JP2013131328A - Lighting device, and display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device capable of fixing a reflecting member, and yet, capable of irradiating light on an irradiated body so as luminance of the irradiated body in a plane direction to be uniform, as well as a display device equipped with the lighting device.SOLUTION: A backlight unit 1 is made provided with a frame member 13, a printed wiring board 12 fitted on the frame member 13, a plurality of light-emitting portions 111 fitted on the printed wiring board 12, a reflecting member 118 fitted around the light-emitting portions 111 and equipped with a main reflecting portion 1181 and a sub reflecting portion 1182, and a first fixing member 101 equipped with a slanted portion 1011 pressing the reflecting member 118 down to the frame member 13 for reflecting light emitted from the light-emitting portions 111 and an axis body 1012 continuing to the slanted portion 1011 to be fixed to the frame member 13.

Description

  The present invention relates to an illumination device that irradiates light on a back surface of a display panel, and a display device including the illumination device.

  In the display panel, liquid crystal is sealed between two transparent substrates, and when a voltage is applied, the orientation of the liquid crystal molecules is changed and the light transmittance is changed to optically display a predetermined image or the like. Is done. In this display panel, since the liquid crystal itself is not a light emitter, for example, the back side of the transmissive display panel is irradiated with light using a cold cathode tube (CCFL), a light emitting diode (LED), or the like as a light source. A backlight unit is provided.

  In the backlight unit, light sources such as cold-cathode tubes and LEDs are arranged on the bottom surface to emit light, and light sources such as cold-cathode tubes and LEDs are arranged on the edge of a transparent plate called a light guide plate. There is an edge light type that emits light to the front surface by dot printing or pattern shape provided on the back surface through light from the light plate edge.

  LEDs have excellent characteristics such as low power consumption, long life, and reduced environmental impact by not using mercury, but they are expensive in price, and until the blue LED is invented, the white LED is The absence of the light source and the strong directivity led to a delay in the use of the backlight unit as a light source. However, in recent years, high color rendering high-intensity white LEDs have been rapidly spreading for lighting applications, and the LEDs have become cheaper. Accordingly, as a light source of a backlight unit, there has been a transition from a cold cathode tube to an LED. Progressing.

  Since the LED has strong directivity, the edge light type is more effective than the direct type from the viewpoint of irradiating light so that the luminance of the surface of the display panel is uniform in the surface direction. However, the edge light type backlight unit has a problem that heat generated by the light source is concentrated due to the light source being concentrated on the edge portion of the light guide plate, and the bezel portion of the display panel is enlarged. Arise. Furthermore, the edge light type backlight unit has a great restriction on partial dimming control (local dimming), which is attracting attention as a control method capable of improving the quality and power saving of a display image. There is a problem that it is not possible to control a small divided area where high quality and power saving can be achieved.

  Therefore, in a direct-type backlight unit that is advantageous for partial dimming control, even when an LED with strong directivity is used as the light source, light is irradiated onto the display panel so that the luminance is uniform. There are ongoing studies of possible ways to do this.

  For example, Patent Document 1 discloses a light emitting element, a light guide reflector that guides light emitted from the light emitting element while reflecting the light emitted in a direction orthogonal to the optical axis, and the light emitting element. A light source unit including a vertically extending reflecting member and a frame for supporting them is described. In the light source unit described in Patent Document 1, the light emitted from the light emitting element is reflected by the reflecting member, and the luminance of the display panel is made uniform. This reflective member is affixed on the frame with an adhesive.

  Patent Document 2 describes a backlight unit in which a reflecting member for reflecting light emitted from a light emitting element is fixed to a frame with rivets. In the backlight unit described in Patent Document 2, a rivet is provided adjacent to the light emitting element.

JP 2010-238420 A JP 2011-34041 A

  The light source unit described in Patent Document 1 has a problem that the reflecting member is peeled off from the frame due to heat generated by the light emitting element. The backlight unit described in Patent Document 2 has a problem in that light is absorbed or reflected by the rivet because the rivet is present on the reflecting member, and the amount of light applied to the display panel becomes non-uniform.

  The present invention solves such problems, and irradiates the irradiated body with light so that the reflecting member can be fixed and the luminance in the surface direction of the irradiated body is uniform. An object of the present invention is to provide a lighting device that can perform the above-described operation and a display device including the lighting device.

The present invention is a plurality of light emitting units arranged in a row, a plurality of light emitting units that emit light toward the irradiated object,
A reflecting member provided around each light emitting unit and reflecting light emitted from the light emitting unit toward the irradiated body;
A main reflecting portion that extends in a direction perpendicular to the optical axis of the light emitting portion and whose outer shape when viewed in the optical axis direction is a polygonal shape;
A reflective member having a sub-reflective portion extending continuously to a side portion of the main reflective portion;
A support member for supporting the reflection member;
A fixing member for fixing the reflecting member to the support member;
The main reflection part is in contact with the corner part of the main reflection part of the reflection member that is fixed to the support member and is provided around at least one light emission part of the plurality of light emission parts. Hold down,
An illumination device comprising: a fixing member that reflects light emitted from the at least one light emitting unit toward the irradiated body.

Further, in the present invention, the sub-reflective portion extends with an inclination with respect to the main reflective portion,
The fixing member is
An inclined portion extending obliquely with respect to a main reflecting portion of a reflecting member provided around the at least one light emitting portion, and reflecting light emitted from the at least one light emitting portion toward the irradiated body An inclining portion that is in contact with a corner portion of the main reflecting portion of the reflecting member provided around the at least one light emitting portion and presses the main reflecting portion against the support member;
And a fixed portion that is provided integrally with the inclined portion and is fixed to the support member.

In the invention, it is preferable that the sub-reflecting portion connected to one of the two side portions sandwiching the corner portion of the main reflecting portion of the reflecting member provided around the at least one light emitting portion is the vertical direction. And incline away from the main reflection portion in the optical axis direction as the distance from the main reflection portion in one direction of
The inclined portion is in contact with a portion of the corner portion adjacent to the one side portion, and is inclined so as to be separated from the main reflecting portion in the optical axis direction as it is separated from the main reflecting portion in the one direction. It is characterized by.

According to the present invention, the sub-reflecting part connected to the other side part of the two side parts sandwiching the corner part of the main reflecting part of the reflecting member provided around the at least one light emitting part is the vertical direction. Are inclined so as to be separated from the main reflecting portion in the optical axis direction as they are separated from the main reflecting portion in another direction different from the one direction,
The fixing member is provided integrally with the fixing portion, and the main reflecting portion of the reflecting member provided around the at least one light emitting portion is arranged in the optical axis direction as the distance from the main reflecting portion in the other direction is increased. A second inclined portion extending obliquely away from the main reflecting portion and reflecting light emitted from the at least one light emitting portion, the reflection being provided around the at least one light emitting portion It has a 2nd inclined part which touches the part adjacent to said other side part among the corner | angular parts of the main reflection part of a member, and presses this main reflection part with respect to the said supporting member.

In the present invention, the plurality of light emitting units are arranged in a matrix.
The fixing member is provided between four light emitting units arranged adjacent to each other in a matrix, and each of the four light emitting units has the inclined portion and the second inclined portion.

  In the invention, it is preferable that the inclined portion has the same height in the optical axis direction as that of the adjacent sub-reflecting portion.

  In the invention, it is preferable that the inclined portion has a height in the optical axis direction higher than that of the adjacent sub-reflecting portion.

Further, the present invention is a connecting portion for connecting the four corner portions in contact with the inclined portion in the four light emitting portions, comprising a connecting portion in which a hole is formed in the center,
The support member is formed with a hole facing the hole of the connection part,
The fixing portion is a shaft body that extends in the optical axis direction and is inserted through the hole of the connection portion and the hole of the support member.

  The present invention is characterized in that the total reflectance of the inclined portion is substantially equal to the total reflectance of the sub-reflecting portion.

The present invention also includes a substrate on which the light emitting unit is mounted,
A retaining member provided in the hole of the support member,
The fixing portion is fixed in the hole of the support member via the retaining member,
A main reflecting portion of a reflecting member provided around the at least one light emitting portion is installed on the substrate, and the connecting portion is installed on the retaining member.

The present invention also provides a display panel,
A display device comprising the illumination device that irradiates light to the display panel.

The present invention also includes a diffusion plate provided between the display panel and the light emitting unit,
The fixing member is provided integrally with the fixing portion and has a support portion that supports the diffusion plate.

  According to the present invention, the reflecting member can be fixed by the fixing member, and the light emitted from the light emitting portion can be reflected toward the irradiated body by the fixing member. Thereby, the irradiated object can be irradiated with light so that the luminance in the surface direction of the irradiated object becomes uniform.

  Moreover, according to this invention, since the sub-reflection part of a reflection member inclines, light can be reflected toward an irradiated body so that the brightness | luminance in the surface direction of an irradiated body may become more uniform. Moreover, since the fixing member has the inclined portion, the inclined portion can reflect light toward the irradiated body so that the luminance in the surface direction of the irradiated body becomes more uniform.

  Further, according to the present invention, since the inclined portion of the fixing member is inclined in the same direction as the adjacent sub-reflecting portion, the luminance in the surface direction of the irradiated object can be made more uniform.

  According to the present invention, since the second inclined portion of the fixing member is inclined in the same direction as the adjacent sub-reflecting portion, the luminance in the surface direction of the irradiated object can be made more uniform.

  Moreover, according to this invention, the reflection member provided around each of the four light emission parts can be fixed with one fixing member.

  Further, according to the present invention, since the inclined portion of the fixing member has the same height as the adjacent sub-reflecting portion, the luminance in the surface direction of the irradiated body is more uniform when the irradiation range of the light emitting portion is sufficiently wide. Can be.

  Further, according to the present invention, since the inclined portion of the fixing member is higher than the adjacent sub-reflecting portion, the luminance in the surface direction of the irradiated object can be made more uniform when the irradiation range of the light emitting portion is narrow. .

  Further, according to the present invention, the fixing portion that is the shaft body is inserted into the hole of the connection portion and the hole of the supporting member, so that the fixing member is fixed to the supporting member. As a result, the supporting member and the reflecting member are Fixed.

  According to the present invention, since the inclined portion of the fixing member has a total reflectance substantially equal to the total reflectance of the sub-reflecting portion, the luminance in the surface direction of the irradiated object can be made more uniform.

  Moreover, according to this invention, the heat of a reflection member can be transmitted to a supporting member via a connection part and a retaining member, and can be radiated.

  Moreover, according to this invention, while being able to fix a reflection member, the brightness | luminance in the surface direction of a to-be-irradiated body can be equalize | homogenized.

  According to the invention, the diffusion plate can be prevented from being bent by supporting the diffusion plate by the support portion of the fixing member.

1 is an exploded view showing a liquid crystal display device 100. FIG. It is a figure which shows a mode when the diffusing plate 3 and the backlight unit 1 are planarly viewed from the liquid crystal panel 2 side. FIG. 3 is a diagram illustrating a state where the printed circuit board 12 is fixed to the bottom 131 of the frame member 13. FIG. 2 is an exploded view showing a printed circuit board 12 and a bottom 131 of a frame member 13. 2 is a plan view of a printed circuit board 12. FIG. It is a figure which shows the positional relationship of the LED chip 111a supported by the base 111b, and the lens 112. FIG. It is a figure which shows the base 111b and LED chip 111a. It is a figure which shows the LED chip 111a and the base 111b which are mounted in the printed circuit board 12. It is a figure which shows typically the optical path of the light radiate | emitted from LED chip 111a. 4 is a plan view of four reflecting members 118. FIG. FIG. 6 is a perspective view of one reflecting member 118. FIG. 3 is an end view of the liquid crystal display device 100 when cut along a line AA shown in FIG. 2. It is a top view of the several reflection member 118 integrally molded. 3 is a perspective view of a first fixing member 101. FIG. It is the top view and bottom view of the retaining member 104 before the 1st fixing member 101 is inserted. It is sectional drawing of the retaining member 104 when cut | disconnecting by the line BB shown in FIG. It is a figure showing a mode when the reflection member 118 shown in FIG. 13 is fixed to the bottom part 131 of the frame member 13 with the 1st fixing member 101, the 2nd fixing member 102, and the 3rd fixing member 103. It is sectional drawing of the liquid crystal display device 100 when it cut | disconnects by the line CC shown in FIG. It is a figure which shows embodiment which made the height of the inclination part 1011 high. It is a figure which shows embodiment which provided the 1st-3rd fixing members 101-103 every two or more. It is a figure which shows embodiment which was comprised so that all the light emission parts 111 might be provided on the two printed circuit boards 12. FIG. It is sectional drawing of the liquid crystal display device 100 when cut | disconnecting by the line DD shown in FIG.

  Below, the liquid crystal display device 100 provided with the backlight unit 1 which is embodiment of this invention is demonstrated. FIG. 1 is an exploded view of the liquid crystal display device 100. The liquid crystal display device 100 includes a backlight unit 1, a liquid crystal panel 2, and a diffusion plate 3.

  The liquid crystal panel 2 includes two substrates and is configured in a rectangular flat plate shape. The liquid crystal panel 2 is supported by the side wall portion 132 of the frame member 13 so that the bottom surface 131a of the bottom portion 131 of the frame member 13 included in the backlight unit 1 and the main surface of the liquid crystal panel 2 are substantially parallel. The liquid crystal panel 2 includes a switching element such as a thin film transistor (TFT), and liquid crystal is injected into a gap between the two substrates. The two substrates are provided with a driver (source driver) for controlling driving of pixels, various elements, and wiring. The liquid crystal panel 2 configured as described above displays an image on the display screen 2a which is one of the main surfaces when irradiated with light from the backlight unit 1.

  The diffusion plate 3 is a rectangular flat plate member. The diffusion plate 3 is supported between the liquid crystal panel 2 and the backlight unit 1 by the side wall portion 132 of the frame member 13 so that the main surface of the liquid crystal panel 2 and the main surface of the diffusion plate 3 are parallel to each other. . The diffusing plate 3 prevents the luminance of the display screen 2a from being locally biased by diffusing the light emitted from the backlight unit 1 in the surface direction of the diffusing plate 3.

  As another embodiment of the present invention, a prism sheet may be disposed between the liquid crystal panel 2 and the diffusion plate 3. The prism sheet converts the traveling direction of the light that has reached through the diffusion plate 3 into the thickness direction of the liquid crystal panel 2 to improve the luminance of the display screen 2a.

  FIG. 2 shows a state when the diffusing plate 3 and the backlight unit 1 are viewed in plan from the liquid crystal panel 2 side. The backlight unit 1 is a direct illumination device that irradiates light from the back side, which is the main surface opposite to the display screen 2a, with respect to the liquid crystal panel 2. The backlight unit 1 includes a plurality of light emitting devices 11 each having a light emitting unit 111 and a reflecting member 118, a plurality of printed circuit boards 12, and a frame member 13.

  The frame member 13 includes a flat bottom 131 that faces the liquid crystal panel 2 with a predetermined interval, and four side walls 132 that are connected to the bottom 131 and rise from the bottom 131. The bottom 131 has a rectangular shape when viewed in the thickness direction, and is slightly larger than the liquid crystal panel 2. The side wall part 132 rises toward the liquid crystal panel 2 from the two end parts forming the short side of the rectangle and the two end parts forming the long side when viewed in the thickness direction in the bottom part 131. It is formed. The thickness of the frame member 13 is, for example, 0.8 mm to 1.0 mm.

  FIG. 3 shows a state where the printed circuit board 12 is fixed to the bottom 131 of the frame member 13. FIG. 4 shows the printed circuit board 12 and the bottom 131 of the frame member 13 in an exploded manner. Further, FIG. 5 shows a plan view of the printed circuit board 12.

  The printed circuit board 12 is fixed to the bottom surface 131 a of the bottom 131 of the frame member 13. A plurality of light emitting units 111 are provided on the mounting surface 12 a of the printed circuit board 12. The printed circuit board 12 is a substantially rectangular plate-shaped member having a width of, for example, 10 mm and a thickness of, for example, 0.8 mm. The plurality of printed circuit boards 12 are provided in parallel in the width direction, for example, separated by 30 mm.

  The printed circuit board 12 is, for example, a substrate made of glass epoxy having a conductive pattern printed on both sides. The printed circuit board 12 extends to the side wall 132 of the frame member 13, and a connector 132 a provided on the side wall 132 for supplying power to the printed circuit board 12 is connected to the conductive pattern of the printed circuit board 12. . Each light emitting unit 111 on the printed circuit board 12 is supplied with power through the connector 132a and the conductive pattern.

  The printed circuit board 12 is formed with positioning round holes 12b, positioning long holes 12c, and a plurality of fixing long holes 12d. Positioning projections 131b and 131c formed on the bottom surface 131a of the bottom 131 of the frame member 13 are inserted into the positioning round hole 12b and the positioning long hole 12c, respectively. A fixing pin 12e is inserted into the fixing long hole 12d, and the fixing pin 12e is fixed in a fixing hole 131d formed in the bottom 131 of the frame member 13 through a pin receiving member 12f. .

As shown in FIG. 2, the plurality of light emitting devices 11 are arranged in a matrix. Each light emitting device 11 is formed in a square when viewed in a direction perpendicular to the bottom surface 131a of the bottom 131 of the frame member 13 (X direction), and the length of one side of the square is, for example, 55 mm. Each light-emitting device 11 is designed so that the amount of light in the area facing the square in the liquid crystal panel 2 is, for example, 6000 cd / m ² .

  The light emitting device 11 is provided around the light emitting unit 111 that emits light toward the liquid crystal panel 2 that is an object to be irradiated, and reflects the light emitted from the light emitting unit 111 toward the liquid crystal panel 2. And a reflecting member 118. The reflecting member 118 extends in a direction perpendicular to the X direction and is connected to the main reflecting portion 1181 and the main reflecting portion 1181 whose outer shape is a polygonal plate when viewed in the X direction. And a sub-reflecting portion 1182 that is a flat plate having a main surface that is inclined with respect to the main surface.

  The light emitting unit 111 includes a light emitting diode (LED) chip 111a, a base 111b that supports the LED chip 111a, and a lens 112. FIG. 6 is a diagram showing a positional relationship between the LED chip 111a supported by the base 111b and the lens 112. As shown in FIG. The base 111b is a member for supporting the LED chip 111a. The base 111b is formed in a square when the support surface for supporting the LED chip 111a is viewed in plan in the X direction, and the length L1 of one side of the square is, for example, 3 mm. Moreover, the X direction length of the base 111b is 1 mm, for example.

  FIG. 7 is a diagram showing the base 111b and the LED chip 111a, FIG. 7 (a) is a plan view, FIG. 7 (b) is a front view, and FIG. 7 (c) is a bottom view. . The base 111b includes a base main body 111g made of ceramic, resin, and the like, and two electrodes 111c provided on the base main body 111g. The LED chip 111a is a base main body that serves as a support surface of the base 111b. It is fixed to the central portion of the upper surface of 111g with an adhesive member 111f. The two electrodes 111c are spaced apart from each other, and are respectively provided over the top surface, the side surface, and the bottom surface of the base body 111g.

  The two electrodes 111c and two terminals (not shown) of the LED chip 111a are connected by two bonding wires 111d, respectively. The LED chip 111a and the bonding wire 111d are sealed with a transparent resin 111e such as silicon resin.

  FIG. 8 shows the LED chip 111a and the base 111b mounted on the printed circuit board 12. The LED chip 111a is mounted on the printed circuit board 12 via the base 111b, and emits light in a direction from the printed circuit board 12 to the liquid crystal panel 2. The direction of the optical axis S of the LED chip 111a is the X direction. The LED chip 111a is located at the center of the base 111b when the light emitting device 11 is viewed in plan in the X direction. In the plurality of light emitting devices 11, the light emission control by the LED chips 111 a can be controlled independently of each other. Thereby, the backlight unit 1 can perform partial dimming control (local dimming).

  When mounting the LED chip 111a and the base 111b on the printed circuit board 12, first, solder is respectively applied to the two connection terminal portions 121 of the conductive pattern provided in the printed circuit board 12, and the base body is attached to the solder. The base 111b and the LED chip 111a fixed to the base 111b are placed on the printed circuit board 12 by, for example, an automatic machine (not shown) so that the two electrodes 111c provided on the bottom surface of 111g match each other. The printed circuit board 12 on which the base 111b and the LED chip 111a fixed to the base 111b are placed is sent to a reflow bath that irradiates infrared rays, and the solder is heated to about 260 ° C., and the base 111b, the printed circuit board 12, Is soldered.

  The lens 112 shown in FIG. 6 is provided in contact with the base 111b so as to cover the LED chip 111a and the base 111b that supports the LED chip 111a, and the light emitted from the LED chip 111a is transmitted to the LED chip 111a. Reflected or refracted in a plurality of directions intersecting the optical axis S. The lens 112 is a transparent lens, and is made of, for example, silicon resin or acrylic resin.

  In the lens 112, an upper surface 112a that is a surface facing the liquid crystal panel 2 is formed to be curved with a depression at the center. Further, the side surface 112b is formed in a cylindrical side surface shape having the direction of the optical axis S of the LED chip 111a as the axial direction.

  The lens 112 is formed rotationally symmetrical around the optical axis S. In the lens 112, a diameter L2 of a cross section orthogonal to the optical axis S is, for example, 10 mm. The lens 112 extends outward with respect to the base 111b. That is, the lens 112 is larger than the base 111b in the direction perpendicular to the optical axis S of the LED chip 111a (the diameter L2 of the lens 112 is larger than the length L1 of one side of the support surface of the base 111b). As described above, the lens 112 is provided so as to extend outward with respect to the base 111b, so that the light emitted from the LED chip 111a can be diffused by the lens 112 over a wide range. The height H1 of the lens 112 is 4.5 mm, for example, and is smaller than the diameter L2. That is, the maximum length of the lens 112 in the direction perpendicular to the optical axis S of the LED chip 111a is larger than the height H1.

  As described above, the diameter L2 is made larger than the height H1 in order to reduce the thickness of the backlight unit 1 and to uniformly irradiate the liquid crystal panel 2 with light. In order to reduce the thickness of the backlight unit 1, it is necessary to reduce the height H1 of the lens 112, that is, to make the lens 112 as thin as possible. However, if the lens 112 is made thinner, uneven illuminance is likely to occur on the back surface of the liquid crystal panel 2, and as a result, uneven brightness is likely to occur on the display screen 2 a of the liquid crystal panel 2. In particular, when the distance between the adjacent LED chips 111a is long, the portion of the back surface of the liquid crystal panel 2 between the adjacent LED chips 111a is far away from the two LED chips 111a, and the amount of irradiation light decreases. Therefore, illuminance unevenness (luminance unevenness) easily occurs between the portion and the portion facing the LED chip 111a. In order to irradiate the light emitted from the LED chip 111a to a region far from the LED chip 111a via the lens 112, it is necessary to increase the diameter L2 of the lens 112 to some extent. In this embodiment, the lens 112 By making the diameter L2 of the light source larger than the height H1, the backlight unit 1 can be made thinner and the liquid crystal panel 2 can be uniformly irradiated with light.

  If the diameter L2 of the lens 112 is made smaller than the height H1 of the lens 112, it becomes difficult to make the backlight unit 1 thin and uniform, and the lens 112 is fitted to the LED chip 111a. In insert molding to form, the subject that a balance tends to worsen arises. Further, when soldering the light emitting unit 111 composed of the LED chip 111a and the base 111b and the insert-molded lens 112 to the printed circuit board 12, the balance is easily lost, and there is a problem in assembly.

  An upper surface 112a of the lens 112 faces the LED chip 111a and is parallel to the main surface of the diffusion plate 3, a first curved portion 1122 surrounding the central portion 1121, and a second surrounding the first curved portion. A curved portion 1123. On the surface of the lens 112, the central portion 1121, the second curved portion 1123, and the side surface 112 b of the upper surface 112 a become a transmission region that transmits the light emitted from the LED chip 111 a and reaching the inside of the lens 112. Further, the first curved portion 1122 of the upper surface 112a becomes a reflection region that reflects the light emitted from the LED chip 111a and reaching through the inside of the lens 112 toward the side surface 112b.

  In the present embodiment, the lens 112 has a reflection portion 119 that reflects light on the entire bottom surface thereof. The reflection portion 119 can be formed by attaching a silver or aluminum sheet or performing aluminum vapor deposition. The thickness of the reflecting part 119 is, for example, 50 μm, and the reflectance (total reflectance) for visible light emitted from the LED chip 111a is 98% or more. In addition, aluminum vapor deposition is performed by heating aluminum in a vacuumed container and adhering it to the bottom surface of the lens 112 which is a vapor deposition object.

  The central portion 1121 of the upper surface 112a is formed so that the center of the central portion 1121 (that is, the optical axis of the lens 112) is located on the optical axis S of the LED chip 111a at the center of the upper surface 112a. The central portion 1121 of the upper surface 112a is parallel to the light emitting surface of the LED chip 111a and is formed in a circular shape, and the circular diameter L3 is, for example, 1 mm. As another embodiment of the present invention, the shape of the central portion 1121 is a side shape of a virtual cone that has the circular bottom surface and protrudes toward the LED chip 111a instead of the circular shape. It may be.

  The central portion 1121 is formed for irradiating light to a region of the diffusing plate 3 that faces the central portion 1121. However, since the central portion 1121 is a portion facing the LED chip 111a, most of the light emitted from the LED chip 111a reaches the central portion 1121, and when most of the light is transmitted as it is, it faces the central portion 1121. The illuminance of the area to be markedly increased. Therefore, it is preferable that the shape of the central portion 1121 is the side shape of the cone. In the case of the conical side surface shape, most of the light is reflected by the central portion 1121 and less light is transmitted through the central portion 1121, so that the illuminance of the region facing the central portion 1121 can be suppressed.

  The first curved portion 1122 of the upper surface 112a is an annular curved surface that surrounds the outer peripheral edge portion of the central portion 1121 and continues to the outer peripheral edge portion, and this curved surface is outward about the optical axis S of the LED chip 111a. It extends to one side in the optical axis S direction (toward the liquid crystal panel 2) as it goes to and is curved to be convex inward and one in the optical axis S direction. Here, the outer peripheral edge portion is a portion that is the outermost portion around the optical axis S when viewed in plan in the direction of the optical axis S, and is a portion that makes one round around the optical axis S. In order to make the first curved portion 1122 a reflective region, the shape of the curved surface is designed so that the light emitted from the LED chip 111a is totally reflected.

  More specifically, of the light emitted from the LED chip 111a, the light that has reached the first curved portion 1122 is totally reflected by the first curved portion 1122, and then transmitted through the side surface 112b of the lens. Heading toward the main reflecting portion 1181. The light that reaches the main reflecting portion 1181 is diffused by the main reflecting portion 1181, and a part of the diffused light is irradiated to a region facing the main reflecting portion 1181 in the diffusion plate 3. Further, another part of the diffused light travels toward the sub-reflecting part 1182 of the reflecting member 118 and is diffused by the sub-reflecting part 1182, and the diffused light is irradiated to a region facing the sub-reflecting part 1182 in the diffusion plate 3. The In this way, it is possible to increase the amount of light applied to the region not facing the LED chip 111a.

  The first curved portion 1122 is formed such that the incident angle of the light emitted from the LED chip 111a is equal to or greater than the critical angle φ in order to totally reflect the light emitted from the LED chip 111a. For example, when the material of the lens 112 is an acrylic resin, the refractive index of the acrylic resin is “1.49” and the refractive index of air is “1”, and thus sin φ = 1.1 / 49. From this equation, the critical angle φ is 42.1 °, and the first curved portion 1122 is formed in a shape with an incident angle of 42.1 ° or more. For example, when the lens 112 is made of silicon resin, the refractive index of silicon resin is “1.43” and the refractive index of air is “1”, so sin φ = 1 / 1.43. . From this equation, the critical angle φ is 44.4 °, and the first curved portion 1122 is formed in a shape with an incident angle of 44.4 ° or more.

  The second curved portion 1123 of the upper surface 112a is connected to the outer peripheral edge of the first curved portion 1122, and the other in the optical axis S direction (away from the liquid crystal panel 2) as it goes outward with the optical axis S of the LED chip 111a as the center. Is an annular curved surface that is curved so as to protrude outward and in one direction in the optical axis S direction.

  Of the light emitted from the LED chip 111a, the light that has reached the second curved portion 1123 is refracted in the direction toward the light emitting portion 111 when passing through the second curved portion 1123, and the diffusing plate 3 and the reflecting member. Head to 118. The light reaching the reflection member 118 is diffused and travels toward the diffusion plate 3. Thus, the light traveling toward the diffusion plate 3 by the second curved portion 1123 is mainly irradiated to a region different from the region irradiated with light by the central portion 1121 and the first curved portion 1122 in the diffusion plate 3. The amount of light is complemented. Since the second curved portion 1123 needs to transmit light, the incident angle is less than 42.1 ° so as not to totally reflect the light emitted from the LED chip 111a.

  As described above, the lens 112 is formed with the first curved portion 1122 that totally reflects the light emitted from the LED chip 111a toward the side surface 112b of the lens 112 at the outer peripheral edge portion of the central portion 1121. A second curved portion 1123 that refracts the light emitted from the LED chip 111a is formed at the outer peripheral edge of the curved portion 1122. The LED chip 111a generally has high directivity, the amount of light near the optical axis S is extremely large, and the amount of light decreases as the light emission angle with respect to the optical axis S increases. Therefore, in order to increase the amount of light emitted to the region relatively far from the optical axis S of the LED chip 111a (that is, the optical axis of the lens 112), light having a large emission angle with respect to the optical axis S is directed to this region. Instead, it is necessary to direct light having a small emission angle to this region. In the present embodiment, as described above, the first curved portion 1122 that totally reflects the light toward the region is formed around the central portion 1121 through which the optical axis S passes. The amount of light irradiated to the can be increased. On the other hand, if the second curved portion 1123 is formed adjacent to the periphery of the central portion 1121, and the first curved portion 1122 is formed adjacent to the second curved portion 1123, The emission angle of the light traveling toward the first curved portion 1122 with respect to the optical axis S increases, and as a result, the amount of light that is totally reflected by the first curved portion 1122 and applied to the region is reduced.

  FIG. 9 is a diagram schematically showing an optical path of light emitted from the LED chip 111a. The light emitted from the LED chip 111 a enters the lens 112, and is reflected and refracted by the lens 112. Specifically, of the light incident on the lens 112, the light reaching the central portion 1121 is emitted toward the liquid crystal panel 2 in the direction of the arrow A1, and the light reaching the first curved portion 1122 is all The light that is reflected and emitted from the side surface 112b in the direction of the arrow A2 and reaches the second curved portion 1123 is refracted and emitted toward the liquid crystal panel 2 in the direction of the arrow A3 and the like.

  In the present embodiment, the LED chip 111a and the lens 112 are such that the center of the lens 112 (that is, the optical axis of the lens 112) is positioned on the optical axis S of the LED chip 111a, and the lens 112 is in contact with the LED chip 111a. In addition, it is formed in advance with high accuracy. As described above, the LED chip 111a and the lens 112 can be formed by previously aligning them by insert molding or fitting the LED chip 111a supported by the base 111b to the lens 112 molded into a predetermined shape. The method of combining can be mentioned. In the present embodiment, the LED chip 111a and the lens 112 are formed by being previously aligned by insert molding.

  When insert molding is performed, an upper surface mold and a lower surface mold are roughly used. Molding is performed by injecting a resin, which is a raw material of the lens 112, from a resin inlet into a space formed when the upper surface mold and the lower surface mold are combined. In addition, in a state where the LED chip 111a supported by the base 111b is held in the space formed when the upper surface mold and the lower surface mold are combined, the resin as the raw material of the lens 112 is injected from the resin injection port. You may make it shape | mold by doing. Thus, by forming the LED chip 111a and the lens 112 by insert molding, it is possible to align the lens 112 with high accuracy so that the lens 112 contacts the LED chip 111a. Accordingly, the backlight unit 1 can accurately reflect and refract the light emitted from the LED chip 111a by the lens 112 in contact with the LED chip 111a. Therefore, the diffusion plate shown in FIG. Even in the thinned liquid crystal display device 100 with a small distance H3 from 3 to the printed circuit board 12 (H3 is 6 mm, for example), the liquid crystal panel 2 can be irradiated with light whose intensity is uniform in the surface direction.

  Next, the reflecting member 118 will be described. FIG. 10 is a plan view of the four reflecting members 118. FIG. 10 corresponds to the four reflecting members 118 in the lower right corner in FIG. FIG. 11 is a perspective view of one reflecting member 118. FIG. 12 is an end view of the liquid crystal display device 100 taken along line AA shown in FIG. The reflecting member 118 is a member having a high reflectance, ideally 100%, with respect to the light emitted from the LED chip 111a. In the present embodiment, the reflecting member 118 is white and has a total reflectance of 95% to 98% with respect to the light emitted from the LED chip 111a. The reflectance of the material constituting the reflecting member 118 can be measured according to JIS K 7375.

  The reflecting member 118 is made of high-brightness PET (Polyethylene Terephthalate), aluminum, or the like. High-brightness PET is foamable PET containing a fluorescent agent, and examples thereof include E60V (trade name) manufactured by Toray Industries, Inc. The reflection member 118 has a polygonal shape, for example, a substantially square shape, when viewed in plan in the X direction. When the length of one side of the square shape is 55 mm, the reflection member 118 is located between the centers of adjacent reflection members 118. The interval is, for example, 55 mm to 58 mm.

  The main reflecting portion 1181 of the reflecting member 118 is a flat plate member having a thickness of 0.1 mm to 0.5 mm, and the outer shape when viewed in a plane in the X direction is a polygonal shape, for example, a square shape. The main reflecting portion 1181 is provided on the printed circuit board 12 so as to extend in a direction perpendicular to the optical axis S of the LED chip 111a, and each square side when viewed in plan in the X direction has a plurality of LED chips. It is formed so as to be parallel to the arrangement direction of 111a (the row direction or the column direction in the matrix-like arrangement).

  The main reflecting portion 1181 is provided with a circular opening at the center when viewed in plan in the X direction. The diameter of the circular opening is 10 mm to 13 mm, which is about the same as the diameter L2 of the lens 112 covering the LED chip 111a, and the light emitting unit 111 including the lens 112 is mounted on the printed circuit board 12. After that, when the reflecting member 118 is installed on the printed circuit board 12, the light emitting unit 111 is inserted into the opening.

  The sub-reflecting portion 1182 of the reflecting member 118 is a rectangular flat plate member having a thickness of 0.1 mm to 0.5 mm, and is provided continuously to the four side portions 1181a of the main reflecting portion 1181. Here, the side portion 1181a of the main reflecting portion 1181 means four corner portions 1181b among the portions that become the outer peripheral edge of the square main reflecting portion 1181 when the main reflecting portion 1181 is viewed in plan in the X direction. This is the part excluding. The outer peripheral edge portion of the square main reflection portion 1181 is a portion having a predetermined width that is the outermost centered on the optical axis S when viewed in plan in the optical axis S direction (X direction). This is a portion that goes around the axis S once. The predetermined width is, for example, a width of 1% to 5% of the length of one side of the square main reflecting portion 1181. The corner portion 1181b is an L-shaped portion including a corner point of the square main reflection portion 1181 when the main reflection portion 1181 is viewed in plan in the X direction, and is 2 along the side of the square shape. The length in one direction is a portion that is 1% to 10% of the length of each side.

  The main surface of each sub-reflective portion 1182 is inclined so as to move away from the printed circuit board 12 in the optical axis S direction and toward the diffuser plate 3 as it moves away from the main reflective portion 1181 in the direction perpendicular to the optical axis S direction of the LED chip 111a. And formed to extend. Since each sub-reflecting part 1182 is provided on a different side portion 1181a of the main reflecting part 1181, each sub-reflecting part 1182 is inclined in a different direction. However, it is preferable that the inclination angles of the sub-reflection portions 1182 with respect to the main reflection portion 1181 are all equal. For example, the inclination angle θ shown in FIG. 12 is 30 °. The inclination angle θ is not limited to 30 °, and can be appropriately set within a range of 0 ° or more and less than 90 °.

  As shown in FIG. 12, in the adjacent light emitting devices 11, the adjacent sub-reflecting portions 1182 are in contact with each other and form an inverted V shape. In the present embodiment, the fixing pin 12e and the pin receiving member 12f are provided in a space formed by the two sub-reflecting portions 1182 forming the inverted V shape and the bottom portion 131 of the frame member 13.

  The height H2 of the reflecting member 118 is, for example, 2.5 to 5 mm. Here, the height H2 is the distance in the X direction between the portion of the sub-reflecting portion 1182 that is farthest from the surface of the main reflecting portion 1181 in the X direction and the surface of the main reflecting portion 1181.

  The reflection members 118 configured as described above and provided in each of the plurality of light emitting devices 11 are preferably formed integrally with each other. As a method of integrally forming the plurality of reflecting members 118, when the reflecting member 118 is made of foamable PET, an extrusion molding process can be cited, and when the reflecting member 118 is made of aluminum, A press working can be mentioned. As described above, by integrally forming the reflecting members 118 respectively provided in the plurality of light emitting devices 11, it is possible to improve the accuracy of the arrangement positions of the respective light emitting units 111 with respect to the respective reflecting members 118. As a result, the reflecting members The light can be reflected by 118 so that the luminance of the irradiated object becomes more uniform in the surface direction. Further, by integrally forming the reflection member 118, the number of operations for attaching the reflection member 118 can be reduced during the assembly operation of the backlight unit 1, so that the efficiency of the assembly operation can be improved.

  When the plurality of reflecting members 118 are integrally formed, the sub-reflecting portions 1182 that form the inverted V-shape are continuously provided. In the present embodiment, the reflecting members 118 are also connected to each other in the portion other than the sub-reflecting portion 1182.

  FIG. 13 shows a plan view of a plurality of reflecting members 118 that are integrally molded. FIG. 13 corresponds to the four reflecting members 118 at the lower right corner in FIG. As shown in FIG. 13, in the present embodiment, a cross-shaped first connection portion 1183 is provided between four main reflection portions 1181 arranged adjacent to each other in a matrix, and the first connection portion 1183 Adjacent corner portions 1181b of the four main reflection portions 1181 are connected to each other. In the present embodiment, among the plurality of reflecting members 118 arranged in a matrix, between the two main reflecting portions 1181 arranged adjacent to each other on the outermost side of the backlight unit 1, Two connecting portions 1184 are provided, and the second connecting portion 1184 connects adjacent corner portions 1181b of the two main reflecting portions 1181. In the present embodiment, among the plurality of reflecting members 118 arranged in a matrix, an L-shaped fixing end is provided at a corner portion 1181b of the main reflecting portion 1181 provided at the corner and not adjacent to the other reflecting member 118. Unit 1185 is connected.

  The first connection portion 1183 is formed with a circular hole 1183a in the center when viewed in plan in the X direction. A circular hole larger than the hole 1183a (a hole 1311 shown in FIG. 18 described later) is formed in the bottom 131 of the frame member 13 so as to face the hole 1183a. In the present embodiment, the printed circuit board 12 is not disposed between the hole 1183a of the first connection portion 1183 and the hole of the bottom portion 131 of the frame member 13 that is formed to face the hole 1183a.

  The first connecting portion 1183 can be integrally formed from the same material as the reflecting member 118. In this embodiment, the thickness of the 1st connection part 1183 is equal to the thickness of the main reflection part 1181, and the surface which opposes the diffusion plate 3 becomes the same plane shape.

  The second connection portion 1184 is formed with a circular hole 1184a at the center when viewed in plan in the X direction. A circular hole larger than the hole 1184a is formed in the bottom 131 of the frame member 13 so as to face the hole 1184a. In the present embodiment, the printed circuit board 12 is not disposed between the hole 1184a of the second connection portion 1184 and the hole of the bottom portion 131 of the frame member 13 that is formed to face the hole 1184a.

  The second connecting portion 1184 can be integrally formed from the same material as the reflecting member 118. In the present embodiment, the thickness of the second connection portion 1184 is equal to the thickness of the main reflection portion 1181, and the surface facing the diffusion plate 3 is in the same plane.

  The fixing end portion 1185 is formed with a circular hole 1185a at a corner portion when viewed in plan in the X direction. A circular hole larger than the hole 1185a is formed in the bottom 131 of the frame member 13 so as to face the hole 1185a. In the present embodiment, the printed circuit board 12 is not disposed between the hole 1185a of the fixing end 1185 and the hole of the bottom 131 of the frame member 13 formed to face the hole 1185a.

  The fixing end 1185 can be integrally formed from the same material as the reflecting member 118. In the present embodiment, the thickness of the fixing end portion 1185 is equal to the thickness of the main reflection portion 1181, and the surface facing the diffusion plate 3 is in the same plane.

  Such a reflection member 118 includes a bottom 131 of the frame member 13 by the first fixing member 101, the second fixing member 102, the third fixing member 103, and the retaining member 104 into which any one of them is inserted. Fixed against. FIG. 14 is a perspective view of the first fixing member 101. 14A shows a state when the first fixing member 101 is viewed from the diffusion plate 3 side, and FIG. 14B shows a state when the first fixing member 101 is viewed from the bottom 131 side of the frame member 13. The state of is expressed. FIG. 15 is a plan view and a bottom view of the retaining member 104 before the first fixing member 101 is inserted. FIG. 16 is a cross-sectional view of the retaining member 104 taken along line BB shown in FIG. FIG. 17 is a diagram illustrating a state when the reflecting member 118 illustrated in FIG. 13 is fixed to the bottom 131 of the frame member 13 by the first fixing member 101, the second fixing member 102, and the third fixing member 103. . FIG. 18 is a cross-sectional view of the liquid crystal display device 100 taken along line CC shown in FIG.

  The first fixing member 101 includes an inclined portion 1011, a fixing portion, and a support portion. The fixed part and the support part form a substantially cylindrical shaft body 1012. The shaft body 1012 extends in the X direction and has a truncated cone shape with a distal end portion on the diffusion plate 3 side being tapered. The shaft body 1012 contacts the diffusion plate 3 at the tip on the diffusion plate 3 side and supports the diffusion plate 3. Thereby, bending of the diffusion plate 3 can be prevented. It should be noted that the shaft body 1012 is preferably point-contacted with the diffusion plate 3 so that it does not darken at the contact point with the diffusion plate 3, but there is a problem in strength, so that the tip is made into a truncated cone shape.

  The end of the shaft member 1012 of the first fixing member 101 on the frame member 13 side is inserted into the hole 1183a of the first connecting portion 1183 and the hole 1311 of the bottom 131 of the frame member 13, and a retaining member provided in the hole 1311. It is fixed in this hole 1311 through 104. The retaining member 104 has four rod-shaped portions 104a and an annular portion 104b, and the rod-shaped portion 104a has an inner interval W1 from the diffusion plate 3 side toward the bottom 131 side of the frame member 13. Is provided to be narrow. The distance W1 on the diffusion plate 3 side is substantially equal to the diameter of the shaft body 1012, and the distance W1 on the bottom 131 side of the frame member 13 is less than the diameter of the shaft body 1012. The opening diameter of the annular portion 104b is substantially equal to the diameter of the shaft body 1012. Further, the diameter of the hole 1183 a of the first connection portion 1183 is also substantially equal to the diameter of the shaft body 1012. Further, the interval W2 outside the rod-shaped portion 104a is equal to the diameter of the hole 1311.

  When the shaft body 1012 of the first fixing member 101 is inserted into the space between the four rod-like portions 104a inserted through the holes 1311 of the bottom 131 of the frame member 13, as shown in FIG. The rod-shaped portions 104a of the first and second rods 104a are deformed to move away from the shaft body 1012. As a result, the shaft body 1012 is fixed to the bottom 131 of the frame member 13.

  At this time, as shown in FIG. 18, the tip of the end of the shaft body 1012 on the frame member 13 side protrudes from the hole 1311. Further, the thickness of the annular portion 104b of the retaining member 104 through which the shaft body 1012 is inserted is equal to the thickness of the printed circuit board 12, and the first connection portion 1183 is supported by the annular portion 104b, and the first connection portion. The surface facing the diffusion plate 3 of 1183 and the surface facing the diffusion plate 3 of the main reflection portion 1181 supported by the printed circuit board 12 are coplanar. Thus, when the 1st connection part 1183 contacts the retaining member 104, the heat of the reflection member 118 can be transmitted to the bottom part 131 of the frame member 13, and can be radiated.

  The retaining member 104 and the first to third fixing members 101 to 103 can be molded from a white resin material or metal material using a mold. When the retaining member 104 is made of metal, the heat dissipation effect can be further enhanced.

  The inclined portion 1011 of the first fixing member 101 is connected to the central portion of the shaft body 1012 in the X direction. The inclined portions 1011 are respectively provided corresponding to the four main reflecting portions 1181 that are connected to the first connecting portion 1183 through which the shaft body 1012 is inserted. Further, each inclined portion 1011 has two portions inclined in different directions with respect to the corresponding main reflecting portion 1181, and one portion is called a first inclined portion 1011a and the other portion is a first portion. This is referred to as two inclined portions 1011b.

  The first inclined portion 1011 a and the second inclined portion 1011 b are in contact with the corner portion 1181 b of the corresponding main reflecting portion 1181 that is continuous with the first connecting portion 1183, and the main reflecting portion 1181 is in contact with the bottom 131 of the frame member 13. Press down. More specifically, the first inclined portion 1011a is one side portion of two side portions 1181a sandwiching the corner portion 1181b among the corner portions 1181b connected to the first connection portion 1183 of the corresponding main reflecting portion 1181. Is adjacent to a portion (referred to as a “first portion”). The second inclined portion 1011b is a portion adjacent to the other side portion of the two side portions sandwiching the corner portion 1181b among the corner portions 1181b connected to the first connecting portion 1183 of the corresponding main reflecting portion 1181 (“the first side”). 2 parts "). As described above, since the shaft body 1012 of the first fixing member 101 is fixed in the hole 1311 of the bottom 131 of the frame member 13, the first inclined portion 1011a and the second inclined portion 1011b connected to the shaft body 1012 are also frame members. As a result, the reflecting member 118 having the main reflecting portion 1181 pressed by the first inclined portion 1011a and the second inclined portion 1011b is also fixed to the frame member 13.

  The first inclined portion 1011a extends while inclining in the same direction as the sub-reflecting portion 1182 provided in the side portion 1181a adjacent to the first portion. In the present embodiment, the first inclined part 1011a not only inclines in the same direction as the sub-reflecting part 1182 but also has the same inclination angle as the sub-reflecting part 1182 and the same height in the X direction as the sub-reflecting part 1182. It is. Therefore, as shown in FIG. 17, the first inclined portion 1011a and the sub-reflecting portion 1182 are provided continuously. Instead of being continuously provided, the first inclined portion 1011a and the sub-reflecting portion 1182 may be provided separately within a range of greater than 0 mm and less than or equal to 0.5 mm.

  The 2nd inclination part 1011b is comprised similarly to the 1st inclination part 1011a. In other words, the second inclined portion 1011b extends in an inclined direction in the same direction as the sub-reflecting portion 1182 provided in the side portion 1181a adjacent to the second portion. And the height in the X direction is the same as that of the sub-reflecting portion 1182.

  The total reflectance of the inclined portion 1011 is substantially equal to the total reflectance of the sub-reflecting portion 1182 and is, for example, about 90%. Here, “substantially equal” means that the total reflectance of the inclined portion 1011 is within the range of the total reflectance ± 10% of the sub-reflecting portion 1182. As described above, the first inclined portion 1011 a and the second inclined portion 1011 b are inclined in the same direction as the adjacent sub-reflecting portion 1182, and the total reflectance is substantially equal to the total reflectance of the sub-reflecting portion 1182. Therefore, the light emitted from the light emitting unit 111 surrounded by the sub-reflecting unit 1182 can be reflected toward the liquid crystal panel 2.

  The second fixing member 102 is configured such that the number of inclined portions 1011 of the first fixing member 101 is changed from four to two, and is substantially T-shaped when viewed in plan in the X direction. The shaft of the second fixing member 102 is inserted into the hole 1184a of the second connecting portion 1184 and the hole of the bottom 131 of the frame member 13 opposite to the hole 1184a, and is inserted into the hole via the retaining member 104. Fixed. The two inclined portions connected to the shaft of the second fixing member 102 respectively press the corner portions 1181b of the two main reflecting portions 1181 connected to the second connecting portion 1184, and emit light corresponding to the main reflecting portion 1181. The light emitted from the unit 111 is reflected toward the liquid crystal panel 2.

  The third fixing member 103 is configured such that the number of the inclined portions 1011 of the first fixing member 101 is changed from four to one and is substantially rectangular when viewed in plan in the X direction. The shaft of the third fixing member 103 is inserted into the hole 1185a of the fixing end 1185 and the hole of the bottom 131 of the frame member 13 opposite to the hole 1185a, and is inserted into the hole via the retaining member 104. Fixed. The two inclined portions connected to the shaft of the third fixing member 103 press the corner portion 1181b of one main reflecting portion 1181 connected to the fixing end portion 1185, and the light emitting portion corresponding to the main reflecting portion 1181. The light emitted from 111 is reflected toward the liquid crystal panel 2.

  In the present embodiment, the reflecting member 118 can be fixed by the first to third fixing members 101 to 103 as described above, and the light emitted from the light emitting unit 111 is reflected toward the liquid crystal panel 2. Thus, the liquid crystal panel 2 can be irradiated with light so that the luminance in the surface direction of the liquid crystal panel 2 is uniform. In addition, as this invention, it is not necessary to provide all the 1st-3rd fixing members 101-103, and what is necessary is just to provide any 1 type at least.

  As described above, in the present embodiment, the height of the inclined portion 1011 is equal to the height of the adjacent sub-reflecting portion 1182. On the other hand, as another embodiment of the present invention, the height of the inclined portion 1011 may be higher than the height of the adjacent sub-reflecting portion 1182. FIG. 19 shows an embodiment in which the height of the inclined portion 1011 is increased. In the first fixing member 101 in this embodiment, the size of the inclined body 1011 is enlarged within a range of more than 1 time and less than 3 times while maintaining the inclination angle while keeping the size of the shaft body 1012 unchanged. Is. The height of the inclined portion 1011 is increased in this way when the height of the inclined portion 1011 is equal to the height of the adjacent sub-reflecting portion 1182 on the liquid crystal panel 2 facing the corner portion 1181b with which the inclined portion 1011 contacts. This is the case when the area becomes dark. For example, when the irradiation range of the light emitting unit 111 is narrow or the total reflectance of the inclined part 1011 is low, if the height of the inclined part 1011 is equal to the height of the adjacent sub-reflecting part 1182, the angle at which the inclined part 1011 touches. A region on the liquid crystal panel 2 facing the portion 1181b becomes dark. Therefore, by increasing the height as shown in FIG. 19, the amount of irradiation light can be made uniform, and the luminance unevenness of the liquid crystal panel 2 can be reduced. As another embodiment of the present invention, the height of the inclined portion 1011 may be increased, the inclination angle of the inclined portion 1011 may be increased, and the height of the inclined portion 1011 may be set to the height of the sub-reflecting portion 1182. You may enlarge the inclination-angle of the inclination part 1011 with making it equal. Increasing the inclination angle of the inclined portion 1011 can also achieve the effect of making the amount of irradiation light uniform as described above.

  In the present embodiment, any one of the first to third fixing members 101 to 103 is provided on all the corner portions 1181b of all the main reflecting portions 1181, but not all of them. For example, as shown in FIG. 20, first to third fixing members 101 to 103 may be provided every other plurality. In the embodiment shown in FIG. 20, the first connecting portion 1183, the second connecting portion 1184, and the fixing end portion 1185 are not formed in the corner portion 1181b where the first to third fixing members 101 to 103 are not provided. Instead, the second sub-reflecting portion 1186 having the same shape as the inclined portions of the first to third fixing members 101 to 103 is formed. When the height and inclination angle of the inclined portions of the first to third fixing members 101 to 103 are equal to the height and inclination angle of the sub-reflecting portion 1182, the second sub-reflecting portion 1186 is smoothly connected to the sub-reflecting portion 1182. Formed as follows.

  In the embodiment shown in FIG. 20, unlike the embodiment shown in FIG. 2, all the light emitting units 111 are provided on one printed circuit board 12. Further, as an embodiment of the present invention, as shown in FIG. 21, all the light emitting units 111 may be provided on two printed circuit boards 12.

  In the embodiment shown in FIGS. 20 and 21, since the printed circuit board 12 is installed under the corner portion 1181b of the main reflection portion 1181, the hole 1183a of the first connection portion 1183 connected to the corner portion 1181b and the hole The printed circuit board 12 exists between the hole 1311 of the bottom 131 of the frame member 13 facing the 1183a. Therefore, in this embodiment, as shown in FIG. 22, a hole 122 through which the shaft body 1012 of the first fixing member 101 is inserted is formed in the printed circuit board 12.

  22 is a cross-sectional view of the liquid crystal display device 100 taken along line DD shown in FIG. In the embodiment shown in FIG. 22, the hole 1183a of the first connection portion 1183 and the outer diameter of the annular portion 104b of the retaining member 104 are substantially equal, the interval W2 outside the rod-like portion 104a, and the hole of the printed circuit board 12. The diameter of 122 is equal to the diameter of the hole 1311 in the bottom 131 of the frame member 13. According to such an embodiment, the reflection member 118 can be fixed to the bottom 131 of the frame member 13 by the first fixing member 101, and the printed circuit board 12 can also be fixed.

DESCRIPTION OF SYMBOLS 1 Backlight unit 2 Liquid crystal panel 3 Diffusion plate 11 Light-emitting device 12 Printed circuit board 13 Frame member 100 Liquid crystal display device 101 1st fixing member 102 2nd fixing member 103 3rd fixing member 104 Retaining member 111 Light-emitting part 118 Reflecting member 1011 Inclination Part 1011a First inclined part 1011b Second inclined part 1012 Shaft body 1181 Main reflecting part 1182 Sub reflecting part 1183 First connecting part 1184 Second connecting part 1186 Second sub reflecting part

Claims (12)

A plurality of light emitting units arranged in a row, a plurality of light emitting units emitting light toward the irradiated body; and
A reflecting member provided around each light emitting unit and reflecting light emitted from the light emitting unit toward the irradiated body;
A main reflecting portion that extends in a direction perpendicular to the optical axis of the light emitting portion and whose outer shape when viewed in the optical axis direction is a polygonal shape;
A reflective member having a sub-reflective portion extending continuously to a side portion of the main reflective portion;
A support member for supporting the reflection member;
A fixing member for fixing the reflecting member to the support member;
The main reflection part is in contact with the corner part of the main reflection part of the reflection member that is fixed to the support member and is provided around at least one light emission part of the plurality of light emission parts. Hold down,
An illuminating apparatus comprising: a fixing member that reflects light emitted from the at least one light emitting unit toward the irradiated body. The sub-reflective portion extends with an inclination with respect to the main reflective portion,
The fixing member is
An inclined portion extending obliquely with respect to a main reflecting portion of a reflecting member provided around the at least one light emitting portion, and reflecting light emitted from the at least one light emitting portion toward the irradiated body An inclining portion that is in contact with a corner portion of the main reflecting portion of the reflecting member provided around the at least one light emitting portion and presses the main reflecting portion against the support member;
The lighting device according to claim 1, further comprising: a fixed portion that is provided integrally with the inclined portion and is fixed to the support member. Of the two side portions sandwiching the corner portion of the main reflecting portion of the reflecting member provided around the at least one light emitting portion, the sub-reflecting portion connected to one side portion is one direction of the vertical directions. And incline so as to be separated from the main reflection part in the optical axis direction as it is away from the main reflection part in
The inclined portion is in contact with a portion of the corner portion adjacent to the one side portion, and is inclined so as to be separated from the main reflecting portion in the optical axis direction as it is separated from the main reflecting portion in the one direction. The lighting device according to claim 2, wherein Of the two side portions sandwiching the corner portion of the main reflecting portion of the reflecting member provided around the at least one light emitting portion, the sub-reflecting portion connected to the other side portion is the vertical direction in the vertical direction. Inclining away from the main reflecting portion in the optical axis direction as it is away from the main reflecting portion in another direction different from one direction,
The fixing member is provided integrally with the fixing portion, and the main reflecting portion of the reflecting member provided around the at least one light emitting portion is arranged in the optical axis direction as the distance from the main reflecting portion in the other direction is increased. A second inclined portion extending obliquely away from the main reflecting portion and reflecting light emitted from the at least one light emitting portion, the reflection being provided around the at least one light emitting portion The second inclined portion that contacts a portion adjacent to the other side portion of the corner portion of the main reflection portion of the member and presses the main reflection portion against the support member. 3. The lighting device according to 3. The plurality of light emitting units are arranged in a matrix.
The said fixing member is provided between the four light emission parts arrange | positioned adjacent to a matrix form, Each of these four light emission parts has the said inclination part and the said 2nd inclination part, It is characterized by the above-mentioned. 4. The lighting device according to 4.   The lighting device according to claim 1, wherein the inclined portion has the same height in the optical axis direction as that of the adjacent sub-reflecting portion.   The lighting device according to claim 1, wherein the inclined portion has a height in the optical axis direction higher than that of the adjacent sub-reflecting portion. In the four light emitting parts, a connecting part connecting the four corners that the inclined part contacts, wherein the connecting part is formed with a hole in the center,
The support member is formed with a hole facing the hole of the connection part,
The lighting device according to claim 5, wherein the fixing portion is a shaft body that extends in the optical axis direction and is inserted into the hole of the connection portion and the hole of the support member.   The lighting device according to claim 1, wherein a total reflectance of the inclined portion is substantially equal to a total reflectance of the sub-reflecting portion. A substrate on which the light emitting unit is mounted;
A retaining member provided in the hole of the support member,
The fixing portion is fixed in the hole of the support member via the retaining member,
9. The main reflecting portion of a reflecting member provided around the at least one light emitting portion is installed on the substrate, and the connecting portion is installed on the retaining member. The lighting device described in 1. A display panel;
A display device comprising the illumination device according to claim 1, which irradiates light to the display panel. A diffusion plate provided between the display panel and the light emitting unit;
The display device according to claim 11, wherein the fixing member includes a support portion that is provided integrally with the fixing portion and supports the diffusion plate.

Images