JP2008186802A - Backlight device, and liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a backlight device capable of restraining generation of color unevenness on a light guide plate. <P>SOLUTION: The backlight device 20 includes a plurality of LED packages 32, and a light guide plate 22. Each LED package 32 is provided with a third housing 33, a red LED 34, a blue LED 35 and a green LED 36. The LEDs 34, 35, 36 are housed inside the third housing 33 and arranged at a bottom wall part 26 of the third housing 33. At least a part of arrangement of the LEDs 34, 35, 36 against an incident face 28 of the light guide plate 22 is different from that of adjacent LED packages 32. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a sidelight type backlight device used for a liquid crystal display device such as a liquid crystal display. The present invention also relates to a liquid crystal display device including a backlight device.

  Conventionally, a liquid crystal display has been used for a display of an electronic device such as a portable computer in consideration of portability. The liquid crystal display uses a liquid crystal panel which is a non-light emitting display device. For this reason, the liquid crystal display device includes a backlight device that irradiates the liquid crystal panel.

  Electronic devices that are considered to be portable are being made thinner. Therefore, a sidelight type is adopted as the backlight device.

A sidelight-type backlight device generally includes a light source and a light guide plate that guides light emitted from the light source to the entire liquid crystal panel. An incident surface on which light emitted from the light source is incident is formed on the side of the light guide plate. In addition, an emission surface that emits light incident from the incident surface is formed on the light guide plate. For example, a fluorescent lamp is used as the light source. The light source is disposed in the vicinity of the incident surface. (For example, refer to Patent Document 1).
Japanese Patent Laid-Open No. 10-40872

  On the other hand, there is a backlight device that uses an LED (Light-Emitting Diode) as a light source. In this type of backlight device, a red LED, a blue LED, and a green LED are accommodated in one housing to form an LED package, and a plurality of LED packages are used.

  As described above, the red LED, the blue LED, and the green LED are packaged in one package, whereby red, blue, and green are mixed. Therefore, the light emitted from the LED package is white.

  The structure of the LED package configured as described above will be specifically described. The LED package includes a housing, a red LED, a blue LED, and a green LED.

  The housing is a bathtub structure which is formed of a resin having reflectivity and has a vertical wall surrounding the periphery so that light emitted from each LED can be mixed efficiently. Each LED is housed in a housing, and is arranged so that a line connecting the LEDs has a substantially triangular shape so that light emitted from each LED can be mixed efficiently. The inside of the housing is sealed with a resin having transparency so that light emitted from each LED goes out.

  Each LED package is arranged in a line so that a portion (inner opening surrounded by a vertical wall) sealed with a permeable resin in the housing faces the incident surface of the light guide plate.

  However, in a backlight device that uses a plurality of LED packages having the above structure arranged in a row, uneven color tends to occur on the light guide plate. This point will be specifically described.

  As described above, the housing of the LED package has a bathtub structure. Furthermore, each LED is arrange | positioned so that the shape which connects these LED may become a substantially triangular shape. For this reason, each LED is arrange | positioned in the position which approached any site | part of the vertical wall in the housing.

  As a result, when each LED is viewed in plan (when the backlight device is viewed from above), one of the LEDs is arranged closer to one side in the LED package arrangement direction. For example, when the red LED is arranged closer to one side in the direction in which the LED packages are arranged, the shape of the irradiation range when the irradiation range of the red light irradiated from the LED package is viewed in plan is the vertical direction of the housing. The line is defined by a line connecting the red LED and a part close to the red LED in the direction in which the LED packages are arranged on the wall, and a line connecting the red LED and a part separated from the red LED in the direction in which the LED package is arranged on the vertical wall. The shape of the irradiation range defined as described above is a shape that is biased toward the other side in the direction in which the LEDs are arranged.

  However, contrary to the above, when the LED package is viewed in plan, the shape of the irradiation range of the LED, for example, the blue LED, arranged on the side opposite to the red LED in the direction in which the LED package is arranged is biased to one side.

  For this reason, it is difficult for red light to reach the vicinity of the LED package on one side in the direction in which the LED packages are arranged, and it is difficult for blue light to reach the vicinity of the LED package on the other side.

  As a result, on one side of the light guide plate in the direction in which the LEDs are arranged, the ratio of blue light is increased, so that it is difficult to mix colors and color unevenness is likely to occur. Similarly, on the other side of the light guide plate in the direction in which the LEDs are arranged, the proportion of red light increases, so that color mixing is difficult to occur and color unevenness is likely to occur.

  In the above description, the case where the red LED and the blue LED are arranged apart from each other in the direction in which the LED packages are arranged is described as an example, but the present invention is not limited to this. When any one of the plurality of LEDs housed in the housing is arranged near any part of the vertical wall, uneven color is likely to occur.

  Accordingly, an object of the present invention is to provide a backlight device that can suppress color unevenness on a light guide plate. Another object of the present invention is to provide a liquid crystal display device including a backlight device that can suppress the occurrence of uneven color on the light guide plate.

  The backlight device of the present invention includes a plurality of packages and a light guide plate. The light guide plate includes an incident surface on which light irradiated from the package is incident and an output surface that irradiates light incident from the incident surface toward the outside. A plurality of the plurality of packages are installed side by side in one direction. The package includes a package housing and a plurality of light sources. The package housing includes a cylindrical portion having a vertical wall surrounding the periphery, a bottom wall portion provided at one end of the cylindrical portion, and provided at the other end of the cylindrical portion from the inside of the cylindrical portion. And a passing portion through which light passes. The plurality of light sources are housed in the package housing and disposed on the bottom wall portion to emit light. At least a part of the arrangement of the light sources with respect to the incident surface is different from adjacent packages.

  According to this structure, even when the irradiation range of each light source irradiated from each package is biased, the bias is scattered by at least a part of the arrangement of the light sources in each package being different between adjacent packages. As a result, the light emitted from each light source is efficiently mixed in color on the light guide plate.

  In a preferred embodiment of the present invention, the plurality of light sources are arranged on the bottom wall portion according to a predetermined arrangement pattern. Each of the packages is installed in a posture that rotates relative to the posture of the adjacent package around the axial direction of the package housing.

  According to this structure, a package having the same structure can be used.

  The liquid crystal display device of the present invention includes a liquid crystal display device housing, a liquid crystal panel, and a backlight device. The liquid crystal panel is accommodated in the liquid crystal display device housing. The backlight device is accommodated in the liquid crystal display device housing. The backlight device includes a plurality of packages and a light guide plate. The light guide plate includes an incident surface on which light irradiated from the package is incident and an output surface that irradiates light incident from the incident surface toward the outside. A plurality of the plurality of packages are installed side by side in one direction. The package includes a package housing and a plurality of light sources. The package housing includes a cylindrical portion having a vertical wall surrounding the periphery, a bottom wall portion provided at one end of the cylindrical portion, and provided at the other end of the cylindrical portion from the inside of the cylindrical portion. And a passing portion through which light passes. The plurality of light sources are accommodated in the package housing and disposed on the bottom wall portion to emit light. At least a part of the arrangement of the light sources with respect to the incident surface is different from adjacent packages.

  According to this structure, even when the irradiation range of each light source irradiated from each package is biased, the bias is scattered by at least a part of the arrangement of the light sources in each package being different between adjacent packages. As a result, the light emitted from each light source is efficiently mixed in color on the light guide plate.

  According to the present invention, uneven color generation on the light guide plate is suppressed.

  A backlight device according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a partially exploded perspective view showing a portable DVD (Digital Video Disc) player 10 having a backlight device 20 of the present embodiment. The portable DVD player 10 is an example of an electronic device that includes the backlight device 20. The backlight device 20 may be used for other electronic devices such as a mobile phone.

  As shown in FIG. 1, the portable DVD player 10 includes a main body 11 and a liquid crystal display device 12. The main body 11 accommodates a disk (not shown). The liquid crystal display device 12 is attached to the main body 11 and displays an image.

  FIG. 1 shows a state where the liquid crystal display device 12 is disassembled. The liquid crystal display device 12 includes a first housing 13, a liquid crystal panel 14, and a backlight device 20. The liquid crystal panel 14 and the backlight device 20 are accommodated in the first housing 13. The first housing 13 is an example of a housing for a liquid crystal display device according to the present invention.

  In the state where the liquid crystal display device 12 stands with respect to the main body 11, an opening 15 is formed in the front wall portion 13 a of the first housing 13 facing forward. The first housing 13 is connected to the main body 11 so as to freely rotate between a position where the opening 15 is exposed and a position where the opening 15 is covered. The liquid crystal panel 14 has a screen 16. The screen 16 is exposed to the outside of the first housing 13 through the opening 15. In FIG. 1, the first housing 13 has a front wall portion 13 a disassembled, but is not limited thereto. In short, the first housing 13 only needs to accommodate the liquid crystal panel 14 and the backlight device 20 inside.

  The backlight device 20 is disposed on the opposite side of the opening 15 with the liquid crystal panel 14 in between, and faces the liquid crystal panel 14. The backlight device 20 irradiates the liquid crystal panel 14. FIG. 2 is a plan view showing the backlight device 20 as viewed from above. FIG. 3 is a cross-sectional view of the backlight device 20 shown along line F3-F3 shown in FIG. In FIG. 3, the liquid crystal panel 14 is indicated by a two-dot chain line. The relative positional relationship between the liquid crystal panel 14 and the backlight device 20 in FIG. 3 is the same as the relative positional relationship between the liquid crystal panel 14 and the backlight device 20 in the first housing 13.

  As shown in FIGS. 2 and 3, the backlight device 20 includes a second housing 21, a light guide plate 22, a reflection sheet 23, a diffusion sheet 24, a light guide 25, and a light source unit 30. .

  As shown in FIG. 3, the second housing 21 is, for example, a bottomed box type that opens on the liquid crystal panel 14 side. The second housing 21 has a bottom wall portion 26 and a vertical wall portion 27. The planar shape of the bottom wall portion 26 is substantially rectangular. The vertical wall portion 27 rises from the entire peripheral edge portion of the bottom wall portion 26. Therefore, the planar shape of the inner space defined by the vertical wall portion 27 and the bottom wall portion 26 is substantially rectangular.

  The light guide plate 22 is accommodated in the second housing 21. As shown in FIG. 3, the light guide plate 22 guides light emitted from the light source unit 30 described later to the liquid crystal panel 14. The light guide plate 22 has an entrance surface 28 and an exit surface 29. The incident surface 28 is formed on the side portion of the light guide plate 22 and faces the inner surface of the second housing 21. Light incident from the light source unit 30 is incident on the incident surface 28. The emission surface 29 is formed in a portion of the light guide plate 22 that faces the liquid crystal panel 14. The exit surface 29 emits the light incident from the entrance surface 28 toward the liquid crystal panel 14.

  The reflection sheet 23 is attached to the inner surface of the bottom wall portion 26 and faces the light guide plate 22. The diffusion sheet 24 is disposed between the light guide plate 22 and the liquid crystal panel 14. The light guide 25 is disposed between the incident surface 28 of the light guide plate 22 and the light source unit 30.

  4 is a cross-sectional view of the backlight device 20 shown along line F4-F4 shown in FIG. FIG. 4 shows the light source unit 30 as viewed from the front. As shown in FIGS. 2, 3, and 4, the light source unit 30 is installed on the inner surface of the second housing 21 at a position facing the incident surface 28 of the light guide plate 22, and emits light toward the incident surface 28. To do. In FIG. 4, the incident surface 28 is indicated by a two-dot chain line. The light source unit 30 includes a substrate 31 and a plurality of LED packages 32.

  As shown in FIGS. 2 and 3, the substrate 31 is fixed on the inner surface of the second housing 21 at a position facing the incident surface 28 of the light guide plate. As shown in FIG. 4, the LED packages 32 are arranged in a row on the substrate 31. The detailed arrangement structure of each LED package 32 on the substrate 31 will be described later in detail.

  FIG. 5 shows an enlarged view of F5 shown in FIG. FIG. 5 is a front view showing one LED package 32. As shown in FIG. 5, the LED package 32 includes a third housing 33, a red LED 34, a blue LED 35, and a green LED 36. Since the structure of each LED package 32 is the same, the structure of one LED package 32 will be described as a representative.

  FIG. 6 is a cross-sectional view of the LED package 32 taken along line F6-F6 shown in FIG. As shown in FIG. 6, the third housing 33 includes, for example, a box-shaped housing main body 37 that is open at one end, and a sealing portion 38. The third housing 33 is an example of a package housing referred to in the present invention.

  The housing body 37 has a bottom wall portion 39 and a vertical wall portion 40. As shown in FIG. 5, the planar shape of the bottom wall portion 39 is substantially rectangular. The vertical wall portion 40 rises from the entire peripheral edge of the bottom wall portion 39. Therefore, the vertical wall portion 40 has a cylindrical shape, and the planar shape of the inner space of the housing body 37 defined by the vertical wall portion 40 is substantially rectangular. The vertical wall portion 40 is an example of a cylindrical portion referred to in the present invention. The housing body 37 is made of a non-permeable resin and does not transmit light from the inside to the outside.

  The red LED 34 outputs red light. The blue LED 35 outputs blue light. The green LED 36 outputs green light. The red LED 34, the blue LED 35, and the green LED 36 are accommodated inside the housing body 37. The planar shape of the red LED 34, the blue LED 35, and the green LED 36 is, for example, a rectangle. The LEDs 34, 35, and 36 are arranged so that a line connecting the LEDs 34, 35, and 36 has a substantially triangular shape, and is fixed to the bottom wall portion 39.

  The arrangement of the LEDs 34, 35 and 36 will be specifically described. First, the vertical wall portion 40 has a first inner surface 41, a second inner surface 42, a third inner surface 43, and a fourth inner surface 44. The first inner surface 41 is located on the upper side in FIG. The second inner surface 42 is located on the right side in the figure. The third inner surface 43 is located below in FIG. The fourth inner surface 44 is located on the left side in FIG.

  The red LED 34 is disposed in the vicinity of the corner 45 defined by the second inner surface 42 and the third inner surface 43. The blue LED 35 is disposed in the vicinity of the corner 46 defined by the third inner surface 43 and the fourth inner surface 44. The red LED 34 and the blue LED 35 are arranged along the third inner surface 43. The green LED 36 is disposed between the first inner surface 41 and the red LED 34 and the blue LED 35 at a position facing the center of the first inner surface 41.

  In other words, the inner surface located near the green LED 36 is the first inner surface 41, the inner surface located near the red LED 34 is the second and third inner surfaces 42, 43, and the inner surface located near the blue LED 35 is the third. , 4 are the inner surfaces 43, 44. Thus, each LED 34, 35, 36 in each LED package 32 has the same arrangement pattern.

  FIG. 6 is a cross-sectional view showing a state in which the red LED 34 and the blue LED 35 are viewed from the first inner surface 41 side. FIG. 7 is a cross-sectional view of the LED package 32 taken along the line F7-F7 shown in FIG. FIG. 7 is a cross-sectional view of the LED package 32 showing the green LED 36 viewed from the third inner surface 43 side.

  As shown in FIGS. 6 and 7, the green LED 36, the red LED 34, and the blue LED 35 are electrically connected to the substrate 31 via the wiring 47.

  As shown in FIG. 6, the sealing portion 38 seals the inside of the housing main body 37. The sealing portion 38 has transparency and does not prevent the light output from the LEDs 34, 35, 36 from exiting from the opening 48 of the housing body 37. The sealing portion 38 is formed of an epoxy or silicone resin having transparency or diffusibility, and functions as a passing portion referred to in the present invention.

  Next, the arrangement and posture of each LED package 32 on the substrate 31 will be described. In this embodiment, as shown in FIGS. 2 and 4, for example, five LED packages 32 are used. In FIG. 2, the LED package 32 and the substrate 31 are shown in a partially cut state. Each LED package 32 is fixed on the substrate 31 so that the sealing portion 38 faces the incident surface 28 of the light guide plate 22, and is arranged in a line along the incident surface 28.

  As shown in FIG. 4, the postures of the LED packages 32 adjacent to each other on the substrate 31 are different. More specifically, in the LED package 32 disposed at one end 50 (one end along the direction in which the LED packages 32 are arranged) in the drawing, for example, the green LED 36 faces the opening 49 side of the second housing 21. Are arranged as follows.

  The postures of the other LED packages 32 are rotated 180 degrees around the axial center line 52 of the housing main body 37 as the other LED portions 32 (the other end portions along the direction in which the LED packages 32 are arranged) are shifted from each other. Become. The axis line 52 is indicated by a point in the figure. That is, the LED packages 32 adjacent to each other in the direction in which the LED packages 32 are arranged are arranged in a posture rotated relatively 180 degrees around the axis 52 of the third housing 33. Therefore, in the light source unit 30, the LED packages 32 are arranged so that the first inner surface 41 and the third inner surface 43 are alternately arranged on the opening 49 side of the second housing 21.

  As a result, the arrangement of the LEDs 34, 35, 36 of the LED packages 32 with respect to the incident surface 28 is different between the adjacent LED packages 32.

  Light emitted from each LED package 32 arranged as described above (light emitted from the green LED 36, the red LED 34, and the blue LED 35 to the outside through the sealing portion 38) is incident on the light guide plate 22. The surface 28 is irradiated.

  Next, the shape of the light irradiation range of each LED 34, 35, 36 irradiated to the outside through the sealing portion 38 as viewed from the opening 49 side of the second housing 21 will be described. As described above, in each LED package 32, either the first inner surface 41 or the third inner surface 43 is located on the opening 49 side.

  Therefore, the shape of the irradiation range of the light emitted from each LED package 32 as viewed from the opening 49 side is the same as the shape of the light emitted from each LED package 32 as viewed from the first inner surface 41. . Further, the first inner surface 41 and the third inner surface 43 face each other. Therefore, the shape of the irradiation range of the light emitted from the LED package 32 viewed from the third inner surface 43 side is the same as the shape viewed from the first inner surface 41 side.

  FIG. 7 shows a shape of the irradiation range of the green LED 36 as viewed from the third inner surface 43 side. The shape of the irradiation range of the green LED 36 irradiated from the LED package as viewed from the third inner surface 43 side is the first and second connecting the green LED 36 and the edges 53 and 54 of the second and fourth inner surfaces 42 and 44. Defined by lines 55 and 56. The irradiation range is a range surrounded by the first and second lines 55 and 56.

  As shown in FIG. 7 and as described above, the green LED 36 is disposed at a position facing substantially the center of the first and third inner surfaces 41 and 43. Therefore, the first line 55 connecting the green LED 36 and the edge 53 of the second inner surface 42 and the second line 56 connecting the green LED 36 and the edge 54 of the fourth inner surface 44 sandwich the green LED 36. It becomes symmetrical with each other.

  As a result, when the irradiation range of the green LED 36 irradiated from the LED package 32 is viewed from the third inner surface 43 side, both the second and fourth inner surfaces 42 and 44 are similarly expanded outward. In addition, the outer side said here is a direction which goes to the 2nd, 4th inner surfaces 42 and 44 from the green LED36.

  FIG. 6 shows the shape of the irradiation range of the red LED 34 and the blue LED 35 as viewed from the first inner surface 41 side. The shape of the irradiation range of the red LED 34 viewed from the first inner surface 41 side is defined by third and fourth lines 57 and 58 that connect the red LED 34 and the edges 53 and 54 of the second and fourth inner surfaces 42 and 44. . The irradiation range is a range surrounded by the third and fourth lines 57 and 58. The third and fourth lines 57 and 58 are indicated by alternate long and short dash lines.

  As shown in FIG. 6 and as described above, the red LED 34 is disposed at a position close to the second inner surface 42. Therefore, the fourth line 58 connecting the red LED 34 and the edge 54 of the fourth inner surface 44 is greatly inclined with respect to the third line 57 connecting the red LED 34 and the edge 53 of the second inner surface 42. ing. As a result, the shape of the irradiation range of the red LED 34 viewed from the first inner surface 41 side is a shape that is biased toward the fourth inner surface 44 side.

  The shape of the irradiation range of the blue LED 35 viewed from the first inner surface 41 side is defined by fifth and sixth lines 59 and 60 connecting the blue LED 35 and the edges 53 and 54 of the second and fourth inner surfaces 42 and 44. . The irradiation range is a range surrounded by the fifth and sixth lines 59 and 60. The fifth and sixth lines 59 and 60 are indicated by dotted lines.

  As shown in FIG. 6 and as described above, the blue LED 35 is disposed at a position close to the fourth inner surface 44. Therefore, the fifth line 59 connecting the blue LED 35 and the edge 53 of the second inner surface 42 is greatly inclined with respect to the sixth line 60 connecting the blue LED 35 and the edge 54 of the fourth inner surface 44. ing. As a result, the shape of the irradiation range of the blue LED 35 viewed from the first inner surface 41 side is a shape that is biased toward the second inner surface 42 side.

  Next, the distribution of light incident on the light guide 25 and the light guide plate 22 among the light of each LED 34, 35, 36 irradiated from each LED package 32 will be described.

  FIG. 8 shows an example of the distribution of the green light emitted from each LED package 32 in the light guide 25 and the light guide plate 22. In FIG. 8, the light guide 25 and the light reflected in the light guide plate 22 are not shown. Further, in FIG. 8, the LED package 32 and the substrate 31 are shown in a partially cut state for easy understanding of the position of the green LED 36. As shown in FIG. 8, the green LED 36 is disposed at a position facing the substantially central portion of the first and third inner surfaces 41, 43, so that the light guide 25 and the light guide plate 22 are irradiated substantially uniformly.

  It is considered that the green light emitted from each LED package 32 is emitted to the end on the light source unit 30 side at one end 50 and the other end 51 of the light guide plate 22. Specifically, the relative shape and relative position of the third housing 33 and the green LED 36 are considered. For example, the positions of the edges 53 and 54 of the vertical wall portion 40 of the third housing 33 with respect to the position of the green LED 36.

  FIG. 9 shows an example of the distribution of the red light emitted from each LED package 32 in the light guide 25 and the light guide plate 22. In FIG. 9, the light guide 25 and the light reflected in the light guide plate 22 are not shown. As shown in FIG. 9, the LED package 32 disposed at the one end portion 50 is disposed in a posture in which the fourth inner surface 44 approaches the other end portion 51 side. Therefore, the irradiation range of the red light emitted from the LED package 32 disposed at the one end portion 50 is biased toward the fourth inner surface 44 side, that is, the other end portion 51 side.

  The LED package 32 arranged at a position shifted by one toward the other end 51 side is arranged in such a posture that the second inner surface 42 approaches the other end 51 side. Therefore, the irradiation range of the red light irradiated from the LED package 32 is biased toward the one end portion 50 side.

  Furthermore, the LED package 32 arranged at a position shifted by one toward the other end 51 side is arranged in such a posture that the second inner surface 42 approaches the one end 50 side. Therefore, the irradiation range of the red light emitted from the LED package 32 is biased toward the other end 51 side.

  Further, the LED package 32 disposed at a position shifted by one toward the other end 51 side is disposed in such a posture that the second inner surface 42 approaches the other end 51 side. Therefore, the irradiation range of the red light irradiated from the LED package 32 is biased toward the one end portion 50 side.

  The LED package 32 disposed at the other end 51 is disposed in such a posture that the second inner surface 42 approaches the one end 50 side. Therefore, the irradiation range of the red light emitted from the LED package 32 is biased toward the other end 51 side.

  In addition, the red light irradiated from each LED package 32 is arranged in a posture in which the adjacent packages 32 rotate relative to each other by 180 degrees, so that the one end 50 and the other end 51 of the light guide plate 22 are arranged. The light source unit 30 side end is considered to be irradiated. Specifically, the relative shape and relative position of the third housing 33 and the red LED 34 are considered. For example, the positions of the edges 53 and 54 of the vertical wall portion 40 of the third housing 33 with respect to the position of the red LED 34.

  As described above, the red light emitted from each LED package 32 is alternately biased toward the one end portion 50 side and the other end portion 51 side, whereby one end portion 50 of the portion near the light source unit 30 side in the light guide plate 22. The red light comes to the side and the other end 51 side.

  Further, although not shown, the red light emitted from each LED package 32 is reflected, so that the red light is further spread in the light guide plate 22.

  FIG. 10 shows an example of the distribution of the blue light irradiated from each LED package 32 in the light guide 25 and the light guide plate 22. In FIG. 10, the light guide 25 and the light reflected in the light guide plate 22 are not shown. As shown in FIG. 10, the LED package 32 disposed at the one end 50 is disposed in such a posture that the second inner surface 42 approaches the one end 50 side. Therefore, the irradiation range of the blue light emitted from the LED package 32 arranged at the one end 50 is biased toward the one end 50.

  The LED package 32 arranged at a position shifted by one toward the other end 51 side is arranged in such a posture that the second inner surface 42 approaches the other end 51 side. Therefore, the irradiation range of the blue light emitted from the LED package 32 is biased toward the other end 51 side.

  Furthermore, the LED package 32 arranged at a position shifted by one toward the other end 51 side is arranged in such a posture that the second inner surface 42 approaches the one end 50 side. Therefore, the irradiation range of the blue light emitted from the LED package 32 is biased toward the one end 50 side.

  Furthermore, the LED package 32 arranged at a position shifted by one toward the other end 51 side is arranged in such a posture that the second inner surface 42 approaches the other end 51 side. Therefore, the irradiation range of the blue light emitted from the LED package 32 is biased toward the other end 51 side.

  The LED package 32 disposed at the other end 51 is disposed in such a posture that the second inner surface 42 approaches the one end 50 side. Therefore, the irradiation range of the blue light emitted from the LED package 32 is biased toward the one end 50 side.

  In addition, the blue light irradiated from each LED package 32 is arranged in a posture in which the adjacent packages 32 are rotated by 180 degrees relative to each other, whereby the one end portion 50 and the other end portion 51 of the light guide plate 22 are arranged. The light source unit 30 side end is considered to be irradiated. Specifically, the relative shape and relative position of the third housing 33 and the blue LED 35 are considered. For example, the positions of the edges 53 and 54 of the vertical wall portion 40 of the third housing 33 with respect to the position of the blue LED 35.

  As described above, the blue light emitted from each LED package 32 is alternately biased toward the one end portion 50 side and the other end portion 51 side, so that the portion near the light source unit 30 in the light guide plate 22 is located on the one end portion 50 side. And blue light come to the other end 51 side.

  Further, although not shown, the blue light emitted from each LED package 32 is reflected, whereby the blue light is further spread in the light guide plate 22.

  As described above, the red light, the blue light, and the green light are sufficiently distributed to the portion near the light source unit 30 at the 53 one end portion 50 and the other end portion 51 of the light guide plate 22. As a result, in the light guide plate 22, red light, blue light, and green light are mixed evenly.

  In the backlight device 20 configured as described above, the positions of the LEDs 34, 35, and 36 of the LED package 32 with respect to the incident surface 28 of the light guide plate 22 are different between the LED packages 32 adjacent to each other. For this reason, even if the irradiation range of the red LED 34 and the irradiation range of the blue LED 35 are uneven in each LED package 32 as in the present embodiment, for example, the unevenness is scattered. Light of each color is sufficiently distributed to the light source unit 30 side end in the vicinity and the light source unit 30 side end in the vicinity of the other end 51. Therefore, in the light guide plate 22, the light source unit 30 side end in the vicinity of the one end 50 and the light source unit 30 side end in the vicinity of the other end 51 are sufficiently mixed in each color. Color unevenness is unlikely to occur on the top (on the emission surface 29).

  Further, in the present embodiment, the arrangement of the LEDs 34, 35, 36 of the LED packages 32 with respect to the incident surface 28 is completely different between the LED packages 32 adjacent to each other. Therefore, color mixing on the light guide plate 22 is performed more efficiently, and color unevenness is less likely to occur.

  The LED packages 32 have the same structure in which the LEDs 34, 35, and 36 have the same arrangement pattern. The LED packages 32 that are adjacent to each other are arranged in a posture that is relatively rotated around the axis 52. As a result, the arrangement of the LEDs 34, 35, 36 of the LED packages 32 adjacent to each other with respect to the incident surface 28 is different from each other.

  In this way, when each LED package 32 is fixed on the substrate 31, it is only necessary to adjust the posture of each LED package 32, so that the entire structure of the apparatus is simplified by using the LED package 32 having the same structure. At the same time, the occurrence of uneven color on the light guide plate 22 can be suppressed.

  In addition, by fixing the LED packages 32 adjacent to each other in a posture that is relatively rotated by 180 degrees, the bias of the irradiation range of the red light and the bias of the irradiation range of the blue light are alternately switched. Therefore, the occurrence of uneven color on the light guide plate 22 can be more effectively suppressed.

  Next, a backlight device 20 according to a second embodiment of the present invention will be described with reference to FIG. In addition, the structure which has a function similar to 1st Embodiment attaches | subjects the same code | symbol, and abbreviate | omits description. In the present embodiment, the relative rotation angle around the axis 52 of the LED packages 32 adjacent to each other is different from that of the first embodiment. Other structures may be the same as those in the first embodiment. The different points will be specifically described.

  FIG. 11 is a front view showing the light source unit 30 of the present embodiment. As shown in FIG. 11, in the present embodiment, the adjacent LED packages 32 are arranged in a posture that relatively rotates 90 degrees. In addition, the rotation direction of each LED package 32 is the same direction. Even in the present embodiment, the bias of the light emitted from each LED 34, 35, 36 is scattered, so that the same effect as in the first embodiment can be obtained.

  Next, a backlight device 20 according to a third embodiment of the present invention will be described with reference to FIG. In addition, the structure which has a function similar to 1st Embodiment attaches | subjects the same code | symbol, and abbreviate | omits description. In the present embodiment, the relative rotation angle around the axis 52 of the LED packages 32 adjacent to each other is different from that of the first embodiment. Other structures may be the same as those in the first embodiment. The different points will be specifically described.

  FIG. 12 is a front view showing the light source unit 30 of the present embodiment. As shown in FIG. 12, in the present embodiment, adjacent LED packages 32 are arranged in a posture that relatively rotates 30 degrees. In addition, the rotation direction of each LED package 32 is the same direction. Even in the present embodiment, the bias of the light emitted from each LED 34, 35, 36 is scattered, so that the same effect as in the first embodiment can be obtained.

  Next, a backlight device 20 according to a fourth embodiment of the present invention will be described with reference to FIG. In addition, the structure which has a function similar to 1st Embodiment attaches | subjects the same code | symbol, and abbreviate | omits description. In the present embodiment, the relative rotation angle around the axis 52 of the LED packages 32 adjacent to each other is different from that of the first embodiment. Other structures may be the same as those in the first embodiment. The above different points will be specifically described.

  FIG. 13 is a front view showing the light source unit 30 of the present embodiment. As shown in FIG. 13, in the present embodiment, adjacent LED packages 32 are arranged in a posture that relatively rotates 60 degrees. In addition, the rotation direction of each LED package 32 is the same direction. Even in the present embodiment, the bias of the light emitted from each LED 34, 35, 36 is scattered, so that the same effect as in the first embodiment can be obtained.

  In the first to fourth embodiments, the LED package 32 has the opening 48 sealed by the sealing portion 38, but is not limited thereto. For example, the opening 48 may not be sealed by the sealing portion 38. In this case, the opening 48 becomes a passing portion in the present invention.

  In the first to fourth embodiments, the example in which the adjacent LED packages 32 rotate by 180 degrees, 90 degrees, 30 degrees, and 60 degrees is shown, but the present invention is not limited to this. Adjacent LED packages 32 may rotate 120 degrees, 150 degrees, 210 degrees, 240 degrees, 270 degrees, 300 degrees, and 330 degrees around the axis 52 in the same direction. Even in this case, the same effects as those of the first to fourth embodiments can be obtained.

  In short, the adjacent LED packages 32 rotate at an angle indicated by 30 × n (n is 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11) around the axis 52. By doing so, the same effect as the first to fourth embodiments can be obtained.

  In the first to fourth embodiments, the package 32 includes three light sources (green LED 36, red LED 34, and blue LED 35). However, it is not limited to this. For example, four light sources may be provided. As an example in this case, it is conceivable to include one red LED 34, one blue LED 35, and two green LEDs 36.

1 is a partially exploded perspective view showing a portable DVD player including a backlight device according to a first embodiment of the present invention. The top view which shows the backlight apparatus shown by 1 in the figure. Sectional drawing of the backlight apparatus shown along F3-F3 line shown in FIG. Sectional drawing of the backlight apparatus shown along F4-F4 line shown in FIG. The front view which expands and shows the range of F5 shown in FIG. Sectional drawing of the LED package shown along F6-F6 line shown in FIG. Sectional drawing of the LED package shown along F7-F7 line | wire shown in FIG. The top view which shows an example of distribution in the light guide and light guide plate of the green light irradiated from each LED package shown by FIG. The top view which shows an example of distribution in the light guide of the red light irradiated from each LED package shown by FIG. 2, and a light-guide plate. The top view which shows an example of distribution in the light guide of the blue light irradiated from each LED package shown by FIG. 2, and a light-guide plate. The front view which shows the light source unit of the backlight apparatus which concerns on the 2nd Embodiment of this invention. The front view which shows the light source unit of the backlight apparatus which concerns on the 3rd Embodiment of this invention. The front view which shows the light source unit of the backlight apparatus which concerns on the 4th Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 12 ... Liquid crystal display device, 13 ... 1st housing (housing for liquid crystal display devices), 20 ... Backlight device, 22 ... Light guide plate, 28 ... Incident surface, 29 ... Output surface, 32 ... LED package (package), 33 ... Third housing (package housing), 34 ... Red LED (light source), 35 ... Blue LED (light source), 36 ... Green LED (light source), 38 ... Sealed part (passing part), 52 ... Axial line .

Claims (8)

Multiple packages,
A light guide plate comprising an incident surface on which light irradiated from the package is incident, and an output surface that irradiates light incident from the incident surface toward the outside;
A backlight device comprising:
The package is
A cylindrical part having a vertical wall surrounding the periphery, a bottom wall part provided at one end of the cylindrical part, and a light provided from the inside of the cylindrical part to the outside provided at the other end of the cylindrical part A housing for a package comprising a passage portion;
A plurality of light sources disposed in the package housing and disposed on the bottom wall portion to emit light;
Comprising
The plurality of packages are installed in a row in one direction,
At least a part of the arrangement of the light sources with respect to the incident surface is different from adjacent packages.   The backlight device according to claim 1, wherein the plurality of light sources include at least a light source that emits red light, a light source that emits green light, and a light source that emits blue light. The plurality of light sources are arranged on the bottom wall according to a predetermined arrangement pattern,
2. The backlight device according to claim 1, wherein each of the packages is installed in a posture that rotates relative to the posture of the adjacent package around the axial direction of the package housing.   Each of the packages is 30 × n (n is 1, 2, 3, 4, or 4) in a fixed direction around the axis line with respect to the posture of the adjacent package along one direction among the directions in which a plurality of packages are arranged. 4. The backlight device according to claim 3, wherein the backlight device is in a posture rotated by 5, 6, 7, 8, 9, 10, 11) degrees. A housing for a liquid crystal display device;
A liquid crystal panel housed in the liquid crystal display housing;
The light guide is housed in the liquid crystal display device housing and includes a plurality of packages, an incident surface on which light emitted from the package is incident, and an output surface on which light incident from the incident surface is irradiated outward. A backlight device in which a plurality of packages are installed side by side in one direction,
Comprising
The package is
A cylindrical part having a vertical wall surrounding the periphery, a bottom wall part provided at one end of the cylindrical part, and a light provided from the inside of the cylindrical part to the outside provided at the other end of the cylindrical part A housing for a package comprising a passage portion;
A plurality of light sources disposed in the package housing and disposed on the bottom wall portion to emit light;
Comprising
The liquid crystal display device according to claim 1, wherein at least a part of the arrangement of the light sources with respect to the incident surface is different from adjacent packages.   The liquid crystal display device according to claim 5, wherein the plurality of light sources include at least a light source that emits red light, a light source that emits green light, and a light source that emits blue light. The plurality of light sources are arranged on the bottom wall according to a predetermined arrangement pattern,
6. The liquid crystal display device according to claim 5, wherein each of the packages is installed in a posture that rotates relative to the posture of the adjacent package around the axial direction of the package housing.   Each of the packages is 30 × n (n is 1, 2, 3, 4, or 4) in a fixed direction around the axis line with respect to the posture of the adjacent package along one direction among the directions in which a plurality of packages are arranged. 8. The liquid crystal display device according to claim 7, wherein the liquid crystal display device has a posture rotated by 5, 6, 7, 8, 9, 10, 11) degrees.

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