Illuminating device

Abstract

To restrain luminance unevenness.SOLUTION: An illuminating device 30 comprises: a plurality of light sources 52 arranged side by side in a surface; a board 51 on which the plurality of light sources 52 are mounted; and a reflection member 60 arranged on a mounting surface 51A of the board 51, and having a rectangular shape in a planar view. The reflection member 60 comprises a plurality of insertion holes 61 into which at least one of the light sources 52 is inserted, and a plurality of wall parts 65 erected so as to surround the insertion holes 61. The inside of a surface of the reflection member 60 is partitioned into a plurality of reflection regions RA in a grid pattern by the wall parts 65. The wall parts 65 comprise main passage parts 66 through which light from the light sources 52 adjacent via the wall parts 65 can be passed, in first reflection regions RA1 located in corner parts of the reflection member 60 having the rectangular shape out of the reflection regions RA.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a lighting device. [Background technology]

[0002] Conventionally, liquid crystal display devices using so-called direct backlight devices in which light sources are arranged over the entire back side of a liquid crystal panel are known, and an example of such a device is disclosed in Patent Document 1. The liquid crystal display device described in Patent Document 1 includes a reflecting member having insertion holes through which a plurality of LEDs are individually inserted and sidewalls surrounding each of the LEDs inserted into the insertion holes. The reflecting member has a shape in which the sidewalls surround the LEDs in a lattice pattern in a plan view. With such a reflecting member, the light from the LEDs is more likely to be uniformly directed toward the liquid crystal panel by the sidewalls of the reflecting member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2012 / 029600 Summary of the Invention [Problem to be solved by the invention]

[0004] According to the above-mentioned reflecting member, the light from the LED is directed toward the liquid crystal panel, while also propagating within the plane to a certain extent. The outer peripheral edge (frame portion) of the plane of the backlight device has fewer LEDs around it than the center, and the amount of light propagated from the LEDs around it is small. For this reason, the outer peripheral edge of the plane of the backlight device is prone to lower brightness, and when the backlight device is rectangular in plan view, the corners tend to be the darkest.

[0005] The technology described in this specification was developed based on the above circumstances, and aims to suppress luminance unevenness. [Means for solving the problem]

[0006] (1) An illumination device according to the present technology includes a plurality of light sources arranged in a line on a plane, a substrate on which the plurality of light sources are mounted, and a reflective member arranged on a mounting surface of the substrate and having a rectangular shape in a planar view, the reflective member having a plurality of insertion holes through which at least one of the light sources is inserted and a plurality of wall portions standing to surround at least one of the insertion holes, the surface of the reflective member being partitioned in a lattice pattern by the plurality of wall portions into a plurality of reflective regions, and the wall portions of the reflective member have a main passage portion through which light from adjacent light sources can pass via the wall portions in a first reflective region located at a corner of the rectangular reflective member among the plurality of reflective regions.

[0007] (2) In addition to the above (1), the lighting device may further include a first main passage portion through which light from diagonally adjacent light sources can pass via the wall portion, the plurality of light sources being arranged in a row and a column direction.

[0008] (3) In addition to the above-mentioned (2), the main passage portion of the above lighting device may further include at least one of a second main passage portion through which light from the light sources adjacent in the row direction can pass via the wall portion, or a third main passage portion through which light from the light sources adjacent in the column direction can pass via the wall portion.

[0009] (4) In addition to the above (3), the lighting device may be configured so that an amount of light that can pass through the second main passage section and an amount of light that can pass through the third main passage section are each smaller than an amount of light that can pass through the first main passage section.

[0010] (5) In addition to any one of (1) to (4) above, the lighting device may be such that the main passage portion is a groove provided on a surface of the wall portion of the reflecting member opposite to the substrate.

[0011] (6) In addition to any one of (1) to (4) above, the lighting device may be such that the main passage portion is a groove provided on a surface of the wall portion of the reflecting member facing the substrate.

[0012] (7) In addition to any one of (1) to (4) above, the lighting device may be such that the main passage portion is a through hole in the wall portion of the reflecting member.

[0013] (8) In addition to any one of (2) to (7) above, the lighting device may be configured such that, among the plurality of light sources, an emission intensity of a first light source surrounded by the wall portion in the first reflective area is greater than an emission intensity of the light sources other than the first light source.

[0014] (9) In addition to the above-mentioned (8), in the above lighting device, among the plurality of light sources, in a second reflective area diagonally adjacent to the plurality of first reflective areas, the emission intensity of a second light source surrounded by the wall portion may be greater than the emission intensity of the light sources other than the first light sources and the second light source.

[0015] (10) In addition to the above (9), in the lighting device, among the plurality of light sources, an emission intensity of a third light source surrounded by the wall in a third reflection region adjacent to the first reflection region in the row direction, and an emission intensity of a fourth light source surrounded by the wall in a fourth reflection region adjacent to the first reflection region in the column direction may be greater than an emission intensity of the light sources other than the first light source, the second light source, the third light source, and the fourth light source, respectively.

[0016] (11) In addition to any one of (8) to (10) above, the lighting device may further include a mounting surface of the board that is divided into a plurality of dimming regions, each of which has a size that includes at least one of the light sources, the plurality of light sources that are configured to be able to adjust the light emission intensity for each of the dimming regions, and the light emission intensity that is adjusted by the amount of current flowing through the light source.

[0017] (12) In addition to any one of (8) to (10) above, the lighting device may further include a mounting surface of the board divided into a plurality of dimming regions each having a size including at least one of the light sources, the light sources being configured to be able to adjust the light emission intensity for each of the dimming regions and being driven by PWM dimming, and the light emission intensity may be adjusted by a duty ratio of a PWM signal for driving the light sources by the PWM dimming.

[0018] (13) In addition to any one of (8) to (10) above, the lighting device may further include a mounting surface of the board that is divided into a plurality of dimming regions, each of which has a size that includes at least one of the light sources, the plurality of light sources that are configured to be able to adjust the light emission intensity for each of the dimming regions, and the light emission intensity may be adjusted by using light sources with different specifications.

[0019] (14) In addition to any one of (2) to (13), the lighting device may further include a first sub-pass portion in the row direction and a second sub-pass portion in the column direction, the first sub-pass portion being a first side portion along the row direction of the rectangular reflective member, and the second sub-pass portion being a second side portion along the column direction of the rectangular reflective member. In the row reflective region, the first sub-pass portion allows light from the light sources adjacent in the column direction to pass through via the wall, and the second sub-pass portion in the column reflective region allows light from the light sources adjacent in the row direction to pass through via the wall.

[0020] (15) In addition to the above (14), the lighting device may further include a configuration in which the amount of light that can pass through the first sub-passage section and the amount of light that can pass through the second sub-passage section are each smaller than the amount of light that can pass through the first main passage section. Effect of the Invention

[0021] According to the present technology, it is possible to suppress uneven luminance. [Brief description of the drawings]

[0022] [Figure 1] FIG. 1 is an exploded perspective view of a liquid crystal display device according to a first embodiment. [Diagram 2] Partially enlarged cross-section taken along line II in Figure 1. [Diagram 3] Top view showing the LED and LED board [Figure 4] Enlarged view of the lower right part of Figure 3 [Diagram 5] Top view showing the LED, LED board, and reflective member [Figure 6] Enlarged view of the lower right part of Figure 5 [Figure 7] FIG. 1 is a perspective view showing an LED, an LED substrate, and a reflecting member. [Figure 8] FIG. 8 is an enlarged perspective view of the vicinity of a corner of the reflecting member in FIG. [Figure 9] FIG. 13 is a perspective view of the vicinity of a corner of a reflective member according to another embodiment, viewed from the back side (the LED substrate side). [Figure 10] FIG. 13 is a perspective view of the vicinity of a corner of a reflective member according to another embodiment, as viewed from the front side (display panel side). [Figure 11] FIG. 13 is a top view showing an LED, an LED substrate, and a reflecting member according to another embodiment. [Figure 12] Enlarged view of the lower right part of Figure 11 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] <Embodiment 1> A first embodiment will be described with reference to Fig. 1 to Fig. 8. In this embodiment, a liquid crystal display device (an example of a display device) 10 equipped with a backlight device 30 (an example of an illumination device) is illustrated. Each drawing shows an X-axis, a Y-axis, and a Z-axis, and each axis direction is drawn to be a common direction in each drawing. In addition, in the Z-axis direction, the liquid crystal panel 20 side is the front side, and the backlight device 30 side is the back side.

[0024] 1, the liquid crystal display device 10 includes a liquid crystal panel (one example of a display panel) 20 that displays an image, a backlight device (one example of an illumination device) 30 that irradiates light onto the liquid crystal panel 20, and a bezel 14. The liquid crystal panel 20 is sandwiched between the bezel 14 and a frame 45 (described later) of the backlight device 30, with a display surface 20A capable of displaying an image facing the front side. The liquid crystal panel 20, the backlight device 30, and the liquid crystal display device 10 in this embodiment are generally rectangular in shape, with the long side direction coinciding with the X-axis direction in each drawing, the short side direction coinciding with the Y-axis direction, and the thickness direction coinciding with the Z-axis direction. However, the illustrated shape is merely an example, and may be a vertically long rectangle, etc.

[0025] 1, bezel 14 is a support member disposed on the front side of liquid crystal panel 20. Bezel 14 extends along the outer periphery of the front side of liquid crystal panel 20, and constitutes the appearance of the front side of liquid crystal display device 10. Bezel 14 is made of, for example, a metal with excellent rigidity (stainless steel, aluminum, etc.).

[0026] 1, the backlight device 30 includes a plurality of LEDs 52 (an example of a light source), an LED board 51 (an example of a board) on which the LEDs 52 are mounted, a plurality of types of optical sheets 33, a reflective member 60, a chassis 40, and a frame 45. The LEDs 52 are arranged in a planar shape on the back side (lower side) of the liquid crystal panel 20, and the backlight device 30 is a so-called direct type backlight device.

[0027] The chassis 40 is in the shape of a shallow rectangular tray that opens toward the light emitting side (front side, liquid crystal panel 20 side), and an LED board 51 (see FIG. 3) is installed at the bottom. The chassis 40 is made of, for example, metal (stainless steel, aluminum, etc.). The frame 45 is frame-shaped and made of, for example, resin such as white or black polycarbonate.

[0028] The bezel 14, the frame 45, and the chassis 40 integrally hold the liquid crystal panel 20 and the backlight device 30. The bezel 14 and the frame 45 may have tape-like members attached thereto for fixing and blocking light. The bezel 14 and the frame 45 may be non-frame-shaped, and only one of them may be provided.

[0029] 1 and 3, the LEDs 52 are arranged in a lattice (matrix) on the main surface (mounting surface 51A) of the rectangular LED substrate 51 at equal intervals in the X-axis direction (row direction) and the Y-axis direction (column direction). The LEDs 52 are rectangular parallelepipeds, with their bottom surfaces arranged on the mounting surface 51A and their upper surfaces opposite the bottom surfaces serving as the light-emitting surfaces 52A, making them so-called top-emitting types (top-view types). The optical axis of the LEDs 52 (the traveling direction of the light with the highest (peak) luminous intensity of the emitted light) is the Z-axis direction.

[0030] The LED 52 is preferably a white light emitting type, and may be a compact package such as a CSP (Chip Scale Package) or a flip chip type. The LED 52 has a light emitting surface 52A with an area of ​​1.0 mm 2 The LED 52 may be a so-called mini LED or micro LED, which is as small as about 100 nm or less. When a monochromatic light-emitting type (e.g., a blue-emitting type) is used as the LED 52, a wavelength conversion sheet (color conversion sheet) is used in combination to emit white synthetic light (mixed light). The type of wavelength conversion sheet is not limited as long as it can convert the wavelength of the primary light into secondary light included in a different wavelength region, and for example, one containing a quantum dot phosphor, an inorganic phosphor, or an organic phosphor can be used.

[0031] The LED substrate 51 has a horizontally long rectangular shape and is configured such that a wiring pattern made of a conductive material is formed on a base material. For example, an aluminum substrate or a glass epoxy substrate is used as the LED substrate 51, but a flexible substrate (FPC) having excellent flexibility may also be used.

[0032] 3 and 4, the mounting surface 51A of the LED substrate 51 is divided into a plurality of dimming areas (segment areas) DA arranged in a matrix with no gaps. In this embodiment, each dimming area DA is rectangular and includes one LED 52 in its center. The dimming area DA only needs to be large enough to include at least one LED 52, and the pitch of the dimming areas DA and the number of LEDs 52 included in each dimming area DA can be appropriately changed depending on the screen size, application, and required accuracy of the liquid crystal panel 20.

[0033] Driving power is supplied to the LEDs 52 from an external power source via a wiring pattern formed on the LED substrate 51. The backlight device 30 has a wiring pattern etc. configured so that local dimming drive is performed in which the driving power supplied to the LEDs 52 is controlled independently for each dimming area DA. The driving power is controlled by a control unit provided in the liquid crystal display device 10. This makes it possible to locally adjust the amount of light emitted by the LEDs 52 for each dimming area DA. The backlight device 30 and the liquid crystal display device 10 are capable of high-definition, high-contrast brightness adjustment and low power consumption through local dimming drive.

[0034] 1, the optical sheet 33 has a horizontally long rectangular shape, and is disposed between the reflective member 60 and the liquid crystal panel 20 to impart a predetermined optical effect to the light from the LEDs 52. A wide variety of optical sheets 33 are known, and one or more types are appropriately used depending on the application of the liquid crystal display device 10, etc.

[0035] For example, when a light diffusion sheet is used for the optical sheet 33, it is possible to impart a diffusing effect to the light and improve the in-plane uniformity. The thickness of the light diffusion sheet is set to, for example, a range of about 30 μm to about 3 mm. Furthermore, when a brightness enhancement sheet is used for the optical sheet 33, it is possible to impart a condensing effect to the emitted light and improve the front brightness. For example, the brightness enhancement sheet may be BEF (Brightness Enhancement Film) (registered trademark) or DBEF (Dual Brightness Enhancement Film) (registered trademark) from 3M. Other specific examples of the optical sheet 33 include a dichroic sheet (dichroic filter), a turning lens, and a prism sheet (an optical sheet having a prism or lens shape, excluding a brightness enhancement sheet or a turning lens).

[0036] 5 to 8, the reflective member 60 is disposed on the mounting surface 51A of the LED substrate 51, and covers the entire mounting surface 51A from the front side. The reflective member 60 has a horizontally elongated rectangular shape in a plan view, and has four corners 60A, 60B, 60C, and 60D and four sides 60E, 60F, 60G, and 60H. The reflective member 60 is made of a resin such as white polycarbonate that has excellent light reflectance, and each part is integrally formed.

[0037] The reflecting member 60 also has a plurality of insertion holes 61 and a plurality of wall portions 65. The insertion hole 61 has a shape and size that allows at least one LED 52 to be inserted therethrough. Each insertion hole 61 according to the present embodiment has a rectangular shape and is large enough to insert one LED 52 therethrough. In the illustration, the LED 52 and the mounting surface 51A of the LED board 51 in the vicinity thereof are exposed to the front side from the insertion hole 61, but the insertion hole 61 may be formed to a size that allows only the light emitting surface 52A of the LED 52 to be inserted therethrough.

[0038] When a part of the mounting surface 51A of the LED substrate 51 is exposed from the insertion hole 61, a reflective sheet that covers the exposed part from the front side may be provided between the mounting surface 51A and the reflective member 60. By providing the reflective sheet, the reflectance can be further improved. For example, a polyester-based or PET-based white resin sheet such as ESR (Enhanced Specular Reflector) can be used as the reflective sheet.

[0039] The wall portion 65 of the reflecting member 60 is formed to stand upright and surround at least one insertion hole 61. The wall portion 65 according to the present embodiment surrounds each insertion hole 61 and each LED 52 inserted therein, but the wall portion 65 may surround a plurality of insertion holes 61 or may have a plurality of LEDs 52 inserted into each insertion hole 61, thereby surrounding a plurality of LEDs 52.

[0040] The surface of the reflecting member 60 is divided into a plurality of reflecting areas RA in a lattice pattern by the wall portion 65. The reflecting areas RA are preferably provided so as to separate the dimming areas DA of the local dimming drive described above. The reflecting area RA according to this embodiment is provided so as to separate one dimming area DA, and the reflecting area RA and the dimming area DA are substantially the same in size.

[0041] In the following, as shown in Fig. 6 and Fig. 8, the reflection area RA located at the corners 60A, 60B, 60C, and 60D of the reflection member 60 among the reflection areas RA is referred to as the first reflection area RA1. The reflection area diagonally adjacent to the first reflection area RA1 is referred to as the second reflection area RA2, the reflection area adjacent in the X-axis direction (row direction) is referred to as the third reflection area RA3, and the reflection area adjacent in the Y-axis direction (column direction) is referred to as the fourth reflection area RA4. The LEDs 52 in the first reflection area RA1 (i.e., the LEDs 52 surrounded by the wall portion 65 in the first reflection area RA1) are referred to as the first LEDs 52, the second LEDs 52 in the second reflection area RA2, the LEDs 52 in the third reflection area RA3 are referred to as the third LEDs 52, and the LEDs 52 in the fourth reflection area RA4 are referred to as the fourth LEDs 52.

[0042] The wall portion 65 includes an inclined surface 65A that protrudes from the LED substrate 51 side toward the front side while inclining. The four trapezoidal inclined surfaces 65A surround each LED 52 in an inverted quadrangular pyramid shape. The inclined surface 65A reflects the light emitted from each LED 52 and reaching the inclined surface 65A so as to be directed toward the front side. The degree of directing the light toward the front side can be adjusted by adjusting the angle of the inclined surface 65A. The inclination angle θ (FIG. 2) with the mounting surface 51A of the LED substrate 51 is preferably larger than 90° and as large as possible so that the space surrounded by the wall portion 65 widens toward the front side.

[0043] 2, the front end 65B of the wall portion 65 may be disposed with a small gap G1 between it and the rear surface 33A of the optical sheet 33, or may be in contact with the rear surface 33A of the optical sheet 33 without any gap. Providing the gap G1 facilitates the exchange of light emitted from the LEDs 52 surrounded by the wall portion 65 and light emitted from the LEDs 52 adjacent to the LEDs 52, i.e., light between adjacent reflective regions RA. However, even if there is no gap G1, the light between adjacent reflective regions RA exchanges to a certain extent before passing through the optical sheet 33 and being emitted to the liquid crystal panel 20, and spreads within the plane.

[0044] 6 and 8, the wall portion 65 has a main passage portion 66 in the first reflection area RA1 through which light from adjacent LEDs 52 can pass via the wall portion 65. The main passage portion 66 according to the present embodiment is a groove provided on the front surface (the surface opposite to the LED substrate 51) of the wall portion 65. The groove has a semicircular cross section in the drawings, but the shape is not limited thereto.

[0045] The main passage portion 66 includes a first main passage portion 66A through which light from LEDs 52 adjacent in the diagonal direction can pass via the wall portion 65, a second main passage portion 66B through which light from LEDs 52 adjacent in the X-axis direction (row direction) can pass, and a third main passage portion 66C through which light from LEDs 52 adjacent in the Y-axis direction (column direction) can pass. The main passage portion 66 preferably has at least the first main passage portion 66A.

[0046] The first main passage portion 66A can increase the amount of light propagating between the first reflection area RA1 and the second reflection area RA2. The second main passage portion 66B can increase the amount of light propagating between the first reflection area RA1 and the third reflection area RA3, and the third main passage portion 66C can increase the amount of light propagating between the first reflection area RA1 and the fourth reflection area RA4. This can increase the amount of light propagated from the LEDs 52 in the peripheral area in the first reflection area RA1, where the brightness is the lowest, and can increase the brightness. As a result, the brightness of the corners 60A, 60B, 60C, and 60D of the reflection member 60, and therefore the corners of the backlight device 30, can be increased, and brightness unevenness can be suppressed.

[0047] Incidentally, the third reflection area RA3 and the fourth reflection area RA4 have fewer LEDs 52 in the vicinity than the second reflection area RA2. More specifically, the third LED 52 in the third reflection area RA3 and the fourth LED 52 in the fourth reflection area RA4 are adjacent to five LEDs 52, respectively, while the second LED 52 in the second reflection area RA2 is adjacent to eight LEDs 52. For this reason, if the amount of light propagating to the first reflection area RA1 becomes excessively large, the third reflection area RA3 and the fourth reflection area RA4 may become too dark, which may cause another brightness unevenness. Therefore, it is preferable that the amount of light that can pass through the second main passage portion 66B and the amount of light that can pass through the third main passage portion 66C are each smaller than the amount of light that can pass through the first main passage portion 66A. Specifically, it is preferable that the size of the groove that is the second main passage portion 66B and the third main passage portion 66C is each smaller than the first main passage portion 66A, as shown in FIG. 6 and FIG. 8.

[0048] This makes it possible to appropriately narrow the amount of light propagating between the first reflection area RA1 and the third reflection area RA3, and between the first reflection area RA1 and the fourth reflection area RA4. In other words, the amount of light propagating can be appropriately adjusted so as not to become excessively large while propagating light from adjacent LEDs 52 in the row direction through the second main passing portion 66B, and light from adjacent LEDs 52 in the column direction through the third main passing portion 66C.

[0049] Moreover, it is preferable that the light emission intensity of the first LED 52, the second LED 52, the third LED 52, and the fourth LED 52 in each of the reflection regions RA1, RA2, RA3, and RA4 is greater than the light emission intensity of the other LEDs 52. Specifically, the light emission intensity may be adjusted by the amount of current flowing through each LED 52 at each gradation during local dimming driving. Furthermore, when the LED 52 is driven by PWM (Pulse Width Modulation) dimming, the light emission intensity may be adjusted by the duty ratio of the PWM signal during local dimming driving. Furthermore, the light emission intensity may be adjusted by using LEDs 52 with different specifications. This can further increase the brightness of the corners of the backlight device 30, making it easier to suppress uneven brightness.

[0050] <Embodiment 2> A reflective member 160 according to the second embodiment will be described with reference to Fig. 9. In the second embodiment, the same configurations, actions, and effects as those in the first embodiment will not be described repeatedly.

[0051] The main passing portion 166 of the reflecting member 160 is a groove provided on the back surface (the surface on the LED substrate 51 side) 65C of the wall portion 65. The groove in the drawing has a semicircular cross section, but the shape is not limited thereto. The sizes of the grooves that are the second main passing portion 166B and the third main passing portion 166C are preferably smaller than the first main passing portion 166A.

[0052] <Embodiment 3> A reflective member 260 according to the third embodiment will be described with reference to Fig. 10. In the third embodiment, the same configurations, actions, and effects as those in the first and second embodiments will not be described repeatedly.

[0053] The main passing portion 266 of the reflecting member 260 is a through hole passing through the wall portion 65. The shape of the through hole in the figure is circular, but the shape is not limited to this. It is preferable that the size of the through hole that is the second main passing portion 266B and the third main passing portion 266C is smaller than that of the first main passing portion 266A.

[0054] <Embodiment 4> A reflective member 360 according to the fourth embodiment will be described with reference to Figures 11 and 12. In the fourth embodiment, the same configurations, actions, and effects as those of the first to third embodiments will not be described repeatedly.

[0055] Of the reflective area RA, the portion located on the first sides 60E, 60G along the row direction of the reflective member 360 other than the first reflective area RA1 is designated as a row reflective area RA5, and the portion located on the second sides 60F, 60H along the column direction other than the first reflective area RA1 is designated as a column reflective area RA6.

[0056] The multiple walls 65 of the reflecting member 360 further have multiple first sub-passing portions 68A and multiple second sub-passing portions 68B in addition to the first main passing portion 66A described above. The first sub-passing portion 68A is a portion in the row reflecting region RA5 through which light from LEDs 52 adjacent in the column direction via the wall portion 65 can pass. The second sub-passing portion 68B is a portion in the column reflecting region RA6 through which light from LEDs 52 adjacent in the row direction via the wall portion 65 can pass.

[0057] The first sub-passage portion 68A and the second sub-passage portion 68B are shown as grooves similar to the main passage portion 66 of embodiment 1, but they may be grooves similar to the main passage portion 166 of embodiment 2 or through holes similar to the main passage portion 266 of embodiment 3.

[0058] In this way, the amount of light propagated from the LEDs 52 in the peripheral region can be increased, and the brightness can be increased even in the row reflective region RA5 and the column reflective region RA6, where the brightness is likely to decrease. As a result, the brightness can be increased in the sides 60E, 60F, 60G, and 60H of the reflective member 60, and further in the sides of the backlight device 30, and brightness unevenness occurring not only in the corners but also in the sides can be suppressed.

[0059] In addition, it is preferable that the amount of light that can pass through the first sub-passing portion 68A and the amount of light that can pass through the second sub-passing portion 68B are smaller than the amount of light that can pass through the first main passing portion 66A. This makes it possible to appropriately narrow the amount of light propagating through the first sub-passing portion 68A and the second sub-passing portion 68B. As a result, while propagating light through the first sub-passing portion 68A and the second sub-passing portion 68B, it is possible to appropriately adjust the amount of propagation so that it does not become excessively large.

[0060] <Other embodiments> The present invention is not limited to the embodiments described above and illustrated in the drawings, and the following embodiments, for example, are also included within the technical scope of the present invention.

[0061] (1) The reflecting members 60, 160, 260, and 360 do not have to be integrally formed as a single member, and may be formed by assembling a plurality of separate members.

[0062] (2) The configurations according to the first to fourth embodiments may be implemented in combination. That is, the shapes of the first main passage portion 66A, 166A, 266A, the second main passage portion 66B, 166B, 266B, the third main passage portion 66C, 166C, 266C, the first sub passage portion 68A, and the second sub passage portion 68B may not all be the same. For example, the first main passage portion 66A may be realized by the groove described in the first embodiment, and the second main passage portion 266B and the third main passage portion 266C may be realized by the through-hole described in the third embodiment. [Explanation of symbols]

[0063] 10... liquid crystal display device (display device), 20... liquid crystal panel (display panel), 30... backlight device (illumination device), 51... LED board (board), 51A... mounting surface, 52... LED (light source), 60, 160, 260, 360... reflective member, 60A, 60B, 60C, 60D... corner portion, 60E, 60G... first side portion, 60F, 60H... second side portion, 61... insertion hole, 65... wall portion, 66, 166, 266... Main passage section, 66A, 166A, 266A...First main passage section, 66B, 166B, 266B...Second main passage section, 66C, 166C, 266C...Third main passage section, 68A...First sub passage section, 68B...Second sub Passing section, DA...dimming area, RA...reflection area, RA1...first reflection area, RA2...second reflection area, RA3...third reflection area, RA4...fourth reflection area, RA5...row reflection area, RA6...column reflection area

Claims

1. A plurality of light sources arranged in a plane; a substrate on which the plurality of light sources are mounted; A reflecting member that is disposed on the mounting surface of the substrate and has a rectangular shape in a plan view, The reflecting member is a plurality of insertion holes through which at least one of the light sources is inserted; a plurality of wall portions standing to surround at least one of the insertion holes; The surface of the reflecting member is partitioned into a plurality of reflecting regions in a lattice pattern by the plurality of wall portions, The wall portion of the reflective member has a main passage portion through which light from adjacent light sources can pass via the wall portion in a first reflective area that is located at a corner of the rectangular reflective member among the multiple reflective areas.

2. The plurality of light sources are arranged in a row direction and a column direction, The lighting device according to claim 1 , wherein the main passage portion includes a first main passage portion through which light from the light sources diagonally adjacent to each other can pass via the wall portion.

3. 3. The lighting device according to claim 2, wherein the main passage portion further includes at least one of a second main passage portion through which light from the light sources adjacent in the row direction can pass via the wall portion, or a third main passage portion through which light from the light sources adjacent in the column direction can pass via the wall portion.

4. The lighting device according to claim 3 , wherein an amount of light that can pass through the second main passage portion and an amount of light that can pass through the third main passage portion are each smaller than an amount of light that can pass through the first main passage portion.

5. The lighting device according to claim 1 , wherein the main passage portion is a groove provided on a surface of the wall portion of the reflecting member opposite to the substrate.

6. The lighting device according to claim 1 , wherein the main passage portion is a groove provided on a surface of the wall portion of the reflecting member facing the substrate.

7. The lighting device according to claim 1 , wherein the main passage portion is a through hole in the wall portion of the reflecting member.

8. The lighting device according to claim 2 , wherein an emission intensity of a first light source surrounded by the wall portion in the first reflection region among the plurality of light sources is greater than an emission intensity of the light sources other than the first light source.

9. 9. The lighting device according to claim 8, wherein, among the plurality of light sources, in a second reflection region that is diagonally adjacent to the plurality of first reflection regions, an emission intensity of a second light source surrounded by the wall portion is greater than an emission intensity of the light sources other than the first light source and the second light source.

10. 10. The lighting device according to claim 9, wherein an emission intensity of a third light source surrounded by the wall in a third reflection region adjacent to the first reflection region in the row direction, among the plurality of light sources, and an emission intensity of a fourth light source surrounded by the wall in a fourth reflection region adjacent to the first reflection region in the column direction are greater than an emission intensity of the light sources other than the first light source, the second light source, the third light source, and the fourth light source, respectively.

11. The mounting surface of the substrate is divided into a plurality of dimming regions each having a size including at least one of the light sources; The plurality of light sources are configured to be able to adjust the light emission intensity for each of the dimming regions, The lighting device according to claim 8 , wherein the emission intensity is adjusted by an amount of current flowing through the light source.

12. The mounting surface of the substrate is divided into a plurality of dimming regions each having a size including at least one of the light sources; The plurality of light sources are configured to be capable of adjusting the light emission intensity for each of the dimming regions and are driven by PWM dimming. The lighting device according to claim 8 , wherein the emission intensity is adjusted by a duty ratio of a PWM signal for driving the light source with the PWM dimming.

13. The mounting surface of the substrate is divided into a plurality of dimming regions each having a size including at least one of the light sources; The plurality of light sources are configured to be able to adjust the light emission intensity for each of the dimming regions, The lighting device according to claim 8 , wherein the emission intensity is adjusted by using the light sources having different specifications.

14. The plurality of light sources are arranged in a row direction and a column direction, Among the plurality of reflective regions, a portion located on a first side portion along the row direction of the rectangular reflective member other than the first reflective region is defined as a row reflective region, and a portion located on a second side portion along the column direction other than the first reflective region is defined as a column reflective region. The wall portion of the reflecting member is a first sub-passing portion through which light from the light sources adjacent in the column direction can pass via the wall portion in the row reflective region; The lighting device according to claim 2 , further comprising: a second sub-passing portion in the column reflective region through which light from the light sources adjacent in the row direction can pass via the wall portion.

15. The lighting device according to claim 14 , wherein an amount of light passing through the first sub passage portion and an amount of light passing through the second sub passage portion are each smaller than an amount of light passing through the first main passage portion.

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