HK1170290A - Lighting device, display apparatus, and television receiving equipment - Google Patents

Description

Illumination device, display device, and television receiver

Technical Field

The invention relates to an illumination device, a display device and a television receiver.

Background

For example, a liquid crystal panel used in a liquid crystal display device such as a liquid crystal television does not emit light by itself, and therefore a backlight device is additionally required as an illumination device. The backlight device is provided on the back side (the side opposite to the display surface) of the liquid crystal panel, and includes: a chassis having an opening on a liquid crystal panel side; a light source housed within the base; a reflection sheet arranged along the inner surface of the chassis and reflecting light toward the opening of the chassis; and an optical member (e.g., a diffusion sheet) disposed in the opening of the base and configured to efficiently emit light generated by the light source toward the liquid crystal panel. In some cases, for example, LEDs are used as light sources in the components of the backlight device, and in this case, an LED substrate on which the LEDs are mounted is housed in a chassis.

Patent document 1 described below discloses an example of a backlight device using LEDs as light sources.

Documents of the prior art

Patent articleDocument (A)

Patent document 1: japanese unexamined patent publication No. 2007-317423

Disclosure of Invention

Problems to be solved by the invention

However, in order to realize a large screen in a liquid crystal display device including the LED substrates as described above, a method of connecting a plurality of LED substrates in series may be used. In this case, a connector is mounted to each LED substrate, and the connectors of the adjacent LED substrates are connected to each other. Here, when the connector is mounted on the same mounting surface as the LED in the LED substrate, the following problem may occur. That is, since a step is formed between the connector and the mounting surface of the LED substrate, when a reflection sheet for reflecting light in the chassis is arranged along the mounting surface, the reflection sheet easily gets over the connector or the like and deforms the reflection sheet. When the reflection sheet is deformed, unevenness in reflected light may occur, and as a result, luminance unevenness may occur in light emitted from the backlight device.

The present invention has been made in view of the above circumstances, and an object thereof is to make unevenness of emitted light difficult to occur.

Means for solving the problems

The lighting device of the present invention includes: a light source; a light source substrate on which the light source is mounted; a mounting member mounted on a mounting surface of the light source substrate on the same side as the light source; a reflecting member that is disposed on a mounting surface side of the light source and the mounting component in the light source substrate and reflects light; and a support portion that supports the reflection member at a position separated from the mounting surface of the light source substrate.

In this way, the reflecting member is disposed on the light source substrate on the mounting surface side of the light source and the mounting component, and is supported by the supporting portion at a position separated from the mounting surface. However, since the reflecting member disposed on the mounting surface side is supported by the supporting portion at a position spaced apart from the mounting surface, the reflecting member is less likely to be deformed, and unevenness in light reflected by the reflecting member is less likely to occur. Further, since the light source substrate is of a so-called single-sided mounting type in which the light source and the mounting member are mounted on the same mounting surface, it is possible to reduce the manufacturing cost.

In addition, in order to prevent the deformation of the reflecting member, for example, a method of forming a hole for passing the mounting member in the reflecting member is conceivable, but when such a method is adopted, the mounting member is exposed through the hole, and therefore, uniformity of the light reflectance may be impaired. In this regard, according to the present invention, since the hole is not formed in the reflective member, the deformation of the reflective member can be prevented, and thus the uniformity of the light reflectance can be maintained.

The embodiment of the present invention is preferably configured as follows.

(1) The support portion is formed to support the reflecting member at a position separated from a surface of the mounting member on a side opposite to the light source substrate side. In this way, the reflecting member can be held in a non-contact state with respect to the mounting member by the support portion, and therefore, the reflecting member can be reliably prevented from being deformed by the mounting member, and the flatness of the reflecting member can be maintained well.

(2) The support portion is formed to support the reflecting member at a position flush with a surface of the mounting member on a side opposite to the light source substrate. Thus, the flatness of the reflecting member can be maintained by the supporting portion, and the space between the light source substrate and the reflecting member can be kept to a minimum. As the distance increases, the optical path length of light reflected by the reflecting member to exit becomes shorter, and thus even if the reflecting member is slightly deformed, luminance unevenness tends to be easily generated. In this regard, according to the present invention, since the interval is set to the minimum necessary, the optical path length of light from the reflecting member to the exit can be sufficiently secured, and even if the reflecting member is slightly deformed, the luminance unevenness is less likely to occur.

(3) The light source device includes a base having an opening for emitting light from the light source, and housing the light source substrate and the reflecting member. In this way, light emitted from the light source of the light source substrate housed in the chassis is emitted from the opening directly or indirectly by reflection by the reflecting member or the like.

(4) The support part is integrally provided on the base. In this way, the reflecting member can be supported by the supporting portion integrally provided to the base. If the support portion is integrally provided on the light source substrate, there is a possibility that the support position of the support portion with respect to the reflecting member may be deviated due to an assembly error or the like generated between the light source substrate and the base, and it is difficult to generate such a deviation according to the present invention.

(5) The support portion is integrally formed with the base. In this way, the number of parts and the number of assembly steps can be reduced compared to a case where the support portion is provided separately from the base, and therefore the support portion can be provided at low cost.

(6) The support portion includes a substrate overlapping support portion disposed at a position overlapping the light source substrate in a plan view, and the light source substrate is provided with a through hole through which the substrate overlapping support portion passes. In this way, the substrate-overlapping support portion is passed through the through hole, whereby the light source substrate can be positioned in the direction along the plate surface thereof.

(7) The support portion includes a substrate non-overlapping support portion disposed at a position not overlapping with the light source substrate in a plan view, and at least one pair of the substrate non-overlapping support portions are disposed at positions sandwiching the light source substrate in a plan view. In this way, the reflecting member is supported by at least a pair of substrate non-overlapping supporting portions disposed so as to sandwich the light source substrate, whereby the flatness of the reflecting member can be further favorably maintained.

(8) The plurality of substrate non-overlapping support portions are arranged in parallel along an outer edge of the light source substrate. In this way, the flatness of the reflecting member can be further favorably maintained by the plurality of substrate non-overlapping supporting portions arranged in parallel along the outer edge of the light source substrate.

(9) The substrate non-overlapping support part extends along the outer edge of the light source substrate. In this way, the flatness of the reflecting member can be further favorably maintained by the substrate non-overlapping support portion in a form extending along the outer edge of the light source substrate.

(10) The above-mentioned reflecting member includes: a substrate reflection member arranged to overlap the mounting surface of the light source substrate; and a base reflection member disposed along an inner surface of the base and closer to the opening than the substrate reflection member, wherein the support portion is formed to support the base reflection member at a position separated from a surface of the substrate reflection member closer to the opening. In this way, as compared with the case where the reflecting member for a chassis is disposed so as to overlap the surface of the reflecting member for a substrate on the opening side, it is difficult for the reflecting member for a chassis to be deformed due to the step generated between the mounting component and the reflecting member for a substrate. Thus, the light reflected by the reflecting member for the chassis and emitted from the opening is less likely to be uneven.

(11) The light source device includes a substrate holding member for holding the light source substrate by being sandwiched between the substrate holding member and the base. Thus, the light source substrate on which the mounting component is mounted can be held between the substrate holding member and the chassis. This can maintain the positional relationship of the mounting member with respect to the reflecting member in an appropriate state.

(12) The support portion is integrally provided to the substrate holding member. In this way, the reflecting member can be supported by the supporting portion integrally provided to the substrate holding member.

(13) A hole portion for passing at least light from the light source is provided in a position of the reflecting member overlapping the light source in a plan view. Thus, light emitted from the light source can exit through the hole portion. It is possible to avoid the light source substrate from interfering with the light emission by the reflecting member disposed on the light source mounting surface side.

(14) A diffusion lens for diffusing and emitting light from the light source is mounted at a position overlapping the light source in a plan view on the light source substrate, and the hole has a size at least allowing the light from the diffusion lens to pass therethrough. In this way, light from the light source can be diffused by the diffusion lens and emitted, and the light can be emitted through the hole. This is further suitable for preventing luminance unevenness.

(15) The support portion is formed to support the reflection member at a position separated from the diffusion lens to a side opposite to the mounting surface of the light source substrate. In this way, the reflecting member can be reliably held in a non-contact state with respect to the diffusion lens by the support portion, and therefore the reflecting member can be reliably prevented from being deformed by the diffusion lens, and the flatness of the reflecting member can be favorably maintained.

(16) The hole is sized to allow the diffusion lens to pass therethrough, and the support portion is formed to support the reflection member at a position where the diffusion lens is disposed in the hole. In this way, the gap between the light source substrate and the reflecting member can be made smaller than in the case where the reflecting member is supported at a position separated from the diffusion lens. As the distance increases, the optical path length of light reflected by the reflecting member to exit becomes shorter, and therefore the reflecting member is slightly deformed, and luminance unevenness tends to be easily generated. In this regard, according to the present invention, since the interval can be made small, the optical path length of light from the reflecting member to the exit can be sufficiently secured, and even if the reflecting member is slightly deformed, the luminance unevenness is less likely to occur.

(17) The reflection member is held between the holding member and the support portion. Thus, the reflecting member can be held by being sandwiched between the holding member and the supporting portion. This can maintain the positional relationship of the reflecting member with respect to the mounting member in a more appropriate state.

(18) The support portion includes a holed support portion provided with a fitting hole therein, and the holding member includes: a main body portion that sandwiches the reflecting member between the main body portion and the perforated support portion; and a fixing portion protruding from the main body portion toward the hole support portion and locked to a hole edge of the fitting hole through the fitting hole. Since the fixing portion passing through the attachment hole of the hole support portion is locked to the hole edge in this manner, the fixing of the holding member can be achieved, and therefore, it is not necessary to use another fixing member such as an adhesive, and the fixing can be achieved easily at low cost.

(19) The support portion includes a non-hole support portion having no fitting hole in addition to the hole-formed support portion. In this way, the support portion includes the support portion without the hole having the fitting hole, and therefore, the support can be performed also for the area of the reflection member where the holding member is not fitted. This can further keep the flatness of the reflecting member favorable.

(20) The mounting member includes a connecting member for connecting the adjacent light source substrates to each other. Thus, the deformation of the reflecting member caused by the connecting member can be prevented.

(21) The light source is an LED. Thus, high brightness, low power consumption, and the like can be achieved.

In order to solve the above problems, a display device according to the present invention includes: the lighting device described above; and a display panel for displaying by using the light from the illumination device.

According to such a display device, in the illumination device that supplies light to the display panel, the reflection member is less likely to be deformed, and thus unevenness in luminance is less likely to occur in the emitted light, and display with good display quality can be realized.

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

Effects of the invention

According to the present invention, unevenness is less likely to occur in the emitted light.

Drawings

Fig. 1 is an exploded perspective view showing a schematic configuration of a television receiving apparatus according to embodiment 1 of the present invention.

Fig. 2 is an exploded perspective view showing a schematic configuration of a liquid crystal display device including a television receiver.

Fig. 3 is a plan view showing an arrangement configuration of the LED substrate and each holding member in the chassis provided in the liquid crystal display device.

Fig. 4 is a sectional view of the line iv-iv of fig. 3 in the liquid crystal display device.

Fig. 5 is a sectional view of the line v-v of fig. 3 in the liquid crystal display device.

Fig. 6 is a plan view showing a detailed arrangement configuration of the LED substrate and the holding members.

FIG. 7 is a sectional view taken along line vii-vii of FIG. 6.

FIG. 8 is a sectional view taken along line viii-viii of FIG. 6.

Fig. 9 is a cross-sectional view of the line ix-ix of fig. 6.

Fig. 10 is a plan view of the LED substrate.

Fig. 11 is a plan view showing a state (light source unit) in which a substrate reflecting sheet and a diffusion lens are mounted on an LED substrate.

Fig. 12 is a plan view of the substrate holding member.

Fig. 13 is a bottom view of the substrate holding member.

Fig. 14 is a plan view of the sheet holding member.

Fig. 15 is a bottom view of the sheet holding member.

Fig. 16 is a plan view showing a state in which the light source unit is disposed in the chassis and the substrate holding member is mounted.

Fig. 17 is a sectional view of the ix-ix line of fig. 6 showing a state before the substrate holding member and the reflection sheet for chassis are assembled in which the light source unit is arranged in the chassis.

Fig. 18 is a sectional view of vii-vii of fig. 6 showing a state before the chassis reflection sheet is attached, in which the light source unit is disposed in the chassis.

Fig. 19 is a sectional view of the ix-ix line of fig. 6 showing a state before the sheet holding member is mounted in the chassis in which the substrate holding member and the chassis reflection sheet are mounted.

Fig. 20 is a sectional view of line vii-vii in fig. 6, showing a state before the sheet holding member is attached to the chassis in which the chassis reflection sheet is attached to the chassis.

Fig. 21 is a sectional view showing a supporting position of the chassis reflection sheet according to modification 1 of embodiment 1.

Fig. 22 is a sectional view showing a supporting position of the chassis reflection sheet according to modification 2 of embodiment 1.

Fig. 23 is a plan view showing the 1 st support part in the chassis of embodiment 2 of the present invention.

FIG. 24 is a sectional view taken along the line xxiv-xxiv of FIG. 23.

Fig. 25 is a sectional view showing a substrate holding member according to embodiment 3 of the present invention.

Fig. 26 is a sectional view showing a support portion according to embodiment 4 of the present invention.

Fig. 27 is a sectional view showing a backlight device according to embodiment 5 of the present invention.

Detailed Description

< embodiment 1>

Embodiment 1 of the present invention will be described with reference to fig. 1 to 20. In the present embodiment, the liquid crystal display device 10 is illustrated as an example. Further, an X axis, a Y axis, and a Z axis are shown in a part of each drawing, and each axis direction is depicted as the direction shown in each drawing. The upper side shown in fig. 4 and 5 is referred to as the front side, and the lower side is referred to as the back side.

As shown in fig. 1, the television receiving apparatus TV of the present embodiment includes a liquid crystal display device 10, two front and rear cabinets Ca and Cb that house the liquid crystal display device 10 therebetween, a power supply P, a tuner T, and a base S. The liquid crystal display device (display device) 10 is a horizontally long square (rectangular) as a whole, and is housed in a vertically placed state. As shown in fig. 2, the liquid crystal display device 10 includes a liquid crystal panel 11 as a display panel and a backlight device (illumination device) 12 as an external light source, which are integrally held by a frame-shaped outer frame 13 or the like. In the present embodiment, a screen size of 42 inches and a horizontal-vertical ratio of 16: 9 are exemplified.

The liquid crystal panel 11 and the backlight device 12 constituting the liquid crystal display device 10 will be described in order. The liquid crystal panel (display panel) 11 is a rectangular panel in plan view, and is configured by bonding a pair of glass substrates with a predetermined gap therebetween and sealing liquid crystal between the two glass substrates. One glass substrate is provided with a switching element (e.g., TFT) connected to a source wiring and a gate wiring which are orthogonal to each other, a pixel electrode and an alignment film connected to the switching element, and the other glass substrate is provided with a color filter, a counter electrode, an alignment film, and the like in which colored portions such as R (red), G (green), and B (blue) are arranged in a predetermined array. Polarizing plates are disposed outside the two substrates.

Next, the backlight device 12 will be described in detail. As shown in fig. 2, the backlight device 12 includes: a chassis 14 having a substantially box shape having an opening 14b on a light emitting surface side (liquid crystal panel 11 side); a group of optical members 15 (a diffusion plate (light diffusion member) 15a and a plurality of optical sheets 15b arranged between the diffusion plate 15a and the liquid crystal panel 11) arranged so as to cover the opening 14b of the chassis 14; and a frame 16 disposed along the long side of the base 14, and sandwiching the outer edge portion of the group of optical components 15 between the frame 16 and the base 14. As shown in fig. 3 to 5, the base 14 includes: an LED17(Light emitting diode) as a Light source; an LED substrate 18 on which an LED17 is mounted; and a diffusion lens 19 mounted in a position corresponding to the LED17 in the LED substrate 18. Further, the base 14 includes: a substrate holding member 20 capable of holding the LED substrate 18 between the substrate holding member 20 and the chassis 14; a reflection sheet 21 for reflecting light in the chassis 14 toward the optical member 15; and a sheet holding member 24 capable of holding a base reflection sheet 22 described later in the reflection sheet 21. In the backlight device 12, the light exit side is closer to the optical member 15 than the LEDs 17. The respective constituent components of the backlight device 12 will be described in detail below.

As shown in fig. 3 to 5, the base 14 is made of metal, and includes: a bottom plate 14a having a rectangular shape similar to the liquid crystal panel 11; side plates 14c rising from outer ends of respective sides of the bottom plate 14 a; and a support plate 14d extending outward from the rising end of each side plate 14c, and having a shallow substantially box shape (substantially shallow dish shape) opening to the front side as a whole. The base 14 has a long side direction coincident with the X-axis direction (horizontal direction) and a short side direction coincident with the Y-axis direction (vertical direction). The frame 16 and the optical member 15 described later can be placed on each support plate 14d of the base 14 from the front side. Each support plate 14d is fixed to the frame 16 by screws. In the bottom plate 14a of the base 14, a fitting hole 14e for fitting the substrate holding member 20 is provided. The plurality of mounting holes 14e are arranged in the bottom plate 14a in a dispersed manner corresponding to the mounting positions of the substrate holding members 20.

As shown in fig. 2, the optical member 15 is a rectangular (rectangular) member that is horizontally long in a plan view, similarly to the liquid crystal panel 11 and the chassis 14. As shown in fig. 4 and 5, the outer edge portion of the optical member 15 is placed on the support plate 14d, thereby covering the opening portion 14b of the chassis 14 and being disposed so as to be sandwiched between the liquid crystal panel 11 and the LED 17. The optical member 15 includes a diffusion plate 15a disposed on the rear side (the side opposite to the LED17 side and the light exit side) and an optical sheet 15b disposed on the front side (the liquid crystal panel 11 side and the light exit side). The diffuser plate 15a is formed by dispersing a large number of diffusing particles in a substantially transparent resin base material having a predetermined thickness, and has a function of diffusing transmitted light. The optical sheet 15b is a sheet having a smaller thickness than the diffuser plate 15a, and 2 optical sheets 15b are stacked (fig. 7 to 9). Specific types of the optical sheet 15b include, for example, a diffusion sheet, a lens sheet, a reflection-type polarizing plate, and the like, and can be appropriately selected from these.

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

The LED17 and the LED substrate 18 on which the LED17 is mounted will be described below. As shown in fig. 7, 8, and 10, the LED17 has a structure in which an LED chip is sealed with a resin material on a substrate portion fixed to the LED substrate 18. The LED chip mounted on the substrate portion has 1 main emission wavelength, and specifically, a chip emitting blue monochromatic light is used. On the other hand, a fluorescent material for converting blue light emitted from the LED chip into white light is dispersed and mixed in the resin material for sealing the LED chip. This allows the LED17 to emit white light. The LED17 is of a so-called top emission type in which the surface opposite to the mounting surface to the LED board 18 is a light-emitting surface 17 a. The optical axis LA of the LED17 is set to substantially coincide with the Z-axis direction (the direction perpendicular to the main plate surfaces of the liquid crystal panel 11 and the optical member 15). The light emitted from the LED17 is diffused radially to some extent in three dimensions within a predetermined angular range around the optical axis LA, but its directivity is higher than that of a cold cathode tube. That is, the light emission intensity of the LED17 shows an angular distribution that tends to sharply increase in the direction along the optical axis LA and sharply decrease as the angle of inclination with respect to the optical axis LA becomes larger.

As shown in fig. 10, the LED board 18 has a rectangular base material in a plan view, extends along the bottom plate 14a in a state where the longitudinal direction coincides with the X-axis direction and the short-side direction coincides with the Y-axis direction, and is housed in the chassis 14 (fig. 3). The LED board 18 is made of a metal such as an aluminum material similar to the base 14, and has a wiring pattern including a metal film such as a copper foil formed on the surface thereof with an insulating layer interposed therebetween. As a material used as a base material of the LED substrate 18, an insulating material such as ceramic can be used. As shown in fig. 7, 8, and 10, the LED17 having the above-described configuration is surface-mounted on a surface facing the front side (a surface on the side of the opening 14b, and a surface opposite to the bottom plate 14a of the chassis 14) of the board surface of the base material of the LED board 18. The LEDs 17 are arranged in parallel in a straight line along the longitudinal direction (X-axis direction) of the LED board 18 and are connected in series by a wiring pattern formed on the LED board 18. The arrangement pitch of the LEDs 17 is substantially constant, that is, the LEDs 17 are arranged at equal intervals.

On the other hand, connectors (mounting members) 25 are provided at both ends of the LED board 18 in the longitudinal direction. The connector 25 is a mounting member connected to the wiring pattern and serving as a connection function to an external control circuit or a connection function between adjacent LED boards 18, and is not an optical member having an optical function (a light emitting function, a light diffusing function (a light guiding function)) as in the case of the LED17 or the diffusion lens 19. That is, the connector 25 is one of electrical connection components, and can be said to be a non-optical component. The connector 25 is mounted on the mounting surface 18a of the LED board 18 on the same side as the LED 17. Therefore, the LED board 18 can be said to be a so-called single-sided mounting board in which the LED17 and the connector 25 are mounted only on 1 mounting surface 18 a. Such a single-sided mounting board is particularly advantageous in terms of manufacturing cost as compared with a double-sided mounting board. The connector 25 has a height protruding to the front side from the LED 17.

As shown in fig. 3, the LED boards 18 having the above-described configuration are arranged in a plurality in the X-axis direction and the Y-axis direction in the chassis 14, and are arranged in parallel with each other in a state of being aligned in the longitudinal direction and the short-side direction. That is, the LED substrate 18 and the LEDs 17 mounted thereon are arranged in a matrix in the chassis 14, each having the X-axis direction (the longitudinal direction of the chassis 14 and the LED substrate 18) as the row direction and the Y-axis direction (the short-side direction of the chassis 14 and the LED substrate 18) as the column direction. Specifically, the LED boards 18 are arranged 3 in the X axis direction and 9 in the Y axis direction in the base 14, and 27 in total are arranged in parallel. In the present embodiment, two types of LED boards 18 having different long side dimensions and different numbers of LEDs 17 to be mounted are used. Specifically, 6 mounting-type LED boards 18 are used, on which 6 LEDs 17 are mounted and which have a relatively long side; and 5 mounting type LED boards 18 each having 5 LEDs 17 mounted thereon and a relatively short long side, wherein 1 mounting type LED board 18 having 6 mounting types is disposed at each of both end positions in the X-axis direction of the chassis 14, and 1 mounting type LED board 18 having 5 mounting types is disposed at the center position in the same direction. As described above, the LED substrates 18 arranged in 1 row along the X-axis direction are electrically connected to each other by fitting and connecting the adjacent connecting portions 18a to each other, and the connecting portions 18a corresponding to both ends of the base 14 in the X-axis direction are electrically connected to an external control circuit, not shown. Accordingly, the LEDs 17 of the LED boards 18 arranged in the 1 row are connected in series, and the lighting and lighting of the LEDs 17 included in the 1 row can be collectively controlled by 1 control circuit, thereby reducing the cost. Even in the LED boards 18 of different types having different long side sizes and different numbers of LEDs 17 to be mounted, the short side sizes and the arrangement pitches of the LEDs 17 are substantially the same.

In this way, by preparing a plurality of types of LED boards 18 having different long side sizes and different numbers of LEDs 17 to be mounted, and appropriately combining the methods of using different types of LED boards 18, the following effects can be obtained. That is, in the case of manufacturing the liquid crystal display devices 10 having different screen sizes in a plurality of kinds, whether or not to use the LED substrates 18 of various kinds and the number of the LED substrates 18 to be used can be appropriately changed for each screen size, and it is possible to easily cope with this, and compared with the case where a dedicated design LED substrate having a long side size equal to that of the chassis 14 is prepared for each screen size, the number of the LED substrates 18 required can be greatly reduced, and the manufacturing cost can be reduced. Specifically, in addition to the two types of LED substrates 18(5 mounting types and 6 mounting types), 8 mounting types in which 8 LEDs 17 are mounted can be added, and these 3 types of LED substrates 18 can be used in combination as appropriate, whereby the manufacture of each liquid crystal display device 10 having a screen size of, for example, 26 inches, 32 inches, 37 inches, 40 inches, 42 inches, 46 inches, 52 inches, or 65 inches can be easily performed at low cost.

The diffusion lens 19 includes a synthetic resin material (e.g., polycarbonate, acrylic, etc.) that is substantially transparent (has high light transmittance) and has a higher refractive index than air. As shown in fig. 7, 8, and 11, the diffusion lens 19 has a predetermined thickness, is formed in a substantially circular shape in plan view, is mounted on the LED substrate 18, and covers the LEDs 17 independently from the front side, i.e., overlaps the LEDs 17 in plan view. The diffusion lens 19 can diffuse and emit highly directional light emitted from the LED 17. That is, since the directivity of the light emitted from the LED17 is relaxed by the diffusion lens 19, even if the interval between the adjacent LEDs 17 is large, it is difficult to visually recognize the area therebetween as a dark portion. This reduces the number of LEDs 17. The diffusion lens 19 has a height that protrudes to the front side from the connector 25 in a state of being mounted on the LED board 18. The diffusion lens 19 is disposed substantially concentrically with the LED17 in plan view. The diffusion lens 19 is much larger in size in both the X-axis direction and the Y-axis direction than the LED 17. On the other hand, the diffusion lens 19 is smaller in size in the X-axis direction than the LED substrate 18, and is larger in size in the Y-axis direction than the LED substrate 18. Therefore, both ends of the diffusion lens 19 in the Y axis direction protrude outward in the Y axis direction by a predetermined dimension from the LED substrate 18.

In the diffusion lens 19, a surface facing the LED substrate 18 toward the rear side is a light incident surface 19a on which light from the LED17 is incident, and a surface facing the optical member 15 toward the front side is a light emitting surface 19b from which light is emitted. As shown in fig. 7 and 8, the light incident surface 19a is parallel to the entire surface (X-axis direction and Y-axis direction) of the LED board 18, and a light incident side concave portion 19c is formed in a region overlapping with the LED17 in a plan view, thereby having an inclined surface. The light incident side concave portion 19c is substantially conical, is disposed at a substantially concentric position in the diffusion lens 19, and is configured to open to the rear side, i.e., the LED17 side. The diameter of the opening end of the light entrance side concave portion 19c toward the LED17 is the largest and larger than the diameter of the LED17, and the diameter is continuously gradually smaller as it goes from the front side to the front side, and the diameter is the smallest at the front side end. The light incident side concave portion 19c has a substantially inverted V-shaped cross section, and the peripheral surface thereof is an inclined surface inclined with respect to the Z-axis direction. The inclined surface is inclined such that the front end portion thereof intersects the optical axis LA of the LED 17. Therefore, the light emitted from the LED17 and entering the light incident side concave portion 19c enters the diffusion lens 19 through the inclined surface, but at this time, the light is refracted in a direction away from the center by the amount of the inclination angle of the inclined surface with respect to the optical axis LA, that is, is refracted at a wide angle, and enters the diffusion lens 19.

In the light incident surface 19a of the diffusion lens 19, a fitting leg portion 19d is provided at a position radially outward of the light incident side concave portion 19c, and the fitting leg portion 19d projects toward the LED substrate 18 side and is configured to fit the diffusion lens 19 to the LED substrate 18. The 3 mounting leg portions 19d are disposed at positions closer to the outer peripheral end portion than the light incident side concave portion 19c in the diffusion lens 19, and are disposed at positions substantially in the shape of a regular triangle when viewed from above on a line connecting the respective mounting portions. The distal end portion of each mounting leg 19d is fixed to the LED substrate 18 with an adhesive or the like, whereby the diffusion lens 19 can be fixed in a state of being mounted on the LED substrate 18. The diffusion lens 19 is fixed to the LED board 18 by the mounting leg portions 19d, thereby leaving a predetermined gap between the light incident surface 19a and the LED board 18. The gap allows light from a space outside the diffusion lens 19 in a plan view to enter. In the mounted state, the LED17 projects from the LED substrate 18 so that the tip end thereof enters the light entrance recess 19 c.

The light output surface 19b of the diffusion lens 19 is formed in a flat substantially spherical shape. This makes it possible to refract the light emitted from the diffusion lens 19 in a direction away from the center, i.e., in a wide angle, at the interface with the air layer outside. A light-emitting-side concave portion 19e is formed in a region of the light emitting surface 19b that overlaps with the LED17 in a plan view. The light-emitting-side concave portion 19e is formed in a substantially mortar shape, and the peripheral surface thereof is formed in a flat substantially spherical shape having a descending gradient toward the center. In addition, an angle formed by a tangent to the peripheral surface of the light exit-side concave portion 19e with respect to the optical axis LA of the LED17 is relatively larger than an angle formed by an inclined surface of the light entrance-side concave portion 19c with respect to the optical axis LA. The region of the light emitting surface 19b overlapping the LED17 in a plan view is a region where the amount of light from the LED17 is extremely large compared to other regions, and the luminance tends to be locally high, and the light emitting-side concave portion 19e is formed here, whereby light from the LED17 can be refracted and emitted over a wide angle, or part of light from the LED17 can be reflected toward the LED substrate 18. This can suppress local increase in luminance in the region of the light emission surface 19b that overlaps with the LED17, and is suitable for preventing luminance unevenness.

The reflective sheet 21 is explained below. The reflection sheet 21 includes a chassis reflection sheet 22 having a size covering substantially the entire area of the inner surface of the chassis 14 and substrate reflection sheets 23 having sizes covering the LED substrates 18 independently. Both the reflection sheets 22 and 23 are made of synthetic resin, and have a white surface with good light reflectivity. The chassis reflection sheet 22 is arranged on the opposite surface side (the opening 14b side, the side opposite to the LED substrate 18 side) from the substrate reflection sheet 23.

The reflection sheet 22 for a chassis is explained first. As shown in fig. 3, the chassis reflection sheet 22 extends along the inner surface of the chassis 14, and the main body 22a is provided as a majority of the central side extending along the bottom plate 14a of the chassis 14. The main body 22a has a hole 22b formed therethrough through which light emitted from each diffusion lens 19 disposed in the chassis 14 can pass. The plurality of holes 22b are arranged in parallel at positions overlapping the respective diffusion lenses 19 in a plan view of the main body portion 22a, and are arranged in a matrix. As shown in fig. 6, the hole 22b is circular in plan view, and has a diameter larger than the diffusion lens 19. As shown in fig. 3, the chassis reflection sheet 22 covers the region between the adjacent diffusion lenses 19 and the outer peripheral region in the chassis 14, and thus can reflect light directed to each region toward the optical member 15 (toward the opening 14 b). As shown in fig. 7 in particular, the chassis reflection sheet 22 is also arranged at a position overlapping the connector 25 as a non-optical member in a plan view on the LED substrate 18, and covers the connector 25 from the front side over substantially the entire area, thereby preventing the connector 25 from being exposed to the front side (the opening 14b side). Thus, even if the light reflectance of the surface of the connector 25 is different from the light reflectance of the chassis reflection sheet 22, the light reflectance of the entire inside of the chassis 14 is not uneven, and uniformity can be maintained. As shown in fig. 4 and 5, the outer peripheral portion of the chassis reflection sheet 22 stands up so as to cover the side plate 14c and the support plate 14d of the chassis 14, and the portion placed on the support plate 14d is sandwiched between the chassis 14 and the optical member 15. In the chassis reflection sheet 22, a portion connecting the main body portion 22a and the portion placed on the support plate 14d is inclined.

On the other hand, as shown in fig. 11, the substrate reflection sheet 23 extends along the LED substrate 18, and is formed to have substantially the same outer shape as the LED substrate 18, that is, a rectangular shape in a plan view. As shown in fig. 7 and 8, the substrate reflection sheet 23 is disposed so as to overlap the front surface of the LED substrate 18, that is, the mounting surface 18a of the LED17, and is disposed so as to cover substantially the entire region thereof from the front surface. As shown in fig. 7 and 8, the substrate reflection sheet 23 is interposed between the diffusion lens 19 and the LED substrate 18, and faces the light incident surface 19b (surface on the LED17 side) of the diffusion lens 19. Therefore, the substrate reflection sheet 23 is disposed in the hole 22b formed in the chassis reflection sheet 22 disposed on the front side in a plan view, and the light entering the hole 22b can be reflected toward the diffusion lens 19.

As shown in fig. 11, the substrate reflection sheet 23 has a long side dimension substantially equal to that of the LED substrate 18, and a short side dimension larger than that of the LED substrate 18. As shown in fig. 6 and 8, the short side dimension of the substrate reflection sheet 23 is larger than the diameter dimensions of the diffusion lens 19 and the hole 22b of the chassis reflection sheet 22. That is, the substrate reflection sheet 23 is disposed so as to cover substantially the entire region facing the diffusion lens 19, and is disposed so as to cover substantially the entire region within the hole 22b (including the region between the diffusion lens 19 and the hole 22b in a plan view) in a plan view, and overlaps with the edge of the hole 22b in a plan view. Therefore, the light reflected by the diffusion lens 19 and returned to the LED substrate 18 side, or the light directed from the space outside the diffusion lens 19 in the plan view into the hole 22b can be returned again to the diffusion lens 19 side by the substrate reflection sheet 23 with almost no leakage. This improves the efficiency of light utilization, thereby improving the luminance. In other words, sufficient luminance can be obtained even when the number of LEDs 17 provided is reduced to reduce the cost.

Further, in the substrate reflection sheet 23, LED insertion holes 23a through which the LEDs 17 pass are formed so as to penetrate at positions overlapping the LEDs 17 in the LED substrate 18 in a plan view. In the substrate reflection sheet 23, leg insertion holes 23b through which the mounting legs 19d of the diffusion lenses 19 pass are formed so as to penetrate and overlap the mounting legs in a plan view. In the substrate reflection sheet 23, connector insertion holes 23d for allowing the connectors 25 to pass therethrough are formed to penetrate through both ends in the longitudinal direction. As described above, when the substrate reflection sheet 23 overlaps the mounting surface 18a of the LED substrate 18, the LED18, the mounting leg 19d of the diffusion lens 19, and the connector 25 enter the holes 23a, 23b, and 23d, respectively, thereby avoiding mutual interference.

The substrate holding member 20 and the sheet holding member 24 are explained next. First, the arrangement of the holding members 20 and 24 in the base 14 will be described. As shown in fig. 3, a plurality of holding members 20 and 24 are arranged in parallel in the plane of the bottom plate 14a of the base 14. Specifically, the holding members 20 and 24 are arranged in a matrix in the base plate 14a in a plurality of rows in the X-axis direction (the longitudinal direction of the base 14 and the LED substrate 18) and in a plurality of columns in the Y-axis direction (the short-side direction of the base 14 and the LED substrate 18). The holding members 20 and 24 are disposed at positions overlapping with the LED substrates 18 in a plan view and at positions between the adjacent diffusion lenses 19 (LEDs 17). Therefore, the holding members 20 and 24 are arranged in the same manner as the diffusion lens 19 and the LED 17. Since 1 holding member 20, 24 is disposed in each region between adjacent diffusion lenses 19 (LEDs 17) on the LED substrate 18, the diffusion lenses 19 (LEDs 17) and the holding members 20, 24 are arranged substantially alternately in the X-axis direction. Specifically, the holding members 20 and 24 are attached to the LED boards 18 in 4 pieces. Specifically, in the 6 mount-type LED boards 18, the holding members 20 and 24 are arranged at positions other than the center position in the longitudinal direction in the region between the adjacent diffusion lenses 19 (LEDs 17), whereas in the 5 mount-type LED boards 18, the holding members 20 and 24 are arranged in the entire region between the adjacent diffusion lenses 19 (LEDs 17).

As described above, in the respective holding members 20 and 24 arranged in a matrix in the base 14, as shown in fig. 3, a plurality of sheet holding members 24 (specifically, a total of 14) are intermittently arranged in a zigzag manner, and the substrate holding members 20 are arranged at other positions. Specifically, in the center region in the X-axis direction in the base 14 (the region where the 5 mounting-type LED boards 18 are arranged), the 4 piece holding members 24 are arranged at positions near the center in the longitudinal direction of each LED board 18 and at positions that are zigzag when viewed from above. On the other hand, in both end side regions in the X-axis direction in the chassis 14 (regions where 6 mounting-type LED boards 18 are arranged), the 5 sheet holding members 24 are arranged at positions at the ends in the longitudinal direction of the LED boards 18, respectively, and at positions that are zigzag when viewed in plan. As described above, the plurality of sheet holding members 24 are appropriately distributed and arranged in the plane of the bottom plate 14a of the base 14. Further, the substrate holding members 20 are mounted on all the LED substrates 18 in the chassis 14, and the sheet holding members 24 are mounted at positions corresponding to only specific LED substrates 18.

The detailed structure of the substrate holding member 20 will be described first, and the detailed structure of the sheet holding member 24 will be described again later. The substrate holding member 20 is made of a synthetic resin such as polycarbonate, and has a white surface with good light reflectivity. The substrate holding member 20 is substantially circular in plan view as a whole. As shown in fig. 9, the substrate holding member 20 includes: a main body 20a along the bottom plate 14a of the chassis 14 and the plate surface of the LED substrate 18; and a fixing portion 20b protruding from the main body portion 20a toward the back side, i.e., toward the base 14 side, and fixed to the base 14. The substrate holding member 20 has a symmetrical shape as a whole with a central axis along the Z-axis direction as a center of symmetry.

As shown in fig. 12 and 13, the main body portion 20a is substantially circular in plan view, and is formed in a substantially straight plate shape along the X-axis direction and the Y-axis direction. As shown in fig. 6, the diameter dimension is substantially the same as the short side dimension (dimension in the Y-axis direction) of the LED substrate 18. The main body 20a is mounted at a position overlapping the LED substrate 18 in a plan view, and thus the LED substrate 18 can be held between the main body and the bottom plate 14a of the chassis 14. As shown in fig. 9, since the main body portion 20a is mounted in a state in which the substrate reflection sheet 23 is arranged in advance on the front side of the LED substrate 18, the substrate reflection sheet 23 and the LED substrate 18 can be sandwiched together. That is, the substrate holding member 20 of the present embodiment can sandwich (hold) the substrate reflection sheet 23 and the LED substrate 18 in a state of being stacked on each other between them and the chassis 14. In the assembled state, the front surface of the body portion 20a is arranged on the rear side (the LED substrate 18 side) of the diffusion lens 19.

As shown in fig. 6, the main body portion 20a is disposed at a position where the center thereof coincides with the center position in the short side direction of the LED board 18. Therefore, the main body 20a can hold the LED board 18 between the main body 20a and the chassis 14 over the entire length in the short side direction thereof. The diameter of the main body portion 20a is smaller than the interval (arrangement pitch) between the adjacent diffusion lenses 19 (LEDs 17) in the X-axis direction. Thus, the main body portion 20a is disposed in a region between the diffusing lenses 19 (LEDs 17) adjacent to each other in the X-axis direction in the LED board 18, that is, in a non-light-emitting portion of the LED board 18, and does not overlap with the LED17 in a plan view. That is, the main body portion 20a can be prevented from interfering with light emission from the LED 17. In the present embodiment, the distance between the LEDs 17 is made sufficiently large by using the diffusion lens 19 as described above, and therefore the substrate holding member 20 is disposed by utilizing this space, and the LED substrate 18 is fixed by this substrate holding member 20.

As shown in fig. 9, the fixing portion 20b penetrates through a mounting hole 14e formed in the bottom plate 14a of the base 14 corresponding to the mounting position of the substrate holding member 20, and is lockable to the bottom plate 14 a. The following describes the detailed structure of the fixing portion 20 b. As shown in fig. 13, the fixing portion 20b is disposed on the center side of the main body portion 20 a. Specifically, the fixing portion 20b is disposed substantially concentrically with the main body portion 20 a. As shown in fig. 9, the fixing portion 20b protrudes inward from the back surface (surface facing the chassis 14) of the body portion 20a, and has a groove portion 20b3 at the distal end thereof, and an elastic locking piece 20b 2. In other words, the fixing portion 20b includes a base portion 20b1 protruding inward from the body portion 20a and an elastic locking piece 20b2 protruding further inward from the protruding tip of the base portion 20b 1. The base portion 20b1 is substantially cylindrical, and has a diameter smaller than the fitting hole 14e of the base 14 to the extent that it can be inserted into the fitting hole 14 e.

As shown in fig. 13, the groove portion 20b3 is substantially cross-shaped in plan view, and the elastic locking piece 20b2 is divided into 4 pieces. As shown in fig. 9, each elastic locking piece 20b2 is formed in a cantilever shape, and can be narrowed and elastically deformed in the groove portion 20b3 with a base end portion protruding from the base portion 20b1 as a fulcrum. That is, the groove portion 20b3 is a deflection space of each elastic locking piece 20b 2. The elastic locking piece 20b2 is in a form of bulging outward (opposite to the groove portion 20b 3) in the middle, and the bulging portion can be locked from the back side to the edge portion of the fitting hole 14e in the chassis 14. This allows the substrate holding member 20 to be fixed to the chassis 14 in the assembled state. The mounting holes 14e are arranged in a matrix in the X-axis direction and the Y-axis direction in the bottom plate 14a of the base 14 corresponding to the mounting positions of the substrate holding members 20.

As shown in fig. 6, the entire region of the main body portion 20a provided with the fixing portion 20b is arranged to overlap with the LED board 18 in a plan view. Therefore, since the fixing portion 20b is also arranged to overlap the LED substrate 18 in a plan view, the LED substrate 18 is provided with a through hole 18b through which the fixing portion 20b passes. As shown in fig. 10, the through-hole 18b is disposed at a position between the adjacent LEDs 17 (diffusion lenses 19) in the LED substrate 18, that is, at a position not overlapping with the LED17 (diffusion lenses 19) in a plan view. As shown in fig. 9 and 11, a through-hole 23c that communicates with the through-hole 18b of the LED board 18 and through which the fixing portion 20b can pass is formed in the board reflecting sheet 23 sandwiched between the main body portion 20a and the LED board 18 at a position overlapping the through-hole 18b of the LED board 18 in plan view.

In the present embodiment, as described above, the LED18 and the connector 25 are used to mount the single-surface-mount LED substrate 18 on the same mounting surface 18 a. However, when the LED substrate 18 is a single-surface mounting type, the following problems may occur. That is, since the connector 25 is mounted on the mounting surface 18a of the LED board 18 and a step is formed between the connector 25 and the mounting surface 18a, if the chassis reflection sheet 22 is disposed so as to overlap the board reflection sheet 23 overlapping the mounting surface 18a, the chassis reflection sheet 22 is easily deformed by, for example, the connector 25 being placed over the chassis reflection sheet 22. When the chassis reflection sheet 22 is deformed, the reflected light may be uneven, and as a result, the light emitted from the backlight device 12 may be uneven in brightness. In order to avoid such a problem, it is considered to form a hole for passing the connector 25 in the chassis reflection sheet 22, for example. However, since the connector 25 is exposed to the light emitting side through the hole at this time, the uniformity of the light reflectance in the chassis 14 is impaired by locally lowering the light reflectance only in the hole formation region, and there is a possibility that the luminance unevenness or the luminance lowering is caused in the light emitted from the backlight device 12.

Therefore, as shown in fig. 7 to 9, the chassis 14 of the present embodiment is provided with a support portion 26 capable of supporting the chassis reflection sheet 22 at a predetermined position from the back side. That is, the positional relationship of the chassis reflection sheet 22 with respect to the Z-axis direction of the LED substrate 18 and the substrate reflection sheet 23 (the direction orthogonal to the plate surfaces of the LED substrate 18 and the chassis reflection sheet 22) can be regulated by the support portions 26. The support portion 26 is integrally formed on the bottom plate 14a of the base 14, and protrudes from the bottom plate 14a toward the front side. The protruding end surface of the support portion 26 abuts against the rear surface 22c (surface facing the LED board 18 side) of the chassis reflection sheet 22, whereby the rear surface 22c of the chassis reflection sheet 22 is supported at a position separated by a predetermined interval from the mounting surface 18a of the LED board 18 and the front surface 23e of the board reflection sheet 23 superposed thereon toward the front side. Thus, the chassis reflection sheet 22 maintains the flatness of the entire structure, floats from the front surface 23e of the substrate reflection sheet 23 (the mounting surface 18a of the LED substrate 18) and maintains a non-contact state, and has a gap C with the substrate reflection sheet 23 (the LED substrate 18).

Specifically, the support portion 26 is formed by subjecting the bottom plate 14a to, for example, deep drawing, so that the bottom plate 14a partially protrudes to the front side. The support portion 26 protrudes from the bottom plate 14a to a size larger than the sum of the thickness of the LED substrate 18 and the height of the diffusion lens 19. That is, the projecting end surface of the support portion 26 (the support surface for the chassis reflection sheet 22) is disposed at a position projecting to the front side of the diffusion lens 19, which is the most projecting member of the members (the LED17, the diffusion lens 19, the substrate holding member 20, the substrate reflection sheet 23, and the connector 25) disposed on the front side of the mounting surface 18a of the LED substrate 18. Therefore, the chassis reflection sheet 22 is disposed at a position separated by a predetermined gap from the front surface of each member (the LED17, the diffusion lens 19, the substrate holding member 20, the substrate reflection sheet 23, and the connector 25) disposed on the front side of the mounting surface 18a of the LED substrate 18 by the support portion 26, and is kept in a non-contact state. Therefore, the occurrence of local deformation of the chassis reflection sheet 22 across the above-described members is reliably avoided. It is to be noted that all of the above-mentioned members disposed on the front side of the mounting surface 18a of the LED substrate 18 are accommodated in the gap C reserved between the chassis reflection sheet 22 and the substrate reflection sheet 23 without protruding to the front side. Further, since the chassis reflection sheet 22 is arranged on the front side of the diffusion lens 19, the hole 22b formed in the chassis reflection sheet 22 has a sufficient diameter size, and light emitted from the diffusion lens 19 arranged on the rear side of the chassis reflection sheet 22 is hardly blocked and can pass therethrough.

The support portion 26 has a tapered shape in which the diameter size gradually decreases from the protruding base end side to the protruding tip end side, and has a substantially truncated cone shape as a whole. This facilitates the forming of the support portion 26 by the deep drawing. The support portion 26 includes a peripheral wall 26a rising from the bottom plate 14a and a support wall 26b disposed at a rising end of the peripheral wall 26 a. The peripheral wall 26a is substantially cylindrical and inclined with respect to the Z-axis direction. The support wall 26b is substantially flat plate-like and substantially straight along the X-axis direction and the Y-axis direction (the plate surface of the chassis reflection sheet 22), and retains a support surface for the chassis reflection sheet 22.

The plurality of support portions 26 having the above-described configuration are arranged in a dispersed manner in the base 14. Further, two types of support portions 26 are provided in accordance with the installation position in the base 14, and the support portions 26 include: a 1 st support part 26A having only a function of supporting the chassis reflection sheet 22; and a 2 nd support portion 26B having a function of holding the sheet holding member 24 for holding the chassis reflection sheet 22 in an assembled state, in addition to the above-described support function. In the following, when the support portions 26 are distinguished from each other, the reference numeral a is given to the 1 st support portion, the reference numeral B is given to the 2 nd support portion, and when the support portions are not distinguished from each other but are generically called, the reference numerals are not given.

As shown in fig. 3, 6, 8, and 16, the 1 st supporting portion 26A is disposed at a position not overlapping with the LED substrate 18 in a plan view on the bottom plate 14a of the base 14. Specifically, the 1 st supporting part 26A is disposed in a region between the LED substrates 18 adjacent in the Y axis direction in the bottom plate 14a, and a plurality of the supporting parts are intermittently arranged in parallel along the Y axis direction, that is, the outer edge of the long side of the LED substrate 18. More specifically, the 1 st supporting portion 26A is disposed in the bottom plate 14a in the Y-axis direction in a region between the substrate reflection sheets 23 mounted on the LED substrates 18 (a region not overlapping with the substrate reflection sheets 23 in a plan view). A pair of the first supporting portions 26A (except for the LED substrates 18 positioned at both ends in the Y axis direction in the base 14) are arranged at positions sandwiching the LED substrates 18 in the short side direction (X axis direction) of the LED substrates 18 in a plan view. The interval (arrangement pitch) between the 1 st supporting parts 26A adjacent in the X axis direction is substantially the same as the interval between the LEDs 17 (diffusion lenses 19) in the LED substrate 18. The arrangement of the 1 st supporting parts 26A in the X axis direction is substantially the same as that of the LEDs 17. In this way, the 1 st supporting parts 26A are arranged in a matrix in the plane of the bottom plate 14a as in the case of the LEDs 17, and the plurality of 1 st supporting parts 26A are uniformly distributed, so that the main body part 22a of the chassis reflection sheet 22 can be supported without being biased. This can maintain the flatness of the chassis reflection sheet 22 well. Since the 1 st supporting portion 26A does not have the fitting hole 26c as in the 2 nd supporting portion 26B described later, the sheet holding member 24 cannot be fitted. As described above, the 1 st support portion 26A is a substrate non-overlapping support portion disposed at a position not overlapping with the LED substrate 18 in a plan view, and can be said to be a non-porous support portion having no mounting hole 26 c.

As shown in fig. 7 and 9, the 2 nd support portion 26B is disposed at a position overlapping with the LED substrate 18 in a plan view on the bottom plate 14a of the base 14. Specifically, the 2 nd support portion 26B is disposed at a position overlapping with a region (non-light emitting portion) between the adjacent diffusion lenses 19 in the LED substrate 18 in a plan view. Therefore, the LED substrate 18 and the substrate reflection sheet 23 arranged at the installation position of the 2 nd support portion 26B are respectively provided with through holes 18c and 23f for passing the 2 nd support portion 26B. The through holes 18c and 23f are substantially circular in plan view, and have a diameter slightly larger than the outer diameter of the 2 nd support portion 26B. The 2 nd support portion 26B is disposed at the center of each LED board 18 in the short-side direction in the Y-axis direction, that is, at substantially the same position as the LED17 (diffusion lens 19). As described above, the chassis reflection sheet 22 is supported from the back side by the 2 nd support portion 26 in the region overlapping with the LED substrate 18 in a plan view, and is supported by the 1 st support portion 26A arranged in the region not overlapping with the LED substrate 18, and high flatness is maintained.

As shown in fig. 6 and 16, the arrangement of the 2 nd support portion 26B in the bottom plate 14a is the same as that of the sheet holding member 24 described above. That is, a plurality (14 in total) of the 2 nd supporting portions 26B are intermittently arranged in a zigzag shape in the surface of the bottom plate 14 a. Further, a fitting hole 26c for fitting the sheet holding member 24 is formed through the support wall 26B of the 2 nd support portion 26B, and the reflection sheet 22 for a chassis can be sandwiched (held) between the sheet holding member 24 and the fitting hole. As described above, the 2 nd support portion 26B is a substrate overlap support portion disposed at a position overlapping the LED substrate 18 in a plan view, and can be said to be a holed support portion having the mounting hole 26 c.

The structure of the sheet holding member 24 will be described in detail below. The sheet holding member 24 is made of a synthetic resin such as polycarbonate, and has a white surface with good light reflectivity. The sheet holding member 24 is substantially circular in plan view as a whole. As shown in fig. 7, 9, 14, and 15, the sheet holding member 24 includes: a main body portion 24a along the plate surface of the support wall 26B of the 2 nd support portion 26B; a fixing portion 24B protruding from the body portion 24a toward the back side, i.e., toward the 2 nd supporting portion 26B side and fixed to the 2 nd supporting portion 26B; and a diffuser plate support portion 24c that protrudes from the body portion 24a toward the front side, i.e., toward the opening portion 14b side, and can support the diffuser plate 15 a. The detailed configurations of the main body portion 24a and the fixing portion 24b are substantially the same as those of the main body portion 20a and the fixing portion 20b in the substrate holding member 20, and therefore, redundant description is omitted. Similarly to the fixing portion 20B, the fixing portion 24B includes a base portion 24B1, an elastic locking piece 24B2, and a groove portion 24B3, and the elastic locking piece 24B2 is elastically lockable to an edge portion of the fitting hole 26c in the 2 nd supporting portion 26B. Further, the chassis reflection sheet 22 is sandwiched between the main body portion 24a and the 2 nd support portion 26B. The diffuser plate supporting portion 24c is explained below.

The diffuser plate support portion 24c is conical as a whole. Specifically, the diffuser plate support portion 24c has a circular cross-sectional shape cut along the plate surface of the main body portion 24a, and is formed in a tapered shape in which the diameter size gradually decreases from the protrusion base end side toward the protrusion tip end side. The diffusion plate support portion 24c can be brought into contact with the diffusion plate 15a disposed on the innermost side (LED17 side) of the optical member 15, thereby supporting the diffusion plate 15a at a predetermined position. That is, the diffusion plate support portion 24c can restrict the positional relationship between the diffusion plate 15a and the LEDs 17 in the Z-axis direction (the direction orthogonal to the surface of the diffusion plate 15 a) to a fixed state. Since the diffuser plate supporting portion 24c is the only portion protruding from the body portion 24a of the sheet holding member 24 toward the front side, the operator can use the diffuser plate supporting portion 24c as an operating portion when performing the work of attaching the sheet holding member 24 to the chassis 14. This improves the workability of attaching and detaching the sheet holding member 24.

The present embodiment has the above-described configuration, and its operation will be described below. The liquid crystal panel 11 and the backlight device 12 are separately manufactured, and then assembled with each other by using a frame 13 or the like, thereby manufacturing the liquid crystal display device 10 shown in fig. 4 and 5. Here, the assembly operation in manufacturing the backlight device 12 will be described in detail.

In the present embodiment, before the components are assembled to the chassis 14, the LED17, the substrate reflection sheet 23, and the diffusion lens 19 are assembled to the LED substrate 18. Specifically, as shown in fig. 10, first, the LED17 and the connector 25 are mounted at predetermined positions on the mounting surface 18a of the LED board 18, and then the board reflection sheet 23 is covered on the front side. At this time, the LEDs 17 pass through the LED insertion holes 23a of the reflective sheet 23 for substrate, the connectors 25 pass through the connector insertion holes 23d, and the through holes 18b and 23c of the LED substrate 18 and the reflective sheet 23 for substrate are aligned. At this time, the LED substrate 18 and the substrate reflection sheet 23 corresponding to the 2 nd support portion 26B are aligned with each other and communicate with each other through holes 18c and 23 f. Then, as shown in fig. 11, the diffusion lens 19 is mounted on the LED substrate 18 so as to cover each LED 17. At this time, the mounting legs 19d of the diffusion lens 19 are fixed to the LED board 18 with an adhesive through the leg insertion holes 23b of the board reflection sheet 23. As described above, the light source unit U is manufactured by integrating the LED17, the substrate reflection sheet 23, and the diffusion lens 19 with the LED substrate 18.

Next, the operation of assembling the components to the base 14 will be described. The light source units U are accommodated inside the chassis 14 through the opening 14b from the front side thereof, and the light source units U are arranged at predetermined mounting positions with respect to the bottom plate 14 a. At this time, the light source units U are accommodated in positions adjacent to each other in the Y axis direction with respect to the group of the 1 st support portions 26A aligned in the X axis direction in the bottom plate 14 a. Further, the light source unit U corresponding to the 2 nd support portion 26B is inserted into the through holes 18c and 23f along with the storage of the 2 nd support portion 26B. Here, the 2 nd supporting portion 26B can be brought into contact with the edge portions of the through holes 18c and 23f, whereby the light source unit U (the LED substrate 18 and the substrate reflecting sheet 23) can be two-dimensionally positioned with respect to the base 14 in the X-axis direction and the Y-axis direction, as shown in fig. 16 to 18. In addition, the respective through holes 18b, 23c in the respective light source units U are aligned with the fitting holes 14e of the bottom plate 14 a. Here, the LED substrates 18 adjacent to each other in the X-axis direction are electrically connected to each other by fitting the adjacent connectors 25 to each other. The connection work of the connectors 25 of the LED boards 18 arranged in the X-axis direction is not necessarily performed inside the chassis 14, and may be performed outside the chassis 14.

Once the LED substrate 18 is accommodated in the chassis 14 as described above, the operation of mounting the substrate holding member 20 is performed. From the state shown in fig. 17, the substrate holding member 20 is accommodated inside through the opening 14b from the front side of the base 14, and the fixing portion 20b thereof is inserted into each of the holes 14e, 18b, and 23 c. During the insertion of the fixing portion 20b, the elastic locking pieces 20b2 are pressed by the edge portions of the holes 14e, 18b, and 23c, and are temporarily elastically deformed so as to be narrowed in the groove portion 20b 3. When the fixing portion 20b is inserted until the elastic locking pieces 20b2 pass through the fitting hole 14e to reach the depth of the back side of the chassis 14, as shown in fig. 19, the elastic locking pieces 20b2 are elastically restored and the expanded portion thereof is locked to the edge portion of the fitting hole 14e from the back side. This prevents the substrate holding member 20 from falling off the chassis 14 and is fixed in the mounted state. In this state, the LED substrate 18 and the substrate reflection sheet 23 are held together between the main body portion 20a of the substrate holding member 20 and the bottom plate 14a of the chassis 14.

Next, the chassis reflection sheet 22 is disposed in the chassis 14. At this time, the holes 22B in the base reflection sheet 22 are positioned with respect to the diffusion lenses 19 in the light source unit U, the through holes 22d are positioned with respect to the attachment holes 26c of the 2 nd support portions 26B, and the base reflection sheet 22 is laid in the base 14. Here, since the 1 st supporting portion 26A and the 2 nd supporting portion 26B are waiting to be supported in the chassis 14, as shown in fig. 19 and 20, the supporting portions 26A and 26B come into contact with the surface 22c on the back side of the main body portion 22a of the chassis reflection sheet 22 from the back side as they are laid. Thereby, the chassis reflection sheet 22 is supported at a predetermined position in the Z-axis direction in the chassis 14. As shown in fig. 3, since the plurality of supporting portions 26A and 26B are disposed in a dispersed manner over the surface of the bottom plate 14a of the chassis 14, the main body portion 22a of the chassis reflection sheet 22 is supported by the supporting portions 26A and 26B over the entire area without being biased, and hardly deflects or deforms as a whole, and maintains a high flatness. In this laid state, the chassis reflection sheet 22 is supported at a position further away from the front side with respect to the members (the LED17, the diffusion lens 19, the substrate holding member 20, the substrate reflection sheet 23, and the connector 25) arranged on the front side of the mounting surface 18a of the LED substrate 18, and is in a non-contact and non-interference state with the members. If the chassis reflection sheet 22 is disposed so as to overlap the front side of the substrate reflection sheet 23 overlapping the mounting surface 18a of the LED substrate 18, the chassis reflection sheet 22 may straddle the connector 25 in a form protruding from the front surface 23e, and local deformation may occur in the chassis reflection sheet 22. In this regard, according to the present embodiment, the chassis reflection sheet 22 is supported at the above-described position, and therefore, the occurrence of local deformation due to the connector 25 and the like is prevented in advance. At this time, the diffusion lenses 19 are disposed in the holes 22b, and the through holes 22d are aligned with the mounting holes 26 c.

When the chassis reflection sheet 22 is stored in the chassis 14 as described above, the operation of attaching the sheet holding member 24 is continued. At this time, the operator can use the diffusion plate supporting portion 24c of the sheet holding member 24 as an operating portion. The sheet holding member 24 is accommodated from the front side of the chassis 14 through the opening 14b from the state shown in fig. 19 and 20, and the fixing portion 24b is inserted into each of the holes 22d and 26 c. During the insertion of the fixing portion 24b, the elastic locking pieces 24b2 are pressed by the edge portions of the holes 22d and 26c, and are temporarily elastically deformed so as to be narrowed in the groove portion 24b 3. Then, when the fixing portion 24B is inserted until each elastic locking piece 24B2 passes through the fitting hole 26c to reach the depth of the back side of the 2 nd supporting portion 26B, as shown in fig. 7 and 9, each elastic locking piece 24B2 is elastically restored, and its bulging portion is locked to the edge portion of the fitting hole 26c from the back side. This prevents the sheet holding member 24 from coming off the chassis 14, and fixes it in the assembled state. In this state, the main body portion 22a of the chassis reflection sheet 22 is held in a state of being sandwiched between the main body portion 24a of the sheet holding member 24 and the support wall 26B of the 2 nd support portion 26B.

Then, the optical member 15 is attached to the base 14 so as to cover the opening 14 b. The optical member 15 is specifically assembled in the order of the diffusion plate 15a and then the optical sheet 15 b. As shown in fig. 4 and 5, the outer peripheral edge portion of the optical member 15 is supported by the support plate 14d of the chassis 14, and the central side portion is supported by the diffuser plate support portion 24c of each sheet holding member 24. Therefore, when the frame 16 is fitted to the base 14, the outer peripheral edge portion of the optical member 15 is sandwiched between the frame 16 and the support plate 14 d. This completes the manufacture of the backlight device 12. When the manufactured backlight device 12 and the liquid crystal panel 11 are assembled, the liquid crystal panel 11 is placed on the frame 16, and the outer frame 13 is covered on the front side and fixed by screws. Thereby, the liquid crystal panel 11 is sandwiched between the frame 16 and the outer frame 13, and the liquid crystal panel 11 and the backlight device 12 are integrated, thereby completing the manufacture of the liquid crystal display device 10.

When the liquid crystal display device 10 manufactured as described above is used, the LEDs 17 provided in the backlight device 12 are turned on, and an image signal is supplied to the liquid crystal panel 11, whereby a predetermined image is displayed on the display surface of the liquid crystal panel 11. In order to turn on the LEDs 17, power can be supplied by a control circuit, not shown, to collectively drive and control the LEDs 17 on the LED boards 18 adjacent to each other in the X axis direction, which are connected to each other by the connector 25. As shown in fig. 7 and 8, light emitted from each LED17 first enters the light incident surface 19a of the diffusion lens 19. At this time, most of the light enters the inclined surface in the light entrance-side concave portion 19c in the light entrance surface 19a, is refracted at a wide angle according to the inclination angle thereof, and enters the diffusion lens 19. Since the incident light propagates through the diffusion lens 19 and is emitted from the light emitting surface 19b, and the light emitting surface 19b has a flat substantially spherical shape, the light is further refracted at a wide angle at the interface with the external air layer and is emitted. Further, since the light-exit-side concave portion 19e having a substantially mortar shape is formed in the region of the light exit surface 19b where the amount of light from the LED17 is the largest and the peripheral surface thereof has a flat substantially spherical shape, light can be refracted and emitted at a wide angle or reflected toward the LED substrate 18 side on the peripheral surface of the light-exit-side concave portion 19 e. Among these, the light returning to the LED substrate 18 side is reflected by the substrate reflection sheet 23 toward the diffusion lens 19 side, and is incident again on the diffusion lens 19 to be effectively used, so that high luminance can be obtained.

The highly directional light emitted from the LED17 is emitted in a wide-angle spread state by the diffusion lens 19. The light emitted from the diffusion lens 19 includes light directly entering the diffusion plate 15a and light mainly reflected by the chassis reflection sheet 22 and indirectly entering the diffusion plate 15 a. Among them, the uniformity of distribution of light incident on the diffuser plate 15a after being reflected by the chassis reflection sheet 22 depends on the flatness of the chassis reflection sheet 22. For example, if the chassis reflection sheet 22 is locally deformed and the flatness is impaired, the light reflected by the sheet is also uneven, and as a result, the light incident on the diffusion plate 15a is also uneven. In this regard, according to the present embodiment, the chassis reflection sheet 22 is supported by the support portions 26A and 26B disposed so as to be dispersed throughout the chassis 14, thereby avoiding interference with the respective members (the LED17, the diffusion lens 19, the substrate holding member 20, the substrate reflection sheet 23, and the connector 25) disposed on the front side of the mounting surface 18a of the LED substrate 18 and maintaining high flatness. Therefore, unevenness is less likely to occur in the light reflected by the chassis reflection sheet 22, and as a result, unevenness is less likely to occur in the light incident on the diffusion plate 15 a. As described above, since the distribution of light entering the diffuser plate 15a is kept highly uniform, luminance unevenness is less likely to occur in light emitted from the backlight device 12 and the liquid crystal display device 10, and high display quality can be obtained.

As described above, the backlight device 12 of the present embodiment includes: an LED17 as a light source; an LED substrate 18 on which an LED17 is mounted; a connector 25 that is a mounting member mounted on the same one of the mounting surfaces 18a of the LED boards 18 as the LEDs 17; a chassis reflection sheet 22 which is a reflection sheet 21 that is arranged on the LED17 of the LED substrate 18 and on the mounting surface 18a side of the connector 25 and reflects light; and a support portion 26 that supports the chassis reflection sheet 22 at a position separated from the mounting surface 18a of the LED substrate 18.

In this way, the chassis reflection sheet 22 is disposed on the LED17 of the LED substrate 18 and on the mounting surface 18a side of the connector 25, and is supported by the support portion 26 at a position separated from the mounting surface 18 a. The connector 25 is attached to the mounting surface 18a of the LED board 18, and therefore, a step is formed between the connector and the mounting surface 18a, but since the chassis reflection sheet 22 disposed on the mounting surface 18a side is supported by the support portion 26 at a position separated from the mounting surface 18a, the chassis reflection sheet 22 is less likely to be deformed, and unevenness is less likely to occur in light reflected by the chassis reflection sheet 22. Further, since the LED substrate 18 is a so-called single-surface mounting type in which the LED17 and the connector 25 are mounted on the same mounting surface 18a, the manufacturing cost can be reduced.

In addition, in order to prevent the chassis reflection sheet 22 from being deformed, for example, a method of forming a hole for passing the connector 25 in the chassis reflection sheet 22 is conceivable, but when such a method is adopted, the connector 25 is exposed through the hole, and therefore uniformity of light reflectance may be impaired. In this regard, according to the present embodiment, since the chassis reflection sheet 22 is prevented from being deformed without forming a hole in the chassis reflection sheet 22, uniformity of the light reflectance can be maintained. As described above, the present embodiment is less likely to cause unevenness in emitted light.

The supporting portion 26 is formed to support the chassis reflection sheet 22 at a position separated from the surface of the connector 25 opposite to the LED substrate 18 side. Thus, the chassis reflection sheet 22 can be held in a non-contact state with respect to the connector 25 by the support portions 26, and therefore, the chassis reflection sheet 22 can be reliably prevented from being deformed by the connector 25, and the flatness of the chassis reflection sheet 22 can be maintained well.

The LED device further includes a chassis 14, and the chassis 14 has an opening 14b for emitting light from the LED17, and houses the LED substrate 18 and the chassis reflection sheet 22. In this way, light emitted from the LEDs 17 of the LED board 18 housed in the chassis 14 is directly emitted from the opening 14b or indirectly emitted from the chassis reflection sheet 22 by reflection or the like.

The support portion 26 is integrally provided on the base 14. In this way, the chassis reflection sheet 22 can be supported by the support portion 26 integrally provided on the chassis 14. If the support portion is integrally provided on the LED board 18, there is a possibility that the support position of the support portion 26 with respect to the chassis reflection sheet 22 may vary due to an assembly error or the like that may occur between the LED board 18 and the chassis 14, and such variation is difficult to occur according to the present embodiment.

In addition, the support portion 26 is integrally formed with the base 14. In this way, the number of parts and the number of assembly steps can be reduced compared to a case where the support portion is provided separately from the base 14, and therefore, the support portion 26 can be provided at low cost.

The support portion 26 includes a 2 nd support portion 26B, the 2 nd support portion 26B is a substrate overlap support portion disposed at a position overlapping the LED substrate 18 in a plan view, and the LED substrate 18 is provided with a through hole 18c through which the 2 nd support portion 26B passes. In this way, the 2 nd supporting portion 26B is passed through the through hole 18c, whereby the LED board 18 can be positioned in the direction along the board surface.

The support portions 26 include a 1 st support portion 26A, the 1 st support portion 26A being a substrate non-overlapping support portion arranged at a position not overlapping with the LED substrate 18 in a plan view, and at least one pair of the 1 st support portions 26A being arranged at positions sandwiching the LED substrate 18 in a plan view. In this way, the chassis reflection sheet 22 is supported by at least the pair of 1 st support portions 26A disposed so as to sandwich the LED substrate 18, whereby the flatness of the chassis reflection sheet 22 can be further favorably maintained.

The 1 st supporting portions 26A are arranged in parallel along the outer edge of the LED substrate 18. In this way, the flatness of the chassis reflection sheet 22 can be further favorably maintained by the plurality of 1 st supporting portions 26A arranged in parallel along the outer edge of the LED substrate 18.

The reflection sheet 21 includes: a substrate reflection sheet 23 arranged to overlap the mounting surface 18a of the LED substrate 18; and a chassis reflection sheet 22 disposed along the inner surface of the chassis 14 and closer to the opening 14b than the substrate reflection sheet 23, and the support portion 26 is formed to support the chassis reflection sheet 22 at a position separated from a surface 23e of the substrate reflection sheet 23 on the opening 14b side. As described above, as compared with the case where the chassis reflection sheet is disposed so as to overlap the surface 23e of the substrate reflection sheet 23 on the opening 14b side, the chassis reflection sheet 22 is less likely to be deformed due to the step generated between the connector 25 and the substrate reflection sheet 23. Thus, the light reflected by the chassis reflection sheet 22 and emitted from the opening 14b is less likely to be uneven.

Further, the LED device includes a substrate holding member 20, and holds the LED substrate 18 between the substrate holding member 20 and the chassis 14. Thus, the LED substrate 18 with the connector 25 mounted thereon can be held between the substrate holding member 20 and the chassis 14. This can maintain the connector 25 in an appropriate positional relationship with respect to the chassis reflection sheet 22.

Further, the chassis reflection sheet 22 is provided with a hole 22b through which at least light from the LED17 passes, at a position overlapping the LED17 in a plan view. Thus, light emitted from the LED17 can exit through the hole portion 22 b. The chassis reflection sheet 22 disposed on the mounting surface 18a side of the LED17 in the LED board 18 can be prevented from obstructing the emission of light.

Further, a diffusion lens 19 for diffusing and emitting light from the LED17 is attached to the LED substrate 18 at a position overlapping with the LED17 in a plan view, and the hole 22b has a size allowing at least light from the diffusion lens 19 to pass therethrough. In this way, the light from the LED17 can be diffused by the diffusion lens 19 and emitted, and the light can be emitted through the hole 22 b. This is further suitable for preventing luminance unevenness.

The supporting portion 26 is formed to support the chassis reflection sheet 22 at a position separated from the diffusion lens 19 to the side opposite to the mounting surface 18a of the LED substrate 18. Thus, the chassis reflection sheet 22 can be reliably held in a non-contact state with respect to the diffusion lens 19 by the support portions 26, and therefore, the chassis reflection sheet 22 can be reliably prevented from being deformed by the diffusion lens 19, and the flatness of the chassis reflection sheet 22 can be maintained well.

Further, the sheet holding member 24 is provided, and the chassis reflection sheet 22 is held between the sheet holding member 24 and the support portion 26. Thus, the chassis reflection sheet 22 can be held between the sheet holding member 24 and the support portion 26. This can maintain the positional relationship of the chassis reflection sheet 22 with respect to the connector 25 in a more appropriate state.

Further, the support portion 26 includes a 2 nd support portion 26B which is a holed support portion provided with a fitting hole 26c, whereas the sheet holding member 24 includes: a main body 24a that sandwiches the chassis reflection sheet 22 between the main body 24a and the 2 nd support portion 26B; and a fixing portion 24B protruding from the body portion 24a toward the 2 nd support portion 26B side and locked to a hole edge thereof through the fitting hole 26 c. Since the fixing portion 24B passing through the attachment hole 26c of the 2 nd support portion 26B is locked to the hole edge in this way, the sheet holding member 24 can be fixed, and therefore, it is not necessary to use another fixing member such as an adhesive, and fixing can be easily performed at low cost.

In addition, the support portion 26 includes a 1 st support portion 26A as a non-hole support portion having no fitting hole 26c in addition to the 2 nd support portion 26B as a hole support portion. In this way, since the support portion 26 includes the 1 st support portion 26A having no fitting hole 26c, the support portion can support the area of the chassis reflection sheet 22 where the sheet holding member 24 is not fitted. This can further maintain the flatness of the chassis reflection sheet 22.

Further, a plurality of LED boards are arranged, and a connector 25, which is a connecting member for connecting adjacent LED boards 18 to each other, is used as a mounting member. Thus, the chassis reflection sheet 22 can be prevented from being deformed by the connector 25 serving as the connection member.

In addition, the light source is an LED 17. Thus, high brightness, low power consumption, and the like can be achieved.

Embodiment 1 of the present invention has been described above, but the present invention is not limited to the above-described embodiment, and for example, the following modifications can be included. In the following modifications, the same members as those of the above-described embodiment are denoted by the same reference numerals as those of the above-described embodiment, and illustration and description thereof are omitted.

[ modification 1 of embodiment 1]

Modification 1 of embodiment 1 will be described with reference to fig. 21. Here, the supporting position of the supporting portion 26-1 with respect to the chassis reflection sheet 22 is changed.

As shown in fig. 21, the hole 22b of the chassis reflection sheet 22 is formed larger than the diffusion lens 19 in plan view and has a size that allows the diffusion lens 19 to pass therethrough. Further, the dimension of the support portion 26-1 protruding from the bottom plate 14a of the submount 14 is smaller than the sum of the thickness dimension of the LED substrate 18 and the height dimension of the diffusion lens. Therefore, when the chassis reflection sheet 22 is supported by the support portion 26-1, the diffusion lens 19 enters the hole 22 b. Further, the above-mentioned projecting dimension of the support portion 26-1 is a dimension larger than the sum of the thickness dimension of the LED substrate 18 and the height dimension of the connector 25. Therefore, the rear surface 22c of the chassis reflection sheet 22 is held at a position separated from the connector 25 toward the front side in a state where the chassis reflection sheet 22 is supported by the support portion 26-1.

As described above, according to the present modification, the hole 22b is large enough to allow the diffusion lens 19 to pass therethrough, and the support portion 26-1 is formed to support the reflection sheet 22 for a chassis at a position where the diffusion lens 19 is disposed in the hole 22 b. In this way, the gap between the LED substrate 18 and the chassis reflection sheet 22 can be reduced as compared with the case where the chassis reflection sheet 22 is supported at a position separated from the diffusion lens 19 as in embodiment 1. As the distance increases, the optical path length from the reflection of light by the chassis reflection sheet 22 to the exit becomes shorter, and therefore, even if the chassis reflection sheet 22 is slightly deformed, luminance unevenness tends to be liable to occur. In this regard, according to the present modification, since the interval can be made small, the optical path length from the reflection of light by the chassis reflection sheet 22 to the emission can be sufficiently secured, and even if some deformation occurs in the chassis reflection sheet 22, luminance unevenness is less likely to occur.

[ modification 2 of embodiment 1]

Modification 2 of embodiment 1 will be described with reference to fig. 22. Here, the supporting position of the supporting portion 26-2 with respect to the chassis reflection sheet 22 is further changed.

As shown in fig. 22, the dimension of the support portion 26-2 protruding from the bottom plate 14a of the base 14 is substantially the same as the sum of the thickness dimension of the LED board 18 and the height dimension of the connector 25. That is, the support portion 26-2 is flush with the support surface 26d of the chassis reflection sheet 22 and the front surface 25a of the connector 25. Therefore, in a state where the chassis reflection sheet 22 is supported by the support portion 26-2, the rear surface 22c of the chassis reflection sheet 22 and the front surface 25a of the connector 25 are held at positions flush with each other. In this state, the chassis reflection sheet 22 is also supported in a state of maintaining high flatness as in embodiment 1.

As described above, according to the present modification, the supporting portion 26-2 is formed so as to support the chassis reflection sheet 22 at a position flush with the surface 25a of the connector 25 on the side opposite to the LED board 18 side. Thus, the support portion 26-2 can maintain the flatness of the chassis reflection sheet 22, and the gap between the LED substrate 18 and the chassis reflection sheet 22 can be kept to a minimum. Since the optical path length from the reflection of light from the chassis reflection sheet 22 to the exit is shorter as the interval is larger, luminance unevenness tends to occur even if the chassis reflection sheet 22 is slightly deformed. In this regard, according to the present modification, since the above-described interval is a necessary minimum, the optical path length from the reflection of light by the chassis reflection sheet 22 to the exit can be sufficiently secured, and even if some deformation occurs in the chassis reflection sheet 22, luminance unevenness is less likely to occur.

< embodiment 2>

Embodiment 2 of the present invention will be described with reference to fig. 23 or 24. In embodiment 2, a configuration in which the 1 st supporting portion 126A is modified is shown. Note that the same configurations, operations, and effects as those of embodiment 1 are not described repeatedly.

As shown in fig. 23, the 1 st support portion 126A is disposed at a position adjacent to the LED board 18 in the Y-axis direction and extends along the X-axis direction, that is, along the edge portion of the long side of the LED board 18. The 1 st support part 126A is substantially rectangular in plan view like the LED substrate 18, and as shown in fig. 24, includes: a peripheral wall 126a rising from the bottom plate 14 a; and a support wall 126b connected to the rising end of the peripheral wall 126 a. The peripheral wall 126a is formed by connecting a pair of short-side wall portions disposed at both ends in the X-axis direction and a pair of long-side wall portions disposed at both ends in the Y-axis direction. The support wall 126b is a rectangular flat plate elongated in the X-axis direction and has a size smaller than the LED substrate 18 by one turn. The support wall 126b can be in surface contact with the back surface 22c of the chassis reflection sheet 22 over the entire area thereof. That is, the region of the chassis reflection sheet 22 adjacent to the LED substrate 18 in the Y axis direction in a plan view is supported by the 1 st support portion 126A in a surface contact state. This can maintain the flatness of the chassis reflection sheet 22 higher.

As described above, according to the present embodiment, the 1 st supporting portion 126A as the substrate non-overlapping supporting portion is in a form extending along the outer edge of the LED substrate 18. In this way, the flatness of the chassis reflection sheet 22 can be further favorably maintained by the 1 st supporting portion 126A extending along the outer edge of the LED substrate 18.

< embodiment 3>

Embodiment 3 of the present invention will be described with reference to fig. 25. In embodiment 3, a configuration of the substrate holding member 220 is modified. Note that the same configurations, operations, and effects as those of embodiment 1 are not described repeatedly.

As shown in fig. 25, a support portion 27 is provided in the main body portion 220a of the substrate holding member 220, and the support portion 27 protrudes to the front side and supports the chassis reflection sheet 22. The support portion 27 is integrally formed with the substrate holding member 220. The support portion 27 has a generally conical shape with a spherical tip as a whole, similarly to the diffuser plate support portion 24c in the sheet holding member 24. The support portion 27 is formed to have a protruding dimension such that the protruding tip portion thereof is at substantially the same position as the other support portions 26 in the Z-axis direction. The supporting portion 27 abuts on the rear surface 22c of the chassis reflection sheet 22, and thereby the chassis reflection sheet 22 can be supported at a predetermined position in the Z-axis direction in cooperation with the other supporting portion 26. Since the plurality of substrate holding members 220 are arranged in a matrix within the surface of the bottom plate 14a of the chassis 14 (see fig. 3), the supporting portions 27 are provided in the substrate holding members 220, whereby the chassis reflection sheet 22 can be supported more stably, and higher flatness can be ensured. Further, since the operator can use the support portion 27 as an operation portion when performing the work of mounting the substrate holding member 220 on the base 14, the workability of mounting the substrate holding member 220 can be improved.

As described above, according to the present embodiment, the support portion 27 is integrally provided to the substrate holding member 220. In this way, the chassis reflection sheet 22 can be supported by the support portion 27 integrally provided to the substrate holding member 220.

< embodiment 4>

Embodiment 4 of the present invention will be described with reference to fig. 26. In embodiment 4, the support portion 28 is shown as a separate member from the base 14. Note that the same configurations, operations, and effects as those of embodiment 1 are not described repeatedly.

As shown in fig. 26, the support portion 28 is a member separate from the base 14, and is integrally fixed to the bottom plate 14a of the base 14 by a fixing member such as an adhesive. The supporting portion 28 is a bottomed rectangular cylinder as a whole, and the bottom portion thereof is a supporting wall 28a that supports the reflection sheet 22 for a chassis. In this way, the material used for the support portion 28, the shape of the support portion 28, and the like can be freely selected by making the support portion 28a separate member from the base 14.

< embodiment 5>

Embodiment 5 of the present invention will be described with reference to fig. 27. In embodiment 5, a mode in which the diffusion lens 19 is omitted is shown. Note that the same configurations, operations, and effects as those of embodiment 1 are not described repeatedly.

In the present embodiment, the diffusion lens 19 shown in embodiment 1 is omitted, and therefore, as shown in fig. 27, the light emitted from each LED17 directly reaches the optical member 15. The holes 422b in the chassis reflection sheet 422 are disposed at positions overlapping the LEDs 17 in plan view and allow light emitted from the LEDs 17 to pass therethrough. The diameter of each hole 422b is set to a size enough to hardly block light emitted from each LED17, considering that the chassis reflection sheet 422 is arranged on the front side of each LED 17. Since the chassis reflection sheet 422 is supported by the support 26 at a position separated from the LED17 and the connector 25 toward the front side, the LED17 does not enter the hole 422 b. According to the present embodiment, since the diffusion lens 19 is omitted, the hole 422b formed in the chassis reflection sheet 422 can be reduced in size. In the embodiment in which the diffusion lens 19 is omitted as in the present embodiment, the substrate reflection sheet 23 may be omitted.

< other embodiment >

The present invention is not limited to the embodiments described above and illustrated in the drawings, and for example, the following embodiments are also included in the technical scope of the present invention.

(1) In addition to the above embodiments, the specific shape of each support portion can be appropriately changed. For example, the support portion may be truncated pyramid-shaped, or a bottomed cylinder-shaped.

(2) In addition to the above embodiments, the arrangement and the number of the supporting portions in the chassis can be changed as appropriate. In particular, the ratio of the number of the 1 st supporting part and the 2 nd supporting part can be appropriately changed together with the absolute value and arrangement of the number of the supporting parts.

(3) In the above embodiments, two types of the 1 st support part and the 2 nd support part are provided as the support part, but the invention also includes a case where only one of the 1 st support part and the 2 nd support part is provided as the support part.

(4) In the above embodiments, although the 2 nd support portion (substrate overlapping support portion) disposed at a position overlapping with the LED substrate in a plan view has a fitting hole and the sheet holding member can be fitted, the invention also includes a case where the 1 st support portion (substrate non-overlapping support portion) disposed at a position not overlapping with the LED substrate in a plan view has a fitting hole and the sheet holding member can be fitted. In this case, the fitting hole of the 2 nd support portion may be omitted, and the sheet holding member may be fitted to only the 1 st support portion.

(5) In each of the above embodiments, the fitting hole for fitting the sheet holding member is provided in the 2 nd supporting portion, but if the fitting hole is not necessary by changing the fitting method of the sheet holding member, the fitting hole can be omitted. As a specific method of assembling the sheet holding member, for example, a method of omitting the elastic locking piece from the sheet holding member and fixing the base of the through hole penetrating the chassis reflection sheet to the No. 2 support portion with an adhesive is also conceivable. In this case, a method such as welding or soldering may be used in addition to the adhesive.

(6) Similarly to the above (5), the method of mounting the substrate holding member on the chassis may be changed, and the mounting hole may be omitted from the chassis in accordance with the change.

(7) In the above embodiments, the connectors of the LED substrates adjacent to each other in the X axis direction are directly fitted and connected to each other, and for example, the connectors attached to the LED substrates are connected to each other by wires, or the LED substrates are directly connected to each other by wires without connectors, is also included in the present invention. In this case, since the wire is a mounting member for the LED substrate, the supporting position of the supporting portion for the chassis reflection sheet is preferably a position at which the chassis reflection sheet is separated from the wire, and may be a position flush with the wire.

(8) In addition to the above embodiments, the supporting position of the supporting portion with respect to the reflection sheet for chassis can be changed as appropriate. For example, the present invention also includes a configuration in which the reflection sheet for a chassis is supported at the following positions: the rear surface of the chassis reflection sheet is arranged closer to the mounting surface of the LED substrate than the front surface of the connector. In embodiment 5, a configuration in which the chassis reflection sheet is supported at a position where the LED enters the hole of the chassis reflection sheet is also included in the present invention.

(9) In embodiment 2 described above, although the 1 st support part 1 having the lateral length is provided at a position adjacent to the LED substrate in the Y axis direction, for example, a configuration in which the long side dimension of the 1 st support part having the lateral length is shortened and a plurality of 1 st support parts are arranged for 1 LED substrate is included in the present invention. On the contrary, the invention also includes the scheme that the 1 st supporting part is formed in the range of covering a plurality of LED substrates in the X-axis direction.

(10) The specific shape and arrangement of the support portion of the substrate holding member shown in embodiment 3 can be changed as appropriate. In addition, the substrate holding member described in embodiment 1 and the substrate holding member described in embodiment 3 can be used at the same time.

(11) In the above embodiments, the reflecting sheet for a substrate is disposed so as to overlap the mounting surface of the LED substrate, but the reflecting sheet for a substrate may be omitted. In this case, it is preferable to form a light reflecting layer of white color, silver color, or the like having good light reflectivity on the mounting surface of the LED substrate.

(12) In the above embodiments, the connector (the wire in (7) above) is exemplified as the mounting member in the LED substrate, but a configuration including a mounting member other than the connector is also included in the present invention. For example, an LED substrate provided with a non-optical component such as a resistor, a capacitor, or a transformer as a mounting component is preferably used. Since the light reflectance of the surface of such a non-optical member is often lower than that of the chassis reflection sheet, it is hesitant to provide a hole for passing the non-optical member in the chassis reflection sheet. Under such circumstances, the present invention can exhibit a favorable effect when an LED substrate including a non-optical component as a mounting component is used.

(13) In the above embodiments, the supporting portion is integrally provided on the base or the supporting portion is integrally provided on the substrate holding member, but the supporting portion may be integrally provided on the LED substrate.

(14) In the above embodiments, the plurality of LED substrates are arranged in parallel in the X-axis direction and connected to each other by the connector, but the present invention can be applied to a case where only 1 LED substrate is arranged in the X-axis direction.

(15) In the above embodiments, the sheet holding member has been shown to have the diffuser plate supporting portion, but the diffuser plate supporting portion may be omitted from the sheet holding member. On the other hand, the diffuser plate supporting portion may be provided on the substrate holding member, and in this case, the chassis reflection sheet may be provided with a hole through which the diffuser plate supporting portion passes.

(16) In the above embodiments, the sheet holding member for holding the reflection sheet for a chassis and the substrate holding member for holding the LED substrate are separately provided, but a so-called hybrid type holding member having a function of holding the LED substrate and the reflection sheet for a chassis, respectively, may be provided.

(17) In the above embodiments, the insertion-type fixing portion is used as the fitting structure of each holding member to the base, but a slide type fitting structure may be used. The sliding type mounting structure is configured such that the fixing portion is in a hook shape, and after the main body portion is pushed into the bottom plate (the 2 nd support portion) of the base, the main body portion is slid along the bottom plate, whereby the hook portion of the fixing portion is locked to the edge portion of the mounting hole.

(18) In the above embodiments, the base is made of metal, but the present invention also includes a base made of other material such as synthetic resin.

(19) In the above embodiments, the surface of each holding member is white, but the surface of each holding member may be, for example, milky white or silver. Further, the color of the surface of the holding member can be set by applying paint of a desired color to the surface.

(20) In the above embodiments, the case where 5 mounting types, 6 mounting types, and 8 mounting types are combined as appropriate as the LED substrate has been described, but the case where an LED substrate on which LEDs of a number other than 5, 6, and 8 are mounted is used is also included in the present invention.

(21) In the above embodiments, the case of using the type of LED which incorporates an LED chip emitting blue monochromatic light and emits white light by a phosphor is described, but the present invention also includes the case of using the type of LED which incorporates an LED chip emitting ultraviolet monochromatic light and emits white light by a phosphor.

(22) In the above embodiments, the case of using the type of LED in which the LED chip emitting blue monochromatic light is incorporated and the phosphor emits white light is shown, but the present invention also includes the type of LED in which 3 types of LED chips emitting R, G, B monochromatic light are incorporated. In addition, the present invention also includes a configuration in which LEDs of a type in which 3 kinds of LED chips emitting monochromatic light of C (cyan), M (magenta), and Y (yellow) are built in, respectively, are used.

(23) In the above embodiments, the LED emitting white light is used, but the LED emitting red light, the LED emitting blue light, and the LED emitting green light may be used in combination as appropriate.

(24) In the above embodiments, the LED is exemplified as the light source, but the invention also encompasses the use of a point-like light source other than the LED.

(25) In embodiments 1 to 4, a diffusion lens for diffusing light from the LED is used, but an optical lens other than the diffusion lens (for example, a condensing lens having a condensing action) is also included in the present invention.

(26) In addition to the above embodiments, the screen size, the aspect ratio, and the like of the liquid crystal display device can be appropriately changed.

(27) In the above embodiments, the liquid crystal panel and the chassis are illustrated in the vertical state in which the short side direction thereof coincides with the vertical direction, but the liquid crystal panel and the chassis are also included in the present invention in the vertical state in which the long side direction thereof coincides with the vertical direction.

(28) In the above embodiments, the TFT is used as the switching element of the liquid crystal display device, but the present invention is also applicable to a liquid crystal display device using a switching element other than the TFT (for example, a Thin Film Diode (TFD)), and is also applicable to a liquid crystal display device that performs black and white display in addition to a liquid crystal display device that performs color display.

(29) In the above embodiments, the liquid crystal display device using the liquid crystal panel as the display panel is exemplified, but the present invention can be applied to display devices using other types of display panels.

(30) In the above embodiments, the television receiving apparatus having the tuner is exemplified, but the present invention can also be applied to a display apparatus not having the tuner.

Description of the reference numerals

10: liquid crystal display device (display device), 11: liquid crystal panel (display panel), 12: backlight device (illumination device), 14: base, 14 b: opening, 14 e: fitting hole, 17: LED (light source), 18: LED substrate (light source substrate), 18 a: mounting surface, 18 c: through-hole, 19: diffusion lens, 20, 220: substrate holding member, 22, 422: reflection sheet for chassis (reflection member for chassis), 22b, 422 b: hole portion, 22 c: face (face on the light source substrate side), 23: substrate reflection sheet (substrate reflection member), 23 a: LED insertion hole (light source insertion hole), 23 e: surface (opening-side surface), 24: sheet holding member (holding member), 24 a: body portion, 24 b: fixing portion, 25: connector (mounting member, connecting member), 25 a: surface (surface on the side opposite to the light source substrate side), 26, 27, 28: support portion, 26 c: fitting hole, 26A, 126A: no. 1 support (non-porous support, substrate non-overlapping support), 26B: support 2 (perforated support, substrate overlay support)

Claims (25)

1. An illumination device is provided with:

a light source;

a light source substrate on which the light source is mounted;

a mounting member mounted on a mounting surface of the light source substrate on the same side as the light source;

a reflecting member that is disposed on a mounting surface side of the light source and the mounting component in the light source substrate and reflects light; and

and a support portion that supports the reflection member at a position separated from the mounting surface of the light source substrate.

2. The lighting device as set forth in claim 1,

the support portion is formed to support the reflecting member at a position separated from a surface of the mounting member on a side opposite to the light source substrate side.

3. The lighting device as set forth in claim 1,

the support portion is formed to support the reflecting member at a position flush with a surface of the mounting member on a side opposite to the light source substrate.

4. The lighting device according to any one of claims 1 to 3,

the light source device includes a base having an opening for emitting light from the light source, and housing the light source substrate and the reflecting member.

5. The lighting device as set forth in claim 4,

the support part is integrally provided on the base.

6. The lighting device as set forth in claim 5,

the support portion is integrally formed with the base.

7. The lighting device according to claim 5 or claim 6,

the support part includes a substrate overlapping support part arranged at a position overlapping with the light source substrate when viewed from above,

the light source substrate is provided with a through hole for allowing the substrate-overlapping support portion to pass through.

8. The lighting device according to any one of claims 5 to 7,

the support portion includes a substrate non-overlapping support portion disposed at a position not overlapping with the light source substrate in a plan view,

at least one pair of the substrate non-overlapping support portions are arranged at positions sandwiching the light source substrate in a plan view.

9. The lighting device as set forth in claim 8,

the plurality of substrate non-overlapping support portions are arranged in parallel along an outer edge of the light source substrate.

10. The lighting device as set forth in claim 8,

the substrate non-overlapping support part extends along the outer edge of the light source substrate.

11. The lighting device according to any one of claims 4 to 10,

the above-mentioned reflecting member includes: a substrate reflection member arranged to overlap the mounting surface of the light source substrate; and a base reflection member disposed along an inner surface of the base and closer to the opening than the substrate reflection member, wherein the support portion is formed to support the base reflection member at a position separated from a surface of the substrate reflection member closer to the opening.

12. The lighting device according to any one of claims 4 to 11,

the light source device includes a substrate holding member for holding the light source substrate by being sandwiched between the substrate holding member and the base.

13. The lighting device as set forth in claim 12,

the support portion is integrally provided to the substrate holding member.

14. The lighting device according to any one of claims 1 to 13,

a hole portion for passing at least light from the light source is provided in a position of the reflecting member overlapping the light source in a plan view.

15. The lighting device as set forth in claim 14,

a diffusion lens for diffusing and emitting light from the light source is mounted at a position overlapping the light source in a plan view on the light source substrate, and the hole has a size at least allowing the light from the diffusion lens to pass therethrough.

16. The lighting device as set forth in claim 15,

the support portion is formed to support the reflection member at a position separated from the diffusion lens to a side opposite to the mounting surface of the light source substrate.

17. The lighting device as set forth in claim 15,

the hole is sized to allow the diffusion lens to pass therethrough, and the support portion is formed to support the reflection member at a position where the diffusion lens is disposed in the hole.

18. The lighting device according to any one of claims 1 to 17,

the reflection member is held between the holding member and the support portion.

19. The lighting device as set forth in claim 18,

the support part includes a hole support part provided with a fitting hole,

and the holding member includes: a main body portion that sandwiches the reflecting member between the main body portion and the perforated support portion; and a fixing portion protruding from the main body portion toward the hole support portion and locked to a hole edge of the fitting hole through the fitting hole.

20. The lighting device as defined in claim 19,

the support portion includes a non-hole support portion having no fitting hole in addition to the hole-formed support portion.

21. The lighting device according to any one of claims 1 to 20,

the mounting member includes a connecting member for connecting the adjacent light source substrates to each other.

22. The lighting device of any one of claims 1 to 21,

the light source is an LED.

23. A display device is provided with:

the lighting device of any one of claim 1 to claim 22; and a display panel for displaying by using the light from the illumination device.

24. The display device according to claim 23, wherein,

the display panel is a liquid crystal panel in which liquid crystal is sealed between a pair of substrates.

25. A television receiver includes:

a display device as claimed in claim 23 or claim 24.