JP2010238635A - Display device, and light source device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To control the occurrence of luminance unevenness in a light source device or the like arranged with a plurality of light emitting modules each having a light emitting portion. <P>SOLUTION: A light emitting device of the light source device includes a first light emitting module 40a to a fifth light emitting module 40e arranged from a bottom side toward a top side in a longitudinal direction and each having the light emitting portion emitting a light from the bottom side to the top side. In the light emitting device, the following relation is satisfied that a first LED number Na of the first light emitting module 40a>a second LED number Nb of the second light emitting module 40b>a third LED number Nc of the third light emitting module 40c>a fourth LED number Nd of the fourth light emitting module 40d>a fifth LED number Ne of the fifth light emitting module 40e. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a display device and a light source device that perform image display.

For example, in a display device such as a liquid crystal display device typified by a liquid crystal television or a liquid crystal monitor, a light emitting device called a backlight device is provided to emit light from the back surface of the display panel.
As this type of backlight device, for example, a so-called direct type in which a light source is arranged in a planar shape directly under (back) a display panel is known. This direct type backlight device is excellent in that high luminance can be secured, but the portion directly above the light source is likely to be brighter than the surroundings, and thus uneven luminance tends to occur. Further, in order to promote color mixing, it is necessary to secure a long optical path length from the light source to the irradiated object such as a display panel. Therefore, in the direct type backlight device, the thickness of the device tends to be thick.

  In addition, a light guide plate is provided on the back surface of the display panel, a light source is disposed on two or one side of the light guide plate, and the light incident from the side surface side of the light guide plate is provided by a reflective portion provided on the back side of the light guide plate. There is also known a so-called edge light type backlight device that reflects light to the side. Since this edge light type backlight device can easily secure the optical path length from the light source to the irradiated object such as the display panel, there is an advantage that the device can be made thinner than the direct type backlight device described above. . On the other hand, in the edge-light type backlight device, the light source is attached only to the side of the display panel. For example, in a large display device having a size of 40 inches or more, the amount of light decreases on the side far from the light source. Brightness unevenness is likely to occur.

  Furthermore, since the size of the light guide plate is determined by the size of the display panel, the size of the light guide plate must be increased as the display panel becomes larger. As the size of the light guide plate increases, new problems such as a decrease in the mechanical strength of the light guide plate or an increase in the weight of the light guide plate occur.

  As a prior art described in the publication, a light emitter that emits light in a direction substantially parallel to the display panel surface and a reflector that reflects the light emitted from the light emitter toward the display panel surface are set directly below the display panel. There is a technique in which a plurality of light emitting modules are arranged side by side so that the light emission directions are aligned (see Patent Document 1).

JP 2006-286539 A

  By the way, when the backlight device is configured as in Patent Document 1, for example, the light emitted from the light emitting module is mainly directed to the display panel side, but a part of the light is further located downstream in the emission direction. Proceed to the light emitting module side. Then, the region where the other light emitting modules located on the downstream side in the emission direction of the light emitting module are provided is the light emitted from the other light emitting modules provided on the downstream side in the emission direction to the upstream light emitting module. The light emitted at is added. As a result, the amount of light on the downstream side in the emission direction increases more than the amount of light on the upstream side in the emission direction, and there is a risk of uneven brightness in the planar light output from the backlight device.

  An object of the present invention is to suppress the occurrence of uneven brightness in a light source device or the like in which a plurality of light emitting modules each having a light emitting unit are arranged.

  The present invention is a display device that includes a display panel that displays an image, and a backlight device that is provided on the back surface of the display panel and emits light toward the display panel. A frame extending to the end side and deployed, and a plurality of light emitting elements arranged in the frame and arranged in a direction orthogonal to the direction from the one end side to the other end side, from one end side to the other end side A first light-emitting module having a first light-emitting portion that emits light; a first reflecting member that reflects light emitted from the first light-emitting portion toward the display panel; Light is emitted from one end side to the other end side using a plurality of light emitting elements arranged adjacent to the other end side of the light emitting module and arranged in a direction orthogonal to the direction from the one end side to the other end side. Second light emitting unit and second light emission And a second light emitting module having a second reflecting member that reflects the light emitted from the second light emitting unit toward the display panel, and the number of the plurality of light emitting elements in the second light emitting unit is the first light emitting unit. The number is set to be smaller than the number of the plurality of light emitting elements.

In such a display device, the backlight device further includes a diffusing member that diffuses the light emitted from the first light emitting module and the second light emitting module and enters without passing through the light guide plate and emits the light to the display panel side. It can be characterized by comprising.
Moreover, it can be further provided with the absorber which is provided in the edge part of the other end side of a flame | frame, and absorbs the light which injects from a 1st light emitting module and a 2nd light emitting module.

  From another point of view, the present invention is a display device that includes a display panel that displays an image, and a backlight device that is provided on the back surface of the display panel and emits light toward the display panel. The backlight device uses a frame extending from one end side to the other end side and a plurality of light emitting elements arranged on the frame and arranged in a direction perpendicular to the direction from the one end side to the other end side. A first light emitting unit that emits light from one end side toward the other end side, and a first reflecting member that reflects the light emitted from the first light emitting unit toward the display panel side. One end side using a light emitting module and a plurality of light emitting elements arranged in a frame adjacent to the other end side of the first light emitting module and arranged in a direction orthogonal to the direction from the one end side toward the other end side Emits light toward the other end A second light emitting module having a second light emitting unit and a second reflecting member that reflects the light emitted from the second light emitting unit toward the display panel, and a plurality of light emitting units in the second light emitting unit. The arrangement interval of the light emitting elements is set wider than the arrangement interval of the plurality of light emitting elements in the first light emitting portion.

  In such a display device, the plurality of light-emitting elements constituting the first light-emitting portion and the plurality of light-emitting elements constituting the second light-emitting portion may be light-emitting diodes.

  Furthermore, from another viewpoint, the light source device to which the present invention is applied extends from one end side to the other end side, and is deployed on the frame, and is directed from the one end side to the other end side. A first light-emitting unit that emits light from one end side to the other end side using a plurality of light-emitting elements arranged in a direction orthogonal to the first side, and the light emitted from the first light-emitting unit on the opposite side of the frame A first light emitting module having a first reflecting member that reflects toward the light source, and a frame that is disposed adjacent to the other end side of the first light emitting module on the frame, and is directed from one end side to the other end side. A second light emitting unit that emits light traveling from one end side to the other end side using a plurality of light emitting elements arranged in an orthogonal direction, and the light emitted from the second light emitting unit on the side opposite to the frame Second light emitting module having a second reflecting member that reflects toward the light source And a le, the number of the plurality of light-emitting elements in the second light emitting portion, is characterized by being set smaller than the number of the plurality of light-emitting elements in the first light-emitting portion.

In such a light source device, the arrangement interval of the plurality of light emitting elements in the second light emitting module can be set wider than the arrangement interval of the plurality of light emitting elements in the first light emitting unit.
Further, the light emitting device may further include a diffusing member that diffuses light emitted from the first light emitting module and the second light emitting module and enters without passing through the light guide plate and emits the light to the outside.

  According to the present invention, it is possible to suppress the occurrence of uneven brightness in a light source device or the like in which a plurality of light emitting modules each having a light emitting unit are arranged.

It is a figure which shows an example of the whole structure of the liquid crystal display device with which embodiment of this invention is applied. It is a figure which shows an example of a structure of a light source device. It is a perspective view for demonstrating an example of a structure of a light emitting module. (A) is a top view of a light emitting module, (b) is IVb-IVb sectional drawing of (a). It is a figure for demonstrating an example of a structure of a light emission unit. It is a figure for demonstrating an example of each light emission unit which comprises each light emission part in 1st light emission module (a)-5th light emission module (e), and its arrangement | sequence. It is a figure for demonstrating the behavior of the light in a 2nd light emitting module. It is a figure for demonstrating an example of the relationship between the light radiate | emitted from each of a 1st light emission module-a 5th light emission module, and the arrival area | region of the light in a diffusion plate. (A) is a top view of the other structural example of a light emitting module, (b) is IXb-IXb sectional drawing of (a).

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 is a diagram showing an example of the overall configuration of a liquid crystal display device to which the present embodiment is applied.
The liquid crystal display device includes a liquid crystal display module 20 and a backlight device 10 provided on the back side (lower side in the example shown in FIG. 1) of the liquid crystal display module 20. The liquid crystal display device is actually used in a standing state. In FIG. 1, the vertical direction V and the horizontal direction H when the liquid crystal display device is used are indicated by arrows. Yes. In addition, although the liquid crystal display device illustrated in FIG. 1 has a horizontally long shape that is larger in the horizontal direction H than in the vertical direction V, a configuration having a vertically long shape may be employed.

  The backlight device 10 includes a light source device 11 that irradiates light toward the liquid crystal display module 20 and an optical film having optical transparency with respect to visible light. A diffusing plate (plate or film) 12 as an example of a diffusing member that diffuses and scatters the light, and prism sheets 13 and 14 that are diffraction grating films having a forward light condensing effect. Further, the backlight device 10 is provided with a diffusion / reflection type brightness enhancement film 15 for improving the brightness, if necessary.

  On the other hand, the liquid crystal display module 20 is laminated on each glass substrate of the liquid crystal panel 21 as an example of a display panel configured by sandwiching liquid crystal between two glass substrates, and vibrates light waves. Polarizing plates 22 and 23 are provided for limiting in a predetermined direction. Furthermore, peripheral members such as a driving LSI (not shown) are also attached to the liquid crystal display module 20.

The liquid crystal panel 21 includes various components not shown. For example, two glass substrates are provided with a display electrode (not shown), an active element such as a thin film transistor (TFT), a liquid crystal, a spacer, a sealant, an alignment film, a common electrode, a protective film, a color filter, and the like. Yes.
The structural unit of the backlight device 10 is arbitrarily selected. For example, there may be a distribution form in which only the light source device 11 is called a “backlight device” and does not include the diffusion plate 12, the prism sheets 13 and 14, the brightness enhancement film 15, and the like.

  FIG. 2 is a view for explaining an example of the configuration of the light source device 11, and shows a top view of the light source device 11 as viewed from the upper side of FIG. In the present embodiment, a backlight structure is employed in which the light source device 11 is disposed immediately below the back surface of the liquid crystal display module 20. Note that the backlight device 10 according to the present embodiment does not include a so-called light guide plate (light guide).

  The light source device 11 includes a backlight frame 31 that opens toward the front side in the figure, a light emitting device 32 that is accommodated in the backlight frame 31 and emits light toward the front side in the figure, and an external power source (not shown). A power supply cable 33 that supplies power to the light emitting device 32 is provided.

  The backlight frame 31 has a housing structure formed of, for example, aluminum, magnesium, iron, or a metal alloy containing them. As such a housing structure, the backlight frame 31 is provided corresponding to the size of the liquid crystal display module 20 shown in FIG. 1 and extends in the vertical direction V and the horizontal direction H, and the front side from the back side. It protrudes toward the side, and has a side part that surrounds the four corners of the back part. And the white polyester film etc. are stuck on the inner side surface part of the housing | casing structure, for example, and it functions also as a reflector. Here, “extending in the vertical direction V” means that the back surface portion of the backlight frame 31 has a height in the vertical direction when the liquid crystal display device is erected.

  The light emitting device 32 includes a plurality of (five in the present embodiment) light emitting modules 40 (specifically, 40a to 40e) each extending in the horizontal direction H and arranged in the vertical direction V. ing. In the following description, these are referred to as a first light emitting module 40a, a second light emitting module 40b, a third light emitting module 40c, a fourth light emitting module 40d, and a fifth light emitting module 40e, respectively, as necessary. To do. As shown in FIG. 2, the first light emitting module 40a is located on the lowermost side (Bottom side) in the vertical direction V, and the fifth light emitting module 40e is located on the uppermost side (Top side) in the vertical direction V. The first light emitting module 40a, the second light emitting module 40b, the third light emitting module 40c, the fourth light emitting module 40d, and the fifth light emitting module 40e are arranged in this order from the bottom side to the top side. Further, in the present embodiment, each of the first light emitting module 40a to the fifth light emitting module 40e emits light from the bottom side to the top side, that is, the vertical direction V, and the light emitted from each is shown in the drawing. It is configured to reflect toward the front side. In this embodiment, “Bottom side” corresponds to one end side, and “Top side” corresponds to the other end side.

  The power supply cable 33 is configured by a flexible flat cable that can be folded, and is provided inside the backlight frame 31 and on the right side in the drawing. One end of the power supply cable 33 is a connector (not shown) for receiving power from the outside of the light source device 11, and the other end is a connector provided for each of the first light emitting module 40a to the fifth light emitting module 40e. 43, respectively.

  In addition, an absorber 35 is provided on the inner side of the top side of the backlight frame 31. The absorber 35 absorbs light incident on the top side end portion of the backlight frame 31 from the light emitting device 32. And this absorber 35 is comprised by attaching the plate-shaped member which exhibits black to the side surface inside the Top side of the backlight frame 31. As shown in FIG. In addition, you may form the absorber 35 by the coating using the coating material etc. which exhibit black, for example.

  Next, the configuration of the light emitting module 40 will be described. Here, first, a configuration common to the first light emitting module 40a to the fifth light emitting module 40e will be described as the light emitting module 40, and then, a unique configuration in each of the first light emitting module 40a to the fifth light emitting module 40e. I will explain.

FIG. 3 is a perspective view for explaining an example of the configuration of the light emitting module 40. 4A is a top view of the light emitting module 40 shown in FIG. 3, and FIG. 4B is a sectional view taken along line IVb-IVb of FIG. 4A.
The light emitting module 40 includes a plurality of light emitting diodes (referred to as LEDs in the following description) as an example of a plurality of light emitting elements arranged along the horizontal direction H, and is directed in the vertical direction V, that is, from the bottom side to the top side. A light emitting part 41 that emits light, a wiring board 42 that includes a wiring to which the light emitting part 41 is attached and supports the light emitting part 41 and that supplies power to the plurality of LEDs of the light emitting part 41, and a horizontal direction H of the wiring board 42 And a connector 43 that feeds power to the plurality of LEDs of the light emitting unit 41 via the wiring board 42.

  The light emitting module 40 is fixed to the top side of the light emitting unit 41 on the mounting surface side of the light emitting unit 41 in the wiring board 42, and the light emitted from the light emitting unit 41 is directed toward the diffusion plate 12 (see FIG. 1). A reflecting plate 44 that reflects and a light emitting module 40 that is formed on the top side of the reflecting plate 44 and is adjacent to the light emitting device 32 (see FIG. 2) (for example, the second light emitting module 40b in the case of the first light emitting module 40a). ) Provided on the light-emitting portion 41 toward the diffusion plate 12 (see FIG. 1), an adjustment member 45 that adjusts the amount of light transmitted, that is, the amount of light, and the horizontal direction H on the reflection plate 44 near the light-emitting portion 41. And an absorption portion 46 that absorbs part of the light incident from the light emitting portion 41.

  Among these, the light emitting unit 41 includes a plurality of light emitting units 50 arranged in a line along the horizontal direction H. Each light emitting unit 50 includes four LEDs arranged in a line along the horizontal direction H.

Further, the wiring board 42 is configured by so-called FPC (Flexible Printed Circuits), and an electrode exposed on one side of the wiring board and an electrode provided on each light emitting unit 50 are connected and fixed by solder. ing.
Further, the connector 43 is connected and fixed to the wiring board 42 by crimping or soldering.

  Moreover, the reflecting plate 44 is made of a white resin. As a material constituting the reflecting plate 44, for example, a PET (polyethylene terephthalate) resin containing titanium dioxide as a white pigment can be used.

  The reflecting plate 44 includes a rectangular first reflecting portion 44a and a rectangular second reflecting portion 44b that is inclined and extended from one long side of the first reflecting portion 44a. . Here, the first reflecting portion 44 a is arranged on the mounting surface side of the light emitting portion 41 of the wiring board 42 so that the long side is along the horizontal direction H on the top side of the light emitting portion 41. Moreover, the absorption part 46 mentioned above is attached to the 1st reflection part 44a. On the other hand, the second reflecting portion 44b is disposed so as to be inclined from the top-side end portion of the first reflecting portion 44a to the side blocking the path of the light emitted from the light emitting portion 41. That is, the second reflecting portion 44 b is formed so as to move away from the backlight frame 31 as the distance from the light emitting portion 41 increases. In the present embodiment, the angle θ formed by the extension line of the surface of the first reflecting portion 44a and the surface of the second reflecting portion 44b is set to be about 15 °. The angle θ is preferably selected from the range of 10 ° to 20 °.

  Further, the adjustment member 45 is made of a white resin, like the reflection plate 44. As a material constituting the adjusting member 45, for example, a material in which titanium dioxide is contained as a white pigment in a PET (polyethylene terephthalate) resin can be used.

  And the adjustment member 45 is arrange | positioned so that the long side may follow the horizontal direction H on the Top side rather than the 2nd reflection part 44b. Here, the upper surface of the adjustment member 45 is provided substantially parallel to the first reflecting portion 44a while forming a space below from the top side of the second reflecting portion 44b toward the top side.

The adjustment member 45 configured as described above is provided so as to cover the light emitting unit 41 of the adjacent light emitting module 40 when the light emitting device 32 is configured by arranging the first light emitting module 40a to the fifth light emitting module 40e. For example, as shown in FIG. 4B, the adjustment member 45 provided in the first light emitting module 40a is arranged so as to cover the light emitting portion 41 of the adjacent second light emitting module 40b on the diffusion plate 12 side. . Here, the adjustment member 45 is formed such that the thickness gradually decreases from the one end side 45a on the bottom side toward the other end side 45b on the top side. And the adjustment member 45 has the thickness which can adjust and permeate | transmit the light radiate | emitted from the light emission part 41 of the adjacent light emitting module 40 between the one end side 45a and the other end side 45b suitably.
In the present embodiment, the reflector 44 and the adjustment member 45 are integrated.

  The absorber 46 is provided on the bottom side of the light emitter 41 in the first reflector 44 a so that its long side is along the horizontal direction H. The absorption unit 46 is provided with a predetermined width from the vicinity of the light emitting unit 41 toward the light irradiation direction (from the bottom side to the top side). The absorbing portion 46 is formed by painting the first reflecting portion 44a with a gray paint or the like. In addition, it is preferable that the color which the absorption part 46 exhibits is N5 or more and N7 or less by the brightness (achromatic color) defined by the Munsell color system. The absorption unit 46 configured as described above absorbs a part of the light incident from the light emitting unit 41 and reflects the rest toward the diffusion plate 12 side. In addition, about the absorption part 46, the member which has the said structure other than the coating mentioned above may attach to the 1st reflection part 44a.

  FIG. 5 is a diagram for explaining an example of the configuration of the light emitting unit 50. Here, FIG. 5A shows a front view of the light emitting unit 50 as viewed from the top side, and FIG. 5B shows a side view of the light emitting unit 50.

  The light emitting unit 50 is formed in a rectangular shape, and includes four plate-like substrates 51 on which wiring (not shown) is formed, and four light-emitting units 50 that are mounted in a line on the top-side surface (referred to as a surface in the following description) of the plate-like substrate 51. LED52. In addition, the light emitting unit 50 includes a white resist film 53 formed on the surface side of the plate-like substrate 51 except for the periphery of the mounting position of each LED 52, and four LEDs 52 on the surface side of the plate-like substrate 51. And four lenses 54 for covering each of the above. The four LEDs 52 are, from the left side in FIG. 5A, a red LED 52R that emits red light, a first green LED 52Ga that emits green light, a blue LED 52B that emits blue light, and a second green LED 52Gb that emits green light. ing. With this arrangement, when the light emitting unit 41 (see FIG. 3) is configured by arranging a plurality of light emitting units 50 in a line, red, green, blue, green, red, green, blue, green, red, The LEDs 52 are arranged in this order. That is, red and blue are alternately arranged between every other green.

  FIG. 6 is a diagram for explaining an example of each light emitting unit 50 constituting each light emitting unit 41 and an arrangement thereof in the first light emitting module 40a to the fifth light emitting module 40e described above. 6A shows the first light emitting module 40a, FIG. 6B shows the second light emitting module 40b, FIG. 6C shows the third light emitting module 40c, and FIG. 6D shows the fourth light emitting module 40b. The light emitting module 40d is shown, and FIG. 6E shows the fifth light emitting module 40e.

  As shown in FIG. 6A, in each light emitting unit 50 constituting the first light emitting module 40a, the red LED 52R, the first green LED 52Ga, the blue LED 52B, and the second green LED 52Gb are arranged at the first interval La. Yes. Further, the adjacent second green LED 52Gb and the red LED 52R are similarly arranged at the first interval La at the boundary portion between the two adjacent light emitting units 50.

  Further, as shown in FIG. 6B, in each light emitting unit 50 constituting the second light emitting module 40b, the red LED 52R, the first green LED 52Ga, the blue LED 52B, and the second green LED 52Gb are more than the first interval La. They are arranged at a wide second interval Lb. Further, the adjacent second green LED 52Gb and red LED 52R are similarly arranged at the second interval Lb at the boundary between the two adjacent light emitting units 50.

  Further, as shown in FIG. 6C, in each light emitting unit 50 constituting the third light emitting module 40c, the red LED 52R, the first green LED 52Ga, the blue LED 52B, and the second green LED 52Gb are more than the second interval Lb. They are arranged at a wide third interval Lc. Further, the adjacent second green LED 52Gb and red LED 52R are similarly arranged at the third interval Lc at the boundary portion between the two adjacent light emitting units 50.

  Furthermore, as shown in FIG. 6 (d), in each light emitting unit 50 constituting the fourth light emitting module 40d, the red LED 52R, the first green LED 52Ga, the blue LED 52B, and the second green LED 52Gb are arranged at the third interval Lc. Are arranged at a wide fourth interval Ld. Further, the adjacent second green LED 52Gb and red LED 52R are similarly arranged at the fourth interval Ld at the boundary between the two adjacent light emitting units 50.

  As shown in FIG. 6E, in each light emitting unit 50 constituting the fifth light emitting module 40e, the red LED 52R, the first green LED 52Ga, the blue LED 52B, and the second green LED 52Gb are more than the fourth interval Ld. They are arranged at a wide fifth interval Le. Further, the adjacent second green LED 52Gb and red LED 52R are similarly arranged at the fifth interval Le at the boundary between the two adjacent light emitting units 50.

Thus, the first interval La to the fifth interval Le have the relationship of the first interval La <the second interval Lb <the third interval Lc <the fourth interval Ld <the fifth interval Le. is doing.
Therefore, when the light emitting device 32 shown in FIG. 2 is configured, the arrangement interval of the LEDs 52 is the most dense in the first light emitting module 40a that is the bottom side, that is, the most upstream side in the light emission direction from the light emitting unit 41. On the other hand, in the fifth light emitting module 40e on the most downstream side, the arrangement interval of the LEDs 52 is the coarsest.

  In the present embodiment, since the first light emitting module 40a to the fifth light emitting module 40e have the same lateral length, the number of LEDs 52 included in the light emitting unit 41 of the first light emitting module 40a is set to the first LED number Na. The number of LEDs 52 included in the light emitting unit 41 of the second light emitting module 40b is the second LED number Nb, the number of LEDs 52 included in the light emitting unit 41 of the third light emitting module 40c is the third LED number Nc, and the light emitting unit 41 of the fourth light emitting module 40d. When the number of LEDs 52 included in the light emitting unit 41 is the fourth LED number Nd and the number of LEDs 52 included in the light emitting unit 41 of the fifth light emitting module 40e is the fifth LED number Ne, these have a relationship of Na> Nb> Nc> Nd> Ne. Will be. Accordingly, the number of the light emitting units 50 included in the light emitting units 41 of the first light emitting module 40a is Ua, the number of the light emitting units 50 included in the light emitting units 41 of the second light emitting module 40b is Ub, and the light emitting units 41 of the third light emitting module 40c are included. When the number of the light emitting units 50 is Uc, the number of the light emitting units 50 included in the light emitting units 41 of the fourth light emitting module 40d is Ud, and the number of the light emitting units 50 included in the light emitting units 41 of the fifth light emitting module 40e is Ue. These have a relationship of Ua> Ub> Uc> Ud> Ue.

Next, the light emission operation of the backlight device 10 according to the present embodiment will be described with reference to FIGS.
Power is supplied from the power source (not shown) to the first light emitting module 40a to the fifth light emitting module 40e constituting the light emitting device 32 via the power supply cable 33. Then, for example, in the first light emitting module 40a, currents are respectively supplied to the red LED 52R, the first green LED 52Ga, the blue LED 52B, and the second green LED 52Gb provided in each light emitting unit 50 constituting the light emitting unit 41 via the wiring board 42. Flowing. As a result, red (R), green (G), and blue (B) light is emitted toward the Top side from the red LED 52R, the first green LED 52Ga, the blue LED 52B, and the second green LED 52Gb of each light emitting unit 50. .

  The RGB light emitted from each light emitting unit 50 toward the top side is mixed as it travels through the backlight frame 31 to become white light. The mixed white light is reflected by the reflection plate 44 and travels toward the diffusion plate 12 side. In the other second light emitting module 40b to fifth light emitting module 40e, white light emitted and mixed in the same procedure is directed toward the diffusion plate 12 side. The white light incident on the diffusion plate 12 is further mixed in color and made uniform in luminance by the diffusion plate 12, then passes through the prism sheets 13 and 14 and the luminance enhancement film 15 and is emitted toward the liquid crystal display module 20. Is done.

  In the backlight device 10 of the present embodiment, the light emitting units 41 provided in each of the first light emitting module 40a to the fifth light emitting module 40e are in a direction substantially parallel to the panel surface of the liquid crystal panel 21 of the liquid crystal display module 20. The light is emitted, and the reflection plate 44 provided in each of the first light emitting module 40 a to the fifth light emitting module 40 e reflects the light emitted from each light emitting unit 41 toward the liquid crystal panel 21. Thereby, in the 1st light emission module 40a-the 5th light emission module 40e, sufficient optical path length is ensured so that the light of each RGB color radiate | emitted from the light emission part 41 may be mixed. Therefore, for example, sufficient color mixing can be performed even if the distance between the light emitting unit 41 and the diffusing plate 12 is shortened, so that the backlight device 10 can be thinned.

FIG. 7 is a diagram for explaining the behavior of light in the second light emitting module 40b.
For convenience of explanation, of the light emitted from the light emitting unit 41 of the second light emitting module 40b, the light directed to the first reflecting unit 44a of the second light emitting module 40b is referred to as the first emitted light Bm1, the second light emitting module. The light directed to the second reflecting portion 44b of 40b is second emitted light Bm2, and the light directed to the adjusting member 45 of the first light emitting module 40a disposed adjacent to the bottom side of the second light emitting module 40b is third. The outgoing light Bm3 and the light traveling toward the absorption part 46 of the second light emitting module 40b are referred to as fourth outgoing light Bm4.
Here, the behavior of light in the second light emitting module 40b will be described, but the same applies to the other first light emitting modules 40a and the third light emitting module 40c to the fifth light emitting module 40e.

First, the behavior of the first outgoing light Bm1 and the second outgoing light Bm2 will be described.
As shown in FIG. 7, the first outgoing light Bm1 emitted from the light emitting unit 41 is reflected by the first reflecting unit 44a. At this time, a part of the first outgoing light Bm1 is diffusely reflected by the first reflecting portion 44a and travels toward the diffusion plate 12. Further, a part of the first outgoing light Bm1 is specularly reflected by the first reflecting portion 44a and travels toward the top side toward the diffusion plate 12.
Further, the second emitted light Bm2 emitted from the light emitting unit 41 is reflected by the second reflecting unit 44b. At this time, a part of the second outgoing light Bm2 is diffusely reflected by the second reflecting portion 44b and travels toward the diffusion plate 12. Part of the second outgoing light Bm2 is specularly reflected by the second reflecting portion 44b and travels toward the top side toward the diffusion plate 12.

Here, the light emitted from the LED 52 is diffused light. Due to the nature of the diffused light, the light emitting unit of the second light emitting module 40b is closer to the light emitting unit 41 (each light emitting unit 50), that is, the region on the Bottom side. On the side far from 41, that is, the top side, the light intensity is low. In the present embodiment, in consideration of the nature of the diffused light, the first reflecting portion 44a whose reflecting surface is substantially parallel to the optical axis direction of the light emitting portion 41 on the side close to the light emitting portion 41 of the reflecting plate 44. And the ratio of the amount of reflected light toward the diffuser 12 is reduced. On the other hand, a second reflecting portion 44b that is inclined with respect to the optical axis direction of the light emitting portion 41 is positioned on the side far from the light emitting portion 41 so as to increase the ratio of the amount of reflected light toward the diffuser plate 12.
By adopting such a configuration, the amount of light reflected by the reflector 44 is made uniform in each of the first light emitting module 40a to the fifth light emitting module 40e including the second light emitting module 40b.

Next, the behavior of the third emitted light Bm3 will be described.
As shown in FIG. 7, a part of the third emitted light Bm3 emitted from the light emitting unit 41 is absorbed or reflected by the adjusting member 45 of the first light emitting module 40a adjacent to the Bottom side. Of the third outgoing light Bm3, light that is not reflected by the adjustment member 45 and is not absorbed by the adjustment member 45 passes through the adjustment member 45 and travels toward the diffusion plate 12. Here, in the adjustment member 45, the one end side 45a close to the light emitting portion 41 is made thick so that the third emitted light Bm3 is hardly transmitted in the vicinity of the light emitting portion 41 having high light intensity. On the other hand, the adjustment member 45 transmits light so that the thickness of the other end side 45b far from the light emitting portion 41 is thinner than that of the one end side 45a, and the light intensity is reduced by moving away from the light emitting portion 41. It is easy to make it.

  Thereby, in each of the first light emitting module 40a to the fifth light emitting module 40e including the second light emitting module 40b, the adjustment member 45 is provided, so that the light amount near the upper part of the region where the light emitting unit 41 is provided is different from the other. It suppresses that it increases remarkably compared with the area. Further, the adjustment member 45 is configured so as not to absorb or reflect all the third outgoing light Bm3 emitted from the light emitting unit 41 and to block it. For this reason, in each of the first light emitting module 40a to the fifth light emitting module 40e including the second light emitting module 40b, by providing the adjusting member 45, the amount of light near the upper portion of the region where the adjusting member 45 is disposed is different. The situation of significantly less than the area of is avoided.

Next, the behavior of the fourth outgoing light Bm4 will be described.
As shown in FIG. 7, a part of the fourth emitted light Bm4 emitted from the light emitting unit 41 is absorbed by the absorbing unit 46. Further, a part of the fourth outgoing light Bm4 is reflected by the absorber 46 and travels toward the diffusion plate 12.
As described above, due to the nature of the diffused light, the amount of light in the vicinity of the light emitting unit 41 is larger than in other regions. Further, among the light emitted from the light emitting unit 41, the incident angle of the light that enters the side closer to the light emitting unit 41 in the first reflecting unit 44 a becomes smaller, so that the light regularly reflected by the first reflecting unit 44 a is reduced. The reflection angle is also reduced. Therefore, the light that is regularly reflected on the side near the light emitting unit 41 in the first reflecting unit 44a is likely to concentrate near the light emitting unit 41 in the diffuser plate 12, for example. Therefore, the amount of light near the upper part of the light emitting unit 41 is likely to increase as compared with other regions.

  On the other hand, in each of the first light emitting module 40a to the fifth light emitting module 40e including the second light emitting module 40b, by providing the absorbing portion 46 in the emission direction of the light emitting portion 41, that is, on the Top side and in the vicinity of the light emitting portion 41, The amount of light emitted from the light emitting unit 41 is adjusted and then reflected toward the diffusion plate 12 side. Thereby, it is suppressed that the light quantity of the just upper part of the light emission part 41 vicinity becomes large compared with another area | region. Furthermore, as described above, the absorption unit 46 is configured not to absorb all the fourth outgoing light Bm4 incident from the light emitting unit 41 but to reflect a part thereof. Therefore, in each of the first light emitting module 40a to the fifth light emitting module 40e including the second light emitting module 40b, the amount of light immediately above the region where the absorbing portion 46 is provided is significantly reduced compared to other regions. Suppressed.

  As described above, in the present embodiment, by devising the configuration of the first light emitting module 40a to the fifth light emitting module 40e, the luminance unevenness in the region immediately above the first light emitting module 40a to the fifth light emitting module 40e. We are trying to suppress it.

FIG. 8 is a diagram for explaining an example of the relationship between the light emitted from each of the first light emitting module 40 a to the fifth light emitting module 40 e and the light arrival region on the diffusion plate 12.
In the following description, in the diffusing plate 12, the region directly above the first light emitting module 40a is defined as the first region A1, and the region directly above the second light emitting module 40b is defined as the second region A2. The region directly above the light emitting module 40c is the third region A3, the region directly above the fourth light emitting module 40d is the fourth region A4, and the region directly above the fifth light emitting module 40e is the fifth region A5. Call.

  In the following description, the light output from the first light emitting module 40a is output from the first light L1, the light output from the second light emitting module 40b is output from the second light L2, and the third light emitting module 40c. The light output from the fourth light emitting module 40d is referred to as fourth light L4, and the light output from the fifth light emitting module 40e is referred to as fifth light L5.

  For example, the first light L1 emitted from the first light emitting module 40a is mainly the first main light LM1 directed to the first region A1 located immediately above the first light L1. A part of the first light L1 is in the first region A1. Instead, the first auxiliary light LS1 is directed to the second region A2 to the fifth region A5 on the top side, that is, on the downstream side in the emission direction. Further, for example, the second light L2 emitted from the second light emitting module 40b is mainly the second main light LM2 directed to the second region A2 located immediately above the second light L2 but a part thereof is Top. The second auxiliary light LS2 travels toward the third region A3 to the fifth region A5 on the side. Further, for example, the third light L3 emitted from the third light emitting module 40c is mainly the third main light LM3 directed to the third region A3 located immediately above the third light L3, but a part thereof is Top. The third auxiliary light LS3 is directed toward the fourth region A4 and the fifth region A5 that are on the side. Furthermore, for example, the fourth light L4 emitted from the fourth light emitting module 40d is mainly the fourth main light LM4 directed to the fourth region A4 located immediately above the fourth light L4. The fourth auxiliary light LS4 travels toward the fifth region A5 on the top side. For example, the light emitted from the fifth light-emitting module 40e is mainly the fifth main light LM5 directed to the fifth region A5 located immediately above the fifth light-emitting module 40e, and part of the light is on the top side. The fifth auxiliary light LS <b> 5 is directed to the inner side of the top side of the light frame 31.

  Further, not all of the light directed from each of the first light emitting module 40a to the fifth light emitting module 40e toward the diffusion plate 12 is incident on the diffusion plate 12, and a part of the light is reflected on the light emission device 32 side by the diffusion plate 12. The At this time, since the light emitting units 41 provided in each of the first light emitting module 40a to the fifth light emitting module 40e emit light from the bottom side to the top side, much of the reflected light from the diffusion plate 12 Goes from the Bottom side to the Top side.

  Therefore, the first region A1 is basically irradiated with the first main light LM1, whereas the second region A2 is added to the second main light LM2 from the bottom side in addition to the second main light LM2. A part of the incident first sub-light LS1 is also irradiated. In addition to the third main light LM3, the third region A3 is also irradiated with a part of the second sub-light LS2 and the first sub-light LS1 incident from the bottom side. Become. Further, in the fourth area A4, in addition to the fourth main light LM4, one of the third sub light LS3, the second sub light LS2, and the first sub light LS1 incident from the bottom side. The part will also be irradiated. Furthermore, in the fifth region A5, in addition to the fifth main light LM5, the fourth sub-light LS4, the third sub-light LS3, the second sub-light LS2, and the second sub-light LS2 that enter from the bottom side. A part of the first auxiliary light LS1 is irradiated.

  For this reason, even if the configuration of each of the first light emitting module 40a to the fifth light emitting module 40e is devised, when the backlight device 10 is configured using these, light is emitted on the Top side rather than the Bottom side. As a result, the amount of light on the Top side is likely to be larger than that on the Bottom side. As a result, the brightness on the Bottom side is lower than that on the Top side, and there is a risk of uneven brightness in the vertical direction V.

  On the other hand, in the present embodiment, as described with reference to FIG. 6, the arrangement interval in the horizontal direction H of the LEDs 52 in the first light emitting module 40a closest to the bottom side in the light emitting device 32 is set to the first interval La. By setting the number of LEDs 52 in the first light emitting module 40a as the first LED number Na, the arrangement interval in the horizontal direction H of the LEDs 52 in the second light emitting module 40b adjacent to the top side of the first light emitting module 40a is set to the first. By setting the second interval Lb wider than the one interval La, the number of LEDs 52 in the second light emitting module 40b is set to the second LED number Nb which is smaller than the first LED number Na. Further, the third light emission is achieved by setting the horizontal spacing H of the LEDs 52 in the third light emitting module 40c adjacent to the top side of the second light emitting module 40b to a third distance Lc wider than the second distance Lb. The number of LEDs 52 in the module 40c is set to a third LED number Nc that is smaller than the second LED number Nb. Furthermore, the fourth light emission is achieved by setting the horizontal spacing H of the LEDs 52 in the fourth light emitting module 40d adjacent to the top side of the third light emitting module 40c to a fourth distance Ld that is wider than the third distance Lc. The number of LEDs 52 in the module 40d is a fourth LED number Nd that is smaller than the third LED number Nc. Furthermore, the arrangement interval in the horizontal direction H of the LEDs 52 in the fifth light emitting module 40e that is adjacent to the top side of the fourth light emitting module 40d and is the top side is set to a fifth interval Le that is wider than the fourth interval Ld. Thus, the number of LEDs 52 in the fifth light emitting module 40e is set to a fifth LED number Ne that is smaller than the fourth LED number Nd.

  Thereby, the light quantity of the fifth light L5 output from the fifth light emitting module 40e is smaller than the light quantity of the fourth light L4 output from the fourth light emitting module 40d provided adjacent to the Bottom side, The amount of the fourth light L4 output by the four light emitting modules 40d is smaller than the amount of the third light L3 output by the third light emitting module 40c provided adjacent to the Bottom side. The light amount of the third light L3 output from the third light emitting module 40c is smaller than the light amount of the second light L2 output from the second light emitting module 40b provided adjacent to the Bottom side. The amount of the second light L2 output from the light emitting module 40b is smaller than the amount of the first light L1 output from the first light emitting module 40a provided adjacent to the Bottom side.

  As described above, from the bottom side to the top side, that is, from the first light emitting module 40a to the fifth light emitting module 40e along the light emission direction of the light emitting unit 41 in each of the first light emitting module 40a to the fifth light emitting module 40e. By gradually reducing the amount of emitted light, it is possible to suppress luminance unevenness caused by the accumulation of light on the Top side rather than the Bottom side.

  Here, in the example shown in FIG. 8, the light emitted from the first light emitting module 40 a to the fifth light emitting module 40 e and reaching the inner side of the top side of the backlight frame 31 is an absorber provided in this portion. 35 is absorbed. Therefore, it is possible to avoid a situation in which the amount of light at this portion increases and a bright line is generated in the region immediately above.

  In the present embodiment, the number of LEDs 52 provided in each of the first light emitting module 40a to the fifth light emitting module 40e satisfies the relationship of Na> Nb> Nc> Nd> Ne. It is not limited. In other words, at least the fourth light emitting module 40d and the fifth light emitting module 40e adjacent on the Top side only need to satisfy the relationship of Nd> Ne.

  In the present embodiment, the interval between the LEDs 52 provided in each of the first light emitting module 40a to the fifth light emitting module 40e satisfies the relationship La <Lb <Lc <Ld <Le. It is not limited to. In other words, at least the fourth light emitting module 40d and the fifth light emitting module 40e located on the top side only need to satisfy the relationship of Ld <Le.

  Furthermore, in the present embodiment, RGB light emitted from the red LED 52R, the first green LED 52Ga, the blue LED 52B, and the second green LED 52Gb is mixed to generate white light, but the present invention is not limited to this. . For example, an LED 52 that emits blue light is used, and a phosphor that converts blue light emitted from the LED 52 into green light and red light is contained in the lens 54 to generate white light. May be. Further, for example, an LED 52 that emits ultraviolet light is used, and a phosphor that converts ultraviolet light emitted from the LED 52 into blue light, green light, and red light is contained in the lens 54, thereby allowing white light to be emitted. You may comprise so that it may produce | generate.

Next, another configuration example of the light emitting unit 50 will be described.
9A shows a top view of the light emitting unit 50, and FIG. 9B shows a cross-sectional view taken along the line IXb-IXb in FIG. 9A.
As shown in FIGS. 9A and 9B, the light emitting unit 50 in this example has four LEDs 52 (a red LED 52R, a first green LED 52Ga, a blue LED 52B, and a second green LED 52Gb), and a recess 530. A resin case 510 that accommodates the four LEDs 52 inside the recess 530 is provided. Further, as shown in FIG. 9B, the light emitting unit 50 is further provided with a sealing resin 540 that is provided so as to fill the concave portion 530 of the resin case 510 and is transparent to the light emitted from the LED 52. . By providing the sealing resin 540, the four LEDs 52 arranged inside the recess 530 are protected from moisture, for example.

The light emitting unit 50 further includes a lead frame 520 held by the resin case 510. Each LED 52 is electrically and mechanically connected to the corresponding lead frame 520. Further, one end of the lead frame 520 protrudes outside the resin case 510. When the light emitting unit 50 is attached to the wiring board 42 shown in FIG. 3, the lead frame 520 and the wiring of the wiring board 42 are electrically and mechanically connected.
Each LED 52 emits light by causing a current to flow from the wiring board 42 to each LED 52 via the lead frame 520.

  In the first light-emitting module 40a to the fifth light-emitting module 40e shown in FIG. 2 and the like configured by using a plurality of such light-emitting units 50, the arrangement interval of the LEDs 52 in the light-emitting units 50 provided in the respective light-emitting units 50a is set to La <Lb < By setting Lc <Ld <Le, it is possible to suppress luminance unevenness caused by the accumulation of light on the Top side rather than the Bottom side. However, as described above, at least the fourth light emitting module 40d and the fifth light emitting module 40e located on the Top side only need to satisfy the relationship of Ld <Le.

  Further, by setting the number of LEDs 52 provided in each of the first light emitting module 40a to the fifth light emitting module 40e to Na> Nb> Nc> Nd> Ne, light is accumulated on the Top side rather than the Bottom side. It can be said that uneven brightness due to this can be suppressed. However, as described above, at least the fourth light emitting module 40d and the fifth light emitting module 40e adjacent on the Top side only need to satisfy the relationship of Nd> Ne.

DESCRIPTION OF SYMBOLS 10 ... Back light apparatus, 11 ... Light source device, 12 ... Diffusing plate, 13, 14 ... Prism sheet, 15 ... Brightness enhancement film, 20 ... Liquid crystal display module, 21 ... Liquid crystal panel, 22, 23 ... Polarizing plate, 31 ... Back Light frame, 32 ... light emitting device, 33 ... power feeding cable, 35 ... absorber, 40 ... light emitting module, 40a ... first light emitting module, 40b ... second light emitting module, 40c ... third light emitting module, 40d ... fourth light emitting module 40e ... fifth light emitting module, 41 ... light emitting part, 42 ... wiring board, 43 ... connector, 44 ... reflector, 45 ... adjusting member, 46 ... absorbing part, 50 ... light emitting unit, 51 ... plate-like substrate, 52 ... LED, 53 ... resist film, 54 ... lens

Claims (8)

A display device that includes a display panel that performs image display and a backlight device that is provided on the back surface of the display panel and emits light toward the display panel.
The backlight device includes:
A frame that extends from one end side to the other end side and is deployed;
A first light is emitted from the one end side toward the other end side using a plurality of light emitting elements arranged in the frame and arranged in a direction orthogonal to the direction from the one end side toward the other end side. A first light emitting module comprising: a light emitting unit; and a first reflecting member that reflects light emitted from the first light emitting unit toward the display panel;
Using the plurality of light emitting elements arranged in the frame so as to be adjacent to the other end side of the first light emitting module and arranged in a direction orthogonal to the direction from the one end side toward the other end side A second light emitting unit that emits light from one end side toward the other end side, and a second reflecting member that reflects the light emitted from the second light emitting unit toward the display panel. 2 light emitting modules,
The display device, wherein the number of the plurality of light emitting elements in the second light emitting unit is set to be smaller than the number of the plurality of light emitting elements in the first light emitting unit.   The backlight device further includes a diffusing member that diffuses light that is emitted from the first light emitting module and the second light emitting module and that is incident on the display panel without passing through a light guide plate. The display device according to claim 1, characterized in that:   The absorber further provided in the edge part of the said other end side of the said flame | frame, and absorbing the light which injects from the said 1st light emitting module and the said 2nd light emitting module. Display device. A display device that includes a display panel that performs image display and a backlight device that is provided on the back surface of the display panel and emits light toward the display panel.
The backlight device includes:
A frame that extends from one end side to the other end side and is deployed;
A first light is emitted from the one end side toward the other end side using a plurality of light emitting elements arranged in the frame and arranged in a direction orthogonal to the direction from the one end side toward the other end side. A first light emitting module comprising: a light emitting unit; and a first reflecting member that reflects light emitted from the first light emitting unit toward the display panel;
Using the plurality of light emitting elements arranged in the frame so as to be adjacent to the other end side of the first light emitting module and arranged in a direction orthogonal to the direction from the one end side toward the other end side A second light emitting unit that emits light from one end side toward the other end side, and a second reflecting member that reflects the light emitted from the second light emitting unit toward the display panel. 2 light emitting modules,
The display device, wherein an arrangement interval of the plurality of light emitting elements in the second light emitting unit is set wider than an arrangement interval of the plurality of light emitting elements in the first light emitting unit.   5. The display device according to claim 4, wherein the plurality of light emitting elements constituting the first light emitting unit and the plurality of light emitting elements constituting the second light emitting unit are light emitting diodes. A frame that extends from one end side to the other end side and is deployed;
A first light is emitted from the one end side toward the other end side using a plurality of light emitting elements arranged in the frame and arranged in a direction orthogonal to the direction from the one end side toward the other end side. A first light emitting module comprising: a light emitting unit; and a first reflecting member that reflects light emitted from the first light emitting unit toward a side opposite to the frame;
Using the plurality of light emitting elements arranged in the frame so as to be adjacent to the other end side of the first light emitting module and arranged in a direction orthogonal to the direction from the one end side toward the other end side A second light emitting unit that emits light traveling from one end side toward the other end side, and a second reflecting member that reflects the light emitted from the second light emitting unit toward the side opposite to the frame; A second light emitting module having
The light source device, wherein the number of the plurality of light emitting elements in the second light emitting unit is set to be smaller than the number of the plurality of light emitting elements in the first light emitting unit.   The light source device according to claim 6, wherein an arrangement interval of the plurality of light emitting elements in the second light emitting module is set wider than an arrangement interval of the plurality of light emitting elements in the first light emitting unit.   The diffusion member which diffuses the light radiate | emitted from the said 1st light emitting module and the said 2nd light emitting module, and enters without passing through a light-guide plate, and is radiate | emitted outside is further provided. Light source device.

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