Display unit and display device

Abstract

To provide a display unit and a display device which are reduced in thickness and weight.SOLUTION: The display unit comprises: a circuit board 20; a light-emitting element 30 mounted on a front face 22 of the circuit board 20; a control device 90 mounted on a rear face 23 opposite the front face 22 of the circuit board 20 and controlling turning on / off of the light-emitting element 30; and a support plate 40 including a convex part 70 arranged facing the rear face 23 of the circuit board 20 and projecting toward the circuit board 20, and a concave part 80 surrounded at its periphery by the convex part 70 and concaved deeper than the convex part 70. The support plate 40 supports the circuit board 20 disposed on the convex part 70. The control device 90 is housed in a housing space 91 defined by the concave part 80.SELECTED DRAWING: Figure 5

Description

[Technical field]

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

[0002] There is a known large display device that combines the display surfaces of multiple display units arranged in a grid pattern to form one large display surface. For example, the large display device described in Patent Document 1 uses a resin molded product for the case that holds the various parts of the display unit. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2018 / 138892 Summary of the Invention [Problem to be solved by the invention]

[0004] The large display device disclosed in Patent Document 1 is intended for outdoor use and needs to withstand wind loads during strong winds. To counter this, the resin case needs to be reinforced and the housing of the large image display device needs to be made robust, which tends to make the display unit and display device large and heavy.

[0005] The present disclosure has been made to solve the above-mentioned problems, and has an object to provide a display unit and a display device that are thinner and lighter than conventional display units. [Means for solving the problem]

[0006] A display unit according to the present disclosure includes a circuit board, a light-emitting element mounted on a first surface of the circuit board, a control device mounted on a second surface of the circuit board opposite to the first surface and controlling the lighting of the light-emitting element, and a support plate disposed opposite to the second surface of the circuit board and having a convex portion protruding toward the circuit board and a concave portion surrounded by the convex portion and recessed deeper than the convex portion. The support plate supports the circuit board placed on the convex portion, and the control device is accommodated in an accommodation space defined by the concave portion. Effect of the Invention

[0007] According to the present disclosure, by forming a protrusion and a recess in the support plate, the mechanical strength of the support plate can be increased, thereby making the support plate itself thinner, and the control device that controls the lighting of the light-emitting elements can be accommodated in the recess in the support plate. This makes it possible to provide a display unit and display device that are thinner and lighter than conventional display units. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a plan view of a display unit according to a first embodiment of the present disclosure; [Diagram 2] A cross-sectional view of the display unit taken along line II-II in FIG. [Diagram 3] An exploded cross-sectional view of the display unit shown in FIG. [Figure 4] A cross-sectional view of the display unit taken along the line IV-IV in FIG. [Diagram 5] FIG. 5 is an exploded perspective view of the display unit shown in FIG. 4. [Figure 6] FIG. 1 is a plan view of a support plate of a display unit according to a first embodiment of the present disclosure. [Figure 7] 7 is a cross-sectional view showing the manufacturing process of the support plate shown in FIG. 6 in the order of steps ((a) to (d)). [Figure 8] FIG. 1 is a perspective view of a display device in which display units are arranged in a grid pattern according to a first embodiment of the present disclosure; [Figure 9] FIG. 11 is a plan view of a display unit according to a second embodiment of the present disclosure. [Figure 10]Cross-sectional view of the display unit taken along line XX in FIG. 9. [Figure 11] FIG. 11 is a plan view showing a support plate of another example of the display unit; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, a display unit and a display device according to an embodiment of the present disclosure will be described with reference to the drawings. For ease of understanding, it is assumed that the display unit 10 is installed outdoors with its front surface perpendicular to the ground, and a right-handed coordinate system is defined in which the direction parallel to the ground and the front surface of the display unit 10 is the X-axis direction, the direction perpendicular to the ground is the Y-axis direction, and the direction perpendicular to the X-axis direction and the Y-axis direction is the Z-axis direction. The description will be given with reference to this coordinate system as appropriate. Note that the +Z direction indicated by an arrow in the Z-axis direction is the direction in which the display unit 10 displays an image.

[0010] (Embodiment 1) 2 and 4, the display unit 10 includes a circuit board 20 with its first surface, or front surface 22, facing the +Z direction, a support plate 40 supporting the circuit board 20, a waterproof film 50 covering the circuit board 20 and various electronic components mounted on the circuit board 20, and a mask 60 covering the front surface 22 of the circuit board 20 covered with the waterproof film 50. The circuit board 20 also includes a light-emitting element 30 mounted on the front surface 22, and a control device 90 shown in FIG. 4 mounted on a back surface 23, or second surface, opposite the front surface 22.

[0011] The circuit board 20 has a rectangular planar shape with its longitudinal direction oriented in the X-axis direction and its lateral direction oriented in the Y-axis direction, and is made of an insulating resin material. Other materials that may be used for the circuit board 20 include glass fiber or ceramics. On the back surface 23 of the circuit board 20, wiring (not shown) and electrodes 24 shown in FIG. 4 are formed. The wiring (not shown) and the electrodes 24 are electrically connected. Also, on the front surface 22 of the circuit board 20, electrodes 25 are formed as shown in FIGS. 2 and 4. The wiring (not shown) and the electrodes 25 are electrically connected through vias 20a formed in the circuit board 20.

[0012] The light emitting elements 30 are connected to electrodes 25 formed on the circuit board 20. The light emitting elements 30 are, for example, surface mount type LED elements, and are arranged on the surface 22 of the circuit board 20 in a 4 row by 6 column grid pattern.

[0013] The light-emitting element 30 has a red LED (Light-Emitting Diode) that emits red light, a green LED that emits green light, and a blue LED that emits blue light (not shown). The three LEDs are independently adjusted by power supplied to each of them via the electrodes 25. This allows the light-emitting element 30 to emit light of any color with any intensity. As a result, a color image is displayed on the display unit 10 by the multiple light-emitting elements 30.

[0014] 3 and 5, the waterproof film 50 covers the light emitting element 30, the front surface 22 of the circuit board 20, the side surface 26 of the circuit board 20, and the rear surface peripheral portion 23a of the circuit board 20. The waterproof film 50 is made of a translucent resin such as polyester resin, polycarbonate resin, acrylic resin, or olefin resin. This allows the light from the light emitting element 30 to pass through the waterproof film 50.

[0015] The waterproof film 50 is soft and flexible. The thickness of the waterproof film 50 is, for example, 50 μm to 500 μm, and from the viewpoint of flexibility and durability, preferably 150 μm to 300 μm. This allows the waterproof film 50 to be attached in accordance with the shapes of the light-emitting element 30 and the circuit board 20, and the surfaces of the light-emitting element 30 and the circuit board 20 can be protected from rainwater, moisture in the air, and the like.

[0016] 1, the mask 60 has a rectangular shape in a plan view, and covers the surface 22 of the circuit board 20 from the +Z side. The mask 60 has an opening 60a formed at a position corresponding to the light-emitting element 30, which exposes the light-emitting element 30 covered by the waterproof film 50. As a result, light from the light-emitting element 30 is emitted from the display unit 10 through the opening 60a.

[0017] The mask 60 is made of, for example, black resin. The mask 60 blocks light incident on the display unit 10 from outside the display unit 10, improving the contrast of the display of the display unit 10. The mask 60 is fixed to the circuit board 20 by fastening screws 35 to an attachment (not shown) attached to the circuit board 20, as shown in Figs. 3 and 5.

[0018] The control device 90 shown in Fig. 4 and Fig. 5 is connected to an electrode 24 formed on the rear surface 23 of the circuit board 20. The control device 90 controls the lighting of a plurality of light-emitting elements 30 arranged in a grid pattern. The control device 90 may include integrated circuits (ICs (Integrated Circuits)) such as a scanning circuit, a driving circuit, or a control circuit. The control device 90 may include a plurality of these circuits or may include only one circuit.

[0019] The support plate 40 is made of metal such as aluminum or stainless steel, and has a rectangular shape in plan view. As shown in FIG. 5, the support plate 40 has an uneven surface, and a convex portion 70 protruding in the +Z direction and a concave portion 80 recessed in the -Z direction from the convex portion are formed adjacent to each other. In this way, the formation of the convex portion 70 and the concave portion 80 improves the mechanical strength of the support plate 40. In addition, the support plate 40 has a side wall 43 that is bent and erected in the +Z direction and is formed around the entire outer edge of the support plate 40. As shown in FIG. 6, the side wall 43 surrounds the periphery of the convex portion 70 and the concave portion 80 formed on the support plate 40. In addition, in the plan view in FIG. 6, the convex portion 70 is hatched so that the range of the convex portion 70 and the concave portion 80 surrounded by the convex portion 70 can be easily understood. Therefore, the hatching shown in FIG. 6 does not represent a cross section.

[0020] The convex portion 70 is adjacent to the inside of the side wall 43 and has a peripheral convex portion 71 that extends parallel to the four sides of the outer periphery around the outer edge of the support plate 40, a longitudinal convex portion 72 that extends parallel to the X-axis, and a transverse convex portion 73 that extends parallel to the Y-axis.

[0021] The outer circumferential protrusion 71 has long sides 71a and 71b arranged parallel to each other along the X-axis direction, and short sides 71c and 71d arranged parallel to each other along the Y-axis direction. The long sides 71a and 71b connect the ends of the short sides 71c and 71d to each other.

[0022] The longitudinal protrusions 72 are protrusions that extend continuously in a straight line and connect one short side 71c and the other short side 71d of the outer circumferential protrusion 71. Seven longitudinal protrusions 72 are formed in the support plate 40, which are parallel to each other and spaced at different intervals. The seven longitudinal protrusions 72 do not have the same width, and some of the longitudinal protrusions 72 have different widths. By forming the longitudinal protrusions 72 that traverse the support plate 40 along the longitudinal direction in this manner, the mechanical strength of the support plate 40 can be increased.

[0023] The short-side protrusion 73 is a protrusion that extends continuously in a straight line and connects one long side portion 71a and the other long side portion 71b of the outer circumferential protrusion 71. The support plate 40 has one short-side protrusion 73 formed in the center in the X-axis direction. By forming the short-side protrusion 73 that runs vertically along the short side direction of the support plate 40 in this manner, the mechanical strength of the support plate 40 can be increased.

[0024] Furthermore, the protrusion 70 has protrusions 73a and 73b that extend in the Y-axis direction and are shorter than the short-side protrusion 73. The protrusions 73a and 73b are disposed symmetrically with respect to the center line CL of the support plate 40 that is perpendicular to the X-axis direction.

[0025] In addition, as shown in FIG. 5, the protrusion 70 is formed with a flange 41 that rises in the −Z direction and has a female thread formed on the inner peripheral surface by burring. As shown in FIG. 6, a plurality of flanges 41 are formed on the longitudinal protrusion 72 along the X-axis direction, which is the extension direction of the longitudinal protrusion 72. In FIG. 6, the flange 41 is illustrated as a hollow circle so that it can be distinguished from the clinching nut 45 illustrated as a filled circle. The flange 41 having the female thread is used to fasten the circuit board 20 to the support plate 40. That is, the screw 27 inserted into the circuit board 20 shown in FIG. 5 is screwed into the female thread formed on the flange 41. As a result, the circuit board 20 is fixed onto the protrusion 70 of the support plate 40.

[0026] 3 and 5, an insulating film 55 is disposed between the circuit board 20 and the protruding portion 70. The insulating film 55 matches the shape of the protruding portion 70 in a plan view, and an opening 55a is formed in a portion corresponding to the recessed portion 80 as shown in Fig. 5. The insulating film 55 is attached to the protruding portion 70, for example, and prevents the wiring formed on the back surface of the circuit board 20 from shorting out.

[0027] As shown in Fig. 6, the recess 80 is surrounded on all four sides by the protrusions 70 extending in the X-axis direction and the Y-axis direction, and thus has a rectangular shape in a plan view. A plurality of recesses 80 are formed in the support plate 40, and are formed in various sizes depending on the intervals between adjacent protrusions 70 in the X-axis direction and the Y-axis direction. A clinching nut 45 is press-fitted into the recess 80 of the support plate 40. The clinching nut 45 is used when attaching the display unit 10 shown in Fig. 1 to the housing of a large display device.

[0028] 5, the recess 80 defines an accommodation space 91 that accommodates the control device 90 provided on the back surface of the circuit board 20. The recess 80 is formed so as to provide a gap of, for example, 0.5 mm or more around the accommodated control device 90. The depth of the recess 80 is, for example, 4 mm.

[0029] A thermally conductive resin 95 is provided in the gap between the recess 80 and the control device 90. The thermally conductive resin 95 fills the entire gap between the recess 80 and the control device 90. As a result, the thermally conductive resin 95 is in contact with both the control device 90 and the support plate 40, and dissipates heat generated in the control device 90 to the outside through the support plate 40.

[0030] 6, the protrusions 70 and recesses 80 formed on the support plate 40 are formed symmetrically with respect to the center line CL of the support plate 40 that is perpendicular to the X-axis. This prevents asymmetric deviation from occurring in the mechanical strength of the support plate 40.

[0031] As shown in Figs. 3 and 5, the side wall 43 protrudes in the +Z direction from the convex portion 70. As a result, a space for accommodating the circuit board 20 is formed in the support plate 40, which is partitioned by the inner wall 43a of the side wall 43 and the convex portion 70. The circuit board 20 covered with the waterproof film 50 is placed on the convex portion 70 and is installed with the side surface 26 abutting against the inner wall 43a of the side wall 43. As a result, the periphery of the circuit board 20 supported by the support plate 40 is surrounded by the side wall 43. In addition, an adhesive 96 is interposed between the side surface 26 of the circuit board 20 and the inner wall 43a of the side wall 43. By attaching the periphery of the circuit board 20 to the side wall 43 all around through the adhesive 96, it is possible to prevent water from entering between the circuit board 20 and the support plate 40, and the waterproofness of the display unit 10 can be ensured. Incidentally, instead of the pressure sensitive adhesive 96, an adhesive may be used to bond the circuit board 20 and the support plate 40 together.

[0032] Next, a manufacturing method of the support plate 40 will be described with reference to FIG. 7. First, as shown in FIG. 7(a), a plate 46 made of, for example, aluminum is prepared. Next, as shown in FIG. 7(b), the plate 46 is pressed against a die using a press machine to form a convex portion 70 and a concave portion 80. The outer edge portion 45a of the plate 46 is an unprocessed portion where the convex portion 70 is not formed. Next, as shown in FIG. 7(c), the convex portion 70 of the plate 46 is burred to form a flange 41 and a female thread is formed in the flange 41. Also, the clinching nut 45 shown in FIG. 6 is pressed into the concave portion 80 of the plate 46. Finally, as shown in FIG. 7(d), the concave portion 80 that houses the control device 90 (FIG. 4) is filled with a thermally conductive resin 95, and the outer edge portion 45a of the plate 46 is bent inward to form a side wall 43. This allows the support plate 40 to be manufactured.

[0033] An insulating film 55 is placed between the support plate 40 and the circuit board 20 manufactured in this manner, and the circuit board 20 is placed on the protrusion 70 of the support plate 40. Then, the screw 27 shown in FIG. 5 that has been inserted into the circuit board 20 is screwed into the female thread formed on the flange 41. This allows the circuit board 20 to be fixed onto the protrusion 70 of the support plate 40. Finally, the gap between the circuit board 20 and the side wall 43 is filled with adhesive 96, thereby manufacturing the display unit 10.

[0034] A large display device 100 having one large display surface can be manufactured by arranging and combining a plurality of display units 10 manufactured in this manner in a lattice pattern. As shown in FIG. 8, the display device 100 includes, for example, 12 display units 10 arranged in a lattice pattern and a housing 200 that houses these 12 display units 10. The housing 200 has a lattice frame 230, and screws (not shown) inserted into the lattice frame 230 are tightened to clinching nuts 45 shown in FIG. 6. This allows a plurality of display units 10 to be attached to the housing 200. The display device 100 is installed indoors and outdoors, such as in stadiums and on the walls of buildings.

[0035] According to the first embodiment, the support plate 40 having an uneven shape is formed by pressing a metal plate, and therefore the mechanical strength of the support plate 40 can be increased. In particular, a pressed metal has a flow of fibrous metal structure, so-called grain flow lines, and therefore the mechanical strength is improved compared to a cut metal. By using the support plate 40 formed by pressing a metal plate, the support plate 40 itself can be made thin, and there is no need to provide a separate reinforcing member for the support plate 40 or to make the housing of the display device robust, and the display unit and the display device can be made thin and lightweight.

[0036] Moreover, the control device 90, which is an electronic component mounted on the circuit board 20, can be accommodated in the recess 80 formed to increase the mechanical strength of the support plate 40. Therefore, there is no need to provide an additional storage space for accommodating the control device 90, and the display unit and the display device can be made thinner.

[0037] Furthermore, by providing outer peripheral protrusion 71 that extends parallel to the four sides of the periphery of support plate 40, the outer edge of support plate 40 can be reinforced.

[0038] In addition, the support plate 40 is formed with a longitudinal convex portion 72 that extends continuously in a straight line and connects one short side portion 71c and the other short side portion 71d of the outer peripheral convex portion 71. In addition, the support plate 40 is formed with a transverse convex portion 73 that extends continuously in a straight line and connects one long side portion 71a and the other long side portion 71b of the outer peripheral convex portion 71. This makes it possible to reinforce the area surrounded by the outer peripheral convex portion 71 with the longitudinal convex portion 72 and the transverse convex portion 73, thereby improving the mechanical strength of the support plate 40 over the entire surface.

[0039] In addition, the number of longitudinal convex portions 72 is greater than the number of lateral convex portions 73. This makes it possible to further improve the mechanical strength in the longitudinal direction of the support plate 40 where greater mechanical strength is required.

[0040] Moreover, the protrusions 70 and the recesses 80 are formed symmetrically with respect to the center line CL in the X-axis direction of the support plate 40. This prevents asymmetric bias in the mechanical strength of the support plate 40. This makes it possible to eliminate locally weak areas in the support plate 40.

[0041] Moreover, the four sides of the outer periphery of the support plate 40 are bent in the direction in which the convex portion 70 protrudes, forming side walls 43. These side walls 43 can improve the mechanical strength of the outer edge of the support plate 40. Furthermore, by interposing an adhesive 96 between the side surface 26 of the circuit board 20 and the inner wall 43a of the side wall 43, it is possible to prevent water from entering between the circuit board 20 and the support plate 40, and the waterproofing of the display unit 10 can be ensured.

[0042] In addition, the recess 80 that houses the control device 90 attached to the circuit board 20 is filled with thermally conductive resin 95. This allows the thermally conductive resin 95 to be in contact with both the control device 90 and the support plate 40, and allows heat generated in the control device 90 to be dissipated to the outside through the support plate 40.

[0043] (Embodiment 2) Next, a display unit and a display device according to a second embodiment will be described with reference to Figs. 9 and 10. In the first embodiment, it has been described that the support plate 40 has a side wall 43 standing around the outer edge, but the support plate 140 of the display unit 110 of the second embodiment has no side wall, and an outer peripheral protrusion 71 is formed on the outermost edge as shown in Fig. 10. On the other hand, since the present embodiment has many components in common with the first embodiment, the common components are denoted by the same reference numerals and redundant explanations will be omitted.

[0044] 10, the circuit board 20 covered with the waterproof film 50 is placed and fixed on a protrusion 70 formed on a support plate 140. The planar dimensions of the circuit board 20 and mask 60 are approximately the same as the planar dimensions of the support plate 140. Therefore, the circuit board 20 is placed on the support plate 140 with its outer edge coinciding with the outer edge of the support plate 140. In this way, since the support plate 140 does not have a sidewall, the +Z side of the support plate 140 is completely covered by the mask 60 and the circuit board 20, as shown in FIG.

[0045] Additionally, an adhesive 150 is interposed between the peripheral edge of the back surface 23 of the circuit board 20 covered with the waterproof film 50 and the outer peripheral convex portion 71 of the support plate 140. The adhesive 150 is formed on the outer peripheral convex portion 71 around the entire outer edge of the support plate 140. This makes it possible to prevent water from entering between the circuit board 20 and the support plate 140, and ensures the waterproofness of the display unit 110.

[0046] The support plate 140 is manufactured by pressing a metal plate, similarly to the manufacturing method in the first embodiment. However, in this embodiment, the support plate 140 is pressed so that the outer peripheral protrusion 71 forms the outermost edge of the support plate 140 during the press working, without forming the outer edge portion 45a, which is the unprocessed portion shown in Fig. 7(b), in the support plate 140. Therefore, the step of forming the side wall 43 is omitted, but the other manufacturing steps of the support plate 140 are the same as those in the first embodiment.

[0047] According to the second embodiment, by forming the outer peripheral protrusion 71 on the outermost edge of the support plate 140, the outer edge of the support plate 140 can be reinforced and the mechanical strength can be improved over the entire surface of the support plate 140. This allows the display unit and the display device to be made thinner and lighter.

[0048] Furthermore, by forming adhesive 150 on outer peripheral protrusion 71 around the entire outer edge of support plate 140, it is possible to prevent water from entering between circuit board 20 and support plate 140, thereby ensuring the waterproofing of display unit 110. Other effects are similar to those of the first embodiment.

[0049] This disclosure is not limited to the above embodiment, and various modifications and applications are possible. In the above embodiment, the longitudinal convex portion 72 is described as extending linearly in a direction parallel to the X-axis to connect one short side portion 71c and the other short side portion 71d of the outer peripheral convex portion 71. However, as long as the mechanical strength of the support plate 40 can be increased, the manner in which the convex portion extends is arbitrary. For example, the convex portion may extend linearly obliquely with respect to the longitudinal direction of the support plate 40, not parallel to the X-axis. Also, as shown in FIG. 11, the longitudinal convex portion 172 of the support plate 140 may extend continuously in a curved shape to connect the short side portion 71c and the short side portion 71d, or may extend in a multiply twisted manner. Similarly, the short side convex portion 173 may extend linearly obliquely with respect to the short side direction of the support plate 40. As shown in Fig. 11, the short-side protrusions 173 of the support plate 140 may extend continuously in a curved shape to connect the long-side portions 71a and 71b, or may extend in a winding manner. Although four long-side protrusions 172 and two short-side protrusions 173 are shown in Fig. 11, the number of the long-side protrusions 172 and the short-side protrusions 173 is not limited, and the number of the long-side protrusions 172 and the short-side protrusions 173 may be changed as appropriate. The long-side protrusions 172 and the short-side protrusions 173 are formed symmetrically with respect to the center line CL of the support plate 140 that is perpendicular to the X-axis direction.

[0050] Also, the planar shape of the display unit 10 has been described as being rectangular with its longer side in the X-axis direction and its shorter side in the Y-axis direction, but the lengths in the X-axis direction and the Y-axis direction may be the same. That is, the planar shape of the display unit may be a square. In this case, the number of protrusions extending in the X-axis direction may be the same as the number of protrusions extending in the Y-axis direction.

[0051] Furthermore, when the length of the display unit 10 in the short direction is much shorter than the length of the display unit 10 in the long direction, the short-side protrusions 73 shown in Fig. 6 can be omitted. That is, the number of the long-side protrusions 72 and the short-side protrusions 73 can be appropriately set according to the shape, size, etc. of the display unit 10.

[0052] In addition, in order to dissipate heat generated by the control device 90, the thermally conductive resin 95 is filled in the entire gap between the control device 90 and the recess 80 that accommodates the control device 90, but it may also be partially filled in a part of the gap between the control device 90 and the support plate 40. The thermally conductive resin 95 may also be placed only in the control device 90 that generates the most heat among the multiple control devices. If sufficient heat dissipation can be ensured, the thermally conductive resin may be omitted. The thermally conductive resin may also be omitted, and the control device and the support plate may be in contact with each other to dissipate heat generated by the control device to the outside.

[0053] Also, in order to prevent short-circuiting of the wiring formed on the rear surface of the circuit board 20, an embodiment in which the insulating film 55 is attached to the convex portion 70 of the support plate 40 has been described. However, the insulating film 55 may be attached to the rear surface of the circuit board. Also, an insulating layer may be formed on the rear surface of the circuit board 20. Also, an insulating spacer may be sandwiched between the circuit board 20 and the convex portion 70 of the support plate 40. Furthermore, the wiring of the circuit board 20 may be formed only in the area facing the concave portion of the support plate. This makes it possible to prevent short-circuiting of the wiring provided on the rear surface 23 of the circuit board 20.

[0054] In this embodiment, only one control device 90 is illustrated and described as an electronic component mounted on the rear surface 23 of the circuit board 20, but a plurality of other electronic components, such as control devices, capacitors, and resistors, are mounted on the rear surface 23 of the circuit board 20. These electronic components are also accommodated in the recess 80 of the support plate 40.

[0055] Various aspects of the present disclosure are summarized below as appendices.

[0056] (Appendix 1) A circuit board; a light emitting element mounted on a first surface of the circuit board; a control device mounted on a second surface of the circuit board opposite to the first surface, the control device controlling lighting of the light emitting element; a support plate disposed opposite the second surface of the circuit board, the support plate having a protruding portion protruding toward the circuit board and a recessed portion surrounded by the protruding portion and recessed further than the protruding portion; the support plate supports the circuit board placed on the protruding portion, The control device is accommodated in an accommodation space defined by the recess. Display unit. (Appendix 2) The support plate has a rectangular shape, The protrusions formed on the support plate include outer peripheral protrusions formed on the outer edge of the support plate and extending parallel to the four sides of the support plate. 2. A display unit as described in appended claim 1. (Appendix 3) The support plate has a longitudinal direction and a lateral direction, The protrusion includes a longitudinal protrusion that extends continuously in a straight line and connects one short side portion of the outer circumferential protrusion to the other short side portion. 2. A display unit as described in appended claim 2. (Appendix 4) The protrusion includes a short-side direction protrusion that extends continuously in a straight line and connects one long side portion and the other long side portion of the outer circumferential protrusion. 2. A display unit as described in appended claim 3. (Appendix 5) The support plate has a longitudinal direction and a lateral direction, The protrusion includes a longitudinal protrusion that extends continuously in a curved line and connects one short side portion of the outer circumferential protrusion to the other short side portion of the outer circumferential protrusion. 2. A display unit as described in appended claim 2. (Appendix 6) The protrusion includes a short-side protrusion that extends continuously in a curved line and connects one long side portion and the other long side portion of the outer circumferential protrusion. 6. A display unit as described in appended claim 5. (Appendix 7) The number of the longitudinal convex portions is greater than the number of the lateral convex portions. 7. A display unit according to claim 4 or 6. (Appendix 8) The shapes of the protrusion and the recess are symmetrical with respect to a center line of the display unit perpendicular to the longitudinal direction. 8. A display unit according to any one of claims 1 to 7. (Appendix 9) A wiring is formed on the second surface of the circuit board only in an area facing the recess of the support plate. 9. A display unit according to any one of claims 1 to 8. (Appendix 10) A thermally conductive resin is provided in the accommodation space in which the control device is accommodated, the thermally conductive resin being in contact with the control device and the support plate. 10. A display unit according to any one of claims 1 to 9. (Appendix 11) A side wall protruding beyond the protruding portion is provided on an outer edge of the support plate, The side wall surrounds the periphery of the circuit board supported by the support plate. 11. A display unit according to any one of claims 1 to 10. (Appendix 12) An adhesive is interposed between the inner peripheral surface of the side wall and the side surface of the circuit board. 12. A display unit as described in claim 11. (Appendix 13) The protruding portion is formed with a flange having a female thread for fastening the circuit board. 13. A display unit according to any one of claims 1 to 12. (Appendix 14) A display unit according to any one of claims 1 to 13 arranged in a grid pattern; A housing for holding the display unit; A display device comprising: (Appendix 15) A nut for fastening the support plate to the housing is provided in the recess. 15. The display device according to claim 14. [Explanation of symbols]

[0057] 10...display unit, 20...circuit board, 20a...via, 22...surface, 23...back surface, 23a...periphery of back surface, 24, 25...electrode, 26...side surface, 27...screw, 30...light-emitting element, 35...screw, 40...support plate, 41...flange, 43...side wall, 43a...inner wall, 45...clinching nut, 45a...outer edge, 46...plate, 50...waterproof film, 55...insulating film, 55a...opening, 60...mask, 60a...opening, 70...convex portion, 71...outer peripheral convex portion, 71a, 71b...longitudinal portions, 71c, 71d...shortitudinal portions, 72...longitudinal convex portion, 73...shortitudinal convex portion, 73a, 73b...convex portion, 80...recess, 90...control device, 91...accommodation space, 95...thermally conductive resin, 96...adhesive, 100...display device, 110...display unit, 140...support plate, 150...adhesive, 172...longitudinal convex portion, 173...shortitudinal convex portion, 200...housing, 230...frame, CL...center line.

Claims

1. A circuit board; a light emitting element mounted on a first surface of the circuit board; a control device mounted on a second surface of the circuit board opposite to the first surface, the control device controlling lighting of the light emitting element; a support plate disposed opposite the second surface of the circuit board, the support plate having a protruding portion protruding toward the circuit board and a recessed portion surrounded by the protruding portion and recessed further than the protruding portion; the support plate supports the circuit board placed on the protruding portion, The control device is accommodated in an accommodation space defined by the recess. Display unit.

2. The support plate has a rectangular shape, The protrusions formed on the support plate include outer peripheral protrusions formed on the outer edge of the support plate and extending parallel to the four sides of the support plate. The display unit according to claim 1 .

3. The support plate has a longitudinal direction and a lateral direction, The protrusion includes a longitudinal protrusion that extends continuously in a straight line and connects one short side portion of the outer circumferential protrusion to the other short side portion. The display unit according to claim 2.

4. The protrusion includes a short-side direction protrusion that extends continuously in a straight line and connects one long side portion and the other long side portion of the outer circumferential protrusion. The display unit according to claim 3.

5. The support plate has a longitudinal direction and a lateral direction, The protrusion includes a longitudinal protrusion that extends continuously in a curved line and connects one short side portion and the other short side portion of the outer circumferential protrusion. The display unit according to claim 2.

6. The protrusion includes a short-side protrusion that extends continuously in a curved line and connects one long side portion and the other long side portion of the outer circumferential protrusion. The display unit according to claim 5.

7. The number of the longitudinal convex portions is greater than the number of the lateral convex portions. A display unit according to claim 4 or 6.

8. The shapes of the protrusion and the recess are symmetrical with respect to a center line of the display unit perpendicular to the longitudinal direction. The display unit according to claim 1 .

9. A wiring is formed on the second surface of the circuit board only in an area facing the recess of the support plate. The display unit according to claim 1 .

10. A thermally conductive resin is provided in the accommodation space in which the control device is accommodated, the thermally conductive resin being in contact with the control device and the support plate. The display unit according to claim 1 .

11. A side wall protruding beyond the protruding portion is provided on an outer edge of the support plate, The side wall surrounds the periphery of the circuit board supported by the support plate. The display unit according to claim 1 .

12. An adhesive is interposed between the inner peripheral surface of the side wall and the side surface of the circuit board. A display unit according to claim 11.

13. The protruding portion is formed with a flange having a female thread for fastening the circuit board. The display unit according to claim 1 .

14. A plurality of the display units according to claim 1 arranged in a lattice pattern; A housing for holding the display unit; A display device comprising:

15. A nut for fastening the support plate to the housing is provided in the recess. The display device according to claim 14.

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