WO2012137765A1

WO2012137765A1 - Illumination device, display device, and television receiver device

Info

Publication number: WO2012137765A1
Application number: PCT/JP2012/059051
Authority: WO
Inventors: 真之助野澤
Original assignee: シャープ株式会社
Priority date: 2011-04-06
Filing date: 2012-04-03
Publication date: 2012-10-11

Abstract

This backlight device (12) comprises: a plurality of LEDs (light sources) (17); a reflective sheet (movable light-emission regulating part) (21) that is formed in the shape of a sheet extending over a region spanning the plurality of LEDs (17) and that has insertion holes (light source insertion holes) (21d) through which the respective LEDs (17) are passed, the reflective sheet (21) being capable of regulating the range of light emission from each LED (17) by relatively changing the position of at least the edge of each insertion hole (21d) with respect to the LED (17); and ventilation fans (ventilating parts) (22) that can change the relative positional relationship between the reflective sheet (21) and the LEDs (17) by sending air to the reflective sheet (21), and that can include LEDs with different ranges of light emission in said plurality of LEDs (17).

Description

Lighting device, display device, and television receiver

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

For example, since a liquid crystal panel used for a liquid crystal display device such as a liquid crystal television does not emit light, a backlight device is required as an external light source for supplying illumination light to the liquid crystal panel. With respect to this backlight device, with the recent increase in size of liquid crystal display devices, there has been a demand for lower power consumption and improved luminance. In order to satisfy such demands, backlight devices using LEDs as light sources have attracted attention. Yes.

By the way, when the LED is used for a long time in a high temperature environment, there is a possibility that the brightness and the product life are remarkably deteriorated. Accordingly, a cooling structure for cooling the LED has been proposed, and an example thereof is described in Patent Document 1 below.

JP 2008-251245 A

(Problems to be solved by the invention)
On the other hand, a predetermined image is displayed on the liquid crystal panel by driving an active element such as a TFT provided in the liquid crystal panel and shuttering light from the backlight device. At this time, when a bright part and a dark part are mixed in an image to be displayed, the contrast performance may be deteriorated if a sufficient difference in brightness between the bright part and the dark part cannot be secured. In order to improve the contrast performance, for example, among the plurality of LEDs provided in the backlight device, the LED that supplies light to the bright part of the image and the LED that supplies light to the dark part are compared with the former emission amount. It is conceivable to perform so-called local dimming control for controlling the latter light emission amount. However, there is still room for improvement in contrast performance, for example, there is a possibility that light from the LED that supplies light to the bright part may leak to the dark part side.

The present invention has been completed based on the above-described circumstances, and an object thereof is to appropriately adjust the brightness of an irradiation area by emitted light.

(Means for solving problems)
The illuminating device of the present invention has a plurality of light sources, a light source insertion hole that passes through the light source and forms a sheet extending to a region extending over the plurality of light sources, and at least a hole edge of the light source insertion hole is formed in the light source. A movable light output restricting portion capable of restricting a light output range of the light source by being relatively displaced, and a relative position of the movable light output restricting portion relative to the light source by blowing air to the movable light output restricting portion. A blower unit that can change the positional relationship and include a plurality of light sources having different light output ranges.

In this way, when a plurality of light sources are turned on, the light emitted from each light source is emitted as the emitted light of the illumination device. Here, in the irradiation area by the emitted light of the illuminating device, the required brightness may vary from part to part. In that case, the relative positional relationship of the movable light output restricting portion with respect to the light source is changed by blowing air from the air blowing portion with respect to the movable light output restricting portion having a sheet shape extending in a region extending over a plurality of light sources. As a result, at least the edge of the light source insertion hole in the movable light output restricting portion can be displaced relative to the light source, and a plurality of light sources having different light output ranges can be included. Therefore, the brightness of the irradiation area can be made appropriate in each part.

As an embodiment of the lighting device of the present invention, the following configuration is preferable.
(1) The air blowing unit can dissipate heat from the light source by blowing air around the light source or the light source. If it does in this way, it will be possible to dissipate the heat from a light source and to cool a light source by ventilating around a light source or a light source by a ventilation part, and it can prevent that the luminous efficiency of a light source falls. Effects such as can be obtained. In addition, since the air blowing unit has both a function of changing the relative positional relationship of the movable light output regulating unit with respect to the light source and a cooling function of cooling the light source, a dedicated structure is provided for each function. Compared with the case where it is provided separately, the structure can be simplified, which is useful in reducing the cost. Here, “around the light source” refers to air or a structure existing near the light source.

(2) The light source and the movable light output restricting portion are housed inside, and the chassis to which the air blowing portion is attached is provided outside, and the chassis opens toward the movable light output restricting portion. At the same time, a chassis vent hole through which the air from the air blowing section is passed is formed. In this way, the relative positional relationship of the movable light output restricting portion with respect to the light source by supplying air from the air blowing portion attached outside the chassis to the movable light output restricting portion in the chassis through the chassis vent. Thus, the light emission range of the light source can be regulated.

(3) A plurality of the light sources are mounted and a light source board accommodated in the chassis is provided. The light source board opens toward the movable light output restricting portion and communicates with the chassis ventilation hole. Substrate vent holes are formed. In this way, the air blown from the blower attached outside the chassis is supplied toward the movable light output restricting part in the chassis through the chassis vent and the board vent, so that the movable light restricting part relative to the light source is relative to the light source. Therefore, the light emission range of the light source can be regulated.

(4) The chassis vent hole and the board vent hole are arranged at positions that open toward the edge of the light source insertion hole in the movable light output restricting portion. In this way, the air blown from the blower is directly supplied to the hole edge of the light source insertion hole in the movable light output restricting part through the chassis vent and the board vent. Can be regulated.

(5) The movable light output restricting portion is a reflecting member that reflects light from the light source. If it does in this way, the light emission range of a light source can be controlled using the reflective member which reflects the light from a light source. Therefore, as compared with the case where the reflecting member and the movable light output restricting portion are separately provided, the structure can be simplified, which is useful for cost reduction.

(6) The air blower is composed of a blower fan that can rotate in either forward or reverse direction. If it does in this way, the relative positional relationship of the movable light-emission control part with respect to a light source can be freely changed by rotating a ventilation fan to a normal direction or a reverse direction. As a result, it is possible to easily control the light emission range of the light source and to release the restriction state, and thereby to make the brightness of the irradiation area by the emitted light more appropriate in each part. it can.

(7) The plurality of air blowing units are arranged at positions corresponding to the arrangement of the plurality of light sources, and the light source driving unit that drives the plurality of light sources and the air blowing unit that is associated with the light sources are driven. A blower drive unit. If it does in this way, since a plurality of ventilation parts are arranged at a position corresponding to arrangement of a plurality of light sources, while driving a plurality of light sources by a light source drive part, it was matched with a light source by a ventilation drive part. By driving the blower, the light emission range of the light source can be more appropriately regulated.

(8) The light source driving unit drives the plurality of light sources so that a relatively bright light source and a relatively dark light source are included, whereas the blower driving unit includes the movable light output regulating unit. The blowing unit is driven so as to restrict a light output range of the relatively bright light source adjacent to at least the relatively dark light source. In this way, the light source driving unit drives the plurality of light sources to include a relatively bright light source and a relatively dark light source, so that the brightness of the irradiation area by the emitted light of the illumination device is partially set. Accordingly, it is possible to control more appropriately. In addition, since the light emission range of the relatively bright light source adjacent to at least the relatively dark light source is regulated by the movable light emission regulating unit by driving the blower unit by the blower driving unit, In the irradiation area by the emitted light, it is possible to effectively prevent the light on the bright side from leaking to the dark side, and thus the brightness of the irradiation area can be more appropriately controlled according to the part.

(9) The light source driving unit drives the plurality of light sources to include a plurality of relatively bright light sources and a plurality of relatively dark light sources. In addition to the relatively bright light source adjacent to the relatively dark light source, the air blowing unit is driven to restrict the light output range for the plurality of relatively dark light sources. In this way, the light emission range is regulated for a plurality of relatively dark light sources in addition to the relatively bright light source adjacent to the relatively dark light source by driving the air blowing unit by the air blowing drive unit. Therefore, compared with the case where the light emission range is selectively restricted only for a relatively bright light source adjacent to a relatively dark light source, the light emission range of the light source can be easily restricted by the movable light emission restriction unit. Can do. Moreover, compared with the case where the light emission range is regulated for a plurality of relatively bright light sources, it is possible to suppress a decrease in luminance that may occur in the emitted light.

(10) The air blowing drive unit drives the plurality of air blowing units in association with a plurality of light source groups each including the light sources. In this way, it is possible to reduce the number of air blowing units installed and to reduce costs as compared with a case where the same number of air blowing units are installed as light sources and individually associated and driven. Become.

Next, in order to solve the above problems, a display device of the present invention includes the above-described illumination device and a display panel that displays an image using light from the illumination device.

According to such a display device, the illumination device that supplies light to the display panel can appropriately adjust the brightness and darkness of the emitted light, so that the contrast performance can be improved and display with excellent display quality can be achieved. Can be realized.

As an embodiment of the display device of the present invention, an image signal processing unit that processes a signal related to the image, a display panel control unit that controls driving of the display panel based on an output signal from the image signal processing unit, A light source driving unit that drives a plurality of the light sources based on output signals from the image signal processing unit, and a fan that drives the air blowing unit associated with the light sources based on output signals from the image signal processing unit. It is preferable to have a configuration including a drive unit. In this way, by driving the light source by the light source driving unit based on the output signal from the image signal processing unit, for example, while the light source corresponding to the area other than the black display area is turned on in the displayed image, the black display The light source corresponding to the area can be turned off. Thereby, the contrast performance of a display image can be improved. Then, on the basis of the output signal from the image signal processing unit, the air blowing unit associated with the light source that has been turned off by the air blowing drive unit is driven, while the air blowing unit associated with the light source that has been turned on is driven. By not driving, it is possible to reduce power consumption and to appropriately improve the contrast performance by appropriately regulating the light emission range for a light source that requires regulation of the light emission range.

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

(The invention's effect)
According to the present invention, it is possible to appropriately adjust the brightness of the irradiation area by the emitted light.

1 is an exploded perspective view showing a schematic configuration of a television receiver according to Embodiment 1 of the present invention. Exploded perspective view showing schematic configuration of liquid crystal display device Sectional drawing which shows the outline of a cross-sectional structure along the long side direction of a liquid crystal display device The top view which shows the arrangement structure of the LED board in the chassis with which a liquid crystal display device is equipped, a diffusion lens, and a holding member The bottom view which shows the arrangement structure of the ventilation fan and fan attachment member in the chassis with which a liquid crystal display device is equipped The top view which shows the arrangement configuration of a diffusion lens, an insertion hole, each ventilation hole, and a ventilation fan Bottom view showing arrangement of diffuser lens, insertion hole, air vents and blower fan An enlarged cross-sectional view showing a cross-sectional configuration along the short side direction of the liquid crystal display device Enlarged sectional view showing a sectional configuration along the long side direction of the liquid crystal display device The block diagram which shows roughly the electric structure in a television receiver The expanded sectional view which shows the cross-sectional structure along the short side direction of a liquid crystal display device, Comprising: The state which the one part ventilation fan act | operated and the reflective sheet deform | transformed The expanded sectional view which shows the cross-sectional structure along the long side direction of a liquid crystal display device, Comprising: The state which act | operated some ventilation fans and the reflective sheet deform | transformed The expanded sectional view which shows the cross-sectional structure along the short side direction of the liquid crystal display device which concerns on Embodiment 2 of this invention, Comprising: A one ventilation fan is actuated and the state which the reflective sheet deform | transformed is shown. FIG. 7 shows a cross-sectional configuration along the short side direction of the liquid crystal display device according to Embodiment 3 of the present invention, in which a part of the blower fans are rotated in the reverse direction to return the reflective sheet to its original shape. Enlarged sectional view showing The top view which shows arrangement | positioning structure of the diffusion lens which concerns on Embodiment 4 of this invention, an insertion hole, each ventilation hole, and a ventilation fan The top view which shows the arrangement structure of the diffusion lens which concerns on Embodiment 5 of this invention, an insertion hole, each ventilation hole, and a ventilation fan The top view which shows arrangement | positioning structure of the diffusion lens which concerns on Embodiment 6 of this invention, an insertion hole, each ventilation hole, and a ventilation fan The expanded sectional view which shows the cross-sectional structure along the short side direction of a liquid crystal display device, Comprising: The state which the one part ventilation fan act | operated and the reflective sheet deform | transformed The top view which shows arrangement | positioning structure of the diffusion lens which concerns on other embodiment (1) of this invention, an insertion hole, each ventilation hole, and a ventilation fan. The top view which shows arrangement | positioning structure of the diffusion lens which concerns on other embodiment (2) of this invention, an insertion hole, each ventilation hole, and a ventilation fan. The expanded sectional view which shows the cross-sectional structure along the short side direction of a liquid crystal display device, Comprising: The state which the one part ventilation fan act | operated and the reflective sheet deform | transformed

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. In this embodiment, the liquid crystal display device 10 is illustrated. In addition, a part of each drawing shows an X axis, a Y axis, and a Z axis, and each axis direction is drawn to be a direction shown in each drawing. Among these, the Y-axis direction coincides with the vertical direction, and the X-axis direction coincides with the horizontal direction. In addition, unless otherwise noted, the vertical direction is used as a reference for upper and lower descriptions. Moreover, let the upper side shown in FIG. 3 be a front side, and let the lower side of the figure be a back side.

As shown in FIG. 1, the television receiver TV according to the present embodiment includes a liquid crystal display device 10, front and back cabinets Ca and Cb that are accommodated so as to sandwich the liquid crystal display device 10, a power source P, a tuner T, And a stand S. The liquid crystal display device (display device) 10 has a horizontally long rectangular shape (rectangular shape, longitudinal shape) as a whole, and is supported in a state where its display surface is along the vertical direction (Y-axis direction). As shown in FIG. 2, the liquid crystal display device 10 includes a liquid crystal panel 11 that is a display panel and a backlight device (illumination device) 12 that is an external light source, which are integrated by a frame-like bezel 13 or the like. Is supposed to be retained.
Note that “the display surface of the liquid crystal display device 10 is along the vertical direction” as referred to in the present embodiment is not limited to an aspect in which the display surface of the liquid crystal display device 10 is parallel to the vertical direction, but from a direction along the horizontal direction. Also, it means that it is installed in a direction relatively along the vertical direction, and includes, for example, those inclined by 0 ° to 45 °, preferably 0 ° to 30 ° with respect to the vertical direction.

Next, the liquid crystal panel 11 and the backlight device 12 constituting the liquid crystal display device 10 will be described sequentially. Among these, the liquid crystal panel (display panel) 11 has a horizontally long rectangular shape when seen in a plan view, and a pair of glass substrates are bonded together with a predetermined gap therebetween, and a liquid crystal is formed between both glass substrates. It is set as the enclosed structure. One glass substrate is provided with a switching element (for example, TFT) connected to a source wiring and a gate wiring orthogonal to each other, a pixel electrode connected to the switching element, an alignment film, and the like. The substrate is provided with a color filter and counter electrodes in which colored portions such as R (red), G (green), and B (blue) are arranged in a predetermined arrangement, and an alignment film. A polarizing plate is disposed on the outside of both substrates.

The driving of the liquid crystal panel 11 having the above-described configuration is controlled by a liquid crystal panel control unit 32 as shown in FIG. The liquid crystal panel control unit 32 can output a control signal toward the liquid crystal panel 11 and control driving of the liquid crystal panel 11 based on the output signal output from the image signal processing unit 31. By supplying light from the backlight device 12 in cooperation with the control by the liquid crystal panel control unit 32, a desired image can be displayed on the display screen of the liquid crystal panel 11. An image signal such as a television broadcast signal input to the tuner T via the antenna 30 is input to the image signal processing unit 31. The image signal processing unit 31 converts the input signal into an image. In addition to processing, the processed signal can be output to the liquid crystal panel control unit 32 or the like.

Subsequently, the backlight device 12 will be described in detail. As shown in FIGS. 2 and 3, the backlight device 12 covers the chassis 14 having a substantially box shape having a light emitting portion 14 b opened on the liquid crystal panel 11 side, and the light emitting portion 14 b of the chassis 14. The optical member 15 group (diffusing plate (light diffusing member) 15a and a plurality of optical sheets 15b arranged between the diffusing plate 15a and the liquid crystal panel 11) and the outer edge of the chassis 14 are arranged. And a frame 16 for holding the outer edge of the group of optical members 15 between the chassis 14 and the frame 16. Further, in the chassis 14, an LED (Light Emitting Diode) 17 that is a light source, an LED board 18 on which the LED 17 is mounted, and a diffusing lens 19 attached to a position corresponding to the LED 17 on the LED board 18. Provided. Since the LED 17 and the diffusing lens 19 are disposed directly below the back surface of the liquid crystal panel 11 via the optical member 15, it can be said that the backlight device 12 is a so-called direct type. In the backlight device 12, the optical member 15 side is the light emission side from the LED 17. In addition, the chassis 14 includes a holding member 20 that can hold the LED board 18 between the chassis 14 and a reflection sheet 21 that reflects light in the chassis 14 toward the optical member 15. . On the other hand, a blower fan 22 having a function of cooling the LED 17 by blowing air into the chassis 14 is attached to the outside of the chassis 14 via a fan mounting member 24 (see FIGS. 8 and 9). ). In addition, illustration of the ventilation fan 22 is abbreviate | omitted in FIG. Below, each component of the backlight apparatus 12 is demonstrated in detail.

The chassis 14 is made of metal, and as shown in FIGS. 2 and 3, a bottom plate 14a having a rectangular shape like the liquid crystal panel 11, a side plate 14c rising from an outer end of each side of the bottom plate 14a, and each side plate 14c. And a receiving plate 14d projecting outward from the rising end of the first, and as a whole, has a shallow substantially box shape (substantially shallow dish shape) opened toward the front side. The long side direction of the chassis 14 coincides with the X-axis direction (horizontal direction), and the short side direction coincides with the Y-axis direction (vertical direction). A frame 16 and an optical member 15 described below can be placed on each receiving plate 14d in the chassis 14 from the front side. A frame 16 is screwed to each receiving plate 14d. The bottom plate 14a of the chassis 14 is provided with an attachment hole for attaching the holding member 20 at a position corresponding to the attachment position.

As shown in FIG. 2, the optical member 15 has a horizontally long rectangular shape when viewed in a plane, like the liquid crystal panel 11 and the chassis 14. As shown in FIG. 3, the optical member 15 has its outer edge portion placed on the receiving plate 14d, thereby covering the light emitting portion 14b of the chassis 14 and being interposed between the liquid crystal panel 11 and the LED 17. The The optical member 15 includes a diffusion plate 15a disposed on the back side (the side opposite to the LED 17 side and the light emitting side) and an optical sheet 15b disposed on the front side (the liquid crystal panel 11 side and the light emitting side). . The diffusing plate 15a has a structure in which a large number of diffusing particles are dispersed in a substantially transparent resin base material having a predetermined thickness, and has a function of diffusing transmitted light. The optical sheet 15b has a sheet shape that is thinner than the diffusion plate 15a, and two optical sheets 15b are laminated (see FIG. 2). Specific types of the optical sheet 15b include, for example, a diffusion sheet, a lens sheet, a reflective polarizing sheet, and the like, which can be appropriately selected and used.

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. An outer edge portion of the optical member 15 can be sandwiched between the frame 16 and each receiving plate 14d (see FIG. 3). The frame 16 can receive the outer edge portion of the liquid crystal panel 11 from the back side, and can sandwich the outer edge portion of the liquid crystal panel 11 with the bezel 13 arranged on the front side.

Next, the LED 17 and the LED board 18 on which the LED 17 is mounted will be described. As shown in FIGS. 3 and 8, the LED 17 has a configuration in which an LED chip is sealed with a resin material on a substrate portion fixed to the LED substrate 18. The LED chip mounted on the substrate unit has one main emission wavelength, and specifically, one that emits blue light in a single color is used. On the other hand, a phosphor that converts blue light emitted from the LED chip into white light is dispersed and blended in the resin material for sealing the LED chip. As a result, the LED 17 can emit white light. The LED 17 is a so-called top type in which a surface opposite to the mounting surface with respect to the LED substrate 18 is a light emitting surface.

As shown in FIGS. 3 and 4, the LED substrate 18 has a horizontally long and square plate shape as viewed in a plane that covers the entire bottom plate 14 a of the chassis 14, and the long side direction coincides with the X-axis direction. In the state where the short side direction coincides with the Y-axis direction, the chassis 14 is accommodated while extending along the bottom plate 14a. The base material of the LED substrate 18 is made of a metal such as the same aluminum material as that of the chassis 14, and a wiring pattern made of a metal film such as a copper foil is formed on the surface thereof via an insulating layer. In addition, as a material used for the base material of LED board 18, insulating materials, such as a ceramic, can also be used. The LED 17 having the above-described configuration is surface-mounted on the surface of the LED substrate 18 facing the front side (the surface facing the optical member 15 side). The LEDs 17 in the LED board 18 are arranged in a plurality of rows with the X axis direction (the long side direction of the chassis 14 and the LED board 18) as the row direction and the Y axis direction (the short side direction of the chassis 14 and the LED board 18) as the column direction. In parallel (in parallel with a matrix) and connected to a wiring pattern (not shown) formed on the LED substrate 18. Specifically, 18 LEDs 17 in the X-axis direction and 9 LEDs 17 in the Y-axis direction are arranged in parallel on the LED substrate 18. The arrangement pitch of the LEDs 17 is substantially constant, that is, it can be said that the LEDs 17 are arranged at equal intervals.

The LED drive unit 33 is connected to the wiring pattern formed on the LED substrate 18 as shown in FIG. The LED driving unit 33 can control the driving of each LED 17 based on the signal input from the image signal processing unit 31. Therefore, the LED drive unit 33 can appropriately control whether each LED 17 is turned on and the amount of light emitted from each LED 17 to be turned on according to the image displayed on the liquid crystal panel 11. Specifically, when the image displayed on the liquid crystal panel 11 includes a black display area BA and a non-black display area NBA, the LEDs 17 that mainly supply light to the non-black display area NBA are turned on. On the other hand, the LEDs 17 that can mainly supply light to the black display area BA are not lit. Further, the non-black display area NBA may include a bright portion LA having a relatively high luminance (relatively bright) and a dark portion DA having a relatively low luminance (relatively dark). Yes, in this case, each LED 17 that mainly supplies light to the bright area LA is turned on so that the amount of light emission is relatively large, while each LED 17 that mainly supplies light to the dark area DA. Is turned on so that the amount of emitted light is relatively small. The LED drive unit 33 can appropriately adjust the light emission amount (luminance) of each LED 17 by driving each LED 17 with constant current and PWM (Pulse Width Modulation) dimming. The PWM dimming driving is a driving method in which each LED 17 is periodically blinked and the time ratio between the lighting period and the extinguishing period is changed. As a result, a large light / dark difference can be secured between the black display area BA and the non-black display area NBA in the image, and a large light / dark difference is ensured between the bright area LA and the dark area DA in the non-black display area NBA. Therefore, high contrast performance can be obtained. In FIG. 10, only one LED 17 is shown for convenience.

The diffusing lens 19 is made of a synthetic resin material (for example, polycarbonate or acrylic) that is almost transparent (having high translucency) and has a higher refractive index than air. As shown in FIGS. 3 and 4, the diffusing lens 19 has a predetermined thickness and is formed in a substantially disk shape whose outer shape is larger than that of the LED 17 when viewed from above. Are individually attached from the front side, that is, so as to overlap each LED 17 in a plan view. Accordingly, the diffuser lenses 19 are arranged in parallel on the LED substrate 18 in a matrix, with the X-axis direction being the row direction and the Y-axis direction being the column direction, like the LEDs 17. The diffusing lens 19 can emit light having strong directivity emitted from the LED 17 while diffusing. That is, the directivity of the light emitted from the LED 17 is relaxed through the diffusing lens 19, so that even if the interval between the adjacent LEDs 17 is wide, the region between them is difficult to be visually recognized as the dark part DA. Thereby, it is possible to reduce the number of installed LEDs 17. The diffusing lens 19 is disposed at a position that is substantially concentric with the LED 17 in a plan view.

Of the diffusing lens 19, the surface facing the back side and facing the LED substrate 18 is a light incident surface 19 a on which light from the LED 17 is incident, whereas the surface facing the front side and facing the optical member 15 is the surface facing the optical member 15. The light exit surface 19b emits light. Among these, as shown in FIG. 8, the light incident surface 19a is formed in parallel with the plate surface (X-axis direction and Y-axis direction) of the LED substrate 18 as a whole. And the light incident side concave portion 19c is formed in the overlapping region, and thus has an inclined surface inclined with respect to the optical axis A of the LED 17. The light incident side concave portion 19 c has a substantially conical shape with an inverted V-shaped cross section and is disposed at a substantially central position in the diffusing lens 19. The light emitted from the LED 17 and entering the light incident side concave portion 19 c enters the diffusion lens 19 while being refracted at a wide angle by the inclined surface. Further, from the vicinity of the outer edge portion of the light incident surface 19a, a mounting leg portion 19d as a mounting structure for the LED substrate 18 is projected. The light emission surface 19b is formed in a flat and substantially spherical shape that bulges to the front side, and thereby allows the light emitted from the diffusion lens 19 to be emitted while being refracted at a wide angle. A light emitting side recess 19e having a substantially bowl shape is formed in a region of the light emitting surface 19b that overlaps the LED 17 when seen in a plan view. By this light emitting side recess 19e, most of the light from the LED 17 can be emitted while being refracted at a wide angle, or a part of the light from the LED 17 can be reflected to the LED substrate 18 side.

As described above, the diffuser lens 19 introduces the light emitted from the LED 17 to the light incident surface 19a and then emits the light from the light emitting surface 19b, so that the light output range is widened. It is possible to make it difficult to cause unevenness in the entire emitted light. And the emitted light from each diffuser lens 19 will each share the partial irradiation area | region which is a part of irradiation area | region by the emitted light of the whole backlight apparatus 12. FIG. In the present embodiment, the plurality of partial irradiation areas constituting the irradiation area are in a range in which the adjacent partial irradiation areas partially overlap each other, but in addition to that, all the partial irradiation areas The setting may be an independent (almost non-overlapping) range.

Subsequently, the holding member 20 will be described. The holding member 20 is made of a synthetic resin such as polycarbonate, and has a white surface with excellent light reflectivity. As shown in FIG. 3, the holding member 20 includes a main body portion 20 a along the plate surface of the LED substrate 18, and a fixing portion 20 b that protrudes from the main body portion 20 a toward the back side, that is, the chassis 14 side and is fixed to the chassis 14. A support portion 20c that protrudes from the main body portion 20a to the front side and supports the optical member 15. The main body portion 20a has a substantially disk shape and can hold both the LED board 18 and the reflection sheet 21 (bottom portion 21a) with the bottom plate 14a of the chassis 14. The fixing portion 20b can be locked to the bottom plate 14a while penetrating through an attachment hole 14e formed corresponding to the attachment position of the holding member 20 in the bottom plate 14a of the chassis 14. The support portion 20c can support the diffusion plate 15a of the optical member 15 from the back side, whereby the positional relationship in the Z-axis direction between the LED 17 and the optical member 15 can be maintained constant and the optical member. Fifteen inadvertent deformations can be regulated. As shown in FIG. 4, four holding members 20 are arranged near the corners of the four corners of the LED substrate 18, and each of the diffusion lenses 19 (LEDs 17) adjacent to each other in the X-axis direction and the Y-axis direction. It is arranged at a position between.

The reflection sheet 21 is made of a synthetic resin, and the surface has a white shape with excellent light reflectivity and a flexible sheet shape. As shown in FIGS. 2 and 3, the reflection sheet 21 is disposed on the inner surface side (the mounting surface side of the LED 17) of the LED substrate 18 and covers almost the entire area. The light emitted from each LED 17 by the reflection sheet 21 can be efficiently launched toward the optical member 15 side. Specifically, the reflection sheet 21 extends along the bottom plate 14a of the chassis 14 and covers the LED substrate 18 from the front side over almost the entire area, and rises from each outer end of the bottom portion 21a to the front side and the bottom portion 21a. The four rising portions 21b are inclined with respect to each other, and the extending portion 21c extends outward from the outer end of each rising portion 21b and is placed on the receiving plate 14d of the chassis 14. The bottom portion 21 a of the reflection sheet 21 is arranged so as to overlap the front side surface of each LED substrate 18, that is, the mounting surface of the LED 17 on the front side. Then, as shown in FIGS. 4 and 6, in the bottom portion 21 a of the reflection sheet 21, the diffusion lenses 19 and the LEDs 17 are individually inserted at positions overlapping with the diffusion lenses 19 and the LEDs 17 in plan view. A hole 21d is opened. The insertion holes 21d are arranged in parallel in rows and columns with the X-axis direction as the row direction and the Y-axis direction as the column direction at the bottom 21a, and the arrangement thereof is aligned with the arrangement of the LEDs 17 and the diffusing lens 19. . The insertion hole 21 d has an outer diameter dimension slightly larger than the outer diameter dimension of the diffusion lens 19, so that the dimensional tolerance of the reflection sheet 21 and the group generated when the reflection sheet 21 is laid in the chassis 14. It is possible to absorb the tolerance.

Now, as shown in FIGS. 8 and 9, the backlight device 12 according to the present embodiment can cool the LED 17, and further the relative positional relationship of the reflective sheet 21 with respect to the LED 17 and the diffusing lens 19. It is characterized in that it is provided with a blower fan 22 that can regulate the light output range of the diffusing lens 19 by changing the above. The blower fan 22 is attached to the outside of the back side of the chassis 14 via a fan mounting member 24, and the air blown from the blower fan 22 is passed through the bottom plate 14a of the chassis 14 and the LED board 18 respectively. It can be introduced into the chassis 14 through the

pores

14e and 18a. And since each

ventilation hole

14e and 18a is made into the form opened toward the bottom part 21a of the reflective sheet 21, while the air ventilated by the ventilation fan 22 contacts the bottom part 21a, the bottom part 21a is made into the LED board 18 with the wind pressure. Can be deformed so as to float to the front side from a flat state. Thereby, the bottom 21a is relatively displaced with respect to the LED 17 and the diffusing lens 19, and the light emission range of the diffusing lens 19 can be regulated by the hole edge of the insertion hole 21d. Hereinafter, the configuration of the blower fan 22, the fan mounting member 24, and the vent holes 14e and 18a will be described in detail.

8 and 9, the blower fan 22 includes a fan main body 22a attached to the fan attachment member 24 and a fan 22b rotatably supported in the fan main body 22a. Air inside and outside the fan mounting member 24 can freely enter and leave the fan body 22a, and external air can be blown toward the front side, that is, the bottom plate 14a side of the chassis 14 as the fan 22b rotates. Is done. Since the heat generated in the LED 17 is transmitted to the bottom plate 14a of the chassis 14 through the LED substrate 18, the air blown from the blower fan 22 is blown onto the bottom plate 14a to cool the bottom plate 14a. Can be indirectly cooled.

As shown in FIGS. 8 and 9, a chassis vent hole 14 e and a board vent hole 18 a are formed through the bottom plate 14 a and the LED board 18 of the chassis 14 so as to circulate air inside and outside. The chassis vent hole 14e and the substrate vent hole 18a are arranged so as to overlap each other when viewed in a plan view, and are communicated with each other and open toward the bottom portion 21a of the reflection sheet 21 in the chassis 14. Therefore, it is possible to introduce the air blown from the blower fan 22 into the chassis 14 and blow it onto the bottom 21 a of the reflection sheet 21. Specifically, as shown in FIGS. 6 and 7, the chassis vent hole 14 e and the substrate vent hole 18 a are arranged at positions that overlap with the hole edge of each insertion hole 21 d in the reflection sheet 21 in a plan view. A plurality of them are arranged along the hole edge (so as to surround the insertion hole 21d) in a substantially equal interval. Specifically, the chassis vent hole 14e and the board vent hole 18a are arranged side by side at positions with an angular interval of about 45 degrees so as to surround the insertion hole 21d.

Air blown from the blower fan 22 is passed through the chassis vent hole 14e and the board vent hole 18a configured as described above and introduced into the chassis 14, and the air blows against the bottom portion 21a with a predetermined wind pressure. Thus, the flat bottom portion 21a can be bent and deformed so as to float up to the front side. In addition, since the bottom part 21a has a predetermined play in the magnitude | size seen in the plane, the deformation | transformation which floats as mentioned above is enabled. Then, the floating height of the bottom portion 21a, that is, the amount of displacement, can be changed according to the output of the blower fan 22 (the blown amount, the number of revolutions of the fan 22b per unit time). The amount of displacement tends to increase as the output increases. In addition, most of the bottom part 21a except the location hold | maintained with respect to the LED board 18 and the chassis 14 with the holding member 20 floats as above, and can be deform | transformed.

When the bottom 21a is lifted from a flat state (the state shown in FIGS. 8 and 9) in contact with the plate surface of the LED substrate 18, the diffusion lens 19 with respect to the LED 17 and the diffusion lens 19 in the Z-axis direction, that is, the insertion hole 21d. The relative displacement occurs in the insertion direction. At this time, depending on the amount of lift of the bottom 21a (the amount of displacement accompanying the lift), the hole edge of the insertion hole 21d through which the diffusion lens 19 is inserted in the bottom 21a is the light emission path from the light emission surface 19b of the diffusion lens 19. It reaches a position that overlaps (see FIGS. 11 and 12). 11 and 12, the light emitted from the light exit surface 19b of the diffusing lens 19 and the air blown by the blower fan 22 are indicated by arrows, and the length of the arrow line indicates the amount of light emission and the amount of air blown. It represents. In this state, at least a part of the light emitted from the light exit surface 19b of the diffusing lens 19 hits the hole edge of the insertion hole 21d from the back side, so that the back side of the hole edge, that is, the raised bottom portion 21a and the bottom plate 14a, It will be reflected toward the space held between. For this reason, the light emission range of the diffusion lens 19 is restricted by the hole edge of the insertion hole 21d in the floated bottom portion 21a, and the restriction range is a hole of the insertion hole 21d with respect to the light emission path from the light emission surface 19b. The edge overlap amount, that is, the hole edge of the insertion hole 21d with respect to the diffusing lens 19 becomes higher (as the displacement amount of the hole edge caused by lifting increases) becomes wider. Accordingly, as the output of the blower fan 22 is increased, the amount by which the bottom 21a is lifted from the LED substrate 18 is increased, and the amount of overlap of the hole edge of the insertion hole 21d with respect to the light emission path from the diffusion lens 19 is increased. Since the range becomes wider, it can be said that the light output range of the diffusing lens 19 tends to become narrower. Thus, the hole edge of the insertion hole 21d in the bottom 21a of the reflection sheet 21 overlaps the light emission path of the light from the diffusion lens 19 and restricts the light emission range, and the light from the diffusion lens 19 It is possible to displace along the Z-axis direction between a release position that deviates from the emission path and does not restrict the light emission range.

Here, the light emitted from the light exit surface 19b of the diffusing lens 19 is diffused radially around the optical axis A as shown in FIGS. 8 and 9, and the angle formed with respect to the optical axis A. It can be said that the larger the angle is, the wider the angle is, but the light output range of the diffusing lens 19 is restricted from the wide angle side by the hole edge of the insertion hole 21d. That is, the restriction of the light output range of the diffusion lens 19 by the hole edge of the insertion hole 21d begins with the light on the widest angle side (the side closest to the horizontal direction) of the light emitted from the light emission surface 19b of the diffusion lens 19. The restriction range is extended from the widest angle side according to the height position of the hole edge.

The air blown from the blower fan 22 and introduced into the chassis 14 through the chassis vent hole 14e and the board vent hole 18a passes through a gap formed between the bottom portion 21a of the reflective sheet 21 that has floated and the bottom plate 14a of the chassis 14. It enters further into the chassis 14. At this time, the air that has entered the rear side of the chassis 14 is also supplied to the LED 17 and its surroundings, so that the heat emitted from the LED 17 can be dissipated. At this time, air is also supplied to the diffusing lens 19, so that the heat transferred from the LED 17 to the diffusing lens 19 can be dissipated. As described above, the LED 17 and its surroundings can also be cooled by the air blown from the blower fan 22 and introduced into the chassis 14.

The blower fan 22 is directly attached to the fan attachment member 24, and the fan attachment member 24 is attached to the chassis 14 indirectly by being attached to the chassis 14. The fan mounting member 24 is made of a metal plate like the chassis 14 and has a substantially box shape with an open surface on the chassis 14 side as a whole. As shown in FIGS. 5, 8 and 9, the fan mounting member 24 includes a base portion 24a having a flat plate shape extending along the bottom plate 14a of the chassis 14, a side portion 24b rising from the outer edge of the base portion 24a, and a base portion. The partition part 24c which forms the accommodation space S which accommodates the ventilation fan 22 separately by partitioning the space enclosed by 24a and the side part 24b is comprised. As shown in FIG. 5, the side portion 24b has a frame shape when seen in a plan view at the base portion 24a, whereas the partition portion 24c has a lattice shape at the base portion 24a. The X-axis direction is the row direction, and the Y-axis direction is the column direction.

Subsequently, the arrangement of the blower fan 22 will be described. As shown in FIGS. 4 and 5, the blower fan 22 is individually housed in each housing space S in the fan mounting member 24. A plurality of columns are arranged in parallel with the axial direction as the column direction. Specifically, as shown in FIGS. 6 and 7, the blower fan 22 is disposed at a position corresponding to the arrangement of the diffusion lens 19 (LED 17) in the chassis 14, and is about the X-axis direction and the Y-axis direction. It is arranged at a substantially middle position between adjacent diffuser lenses 19 (LEDs 17). Each blower fan 22 is disposed in a region between adjacent diffusion lenses 19 (LEDs 17) in the Y-axis direction, whereas in the region between adjacent diffusion lenses 19 (LEDs 17) in the X-axis direction. Every other one is arranged intermittently. The blower fan 22 and the accommodation space S are arranged in correspondence with the four LEDs 17 arranged two by two in the X-axis direction and the Y-axis direction, and are approximately equidistant to the four LEDs 17 with their center positions associated with each other. It is arranged to be. Four LEDs 17 associated with the blower fan 22 constitute one LED group 23. Therefore, as shown in FIG. 4 and FIG. 5, among the LEDs 17, the LEDs 17 located at both ends in the Y-axis direction constitute only one LED group 23 and are redundantly included in the plurality of LED groups 23. On the other hand, the LEDs 17 located at positions other than the both end positions in the Y-axis direction (center side excluding both ends) are included in the two LED groups 23 in an overlapping manner. The partition portion 24c that partitions the accommodation space S extends along the Y-axis direction, while the portion extending along the X-axis direction is arranged at a position that passes through the center of each LED 17 (each diffusing lens 19). The existing portion is arranged at a position passing through an almost intermediate position between the LEDs 17 (diffuse lenses 19) adjacent in the X-axis direction. Therefore, half of the ventilation fan 22 side communicates with the accommodation space S among the

ventilation holes

14e and 18a arranged around the four insertion holes 21d corresponding to the four LEDs 17 constituting the LED group 23. ing.

As shown in FIG. 10, a fan driving unit 34 connected to the image signal processing unit 31 is connected to the blower fan 22 described above. The fan drive unit 34 can control the drive of each blower fan 22 based on the signal input from the image signal processing unit 31. That is, since the fan drive unit 34 drives each blower fan 22 based on the signal from the image signal processing unit 31 like the LED drive unit 33, the fan drive unit 34 is associated with each LED 17 driven by the LED drive unit 33. Each blower fan 22 can be driven. Thereby, the fan drive unit 34 can appropriately drive each blower fan 22 in conjunction with the image displayed on the liquid crystal panel 11 and the drive state of each LED 17, and thus the operation of each blower fan 22. It is possible to appropriately control the amount of blown air when it is right or wrong. In FIG. 10, only one blower fan 22 is shown for convenience.

Specifically, when the image displayed on the liquid crystal panel 11 includes a black display area BA and a non-black display area NBA, each LED 17 (each of which can mainly supply light to the black display area BA) While the blower fan 22 associated with the LED group 23) is in an operating state, the blower fan 22 associated with each LED 17 (each LED group 23) that mainly supplies light to the non-black display area NBA. Is in a stopped state or an operating state in which the amount of air flow is relatively smaller than that of the air blowing fan 22 associated with the black display area BA. At this time, when each LED 17 that can mainly supply light to the black display area BA and each LED 17 that mainly supplies light to the non-black display area NBA are compared, displacement is caused by blowing from the blower fan 22. The former is wider than the latter with respect to the regulation range of the light emission range by the hole edge of the insertion hole 21d in the reflection sheet 21 to be performed. Here, since the bottom portion 21a of the reflection sheet 21 is in a sheet shape, the LED substrate is closer to the non-black display area NBA side from the black display area BA side in a state of being deformed so as to be lifted by the air blown from the blower fan 22. The amount of displacement from 18 gradually becomes smaller and has a gentle slope (see FIGS. 11 and 12). Accordingly, among the LEDs 17 associated with the non-black display area NBA, the LED 17 closest to each LED 17 associated with the black display area BA has the widest light emission range restriction range, thereby causing the non-black display area. The amount of light emitted from the LED 17 existing in the NBA and entering the black display area BA can be reduced.

Further, the non-black display area NBA may include a bright portion LA having a relatively high luminance (relatively bright) and a dark portion DA having a relatively low luminance (relatively dark). Yes, in that case, the blower fan 22 associated with each LED 17 that mainly supplies light to the dark part DA and the blower associated with each LED 17 that mainly supplies light to the bright part LA With respect to the fan 22, the former is operated so that the amount of air flow is relatively larger than the latter. At this time, the blower fan 22 according to the both may be operated together, or the blower fan 22 according to the latter may be stopped while the blower fan 22 according to the former is actuated. At this time, when each LED 17 that mainly supplies light to the dark part DA and each LED 17 that mainly supplies light to the bright part LA are compared, the reflective sheet 21 that is displaced by the air blown from the blower fan 22. The former is wider than the latter with respect to the restriction range of the light emission range due to the hole edge of the insertion hole 21d. Here, since the bottom portion 21a of the reflection sheet 21 is in a sheet shape, in a state where the bottom portion 21a is lifted by the air blown from the blower fan 22, the displacement from the LED substrate 18 becomes closer to the bright portion LA side from the dark portion DA side. It has a gentle slope with gradually decreasing amounts (see FIGS. 11 and 12). Accordingly, among the LEDs 17 associated with the bright portion LA, the LED 17 closest to the respective LEDs 17 associated with the dark portion DA has the widest light emission range restriction range, thereby emitting from the LEDs 17 existing in the bright portion LA. Thus, the amount of light entering the dark portion DA side can be reduced. Note that the fan drive unit 34 can control the number of rotations per unit time of the fan 22b, that is, the amount of blown air, by adjusting the current value or voltage value supplied to each blower fan 22.

Subsequently, a specific correspondence between the LED 17 and the blower fan 22 associated with the LED 17 will be described. Here, for convenience of explanation, as shown in FIGS. 6 and 7, four LEDs in the X axis direction and three in the Y axis direction are arranged from among the LEDs 17 dispersedly arranged in the chassis 14. A total of 12 LEDs 17 and four blower fans 22 associated with the LEDs 17 are taken up. Among the twelve LEDs 17, the three LEDs 17 forming the leftmost column shown in FIG. 6 are sequentially designated as the first LED 17A, the second LED 17B, and the third LED 17C from the top of the figure, and the three LEDs 17 forming the right column of the figure are The fourth LED 17D, the fifth LED 17E, and the sixth LED 17F are sequentially arranged from the top of the figure, and the three LEDs 17 forming the column on the right side of the figure are the seventh LED 17G, the eighth LED 17H, and the ninth LED 17I in order from the top of the figure. The three LEDs 17 forming a row are the tenth LED 17J, the eleventh LED 17K, and the twelfth LED 17L in order from the top of the figure. In the following description, the subscripts A to L are added to the reference numerals when distinguishing the LEDs 17, and the subscripts are not attached to the reference signs when collectively referring to the individual LEDs 17. Also, in FIG. 7, the left and right are reversed from FIG.

The twelve LEDs 17 described above constitute four LED groups 23 (first LED group 23A to fourth LED group 23D). Each LED group 23 includes four LEDs 17 that are adjacent in the X-axis direction and the Y-axis direction. Specifically, the upper left four LEDs 17 (first LED 17A, second LED 17B, fourth LED 17D, fifth LED 17E) shown in FIG. 6 represent the first LED group 23A, and the lower left four LEDs 17 (second LED 17B, third LED 17C, fifth LED 17E). , The sixth LED 17F), the second LED group 23B, the four LEDs 17 (the seventh LED 17G, the eighth LED 17H, the tenth LED 17J, the eleventh LED 17K) on the upper right side of the figure, the the third LED group 23C, and the four LEDs 17 (eighth LED 17H, The ninth LED 17I, the eleventh LED 17K, and the twelfth LED 17L) constitute the fourth LED group 23D. In the following, when distinguishing the LED groups 23, suffixes A to D are attached to the reference numerals, and when referring generically without distinction, the suffixes are not attached to the reference signs.

The second LED 17B and the fifth LED 17E are included in both the first LED group 23A and the second LED group 23B, whereas the first LED 17A, the third LED 17C, the fourth LED 17D, and the sixth LED 17F are respectively the first LED group 17A or It is included only in one of the second LED groups 17B. Similarly, the eighth LED 17H and the eleventh LED 17K are included in both the third LED group 23C and the fourth LED group 23D, whereas the seventh LED 17G, the ninth LED 17I, the tenth LED 17J, and the twelfth LED 17L are respectively the third LED group 17C. Or it is contained only in either of 4th LED group 17D.

Then, as shown in FIG. 6, each LED group 23 is driven in association with a blower fan 22 that is positioned at the approximate center of each LED group 23 in a plan view. Specifically, the first LED group 23A located at approximately the center is the first blower fan 22A, the second LED group 23B located approximately at the center is the second blower fan 22B, and the third LED group 23C. What is positioned approximately in the center is the third blower fan 22C, and what is positioned approximately in the center of the fourth LED group 23D is the fourth blower fan 22D. In the following description, the subscripts A to D are attached to the reference numerals when distinguishing the blower fans 22, and the subscripts are not attached to the reference numerals when not collectively distinguished.

6 and 7, an example in which twelve LEDs 17 and four blowing fans 22 associated therewith are taken up has been described. However, the LEDs 17 and the blowing fans 22 that are actually installed in the liquid crystal display device 10. It goes without saying that it can be changed as appropriate according to the number of installed and the arrangement thereof.

This embodiment has the structure as described above, and its operation will be described next. As shown in FIG. 10, when an image signal such as a television broadcast signal is input to the image signal processing unit 31 via the antenna 30 and the tuner T, the output signal is processed after the image processing there, and the liquid crystal panel control unit 32, It is output to the LED drive unit 33 and the fan drive unit 34, respectively. Then, the driving of the liquid crystal panel 11 is controlled by the liquid crystal panel control unit 32, the LEDs 17 and the blower fans 22 are driven by the LED driving unit 33 and the fan driving unit 34, and the backlight device 12 moves to the liquid crystal panel 11. Illumination light is irradiated, and a predetermined image is displayed on the liquid crystal panel 11. At this time, the liquid crystal panel 11 shutters the light emitted from the backlight device 12 by driving a switching element (TFT).

Here, the LED driving unit 33 individually controls the driving of the LEDs 17 based on the signal input from the image signal processing unit 31. At this time, when the image displayed on the liquid crystal panel 11 includes the black display area BA and the non-black display area NBA, the arrangement (specifically, the light is mainly supplied to the non-black display area NBA). For example, each LED 17 that is set to be superimposed on the non-black display area NBA in a plan view is turned on, and an arrangement that can mainly supply light to the black display area BA (specifically, for example, black display) The LEDs 17 that are arranged so as to overlap the area BA in plan view are not lit. Thus, by performing so-called local dimming control that synchronizes the lighting / non-lighting of each LED 17 with the display image, it is possible to ensure a large difference in brightness between the black display area BA and the non-black display area NBA. Therefore, in addition to being able to obtain high contrast performance and excellent display quality, it is possible to reduce power consumption. In particular, depending on the type of image signal input to the liquid crystal display device 10, the upper and lower ends or the left and right ends of the display screen may always be the black display area BA. It is preferable to control so that the LED 17 corresponding to the display area BA is always unlit and the LED 17 corresponding to the non-black display area NBA at the center of the screen is always lit.

Further, a bright portion LA having a relatively high luminance (relatively bright) and a dark portion DA having a relatively low luminance (relatively dark) in the non-black display area NBA in the image displayed on the liquid crystal panel 11. Is included so that each LED 17 that mainly supplies light to the bright area LA is turned on so that the amount of light emission is relatively large, while each LED 17 that mainly supplies light to the dark area DA Is turned on so that the amount of emitted light is relatively small. While each LED 17 is arranged so as to mainly supply light to the bright part LA (specifically, for example, an arrangement overlapping the bright part LA in plan view), the LED 17 is turned on so that the light emission amount is relatively large. The LEDs 17 that are arranged so as to mainly supply light to the dark part DA (specifically, for example, an arrangement that overlaps with the dark part DA in plan view) are turned on so that the amount of emitted light is relatively small. Thus, by performing so-called local dimming control in which the light emission amount of each LED 17 corresponding to the non-black display area NBA is synchronized with the display image, it is possible to ensure a large difference in brightness between the bright area LA and the dark area DA. Therefore, higher contrast performance can be obtained and display quality is further improved.

On the other hand, the fan driving unit 34 receives each signal supplied from the image signal processing unit 31 to drive each blower fan 22 in a manner interlocking with the driving state of the LED 17 described above. Specifically, the image signal processing unit 31 supplies a signal related to position information about the X-axis direction and the Y-axis direction in the image and a gradation value at each position to the fan driving unit 34. The fan driving unit 34 Based on the signal, the operation of each blower fan 22 associated with each LED 17 and the number of rotations of the fan 22b per unit time during operation are controlled.

Specifically, the image displayed on the liquid crystal panel 11 includes a black display area (area where the gradation value is 0) BA and a non-black display area (area where the gradation value is in the range of 1 to 255) NBA. If included, each blower fan 22 associated with each LED 17 arranged to be able to mainly supply light to the black display area BA is activated, while the non-black display area NBA is mainly operated. The air blowing fans 22 associated with the LEDs 17 arranged to supply light to the LED 17 are stopped, or the air blowing amount is relatively smaller than the air blowing fans 22 associated with the black display area BA. Operate to

More specifically, for example, as shown in FIGS. 6 and 7, the first LED group 23A and the third LED group 23C are in the black display area BA, and the second LED group 23B and the fourth LED group 23D are in the non-black display area NBA. When the arrangement relationship is such that light can be mainly supplied, the first blower fan 22A and the third blower fan 22C associated with the first LED group 23A and the third LED group 23C as shown in FIG. On the other hand, the second blower fan 22B and the fourth blower fan 22D associated with the second LED group 23B and the fourth LED group 23D are stopped or more than the first blower fan 22A and the third blower fan 22C. Operate so that the air flow is relatively low. For example, as shown in FIGS. 6 and 7, the first LED group 23A and the second LED group 23B are mainly in the black display area BA, and the third LED group 23C and the fourth LED group 23D are mainly in the non-black display area NBA. When the arrangement relationship is such that light can be supplied, as shown in FIG. 12, the first blower fan 22A and the second blower fan 22B associated with the first LED group 23A and the second LED group 23B are operated. The third blower fan 22C and the fourth blower fan 22D associated with the third LED group 23C and the fourth LED group 23D are stopped, or the blower amount is relative to the first blower fan 22A and the second blower fan 22B. Operate so that it is less.

When each blower fan 22 is driven by the fan drive unit 34 as described above, as shown in FIG. 11 and FIG. 12, the blower fan 22 that is actuated from the chassis ventilation hole 14 e of the chassis 14 and the board passage of the LED board 18. While the air is blown into the chassis 14 through the air holes 18a, the bottom 21a of the reflection sheet 21 is deformed so as to be lifted from a flat state by the wind pressure. The bottom portion 21a that has been lifted and deformed has a gentle slope with the amount of displacement from the LED substrate 18 gradually decreasing from the black display area BA side toward the non-black display area NBA side. The amount of air blown from each blower fan 22 (wind pressure) at this time is such that, in the black display area BA, the hole edge of the insertion hole 21d in the raised bottom 21a is the light exit path from the light exit surface 19b in the corresponding diffuser lens 19. In contrast, in the non-black display area NBA, the hole edge of the insertion hole 21d does not overlap the light exit path from the light exit surface 19b of the corresponding diffusing lens 19, or the overlap amount. Is smaller than the black display area BA side. Therefore, the hole edge of the insertion hole 21d through which each diffusion lens 19 capable of mainly supplying light to the black display area BA is inserted restricts the light output range of each insertion diffusion lens 19 over a relatively wide range. In contrast, the hole edge of the insertion hole 21d through which each diffusion lens 19 that mainly supplies light to the non-black display area NBA is inserted does not restrict the light emission range of each diffusion lens 19 that is inserted. Or, it is restricted only in a relatively narrow range. Of the diffusing lenses 19 that mainly supply light to the non-black display area NBA, they are adjacent to the diffusing lens 19 that can mainly supply light to the black display area BA (non-black display area The diffuser lens 19 (located at the boundary between the NBA and the black display area BA) has a gently sloping bottom portion 21a as described above, so that only the portion on the black display area BA side of the light output range has a hole edge of the insertion hole 21d. Idemitsu is regulated by. Thereby, since the emitted light from the diffuser lens 19 is less likely to leak to the black display area BA, it is possible to secure a larger difference in brightness between the black display area BA and the non-black display area NBA. Therefore, higher contrast performance can be obtained.

Further, the non-black display area NBA in the image displayed on the liquid crystal panel 11 has a bright portion LA having relatively high luminance (relatively high gradation value) and relatively low luminance (relatively). In the case where the dark part DA (which has a low gradation value) is included, the air flow of the blower fan 22 associated with each LED 17 that mainly supplies light to the dark part DA is operated to be relatively large. The air blower 22 associated with each LED 17 that mainly supplies light to the light portion LA is operated so as to be relatively small or not operated. Then, as shown in FIGS. 11 and 12, the bottom portion 21 a of the reflection sheet 21 is deformed by being lifted from a flat state by the blown air from the blower fan 22 that has been actuated. The bottom portion 21a that has been lifted and deformed has a gentle slope with the amount of displacement from the LED substrate 18 gradually decreasing from the dark portion DA side toward the bright portion LA side. At this time, the amount of air blown from each blower fan 22 (wind pressure) is such that, in the dark portion DA, the overlap amount of the hole edge of the insertion hole 21d with respect to the light exit path from the light exit surface 19b of the corresponding diffusion lens 19 is the bright portion LA side. In contrast, in the bright portion LA, the overlapping amount of the hole edge of the insertion hole 21d with respect to the light exit path from the light exit surface 19b in the corresponding diffuser lens 19 is on the dark portion DA side. The amount is such that it is smaller than the comparison or does not overlap at all. Therefore, the hole edge of the insertion hole 21d through which each diffusion lens 19 that mainly supplies light to the dark part DA is inserted regulates the light emission range of each insertion diffusion lens 19 over a relatively wide range. On the other hand, the hole edge of the insertion hole 21d through which each diffusion lens 19 that mainly supplies light to the bright portion LA is inserted does not restrict the light emission range of each diffusion lens 19 that is inserted, or relatively It is assumed that it is restricted only in a narrow range. Of the diffusing lenses 19 that mainly supply light to the bright portion LA, the diffusing lenses 19 that mainly supply light to the dark portion DA are adjacent to each other (the boundary between the bright portion LA and the dark portion DA). The diffusing lens 19 is regulated by the bottom edge 21a having a gentle slope as described above, and the light emission is restricted by the edge of the insertion hole 21d only in the dark part DA side of the light emission range. As a result, the light emitted from the diffusing lens 19 is less likely to leak to the dark part DA side, so that a greater difference in brightness between the dark part DA and the bright part LA can be secured, and thus higher contrast performance can be achieved. Obtainable.

Further, as shown in FIGS. 11 and 12, the air blown from the blower fan 22 is blown to the bottom plate 14a of the chassis 14, so that the heat transmitted from the LED 17 to the bottom plate 14a via the LED substrate 18 is efficiently performed. Can be dissipated. In addition, the air blown from the blower fan 22 is supplied into the chassis 14 through the vent holes 14e and 18a of the chassis 14 and the LED board 18, and the bottom 21a and the bottom plate 14a of the reflecting sheet 21 that has floated up are supplied. By being introduced into the back side of the chassis 14 through a gap formed between them, the LED 17 is sprayed on itself or is also sprayed on the diffusion lens 19 around the LED 17 itself, thereby further promoting heat dissipation from the LED 17. .

As described above, the backlight device (illumination device) 12 of the present embodiment has a plurality of LEDs (light sources) 17 and an insertion hole (light source insertion) that forms a sheet extending in a region extending over the plurality of LEDs 17 and passes the LEDs 17. A reflection sheet (movable light output restricting portion) 21 capable of restricting the light emission range of the LED 17 by having a hole 21d and at least the edge of the insertion hole 21d displaced relative to the LED 17, and the reflection A blower fan (blower unit) 22 that can change the relative positional relationship of the reflection sheet 21 with respect to the LEDs 17 by blowing air to the sheet 21 and can include a plurality of LEDs 17 having different light output ranges is provided.

In this way, when the plurality of LEDs 17 are turned on, the light emitted from each LED 17 is emitted as the emitted light of the backlight device 12. Here, in the irradiation area by the emitted light of the backlight device 12, the required brightness may differ depending on the part (for example, the black display area BA and the non-black display area NBA, the dark part DA and the bright part LA). In that case, the relative positional relationship of the reflective sheet 21 with respect to the LEDs 17 is changed by blowing air from the blower fan 22 to the reflective sheet 21 having a sheet shape extending in a region extending over the plurality of LEDs 17. As a result, it is possible to displace at least the edge of the insertion hole 21d in the reflection sheet 21 relative to the LED 17 and to include a plurality of LEDs 17 having different light emission ranges. The brightness of the irradiation area can be made appropriate in each part.

Moreover, the blower fan 22 can dissipate heat from the LED 17 by blowing air around the LED 17 or the LED 17. If it does in this way, it will be possible to dissipate the heat | fever from LED17 and to cool LED17 by ventilating around LED17 or LED17 with the ventilation fan 22, and it prevents that the luminous efficiency of LED17 falls by it. The effect of being able to do is acquired. Moreover, since the ventilation fan 22 has both the function which changes the relative positional relationship of the reflective sheet 21 with respect to LED17, and the cooling function which cools LED17, a dedicated structure is tentatively provided for every function, respectively. Compared with the case where it is provided separately, the structure can be simplified, which is useful in reducing the cost. Here, “around the LED 17” refers to air or a structure existing near the LED 17.

Moreover, while the LED 17 and the reflection sheet 21 are accommodated inside, the chassis 14 to which the blower fan 22 is attached is provided, and the chassis 14 opens toward the reflection sheet 21 and from the blower fan 22. A chassis ventilation hole 14e through which the air flows is formed. In this way, the air from the blower fan 22 attached to the outside of the chassis 14 is supplied toward the reflection sheet 21 in the chassis 14 through the chassis ventilation hole 14e, so that the reflection sheet 21 relative to the LED 17 is relative. The positional relationship is changed, so that the light emission range of the LED 17 can be regulated.

In addition, a plurality of LEDs 17 are mounted, and an LED substrate 18 that is accommodated in the chassis 14 is provided. The LED substrate 18 opens toward the reflection sheet 21 and communicates with the chassis ventilation hole 14e. 18a is formed. In this way, the air sent from the blower fan 22 attached to the outside of the chassis 14 is supplied toward the reflective sheet 21 in the chassis 14 through the chassis vent hole 14e and the board vent hole 18a, so that the reflective sheet for the LED 17 is provided. The relative positional relationship of 21 is changed, so that the light emission range of the LED 17 can be regulated.

Further, the chassis vent hole 14e and the substrate vent hole 18a are arranged at positions that open toward the edge of the insertion hole 21d in the reflection sheet 21. In this way, since the air blown from the blower fan 22 is directly supplied to the edge of the insertion hole 21d in the reflection sheet 21 through the chassis ventilation hole 14e and the board ventilation hole 18a, the light emission range of the LED 17 is reduced. It can be regulated more accurately.

Also, the movable light output restricting portion is a reflecting sheet (reflecting member) 21 that reflects light from the LED 17. If it does in this way, the light emission range of LED17 can be controlled using the reflective sheet 21 which reflects the light from LED17. Therefore, as compared with the case where the reflection sheet and the movable light output restricting portion are separately provided, the structure can be simplified, which is useful in reducing the cost.

A plurality of blower fans 22 are arranged at positions corresponding to the arrangement of the plurality of LEDs 17, and an LED drive unit (light source drive unit) 33 that drives the plurality of LEDs 17 and a blower fan 22 associated with the LEDs 17. And a fan drive unit (fan drive unit) 34 for driving the motor. In this way, since the plurality of blower fans 22 are arranged at positions corresponding to the arrangement of the plurality of LEDs 17, the plurality of LEDs 17 are driven by the LED drive unit 33 and the LEDs 17 are handled by the fan drive unit 34. By driving the attached blower fan 22, the light emission range of the LED 17 can be more appropriately regulated.

In addition, the LED drive unit 33 drives the plurality of LEDs 17 so that the relatively bright LEDs 17 and the relatively dark LEDs 17 are included, whereas the fan drive unit 34 has the reflective sheet 21 at least relatively relatively. The blower fan 22 is driven so as to regulate the light output range of the relatively bright LED 17 adjacent to the dark LED 17. In this way, the brightness of the irradiation area by the emitted light of the backlight device 12 is driven by the LED drive unit 33 so that the plurality of LEDs 17 are driven to include the relatively bright LEDs 17 and the relatively dark LEDs 17. Can be controlled more appropriately depending on the part. In addition, by driving the blower fan 22 by the fan driving unit 34, the light emission range of the relatively bright LED 17 adjacent to at least the relatively dark LED 17 is regulated by the reflection sheet 21. In the irradiation area by the emitted light of the apparatus 12, light on the bright area LA side can be effectively prevented from leaking to the dark area DA side, so that the brightness of the irradiation area can be more appropriately controlled according to the area. it can.

In addition, the LED driving unit 33 drives the plurality of LEDs 17 so that a plurality of relatively bright LEDs 17 and a plurality of relatively dark LEDs 17 are included, whereas the fan driving unit 34 has the reflective sheet 21 relative to each other. In addition to the relatively bright LEDs 17 adjacent to the dark LEDs 17, the blower fan 22 is driven so as to regulate the light output range for a plurality of relatively dark LEDs 17. In this way, by driving the blower fan 22 by the fan drive unit 34, in addition to the relatively bright LEDs 17 adjacent to the relatively dark LEDs 17, the light output range is also applied to a plurality of relatively dark LEDs 17. Therefore, compared with the case where the light emission range is selectively restricted only for the relatively bright LED 17 adjacent to the relatively dark LED 17, the light emission range of the LED 17 is easily restricted by the reflection sheet 21. be able to. Moreover, compared with the case where the light emission range is regulated for a plurality of relatively bright LEDs 17, it is possible to suppress a decrease in luminance that may occur in the emitted light.

Further, the fan driving unit 34 drives the plurality of blower fans 22 in association with the plurality of LED groups 23 each including the LEDs 17. In this way, it is possible to reduce the number of the blower fans 22 installed and to reduce the cost as compared with a case where the same number of blower fans as the LEDs 17 are installed and individually associated and driven. It becomes.

Moreover, the liquid crystal display device (display device) 10 of the present embodiment includes the backlight device 12 described above and a liquid crystal panel (display panel) 11 that displays an image using light from the backlight device 12. Prepare. According to such a liquid crystal display device 10, the backlight device 12 that supplies light to the liquid crystal panel 11 can appropriately adjust the brightness and darkness of the emitted light, so that the contrast performance can be improved and displayed. It is possible to realize a display with excellent quality.

Further, the liquid crystal display device 10 includes an image signal processing unit 31 that processes a signal related to an image, and a liquid crystal panel control unit 32 that controls driving of the liquid crystal panel 11 based on an output signal from the image signal processing unit 31. The LED driving unit 33 that drives the plurality of LEDs 17 based on the output signal from the image signal processing unit 31 and the fan that drives the blower fan 22 associated with the LED 17 based on the output signal from the image signal processing unit 31 And a drive unit 34. In this way, by driving the LED 17 by the LED driving unit 33 based on the output signal from the image signal processing unit 31, for example, the LED 17 corresponding to a region other than the black display area BA in the displayed image is turned on. The LED 17 corresponding to the black display area BA can be turned off. Thereby, the contrast performance of a display image can be improved. Then, based on the output signal from the image signal processing unit 31, for example, the fan fan 22 associated with the LED 17 that has not been lit by the fan drive unit 34 is driven, while the LED 17 is associated with the lit LED 17. By not driving the blower fan 22, the power consumption can be reduced, and the contrast performance can be further improved by appropriately regulating the light emission range for the LED 17 that needs to regulate the light emission range.

<Embodiment 2>
A second embodiment of the present invention will be described with reference to FIG. In this Embodiment 2, what changed the drive method of LED117 is shown. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

In this embodiment, as shown in FIG. 13, the plurality of LEDs 117 mounted on the LED board 118 are driven so that the light emission amounts (luminances) are substantially equal to each other. Specifically, the LEDs 117 are connected in series by a wiring pattern on the LED substrate 118, and are thereby lit with substantially the same amount of light emission. Each LED 117 is driven so that the light emission amount varies according to the luminance of the image displayed on the liquid crystal panel 11. For example, when displaying a dark image, each LED 117 is driven so that the light emission amount is reduced. When displaying a bright image, all the LEDs 117 are driven so as to increase the light emission amount. In FIG. 13, the emitted light from the light exit surface 19b of the diffusing lens 19 and the air blown by the blower fan 122 are illustrated by arrows, and the length of the arrow represents the amount of light emission and the amount of air blown. ing.

When the image displayed on the liquid crystal panel 11 includes the black display area BA and the non-black display area NBA, or when the non-display area NBA includes the dark part DA and the bright part LA, the liquid crystal panel 11 In addition to shuttering the light emitted from the backlight device 112 by driving the switching elements (TFTs) provided in the respective areas in association with each region, the blower fans 122 are configured in the same manner as in the first embodiment. To improve contrast performance. That is, for each LED 117 that can mainly supply light to the black display area BA and the dark part DA, the light emission range is regulated by the hole edge of the insertion hole 21d in the reflection sheet 21 displaced in accordance with the operation of the blower fan 122. On the other hand, for each LED 117 that mainly supplies light to the non-black display area NBA and the bright area LA, the light emission range is restricted by the hole edge of the insertion hole 21d in the reflection sheet 21 is narrower than the former. Or not regulated at all. As a result, even in the liquid crystal display device 110 using the backlight device 112 configured to emit all the LEDs 117 with substantially the same luminance, the non-black display area NBA side / bright part on the black display area BA side / dark part DA side. The light from the LED 117 existing on the LA side hardly leaks, and the contrast performance can be improved. In the backlight device 112 having such a configuration, the configuration related to the driving of the LED 117 is simplified, so that the manufacturing cost and the like can be reduced. In addition, the detailed description regarding the drive of the ventilation fan 122 is the same as that of Embodiment 1, and the overlapping description is omitted.

<Embodiment 3>
Embodiment 3 of the present invention will be described with reference to FIG. In the third embodiment, the blower fan 222 is rotatable in both forward and reverse directions. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

As shown in FIG. 14, the blower fan 222 according to the present embodiment is capable of rotating in either the forward or reverse direction. When the blower fan 222 is rotated in the forward direction, it draws air outside the fan mounting member 24 and blows it toward the bottom plate 14a of the chassis 14, whereas when it is rotated in the reverse direction, the fan mounting is performed. The air inside the member 24 is blown out toward the outside. Accordingly, when the blower fan 222 is rotated in the reverse direction after being rotated in the forward direction, the air in the chassis 14 is discharged to the outside through the vent holes 14e and 18a of the chassis 14 and the LED board 18, The bottom portion 21 a of the reflecting sheet 21 that has been lifted is drawn toward the LED substrate 18, and finally reaches a flat state along the plate surface of the LED substrate 18. At this time, the hole edge of the insertion hole 21d in the bottom portion 21a is brought from the restriction position that restricts the light emission range of the diffusing lens 19 to the restriction release position that does not restrict the light emission range. Therefore, when the image displayed on the liquid crystal panel 11 changes, for example, when the black display area BA and the non-black display area NBA are switched, or when the dark area DA and the bright area LA are switched in the non-black display area NBA. However, it is possible to always obtain high contrast performance by appropriately operating the blower fan 222 to rotate in either the forward or reverse direction following the change.

As described above, according to the present embodiment, the blower section is composed of the blower fan 222 that can rotate in either the forward or reverse direction. If it does in this way, the relative positional relationship of the reflective sheet 21 with respect to LED17 can be changed freely by rotating the ventilation fan 222 to a normal direction or a reverse direction. As a result, it is possible to easily control the light emission range of the LED 17 and to release the restriction state, thereby making the brightness of the irradiation area by the emitted light more appropriate in each part. it can.

<Embodiment 4>
A fourth embodiment of the present invention will be described with reference to FIG. In the fourth embodiment, the arrangement and number of the chassis vent holes 314e of the chassis 314 and the board vent holes 318a of the LED board 318 are changed. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

In the present embodiment, the chassis vent 314e of the chassis 314 and the board vent 318a of the LED board 318 are arranged at approximately the middle position between the adjacent LEDs 17 (diffuse lens 19) as shown in FIG. In other words, the chassis vent hole 314e and the board vent hole 318a are disposed at a substantially middle position of the adjacent insertion hole 21d in the bottom 21a of the reflection sheet 21, and are located away from the hole edge of the insertion hole 21d. It will be arranged. Specifically, the chassis vent holes 314e and the board vent holes 318a are arranged at positions that are spaced apart from each other by about 90 degrees in the circumferential direction of the insertion hole 21d. It consists of what is arranged at a substantially equal position and that which is arranged at a position where the distances from adjacent LEDs 17 in the Y-axis direction are substantially equal. Further, the chassis vent hole 314e and the board vent hole 318a are relatively larger in size in plan view than those described in the first embodiment (see FIG. 6). It is possible to keep the circulation amount of the air blown from the same as that in the first embodiment.

<Embodiment 5>
A fifth embodiment of the present invention will be described with reference to FIG. In the fifth embodiment, the arrangement and number of the chassis vent holes 414e of the chassis 414 and the board vent holes 418a of the LED board 418 are further changed. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

In the present embodiment, the chassis vent hole 414e of the chassis 414 and the board vent hole 418a of the LED board 418 are arranged at positions where they overlap with the hole edge of the insertion hole 21d in the reflection sheet 21 as seen in a plan view as shown in FIG. At the same time, six of them are arranged along the hole edge (so as to surround the insertion hole 21d) so as to be arranged at almost equal intervals. Specifically, six chassis vent holes 414e and substrate vent holes 418a are arranged side by side so as to surround the insertion hole 21d and at an angular interval of about 60 degrees.

<Embodiment 6>
Embodiment 6 of the present invention will be described with reference to FIG. 17 or FIG. In the sixth embodiment, a slit 25 is formed in the bottom 521a of the reflection sheet 521. In addition, the overlapping description about the same structure, an effect | action, and effect as above-mentioned Embodiment 1 is abbreviate | omitted.

As shown in FIG. 17, a slit 25 having a shape that opens to the insertion hole 521d is formed in the bottom 521a of the reflection sheet 521 according to the present embodiment. Four slits 25 are formed so as to form a cruciform shape at the hole edge of the insertion hole 521d, and are arranged at positions spaced apart by about 90 degrees in the circumferential direction of the insertion hole 521d. These slits 25 form four cantilever pieces 26 at the hole edge of the insertion hole 521d. As shown in FIG. 18, each piece 26 has an opening to the insertion hole 521d of the slit 25, with the back end of the slit 25 (the end opposite to the opening end to the insertion hole 521d) as the base end. It is possible to bend and deform with the end portion as a free end, and the amount of displacement of the free end becomes maximum in the bent state. And the chassis ventilation hole 14e of the chassis 14 and the board | substrate ventilation hole 18a of the LED board 18 are set as the arrangement | positioning superimposed on planar view with respect to the piece part 26 which is a hole edge of the insertion hole 521d. Therefore, when the air blown from the blower fan 22 is introduced into the chassis 14 through the vent holes 14e and 18a, the piece portion 26 is pushed up by the wind pressure to be bent and deformed. At this time, the bottom portion 521a of the reflection sheet 521 is not deformed as a whole, but only the one portion 26 that has received the air is locally deformed. The deformed piece 26 can regulate the light output range of the diffusion lens 19 depending on the amount of displacement from the LED substrate 18.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In each of the above-described embodiments, a configuration in which a plurality of blower fans are associated with and driven with respect to a predetermined LED is shown. However, a blower fan overlaps with all LEDs. What is regarded as a correspondence relationship that does not occur is also included in the present invention. For example, as shown in FIG. 19, each blower fan 22-1 is configured to be driven in association with four LEDs 17-1, and four LEDs 17-1 associated with one blower fan 22-1 are provided. The configuration may be such that it is not associated with the other blower fan 22-1. At this time, all the ventilation holes 14e-1 and 18a-1 arranged around the insertion holes 21d-1 through which the corresponding LEDs 17-1 are inserted communicate with the accommodation space for accommodating the blower fan 22-1. Yes.

(2) In each of the above-described embodiments, the blower fan is arranged in association with a plurality of LEDs and driven, but for example, as shown in FIGS. 20 and 21, the blower fan 22. It is also possible to adopt a configuration in which −2 is individually associated with LED 17-2 and driven. In this case, all the blower fans 22-2 associated with the LEDs 17-2 capable of mainly supplying light to the black display area BA are not operated, and light is mainly applied to the non-black display area NBA. Regarding the blower fan 22-2 associated with the LED 17-2 to be supplied, only those associated with the LED 17-2 adjacent to the LED 17-2 that can mainly supply light to the black display area BA. It is possible to adopt a drive method in which the other is not operated. It should be noted that the same driving method as described above can also be adopted when the non-black display area NBA includes the dark part DA and the bright part LA. In this way, since the blower fan 22-2 to be operated can be minimized, it is preferable for reducing power consumption. The above-described configuration is preferably combined with the configuration described in Embodiment 6, that is, the configuration in which the hole edge of each insertion hole is individually displaced with respect to each LED.

(3) In each of the above-described embodiments, the fan driving unit is connected to the image signal processing unit and the blower fan is driven based on the signal supplied from the image signal processing unit. What connected the part to the LED drive part and driven the blower fan based on the signal supplied from the LED drive part is also included in the present invention.

(4) In each of the above-described embodiments, the LED driving unit drives the LED and the fan driving unit drives the blower fan. However, the LED and the blower fan are driven by one integrated driving unit. It is also possible. Even in that case, it is preferable that the integrated drive unit is configured to receive the signal from the image signal processing unit and drive the LED and the blower fan.

(5) In each of the above-described embodiments, the fan driving unit is configured to receive the signal from the image signal processing unit and drive the blower fan. For example, the amount of light emitted from each LED in the liquid crystal display device An illuminance sensor to detect or a heat sensor to detect the amount of heat generated from each LED may be connected to the fan control unit, and each blower fan associated with each LED may be driven according to the detected value. Absent.

(6) In each of the above-described embodiments, one blower fan is configured to be driven in association with four LEDs or one LED. However, two, three, or five blower fans are provided. It can also be set as the structure driven corresponding to the above LED.

(7) In each of the above-described embodiments, the blower fan is intermittently arranged in the region between the LEDs in the X-axis direction, and the LEDs located at positions other than both ends in the Y-axis direction are included in two LED groups. However, it is also possible to arrange the blower fans in the region between the LEDs in the X-axis direction and to include the LEDs in four or two LED groups. .

(8) In the above-described embodiments, the blower fans are individually driven. However, the present invention includes a fan that is driven for each of the plurality of blower fans.

(9) In each of the above-described embodiments, the blower fan is arranged at the central position of the LED group. However, the present invention includes an arrangement in which the blower fan is unevenly distributed from the central position of the LED group. In addition, the present invention includes an arrangement in which the blower fan overlaps with any of the LEDs included in the LED group in plan view.

(10) In addition to the above-described embodiments, the number, arrangement, and shape of the chassis vents and board vents can be changed as appropriate. For example, as a modification of the first and fifth embodiments described above, the number of chassis vent holes and board vent holes may be an odd number instead of an even number. In addition, as a modification of the above-described fourth embodiment, the chassis vent hole and the substrate vent hole are arranged at a position away from the hole edge of the insertion hole in the reflection sheet and at a position other than the intermediate position between the adjacent insertion holes. It doesn't matter. Further, as a modification of the above-described fourth embodiment, when the chassis vent holes and the substrate vent holes are arranged at positions away from the hole edges of the insertion holes in the reflection sheet, it is possible to change the number of installation.

(11) In each of the above-described embodiments, all LEDs are mounted on one LED board. However, the LED board is divided into a plurality of parts, and a plurality of LEDs are mounted on each of the divided LED boards. A configuration is also possible. In that case, it is set as the structure (structure used as a strip-shaped division | segmentation LED board) which arrange | positions several LED in parallel with respect to a division | segmentation LED board, or arrange | positions a plurality of LED in parallel with a division | segmentation LED board at a matrix form. A configuration is also possible. In any configuration, it is preferable to arrange a plurality of divided LED substrates in parallel in a matrix in the chassis in order to increase the size of the backlight device (liquid crystal display device).

(12) In the above-described sixth embodiment, the configuration in which the slits and the four pieces are formed is shown, but the number, arrangement, shape, and the like of the slits and the pieces can be appropriately changed.

(13) In each of the above-described embodiments, each LED is driven by PWM dimming, but each LED may be driven by other methods.

(14) In each of the embodiments described above, the LED substrate is shown in which the diffusion lens is installed so as to cover the LED, but the configuration in which the diffusion lens is removed is also included in the present invention. In that case, what is necessary is just to make it provide the LED insertion hole (light source insertion hole) of the magnitude | size which penetrates only LED in a reflective sheet. And the light emission range of LED can be controlled by displacing a reflective sheet with a ventilation fan so that the hole edge of the LED penetration hole in a reflective sheet may overlap with the emission path | route of the light emitted from LED.

(15) In each of the embodiments described above, the reflection sheet laid in the chassis is used to regulate the light output range of the diffusing lens. However, in addition to the reflection sheet, a flexible sheet shape is used. By disposing the member in the chassis, the light emission range of the diffusing lens is regulated.

(16) In the above-described embodiments, the blower fan is disposed outside the chassis. However, the present invention includes a blower fan disposed in the chassis.

(17) In each of the above-described embodiments, the case where the blower fan is used as the “blower” that blows air to the reflection sheet is exemplified, but a blower that does not have a fan that blows by rotating is used. Is also possible.

(18) In each of the above-described embodiments, the case where an LED is used as a light source has been described. However, other types of light sources such as a cold cathode tube, a hot cathode tube, and an organic EL can also be used.

(19) In each of the above-described embodiments, the direct type backlight device has been exemplified. However, the light source is arranged along the outer edge of the liquid crystal panel, and the light from the light source is disposed by the light guide member disposed directly under the back surface of the liquid crystal panel. The present invention can also be applied to a so-called edge light type backlight device that guides light toward a liquid crystal panel.

(20) In each of the above-described embodiments, the liquid crystal panel is illustrated in a vertically placed state in which the short side direction coincides with the vertical direction, but the liquid crystal panel matches the long side direction with the vertical direction. What is set in a vertical state is also included in the present invention.

(21) In each of the above-described embodiments, the liquid crystal display device used for the television receiver has been exemplified. However, the liquid crystal display device may be applied to other uses such as an advertising display in which the display image does not change for a certain period of time. Particularly preferred.

(22) In each of the embodiments described above, a TFT is used as a switching element of a liquid crystal display device. In addition to the liquid crystal display device for display, the present invention can also be applied to a liquid crystal display device for monochrome display.

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

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

DESCRIPTION OF SYMBOLS 10 ... Liquid crystal display device (display device), 11 ... Liquid crystal panel (display panel), 12 ... Backlight device (illumination device), 14 ... Chassis, 14e ... Chassis vent, 17 ... LED (light source), 18 ... LED board (Light source substrate), 18a ... substrate vent, 21 ... reflective sheet (movable light output restricting portion, reflecting member), 21d ... insertion hole (light source insertion hole), 22 ... fan (fan), 31 ... image signal processor 32 ... Liquid crystal panel control unit (display panel control unit), 33 ... LED drive unit (light source drive unit), 34 ... Fan drive unit (fan drive unit), TV ... TV receiver

Claims

Multiple light sources;
The light source has a sheet shape extending in a region extending over a plurality of the light sources and has a light source insertion hole through which the light source passes, and at least a hole edge of the light source insertion hole is displaced relative to the light source. A movable light emission regulating unit capable of regulating the light emission range of
An air blower capable of changing a relative positional relationship of the movable light output restricting unit with respect to the light source by blowing air to the movable light output restricting unit and including a plurality of light sources having different light emission ranges; Lighting device.
The illuminating device according to claim 1, wherein the air blowing unit can dissipate heat from the light source by blowing air around the light source or the light source.
Whereas the light source and the movable light output regulating part are accommodated inside, the outside is provided with a chassis to which the air blowing part is attached,
3. The lighting device according to claim 1, wherein a chassis vent hole that opens toward the movable light output restricting portion and allows ventilation from the air blowing portion is formed in the chassis.
A plurality of the light sources are mounted and a light source board accommodated in the chassis is provided,
The lighting device according to claim 3, wherein the light source substrate is formed with a substrate air hole that opens toward the movable light output restricting portion and communicates with the chassis air hole.
The lighting device according to claim 4, wherein the chassis vent hole and the substrate vent hole are arranged at positions that open toward a hole edge of the light source insertion hole in the movable light output restricting portion.
The lighting device according to any one of claims 1 to 5, wherein the movable light output restricting portion is a reflecting member that reflects light from the light source.
The illuminating device according to any one of claims 1 to 6, wherein the blower unit is configured by a blower fan that is rotatable in both forward and reverse directions.
A plurality of the air blowing units are arranged at positions corresponding to the arrangement of the plurality of light sources, and a light source driving unit that drives the plurality of light sources, and an air blowing drive that drives the air blowing unit associated with the light sources. The illuminating device of any one of Claim 1 to 7 provided with a part.
The light source driving unit drives the plurality of light sources so that a relatively bright light source and a relatively dark light source are included, whereas the blower driving unit is configured such that the movable light output regulating unit is at least relative to the light source driving unit. The illuminating device according to claim 8, wherein the air blowing unit is driven so as to regulate a light output range of the relatively bright light source adjacent to a dark light source.
The light source driving unit drives the plurality of light sources so that a plurality of relatively bright light sources and a plurality of relatively dark light sources are included. The illumination according to claim 9, wherein the blower unit is driven so as to regulate a light output range for a plurality of the relatively dark light sources in addition to the relatively bright light source adjacent to the relatively dark light source. apparatus.
The lighting device according to claim 10, wherein the air blowing drive unit drives the plurality of air blowing units in association with a plurality of light source groups each including the light sources.
A display device comprising: the illumination device according to any one of claims 1 to 11; and a display panel that displays an image using light from the illumination device.
An image signal processing unit that processes a signal related to the image, a display panel control unit that controls driving of the display panel based on an output signal from the image signal processing unit, and an output signal from the image signal processing unit The light source drive part which drives the said some light source based on the base, and the ventilation drive part which drives the said ventilation part matched with the said light source based on the output signal from the said image signal process part of Claim 12 Display device.
15. The display device according to claim 13, wherein the display panel is a liquid crystal panel in which liquid crystal is sealed between a pair of substrates.
A television receiver comprising the display device according to any one of claims 12 to 14.