JP4560650B2 - Backlight unit - Google Patents

Description

  The present invention relates to a backlight unit incorporated in a field sequential type color liquid crystal display device.

  A color liquid crystal display can consume much less power than a conventional display using a cathode ray tube or the like, and can make the entire display thinner and lighter. For this reason, the application has been expanded especially for displays that require a large display area. However, in a liquid crystal display, a backlight is used to increase the display brightness, and illumination light is transmitted from the back of the liquid crystal display panel. There is a need.

  As an example of such a backlight, a field sequential type liquid crystal display device in which an organic EL element is arranged through a light diffusion member in which light diffusion particles are dispersed in a liquid cooling medium behind a liquid crystal display panel is patented. It is disclosed in Document 1. By using the organic EL element, the display can be remarkably thinned.

  Further, Patent Document 2 discloses a backlight unit in which a large number of LEDs are arranged behind a liquid crystal display panel via a diffusion plate at a predetermined interval. Furthermore, as a backlight light source incorporated in the field sequential type liquid crystal display device, linear light sources emitting red light, green light and blue light are respectively incorporated at equal intervals on the outer peripheral surface of the rotating body, and this is incorporated into the liquid crystal display panel. Japanese Patent Application Laid-Open No. H10-228707 discloses a liquid crystal display panel that is disposed on the side of a light guide plate disposed directly below or disposed directly below a liquid crystal display panel without using a light guide plate.

  Since the liquid crystal display has a slower response speed of the liquid crystal compared to a cathode ray tube or the like, it is necessary to drive the liquid crystal by a field sequential method, particularly when displaying a moving image or the like, and to overcome the drawbacks related to the response speed.

JP 2001-290146 A JP 2003-207780 A JP 2004-055563 A

  Since the liquid crystal display device disclosed in Patent Document 1 uses an organic EL element that generates a large amount of heat as a backlight light source, it must be cooled by circulating the cooling medium of the light diffusing member, which is cumbersome to handle. In combination with the use of a liquid, there is a disadvantage that the cost for that is increased. Moreover, it is practically difficult to use it as a high-luminance backlight light source with the current technology, and it has hardly been put into practical use.

  The backlight unit disclosed in Patent Document 2 must be dotted with a large number of LEDs over a region substantially equal to the liquid crystal display panel, and the substrate on which the LEDs are mounted has an area substantially equal to that of the liquid crystal display panel. It is necessary to arrange them in a row. In addition, if the distance between the back surface of the liquid crystal display panel and the LED is not increased to some extent, it is difficult to make the luminance distribution of light on the liquid crystal display surface uniform, so that the display cannot be made too thin.

  The backlight disclosed in Patent Document 3 requires power for rotationally driving the rotating body, and uses a fluorescent tube as a linear light source. Have. In addition, it is necessary to increase the diameter of the rotating body so that light from the three linear light sources attached to the rotating body does not mix, and to increase the circumferential interval between the two adjacent linear light sources, As in the case of Patent Document 2, the display cannot be made so thin.

  By the way, when an analog television image is displayed on a liquid crystal, the image for one frame is separated into three primary colors, for example, the red image for one frame is first scanned and displayed, and then the green image for the same frame is scanned and displayed. Finally, it is necessary to scan and display a blue image. In this case, when the next color scan display is performed during the scan display of a specific color by the field sequential method, a plurality of colors of light are simultaneously irradiated on the same screen, and the preceding image and the subsequent image are followed. There is a problem that color mixing occurs between the images and the sharpness of the displayed image is lowered. For this reason, when an image of an analog television or the like is displayed on a liquid crystal, it is substantially difficult to display an image of the next color until the display of a specific color in one frame image is completed, and a high-speed moving image is displayed. Could not be displayed clearly.

The present invention is a backlight unit (10) incorporated in a field-sequential color liquid crystal display device, which is opposed to each other in the first direction with a pair of partitions each having a light reflecting surface. A housing (11) formed between the wall (11b) and the pair of partition walls (11b ) and having an elongated rectangular opening (13) along a second direction intersecting the first direction; The housing (11) is attached to at least one end portion along the second direction, and emits red light, green light, and blue light toward the other end portion along the second direction of the housing (11). at least three light sources respectively emitting (15), a reflecting surface for reflecting the opening (13) of said light emitted from said light source (15) mounted on said housing (11) housing (11) Have And Furekuta (16, 17), comprising a frame (12) for holding in alignment along a plurality of said housing (11) in said first direction, said reflector (16,17), said light source (15 ) And the reflected light from the first reflector (16) is guided and positioned between the pair of partition walls (11b) of the housing (11). 11) and the second reflector (17) facing the opening (13), and the distance between the second reflector (17) and the opening (13) of the housing (11) can be adjusted. It is characterized by further comprising adjusting means (20, 23) .

  In the present invention, light emitted from the light sources of the individual housings along the second direction is incident on the liquid crystal display panel directly or indirectly through the reflector from the opening of the housing. It becomes transmitted illumination light. These housings are arranged along a first direction, and a red image, a blue image, and a green image are fed in a feed sequential manner from a housing located on one end side in the first direction to a housing located on the other end side. The three lights are turned on in order according to the. When attention is paid to any one housing, high-speed moving image display is substantially achieved by sequentially lighting three lights according to the response speed of the liquid crystal shutter. In this case, since each housing is partitioned with respect to the adjacent housing, even if the illumination light of one housing is different from the illumination light of the other housing, color mixing of images occurs between them. Absent.

  The backlight unit of the present invention may further include a light deflection adjusting plate for collectively covering the openings of the individual housings and adjusting the light emission state from these openings to a desired characteristic. In this case, a gap can be formed between the tip surfaces of the pair of partition walls of the housing and the light deflection adjusting plate.

Second reflector, as narrows the distance between the opening of the housing with distance from the light source may be one that is inclined in the second direction. Alternatively, the second reflector is not good be one having a plurality of light deflecting portion of the inclined surface for reflecting on the opening side of the housing the light having each from a light source is projected on the surface.

  The light source may be turned on sequentially for each individual housing in a field sequential manner.

According to the backlight unit of the present invention, a pair of partition walls facing each other in the first direction and having opposing surfaces as light reflecting surfaces are formed between the pair of partition walls. A housing having an elongated rectangular opening along a second direction intersecting the direction, and at least one end portion along the second direction of the housing, and the other end along the second direction of the housing At least three light sources that respectively emit red light, green light, and blue light toward the part; a reflector that is attached to the housing and has a reflecting surface that reflects the light emitted from the light source toward the opening of the housing; Since the display frame is provided with a frame that holds the housing in alignment in the first direction, the display can be designed to be relatively thin. It can be obtained relatively high intensity illumination light at even a small number of light sources. In addition, when the light sources are sequentially turned on for each of these housings in a field sequential manner, each housing is partitioned with respect to the adjacent housing, so that the illumination light of one housing and the illumination light of the other housing are Even if they are different, it is possible to avoid color mixing of images between them, and to realize high-speed moving image display comparable to a display with a high display speed using a cathode ray tube or the like with high definition. Further, the reflector includes a first reflector that sandwiches the light source, and a second reflector that guides reflected light from the first reflector and is positioned between the pair of partition walls of the housing and faces the opening of the housing. Thus, the first reflector can direct the light more strongly in the second direction, and the amount of light emitted from the opening located far from the light source can be increased. In addition, since the adjustment means that can adjust the distance between the second reflector and the opening of the housing is provided, it is possible to further finely adjust the luminance distribution and directivity of the light emitted from the opening.

  When the light deflection adjusting plate for covering the openings of individual housings at once and adjusting the light emission state from these openings to desired characteristics is further provided, the luminance distribution and directivity are optimally adjusted. be able to. In particular, when a gap is formed between the front end surfaces of the pair of partition walls of the housing and the light deflection adjusting plate, bright lines generated by reflection from the partition walls of adjacent housings can be suppressed, and the luminance distribution can be reduced. It is possible to make it more uniform.

Second reflector, so narrowed gap between the opening of the housing with distance light source or, et al., If you are inclined along the second direction, effect coupled with the first reflector The luminance distribution of light from the opening can be made more uniform. Second reflector, it is possible to obtain a similar effect even if they have a large number of optical deflecting unit light having each an inclined surface for reflecting on the opening side of the housing from the light source is projected on the surface .

  When the light source is turned on sequentially for each housing in a field sequential manner, the illumination light of one housing and the illumination light of the other housing are different because each housing is partitioned with respect to the adjacent housing. Even so, it is possible to avoid color mixing of the images between them, and to realize high-speed moving image display comparable to a display having a high display speed using a cathode ray tube or the like with high definition.

  Embodiments of a backlight unit according to the present invention will be described in detail with reference to FIG. 1 to FIG. 7, but the present invention is not limited to such embodiments, and the scope of the present invention described in the claims is described below. Any change or modification encompassed by the concept is possible, and of course can be applied to any other technique belonging to the spirit of the present invention.

  The appearance of the backlight unit in this embodiment is shown in FIG. 1 in an exploded state, its planar shape is shown in FIG. 2 in a partially broken state, and the cross-sectional shape taken along the line III-III in FIG. FIG. 4 is an enlarged view of the left half, and FIG. 5 shows a cross-sectional shape taken along line VV in FIG. That is, the backlight unit 10 in the present embodiment includes a plurality of (in the present embodiment, ten) housings 11, a frame 12 that holds the housings 11 in alignment in the first direction, and the individual housings 11. And a light deflection adjusting plate 14 for adjusting the light emission state from the openings 13 to a desired characteristic.

  Each of the housings 11 is opposed to the elongated bottom plate portion 11a along the second direction intersecting the first direction, and spaced apart in the first direction with the bottom plate portion 11a interposed therebetween. Each has a pair of partition walls 11b each serving as a light reflecting surface, and a pair of side walls 11c facing each other in the second direction intersecting the first direction across the bottom plate portion 11a. The openings 13 of the housing 11 are formed on the opposite side of the bottom plate portion 11a in a state surrounded by the pair of partition walls 11b and the side walls 11c described above. The bottom plate portion 11a and the pair of side walls 11c can be integrally formed by sheet metal press molding, but the pair of partition walls 11b are formed of a material that is as thin as possible, for example, aluminum foil or paper. It is preferable. From such a viewpoint, it is also effective to omit one of the partition walls 11b of the adjacent housing 11. The number of housings 11 needs to be set based on the number of time divisions according to the size of an image of one frame and the response speed of the liquid crystal display panel to be used.

  The pair of side walls 11c of each housing 11 has at least three LEDs 15 each emitting red light, green light, and blue light toward the opposite side wall 11c (first set of six in the illustrated example). It is being fixed at equal intervals along the direction. When the length of the housing 11 along the second direction is relatively short with respect to the light quantity of these LEDs 15, it is possible to provide the LED 15 only on one side wall 11c side. In order to increase, it is effective to arrange the LEDs 15 on both side walls 11c as in the present embodiment. In addition to at least three pairs of LEDs 15 that respectively emit red light, green light, and blue light, adding white LEDs that emit white light is also effective in increasing the amount of emitted light. Moreover, when the emitted light quantity of LED15 of each color is not uniform, since commercially available green LED is generally inferior in luminance and light quantity compared with red LED and blue LED, the number of LEDs 15 of each color is not the same. For example, it is possible to set the number of green LEDs more than the number of red LEDs and blue LEDs so that every other green LED is arranged, that is, the green LEDs are always located between the red LEDs and the blue LEDs. preferable.

  A first reflector 16 formed by bending a plate material in a U shape is attached to the pair of side walls 11c so as to sandwich the LEDs 15 between the bottom plate portion 11a side and the opening portion 13 side, and each LED 15 is formed by a reflection surface formed on the inside. The light emitted from the light is guided to the opposite side wall 11c. Further, the reflected light from the first reflector 16 is guided on the bottom plate portion 11a, and the central portion is lifted from the bottom plate portion 11a so that the distance from the opening 13 of the housing 11 becomes narrower as the distance from the LED 15 increases. A second reflector 17 is provided. In this way, the first reflector 16 sandwiching the LED 15 and the second reflector 17 having a reflecting surface facing the opening 13 are respectively positioned between the pair of partition walls 11b of the housing 11, and the inner surface of the partition wall 11b. The light emitted from the LED 15 is reflected toward the opening 13 of the housing 11 by the reflecting surface formed on the housing 11.

  The first reflector 16 in the present embodiment is located on the opening 13 side of the housing 11 and is an opening that is inclined so that the distance from the opening 13 of the housing 11 decreases as the distance from the LED 15 increases along the second direction. The second-reflector-side reflecting surface 16a and the second-reflector-side reflecting surface that is located on the second reflector 17 side and is inclined so that the distance from the opening 13 of the housing 11 increases as the distance from the LED 15 increases along the second direction. 16b. The opening side reflecting surface 16a whose length along the second direction is shorter (preferably less than half) than the second reflector side reflecting surface 16b mainly directs light from the LED 15 to the second reflector side reflecting surface 16b side. The second reflector-side reflecting surface 16b that has a function of reflecting and has a tip that overlaps the end portion of the second reflector 17 in a close state mainly emits direct light from the LED 15 and reflected light from the opening-side reflecting surface 16a. It has a function of reflecting toward the reflector 17 side. Due to the presence of the first reflector 16, direct light from the LED 15 can be prevented from entering the opening 13 of the housing 11 through the light deflection adjusting plate 14, and the luminance in the vicinity of the opening 13 adjacent to the LED 15. Unevenness can be eliminated and more uniform light distribution characteristics can be obtained.

  In addition, the shape of the opening side reflection surface 16a and the second reflector side reflection surface 16b is not limited to this embodiment, and can be appropriately changed according to the light emission characteristics of the LED 15 used. Needless to say.

  In the present embodiment, a large number of light deflecting units are formed on the reflecting surface of the second reflector 17 so that the light reaching the light deflection adjusting plate 14 is uniformly distributed over the entire area of the light deflection adjusting plate 14 as much as possible. Each of the light deflectors 18 has an inclined surface that reflects the light from the LED 15 toward the opening 13. These light deflectors 18 are set so that the density distribution becomes higher toward the reflecting surface side of the second reflector 17 that is farther from the LED 15, that is, toward the center side. It is possible to adopt what is described in 35824 gazette etc. It is also possible to form these light deflection portions 18 on the opening-side reflecting surface 16a and the second reflector-side reflecting surface 16b of the first reflector 16 described above.

  At the center portion of the second reflector 17 formed by molding a plate material, the tip portions of a pair of push screws 20 screwed into the housing 11 from outside so as to penetrate the pair of nuts 19 joined to the bottom plate portion 11a. Is hitting. By changing the screwing amount of these push screws 20, it is possible to finely adjust the inclination angle of the second reflector 17 with respect to the optical axis of the LED 15 by changing the protruding amount of the center portion of the second reflector 17 from the bottom plate portion 11 a. It is like that. The end portion of the second reflector 17 is held by a fixing screw 21 that is screwed into the bottom plate portion 11a so that the second reflector 17 does not float from the bottom plate portion 11a. In the present embodiment, the fixing screw 21 formed at the end of the second reflector 17 is arranged so that the end of the second reflector 17 can slide along the surface of the bottom plate portion 11a in accordance with the screwing operation of the push screw 20. The penetrating portion is a long hole (notch) 22 along the first direction.

  Furthermore, the pulling with respect to the above-described push screw 20 can be adjusted more finely by changing the curvature of the first reflector 16 between the central portion and the end portion so that the reflection direction of the light from the light source 12 to the opening portion 11b can be finely adjusted. Similarly, the screw 23 is screwed into the nut 24 joined to the bottom plate portion 11 a from the outside of the housing 11, and the leading end portion of the pull screw 23 is an engaging portion 25 formed on the back surface of the first reflector 16. However, the connecting structure between the tip of the pull screw 23 and the first reflector 16 may be any structure that can realize a spherical pair.

  In the present embodiment, a pair of push screws 20 is provided for each housing 11 and one pull screw 23 is provided. However, the number of the push screws 20 and the pull screws 23 as the adjusting means of the present invention is the same as that of the present embodiment. It is not necessarily limited to these, and can be appropriately changed according to the width dimension of each housing 11 along the first direction.

  Although the LED 15 described above has advantages that it consumes less power and generates less heat than a cold-cathode tube and has a semi-permanent life, it is stable to radiate the LED 15 that is in a semi-sealed state in the housing 11. It is indispensable to guarantee the operation. Therefore, the frame 12 in the present embodiment that holds a large number of housings 11 includes a pair of chevron-shaped heat sinks 26 on which heat radiation fins 26a for radiating heat generated when the LEDs 15 of the individual housings 11 are radiated are formed, A pair of side plates 28 that connect the pair of heat sinks 26 via a plurality of screws 27, and a pair of cover plates that are respectively attached to the pair of heat sinks 26 and positioned above the first reflector 16 of each housing 11. 29. In the present embodiment, both end sides of the bottom plate portion 11a of the housing 11 are placed on the pair of heat radiating plates 26, and both end portions in the longitudinal direction (second direction) of the housing 11 are sandwiched between the cover plates 29. The side plate 28 prevents the housing 11 from coming off from the heat radiating plate 26 and the cover plate 29. Due to the presence of the heat radiating fins 26 a of the heat radiating plate 26, it is possible to efficiently radiate the heat generated with the lighting of the LED 15 to the outside of the housing 11.

  The light deflection adjusting plate 14 disposed so as to block the opening 13 of the housing 11 by the pair of cover plates 29 is used to finally adjust the directivity and luminance distribution of the backlight emitted from the light deflection adjusting plate 14. Alternatively, a so-called prism sheet in which irregularities (not shown) of a predetermined shape are regularly formed on the prism surface on the back surface, or a light diffusing plate formed on a rough surface with a satin surface on the front surface or the back surface, or each other It can be used by overlapping. In this embodiment, a known prism sheet is used, for example, so that the prism surface faces downward, but the two prism sheets can be stacked at right angles to form the light deflection adjusting plate 14. is there. A gap 30 is formed between the light deflection adjusting plate 14 and the front end of the partition wall 11b of the housing 11, so that the bright lines generated by the light reflected by the partition wall 11b are made inconspicuous.

  When the display area of the liquid crystal display device is increased, the central portion of the light deflection adjusting plate 14 having a relatively small thickness is bent, which may deteriorate the light distribution characteristics of the backlight with respect to the liquid crystal panel. For this reason, in this embodiment, the wedge-shaped support 31 is disposed immediately above the center portion of the first reflector 16, and the nut 32 joined to the bottom plate portion 11a at the center portion of the first reflector 16 is pushed from the outside of the housing 11. A screw 33 is screwed in, and a pin 33 a formed at the tip of the push screw 33 that passes through the first reflector 16 is rotatably fitted to the lower end of the support 31. That is, the central portion of the light deflection adjusting plate 14 is supported via the push screw 33 and the support 31, thereby maintaining the flatness of the light deflection adjusting plate 14. It is also effective to form the support 31 with an optically transparent resin such as an acrylic resin, or to provide the surface with reflectivity.

  Therefore, the direction of travel of the light from the LEDs 15 accommodated in each housing 11 is changed by the first reflector 16 and the second reflector 17 and the pair of partition walls 11b, and finally the light deflection is adjusted from the individual openings 13. Light exits through the plate 14. In this case, due to the presence of the light deflector 18 and the light deflection adjusting plate 14 formed on the reflecting surface of the second reflector 17, the direction of the emitted light is adjusted to a predetermined direction and the luminance distribution is made uniform. Become.

When such a backlight unit 10 is incorporated into a field sequential type color liquid crystal display device, a liquid crystal display panel (not shown) superimposed on the light deflection adjusting plate 14 converts a color image of one frame into a red image, a blue image, and a green image. decomposed image, because it is used simply as a liquid crystal shutter for opening and closing the pixels corresponding to these, high-speed response is possible OCB (O ptically C ompensated B irefringence ) can be used such as a liquid crystal, even high definition of pixels It becomes possible at the same time. Moreover, the driver etc. of each LED15 can be attached to the baseplate part 11a of the housing 11 using the space interposed between the heat radiating fins 26a, and there is no problem that impairs the thinning of the display.

  A timing chart of the liquid crystal display device in this embodiment is shown in FIG. That is, the LEDs 15 are sequentially turned on for each individual housing 11 in a field sequential manner in synchronization with the liquid crystal display panel, and these lighting times are set to 1.00 milliseconds. In this embodiment, a color image of one frame is generated every 16.67 milliseconds, and this is decomposed into a red image, a blue image, and a green image, and each image for each color is divided every 5.56 milliseconds. By dividing and sequentially driving the liquid crystal display panel in the area corresponding to each housing 11 by 0.556 milliseconds, it can be synthesized and displayed as a color image of one frame. That is, when focusing on one housing 11, the LED 15 that emits red light is turned on every 1.00 milliseconds every 16.67 milliseconds, and the LED 15 that emits green light 5.56 milliseconds later is 16.67 millimeters. The LED 15 that is turned on at a cycle of seconds is turned on every 1.00 milliseconds, and the LED 15 that emits blue light is turned on every 1.00 milliseconds at a cycle of 16.67 milliseconds. The liquid crystal display panel corresponding to the housing 11 is driven every 0.556 milliseconds with a period of 5.56 milliseconds, but there is a delay in the operation of the liquid crystal. On the other hand, the lighting timing of the corresponding LED 15 is delayed by a predetermined time (1 millisecond in this embodiment). In FIG. 6, the open signal of the liquid crystal gate pulse is always output every 5.56 milliseconds, but the opening degree of the liquid crystal shutter itself is controlled to be different depending on the magnitude of the image control signal. The

  In any case, the red light, green light, and blue light LEDs 15 are sequentially turned on every 5.56 milliseconds in one housing 11 in accordance with the response speed of the corresponding liquid crystal display panel. In the present embodiment, illumination lights of different colors are emitted simultaneously in a plurality of housings 11 at a certain time, but these illumination lights are mixed on the liquid crystal display panel side by the partition walls 11b of the individual housings 11. Therefore, an image with high definition can be formed.

  In the above-described embodiment, the first reflector 16 and the second reflector 17 are formed separately. However, the first and second reflectors 16 and 17 can be integrally formed continuously. FIG. 7 shows a schematic cross-sectional structure of the backlight unit 10 according to the present invention. Elements having the same functions as those of the previous embodiment are designated by the same reference numerals, and redundant descriptions are omitted. . That is, the reflector in this embodiment is formed by continuously forming the concave reflecting surfaces 34 having a predetermined radius of curvature adjacent to each other over the entire area of the first and second reflectors 16 and 17. Reduction and improvement of assembly workability can be planned. The size of these concave reflecting surfaces 34 is set to a size sufficiently larger than that of the previous light deflection unit 18.

  Such a reflector can be incorporated with the adjusting means as in the previous embodiment, and similarly, the light deflection section 18 described in the previous embodiment may be formed in an overlapping manner. It is also possible to randomly form the concave reflecting surface 34 with a predetermined distribution without forming it over the entire area of the first and second reflectors 16 and 17.

It is the stereographic projection figure showing the external appearance of one Embodiment of the backlight unit by this invention in a decomposition | disassembly state. It is the top view which fractured | ruptured a part of backlight unit shown in FIG. FIG. 3 is a cross-sectional view taken along arrow III-III in FIG. 2. It is an expanded sectional view of the left half of FIG. It is a VV arrow sectional view in FIG. 2 is a timing chart illustrating an example when the backlight unit illustrated in FIG. 1 is driven by a field sequential method. It is sectional drawing showing the structure of other embodiment of the backlight unit by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Backlight unit 11 Housing 11a Bottom plate part 11b Partition wall 11c Side wall 12 Frame 13 Opening part 14 Light deflection adjusting plate 15 LED
16 1st reflector 16a Opening part side reflecting surface 16b 2nd reflector side reflecting surface 17 2nd reflector 18 Light deflecting part 19 Nut 20 Push screw 21 Fixing screw 22 Long hole (notch)
23 Pull screw 24 Nut 25 Locking portion 26a Radiation fin 26 Radiation plate 27 Screw 28 Side plate 29 Cover plate 30 Gap 31 Support 32 Nut 33 Push screw 33a Pin 34 Concave reflection surface

Claims (6)

A backlight unit incorporated in a field sequential type color liquid crystal display device,
A pair of partition walls that face each other in the first direction and whose opposing surfaces are light reflecting surfaces, and a second direction that is formed between the pair of partition walls and intersects the first direction. A housing having an elongated rectangular opening along
At least three light sources that are attached to at least one end of the housing along the second direction and emit red light, blue light, and green light toward the other end of the housing along the second direction. A light source;
A reflector having a reflection surface attached to the housing and reflecting light emitted from the light source toward the opening of the housing;
A frame that holds the plurality of housings in alignment in the first direction, and the reflector is guided by a first reflector that sandwiches the light source, and reflected light from the first reflector, A second reflector located between the pair of partition walls of the housing and facing the opening of the housing;
The backlight unit further comprising an adjusting unit capable of adjusting an interval between the second reflector and the opening of the housing .   2. The light deflection adjusting plate according to claim 1, further comprising a light deflection adjusting plate for collectively covering the openings of the individual housings and adjusting the light emission state from the openings to a desired characteristic. Backlight unit.   The backlight unit according to claim 2, wherein a gap is formed between a front end surface of the pair of partition walls of the housing and the light deflection adjusting plate. Said second reflector, and the interval between the opening of the housing with distance from the light source is narrowed, according to claim 3 that claim 1, characterized in that inclined along the second direction The backlight unit according to any one of the above. It said second reflector, claim 1, characterized in that it comprises a plurality of light deflection unit which light having each an inclined surface for reflecting on the opening side of the housing from the light source is projected on the surface the backlight unit according to claim 4. The backlight unit according to any one of claims 1 to 5, wherein the light source is sequentially turned on for each of the housings in a field sequential manner.

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