WO2013099718A1

WO2013099718A1 - Lighting device, backlight, liquid crystal display device, and television receiver

Info

Publication number: WO2013099718A1
Application number: PCT/JP2012/082864
Authority: WO
Inventors: 香織生田
Original assignee: シャープ株式会社
Priority date: 2011-12-26
Filing date: 2012-12-19
Publication date: 2013-07-04
Also published as: CN103930711B; JPWO2013099718A1; CN103930711A

Abstract

This lighting device is provided with a housing which is provided with a first reflecting unit facing a light output surface, and substrates in which LEDs are arranged linearly in a first direction, which is a direction along the first reflecting unit, and in which that arrangement of LEDs is formed in a plurality of steps in a second direction crossing the first direction. In the arrangement of LEDs which is formed in a plurality of steps in the second direction, the number of LEDs on the middle step is greater than the number of LEDs on any other steps (upper step and lower step).

Description

Illumination device, backlight, liquid crystal display device, and television receiver

The present invention relates to an illumination device using a light emitting diode (LED) as a light source, a backlight using the illumination device, a liquid crystal display device including the backlight, and a television receiving device including the liquid crystal display device.

In recent years, LEDs have been increasingly used as light sources for lighting devices. LED has many advantages such as small size, long life, low power consumption due to high luminous efficiency, and no mercury, compared with fluorescent lamps (cold cathode tube etc.) that have been used conventionally. .

This lighting device is, for example, attached to the ceiling of a living room and used as room lighting, or disposed on the back of a liquid crystal display device and used as a backlight. At that time, since the LED is a point light source, a luminance distribution is formed in the light emitted from the light emitting surface, and uneven luminance tends to occur. In order to suppress this luminance unevenness, a lighting device in which a reflecting member is arranged on a surface facing the light emitting surface and LEDs are arranged so as to emit light in a direction along the light emitting surface and / or the surface of the reflecting member. Has been proposed. There has also been proposed an illumination device that further suppresses luminance unevenness by providing a collimator lens in the light irradiation direction of the LED (see Patent Document 1).

JP 2009-9890 A

However, in Patent Document 1, since the LEDs are evenly arranged in the vertical and horizontal directions, the light flux density increases in the vicinity of the LED due to the light emitted from the LED close to the light output surface and the LED close to the reflecting member, and the light output surface near the LED. There is a problem that the luminance of the image becomes higher and luminance unevenness occurs.

This luminance unevenness can be suppressed unless the LEDs are arranged in the horizontal direction and arranged in the vertical direction, but in this case, a small number of high-brightness LEDs are arranged because the arrangement space is reduced. However, high-brightness LEDs are expensive and cause an increase in cost.

An object of the present invention is to provide a lighting device in which light sources are arranged vertically and horizontally and luminance unevenness is suppressed. Another object of the present invention is to provide a backlight using the illumination device, a liquid crystal display device including the backlight, and a television receiver including the liquid crystal display device.

In order to achieve the above object, according to the present invention, a housing including a first reflecting portion facing a light emitting surface and a light emitting diode are linearly arranged in a first direction which is a direction along the first reflecting portion. And an array of light emitting diodes, the substrate having a plurality of stages formed in a second direction intersecting the first direction, wherein the plurality of stages are formed in the second direction. The number of light emitting diodes in the central stage is larger than the number of light emitting diodes in any other stage.

According to this configuration, the luminous flux density from the central stage of the substrate is high, and the luminous density of other stages is lower than that. Therefore, it is possible to suppress the light flux emitted from the vicinity of the substrate from becoming too high.

In the above-described lighting device, the casing has a disk portion, and the plurality of substrates are respectively disposed near the center of the casing so as to emit light toward the outer periphery of the casing. Also good. Furthermore, the housing may include an outer wall portion protruding from the outer periphery of the disk portion, and a second reflecting portion may be provided along the inner side of the outer wall portion.

Further, in the above illumination device, the casing has a disc portion, the casing has an outer wall portion protruding from an outer periphery of the disc portion, and the substrate is disposed along the inner side of the outer wall portion. You may make it do.

In the illumination device, the housing may have a rectangular flat plate portion, and the substrate may be disposed on a wall body protruding from at least one side of the flat plate portion.

Further, the backlight of the present invention uses the above-described lighting device. The liquid crystal display device of the present invention is provided with the backlight. The television receiver of the present invention includes the liquid crystal display device.

According to the present invention, by devising the vertical and horizontal arrangements of the light emitting diodes in the lighting device, it is possible to suppress the light flux emitted from the vicinity of the substrate from becoming too high, and as a result, suppress the uneven luminance of the entire lighting device. can do.

It is a disassembled perspective view of the illuminating device of 1st Embodiment. It is the figure which looked at the light emission part of FIG. 1 from the side surface. It is the figure which looked at the light emission part of FIG. 2 from the downward direction. It is the front view which expanded the flat plate part which attached the light source part. FIG. 5 is a cross-sectional view taken along line VV in FIG. 4. It is a figure which shows the luminance distribution of the light radiate | emitted from the illuminating device of a comparative example. It is a figure which shows the luminance distribution of the light radiate | emitted from the illuminating device of 1st Embodiment. It is sectional drawing cut | disconnected by the WW line of FIG. It is a fragmentary sectional view of the illuminating device of 2nd Embodiment. It is a fragmentary sectional view of the illuminating device of 3rd Embodiment. It is a fragmentary sectional view of the illuminating device of 4th Embodiment. It is a perspective view of the chassis used for the illuminating device of 4th Embodiment. It is a disassembled perspective view of the liquid crystal display device of 5th Embodiment.

(First embodiment)
FIG. 1 is an exploded perspective view of a lighting device according to an embodiment of the present invention. A lighting device A shown in FIG. 1 is a ceiling light attached to a ceiling surface, and an upper portion in the drawing is attached to the ceiling surface. In the following description, when explaining the vertical direction, the vertical direction in the state of FIG. 1 will be described as a reference except when otherwise described, and the vertical direction in the state of FIG. (Vertical direction), the vertical direction or the thickness direction of the lighting device, the horizontal direction may be described as the H direction (horizontal direction).

As shown in FIG. 1, the lighting device A includes a chassis 1, a drive control unit 2, a light emitting unit 3, and a cover 4 in order from the top. The chassis 1 is a casing attached to the ceiling surface, and is a disk-shaped member made of aluminum. A power connector (not shown) that is provided on the ceiling surface and supplies power passes through the opening in the central portion of the chassis 1. On the surface opposite to the surface facing the ceiling surface of the chassis 1 (inner surface of the chassis 1), a reflecting surface (reflecting portion) that efficiently reflects the light emitted from the light emitting portion 3 is formed by surface treatment. . In addition, as this surface treatment, for example, a method of attaching a highly reflective sheet such as foamed PET (polyethylene terephthalate) or a method of applying a white paint can be used.

The drive control unit 2 is attached so as to surround the center of the chassis 1. The drive control unit 2 includes circuits such as a power supply circuit that supplies power to the light emitting unit 3 and a control circuit that performs lighting control. The drive control unit 2 includes an insulating sheet 20 for suppressing leakage to the chassis 1, a circuit board 21 on which a power supply circuit, a control circuit, and the like are mounted, and

support units

22 and 23 that support the circuit board 21. . The drive control unit 2 also includes a circuit that is electrically connected to a power connector (not shown) provided on the ceiling surface and converts the supplied power into power corresponding to the light emitting unit 3.

The light emitting unit 3 is fixed to the chassis 1 with screws, and the drive control unit 2 is fixed to the light emitting unit 3 with screws. In a state where the drive control unit 2 and the light emitting unit 3 are attached to the chassis 1, the cover 4 is attached so as to surround the side of the chassis 1 where the drive control unit 2 and the light emitting unit 3 are attached. The cover 4 is fixed by engaging the outer peripheral portion with the chassis 1 and screwing the central portion to the light emitting unit 3. The cover 4 is a light exit surface (light exit surface) from which light emitted from the light emitting unit 3 exits, and has high transmittance and light weight such as acrylic resin such as PMMA (polymethyl methacrylate), polystyrene, polycarbonate, and the like. It is preferable that the resin is made. Moreover, it is preferable that the surface of the cover 4 is processed so that emitted light is diffused.

The light emitting unit 3 includes an attachment angle 31, a substrate 32 that is fixed to the attachment angle 31 and on which an LED 33 (described later) as a light source is mounted, and a light collecting member 5 that is disposed so as to cover the substrate 32. Yes. In addition, it can be said that the light source part is comprised with the board | substrate 32 with which LED33 was mounted, and the condensing member 5. FIG.

FIG. 2 is a view of the light emitting unit 3 viewed from the side, and FIG. 3 is a view of the light emitting unit 3 viewed from below. The mounting angle 31 of the light emitting unit 3 is formed by cutting and bending a metal plate. As shown in FIGS. 1, 3, and the like, the mounting angle 31 includes a rectangular flat plate portion 311, a plate-like fixing portion 312 extending from one long side of the flat plate portion 311, and the other of the flat plate portion 311. A holding portion 313 extending from the long side of the flat plate portion 311 to the opposite side of the fixed portion 312.

The mounting angle 31 is formed in a regular octagonal cylindrical shape by connecting the short sides of the adjacent flat plate portions 311 together. Thus, when the flat plate portion 311 is connected in a regular octagonal cylindrical shape, the fixing portion 312 extends toward the outside of the regular octagon, and the holding portion 313 extends toward the inside of the regular octagon. In addition, the lighting device A shows a regular octagonal shape, but is not limited to this, and is a shape that can hold a flat plate-like substrate in a cylindrical shape, which is nearly circular (for example, a regular hexagon, It may be a regular dodecagon or the like.

As shown in FIG. 1, the mounting angle 31 is divided into two members so that four flat plate portions 311 are included. Then, the divided members are manufactured by pressing metal plates one by one, and then joined to form a regular octagonal cylindrical shape. In addition, in the illuminating device A of FIG. 1, although the angle 31 for attachment is divided | segmented into two members, it is not limited to it, You may divide | segment into three or more, but the divided member is The number of divisions having the same shape (for example, 2, 4, and 8 in the case of a regular octagon) is preferable. In addition, by making the divided | segmented member into the same shape, the shape of the metal plate of material and the metal mold | die for press work can be unified, and manufacturing cost can be reduced.

As shown in FIGS. 2 and 3, the substrate 32 is arranged so that the LED 33 is on the outer side of the regular octagonal cylindrical shape on the flat plate portion 311 of the mounting angle 31, and the longitudinal direction is the H direction. Attached to and fixed.

The light emitting unit 3 and its mounting part will be described in more detail. 4 is an enlarged front view of the flat plate portion 311 to which the light source portion is attached, and FIG. 5 is a cross-sectional view taken along the line VV of FIG. As shown in FIG. 4, in the flat plate portion 311 of the mounting angle 31, the light collecting member 5 is disposed on the most front side, and since the light collecting member 5 is transparent, it is disposed on the back surface of the light collecting member 5. The substrate 32 and the LED 33 are also shown by solid lines.

As shown in FIG. 5, the mounting angle 31 has an upper fixing portion 312 fixed to the chassis 1 with screws Bt, and a cover 4 attached to the holding portion 313 with screws Bt. The flat plate portion 311 is provided with a cut-and-raised portion 314 protruding inside the regular octagonal cylindrical shape, and the circuit board 21 is fixed to the cut-and-raised portion 314 with screws Bt.

In the illuminating device A provided with such an attachment angle 31, the circuit board 21 is disposed in the central portion, so that the central portion is a non-light emitting portion. In the illumination device A, it is preferable that the non-light emitting portion is small, and the smaller one side of the regular octagon of the mounting angle 31 is, the smaller the non-light emitting portion is.

As shown in FIG. 4, chip-shaped LEDs 33 are mounted on a rectangular substrate 32 attached to the flat plate portion 311. The LED 33 has a rectangular parallelepiped package having a square shape in plan view. On the substrate 32, the LEDs 33 are linearly arranged in the longitudinal direction (first direction), and the linear arrangement of the LEDs 33 is arranged in three stages in the short direction (second direction). Thus, by arranging the LEDs 33 in multiple stages, the length of the substrate 32 in the longitudinal direction can be shortened when the same number of LEDs 33 are arranged. Thereby, the length of one side of the regular octagon of the mounting angle 31 can be reduced, and the non-light-emitting portion of the illumination device A can be reduced. Note that the first direction and the second direction do not necessarily need to be orthogonal to each other, and may be crossed. Moreover, the 1st direction should just be a direction along a reflection part.

As shown in FIGS. 4 and 5, on the substrate 32, the LED 33 arranged in the horizontal direction (H direction) is arranged in three stages in the vertical direction (V direction). As shown in FIG. 4, the LEDs 33 at each stage are arranged in the H direction. The LEDs 33 in each stage are arranged at substantially equal intervals, and the number of LEDs 33 is larger in the central stage than in the upper and lower stages. For example, 1 mm square LEDs are arranged at 1 mm intervals in the horizontal direction at the center stage, and 2 mm intervals are arranged at the upper and lower stages, and each stage is arranged at 1 mm intervals above and below. It can be configured.

Usually, when the luminous efficiency is the same, the larger the light emitting surface area, the larger the amount of light emitted from the LED. That is, when the LEDs 33 are arranged as shown in FIG. 4, the light emitted from the central portion is brighter than the light emitted from the upper and lower stages.

When the light emitted from the light source unit having a plurality of stages of LEDs 33 arranged in the H direction in the V direction is collected by a conventional collimator lens, the light is emitted from the upper LED 33 and is directed upward. The irradiation range of the light in the V direction is wide from the light traveling to the light emitted from the lower LED 33 and traveling downward.

The LED 33 is a point light source, and the emitted light is divergent light (Lambertian light distribution). The light emitted from the LED 33 has a high luminous flux density in the vicinity of the mounting angle 31. Of the LEDs 33 arranged in three stages on the substrate 32, the luminous flux density of the light emitted from the LED 33 at the stage (upper stage) close to the chassis 1 and irradiated onto the chassis 1 is higher than the LEDs 33 at other stages. The light having a high luminous flux density is reflected by the chassis 1 and emitted from the cover 4. Further, the luminous flux density of the light emitted from the LED 33 at the stage (lower stage) close to the cover 4 and transmitted through the vicinity of the mounting angle 31 of the cover 4 is also increased.

From this, by reducing the number of LEDs 33 at the stage close to the chassis 1 and the cover 4 in the V direction from the center stage, in other words, by increasing the number of LEDs 33 at the center stage from the upper stage and the lower stage, Of the light emitted from the cover 4, the light flux of the light emitted from the vicinity of the mounting angle 31 can be suppressed from becoming too high. In this way, by changing the number of the LEDs 33 arranged depending on the step of the substrate 32 in the V direction, the variation (luminance unevenness) in the light flux density of the light emitted from the cover 4 can be suppressed.

By the way, in the illuminating device configured to emit light from the LED 33 along the cover 4 which is a light emitting surface, the light inclined at a predetermined angle (for example, 30 degrees with respect to the central axis) from the LED 33 is the chassis 1 and / or It is known that as the distance from the position reaching the cover 4 to the LED 33 increases, that is, as the parallel light is approached, the change in the light flux density due to the distance decreases. Therefore, in the illuminating device A, the condensing member 5 as shown in FIG. 5 is used, the light radiate | emitted from LED33 is condensed, and it is made to reach | attain far.

As shown in FIG. 5, the condensing member 5 is formed on the side opposite to the facing surface 50 facing the LED 33 mounted on the substrate 32, and condenses the light emitted from the LED 33 only in the V direction. 52 is formed. On the substrate 32, the LEDs 33 arranged in the H direction are arranged so as to be coaxial or substantially coaxial in the V direction. Therefore, the condensing part 52 is a collimator shape with respect to each arrangement | sequence of LED33 of each step | level of a V direction.

The condensing unit 52 has a lens shape (here, a collimator lens shape) that is curved in the V direction and extends in the H direction. The light collecting unit 52 is arranged in three stages in the V direction and corresponds to the arrangement of the LEDs 33 arranged in the H direction, and has a shape for collecting the light emitted from the LEDs 33 arranged in each stage in the V direction. It has become. In addition, the shape of the condensing part 52 is not limited to a collimator lens shape, What is necessary is just an optical element which can condense in the V direction of LED32, for example, a cylindrical lens may be used. Further, the condensing units 52 at each stage may have different shapes or the same shape.

4 and 5, the substrate 32 and the light collecting member 5 are fastened together and fixed to the flat plate portion 311 with screws Sc. A through hole is formed in the substrate 32 and is fixed through the through hole. A spacer 51 is formed on the surface of the light collecting member 5 facing the substrate 32, and the spacer 51 is in contact with the substrate 32, thereby preventing the light collecting member 5 from contacting the LED 33. In FIG. 5, the screw Sc passes through the spacer 51 of the light collecting member 5. However, the present invention is not limited to this, and the screw Sc may pass through a portion other than the spacer 51 of the light collecting member 5.

The effect of the present invention will be described with reference to the drawings. FIG. 6 is a diagram showing the luminance distribution of light emitted from the illumination device of the comparative example, and FIG. 7 is a diagram showing the luminance distribution of light emitted from the illumination device A of one embodiment of the present invention. 8 is a cross-sectional view taken along line WW in FIG.

As shown in FIG. 6, the illumination device of the comparative example has a high luminance near the light source unit and a low luminance at the outer peripheral portion of the illumination device. On the other hand, as shown in FIG. 7, in the illumination device A, the luminance does not decrease much even in a portion away from the light source unit. That is, it can be seen that the light emitted from the illumination device A is light with less luminance unevenness than the light emitted from the illumination device of the comparative example.

The light emitting unit 3 described above is an example of the present invention, and the present invention is not limited to this. Even in a structure in which the arrangement of the LEDs 33 arranged in the H direction is four or more in the V direction, a collection corresponding to each stage. It goes without saying that an equivalent effect can be obtained by using a light collecting member having an optical part. At this time, the central stage in the second direction indicates the central one stage when the total number of stages is an odd number, but indicates the central two stages when the total number of stages is an even number.

(Second Embodiment)
FIG. 9 is a partial cross-sectional view of the illumination device B of the second embodiment. Components that are substantially the same as those of the lighting device A of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The lighting device B is different from the lighting device A of the first embodiment in the form of the chassis 10.

The chassis 10 is a circular shape that gradually warps inward from the center toward the outer periphery, and has a so-called tray shape. Even in the lighting device B using the chassis 10 having such a shape, the same effect as that of the lighting device A of the first embodiment can be obtained.

(Third embodiment)
FIG. 10 is a partial cross-sectional view of the illumination device C according to the third embodiment. Components that are substantially the same as those of the lighting device A of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The lighting device C is different from the lighting device A of the first embodiment in the form of the chassis 11.

The chassis 11 has a disk part 111 having the same shape as the chassis 1 and an outer wall part 112 protruding from the outer periphery of the disk part 111 to the cover 4 side. The first reflecting portion is formed along the inner side of the disc portion 111 and the second reflecting portion is formed along the inner side of the outer wall portion 112 by surface treatment. Also in the illuminating device C using the chassis 11 of such a shape, the effect similar to the illuminating device A of 1st Embodiment can be acquired.

(Fourth embodiment)
FIG. 11 is a partial cross-sectional view of the illumination device D according to the fourth embodiment, and FIG. 12 is a perspective view of a chassis used in the illumination device D. Components that are substantially the same as those of the lighting device A of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The illumination device D is different from the illumination device A of the first embodiment in the form of the chassis 12 and the arrangement of the light source unit.

The chassis 12 includes a disk-shaped disk part 121 and a regular octagonal outer wall part 122 protruding from the vicinity of the outer periphery of the disk part 121 toward the cover 4. A light source section including the substrate 32 on which the LEDs 33 are mounted and the light collecting member 5 is disposed along the inner side of the outer wall section 122. Also in the illuminating device C using the chassis 11 of such a shape, the effect similar to the illuminating device A of 1st Embodiment can be acquired.

(Fifth embodiment)
Since the illuminating device of the present invention emits planar light from the light emitting surface, it can be used as a backlight of a liquid crystal display device.

Hereinafter, an example in which the lighting device of the present invention is used as a backlight of a liquid crystal display device will be described with reference to the drawings. FIG. 13 is an exploded perspective view of a liquid crystal display device according to an embodiment of the present invention.

As shown in FIG. 13, the liquid crystal display device 8 includes a liquid crystal panel unit 81 and a backlight unit 82. In the liquid crystal display device 8, a liquid crystal panel unit 81 is arranged on the front side (observer side) of the backlight unit 82, and the liquid crystal panel unit 81 is placed on a metal bezel 83 having an opening window 830 in the center on the front side. It is being pressed.

The liquid crystal panel unit 81 includes a liquid crystal panel 811 in which liquid crystal is sealed, and a polarizing plate 812 attached to the front surface (observer side) and the back surface (backlight unit 82 side) of the liquid crystal panel 811. The liquid crystal panel 811 includes an array substrate 813, a counter substrate 814 arranged to face the array substrate 813, and liquid crystal filled between the array substrate 813 and the counter substrate 814.

The array substrate 813 is provided with a source wiring and a gate wiring orthogonal to each other, a switching element (for example, a thin film transistor) connected to the source wiring and the gate wiring, a pixel electrode connected to the switching element, an alignment film, and the like. The counter substrate 814 is provided with a color filter in which colored portions of red, green, and blue (RGB) are arranged in a predetermined arrangement, a common electrode, an alignment film, and the like.

In the liquid crystal panel unit 81, a voltage is applied between the array substrate 813 and the counter substrate 814 in each pixel of the liquid crystal panel 811 by driving the switching element. When the voltage between the array substrate 813 and the counter substrate 814 changes, the liquid crystal in each pixel rotates and light is modulated (the degree of light transmission is changed). As a result, an image is displayed in the image display area on the viewer side of the liquid crystal panel 811.

The bezel 83 is a metal frame, and has a shape that covers the front edge portion of the liquid crystal panel unit 81. The bezel 83 includes a rectangular opening window 830 formed so as not to hide the image display area of the liquid crystal panel unit 81, a pressing portion 831 that presses the liquid crystal panel unit 81 from the front side, and a rear surface from the edge of the pressing portion 831. And a cover portion 832 that covers the edges of the liquid crystal panel unit 81 and the backlight unit 82. The bezel 83 is grounded and shields the liquid crystal panel unit 81 and the backlight unit 82.

The backlight unit 82 is an illumination device that irradiates the liquid crystal panel unit 81 with planar light. The backlight unit 82 has a structure equivalent to that of the lighting device shown in the first embodiment. That is, the backlight chassis 821 having a rectangular bottom corresponding to the chassis 1 and the light source unit 823 corresponding to the light emitting unit 3 are provided. Since the backlight unit 82 is a member having a rectangular bottom surface, the light source unit 823 is disposed on both short sides. And although illustration is abbreviate | omitted, the control circuit part is attached to the surface of the back side of a bottom face. An optical sheet member 822 for diffusing outgoing light and increasing luminance is disposed on the light outgoing surface side of the backlight unit 82.

The structure of the light source unit 823 has substantially the same structure as that of the light emitting unit 3 except that the substrate is arranged in a straight line. That is, a plurality of substrates 32 and light collecting members 5 on which the LEDs 33 shown in FIG. 4 are mounted are attached to the short sides. In the backlight unit 82, since the light source unit 823 is attached to the outer peripheral portion of the backlight chassis 821, a side wall (wall body) is formed by raising the backlight chassis 821 from each side of the rectangular bottom surface. Therefore, it can be used as a mounting angle.

Such a backlight unit 82 can emit planar light with less luminance unevenness than the light emitting surface facing the bottom without using a light guide plate, and the number of components can be reduced accordingly. is there.

The liquid crystal display device shown in the present embodiment can be used in, for example, a mobile phone, a tablet PC, a display device for home appliances, a television receiver, and the like.

In each of the above-described embodiments, a ceiling lamp or a backlight of a liquid crystal display device is cited as the lighting device, but in addition to these, it can also be used as a back-type lighting device that illuminates from the back of an electric signboard or the like. Is possible.

As mentioned above, although embodiment of this invention was described, this invention is not limited to this content. The embodiments of the present invention can be variously modified without departing from the spirit of the invention.

The illuminating device of the present invention emits light with less unevenness in luminance, so it is attached to the ceiling of a living room or the like, and can be used as a backlight for illuminating equipment or a liquid crystal display device that irradiates the entire light.

1 Chassis (housing)
32 Substrate 33 LED
111, 121

disc part

112, 122 outer wall part 8 liquid crystal display device 82 backlight unit (backlight)

Claims

A housing having a first reflecting portion facing the light exit surface;
The light emitting diodes are linearly arranged in a first direction which is a direction along the first reflecting portion, and the light emitting diodes are formed in a plurality of stages in a second direction intersecting the first direction. With a substrate,
In the array of light emitting diodes formed in a plurality of stages in the second direction, the number of light emitting diodes in the central stage is larger than the number of light emitting diodes in any other stage.
The housing has a disk portion;
The lighting device according to claim 1, wherein the plurality of substrates are respectively arranged near the center of the casing so as to emit light toward the outer periphery of the casing.
The housing has an outer wall portion protruding from the outer periphery of the disc portion,
The lighting device according to claim 2, further comprising a second reflecting portion along an inner side of the outer wall portion.
The housing has a disk portion;
The housing has an outer wall portion protruding from the outer periphery of the disc portion,
The lighting device according to claim 1, wherein the substrate is disposed along an inner side of the outer wall portion.
The housing has a rectangular flat plate portion;
The lighting device according to claim 1, wherein the substrate is disposed on a wall projecting from at least one side of the flat plate portion.
A backlight using the illumination device according to claim 5.
A liquid crystal display device comprising the backlight according to claim 6.
A television receiver comprising the liquid crystal display device according to claim 7.