Display unit and display device

Abstract

To provide a display unit that can easily be removed from a support member or attached to the support member, and a display device equipped with this display unit.SOLUTION: In a display unit 800, a display body part 500 assumes displaying a video. A unit case 600 is fixed to a support member 911 in the state in which the display body part 500 is held in place. The unit case 600 includes a case bottom plate part 610 interposed between the display body part 500 and the support member 911. A fixing hole 610a is formed in the case bottom plate part 610 through which a fixture SC for fixing the case bottom plate part 610 to the support member 911 is inserted. An access hole 510 for a tool to reach, from the outside, the fixing hole 610a or the fixture SC inserted into the fixing hole 610a is formed in the display body part 500.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to a display unit and a display device. [Background technology]

[0002] As disclosed in Patent Document 1, a display device is known that includes a plurality of display units each of which displays an image. The plurality of display units are arranged in a matrix and fixed to a support housing that serves as a support member. The plurality of display units arranged in a matrix form a single display screen as a whole.

[0003] Each display unit includes a display main body that displays an image and a unit case that holds the display main body. The unit case is interposed between the display main body and the support housing. The unit case is fixed to the support housing by screws as fasteners. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-76756 Summary of the Invention [Problem to be solved by the invention]

[0005] In conventional display units, the screws for fixing the unit case to the support member are covered by the display main body, meaning that the screws cannot be accessed from the display screen side.

[0006] Therefore, when it is necessary to remove the display unit from the support member for maintenance, inspection, etc., it is necessary to remove the display unit from the support member by loosening the screws from the rear side of the support member, and then receive the detached display unit on the display screen side of the display device. Note that the "rear side of the support member" refers to the surface of the support member opposite the surface facing the unit case.

[0007] In addition, when attaching the display unit to the support member, it was necessary to position the display unit on the display screen side of the display device and then tighten the screws from the rear side of the support member. As described above, in the past, it was time-consuming to remove the display unit from the support member and to attach the display unit to the support member.

[0008] An object of the present disclosure is to provide a display unit that can be easily removed from and attached to a support member, and a display device including the display unit. [Means for solving the problem]

[0009] The display unit according to the present disclosure comprises: A display unit fixed to a support member, a display main body that displays images and has a plurality of light-emitting elements each emitting visible light and a circuit board on which the plurality of light-emitting elements are arranged; a unit case fixed to the support member while holding the display main body; Equipped with The unit case is a case bottom plate portion interposed between the display main body portion and the support member and facing the display main body portion and the support member, the case bottom plate portion having a fixing hole through which a fixing tool for fixing the case bottom plate portion to the support member is inserted; having The display main body includes: an access hole for allowing a tool to reach the fixing hole or the fixing tool inserted in the fixing hole from the outside; is formed. Effect of the Invention

[0010] According to the above configuration, since the access hole is formed in the display main body, the display unit can be easily removed from the support member and attached to the support member. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a front view of a display screen of a display device according to a first embodiment; [Diagram 2] 1 is a cross-sectional view of a display unit according to a first embodiment, taken along the line of a light-emitting element and a seal member. [Diagram 3] 1 is a cross-sectional view of a light-emitting device according to a first embodiment. [Figure 4] 1 is a cross-sectional view of a display unit according to a first embodiment taken along the line corresponding to an access hole; [Diagram 5] A conceptual diagram for explaining the problem to be solved in the second embodiment. [Figure 6] 11 is a cross-sectional view of a display unit according to a second embodiment taken along the line of an access hole; [Figure 7] 3 is a cross-sectional view of a blocking elastic body according to embodiment 2. [Figure 8] 3 is a cross-sectional view of a blocking elastic body according to a third embodiment. [Figure 9] 11 is a cross-sectional view of a blocking elastic body according to a fourth embodiment. [Figure 10] 13 is a cross-sectional view of a display unit according to a fifth embodiment taken along the line corresponding to an access hole; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Display devices according to embodiments will be described below with reference to the drawings, in which the same or corresponding parts are denoted by the same reference numerals.

[0013] [Embodiment 1] As shown in FIG. 1, a display device 900 according to this embodiment includes a plurality of display units 800 each for displaying an image, and a support housing 910 supporting the plurality of display units 800.

[0014] The multiple display units 800 are fixed to a support housing 910 in a state where they are arranged vertically and horizontally in a matrix. As a result, the multiple display units 800 as a whole constitute one display screen 920. In other words, each display unit 800 constitutes a part of the display screen 920.

[0015] To facilitate the following explanation, a right-handed XYZ Cartesian coordinate system is defined for display device 900, in which the left-right direction when viewing display screen 920 from the front is the X-axis direction, the up-down direction is the Y-axis direction, and the direction perpendicular to the X-axis and Y-axis directions is the Z-axis direction. The direction from left to right is the positive direction of the X-axis. Note that FIG. 1 is a front view of display screen 920 as viewed from a line of sight parallel to the Z-axis.

[0016] In this embodiment, the X-axis is parallel to the rows of the matrix formed by the multiple display units 800. The Y-axis is parallel to the columns of the matrix. The Y-axis typically extends vertically in a site where the display device 900 is installed.

[0017] Below, we will explain the configuration of each display unit 800. In Fig. 2, which will be referred to below, the above-mentioned XYZ orthogonal coordinate system is added to the display unit 800 when the display unit 800 constitutes the display device 900. The same applies to Figs. 3 to 10.

[0018] As shown in FIG. 2, the display unit 800 includes a display main body 500 that displays images, and a unit case 600 that holds the display main body 500.

[0019] The unit case 600 has a case bottom plate portion 610 having a plate-like portion extending in an in-plane direction perpendicular to the Z axis, and a rear side wall portion 620 rising in the positive direction of the Z axis from an edge portion in the in-plane direction of the case bottom plate portion 610. The unit case 600 is formed by injection molding in which a resin such as an acrylic resin or polycarbonate is injected into a mold.

[0020] 1, to which the display unit 800 is fixed, has a back plate portion 911 facing the case bottom plate portion 610. Like the case bottom plate portion 610, the back plate portion 911 also has a plate shape extending in an in-plane direction perpendicular to the Z axis. The case bottom plate portion 610 is in contact with the back plate portion 911.

[0021] The back plate portion 911 is an example of a support member according to the present disclosure to which the display unit 800 is fixed. The display unit 800 is fixed to the support housing 910 by fixing the case bottom plate portion 610 to the back plate portion 911.

[0022] The display main body 500 has a plurality of light-emitting elements 100 each emitting visible light, and a circuit board 200 on which the plurality of light-emitting elements 100 are arranged on a surface 211. Each light-emitting element 100 constitutes a pixel on the display screen 920 of FIG.

[0023] 3, each light emitting element 100 has a red LED (Light Emitting Diode) 110R that emits red light, a green LED 110G that emits green light, and a blue LED 110B that emits blue light. Each of the red LED 110R, the green LED 110G, and the blue LED 110B is a radiation source of visible light.

[0024] The light emitting element 100 also has a package member 120 that holds the red LED 110R, the green LED 110G, and the blue LED 110B. The package member 120 has a bottomed recess that has a depth in the thickness direction of the circuit board 200 shown in Fig. 2, i.e., in the Z-axis direction. The red LED 110R, the green LED 110G, and the blue LED 110B are arranged on the bottom surface of the recess.

[0025] The recess is filled with a transparent sealing member 140. The transparent sealing member 140 covers the red LED 110R, the green LED 110G, and the blue LED 110B. The transparent sealing member 140 is made of a resin that transmits visible light.

[0026] The light emitting element 100 also has a lead frame 130 exposed at a portion of the package member 120 facing the circuit board 200 shown in Fig. 2. The lead frame 130 is electrically and mechanically connected to the circuit board 200 shown in Fig. 2, and supplies power required for light emission to each of the red LED 110R, the green LED 110G, and the blue LED 110B.

[0027] Returning to the explanation of Fig. 2, the circuit board 200 holding a plurality of the light-emitting elements 100 described above has a front surface 211 on which the light-emitting elements 100 are attached, a back surface 212 opposite to the front surface 211 in the Z-axis direction, and a side surface 213 connecting the front surface 211 and the back surface 212.

[0028] The multiple light-emitting elements 100 are arranged in a matrix on the surface 211 of the circuit board 200. The row direction of the matrix is ​​parallel to the X-axis direction, and the column direction is parallel to the Y-axis direction. As an example, 49 light-emitting elements 100 are arranged in a matrix of 7 rows and 7 columns on the surface 211 of the circuit board 200.

[0029] An electrode pad (not shown) is formed on the front surface 211 of the circuit board 200 for each light emitting element 100. The lead frame 130 of the light emitting element 100 shown in FIG. 3 is electrically and mechanically connected to the electrode pad.

[0030] On the other hand, a control circuit 220 is provided on the back surface 212 of the circuit board 200. The control circuit 220 is electrically connected to the electrode pads on the front surface 211 through via holes (not shown) formed in the circuit board 200.

[0031] In this manner, the control circuit 220 electrically connected to the light emitting element 100 controls the intensity ratio between the three primary color light components emitted by the red LED 110R, the green LED 110G, and the blue LED 110B shown in Fig. 3. This realizes the display of an image on the display screen 920 shown in Fig. 1.

[0032] The rear surface 212 of the circuit board 200 faces the case bottom plate portion 610 of the unit case 600 in the Z-axis direction. A gap GP is provided between the rear surface 212 of the circuit board 200 and the case bottom plate portion 610.

[0033] Hereinafter, with respect to the Z-axis direction parallel to the direction in which case bottom plate portion 610 and circuit board 200 face each other, the direction from case bottom plate portion 610 toward circuit board 200, i.e., the positive Z-axis direction, will also be referred to as the "forward" direction. Also, with respect to the Z-axis direction, the direction from circuit board 200 toward case bottom plate portion 610, i.e., the negative Z-axis direction, will also be referred to as the "rear" direction.

[0034] The display main body 500 also has a lens case 300 having a portion disposed forward of the circuit board 200. The lens case 300 is transparent to visible light. The lens case 300 is integrally injection molded using a mold from a resin having a higher refractive index than air. Examples of the resin include acrylic resin and polycarbonate.

[0035] The lens case 300 has lens units 320 arranged at positions facing each of the multiple light-emitting elements 100. Since the multiple light-emitting elements 100 are distributed in a matrix pattern in the XY virtual plane, the multiple lens units 320 are also distributed in a matrix pattern in the XY plane. Each lens unit 320 plays a role in adjusting the directivity of visible light emitted by the light-emitting element 100 facing it.

[0036] Furthermore, the lens case 300 has a plate-shaped main body 310 disposed at a position facing the surface 211 of the circuit board 200. The plate-shaped main body 310 serves to hold a plurality of lens units 320. The plate-shaped main body 310 extends in an in-plane direction perpendicular to the Z axis, and faces the surface 211 of the circuit board 200 in the Z axis direction. A gap is secured between the plate-shaped main body 310 and the surface 211 of the circuit board 200.

[0037] The plate-shaped main body 310 is an example of a front plate member according to the present disclosure, which is disposed forward of the circuit board 200.

[0038] The lens case 300 also has a front sidewall 330 that extends rearward from an edge of the plate-shaped main body 310 in an in-plane direction perpendicular to the Z axis. The front sidewall 330 faces the side surface 213 of the circuit board 200.

[0039] A tip surface 331 located at the rear end of the front side wall portion 330 faces a tip surface 621 located at the front end of the rear side wall portion 620 of the unit case 600. A seal member 810 is interposed between the tip surface 331 of the front side wall portion 330 and the tip surface 621 of the rear side wall portion 620.

[0040] The seal member 810 is a waterproof packing. Examples of the material of the seal member 810 include rubbers or resins such as nitrile rubber, fluororubber, urethane, and silicone.

[0041] The seal member 810 is in close contact with the tip surface 331 of the front side wall portion 330 and the tip surface 621 of the rear side wall portion 620 in a state where the seal member 810 is pressed by these tip surfaces 331 and 621. In this way, the seal member 810 plays a role in preventing rainwater and other moisture from entering the gap GP from the outside of the unit case 600 and the lens case 300.

[0042] The circuit board 200 is formed in a quadrangle when viewed from a line of sight parallel to the Z axis, and has four side surfaces 213. Each of the four side surfaces 213 faces a front side wall portion 330, and a tip surface 621 of a rear side wall portion 620 faces a tip surface 331 of each front side wall portion 330. In other words, in correspondence with the circuit board 200 having four side surfaces 213, the lens case 300 also has four front side walls 330, and the unit case 600 also has four rear side walls 620.

[0043] The display main body 500 also has a mask plate 400 disposed in front of the lens case 300. The mask plate 400 is made of black resin. The mask plate 400 has a mask main body 410 extending in an in-plane direction perpendicular to the Z axis. The mask main body 410 faces the plate-shaped main body 310 of the lens case 300 in the Z axis direction.

[0044] The mask body 410 plays a role in blocking sunlight, light from illumination, and the like (hereinafter collectively referred to as external light) that is about to enter the lens case 300 from the outside toward the circuit board 200. The reflectance of the mask body 410 to external light is smaller than the reflectance of the lens case 300 to external light. Therefore, the mask body 410 prevents the reflected light of external light reflected by the display screen 920 shown in FIG. 1 from reaching the eyes of an observer looking at the display screen 920. This improves the contrast of the image displayed on the display screen 920.

[0045] In the mask body 410, an opening 420 through which visible light whose directivity has been adjusted by each lens portion 320 passes is formed for each light-emitting element 100. In other words, the visible light emitted from the light-emitting element 100 and whose directivity has been adjusted by the lens portion 320 passes through the opening 420 and reaches the viewer's eye.

[0046] The mask plate 400 also has a visor portion 430 provided on the mask body portion 410. The visor portion 430 protrudes forward from the surface of the mask body portion 410 facing the outside. The reflectance of the visor portion 430 to external light is smaller than the reflectance of the lens case 300 to external light.

[0047] Eaves 430 have a height in the Z-axis direction and extend in the X-axis direction. A plurality of eave sections 430 are arranged in the Y-axis direction. Openings 420 and eave sections 430 are alternately arranged in the Y-axis direction. Eaves 430 suppress the incidence of external light into openings 420, thereby contributing to improving contrast.

[0048] Next, a configuration for fixing the above-described display unit 800 to the supporting housing 910 will be described with reference to FIG.

[0049] 4, the display unit 800 is fixed to the support housing 910 by fixing the case bottom plate 610 of the unit case 600 holding the display main body 500 to the back plate 911. A screw SC is used to fix the case bottom plate 610 to the back plate 911. The screw SC is an example of a fastener according to the present disclosure.

[0050] Fixing holes 610a through which screws SC are inserted in the Z-axis direction are formed in the case bottom plate portion 610. Similarly, fixing holes 911a through which screws SC are inserted in the Z-axis direction are formed in the back plate portion 911. The fixing holes 610a in the case bottom plate portion 610 and the fixing holes 911a in the back plate portion 911 are continuous in the Z-axis direction.

[0051] In this embodiment, the head of the screw SC is disposed forward of the shaft of the screw SC, that is, at a position in contact with the case bottom plate portion 610. That is, the screw SC is inserted rearward into the fixing holes 610a and 911a. For this reason, of the fixing holes 610a and 911a, at least the inner surface of the fixing hole 911a has a thread and a thread groove that mesh with the screw SC.

[0052] The most distinctive feature of the display unit 800 according to this embodiment is that an access hole 510 is formed in the display main body 500. The access hole 510 communicates with the fixing hole 610a or the head of the screw SC inserted into the fixing hole 610a.

[0053] Since the access hole 510 is formed, a tool TL can reach the fixing hole 610a or the screw SC from the front of the display unit 800 through the access hole 510. Here, the tool TL is used to tighten and loosen the screw SC, and specifically refers to a screwdriver, a bit, a wrench, or the like.

[0054] In the conventional configuration, since there is no access hole 510, the screw SC is covered by the display main body 500. In other words, the screw SC cannot be accessed from the side of the display screen 920 shown in FIG.

[0055] For this reason, the head of the screw SC must be disposed behind the back plate 911, and when it is desired to remove the display unit 800 from the back plate 911 for maintenance, inspection, or the like, the screw SC must be loosened from the rear side of the back plate 911. In this case, the display unit 800 removed from the back plate 911 must be received on the display screen 920 side.

[0056] Furthermore, when attaching the display unit 800 to the back plate 911, it was necessary to position the display unit 800 on the display screen 920 side and then tighten the screws SC from the rear side of the back plate 911.

[0057] In contrast, in this embodiment, the access hole 510 is formed in the display main body 500, so that the display unit 800 can be easily removed from the back plate 911 and attached to the back plate 911.

[0058] Specifically, when maintenance of the display unit 800 is required, the screws SC can be loosened from the side of the display screen 920, and the display unit 800 removed from the back plate portion 911 can be received on the same side of the display screen 920. This facilitates the maintenance work.

[0059] Furthermore, when assembling the display device 900, the screws SC can be tightened from the side of the display screen 920 with the display unit 800 positioned on the side of the display screen 920. This facilitates the assembly of the display device 900. Note that, although Fig. 4 shows only one representative set of the screws SC, fixing holes 610a, fixing holes 911a, and access holes 510, multiple sets of these sets are distributed in the in-plane direction perpendicular to the Z axis.

[0060] The configuration of the access hole 510 will now be described in detail.

[0061] First, a through hole 411 is formed in the mask body 410 of the mask plate 400 located at the frontmost position. The through hole 411 constitutes a part of the access hole 510 in the Z-axis direction, and is formed separately from the opening 420 shown in FIG.

[0062] A through hole 311 is also formed in the plate-shaped main body 310 of the lens case 300 located behind the mask plate 400. Like the through hole 411, the through hole 311 also constitutes another part of the access hole 510 in the Z-axis direction.

[0063] Furthermore, the lens case 300 has a front cylindrical portion 340 that extends rearward from the position of the through hole 311 of the plate-shaped main body 310 toward the case bottom plate portion 610. The internal cavity of the front cylindrical portion 340 is continuous with the through hole 311.

[0064] The front cylindrical portion 340 constitutes the inner surface of the remaining portion in the Z-axis direction of the access hole 510. In other words, the positions of the internal cavity of the front cylindrical portion 340 and the through-hole 311 in the XY virtual plane coincide with the position of the through-hole 411 of the mask body 410 in the XY virtual plane.

[0065] The front cylindrical portion 340 penetrates the circuit board 200 in the Z-axis direction. That is, a through hole 230 for inserting the front cylindrical portion 340 is formed in the circuit board 200. A rear end portion 341 of the front cylindrical portion 340 is disposed in a position facing the screw SC and the fixing hole 610a in the gap GP between the circuit board 200 and the case bottom plate portion 610.

[0066] As described above, the through hole 411 of the mask plate 400, the through hole 311 of the plate-shaped main body portion 310, and the front cylindrical portion 340 form an access hole 510 that communicates with the screw SC and the fixing hole 610a.

[0067] The front cylindrical portion 340 serves to guide the tool TL to the gap GP when the tool TL is inserted into the access hole 510. Since the front cylindrical portion 340 extends from the plate-like main body portion 310 disposed forward of the circuit board 200 and penetrates the circuit board 200, the tool TL does not hit the board 200 when the tool TL is inserted into the access hole 510. In other words, the front cylindrical portion 340 also serves to protect the circuit board 200 from the tool TL.

[0068] Note that the display unit 800 may be installed outdoors. In particular, in such cases, there is a concern that rainwater, melting snow, and other moisture (hereinafter simply referred to as moisture) may seep into the access hole 510 and reach the circuit board 200. If moisture reaches the circuit board 200, it may cause the circuit board 200 to break down.

[0069] Therefore, the display unit 800 according to this embodiment has a waterproof structure that prevents moisture from reaching the circuit board 200 even if the moisture penetrates through the access hole 510. The waterproof structure will be described below.

[0070] The case bottom plate portion 610 of the unit case 600 has a plate-shaped bottom plate main body portion 611 facing the circuit board, and a rear cylindrical portion 612 extending forward from the bottom plate main body portion 611. A fixing hole 610a is formed in the bottom plate main body portion 611. The rear cylindrical portion 612 surrounds the front opening of the fixing hole 610a or the head of the screw SC over the entire circumference when viewed from a line of sight parallel to the Z axis.

[0071] The gap between the rear cylindrical portion 612 and the front cylindrical portion 340 is watertightly blocked by the blocking elastic body 700. This prevents moisture from reaching the circuit board 200 even if moisture enters the access hole 510 from the outside.

[0072] That is, the blocking elastic body 700 has a rear cylindrical portion contact surface 711 that contacts the rear cylindrical portion 612, and a front cylindrical portion contact surface 721 that contacts the front cylindrical portion 340. The blocking elastic body 700 is formed of rubber or resin such as nitrile rubber, fluororubber, urethane, silicone, etc.

[0073] Moreover, the blocking elastic body 700 is arranged in a state where it is pressurized in the Z-axis direction. This point will be described below.

[0074] In this embodiment, a projection area of ​​the front cylindrical portion 340 projected in the Z-axis direction onto the bottom plate main body portion 611 is disposed inside the rear cylindrical portion 612. The rear cylindrical portion 612 extends forward toward the rear surface 212 of the circuit board 200.

[0075] The blocking elastic body 700 is interposed between the rear cylindrical portion 612 and the rear surface 212 of the circuit board 200. That is, the blocking elastic body 700 also has a circuit board contact surface 712 that comes into close contact with the rear surface 212 of the circuit board 200.

[0076] The rear cylindrical portion contact surface 711 of the blocking elastic body 700 is in contact with the front end of the rear cylindrical portion 612. The blocking elastic body 700 extends in an annular shape along the front end of the rear cylindrical portion 612.

[0077] The blocking elastic body 700 is arranged in a state where it is pressed in the Z-axis direction by the circuit board 200 and the front end of the rear cylindrical portion 612. The front end of the rear cylindrical portion 612 is bitten into the blocking elastic body 700.

[0078] The front tubular portion contact surface 721 of the blocking elastic body 700 is in contact with the outer surface of the portion of the front tubular portion 340 that protrudes into the gap GP (hereinafter, referred to as the protruding portion 342) over the entire circumference. In other words, the blocking elastic body 700 elastically tightens the protruding portion 342 of the front tubular portion 340.

[0079] In this manner, the blocking elastomer 700 watertightly blocks the area between the front tubular portion 340 and the case bottom plate portion 610, specifically, the area between the outer surface of the protruding portion 342 of the front tubular portion 340 and the front end portion of the rear tubular portion 612 at the case bottom plate portion 610, all around.

[0080] Therefore, even though the access hole 510 is formed to allow the tool TL to access the fixing hole 610a or the head of the screw SC, the circuit board 200 can be kept waterproof. In other words, even if moisture infiltrates through the access hole 510, the circuit board 200 can be protected from the moisture.

[0081] As described above, the blocking elastic body 700 is arranged in a state where it is pressed in the Z-axis direction by the circuit board 200 and the front end of the rear cylindrical portion 612. Therefore, the position of the blocking elastic body 700 is unlikely to shift, and the state where the rear cylindrical portion contact surface 711 of the blocking elastic body 700 and the front end of the rear cylindrical portion 612 are in close contact with each other can be stably maintained. This makes it possible to more reliably waterproof the circuit board 200.

[0082] In addition, the blocking elastic body 700 elastically fastens the entire circumference of the protruding portion 342 of the front tubular portion 340. This makes it possible to stably maintain the state in which the front tubular portion contact surface 721 of the blocking elastic body 700 and the outer surface of the protruding portion 342 are in close contact with each other. This also contributes to making the circuit board 200 more reliable in waterproofing.

[0083] In addition, the front cylindrical portion 340 penetrates the circuit board 200. Therefore, the front cylindrical portion 340, which constitutes the access hole 510 and guides the tool TL, also serves to waterproof the gap between the surface 211 of the circuit board 200 and the plate-like main body portion 310 of the lens case 300.

[0084] Therefore, to prevent moisture from reaching circuit board 200, it is sufficient to waterproof only the area between the rear end of front cylindrical portion 340 and case bottom plate portion 610. In other words, the configuration in which front cylindrical portion 340 penetrates circuit board 200 contributes to simplifying the structure required for waterproofing circuit board 200.

[0085] [Embodiment 2] First, the problem to be solved in this embodiment will be described with reference to FIG.

[0086] The thermal expansion coefficient of lens case 300 is larger than that of circuit board 200. For this reason, when lens case 300 and circuit board 200 thermally expand, front cylindrical portion 340 of lens case 300 may be displaced relative to through hole 230 of circuit board 200 in an in-plane direction perpendicular to the Z axis.

[0087] On the other hand, the blocking elastic body 700 is in close contact with the circuit board 200 in the Z-axis direction at the circuit board contact surface 712. Therefore, the blocking elastic body 700 is unlikely to be displaced relative to the circuit board 200 in an in-plane direction perpendicular to the Z-axis.

[0088] As a result, there is a concern that a separation portion CL will occur between the front cylindrical portion contact surface 721 of the blocking elastic body 700 and the front cylindrical portion 340 of the lens case 300, where the front cylindrical portion contact surface 721 is separated from the front cylindrical portion 340.

[0089] When the separation portion CL is formed, moisture that has entered the area surrounded by the rear cylindrical portion 612 from the outside through the access hole 510 can reach the circuit board 200 through the separation portion CL. As described above, moisture reaching the circuit board 200 can cause the circuit board 200 to fail.

[0090] The separation portion CL can be formed only in a part of the circumferential direction around the front cylindrical portion 340. Fig. 5 shows a cross section of the separation portion CL at a position where the dimension in the radial direction perpendicular to the circumferential direction is the largest.

[0091] In addition, while the separation portion CL is generated as described above, the blocking elastic body 700 may be excessively compressed radially outward by the front tubular portion 340 at a position opposite the separation portion CL in the radial direction. In a state in which the blocking elastic body 700 is excessively compressed, the blocking elastic body 700 is difficult to elastically deform, and there is a concern that the waterproof function of the blocking elastic body 700 may be reduced. A configuration for solving the above-described problems will be described below.

[0092] As shown in FIG. 6, in order to solve the above problem, the blocking elastomer 700 of this embodiment has a configuration in which an outer tube portion 710 in close contact with the circuit board 200 and an inner tube portion 720 in close contact with the outer surface of the front tube portion 340 are connected by a connecting portion 730.

[0093] The configuration of the blocking elastic body 700 will be specifically described with reference to Fig. 7. To facilitate the following description, an imaginary central axis VL is defined that is parallel to the Z axis and passes through the center of the cavity inside the front cylindrical part 340 in a plane perpendicular to the Z axis. The front cylindrical part 340 is formed in a cylindrical shape that surrounds the imaginary central axis VL.

[0094] The outer cylinder portion 710 constitutes the above-mentioned circuit board contact surface 712 and rear cylinder portion contact surface 711. That is, the outer cylinder portion 710 is pressed in the Z-axis direction by the circuit board 200 and the front end portion of the rear cylinder portion 612. The outer cylinder portion 710 is formed in a cylindrical shape surrounding the imaginary central axis line VL.

[0095] The inner cylinder portion 720 is also formed in a cylindrical shape surrounding the imaginary central axis VL, similar to the outer cylinder portion 710. However, the inner cylinder portion 720 is disposed inward, closer to the imaginary central axis VL than the outer cylinder portion 710, in the radial direction perpendicular to the imaginary central axis VL.

[0096] The inner cylindrical portion 720 constitutes the aforementioned front cylindrical portion contact surface 721 that comes into contact with the outer surface of the front cylindrical portion 340. The inner cylindrical portion 720 elastically tightens the front cylindrical portion 340 in the radial direction. In other words, the inner diameter of the inner cylindrical portion 720 in its natural state is smaller than the outer diameter of the front cylindrical portion 340.

[0097] Here, the "natural state" refers to a state in which the front cylindrical portion 340 is not inserted into the inner cylindrical portion 720 and the inner cylindrical portion 720 is not expanded in the radial direction. Note that Fig. 7 shows the blocking elastic body 700 in its natural state.

[0098] Moreover, the inner cylindrical portion 720 has an inward protruding portion 722 that protrudes inward in the radial direction from the front cylindrical portion contact surface 721. The inward protruding portion 722 extends over the entire circumference in the circumferential direction around the imaginary central axis VL. By providing the inward protruding portion 722 on the front cylindrical portion contact surface 721, the contact of the inner cylindrical portion 720 with the front cylindrical portion 340 can be made more reliable and stronger.

[0099] The connecting portion 730 connects an inner peripheral surface 713 of the outer cylinder portion 710 facing the inner cylinder portion 720 and an outer peripheral surface 723 of the inner cylinder portion 720 facing the outer cylinder portion 710. The inner peripheral surface 713 and the outer peripheral surface 723 face each other in a radial direction perpendicular to the imaginary central axis VL through a gap 700a. The above-mentioned radial dimension of the connecting portion 730 is equal to the above-mentioned radial dimension of the gap 700a. In addition, the thickness, which is the dimension of the connecting portion 730 in the Z-axis direction, is smaller than the height of the outer cylinder portion 710 in the Z-axis direction and the height of the inner cylinder portion 720 in the Z-axis direction.

[0100] The connecting portion 730 serves to allow displacement of the inner cylinder portion 720 relative to the outer cylinder portion 710 in an in-plane direction perpendicular to the Z axis.

[0101] Therefore, even if the front tube portion 340 is displaced in the in-plane direction relative to the through hole 230 of the circuit board 200 due to thermal expansion of the lens case 300, the inner tube portion 720 will follow the front tube portion 340 and displace in the in-plane direction relative to the outer tube portion 710 while remaining in close contact with the outer peripheral surface of the front tube portion 340 all around.

[0102] Specifically, at a location where the front tubular portion 340 is about to move away from the outer tubular portion 710, the inner tubular portion 720 is displaced relative to the outer tubular portion 710 in such a manner that the gap 700a between the inner circumferential surface 713 and the outer circumferential surface 723 widens in the radial direction. For this reason, the separation portion CL shown in FIG. 5 is unlikely to be formed.

[0103] Furthermore, since the gap 700a is secured between the inner circumferential surface 713 and the outer circumferential surface 723, at a location where the front tubular portion 340 approaches the outer tubular portion 710, the inner tubular portion 720 is allowed to displace relative to the outer tubular portion 710 in a manner that the gap 700a between the inner circumferential surface 713 and the outer circumferential surface 723 narrows in the radial direction. In other words, the radially outward force that the inner tubular portion 720 receives from the front tubular portion 340 is absorbed by the outer circumferential surface 723 displacing in a direction approaching the inner circumferential surface 713.

[0104] 5, the portion of the blocking elastic body 700 that constitutes the circuit board contact surface 712 and the rear cylindrical portion contact surface 711, specifically the outer cylindrical portion 710, is less likely to be excessively compressed radially outward by the front cylindrical portion 340. In this manner, the problem described with reference to FIG.

[0105] The connection portion 730 extends from a front end portion 714, which is the end portion of the outer cylinder portion 710 closer to the circuit board 200 in the Z-axis direction, toward the inner cylinder portion 720.

[0106] However, at the boundary between the circuit board contact surface 712 and the connection portion 730, a step is formed that descends rearward from the circuit board contact surface 712 toward the connection portion 730, and a gap 700b is secured between the connection portion 730 and the rear surface 212 of the circuit board 200, as well as between the inner cylinder portion 720 and the rear surface 212 of the circuit board 200. Therefore, the connection portion 730 and the inner cylinder portion 720 do not contact the rear surface 212 of the circuit board 200.

[0107] If the connection portion 730 and the inner tube portion 720 are in contact with the rear surface 212 of the circuit board 200, there is a concern that the relative in-plane displacement of the inner tube portion 720 relative to the outer tube portion 710 will be hindered by friction between the connection portion 730 and the inner tube portion 720 and the rear surface 212 of the circuit board 200.

[0108] In contrast, in this embodiment, the gap 700b is secured between the connecting portion 730 and the inner cylinder portion 720 and the rear surface 212 of the circuit board 200, so that the relative in-plane displacement movement of the inner cylinder portion 720 with respect to the outer cylinder portion 710 is not easily impeded. This can further reduce the possibility of the separation portion CL shown in FIG. 5 being formed.

[0109] [Embodiment 3] As mentioned above, when the internal structure of the occluding elastic body 700 is excessively distorted due to compression, the occluding elastic body 700 is difficult to elastically deform, and there is a concern that the waterproof function of the occluding elastic body 700 may be reduced.

[0110] As shown in Fig. 7, in the above-mentioned second embodiment, the gap 700a is formed in the blocking elastic body 700, thereby suppressing the internal structure of the outer tubular portion 710 from being excessively distorted in the above-mentioned radial direction. A configuration may be adopted to further reduce the possibility that the outer tubular portion 710 becomes difficult to elastically deform. A specific example thereof will be described below.

[0111] 8, a groove 700c is formed in the circuit board contact surface 712 of the outer cylindrical portion 710 according to this embodiment, the groove 700c being recessed rearward from the circuit board contact surface 712. The groove 700c extends over the entire circumference in the circumferential direction around the imaginary center axis VL of the front cylindrical portion 340, similar to the outer cylindrical portion 710, the inner cylindrical portion 720, and the connecting portion 730.

[0112] Let us assume that as a result of the front tubular portion 340 being displaced relative to the outer tubular portion 710 in the in-plane direction, a force that attempts to compress the outer tubular portion 710 in the radial direction (hereinafter referred to as radial outward force) acts on the outer tubular portion 710.

[0113] Even in this case, according to this embodiment, the outer shape of the outer tubular portion 710 is deformed in such a manner that the radial width of the groove 700c is narrowed, and the above-mentioned radial outward force is absorbed. Therefore, excessive radial compressive stress is unlikely to act on the internal structure of the outer tubular portion 710. Therefore, it is possible to further reduce the possibility that the outer tubular portion 710 will not easily deform elastically. The other configurations and effects are the same as those of the second embodiment.

[0114] [Embodiment 4] A modification of the blocking elastic body 700 shown in FIG. 7 will be described below as a fourth embodiment.

[0115] As shown in FIG. 9, the connection portion 730 may extend toward the inner tube portion 720 from an intermediate portion 715 between the end of the outer tube portion 710 closer to the circuit board 200 and the end closer to the case bottom plate portion 610 in the Z-axis direction.

[0116] In this embodiment, the connecting portion 730 extends from the intermediate portion 715, so that a pair of gaps 700a between the inner surface 713 of the outer tube portion 710 and the outer surface 723 of the inner tube portion 720 are formed in the Z-axis direction via the connecting portion 730.

[0117] 7 in that the connecting portion 730 and the inner cylinder portion 720 are not in contact with the rear surface 212 of the circuit board 200. In this embodiment, the inner cylinder portion 720 has a pair of inward protrusions 722 that protrude radially inward from the front cylinder portion contact surface 721. The pair of inward protrusions 722, each extending in the circumferential direction, are aligned in the Z-axis direction. In this embodiment, the same effects as those in the second embodiment can be obtained. The other configurations are the same as those in the second embodiment.

[0118] [Embodiment 5] 4 to 6 show an example of a configuration in which the case bottom plate portion 610 includes the rear cylindrical portion 612, but a waterproof structure can be formed without using the rear cylindrical portion 612. Below, a waterproof structure in which the rear cylindrical portion 612 is omitted will be described.

[0119] 10, in the present embodiment, similarly to the configuration shown in Figures 4 to 6, the blocking elastic body 700 watertightly blocks the gap between the front tubular portion 340 and the case bottom plate portion 610. However, in the present embodiment, unlike the configuration shown in Figures 4 to 6, the blocking elastic body 700 is interposed between the rear end of the front tubular portion 340 and the bottom plate main body portion 611 of the case bottom plate portion 610.

[0120] That is, the blocking elastic body 700 according to this embodiment has a front cylindrical part contact surface 741 that contacts the rear end of the front cylindrical part 340, and a bottom plate main body part contact surface 742 that contacts the bottom plate main body part 611. When viewed from a line of sight parallel to the Z axis, the blocking elastic body 700 is formed in an annular shape that surrounds the front opening of the fixing hole 610a or the head of the screw SC over the entire circumference. The blocking elastic body 700 is arranged in a state where it is pressurized in the Z axis direction by the rear end of the front cylindrical part 340 and the bottom plate main body part 611 of the case bottom plate part 610.

[0121] According to this embodiment, the rear cylindrical portion 612 shown in Figures 4 to 6 can be omitted, so the configuration of the unit case 600 can be simplified compared to the configuration shown in Figures 4 to 6. The other configurations and effects are the same as those of the configuration shown in Figures 4 to 6.

[0122] The above describes the first to fifth embodiments. The following modifications are also possible.

[0123] The configurations of two or more embodiments selected from the embodiments 1 to 5 may be combined with each other. As an example, the groove 700c shown in Fig. 8 may be formed on the circuit board contact surface 712 of the blocking elastic body 700 shown in Figs. 4 and 5, or may be formed on the circuit board contact surface 712 of the blocking elastic body 700 shown in Fig. 9.

[0124] The display unit 800 according to the embodiments 1-5 includes a moisture-preventing structure for protecting the circuit board 200 from moisture, and is therefore particularly suitable for use outdoors where it may be exposed to rain and snow. As an example, the display device 900 according to the embodiments 1-5 can be placed near a road and used as a road sign device for displaying information on traffic, weather, and the like. The display device 900 according to the embodiments 1-5 may also be installed on the surface of a building, in a stadium, and the like.

[0125] However, the display device 900 may be installed indoors. When the display device 900 is installed in a location that is not exposed to rain and snow, and the waterproof structure is not required, the blocking elastic body 700 may be omitted.

[0126] Furthermore, regardless of the installation location of the display device 900, the blocking elastic body 700 may also be omitted when the circuit board 200 itself has a waterproof structure. Specifically, when the circuit board 200 itself has a waterproof structure, this refers to a configuration in which the front surface 211, the light emitting element 100, the back surface 212, the control circuit 220, and the side surface 213 of the circuit board 200 are covered with a waterproof coating.

[0127] Even when the blocking elastic body 700 is omitted, it is preferable that the front cylindrical portion 340 extends through the circuit board 200. This is because the front cylindrical portion 340 not only serves to simplify the waterproof structure, but also serves to guide the tool TL to the head of the screw SC or the fixing hole 610a and to protect the circuit board 200 from the tool TL.

[0128] 3 illustrates a light-emitting element 100 having three types of LEDs. The light-emitting element 100 may have only one type of LED, or may use, as a radiation source of visible light constituting the light-emitting element 100, an LD (Laser Diode), an organic EL (Electro-Luminescence), or the like, in addition to an LED.

[0129] Various aspects of the present disclosure are described below.

[0130] (Appendix 1) A display unit fixed to a support member, a display main body that displays images and has a plurality of light-emitting elements each emitting visible light and a circuit board on which the plurality of light-emitting elements are arranged; a unit case fixed to the support member while holding the display main body; Equipped with The unit case is a case bottom plate portion interposed between the display main body portion and the support member and facing the display main body portion and the support member, the case bottom plate portion having a fixing hole through which a fixing tool for fixing the case bottom plate portion to the support member is inserted; having The display main body includes: an access hole for allowing a tool to reach the fixing hole or the fixing tool inserted in the fixing hole from the outside; A display unit is formed. (Appendix 2) With respect to the Z-axis direction, which is parallel to the direction in which the case bottom plate portion and the display main body portion face each other, when the direction from the case bottom plate portion toward the display main body portion is defined as the front, and the direction from the display main body portion toward the case bottom plate portion is defined as the rear, The display main body portion includes: a front plate-shaped member disposed forward of the circuit board and having a through hole that constitutes a part of the access hole in the Z-axis direction; a front cylindrical portion that constitutes an inner surface of the access hole, the front cylindrical portion extending rearward from a position of the through hole of the front plate member toward the case bottom plate portion and penetrating the circuit board; 2. The display unit of claim 1, (Appendix 3) a blocking elastic body that watertightly blocks the gap between the front cylindrical portion and the case bottom plate portion; 3. The display unit of claim 2, further comprising: (Appendix 4) A gap is provided between the circuit board and the case bottom plate, the rear end of the front tubular portion is disposed in the gap, The case bottom plate portion is a bottom plate body portion facing the circuit board and having the fixing hole formed therein; a rear tubular portion extending forward from the bottom plate body portion and surrounding the fixing hole; having The blocking elastic body is a rear cylindrical portion contact surface that contacts the rear cylindrical portion and a front cylindrical portion contact surface that contacts the front cylindrical portion, and a gap between the rear cylindrical portion and the front cylindrical portion is watertightly closed. 2. A display unit as described in Appendix 3. (Appendix 5) a projection area of ​​the front tubular portion projected onto the bottom plate main body in the Z-axis direction is disposed inside the rear tubular portion, The blocking elastic body is The circuit board further has a circuit board contact surface that is in contact with the back surface of the circuit board facing the bottom plate main body portion, and is arranged in a state where the circuit board is pressed in the Z-axis direction by the front end portion of the rear cylindrical portion. 6. A display unit as described in appended claim 4. (Appendix 6) The blocking elastic body is an outer tubular portion that constitutes the circuit board contact surface and the rear tubular portion contact surface and is pressed in the Z-axis direction by the circuit board and the front end of the rear tubular portion; an inner tubular portion that forms a front tubular portion contact surface that is in contact with an outer surface of the front tubular portion and elastically fastens the front tubular portion; a connection portion that connects the outer cylinder portion and the inner cylinder portion and allows displacement of the inner cylinder portion relative to the outer cylinder portion in an in-plane direction perpendicular to the Z axis; 6. The display unit according to claim 5, (Appendix 7) The connection portion is The outer cylinder portion extends from a front end portion, which is an end portion of the outer cylinder portion closer to the circuit board in the Z-axis direction, toward the inner cylinder portion. 7. A display unit as described in appended claim 6. (Appendix 8) The connection portion is The outer cylinder portion extends from an intermediate portion between an end portion closer to the circuit board and an end portion closer to the case bottom plate portion in the Z-axis direction toward the inner cylinder portion. 7. A display unit as described in appended claim 6. (Appendix 9) On the circuit board contact surface, a groove recessed rearward from the circuit board contact surface and extending circumferentially around the front tubular portion; The display unit according to any one of appendixes 5 to 8, wherein (Appendix 10) A display device comprising a plurality of display units according to any one of claims 1 to 9, A plurality of the display units are held by the common support member. Display device. [Explanation of symbols]

[0131] 100 Light emitting element, 110R red LED, 110G green LED, 110B blue LED, 120 package member, 130 lead frame, 140 transparent sealing member, 200 circuit board, 211 front surface, 212 back surface, 213 side surface, 220 control circuit, 230 through hole, 300 lens case, 310 plate-shaped main body portion (front plate-shaped member), 311 through hole, 320 lens portion, 330 front side wall portion, 331 tip surface, 340 front cylindrical portion, 341 end portion, 342 protrusion portion, 400 mask plate, 410 mask main body portion, 411 through hole, 420 opening, 430 eaves portion, 500 display main body portion, 510 access hole, 600 unit case, 610 case bottom plate portion, 610a fixing hole, 611 Bottom plate main body portion, 612 rear tubular portion, 620 rear side wall portion, 621 tip surface, 700 blocking elastic body, 700a, 700b gap, 700c groove, 710 outer tubular portion, 711 rear tubular portion contact surface, 712 circuit board contact surface, 713 inner peripheral surface, 714 front end portion, 715 middle portion, 720 inner tubular portion, 721 front tubular portion contact surface, 722 inward protruding portion, 723 outer peripheral surface, 730 connection portion, 741 front tubular portion contact surface, 742 bottom plate main body portion contact surface, 800 display unit, 810 seal member, 900 display device, 910 support housing, 911a fixing hole, 911 back plate portion (support member), 920 display screen, CL separation portion, GP gap, SC Screw (fixture), TL tool, VL virtual center axis.

Claims

1. A display unit fixed to a support member, a display main body that displays images and has a plurality of light-emitting elements each emitting visible light and a circuit board on which the plurality of light-emitting elements are arranged; a unit case fixed to the support member while holding the display main body; Equipped with The unit case is a case bottom plate portion interposed between the display main body portion and the support member and facing the display main body portion and the support member, the case bottom plate portion having a fixing hole through which a fixing tool for fixing the case bottom plate portion to the support member is inserted; having The display main body includes: an access hole for allowing a tool to reach the fixing hole or the fixing tool inserted in the fixing hole from the outside; A display unit is formed.

2. With respect to the Z-axis direction parallel to the direction in which the case bottom plate portion and the display main body portion face each other, when the direction from the case bottom plate portion toward the display main body portion is defined as the front, and the direction from the display main body portion toward the case bottom plate portion is defined as the rear, The display main body portion includes: a front plate-shaped member disposed forward of the circuit board and having a through hole that constitutes a portion of the access hole in the Z-axis direction; a front cylindrical portion that constitutes an inner surface of the access hole, the front cylindrical portion extending rearward from a position of the through hole of the front plate member toward the case bottom plate portion and penetrating the circuit board; The display unit according to claim 1 , comprising:

3. a blocking elastic body that watertightly blocks the gap between the front cylindrical portion and the case bottom plate portion; The display unit of claim 2 further comprising:

4. A gap is provided between the circuit board and the case bottom plate, the rear end of the front tubular portion is disposed in the gap, The case bottom plate portion is a bottom plate body portion facing the circuit board and having the fixing hole formed therein; a rear tubular portion extending forward from the bottom plate body portion and surrounding the fixing hole; having The blocking elastic body is a rear cylindrical portion contact surface that contacts the rear cylindrical portion and a front cylindrical portion contact surface that contacts the front cylindrical portion, and a gap between the rear cylindrical portion and the front cylindrical portion is watertightly closed. The display unit according to claim 3.

5. a projection area of ​​the front tubular portion projected onto the bottom plate main body in the Z-axis direction is disposed inside the rear tubular portion, The blocking elastic body is The circuit board further has a circuit board contact surface that is in contact with a back surface of the circuit board facing the bottom plate main body portion, and is arranged in a state where the circuit board is pressed in the Z-axis direction by the front end portion of the rear cylindrical portion. A display unit according to claim 4.

6. The blocking elastic body is an outer tubular portion that constitutes the circuit board contact surface and the rear tubular portion contact surface and is pressed in the Z-axis direction by the circuit board and the front end portion of the rear tubular portion; an inner tubular portion that forms a front tubular portion contact surface that is in contact with an outer surface of the front tubular portion and elastically fastens the front tubular portion; a connection portion that connects the outer cylinder portion and the inner cylinder portion and allows displacement of the inner cylinder portion relative to the outer cylinder portion in an in-plane direction perpendicular to the Z axis; The display unit according to claim 5 , comprising:

7. The connection portion is The outer cylinder portion extends from a front end portion, which is an end portion of the outer cylinder portion closer to the circuit board in the Z-axis direction, toward the inner cylinder portion. A display unit according to claim 6.

8. The connection portion is the outer cylinder portion extends from an intermediate portion between an end portion closer to the circuit board and an end portion closer to the case bottom plate portion in the Z-axis direction toward the inner cylinder portion; A display unit according to claim 6.

9. On the circuit board contact surface, a groove recessed rearward from the circuit board contact surface and extending circumferentially around the front tubular portion; The display unit according to claim 5 , wherein

10. A display device comprising a plurality of display units according to any one of claims 1 to 9, A plurality of the display units are held by the common support member. Display device.

Images