WO2012165248A1

WO2012165248A1 - Illuminating apparatus, display apparatus, and television receiver

Info

Publication number: WO2012165248A1
Application number: PCT/JP2012/063154
Authority: WO
Inventors: 寺川　大輔
Original assignee: シャープ株式会社
Priority date: 2011-05-30
Filing date: 2012-05-23
Publication date: 2012-12-06

Abstract

A backlight apparatus (illuminating apparatus) (12) of the present invention is provided with: a plurality of LEDs (17) (light sources) which are disposed by being intermittently aligned with each other; a light guide plate (19) having a light input surface (19b), which is disposed to face the LEDs (17), and has light emitted from the LEDs (17) inputted thereto, and a light output surface (19a), which outputs the inputted light; a light transmitting member (15), which is disposed to cover at least a part of the light output surface (19a) of the light guide plate (19), and transmits the light outputted from the light output surface (19a); and a light blocking section (22) for blocking the light emitted from the LEDs (17), said light blocking section being provided on the light transmitting member (15), and being disposed on the side further towards the side on which the LEDs (17) are provided than at least the light input surface (19b), corresponding to at least the disposing pattern (light source disposing region (LA)) of the LEDs (17).

Description

Lighting device, display device, and television receiver

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

In recent years, the display elements of image display devices such as television receivers are shifting from conventional cathode ray tubes to thin display panels such as liquid crystal panels and plasma display panels, which enables thinning of image display devices. Since the liquid crystal panel used for the liquid crystal display device does not emit light by itself, a backlight device is separately required as a lighting device, and the backlight device is roughly classified into a direct type and an edge light type according to the mechanism. In order to further reduce the thickness of the liquid crystal display device, it is preferable to use an edge light type backlight device, and an example described in Patent Document 1 below is known.

JP 2008-171719 A

(Problems to be solved by the invention)
The edge light type backlight device may adopt a configuration in which a plurality of light sources are intermittently arranged in parallel along the light incident surface provided at the end of the light guide plate. In this case, the following problem may occur. There is sex. That is, not all of the light emitted from the light source is incident on the light incident surface of the light guide plate, but a part of the light is directly incident on the light source side end portion of the light transmissive member laminated on the light guide plate, for example. In addition, by entering a gap that may occur between the light guide plate and the light transmissive member, the light may be emitted to the outside without being incident on the light incident surface of the light guide plate. At this time, when the light from the light sources intermittently arranged in parallel is emitted outside without passing through the light guide plate as described above, the observer views the light emission surface of the light guide plate from an oblique direction. As a result, there is a possibility that uneven brightness may be generated.

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

(Means for solving problems)
The illumination device according to the present invention includes a plurality of light sources intermittently arranged side by side, a light incident surface that is arranged to face the light sources and receives light from the light sources, and emits the incident light. A light guide plate having a light output surface, a light transmissive member arranged to cover at least a part of the light output surface of the light guide plate and transmitting light from the light output surface, and the light transmissive member A light-shielding portion that is disposed at least on the light source side with respect to the light incident surface and that is disposed at least following the arrangement pattern of the light source and blocks light from the light source.

In this way, the light emitted from the plurality of light sources is incident on the light incident surface arranged to face the light sources, then propagates through the light guide plate, and then is emitted from the light emitting surface. The light emitted from the light emitting surface is emitted to the outside through the light transmissive member. By the way, a part of the light emitted from each light source directly enters the light source side end of the light transmissive member or enters a gap that may be generated between the light guide plate and the light transmissive member. Thus, there is a possibility that the light is emitted to the outside without being incident on the light incident surface of the light guide plate.

In that respect, in the present invention, the light from each light source is blocked by the light shielding portion provided on the light transmissive member and disposed at least on the light source side from the light incident surface. The light can be prevented from being emitted to the outside without entering the incident surface. As a result, for example, when the light exit surface of the light guide plate is viewed obliquely, it is difficult to cause a situation in which light from each light source is directly recognized without passing through the light guide plate. In addition, since the light shielding portion is arranged at least following the arrangement pattern of the light sources, when the light emitting surface is viewed obliquely, the light from each light source is visually recognized as a bright spot that follows the arrangement pattern of the light sources. It is possible to make it difficult to generate luminance unevenness. And since the light-shielding part is provided in the light transmissive member, it is excellent in the workability | operativity which concerns on an assembly | attachment.

The following configuration is preferable as an embodiment of the present invention.
(1) A plurality of the light transmissive members are arranged in a stacked manner, and the light shielding portion is provided on the light transmissive member closest to the light guide plate among the plurality of light transmissive members. . In this way, there is a possibility that a gap is formed between the plurality of light transmissive members stacked on each other, and light from the light source enters the gap and is emitted to the outside without entering the light incident surface. However, in the present invention, it is possible to prevent light from entering the gap by the light shielding portion provided in the light transmissive member closest to the light guide plate among the plurality of light transmissive members. Thereby, it can prevent more reliably that the light from a light source radiate | emits outside, without entering into the light-incidence surface of a light-guide plate.

(2) The said light-shielding part is distribute | arranged to the surface by the side of the light guide plate among the surface by the side of the said other light transparent member in the said light transparent member, and the surface by the side of the said light guide plate. If it does in this way, it can prevent by the light shielding part that the light from a light source enters into the light source side edge part in the light transmissive member in which the light shielding part was provided. Thereby, it can prevent more reliably that the light from a light source radiate | emits outside, without entering into the light-incidence surface of a light-guide plate.

(3) In addition to being disposed on the light source side with respect to the light incident surface, the light shielding portion is disposed on the opposite side to the light source side with respect to the light incident surface and the light source in the light guide plate It overlaps with the edge part of a side seeing on a plane. At the end of the light guide plate on the light source side, the light from the light source incident on the light incident surface may be emitted from the light exit surface as it is without hitting the other surface of the light guide plate. When the emission surface is viewed obliquely, it may be visually recognized as a bright spot. In that respect, in the present invention, since the light shielding portion is arranged on the side opposite to the light source side with respect to the light incident surface and overlaps with the end portion on the light source side of the light guide plate in plan view, the light source side in the light guide plate In this end portion, the light from the light source incident on the light incident surface can be prevented from being emitted as it is from the light emitting surface without hitting the other surface of the light guide plate. Thereby, luminance unevenness in which a bright spot that follows the arrangement pattern of the light source is visually recognized is further less likely to occur.

(4) In addition to the arrangement pattern of the light sources, the light shielding part is arranged following the non-arrangement pattern of the light sources. In this way, even if there is a deviation in the positional relationship between the light shielding unit and the light source in the arrangement direction of the light sources, each of the light shielding units arranged in accordance with the light source non-arrangement pattern in addition to the light source arrangement pattern. The light from the light source can be reliably blocked. Thereby, luminance unevenness can be made more difficult to occur.

(5) The light-shielding portion has a constant width and extends along the arrangement direction of the light sources. In this way, since the shape of the light-shielding portion is simple, the manufacturing cost for the light-shielding portion is reduced, and it is difficult to cause catching on other members and the like, and the handleability is excellent.

(6) The light-shielding part has light reflectivity for reflecting light, and follows a light source arrangement pattern, a low light reflectance part having a relatively low light reflectance, and a light source non-arrangement pattern And a high light reflectance part having a relatively high light reflectance. In this way, the light emitted from each light source and directed to the light shielding part is suppressed by the low light reflectance part that follows the arrangement pattern of the light source, whereas the high light reflectance that follows the non-arrangement pattern of the light source Reflection is made highly efficient by the part. Therefore, unevenness due to the arrangement pattern and the non-arrangement pattern of the light source is less likely to occur in the amount of light in the light guide plate incident from the light incident surface. Thereby, it is difficult to visually recognize the luminance unevenness even when the light exit surface of the light guide plate is viewed from an oblique direction or from the front.

(7) The low light reflectance portion has a light reflectance that increases in a direction away from the center position of the light source in the arrangement direction of the light sources. The amount of light in the light guide plate is the highest in the center position of the light source in the direction of the light source, and tends to decrease in the direction away from the light source, so the light reflectance in the low light reflectance part that follows the light source arrangement pattern As described above, the light quantity in the light guide plate is less likely to be uneven.

(8) The light shielding portion is formed with an opening that follows the non-arrangement pattern of the light source. The light from each light source toward the light source side end side of the light transmissive member is suppressed from being visually recognized as a bright spot by being largely blocked by the light shielding portion that follows the light source arrangement pattern. A part of the light is emitted to the outside through the opening that follows the non-arrangement pattern of the light source without passing through the light guide plate. Here, compared to the case where the light shielding part is also configured to follow the non-arrangement pattern of the light source, the amount of light absorbed by the light shielding part is relatively small. Differences in the amount of light emitted to the light source are less likely to occur, whereby luminance unevenness can be reduced. In addition, since the opening is a mode that follows the non-arrangement pattern of the light source that has a relatively small amount of light compared to the arrangement pattern of the light source, the light emitted to the outside through the opening is almost visually recognized as a bright spot. Absent.

(9) The light shielding portion is a separate component from the light transmissive member and is attached to the light transmissive member. In this way, by using a light shielding part as a separate component from the light transmissive member, a general-purpose light transmissive member can be used, so that the cost associated with the light transmissive member can be kept low. it can.

(10) The light shielding portion is made of a reflecting member that reflects light. In this way, since a general-purpose reflecting member can be used as the light shielding part, the cost associated with the light shielding part can be kept low.

(11) The light transmissive member is configured such that an end portion on the light source side protrudes toward the light source side from the light incident surface, and the light shielding portion is disposed on the light source side of the light transmissive member. It is integrally formed at the end. If it does in this way, it is excellent in the handleability etc. of a light-shielding part and a light transmissive member.

(12) The light-shielding portion is formed by printing a light-shielding material on the surface of the light transmissive member. If it does in this way, the freedom degree at the time of designing a light-shielding part can be made high.

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, it is possible to realize display with excellent display quality.

A liquid crystal panel can be exemplified as the display 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.

(The invention's effect)
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. Exploded perspective view showing schematic configuration of liquid crystal display device The top view which shows arrangement | positioning structure of the chassis in the backlight apparatus with which a liquid crystal display device is equipped, a light-guide plate, and an LED board. Sectional view taken along line iv-iv in FIG. Partially cutaway plan view showing the arrangement configuration of the LED, the light shielding portion, and the light transmissive member Enlarged plan view of the low light reflectance part in the light shielding part The graph showing the change of the light reflectance of the light-shielding part regarding the arrangement direction of LED The partially notched top view which shows arrangement structure of LED which concerns on the modification 1 of Embodiment 1, and a light shielding part and a light transmissive member Enlarged plan view of the low light reflectance part in the light shielding part The graph showing the change of the light reflectance of the light-shielding part regarding the arrangement direction of LED The graph showing the change of the light reflectivity of the light-shielding part regarding the arrangement direction of LED which concerns on the modification 2 of Embodiment 1. The graph showing the change of the light reflectivity of the light-shielding part regarding the arrangement direction of LED which concerns on the modification 3 of Embodiment 1. The partially cutout top view which shows arrangement structure of LED which concerns on the modification 4 of Embodiment 1, and a light shielding part and a light transmissive member The partially cutout top view which shows arrangement structure of LED which concerns on the modification 5 of Embodiment 1, and a light-shielding part and a light transmissive member Sectional drawing which shows arrangement | positioning structure of the light-shielding part in the light transmissive member which concerns on the modification 6 of Embodiment 1. FIG. The partially notched top view which shows arrangement structure of LED which concerns on the modification 7 of Embodiment 1, and a light-shielding part and a light transmissive member Xvii-xvii sectional view of FIG. The top view which shows arrangement structure of LED and light-shielding part which concerns on Embodiment 2 of this invention. Xix-xix cross-sectional view of FIG. Xx-xx line sectional view of FIG. The top view which shows the arrangement configuration of LED and the light-shielding part which concern on the modification 1 of Embodiment 2. FIG. The top view which shows arrangement structure of LED and the light-shielding part which concern on the modification 2 of Embodiment 2. FIG. Xxiii-xxiii sectional view of FIG. The top view which shows the arrangement configuration of LED and light-shielding part which concerns on Embodiment 3 of this invention. Bottom view showing arrangement configuration of LED and light shielding part Xxvi-xxvi cross-sectional view of FIGS. 24 and 25 Xxvii-xxvii cross-sectional view of FIGS. 24 and 25 Sectional drawing which shows the arrangement structure of the light-shielding part in the light transmissive member which concerns on the modification 1 of Embodiment 3, and was cut | disconnected in the light source arrangement | positioning area | region. Sectional drawing which shows arrangement | positioning structure of the light-shielding part in a light transmissive member, and was cut | disconnected in the light source non-arrangement area | region Sectional drawing which shows the arrangement structure of the light transmissive member and light-shielding part which concern on the modification 2 of Embodiment 3, and was cut | disconnected in the light source arrangement | positioning area | region. Sectional drawing which shows arrangement | positioning structure of a light transmissive member and a light-shielding part, and was cut | disconnected in the light source non-arrangement area | region Sectional drawing which shows the arrangement structure of the light transmissive member and light-shielding part which concern on the modification 3 of Embodiment 3, and was cut | disconnected in the light source arrangement | positioning area | region. Sectional drawing which shows arrangement | positioning structure of a light transmissive member and a light-shielding part, and was cut | disconnected in the light source non-arrangement area | region The top view which shows the arrangement configuration of the 1st light shielding part in the light shielding part which concerns on the modification 4 of Embodiment 3. FIG. Xxxv-xxxv cross-sectional view of Fig. 34 Xxxvi-xxxvi sectional view of FIG. The top view which shows the arrangement configuration of the 1st light shielding part in the light shielding part which concerns on the modification 5 of Embodiment 3. FIG. The bottom view which shows the arrangement configuration of the 2nd light-shielding part in a light-shielding part Xxxix-xxxix cross-sectional view of FIGS. 37 and 38 Xxxx-xxxx cross-sectional view of FIGS. 37 and 38 Sectional drawing which shows the arrangement structure of the light-shielding part in the light transmissive member which concerns on the modification 6 of Embodiment 3, and was cut | disconnected in the light source arrangement | positioning area | region. Sectional drawing which shows arrangement | positioning structure of the light-shielding part in a light transmissive member, and was cut | disconnected in the light source non-arrangement area | region

<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 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 rectangular shape (rectangular shape, longitudinal 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.

As shown in FIG. 2, the liquid crystal panel 11 has a horizontally long rectangular shape (rectangular shape, longitudinal shape) in a plan view, and a pair of glass substrates having excellent translucency are separated by a predetermined gap. In addition, the liquid crystal is sealed between both substrates. One 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. Are provided with a color filter in which colored portions such as R (red), G (green), and B (blue) are arranged in a predetermined arrangement, a counter electrode, and an alignment film. A polarizing plate is disposed on the outside of both substrates.

As shown in FIG. 2, the backlight device 12 includes a chassis 14 having a substantially box shape having a light emitting portion 14 c that opens toward the front side (light emitting side, liquid crystal panel 11 side), and light emitting from the chassis 14. A light transmissive member 15 disposed so as to cover the portion 14c. Furthermore, 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 a light transmissive member 15 (liquid crystal panel) that guides light from the LED 17. 11) and a frame (pressing member) 16 for pressing the light guide plate 19 and the light transmissive member 15 from the front side. The backlight device 12 includes LED substrates 18 having LEDs 17 at both ends on the long side, and a light guide plate 19 disposed at the center between the LED substrates 18 on both sides. The so-called edge light type (side light type) is used. Below, each component of the backlight apparatus 12 is demonstrated in detail.

The chassis 14 is made of a metal plate such as an aluminum plate or an electrogalvanized steel plate (SECC), for example, and as shown in FIGS. 2 to 4, a bottom plate 14a having a horizontally long rectangular shape similar to the liquid crystal panel 11, and a bottom plate It consists of a side plate 14b that rises one by one from each outer end on the long side and the short side in 14a. The long side direction of the chassis 14 (bottom plate 14a) coincides with the X-axis direction (horizontal direction), and the short side direction coincides with the Y-axis direction (vertical direction). Further, the frame 16 and the bezel 13 can be screwed to the side plate 14b.

As shown in FIG. 2, the light transmissive member 15 has a horizontally long rectangular shape as seen in a plan view like the liquid crystal panel 11 and the chassis 14, and the long side direction on the main surface is short with the X axis direction. The side direction coincides with the Y-axis direction, and the thickness direction perpendicular to the main surface coincides with the Z-axis direction. The light transmissive member 15 is placed on the front side (light emitting side) of the light guide plate 19 and is disposed between the liquid crystal panel 11 and the light guide plate 19. The light transmissive member 15 is disposed so as to cover the light emitting surface 19a of the light guide plate 19 from the front side over almost the entire area, thereby transmitting the emitted light from the light emitting surface 19a and providing a predetermined optical action. The light can be emitted toward the liquid crystal panel 11 side.

As shown in FIGS. 2 and 4, the light transmissive member 15 has a sheet shape that is thinner than the light guide plate 19, and a plurality of, specifically, four, are laminated and arranged. Yes. Specific examples of the light transmissive member 15 include a diffusion sheet 15a, a prism sheet (lens sheet) 15b, a reflective polarizing sheet 15c, and the like, which can be appropriately selected and used. is there. In the present embodiment, a configuration in which the light transmissive member 15 is laminated in the order of one diffusion sheet 15a, two prism sheets 15b, and one reflective polarizing sheet 15c from the back side is illustrated. Among these, the diffusion sheet 15a has a function of diffusing light from the light guide plate 19 by bonding a diffusion layer in which light diffusion particles are dispersed and blended to the surface of a transparent base made of synthetic resin. The prism sheet 15b has a prism for adjusting the traveling direction of light from the diffusion sheet 15a. The reflective polarizing sheet 15c has, for example, a multilayer structure in which layers having different refractive indexes are alternately stacked. The reflective polarizing sheet 15c transmits p-waves of light from the prism sheet 15b and reflects s-waves toward the light guide plate 19 side. This makes it possible to increase the light utilization efficiency (and hence the luminance).

As shown in FIG. 2, the frame 16 is made of a synthetic resin and is formed in a frame shape (frame shape) extending along the outer peripheral edge portions of the light transmissive member 15 and the light guide plate 19. The light transmitting member 15 and the outer peripheral edge of the light guide plate 19 are opposed to each other and can be pressed from the front side over almost the entire circumference. Specifically, this frame 16 has a slight gap between it and the main surface on the front side of the light transmitting member 15 (reflective polarizing sheet 15c) arranged on the most front side (opposite side to the light guide plate 19 side). While being held, they are arranged to face each other, so that the light transmitting member 15 can be prevented from wrinkling due to being restrained by the frame 16 during thermal expansion or thermal contraction. Further, the frame 16 can receive the outer peripheral edge of the liquid crystal panel 11 from the back side.

2 and 4, the LED 17 has a configuration in which an LED chip is sealed with a resin material on a substrate portion fixed to the LED substrate 18. The LED chip mounted on the substrate unit has one main emission wavelength, and specifically, one that emits blue light in a single color is used. On the other hand, the resin material that seals the LED chip is dispersed and blended with a phosphor that emits a predetermined color when excited by the blue light emitted from the LED chip, and generally emits white light as a whole. It is said. In addition, as the phosphor, for example, a yellow phosphor that emits yellow light, a green phosphor that emits green light, and a red phosphor that emits red light are used in appropriate combination, or any one of them is used. It can be used alone. The LED 17 is a so-called top type in which a surface opposite to the mounting surface with respect to the LED substrate 18 (a surface facing the light guide plate 19) is a main light emitting surface. It should be noted that light is emitted from each side surface of the LED 17 adjacent to the main light emitting surface, albeit slightly.

As shown in FIGS. 2 to 4, the LED substrate 18 has an elongated plate shape extending along the long side direction of the chassis 14 (X-axis direction, the longitudinal direction of the light incident surface 19 b of the light guide plate 19). The main surface is accommodated in the chassis 14 in a posture parallel to the X-axis direction and the Z-axis direction, that is, in a posture orthogonal to the plate surfaces of the liquid crystal panel 11 and the light guide plate 19 (light transmissive member 15). The LED boards 18 are arranged in pairs corresponding to both ends on the long side in the chassis 14 and are attached to the inner surfaces of the side plates 14b on the long side. The LED 17 having the above-described configuration is surface-mounted on the inner surface of the LED substrate 18, that is, the surface facing the light guide plate 19 side (the surface facing the light guide plate 19), and this is the mounting surface. The On the mounting surface of the LED substrate 18, a plurality of LEDs 17 are arranged in a line (linearly) in parallel along the length direction (X-axis direction) with a predetermined interval. That is, it can be said that a plurality of LEDs 17 are intermittently arranged in parallel along the long side direction at both ends on the long side of the backlight device 12. The interval between the LEDs 17 adjacent to each other in the X-axis direction, that is, the arrangement pitch of the LEDs 17 is substantially equal. Note that the arrangement direction of the LEDs 17 coincides with the length direction (X-axis direction) of the LED substrate 18. On the mounting surface of the LED substrate 18, a wiring pattern (not shown) made of a metal film (such as a copper foil) that extends along the X-axis direction and connects adjacent LEDs 17 across the LED 17 group in series. The terminal portions formed at both ends of the wiring pattern are connected to an external LED driving circuit, so that driving power can be supplied to each LED 17. Since the pair of LED boards 18 are housed in the chassis 14 with the mounting surfaces of the LEDs 17 facing each other, the main light emitting surfaces of the LEDs 17 respectively mounted on the LED boards 18 are opposed to each other. The optical axis of each LED 17 substantially coincides with the Y-axis direction. In other words, the LEDs 17 mounted on the pair of LED substrates 18 are respectively arranged in opposition to both ends in the Y-axis direction (both ends on the long side) of the light guide plate 19. Further, the base material of the LED substrate 18 is made of metal like the chassis 14, and the wiring pattern (not shown) described above is formed on the surface thereof via an insulating layer. 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 light guide plate 19 is made of a synthetic resin material (for example, acrylic resin such as PMMA or polycarbonate) having a refractive index sufficiently higher than air and substantially transparent (excellent translucency). As shown in FIG. 2, the light guide plate 19 has a horizontally long rectangular shape in a plan view as in the case of the liquid crystal panel 11 and the chassis 14, and has a plate shape that is thicker than the light transmissive member 15. The long side direction on the main surface coincides with the X-axis direction, the short side direction coincides with the Y-axis direction, and the plate thickness direction orthogonal to the main surface coincides with the Z-axis direction. As shown in FIG. 3, the light guide plate 19 is disposed in the chassis 14 at a position directly below the liquid crystal panel 11 and the light transmissive member 15, and forms a pair disposed at both ends of the long side of the chassis 14. The LED boards 18 are arranged so as to be sandwiched in the Y-axis direction. Therefore, the alignment direction of the LED 17 (LED substrate 18) and the light guide plate 19 coincides with the Y-axis direction, whereas the alignment direction of the light transmissive member 15 (liquid crystal panel 11) and the light guide plate 19 is the Z-axis direction. And the arrangement directions of the two are orthogonal to each other. The light guide plate 19 introduces light emitted from the LED 17 in the Y-axis direction, and rises and emits the light toward the light transmissive member 15 side (front side) while propagating the light inside. Have

The light guide plate 19 has a substantially flat plate shape extending along each main surface of the bottom plate 14a of the chassis 14 and the light transmissive member 15, and the main surface is parallel to the X-axis direction and the Y-axis direction. Is done. Of the main surface of the light guide plate 19, the surface facing the front side is a light emitting surface 19 a that emits internal light toward the light transmissive member 15 and the liquid crystal panel 11. Of the outer peripheral end surfaces adjacent to the main surface of the light guide plate 19, both end surfaces on the long side that are long along the X-axis direction are opposed to the LED 17 (LED substrate 18) with a predetermined space therebetween. These constitute a pair of light incident surfaces 19b on which the light emitted from the LEDs 17 is incident. As shown in FIG. 3, a light source reflection sheet 20 is disposed on the back side of the space held between the LED 17 and the light incident surface 19b, thereby reflecting the light from the LED 17 to the front side to produce light. It is possible to efficiently enter the incident surface 19b. The light source reflection sheet 20 is made of a synthetic resin, and the surface thereof is white with excellent light reflectivity. The light incident surface 19b is a surface that is parallel to the X-axis direction and the Z-axis direction, and is a surface that is substantially orthogonal to the light emitting surface 19a. Further, the light incident surface 19b is substantially flush with the end surface of the light transmissive member 15 on the LED 17 side. Further, the alignment direction of the LED 17 and the light incident surface 19b coincides with the Y-axis direction and is parallel to the light emitting surface 19a.

A light guide reflection sheet 21 that reflects the light in the light guide plate 19 and can be raised to the front side is provided on the surface 19c of the light guide plate 19 opposite to the light emitting surface 19a so as to cover the entire area. ing. In other words, the light guide reflection sheet 21 is disposed between the bottom plate 14 a of the chassis 14 and the light guide plate 19. The light guide reflection sheet 21 is made of a synthetic resin, and the surface of the light guide reflection sheet 21 is white with excellent light reflectivity, similar to the light source reflection sheet 20 described above. Note that at least one of the light exit surface 19a and the surface 19c on the opposite side of the light guide plate 19 has a reflecting portion (not shown) that reflects internal light or a scattering portion (not shown) that scatters internal light. Are patterned so as to have a predetermined in-plane distribution, whereby the light emitted from the light exit surface 19a is controlled to have a uniform distribution in the plane.

Now, as shown in FIG. 4, the light transmissive member 15 is provided with a light shielding portion 22 that is disposed closer to the LED 17 than the light incident surface 19 b of the light guide plate 19 and shields light from the LED 17. A pair of light shielding portions 22 is provided at both ends on the long side of the light transmissive member 15, that is, at both ends on the LED 17 side. The light shielding portion 22 is a separate component from the light transmissive member 15 and is attached to the light transmissive member 15 with an adhesive or the like. Thereby, since the light-shielding part 22 is integrated with the light-transmitting member 15, the workability when the backlight device 12 is assembled is excellent. The light shielding part 22 is made of a synthetic resin, and the surface of the light shielding part 22 exhibits a white color with excellent light reflectivity, similar to the light source reflection sheet 20 and the light guide reflection sheet 21 described above. In other words, the light shielding unit 22 is manufactured by using a reflection sheet that is generally used for the backlight device 12. Therefore, the light shielding unit 22 has extremely high light reflectivity and light shielding property, and the light reflectance is a value close to 100% (for example, a range of 90% to 100%), and the light transmittance is 0. % (For example, a range of 0% to 10%). And since the light-shielding part 22 is distribute | arranged in the shape which protrudes from the light-incidence surface 19b of the light-guide plate 19 to the LED17 side, and is arrange | positioned in opposition with the light source reflective sheet 20 distribute | arranged on the back side, from LED17 The emitted light can be efficiently incident on the light incident surface 19 b while being repeatedly reflected between the light source reflection sheet 20. Since the light shielding portion 22 has sufficient light shielding properties in addition to the light reflectivity as described above, the light from the LED 17 directly enters the end portion on the LED 17 side of each light transmissive member 15. Can be regulated. Note that most of the light irradiated to the light shielding unit 22 is reflected without being transmitted, but is absorbed even though it is a very small amount.

The light shielding part 22 is attached to the light transmissive member 15 in which a plurality of sheets are stacked on one another, which is directly mounted on the light emitting surface 19 a of the light guide plate 19, that is, the diffusion sheet 15 a closest to the light guide plate 19. ing. As a result, the light from the LED 17 is blocked by the light blocking portion 22 and is directly incident on the end portion on the LED 17 side of each of the prism sheets 15b and the reflective polarizing sheet 15c laminated at least on the front side of the diffusion sheet 15a. Or entering each gap that may occur between each prism sheet 15b and the reflective polarizing sheet 15c. The light shielding part 22 is attached to the back side of the pair of front and back main surfaces of the diffusion sheet 15a, that is, the main surface on the light guide plate 19 side. As a result, the light from the LED 17 is blocked by the light blocking portion 22 and directly enters the end of the diffusion sheet 15a on the LED 17 side, or enters a gap that may be generated between the diffusion sheet 15a and the light guide plate 19. Is prevented.

As shown in FIGS. 4 and 5, the light shielding portion 22 includes a first portion 22 a disposed on the LED 17 side (the end side of the light guide plate 19 and the light transmissive member 15) with respect to the light incident surface 19 b of the light guide plate 19. The second portion 22b is disposed on the opposite side of the light incident surface 19b from the LED 17 side (center side in the light guide plate 19 and the light transmissive member 15). That is, the light shielding part 22 is arranged in a range extending over the LED 17 side and the light emitting surface 19a side while straddling the light incident surface 19b. Among the light shielding portions 22, the first portion 22 a protrudes in a cantilevered manner from the end portions of the light guide plate 19 and the light transmissive member 15 toward the LED 17, whereas the second portion 22 b extends from the light guide plate 19. Are superimposed directly on the light emitting surface 19a. Accordingly, the second portion 22b of the light shielding portion 22 blocks the light that is incident on the light incident surface 19b of the light guide plate 19 and then travels directly toward the light output surface 19a without hitting any surface other than the light output surface 19a of the light guide plate 19. It is possible. Note that a gap corresponding to the thickness of the light shielding part 22 is retained between the light transmissive member 15 (the diffusion sheet 15 a) provided with the light shielding part 22 and the light emitting surface 19 a of the light guide plate 19.

As shown in FIGS. 2 and 5, the light shielding portion 22 has a horizontally long rectangular shape extending along the long side direction of the light transmissive member 15 with a constant width, that is, along the arrangement direction (X axis direction) of the LEDs 17. Therefore, the long side direction and the short side direction coincide with the long side direction and the short side direction of the light transmissive member 15. Accordingly, the light shielding unit 22 crosses the region where the LEDs 17 are arranged (a light source arrangement region LA described later) and the region where the LEDs 17 are not arranged (a light source non-arrangement region LN described later) in the direction in which the LEDs 17 are arranged. Arranged over a range. In other words, it can be said that the light-shielding portion 22 follows the arrangement pattern of the LEDs 17 and also follows the non-arrangement pattern of the LEDs 17. As a result, light emitted from the LEDs 17 arranged intermittently along the X-axis direction is generated between the LED 17 side end of the light transmissive member 15 or between the laminated light transmissive members 15. It is possible to more reliably block the gaps that can be obtained and the gaps that can occur between the light transmissive member 15 and the light guide plate 19. FIG. 5 is a plan view in which the light transmissive member 15 is partially cut out. In the left part of the figure, the light transmission member 15 is cut out, and the planar configuration of the light shielding portion 22 and the light guide plate 19 is shown. On the right side of the figure, the planar configuration of the light shielding part 22 and the light guide plate 19 (particularly the light incident surface 19b) with respect to the light transmissive member 15 that is not cut out is shown.

The “LED 17 arrangement pattern” here refers to a light source arrangement area that is an arrangement range of the LEDs 17 in the X-axis direction, that is, the arrangement direction of the LEDs 17 (light sources that overlap with the LEDs 17 in the arrangement direction of the LEDs 17 (positional relations coincide)). Superimposition area) LA. On the other hand, the “non-arrangement pattern of LEDs 17” is a light source non-arrangement region that is a range in which the LEDs 17 are not arranged in the arrangement direction of the LEDs 17 (light sources that do not overlap with the LEDs 17 in the arrangement direction of the LEDs 17). Non-overlapping area) LN. Further, in the light source non-arrangement region LN described above, a region located between adjacent LEDs 17 in the arrangement direction of the LEDs 17 and a pair of LEDs 17 arranged at both ends in the arrangement direction of the LEDs 17 (adjacent to the center). A region shifted to the opposite side of the matching LED 17 side).

As shown in FIGS. 5 and 7, the light shielding portion 22 is partially provided with a low light reflectance portion 23 having a light reflectance relatively lower than the light reflectance of the surface thereof. The low light reflectance portion 23 is configured to follow the light source arrangement area LA (the arrangement pattern of the LEDs 17). A portion of the light shielding portion 22 where the low light reflectance portion 23 is not provided is a high light reflectance portion 24 having a relatively higher light reflectance than the low light reflectance portion 23, and the high light reflectance portion. 24 is configured to follow the light source non-arrangement region LN (non-arrangement pattern of the LEDs 17). And the low light reflectance part 23 is distribute | arranged to the LED 17 side rather than the light-incidence surface 19b by providing in the 2nd part 22b among the light-shielding parts 22. FIG. Therefore, in the second part 22b of the light shielding part 22, the low light reflectance part 23 and the high light reflectance part 24 are alternately and repeatedly arranged in parallel in the X-axis direction, which is the arrangement direction of the LEDs 17. Become. The low light reflectivity portions 23 are arranged intermittently in parallel along the X-axis direction in the same manner as the LED 17, and the parallel number and arrangement interval of the LEDs 17 are substantially equal to the parallel number and arrangement interval of the LEDs 17. .

Specifically, as shown in FIG. 5, the low light reflectance portion 23 has a semicircular shape when seen in a plan view, and the bottom of the linear shape is opposite to the LED 17 side of the light shielding portion 22. In contrast to the end face associated with the end portion on the side, the curved semicircular arc portion is opposed to the LED 17. Accordingly, the area of the low light reflectance portion 23 increases as it approaches the center position of the LED 17 in the X-axis direction, while the area decreases as it moves away from the center position of the LED 17. The center position of the low light reflectance portion 23 in the X-axis direction substantially coincides with the center position of the LED 17. The low light reflectance portion 23 has a formation range in the X-axis direction that is substantially the same size as the LED 17 (light source arrangement area LA), and a positional relationship in which the entire area overlaps the LED 17 (light source arrangement area LA) in the X-axis direction. It is said. Further, the area of the low light reflectance portion 23 decreases as it approaches the LED 17 in the Y-axis direction, while the area increases as it moves away from the LED 17. That is, the low light reflectivity portion 23 is configured such that the dimension in the X-axis direction gradually increases toward the direction away from the LED 17 in the Y-axis direction. The low light reflectance portion 23 has a formation range in the Y-axis direction that is substantially the same size as the second portion 22b in the light shielding portion 22, and the light incident surface 19b is seen in a plane with respect to the semicircular arc-shaped portion. Arranged to be tangent. Moreover, the low light reflectance part 23 is made into the symmetrical shape centering | focusing on the center position of LED17 about the X-axis direction.

The low light reflectivity portion 23 is provided by printing, for example, a paint exhibiting black as a low light reflectivity material on the surface of the light shielding portion 22 exhibiting white. In providing the low light reflectance portion 23, for example, printing means such as screen printing and inkjet printing can be employed. As shown in FIG. 6, the low light reflectivity portion 23 is composed of a large number of dots 23a made of a low light reflectivity material, and the area and arrangement interval of the dots 23a are substantially constant. That is, since the distribution density of the dots 23a constituting the low light reflectance portion 23 is substantially constant, the light reflectance in the low light reflectance portion 23 is almost the entire region as shown in FIG. It is assumed to be constant.

This embodiment has the structure as described above, and its operation will be described next. When the power supply of the liquid crystal display device 10 having the above-described configuration is turned on, the driving of the liquid crystal panel 11 is controlled by a control circuit (not shown) and the driving power from the LED driving circuit (not shown) is supplied to each LED 17 on the LED substrate 18. This controls the drive. The light from each LED 17 is guided by the light guide plate 19, so that the liquid crystal panel 11 is irradiated through the light transmissive member 15, and a predetermined image is displayed on the liquid crystal panel 11. Hereinafter, the operation of the backlight device 12 will be described in detail.

When each LED 17 is turned on, the light emitted from each LED 17 enters the light incident surface 19b of the light guide plate 19 facing the LED 17, as shown in FIG. The light incident on the light incident surface 19b is reflected by the light guide reflection sheet 21 or totally reflected at the interface with the outside of the light guide plate 19, and then propagates through the light guide plate 19 and then from the light exit surface 19a. The light is emitted to the outside on the front side. The light emitted from the light emitting surface 19 a passes through the light transmissive member 15, is given a predetermined optical action, and then is emitted toward the liquid crystal panel 11. At this time, among the light transmissive members 15, the diffusion sheet 15a imparts a diffusing action to the light, the prism sheet 15b imparts a condensing action to the light, and the reflective polarizing sheet 15c A polarizing action and a reflecting action are imparted to.

By the way, not all of the light emitted from each LED 17 is incident on the light incident surface 19b of the light guide plate 19, and a part of the light on the light transmissive member 15 laminated on the light guide plate 19, for example, on the LED 17 side. By directly entering the end portion, entering a gap that can be formed between the light transmissive members 15 stacked on each other, or entering a gap that may be formed between the light guide plate 19 and the light transmissive member 15, etc. There is a possibility that the light is emitted so as to leak outside without entering the light incident surface 19b of the optical plate 19. At this time, when the light from the LEDs 17 arranged intermittently in parallel is emitted (leaks out) without passing through the light guide plate 19 as described above, the observer emits the light emission surface 19a of the light guide plate 19. When viewed from an oblique direction, it is visually recognized that bright luminescent spots are locally arranged intermittently, and as a result, luminance unevenness may occur.

However, in this embodiment, the light from each LED 17 is shielded by the light shielding portion 22 provided on the light transmissive member 15 and arranged on the LED 17 side from the light incident surface 19b. Can be prevented from being emitted to the outside without entering the light incident surface 19b. That is, the light traveling from each LED 17 toward the oblique front side with respect to the light incident surface 19b is directed to the back side by being reflected by the light shielding unit 22 at a stage just before entering the end portion of the light transmissive member 15 on the LED 17 side. The light incident surface 19b or the light shielding part 22 is directed toward the light source reflection sheet 20 facing the back side. Thereby, when the light emission surface 19a of the light guide plate 19 is viewed from an oblique direction, it is difficult to cause a situation in which light from each LED 17 leaks out and is directly recognized without passing through the light guide plate 19. In addition, since the light shielding portion 22 is arranged following the light source arrangement area LA that is the arrangement pattern of the LEDs 17, when the observer views the light emitting surface 19a from an oblique direction, the light from each LED 17 is locally localized. Therefore, it is possible to prevent such bright spots from being visually recognized so as to be intermittently arranged following the arrangement pattern of the LEDs 17. In addition, the light reflected by the light shielding part 22 is directly incident on the light incident surface 19b by being directly incident on the light incident surface 19b or repeatedly reflected between the light source reflection sheet 20 and the light incident surface 19b. .

In addition, the light-shielding portion 22 extends along the arrangement direction of the LEDs 17 with a constant width, and includes a light source arrangement area LA that is an arrangement pattern of the LEDs 17 and a light source non-arrangement area LN that is a non-arrangement pattern of the LEDs 17. Since it is configured to cross over the entire region, even when the relative positional relationship in the X-axis direction with respect to the LED 17 is slightly changed when the light transmissive member 15 and the light shielding portion 22 are assembled, The positional relationship in which the light shielding portion 22 overlaps in the X-axis direction with respect to each LED 17 (light source arrangement area LA) is always maintained. Thereby, the light which goes to diagonally front side rather than the light-incidence surface 19b from each LED17 can be reliably interrupted | blocked by the light-shielding part 22. FIG. In addition, since the light shielding portion 22 has a horizontally long rectangular shape that does not have an uneven shape, it is difficult to cause a situation such as being caught by another member during assembly.

Furthermore, since the light shielding portion 22 is provided on the diffusion sheet 15a closest to the light guide plate 19 among the plurality of light transmissive members 15, and is attached to the surface on the light guide plate 19 side, Light enters the end portion on the LED 17 side of each prism sheet 15b and the reflective polarizing sheet 15c laminated on the front side of the diffusion sheet 15a, or enters each gap that may occur between the laminated light transmissive members 15. Or entering a gap that may occur between the diffusion sheet 15a and the light guide plate 19, respectively. Further, since the light shielding portion 22 is disposed in a range extending across the light incident surface 19b and extending from the LED 17 side to the light emitting surface 19a side of the light guide plate 19, light is emitted from each LED 17 at the end portion of the light guide plate 19 on the LED 17 side. The light incident on the incident surface 19b is prevented from being emitted as it is from the light emitting surface 19a without hitting an interface with the other outside of the light guide plate 19. With these configurations, the bright spot that follows the light source arrangement area LA is more difficult to be visually recognized.

In addition, as shown in FIG. 5, the light shielding unit 22 includes a low light reflectance unit 23 that follows the light source arrangement area LA that is the arrangement pattern of the LEDs 17 and a high light that follows the light source non-placement area LN that is the non-placement pattern of the LEDs 17. Since the light is emitted from each of the LEDs 17 and travels toward the light shielding unit 22, the light existing in the light source arrangement area LA that tends to have a relatively large amount of light is emitted from the LED 17. While the light is suppressed by the light source 23, the light in the light source non-arrangement region LN, which tends to have a relatively small amount of light, is highly reflected by the high light reflectance portion 24. Therefore, the difference between the light source arrangement area LA and the light source non-arrangement area LN hardly occurs in the incident light quantity on the light incident surface 19b and the light quantity in the light guide plate 19. Thereby, even when the observer views the light exit surface 19a of the light guide plate 19 from an oblique direction or from the front direction, luminance unevenness is less likely to occur.

As described above, the backlight device (illumination device) 12 of the present embodiment is arranged to face the LEDs 17 and the plurality of LEDs 17 (light sources) that are intermittently arranged side by side, and light from the LEDs 17 is incident thereon. A light guide plate 19 having a light incident surface 19b and a light exit surface 19a for emitting incident light, and at least a part of the light exit surface 19a of the light guide plate 19 and being arranged to cover the light exit surface 19a. A light-transmitting member 15 that transmits light, and provided on the light-transmitting member 15, is disposed at least closer to the LED 17 than the light incident surface 19b, and is disposed at least following the arrangement pattern of the LEDs 17 (light source arrangement area LA). And a light shielding part 22 that shields light from the LED 17.

In this way, the light emitted from the plurality of LEDs 17 is incident on the light incident surface 19b arranged to face the LEDs 17, and then propagates through the light guide plate 19 before being emitted from the light emitting surface 19a. The The light emitted from the light emitting surface 19 a is emitted to the outside by being transmitted through the light transmissive member 15. By the way, a part of the light emitted from each LED 17 is directly incident on, for example, an end of the light transmissive member 15 on the LED 17 side, or in a gap that may be generated between the light guide plate 19 and the light transmissive member 15. By entering, there is a possibility that the light is emitted to the outside without entering the light incident surface 19 b of the light guide plate 19.

In that respect, in the present embodiment, the light from each LED 17 is blocked by the light shielding portion 22 provided on the light transmissive member 15 and disposed at least on the LED 17 side from the light incident surface 19b. Can be prevented from being emitted outside without entering the light incident surface 19b. Thereby, for example, when the light emitting surface 19 a of the light guide plate 19 is viewed from an oblique direction, it is difficult for the light from each LED 17 to be directly recognized without passing through the light guide plate 19. In addition, since the light shielding portion 22 is arranged at least following the arrangement pattern of the LEDs 17, when the light emitting surface 19 a is viewed from an oblique direction, the light from each LED 17 is visually recognized as a bright spot that follows the arrangement pattern of the LEDs 17. Brightness unevenness can be made difficult to occur. In addition, since the light shielding portion 22 is provided on the light transmissive member 15, the workability associated with assembly is excellent. According to this embodiment, luminance unevenness can be suppressed.

Further, a plurality of light transmissive members 15 are arranged in a stacked manner, and the light shielding portion 22 is arranged on the light transmissive member 15 (diffusion sheet 15 a) closest to the light guide plate 19 among the plurality of light transmissive members 15. Is provided. In this way, there is a possibility that a gap is generated between the plurality of light transmissive members 15 stacked on each other, and light from the LED 17 enters the gap and enters the light incident surface 19b without entering the light incident surface 19b. Although it may be emitted, in this embodiment, the light shielding portion 22 provided on the light transmissive member 15 closest to the light guide plate 19 among the plurality of light transmissive members 15 prevents light from entering the gap. Can do. Thereby, it can prevent more reliably that the light from LED17 radiate | emits outside, without entering into the light-incidence surface 19b of the light-guide plate 19. FIG.

Further, the light shielding portion 22 is disposed on the surface on the light guide plate 19 side among the surface on the other light transmissive member 15 side and the surface on the light guide plate 19 side in the light transmissive member 15. If it does in this way, it can prevent by the light shielding part 22 that the light from LED17 enters into the edge part by the side of LED17 in the light transmissive member 15 in which the light shielding part 22 was provided. Thereby, it can prevent more reliably that the light from LED17 is radiate | emitted outside, without entering into the light-incidence surface 19b of the light-guide plate 19. FIG.

In addition to being arranged on the LED 17 side with respect to the light incident surface 19b, the light shielding portion 22 is disposed on the opposite side to the LED 17 side with respect to the light incident surface 19b and at the end portion on the LED 17 side of the light guide plate 19 And superimposed on a plane. At the end of the light guide plate 19 on the LED 17 side, the light from the LED 17 incident on the light incident surface 19b may be emitted as it is from the light exit surface 19a without hitting the other surface of the light guide plate 19. There is a possibility that the incident light is visually recognized as a bright spot when the light emitting surface 19a is viewed from an oblique direction. In this regard, in the present embodiment, the light shielding portion 22 is disposed on the opposite side of the light incident surface 19b from the LED 17 side, and overlaps the light guide plate 19 with the end portion on the LED 17 side in a plan view. At the end of the light plate 19 on the LED 17 side, the light from the LED 17 incident on the light incident surface 19b can be prevented from being emitted as it is from the light emitting surface 19a without hitting the other surface of the light guide plate 19. As a result, luminance unevenness in which bright spots that follow the arrangement pattern of the LEDs 17 are visually recognized is further less likely to occur.

Further, the light shielding portion 22 is arranged following the non-arrangement pattern (light source non-arrangement region LN) of the LED 17 in addition to the arrangement pattern of the LED 17. In this way, even if the positional relationship between the light shielding unit 22 and the LED 17 is shifted in the arrangement direction of the LEDs 17, the light shielding unit 22 arranged following the non-arrangement pattern of the LEDs 17 in addition to the arrangement pattern of the LED 17. Thus, the light from each LED 17 can be reliably blocked. Thereby, luminance unevenness can be made more difficult to occur.

Further, the light shielding portion 22 has a constant width and extends along the arrangement direction of the LEDs 17. In this way, since the shape of the light-shielding part 22 is simple, the manufacturing cost for the light-shielding part 22 is reduced, and it is difficult to be caught on other members and the like, and the handleability is excellent.

The light shielding portion 22 has light reflectivity for reflecting light, and follows the arrangement pattern of the LED 17. The light reflection portion 23 has a relatively low light reflectance and follows the non-arrangement pattern of the LED 17. The high light reflectance portion 24 having a relatively high light reflectance. In this way, the light emitted from each LED 17 toward the light shielding portion 22 is suppressed from being reflected by the low light reflectance portion 23 that follows the arrangement pattern of the LED 17, whereas the high light that follows the non-arrangement pattern of the LED 17. The reflection part 24 increases the efficiency of reflection. Therefore, unevenness due to the arrangement pattern and the non-arrangement pattern of the LEDs 17 is less likely to occur in the light amount in the light guide plate 19 incident from the light incident surface 19b. Thereby, even when the light emitting surface 19a of the light guide plate 19 is viewed obliquely or when viewed from the front, the luminance unevenness becomes difficult to be visually recognized.

Further, the light shielding portion 22 is a separate component from the light transmissive member 15 and is attached to the light transmissive member 15. In this way, by making the light shielding portion 22 a separate component from the light transmissive member 15, it is possible to use the general-purpose light transmissive member 15, so the cost associated with the light transmissive member 15 can be reduced. It can be kept low.

Further, the light shielding portion 22 is made of a reflecting member that reflects light. In this way, since a general-purpose reflecting member can be used as the light shielding part 22, the cost related to the light shielding part 22 can be kept low.

As mentioned above, although Embodiment 1 of this invention was shown, this invention is not restricted to the said embodiment, For example, the following modifications can also be included. In the following modifications, members similar to those in the above embodiment are denoted by the same reference numerals as those in the above embodiment, and illustration and description thereof may be omitted.

[Modification 1 of Embodiment 1]
A first modification of the first embodiment will be described with reference to FIGS. Here, the light reflectance distribution of the low light reflectance portion 23-1 in the light shielding portion 22-1 is changed.

As shown in FIG. 8, the low light reflectance portion 23-1 provided in the light shielding portion 22-1 according to this modification changes its light reflectance in a gradation shape in the LED 17 arrangement direction (X-axis direction). It is supposed to be configured. Specifically, as shown in FIGS. 8 and 10, the low light reflectance portion 23-1 has a light reflectance that gradually increases gradually in the direction away from the center position of the LED 17 in the X-axis direction. On the contrary, the light reflectivity is continuously reduced gradually toward the direction closer to the center position of the LED 17. Therefore, the large number of dots 23a-1 constituting the low light reflectance portion 23-1 are arranged at the center position of the LED 17 in the X-axis direction, as shown in FIG. The pattern is formed so that the area continuously decreases gradually as the distance from the X-axis direction increases. The light reflectance in the low light reflectance portion 23-1 changes in a slope shape in the X-axis direction. Note that the light reflectance in the low light reflectance portion 23-1 is substantially constant in the Y-axis direction.

As described above, according to the present modification, the low light reflectance portion 23-1 is configured such that the light reflectance increases toward the direction away from the center position of the LEDs 17 in the arrangement direction of the LEDs 17. The amount of light in the light guide plate 19 is the highest in the center position of the LEDs 17 in the direction in which the LEDs 17 are arranged, and tends to decrease in the direction away from the LED 17. Therefore, the low light reflectance portion 23-1 that follows the arrangement pattern of the LEDs 17 By making the light reflectance in the above as described above, the light quantity in the light guide plate 19 becomes more uneven.

[Modification 2 of Embodiment 1]
A second modification of the first embodiment will be described with reference to FIG. Here, the light reflectance distribution of the low light reflectance portion 23-2 is further changed from the first modification of the first embodiment described above.

As shown in FIG. 11, the light reflectance of the low light reflectance portion 23-2 according to this modification changes in a curved shape in the arrangement direction (X-axis direction) of the LEDs 17.

[Modification 3 of Embodiment 1]
A third modification of the first embodiment will be described with reference to FIG. Here, the light reflectance distribution of the low light reflectance portion 23-3 is further changed from the first and second modifications of the first embodiment.

As shown in FIG. 12, the low light reflectance portion 23-3 according to the present modification is configured such that the light reflectance changes in a stripe shape in the arrangement direction (X-axis direction) of the LEDs 17. That is, the low light reflectivity unit 23-3 gradually increases in light reflectivity stepwise toward the direction away from the center position of the LED 17 in the X-axis direction, and conversely, light is directed toward the direction approaching the center position of the LED 17. The reflectance is gradually decreased step by step.

[Modification 4 of Embodiment 1]
A fourth modification of the first embodiment will be described with reference to FIG. Here, what changed the structure of the low light reflectance part 23-4 in the light-shielding part 22-4 is shown.

As shown in FIG. 13, the low light reflectance portion 23-4 according to the present modification is formed by printing a low light reflectance material in a solid shape on the surface of the light shielding portion 22-4. In this way, the light reflectance of the low light reflectance portion 23-4 is even lower than those described in the first embodiment and the first to third modifications thereof.

[Modification 5 of Embodiment 1]
Modification 5 of Embodiment 1 will be described with reference to FIG. Here, what changed the shape of the low light reflectance part 23-5 from the modification 4 of above-mentioned Embodiment 1 is shown.

The low light reflectivity portion 23-5 according to the present modification has a trapezoidal shape when seen in a plane as shown in FIG. Of the trapezoidal low light reflectance portion 23-5, a pair of opposite sides are parallel to the LED 17 arrangement direction (X-axis direction), of which the upper base is on the LED 17 side and the lower base is opposite to the LED 17 side. It is arranged on the side. That is, the low light reflectivity portion 23-5 is configured such that the dimension in the X-axis direction gradually increases toward the direction away from the LED 17 in the Y-axis direction. Further, the low light reflectance portion 23-5 has a symmetrical shape with the center position of the LED 17 as the center in the X-axis direction, and the angles formed by the pair of oblique sides with respect to the Y-axis direction are equal to each other. .

[Modification 6 of Embodiment 1]
Modification 6 of Embodiment 1 will be described with reference to FIG. Here, what changed the attachment position of the light-shielding part 22-6 with respect to the light transmissive member 15-6 is shown.

As shown in FIG. 15, the light-shielding portion 22-6 according to this modification is a front-side surface of the light transmissive member 15-6 (diffusion sheet 15 a-6) closest to the light guide plate 19, that is, the light guide plate 19. It is attached to the surface opposite to the side. Even in such a configuration, the light from the LEDs 17 is laminated on the front side with respect to the diffusion sheet 15a-6 by the light shielding portion 22-6, and the LED 17 side in the reflective polarizing sheet 15c is reflected on the prism sheet 15b. It is possible to restrict entry into the gaps that may occur between the end portions and the light transmissive members 15 where the light shielding portions 22-6 are not provided.

[Modification 7 of Embodiment 1]
A seventh modification of the first embodiment will be described with reference to FIGS. 16 and 17. Here, what changed the magnitude | size of the light-shielding part 22-7 and the light transmissive member 15-7, the formation range of the low light reflectance part 23-7, etc. is shown.

As shown in FIGS. 16 and 17, the light transmissive member 15-7 according to this modification is a position in which the end surface on the LED 17 side is retracted to the side opposite to the LED 17 side than the light incident surface 19 b of the light guide plate 19. The size is such that Thereby, it becomes difficult for the light from LED17 to inject more directly with respect to the edge part by the side of LED17 in each light transmissive member 15-7. The light shielding portion 22-7 attached to the diffusion sheet 15a-7, which is the light transmissive member 15-7 having the above size, covers most of the LEDs 17 (a majority region including the main light emitting surface) from the front side. It is made the size. Thereby, the light emitted from the LED 17 becomes more difficult to be incident on the end portion on the LED 17 side in each of the light transmissive members 15-7, and thus uneven luminance can be more effectively suppressed. Specifically, the light shielding portion 22-7 has a size such that the end surface on the LED 17 side is located between the main light emitting surface of the LED 17 (the surface facing the light incident surface 19b) and the mounting surface of the LED 17 on the LED substrate 18. It is assumed. Thereby, when performing the operation | work which mounts the diffusion sheet 15a-7 on the light-guide plate 19, the edge part of the light shielding part 22-7 becomes difficult to interfere with the mounting surface of LED17 in the LED board 18, and therefore the light shielding part 22 is carried out. -7 is prevented from being deformed. The effects described above can be obtained in the same manner when thermal expansion occurs in the diffusion sheet 15a-7 and the light shielding portion 22-7. As shown in FIG. 16, the low light reflectance portion 23-7 has a linear base that coincides with the end face of the light shielding portion 22-7 on the opposite end to the LED 17 side. On the other hand, although the curved semicircular arc portion intersects the end portion on the LED 17 side of the light transmitting member 15-7, it does not intersect the light incident surface 19b of the light guide plate 19 (more than the light incident surface 19b). (Retracted to the opposite side of the LED 17 side). Note that the configuration according to this modification described above can also be applied to those described in Modification 1 to Modification 6 of Embodiment 1.

<Embodiment 2>
A second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, a configuration in which the configuration of the light shielding unit 122 is changed is shown. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

In the light shielding portion 122 according to the present embodiment, as shown in FIG. 18, an opening 25 having a shape following the light source non-arrangement region LN that is a non-arrangement pattern of the LEDs 17 is formed in a cutout manner. Therefore, the light shielding part 122 left by cutting out the opening 25 is configured to follow the light source arrangement area LA which is the arrangement pattern of the LEDs 17. Specifically, the light shielding part 122 is compared with the second part 122b in which the first part 122a disposed on the LED 17 side of the light incident surface 19b of the light guide plate 19 overlaps the light guide plate 19 in a plan view. The width dimension (dimension in the Y-axis direction) is relatively large. The first portion 122a is sized so that the end portion on the LED 17 side is located between the main light emitting surface of the LED 17 (the surface facing the light incident surface 19b) and the mounting surface of the LED 17 on the LED substrate 18. . The opening 25 is formed in the first portion 122a of the light shielding portion 122 and is opened toward the LED substrate 18 side. A plurality of the openings 25 are intermittently arranged in parallel along the alignment direction (X-axis direction) of the LEDs 17. The openings 25 are in a positional relationship that does not overlap with the LEDs 17 in the X-axis direction, and all exist in the light source non-arrangement region LN. The light shielding portion 122 in which the opening 25 having such a configuration is formed has a comb-like shape that is horizontally long when seen in a plan view. A portion of the light shielding portion 122 that is adjacent to the opening 25 in the X-axis direction is a convex portion 26 that protrudes from the back end position of the opening 25 toward the LED 17. Both the convex part 26 and the opening part 25 form a trapezoidal shape when seen in a plane, and the opposite sides of each pair are parallel to the LED 17 arrangement direction (X-axis direction). The opening 25 has an opening width that increases as it approaches the LED substrate 18 in the Y-axis direction, whereas the convex portion 26 has a width that tapers as it approaches the LED substrate 18 in the Y-axis direction. There is no. The convex portion 26 has a width dimension at the protruding tip portion larger than that of the LED 17, and is disposed so as to overlap the entire area of the LED 17 in a plan view. In addition, about the position of the end surface by the side of LED17 in the light transmissive member 115, the structure described in the modification 7 of Embodiment 1 mentioned above is applied, and it is opposite to the LED17 side rather than the light-incidence surface 19b of the light-guide plate 19. It is possible to make the position retracted to the side.

The operation according to this embodiment will be described. Of the light from each LED 17, most of the light traveling obliquely to the front side with respect to the light incident surface 19 b is largely due to the light shielding portion 122 (convex portion 26) that follows the light source arrangement area LA, as shown in FIGS. 18 and 19. It is suppressed that it is visually recognized as a bright spot by being blocked. On the other hand, as shown in FIGS. 18 and 20, a part of the light traveling obliquely to the front side from the light incident surface 19b is not passed through the light guide plate 19 through the opening 25 following the light source non-arrangement region LN. It is emitted to the outside. Here, as compared with the case where the light-shielding portion 22 does not have the opening 25 as in the first embodiment and is configured to follow the light source non-arrangement region LN in addition to the light source arrangement region LA, the light shielding is performed. Since the amount of light absorbed by the portion 122 is relatively small, it is difficult for a difference in the amount of light emitted to the outside between the light source placement area LA and the light source non-placement area LN, thereby reducing luminance unevenness. it can. The opening 25 follows the light source non-arrangement area LN, which has a relatively small amount of light compared to the light source arrangement area LA, so that light emitted to the outside through the opening 25 is almost visually recognized as a bright spot. There is no.

As described above, according to the present embodiment, the light shielding portion 122 has the opening 25 that follows the non-arrangement pattern of the LEDs 17. The light from each LED 17 toward the end portion on the LED 17 side of the light transmissive member 115 is suppressed from being visually recognized as a bright spot by being largely blocked by the light shielding portion 122 that follows the arrangement pattern of the LED 17. On the other hand, a part is emitted outside through the light guide plate 19 through the opening 25 following the non-arrangement pattern of the LED 17. Here, as compared with a case where the light shielding portion is also configured to follow the non-arrangement pattern of the LED 17, the amount of light absorbed by the light shielding portion 122 is relatively small. Differences in the amount of light emitted to the outside are less likely to occur, whereby luminance unevenness can be reduced. In addition, since the opening part 25 is a mode that follows the non-arrangement pattern of the LED 17 having a relatively small amount of light compared to the arrangement pattern of the LED 17, the light emitted to the outside through the opening part 25 is almost visually recognized as a bright spot. There is nothing.

As mentioned above, although Embodiment 2 of this invention was shown, this invention is not restricted to the said embodiment, For example, the following modifications can also be included. In the following modifications, members similar to those in the above embodiment are denoted by the same reference numerals as those in the above embodiment, and illustration and description thereof may be omitted.

[Modification 1 of Embodiment 2]
A first modification of the second embodiment will be described with reference to FIG. Here, a configuration obtained by further changing the configuration of the light shielding unit 122-1 is shown.

As shown in FIG. 21, the light-shielding portion 122-1 according to the present modification has a configuration in which the surface is black. Specifically, the light shielding unit 122-1 is assumed to exhibit a uniform density of black over the entire surface, and the light reflectance thereof is compared with the

light shielding units

22 and 122 described in the first and second embodiments. , Relatively low. The light shielding unit 122-1 has a relatively higher light absorption rate than the light reflectance. According to such a configuration, the light emitted from each LED 17 can be absorbed by the convex portion 26-1 arranged following the light source arrangement area LA that is the arrangement pattern of the LEDs 17. Thereby, it is possible to suppress the amount of light that tends to be excessive in the light source arrangement area LA, and to reduce the difference in light quantity that occurs between the light source non-arrangement area LN, so that the observer can emit the light exit surface of the light guide plate 19. Even when the 19a is viewed from an oblique direction or a front direction, the luminance unevenness is hardly visually recognized.

[Modification 2 of Embodiment 2]
A second modification of the second embodiment will be described with reference to FIG. 22 or FIG. Here, the shape of the opening 25-2 is changed.

As shown in FIGS. 22 and 23, the opening 25-2 according to the present modification is not opened toward the LED substrate 18 side, but only in the thickness direction (Z-axis direction) of the light shielding portion 122-2. It has a hole shape that opens. Specifically, the opening 25-2 has an oblong shape that is horizontally long when seen in a plan view, so that the LED 17 side (LED substrate 18 side) end of the light shielding portion 122-2 remains over the entire length. . In this way, since the concave and convex portions do not occur in the outer shape of the light shielding portion 122-2, it is difficult to cause a problem of being caught by other members during assembly.

<Embodiment 3>
A third embodiment of the present invention will be described with reference to FIGS. In the third embodiment, the light shielding part 222 is integrally formed with the light transmissive member 215. 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. 24 to 27, the diffusion sheet 215 a closest to the light guide plate 19 among the light transmissive members 215 according to the present embodiment has the LED 17 side end portion closer to the LED 17 than the light incident surface 19 b of the light guide plate 19. It is set as the form which protrudes toward the side, and this is made into the protrusion part 27 here. In the diffusion sheet 215a, an end portion on the LED 17 side including the protruding portion 27 is integrally formed with a light shielding portion 222 by printing a material having at least a certain light shielding property on the surface thereof. Specifically, the light shielding part 222 is provided by printing different materials on the front and back main surfaces of the diffusion sheet 215a, and the first light shielding part 28 provided on the front main surface and the back main surface. The second light shielding portion 29 is provided. Among these, as shown in FIGS. 24, 26 and 27, the first light-shielding portion 28 is made of a material exhibiting black color, and has a certain width and extends along the parallel direction (X-axis direction) of the LEDs 17. It is formed in a square shape. The first light-shielding portion 28 is arranged in a range extending across the light incident surface 19b and extending to the LED 17 side and the opposite side (light emitting surface 19a side). Since the surface of the first light-shielding portion 28 exhibits a black color, it can absorb almost all of the irradiated light and has a high light-shielding property.

On the other hand, as shown in FIGS. 25 to 27, the second light-shielding portion 29 is made of a white material, and is formed in a horizontally long comb-teeth shape extending in the X-axis direction when viewed in a plane. Since the surface of the second light-shielding portion 29 is white, it can substantially reflect the irradiated light and has a high light-shielding property. The second light shielding part 29 can transmit a slight amount of light, and has a relatively low light shielding rate (light shielding property) compared to the first light shielding part 28. The second light-shielding portion 29 is formed in a comb-teeth shape as viewed from above by providing a plurality of notches 29a intermittently parallel in the X-axis direction at the end opposite to the LED 17 side. ing. And each notch 29a is arranged in the position which overlaps with each LED17 about the direction of an X-axis, and is made into the form which follows the light source arrangement area LA which is the arrangement pattern of LED17 by it. Each notch 29a has a trapezoidal shape when seen in a plane, and its width dimension (dimension in the X-axis direction) becomes smaller as it approaches the LED 17. Although light is transmitted through the notch 29a toward the diffusion sheet 215a, the transmitted light is transmitted by the first light-shielding unit 28 formed on the main surface on the front side of the diffusion sheet 215a. It is shielded (see particularly FIG. 26). The first light-shielding portion 28 has a black surface, and has a relatively low light reflectance and a relatively high light absorption rate and light-shielding rate as compared with the second light-shielding portion 29. Most of the light passed through 29a is absorbed. Accordingly, the light reflectance at the light shielding portion 222 (the end portion on the LED 17 side of the diffusion sheet 215a) varies depending on the cutout portion 29a, and the portion where the cutout portion 29a is formed is relatively light reflective. The low light reflectance portion 223 is low, whereas the non-formed portion of the notch 29a is the high light reflectance portion 224 having a relatively high light reflectance. The low light reflectance part 223 is configured to follow the light source arrangement area LA, while the high light reflectance part 224 is configured to follow the light source non-arrangement area LN. The light shielding unit 222 having the above-described configuration can block light from each LED 17 toward the oblique front side from the light incident surface 19b, suppress reflection in the light source arrangement area LA where the light amount tends to be excessive, and reduce the light amount. By improving the reflection efficiency in the light source non-arrangement region LN that tends to be insufficient, luminance unevenness can be prevented as in the first embodiment.

As described above, according to the present embodiment, the light transmissive member 215 is configured such that the end portion on the LED 17 side protrudes to the LED 17 side from the light incident surface 19b, and the light shielding portion 222 is light transmissive. The member 15 is integrally formed with the end portion on the LED 17 side. In this way, the handleability of the light shielding part 222 and the light transmissive member 215 is excellent.

Further, the light shielding part 222 is formed by printing a light shielding material on the surface of the light transmissive member 215. In this way, the degree of freedom in designing the light shielding unit 222 can be increased.

As mentioned above, although Embodiment 3 of this invention was shown, this invention is not restricted to the said embodiment, For example, the following modifications can also be included. In the following modifications, members similar to those in the above embodiment are denoted by the same reference numerals as those in the above embodiment, and illustration and description thereof may be omitted.

[Modification 1 of Embodiment 3]
A first modification of the third embodiment will be described with reference to FIG. 28 or FIG. Here, the first light-shielding part 28-1 and the second light-shielding part 29-1 constituting the light-shielding part 222-1 are stacked on the same surface of the light transmitting member 215-1.

As shown in FIGS. 28 and 29, the light-shielding part 222-1 according to the present modification is relative to the main surface on the back side (light guide plate 19 side) of the pair of front and back main surfaces of the light transmissive member 215-1. The first light-shielding portion 28-1 and the second light-shielding portion 29-1 are stacked and formed. Specifically, the first light-shielding part 28-1 whose surface is black first is formed on the main surface on the back side of the light-transmitting member 215-1 by printing, and then the first light-shielding part 28-1 with respect to the first light-shielding part 28-1 A second light-shielding portion 29-1 having a white surface and having a notch 29a-1 is formed by printing so as to be laminated on the back side. As described above, the first light-shielding portion 28-1 and the second light-shielding portion 29-1 are printed twice on the light-transmissive member 215-1. Even with such a configuration, the same operations and effects as those of the third embodiment described above can be obtained.

[Modification 2 of Embodiment 3]
A second modification of the third embodiment will be described with reference to FIGS. 30 and 31. FIG. Here, the size of the light transmissive member 215-2, the formation range of the light shielding portion 222-2, and the like are changed.

As shown in FIGS. 30 and 31, each of the prism sheets 215b-2 and the reflective polarizing sheet 215c-2 that do not have the light shielding portion 222-2 is included in the light transmissive member 215-2 according to this modification example. The end surface on the LED 17 side is sized so as to be a position retracted to the opposite side of the LED 17 side from the light incident surface 19 b of the light guide plate 19. As a result, the light from the LED 17 is less likely to be directly incident on the end portion on the LED 17 side of each prism sheet 215b-2 and the reflective polarizing sheet 215c-2. On the other hand, in the light transmissive member 215-2, the diffusion sheet 215 a-2 having the light shielding part 222-2 is such that the portion protruding from the light incident surface 19 b of the light guide plate 19 toward the LED 17 side is the majority of the LED 17 (mainly It has a size so as to cover the majority region including the light emitting surface from the front side, and a light shielding portion 222-2 is integrally formed there. As a result, the light emitted from the LED 17 is less likely to be incident on the end portion on the LED 17 side of each prism sheet 215b-2 and the reflective polarizing sheet 215c-2, thereby suppressing luminance unevenness more effectively. Can do. Specifically, the diffusion sheet 215a-2 has a size such that the end surface on the LED 17 side is located between the main light emitting surface of the LED 17 (the surface facing the light incident surface 19b) and the mounting surface of the LED 17 on the LED substrate 18. It is assumed. As a result, when performing the operation of placing the diffusion sheet 215a-2 on the light guide plate 19, the end portion on the LED 17 side is less likely to interfere with the mounting surface of the LED 17 on the LED substrate 18, and thus the diffusion sheet 215a-2 and It is possible to prevent deformation or the like from occurring in the light shielding portion 222-2. The effects described above can be obtained in the same manner when thermal expansion occurs in the diffusion sheet 215a-2.

The light shielding portion 222-2 has an end surface on the LED 17 side that is flush with the same end surface of the diffusion sheet 215 a-2, whereas an end surface on the opposite side to the LED 17 side has each prism sheet 215 b-2 and the reflection type. The polarizing sheet 215c-2 is located on the opposite side of the LED 17 side from the end face on the LED 17 side. That is, a part of the light shielding part 222-2 overlaps with the end part on the LED 17 side in each prism sheet 215 b-2 and the reflective polarizing sheet 215 c-2 in a plan view. The notch 29a-2 formed in the second light-shielding part 29-2 constituting the light-shielding part 222-2 is such that the end face on the LED 17 side is located on the opposite side of the light incident surface 19b of the light guide plate 19 from the LED 17 side. is doing.

[Modification 3 of Embodiment 3]
A third modification of the third embodiment will be described with reference to FIGS. 32 and 33. FIG. Here, the size of the light transmitting member 215-3 and the formation range of the light shielding portion 222-3 are changed from the first modification of the third embodiment, and the same as the second modification of the third embodiment described above. Indicates. Therefore, the description of the operation and effect overlapping with those of the first and second modifications of the third embodiment is omitted.

Of the light transmissive member 215-3 according to the present modification, each prism sheet 215b-3 and reflective polarizing sheet 215c-3 not having the light shielding portion 222-3 are as shown in FIGS. The end surface on the LED 17 side is sized so as to be a position retracted to the opposite side of the LED 17 side from the light incident surface 19 b of the light guide plate 19. On the other hand, in the light transmissive member 215-3, the diffusion sheet 215 a-3 having the light shielding part 222-3 is such that the portion protruding from the light incident surface 19 b of the light guide plate 19 toward the LED 17 side is the majority of the LED 17 (mainly It has a size so as to cover a majority region including the light emitting surface from the front side, and a light shielding portion 222-3 is integrally formed there. The diffusion sheet 215a-3 has a size such that the end surface on the LED 17 side is located between the main light emitting surface of the LED 17 (the surface facing the light incident surface 19b) and the mounting surface of the LED 17 on the LED substrate 18. Is done. In the light shielding part 222-3, the end surface on the LED 17 side is flush with the same end surface of the diffusion sheet 215a-3, whereas the end surface opposite to the LED 17 side is the prism sheet 215b-3 and the reflection type. The polarizing sheet 215c-3 is located further on the opposite side than the LED 17 side than the end face on the LED 17 side. The notch 29a-3 formed in the second light-shielding part 29-3 constituting the light-shielding part 222-3 is such that the end face on the LED 17 side is located on the side opposite to the LED 17 side from the light incident surface 19b of the light guide plate 19 is doing.

[Modification 4 of Embodiment 3]
A fourth modification of the third embodiment will be described with reference to FIGS. Here, what changed the shape of the light-shielding part 222-4 from the modification 2 of above-mentioned Embodiment 3 is shown.

As shown in FIGS. 34 to 36, the first light-shielding part 28-4 constituting the light-shielding part 222-4 according to the present modification includes a plurality of intermittently parallel X-axis directions at the end portion on the LED 17 side. The cutout portion 28a is provided, so that the whole is formed in a comb-teeth shape. Each notch 28a is arranged at a position that does not overlap with each LED 17 in the X-axis direction, and is thus configured to follow the light source non-arrangement region LN that is a non-arrangement pattern of the LED 17. In other words, the first light shielding portion 28-4 is configured to follow the light source arrangement area LA which is the arrangement pattern of the LEDs 17. Each notch 28a has a trapezoidal shape when seen in a plane, and its width dimension (dimension in the X-axis direction) increases as it approaches the LED 17. Each notch 28 a has an end surface on the side opposite to the LED 17 side located on the side opposite to the LED 17 side from the light incident surface 19 b of the light guide plate 19.

By the way, the second light-shielding portion 29-4 having a white surface substantially reflects the light from the LED 17, but has an optical characteristic capable of transmitting a predetermined amount of light, and a part of the second light-shielding portion 29-4 in the light source non-arrangement region LN. The light shielding part 28-4 is arranged so as to overlap with the cutout part 28a of the light shielding part 28-4 in a plan view. Accordingly, in the light source non-arrangement region LN, the light traveling from the LED 17 toward the oblique front side with respect to the light incident surface 19b is slightly transmitted through the second light shielding portion 29-4, as shown in FIG. The light is emitted to the outside through the notch 28a through the diffusion sheet 215a-4 without passing through the light guide plate 19. Here, as compared with the case where the first light-shielding portion 28-2 having a black surface as in the second modification of the third embodiment described above does not have the cutout portion 28a, the light source non-arrangement region LN Since the amount of light absorbed by the first light-shielding portion 28-4 is relatively small, a difference in the amount of light emitted to the outside hardly occurs between the light source arrangement area LA and the light source non-arrangement area LN. Thereby, luminance unevenness can be reduced.

[Modification 5 of Embodiment 3]
A fifth modification of the third embodiment will be described with reference to FIGS. Here, what changed the shape of the light-shielding part 222-5 from the modification 2 of above-mentioned Embodiment 3 is shown.

As shown in FIGS. 37, 39, and 40, the first light-shielding portion 28-5 that constitutes the light-shielding portion 222-5 according to the present modification is a notch portion that is substantially the same as the modification 4 of the third embodiment described above. 28a-5, so that the whole is formed in a comb-like shape. The cutout portion 28a-5 is the fourth modification of the third embodiment described above, except that the end surface opposite to the LED 17 side is located closer to the LED 17 than the light incident surface 19b of the light guide plate 19. Since it is the same structure as, overlapping explanation is omitted. On the other hand, as shown in FIGS. 38 to 40, the second light-shielding part 29-5 has notches 29a-5 and 29b at the end opposite to the LED 17 side and the end on the LED 17 side, respectively. Yes. Specifically, the first notch 29a-5 formed at the end of the second light shielding part 29-5 opposite to the LED 17 side is the notch 29a described in the second modification of the third embodiment. The configuration is the same as that of -2. Therefore, the description which overlaps about the 1st notch part 29a-5 is omitted. The second cutout portion 29b formed at the end portion on the LED 17 side of the second light shielding portion 29-5 is arranged at a position where it does not overlap with each LED 17 in the X-axis direction, and thereby the non-arrangement pattern of the LED 17 The light source non-arrangement region LN is followed. Each second notch 29b has a trapezoidal shape when seen in a plane, and its width dimension (dimension in the X-axis direction) increases as it approaches the LED 17. Each second notch 29b has an end surface opposite to the LED 17 side located on the side opposite to the LED 17 side from the light incident surface 19b of the light guide plate 19.

And each 2nd notch part 29b is distribute | arranged to the position which overlaps with the notch part 28a-5 formed in the 1st light-shielding part 28-5 seeing in a plane. Specifically, the notch 28a-5 and the second notch 29b have a size and a positional relationship that are substantially aligned when viewed in a plane. Accordingly, in the light source non-arrangement region LN, the light from the LED 17 that travels obliquely to the front side with respect to the light incident surface 19b is, as shown in FIG. 40, the second cutout portion formed in the second light shielding portion 29-5. After passing through 29b, the light passes through the diffusion sheet 215a-5, and then passes through the cutout portion 28a-5 formed in the first light shielding portion 28-5, so that it is emitted outside without passing through the light guide plate 19. It has come to be. Here, as compared to the case where the first light-shielding portion 28-2 having a black surface as in the second modification of the third embodiment described above does not have a notch, the light source non-arrangement region LN The amount of light absorbed by the first light shield 28-5 is relatively reduced. Furthermore, compared with the above-described modification 4 of the third embodiment, the second light-shielding portion 29-5 is formed with the second notch 29b, so that the amount of transmitted light is relatively increased. Thereby, the difference which may arise in the emitted light quantity to the exterior by the light source arrangement area LA and the light source non-arrangement area | region LN can further be reduced, and brightness irregularity can further be reduced.

[Modification 6 of Embodiment 3]
A sixth modification of the third embodiment will be described with reference to FIG. 41 or FIG. Here, what changed the structure of the light-shielding part 222-6 from the modification 3 of above-mentioned Embodiment 3 is shown.

As shown in FIGS. 41 and 42, the light-shielding part 222-6 according to this modification is a second layer formed on the main surface on the back side of the diffusion sheet 215a-6 (light-transmitting member 215-6). It consists of a light shielding part 29-6 and a first light shielding part 28-6. Specifically, the second light-shielding portion 29-6 having a white surface is formed on the main surface on the back side of the diffusion sheet 215a-6 by printing, and then the back side with respect to the second light-shielding portion 29-6. The first light-shielding portion 28-6 having a black surface is formed by printing so as to be laminated. The second light-shielding part 29-6 is formed in a horizontally long rectangular shape with a constant width and extending along the parallel direction (X-axis direction) of the LEDs 17, and the first light-shielding part described in Embodiment 3 above. The planar shape is the same as 28 (see FIG. 24).

On the other hand, a plurality of first light-shielding portions 28-6 are formed in a form intermittently juxtaposed in the X-axis direction at the end of the second light-shielding portion 29-6 opposite to the LED 17 side. Each first light shielding portion 28-6 is arranged at a position overlapping with each LED 17 in the X-axis direction, and is configured to follow the light source arrangement area LA which is the arrangement pattern of the LEDs 17. Each of the first light-shielding portions 28-6 has a trapezoidal shape when seen in a plan view, and its width dimension (dimension in the X-axis direction) decreases as the LED 17 is approached. 3 is the same as the first cutout portion 29a-5 of the second light shielding portion 29-5 described in the third modified example 5 (see FIG. 38). Therefore, the overlapping description regarding each first light shielding portion 28-6 is omitted. Even if it is the structure like this modification, the effect | action and effect similar to the

modification

1 and 3 of above-mentioned Embodiment 3 can be acquired.

<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 and modifications thereof, the light-shielding portion is configured to be provided on the light transmissive member closest to the light guide plate among the plurality of light transmissive members. You may make it provide a light-shielding part in the light transmissive member arrange | positioned on the opposite side to the light-guide plate side with respect to the light transmissive member near a light plate.

(2) In each of the above-described embodiments and modifications thereof, the light shielding portion has a configuration in which the light shielding portion is arranged in a range extending across the light incident surface and extending from the LED side to the opposite side. It is also possible to adopt a configuration in which the entire region is disposed on the LED side with respect to the light incident surface, and is not disposed on the side opposite to the LED side (light emitting surface side) with respect to the light incident surface.

(3) In the above-described first embodiment and the modifications thereof, the configuration in which the light-shielding portion has a constant width and extends along the LED arrangement direction is shown, but the outer shape of the light-shielding portion is uneven. The present invention also includes a shape that is shaped and does not have a constant width.

(4) In addition to the first embodiment described above and the modifications thereof, the arrangement of the low light reflectance portion in the light shielding portion can be appropriately changed. Specifically, the low light reflectance portion may be arranged only in the first portion of the light shielding portion, or may be arranged in a position straddling the first portion and the second portion. It is also possible to adopt a configuration in which the low light reflectance part is arranged at a position away from both end parts along the X-axis direction in the light shielding part.

(5) In addition to the first embodiment described above and the modifications thereof, the planar shape of the low light reflectance portion can be changed as appropriate. Specifically, the planar shape of the low light reflectance portion can be a divergent shape such as a triangle, a semi-elliptical shape, or a semi-ellipsoidal shape, as well as a polygonal shape (square, pentagon, etc.), a circle It may be a shape, an elliptical shape, or the like. Moreover, it is also possible to make a low light reflectance part into an asymmetrical shape.

(6) In the above-described first embodiment and the modifications thereof, the case where the low light reflectance part is formed by printing the low light reflectance material on the surface of the light shielding part is shown. It is also possible to form the low light reflectance portion by applying a light reflectance material. In addition, the present invention includes other means using other forming means such as metal vapor deposition.

(7) In the above-described first embodiment and each modification thereof, the case where a material exhibiting black is used as the low light reflectance material forming the low light reflectance portion is shown. However, a color other than black (for example, gray) is used. It is also possible to use a low light reflectance material exhibiting

(8) In addition to the first embodiment described above and the modifications thereof, the formation range of the light shielding portion in the Y-axis direction can be changed as appropriate. For example, the LED side end surface of the light shielding portion is positioned so as to be flush with the main light emitting surface of the LED, or the end surface covers a part or the whole of the LED (LED mounting surface and surface on the LED substrate) The present invention also includes a single position, or a position between the main light emitting surface of the LED and the LED mounting surface on the LED substrate. Other than that, the end face of the light-shielding portion opposite to the LED side is the same position as the light incident face, or the end face is a position between the light incident face and the main light emitting face of the LED. What is said is also included in the present invention.

(9) The configuration described in (8) above can be similarly applied to the second embodiment and its modifications, and the third embodiment and its modifications.

(10) Besides the above-described second embodiment and its modifications, the planar shape of the opening in the light-shielding portion can be changed as appropriate. Specifically, the planar shape of the opening may be a semicircular shape, a semi-elliptical shape, a semi-elliptical shape, a triangular shape, or the like, and may be configured to open toward the LED substrate side. In addition, the planar shape of the opening may be a polygonal shape (square, pentagon, etc.), a circular shape, an elliptical shape, or the like that opens only in the thickness direction of the light shielding portion. It is also possible to make the opening asymmetrical.

(11) It is also possible to apply the low light reflectance part described in the first embodiment and each modification thereof to the configuration described in the second embodiment or the second modification thereof.

(12) The opening described in the second embodiment and each of the modifications may be applied to the configuration described in the first embodiment or each of the modifications.

(13) In addition to the above-described third embodiment and the modifications thereof, the first light-shielding portion is provided on the one main surface of the light-transmitting member so as to follow the light source placement region, and the light source non-placement region is followed. The second light-shielding part may be provided in a form that does not overlap with the first light-shielding part in a plan view.

(14) In the above-described third embodiment and the modifications thereof, the case where a material exhibiting black is used as the material forming the first light-shielding portion (low light reflectance material) has been described. Etc.) (low light reflectance material) can also be used. Similarly, a material (high light reflectivity material) exhibiting a color other than white (for example, silver or gray) can be used as the material (high light reflectivity material) forming the second light shielding portion.

(15) In the above-described third embodiment and the modifications thereof, the first light-shielding portion and the second light-shielding portion are printed by printing each material (low light reflectance material and high light reflectance material) on the surface of the light transmissive member. However, it is also possible to form the first light shielding part and the second light shielding part by applying each material (low light reflectance material and high light reflectance material) on the surface of the light transmissive member. It is. In addition, the present invention includes other means using other forming means such as metal vapor deposition.

(16) The configuration in which the light shielding portion described in the third embodiment and each modification thereof is integrally formed with the light transmissive member may be applied to the configuration described in the first embodiment or each modification thereof. Is possible. Similarly, the configuration described in the third embodiment and its modifications can also be applied to the configuration described in the second embodiment or its modifications.

(17) In each of the above-described embodiments, the case where four light transmissive members are used is exemplified, but the number of light transmissive members used is appropriately changed to other than four (three or less, five or more). It is possible. Moreover, the specific kind of the light transmissive member to be used can be changed as appropriate. Further, the positional relationship between the LED-side end surface of the light transmissive member and the light incident surface of the light guide plate can be changed as appropriate. For example, the LED-side end surface of the light transmissive member is more than the light incident surface of the light guide plate. It is also possible to adopt a configuration located on the LED side.

(18) In each of the above-described embodiments, a pair of LED substrates (LEDs) are arranged at the ends of both long sides of the light guide plate. For example, the LED substrates (LEDs) are both short sides of the light guide plate. What is arranged in a pair at the end portion on the side is also included in the present invention.

(19) In addition to the above (18), a pair of LED substrates (LEDs) arranged with respect to the ends of both long sides and short sides of the light guide plate, and conversely LED substrates (LEDs). The present invention includes one in which only one long side or one short side of the light guide plate is disposed at the end.

(20) In each of the above-described embodiments, the color portion of the color filter included in the liquid crystal panel is exemplified as three colors of R, G, and B. However, the color portion may be four or more colors.

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

(22) In each of the embodiments described above, a TFT is used as a switching element of a liquid crystal display device. 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.

(23) In each of the above-described embodiments, the liquid crystal display device using the liquid crystal panel as the display panel has been exemplified. However, the present invention can be applied to a display device using another type of display panel.

(24) In each of the above-described embodiments, the television receiver provided with the tuner is exemplified, but the present invention is also applicable to a display device not provided with the tuner.

DESCRIPTION OF SYMBOLS 10 ... Liquid crystal display device (display device), 11 ... Liquid crystal panel (display panel), 12 ... Backlight device (illumination device), 15 ... Light transmissive member, 17 ... LED ( Light source), 19 ... light guide plate, 19a ... light emitting surface, 19b ... light incident surface, 22 ... light shielding portion, 23 ... low light reflectance portion, 24 ... high light reflectance , 25 ... opening, 28 ... first light shielding part (light shielding part), 29 ... second light shielding part (light shielding part), LA ... light source arrangement region (light source arrangement pattern), LN ... Light source non-arrangement area (light source non-arrangement pattern), TV ... TV receiver

Claims

A plurality of light sources arranged intermittently side by side;
A light guide plate disposed opposite to the light source and having a light incident surface on which light from the light source is incident, and a light emitting surface for emitting the incident light;
A light-transmitting member that is disposed so as to cover at least a part of the light output surface of the light guide plate and transmits light from the light output surface;
A light-shielding portion provided on the light-transmitting member, disposed at least on the light source side with respect to the light incident surface, and disposed at least following the arrangement pattern of the light source, and blocking light from the light source. Lighting device.
A plurality of the light transmissive members are arranged in a stacked manner,
The lighting device according to claim 1, wherein the light shielding portion is provided on the light transmissive member closest to the light guide plate among the plurality of light transmissive members.
The lighting device according to claim 2, wherein the light shielding portion is arranged on a surface on the light guide plate side among a surface on the other side of the light transmissive member and a surface on the light guide plate side of the light transmissive member. .
In addition to being disposed on the light source side with respect to the light incident surface, the light shielding portion is disposed on the side opposite to the light source side with respect to the light incident surface and the light source plate has an end on the light source side. The lighting device according to any one of claims 1 to 3, wherein the illumination device overlaps with the portion in a plan view.
The lighting device according to any one of claims 1 to 4, wherein the light shielding portion is arranged following a non-arrangement pattern of the light sources in addition to the arrangement pattern of the light sources.
The lighting device according to claim 5, wherein the light shielding portion has a constant width and extends along the direction in which the light sources are arranged.
The light-shielding part has light reflectivity for reflecting light, and follows the arrangement pattern of the light source, follows a low-light reflectance part having a relatively low light reflectance, and follows a non-arrangement pattern of the light source. The lighting device according to claim 5 or 6, comprising a high light reflectance portion having a relatively high light reflectance.
The illuminating device according to claim 7, wherein the low light reflectivity portion has a light reflectivity that increases in a direction away from a center position of the light sources in the arrangement direction of the light sources.
The lighting device according to any one of claims 1 to 4, wherein the light shielding portion is formed with an opening that follows a non-arrangement pattern of the light source.
The lighting device according to any one of claims 1 to 9, wherein the light shielding portion is a separate component from the light transmissive member and is attached to the light transmissive member.
The lighting device according to claim 10, wherein the light shielding portion is made of a reflective member that reflects light.
The light transmissive member is configured such that an end on the light source side protrudes toward the light source from the light incident surface,
The lighting device according to any one of claims 1 to 9, wherein the light shielding portion is integrally formed at an end portion on the light source side of the light transmissive member.
The lighting device according to claim 12, wherein the light shielding portion is formed by printing a light shielding material on a surface of the light transmissive member.
A display device comprising: the illumination device according to any one of claims 1 to 13; and a display panel that performs display using light from the illumination device.
A television receiver comprising the display device according to claim 14.