.

Further, in the inclined reflection unit 19b, the ratio of the light (return light) that has already been wavelength-converted by the wavelength conversion sheet 21 and is returned to the reflection sheet 19 side after being reflected by the optical sheet 15b becomes high. easy. The distance between the inclined reflecting portion 19b and the optical member 15 gradually decreases from the inside (bottom side reflecting portion 19a side) to the outside (extended portion 19c), and the reflected light by the inclined reflecting portion 19b is inclined. As it goes to the outside of the reflecting portion 19b, it becomes easier to make multiple reflections with the optical member 15. Therefore, the wavelength conversion efficiency of the wavelength conversion sheet 21 tends to be relatively high toward the outside of the inclined reflection portion 19b.

When the amount of light (primary light) supplied to the wavelength conversion sheet 21 is biased in the lighting device 12, the primary light (magenta color light) finally emitted from the lighting device 12 and the wavelength conversion sheet 21 The ratio of the wavelength-converted light (secondary light) is different between the central side of the display area AA and the peripheral side of the display area AA. In that case, color unevenness occurs in the light emitted from the lighting device 12 and the display image of the liquid crystal panel 11. Specifically, on the peripheral side of the display area AA, the amount of primary light from the LED 17 is relatively small, and that portion is tinged with green, which has a complementary color relationship with the color of the primary light (magenta color). Become.

Therefore, in order to suppress the occurrence of such color unevenness, the same color as the light emitted from the light emitting surface 17a of the LED 17 (that is, that is, on the surface of the inclined reflection portion 19b of the reflection sheet 19 as in the coloration portion 30). , Magenta), and a plurality of dot-shaped coloring portions (magenta coloring portions) 20 are formed. As shown in FIG. 3, a plurality of dot-shaped coloring portions 20 are formed on the surfaces of the four inclined reflecting portions 19b arranged around the bottom reflecting portion 19a. Each color-developing portion 20 has a circular shape in a plan view, and is formed so as to be scattered over substantially the entire area of the inclined reflecting portion 19b. Each color-developing portion 20 is set so that its size increases from the bottom-side reflecting portion 19a side toward the outside (extended portion 19c).

Further, the extending portion 19c is also provided with a plurality of coloring portions 40 having the same color (magenta color) as the light emitted from the light emitting surface 17a of the LED 17, similar to the coloring portion 30 of the inclined reflecting portion 19b described above. .. The coloring portions 40 are arranged on the surface of the extending portion 19c in a frame shape surrounding the bottom side reflecting portion 19a and the inclined reflecting portion 19b while being evenly arranged. The size of each color-forming portion 40 is substantially the same. The coloring portion 40 of the extending portion 19c and the coloring portion 20 of the inclined reflecting portion 19b absorb green light and magenta color light (blue light, red light) like the coloring portion 30 of the bottom reflecting portion 19a. ) Is reflected.

When the power of the liquid crystal display device 10 provided with the lighting device 12 as described above is turned on, various signals output from a control board (not shown) are transmitted to the liquid crystal panel 11, and the display of the liquid crystal panel 11 is controlled. The LED drive board 50 controls the lighting drive of the LED 17 on the LED board 18. The light emitted from the light emitting surface 17a of the LED 17 is finally directed toward the liquid crystal panel 11 side after being subjected to a predetermined optical action by the optical member 15 and the wavelength conversion sheet 21. By using such light, a visible image is displayed in the display area AA of the liquid crystal panel 11.

Here, the optical action of the optical member 15 and the wavelength conversion sheet 21 in the lighting device 12 will be described in detail. Magenta-colored light composed of blue light and red light is emitted as primary light from the light emitting surface 17a of the LED 17. The primary light from the LED 17 is imparted with a diffusing action by the diffusing plate 15a (first diffusing plate 15a1, second diffusing plate 15a2), and then a part of the primary light is incident on the wavelength conversion sheet 21 on the diffusing plate 15a. 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. In this way, white light is formed by emitting primary light (blue light, red light) from the LED 17 and secondary light (green light) obtained after wavelength conversion from the wavelength conversion sheet 21. Will be done.

The primary light (blue light, red light) and the secondary light (green light) emitted from the wavelength conversion sheet 21 are incident on the lens sheet 22 to impart a condensing effect, and then are reflected polarized light. In the sheet 23, a specific polarized light (p wave) is selectively transmitted toward the liquid crystal panel 11, and a specific polarized light (s wave) different from the specific polarized light (s wave) is selectively reflected to the back side. The s-wave light reflected by the reflective polarizing sheet 23, the light reflected toward the back side by the lens sheet 22 without being imparted with a condensing action, and the light reflected toward the back side by the diffuser plate 15a, etc. Is reflected by the reflective sheet 19 and proceeds toward the front side again.

Next, the optical action of the reflective sheet 19 and the color-developing portion 30 and the like will be described in detail. The reflective sheet 19 includes primary light (magenta light composed of blue light and red light) from the LED 17 that does not directly face the optical member 15 side, and light returned to the back side by the optical member 15 or the like (primary light and secondary light). ) Is reflected toward the front side.

In the lighting device 12 of the present embodiment, each LED 17 can be partially driven (local dimming). In the present embodiment, lighting drive and extinguishing drive can be performed for each LED group composed of a plurality of LEDs 17 mounted on one LED substrate 18. FIG. 3 shows a lighting area S1 and a light-off area S2 of the LED 17 in the lighting device 12. As shown in FIG. 3, a total of eight LED substrates 18 are arranged in the lighting device 12 so as to be arranged in two in the vertical direction (Y-axis direction) and four in the horizontal direction (X-axis direction). ing. A total of 20 LEDs 17 are mounted on one LED substrate 18 in a form in which five LEDs 17 are arranged in the vertical direction (Y-axis direction) and four LEDs 17 are arranged in the horizontal direction (X-axis direction). In FIG. 3, of the eight LED boards 18, the LED groups on the two LED boards 18 arranged on the left side are lit and driven, and the LED groups on the remaining six LED boards 18 arranged on the right side are lit. The state of being driven off is shown. In FIG. 3, the area in which the LED group to be driven to turn on is arranged (a specific area in which the lit light source is arranged, the lighting area) is indicated by reference numeral S1, and the area in which the LED group to be turned off is arranged (light-off area). Is indicated by the reference numeral S2.

In the lighting area S1, the amount of light (primary light) supplied from the LED 17 tends to be large on the central side and small on the peripheral side. For example, in the peripheral portion R of the lighting region S1 in contact with the extinguishing region S2, the amount of light (primary light) supplied from the LED 17 is smaller than that on the central side. Therefore, in such a place, the ratio of the secondary light to the primary light tends to be high. In the lighting device 12 of the present embodiment, as described above, the coloring portions 30 are uniformly distributed and arranged on the surface of the bottom reflecting portion 19a. Therefore, in such a peripheral portion R and its vicinity, the coloring portions 30 are uniformly distributed. Since the magenta coloring portion 30 is arranged, the primary light (magenta color light (blue light, red light)) contained in the return light is reflected by the coloring portion 30 and is included in the return light. The light (green light) is absorbed by the coloring unit 30. As a result, it is suppressed that the ratio of the secondary light to the primary light is increased in the peripheral portion R, and the color of the light emitted from the central side of the lighting region S1 and the color of the light emitted from the peripheral portion R are suppressed. Difference is suppressed. In this way, it is possible to suppress the occurrence of color unevenness in the light emitted from the lighting region S1. The color-developing portion 30 supplies more light wavelength-converted by the wavelength conversion sheet 21 (fluorescent material) than light emitted from the LED (light source) 17 in the bottom-side reflecting portion 19a of the reflective sheet 19. It can be said that they are arranged in places.

In such a lighting device 12, the amount of primary light supplied to the wavelength conversion sheet 21 in the portion corresponding to the lighting region S1 is homogenized, and as a result, the color of the emitted light emitted from the lighting device 12 is changed. It is homogenized and color unevenness is suppressed.

Further, in the reflective sheet 19, the inclined reflecting portion 19b is formed with a coloring portion 20 so that the density per unit area is higher than that of the bottom reflecting portion 19a. Therefore, even if the amount of primary light supplied to the inclined reflecting portion 19b side is smaller than the amount of primary light supplied to the bottom reflecting portion 19a side, there are many coloring portions 20 on the inclined reflecting portion 19b side. Since the primary light (magenta color light) is reflected, it is suppressed that a color difference occurs between the reflected light on the inclined reflecting portion 19b side and the reflected light on the bottom reflecting portion 19a side. Further, multiple reflections occur between the inclined reflecting portion 19b and the optical member 15, and the wavelength conversion efficiency of the light by the wavelength conversion sheet 21 is locally increased, and the secondary light (green light) is on the inclined reflecting portion 19b side. On the inclined reflecting portion 19b side, the coloring portion 20 absorbs a large amount of secondary light (green light), so that the reflected light on the inclined reflecting portion 19b side and the bottom reflecting portion 19a side are supplied. It is suppressed that a color difference occurs between the light and the reflected light.

Since the coloring portion 30 and the like of the present embodiment are dot-shaped, the density of the coloring portion 30 can be easily increased in order to increase the reflection efficiency (and the absorption efficiency of the secondary light) of the light (primary light) from the LED 17. Can be changed step by step. Further, when the color-developing portion 30 has a dot shape, the amount of a material such as a paint forming the color-developing portion 30 can be suppressed. Further, when the coloring portion 30 has a dot shape, the inclined reflecting portion 19b is exposed between the adjacent coloring portions 23. Therefore, for example, when assembling the lighting device 12, the bottom side of the reflecting sheet 19 It is suppressed that the color-developing portion 30 in the reflecting portion 19a is unnecessarily adhered to another member.

<Embodiment 2>
Next, Embodiment 2 of the present invention will be described with reference to FIG. In this embodiment, instead of the magenta color-developing portion 30 of the first embodiment, a blue-colored portion (blue-colored portion) 30A1 and a red-colored portion (red-colored portion) 30A2 are provided as a reflective sheet. It is composed of the one formed on the bottom reflecting portion 19a of 19. The description of the same configuration as that of the first embodiment will be omitted (the same applies to the subsequent embodiments). FIG. 5 is an enlarged plan view of a part of the reflective sheet 19 on which the color-developing portions 30A1 and 30A2 included in the lighting device of the second embodiment are formed. FIG. 5 shows a part of the reflective sheet 19 developed in a plane. Unlike the first embodiment, the bottom-side reflective portion 19a of the reflective sheet 19 has a dot-like shape that exhibits the same color as each primary color light (that is, blue light and red light) constituting the light from the LED 17 (magenta color light). A blue coloring portion (blue coloring portion) 30A1 and a dot-shaped red coloring portion (red coloring portion) 30A2 are formed. As a whole, the color-developing portion 30A1 and the color-developing portion 30A2 are uniformly distributed in a matrix on the surface of the bottom-side reflecting portion 19a as in the first embodiment. The blue coloring portion 30A1 and the red coloring portion 30A2 are arranged so as to be alternately arranged in the vertical direction (Y-axis direction) and the horizontal direction (X-axis direction). The color-developing portions 30A1 and 30A2 have a circular shape in a plan view as in the first embodiment. As in the first embodiment, the magenta color-developing portion 20 is formed on the inclined reflection portion 19b.

In the present embodiment, among the primary lights included in the return light, the blue light is reflected by the blue coloring portion 30A1 and the red light is reflected by the red coloring portion 30A2. Further, the secondary light (green light) contained in the return light is absorbed by the blue coloring portion 30A1 and the red coloring portion 30A2. Therefore, in the present embodiment, as in the first embodiment, even when each LED 17 is partially driven (local dimming) to emit light only from a specific lighting region, the light is emitted from the peripheral portion of the lighting region with respect to the primary light. The increase in the ratio of the secondary light is suppressed, and the difference between the color of the light emitted from the central side of the lighting region and the color of the light emitted from the peripheral portion is suppressed. As a result, the amount of primary light supplied to the wavelength conversion sheet in the portion corresponding to the lighting region is homogenized, the color of the emitted light emitted from the lighting device 12 is homogenized, and color unevenness is suppressed. Will be done.

<Embodiment 3>
Next, Embodiment 3 of the present invention will be described with reference to FIG. In this embodiment, instead of the circular coloring portion 30 of the first embodiment, a square (square) -shaped (dot-shaped example) magenta coloring portion (magenta coloring portion) 30B is formed. Consists of. FIG. 6 is an enlarged plan view of a part of the reflective sheet 19 on which the color-developing portion 30B included in the lighting device of the third embodiment is formed. FIG. 6 shows a part of the reflective sheet 19 developed in a plane. As a whole, the color-developing portions 30B are uniformly distributed in a matrix on the surface of the bottom-side reflecting portion 19a as in the first embodiment. Similar to the color-developing portion 30B, the inclined reflection portion 19b is formed with a magenta-colored color-developing portion 20B having a rectangular shape in a plan view.

Even if the reflective sheet 19 provided with the square-shaped coloring portion 20B as in the present embodiment is used, as in the first embodiment, each LED 17 is partially driven (local dimming) to emit light only from a specific lighting area. Even when the light is emitted, the ratio of the secondary light to the primary light is suppressed to be high in the peripheral portion of the lighting region, and the color of the light emitted from the central side of the lighting region and the light emitted from the peripheral portion are emitted. The difference in light color is suppressed. As a result, the amount of primary light supplied to the wavelength conversion sheet in the portion corresponding to the lighting region is homogenized, the color of the emitted light emitted from the lighting device 12 is homogenized, and color unevenness is suppressed. Will be done.

<Embodiment 4>
Next, Embodiment 4 of the present invention will be described with reference to FIG. FIG. 7 is an enlarged cross-sectional view of a part of the lighting device 12C of the fourth embodiment. FIG. 7 shows a cross-sectional view of the LED substrate 18C and the reflective sheet 19C arranged on the bottom portion 14a of the chassis 14. The same LED 17 as in the first embodiment is mounted on each LED substrate 18C of the present embodiment. However, the distance between adjacent LEDs 17 is set to be longer than in the case of the first embodiment. A magenta color-developing portion 30C is also formed on the bottom-side reflective portion 19Ca of the reflective sheet 19 of the present embodiment. As a whole, the color-developing portions 30C are arranged substantially uniformly in a matrix on the surface of the bottom-side reflecting portion 19Ca as in the first embodiment. However, the color-developing portion 30C arranged between the adjacent LEDs 17 is set so that the density (or density) of the color-developing portion 30C is higher on the central side than near the LED 17. In FIG. 7, the color-developing portion 30C arranged on the center side of the adjacent LEDs 17 is referred to as the color-developing portion 30C1, and the color-developing portion 30C near the LED 17 is referred to as the color-coloring portion 30C2.

When the distance between adjacent LEDs 17 is set to be long as in the present embodiment, the amount of primary light in the central portion thereof is smaller than that in the vicinity of the LED 17, and even in such a place, the primary light is relative to the primary light. The proportion of secondary light tends to increase. Therefore, by arranging the color-developing portion 30C1 having a relatively high density or density in such a place, it is suppressed that the ratio of the secondary light to the primary light becomes high in that place, and the distance from the LED 17 is suppressed. The difference between the color of the light emitted from a distant place and the color of the light emitted from the vicinity of the LED 17 is suppressed. As a result, the amount of primary light supplied to the wavelength conversion sheet and the like are homogenized, the color of the emitted light emitted from the illuminating device 12C is homogenized, and color unevenness is suppressed.

<Other Embodiments>
The present invention is not limited to the embodiments described in the above description and drawings, and for example, the following embodiments are also included in the technical scope of the present invention.
(1) In the above embodiment, the color-developing portion includes a coating film, but the present invention is not limited to this, and for example, cellophane having the same color as the light emitted from the LED is used as the color-developing portion. May be good. However, as in the above embodiment, the color-developing portion made of a coating film can be formed by using an existing coating device (printing device or the like), and the forming speed is high, which is preferable.
(2) In the above embodiment, an LED (light source) that emits magenta color light (blue light, red light) is used, but the present invention is not limited to this. For example, wavelength conversion including a green phosphor that converts blue light into green light and a red phosphor that converts blue light into red light by using a light source that emits blue light as primary light. Sheets may be used. In this case, green light and red light are emitted from the wavelength conversion sheet as secondary light wavelength-converted by the phosphor, and a blue coloring portion (blue coloring) is emitted from the inclined reflecting portion of the reflection sheet. Part) is formed. Further, as the green phosphor, for example, SrGa ₂ S ₄ : Eu ²⁺ may be used, and as the red phosphor, for example, (Ca, Sr, Ba) S: Eu ²⁺ may be used.
(3) In another case, a light source that emits blue light as primary light may be used, and a wavelength conversion sheet containing a yellow phosphor that converts blue light into yellow light may be 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, and a blue color-developing portion (blue color-developing portion) is emitted from the inclined reflection portion of the reflection sheet. It is formed.
(4) In another case, a light source that emits purple light may be used, and a wavelength conversion sheet containing a yellow phosphor and a green phosphor may be used as the phosphor. In this case, a purple color-developing portion is used as the color-developing portion.
(5) In another case, a light source that emits cyan light may be used, and a wavelength conversion sheet containing a red phosphor may be used as the phosphor. In this case, a cyan color-developing portion is used as the color-developing portion.
(6) In the above embodiment, a sulfurized phosphor is used as the phosphor of the wavelength conversion sheet, but the present invention is not limited to this, and for example, a quantum dot phosphor (Quantum Dot Phosphor) may be used. Quantum dot phosphors have discrete energy levels by confining electrons / holes and excitons in nano-sized (for example, about 2 nm to 10 nm in diameter) semiconductor crystals in a three-dimensional spatial orientation. By changing the size of the dots, the peak wavelength (emission color) of the emitted light can be appropriately selected. In addition, since the quantum dot phosphor is liable to deteriorate by reacting with oxygen and moisture in the air and uses cadmium or the like which is an environmentally hazardous substance, the above-mentioned sulfide phosphor is used as the phosphor of the wavelength conversion sheet. Is preferable. The sulfide phosphor is coated with a silicon dioxide film, and by adding a gas absorber to the wavelength conversion sheet, it can be said that the sulfide phosphor has high reliability even in a high temperature and high humidity environment.
(7) In the above embodiment, the dot-shaped coloring portion is circular or square, but the dot-shaped coloring portion of the present invention is not limited to these shapes, and is not limited to these shapes, for example, a triangular shape. There are no particular restrictions as long as the object of the present invention is not impaired, such as a polygonal shape such as an elliptical shape, an irregular shape, or the like.
(8) In the above embodiment, the unit area of the reflective sheet may be the area of a square having a side length of 10 mm as the unit area.
(9) In the above embodiment, the transmissive liquid crystal display device is illustrated, but the present invention can also be applied to a semi-transmissive liquid crystal display device.
(10) In the above embodiment, a liquid crystal display device using a liquid crystal panel as a display panel has been illustrated, but the present invention can also be applied to a display device using another type of display panel.
(11) In the above embodiment, a television receiving device provided with a tuner has been illustrated, but the present invention can also be applied to a display device not provided with a tuner (for example, an electronic signage, an electronic blackboard, etc.).
(12) In the above embodiment, the colored portions on the bottom reflecting portion are arranged in a matrix, but the present invention is not limited to this, and for example, a so-called staggered arrangement, an irregular arrangement, or the like. May be good.

10 ... Liquid crystal display (display device), 11 ... Liquid crystal panel, 11a ... Display surface, 11b ... Back, 11c ... Shading part, 12 ... Lighting device, 13 ... Bezel, 14 ... Chassis, 14a ... Bottom, 14b ... Light emission Part, 14c ... Side wall, 14d ... Receiving part, 14e ... Standing wall, 15 ... Optical member, 15a ... Diffusing plate, 15a1 ... First diffusing plate, 15a2 ... Second diffusing plate, 15b ... Optical sheet, 16 ... Frame ( Frame-shaped member), 16a ... Covered part, 16b ... Outer wall part, 17 ... LED (light source), 17a ... Light emitting surface, 18 ... LED substrate, 18a ... Mounting surface, 19 ... Reflective sheet, 19a ... Bottom side reflecting part, 19b ... Inclined reflection part, 19c ... Extension part, 19d ... Insertion part, 30 ... Coloring part, 21 ... Wavelength conversion sheet, 22 ... Lens sheet, 23 ... Reflective polarizing sheet, AA ... Display area, NAA ... Non-display area , S1 ... Lighting area, S2 ... Extinguishing area, R ... Peripheral part of lighting area

Claims (11)

Multiple light sources, each with a light emitting surface that emits light,
A chassis having a bottom arranged on the opposite side of the light emitting surface and accommodating a plurality of the light sources in a state of being spaced from each other.
A wavelength conversion sheet including a phosphor that is arranged in a state of facing the light emitting surface and separated from the light source and that converts the light emitted from the light emitting surface into wavelength.
A reflective sheet that reflects light emitted from the light emitting surface toward the wavelength conversion sheet, and has a reflective sheet having a bottom reflecting portion that covers the bottom while exposing a plurality of the light sources.
A plurality of dot-shaped colored portions arranged on the surface of the bottom reflecting portion, each having the same color as the light emitted from the light emitting surface or the same color as each primary color light constituting the light. Prepare ,
Among the adjacent light sources, the color-developing portion has a higher density or color density per unit area on the central side between the light sources than near the light sources.
The light source emits magenta-colored light including blue light and red light from the light emitting surface.
The wavelength conversion sheet contains, as the phosphor, a green phosphor that converts the wavelength of the blue light into green light.
The color-developing portion includes a blue-colored portion exhibiting blue and a red-colored portion exhibiting red, and the bottom-side reflection in a form in which the blue-colored portion and the red-colored portion are alternately arranged. A lighting device placed on the surface of the part. The lighting device according to claim 1, wherein the color-developing portion has a light absorption rate having a complementary color relationship with the color of the light emitted from the light emitting surface, which is higher than the absorption rate of the light emitted from the light emitting surface. .. The color-developing portion according to claim 1 or 2, wherein the reflectance of the light emitted from the light emitting surface is higher than the reflectance of the light having a complementary color relationship with the light emitted from the light emitting surface. Lighting device. The lighting device according to any one of claims 1 to 3, wherein the color-developing portion has a uniform density per unit area or a uniform color density. The color-developing portion is claimed from claim 1 in which the color-developing portion is arranged in the bottom-side reflective portion of the reflective sheet at a location where more light wavelength-converted by the phosphor is supplied than light emitted from the light source. Item 4. The lighting device according to any one of items 4. The lighting device according to any one of claims 1 to 5 , wherein the wavelength conversion sheet contains a sulfurized phosphor as the phosphor. The lighting device according to any one of claims 1 to 6 , wherein the color-developing portion is made of a coating film. A claim comprising a control means for emitting light only from a specific region in which the lit light source is arranged by turning on only a part of the light sources and turning off the remaining light sources among the plurality of the light sources. The lighting device according to any one of claims 1 to 7. The illuminating device according to claim 8 , wherein the color-developing portion is arranged on a peripheral edge of a specific region in which the lit light source is arranged. The lighting device according to any one of claims 1 to 9.
A display device including a display panel that displays an image using the light emitted from the lighting device. A television receiver comprising the display device according to claim 1 0.

Images