JP2013152811A - Lighting device, display device, and television receiving apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain luminance unevenness.SOLUTION: A backlight device (lighting device) 12 includes a chassis 14 having a light emission part 14b for emitting light; LEDs (light sources) 17 stored in the chassis 14 and having a lengthened light-emitting bodies 23 and having anisotrophy on a light-distributing distribution of light emitted toward the light emission part 14b; and an installed diffusion plate 15a as an optical member arranged on the light emission part 14b side against the LEDs 17 and emitting light by giving a complementary optical action to the light from the LEDs 17 to complement the light-distributing distribution of the LEDs 17 in a direction crossing the length direction of the light-emitting bodies 23.

Description

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

  For example, since a liquid crystal panel used for a liquid crystal display device such as a liquid crystal television does not emit light, a backlight device is separately required as a lighting device. This backlight device is installed on the back side of the liquid crystal panel (the side opposite to the display surface), and has a chassis with an open surface on the liquid crystal panel side, a light source accommodated in the chassis, And a reflection sheet that reflects light toward the opening of the chassis, and an optical member (such as a diffusion sheet) that is disposed at the opening of the chassis and efficiently emits light emitted from the light source toward the liquid crystal panel. Is provided. A device using an LED as a light source of such a backlight device is described in Patent Document 1 below.

JP 2006-310319 A

  By the way, when an LED having an anisotropy in its light distribution is used as the light source of the backlight device, there is a concern that luminance unevenness may occur in the emitted light of the backlight device, and it is difficult to deal with it. It was.

  The present invention has been completed based on the above circumstances, and an object thereof is to suppress luminance unevenness.

  The illumination device of the present invention has a chassis having a light emitting part for emitting light, and a light distribution that is accommodated in the chassis and has a light emitting body having a longitudinal shape, and is emitted toward the light emitting part. A light source having anisotropy in distribution, and arranged on the light emitting unit side with respect to the light source, and intersects the light distribution according to the light source with the light source from the light source in the length direction of the light emitter An optical member that emits light by applying a complementary optical action so as to complement the direction.

  In this way, the light emitted from the light source accommodated in the chassis is emitted from the light emitting part of the chassis to the outside after being given a predetermined optical action by the optical member. Since the light source has a light emitting body having a longitudinal shape, the light distribution has anisotropy, and the light emission intensity tends to be insufficient in the direction intersecting the length direction of the light emitting body. Yes. On the other hand, the light emitted from the light source is given a complementary optical action so as to complement the light distribution of the light source in the direction intersecting the length direction of the light emitter by the optical member. The light distribution relating to the light emitted from the section can be made isotropic. Thereby, it is possible to make it difficult for luminance unevenness to occur in the emitted light.

The following configuration is preferable as an embodiment of the present invention.
(1) The optical member includes a selective light condensing unit that selectively condenses light from the light source in a direction intersecting the length direction of the light emitter. If it does in this way, the condensing effect | action will be selectively given to the light which goes to the direction which cross | intersects the length direction of a light-emitting body among the light emitted from the light source by the selective condensing part which an optical member has. It is emitted from. Of the emitted light from the optical member, the light that travels in the direction intersecting the length direction of the light emitter is expanded as the light output range in which a certain level of brightness is obtained as the condensing action is applied. . This makes it difficult for a difference in the light output range in which a certain level or more of luminance can be obtained between the light emitted from the optical member and the light traveling in the length direction of the light emitter and the light traveling in the direction intersecting the length direction. Thus, the emitted light is isotropic.

(2) The selective condensing part has a shape extending along the length direction of the light emitter, and a plurality of prisms arranged side by side along a direction orthogonal to the length direction of the light emitter. Consists of. If it does in this way, the prism of the shape extended along the length direction of a light-emitting body which is a selective condensing part to the light which goes to the length direction of a light-emitting body among the lights from a light source The light collecting action is selectively given by. And since the prism which comprises a selective condensing part is arranged in multiple numbers along the direction orthogonal to the length direction of a light-emitting body, it can condense the light from a light source more efficiently. Thus, luminance unevenness can be made less likely to occur in the emitted light.

(3) The light-emitting body includes a plurality of light-emitting elements arranged along a length direction thereof, and the selective condensing unit is selective in a direction intersecting the arrangement direction of the light-emitting elements to the light from the light source. Is provided with a light condensing action. In this way, since the light emitter is composed of a plurality of light emitting elements, the luminous efficiency is increased and the heat dissipation design is facilitated. Of the light emitted from the light source, the light that travels in the direction intersecting with the direction in which the light emitting elements are arranged is emitted after being selectively given a condensing action by the selective condensing part of the optical member. Of the light emitted from the optical member, the light that travels in the direction intersecting with the direction in which the light emitting elements are arranged has an extended light output range in which a certain level of brightness is obtained as the light condensing action is applied. As a result, it is difficult for a difference in the light output range in which a certain level or higher luminance is obtained between the light emitted from the optical member in the direction in which the light emitting elements are arranged and the light in the direction intersecting with the direction in which the light emitting elements are arranged. Thus, the emitted light is isotropic.

(4) The chassis has a bottom plate disposed on the opposite side of the light emitting portion, and the light sources are arranged in a posture in which a plurality of light distributions are aligned with each other within a plate surface of the bottom plate. It is arranged with. In this way, since the plurality of light sources arranged side by side in the plate surface of the bottom plate have a posture in which the light distribution distribution is aligned with each other, compared to a case where light sources having different postures are included, Costs related to the installation of the light source can be reduced. In addition, even if a plurality of light sources have a posture in which the light distributions are aligned with each other, the light distribution from the light sources intersects with the light source in the length direction of the light source by the optical member. Since a complementary optical action is provided so as to complement the direction, the outgoing light from the light outgoing light is preferably isotropic.

(5) The chassis has a bottom plate arranged on the side opposite to the light emitting portion, and a plurality of the light sources are mounted in a posture in which the light distribution distribution is aligned with each other and along the bottom plate A light source substrate arranged in an extending form is provided. In this way, since the plurality of light sources mounted on the light source substrate are in an attitude in which the light distribution distribution is aligned with each other, it is possible to manufacture the light source board as compared with a case where light sources having different attitudes are included. Cost can be reduced. In addition, even if a plurality of light sources have a posture in which the light distributions are aligned with each other, the light distribution from the light sources intersects with the light source in the length direction of the light source by the optical member. Since a complementary optical action is provided so as to complement the direction, the outgoing light from the light outgoing light is preferably isotropic.

(6) A plurality of the light sources are arranged side by side in the chassis, and the optical member is a planar optical member that is arranged to cover the light emitting portion. In this way, light emitted from a plurality of light sources arranged side by side in the chassis toward the light emitting unit is related to each light source by the planar optical member arranged to cover the light emitting unit. By providing a complementary optical action so as to complement the light distribution distribution in the direction intersecting the length direction of the light emitter, the light distribution distribution related to the light emitted from the light emitting portion can be satisfactorily made isotropic. Can do. Since the optical action can be imparted to the light from the plurality of light sources in the chassis by the planar optical member, the cost can be reduced as compared with the case where the optical member is individually installed for each light source.

(7) The planar optical member is formed on a surface of the light diffusing base material portion for diffusing light from the light source, and on the surface of the light diffusing base material portion. A selective condensing unit that selectively imparts a condensing action in a direction intersecting the length direction. In this way, the light from the light source is diffused by the light diffusing substrate part of the planar optical member, and the light from the light source is intersected with the length direction of the light emitter by the selective condensing part. By selectively condensing, the light from the light source is given a complementary optical action so as to complement the light distribution relating to the light source.

(8) The planar optical member is formed on the surface of the light-transmitting base material portion that transmits light from the light source, and on the surface of the light-transmitting base material portion. A selective condensing unit that selectively imparts a condensing action in a direction intersecting the length direction. If it does in this way, while the light from a light source will be permeate | transmitted by the light-transmissive base-material part which a planar optical member has, about the direction which cross | intersects the length direction of a light-emitting body with the light from a light source by a selective condensing part By selectively condensing, the light from the light source is given a complementary optical action so as to complement the light distribution relating to the light source.

(9) The selective condensing unit extends over the entire length of the planar optical member along a direction orthogonal to a condensing direction, which is a direction for condensing light from the light source, and the condensing direction. And a plurality of prisms arranged side by side. If it does in this way, the condensing effect | action will be selectively given to the light from each light source by the prism of the shape extended along the direction orthogonal to the condensing direction which is a selective condensing part. And the prism which comprises a selective condensing part is extended over the full length of a planar optical member along the direction orthogonal to a condensing direction, and since it is arranged in multiple numbers along the condensing direction The light from each light source can be collected more efficiently, thereby making it possible to make the unevenness of the emitted light less likely to occur.

(10) A plurality of the light sources are arranged side by side in the chassis, and the optical member is a plurality of lens members that are arranged so as to individually cover the light sources from the light emitting unit side. In this way, a plurality of light sources arranged side by side in the chassis are distributed to the light from each light source by the lens member arranged in a form that individually covers from the light emitting unit side, and the light distribution distribution related to each light source is changed. By providing complementary optical actions so as to complement each other in the direction intersecting with the length direction of the light emitter, the light distribution relating to the light emitted from the light emitting portion can be made isotropic well.

  Next, in order to solve the above problem, a display device of the present invention includes the above-described illumination device and a display panel that performs display using light from the illumination device.

  According to such a display device, since the illumination device that supplies light to the display panel is less likely to cause uneven brightness in the emitted light, display with excellent display quality can be realized.

  An example of the display panel is a liquid crystal panel. Such a display device can be applied as a liquid crystal display device to various uses such as a display of a television or a personal computer, and is particularly suitable for a large screen.

  According to the present invention, luminance unevenness can be suppressed.

1 is an exploded perspective view showing a schematic configuration of a television receiver according to Embodiment 1 of the present invention. The exploded perspective view which shows schematic structure of the liquid crystal display device with which a television receiver is equipped The top view which shows the arrangement structure of the LED board in a chassis with which a liquid crystal display device is equipped, and a reflective sheet Sectional drawing which shows the cross-sectional structure along the short side direction of a liquid crystal display device Sectional drawing which shows the cross-sectional structure along the long side direction of a liquid crystal display device A plan view showing an arrangement configuration of LEDs arranged in a matrix Vii-vii sectional view of FIG. Viii-viii sectional view of FIG. Perspective view of shaped diffuser Plan view of shaped diffuser Graph showing light distribution of LED The graph which shows the luminance distribution which concerns on the emitted light from the part which makes concentric form with LED in a shaped diffuser plate Sectional drawing which shows the arrangement configuration of the prism sheet and LED which concern on Embodiment 2 of this invention. The top view of the lens member and LED which concern on Embodiment 3 of this invention. Cross section of lens member and LED The top view of the lens member and LED which concern on Embodiment 4 of this invention. Cross section of lens member and LED The top view of the lens member and LED which concern on Embodiment 5 of this invention. The graph which shows the luminance distribution which concerns on the emitted light from a lens member The perspective view of the shaping | molding diffusion plate which concerns on Embodiment 6 of this invention. Sectional drawing which shows arrangement configuration of shaped diffusion plate and LED The top view which shows the arrangement configuration of LED arranged in parallel in matrix form concerning Embodiment 7 of this invention Plan view of shaped diffuser Xxiv-xxiv cross-sectional view of Fig. 21 Xxv-xxv cross-sectional view of Fig. 21 The top view which shows the arrangement configuration of LED arranged in a matrix form according to Embodiment 8 of the present invention Xxvii-xxvii line cross-sectional view of FIG. Xxviii-xxviii line cross-sectional view of FIG. The top view which shows the arrangement configuration of LED arranged in matrix form concerning Embodiment 9 of this invention The top view which shows the arrangement configuration of LED and LED board which concern on Embodiment 10 of this invention.

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. In this embodiment, the liquid crystal display device 10 is illustrated. In addition, a part of each drawing shows an X axis, a Y axis, and a Z axis, and each axis direction is drawn to be a direction shown in each drawing. Moreover, let the upper side shown in FIG.4 and FIG.5 be a front side, and let the lower side of the figure be a back side.

  As shown in FIG. 1, the television receiver TV according to the present embodiment includes a liquid crystal display device 10, front and back cabinets Ca and Cb that are accommodated so as to sandwich the liquid crystal display device 10, a power source P, a tuner T, And a stand S. The liquid crystal display device (display device) 10 has a horizontally long (longitudinal) rectangular shape (rectangular shape) as a whole and is accommodated in a vertically placed state. As shown in FIG. 2, the liquid crystal display device 10 includes a liquid crystal panel 11 that is a display panel and a backlight device (illumination device) 12 that is an external light source, which are integrated by a frame-like bezel 13 or the like. Is supposed to be retained.

  Next, the liquid crystal panel 11 and the backlight device 12 constituting the liquid crystal display device 10 will be described sequentially. Among these, the liquid crystal panel (display panel) 11 has a horizontally long rectangular shape when seen in a plan view, and a pair of glass substrates are bonded together with a predetermined gap therebetween, and a liquid crystal is formed between both glass substrates. It is set as the enclosed structure. One glass substrate is provided with a switching element (for example, TFT) connected to a source wiring and a gate wiring orthogonal to each other, a pixel electrode connected to the switching element, an alignment film, and the like. The substrate is provided with a color filter and counter electrodes in which colored portions such as R (red), G (green), and B (blue) are arranged in a predetermined arrangement, and an alignment film. A polarizing plate is disposed on the outside of both substrates.

  Next, the backlight device 12 will be described in detail. As shown in FIG. 2, the backlight device 12 includes a substantially box-shaped chassis 14 having a light emitting portion 14 b that opens on the front side (light emitting side, liquid crystal panel 11 side), and a light emitting portion 14 b of the chassis 14. A planar optical member (optical member) 15 disposed so as to cover the frame and a frame 16 disposed along the outer edge portion of the chassis 14 and sandwiching the outer edge portion of the planar optical member 15 with the chassis 14. With. Further, in the chassis 14, an LED (Light Emitting Diode) 17 that is a light source, an LED substrate 18 on which the LED 17 is mounted, and the light in the chassis 14 on the front side (light emitting side, planar optical member 15). And a reflection sheet 19 to be reflected on the side). As described above, the backlight device 12 according to the present embodiment is a so-called direct type in which the LEDs 17 are arranged directly below the liquid crystal panel 11 and the planar optical member 15 in the chassis 14. Below, each component of the backlight apparatus 12 is demonstrated in detail.

  The chassis 14 is made of, for example, a metal plate such as an aluminum plate or an electrogalvanized steel plate (SECC). As shown in FIGS. 3 to 5, the chassis 14 has a horizontally long rectangular shape (rectangular shape, rectangular shape) like the liquid crystal panel 11. A bottom plate 14a, a side plate 14c rising from the outer end of each side (a pair of long sides and a pair of short sides) of the bottom plate 14a toward the front side (light emitting side), and outward from the rising end of each side plate 14c 14d, and is formed in a shallow box shape (substantially a dish shape) that opens toward the front side as a whole. The long side direction of the chassis 14 matches the X-axis direction, and the short side direction matches the Y-axis direction. The bottom plate 14 a in the chassis 14 is disposed on the back side of the LED substrate 18, that is, on the side opposite to the light emitting side of the LED 17. A frame 16 and a planar optical member 15 to be described below can be placed on each receiving plate 14d in the chassis 14 from the front side. A frame 16 is screwed to each receiving plate 14d.

  As shown in FIG. 2, the planar optical member 15 has a horizontally long rectangular shape when seen in a plane, like the liquid crystal panel 11 and the chassis 14. As shown in FIGS. 4 and 5, the planar optical member 15 has its outer edge portion placed on the receiving plate 14 d so as to cover the light emitting portion 14 b of the chassis 14 over the entire area, and in the liquid crystal panel 11 and the chassis 14. Between the LED 17 and the LED 17. The planar optical member 15 is opposed to the LED 17 at a predetermined interval on the front side, that is, on the light emitting side. The planar optical member 15 includes a shaped diffusion plate 15a disposed on the back side (the LED 17 side, opposite to the light emitting side), and an optical sheet 15b disposed on the front side (the liquid crystal panel 11 side, the light emitting side). Consists of The configuration of the shaped diffusion plate 15a will be described in detail later.

  The optical sheet 15b has a sheet shape that is thinner than the shaped diffusion plate 15a, and three optical sheets are laminated. Specifically, the optical sheet 15b includes a diffusion sheet 15b1, a prism sheet (lens sheet) 15b2, and a reflective polarizing sheet 15b3 in this order from the back side (shaped diffusion plate 15a side). The three sheets 15b1, 15b2, and 15b3 have substantially the same size when viewed in a plane. Among these, the diffusion sheet 15b1 arranged on the backmost side is made of a synthetic resin that is almost transparent (excellent in light transmission) and is provided with a large number of diffusion particles dispersed in a sheet-like light-transmitting substrate portion. And has a function of diffusing transmitted light. The prism sheet 15b2 disposed in the center in the stacking direction (Z-axis direction) is made of a substantially transparent synthetic resin and laminated on a sheet-like light-transmitting base material portion and a plate surface of the light-transmitting base material portion. It is comprised from the prism part (not shown) by which it is possible to give a condensing effect | action with respect to the transmitted light. The reflective polarizing sheet 15b3 arranged on the most front side (liquid crystal panel 11 side) has, for example, a multilayer structure in which layers having different refractive indexes are alternately stacked, and transmits p-waves of light from the LED 17. , S waves are reflected to the back side. Since the s wave returned to the back side is reflected to the front side by a reflection sheet 19 or the like to be described later, and separated into an s wave and a p wave, the s wave is used as outgoing light again toward the reflective polarizing sheet 15b3. Excellent in light utilization efficiency (luminance).

  As shown in FIG. 2, the frame 16 has a frame shape along the outer peripheral edge portions of the liquid crystal panel 11 and the planar optical member 15. An outer edge portion of the planar optical member 15 can be sandwiched between the frame 16 and each receiving plate 14d (FIGS. 4 and 5). The frame 16 can receive the outer edge portion of the liquid crystal panel 11 from the back side, and can sandwich the outer edge portion of the liquid crystal panel 11 with the bezel 13 disposed on the front side (FIGS. 4 and 5). ).

  Next, the LED 17 and the LED substrate 18 on which the LED 17 is mounted will be described. The LED 17 is surface-mounted on the LED substrate 18 and has a light emitting surface 17a facing a side opposite to the LED substrate 18 side, which is a so-called top surface emitting type, and its optical axis is in the Z-axis direction, that is, liquid crystal. This coincides with the direction orthogonal to the display surface of the panel 11 (the plate surface of the planar optical member 15). The detailed configuration of the LED 17 and its light distribution will be described in detail later. The “optical axis” referred to here is an axis that coincides with the traveling direction of the light having the highest light emission intensity (peaking) among the light emitted from the LED 17.

  As shown in FIGS. 3 to 5, the LED substrate 18 has a vertically long rectangular shape (rectangular shape, rectangular shape), the long side direction matches the Y-axis direction, and the short side direction is the X-axis direction. It is accommodated while extending along the bottom plate 14a in the chassis 14 in a matching state. The base material of the LED substrate 18 is made of the same metal as the chassis material such as the chassis 14, and a wiring pattern (not shown) made of a metal film such as a copper foil is formed on the surface thereof via an insulating layer. The outermost surface has a configuration in which a white reflective layer (not shown) is formed. In addition, as a material used for the base material of LED board 18, insulating materials, such as a ceramic, can also be used. The LED 17 having the above-described configuration is surface-mounted on the plate surface facing the front side (the plate surface facing the planar optical member 15 side) among the plate surfaces of the base material of the LED substrate 18. The surface 18a. The LEDs 17 are arranged in parallel in a matrix (matrix, grid) in the surface of the mounting surface 18a of the LED substrate 18, and are electrically connected to each other by a wiring pattern. Specifically, on the mounting surface 18a of the LED substrate 18, four pieces (even numbers) along the short side direction (X-axis direction) and twelve pieces along the long side direction (Y-axis direction) ( An even number of LEDs 17 are arranged in parallel in a matrix. The arrangement pitch of the LEDs 17 on the LED substrate 18 is substantially constant. Specifically, the LEDs 17 are arranged at substantially equal intervals in the X-axis direction (row direction) and the Y-axis direction (column direction).

  As shown in FIG. 3, the plurality of LED boards 18 having the above-described configuration are arranged in parallel along the X-axis direction in the chassis 14 with the long side direction and the short side direction aligned with each other. Specifically, five LED substrates 18 are arranged in the chassis 14 along the X-axis direction, and the arrangement direction thereof coincides with the X-axis direction. The arrangement pitch of the LED boards 18 arranged in the X-axis direction is substantially constant, and the arrangement pitch of the LEDs 17 arranged adjacent to each other in the X-axis direction in the adjacent LED boards 18 is adjacent to each LED board 18. Is set to be approximately the same as the arrangement pitch of the LEDs 17 in FIG. That is, in the surface of the bottom plate 14a of the chassis 14, it can be said that the LEDs 17 are arranged in parallel in a matrix form so as to be substantially equally spaced in the X-axis direction (row direction) and the Y-axis direction (column direction). Specifically, 20 LEDs 17 along the long side direction (X-axis direction) and 12 LEDs 17 along the short side direction (Y-axis direction) in the plane of the bottom plate 14a of the chassis 14 are arranged in a matrix. Are arranged in parallel. The planar optical members 15 arranged so as to cover the light emitting portion 14b of the chassis 14 are arranged in an opposing manner with respect to all of these LEDs 17 groups with a predetermined interval therebetween. Each LED board 18 is provided with a connector portion to which a wiring member (not shown) is connected, and driving power is supplied from an LED driving board (light source driving board) (not shown) via the wiring member. ing.

  The reflection sheet 19 is made of a synthetic resin, and the surface thereof is white with excellent light reflectivity. As shown in FIGS. 3 to 5, the reflection sheet 19 has a size that is laid over almost the entire inner surface of the chassis 14, so that the LED board 18 disposed in the chassis 14 is almost entirely on the front side. It is possible to cover from (light emitting side, planar optical member 15 side). The reflection sheet 19 can reflect the light in the chassis 14 toward the front side (light emission side, planar optical member 15 side). The reflection sheet 19 extends along the LED substrate 18 (bottom plate 14a) and rises from the outer ends of the bottom portion 19a to the front side with a bottom portion 19a having a size that covers each LED substrate 18 in a lump. It is composed of four rising portions 19b that are inclined with respect to the bottom portion 19a, and extending portions 19c that extend outward from the outer ends of the rising portions 19b and are placed on the receiving plate 14d of the chassis 14. . The bottom portion 19 a of the reflection sheet 19 is arranged so as to overlap the front side surface of each LED substrate 18, that is, the mounting surface 18 a of the LED 17. In addition, an LED insertion hole (light source insertion hole) 19 d through which each LED 17 is individually inserted is provided at the bottom portion 19 a of the reflection sheet 19 so as to overlap each LED 17 in plan view. A plurality of the LED insertion holes 19d are arranged in parallel in a matrix (matrix shape) in the X-axis direction and the Y-axis direction corresponding to the arrangement of the LEDs 17.

  Here, the detailed configuration of the LED 17 and the light distribution thereof will be described. As shown in FIGS. 7 and 8, the LED 17 is a sealing containing an LED element (LED chip, light emitting element) 20 that is a light source and a phosphor that emits light when excited by light from the LED element 20. It consists of a material (translucent resin material) 21 and a substrate portion 22 mounted in a state where the LED element 20 is sealed with the sealing material 21. In this LED 17, the sealing material 21 that seals the LED element 20 is formed in a substantially hemispherical shape (dome shape), and emitted light emitted from the light emitting surface 17 a that is a hemispherical surface of the sealing material 21 is radially formed. It has been spread. Hereinafter, the components of the LED 17 will be sequentially described in detail with reference to FIGS. 7 and 8. 7 and 8, the effective light emission range in the LED 17, that is, the diffusion angle range of the emitted light with which a certain luminance or higher is obtained, is indicated by a one-dot chain line.

  The LED element 20 is a semiconductor made of, for example, an InGaN-based material, and emits light when a voltage is applied in the forward direction. The LED element 20 exists in a blue wavelength region (about 420 nm to about 480 nm) in the main emission wavelength of the emitted light, and can be said to be a blue LED element that emits blue light in a single color. The main light emission wavelength of the LED element 20 is more preferably in the range of 440 nm to 460 nm, and specifically, for example, 451 nm.

  The sealing material 21 is made of a substantially transparent thermosetting resin material, specifically, an epoxy resin material, a silicone resin material, or the like. In the manufacturing process of the LED 17, the sealing material 21 is filled on the substrate portion 22 on which the LED element 20 is mounted, thereby sealing the LED element 20 and protecting it. The encapsulant 21 contains a phosphor described below in a dispersed manner, and functions as a dispersion medium (binder) for holding the phosphor.

  The phosphor emits light existing in a predetermined wavelength region by being excited by light (blue light) from the LED element 20, and in the LED 17 according to the present embodiment, emitted light (fluorescence) is used as the phosphor. ) In which the main emission wavelengths are different from each other (a first phosphor and a second phosphor described below) are used. Specifically, the first phosphor is a green phosphor that emits light having a main emission wavelength in a green wavelength region (about 500 nm to about 570 nm) by being excited by light from the LED element 20. The The second phosphor is a red phosphor that emits light having a main emission wavelength in a red wavelength region (about 600 nm to about 780 nm) by being excited by light from the LED element 20. Specifically, as the green phosphor (first phosphor), β-SiAlON, which is a kind of sialon-based phosphor, is preferably used, and as the red phosphor (second phosphor), cozun It is preferable to use casoon, which is a type of phosphor. Note that β-SiAlON has a main emission wavelength of the emitted light of, for example, about 540 nm, whereas Kasun has a main emission wavelength of the emitted light of, for example, about 650 nm.

  Therefore, the LED 17 includes blue light (blue component light) emitted from the LED element 20, green light (green component light) emitted from the green phosphor as the first phosphor, and the second phosphor. As a whole, white light can be emitted by red light (red component light) emitted from the red phosphor. According to such a configuration, if a phosphor that emits yellow light is used instead of a green phosphor and a red phosphor as a phosphor, green light and The emission intensity in red light can be increased, which is excellent in terms of color rendering in the emitted light. Since the chromaticity of the emitted light in the LED 17 changes according to the absolute value or relative value of the content in the green phosphor and the red phosphor, for example, the content of the green phosphor and the red phosphor is changed. It is possible to adjust the chromaticity of the emitted light in the LED 17 by appropriately adjusting.

  The substrate portion 22 is made of a ceramic material or a synthetic resin material (for example, a polyamide-based resin material) having a white surface with excellent light reflectivity. The board portion 22 has a plate shape parallel to the mounting surface 18 a of the LED board 18, and a plate surface opposite to the surface side on which the LED element 20 is mounted is attached to the mounting surface 18 a of the LED board 18. Yes. The substrate portion 22 has a substantially square shape when viewed in plan (see FIG. 6). On the substrate portion 22, a plurality of LED elements 20, specifically two, are arranged side by side with a predetermined interval. The two LED elements 20 are both arranged at positions (eccentric positions) deviated from the center of the plate surface of the substrate portion 22, and specifically, are arranged on a straight line passing through the center of the substrate portion 22 in a plan view. In addition, the arrangement is symmetrical with respect to the center of the substrate portion 22. As shown in FIG. 6, these two LED elements 20 have an elongated longitudinal shape along the arrangement direction of the LED elements 20 as a whole in a plan view, and constitute a longitudinal light emitter 23. It can be said. The length direction (Y-axis direction) of the light emitter 23 coincides with the arrangement direction of the two LED elements 20, and the direction orthogonal to the arrangement direction of the two LED elements 20 (X-axis direction) is the light emitter. 23 coincides with the width direction.

Next, the light distribution of the LED 17 will be described with reference to FIG. In FIG. 11, the horizontal axis is an angle (unit is “degree”) with respect to the optical axis (front direction) of the LED 17, and the vertical axis is emission intensity (arbitrary unit). Further, specific units of “luminescence intensity” can be, for example, radiance (W / sr · m ² ), radiant flux (W), irradiance (W / m ² ), and the like. It is also possible to use a physical quantity related to the radiation amount. Note that the solid line in FIG. 11 is a light distribution regarding a cross section obtained by cutting the LEDs 17 along the arrangement direction of the LED elements 20 (the length direction, the wide-angle direction, and the Y-axis direction of the light emitters 23). The broken line in 11 is the light distribution regarding the cross section which cut | disconnected LED17 along the direction (The width direction of the light-emitting body 23, a narrow angle direction, an X-axis direction) orthogonal to the row direction of the LED element 20. FIG. As shown in FIG. 11, the light distribution of the LEDs 17 has anisotropy due to the arrangement of the LED elements 20, in other words, the planar shape of the light emitter 23. That is, the light that travels along the direction in which the two LED elements 20 are aligned (the length direction of the light emitter 23) out of the light emitted from the LED 17 travels along the other direction as shown by the solid line in FIG. Compared to the light to be emitted, the effective light emission range, that is, the diffusion angle range of the emitted light that can obtain a certain level of brightness is the widest. The light traveling direction in which the effective light emission range (diffusion angle range) is the widest is the wide-angle direction, which coincides with the arrangement direction of the LED elements 20 (the length direction of the light emitter 23). The light distribution of the LEDs 17 is substantially symmetrical with respect to the wide angle direction. On the other hand, the light that travels along the direction orthogonal to the direction in which the two LED elements 20 are aligned (the width direction of the light emitter 23) out of the light emitted from the LED 17 is directed to other directions as shown by the broken line in FIG. Compared with the light traveling along, the effective light emission range, that is, the diffusion angle range of the emitted light with which a certain level of luminance is obtained is the narrowest. The traveling direction of light in which the effective light emission range (diffusion angle range) is the narrowest is the narrow angle direction, which coincides with the direction orthogonal to the arrangement direction of the LED elements 20 (the width direction of the light emitter 23). . The light distribution of the LED 17 is substantially symmetrical with respect to the narrow angle direction. The wide-angle direction and the narrow-angle direction in the light distribution of the LED 17 are orthogonal to each other.

  When the LED 17 having anisotropy in the light distribution as described above is used in the backlight device 12, in order to ensure the mountability of the LED 17, the posture in which the light distribution is uniform for all the LEDs 17, that is, the same mounting direction. Then, there is a concern that unevenness occurs in the luminance distribution related to the light emitted from the light emitting portion 14b of the chassis 14. In the present embodiment, as shown in FIG. 6, each LED 17 has the length direction of the light emitters 23 (alignment direction of the LED elements 20) coincides with the Y axis direction, and the width direction of the light emitters 23 is the X axis. It is mounted on the LED board 18 in a posture that matches the direction and is accommodated in the chassis 14. Therefore, in the present embodiment, as shown in FIG. 7, the light distribution from the LED 17 is supplemented to the light from the LED 17 by the planar optical member 15 arranged to cover the light emitting portion 14 b of the chassis 14. A complementary optical action is applied to emit light. Specifically, the shaped diffuser plate 15a of the planar optical member 15 has a width direction of the light emitter 23 among the light from the LED 17 (a narrow-angle direction in the light distribution, orthogonal to the arrangement direction of the LED elements 20). A prism portion (selective light collecting portion) 25 that selectively gives a light collecting action to light traveling in the direction in which the light is traveling. Hereinafter, a detailed configuration of the shaped diffusion plate 15a will be described.

  The shaped diffusing plate 15a is made of a synthetic resin material (for example, polycarbonate or acrylic) that is almost transparent and excellent in translucency, and diffuses light from the LED 17 as shown in FIGS. And a prism portion 25 that is formed on the surface of the light diffusing base material portion 24 and selectively condenses the light from the LED 17 in the width direction of the light emitter 23. Is done. The light diffusing base material portion 24 has a plate shape having a predetermined thickness, and has a structure in which a large number of diffusing particles capable of diffusing light are dispersed and blended therein. Since a large number of diffusion particles are randomly dispersed in the light diffusing substrate 24, the light from the LED 17 can be diffusely reflected substantially isotropically (non-directionally). Therefore, at the stage where the light from the LED 17 is transmitted through the light diffusing substrate 24, the light is diffused by the diffusing particles, but the anisotropy in the light distribution of the LED 17 still remains. .

  On the other hand, as shown in FIGS. 7 and 9, the prism portion 25 is formed on the surface of the light diffusing base material portion 24 on the front side (light emitting side, opposite to the surface facing the LED 17), The prism 26 extending along the length direction of the light emitter 23 in the LED 17 (the Y-axis direction, the arrangement direction of the LED elements 20, the wide-angle direction) is connected to the width direction of the light emitter 23 (X-axis direction, the arrangement of the LED elements 20). A large number of such elements are arranged in parallel along a direction perpendicular to the direction (a narrow-angle direction). The prism 26 has a mountain shape with a substantially triangular cross-section cut along the X-axis direction, and extends linearly along the Y-axis direction and extends over the entire length of the shaped diffusion plate 15a in the Y-axis direction. Consisting of the ridges. The prism 26 has a pair of inclined surfaces 26a inclined with respect to both the X-axis direction and the Z-axis direction, and the light from the LED 17 is reflected or refracted by these inclined surfaces 26a, thereby condensing the light. An action can be imparted. The apex angle in the prism 26, that is, the angle formed by the pair of inclined surfaces 26a is, for example, in the range of 90 to 110 degrees, and particularly preferably about 90 degrees. Specifically, when the light from the LED 17 reaches the inclined surface 26a of the prism 26, the light whose incident angle is less than the critical angle is inclined at the refraction angle derived from the incident angle and the refractive index of the shaped diffusion plate 15a. While the light is refracted by the surface 26a and emitted, the light whose incident angle exceeds the critical angle is totally reflected by the inclined surface 26a. Of these, the light refracted by the former inclined surface 26a is raised so as to travel in the front direction rather than the incident time, so that the light from the LED 17 can be condensed in the X-axis direction. Therefore, the condensing direction of the prism portion 25 in the shaped diffuser plate 15a is the width direction of the prism 26 (the direction orthogonal to the length direction of the prism 26, the arrangement direction of the plurality of prisms 26, the width direction of the light emitter 23, Narrow angle direction) On the other hand, in the Y-axis direction, since the light from the LED 17 is not collected by the prism unit 25, the non-condensing direction of the prism unit 25 is the length direction of the prism 26 (the plurality of prisms 26). It can be said that it coincides with the direction orthogonal to the arrangement direction, the length direction of the light emitters 23, and the wide-angle direction). Incidentally, the light totally reflected by the inclined surface 26a is returned to the back side, diffused and reflected by the light diffusing base material portion 24, etc., and again headed toward the inclined surface 26a of the prism 26, thereby being inclined. The light is emitted to the outside while being refracted by the surface 26a. That is, in this shaped diffuser plate 15a, the luminance of the emitted light can be made higher by totally reflecting a part of the light from the LED 17 and reusing it.

Next, the luminance distribution (light distribution) related to the light emitted from the portion of the shaped diffuser plate 15a concentric with the LED 17 will be described with reference to FIG. In FIG. 12, the angle (unit is “degree”) with respect to the front direction (the direction from the shaped diffusion plate 15 a to the front side along the Z-axis direction) in the portion where the horizontal axis is concentric with the LED 17 of the shaped diffusion plate 15 a. The vertical axis represents the emission intensity (arbitrary unit). Further, specific units of “luminescence intensity” can be, for example, radiance (W / sr · m ² ), radiant flux (W), irradiance (W / m ² ), and the like. It is also possible to use a physical quantity related to the radiation amount. Note that the solid line in FIG. 12 is a luminance distribution with respect to a cross section obtained by cutting the shaped diffuser plate 15a along the X-axis direction (the width direction and the narrow angle direction of the light emitter 23), whereas the two-dot chain line in FIG. These are the luminance distribution regarding the cross section which cut | disconnected the diffusion plate of the structure (structure which consists only of a light-transmissive base material part) which does not have the prism part 25 which is a comparative example along the X-axis direction. The luminance distribution in the condensing direction (X-axis direction) of the emitted light from the portion concentric with the LED 17 in the shaped diffusion plate 15a is the horizontal direction (angle: ± 90) as shown by the solid line in FIG. In a predetermined angle range from (degree), the luminance (emission intensity) of the emitted light is lower than that of the comparative example indicated by the two-dot chain line because the emitted light is raised in the front direction by the prism unit 25. On the other hand, in the predetermined angle range from the front direction (angle: 0 degree), the brightness of the emitted light is improved as compared with the comparative example due to the condensing action of the prism portion 25. Therefore, for example, when the luminance reference value is taken between the intersection of the solid line and the two-dot chain line and the peak point of the comparative example (two-dot chain line), the angle range in which the luminance exceeding this reference luminance value is obtained is The shape diffusion plate 15a is wider than the diffusion plate of the comparative example. In other words, it can be said that the shaped light diffusing plate 15 a has an extended light output angle range in which a certain level of brightness or more is obtained in the light collecting direction (X-axis direction) by the light collecting action of the prism portion 25. The ratio of the peak luminance value of the shaped diffusion plate 15a to the peak luminance value of the diffusion plate of the comparative example is, for example, about 1.1 to 1.2. Also, the luminance distribution related to the light traveling along the Y-axis direction (non-condensing direction) that is not subjected to the condensing action by the prism portion 25 among the emitted light from the shaped diffusion plate 15a is shown by a two-dot chain line in FIG. The brightness distribution shown in FIG.

  This embodiment has the structure as described above, and the operation thereof will be described subsequently. When each LED 17 of the backlight device 12 is turned on when the liquid crystal display device 10 is used, the light emitted from each LED 17 is directly applied to the planar optical member 15 as shown in FIGS. Alternatively, after being reflected by the reflection sheet 19 or the like, it is incident indirectly, passes through the planar optical member 15, and then exits toward the liquid crystal panel 11.

  Here, the LEDs 17 arranged in a matrix in the chassis 14 have anisotropy in the light distribution due to the arrangement of the LED elements 20, and the effective light emission range in the emitted light, that is, a certain luminance or more. Is widest in the wide-angle direction, but gradually becomes narrower as it approaches the narrow-angle direction and narrowest in the narrow-angle direction (see FIG. 11). For this reason, if a normal diffusing plate having no prism portion 25 is used as the planar optical member 15, the luminance distribution of the light emitted from the diffusing plate reflects the light distribution of each LED 17 as it is. Specifically, although the light emission angle range is sufficiently wide in the wide angle direction in the light distribution of the LED 17, the light emission angle range is narrow in the narrow angle direction, and as a result, the light emission angle range of the emitted light is reduced. There is a concern that unevenness occurs and it is visually recognized as luminance unevenness. In this regard, in this embodiment, as shown in FIG. 7, the planar optical member 15 includes a shaped diffusion plate 15a having a prism portion 25, and the shaped diffusion plate 15a distributes the LED 17 to the light from the LED 17. A complementary optical action is applied so as to complement the light distribution in the direction intersecting the length direction of the light emitter 23. As a result, the luminance distribution (light distribution) relating to the light emitted from the light emitting portion 14b of the chassis 14 is made isotropic, so that unevenness in luminance is less likely to occur in the emitted light.

  More specifically, as shown in FIG. 7 and FIG. 8, the light incident on the shaped diffusing plate 15 a from the LED 17 is first a large number of diffusing particles randomly dispersed and blended in the light diffusing substrate portion 24. Is diffusely reflected substantially isotropically. Therefore, at the stage where light is transmitted through the light diffusing substrate 24, the diffusion of light is achieved by the diffusing particles, but the anisotropy in the light distribution of the LED 17 still remains. The light that has entered the prism portion 25 from the light diffusing substrate portion 24 is refracted or reflected by striking the inclined surface 26 a of each prism 26. Here, as shown in FIGS. 9 and 10, each prism 26 extends along the Y-axis direction, has a length over the entire length of the shaped diffusion plate 15 a, and a large number along the X-axis direction. Since the cross-sectional shape cut along the X-axis direction is a triangle, the light refracted by the inclined surface 26a is condensed in the X-axis direction as shown in FIG. , It is launched so that it proceeds in the front direction from the time of incidence. Then, the outgoing light emitted to the front side while being condensed by the prism unit 25 has an extended light output angle range in which the brightness of a certain level or more is obtained in the light collecting direction (X-axis direction) (see the solid line in FIG. 12). reference). The condensing direction of the shaped diffusion plate 15a coincides (parallel) with the narrow angle direction in which the diffusion angle range of the emitted light is relatively narrow in the light distribution of the LED 17, so that the light from the LED 17 is shaped. By providing the light condensing action by the diffusion plate 15a, the brightness (light emission intensity) of the light toward the narrow angle direction which tends to be insufficient in the light distribution of the LED 17 is compensated, and the light emission angle range which tends to be narrowed. Expansion is planned.

  On the other hand, among the light emitted from the shaped diffusion plate 15a, as shown in FIG. 8, the non-condensing direction of the shaped diffusion plate 15a is the Y-axis direction, that is, the arrangement of the LEDs 17 as shown in FIG. In the light distribution, the diffusion angle range of the emitted light coincides with (in parallel with) the relatively wide wide-angle direction, so that the light condensing action by the prism portion 25 is hardly imparted, and the luminance distribution of the LED 17 in the wide-angle direction is The light distribution is reflected almost as it is. As described above, the light traveling in the X-axis direction (the width direction of the light emitter 23 and the narrow-angle direction in the light distribution of the LEDs 17) in the light emitted from the shaped diffuser 15a is as shown in FIG. In addition, since the diffusion angle range is expanded by the shaped diffusion plate 15a, the light travels in the Y-axis direction (the length direction of the light emitter 23, the wide-angle direction in the light distribution of the LEDs 17). The difference in the range of diffusion angles that can occur is mitigated, thereby making the emitted light isotropic. As described above, the light distribution having anisotropy in each LED 17 is complemented, and luminance unevenness hardly occurs in the light emitted from the shaped diffusion plate 15a. In addition, the light totally reflected by the inclined surface 26a of the prism 26 and returned to the back side is reflected again toward the front side by the light diffusing base member 24 and the like, and is used as outgoing light. The brightness of the incident light can be further improved. In addition, the shaped diffuser plate 15a is arranged so as to cover the light emitting portion 14b of the chassis 14, and condenses all the light from all the LEDs 17 accommodated in the chassis 14 in a lump. Since the light distribution in the LEDs 17 is complemented collectively, the cost can be reduced as compared with the case where an optical member is individually installed for each LED 17.

  As described above, the backlight device (illumination device) 12 of the present embodiment includes the chassis 14 having the light emitting portion 14b that emits light, and the light emitting body 23 that is housed in the chassis 14 and has a longitudinal shape. The LED (light source) 17 has anisotropy in the light distribution of the light emitted toward the light emitting portion 14b, and is arranged on the light emitting portion 14b side with respect to the LED 17, and the light from the LED 17 is transmitted to the LED 17 And a shaped diffuser plate 15a, which is an optical member that emits light by applying a complementary optical action so as to complement the light distribution in the direction intersecting the length direction of the light emitter 23.

  In this way, the light emitted from the LED 17 accommodated in the chassis 14 is given a predetermined optical action by the shaped diffusion plate 15a, which is an optical member, and then the light is emitted from the light emitting portion 14b of the chassis 14 to the outside. Is emitted. Since the LED 17 has the light emitting body 23 having a longitudinal shape, the light distribution has anisotropy, and the light emission intensity tends to be insufficient in the direction intersecting the length direction of the light emitting body 23. It has become. On the other hand, the light emitted from the LED 17 has a complementary optical action so as to complement the light distribution of the LED 17 in the direction intersecting the length direction of the light emitter 23 by the shaped diffusion plate 15a which is an optical member. Therefore, the light distribution according to the light emitted from the light emitting portion 14b can be made isotropic. Thereby, it is possible to make it difficult for luminance unevenness to occur in the emitted light.

  The shaped diffuser plate 15a, which is an optical member, includes a prism portion (selective light concentrating portion) 25 that selectively condenses light from the LED 17 in a direction intersecting the length direction of the light emitter 23. Have. In this way, the light emitted from the LED 17 is selectively collected by the prism portion 25 included in the shaped diffuser plate 15a, which is an optical member, in the direction that intersects the length direction of the light emitter 23. The light is emitted after being applied. Of the light emitted from the shaped diffuser plate 15a, which is an optical member, the light traveling in the direction intersecting the length direction of the light emitter 23 is given a condensing action and has a certain luminance or higher. The emitted light range is extended. Thereby, a certain level or more of luminance can be obtained by the light emitted from the shaped diffusion plate 15a, which is an optical member, and the light traveling in the length direction of the light emitter 23 and the light traveling in the direction intersecting the length direction. A difference in the light emission range is less likely to occur, and the emitted light is made isotropic.

  The prism portion 25 includes a prism 26 that has a shape extending along the length direction of the light emitter 23 and a plurality of prisms 25 arranged side by side along a direction orthogonal to the length direction of the light emitter 23. If it does in this way, the prism of the shape which extends along the length direction of the light emission body 23 which is the prism part 25 to the light which goes to the length direction of the light emission body 23 among the lights from LED17. The light collecting action is selectively given by 26. Since a plurality of prisms 26 constituting the prism portion 25 are arranged along the direction orthogonal to the length direction of the light emitter 23, the light from the LED 17 can be collected more efficiently. Thus, luminance unevenness can be made less likely to occur in the emitted light.

  The light emitter 23 is composed of a plurality of LED elements (light emitting elements) 20 arranged along the length direction thereof, and the prism portion 25 is selective in the direction intersecting the arrangement direction of the LED elements 20 with the light from the LED 17. Is provided with a light collecting action. In this way, since the light emitter 23 is composed of a plurality of LED elements 20, the luminous efficiency is increased and the heat radiation design is facilitated. Of the light emitted from the LED 17, the light that travels in the direction intersecting the direction in which the LED elements 20 are arranged is selectively focused by the prism portion 25 of the shaped diffusion plate 15 a that is an optical member. Emitted. Of the emitted light from the shaped diffuser plate 15a, which is an optical member, the light that travels in the direction intersecting with the direction in which the LED elements 20 are arranged has a certain level of brightness as the condensing action is applied. The light emission range has been expanded. As a result, a certain luminance or more is obtained by the light emitted from the shaped diffuser plate 15a, which is an optical member, and the light directed in the direction in which the LED elements 20 are arranged and the light directed in the direction intersecting the arrangement direction of the LED elements 20. Therefore, it is difficult for a difference in the light output range to be generated, so that the emitted light is made isotropic.

  The chassis 14 has a bottom plate 14a disposed on the side opposite to the light emitting portion 14b, and the LEDs 17 are arranged side by side in a posture in which a plurality of light distributions are aligned with each other on the surface of the bottom plate 14a. Has been. In this way, since the plurality of LEDs 17 arranged side by side in the plate surface of the bottom plate 14a have a posture in which the light distribution distribution is aligned with each other, compared to a case where LEDs having different postures are included. The cost for installing the LED 17 can be reduced. Further, even if the plurality of LEDs 17 are arranged in a posture in which the light distributions are aligned with each other, the light distribution from the LEDs 17 is transmitted to the light emitted from the LEDs 17 by the shaped diffuser plate 15a that is an optical member. Since a complementary optical action is provided so as to complement the direction intersecting the length direction of 23, the emitted light from the light emitted light is preferably isotropic.

  The chassis 14 has a bottom plate 14a disposed on the side opposite to the light emitting portion 14b, and the plurality of LEDs 17 are mounted in a posture in which the light distribution is aligned with each other and extend along the bottom plate 14a. The LED board (light source board) 18 arranged in the form is provided. In this way, since the plurality of LEDs 17 mounted on the LED board 18 have a posture in which the light distributions are aligned with each other, compared to the case where the LEDs 17 having different postures are included, Such manufacturing costs can be reduced. Further, even if the plurality of LEDs 17 are arranged in a posture in which the light distributions are aligned with each other, the light distribution from the LEDs 17 is transmitted to the light emitted from the LEDs 17 by the shaped diffuser plate 15a that is an optical member. Since a complementary optical action is provided so as to complement the direction intersecting the length direction of 23, the emitted light from the light emitted light is preferably isotropic.

  A plurality of LEDs 17 are arranged side by side in the chassis 14, and the shaped diffusion plate 15 a that is an optical member is a planar optical member 15 that is arranged so as to cover the light emitting portion 14 b. In this way, the light emitted from the plurality of LEDs 17 arranged side by side in the chassis 14 toward the light emitting portion 14b is caused by the planar optical member 15 arranged so as to cover the light emitting portion 14b. By providing a complementary optical action so as to complement the light distribution distribution related to each LED 17 in the direction intersecting the length direction of the light emitter 23, the light distribution distribution related to the light emitted from the light emitting portion 14b is excellent. Can be made isotropic. Since the optical action can be imparted to the light from the plurality of LEDs 17 in the chassis 14 by the planar optical member 15, the cost can be reduced as compared with the case where an optical member is individually installed for each LED 17. it can.

  Further, the planar optical member 15 is formed on the surface of the light diffusing base material portion 24 for diffusing the light from the LED 17 and the light diffusing base material portion 24, and the length of the light emitting body 23 to the light from the LED 17 And a prism portion 25 that selectively imparts a light condensing function in a direction intersecting the direction. In this way, the light from the LED 17 is diffused by the light diffusing substrate portion 24 of the planar optical member 15 and the light from the LED 17 is intersected by the prism portion 25 with the length direction of the light emitter 23. By selectively condensing, the light from the LED 17 is given a complementary optical action to complement the light distribution relating to the LED 17.

  The prism portion 25 extends over the entire length of the planar optical member 15 along a direction orthogonal to the light collecting direction, which is a direction for collecting light from the LED 17, and a plurality of prism portions 25 are arranged along the light collecting direction. It consists of the prism 26 arranged by. If it does in this way, the condensing effect | action will be selectively given to the light from each LED17 by the prism 26 of the shape which extends along the direction orthogonal to the condensing direction which is the prism part 25. FIG. And the prism 26 which comprises the prism part 25 extends over the full length of the planar optical member 15 along the direction orthogonal to a condensing direction, and since several are arranged along with the condensing direction. The light from each LED 17 can be collected more efficiently, thereby making it possible to make it more difficult to produce uneven brightness in the emitted light.

<Embodiment 2>
A second embodiment of the present invention will be described with reference to FIG. In this Embodiment 2, the thing which complemented the light distribution of LED117 using the prism sheet 115b2 among the planar optical members 115 is shown. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

  As shown in FIG. 13, the planar optical member 115 according to the present embodiment includes a diffusion plate 27 that does not have a prism portion, instead of the shaped diffusion plate 15 a described in the first embodiment. Yes. Since the diffusing plate 27 has only the light diffusing substrate portion 124, the anisotropy in the light distribution of the LED 117 remains in the emitted light obtained by transmitting the light from the LED 117. . On the other hand, the prism sheet 115b2 constituting the optical sheet 115b of the planar optical member 115 complements the light from the LED 117 so as to complement the light distribution of the LED 117 in the direction intersecting the length direction of the light emitter 123. It is supposed to give a typical optical action.

  The prism sheet 115b2 is made of a synthetic resin material (e.g., polycarbonate or acrylic) that is substantially transparent and excellent in translucency, and includes a light-transmitting base material portion 28 that transmits light from the LED 117, and a light-transmitting base material portion 28. The prism portion 29 is formed on the surface and selectively condenses the light from the LED 117 in the width direction of the light emitter 123. The light-transmitting base material portion 28 of the prism sheet 115b2 is thinner than the diffusion plate 27 and does not contain diffusing particles, so that the light diffusing base of the shaped diffusion plate 15a described in the first embodiment is used. The material portion 24 is different in configuration. The prism portion 29 of the prism sheet 115b2 has the same structure as the prism portion 25 of the shaped diffusion plate 15a described in the first embodiment, and has the same light collecting action, that is, the X-axis direction (the light emitter 123). By emitting the light from the LED 117 while condensing it in the width direction), it is possible to extend the light output angle range related to the emitted light in the X-axis direction.

  As described above, according to the present embodiment, the prism sheet 115b2 that is the planar optical member 115 is provided on the surface of the light transmissive substrate portion 28 that transmits the light from the LED 117 and the light transmissive substrate portion 28. The prism portion 29 is formed and selectively condenses the light from the LED 117 in the direction intersecting the length direction of the light emitter 123. In this way, the light from the LED 117 is transmitted by the light-transmitting base material portion 28 of the prism sheet 115 b 2 that is the planar optical member 115, and the light from the LED 117 is transmitted by the prism portion 29 to the length of the light emitter 123. By selectively condensing in the direction intersecting the direction, the light from the LED 117 is given a complementary optical action so as to complement the light distribution relating to the LED 117.

<Embodiment 3>
Embodiment 3 of the present invention will be described with reference to FIG. 14 or FIG. In this Embodiment 3, what installed the lens member 30 which covers LED217 individually is shown. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

  As shown in FIGS. 14 and 15, the LED substrate 218 according to the present embodiment is attached with a lens member 30 that imparts a diffusing action to the light emitted from the LED 217 and emits the light. The lens member 30 is made of a synthetic resin material (for example, polycarbonate or acrylic) that is substantially transparent (having high translucency) and has a refractive index higher than that of air. The lens member 30 has a predetermined thickness and is formed in a substantially perfect circle shape when seen in a plan view. The lens member 30 covers each LED 217 individually from the front side with respect to the LED substrate 218, that is, when viewed from the plan view, with each LED 217. Each is attached to overlap. The lens member 30 faces the back side, and the surface facing the LED substrate 218 (LED 217) is a light incident surface 30a on which light from the LED 217 is incident, while facing the front side and facing the planar optical member 215. The surface to be used is a light emitting surface 30b that emits light. Among these, although the light incident surface 30a is parallel to the plate surface of the LED substrate 218 as a whole, the light incident side concave portion 30c having a substantially conical shape with a reverse V-shaped cross section is formed in a region overlapping with the LED 217 when viewed in plan. The light from the LED 217 can be refracted at a wide angle by the inclined surface of the light incident side recess 30c. On the other hand, the light emitting surface 30b is formed in a flat and substantially spherical shape, and thereby, the emitted light can be emitted while being refracted at a wide angle. As described above, the lens member 30 can emit light having strong directivity emitted from the LED 217 while diffusing, and can be said to be a diffusion lens. The lens member 30 is disposed at a position that is substantially concentric with the LED 217 when viewed in plan. In such a configuration, even if anisotropy occurs in the light distribution of the light emitted from the lens member 30, the light distribution of each LED 217 can be complemented by the light collecting action by the shaped diffusion plate 215a. .

<Embodiment 4>
A fourth embodiment of the present invention will be described with reference to FIG. 16 or FIG. In this Embodiment 4, what changed the structure of the lens member 330 described in Embodiment 3 mentioned above is shown. In addition, the overlapping description about the same structure, effect | action, and effect as above-mentioned Embodiment 3 is abbreviate | omitted.

  As shown in FIGS. 16 and 17, the lens member (optical member) 330 according to the present embodiment has a prism portion (selective condensing portion) 31 formed on the light exit surface 330 b. The prism portion 31 is formed by replacing the prism 32 extending along the length direction (Y-axis direction, LED element 320 arrangement direction, wide-angle direction) of the light emitter 323 in the LED 317 with the width direction (X axis direction) of the light emitter 323. A large number of LED elements 320 are arranged in parallel along a direction perpendicular to the direction in which the LED elements 320 are arranged (a narrow-angle direction). The prism 32 has a mountain shape with a substantially triangular cross-section cut along the X-axis direction, and extends linearly along the Y-axis direction and crosses the lens member 330 over the entire region in the Y-axis direction. Consists of articles. The prism 32 has a pair of inclined surfaces 32a inclined with respect to both the X-axis direction and the Z-axis direction, and the light from the LED 317 is reflected or refracted by the inclined surfaces 32a. It is possible to selectively impart a light condensing action in the X-axis direction. Thus, it can be said that the lens member 330 according to the present embodiment is a condensing lens that condenses and emits the light from the LED 317, and each LED 317 is arranged by the lens member 330 that is individually installed for each LED 317. The light distribution can be complemented individually. The planar optical member 315 according to the present embodiment includes a diffusion plate 327 that does not have a prism portion, instead of the shaped diffusion plate 15a described in the first embodiment. Since the configuration of the diffusion plate 327 is the same as that of the diffusion plate 27 described in the second embodiment, a duplicate description is omitted.

  As described above, according to the present embodiment, a plurality of LEDs 317 are arranged side by side in the chassis 314, and the optical member is a plurality of lenses arranged in such a manner as to individually cover the LEDs 317 from the light emitting unit side. The member 330 is used. In this way, the light distribution from each LED 317 is applied to the light from each LED 317 by the lens member 330 that is arranged so as to individually cover the plurality of LEDs 317 arranged in the chassis 314 from the light emitting unit side. By providing a complementary optical action so as to complement the distribution in the direction intersecting with the length direction of the light emitter 323, the light distribution distribution related to the light emitted from the light emitting portion can be satisfactorily made isotropic. Can do.

<Embodiment 5>
A fifth embodiment of the present invention will be described with reference to FIG. 18 or FIG. In the fifth embodiment, the structure of the lens member 430 is changed from the third embodiment. In addition, the overlapping description about the same structure, effect | action, and effect as above-mentioned Embodiment 3 is abbreviate | omitted.

  As shown in FIG. 18, the lens member 430 according to the present embodiment has a substantially elliptical shape that is horizontally long when viewed in plan. Specifically, the lens member 430 having a substantially elliptical shape has a major axis direction that coincides with the X-axis direction, that is, the width direction of the light emitter 423 in the LED 417 (the direction orthogonal to the arrangement direction of the LED elements 420, the narrow-angle direction). The short axis direction is attached to the LED substrate in a posture that coincides with the Y axis direction, that is, the length direction of the light emitter 423 in the LED 417 (the arrangement direction of the LED elements 320, the wide angle direction). The lens member 430 is a kind of a diffusing lens that diffuses and emits the light from the LED 417, and the luminance distribution related to the emitted light has anisotropy corresponding to the planar shape. That is, the lens member 430 emits the light amount (luminance, light emission intensity) emitted from the light emitting surface 430b in the long axis direction (X-axis direction) toward the short axis direction (Y-axis direction). It is relatively more than the amount of light. This is because the lens member 430 has a substantially elliptical shape, so that the area of the light emitting surface 430b that contributes to emitting light toward the long axis direction emits light toward the short axis direction. This is due to the fact that it is relatively wider than the area of the portion contributing to. Therefore, in this lens member 430, the light emission angle range of the emitted light differs depending on the traveling direction of the light, the wide angle direction having a relatively wide light emission angle range coincides with the major axis direction (X-axis direction), and relatively The narrow angle direction where the light emission angle range is narrow coincides with the minor axis direction (Y axis direction).

The luminance distribution relating to the light emitted from the lens member 430 is as shown in FIG. In FIG. 19, the horizontal axis represents the angle (unit: “degree”) with respect to the front direction of the lens member 430, and the vertical axis represents the emission intensity (arbitrary unit). Further, specific units of “luminescence intensity” can be, for example, radiance (W / sr · m ² ), radiant flux (W), irradiance (W / m ² ), and the like. It is also possible to use a physical quantity related to the radiation amount. Note that the solid line in FIG. 19 is a luminance distribution related to a cross section obtained by cutting the lens member 430 along the X-axis direction (the width direction and the narrow angle direction of the light emitter 423), whereas the two-dot chain line in FIG. It is a luminance distribution regarding the cross section which cut | disconnected along the X-axis direction the lens member (equivalent to the lens member 30 described in Embodiment 3 mentioned above) made into a perfect circle shape seeing the plane which is a comparative example. As shown in FIG. 19, among the light emitted from the lens member 430, light traveling in the X-axis direction is diffused at a wider angle than light traveling in the Y-axis direction and contributes to the light output. Since the area of 430b is larger, the luminance is improved over the entire area from the horizontal direction (± 90 degrees) to the front direction (0 degrees). Therefore, the angle range in which a certain level of luminance can be obtained is wider for the lens member 430 than for the lens member of the comparative example. That is, it can be said that the lens member 430 has an extended light output angle range in which a certain level of luminance is obtained in the wide-angle direction (X-axis direction) due to its diffusing action. Also, the luminance distribution relating to the light traveling from the lens member 430 along the narrow-angle direction (Y-axis direction) is substantially the same as the luminance distribution indicated by the two-dot chain line in FIG.

  As described above, in the lens member 430 having anisotropy in the luminance distribution related to the emitted light, the wide-angle direction in the luminance distribution is a narrow-angle direction in the light distribution of the LED 417 (the width direction of the light emitter 423, the LED element 420). The narrow-angle direction in the luminance distribution of the lens member 430 matches the wide-angle direction (the length direction of the light emitter 423, the arrangement direction of the LED elements 420) in the light distribution of the LED 417. It is attached to the LED board in a posture. Therefore, among the light emitted from the LED 417, the light traveling toward the narrow angle direction in the light distribution is diffused to the wide angle by the lens member 430, so that the light emission angle range that tends to be narrowed is expanded. Therefore, the difference in the light output angle range that can occur with the light traveling in the wide angle direction in the light distribution of the LED 417 is alleviated, thereby making the emitted light isotropic and reducing the luminance unevenness. Thus, the lens member 430 has a selective light diffusing structure that selectively imparts a light diffusing action to the light from the LED 417 in a direction orthogonal to (crossing) the length direction of the light emitter 423. I can say that. Further, in the present embodiment, the light distribution of each LED 417 can be individually supplemented by the lens member 430 provided for each LED 417 individually.

<Embodiment 6>
A sixth embodiment of the present invention will be described with reference to FIG. 20 or FIG. In the sixth embodiment, a cylindrical lens portion 33 is provided as a condensing structure on the shaped diffusion plate 515a. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

  As shown in FIGS. 20 and 21, the shaped diffuser plate 515 a according to the present embodiment is provided with a cylindrical lens unit (selective condensing unit) 33 including a plurality of convex cylindrical lenses 34. Yes. That is, the shaped diffusion plate 515a is a so-called lenticular lens sheet. A plurality of cylindrical lenses 34 constituting the cylindrical lens portion 33 extend along the Y-axis direction and extend along the X-axis direction on the front plate surface of the light-diffusing base material portion 524 of the shaped diffusion plate 515a. Are arranged in parallel. The cylindrical lens 34 has a mountain shape whose cross-sectional shape cut along the X-axis direction has a substantially semicircular shape (a bowl shape), and extends linearly along the Y-axis direction, and is shaped in the Y-axis direction. The diffusion plate 515a has a length over the entire length. Even when such a cylindrical lens 34 is used, the same light collecting action as in the first embodiment can be obtained.

<Embodiment 7>
A seventh embodiment of the present invention will be described with reference to FIGS. In this Embodiment 7, what changed the attitude | position of LED617 and the shaping | molding diffusion plate 615a is shown. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

  As shown in FIGS. 22, 24, and 25, the LED 617 according to the present embodiment has the length direction of the light emitter 623 (the arrangement direction of the LED elements 620) coincident with the X-axis direction, as shown in FIGS. It is mounted on the LED board 618 in a posture in which the width direction of 623 coincides with the Y-axis direction and is accommodated in the chassis 614. Therefore, the wide-angle direction in the light distribution of the LED 617 according to this embodiment matches the X-axis direction, and the narrow-angle direction matches the Y-axis direction. On the other hand, as shown in FIGS. 23 to 25, the shaped diffuser plate 615a includes a plurality of prisms 626 that constitute the prism portion 625 extending along the X-axis direction, and a large number of them are arranged in parallel along the Y-axis direction. Has been placed. Therefore, in the shaped diffuser plate 615a according to the present embodiment, the light condensing direction for condensing the light from the LED 617 coincides with the Y axis direction, and the non-condensing direction in which the light from the LED 617 is hardly collected is the X axis direction. Is consistent with As described above, the LED 617 and the shaped diffuser plate 615a according to the present embodiment are rotated by 90 degrees as viewed in a plane from those described in the first embodiment. Is the same as in the first embodiment.

<Eighth embodiment>
An eighth embodiment of the present invention will be described with reference to FIGS. In this Embodiment 8, what changed the LED element 720 in LED717 is shown. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

  As shown in FIGS. 26 to 28, the LED 717 according to the present embodiment has one LED element 720 (light emitter 723) having an elongated rectangular shape when viewed in plan. The LED 717 having such an LED element 720 as the light emitter 723 has anisotropy in its light distribution, and the wide-angle direction with the widest effective light emission range (diffusion angle range) is the length direction of the LED element 720. , And the narrow-angle direction with the narrowest effective light emission range coincides with the width direction of the LED element 720. The light distribution of the LED 717 is substantially the same as that of the LED 17 described in the first embodiment (see FIG. 11). The LED 717 is mounted on the LED substrate 718 and accommodated in the chassis 714 so that the length direction of the LED element 720 matches the Y-axis direction and the width direction of the LED element 720 matches the X-axis direction. . Even when the LED 717 having such a configuration is used, the light distribution distribution of each LED 717 can be complemented by condensing the light from each LED 717 by the shaped diffusion plate 715a.

<Ninth Embodiment>
A ninth embodiment of the present invention will be described with reference to FIG. In the ninth embodiment, the LED element 820 in the LED 817 is changed. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

  The LED 817 according to this embodiment includes three LED elements 820 as shown in FIG. The three LED elements 820 are arranged at the center position of the LED 817 and both side positions sandwiching the one arranged at the center position, and all the LED elements 820 are arranged on a straight line passing through the center of the LED 817 and are symmetric with respect to the same center. It is arranged like a shape. These three LED elements 820 are all made of the same member, and all are blue light emitting types. The light emitter 823 including the three LED elements 820 has a long and narrow shape along the Y-axis direction as a whole. The LED 817 having such an LED element 820 as the light emitter 823 has anisotropy in its light distribution, and the wide-angle direction with the widest effective light emission range (diffusion angle range) is an array of three LED elements 820. The narrow-angle direction where the effective light emission range is the narrowest coincides with the direction orthogonal to the arrangement direction of the three LED elements 820. The light distribution of the LED 817 is substantially the same as that of the LED 17 described in the first embodiment (see FIG. 11).

<Embodiment 10>
A tenth embodiment of the present invention will be described with reference to FIG. In this Embodiment 10, what changed the LED board 918 is shown. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

  As shown in FIG. 30, the LED substrate 918 according to the present embodiment has a horizontally long rectangular shape (strip shape) in a plan view, and LEDs 917 are arranged in a straight line along the length direction. It is said. In the chassis 914, a plurality of LED substrates 918 are arranged in parallel in a state where the length direction and the width direction are aligned with each other in the X-axis direction and the Y-axis direction. That is, the LED substrates 918 are arranged in a matrix in the chassis 914 with the X-axis direction as the row direction and the Y-axis direction as the column direction. Specifically, a total of 27 LED substrates 918 are arranged in a matrix in the chassis 914, three in the X-axis direction (row direction) and nine in the Y-axis direction (column direction). ing. In the present embodiment, the drive power is supplied to each LED board 918 by electrically connecting the LED boards 918 adjacent to each other in the X-axis direction by the connector 35.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In each of the above-described embodiments, the length direction of the light emitter of the LED matches the non-condensing direction of the shaped diffuser (in the fifth embodiment, the narrow-angle direction of the luminance distribution related to the lens member), and the LED Although the relationship between the width direction of the light emitter and the light condensing direction of the shaped diffuser plate (in the fifth embodiment, the wide-angle direction of the luminance distribution related to the lens member) is shown, the length direction of the light emitter of the LED is shown. And the non-condensing direction of the shaped diffuser plate (in the fifth embodiment, the narrow-angle direction of the luminance distribution related to the lens member) intersects at an angle of 0 degrees or more and 90 degrees or less, and the width direction of the light emitter of the LED is attached. The present invention also includes an arrangement in which the condensing direction of the shaped diffuser plate (in the fifth embodiment, the wide-angle direction of the luminance distribution related to the lens member) intersects at an angle of 0 ° to 90 °.

  (2) In each of the above-described embodiments, the case where the wide-angle direction and the narrow-angle direction are orthogonal to each other in the light distribution distribution related to each LED has been shown. However, in the light distribution distribution related to each LED, the wide-angle direction And the narrow-angle direction intersect with each other at an angle of 0 ° to 90 ° are also included in the present invention.

  (3) In each of the above-described embodiments, the light distribution distribution related to each LED is substantially symmetrical in the wide-angle direction and the narrow-angle direction. However, the light distribution distribution related to each LED is the wide-angle direction or the narrow-angle direction. What is made asymmetric with respect to any of the directions is also included in the present invention. In addition, the present invention includes those in which the light distribution of each LED is asymmetric in the wide-angle direction and the narrow-angle direction.

  (4) In addition to the above-described embodiments, the specific shape of the prism or cylindrical lens in the planar optical member (shaped diffusing plate or prism sheet) or lens member can be changed as appropriate. Specifically, in Embodiments 1 and 4, the apex angle of the prism can be changed to an angle other than that illustrated, or the prism can be asymmetrical. In the sixth embodiment, the curvature of the cylindrical lens on the spherical surface can be changed to something other than that shown in the figure.

  (5) In each of the above-described embodiments, the case where the prism portion or the cylindrical lens portion is formed on the surface on the front side of the planar optical member or the lens member has been shown. However, the prism portion or the cylindrical lens portion is replaced with the planar optical member. Or what was formed in the back side surface in a lens member is also contained in this invention.

  (6) In each of the above-described embodiments, the case where the prism portion or the cylindrical lens portion is integrally formed with the planar optical member or the lens member is shown. However, the prism portion or the cylindrical lens portion is replaced with the planar optical member or the lens member. What is made into a separate part from the base material of this, and was integrated by attaching with respect to a base material is also contained in this invention.

  (7) In each of the embodiments described above, the light distribution distribution of the LED is complemented by any one of the shaped diffuser plate, the prism sheet, and the lens member. Any two or all of the prism sheet and the lens member may be used together to supplement the light distribution of the LED. Specifically, two or more are appropriately overlapped from the shaped diffusion plate described in the first and sixth embodiments, the prism sheet described in the second embodiment, and the lens member described in the fourth and fifth embodiments. It is possible to use.

  (8) In the fifth embodiment described above, the light distribution distribution of the LED is complemented by the diffusion action having anisotropy by the substantially elliptical lens member, but this method is applied to the planar optical member as well. It is possible to apply.

  (9) In Embodiment 6 described above, the shaped diffuser plate is provided with a cylindrical lens portion as a selective condensing portion. However, this cylindrical lens portion may be the prism sheet of Embodiment 2 or Embodiment 4. This lens member can also be provided in place of the prism portion.

  (10) The arrangement configuration of the LED and the shaped diffuser plate described in the seventh embodiment can be similarly applied to the other embodiments (the second to sixth and eighth to tenth embodiments).

  (11) In each of the above-described embodiments, the case where all the LEDs accommodated in the chassis are the same member is shown, but the present invention includes a configuration in which LEDs having different structures are mixed in the chassis. It is. In that case, if the LED accommodated in the chassis includes at least one kind of LED having anisotropy in the light distribution, the LED having isotropicity in the light distribution may be included. I do not care. It is also possible to accommodate a plurality of types of LEDs having different LED element arrangements in the chassis, or a plurality of types of LEDs having different phosphor types, blending ratios, and the like.

  (12) In each of the above-described embodiments, the case where all the LED boards accommodated in the chassis are the same member is shown. However, the present invention includes a configuration in which LED boards having different structures are mixed in the chassis. include.

  (13) When the LED has a plurality of LED elements as in Embodiments 1 and 9, it is possible to include a plurality of LED elements having different emission colors (main emission wavelengths). Specifically, in the LED having three LED elements as in the ninth embodiment, a red light emitting LED element that emits red light, a green light emitting LED element that emits green light, and a blue light emitting LED that emits blue light. An element may be provided.

  (14) In the case where the LED has a plurality of LED elements as in the first and ninth embodiments, the planar arrangement of the plurality of LED elements can be changed as appropriate. Specifically, in the LED having three LED elements as in the ninth embodiment, the three LED elements are all arranged off the center of the LED, and are arranged in a substantially annular shape (triangle shape) so as to surround the center. Is also possible.

  (15) Besides the above-described embodiments, the type of phosphor to be included in the sealing material in the LED can be changed as appropriate. For example, in addition to the red phosphor and the green phosphor, a yellow phosphor that emits yellow light by blue light from the LED element can be used. Conversely, a yellow phosphor may be used instead of the red phosphor and the green phosphor.

  (16) In each of the above-described embodiments, the case where the LED has 1 to 3 LED elements is shown. However, the present invention includes a configuration in which the LED has 4 or more LED elements.

  (17) Besides the above-described embodiments, the specific number and arrangement of LEDs mounted on the LED board, the number and arrangement of LED boards in the chassis, and the like can be changed as appropriate.

  (18) In each of the above-described embodiments, the case where the color filter has three colored portions has been described. However, a color filter including four color portions by adding yellow to three colors of red, green, and blue is provided. The present invention can also be applied to other types.

  (19) In the above-described embodiments, the LED is used as the light source. However, other light sources such as an organic EL can be used.

  (20) In each of the above-described embodiments, the liquid crystal panel and the chassis are illustrated in a vertically placed state in which the short side direction coincides with the vertical direction. However, the liquid crystal panel and the chassis have the long side direction in the vertical direction. Those that are in a vertically placed state matched with are also included in the present invention.

  (21) In each of the embodiments described above, a TFT is used as a switching element of a liquid crystal display device. However, the present invention can also be applied to a liquid crystal display device using a switching element other than TFT (for example, a thin film diode (TFD)). In addition to the liquid crystal display device for display, the present invention can also be applied to a liquid crystal display device for monochrome display.

  (22) In each of the above embodiments, a liquid crystal display device using a liquid crystal panel as an example of the display panel has been exemplified. However, the present invention can also be applied to display devices using other types of display panels.

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

  DESCRIPTION OF SYMBOLS 10 ... Liquid crystal display device (display device), 11 ... Liquid crystal panel (display panel), 12 ... Backlight device (illumination device), 14, 314, 614, 714, 914 ... Chassis, 14a ... Bottom plate, 14b ... Light emission part , 15, 115, 215, 315 ... planar optical member (optical member), 15a, 215a, 515a, 615a, 715a ... shaped diffusion plate (optical member, planar optical member), 17, 117, 217, 317, 417, 617, 717, 817, 917 ... LED (light source), 18, 218, 618, 718, 918 ... LED substrate (light source substrate), 20, 320, 420, 620, 720, 820 ... LED element (light emitting element) , 23, 123, 323, 423, 623, 723, 823 ... luminous body, 24, 524 ... light diffusing substrate part, 25, 625 ... prism part (selectivity collection) Part), 26, 626 ... prism, 28 ... light transmissive substrate part, 29 ... prism part (selective condensing part), 31 ... prism part (selective condensing part), 32 ... prism, 33 ... cylindrical lens Part (selective condensing part), 34 ... cylindrical lens (prism), 330, 430 ... lens member (optical member), TV ... TV receiver

Claims (14)

A chassis having a light emitting portion for emitting light;
A light source housed in the chassis, having a light emitting body having a longitudinal shape, and having anisotropy in a light distribution of light emitted toward the light emitting portion;
Complementary optical action that is arranged on the light emitting part side with respect to the light source and complements the light distribution from the light source in the direction intersecting the length direction of the light emitter. And an optical member that emits light by applying light.   The illuminating device according to claim 1, wherein the optical member includes a selective condensing unit that selectively condenses light from the light source in a direction intersecting a length direction of the light emitter.   The selective condensing unit is formed of a prism having a shape extending along a length direction of the light emitter and a plurality of prisms arranged side by side along a direction orthogonal to the length direction of the light emitter. Item 3. The lighting device according to Item 2. The light emitter comprises a plurality of light emitting elements arranged along the length direction thereof,
The lighting device according to claim 2 or 3, wherein the selective condensing unit selectively imparts a condensing function to light from the light source in a direction intersecting with an arrangement direction of the light emitting elements. The chassis has a bottom plate disposed on the side opposite to the light emitting part,
5. The lighting device according to claim 1, wherein a plurality of the light sources are arranged side by side in a posture in which the light distributions are aligned with each other within a plate surface of the bottom plate. The chassis has a bottom plate disposed on the side opposite to the light emitting part,
6. The light source board according to claim 1, further comprising: a light source substrate that is mounted in a posture in which the light distributions are aligned with each other and that extends along the bottom plate. The lighting device described in 1. A plurality of the light sources are arranged side by side in the chassis,
The lighting device according to any one of claims 1 to 6, wherein the optical member is a planar optical member that is disposed so as to cover the light emitting portion.   The planar optical member is formed on the surface of the light diffusing base material portion for diffusing light from the light source, and on the surface of the light diffusing base material portion, and the light source emits light in the length direction. The illuminating device of Claim 7 which has a selective condensing part which selectively provides a condensing effect | action about the direction which cross | intersects.   The planar optical member is formed on the surface of the light transmissive base material portion that transmits light from the light source, and in the length direction of the light emitter to the light from the light source. The illuminating device according to claim 7, further comprising: a selective condensing unit that selectively imparts a condensing action in a direction intersecting with.   The selective condensing unit extends over the entire length of the planar optical member along a direction orthogonal to a condensing direction, which is a direction for condensing light from the light source, and along the condensing direction. The illumination device according to claim 8 or 9, comprising a plurality of prisms arranged side by side. A plurality of the light sources are arranged side by side in the chassis,
The lighting device according to any one of claims 1 to 10, wherein the optical member is a plurality of lens members arranged so as to individually cover the light source from the light emitting unit side.   A display device comprising: the lighting device according to claim 1; and a display panel that performs display using light from the lighting device.   The display device according to claim 12, wherein the display panel is a liquid crystal panel in which liquid crystal is sealed between a pair of substrates.   A television receiver comprising the display device according to claim 12 or 13.

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