JP2021076756A - Display unit and display device - Google Patents

Abstract

To further reduce the amount of a component fused by a laser beam and flowing out to the outside of a housing case.SOLUTION: A display unit 10 according to the present invention comprises a front case 30 that houses a circuit board 21 and a reverse case 40 joined to the front case 30 by laser welding. The front case 30 has a translucent portion 31 and a surface-side wall 32 and comprises a surface guide 33 in the inside of it. The surface-side wall 32 includes a surface-side wall inner face 32a facing the circuit board 21, a first joint face 32b facing the reverse case 40 and joined to the reverse case 40, and a corner portion 32c connecting the surface-side wall inner face 32a to the first joint face 32b to each other. A reverse guide 43 is provided in the inside of the reverse case 40. The surface guide 33 and the reverse guide 43 both are provided at positions apart form the corner portion 32c.SELECTED DRAWING: Figure 3

Description

The present invention relates to a display unit and a display device.

The display device is configured by arranging a plurality of display units in a matrix. The display unit has a circuit board provided with a plurality of light emitting elements, and displays an image on an image display surface using the light emitted from each light emitting element.

The circuit board is housed in a storage case. The storage case has a box-shaped front case that opens on one side and a back case that covers the opening of the front case. The back case is composed of a light absorbing member and has a flat back wall. The front case is composed of a light-transmitting member, and has a flat plate-shaped translucent wall that faces the back wall and extends parallel to the back wall, and a direction perpendicular to the transmissive wall from the peripheral edge of the translucent wall toward the back case. It has a front side wall that protrudes into.

The circuit board has a mounting surface on which a light emitting element is provided, a back surface of the board located on the opposite side in the thickness direction of the mounting surface and the circuit board, and a side surface of the board connecting the mounting surface and the back surface of the board. The mounting surface is arranged so as to face the translucent wall. The front side wall is provided on the inner surface of the front side wall, which is a surface facing the side surface of the substrate, the outer surface of the front side wall, which is a surface located on the opposite side in the thickness direction of the inner surface of the front side wall and the front side wall, and the back case. It has a first joint surface to be joined and a corner portion connecting the inner surface of the front side wall and the first joint surface. The back case has a second joint surface, which is a surface to which the first joint surface is joined.

Patent Document 1 discloses a configuration relating to a case in which a positioning portion extending perpendicularly to the second joint surface is provided on the peripheral edge of the second joint surface. According to the configuration of Patent Document 1, the arrangement position of the first joint surface on the second joint surface can be determined by bringing the inner surface of the front side wall into contact with the positioning portion.

Japanese Unexamined Patent Publication No. 2008-87811 (see paragraph [0023], FIG. 1).

In recent years, laser welding has been adopted as a method for joining the first joint surface and the second joint surface. In laser welding, after the first joint surface and the second joint surface are brought into contact with each other, the second joint surface is irradiated with laser light to partially melt the second joint surface. In this way, with the second joint surface partially melted, the first joint surface is pressed against the second joint surface to bring the first joint surface and the second joint surface into close contact with each other.

However, in the configuration described in Patent Document 1, when the first joint surface and the second joint surface are to be joined by laser welding, the first joint surface is covered with the positioning portion at the corners of the front side wall. Is pressed against the second joint surface, so that the molten member is extruded to the outer surface side of the front side wall, adheres to the outer surface of the front side wall, and hardens. In this case, the outer shape of the storage case may change. Such a problem is the same even when the configuration of Patent Document 1 is applied to the display unit.

The present invention has been made to solve the above-mentioned problems, and in a display unit having a positioning portion for determining the arrangement position of the first joint surface on the second joint surface, the first joint surface and the second joint surface It is an object of the present invention to obtain a display unit capable of reducing the amount of outflow of a member melted by a laser beam to the outside of a housing case when joining the members by laser welding. Another object of the present invention is to obtain a display device including the display unit.

The display unit according to the present invention has a flat plate-shaped back wall, a back case composed of a light absorbing member, a transparent wall arranged facing the back wall and extending in parallel with the back wall, and a transparent wall. It has a front side wall that extends from the light wall toward the back case in a direction perpendicular to the light-transmitting wall, has a front case composed of a light-transmitting member, and has a mounting surface on which a light emitting element is mounted. It includes a circuit board housed inside the front case so as to face the light-transmitting wall, and the circuit board is located on the back surface of the board opposite to the mounting surface in the thickness direction of the circuit board, and the mounting surface and the board. It has a substrate side surface connecting the back surfaces, and the front side wall is an inner surface of the front side wall facing the side surface of the substrate, a first joining surface facing the back case and being joined to the back case by laser welding, and the inner surface of the front side wall and the first surface. It has corners connecting the joint surfaces, the translucent wall has a translucent inner surface facing the mounting surface, and a plurality of front guides are adjacent to each other among the sides constituting the transmissive inner surface on the translucent inner surface. The front guide has a front guide surface extending perpendicular to the inner surface of the translucent light, and the back case has a second joint surface facing the front guide and extending parallel to the inner surface of the translucent light. However, the first joint surface is joined to the second joint surface, and back guides are provided at positions corresponding to the plurality of front guides, and the back guides extend in the direction perpendicular to the second joint surface and are plurality of. Each has a back guide surface that comes into contact with the front guide surface, and both the front guide and the back guide are provided apart from the corners.

The display unit of the present invention has a front guide and a back guide as positioning portions for determining the arrangement position of the first joint surface on the second joint surface, and the front guide surface is provided on the back guide surface extending perpendicular to the second joint surface. Contact. Since the front guides are provided along two adjacent sides of the translucent inner surface extending parallel to the second joint surface, the front guide surfaces abut on the back guide surface to bring each other on the second joint surface. The arrangement position of the first joint surface in two different directions can be determined. Further, since both the front guide and the back guide are provided apart from the corners of the front side wall, at least a part of the molten member flows into the inside of the storage case through the corners of the front side wall. To do. Therefore, the amount of the molten member flowing out to the outside of the storage case can be reduced as compared with the conventional case.

The perspective view of the display device which concerns on Embodiment 1 of this invention. The front view of the display unit which concerns on Embodiment 1 of this invention. FIG. 2 is a cross-sectional view taken along the line AA of FIG. A perspective view of the front case according to the first embodiment as viewed from the back side. 5 (a) is a rear view of the front case according to the first embodiment of the present invention, FIG. 5 (b) is a front view of the back case according to the first embodiment of the present invention, and FIG. 5 (c) is a front view of the back case. A front view of the circuit board according to the first embodiment, FIG. 5D is a front view showing a state in which the back case is arranged on the front case in the manufacturing process of the display unit according to the first embodiment. FIG. 3 is a cross-sectional view corresponding to FIG. 3 of the display unit according to the second embodiment of the present invention. 7 (a) is a partially enlarged cross-sectional view of region B of FIG. 6 showing a state in which the front case is arranged in the back case in the manufacturing process of the display unit according to the second embodiment, and FIG. 7 (b) is a partially enlarged cross-sectional view. FIG. 6 is a partially enlarged cross-sectional view of a region B of FIG. 6 of the display unit according to the second embodiment. FIG. 3 is a cross-sectional view corresponding to FIG. 3 of the display unit according to the third embodiment of the present invention. FIG. 3 is a cross-sectional view corresponding to FIG. 3 of the display unit according to another embodiment. FIG. 3 is a cross-sectional view corresponding to FIG. 3 of the display unit according to another embodiment. FIG. 3 is a cross-sectional view corresponding to FIG. 3 of the display unit according to another embodiment.

A mode for carrying out the present invention will be described with reference to the accompanying drawings. In each figure, the same or corresponding parts are designated by the same reference numerals, and the duplicated description thereof will be appropriately simplified or omitted. Further, for convenience of explanation, the size of the portion shown in each figure, the proportional relationship of the shape, and the like may be exaggerated.

(Embodiment 1)
The display unit 10 and the display device 100 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 5.
FIG. 1 is a perspective view of the display device 100 according to the first embodiment of the present invention. As shown in FIG. 1, the display device 100 according to the first embodiment is configured by arranging a plurality of display units 10 for displaying images in a matrix.

The display device 100 is installed on a highway or a general road to display warning information or various road information. It can also be installed in an outdoor stadium or the like.
Each display unit 10 is fixed to the support frame 200 by screwing or the like in a state where the image display surface 11, which is the surface on which the image of each display unit 10 is displayed, is arranged so as to face the front of the display device 100. ing.

As shown in FIGS. 2, 3 and 4, the display unit 10 has a circuit board 21 extending parallel to the image display surface 11 and a storage case 70 for accommodating the circuit board 21. The storage case 70 has a box-shaped front case 30 having an opening on one side and a back case 40 covering the opening of the front case 30.

The front case 30 is made of a light-transmitting member. For example, it is manufactured by injection molding a transparent resin such as a polycarbonate resin or an acrylic resin. Further, the front case 30 is a flat plate-shaped translucent wall 31 constituting the image display surface 11 and a front surface protruding from the peripheral edge of the translucent wall 31 toward the back case 40 in a direction perpendicular to the translucent wall 31. It has a side wall 32.

Since the front case 30 may be made of a translucent member, the members constituting the front case 30 are not limited to resin. For example, glass, ceramic, or the like can be appropriately adopted. Further, the molding method is not limited to injection molding, and can be appropriately selected from known molding methods such as extrusion molding and blow molding.

The circuit board 21 is housed inside the front case 30. The circuit board 21 is made of an insulating resin, glass, ceramic, or the like. The circuit board 21 has a mounting surface 21a on which the light emitting element 23 is provided, a substrate back surface 21b located on the opposite side of the mounting surface 21a and the circuit board 21 in the thickness direction, and a substrate side surface 21c connecting the mounting surface 21a and the substrate back surface 21b. The mounting surface 21a is arranged so as to face the translucent wall 31 and the mounting surface 21a extends parallel to the translucent wall 31.

The light emitting element 23 is composed of an LED element. The LED element constituting the light emitting element 23 may be a 3in1 type surface mount type LED element or a 1in1 type surface mount type LED element. Alternatively, it may be a COB type LED element in which the chip is directly mounted on the mounting surface 21a. The light emitting element 23 emits light of an arbitrary color and an arbitrary intensity toward the translucent wall 31.

Next, the table case 30 will be described in detail. As described above, the front case 30 has a translucent wall 31 and a front side wall 32. The translucent wall 31 has a translucent inner surface 31a facing the mounting surface 21a, and a translucent outer surface 31b located on the opposite side of the translucent inner surface 31a and the translucent wall 31 in the thickness direction.

A plurality of condenser lenses 37 are provided on the translucent outer surface 31b. Each condenser lens 37 is provided at a position corresponding to each light emitting element 23. The condenser lens 37 collects the light emitted from the light emitting element 23 and emits it to the outside.

The front side wall 32 faces the front side wall inner surface 32a facing the substrate side surface 21c, the front side wall outer surface 32d located on the opposite side in the thickness direction of the front side wall inner surface 32a and the front side wall 32, and the back case 40 as well as facing the back case 40. It has a first joint surface 32b to be joined, and a corner portion 32c connecting the inner surface 32a of the front side wall and the first joint surface 32b.

A front guide 33 is provided inside the front case 30. The front guide 33 is configured to be connected to the light-transmitting inner surface 31a and the front side wall inner surface 32a, and has the first front guide surface 33a. The first front guide surface 33a is provided at a position separated from the inner surface 32a of the front side wall, and is configured to extend perpendicularly to the inner surface of the translucent light 31a.

Assuming that the direction perpendicular to the light-transmitting wall 31 is the thickness direction D1 of the display unit 10, the dimension L1 in the thickness direction D1 of the front guide 33 is larger than the dimension L2 in the thickness direction D1 of the front side wall 32. Is also short. Further, as described above, the table guide 33 is connected to the translucent inner surface 31a. Therefore, the front guide 33 is provided apart from the corner portion 32c.

Further, as shown in FIG. 5A, a plurality of table guides 33 are provided inside the table case 30. Each table guide 33 is provided along two sides 31Lc and side 31Ld that are adjacent to each other among the four sides 31La, 31Lb, 31Lc, and 31Ld that form the translucent inner surface 31a.

Further, as shown in FIG. 5C, the circuit board 21 is provided with a plurality of accommodating portions 22. Each accommodating portion 22 is provided at a position corresponding to each table guide 33. The circuit board 21 is arranged so that each table guide 33 penetrates each accommodating portion 22.

In the display unit 10, when the display unit 10 is visually recognized from the front, it is preferable that the area of the circuit board 21 occupying the image display surface 11 is large. When the circuit board 21 does not have the accommodating portion 22, the front guide 33 is provided so that the circuit board 22 cannot be brought into contact with the inner surface 32a of the front side wall. However, according to the first embodiment, Since the front guide 33 is provided so as to penetrate the accommodating portion 22, at least a part of the circuit board 21 can be brought into contact with the inner surface 32a of the front side wall. Therefore, the size of the circuit board 21 occupying the image display surface 11 can be made larger than that in the case where the accommodating portion 22 is not provided.

Next, the back case 40 will be described in detail. The back case 40 is manufactured by coloring a resin such as a polycarbonate resin or an acrylic resin and injection molding. The member constituting the back case 40 is not particularly limited as long as it is a member having light absorption and thermoplasticity, but resin, metal, or the like is preferable. In particular, since a black member having high light absorption is preferable, it is preferable to add an auxiliary material such as carbon black to resin or metal to make it black. Further, the molding method is not limited to injection molding, and can be appropriately selected from known molding methods such as extrusion molding and blow molding.

The back case 40 has a back wall 41 extending parallel to the translucent wall 31. The back wall 41 and the translucent wall 31 are provided so as to face each other with the circuit board 21 interposed therebetween. In the first embodiment, the back case 40 is a flat plate-shaped member composed of the back wall 41.
As shown in FIG. 3, the back wall 41 has a second joint surface 41a that faces the light-transmitting inner surface 31a and extends parallel to the light-transmitting inner surface 31a. As described above, since the front guide 33 is provided inside the front case 30, the second joint surface 41a also faces the front guide 33.

A back guide 43 is provided on the second joint surface 41a at a position separated from the front side wall 32. That is, the back guide 43 is provided at a position separated from the corner portion 32c constituting the front side wall 32. Further, the first joint surface 32b of the front side wall 32 is joined to the second joint surface 41a. In the second joint surface 41a, the region where the first joint surface 32b joins is configured as a joint portion 41b.

As shown in FIG. 5B, the back guide 43 has a first back guide surface 43a and a second back guide surface 43b. The first back guide surface 43a and the second back guide surface 43b are configured to extend in directions orthogonal to each other on the second joint surface 41a.
Further, as shown in FIG. 3, the first back guide surface 43a is configured to extend perpendicularly to the second joint surface 41a. Although not shown in FIG. 3, the second back guide surface 43b is also configured to extend perpendicularly to the second joint surface 41a, similarly to the first back guide surface 43a.

Next, the procedure for joining the front case 30 and the back case 40 will be described with reference to FIG. 5 (d). When joining the front case 30 and the back case 40, first, as shown in FIG. 5D, the front case 30 and the back case 40 are so that the translucent inner surface 31a and the second joint surface 41a face each other. Deploy. At this time, the first joint surface 32b of the front side wall 32 is arranged so as to abut the second joint surface 41a of the back wall 41.

Next, the front case 30 is moved along the second joint surface 41a, and the first back guide surface 43a of the back guide 43 and the first front guide surface 33a of the front guide 33 provided along the side 31Ld are contacted with each other. Get in touch. Next, the second back guide surface 43b of the back guide 43 and the first front guide surface 33a of the front guide 33 provided along the side 31La are brought into contact with each other. Thereby, the arrangement position of the front case 30 in two different directions on the second joint surface 41a is determined.

Next, the laser beam is emitted toward the joint portion 41b from the front case 30 side. The laser beam passes through the front side wall 32 and enters the joint portion 41b to heat the joint portion 41b. As a result, the joint portion 41b is melted.
After pressing the first joint surface 32b against the joint portion 41b in the molten state in this way, the joint portion 41b is cooled.

According to the first embodiment described above, the following effects can be obtained.
(1) Since both the front guide 33 and the back guide 43 are provided at positions separated from the corner portion 32c, the first joint surface 32b is pressed against the joint portion 41b melted by irradiation with laser light. At that time, at least a part of the molten resin passes through the corner portion 32c and flows into the inside of the storage case 70. Therefore, the amount of the molten resin outflow to the outside of the storage case 70 can be reduced as compared with the conventional case.

(2) In the first embodiment, the display unit 10 has a front guide 33 and a back guide 43 as positioning portions for determining the arrangement position of the first joint surface 32b on the second joint surface 41a. The front guide surfaces 33a come into contact with the back guide surfaces 43a and 43b extending perpendicularly to the second joint surface 41a. Since the front guide 33 is provided along two adjacent sides of the translucent inner surface 31a extending parallel to the second joint surface 41a, the front guide surface 33a abuts on the back guide surfaces 43a and 43b. The arrangement position of the first joint surface 41a in two different directions on the second joint surface 41a can be determined.

(Embodiment 2)
The display unit 10 and the display device 100 of the second embodiment will be described focusing on the differences from the first embodiment with reference to FIGS. 1 to 5 and 6 and 7 above. Unless otherwise specified, the same reference numerals indicate the same configurations, and detailed description thereof will be omitted as appropriate.

As shown in FIG. 6, the table guide 33 according to the second embodiment includes the first table guide surface 33a, the second table guide surface 33b facing the first table guide surface 33a, and the first table guide surface 33a. It has a third table guide surface 33c (“stopper surface” shown in the claims) connecting the second table guide surface 33b. The second table guide surface 33b is configured to extend parallel to the first table guide surface 33a. The guide surface 33c of Table 3 is configured to extend parallel to the light transmitting inner surface 31a.

Further, as described in the first embodiment, the table guide 33 has two sides adjacent to each other among the four sides 31La, the side 31Lb, the side 31Lc, and the side 31Ld constituting the translucent inner surface 31a. It is provided along the side 31Lc and the side 31Ld.

In the second embodiment, the arrangement position of the back case 40 with respect to the front case 30 can be determined by inserting the back guide 43 between the first front guide surface 33a and the second front guide surface 33b. The back guide 43 is accommodated between the first front guide surface 33a and the second front guide surface 33b in a state of being sandwiched between the first front guide surface 33a and the second front guide surface 33b.

According to the above-described second embodiment, in addition to the effects (1) and (2) described in the first embodiment, the following effects can be obtained.

(3) In the second embodiment, since the back guide 44 is sandwiched between the first front guide surface 33a and the second front guide surface 33b, the back case 40 is first placed during the joining operation by laser welding. It is possible to suppress the deviation in the direction perpendicular to the front guide surface 33a and the second front guide surface 33b.

(4) When joining the front case 30 and the back case 40 by laser welding, first, as shown in FIG. 7A, the front case 30 and the front case 30 are brought into contact with the first joining surface 32b so as to come into contact with the joining portion 41b. The back case 40 is arranged. After that, the joint portion 41b is irradiated with a laser beam to be melted, and the first joint surface 32b is pressed against the joint portion 41b in the melted state. At this time, since the joint portion 41b is in a molten state, the translucent wall 31 and the back wall 41 move in a direction close to each other, and as shown in FIG. 7B, the back guide 43 is the third front guide surface 33c. Contact. In this way, when the back guide 43 comes into contact with the third front guide surface 33c, the relative arrangement positions of the front case 30 and the back case 40 in the thickness direction D1 of the display unit 10 are determined. Therefore, it is possible to prevent the relative arrangement positions of the front case 30 and the back case 40 in the thickness direction D1 of the display unit 10 from being scattered for each display unit 10.

(Embodiment 3)
The display unit 10 and the display device 100 of the fourth embodiment will be described focusing on the differences from the second embodiment with reference to FIGS. 1 to 7 and 8 of the above. Unless otherwise specified, the same reference numerals indicate the same configurations, and detailed description thereof will be omitted as appropriate.

As shown in FIG. 8, the back case 40 according to the third embodiment has a back side wall 42 extending from the peripheral edge of the back wall 41 in a direction perpendicular to the back wall 41. The back side wall 42 faces the first joint surface 32b of the front side wall 32 and has a second joint surface 42a to which the first joint surface 32b is joined. Further, as shown in FIG. 8, the second joint surface 42a is provided at a position facing the front guide 33.

In the second joint surface 42a, the region where the first joint surface 32b joins is configured as a joint portion 42b. Further, the second joint surface 42a is provided with a back guide 43 extending in a direction perpendicular to the back wall 41. The back guide 43 is provided at a position separated from the front side wall 32.

According to the third embodiment described above, in addition to the effects (1) to (4) described in the first embodiment and the second embodiment, the following effects can be obtained.
(5) In the third embodiment, since the distance between the back surface 21b of the substrate and the inner surface 41a of the back wall is larger than that of the first embodiment and the second embodiment, electronic components such as connectors are attached to the back surface 21b of the substrate. When arranged, such electronic components can be easily accommodated inside the accommodating case 70. Therefore, even when the electronic components are arranged on the back surface 21b of the substrate, it is not necessary to separately provide a waterproof mechanism, so that the cost can be reduced.

(Other embodiments)
-As shown in FIG. 9, the table guide 33 may have a second table guide surface 33b and a third table guide surface 33c. According to this modification, since the front guide 33 does not intervene between the back guide 43 and the front side wall 32, the space into which the molten member flows can be made larger than that of the first embodiment.

-In the above modification, the table guide 33 may be formed in a rectangular shape having no third table guide surface 33c.

As shown in FIG. 10, the table guide 33 may be configured to be connected only to the translucent inner surface 31a. That is, the front guide 33 may be provided apart from the front side wall 32. Further, as shown in FIG. 10, the table guide 33 may have the first table guide surface 33a and the third table guide surface 33c.

As shown in FIG. 11, the back guide 43 may be configured to have the groove 44, and the front guide 33 may be inserted into the groove 44.

In the second embodiment, the table guide 33 is attached to two sides 31Lc and 31Ld adjacent to each other among the four sides 31La, 31Lb, 31Lc and 31Ld constituting the translucent inner surface 31a. However, the present invention is not limited to this, and the front guide 33 corresponds to all of the four sides 31La, side 31Lb, side 31Lc, and side 31Ld constituting the translucent inner surface 31a. May be provided. According to this modification, when the front case 30 and the back case 40 are joined by laser welding, it is possible to prevent the back wall 41 from being joined in an inclined state with respect to the translucent wall 31.

-In the above-described first and third embodiments and each of the above-described modifications, the table guide 33 may be provided along all four sides constituting the translucent inner surface 31a. Alternatively, the front guide 33 may be provided along three of the four sides constituting the translucent inner surface 31a. In this case, it is preferable that the back case 40 is provided with the back guide 43 so as to correspond to all the front guides 33 provided in the front case 30.

10 Display unit, 11 Image display surface, 210 Support frame, 21 Circuit board, 21a mounting surface, 21b Substrate back surface, 21c Board side surface, 22 Accommodating part, 23 Light emitting element, 30 Front case, 31 Translucent wall, 31a Transmissive inner surface , 31b Translucent outer surface, 32 front side wall, 32a front side wall inner surface, 32b first joint surface, 32c corner, 32d front side wall outer surface, 33 front guide, 33a first front guide surface, 33b second front guide surface, 33c first 3 Front guide surface, 37 Condensing lens, 40 Back case, 41 Back wall, 41a 2nd joint surface, 41b Joint, 42 Back side wall, 42a 2nd joint surface, 43 Back guide, 43a 1st back guide surface, 43b 2nd back guide surface, 44 grooves, 70 storage case, 100 display device, 210 support frame.

Claims (5)

A back case that has a flat back wall and is composed of light-absorbing members,
It has a translucent wall that is arranged to face the back wall and extends parallel to the back wall, and a front side wall that extends from the translucent wall toward the back case in a direction perpendicular to the transmissive wall. A front case made of permeable members and
A circuit board having a mounting surface on which a light emitting element is mounted and housed inside the front case so that the mounting surface faces the translucent wall is provided.
The circuit board has a back surface of the board located on the opposite side of the mounting surface and the back surface of the circuit board in the thickness direction of the circuit board, and a side surface of the board connecting the mounting surface and the back surface of the board.
The front side wall is formed by forming an inner surface of the front side wall facing the side surface of the substrate, a first joining surface facing the back case and being joined to the back case by laser welding, and the inner surface of the front side wall and the first joining surface. Has corners to connect,
The translucent wall has a translucent inner surface facing the mounting surface.
A plurality of table guides are provided on the translucent inner surface along two sides adjacent to each other among the sides constituting the translucent inner surface.
The front guide has a front guide surface that extends perpendicular to the translucent inner surface.
The back case has a second joint surface that faces the front guide and extends parallel to the translucent inner surface.
The first joint surface is joined to the second joint surface, and back guides are provided at positions corresponding to the plurality of front guides.
The back guide has a back guide surface that extends in a direction perpendicular to the second joint surface and abuts on each of the plurality of front guide surfaces.
The front guide and the back guide are both display units provided apart from the corners. The display unit according to claim 1, wherein the circuit board is provided with an accommodating portion for accommodating the table guide corresponding to a position where the table guide is provided. The display unit according to claim 1 or 2, wherein the front guide has a stopper surface extending parallel to the translucent inner surface, and the back guide abuts on the stopper surface. The back case has a back side wall extending from the back wall toward the front case in a direction perpendicular to the back wall.
The display unit according to any one of claims 1 to 3, wherein the back side wall has a second joint surface that faces the front guide and extends in parallel with the translucent inner surface. A display device including a plurality of display units according to any one of claims 1 to 4.

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