JP2012221779A - Display device and display module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device capable of restraining generation of deviation (unevenness) of illuminance at a display part in case of use of a diffusion plate with convex parts formed.SOLUTION: The liquid crystal display 100 (the display device) is provided with a liquid crystal panel 33, LEDs 41 each containing a light-emitting part 41a for irradiating light to the liquid crystal panel 33, and a diffusion plate 43 containing diffusion particles for diffusing light from the light-emitting parts 41a and with convex parts 50 protruded in a gentle curved surface shape on the LED 41 side at least in a region corresponding to the light-emitting parts 41a of the LEDs 41 out of a surface 43a on the LED 41 side integrally formed.

Description

  The present invention relates to a display device and a display module, and more particularly to a display device and a display module provided with a diffusion plate.

  Conventionally, a display device and a display module provided with a diffusion plate are known (see, for example, Patent Document 1).

  Patent Document 1 discloses a liquid crystal display device that includes a liquid crystal panel and a backlight unit that is disposed on the back side of the liquid crystal panel and irradiates the liquid crystal panel with light. In the backlight unit of the liquid crystal display device described in Patent Document 1, an optical sheet, a flat diffusion plate, and a light source lamp are arranged in this order from the liquid crystal panel side. Further, the optical sheet is formed on the polarization separation sheet, a plurality of hemispherical lens portions that are formed on the liquid crystal panel side surface of the polarization separation sheet, and on the diffusion plate side surface of the polarization separation sheet It is comprised from the scattering reflection film | membrane formed in this. Here, by arranging the plurality of lens portions adjacent to each other, the connection region (boundary region) between the plurality of lens portions is configured to be acutely sharp toward the polarization separation sheet side.

JP 2007-304398 A

  However, for example, the same lens as the hemispherical lens portion (convex portion) provided in the liquid crystal display device described in Patent Document 1 on the surface of the flat diffusion plate of the liquid crystal display device described in Patent Document 1 When the portion (convex portion) is formed, it is considered that the end portion (boundary region) of the region where the individual lens portions of the diffusion plate are formed has a steep surface shape. In this case, since light is hardly diffused in the boundary region having a steep surface shape, it is considered that light is not sufficiently irradiated to the liquid crystal panel side around the boundary region. For this reason, the brightness of the liquid crystal panel (display unit) is uneven (unevenness) due to the brightness of the liquid crystal panel corresponding to the periphery of the border area becoming darker than the border area and other areas. There seems to be a problem that it occurs.

  The present invention has been made in order to solve the above-described problems, and one object of the present invention is to bias the luminance (unevenness) in the display portion when a diffuser plate having convex portions is used. ) Occurs in a display device and a display module.

Means for Solving the Problems and Effects of the Invention

  A display device according to a first aspect of the present invention includes a display unit, a light emitting element including a light emitting unit for irradiating the display unit with light, and diffusing particles for diffusing light from the light emitting unit. And a diffusion plate integrally formed with a first convex portion protruding in a gently curved shape on the light emitting element side in at least a region corresponding to the light emitting portion of the light emitting element.

  In the display device according to the first aspect of the present invention, as described above, of the first surface on the light emitting element side, at least in the region corresponding to the light emitting portion of the light emitting element, the first curved surface that protrudes gently on the light emitting element side. By providing the diffuser plate in which one convex part is integrally formed, the first convex part protrudes in a gentle curved surface, so that light is hardly diffused into a region corresponding to the light emitting part of the light emitting element of the diffuser plate. A boundary region having such a steep surface shape is not formed. As a result, it is possible to sufficiently irradiate the display unit side with light in a region corresponding to the light emitting unit of the light emitting element of the diffusion plate, and thus it is possible to suppress a decrease in luminance of a part of the display unit and darkening of the surrounding area can do. As a result, it is possible to suppress the occurrence of unevenness (unevenness) in the luminance of the display unit.

  Here, since the region corresponding to the light emitting portion of the light emitting element has a larger amount of light from the light emitting portion than the other regions, the region corresponding to the light emitting portion of the light emitting element is brighter and brighter than the other regions. Prone. Therefore, in the display device according to the first aspect of the present invention, as described above, the first convex portion protruding in a gentle curved shape on the light emitting element side at least in the region corresponding to the light emitting portion of the light emitting element is integrated with the diffusion plate. The first surface of the first convex part formed so as to protrude in a gently curved shape on the light emitting element side and the inside of the first convex part (diffusing plate) containing the diffusing particles The light irradiated to the area | region corresponding to the light emission part of the light emitting element of a diffuser plate can be diffused more widely. This also prevents the area corresponding to the light-emitting part of the light-emitting element of the display unit from becoming brighter and brighter than other areas, thereby suppressing the occurrence of bias in the luminance of the display part. can do.

  In the display device according to the first aspect, preferably, the first convex portion of the diffusion plate is formed so that the protrusion amount is maximized in a region corresponding to the light emitting portion of the light emitting element. According to this structure, the thickness of the diffusion plate in the region corresponding to the light emitting part of the light emitting element can be made larger than the thickness of the diffusion plate in the other region, so that the first protrusions containing the diffusion particles are included. Light can be diffused more inside the part. Thereby, since the light irradiated to the area | region corresponding to the light emission part of a light emitting element can be spread | diffused further widely, the area | region corresponding to the light emission part of the light emitting element of a display part becomes brighter than another area | region. It can be suppressed more.

  In the display device according to the first aspect, preferably, a plurality of light emitting elements are provided, and a plurality of first protrusions of the diffusion plate are provided, and a region corresponding to the light emitting parts of the plurality of light emitting elements. Are connected to each other by gentle curved surface portions. If comprised in this way, the boundary which has a steep surface shape that light is hardly diffused in the connection area | region of 1st convex parts by mutually connecting several 1st convex parts by the gentle curved surface part. A region is not formed. As a result, even in the connection region between the first convex portions of the diffusion plate, light can be sufficiently irradiated to the display unit side, so that the luminance of part of the display unit is reduced and it is suppressed from becoming darker than the surroundings. can do. As a result, it is possible to suppress the occurrence of bias in the luminance of the display unit. In addition, by forming the plurality of first convex portions of the diffusion plate in the regions corresponding to the light emitting portions of the plurality of light emitting elements, the light irradiated to the regions corresponding to the light emitting portions of the plurality of light emitting elements is spread over a wide range. Can be diffused. Accordingly, it is not necessary to bring the light emitting elements close to each other in order to obtain the same luminance as the area corresponding to the light emitting portion of the light emitting element even in the area between the adjacent light emitting elements, so that the number of light emitting elements can be reduced. it can.

  In this case, preferably, in the diffusion plate, a convex spherical surface formed in a region corresponding to the light emitting portion of the plurality of light emitting elements, and a concave curved surface formed in a region connecting the convex spherical portions to each other. The parts are connected in a gently curved shape. If comprised in this way, since the 1st convex parts can be connected gently and smoothly with a concave-shaped curved surface part, light is fully displayed in the connection area | region of the 1st convex parts of a diffuser plate easily. It can irradiate the part side.

  In the display device according to the first aspect described above, preferably, the diffusion plate protrudes to the opposite side of the light emitting element in at least a region corresponding to the light emitting portion of the light emitting element, on the second surface opposite to the light emitting element. The second convex portion to be formed is further integrally formed. If comprised in this way, since the thickness of the diffusion plate in the area | region corresponding to the light emission part of a light emitting element can be made larger than the thickness of the diffusion plate in another area | region, the 1st diffusion particle is contained. Light can be sufficiently diffused inside the convex portion and the second convex portion. Thereby, since the light irradiated to the area | region corresponding to the light emission part of a light emitting element can be spread | diffused further widely, the area | region corresponding to the light emission part of the light emitting element of a display part becomes brighter than another area | region. It can be suppressed more.

  In this case, it is preferable that the second convex portion of the diffusion plate is formed so that the protrusion amount is maximized in a region corresponding to the light emitting portion of the light emitting element. With this configuration, the thickness of the diffusion plate in the region corresponding to the light emitting portion of the light emitting element can be made larger than the thickness of the diffusion plate in the other region, so that the diffusion particles are included. Light can be further diffused inside the first convex portion and the second convex portion. Thereby, since the light irradiated to the area | region corresponding to the light emission part of a light emitting element can be spread | diffused more widely, the area | region corresponding to the light emission part of the light emitting element of a display part becomes brighter than another area | region. Can be further suppressed.

  In the display device in which the second convex portion is formed on the diffusion plate, preferably, the first convex portion and the second convex portion of the diffusion plate are substantially mirror-image symmetrical with respect to a substantial center in the thickness direction of the diffusion plate. It is formed to become. If comprised in this way, since the 1st surface and 2nd surface of a diffusion plate can be made into substantially the same shape, it is not necessary to distinguish a 1st surface and a 2nd surface at the time of the assembly of a display apparatus. Thereby, the assembly process of a display apparatus can be simplified.

  In the display device according to the first aspect described above, preferably, the light emitting element irradiates the display unit with light through the diffusion plate integrally formed with the first convex portion and not through the light guide plate. It is configured. With this configuration, in the direct type display device that directly irradiates light through the diffusion plate without using the light guide plate by arranging the light emitting element directly below the display unit and the diffusion plate, By providing the diffusion plate integrally formed with the first convex portion protruding in a gently curved shape on the light emitting element side, it is possible to suppress the occurrence of bias in the luminance of the display portion.

  A display module according to a second aspect of the present invention includes a display unit, a light emitting element including a light emitting unit for irradiating the display unit with light, and diffusing particles for diffusing light from the light emitting unit. And a diffusion plate integrally formed with a first convex portion protruding in a gently curved shape on the light emitting element side in at least a region corresponding to the light emitting portion of the light emitting element.

  In the display module according to the second aspect of the present invention, as described above, in the first surface on the light emitting element side, at least in the region corresponding to the light emitting portion of the light emitting element, the first curved surface projecting into a gentle curved surface on the light emitting element side. By providing the diffuser plate in which one convex part is integrally formed, the first convex part protrudes in a gentle curved surface, so that light is hardly diffused into a region corresponding to the light emitting part of the light emitting element of the diffuser plate. A boundary region having such a steep surface shape is not formed. As a result, it is possible to sufficiently irradiate the display unit side with light in a region corresponding to the light emitting unit of the light emitting element of the diffusion plate, and thus it is possible to suppress that the luminance of a part of the display unit is lowered and becomes darker than the surroundings. can do. As a result, it is possible to suppress the occurrence of unevenness (unevenness) in the luminance of the display unit. Further, by forming a first convex portion that protrudes in a gentle curved shape on the light emitting element side at least in a region corresponding to the light emitting portion of the light emitting element, the first convex portion protrudes in a gentle curved shape on the light emitting element side. The region corresponding to the light emitting portion of the light emitting element of the diffuser plate is irradiated by the first surface of the first convex portion formed in such a manner and the inside of the first convex portion (diffuser plate) containing the diffusion particles. Light can be diffused more widely. Thereby, since it can suppress that the area | region corresponding to the light emission part of the light emitting element of a display part increases and becomes brighter than another area | region, it suppresses that the brightness | luminance of a display part generate | occur | produces. be able to.

1 is a perspective view showing an overall configuration of a liquid crystal display device according to a first embodiment of the present invention. 1 is an exploded perspective view showing an internal structure of a display device body in a liquid crystal display device according to a first embodiment of the present invention. FIG. 3 is a partial cross-sectional view taken along line 400-400 in FIG. 2. It is the top view which looked at the diffusion plate and LED in the liquid crystal display device by 1st Embodiment of this invention from the rear frame side. It is sectional drawing which showed the internal structure in the liquid crystal display device by 2nd Embodiment of this invention. It is sectional drawing which showed the diffusion plate and LED in the liquid crystal display device by 2nd Embodiment of this invention. It is sectional drawing which showed the internal structure in the liquid crystal display device by the modification of 1st Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
First, a configuration of a liquid crystal display device 100 according to an embodiment of the present invention will be described with reference to FIGS. Further, the liquid crystal display device 100 exemplified below may be a liquid crystal television device having a TV tuner function, or a liquid crystal monitor connected to a PC or the like. The liquid crystal display device 100 is an example of the “display device” in the present invention.

  As shown in FIG. 1, the liquid crystal display device 100 according to an embodiment of the present invention includes a display device body 10 and a stand 20 that rotatably supports the display device body 10. As shown in FIG. 2, the display device body 10 includes a resin front cabinet 11 and a rear cabinet 12, and a liquid crystal module 30 disposed between the front cabinet 11 and the rear cabinet 12. The liquid crystal module 30 is an example of the “display module” in the present invention.

  As shown in FIG. 1, the front cabinet 11 has a frame shape in which a portion (display region D) where a later-described liquid crystal panel 33 is exposed on the front side of the liquid crystal display device 100 is cut out into a substantially rectangular shape. . As shown in FIG. 2, the rear cabinet 12 is integrally provided with an attachment portion 12 a for attaching a leg portion 20 a (see FIG. 1) of the stand 20. Further, screw insertion holes 12b (seven locations) for inserting screws 91 are provided on the outer peripheral portion of the rear cabinet 12. The rear cabinet 12 is fixed to the front cabinet 11 by inserting screws 91 into the screw insertion holes 12b. Further, the liquid crystal module 30 is disposed between the front cabinet 11 and the rear cabinet 12 in a state where the liquid crystal module 30 is attached to the inside (A2 side) of the front cabinet 11 with screws 92.

  In addition, the liquid crystal module 30 includes a metal front frame 31 formed in a frame shape having four sides, and a metal rear frame 32 attached to the front frame 31.

  FIG. 3 is a partial cross-sectional view taken along a plane extending in the B direction along the line 400-400 shown in FIG. Here, the cross section cut along the plane extending along the C direction orthogonal to the B direction is configured to be the same as the cross section cut along the plane extending in the B direction. That is, the cross section cut along the plane extending along the C direction is configured as shown in FIG.

  As shown in FIG. 3, the front frame 31 includes a bottom 31b having a substantially rectangular opening 31a corresponding to the display area D, a wall 31c extending toward the A2 side along the outer edge of the bottom 31b, and a wall 31c. And an eaves portion 31d extending in a substantially horizontal direction (B direction and C direction) along the outer edge portion. The rear frame 32 has a bottom portion 32a having no opening, a wall portion 32b extending toward the liquid crystal panel 33 (A1 side) in an inclined state with respect to the bottom portion 32a, and a substantially horizontal portion along the outer edge portion of the wall portion 32b. And a flange 32c extending in the direction (B direction and C direction). In addition, the rear frame 32 is fixed to the front frame 31 with a screw member (not shown) in a state where the flange portion 31d of the front frame 31 and the flange portion 32c of the rear frame 32 are in contact with each other. Thereby, a space 30a is formed in a region where the bottom 31b of the front frame 31 and the bottom 32a of the rear frame 32 face each other.

  In the space 30a, a liquid crystal panel 33 for forming an image, a resin frame 34 that supports the liquid crystal panel 33, and a backlight unit 40 for irradiating the liquid crystal panel 33 with light are disposed. . The resin frame 34 includes a wall 34a extending in the A direction and a support 34b that supports the liquid crystal panel 33 from the A2 side. The support portion 34b has an opening 34c for irradiating the liquid crystal panel 33 with light from the backlight portion 40 in the central region. The liquid crystal panel 33 is an example of the “display unit” in the present invention.

  The liquid crystal panel 33 is disposed on the A2 side of the opening 31a of the front frame 31 and on the A1 side of the opening 34c of the support portion 34b. Further, the liquid crystal panel 33 is configured to display an image using light emitted from the backlight unit 40 in the display region D corresponding to the opening 31a. The backlight unit 40 is disposed on the A2 side of the liquid crystal panel 33.

  As shown in FIG. 3, the backlight unit 40 includes a plurality of LEDs (Light Emitting Diodes) 41, a reflection sheet 42, a diffusion plate 43, and a diffusion sheet 44. The plurality of LEDs 41 are attached to the bottom 32a of the rear frame 32 in the space 30a with a predetermined distance D in the B direction and the C direction. Each of the plurality of LEDs 41 includes a light emitting unit 41a that directly irradiates light to the liquid crystal panel 33 side (A1 side). The LED 41 is an example of the “light emitting element” in the present invention.

  Further, the light emitting unit 41a of the LED 41 is configured to have the highest luminance (irradiate the strongest light) immediately above the light emitting unit 41a. The light emitting unit 41a is configured such that the luminance is half of the luminance immediately above the light emitting unit 41a at a position inclined by an angle α (= about 30 degrees) with respect to the straight line E passing through the light emitting unit 41a and extending to the A1 side. Has been. That is, the LED 41 is configured such that the directivity angle (2α) is about 60 degrees.

  The reflection sheet 42 is a region of the flange 32c in the space 30a of the rear frame 32 other than the region where the LED 41 of the bottom 32a is not provided, the wall 32b, and the position of the flange 31d of the front frame 31. And is arranged. The reflection sheet 42 has a function of reflecting light traveling toward the A2 side toward the A1 side.

  The diffusion plate 43 is disposed on the liquid crystal panel 33 side (A1 side) of the plurality of LEDs 41. Further, the outer edge portion of the flat surface of the diffusion plate 43 is locked to the rear frame 32 by a locking portion (not shown) of the rear frame 32. Further, the diffusion plate 43 is made of MS resin made of a copolymer of methyl methacrylate and styrene, and a large number of diffusion particles (dot portions in FIG. 3) made of titanium oxide, epoxy resin, etc. are generally formed inside. Evenly distributed. The diffusion plate 43 is configured to diffuse the light irradiated to the diffusion plate 43 over a wide range by reflecting the light irradiated from the LED 41 in various directions by a large number of diffusion particles. Thereby, the light irradiated to the diffuser plate 43 is configured to be irradiated to the A1 side in a state where the luminance is made uniform to some extent.

  Here, in 1st Embodiment, the convex part 50 which protrudes in the A2 side is formed in two or more on the LED43 side (A2 side) surface 43a of the diffusion plate 43. As shown in FIG. This convex portion 50 is a region on the surface 43a of the diffusion plate 43 excluding the vicinity of the outer edge portion, and a region immediately above the light emitting portion 41a of the LED 41 (A1 side) corresponding to the light emitting portion 41a of the LED 41. Is formed. Moreover, the convex part 50 is comprised from the surface by the side of A2 of the spherical body where the center (center of curvature) F is located on the straight line E which passes the center of the convex part 50 and extends in the thickness direction (A direction). That is, the convex part 50 is formed in the gentle curved surface shape. Moreover, the vertex 50a in which the protrusion amount to the A2 side in the convex portion 50 is maximized is formed in a region corresponding to the light emitting portion 41a of the LED 41. The surface 43a is an example of the “first surface” in the present invention, and the convex portion 50 is an example of the “first convex portion” and the “spherical surface portion” in the present invention.

  Moreover, the connection part 51 comprised from the curved surface part which has a concave shape in the A2 side is formed in the both ends of the B direction of the convex part 50, and the C direction. Moreover, the convex part 50 and the connection part 51 are integrally formed on the surface 43a of the diffusion plate 43, and are connected to each other in a gently curved shape. Thereby, the surface 43a of the diffusing plate 43 is formed with a plurality of wave shapes extending in the B direction and the C direction by connecting the plurality of convex portions 50 and the plurality of connection portions 51 in gentle curves. . The connecting portion 51 is an example of the “curved surface portion” in the present invention.

  Further, the position of the surface 43a irradiated with light inclined at an angle β (= about 45 degrees) from the center of the light emitting portion 41a of any LED 41 and the light inclined at an angle β from the center of the light emitting portion 41a of the adjacent LED 41 are irradiated. Arbitrary LEDs 41 and adjacent LEDs 41 are arranged at a predetermined interval D so that the position of the surface 43a to be substantially matched.

  In the first embodiment, a plurality of convex portions 60 projecting toward the A1 side are formed on the surface 43b of the diffusion plate 43 on the liquid crystal panel 33 side (A1 side). This convex portion 60 is a region on the surface 43b of the diffusion plate 43 excluding the vicinity of the outer edge portion, and a region immediately above the light emitting portion 41a of the LED 41 (A1 side) corresponding to the light emitting portion 41a of the LED 41. Is formed. Further, the convex portion 60 is constituted by a surface on the A1 side of a sphere centering on the center (curvature center) F. That is, the convex part 60 is formed in a gentle curved surface. Moreover, the vertex 60a where the protrusion amount to the A1 side is the maximum among the convex portions 60 is formed in a region corresponding to the light emitting portion 41a of the LED 41. The surface 43b is an example of the “second surface” in the present invention, and the convex portion 60 is an example of the “second convex portion” in the present invention.

  Moreover, the connection part 61 comprised from the curved surface part which has a concave shape in the A1 side is formed in the both ends of the B direction of the convex part 60, and the C direction. Moreover, the convex part 60 and the connection part 61 are integrally formed on the surface 43b of the diffusion plate 43, and are connected to each other in a gently curved shape. Thereby, the surface 43b of the diffusing plate 43 is formed with a plurality of wave shapes extending in the B direction and the C direction by connecting the plurality of convex portions 60 and the plurality of connecting portions 61 in a gentle curved shape. .

  Moreover, the convex part 60 and the connection part 61 are formed in the shape substantially the same as the convex part 50 and the connection part 51, respectively. Further, as shown in FIG. 4, the projection 50 and the projection 60 are formed so as to substantially overlap (overlap) when viewed in plan (from the A2 side), and the connection portion 51 and the connection portion are formed. 61 is formed so as to substantially overlap. That is, as shown in FIG. 3, the convex portion 50 and the convex portion 60 are substantially mirror-image symmetric with respect to the substantially central plane in the thickness direction (A direction) of the diffusion plate 43 as a boundary (symmetrical plane). 51 and the connection part 61 are comprised so that it may become substantially mirror-image symmetry. As a result, the surface 43a and the surface 43b of the diffusion plate 43 are configured to be substantially mirror-image symmetric.

  In addition, in the region of the surfaces 43a and 43b irradiated with light inclined at an angle β (= about 45 degrees) from the center of the light emitting part 41a, the diffusion plate 43 is configured to be substantially flat. Thereby, since it is possible to reduce the thickness of the diffusing plate 43 in the low luminance region, it is possible to suppress the diffusion of light in the low luminance region.

  Further, the diffusion plate 43 in which the convex portions 50 and 60 and the connection portions 51 and 61 are formed is integrally manufactured by injection molding or the like. Thereby, it is possible to easily manufacture the diffusion plate 43 in which the convex portions 50 and 60 and the connection portions 51 and 61 are formed.

  The diffusion sheet 44 is disposed on the A1 side of the diffusion plate 43 on the vertex 60a of the convex portion 60 of the diffusion plate 43. The diffusion sheet 44 is configured to further diffuse the light diffused in the diffusion plate 43 so as to make the luminance of the light from the LEDs 41 more uniform. As a result, the light irradiated from the LED 41 to the A1 side is configured to be irradiated to the liquid crystal panel 33 via the diffusion plate 43 and the diffusion sheet 44.

  Note that the backlight unit 40 includes an edge light type backlight that irradiates light to the liquid crystal panel 33 indirectly through the light guide plate and the diffusion plate by arranging the plurality of LEDs 41 on the side surface side of the light guide plate. In contrast, by arranging a plurality of LEDs 41 directly below the liquid crystal panel 33 and the diffusion plate 43 (A2 side), light is directly irradiated to the liquid crystal panel 33 through the diffusion plate 43 without using the light guide plate. It consists of a direct type backlight.

  In the first embodiment, as described above, the convex portions 50 and 60 are formed into gentle curved surfaces in the regions corresponding to the light emitting portions 41a of the LEDs 41 on the surfaces 43a and 43b, respectively, so that the convex portions 50 and 60 are formed. Therefore, a boundary region having a steep surface shape that hardly diffuses light in the region corresponding to the light emitting portion 41a of the LED 41 of the diffusion plate 43 is not formed. Thereby, light can be sufficiently irradiated to the liquid crystal panel 33 side by the light emitting portion 41a of the LED 41 of the light emitting element of the diffusion plate 43, so that the luminance of a part of the liquid crystal panel 33 is lowered and darker than the surroundings. Can be suppressed. As a result, the occurrence of unevenness (unevenness) in the luminance of the liquid crystal panel 33 can be suppressed.

  In the first embodiment, as described above, the convex portions 50 and 60 are formed in a gentle curved shape on the LED 41 side in a region corresponding to the light emitting portion 41a of the LED 41, and are integrated with the surfaces 43a and 43b, respectively. By forming the protrusions 50 and 60 in a gentle curved shape on the LED 41 side, and the inside of the diffusion plate 43 between the protrusions 50 and 60 containing the diffusion particles Moreover, the light irradiated to the area | region corresponding to the light emission part 41a of LED41 of the diffuser plate 43 can be diffused more widely. Thereby, since it can suppress that the area | region corresponding to the light emission part 41a of LED41 of the liquid crystal panel 33 increases and becomes brighter than another area | region, it can suppress that the brightness | luminance of the liquid crystal panel 33 is biased. Can be suppressed.

  Moreover, in 1st Embodiment, as mentioned above, the liquid crystal panel 33 side (A1 side) among the convex part 50 and the vertex 50a from which the protrusion amount to LED41 side (A2 side) becomes the maximum among the convex parts 50 are mentioned. If the vertex 60a having the maximum protrusion amount to the light emitting portion 41) is formed in the region corresponding to the light emitting portion 41a of the LED 41, the thickness of the diffusion plate 43 in the region corresponding to the light emitting portion 41a of the LED 41 is changed to the other. Since it can be made larger than the thickness of the diffusion plate 43 in the region, light can be sufficiently diffused inside the convex portions 50 and 60 containing the diffusing particles. Thereby, since the light irradiated to the area | region corresponding to the light emission part 41a of LED41 can be spread further widely, the area | region corresponding to the light emission part 41a of LED41 of the liquid crystal panel 33 becomes brighter than another area | region. Can be further suppressed.

  In the first embodiment, as described above, when the surface 43a of the diffusing plate 43 is connected to the plurality of convex portions 50 and the plurality of connecting portions 51 in a gentle curved shape, the plurality of convex portions 50 become gentle. By being connected to each other by the connecting portion 51, a boundary region having a steep surface shape that hardly diffuses light in the connecting portion 51 between the convex portions 50 is not formed. Thereby, since the light can be sufficiently irradiated to the liquid crystal panel 33 side even at the connection portion 51 between the convex portions 50 of the diffusion plate 43, the luminance of a part of the liquid crystal panel 33 is lowered and becomes darker than the surroundings. Can be suppressed. As a result, it is possible to prevent the luminance of the liquid crystal panel 33 from being biased. Further, by forming the plurality of convex portions 50 of the diffusing plate 43 in the regions corresponding to the light emitting portions 41a of the plurality of LEDs 41, the light irradiated to the regions corresponding to the light emitting portions 41a of the plurality of LEDs 41 is spread over a wide range. Can be diffused. Thereby, since it is not necessary to make LED41 adjoin, in order to obtain the brightness | luminance similar to the area | region corresponding to the light emission part 41a of LED41 also in the area | region between adjacent LED41, the number of LED41 can be reduced.

  Moreover, in 1st Embodiment, if the convex part 50 of the diffuser plate 43 is comprised from the one part surface of a spherical body as mentioned above, the light irradiated to the area | region corresponding to the light emission part 41a of LED41 will be easily extensive. Can diffuse. Moreover, if the connection part 51 comprised from the curved-surface part which has a concave shape is formed in the surface 43a of the diffusion plate 43, the convex parts 50 can be connected smoothly. As a result, it is possible to easily irradiate the liquid crystal panel 33 with light sufficiently at the connecting portion 51 between the convex portions 50 of the diffusion plate 43.

  In the first embodiment, as described above, the convex portion 50 and the convex portion 60 are substantially mirror-image symmetric with respect to the substantially central surface in the thickness direction of the diffusion plate 43 as a boundary (symmetrical surface), and the connection portion If the surface 43a and the surface 43b of the diffusing plate 43 are configured to be substantially mirror-image symmetric when the 51 and the connecting portion 61 are substantially mirror-image symmetric, the surface 43a and the surface 43b of the diffusing plate 43 are approximately Since they can have the same shape, it is not necessary to distinguish between the surface 43a and the surface 43b when the liquid crystal display device 100 is assembled. Thereby, the assembly process of the liquid crystal display device 100 can be simplified.

  In the first embodiment, as described above, the backlight unit 40 is disposed directly below the liquid crystal panel 33 and the diffusing plate 43 by the LED 41, and thus directly through the diffusing plate 43 without the light guide plate. In particular, in the case of a direct-type backlight that irradiates the liquid crystal panel 33 with light, the convex portions 50 and 60 are formed in a gentle curved surface to suppress the occurrence of bias in the luminance of the liquid crystal panel 33. be able to.

  In the first embodiment, since it is not necessary to provide a lens for diffusing the light of the LED 41 in each of the plurality of LEDs 41, the manufacturing process can be simplified.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, unlike the first embodiment, the backlight unit 240 is an edge light type backlight that indirectly irradiates the liquid crystal panel 33 with light through the light guide plate 246 and the diffusion plate 243. The case will be described.

  The liquid crystal module 230 according to the second embodiment of the present invention includes a front frame 231 and a rear frame 232 as shown in FIG. The front frame 231 has a bottom 31b having an opening 31a and a wall 31c. The rear frame 232 includes a bottom portion 32a, a wall portion 32b, and an attachment portion 232d that is provided so as to extend in the C direction between the bottom portion 32a and the wall portion 32b and to which an LED bar 245 described later is attached. ing. The mounting portion 232d is provided on the B1 side of the rear frame 232.

  The backlight unit 240 further includes an LED bar 245 and a light guide plate 246 in addition to the plurality of LEDs 41 (see FIG. 6), the reflection sheet 242, the diffusion plate 243, and the plurality of diffusion sheets 44. It is out. Further, as shown in FIG. 6, the plurality of LEDs 41 are attached to the surface of the LED bar 245 on the B2 side with a predetermined distance from each other in the C direction. The plurality of LEDs 41 are attached to the LED bar 245 so as to irradiate light to the B2 side. Further, as shown in FIG. 5, the LED bar 245 extends in the C direction in a state where the surface on the B1 side opposite to the side on which the LED 41 is mounted is in contact with the wall portion 32b of the rear frame 232. It is attached to the attachment portion 232d of the rear frame 232.

  Here, in the second embodiment, the light guide plate 246 is disposed on the liquid crystal panel 33 side (A1 side) surface of the reflection sheet 242 disposed on the bottom 32 a of the rear frame 32. At this time, the plurality of LEDs 41 mounted on the LED bar 245 are arranged such that the light emitting portion 41a is positioned at the approximate center in the thickness direction (A direction) of the side surface 246a of the light guide plate 246.

  In the second embodiment, as shown in FIG. 6, the diffusion plate 243 is attached to the side surface 246a on the B1 side of the light guide plate 246 so as to extend in the C direction. Further, a plurality of convex portions 50 projecting toward the B2 side are formed on the surface 43a of the diffusion plate 243 on the LED 41 side (B1 side). In addition, connection portions 51 are formed at both ends of the convex portion 50 in the C direction. Both the convex portion 50 and the connecting portion 51 are formed in a gently curved shape, and are connected to each other in a gently curved shape. Moreover, the vertex 50a in which the protrusion amount to the B2 side is the maximum among the convex portions 50 is disposed in a region corresponding to the light emitting portion 41a of the LED 41.

  On the other hand, unlike the first embodiment, the surface 243b opposite to the surface 43a of the diffusion plate 243 (B2 side) is formed in a flat surface shape. The surface 243b is configured to contact the side surface 246a on the B1 side of the light guide plate 246. The plurality of diffusion sheets 44 are arranged in a state of being laminated in the thickness direction (A direction) on the surface 246 b on the A1 side of the light guide plate 246.

  Thereby, in 2nd Embodiment, as shown in FIG. 5, the light irradiated to the B2 side from several LED41 is diffused through the diffusion plate 243. As shown in FIG. Then, the light diffused by the diffusion plate 243 is irradiated through the light guide plate 246 to the liquid crystal panel 33 side (A1 side) in a state where the luminance is substantially uniform. And it is comprised so that it may irradiate to the A1 side through the some diffusion sheet 44 in the state where the brightness | luminance was made more uniform. That is, in the backlight unit 240, the plurality of LEDs 41 in the first embodiment are arranged directly below the liquid crystal panel 33 and the diffusion plate 43, so that the light directly through the diffusion plate 43 without the light guide plate. Unlike a direct-type backlight that irradiates the liquid crystal panel 33, a plurality of LEDs 41 are arranged on the side surface 246 a side of the light guide plate 246, so that light is indirectly transmitted through the light guide plate 246 and the diffusion plate 243. It consists of an edge light type backlight that irradiates the panel 33. In addition, the other structure of 2nd Embodiment of this invention is the same as that of the said 1st Embodiment.

  In the second embodiment, as described above, the backlight unit 240 is configured to indirectly emit light through the light guide plate 246 and the diffusion plate 243 by arranging the plurality of LEDs 41 on the side surface 246a side of the light guide plate 246. In the case of an edge light type backlight that irradiates the liquid crystal panel 33, it is possible to suppress the occurrence of bias (unevenness) in the luminance of the liquid crystal panel 33 by forming the convex portion 50 in a gently curved shape. it can. The remaining effects of the second embodiment are similar to those of the aforementioned first embodiment.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the first embodiment, not only the convex portion 50 and the connecting portion 51 are provided on the surface 43a on the LED 41 side of the diffusion plate 43, but also the convex portion 60 and the connecting portion 61 are provided on the surface 43b on the liquid crystal panel 33 side. However, the present invention is not limited to this. For example, as in the modification of the first embodiment shown in FIG. 7, if the convex portion 50 and the connecting portion 51 are provided on the surface 43a on the LED 41 side of the diffusion plate 343, the convex portion is projected on the surface 343b on the liquid crystal panel 33 side. And the connection portion may not be provided. Accordingly, the length (thickness) in the A direction of the diffusion plate 343 can be reduced by the amount that the convex portion is not formed on the surface 343b on the liquid crystal panel 33 side, so that the liquid crystal display device can be thinned. It is.

  In the first embodiment, an example in which the convex portions 50 and 60 of the diffusing plate 43 are formed from a part of a spherical surface is shown. In the second embodiment, the convex portion 50 of the diffusing plate 243 is formed from a part of a spherical surface. However, the present invention is not limited to this. In the present invention, as long as the convex portion is formed in a gentle curved surface shape, it may not be a part of the spherical surface.

  Moreover, in the said 1st Embodiment, both the vertex 50a of the convex part 50 of the diffusion plate 43 and the vertex 60a of the convex part 60 are formed in the area | region (area | region right above the light emission part 41a of LED41) corresponding to the light emission part 41a of LED41. In the second embodiment, the vertex 50a of the convex portion 50 of the diffusion plate 243 is formed in the region corresponding to the light emitting portion 41a of the LED 41. However, the present invention is not limited to this. . In this invention, it is not necessary to form the vertex of a convex part in the area | region corresponding to the light emission part of LED. At this time, the apex of the convex portion is preferably formed in a region where the luminance of the LED is high.

  Moreover, in the said 1st and 2nd embodiment, although the example using the diffusion sheet 44 was shown, this invention is not limited to this. In the present invention, the diffusion sheet 44 may not be used as long as the luminance can be sufficiently uniformed in the diffusion plates 43 and 243.

  In the first embodiment, the LED 41 is arranged in the B direction and the C direction. In the second embodiment, the LED 41 is arranged in the C direction. The present invention is not limited to this. In the present invention, the (first) convex portion may be formed in the region corresponding to the light emitting portion of the LED on the (first) surface on the LED side of the diffusion plate, and the LEDs are irregularly arranged. May be.

  Further, in the first embodiment, the projection 50 and the projection 60 are formed so as to substantially overlap (overlap) when viewed in a plan view, and the connection portion 51 and the connection portion 61 are substantially overlapped. Although an example of forming was shown, the present invention is not limited to this. In the present invention, it is only necessary that at least a part of the convex part 50 and a part of the convex part 60 formed in the region corresponding to the light emitting part of the LED overlap each other.

  Moreover, in the said 1st and 2nd embodiment, although the diffuser plates 43 and 243 were shown about the example which consists of MS resin, this invention is not limited to this. For example, you may comprise the diffusion plates 43 and 243 so that it may consist of other resin materials, such as PS (polystyrene) resin.

  In the first and second embodiments, the “display device” of the present invention is applied to a liquid crystal television device having a TV tuner function, a liquid crystal monitor connected to a PC, or the like. The present invention is not limited to this. For example, the present invention can be applied to a liquid crystal monitor mounted on a car navigation system, an information display monitor (liquid crystal monitor) mounted in a vehicle (indoor) such as a train, bus, ship, or aircraft, or a liquid crystal monitor of a mobile phone. A “display device” may be applied.

30 Liquid crystal module (display module)
33 LCD panel (display unit)
41 LED (light emitting element)
41a Light emitting portion 43, 243, 343 Diffuser plate 43a Surface (first surface)
43b Surface (second surface)
50 convex parts (first convex part, spherical part)
51 Connection (curved surface)
60 convex part (second convex part)
100 Liquid crystal display device (display device)

Claims (9)

A display unit;
A light emitting element including a light emitting unit for irradiating the display unit with light;
A diffusing particle for diffusing light from the light-emitting portion, and protruding in a gently curved shape toward the light-emitting element side at least in a region corresponding to the light-emitting portion of the light-emitting element among the first surface on the light-emitting element side; And a diffusion plate integrally formed with the first convex portion.   The display device according to claim 1, wherein the first convex portion of the diffusion plate is formed so that a protrusion amount is maximized in a region corresponding to the light emitting portion of the light emitting element. A plurality of the light emitting elements are provided,
A plurality of the first convex portions of the diffusion plate are provided, are formed in regions corresponding to the light emitting portions of the light emitting elements, and are connected to each other by gentle curved surface portions. Item 3. The display device according to Item 1 or 2.   In the diffusing plate, a convex spherical portion formed in a region corresponding to a light emitting portion of the plurality of light emitting elements, and a concave curved surface portion formed in a region connecting the convex spherical portions, The display device according to claim 3, wherein the display devices are connected in a gently curved shape.   The diffuser plate further includes a second convex portion that protrudes to the opposite side of the light emitting element in at least a region corresponding to the light emitting part of the light emitting element, on the second surface opposite to the light emitting element. The display device according to any one of claims 1 to 4, wherein the display device is formed.   The display device according to claim 5, wherein the second convex portion of the diffusing plate is formed so that a protruding amount is maximized in a region corresponding to the light emitting portion of the light emitting element.   The said 1st convex part and the said 2nd convex part of the said diffusion plate are formed so that it may become substantially mirror-image symmetry about the approximate center of the thickness direction of the said diffusion plate as a boundary. Display device.   The light-emitting element is configured to irradiate light to the display unit without using a light guide plate through the diffusion plate in which the first convex portion is integrally formed. The display apparatus of any one of -7. A display unit;
A light emitting element including a light emitting unit for irradiating the display unit with light;
A diffusing particle for diffusing light from the light-emitting portion, and protruding in a gently curved shape toward the light-emitting element side at least in a region corresponding to the light-emitting portion of the light-emitting element among the first surface on the light-emitting element side; And a diffuser plate integrally formed with the first convex portion.

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