CN110646960A

CN110646960A - Pressure bonding device and method for manufacturing display device

Info

Publication number: CN110646960A
Application number: CN201910555132.3A
Authority: CN
Inventors: 加藤隆幸; 田中慎一郎; 石川诚
Original assignee: Japan Display Central Inc
Current assignee: Japan Display Central Inc
Priority date: 2018-06-26
Filing date: 2019-06-25
Publication date: 2020-01-03
Anticipated expiration: 2039-06-25
Also published as: CN110646960B; JP2020001223A; JP7425156B2; JP7166807B2; JP2023015124A

Abstract

The invention provides a pressure welding device which can restrain the difference of local extension generated by a 2 nd workpiece even a plurality of plate-shaped 2 nd workpieces smaller than a 1 st workpiece are adhered to the 1 st workpiece with a curved surface part, and at least one of a manufacturing method of a display device which restrains the display quality reduction of a display panel. The pressure bonding device is used for bonding a plate-shaped 2 nd workpiece smaller than a plate-shaped 1 st workpiece with a curved surface part to the plate-shaped 1 st workpiece. The pressure bonding device includes a vacuum chamber, a stage disposed in the vacuum chamber and on which a 1 st workpiece is placed, and an elastic body having elasticity more than that of the stage. The press-bonding device brings the distance between the elastic body and the stage closer to each other, thereby press-bonding the 2 nd workpiece to the 1 st workpiece.

Description

Pressure bonding device and method for manufacturing display device

Technical Field

The invention relates to a pressure bonding device and a method for manufacturing a display device.

Background

Display devices having curved surfaces are known. For example, patent document 1 discloses a technique of using a cover glass as a front panel having a curved surface.

The bonding method of bonding the display panel to the cover glass is roughly classified into a roller type shown in patent document 2 and a diaphragm type shown in patent document 3.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2015-92422

Patent document 2; japanese patent laid-open publication No. 2016-179600

Patent document 3: japanese laid-open patent publication No. 2015-79587

In the roller technique disclosed in patent document 2, when a plurality of display panels are bonded to one front panel, the rollers are pressed against the surface curved from the end portions of the display panels, and a difference in the amount of local elongation occurs in the display panels, which may reduce the display quality of the display panels.

In the diaphragm type technique disclosed in patent document 3, when a plurality of display panels are attached to each other using a diaphragm, a display panel disposed at the center of a convex portion or a concave portion of a front panel is not pressed against a surface curved from an end portion of the display panel. However, the display panel disposed at a position facing the end side of the convex portion or the concave portion of the front panel may be pressed against a surface curved from the end portion of the display panel, and a difference in local elongation may occur in the display panel, thereby degrading the display quality of the display panel.

Disclosure of Invention

The present invention aims to provide a pressure bonding device capable of suppressing a difference in local elongation occurring in a 2 nd work even when a plurality of plate-like 2 nd works smaller than a 1 st work are bonded to the 1 st work having a curved surface portion, and a method of manufacturing a display device suppressing a reduction in display quality of a display panel.

A pressure bonding apparatus according to an aspect of the present invention is a pressure bonding apparatus for bonding a plurality of plate-like 2 nd workpieces smaller than a plate-like 1 st workpiece having a curved surface portion to the plate-like 1 st workpiece, the pressure bonding apparatus including: a vacuum chamber; a stage arranged in the vacuum chamber and on which the 1 st workpiece is placed; and an elastic body having elasticity more than the stage, and the 2 nd workpiece is pressed against the 1 st workpiece by bringing the distance between the elastic body and the stage closer to each other.

A method of manufacturing a display device according to an aspect of the present invention is a method of manufacturing a display device in which a plurality of display panels smaller than a front panel having a curved surface portion and being light-transmissive are bonded to the front panel, the method including: a preparation step of attaching the front panel to a stage opposed to an elastic body having elasticity, and attaching the display panel to a carrier sheet inserted between the elastic body and the front panel; and a pressure bonding step of, after the preparation step, clamping the carrier sheet and the display panel by the elastic body and the stage to pressure bond the display panel to the front panel.

Another method of manufacturing a display device includes bonding a plurality of display panels smaller than a front panel having a curved surface portion and being light-transmissive to the front panel, the method including: a preparation step of attaching the display panel to an elastic body having elasticity, and attaching the front panel to a stage that faces the elastic body; and a pressure bonding step of, after the preparation step, clamping the display panel between the elastic body and the stage to pressure bond the display panel to the front panel

Drawings

Fig. 1 is a schematic cross-sectional view of a display device of embodiment 1.

Fig. 2 is a schematic plan view of the display device of embodiment 1.

Fig. 3 is a structural diagram of a pressure bonding apparatus according to embodiment 1.

Fig. 4 is a plan view illustrating holding of the carrier sheet in the pressure bonding apparatus according to embodiment 1.

Fig. 5 is a configuration diagram for explaining an operation of the pressure bonding apparatus according to embodiment 1.

Fig. 6 is a configuration diagram for explaining an operation of the pressure bonding device according to embodiment 1.

Fig. 7 is a configuration diagram for explaining an operation of the pressure bonding device according to embodiment 1.

Fig. 8 is an explanatory view for explaining a diaphragm of the crimping apparatus of the comparative example.

Fig. 9 is a configuration diagram for explaining an operation of the pressure bonding apparatus according to modification 1 of embodiment 1.

Fig. 10 is a configuration diagram for explaining an operation of the pressure bonding apparatus according to modification 1 of embodiment 1.

Fig. 11 is a configuration diagram for explaining an operation of the pressure bonding apparatus according to modification 1 of embodiment 1.

Fig. 12 is a schematic cross-sectional view of a display device of embodiment 2.

Fig. 13 is a schematic plan view of a display device of embodiment 2.

Fig. 14 is a structural diagram of a pressure bonding apparatus according to embodiment 2.

Fig. 15 is a configuration diagram for explaining an operation of the pressure bonding apparatus according to embodiment 2.

Fig. 16 is a configuration diagram for explaining an operation of the pressure bonding device according to embodiment 2.

Fig. 17 is a configuration diagram for explaining an operation of the pressure bonding apparatus according to embodiment 2.

Fig. 18 is a structural diagram of a pressure bonding apparatus according to embodiment 3.

Fig. 19 is a configuration diagram for explaining an operation of the pressure bonding device according to embodiment 3.

Fig. 20 is a structural diagram of a pressure bonding apparatus according to embodiment 4.

Fig. 21 is a configuration diagram for explaining an operation of the pressure bonding apparatus according to embodiment 4.

Fig. 22 is a structural diagram of a pressure bonding apparatus according to embodiment 5.

Fig. 23 is a configuration diagram for explaining an operation of the pressure bonding apparatus according to embodiment 5.

Fig. 24 is a configuration diagram for explaining an operation of the pressure bonding apparatus according to embodiment 5.

Fig. 25 is a configuration diagram for explaining an operation of the pressure bonding apparatus according to embodiment 5.

Wherein the reference numerals are as follows:

1 front panel

1F No. 1

1R 2 nd face

2 display panel

3 display device

4 bearing sheet

5 vacuum chamber

6 sealing member

7 diaphragm

8 attaching unit

9 mask

10 carrying platform

20. 21, 22, 23, 24, 25, 26, 27, 28, 29 elastomer

30 control device

65. 66 lifting device

100 crimping device

Detailed Description

The embodiments (embodiments) for carrying out the present invention will be described in detail with reference to the accompanying drawings. The present invention is not limited to the contents described in the following embodiments. The following constituent elements include substantially the same elements as those easily conceived by those skilled in the art. The following constituent elements can be appropriately combined. The disclosure is merely an example, and appropriate modifications that are obvious to those skilled in the art and that are within the spirit of the invention are naturally included in the scope of the invention. In addition, although the drawings schematically show the width, thickness, shape, and the like of each part as compared with the actual embodiment in order to make the description more clear, the drawings are merely examples and do not limit the explanation of the present invention. In the present specification and the drawings, the same reference numerals are given to the same elements as those described in the conventional drawings, and detailed description thereof may be omitted as appropriate.

(embodiment mode 1)

Fig. 1 is a schematic cross-sectional view of a display device of embodiment 1. Fig. 2 is a schematic plan view of the display device of embodiment 1. FIG. 1 is a section I-I' of FIG. 2. As shown in fig. 1, the display device 3 of embodiment 1 includes a front panel 1 and three display panels 2. The front panel 1 is bonded with three display panels 2 at intervals Δ L shown in fig. 2. The display panel 2 is smaller than the front panel 1 in a plan view.

The front panel 1 is a cover member that protects the display panel 2. The display panel 2 is disposed on one side of the front panel 1, and is attached to the front panel 1 via an adhesive layer not shown. The front panel 1 is rectangular when viewed from the front as shown in fig. 2, but it is not limited to the shape.

As shown in fig. 1, the front panel 1 is integrally curved with a curvature R1. The front panel 1 is made of light-transmitting glass or synthetic resin. Therefore, light from the display panel 2 is transmitted through the front panel 1. Then, the viewer sees an image displayed on the display surface along the surface of the front panel 1.

The display panel 2 is, for example, a liquid crystal panel or an organic light emitting diode panel (hereinafter referred to as an OLED panel). The liquid crystal panel or the OLED panel may also include a touch panel. When the display panel 2 is a liquid crystal panel, a backlight is provided on the back side of the display panel 2. The display panel 2 includes a 1 st substrate and a 2 nd substrate formed of glass or the like, and a liquid crystal layer interposed between the 1 st substrate and the 2 nd substrate.

For example, the display panel 2 is rectangular when viewed from the front. The display panel 2 is curved, and both ends of the display panel 2 in one direction are located on the front side of the center of the one direction in the viewer's view.

As shown in fig. 1, the curvature of the curved surface portion of the front panel 1 is fixed in the entire surface. The front surface of the display panel 2 is attached to the 2 nd surface 1R of the front panel 1.

In order to manufacture the display device 3 described above, the pressure bonding device 100 is prepared in embodiment 1. Fig. 3 is a structural diagram of a pressure bonding apparatus according to embodiment 1. Fig. 4 is an explanatory diagram for explaining holding of the carrier sheet in the pressure bonding apparatus according to embodiment 1. Fig. 5 is a configuration diagram for explaining an operation of the pressure bonding apparatus according to embodiment 1. The pressure bonding apparatus 100 includes a vacuum chamber 5, a vacuum source 51, a stage 10, an elastic body 20, a fixing table 62, setting tables 61 and 63, a lifting device 65, a pipe 52, and a control device 30.

The vacuum chamber 5 is a container that houses the stage 10, the fixed table 62, the setting tables 61 and 63, and the elevating device 65. The vacuum source 51 is a pump, and exhausts air in the vacuum chamber 5 through a pipe 52 to make the pressure in the vacuum chamber 5 lower than the atmospheric air.

The stage 10 is a jig for fixing the front panel 1 in close contact with a fixing portion 11 along the surface of the curved portion, and is disposed in the vacuum chamber 5. The setting table 61 is provided for the stage 10. The distance between the fixing table 62 and the installation table 61 can be appropriately changed by the elevating device 65. The lifting device 65 lifts and lowers the installation table 61 relative to the fixed table 62 by driving of a driving mechanism such as a hydraulic pressure or a motor based on a control command of the control device 30.

The elastic body 20 is a base having elasticity. The elastic body 20 is formed of a sheet-like synthetic rubber or an elastic body having a uniform film thickness when no pressure is applied. The elastic member may be natural rubber. The elastic body 20 is fixed to a surface of the installation table 63 on the installation table 61 side. As shown in fig. 3, the elastic body 20 has a concave pressure receiving surface 20F along the fixing surface 11F of the fixing portion 11.

The carrier sheet 4 is an elastic member. The elastic member is formed of a sheet-like synthetic rubber or elastomer having a uniform film thickness when no pressure is applied. The elastic member may be natural rubber.

As shown in fig. 4, the carrier sheet 4 has both ends supported by the support plate 40. Thus, the carrier sheet 4 covers a part of the front panel 1 in a plan view. The display panel 2 is previously adhered to the carrier sheet 4 by an adhesive layer or the like. The carrier sheet 4 is positioned at a predetermined position where the display panel 2 and the front panel 1 overlap each other in a plan view.

As shown in fig. 3, the carrier sheet 4 is sandwiched between the elastic body 20 and the stage 10 in a non-contact manner. A section line L1 of the mounting surface of the carrier sheet 4 on which the display panel 2 is mounted is along a section line L2 of the front panel 1 opposed at the minimum distance.

In this way, the mounting surface of the carrier sheet 4 on which the display panel 2 is mounted is inclined along a tangent line to the fixing surface 11F of the stage 10 opposed at a minimum distance.

The control device 30 is, for example, a computer including at least a CPU (Central Processing Unit) as an arithmetic device and a memory as a storage device. The control device 30 can also execute a computer program using these hardware resources to realize various functions.

Specifically, the control device 30 reads a computer program stored in a predetermined storage unit (not shown), expands the computer program in the memory, and causes the CPU to execute commands included in the program expanded in the memory. In embodiment 1, the control device 30 controls the operation of the vacuum source 51 to control the pressure in the vacuum chamber 5. The controller 30 controls the operation of the elevating device 65 to control the distance between the installation table 61 and the installation table 63. Thereby, the distance between the elastic body 20 and the stage 10 is changed by the driving of the elevating device 65.

Next, a method for manufacturing a display device using the pressure bonding apparatus 100 will be described. First, in the preparation step, as shown in fig. 3, the first display panel 2 is mounted on the carrier sheet 4 in the vacuum chamber 5 via an adhesive layer. At this time, an adhesive layer is also previously attached to the display panel 2 on the side opposite to the front panel 1. The adhesive strength of the adhesive layer on the carrier sheet 4 side is smaller than that of the adhesive layer on the side opposite to the front panel 1.

In the preparation step, the front panel 1 is fixed in close contact with the fixing portion 11, and the front panel 1 is attached to the stage 10 via an adhesive layer. In this way, the front panel 1 is mounted on the stage 10. The front panel 1 may be attached to the stage 10 before or after the first display panel 2 is attached to the carrier sheet 4, or simultaneously.

After the preparation step, a pressure reduction step of reducing the pressure in the vacuum chamber 5 is performed. The control device 30 controls the operation of the vacuum source 51 to control the pressure in the vacuum chamber 5.

After the pressure in the vacuum chamber 5 reaches a predetermined pressure, a pressure bonding step of bonding the display panel 2 to the front panel 1 is performed. As shown in fig. 5, the controller 30 sets the elevating device 65 to the raised state, and reduces the distance between the installation table 61 and the installation table 63.

As a result, the distance between the carrier sheet 4 and the fixing portion 11 of the stage 10 is reduced, and the first display panel 2 mounted on the carrier sheet 4 is brought into contact with the front panel 1. In the pressure bonding step, when the front panel 1 abuts against the first display panel 2, the first display panel 2 is sandwiched between the elastic body 20 and the front panel 1 together with the carrier sheet 4.

After the pressure bonding step, in the peeling step, as shown in fig. 6, the controller 30 lowers the lifting device 65 to increase the distance between the installation table 61 and the installation table 63. Thus, the carrier sheet 4 is peeled off from the first display panel 2 while the first display panel 2 is bonded to the front panel 1.

Next, as shown in fig. 6, the second display panel 2 is mounted on the carrier sheet 4 via an adhesive layer. The carrier sheet 4 is positioned at a predetermined position different from the position where the first display panel 2 is mounted and at which the second display panel 2 and the front panel 1 overlap in a plan view. Next, although not shown, in the pressure bonding step, as described above, the controller 30 sets the elevating device to the raised state, and reduces the distance between the installation table 61 and the installation table 63.

After the pressure bonding step, in the peeling step, as shown in fig. 7, the controller 30 lowers the lifting device to increase the distance between the installation table 61 and the installation table 63. Thus, the carrier sheet 4 is peeled off from the second display panel 2 while the second display panel 2 is bonded to the front panel 1.

Next, as shown in fig. 7, the third display panel 2 is mounted on the carrier sheet 4 via an adhesive layer. The carrier sheet 4 is positioned at a predetermined position different from the position where the first display panel 2 and the second display panel are mounted and at which the third display panel 2 and the front panel 1 overlap in a plan view. Next, although not shown, the pressure bonding step is performed as described above. Then, the process of the peeling process is performed.

Then, the pressure in the vacuum chamber 5 is returned to atmospheric pressure, and the display device 3 shown in fig. 1 and 2 is taken out.

Fig. 8 is an explanatory view for explaining a diaphragm of the crimping apparatus of the comparative example. As shown in fig. 8, when the display panels 2 are bonded using the separators 7 to which the plurality of display panels 2 are attached, the display panel 2 disposed at the center with respect to the convex portion or concave portion of the front panel 1 is not pressed against the surface curved from the end portion of the display panel 2. However, the display panels 2 arranged at positions facing the end sides of the convex portions or concave portions of the front panel 1 are pressed against the surface curved from the end portions of the display panels 2, and a gap G is generated on one side of each display panel 2. This causes a difference in the amount of local expansion in the display panel 2 disposed at a position facing the end side of the convex portion or the concave portion of the front panel 1, and thus the display quality of the display panel 2 may be degraded.

In contrast, as shown in fig. 5, 6, and 7, in embodiment 1, the plurality of display panels 2 (three display panels 2) are not pressed against the surface curved from the end portion of the display panel 2. The display panel 2 is attached to the front panel 1 from the center to both ends of the display panel 2. This causes a difference in local elongation between the display panel 2 and the center of the display panel 2 to cancel each other out. As a result, the display quality of the display panel 2 is suppressed from being degraded.

In embodiment 1, the manufactured display device 3 is mounted on, for example, an instrument panel of a vehicle. The display device 3 has an advantage that the curved interior of the vehicle is smoothly connected to the surface of the display device 3 by curving the surface of the front panel 1. The display panel 2 displays, for example, a navigator, a speedometer, a tachometer, a fuel gauge, a water thermometer, and the like.

The display device 3 is not necessarily mounted on a vehicle, and may be applied to other electronic devices such as a mobile terminal. Even when the display device 3 is mounted on a vehicle, the image displayed on the display device 3 is not limited to the instruments of the vehicle, and may be, for example, a map for car navigation.

The display panel 2 may be an organic EL panel. In the case where the display panel 2 is an organic EL panel, a backlight is not required. In addition, the display panel 2 may also have a touch detection function. That is, a touch panel may be provided inside the display panel 2 or on the surface of the display panel 2.

The front panel 1 is not necessarily formed of glass. The front panel 1 may be formed of, for example, a light-transmitting synthetic resin.

As described above, the pressure bonding apparatus 100 includes the elastic body 20, the stage 10, and the carrier sheet 4 inserted between the elastic body 20 and the stage 10. The stage 10 is fixed to overlap the 1 st surface 1F of the curved surface portion of the front panel 1, and has a shape along the 1 st surface 1F. The carrier sheet 4 holds the display panel 2 and brings the elastic body 20 and the stage 10 closer to each other, thereby pressure-bonding the display panel 2 as the 2 nd workpiece to the 2 nd surface 1R of the front panel 1 as the 1 st workpiece.

This suppresses the difference in the local elongation generated in the display panel 2. The pressure bonding apparatus 100 can simultaneously bond a plurality of plate-shaped display panels 2 as the 2 nd workpiece to the plate-shaped front panel 1 as the 1 st workpiece having a curved portion. This can shorten the manufacturing time of the display device 3 and reduce the cost of the display device 3.

In the pressure bonding apparatus 100 according to embodiment 1, the display panel 2 can be bonded at any position according to the size of the front panel 1 of a plurality of types depending on the position of the carrier sheet 4.

In addition, according to the above-described method for manufacturing the display device 3, the pressure for pressing the display panel 2 against the front panel 1 can be sufficiently applied. As a result, the state in which the display panel 2 and the front panel 1 are bonded to each other is stable, and the deterioration of the display quality can be suppressed. In addition, the display panel 2 is less likely to fall off from the front panel 1.

In addition, when the display panel 2 is a liquid crystal panel, since a difference in local elongation occurring in the display panel 2 can be suppressed, a misalignment between the array substrate and the counter substrate can be suppressed. As a result, the display quality can be suppressed from being degraded.

(modification 1 of embodiment 1)

Fig. 9 to 11 are configuration diagrams for explaining the operation of the pressure bonding apparatus according to modification 1 of embodiment 1. In the description of modification 1 of embodiment 1, the same components as those of embodiment 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

In pressure bonding device 100 according to modification 1 of embodiment 1, fixing surface 11F of stage 10 has a curved surface portion, as in the pressure bonding device according to embodiment 1. The stage 10 of modification 1 of embodiment 1 includes the fixing portion 11 described in embodiment 1.

Unlike the pressure bonding apparatus of embodiment 1, the pressure bonding apparatus 100 of modification 1 of embodiment 1 includes

elastic bodies

21, 22, and 23 different from those of the preparation steps. As shown in fig. 9, the elastic body 21 is mounted on the installation table 63. The elastic body 21 has a size facing a part of the fixing surface 11F of the stage 10. As shown in fig. 10, the elastic body 22 is attached to an installation table 63. The elastic body 22 has a size facing a part of the fixing surface 11F of the stage 10. As shown in fig. 11, the elastic body 23 is attached to an installation table 63. The elastic body 23 has a size facing a part of the fixing surface 11F of the stage 10.

As shown in fig. 9, the elastic body 21 has a concave pressure receiving surface 21F along the fixing surface 11F of the fixing portion 11. As shown in fig. 10, the elastic body 22 has a concave pressure receiving surface 22F along the fixing surface 11F of the fixing portion 11. As shown in fig. 11, the elastic body 23 has a concave pressure receiving surface 23F along the fixing surface 11F of the fixing portion 11.

Since

elastic bodies

21, 22, and 23 are smaller than elastic body 20 of embodiment 1, display panel 2 can be bonded to front panel 1 even if the pressure with which stage 10 is pressed against

elastic bodies

21, 22, and 23 is small.

According to this configuration, the same operational effects as those of embodiment 1 are obtained. As with the pressure bonding apparatus of embodiment 1, the pressure bonding apparatus 100 of modification 1 of embodiment 1 can bond the plurality of display panels 2 and the front panel 1 by repeatedly performing the preparation step, the pressure bonding step, and the peeling step.

(embodiment mode 2)

Fig. 12 is a schematic cross-sectional view of a display device of embodiment 2. Fig. 13 is a schematic plan view of a display device of embodiment 2. Fig. 12 is a cross-sectional view XII-XII' in fig. 13. In the description of embodiment 2, the same components as those in embodiment 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

As shown in fig. 12, the front panel 1 of embodiment 2 includes a curved surface portion 15 having a curvature R2, a curved surface portion 16 having a curvature R3 different from the curvature R2, and a coupling portion 17 connecting the curved surface portion 15 and the curved surface portion 16. That is, the curved surface portion 16 is curved so that the curved surface portion 15 is convex when viewed from the display panel 2 side and the curved surface portion 16 is concave when viewed from the viewer side, and the curved surface portion 15 is concave and the surface portion 16 is convex. In this way, the front panel 1 has a plurality of

curved surface portions

15, 16, and the curvatures of the

curved surface portions

15, 16 are different.

As shown in fig. 12 and 13, the display panel 2 is curved. From the viewer, both ends of the display panel 2 attached to the curved surface portion 15 in one direction are located on the front side than the center of the length. In addition, from the viewer, both ends of the display panel 2 attached to the curved surface portion 16 in one direction are located on the rear side than the center in the one direction.

Fig. 14 is a structural diagram of a pressure bonding apparatus according to embodiment 2. Fig. 15 to 17 are configuration diagrams for explaining the operation of the pressure bonding apparatus according to embodiment 2. As shown in fig. 14 to 17, the pressure bonding apparatus 100 includes a vacuum chamber 5, a vacuum source 51, a stage 10,

elastic bodies

24 and 25, fixing tables 62 and 64, setting tables 61 and 63, elevating

devices

65 and 66, a pipe 52, and a control device 30.

The stage 10 is a jig disposed in the vacuum chamber 5 and used to fix the front panel 1 in close contact with the fixing

portions

11 and 12 along the 1 st surface 1F of the

curved portions

15 and 16. The fixing portion 11 has a convex shape bulging toward the installation base 63, and the fixing portion 12 has a concave shape recessed toward the installation base 61.

As shown in fig. 14, the elastic body 24 has a concave pressure receiving surface 24F along the fixing surface 11F of the fixing portion 11. As shown in fig. 16, the elastic body 25 has a convex pressure receiving surface 25F along the fixing surface 12F of the fixing portion 12.

The setting table 61 sets the stage 10. The distance between the fixing table 62 and the installation table 61 can be appropriately changed by the elevating device 65. The

elastic bodies

24 and 25 are provided on the setting table 63. The distance between the fixing table 64 and the installation table 63 can be changed as appropriate by the elevating device 66. The lifting device 66 lifts and lowers the installation table 63 relative to the fixed table 64 by driving of a driving mechanism such as a hydraulic pressure or a motor based on a control command of the control device 30.

As shown in fig. 14, the carrier sheet 4 is sandwiched between the elastic body 24 and the stage 10 in a non-contact manner. A section line L3 of the mount surface of the carrier sheet 4 on which the display panel 2 is mounted is along a tangent line L4 of the front panel 1 opposed at a minimum distance.

As shown in fig. 16, the carrier sheet 4 is sandwiched between the elastic body 25 and the stage 10 in a non-contact manner. A section line L5 of the mount surface of the carrier sheet 4 on which the display panel 2 is mounted is along a tangent line L6 of the front panel 1 opposed at the maximum distance. The maximum normal distance of the display panel 2 from the front panel 1 on the normal line of the fixing surface 12F shown in fig. 16 is equal to the minimum normal distance of the display panel 2 from the front panel 1 on the normal line of the fixing surface 11F shown in fig. 14.

Next, a method for manufacturing a display device using the pressure bonding apparatus 100 will be described. First, in the preparation step, as shown in fig. 14, the first display panel 2 is mounted on the carrier sheet 4 in the vacuum chamber 5 via an adhesive layer. In this case, it is preferable to attach an adhesive layer also to the first display panel 2 on the side opposite to the front panel 1. The adhesive strength of the adhesive layer on the carrier sheet 4 side is smaller than that of the adhesive layer on the side opposite to the front panel 1.

Further, in the preparation step, the front panel 1 is fixed in close contact with the fixing

portions

11 and 12, and the front panel 1 is attached to the stage 10 via an adhesive layer. The front panel 1 may be attached to the stage 10 before or after the first display panel 2 is attached to the carrier sheet 4, or may be attached at the same time.

After the pressure in the vacuum chamber 5 reaches a predetermined pressure, a pressure bonding step of bonding the display panel 2 to the front panel 1 is performed. As shown in fig. 15, the controller 30 sets the elevating device 65 to the raised state, and reduces the distance between the installation table 61 and the installation table 63.

As a result, the distance between the carrier sheet 4 and the fixing portion 11 of the stage 10 is reduced, and the display panel 2 mounted on the carrier sheet 4 abuts against the front panel 1. In the pressure bonding step, when the front panel 1 abuts against the first display panel 2, the first display panel 2 is sandwiched between the elastic body 24 and the front panel 1 together with the carrier sheet 4.

After the pressure bonding step, in the peeling step, as shown in fig. 16, the controller 30 lowers the lifting device 65 to increase the distance between the installation table 61 and the installation table 63. Thereby, the carrier sheet 4 is peeled from the first display panel 2 while the first display panel 2 is bonded to the front panel 1.

Next, as shown in fig. 16, the second display panel 2 is mounted on the carrier sheet 4 via an adhesive layer. The carrier sheet 4 is positioned at a predetermined position different from the position where the first display panel 2 is mounted and at which the second display panel 2 and the front panel 1 overlap each other in a plan view.

Next, a pressure bonding step of bonding the display panel 2 to the front panel 1 is performed. As shown in fig. 17, the controller 30 lowers the elevator 66 to reduce the distance between the installation table 61 and the installation table 63.

As a result, the distance between the carrier sheet 4 and the fixing portion 12 of the stage 10 is reduced, and the display panel 2 mounted on the carrier sheet 4 abuts against the front panel 1. In the pressure bonding step, when the front panel 1 abuts against the second display panel 2, the second display panel 2 is sandwiched between the elastic body 25 and the front panel 1 together with the carrier sheet 4.

After the pressure bonding step, although not shown in the drawing, in the peeling step, the control device 30 raises the lifting device 66 to increase the distance between the installation table 61 and the installation table 63. Thereby, the second display panel 2 is kept in a state of being bonded to the front panel 1, and the carrier sheet 4 is peeled off from the second display panel 2.

Then, the pressure in the vacuum chamber 5 is returned to the atmospheric pressure, and the display device 3 shown in fig. 12 and 13 is taken out.

In embodiment 2, the two display panels 2 are not pressed against the surface curved from the end portions of the display panels 2. The display panel 2 is gradually attached to the front panel 1 from the center to both ends of the display panel 2. Thus, the difference in the local elongation is generated on both sides of the center of the display panel 2 in the display panel 2 and cancelled out. As a result, the display quality of the display panel 2 is suppressed from being degraded.

As described above, the pressure bonding apparatus 100 can bond the display panel 2 at an arbitrary position corresponding to the front panel 1 including the curved portion 15 having the curvature R2 and the curved portion 16 having the curvature R3 different from the curvature R2, depending on the position of the carrier sheet 4. The pressure bonding apparatus 100 can bond the display panel 2 at an arbitrary position corresponding to the front panel 1 including the concave surface and the convex surface according to the position of the carrier sheet 4.

This can suppress a difference in local elongation occurring in the display panel 2. The pressure bonding apparatus 100 can simultaneously bond a plurality of plate-shaped display panels 2 as the 2 nd workpiece to the plate-shaped front panel 1 as the 1 st workpiece having a curved portion. This can shorten the manufacturing time of the display device 3 and reduce the cost of the display device 3.

By changing the thicknesses of the

elastic bodies

24 and 25, it is possible to sufficiently apply the pressing force of pressing the display panel 2 against the curved surface portion 15 and the curved surface portion 16, respectively, which are different in distance from the installation table 61. As a result, even the front panel 1 having the uneven shape can be attached to the plurality of display panels 2. In addition, the display panel 2 is less likely to fall off from the front panel 1.

(embodiment mode 3)

Fig. 18 is a structural diagram of a pressure bonding apparatus according to embodiment 3. Fig. 19 is a configuration diagram for explaining an operation of the pressure bonding device according to embodiment 3. In the description of embodiment 3, the same components as those in embodiment 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

The pressure bonding apparatus 100 includes a vacuum chamber 5, a vacuum source 51, a stage 10, an elastic body 20, a fixing table 62, setting tables 61 and 63, a lifting device 65, a pipe 52, and a control device 30. In the pressure bonding apparatus according to embodiment 3, the carrier sheet 4 described in embodiment 1 is not used. The display panel 2 is directly attached to the elastic body 20.

Next, a method for manufacturing a display device using the pressure bonding device 100 of embodiment 3 will be described. First, in the preparation step, as shown in fig. 18, three display panels 2 are attached to the pressure receiving surface 20F of the elastic body 20 in the vacuum chamber 5 via the adhesive layer. At this time, an adhesive layer is also previously attached to the display panel 2 on the side opposite to the front panel 1. The pressure receiving surface 20F side adhesive layer has a lower adhesive force than the adhesive layer on the side facing the front panel 1.

In the preparation step, the front panel 1 is fixed in close contact with the fixing portion 11, and the front panel 1 is attached to the stage 10 via an adhesive layer. The front panel 1 may be attached to the stage 10 before or after the first display panel 2 is attached to the carrier sheet 4, or simultaneously.

As shown in fig. 18, the elastic body 20 has a concave pressure receiving surface 20F along the fixing surface 11F of the fixing portion 11. Therefore, the distances D1, D2, and D3 between the display panels 2 and the front panel 1 are the same.

After the pressure in the vacuum chamber 5 reaches a predetermined pressure, a pressure bonding step of bonding the display panel 2 to the front panel 1 is performed. As shown in fig. 19, the controller 30 sets the elevating device 65 to the raised state, and decreases the distance between the installation table 61 and the installation table 63.

As a result, the distance between the elastic body 20 and the fixing portion 11 of the stage 10 is reduced, and the three display panels 2 are brought into contact with the front panel 1. In the pressure bonding step, when the front panel 1 abuts against the first display panel 2, the display panel 2 is sandwiched between the elastic body 20 and the front panel 1.

After the pressure bonding step, in the peeling step, the controller 30 lowers the lifting device 65 to increase the distance between the installation table 61 and the installation table 63. Thereby, the elastic body 20 is peeled from the three display panels 2 while the three display panels 2 are bonded to the front panel 1.

As described above, the pressure bonding apparatus 100 pressure-bonds the display panel 2 to the 2 nd surface 1R of the front panel 1 by holding the display panel 2 by the elastic body 20 and bringing the distance between the elastic body 20 and the stage 10 close.

As described above, according to the method of manufacturing the display device 3, the plurality of display panels 2 smaller than the front panel 1 can be bonded to the light-transmitting front panel 1 having the curved portion. The method of manufacturing the display device 3 includes a preparation step, a pressure bonding step, and a peeling step. The preparation step mounts the display panel 2 to at least one elastic body 20 having elasticity, and mounts the front panel 1 to the stage 10 facing the elastic body 20. In the pressure bonding step, after the preparation step, the display panel 2 is held between the elastic body 20 and the stage 10, and each display panel 2 is pressure bonded to a different position of the front panel 1. In the peeling step, the distance between the elastic body 20 and the stage 10 is increased, and the display panel 2 is peeled from the elastic body 26.

This can suppress a difference in local elongation occurring in the display panel 2. The pressure bonding apparatus 100 simultaneously bonds the plurality of plate-shaped display panels 2 as the 2 nd workpiece to the plate-shaped front panel 1 as the 1 st workpiece having the curved portion. This can shorten the manufacturing time of the display device 3 and reduce the cost of the display device 3.

Alternatively, as shown in the modification of embodiment 1, the display panels 2 as the 2 nd workpieces may be pressure-bonded to the 2 nd surface 1R of the front panel 1 as the 1 st workpiece one by one using the

elastic bodies

21, 22, and 23.

Thus, by deforming the plurality of display panels 2 one by one, the accuracy of the sticking position can be improved and the display quality can be suppressed from being degraded. And a difference in local elongation occurring in the display panel 2 can be suppressed.

According to embodiment 3, the accuracy of the sticking position of the plurality of display panels 2 can be improved, and the degradation of the display quality can be suppressed. And a difference in local elongation occurring in the display panel 2 can be suppressed.

(embodiment mode 4)

Fig. 20 is a structural diagram of a pressure bonding apparatus according to embodiment 4. Fig. 21 is a configuration diagram for explaining an operation of the pressure bonding apparatus according to embodiment 4. In the description of embodiment 4, the same components as those in embodiment 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

In embodiment 3, an example in which the curvature of the curved surface portion of the front panel 1 is constant over the entire surface has been described, but a plurality of curved surface portions of the front panel 1 may be provided. In addition, the front panel 1 may also be provided with curved surface portions having different curvatures. The front panel 1 may be provided with a plurality of curved portions, and these curved portions may be curved portions including a concave curved portion and a convex curved portion.

The pressure bonding apparatus 100 includes a vacuum chamber 5, a vacuum source 51, a stage 10, an elastic body 26, fixing tables 62, 64, setting tables 61, 63, elevating

devices

65, 66, a pipe 52, and a control device 30. The carrier sheet 4 described in embodiment 1 is not used in the pressing device of embodiment 4. The display panel 2 is directly attached to the elastic body 26.

Next, a method for manufacturing a display device using the pressure bonding device 100 of embodiment 4 will be described. First, in the preparation step, as shown in fig. 20, two display panels 2 are attached to the pressure receiving surfaces 26FA and 26FB of the elastic body 26 in the vacuum chamber 5 via the adhesive layer. In this case, an adhesive layer is also bonded to the display panel 2 on the side opposite to the front panel 1. The pressure receiving surfaces 26FA and 26FB have a smaller adhesive force than the adhesive layer on the side facing the front panel 1.

Further, in the preparation step, the front panel 1 is fixed in close contact with the fixing portion 11, and the front panel 1 is attached to the stage 10 via an adhesive layer. The front panel 1 may be attached to the stage 10 before or after the display panel 2 is attached to the carrier sheet 4, or simultaneously.

As shown in fig. 20, the elastic body 26 has a concave pressure receiving surface 26FA along the fixing surface 11F of the fixing portion 11. As shown in fig. 20, the elastic body 26 has a convex pressure receiving surface 26FB along the fixing surface 12F of the fixing portion 12. Therefore, the distances D5 and D6 between the display panels 2 and the front panel 1 are the same.

After the pressure in the vacuum chamber 5 reaches a predetermined pressure, a pressure bonding step of bonding the display panel 2 to the front panel 1 is performed. As shown in fig. 21, the controller 30 sets the elevating device 65 to the raised state to reduce the distance between the installation table 61 and the installation table 63.

As a result, the distance between the elastic body 26 and the fixing portion 11 of the stage 10 is reduced, and the two display panels 2 are brought into contact with the front panel 1. In the pressure bonding step, when the front panel 1 and the display panel 2 are in contact with each other, the display panel 2 is sandwiched between the elastic body 26 and the front panel 1.

After the pressure bonding step, in the peeling step, the controller 30 lowers the lifting device 65 to increase the distance between the installation table 61 and the installation table 63. Thereby, the elastic body 26 is peeled from the display panel 2 while the display panel 2 is bonded to the front panel 1.

In the pressure bonding step, the controller 30 may set the elevating device 66 to a lowered state to reduce the distance between the installation table 61 and the installation table 63. In this case, in the peeling step, the controller 30 raises the lifting device 66 to increase the distance between the installation table 61 and the installation table 63.

As described above, the pressure bonding apparatus 100 pressure-bonds the display panel 2 to the 2 nd surface 1R of the front panel 1 by holding the display panel 2 by the elastic body 26 and bringing the distance between the elastic body 20 and the stage 10 close.

As described above, according to the method of manufacturing the display device 3, the plurality of display panels 2 smaller than the front panel 1 can be bonded to the light-transmitting front panel 1 having the curved portion. The method of manufacturing the display device 3 includes a preparation step, a pressure bonding step, and a peeling step. In the preparation step, the display panel 2 is attached to at least one elastic body 26 having elasticity, and the front panel 1 is attached to the flat stage 10 facing the elastic body 26. In the pressure bonding step, after the preparation step, the display panel 2 is held between the elastic body 26 and the stage 10, and each display panel 2 is pressure bonded to a different position of the front panel 1. In the peeling step, the distance between elastic body 26 and stage 10 is increased, and display panel 2 is peeled off from elastic body 26.

According to embodiment 4, the accuracy of the sticking position of the plurality of display panels 2 can be improved, and the degradation of the display quality can be suppressed. Further, the difference in the amount of local elongation occurring in the display panel 2 can be suppressed.

(embodiment 5)

Fig. 22 is a structural diagram of a pressure bonding apparatus according to embodiment 5. Fig. 23 is a configuration diagram for explaining an operation of the pressure bonding apparatus according to embodiment 5. In the description of embodiment 5, the same components as those in embodiment 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

The pressure bonding apparatus 100 includes a vacuum chamber 5, a vacuum source 51, a pressure source 34, a stage 10, an attaching unit 8, setting tables 61 and 63, a control valve 31,

pipes

36, 35, 52, and 53, and a control device 30.

The attachment unit 8 includes a setting table 63, a sealing member 6, and a diaphragm 7. The sealing member 6 is a member that is provided around the diaphragm 7 and seals a space between the installation table 63 and the diaphragm 7.

The diaphragm 7 is an elastic member. The elastic member is formed of a sheet-like synthetic rubber or elastomer having a uniform film thickness when no pressure is applied. The elastic member may be natural rubber.

The control valve 31 is an electromagnetic valve having a solenoid, and switches between a pressure-reducing state and a pressure-increasing state by the operation of the solenoid based on a command from the control device 30. The control valve 31 is of a two-position three-way type, but is not limited thereto. For example, the control valve 31 may be a three-position three-way type that can select any one of a pressure reduction state, a closed state, and a pressure increase state.

The control valve 31 connects the space surrounded by the diaphragm 7, the sealing member 6, and the installation table 63 to the vacuum source 51 via the pipe 36 and the pipe 53 in a reduced pressure state. The control valve 31 does not supply the gas from the pressure source 34 to the space surrounded by the diaphragm 7, the sealing member 6, and the installation table 63 in the depressurized state.

The control valve 31 connects a space surrounded by the diaphragm 7, the sealing member 6, and the installation table 63 to the pressure source 34 via the pipe 36 and the pipe 35 in a pressurized state. The control valve 31 supplies the gas from the pressure source 34 to a space surrounded by the diaphragm 7, the sealing member 6, and the installation table 63 in a pressurized state.

Next, a method for manufacturing a display device using the pressure bonding apparatus 100 will be described. First, in the preparation step, as shown in fig. 22, the elastic body 27 is attached to the stage 10 side of the diaphragm 7 in the vacuum chamber 5. The periphery of the elastic body 27 is covered with a mask 9 made of a plate material having higher rigidity than the diaphragm 7, such as metal. The display panel 2 is attached to the elastic body 27 via an adhesive layer. In this case, an adhesive layer is also previously attached to the display panel 2 on the side opposite to the front panel 1. The adhesive strength of the adhesive layer on the side of the separator 7 is smaller than that of the adhesive layer on the side opposite to the front panel 1.

Further, in the preparation step, the front panel 1 is fixed in close contact with the fixing portion 11, and the front panel 1 is attached to the stage 10 via an adhesive layer. The front panel 1 may be attached to the stage 10 before or after the display panel 2 is attached to the elastic body 27, or may be attached at the same time.

After the preparation step, a pressure reduction step of reducing the pressure in the vacuum chamber 5 is performed. The controller 30 drives the vacuum source 51 by setting the control valve 31 to a reduced pressure state, and controls the operation of the vacuum source 51 to control the pressure in the vacuum chamber 5.

After the pressure in the vacuum chamber 5 reaches a predetermined pressure, a pressure bonding step of bonding the display panel 2 to the front panel 1 is performed. As shown in fig. 23, the controller 30 sets the control valve 31 in a pressurized state to increase the pressure in the space surrounded by the diaphragm 7, the sealing member 6, and the installation table 63. In the pressure bonding step, a pressure difference is generated between the pressure in the vacuum chamber 5 and the pressure in the space surrounded by the diaphragm 7, the sealing member 6, and the mounting table 63, and the diaphragm 7 deforms. Thereby, the diaphragm 7 not covered with the mask 9 is deformed, and the volume of the space surrounded by the diaphragm 7, the sealing member 6, and the mounting table 63 is increased.

As a result, the distance between the elastic body 27 and the fixing portion 11 of the stage 10 is reduced, and the display panel 2 attached to the elastic body 27 is brought into contact with the front panel 1.

After the pressure bonding step, in the peeling step, the control valve 31 is switched from the pressurized state to the depressurized state to peel the elastic body 27 from the display panel 2. After the elastic body 27 is peeled off from the display panel 2, the pressure in the vacuum chamber 5 is returned to the atmospheric pressure.

Next, as shown in fig. 24, elastic body 28 is attached to stage 10 side of diaphragm 7 at a position different from elastic body 27 shown in fig. 23. The periphery of the elastic body 28 is covered with a mask 9 made of a plate material having higher rigidity than the diaphragm 7, such as metal. The display panel 2 is attached to the elastic body 28 via an adhesive layer. The pressure reduction step is performed after the preparation step.

After the pressure in the vacuum chamber 5 reaches a predetermined pressure, a pressure bonding step of bonding the display panel 2 to the front panel 1 is performed. As shown in fig. 24, the controller 30 sets the control valve 31 in a pressurized state to increase the pressure in the space surrounded by the diaphragm 7, the sealing member 6, and the installation table 63. In the pressure bonding step, a pressure difference is generated between the pressure in the vacuum chamber 5 and the pressure in the space surrounded by the diaphragm 7, the sealing member 6, and the mounting table 63, and the diaphragm 7 deforms. Thereby, the diaphragm 7 not covered with the mask 9 is deformed, and the volume of the space surrounded by the diaphragm 7, the sealing member 6, and the mounting table 63 is increased.

As a result, the distance between the elastic body 28 and the fixing portion 11 of the stage 10 is reduced, and the display panel 2 attached to the elastic body 28 is brought into contact with the front panel 1.

After the pressure bonding step, the control valve 31 is switched from the pressurized state to the depressurized state to peel the elastic body 28 from the display panel 2 in the peeling step. After the elastic body 28 is peeled off from the display panel 2, the pressure in the vacuum chamber 5 is returned to the atmospheric pressure.

Next, as shown in fig. 25, elastic body 29 is attached to the stage 10 side of diaphragm 7 at a position different from elastic body 27 shown in fig. 23 and elastic body 28 shown in fig. 24. The periphery of the elastic body 29 is covered with a mask 9 made of a plate material having higher rigidity than the diaphragm 7, such as metal. The display panel 2 is attached to the elastic body 29 via an adhesive layer. The pressure reduction step is performed after the preparation step.

After the pressure in the vacuum chamber 5 reaches a predetermined pressure, a pressure bonding step of bonding the display panel 2 to the front panel 1 is performed. As shown in fig. 25, the controller 30 sets the control valve 31 in a pressurized state to increase the pressure in the space surrounded by the diaphragm 7, the sealing member 6, and the installation table 63. In the pressure bonding step, a pressure difference is generated between the pressure in the vacuum chamber 5 and the pressure in the space surrounded by the diaphragm 7, the sealing member 6, and the mounting table 63, and the diaphragm 7 deforms. Thereby, the diaphragm 7 not covered with the mask 9 is deformed, and the volume of the space surrounded by the diaphragm 7, the sealing member 6, and the mounting table 63 is increased.

As a result, the distance between the elastic body 29 and the fixing portion 11 of the stage 10 is reduced, and the display panel 2 attached to the elastic body 29 is brought into contact with the front panel 1.

After the pressure bonding process, the control valve 31 is switched from the pressurized state to the depressurized state so that the elastic body 29 is peeled from the display panel 2 in the peeling process. After the elastic body 29 is peeled off from the display panel 2, the pressure in the vacuum chamber 5 is returned to the atmospheric pressure. Then, the display device 3 shown in fig. 1 and 2 is taken out.

As described above, the pressure bonding apparatus 100 includes the vacuum chamber 5, the stage 10, and the attachment unit 8. The stage 10 is disposed in the vacuum chamber 5, and has a shape that is overlapped and fixed on the 1 st surface 1F of the front panel 1 and extends along the 1 st surface 1F. The sticking units 8 deform the diaphragms 7 having elasticity by internal pressure. The distance between any one of the

elastic bodies

27, 28, and 29 and the stage 10 changes in accordance with the deformation of the diaphragm 7. Thus, the display panel 2 attached to the

elastic bodies

27, 28, and 29 is pressed against the 2 nd surface 1R of the front panel 1.

According to this configuration, the same operational effects as those of embodiment 1 are obtained. In addition, in the pressure bonding apparatus 100 according to embodiment 5, the display panel 2 can be bonded at an arbitrary position corresponding to a plurality of sizes of the front panel 1.

It is to be understood that other operational effects of the embodiments described in the present embodiment can be obtained by the present invention, as is obvious from the description of the present specification or as can be appropriately conceived by those skilled in the art.

Claims

1. A pressure bonding apparatus for bonding a plurality of plate-like 2 nd workpieces smaller than a plate-like 1 st workpiece having a curved surface portion to the plate-like 1 st workpiece, the pressure bonding apparatus comprising:

a vacuum chamber;

a stage arranged in the vacuum chamber and on which the 1 st workpiece is placed; and

an elastic body having more elasticity than the carrier,

the 2 nd workpiece is pressed against the 1 st workpiece by bringing the elastic body closer to the stage.

2. Crimping device according to claim 1,

the curvature of the curved surface portion of the 1 st workpiece is fixed in the entire surface.

3. Crimping device according to claim 1,

the 1 st workpiece has a plurality of curved surface portions, each of which has a different curvature.

4. Crimping device according to claim 1,

the 1 st workpiece has a plurality of curved surface portions including a concave curved surface portion and a convex curved surface portion.

5. Crimping device according to claim 1,

the elastic body is driven by the lifting device to change the distance between the elastic body and the carrier.

6. Crimping device according to claim 1,

the bearing sheet is inserted between the elastic body and the carrying platform, and the No. 2 workpiece attached to the bearing sheet and the bearing sheet are clamped between the elastic body and the carrying platform.

7. Crimping device according to claim 1,

the elastic body is provided with a diaphragm on which the elastic body is mounted, and the distance between the elastic body and the carrier is changed according to the deformation of the diaphragm.

8. Crimping device according to claim 1,

the elastic body has a pressure receiving surface on a surface facing the stage,

the pressure receiving surface is along the 1 st surface of the stage that is opposed to the pressure receiving surface.

9. Crimping device according to one of claims 1 to 8,

the 1 st workpiece is a light-transmitting front panel, and the 2 nd workpiece is a display panel.

10. A method of manufacturing a display device in which a plurality of display panels smaller than a front panel having a curved surface portion and being light-transmissive are bonded to the front panel, the method comprising:

a preparation step of attaching the front panel to a stage opposed to an elastic body having elasticity, and attaching the display panel to a carrier sheet inserted between the elastic body and the front panel; and

and a pressure bonding step of, after the preparation step, pressing the display panel against the front panel by sandwiching the carrier sheet and the display panel between the elastic body and the stage.

11. A method of manufacturing a display device in which a plurality of display panels smaller than a front panel having a curved surface portion and being light-transmissive are bonded to the front panel, the method comprising:

a preparation step of attaching the display panel to an elastic body having elasticity, and attaching the front panel to a stage that faces the elastic body; and

and a pressure bonding step of, after the preparation step, pressing the display panel against the front panel by sandwiching the display panel between the elastic body and the stage.

12. The method for manufacturing a display device according to claim 10 or 11,

the curvature of the curved portion of the front panel is fixed in the entire surface.

13. The method for manufacturing a display device according to claim 10 or 11,

the front panel has a plurality of curved portions, each curved portion having a different curvature.

14. The method for manufacturing a display device according to claim 10 or 11,

the front panel has a plurality of curved portions including a concave curved portion and a convex curved portion.