JP2018181813A - Lighting device, display device, and television receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device and the like suppressed in color unevenness.SOLUTION: A lighting device 12 has a light source 17 having a light-emitting face 17a, a chassis 14 having a bottom portion 14a disposed at a side opposite to the light-emitting face 17a, and housing the light source 17, a lenticular diffuser 15a disposed in a state of separating from the light source 17, and providing the light emitted from the light-emitting face 17a with diffusion function, a reflection sheet 19 having a bottom-side reflecting portion 19a covering a bottom portion 14a while exposing the light source 17, and an inclined reflecting portion 19b rising toward a lenticular diffuser 15a side while inclined to an outer side from the bottom-side reflecting portion 19a, a plurality of dot-like coloring portions 20 respectively giving a color same as the light emitted from the light-emitting face 17a, or a color same as each primary color light constituting the light, and disposed on at least a surface of the inclined reflecting portion 19b, and a wavelength conversion sheet 21 disposed at a light-emitting side of the lenticular diffuser 15a, and including a fluorescent body converting wavelength of light emitted from the light-emitting face 17a and penetrating through the lenticular diffuser 15a.SELECTED DRAWING: Figure 4

Description

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

  The thing of patent document 1 is mentioned as an example of the conventional liquid crystal display device. The liquid crystal display device includes a liquid crystal panel and a so-called direct backlight device (illumination device). This backlight device has a configuration in which a plurality of light sources are arranged in a matrix immediately below the liquid crystal panel, and supplies white light spread in a plane toward the back of the liquid crystal panel.

  The backlight device is disposed in a state separated from the light source and a light source emitting blue light or the like as primary light, and wavelength-converts part of the primary light to emit other light (secondary light) And a wavelength conversion sheet. In the backlight device, white light is generated by additive color mixing of the primary light emitted from the light source and the other light (secondary light) wavelength-converted by the wavelength conversion sheet.

  The backlight device further includes an optical member such as a diffusion plate disposed apart from the light source, in addition to the wavelength conversion sheet. Further, in the backlight device, a reflective sheet for reflecting light and the like reflected by an optical member or the like and returned to the light source side is provided. The center side of the reflection sheet is disposed to face the screen center side of the liquid crystal panel, and the peripheral side faces the screen peripheral side of the liquid crystal panel in a state of being inclined while rising toward the liquid crystal panel .

International Publication No. 2016/136787

  The light (return light) returned to the reflective sheet side includes light (secondary light) which has already been wavelength-converted by the wavelength conversion sheet. For example, when white light including wavelength-converted light (secondary light) is emitted from the wavelength conversion sheet and then reflected by an optical member or the like disposed on the front side of the wavelength conversion sheet, the light is It is returned to the reflective sheet side as light returning. When such return light is repeatedly incident on the wavelength conversion sheet repeatedly and wavelength conversion is performed many times, as a result, the ratio of primary light from the wavelength conversion sheet is low and secondary light is A high proportion of light (that is, light having a secondary light color) is emitted. Such return light is likely to be generated on the screen peripheral side (the end sides of the reflective sheet and the optical member) of the liquid crystal panel in which the distance between the reflective sheet and the optical member is short and the light tends to be multiple reflected.

  In the conventional backlight device, the relationship between the arrangement of the wavelength conversion sheet and the return light including secondary light has not been taken into consideration at all.

  In the conventional backlight device, in order to suppress the emission of light having a high ratio of secondary light as described above, the color tone of the light of the light source on the surface of the inclined rising portion of the reflective sheet A so-called solid-colored coloring portion was formed. The color developing unit has a function of reflecting primary light and absorbing secondary light.

  However, when a part of the light (primary light) emitted from the light source is reflected by the colored portion, the light may be directed not to the screen peripheral side but to the screen center side nearby. Therefore, in the conventional backlight device, light having a high ratio of primary light to secondary light (that is, light having a color of primary light) may be emitted on the screen center side near the screen periphery. The

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

  An illumination device according to the present invention includes a light source having a light emitting surface that emits light, and a bottom portion disposed on the opposite side of the light emitting surface, and a chassis that houses the light source, and the light source facing the light emitting surface. A wrench diffusion plate for diffusing light emitted from the light emitting surface, and a reflecting sheet for reflecting the light emitted from the light emitting surface toward the wrench diffusion plate. A reflecting sheet having a bottom side reflecting portion covering the bottom portion while exposing the light source, and a sloped reflecting portion rising toward the wrench diffusion plate side while tilting outward from the bottom side reflecting portion; A plurality of dot-shaped colored portions, which exhibit the same color as the light emitted from the light emitting surface, or the same color as each of the primary color lights constituting the light, and are disposed at least on the surface of the inclined reflection portion, and the wrench diffusion plate Is placed on the light exit side of the And a wavelength conversion sheet containing a phosphor converting the wavelength of being emitted from the surface light transmitted through the wrench diffuser.

  In the illumination device, the wavelength conversion sheet may be disposed so as to overlap the bottom side reflection portion and the inclined reflection portion of the reflection sheet in a plan view.

  The illumination device may include an optical sheet disposed on the light exit side of the wavelength conversion sheet in a state of being thinner than the wrench diffusion plate and separated from the wavelength conversion sheet.

  Another lighting device according to the present invention includes a light source having a light emitting surface that emits light, and a bottom portion disposed on the opposite side of the light emitting surface, and a chassis that accommodates the light source; And a wrench diffusion plate for diffusing light emitted from the light emitting surface, the thickness of the wrench diffusion plate being smaller than that of the wrench diffusion plate, and on the light emission side of the wrench diffusion plate An optical sheet to be disposed, and a wavelength conversion sheet including a phosphor that is disposed on the light exit side of the optical sheet and that converts the wavelength of light emitted from the light emitting surface and transmitted through the wrench diffusion plate and the optical sheet .

  In the illumination device, a reflecting sheet that reflects light emitted from the light emitting surface toward the wrench diffusion plate, the bottom side reflecting portion covering the bottom while exposing the light source, and the bottom side reflecting portion A reflection sheet having an inclined reflection portion rising toward the wrench diffusion plate side while being inclined outward, and each exhibiting the same color as the light emitted from the light emitting surface or each primary color constituting the light The light emitting device may further include a plurality of dot-shaped colored portions disposed on at least a surface of the inclined reflective portion.

  In the lighting device, the optical sheet is preferably disposed in a state of being separated from the wrench diffusion plate.

  In the lighting device, the optical sheet is preferably made of a lens sheet.

  The lighting device may further include another optical sheet disposed on the light output side of the wavelength conversion sheet, and the other optical sheet may be formed of a reflective polarizing sheet.

  In the lighting device, the wrench diffusion plate is preferably made of two or more.

  In the lighting device, it is preferable that the colored portion has a higher density or color density per unit area as it goes outward from the bottom side reflecting portion side.

  In the lighting device, the light source emits magenta light including blue light and red light from the light emitting surface, and the wavelength conversion sheet, as the phosphor, is a green phosphor which wavelength-converts the blue light to green light. May be included.

  In the lighting device, the light source emits blue light from the light emitting surface, and the wavelength conversion sheet includes, as the phosphor, a green phosphor for converting the wavelength of the blue light into green light, and a red light of the blue light And red phosphors for wavelength conversion.

  In the lighting device, the wavelength conversion sheet preferably contains a sulfurized phosphor as the phosphor.

  Moreover, the display apparatus which concerns on this invention is equipped with the display apparatus which displays an image using the illumination device in any one of the said, and the light irradiated from the said illumination device.

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

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

The disassembled perspective view which shows schematic structure of the television receiver which concerns on Embodiment 1 of this invention Sectional view on line AA of the liquid crystal display device shown in FIG. 1 Plan view of the illumination device provided in the liquid crystal display device An enlarged sectional view of the liquid crystal display shown in FIG. Sectional view of liquid crystal display device according to Embodiment 2

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

  As shown in FIG. 1, the television receiver 10TV mainly includes a liquid crystal display device (an example of a display device) 10 and front and back cabinets 10Ca and 10Cb that accommodate the liquid crystal display device 10 from both front and back (front and back) sides. , A power supply 10P, a tuner (reception unit) 10T for receiving a television signal, and a stand 10S. The liquid crystal display device 10 generally has a horizontally long rectangular shape elongated in the left-right direction (X-axis direction). 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 for supplying light to the liquid crystal panel 11. The liquid crystal panel 11 and the frame-like bezel 13 and the like for holding the lighting device 12 and the like are provided.

  The liquid crystal panel 11 mainly includes a pair of transparent substrates and a liquid crystal layer sealed so as to be sandwiched therebetween, and a panel using the light emitted from the lighting device 12 Display the image in a visible state on the surface. In FIG. 2, the display surface 11 a on the front side of the liquid crystal panel 11 is shown on the upper side, and the back surface 11 b on the rear side is shown on the lower side. The liquid crystal panel 11 generally has a horizontally long rectangular shape in plan view. One of the pair of substrates constituting the liquid crystal panel 11 is an array substrate, and TFTs (Thin Film Transistors) as switching elements, pixel electrodes and the like are arranged in a matrix on a transparent glass substrate. It consists of An alignment film or the like is further formed on the inner surface (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 on which color filters of red, green and blue are arranged in a matrix. Inside the CF substrate (on the liquid crystal layer side), a black matrix for partitioning the color filter in a grid, a frame-shaped light shielding portion 11c disposed along the periphery of the liquid crystal panel 11, and an alignment film and the like are formed. It is done. In addition, polarizing plates are respectively disposed on the outer sides of the TFT substrate and the CF substrate.

  Of the display surface (screen) 11 a of the liquid crystal panel 11, a portion inside the frame-shaped light shielding portion 11 c is a display area AA in which an image is displayed. The frame-shaped area outside the display area AA is a non-display area NAA in which an image is not displayed. The display area AA has a horizontally long rectangular shape in plan view. The light shielding portion 11c has a frame shape surrounding the display area AA in plan view.

  The lighting device 12 is disposed on the back surface 11 b side of the liquid crystal panel 11 and supplies light toward the liquid crystal panel 11. The illumination device 12 is configured to emit white light. The illumination device 12 of the present embodiment is a so-called direct type. The illumination device 12 mainly includes a chassis 14, an optical member 15, a frame 16, and an LED substrate (light source substrate) 18 on which an LED (light source) 17 is mounted as shown in FIG. And a wavelength conversion sheet 21 and the like.

  The chassis 14 is generally in the form of a shallow box having a shallow bottom opened on the front side (light emitting side, liquid crystal panel 11 side), and is made of, for example, a metal plate such as an aluminum plate or electrogalvanized steel plate (SECC). Be done. The opening of the chassis 14 is a light emitting portion 14 b. In the same manner as the liquid crystal panel 11 and the like, the chassis 14 is inclined outward from the plate-like bottom portion 14a having a substantially rectangular shape in plan view and the four sides (peripheries) of the bottom portion 14a to the front side (light emission side) It has a plate-like side wall portion 14c which stands up, a plate-like receiving portion 14d which protrudes outward from the rising end of each side wall portion 14c, and an upright wall portion 14e which rises to the front side from each receiving portion 14d. In addition, the light emission part 14b consists of an inner part enclosed by the standing wall part 14e. Inside the chassis 14, various members such as the LED substrate 18 on which the LEDs 17 are mounted, the reflective sheet 19, the optical member 15, and the wavelength conversion sheet 21 are accommodated. In such a chassis 14, the LED substrate 18 is housed with the back surface side facing the bottom portion 14 a. That is, the bottom portion 14 a is disposed on the side opposite to the light emitting surface 17 a 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 from the front side with respect to such a receiving portion 14d. The upright 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 placed on the receiving portion 14d. . Further, the frame-like frame 16 is assembled to the standing wall portion 14e. Note that substrates such as a control substrate and an LED driving substrate (not shown) are attached to the outside of the chassis 14. In each of the drawings, the chassis 14 is shown such that the long side direction coincides with the X axis direction and the short side direction coincides with the Y axis direction.

  Similar to the liquid crystal panel 11 and the like, the optical member 15 has a substantially rectangular shape in plan view, and is set to be larger than the display area AA of the liquid crystal panel 11. The outer edge of the optical member 15 is placed on the receiving portion 14 d or the like of the chassis 14 to cover the light emitting portion 14 b of the chassis 14 and disposed between the liquid crystal panel 11 and the LED 17. Such an optical member 15 faces the light emitting surface 17 a in a state of being separated from the LED 17. The optical member 15 is disposed on the back side (LED 17 side), and is disposed on the wrench diffusion plate 15a placed on the receiving portion 14d of the chassis 14 and on the front side (liquid crystal panel 11 side) and on the frame 16 fixed to the receiving portion 14d. And the optical sheet 15b placed on the The wrench diffusion plate 15a has a configuration in which a large number of diffusion particles are dispersed in a substantially transparent resin plate having a predetermined thickness. The wrench diffusion plate 15a of the present embodiment includes a first wrench diffusion plate 15a1 disposed on the back side and a second wrench diffusion plate 15a2 disposed on the front side. On the surface of the first wrench diffusion plate 15a1, a plurality of lenticular lenses (lens portions) aligned in the short side direction (Y axis direction) are formed while extending along the long side direction (X axis direction). On the surface of the diffusion plate 15a2, a plurality of lenticular lenses (lens portions) aligned in the long side direction (X axis direction) are formed while extending along the short side direction (Y axis direction). The lenticular lens (lens part) of the first wrench diffusion plate 15a1 and the lenticular lens (lens part) of the second wrench diffusion plate 15a2 are respectively formed on transparent plate-like base parts. The first wrench diffusion plate 15a1 and the second wrench diffusion plate 15a2 are stacked such that their lenticular lenses cross each other. As described later, the wavelength conversion sheet 21 is superimposed on the front side of the wrench diffusion plate 15a.

  The optical sheet 15b is in the form of a sheet having a thickness smaller than that of the wrench diffusion plate 15a, and is formed of two sheets. Specifically, it is composed of a lens sheet (press sheet) 22 and a reflective polarizing sheet 23 superimposed on the front side of the lens sheet 22. The optical sheet 15 b is disposed in the chassis 14 so as to face the wavelength conversion sheet 21 on the wrench diffusion plate 15 a from the front side in a separated state.

  The lens sheet 22 is composed of a sheet-like base and a prism portion provided on the front surface of the base. The prism portion is configured by a plurality of unit prisms arranged in the short side direction (Y axis direction) while extending along the long side direction (X axis direction). The lens sheet 22 is provided with such a prism portion to selectively condense the light from the side of the wrench diffusion plate 15a (the side of the wavelength conversion sheet 21) in the arrangement direction (Y-axis direction) of the unit prisms Anisotropic light condensing effect).

  The reflective polarizing sheet 23 comprises a reflective polarizing film and a pair of diffusion films sandwiching 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 and reflects s waves to the back side of light from the lens sheet 22. The s-wave reflected by the reflective polarizing film is again reflected to the front side by a reflective sheet 19 or the like described later, and at that time, it is separated into s-wave and p-wave. Thus, by providing the reflective polarizing film, the reflective polarizing sheet 23 reflects the s-wave, which is originally absorbed by the polarizing plate of the liquid crystal panel 11, to the back side (the reflective sheet 19 side). It can be effectively used and light utilization efficiency (brightness) can be enhanced. The pair of diffusion 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 for imparting a diffusion function to light.

  The frame (frame-like member) 16 is a frame-like member opened on the front side of the chassis 14 and opened at the inside. The frame 16 is made of, for example, a synthetic resin and is white-painted to have light reflectivity. The frame 16 has a frame shape in a plan view, and the inner peripheral edge side covers the circumferential end of the wavelength conversion sheet 21 housed in the chassis 14 from the front side, and the chassis 14 from the covering portion 16 a And an outer wall portion 16b attached from the outside to the standing wall portion 14e of the chassis 14 while extending toward the bottom portion 14a side of the housing.

  The covering portion 16 a of the frame 16 sandwiches the circumferential end portion of the laminate including the wrench diffusion plate 15 a and the wavelength conversion sheet 21 housed in the chassis 14 with the receiving portion 14 d. The covering portion 16 a is in contact with the peripheral end portion of the wavelength conversion sheet 21 placed on the wrench diffusion plate 15 a 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. Furthermore, the covering portion 16a is configured to receive the peripheral end of the optical sheet 15b on the front side. The liquid crystal panel 11 is placed on the covering portion 16 a of the frame 16 in a state of being superimposed on the front side of the optical sheet 15 b. The laminate formed of the optical sheet 15 b and the liquid crystal panel 11 is positioned by being held between the covering portion 16 a of the frame 16 and the bezel 13 disposed on the front side.

  Most of the covering portion 16 a of the frame 16 is disposed in the non-display area NAA of the liquid crystal panel 11, but the end portion on the inner peripheral edge side of the covering portion 16 a enters the display area AA of the liquid crystal panel 11. That is, the covering portion 16a is disposed from the non-display area NAA to the display area AA. Note that the covering portion 16 a protrudes to the display area AA side more than the receiving portion 14 d of the chassis 14.

  The LED 17 is surface mounted on the LED substrate 18 so that the light emitting surface 17 a faces the liquid crystal panel 11 (optical member 15). The LED 17 is a so-called top surface light emission type in which the light emitting surface 17 a faces the opposite side to the LED substrate 18 side. The optical axis of the light emitted from the light emitting surface 17 a of the LED 17 coincides with the normal direction of the display surface of the liquid crystal panel 11. Here, the “optical axis” refers to an axis that coincides with the direction of the light with the highest light emission intensity among the light emitted from the light emitting surface 17 a 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 range of about 420 nm to about 500 nm) as a light emission source. The LED 17 comprises a blue LED chip sealed in a predetermined case by 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 disposed outside the case by a lead frame (not shown). The sealing material is made of a transparent resin in which a red phosphor is dispersed. 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 red light (wavelength region of about 600 nm to about 780 nm). As a result, from the light emitting surface 17 a of the LED 17, 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 is emitted. In the present 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 the present embodiment. The plurality of LED substrates 18 are disposed on the bottom portion 14 a of the chassis 14 in an aligned state while aligning the directions of the respective sides with each other. Each LED board 18 is disposed such that each side thereof coincides with the X-axis direction and the Y-axis direction. The LED substrate 18 is formed, for example, by forming a wiring pattern made of a metal film such as copper foil on the surface of a plate made of an aluminum-based material via an insulating layer. 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 plate surface on the front side of the LED substrate 18. In addition, the plate surface of the front side of LED board 18 is called the mounting surface 18a. Each LED 17 is electrically connected to the wiring pattern formed in the mounting surface 18a.

  On one LED substrate 18, a plurality of LEDs 17 are arranged in a matrix while keeping a distance from each other. Further, all the LEDs 17 are arranged in a matrix on the bottom portion 14 a of the chassis 14 while maintaining a space therebetween. That is, the plurality of LEDs 17 are disposed on the bottom 14 a side of the chassis 14 in a planarly spread state. All the LEDs 17 are disposed so as to be accommodated in the display area AA of the liquid crystal panel 11 in a plan view. The LEDs 17 are 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 substrate 18 is provided with a connector portion to which a wiring member (not shown) is connected, and driving power is supplied from the LED driving substrate through the wiring member. In addition, each LED 17 on each LED board 18 can be controlled by the LED driving board to perform partial drive (local dimming).

  The reflective sheet (reflective member) 19 is formed of a white sheet having excellent light reflectivity, and is formed of, for example, a white foamable plastic sheet (foamable polyethylene terephthalate sheet). The reflective sheet 19 is generally assembled in a shallow bottom box shape opened on the front side, 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 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 described later, a plurality of colored portions 20 and the like 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 reflection sheet 19 has a rectangular bottom side reflection portion 19a covering the bottom portion 14a of the chassis 14 and the liquid crystal panel 11 side (wavelength conversion while inclining outward from each side edge corresponding to the four sides of the bottom side reflection portion 19a It includes four inclined reflecting portions 19b rising toward the sheet 21), and an extending portion 19c extending outward from the inclined reflecting portions 19b and covering the receiving portion 14d of the chassis 14. The bottom side reflection part 19a is a part which covers the surface (mounting surface) 18a of all the LED boards 18 arrange | positioned on the bottom part 14a collectively collectively. The bottom-side reflection portion 19a is provided with a plurality of opening-like insertion portions 19d, and each LED 17 on the LED substrate 18 is inserted into each insertion portion 19d, and each insertion portion 19d is inserted into each of the insertion portions 19d. The LED 17 is exposed.

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

  The extended portion 19c is generally in the form of a frame surrounding the bottom reflective portion 19a and the inclined reflective portion 19b. The extending portion 19c extends to the tip of each of the long side inclined reflecting portions 19b3 and 19b4 and a pair of short side extending portions 19c1 and 19c2 extended to the end of the short side inclined reflecting portions 19b1 and 19b2. It comprises a pair of long side extending portions 19c3 and 19c4 to be provided.

  In the front and back direction (Z-axis direction), the extending portion 19c is the peripheral end of the optical member 15 (the wrench diffusion plate 15a and the optical sheet 15b) disposed on the front side, and the peripheral end of the wavelength conversion sheet 21. It is placed on the receiving portion 14 d of the chassis 14 so as to overlap. In addition, although the extended portion 19c is mostly overlapped with the non-display area NAA of the liquid crystal panel 11 in a plan view, a part thereof is overlapped with the display area AA. That is, the extending portion 19c is formed from the non-display area NAA to the display area AA. The covering portion 16a of the frame 16 protrudes inward (toward the display area AA) with respect to the extending portion 19c. The extending portion 19c is completely covered with the covering portion 16a in a plan view.

The wavelength conversion sheet 21 includes a phosphor layer containing a phosphor for converting the wavelength of light from the LED 17 and a pair of transparent base layers sandwiching the phosphor layer from the front and back. The phosphor layer is made of a resin in which a large number of phosphors are dispersed. As a fluorescent substance in a fluorescent substance layer, a green fluorescent substance which is excited by blue light (monochromatic light) emitted from the LED 17 and emits green light (wavelength range of about 500 nm to about 570 nm) is used. As such a green phosphor, one having a relatively sharp emission spectrum is preferable. For example, a sulfide phosphor such as “SrGa ₂ S ₄ : Eu ²⁺ ” is used.

  The wavelength conversion sheet 21 has a rectangular shape in plan view similarly to the liquid crystal panel 11 and the like, and has a size substantially equal to that of the wrench diffusion plate 15 a of the optical member 15. That is, the wavelength conversion sheet 21 is set 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 smaller thickness than the wrench diffusion plate 15 a, and is mounted on the wrench diffusion plate 15 a in the chassis 14. Specifically, among the wrench diffusion plates 15a in a two-ply state, they are disposed so as to cover the surface of the second wrench diffusion plate 15a2 disposed on the front side. In the state where the peripheral end of the wavelength conversion sheet 21 is placed on the front side of the wrench diffusion plate 15a (the second wrench diffusion plate 15a2) in the front and back direction (Z-axis direction), the receiving portion 14d of the chassis 14 and the receiving portion It faces so as to overlap with the extending portion 19c of the reflection sheet 19 placed on 14d. In addition, the peripheral end of the wavelength conversion sheet 21 is placed between the cover 16 a of the frame 16 and the receiving part 14 d of the chassis 14 together with the peripheral end of the wrench diffusion plate 15 a in a state of being mounted on the wrench diffusion plate 15 a. It is held by

  In the chassis 14, the area in which the LEDs 17 are disposed is substantially the same as the area in which the bottom-side reflection portion 19 a of the reflection sheet 19 is disposed. That is, the LED 17 is not disposed in the area where the inclined reflective portion 19 b and the extending portion 19 c of the reflective sheet 19 are disposed. Therefore, in the illumination device 12, the primary light (magenta light) emitted from the LED 17 is less likely to be supplied to the inclined reflection portion 19b compared to the bottom side reflection portion 19a, and the light amount related to the primary light (magenta light) from the LED 17 And the distribution is likely to be high on the central side (bottom side reflection portion 19a) of the display surface 11a (display area AA) and low on the peripheral side (inclined reflection portion 19b) of the display surface 11a (display area AA). It has become. In particular, in the periphery of the display surface 11a (display area AA), the amount of light is likely to decrease as it goes to the outside.

  Further, in the inclined reflection portion 19b, the proportion of light (return light) returned to the reflective sheet 19 side after being reflected by the optical sheet 15b, etc. among the light already wavelength-converted by the wavelength conversion sheet 21 becomes high. easy. The distance between the inclined reflecting portion 19b and the optical member 15 is gradually shortened from the inner side (bottom side reflecting portion 19a) to the outer side (the extending portion 19c), and the reflected light by the inclined reflecting portion 19b is inclined The multiple reflection with the optical member 15 is facilitated as it goes to the outside of the reflecting portion 19 b. Therefore, the wavelength conversion efficiency by the wavelength conversion sheet 21 tends to be relatively high as it goes to the outside of the inclined reflection portion 19 b. In the optical member 15, the light from the reflection sheet 19 side is easily reflected by the wrench diffusion plate 15a disposed closest to the LED 17 side. As described above, the wrench diffusion plate 15a of this embodiment includes two sheets (a plurality of the first wrench diffusion plate 15a1 disposed on the back side (LED 17 side) and the second wrench diffusion plate 15a2 disposed on the front side , Two or more). A lenticular lens is provided on the surface on the light output side of each of the wrench diffusion plates 15a1 and 15a2 so as to cross each other, and in particular, the light supplied from the reflective sheet 19 side is transmitted to each wrench diffusion plate 15a1 and 15a2 It is easy to make multiple reflections.

  In the illumination device 12, when the amount of light (primary light) supplied to the wavelength conversion sheet 21 is biased, the primary light (magenta light) finally emitted from the illumination device 12 and the wavelength conversion sheet 21 The ratio to the wavelength-converted light (secondary light) is different between the center 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 illumination device 12 and the display image of the liquid crystal panel 11. Specifically, on the peripheral side of the display area AA (in particular, the part adjacent to the non-display area NAA), the light quantity of the primary light from the LED 17 becomes relatively small, and that part becomes the color of the secondary light (green ) Will be taken.

  So, in the illuminating device 12 of this embodiment, in order to suppress generation | occurrence | production of such a color nonuniformity, the wavelength conversion sheet 21 is arrange | positioned on the front side (light emission side) of the wrench diffusion plate 15a. The wrench diffusion plate 15 a tends to reflect light from the reflective sheet 19 side toward the reflective sheet 19 side again. Therefore, by disposing the wavelength conversion sheet 21 closer to the liquid crystal panel 11 than such a wrench diffusion plate 15a, light including light (secondary light) already wavelength-converted by the wavelength conversion sheet 21 is wrench diffusion It is suppressed that the light is reflected by the plate 15 a and is incident on the wavelength conversion sheet 21 again. The wavelength conversion sheet 21 is disposed on the light emission side of the second wrench diffusion plate 15a2 on the front side.

  Further, in the lighting device 12 of the present embodiment, in order to suppress the occurrence of the color unevenness, the same color as the light emitted from the light emitting surface 17 a of the LED 17 (that is, A plurality of dot-like colored portions (magenta colored portions) 20 exhibiting a magenta color) are also formed. The color development part 20 consists of a coating film containing the pigment which exhibits a magenta color. Such a coating film is formed of a paint containing the pigment, using a known coating technology (e.g., printing technology). The said coating film is suitably dried as needed. The color developing unit 20 is a light (magenta color light (red light (color light) emitted from the light emission surface 17 a that has an absorptivity of light of a color (green light) in a complementary color relationship with the color of light (magenta light) emitted from the light emission surface 17 a It is higher than the absorptivity of blue light and red light). In addition, the color developing unit 20 is a light of a color (the light emitting surface 17a has a reflectance of light (magenta color light (blue light, red light)) that is complementary to the light emitted from the light emitting surface 17a It is higher than the reflectance of green light). That is, the color developing unit 20 has a function of absorbing green light and reflecting magenta light (blue light, red light). Thereby, light reflected by the color developing unit 20 (for example, return light of white) is magenta as compared with the case where the light emitting unit 20 is not provided and is reflected by the white portion (reflection sheet 19). It will take on.

  As shown in FIG. 3, a plurality of dot-shaped colored portions 20 are formed on the surfaces of the four inclined reflecting portions 19 b disposed around the bottom side reflecting portion 19 a. Each color developing section 20 has a circular shape in plan view, and is formed so as to be scattered over substantially the entire area of the inclined reflecting section 19 b. In addition, the white bottom side reflection part 19a is exposed from between the adjacent color development parts 20. As shown in FIG. Each color development section 20 is set so that the size (size) increases as it goes from the bottom side reflection section 19a side to the outer side (extension section 19c). That is, each colored portion 20 is set to have a higher density per unit area as it goes from the bottom side reflecting portion 19a side to the outside (the extending portion 19c). In the case of the present embodiment, the densities (color depths) of the colored portions 20 are set to be the same. In addition, the colored portions 20 are arranged at equal intervals in the direction in which the boundary between the inclined reflective portion 19 b and the bottom side reflective portion 19 a extends. Each color forming portion 20 is formed so as to be entirely spread over the surface of the inclined reflecting portion 19 b.

  The bottom side reflection portion 19a is provided with a plurality of color development portions 30 of the same color (magenta color) as the light emitted from the light emitting surface 17a of the LED 17 as in the color development portion 20 of the inclined reflection portion 19b described above. The color developing portion 30 is formed for the purpose of adjusting the ratio of the primary light and the secondary light supplied to the bottom side reflecting portion 19a, and is uniformly distributed on the surface of the bottom side reflecting portion 19a. Are arranged in a matrix. The size of each color developing unit 30 is substantially the same. The density (color density) of the colored portion 30 is the same as that of the colored portion 20 of the inclined reflective portion 19 b. In addition, since the light (primary light) from the LED 17 is sufficiently supplied compared to the inclined reflection portion 19b side on the bottom side reflection portion 19a side, the color change portion 30 is However, they are set smaller than the color developing unit 20. The colored portions 30 provided on the outermost side of the bottom-side reflecting portion 19a are smaller in size than the colored portions 30 provided on the inner side, for convenience of manufacturing equipment.

  Further, the extended portion 19c is also provided with a plurality of colored portions 40 of the same color (magenta color) as the light emitted from the light emitting surface 17a of the LED 17 similarly to the colored portions 20 of the inclined reflecting portion 19b described above. . The colored portions 40 of the present embodiment are arranged in a frame shape surrounding the bottom side reflection portion 19a and the inclined reflection portion 19b as a whole while being uniformly arranged on the surface of the extended portion 19c. ing. The size of each color developing portion 40 is substantially the same. The colored portion 30 of the bottom-side reflecting portion 19a and the colored portion 40 of the extending portion 19c absorb green light as in the case of the colored portion 20 of the inclined reflecting portion 19b and form magenta light (blue light, red light ) Has a function to reflect.

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

  Here, the optical action of the optical member 15 and the wavelength conversion sheet 21 in the illumination device 12 will be described in detail. From the light emitting surface 17 a of the LED 17, magenta light composed of blue light and red light is emitted as primary light. The primary light from the LED 17 is given a diffusing action by the wrench diffusion plate 15a (the first wrench diffusion plate 15a1 and the second wrench diffusion plate 15a2), and then part of the diffusion light is applied to the wavelength conversion sheet 21 on the wrench diffusion plate 15a. Incident to Among the primary light incident on the wavelength conversion sheet 21, a 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, together with the green light, the blue light and the red light transmitted without being wavelength converted are emitted. Thus, white light is formed from the wavelength conversion sheet 21 by emitting primary light (blue light, red light) from the LED 17 and secondary light (green light) obtained after wavelength conversion. Be done.

  The primary light (blue light, red light) emitted from the wavelength conversion sheet 21 and the secondary light (green light) are incident on the lens sheet 22 to be provided with a condensing action, and then reflected polarized light In the sheet 23, specific polarized light (p wave) is selectively transmitted to the liquid crystal panel 11, and different specific polarized light (s wave) is selectively reflected to the back side. Light of s wave reflected by the reflection type polarizing sheet 23, light reflected toward the back without being given a condensing action by the lens sheet 22, and light reflected toward the back by the wrench diffusion plate 15a , Etc. are reflected by the reflection sheet 19 and travel toward the front side again.

  Next, the optical actions of the reflective sheet 19 and the color developing unit 20 will be described in detail. The reflection sheet 19 includes primary light (magenta light consisting of blue light and red light) from the LED 17 not directly facing the optical member 15 side, and light (primary light and secondary light) returned to the back side by the optical member 15 or the like. ) Is reflected toward the front side. In the reflection sheet 19, the color development portion 20 is formed in the inclined reflection portion 19 b so that the density per unit area is higher than that of the bottom side reflection portion 19 a. Therefore, even if the amount of primary light supplied to the inclined reflection portion 19b is smaller than the amount of primary light supplied to the bottom reflection portion 19a, the colored portion 20 is more on the inclined reflection portion 19b side. In order to reflect the primary light (magenta light), it is suppressed that a color difference is generated between the reflected light on the side of the inclined reflecting portion 19b and the reflected light on the side of the bottom side reflecting portion 19a.

  In addition, multiple reflections occur between the inclined reflection portion 19b and the optical member 15, and the wavelength conversion efficiency of light by the wavelength conversion sheet 21 locally increases, and secondary light (green light) is generated on the inclined reflection portion 19b side. Even if a large amount of light is supplied, the colored portion 20 absorbs a large amount of secondary light (green light) on the side of the inclined reflection portion 19b, so the reflected light on the side of the inclined reflection portion 19b and the bottom side reflection portion 19a side It is suppressed that a color difference arises between it and the reflected light in. That is, as shown in FIG. 4, when white light L1 is supplied as return light to the side of the inclined reflection portion 19b, magenta light (blue light, red light) which is primary light is reflected by the color developing portion 20, It is supplied to the wrench diffusion plate 15a side (wavelength conversion sheet 21 side). On the other hand, the secondary light (green light) contained in the white light L1 is absorbed by the color changing portion 20. As a result, it is possible to suppress the emission of the greenish light R1 from the illumination device 12 at a portion corresponding to the peripheral edge of the display area AA of the liquid crystal panel 11.

  As described above, in the illumination device 12 of the present embodiment, the wavelength conversion sheet 21 is disposed on the front side (light exit side) of the wrench diffusion plate 15a, and light already converted in wavelength by the wavelength conversion sheet 21 (secondary It is suppressed that light (white light) containing light) is reflected by the wrench diffusion plate 15 a and is incident on the wavelength conversion sheet 21 again. As a result, the proportion of white light (including secondary light) supplied to the side of the inclined reflection portion 19 b of the reflection sheet 19 is reduced, and from the illumination device 12 of the portion corresponding to the periphery of the display area AA of the liquid crystal panel 11 It is further suppressed that the greenish light R1 is emitted.

  In such an illumination device 12, the amount of primary light and the like supplied to the screen center side (center side of the display area AA) and the screen peripheral side (peripheral side of the display area AA) of the wavelength conversion sheet 21 are homogenized. As a result, the color of the emitted light emitted from the illumination device 12 is homogenized, and the color unevenness is suppressed.

  In the primary light (magenta light consisting of blue light and red light) emitted from the light emitting surface 17a of the LED 17, the wrench diffusion plate 15a (first wrench) is used before wavelength conversion by the wavelength conversion sheet 21. There is also a light (primary light) L3 which is reflected by the diffusion plate 15a1 and the second wrench diffusion plate 15a2 and travels toward the inclined reflection portion 19b of the reflection sheet 19 (see FIG. 4). Although a part of such light L3 is reflected by the colored part 20 on the inclined reflective part 19b, it travels toward the peripheral side of the display area AA, but the colored part 20 is included in the light L3. And the light L4 that travels toward the center side of the display area AA (inside of the peripheral side of the display area AA). In the center side of the display area AA, since the LED 17 is disposed immediately below, the primary light is sufficiently supplied.

  The light L4 is magenta light (primary light), as is the light emitted from the LED 17. When a large amount of such light L4 is supplied, a portion where the amount of primary light (in particular, red light) becomes too large is formed on the center side of the display area AA (inner than the peripheral side of the display area AA), As a result, from the lighting device 12, there is a risk that the reddish light R2 will be emitted as color unevenness corresponding to the location (see FIG. 4). However, in the illumination device 12 of the present embodiment, as described above, since the wavelength conversion sheet 21 is disposed on the front side (light exit side) of the wrench diffusion plate 15a, the light L4 is reflected by the wrench diffusion plate 15a. It is easy to repeat the reflection between the wrench diffusion plate 15a and the reflection sheet 19 (bottom side reflection part 19a etc.), and it is easy to spread while spreading in the surface direction. Therefore, in the lighting device 12, the emission of the reddish light R2 as described above is suppressed, and the color of the emitted light is homogenized.

Second Embodiment
Next, a second embodiment of the present invention will be described with reference to FIG. The liquid crystal display device 10A of the present embodiment includes an illumination device 12A in which the position of the wavelength conversion sheet 21A is changed to the front side (light exit side) of the lens sheet 22 (optical sheet 15b). FIG. 5 is a cross-sectional view of the liquid crystal display device 10A according to the second embodiment. In addition, about the structure similar to Embodiment 1, in FIG. 5, the thing which added suffix "A" to the code | symbol same as Embodiment 1 or the same code | symbol is attached | subjected, and description is abbreviate | omitted.

  By arranging the wavelength conversion sheet 21A on the front side (light output side) of the lens sheet 22, light (white light) containing light (secondary light) already wavelength-converted by the wavelength conversion sheet 21A is obtained. Wrench diffusion plate 15a (15a1 and 15a2) and lens sheet 22 are reflected and it is suppressed that it is again incident on wavelength conversion sheet 21A, moreover, it is reflected in color development part 20 on slope reflection part 19b1 of reflection sheet 19 It is suppressed that the primary light thus collected gathers on the center side of the display area AA (inside of the peripheral side of the display area AA). As described above, by disposing the wavelength conversion sheet 21A on the front side of the lens sheet 22 as well as the wrench diffusion plate 15a, color unevenness (light (color unevenness) R1 of the first embodiment and R1 of the first embodiment are further enhanced. It is possible to suppress the generation of light (color unevenness) (see R2).

  The wavelength conversion sheet 21A of the present embodiment is held between the frame 16A and the bezel 13A together with the lens sheet 22 and the reflective polarizing sheet 23 while being interposed between the lens sheet 22 and the reflective polarizing sheet 23. It is done.

  In addition, in the illumination device 12A, since the wavelength conversion sheet 21A is separated from the LED 17 as compared with the first embodiment, the optical path length is long. Therefore, in the case of the present embodiment, the amount (energy) of primary light (magenta light composed of blue light and red light) from the LED 17 irradiated to the wavelength conversion sheet 21A is reduced as compared with the first embodiment. Therefore, in the present embodiment, it is preferable to increase the content of the phosphor in the wavelength conversion sheet 21A as compared to the first embodiment.

  In the present embodiment, the lens sheet 22 is illustrated as the optical sheet 15b on which the wavelength conversion sheet 21A is mounted, but the wavelength conversion sheet 21A may be mounted on the front side (light exit side) of other optical sheets. . However, it is not preferable to dispose the wavelength conversion sheet 21A on the light output side (front side) of the reflective polarizing sheet 23. This is because, if the wavelength conversion sheet 21A is disposed on the light output side (front side) of the reflective polarizing sheet 23, the light of p wave selected by the reflective polarizing sheet 23 is irradiated to the reflective polarizing sheet 23. It is because it is divided into p wave and s wave, and the utilization efficiency of light will fall.

Other Embodiments
The present invention is not limited to the embodiments described above with reference to the drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the above-mentioned embodiment, although what consisted of a coating film was illustrated as a coloring part, the present invention is not limited to this, for example, it uses the cellophane of the light and light emitted from LED as a coloring part. It is also good. However, as in the above-described embodiment, the colored portion made of a coating film can be formed using an existing coating apparatus (such as a printing apparatus), and the forming speed is preferably high.
(2) In the above embodiment, a colored portion of magenta color (that is, the same color as the light emitted from the light emitting surface of the LED) is used, but the present invention is not limited to this. It may be a colored portion of the same color as each of the primary color lights to be configured. For example, when the light from the LED is magenta light (blue light, red light), a color development portion (blue color development portion) of the same color as blue light (an example of primary color light) constituting magenta light and red light (primary color) An example of light) and a combination of the same colored portion (red colored portion) may be used as a substitute for the magenta colored portion.
(3) In the above embodiment, an LED (light source) that emits magenta light (blue light, red light) is used, but the present invention is not limited to this. For example, using a light source that emits blue light as primary light, wavelength conversion including a green phosphor that converts blue light to green light and a red phosphor that converts blue light to red light as phosphors You may use a sheet. 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 coloration portion (blue coloration is generated on the inclined reflection portion of the reflection sheet, etc. Part) is formed. Also, for example, SrGa ₂ S ₄ : Eu ²⁺ may be used as a green phosphor, and (Ca, Sr, Ba) S: Eu ²⁺ may be used as a red phosphor.
(4) In other cases, even if a light source emitting blue light as primary light is used, and a wavelength conversion sheet including a yellow phosphor which wavelength-converts blue light to yellow light is used as the phosphor. Good. In this case, yellow light is emitted from the wavelength conversion sheet as secondary light whose wavelength is converted by the phosphor, and a blue color development portion (blue color development portion) is formed on the inclined reflection portion etc. of the reflection sheet. It is formed.
(5) In other cases, a light source emitting violet light may be used, and a wavelength conversion sheet including a yellow phosphor and a green phosphor may be used as a phosphor. In this case, a purple colored portion is used as the colored portion.
(6) In other cases, a light source emitting 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 development portion is used as the color development portion.
(7) In the above-mentioned embodiment, although a sulfide fluorescent substance was used as fluorescent substance of a wavelength conversion sheet, this invention is not limited to this, For example, you may use a quantum dot fluorescent substance (Quantum Dot Phosphor). The quantum dot phosphor has discrete energy levels by confining electrons and holes or excitons in a three-dimensional spatial orientation in a semiconductor crystal of nano size (for example, about 2 nm to 10 nm in diameter), By changing the size of the dot, it is possible to appropriately select the peak wavelength (emission color) or the like of the emission light. In addition, since the quantum dot phosphors easily react with oxygen and moisture in the air and deteriorate, and use cadmium and the like which are environmental load substances, as the phosphors of the wavelength conversion sheet, the above-mentioned sulfide phosphors Is preferred. The sulfide phosphor is covered with a silicon dioxide film, and by adding a gas absorbing material to the wavelength conversion sheet, it can be said that the reliability is high even in a high temperature and high humidity environment.
(8) In the above embodiment, circular dots are used as the dot-shaped colored portions, but the dot-shaped colored portions of the present invention are not limited to these shapes, and, for example, quadrangle, triangle, etc. There are no particular limitations on the polygonal shape, the elliptical shape, the irregular shape, and the like as long as the object of the present invention is not impaired.
(9) As a unit area in a reflective sheet, you may utilize the area of the square whose length of one side is 1 mm, for example.
(10) Although the transmission type liquid crystal display device is exemplified in the above embodiment, the present invention is also applicable to a semi-transmission type liquid crystal display device.
(11) Although the liquid crystal display device using the liquid crystal panel as the display panel is illustrated in the above embodiment, the present invention is also applicable to display devices using other types of display panels.
(12) Although the television receiver provided with the tuner has been exemplified in the above embodiment, the present invention is also applicable to a display device (for example, an electronic signboard, an electronic blackboard, etc.) not provided with the tuner.

  DESCRIPTION OF SYMBOLS 10 ... Liquid crystal display device (display device) 11, 11 ... Liquid crystal panel, 11a ... Display surface, 11b ... Back surface, 11c ... Light-shielding part, 12 ... Lighting apparatus, 13 ... Bezel, 14 ... Chassis, 14a ... Bottom part, 14b ... Light emission Sections 14c: Side wall portions 14d: Receiving portions 14e: Upstanding wall portions 15: Optical members 15a: Wrench diffusion plate 15a1: first wrench diffusion plate 15a2: second wrench diffusion plate 15b: optical sheet 16 ... frame (frame-like member), 16a ... coating portion, 16b ... outer wall portion, 17 ... LED (light source), 17a ... light emitting surface, 18 ... LED substrate, 18a ... mounting surface, 19 ... reflective sheet, 19a ... bottom side reflection Portion 19b: Inclination reflection portion 19c: Extension portion 19d: Insertion portion 20, 30, 40: Coloring portion 21: Wavelength conversion sheet 22: Lens sheet 23: Reflective polarizing sheet, AA: Display region, AA ... non-display area, light tinged R1 ... green (color shading), light tinged R2 ... red (color unevenness)

Claims (15)

A light source having a light emitting surface that emits light;
A chassis having a bottom opposite to the light emitting surface, the chassis containing the light source;
A wrench diffusion plate which is disposed in a state of being separated from the light source while facing the light emitting surface, and imparts a diffusing action to light emitted from the light emitting surface;
A reflective sheet that reflects light emitted from the light emitting surface to the wrench diffusion plate side, and a bottom-side reflective portion that covers the bottom while exposing the light source, and is inclined outward from the bottom-side reflective portion A reflection sheet having an inclined reflection portion rising toward the wrench diffusion plate side;
A plurality of dot-shaped colored portions each exhibiting the same color as the light emitted from the light emitting surface, or the same color as each of the primary color lights constituting the light, and disposed at least on the surface of the inclined reflective portion;
An illumination device comprising: a wavelength conversion sheet including a phosphor disposed on the light exit side of the wrench diffusion plate and converting the wavelength of light emitted from the light emitting surface and transmitted through the wrench diffusion plate.   The lighting device according to claim 1, wherein the wavelength conversion sheet is disposed so as to overlap the bottom-side reflection portion and the inclined reflection portion of the reflection sheet in plan view.   The lighting device according to claim 1 or 2, further comprising an optical sheet disposed on the light exit side of the wavelength conversion sheet in a state where the thickness is smaller than the wrench diffusion plate and separated from the wavelength conversion sheet. A light source having a light emitting surface that emits light;
A chassis having a bottom opposite to the light emitting surface, the chassis containing the light source;
A wrench diffusion plate which is disposed in a state of being separated from the light source while facing the light emitting surface, and imparts a diffusing action to light emitted from the light emitting surface;
An optical sheet smaller in thickness than the wrench diffusion plate and disposed on the light exit side of the wrench diffusion plate;
An illumination device comprising: a wavelength conversion sheet disposed on the light exit side of the optical sheet, and including a phosphor for converting the wavelength of light emitted from the light emitting surface and transmitted through the wrench diffusion plate and the optical sheet. A reflective sheet that reflects light emitted from the light emitting surface to the wrench diffusion plate side, and a bottom-side reflective portion that covers the bottom while exposing the light source, and is inclined outward from the bottom-side reflective portion A reflection sheet having an inclined reflection portion rising toward the wrench diffusion plate side;
Each has the same color as the light emitted from the light emitting surface, or the same color as each of the primary color lights constituting the light, and has at least a plurality of dot-shaped colored portions arranged on the surface of the inclined reflection portion The lighting device according to claim 4.   The lighting device according to claim 4, wherein the optical sheet is disposed in a state of being separated from the wrench diffusion plate.   The lighting device according to any one of claims 4 to 6, wherein the optical sheet comprises a lens sheet. And another optical sheet disposed on the light output side of the wavelength conversion sheet,
The lighting device according to any one of claims 4 to 7, wherein the other optical sheet comprises a reflective polarizing sheet.   The lighting device according to any one of claims 1 to 8, wherein the wrench diffusion plate comprises two or more sheets.   The lighting device according to claim 1 or 5, wherein the colored portion has a higher density or color density per unit area as it goes outward from the bottom side reflecting portion side. The light source emits magenta light including blue light and red light from the light emitting surface;
The lighting device according to any one of claims 1 to 10, wherein the wavelength conversion sheet includes, as the phosphor, a green phosphor which wavelength-converts the blue light into green light. The light source emits blue light from the light emitting surface,
The wavelength conversion sheet according to any one of claims 1 to 10, wherein, as the phosphor, a green phosphor for converting the wavelength of the blue light into green light and a red phosphor for converting the wavelength of the blue light into red light. The illuminating device as described in any one.   The lighting device according to any one of claims 1 to 12, wherein the wavelength conversion sheet contains a sulfurized phosphor as the phosphor. The lighting device according to any one of claims 1 to 13,
A display device comprising: a display panel for displaying an image using light emitted from the lighting device.   A television receiver comprising the display device according to claim 14.

Images