Display device

Abstract

Provided is a display device capable of making the unevenness in brightness of a display panel less noticeable and improving the display quality of the display device. A reflective sheet (28) is attached to the front surface of a light source substrate (22) so as to cover the head portion of a fixing member (24), and the reflective sheet (28) is formed with a bridge portion (34) spanning the head portion of the fixing member (24) by a slit (28s), the bridge portion (34) being disposed in the central portion of an area (F) surrounded by the four light sources (26) around the head portion of the fixing member (24).

Description

TECHNICAL FIELD

[0001] The present application relates to a display device such as a monitor, a television receiver, and the like, and particularly to a backlight of a display device. BACKGROUND

[0002] In a display device having a display panel that does not have a light emitting function, such as a liquid crystal display panel, a backlight that is an illuminating device for displaying an image on the display panel is used (see Patent Document 1). The structure of the backlight according to the related art will be described below.

[0003] A base (referred to as a substrate support body in Patent Document 1) is provided on the back side of the display panel. On the front surface of the base, a plurality of light source substrates (referred to as substrates in Patent Document 1) are mounted by fixing members. Each light source substrate has a plurality of light sources on its front surface that emit light toward the display panel. In addition, a reflection sheet that reflects light emitted from the light sources toward the display panel is mounted on the front surface of the base in a manner of covering the plurality of light source substrates. The reflection sheet has a plurality of opening portions (referred to as first holes in Patent Document 1) for exposing the plurality of light sources. The reflection sheet has through-holes (referred to as second holes in Patent Document 1) for the fixing members to pass through. Furthermore, in order to prevent the light emitted from the light sources from being blocked by the head portions of the fixing members, the dimension from the front surface of the substrate to the top of the head portion of the fixing member is set to be shorter than the dimension from the front surface of the substrate to the top of the light source. In addition, the reflection sheet covers a connector that connects the plurality of light source substrates, and a slit is formed in a portion of the reflection sheet corresponding to the connector.

[0004] PRIOR ART DOCUMENTS

[0005] PATENT DOCUMENTS

[0006] Patent Document 1: Japanese Patent Application Publication No. 2013-214528 SUMMARY

[0007] PROBLEMS TO BE SOLVED BY THE INVENTION

[0008] However, since the difference in light reflectance between the reflective sheet and the head of the fixing member, sometimes the dark portion of the portion of the display panel corresponding to the head of the fixing member is conspicuous. On the other hand, when the reflective sheet is attached to the front surface of the light source substrate in a manner to cover the head of the fixing member in a manner not to generate the dark portion of the portion corresponding to the head of the fixing member, the periphery of the portion of the reflective sheet covering the head of the fixing member protrudes from the front surface of the light source substrate by an amount corresponding to the thickness of the head of the fixing member. Then, as time passes, when the protrusion of the reflective sheet advances to the vicinity of the light source around the periphery of the head of the fixing member, a portion of the light emitted from the light source is blocked by the protruding portion of the reflective sheet, the brightness unevenness of the display panel is conspicuous, there is a problem that the display quality of the display device is reduced. In particular, when the arrangement pitch of the plurality of light sources becomes dense, the above-described problem becomes more conspicuous.

[0009] Therefore, an object of one aspect of the present disclosure is to make the brightness unevenness of the display panel inconspicuous, and improve the display quality of the display device.

[0010] Solution to the problem

[0011] In order to solve the above-described problem, a display device according to one aspect of the present disclosure includes: a base provided on the back surface side of a display panel that displays an image; a light source substrate mounted to the front surface of the base by a fixing member, having a plurality of light sources that emit light toward the display panel on the front surface; and a reflective sheet attached to the front surface of the light source substrate in a manner to cover the head of the fixing member, having a plurality of opening portions for exposing the plurality of light sources, and reflecting the light emitted from the light sources toward the display panel side. A bridge portion that crosses the head of the fixing member is formed (divided) by a slit on the reflective sheet, and the bridge portion is arranged to pass through the central portion of the region surrounded by four light sources among the plurality of light sources around the periphery of the head of the fixing member.

[0012] Effect of the invention

[0013] According to one aspect of the present disclosure, the brightness unevenness of the display panel can be made inconspicuous, and the display quality of the display device can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a schematic front view of a display device according to a first embodiment of the present disclosure.

[0015] Figure 2 is a schematic cross-sectional view along the line II-II in Figure 1 .

[0016] Figure 3 is a schematic partial front view showing the case where the reflective sheet having a bridge portion according to the first embodiment of the present disclosure is attached to the light source substrate.

[0017] Figure 4A is Figure 3 an enlarged view of IVA in

[0018] Figure 4B is a schematic cross-sectional view along the IVB-IVB line of Figure 4A

[0019] Figure 5 is a schematic partial front view showing a case where the reflective sheet having a bridge portion according to the second embodiment of the present application is attached to a light source substrate.

[0020] Figure 6A is an enlarged view of VIA in Figure 5

[0021] Figure 6B is a schematic cross-sectional view along the VIB-VIB line of Figure 6A

[0022] Figure 7 is a schematic partial front view showing a case where the reflective sheet having a bridge portion according to the third embodiment of the present application is attached to a light source substrate.

[0023] Figure 8A is an enlarged view of VIIIA in Figure 7

[0024] Figure 8B is a schematic cross-sectional view along the VIIIB-VIIIB line of Figure 8A DETAILED DESCRIPTION

[0025] Hereinafter, an embodiment of the present disclosure will be described with reference to the accompanying drawings. As recited in the drawings, with a state where a display device is standing as a reference, a front side of the display device is referred to as a front side, a back side of the display device is referred to as a back side, one side in a width direction of the display device is referred to as a left side, the other side in the width direction of the display device is referred to as a right side, one side in a height direction of the display device is referred to as an upper side, and the other side in the height direction of the display device is referred to as a lower side.

[0026] [First Embodiment]

[0027] With reference to Figures 1 to 5 , an embodiment of the present disclosure will be described. Figure 1 is a schematic front view of a display device according to the first embodiment of the present disclosure. Figure 2 is a schematic cross-sectional view along the II-II line of Figure 1 Figure 3 is a schematic partial front view showing a case where the reflective sheet having a bridge portion according to the first embodiment of the present application is attached to a light source substrate. Figure 4A ​​​​​​is Figure 3 An enlarged view of IVA. Figure 4B is a schematic cross-sectional view along Figure 4A IVB-IVB line.

[0028] (Outline of display device 10) As Figure 1 and Figure 2 shown, the display device 10 according to the first embodiment of the present disclosure is used, for example, for a monitor display or a television receiver, and the like. The display device 10 is provided with a rectangular display panel 12 that displays an image, the display panel 12 extending in the left-right direction (width direction). The display panel 12 is a liquid crystal panel that encloses liquid crystal (not shown) between an array substrate (not shown) and a color filter substrate (not shown), and does not have a light-emitting function.

[0029] The display device 10 is provided with a frame 14 that holds a rectangular frame shape in a manner of surrounding the display panel 12, the frame 14 being composed of, for example, a metal such as aluminum or a synthetic resin. In addition, the display device 10 is provided with a case 16 that is provided in a manner of covering the back surface side of the display panel 12, the case 16 being fixed to the frame 14. The case 16 is composed of, for example, a metal such as aluminum or a synthetic resin. Furthermore, the display device 10 is provided with a backlight 18 that is disposed between the display panel 12 and the case 16. The backlight 18 is an illumination device for displaying an image on the display panel 12.

[0030] Next, the specific structure of the backlight 18 will be described.

[0031] (Base 20) As Figure 2 shown, a base 20 is provided on the back surface side of the display panel 12, the base 20 being fixed to the frame 14. The base 20 is composed of, for example, a metal such as aluminum or iron.

[0032] (Light source substrate 22, light-emitting diode 26) As Figure 2 , Figure 3 shown, a rectangular light source substrate 22 is mounted on the front surface (front surface) of the base 20 by a plurality of screws 24 as a plurality of fixing members. The light source substrate 22 has a plurality of light-emitting diodes 26 as a plurality of light sources that irradiate light to the display panel 12 on the front surface thereof. The front surface view shape of each light-emitting diode 26 is a rectangular shape, and the plurality of light-emitting diodes 26 are arranged in a matrix shape. The arrangement pitch Pa in the left-right direction (width direction) and the arrangement pitch Pb in the up-down direction (height direction) of the plurality of light-emitting diodes 26 are, for example, 10 mm, respectively. The outer diameter D of the maximum width of the head of the screw 24 is, for example, 5.5 mm. In addition, instead of using the screw 24 as the fixing member, a fixing member other than the screw, such as a rivet, can be used. Instead of making the front surface view shape of each light-emitting diode 26 a rectangular shape, a square shape or a circular shape can be provided.

[0033] (Reflective sheet 28) As shown in Figure 2 and Figure 3 , a plurality of rectangular reflective sheets 28 are attached to the front surface of the light source substrate 22 so as to cover the heads of the plurality of screws 24. Each reflective sheet 28 is composed of, for example, foamed white PET. Foamed white PET refers to white PET (polyethylene terephthalate) to which white pigment is added, and the surface of which is porous. The thickness of each reflective sheet 28 is, for example, 0.1 mm or more and 0.3 mm or less.

[0034] As shown in Figure 2 , Figure 3 and Figure 4A , each reflective sheet 28 has a plurality of opening portions 28a for exposing the plurality of light emitting diodes 26. The front surface view shape of each opening portion 28a of each reflective sheet 28 is a rectangular shape, and the plurality of opening portions 28a of each reflective sheet 28 are arranged in a matrix shape. The gap between each opening portion 28a of each reflective sheet 28 and the corresponding light emitting diode 26 is a gap for securing the attachment tolerance of each reflective sheet 28, and is, for example, 0.5 mm. Instead of the rectangular shape, the front surface view shape of each opening portion 28a of each reflective sheet 28 can be a square shape or a circular shape.

[0035] (Diffusion plate 30, optical sheet 32) As shown in Figure 2 , a rectangular diffusion plate 30 that diffuses light emitted from the plurality of light emitting diodes 26 in the surface direction is provided between the display panel 12 and the light source substrate 22. In addition, an optical sheet 32 in a rectangular shape that makes the advancing direction of the diffused light toward the display panel 12 side is provided between the diffusion plate 30 and the display panel 12. The optical sheet 32 includes at least one sheet of a diffusion sheet, a lens sheet, and a reflective polarizing sheet.

[0036] (Bridge portion 34) As shown in Figure 3 , FIG. 4, and Figure 4B , a plurality of bridge portions 34 that span the heads of the plurality of screws 24 are formed (divided and formed) on each reflective sheet 28 by a slit 28s. The front surface view shape of each bridge portion 34 is an I-shaped shape. When a portion of the reflective sheet 28 other than the bridge portion 34 is referred to as a reflective sheet main body, each bridge portion 34 is connected to the reflective sheet main body at an end portion thereof. Each bridge portion 34 is arranged so as to pass through the central portion of a region F surrounded by four light emitting diodes 26 in the plurality of light emitting diodes 26 that are located closest to the head of each screw 24. The four light emitting diodes 26 in the vicinity of the head of each screw 24 refer to four light emitting diodes 26 in the plurality of light emitting diodes 26 that are located closest to the head of each screw 24.

[0037] (Bridge central portion 34a) As shown in Figure 4A and Figure 4BAs shown, each bridge portion 34 has a central portion 34a that is in close contact (attached) to the head of each screw 24. Each central portion 34a is located in the center of an area F surrounded by four light-emitting diodes 26 surrounding the head of each screw 24. The maximum width Wa of each central portion 34a is larger than the outer diameter D of the screw 24 head, for example, 6.5 mm. Most of each central portion 34a is in close contact with the head of each screw 24, while the remaining portion of each central portion 34a protrudes from the front of the light source substrate 22.

[0038] (Bridge edge 34b) as follows Figure 4A and Figure 4B As shown, each bridge portion 34 has bridge edge portions 34b formed on the left and right sides (both sides in the width direction) of the bridge center portion 34a. That is, the bridge edge portions 34b are formed on both sides of the bridge center portion 34a in at least one direction, namely the left and right direction. Each bridge portion 34 is connected to the reflector body at each end of the two bridge edge portions 34b. Each bridge edge portion 34b is disposed in the middle of the two light-emitting diodes 26 around the head of each screw 24 among the plurality of light-emitting diodes 26. The two light-emitting diodes 26 around the head of each screw 24 refer to two of the four light-emitting diodes 26 located closest to the head of each screw 24 (in this embodiment, two light-emitting diodes 26 adjacent in the vertical direction). The portion of each bridge edge portion 34b near the bridge center portion 34a protrudes from the front side of the light source substrate 22. The portion of each bridge edge portion 34b near the end does not protrude from the front side of the light source substrate 22, but may also protrude from the front side of the light source substrate 22.

[0039] like Figure 4A As shown, the width Wb of each bridge edge 34b is smaller than the width Wa of the bridge center 34a. Furthermore, the width Wb of each bridge edge 34b is more than 1 / 3 and less than 2 / 3 of the outer diameter D of the screw head. The width Wb of each bridge edge 34b is set to more than 1 / 3 of the outer diameter D of the screw head because if it is less than 1 / 3, each bridge edge 34b is prone to breakage. The width Wb of each bridge edge 34b is set to less than 2 / 3 of the outer diameter D of the screw head because it is difficult to sufficiently ensure the distance between each bridge edge 34b and the light-emitting diodes 26 around the head of the screw 24.

[0040] like Figure 4AAs shown, the length M from the head of each screw 24 to the end of each bridge edge portion 34b is greater than the outer diameter D of the head of the screw 24 and is 3 times or less the outer diameter D of the head of the screw 24. The length M to the end of each bridge edge portion 34b is set to be greater than the outer diameter D of the head of the screw 24 because if it is below the outer diameter D of the head of the screw 24, the bulging of the reflective sheet 28 can advance beyond the bridge portion 34. The length M to the end of each bridge edge portion 34b is set to be 3 times or less the outer diameter D of the head of the screw 24 because if it exceeds 3 times, when the reflective sheet 28 is attached to the front surface of the light source substrate 22, the bridge central portion 34a becomes likely to be misaligned with respect to the center of the head of the screw 24.

[0041] (Action effects of the first embodiment) Next, the action effects of the first embodiment of the present disclosure are described.

[0042] In the first embodiment of the present disclosure, as described above, each reflective sheet 28 is formed (divided to be formed) with a plurality of bridge portions 34 that span the head of each screw 24 through a slit 28s. Each bridge portion 34 is arranged to pass through the central portion of the region F surrounded by the four light emitting diodes 26 around the head of each screw 24. Each bridge edge portion 34b is arranged in the middle of two light emitting diodes 26 around the head of each screw 24 among the plurality of light emitting diodes 26, respectively. Therefore, even if the reflective sheet 28 bulges from the front surface of the light source substrate 22 to the end side of the bridge edge portion 34b, it is possible to prevent the reflective sheet 28 from advancing beyond the bridge portion 34.

[0043] Therefore, according to the first embodiment of the present disclosure, it is possible to prevent the bulging of the reflective sheet 28 from advancing to the vicinity of the light emitting diode 26 around the head of the screw 24. Therefore, according to the first embodiment of the present disclosure, it is possible to improve the display quality of the display device 10 without making the luminance unevenness of the display panel 12 obvious.

[0044] In particular, as described above, since the width Wb of each bridge edge portion 34b is smaller than the width Wa of the bridge central portion 34a, it is possible to sufficiently secure the distance of each bridge edge portion 34b from the light emitting diode 26 around the head of the screw 24. Thus, according to the first embodiment of the present disclosure, it is possible to sufficiently prevent the bulging of the reflective sheet 28 from advancing to the vicinity of the light emitting diode 26 around the head of the screw 24.

[0045] In addition, the width Wb of each bridge edge portion 34b is set to be 1 / 3 or more and 2 / 3 or less of the outer diameter D of the head of the screw 24. Therefore, according to the first embodiment of the present disclosure, each bridge edge portion 34b is difficult to be damaged, and it is possible to sufficiently prevent the bulging of the reflective sheet 28 from advancing to the vicinity of the light emitting diode 26 around the head of the screw 24.

[0046] Furthermore, in the first embodiment of this disclosure, as previously described, the front view shape of each bridge portion 34 is I-shaped. Therefore, according to the first embodiment of this disclosure, each bridge portion 34 has a simple shape, which simplifies the structure of the display device 10.

[0047] Furthermore, in the first embodiment of this disclosure, as previously described, the length M from the head of each screw 24 to the end of each bridge edge 34b is greater than the outer diameter D of the screw 24 head and less than three times the outer diameter D of the screw 24 head. Therefore, according to the first embodiment of this disclosure, positional offset of the bridge center portion 34a relative to the center of the screw 24 head can be suppressed, and the reflector 28 can be easily attached to the front side of the light source substrate 22.

[0048] [Second Implementation]

[0049] Reference Figure 5 , Figure 6A as well as Figure 6B The second embodiment of this disclosure will be described. Figure 5 This is a schematic partial front view showing the case where the reflective sheet with a bridge portion according to the second embodiment of the present invention is attached to a light source substrate. Figure 6A yes Figure 5 A magnified view of VIA in the image. Figure 6B It is along Figure 6A A schematic cross-sectional view of the VIB-VIB line.

[0050] (Bridge section 36) such as Figure 5 As shown in Figure 6, in the second embodiment of this disclosure, instead of forming bridge portions 34 on each reflector 28 (see Figure 6), Figure 3 and Figure 5 The slits 28s form (divide) multiple bridge portions 36 across the heads of each screw 24. The front view shape of each bridge portion 36 is cross-shaped. Each bridge portion 36 is configured to pass through the central portion of the region F surrounded by four light-emitting diodes 26 surrounding the heads of each screw 24.

[0051] (Central part of the bridge 36a) as follows Figure 6A and Figure 6B As shown, each bridge portion 36 has a central portion 36a that is in close contact (attached) to the head of each screw 24. Each bridge central portion 36a is located in the center of an area F surrounded by four light-emitting diodes 26 surrounding the head of each screw 24. The maximum width Wa of each bridge central portion 36a is a value larger than the outer diameter D of the screw 24 head, for example, 6.5 mm. Most of each bridge central portion 36a is in close contact with the head of each screw 24, and the remaining portion of each bridge central portion 36a protrudes from the front side of the light source substrate 22.

[0052] (bridge edge portion 36b) As shown in Figure 6A and Figure 6B Each bridge portion 36 has bridge edge portions 36b formed on both sides (width direction sides) and upper and lower sides (height direction sides) of the bridge central portion 36a, respectively. Each bridge portion 36 is connected to the reflector body at the end portions of the two bridge edge portions 36b. Each bridge edge portion 36b is disposed in the middle of two light emitting diodes 26 in the periphery of the head portion of each screw 24 among the plurality of light emitting diodes 26. The bridge edge portions 36b formed on both sides (width direction sides) of the bridge central portion 34a are disposed in the middle of two light emitting diodes 26 adjacent in the vertical direction. The bridge edge portions 36b formed on the upper and lower sides (height direction sides) of the bridge central portion 34a are disposed in the middle of two light emitting diodes 26 adjacent in the horizontal direction. The portions of each bridge edge portion 36b close to the bridge central portion 36a are raised from the front surface of the light source substrate 22. The portions of each bridge edge portion 36b close to the end portions are not raised from the front surface of the light source substrate 22, but can be raised from the front surface of the light source substrate 22.

[0053] As shown in Figure 6A , the width Wb of each bridge edge portion 36b is smaller than the width Wa of the bridge central portion 34a. In addition, the width Wb of each bridge edge portion 36b is 1 / 3 or more and 2 / 3 or less of the outer diameter D of the head portion of the screw 24. The reason for this setting is the same as the reason for setting the width Wb of each bridge edge portion 34b (refer to Figure 4A ). Furthermore, the length M from the head portion of each screw 24 to the end portion of each bridge edge portion 36b is larger than the outer diameter D of the head portion of the screw 24 and is 3 times or less of the outer diameter D of the head portion of the screw 24. The reason for this setting is the same as the reason for setting the length M from the head portion of each screw 24 to the end portion of each bridge edge portion 34b.

[0054] (Action effects of the second embodiment) Next, the action effects of the second embodiment of the present disclosure will be described.

[0055] In the second embodiment of the present disclosure, as described above, each reflector sheet 28 is formed (divided and formed) with a plurality of bridge portions 36 that span the head portions of each screw 24 by the slits 28s. Each bridge portion 36 is disposed so as to pass through the central portion of the region F surrounded by the four light emitting diodes 26 in the periphery of the head portion of each screw 24. Each bridge edge portion 36b is disposed in the middle of two light emitting diodes 26 in the periphery of the head portion of each screw 24 among the plurality of light emitting diodes 26. Therefore, even if the reflector sheet 28 is raised from the front surface of the light source substrate 22 to the end portion side of the bridge edge portion 36b, it is possible to prevent the reflector sheet 28 from advancing beyond the bridge portion 36.

[0056] Therefore, according to the second embodiment of the present disclosure, as with the first embodiment of the present disclosure, it is possible to prevent the protrusions of the reflective sheet 28 from advancing to the vicinity of the light-emitting diode 26 around the head periphery of the screw 24. Therefore, according to the second embodiment of the present disclosure, it is possible to improve the display quality of the display device 10 without making the luminance unevenness of the display panel 12 conspicuous.

[0057] In particular, as described above, since the width Wb of each bridge edge portion 36b is smaller than the width Wa of the bridge central portion 36a, it is possible to sufficiently ensure the distance of each bridge edge portion 36b from the light-emitting diode 26 around the head periphery of the screw 24. Thus, according to the second embodiment of the present disclosure, it is possible to sufficiently prevent the protrusions of the reflective sheet 28 from advancing to the vicinity of the light-emitting diode 26 around the head periphery of the screw 24.

[0058] In addition, as described above, the width Wb of each bridge edge portion 36b is set to be greater than or equal to 1 / 3 of the outer diameter D of the head of the screw 24 and less than or equal to 2 / 3 of the outer diameter D of the head of the screw 24. Therefore, according to the second embodiment of the present disclosure, each bridge edge portion 36b is difficult to be damaged, and it is possible to sufficiently prevent the protrusions of the reflective sheet 28 from advancing to the vicinity of the light-emitting diode 26 around the head periphery of the screw 24.

[0059] Further, in the second embodiment of the present disclosure, as described above, the front surface view shape of each bridge portion 36 is a cross shape. In addition, the length M from the head of each screw 24 to the end portion of each bridge edge portion 36b is greater than the outer diameter D of the head of the screw 24 and is less than or equal to 3 times the outer diameter D of the head of the screw 24. Therefore, according to the second embodiment of the present disclosure, it is possible to suppress the positional deviation of the bridge central portion 36a with respect to the center of the head of the screw 24, and it is possible to easily attach the reflective sheet 28 to the front surface of the light source substrate 22.

[0060] [Third Embodiment]

[0061] Reference Figure 7 , Figure 8A and Figure 8B The third embodiment of the present disclosure will be described. Figure 7 is a schematic partial front view illustrating a case where the reflective sheet having a bridge portion according to the third embodiment of the present disclosure is attached to a light source substrate. Figure 8A is Figure 7 is an enlarged view of VIIIA in Figure 8B is a schematic cross-sectional view along the VIIIB-VIIIB line of Figure 8A .

[0062] (bridge portion 38) As shown in Figure 7 and Figure 8A , in the third embodiment of the present disclosure, instead of forming the bridge portion 34 on each reflective sheet 28 (refer to Figure 3 andFigure 5 ), and a plurality of bridge portions 38 across the heads of the respective screws 24 are formed (divided to be formed) by the slits 28s. The front surface shape of each bridge portion 38 is an H-shaped shape. Each bridge portion 38 is disposed at the central portion of the region F surrounded by the four light emitting diodes 26 of the periphery of the head of each screw 24 among the plurality of light emitting diodes 26. The H-shaped shape is not limited to a strict H-shaped shape, and is intended to include a shape similar to the H-shaped shape.

[0063] As shown in Figure 8A and Figure 8B , each bridge portion 38 has a bridge central portion 38a which is in close contact (adhered) with the head of each screw 24. Each bridge central portion 38a is disposed at the central portion of the region F surrounded by the four light emitting diodes 26 of the periphery of the head of each screw 24. The maximum width Wa of each bridge central portion 38a is a value larger than the outer diameter D of the head of the screw 24, for example, 6.5 mm. Most of each bridge central portion 38a is in close contact with the head of each screw 24, and the remaining portion of each bridge central portion 38a is away from the front surface of the light source substrate 22 and is raised.

[0064] As shown in Figure 8A and Figure 8B , each bridge portion 38 has a bridge side portion 38b which is formed on each of the left and right sides (width direction sides) of the bridge central portion 38a. Each bridge side portion 38b is disposed at the middle of the two light emitting diodes 26 (two light emitting diodes 26 adjacent in the up-down direction) of the periphery of the head of each screw 24 among the plurality of light emitting diodes 26. The portion of each bridge side portion 38b which is closer to the bridge central portion 38a is away from the front surface of the light source substrate 22 and is raised. The portion of each bridge side portion 38b which is farther from the bridge central portion 38a can also be away from the front surface of the light source substrate 22 and be raised. The portion of each bridge side portion 38b which is close to the end portion is not raised from the front surface of the light source substrate 22, but can also be raised from the front surface of the light source substrate 22.

[0065] The width Wb of each bridge side portion 38b is smaller than the width Wa of the bridge central portion 38a. In addition, the width Wb of each bridge side portion 38b is 1 / 3 or more of the outer diameter D of the head of the screw 24 and 2 / 3 or less of the outer diameter D of the head of the screw 24. The reason for this setting is the same as the reason for setting the width Wb of each bridge side portion 34b (refer to Figure 3 and Figure 4A ).

[0066] As shown in Figure 8A and Figure 8BAs shown, each bridge portion 38 has two bridge branch portions 38c branched into two at the end of each bridge edge portion 38b. Each bridge portion 38 is connected to the reflector main body at the end of each of the four bridge branch portions 38c (the end on the side opposite the bridge edge portion 38b). Each bridge branch portion 38c is in close contact with the front surface of the light source substrate 22. The portion of each bridge branch portion 38c on the side closer to the bridge edge portion 38b can also be raised away from the front surface of the light source substrate 22.

[0067] The width Wc of each bridge branch portion 38c is the same degree as the width of each bridge edge portion 38b and is smaller than the width Wa of the bridge central portion 38a. In addition, the width Wc of each bridge branch portion 38c is 1 / 3 or more of the outer diameter D of the head of the screw 24 and 2 / 3 or less of the outer diameter D of the head of the screw 24. The interval R of the ends of the two bridge branch portions 38c branched from one bridge edge portion 38b is about twice the outer diameter D of the head of the screw 24, for example, 15 mm.

[0068] The length L from the head of each screw 24 to the end of each bridge branch portion 38c is greater than the outer diameter D of the head of the screw 24 and is 3 times or less of the outer diameter D of the head of the screw 24. The length L to the end of each bridge branch portion 38c is set to be greater than the outer diameter D of the head of the screw 24 because if it is the same as or less than the outer diameter D of the head of the screw 24, the raising of the reflector 28 can advance beyond the bridge portion 38. The length M to the end of each bridge branch portion 38c is set to be 3 times or less of the outer diameter D of the head of the screw 24 because if it exceeds 3 times, when the reflector 28 is attached to the front surface of the light source substrate 22, the bridge central portion 38a becomes likely to be misaligned with respect to the center of the head of the screw 24.

[0069] Next, the effects of the third embodiment of the present disclosure will be described.

[0070] In the third embodiment of the present disclosure, as described above, each reflector 28 is formed with a plurality of bridge portions 38 that span the head of each screw 24 through the slit 28s. Each bridge portion 38 is disposed through the central portion of the region F surrounded by the four light emitting diodes 26 around the head of each screw 24. Each bridge edge portion 38b is disposed in the middle of two light emitting diodes 26 around the head of each screw 24 among the plurality of light emitting diodes 26. At the end of each bridge edge portion 38b, two bridge branch portions 38c are branched into two. Therefore, the end side of each bridge edge portion 38b can be brought into sufficient close contact (attachment) with the front surface of the light source substrate 22, and the raising of the reflector 28 from the front surface of the light source substrate 22 is difficult to advance to the end side of the bridge edge portion 38b. Even if the raising of the reflector 28 advances to the end side of the bridge edge portion 38b, it can be prevented from advancing in the direction beyond the bridge portion 38.

[0071] Therefore, according to the third embodiment of the present disclosure, as with the first embodiment of the present disclosure, it is possible to prevent the protrusions of the reflective sheet 28 from advancing to the vicinity of the light-emitting diodes 26 around the head periphery of the screw 24. Therefore, according to the third embodiment of the present disclosure, it is possible to improve the display quality of the display device 10 without making the luminance unevenness of the display panel 12 conspicuous.

[0072] In particular, as described above, since the width Wb of each bridge edge portion 38b is smaller than the width Wa of the bridge central portion 36a, it is possible to sufficiently ensure the distance of each bridge edge portion 38b from the light-emitting diodes 26 around the head periphery of the screw 24. Thus, according to the third embodiment of the present disclosure, it is possible to sufficiently prevent the protrusions of the reflective sheet 28 from advancing to the vicinity of the light-emitting diodes 26 around the head periphery of the screw 24.

[0073] In addition, as described above, the width Wb of each bridge edge portion 38b and the width Wc of each bridge support portion 38c are set to be greater than or equal to 1 / 3 of the outer diameter D of the head of the screw 24 and less than or equal to 2 / 3 of the outer diameter D of the head of the screw 24. Therefore, according to the third embodiment of the present disclosure, the bridge portion 38 is difficult to be broken, and it is possible to sufficiently prevent the protrusions of the reflective sheet 28 from advancing to the vicinity of the light-emitting diodes 26 around the head periphery of the screw 24.

[0074] Further, in the third embodiment of the present disclosure, as described above, the front surface view shape H of each bridge portion 38 is a shape. In addition, the length L from the head of each screw 24 to the end of each bridge support portion 38c is greater than the outer diameter D of the head of the screw 24 and is less than or equal to 3 times the outer diameter D of the head of the screw 24. Therefore, according to the third embodiment of the present disclosure, it is possible to suppress the positional deviation of the bridge central portion 36a with respect to the center of the head of the screw 24, and it is possible to easily attach the reflective sheet 28 to the front surface of the light source substrate 22.

[0075] [Summary] The display device according to Mode 1 of the present disclosure includes: a base provided on the back surface side of a display panel that displays an image; a light source substrate mounted to the front surface of the base by a fixing member, the light source substrate having a plurality of light sources that irradiate light to the display panel on the front surface; and a reflective sheet attached to the front surface of the light source substrate so as to cover the head of the fixing member, the reflective sheet having a plurality of opening portions for exposing the plurality of light sources, and reflecting the light irradiated from the light sources to the display panel side. A bridge portion that crosses the head of the fixing member is formed (divided) by a slit on the reflective sheet, the bridge portion being arranged at a central portion of an area surrounded by four light sources among the plurality of light sources around the head periphery of the fixing member.

[0076] According to the above configuration, as described above, the bridge portion crossing the head portion of the fixing member is formed by the slit in the reflective sheet. The bridge portion is configured to pass through a central portion of a region surrounded by four light sources of the plurality of light sources among which the head portion of the fixing member is present. Therefore, it is possible to prevent the reflective sheet from protruding from the front surface of the light source substrate to outside of the bridge portion. Thus, it is possible to suppress the protrusion of the reflective sheet from advancing to the vicinity of the light source around the head portion of the fixing member. Therefore, it is possible to make the luminance unevenness of the display panel less noticeable, and to improve the display quality of the display device.

[0077] In the display device according to Mode 2 of the present disclosure, in the display device according to Mode 1, the bridge portion can have a bridge central portion configured to pass through a central portion of a region surrounded by four light sources of the plurality of light sources among which the head portion of the fixing member is present, and contact the head portion of the fixing member, and at least two bridge side portions respectively formed on both sides of the bridge central portion in at least one direction, and respectively configured to be present between two light sources of the plurality of light sources around the head portion of the fixing member.

[0078] According to the above configuration, even if the protrusion of the reflective sheet generated when the reflective sheet is attached to the front surface of the light source substrate advances to the end portion side of the bridge side portion, it is possible to prevent the advance to outside of the bridge portion.

[0079] In the display device according to Mode 3 of the present disclosure, in the display device according to Mode 2, the bridge portion can further have two bridge branch portions which are branched in a two-branch shape at the end portion of each bridge side portion.

[0080] According to the above configuration, it is possible to sufficiently adhere (attach) the end portion side of each bridge side portion to the front surface of the light source substrate, and it is difficult for the protrusion of the reflective sheet to advance to the end portion side of the bridge side portion.

[0081] In the display device according to Mode 4 of the present disclosure, in any one of Modes 1 to 3, the bridge portion can have two bridge side portions, and the front surface view shape of the bridge portion can be an I-shaped shape.

[0082] According to the above configuration, the bridge portion becomes a simple shape, and it is possible to achieve simplification of the structure of the display device.

[0083] In the display device according to Mode 5 of the present disclosure, in any one of Modes 1 to 3, the bridge portion can have four bridge side portions including two bridge side portions respectively formed on both sides of the bridge central portion in a first direction, and two bridge side portions respectively formed on both sides of the bridge central portion in a second direction substantially orthogonal to the first direction, and the front surface view shape of the bridge portion can be a cross-shaped shape.

[0084] According to the above configuration, the position of the bridge central portion relative to the center of the head of the fixing member is inhibited from shifting, and the reflective sheet can be easily attached to the front surface of the light source substrate.

[0085] In any of the above-described modes 1 to 3, the display device according to mode 6 of the present disclosure can be such that the bridge portion has two bridge side portions, and the front surface view shape of the bridge portion is H-shaped.

[0086] According to the above configuration, the position of the bridge central portion relative to the center of the head of the fixing member is inhibited from shifting, and the reflective sheet can be easily attached to the front surface of the light source substrate.

[0087] In any of the above-described modes 2 to 6, the display device according to mode 7 of the present disclosure can be such that the width of the bridge side portion is smaller than the maximum width of the bridge central portion.

[0088] According to the above configuration, the position of the bridge central portion relative to the center of the head of the fixing member is inhibited from shifting, and the reflective sheet can be easily attached to the front surface of the light source substrate.

[0089] In any of the above-described modes 2 to 7, the display device according to mode 8 of the present disclosure can be such that the width of the bridge side portion is greater than or equal to 1 / 3 of the maximum width of the head of the fixing member and less than or equal to 2 / 3 of the maximum width of the head of the fixing member.

[0090] According to the above configuration, the position of the bridge central portion relative to the center of the head of the fixing member is inhibited from shifting, and the reflective sheet can be easily attached to the front surface of the light source substrate.

[0091] In any of the above-described modes 2 to 8, the display device according to mode 9 of the present disclosure can be such that the length from the head of the fixing member to the end of each bridge side portion is greater than the maximum width of the head of the fixing member and less than or equal to 3 times the maximum width of the head of the fixing member.

[0092] According to the above configuration, the position of the bridge central portion relative to the center of the head of the fixing member is inhibited from shifting, and the reflective sheet can be easily attached to the front surface of the light source substrate.

[0093] In the above-described mode 3, the display device according to mode 10 of the present disclosure can be such that the length from the head of the fixing member to the end of each bridge side portion is greater than the maximum width of the head of the fixing member and less than or equal to 3 times the maximum width of the head of the fixing member.

[0094] According to the above configuration, the position of the bridge central portion relative to the center of the head of the fixing member is inhibited from shifting, and the reflective sheet can be easily attached to the front surface of the light source substrate.

[0095] [ADDITIONAL DESCRIPTION]

[0096] The present disclosure is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims, and embodiments obtained by appropriately combining the technical means disclosed in the respective embodiments are also included in the technical scope of the present disclosure.

[0097] REFERENCE NUMERALS

[0098] 10 display device

[0099] 12 display panel

[0100] 14 frame

[0101] 16 cabinet

[0102] 18 backlight

[0103] 20 base

[0104] 22 light source substrate

[0105] 24 screw (fixing member)

[0106] 26 light emitting diode (light source)

[0107] 28 reflective sheet

[0108] 28a opening portion

[0109] 28s slit

[0110] 30 diffusion plate

[0111] 32 optical sheet

[0112] 34, 36, 38 bridge portion

[0113] 34a, 36a, 38a bridge central portion

[0114] 34b, 36b, 38b bridge edge portion

Claims

1. A display device, characterized by comprising: Possessing: a base provided on a back surface side of a display panel that displays an image; a light source substrate mounted to a front surface of the base by a fixing member, having a plurality of light sources that irradiate light to the display panel on the front surface; and a reflection sheet that is attached to the front surface of the light source substrate so as to cover a head portion of the fixing member, has a plurality of opening portions for exposing the plurality of light sources, and reflects light irradiated from the light sources to the display panel side, the reflection sheet has a bridge portion divided by a slit, the bridge portion crosses over the head portion of the fixing member, and is disposed at a central portion of a region surrounded by four light sources of the plurality of light sources that are adjacent to the head portion of the fixing member.

2. The display device according to claim 1, wherein the bridge portion has: a bridge central portion disposed at the central portion of the region surrounded by the four light sources of the plurality of light sources that are adjacent to the head portion of the fixing member, and in contact with the head portion of the fixing member; and at least two bridge side portions respectively formed on both sides of the bridge central portion in at least one direction, and respectively disposed at intermediate portions of two light sources of the plurality of light sources that are adjacent to the head portion of the fixing member. The bridge portion further has two bridge branch portions that branch in two from end portions of the bridge side portions.

3. The display device of claim 2, wherein, The bridge portion has two bridge side portions, 4. The display device of claim 2, wherein a front surface view shape of the bridge portion is an I-shaped shape. The bridge portion has four bridge side portions including two bridge side portions respectively formed on both sides of the bridge central portion in a first direction, and two bridge side portions respectively formed on both sides of the bridge central portion in a second direction that is substantially orthogonal to the first direction, 5. The display device of claim 2, wherein, a front surface view shape of the bridge portion is a cross-shaped shape. The bridge portion has two bridge side portions, 6. The display device of claim 3, wherein, a front surface view shape of the bridge portion is an H-shaped shape. A width of the bridge side portion is smaller than a maximum width of the bridge central portion.

7. The display device according to any one of claims 2 to 6, wherein The width of the bridge side portion is 1 / 3 or more and 2 / 3 or less of the maximum width of the head portion of the fixing member.

8. The display device of any one of claims 2 to 6, wherein, A length from the head portion of the fixing member to an end portion of each bridge side portion is greater than the maximum width of the head portion of the fixing member and is 3 times or less of the maximum width of the head portion of the fixing member.

9. The display device of any one of claims 2 to 6, wherein, A length from the head portion of the fixing member to an end portion of each bridge branch portion is greater than the maximum width of the head portion of the fixing member and is 3 times or less of the maximum width of the head portion of the fixing member.

10. The display device according to claim 3 or 6, wherein ​

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