JP7233354B2 - Display unit manufacturing method and display device manufacturing method - Google Patents

Description

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

A 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 light emitted from each light-emitting element.

The circuit board is housed in the housing case. The storage case has a box-shaped front case with one side open and a back case covering the opening of the front case. The back case is made of a light absorbing member and has a flat back wall. The front case is composed of a light-transmitting member, and includes a flat plate-shaped light-transmitting wall facing the back wall and extending parallel to the back wall, and a direction perpendicular to the light-transmitting wall from the peripheral edge of the light-transmitting wall toward the back case. It has a front side wall that protrudes into the

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

Patent Literature 1 discloses a configuration related to a case in which a positioning portion extending perpendicularly to the second joint surface is provided on the peripheral edge portion 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 Patent Application Laid-Open No. 2008-87811 (paragraph [0023], see 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. By pressing the first joint surface against the second joint surface while the second joint surface is partially melted, the first joint surface and the second joint surface are brought into close contact with each other.

However, in the configuration described in Patent Document 1, if the first joint surface and the second joint surface are joined by laser welding, the corners of the front side wall are covered with the positioning portion, and the first joint surface is pressed against the second joint surface, the melted member is pushed out to the outer surface of the front wall, adheres to the outer surface of the front 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.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. It is an object of the present invention to obtain a display unit manufacturing method capable of reducing the amount of outflow of a member melted by a laser beam to the outside of a housing case when joining by laser welding. Another object of the present invention is to provide a method of manufacturing a display device including the display unit.

A method of manufacturing a display unit according to the present invention comprises: a back case having a flat back wall and made of a light absorbing member; a translucent wall disposed facing the back wall and extending parallel to the back wall; and a front side wall extending in a direction perpendicular to the light-transmitting wall from the light-transmitting wall toward the back case, and having a front case composed of a light-transmitting member and a mounting surface on which the light-emitting element is mounted, and mounting a circuit board that is housed inside the front case so that the surface faces the light-transmitting wall, wherein the circuit board includes a back surface of the substrate located on the opposite side of the mounting surface in the thickness direction of the circuit board, and a mounting surface. The front side wall has an inner surface facing the side surface of the substrate, a first bonding surface facing the back case, and a corner connecting the inner surface of the front side wall and the first bonding surface. The light-transmitting wall has a light-transmitting inner surface facing the mounting surface, and a plurality of front guides are provided on the light-transmitting inner surface along two adjacent sides of the sides forming the light-transmitting inner surface. , the front guide has a front guide surface extending perpendicular to the light-transmitting inner surface, the back case has a second joint surface facing the front guide and extending parallel to the light-transmitting inner surface, and the second joint surface has , a back guide is provided at a position corresponding to each of the plurality of front guides, the back guide has a back guide surface extending in a direction perpendicular to the second joint surface and abutting on each of the plurality of front guide surfaces, A display unit manufacturing method for manufacturing a display unit in which both the guide and the back guide are spaced apart from the corner, the display unit manufacturing method comprising a second joint surface and a first joint in contact with the second joint surface. The position of the first joint surface on the second joint surface is determined by bringing the front guide surface into contact with the back guide surface before the laser welding step of joining the surfaces by laser welding. In the positioning step, when the position of the first joint surface on the second joint surface is determined, the space between the front guide and the back guide and the corner portion allows the member to be melted by laser welding to flow. is formed .

In the display unit manufacturing method of the present invention, the display unit has a front guide and a rear guide as positioning portions for determining the arrangement position of the first joint surface on the second joint surface, and the rear guide extends perpendicular to the second joint surface. The front guide surface abuts against the surface. Since the front guides are provided along two adjacent sides of the translucent inner surface extending parallel to the second joint surface, each front guide surface abuts on the back guide surface, thereby The arrangement position of the first joint surface in two different directions can be determined. In addition, since both the front guide and the back guide are spaced apart from the corners of the front side wall, at least a part of the melted member flows into the storage case through the corners of the front side wall. do. Therefore, it is possible to reduce the flow rate of the melted member to the outside of the storage case compared to the conventional case.

1 is a perspective view of a display device according to Embodiment 1 of the present invention; FIG. 1 is a front view of a display unit according to Embodiment 1 of the present invention; FIG. FIG. 3 is a cross-sectional view along the line AA of FIG. 2; The perspective view which looked at the front case concerning this Embodiment 1 from the back side. FIG. 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. 5A is a front view of the circuit board according to the first embodiment, and 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. FIG. 4 is a cross-sectional view corresponding to FIG. 3 of the display unit according to the second embodiment of the present invention; FIG. 7(a) is a partially enlarged cross-sectional view of area B in FIG. FIG. 7 is a partially enlarged cross-sectional view of region B in FIG. 6 of the display unit according to the second embodiment; FIG. 3 is a cross-sectional view corresponding to FIG. 3 of a display unit according to a third embodiment of the present invention; FIG. 4 is a cross-sectional view corresponding to FIG. 3 of a display unit according to another embodiment; FIG. 4 is a cross-sectional view corresponding to FIG. 3 of a display unit according to another embodiment; FIG. 4 is a cross-sectional view corresponding to FIG. 3 of a 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 denoted by the same reference numerals, and redundant description thereof will be appropriately simplified or omitted. Also, for convenience of explanation, the proportional relationship of sizes, shapes, etc. of portions shown in each drawing may be exaggerated.

(Embodiment 1)
A display unit 10 and a display device 100 according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 5. FIG.
FIG. 1 is a perspective view of a display device 100 according to Embodiment 1 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 an expressway or a general road to display alert 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 screws or the like in a state in which the image display surface 11 on which the image of each display unit 10 is displayed faces 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 housing case 70 that houses the circuit board 21. As shown in FIGS. The storage case 70 has a box-shaped front case 30 with one side open and a back case 40 covering the opening of the front case 30 .

The front case 30 is made from a member having light transmission properties. For example, it is manufactured by injection molding transparent resin such as polycarbonate resin or acrylic resin. In addition, the front case 30 includes a flat transparent wall 31 that constitutes the image display surface 11, and a front surface that protrudes in a direction perpendicular to the transparent wall 31 from the periphery of the transparent wall 31 toward the back case 40. It has side walls 32 .

In addition, since the front case 30 may be made of a translucent member, the members forming the front case 30 are not limited to resin. For example, glass, ceramic, or the like can be used as appropriate. 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.

A circuit board 21 is housed inside the front case 30 . The circuit board 21 is made of 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 rear surface 21b located on the opposite side of the mounting surface 21a and the circuit substrate 21 in the thickness direction, and a substrate side surface 21c connecting the mounting surface 21a and the substrate rear surface 21b. The mounting surface 21 a faces the translucent wall 31 and extends parallel to the translucent wall 31 .

The light emitting element 23 is composed of an LED element. The LED element that constitutes the light emitting element 23 may be a 3-in-1 surface-mounted LED element or a 1-in-1 surface-mounted LED element. Alternatively, a COB type LED element may be used in which a chip is directly mounted on the mounting surface 21a. The light emitting element 23 emits light of any color and any intensity toward the translucent wall 31 .

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

A plurality of condensing lenses 37 are provided on the translucent outer surface 31b. Each condensing 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 includes a front side wall inner surface 32a facing the substrate side surface 21c, a front side wall outer surface 32d located on the opposite side of the front side wall inner surface 32a and the front side wall 32 in the thickness direction, and a front side wall outer surface 32d facing the back case 40 and facing the back case 40. It has a first joint surface 32b to be joined and a corner portion 32c connecting the front wall inner surface 32a 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 translucent inner surface 31a and the front wall inner surface 32a, and has a first front guide surface 33a. The first front guide surface 33a is provided at a position spaced apart from the front wall inner surface 32a and configured to extend perpendicularly to the translucent inner surface 31a.

Assuming that the direction perpendicular to the translucent wall 31 is the thickness direction D1 of the display unit 10, the front guide 33 has a dimension L1 in the thickness direction D1 of the front guide 33 that 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 front guide 33 is connected to the translucent inner surface 31a. Therefore, the front guide 33 is provided apart from the corner 32c.

Further, as shown in FIG. 5( a ), a plurality of front guides 33 are provided inside the front case 30 . Each front guide 33 is provided along two adjacent sides 31Lc and 31Ld among the four sides 31La, 31Lb, 31Lc and 31Ld forming the translucent inner surface 31a.

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

In the display unit 10, it is preferable that the area of the circuit board 21 occupying the image display surface 11 is large when the display unit 10 is viewed from the front. When the circuit board 21 does not have the accommodating portion 22, the circuit board 22 cannot be brought into contact with the inner surface 32a of the front side wall by providing the front guide 33. However, according to the first embodiment, Since the front guide 33 is provided so as to pass through the housing portion 22, at least a portion 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 that occupies the image display surface 11 can be made larger than 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, for example, coloring a resin such as a polycarbonate resin or an acrylic resin and performing 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 a high light absorption property 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 addition, in Embodiment 1, the back case 40 is a plate-like member configured by 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. Since the front guide 33 is provided inside the front case 30 as described above, the second joint surface 41 a also faces the front guide 33 .

A rear guide 43 is provided on the second joint surface 41 a at a position spaced apart from the front side wall 32 . That is, the rear guide 43 is provided at a position spaced apart from the corner portion 32c forming the front side wall 32. As shown in FIG. Also, the first joint surface 32b of the front side wall 32 is joined to the second joint surface 41a. A region of the second joint surface 41a to which the first joint surface 32b is joined 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 perpendicular 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, like the first back guide surface 43a.

Next, a procedure for joining the front case 30 and the back case 40 will be described with reference to FIG. 5(d). In joining the front case 30 and the back case 40, first, as shown in FIG. Deploy. At this time, the first joint surface 32b of the front side wall 32 is arranged so as to contact the second joint surface 41a of the rear wall 41 .

Next, the front case 30 is moved along the second joint surface 41a, and the first rear guide surface 43a of the rear guide 43 and the first front guide surface 33a of the front guide 33 provided along the side 31Ld are brought into contact. contact. 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. Thereby, the arrangement position of the front case 30 in two different directions on the second joint surface 41a is determined.

Next, a laser beam is irradiated from the front case 30 side toward the joint portion 41b. The laser beam passes through the front side wall 32 and enters the joint portion 41b to heat the joint portion 41b. Thereby, the joint portion 41b is melted.
After the first joint surface 32b is pressed against the molten joint 41b, the joint 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 rear guide 43 are provided at positions separated from the corner 32c, the first joint surface 32b is pressed against the joint 41b melted by the irradiation of the laser beam. At this time, at least part of the melted resin flows into the storage case 70 through the corner 32c. Therefore, it is possible to reduce the amount of melted resin flowing out of the housing case 70 compared to the conventional case.

(2) In Embodiment 1, the display unit 10 has the front guide 33 and the back guide 43 as positioning portions that determine the arrangement position of the first joint surface 32b on the second joint surface 41a. The front guide surface 33a contacts the rear 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, each front guide surface 33a abuts on the back guide surfaces 43a and 43b. The arrangement position of the first joint surface 41a in two mutually 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 with a focus on differences from the first embodiment with reference to FIGS. 1 to 5 as well as FIGS. 6 and 7 . In addition, unless otherwise specified, the same reference numerals denote the same configuration, and detailed description thereof will be omitted as appropriate.

As shown in FIG. 6, the front guide 33 according to the second embodiment includes a first front guide surface 33a, a second front guide surface 33b facing the first front guide surface 33a, and a first front guide surface 33a. It has a third front guide surface 33c (“stopper surface” in the claims) that connects the second front guide surfaces 33b. The second front guide surface 33b is configured to extend parallel to the first front guide surface 33a. The third front guide surface 33c is configured to extend parallel to the translucent inner surface 31a.

In addition, as described in the first embodiment, the front guide 33 has four sides 31La, 31Lb, 31Lc, and 31Ld that constitute the translucent inner surface 31a. It is provided along side 31Lc and 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 while being sandwiched between the first front guide surface 33a and the second front guide surface 33b.

According to the second embodiment described above, 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 not attached to the first guide surface 33b during the joining operation by laser welding. It is possible to suppress displacement 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. Arrange the back case 40 . Thereafter, the joint portion 41b is melted by irradiating it with a laser beam, and the first joint surface 32b is pressed against the melted joint portion 41b. At this time, since the joint portion 41b is in a melted state, the translucent wall 31 and the rear wall 41 move in the direction of approaching each other, and as shown in FIG. abut on. In this way, the rear guide 43 abuts against the third front guide surface 33c, so that the relative arrangement positions of the front case 30 and the rear case 40 in the thickness direction D1 of the display unit 10 are determined. Therefore, it is possible to suppress variations in the relative arrangement positions of the front case 30 and the back case 40 in the thickness direction D1 of the display unit 10 for each display unit 10 .

(Embodiment 3)
The display unit 10 and the display device 100 of the fourth embodiment will be described with reference to FIG. 8 in addition to FIGS. 1 to 7, focusing on differences from the second embodiment. In addition, unless otherwise specified, the same reference numerals denote the same configuration, 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 wall 42 extending from the periphery of the back wall 41 in a direction perpendicular to the back wall 41 . The back side wall 42 has a second joint surface 42a that faces the first joint surface 32b of the front side wall 32 and is joined with the first joint surface 32b. Further, as shown in FIG. 8, the second joint surface 42a is provided at a position facing the front guide 33. As shown in FIG.

A region of the second joint surface 42a to which the first joint surface 32b is joined is configured as a joint portion 42b. A rear guide 43 extending in a direction perpendicular to the rear wall 41 is provided on the second joint surface 42a. The back guide 43 is provided at a position spaced apart 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 and second embodiments, the following effects can be obtained.
(5) In the third embodiment, the distance between the substrate back surface 21b and the back wall inner surface 41a is greater than in the first and second embodiments, so that electronic components such as connectors can be mounted on the substrate back surface 21b. When arranging, it becomes easy to accommodate such electronic components inside the accommodation case 70 . Therefore, even when electronic components are arranged on the back surface 21b of the substrate, the need for providing a separate waterproof mechanism is reduced, and costs can be reduced.

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

- In the above modified example, the front guide 33 may be configured in a rectangular shape without the third front guide surface 33c.

- As shown in FIG. 10, the front 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 front guide 33 may have a first front guide surface 33a and a third front guide surface 33c.

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

In the above-described second embodiment, the front guide 33 is arranged on the two sides 31Lc and 31Ld adjacent to each other among the four sides 31La, 31Lb, 31Lc and 31Ld that constitute 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, 31Lb, 31Lc and 31Ld forming the translucent inner surface 31a. may be provided. According to this modified example, when joining the front case 30 and the back case 40 by laser welding, it is possible to prevent the back wall 41 from being joined in a state in which the back wall 41 is inclined with respect to the translucent wall 31 .

- In the first and third embodiments and each modification described above, the front guide 33 may be provided along all four sides forming the translucent inner surface 31a. Alternatively, the front guide 33 may be provided along three of the four sides forming the translucent inner surface 31a. In this case, the back case 40 is preferably provided with back guides 43 corresponding to all the front guides 33 provided on the front case 30 .

REFERENCE SIGNS LIST 10 display unit 11 image display surface 210 support frame 21 circuit board 21a mounting surface 21b substrate rear surface 21c substrate side surface 22 accommodating portion 23 light emitting element 30 front case 31 translucent wall 31a translucent inner surface , 31b translucent outer surface, 32 front side wall, 32a front side wall inner surface, 32b first joint surface, 32c corner portion, 32d front side wall outer surface, 33 front guide, 33a first front guide surface, 33b second front guide surface, 33c second 3 front guide surface 37 condenser lens 40 rear case 41 rear wall 41a second joint surface 41b joint portion 42 rear wall 42a second joint surface 43 rear guide 43a first rear guide surface 43b Second back guide surface 44 groove portion 70 storage case 100 display device 210 support frame.

Claims (5)

a back case having a flat back wall and made of a light-absorbing member;
and a front side wall extending from the light-transmitting wall toward the back case in a direction perpendicular to the light-transmitting wall. a front case composed of a permeable member;
a circuit board having a mounting surface on which a light-emitting element is mounted, and which is housed inside the front case so that the mounting surface faces the translucent wall;
The circuit board has a substrate rear surface located opposite to the mounting surface in a thickness direction of the circuit board, and a substrate side surface connecting the mounting surface and the substrate rear surface,
the front wall has an inner surface facing the side surface of the substrate, a first joint surface facing the back case, and a corner connecting the inner surface of the front wall and the first joint surface,
The light-transmitting wall has a light-transmitting inner surface facing the mounting surface,
A plurality of front guides are provided on the light-transmitting inner surface along two adjacent sides of the sides constituting the light-transmitting inner surface,
The front guide has a front guide surface extending perpendicular to the translucent inner surface,
the back case has a second joint surface facing the front guide and extending parallel to the translucent inner surface;
Back guides are provided on the second joint surface at positions respectively corresponding to the plurality of front guides,
the back guide has a back guide surface extending in a direction perpendicular to the second joint surface and abutting on each of the plurality of front guide surfaces;
A display unit manufacturing method for manufacturing a display unit, wherein the front guide and the back guide are both provided away from the corner,
a laser welding step of joining the second joint surface and the first joint surface in contact with the second joint surface by laser welding;
A positioning step of determining the position of the first joint surface on the second joint surface by bringing the front guide surface into contact with the back guide surface before the laser welding step, wherein the second joint When the position of the first joint surface on the surface is determined, a gap is formed between the front guide, the back guide, and the corner, into which the member to be melted by the laser welding can flow. a positioning process that
A display unit manufacturing method, comprising: 2. The display unit manufacturing method according to claim 1, wherein the circuit board is provided with an accommodating portion for accommodating the front guide corresponding to a position where the front guide is provided. 3. The display unit manufacturing method according to claim 1, 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 wall extending from the back wall toward the front case in a direction perpendicular to the back wall;
The display unit manufacturing method according to any one of claims 1 to 3, wherein the back side wall has a second joint surface facing the front guide and extending parallel to the translucent inner surface. A display device manufacturing method , comprising arranging a plurality of the display units obtained by the display unit manufacturing method according to any one of claims 1 to 4 to construct a display device.

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