JP6456166B2 - Image display device and manufacturing method thereof - Google Patents

Description

  The present invention relates to an image display device and a manufacturing method thereof.

  In the image display device, for example, a protective plate may be disposed on the display surface side of a display panel that displays an image. The protective plate is disposed for the purpose of improving visibility, imparting design properties, imparting fastness, and the like. In the image display device having such a configuration, when an air layer exists between the display panel and the protection plate, external light incident on the image display side of the image display device is displayed on the back surface of the protection plate, the display panel. Reflected by the surface, etc., accompanied by a decrease in visibility. In this specification, the visibility means the visibility of an image displayed by the image display device.

  Therefore, the image display device having such a configuration eliminates the air layer by adopting a structure in which the display panel and the protective plate are bonded together via an adhesive member. There are the following methods for attaching the display panel and the protective plate together via an adhesive member. After the adhesive part agent is printed on the back side of the protective plate in a planar shape, ultraviolet rays are irradiated in this state to temporarily cure the adhesive part agent. Then, the temporarily cured adhesive part and the display panel are brought into contact with each other, and the temporarily cured adhesive part is fully cured. The fully cured adhesive part becomes an adhesive member after curing, and a structure in which the display panel and the protective plate are bonded to each other through the adhesive member is obtained (for example, Patent Document 1). On the display surface side of the display panel, the adhesive member may be printed in a planar shape, and the protective plate may be brought into contact with the temporarily cured adhesive member.

  Further, even in an image display device in which a touch panel is disposed between the display panel and the protective plate, in order to eliminate an air layer between the display panel and the touch panel and between the touch panel and the protective plate, the adhesive members are used. It is pasted through. The method is also similar to the method described above.

Japanese Patent No. 5138820

  Such an image display apparatus includes a first panel and a second panel bonded to the first panel via an adhesive member. In such an image display device, there has been a problem that peeling occurs between the first panel and the adhesive member or between the second panel and the adhesive member.

  When the adhesive member of such an image display device is viewed in cross section, a first corner formed by a side surface at the end point of the first adhesive surface that is an adhesive surface with the first panel and the first adhesive surface, Or the 2nd angle | corner which the side surface and the 2nd adhesive surface in the end point of the 2nd adhesive surface which is an adhesive surface with a 2nd panel comprised was an obtuse angle. When a force is applied to the first adhesive surface and the second adhesive surface of such an image display device in the direction in which the first panel and the second panel are peeled from the adhesive member, the adhesive surface with the adhesive member This is because the peeling stress concentrates on the end portion where the angle formed by the side surface and the bonding surface at the end point is an obtuse angle.

  The present invention has been made to solve the above-described problems, and reduced the occurrence of peeling between the first panel and the adhesive member and between the second panel and the adhesive member. An object is to obtain an image display device.

An image display device according to the present invention includes a first panel and a second panel bonded to the first panel via an adhesive member, and the adhesive member is a first panel when viewed in cross section. The first bonding surface and the side surface, which are the bonding surfaces of the first bonding surface , and the first corner formed by the end points of the first bonding surface , and the second bonding surface and the side surface which are the bonding surfaces with the second panel are the first Any of the second angles formed by the end points of the two adhesive surfaces is in the range of 10 to 60 degrees.

The image display apparatus according to the present invention can reduce the occurrence of peeling between the first panel and the adhesive member and between the second panel and the adhesive member. In the image display device according to the present invention, the first corner formed by the end point of the first bonding surface and the bonding surface with the second panel are the bonding surface with the first panel and the side surface of the adhesive member . Any of the second angles formed by the end points of the second adhesive surface between the second adhesive surface and the side surface of the adhesive member is in the range of 10 to 60 degrees. Therefore, when stress is applied to the first adhesive surface and the second adhesive surface in the direction in which the first panel and the second panel are peeled off from the adhesive member, the peeling is applied to the end portion of the adhesive member. The concentration of stress can be reduced.

1 is an exploded perspective view showing a configuration of an image display device 100 according to a first embodiment. 1 is a side view showing a configuration of an image display device 100 according to a first embodiment. It is a process flow figure showing a manufacturing method of image display device 100 concerning Embodiment 1 of the present invention. It is a figure explaining the manufacturing method of the image display apparatus 100 concerning Embodiment 1 of this invention, Comprising: It is a figure explaining a 1st process. It is a figure explaining the manufacturing method of the image display apparatus 100 concerning Embodiment 1 of this invention, Comprising: It is a figure explaining a 3rd process. It is a figure explaining the manufacturing method of the image display apparatus 100 concerning Embodiment 1 of this invention, Comprising: It is a figure explaining a 4th process. It is a disassembled perspective view which shows the structure of the image display apparatus 200 concerning this Embodiment 2. FIG. It is a side view which shows the structure of the image display apparatus 200 concerning this Embodiment 2. FIG. It is a process flow figure showing a manufacturing method of image display device 200 concerning Embodiment 2 of the present invention. It is a figure explaining the manufacturing method of the image display apparatus 200 concerning Embodiment 2 of this invention, Comprising: It is a figure explaining a 7th process. It is a figure explaining the manufacturing method of the image display apparatus 200 concerning Embodiment 2 of this invention, Comprising: It is a figure explaining a 9th process. It is a figure explaining the manufacturing method of the image display apparatus 200 concerning Embodiment 2 of this invention, Comprising: It is a figure explaining a 10th process.

Embodiment 1 FIG.
A configuration of the image display apparatus according to the first embodiment of the present invention will be described. FIG. 1 is an exploded perspective view showing the configuration of the image display apparatus 100 according to the first embodiment. FIG. 2 is a side view showing the configuration of the image display apparatus 100 according to the first embodiment.

  The image display device 100 is a PC (Personal Computer) monitor, a mobile terminal such as a PDA (Personal Digital Assistant), a game machine, a television receiver, a car navigation device, an in-vehicle monitor, a tablet terminal, or the like. As shown in FIG. 1, the image display apparatus 100 according to the first embodiment of the present invention includes a protection plate 50 as a first panel in order from the side on which an image is displayed and the side on which external light strikes, and a second panel. It is assumed that the display panel 11 is laminated and the protective plate 50 and the display panel 11 are bonded together with the adhesive member 30 interposed therebetween. In Embodiment 1 of the present invention, the display panel 11 is described as a liquid crystal display device, but may be an organic electroluminescence display device. Since the display panel 11 according to Embodiment 1 of the present invention is a liquid crystal display device, the display panel 11 includes a liquid crystal substrate 10 and a polarizing member 20. The liquid crystal substrate 10 has a display surface 10a for displaying an image. The protection plate 50 has translucency so that an image displayed on the display panel 11 can be visually recognized, and includes a printing layer 40 for shielding a peripheral region from the viewpoint of visibility and design. As shown in FIG. 1, the printed layer 40 has a closed loop shape and has an opening and an opening end 42.

  As shown in FIG. 2, the polarizing member 20 is attached to the display surface 10 a that displays an image, which is one surface of the liquid crystal substrate 10, and the other surface. The polarizing member 20 is, for example, a polarizing film that is formed in a film shape and can be attached to the liquid crystal substrate 10. The polarizing member 20 may be a polarizing plate that is attached to the liquid crystal substrate 10 using an adhesive. A hard coat layer, an antiglare layer, and the like may be provided on the surface of the polarizing member 20 as appropriate.

  Here, as shown in FIG. 2, the protective plate 50 has a front surface 50a and a back surface 50b. The back surface 50 b of the protection plate 50 is a surface that adheres to the adhesive member 30. And as shown in FIG. 2, the surface which adhere | attaches the protection board 50 of the adhesion member 30 is the 1st adhesion surface 30b. The surface of the adhesive member 30 that adheres to the display panel 11 is the second adhesive surface 30a. The surface of the display panel 11 that adheres to the adhesive member 30 is the surface 11 a of the display panel 11. The image display device 100 also uses a backlight unit, flexible wiring, an adhesive tape that fixes the display panel 11, screws, and the like.

  Although the surface 11a of the display panel 11 and the second adhesive surface 30a show the same position in the drawing, the surface 11a of the display panel 11 is the entire surface surrounded by the outer periphery of the display panel 11, and is a polarizing member. 20 shows the entire surface surrounded by the outer periphery, and the second adhesive surface 30a shows a portion where the adhesive member 30 is in contact with the surface 11a of the display panel 11. Similarly, the back surface 50b of the protection plate 50 and the first adhesive surface 30b are shown at the same position in the drawing, but the back surface 50b of the protection plate 50 shows the entire surface surrounded by the outer periphery of the protection plate 50, One adhesive surface 30 b indicates a portion where the adhesive member 30 is in contact with the back surface 50 b of the protective plate 50 or the printed layer 40.

  The adhesive member 30 has translucency. The adhesive member 30 suppresses the deterioration of the display quality of the image. When an air layer exists between the display panel 11 and the protective plate 50, external light directed to the display surface 10a of the liquid crystal substrate 10 is reflected by the back surface 50b of the protective plate 50, the display surface 10a of the liquid crystal substrate 10, and the like. Decreases. As a result, the display quality deteriorates, so that the air layer is filled with the adhesive member 30 between the display panel 11 and the protective plate 50, and the display panel 11 and the protective plate 50 are bonded together via the adhesive member 30.

  The adhesive member 30 is formed on the back surface 50 b of the protection plate 50. The layer in which the pressure-sensitive adhesive member 30 is formed is not limited to a single layer, and may be formed of a plurality of layers. However, in the first embodiment of the present invention, the number of layers is one. The refractive index of the adhesive member 30 is substantially equal to the refractive index of the protective plate 50. The material of the adhesive member 30 will be described after describing the method for manufacturing the image display device 100 according to the first embodiment of the present invention described later.

  When the adhesive member 30 of the image display device 100 according to the first embodiment of the present invention is viewed in cross section, the first corner formed by the side surface 30c and the first adhesive surface 30b at the end point of the first adhesive surface 30b. , And the second angle formed by the side surface 30c and the second bonding surface 30a at the end point of the second bonding surface 30a is 90 degrees or less. In FIG. 2, the side surface 30c is illustrated as a straight line, but is actually a curved line, and the side surface 30c is a curved surface. By using the side surface 30c and a curved surface, when the stress is applied to the adhesive member 30 in the direction in which the protective plate 50 and the display panel 11 are peeled off from the adhesive member 30 as compared with the case where the side surface 30c is formed as a flat surface. The stress distribution in the adhesive member 30 can be dispersed. Therefore, it is possible to suppress the crack from entering the adhesive member 30.

  The protection plate 50 is a transparent plate that hardly absorbs visible light. The protection plate 50 is a glass plate, laminated glass, resin plate, or the like whose strength has been improved by using an ion exchange method, an air cooling strengthening method, or the like. The resin plate is a plate made of polycarbonate resin, acrylic resin, cycloolefin resin, or the like. In addition, the board comprised from what laminated | stacked polycarbonate-type resin, acrylic resin, cycloolefin type resin, etc. may be sufficient.

  The back surface 50 b of the protection plate 50 is a surface facing the display panel 11. The shape of the protection plate 50 is a rectangular shape here, but may be a polygonal shape, a shape including an arc, or the like. Further, the display panel 11 is also rectangular here, like the shape of the protection plate 50, but may be polygonal, a shape including an arc, or the like. That is, the shapes of the liquid crystal substrate 20 and the polarizing member 20 are also rectangular here, like the shape of the protective plate 50, but may be polygonal shapes, shapes including arcs, or the like.

  The surface 50a of the protection plate is a surface on the side where the image displayed on the liquid crystal substrate 10 is viewed. The surface 50a may be subjected to anti-glare treatment, anti-reflection treatment for improving visibility, and hard coat treatment for preventing scratches, if necessary. The protection plate 50 of the image display apparatus 100 according to the first embodiment of the present invention is provided so as to overlap the display panel 11 via the adhesive member 30.

  Although the printed layer 40 is formed on the back surface 50b of the protective plate 50 of the image display apparatus 100 according to the first embodiment of the present invention, a protective plate 50 on which the printed layer 40 is not formed may be used. The presence or absence of the print layer 40 is not particularly limited. The back surface 50b of the protection plate 50 is a surface opposite to the front surface 50a. The print layer 40 is a layer for decoration (for decoration). The print layer 40 is not limited to decoration (decoration), and may be a layer for other purposes.

  As shown in FIG. 1, the printed layer 40 has a closed loop shape and has an opening and an opening end 42. The print layer 40 is made of a material that almost shields light having a wavelength in the visible region. The print layer 40 is configured using a paint containing a pigment of a color material. Specifically, for example, an acrylic resin blended with carbon black is used. The color of the print layer 40 is, for example, black, but may be a color having a light shielding property, and may be a color other than black. The print layer 40 is formed in accordance with the display area of the display panel 11, that is, the display area of the liquid crystal substrate 10. From the viewpoint of design, the size of the print layer 40 is the difference in position between the end of the element provided inside the liquid crystal substrate 10 that displays the image on the display panel 11 and the open end 42 of the print layer 40. However, a size that is as small as possible is preferred.

  The print layer 40 only needs to satisfy desired performance in terms of design properties, light shielding properties, and the like, and the formation method is not particularly limited in the first embodiment of the present invention. The printing layer 40 is formed by applying a resin using a screen printing method, for example. The thickness of the print layer 40 varies depending on the intensity of the light source to be shielded from light. The thickness of the printing layer 40 is generally about 3 to 70 micrometers. When the color of the printing layer 40 is other than black, the thickness of the coating film of the printing layer 40 is about 10 to 70 micrometers in order to obtain sufficient light shielding properties. When the color of the print layer 40 is black, the thickness of the coating film of the print layer 40 is generally about 3 to 40 micrometers. Moreover, the printing layer 40 may have a desired thickness by laminating films from the viewpoint of design properties, light shielding properties, and the like. In addition, by laminating the films, it is possible to suppress problems related to design properties such as generation of pinholes when foreign matter is present, and to produce the printed layer 40 stably at a high yield.

  Next, a method for manufacturing the image display apparatus 100 according to the first embodiment of the present invention will be described. First, the display panel 11 in which the polarizing member 20 is attached to the display surface 10a of the liquid crystal substrate 10 and the protective plate 50 in which the printed layer 40 is formed on the back surface 50b are prepared. Below, it is the adhesion process with which the manufacturing method of the image display apparatus 100 concerning Embodiment 1 of this invention is provided, Comprising: The adhesion process for bonding the prepared display panel 11 and the protective plate 50 through the adhesion member 30 is carried out. Will be described in detail.

  In Embodiment 1 of the present invention, a radical polymerization type acrylic ultraviolet curable adhesive resin is used as the material of the adhesive member 30. Hereinafter, this material is referred to as an adhesive member 300. In other words, the cured resin of the adhesive member 300 is the adhesive member 30. FIG. 3 is a process flow diagram illustrating a method for manufacturing the image display apparatus 100 according to the first embodiment of the present invention, and illustrates a process of bonding the prepared display panel 11 and the protection plate 50 together via the adhesive member 30. It is a process flow diagram. The image display apparatus 100 according to the first embodiment of the present invention includes steps S1 to S6 shown in FIG.

First, the manufacturing method of the image display apparatus 100 according to the first embodiment of the present invention will be briefly described with reference to FIG. In step S <b> 1 of FIG. 3, the adhesive agent 300 is printed on the back surface 50 b of the protection plate 50. Next, in step S2, temporary curing is performed to cure the position of the printed adhesive member 300, and in step S3, the temporarily cured adhesive member 300 surface and the display panel 11 surface 11a. And the display panel 11 is swung. In step S4, the adhesive member 300 is pressed against the display panel 11, and in step S5, the protection plate 50 and the display panel 11 are slightly pulled apart. Finally, in step S6, the adhesive member 300 is fully cured. The adhesive member 300 becomes the adhesive member 30 after the main curing. Then, the protection plate 50 and the display panel 11 are bonded together via the adhesive member 30.

  Next, details of step S1 to step S6 shown in FIG. 3 will be described. Step S <b> 1 is a first step, and is a surface facing the display panel 11 of the protection plate 50, and the adhesive part agent 300 is printed in a planar shape on the back surface 50 b of the protection plate 50. FIG. 4 is a diagram for explaining the manufacturing method of the image display apparatus 100 according to the first embodiment of the present invention, and is a diagram for explaining the first step. As shown in FIG. 4, the adhesive member 300 is a surface facing the display panel 11 of the protection plate 50 and is printed in a planar shape on the back surface 50 b of the protection plate 50. The surface of the pressure-sensitive adhesive member 300 that is subsequently bonded to the display panel 11 is shown as a second bonding surface 300a. The surface bonded to the protective plate 50 of the adhesive member 30 is a first bonding surface 300b. The first adhesive surface 300b is a surface that becomes the first adhesive surface 30b when the adhesive member 300 becomes the adhesive member 30 after the main curing. The second adhesive surface 300a is a surface that becomes the second adhesive surface 30a when the adhesive member 300 becomes the adhesive member 30 after the main curing.

  Further, in FIG. 4, the outer periphery of the first bonding surface 300 b is shown as a peripheral portion 301, and the outer periphery of the protective plate 50 is shown as an outer peripheral portion 501. Moreover, it is the 1st angle | corner which the side surface in the end point of the 1st adhesion surface 300b of the adhesion part agent 300 and the 1st adhesion surface 300b comprise, Comprising: The angle | corner in the adhesion part agent 300 is shown as the angle | corner 30A. . The corner 30 </ b> A is an angle formed by the adhesive surface of the adhesive member 300 with the protective plate 50 and the side surface of the adhesive member 300.

  Here, the adhesive part 300 was printed almost uniformly with a thickness of about 200 micrometers in a planar shape by a slit coating method. The printing method and thickness of the adhesive part 300 are not particularly limited. Another printing method that can print the adhesive part 300 in a planar shape is a screen printing method. The printing method and thickness can be changed as appropriate in accordance with other components.

  Next, step S2 is a second step, and temporary curing is performed to cure the position of the peripheral portion 301 of the adhesive member 300 printed in step S1. 30% or more by irradiating the surface of the adhesive member 300 with ultraviolet light so as to obtain an integrated light amount of 0.3 Joule / square centimeter from the second adhesive surface 300a side to be bonded to the display panel 11 thereafter. Temporarily cured at a curing degree of 80% or less. The degree of cure of the temporary curing is appropriately determined depending on the material used for the pressure-sensitive adhesive member because the hardness of the pressure-sensitive adhesive member 300 after the temporary curing varies depending on the material. Further, it varies depending on the limitation of processing time, the size of the protective plate 50 and the display panel 11 to be bonded, and the like. Here, the degree of cure was 50% or more and 80% or less. In the first embodiment of the present invention, it is assumed that the size of the protection plate 50 and the display panel 11 is about 12 inches diagonal.

  The adhesive part 300 that has undergone step S2 is in a semi-cured state and does not have such fluidity that the position of the peripheral part 301 of the adhesive part 300 changes. In Embodiment 1 of the present invention, since the radical polymerization type acrylic ultraviolet curable pressure sensitive adhesive resin is used for the pressure sensitive adhesive agent 300, the second adhesive surface 300a of the pressure sensitive adhesive agent 300 is inhibited from being cured by oxygen. Received and not cured. Therefore, the outermost surface of several micrometers is not cured.

  The adhesive member 300 is formed so as to cover the opening of the printing layer 40 formed on the back surface 50b of the protective plate 50. That is, the peripheral edge portion 301 of the adhesive member 300 is in contact with the printed layer 40 formed in a closed loop shape. Regarding the cross-sectional shape of the end portion of the adhesive member 300, the peripheral portion 301 of the adhesive member 300 is closest to the outer peripheral portion 501 of the protection plate 50. And it inclines in the direction which goes to the center of the adhesion part agent 300 between the peripheral part 301 of the adhesion part agent 300 and the 2nd adhesion surface 300a of the adhesion part agent 300. FIG. Therefore, as the pressure-sensitive adhesive agent 300 is viewed from above, the size of the pressure-sensitive adhesive agent 300 decreases as the pressure-sensitive adhesive agent 300 approaches the second adhesive surface 300a from the first adhesive surface 300b.

  That is, the thickness of the adhesive part agent 300 becomes thinner as the outer peripheral part 501 of the protective plate 50 is approached. The angle of the corner 30A is 90 degrees or less. The cross-sectional shape of the adhesive part 300 becomes the above-described shape when the adhesive member is applied to the surface by a printing method such as a slit coat method, and the protective plate 50 or the printing layer 40 and the adhesive part 300 The adhesive member 300 that contacts the protective plate 50 wets and spreads, but does not contact the protective plate 50, depending on the contact angle formed by, i.e., the wettability of the adhesive member 300 to the protective plate 50 and the printing layer 40. This is because 300 is drawn toward the center of the region applied by surface tension. In the first embodiment of the present invention, treatments generally known as wettability improvement treatments such as ozone treatment and plasma treatment are performed on the surface of the protective plate 50 and the adhesive layer 300 of the printing layer 40 to be applied. Not performed.

  Next, step S3 is a third step, in which the second adhesive surface 300a of the adhesive member 300 printed on the back surface 50b of the protective plate 50 and temporarily cured is brought into contact with the surface 11a of the display panel 11, The display panel 11 is swung. First, since a protective film is often attached to the surface of the polarizing member 20 attached to the display panel 11, the protective film is peeled off. Next, in a vacuum of about 100 Pascal, the second adhesive surface 300a of the adhesive member 300 and the surface 11a of the display panel 11 are aligned and brought into contact with each other. Then, in this state of contact, the display panel 11 has a plus or minus 0.5 mm, that is, a width of 1 mm, with the position where the display panel 11 is brought into contact in the long side direction and the short side direction of the display panel 11 being zero. The long side and the short side of 11 are swung in the horizontal direction.

  FIG. 5 is a diagram for explaining a method for manufacturing the image display device 100 according to the first embodiment of the present invention, and is a diagram for explaining a third step. FIG. 5 shows the image display device that has undergone the third step. FIG. 5 shows a second corner formed by the side surface at the end point of the second adhesive surface 300a of the adhesive member 300 and the second adhesive surface 300a, and the corner in the adhesive member 300 is defined as a corner 30B. Show. The corner 30 </ b> B is an angle formed by the adhesive surface of the adhesive member 300 with the display panel 11 and the side surface of the adhesive member 300. By swinging the display panel 11 in a state where the second adhesive surface 300a of the adhesive member 300 and the surface 11a of the display panel 11 are in contact with each other, the side surface at the end point of the second adhesive surface 300a and the second adhesive The angle 30B, which is the second angle formed by the surface 300a, can be formed to be 90 degrees or less.

  The second adhesive surface 300a of the pressure-sensitive adhesive member 300 was not cured by being inhibited by oxygen when step S2 was completed. When this is brought into contact with the surface 11a of the display panel 11 and the display panel 11 is swung in the horizontal direction, the area of the second adhesive surface 300a is increased. In other words, in the adhesive part 300, the area of several micrometers on the outermost surface that has not been cured due to the inhibition of curing by oxygen expands the area. The soft part of the adhesive 300 that is close to the outermost surface follows to some extent the area of the outermost surface expanded, but the area of the first adhesive surface 300b is changed. Therefore, the angle 30B can be formed to be 90 degrees or less.

  The alignment between the second adhesive surface 300a of the adhesive member 300 and the surface 11a of the display panel 11 is performed before the second adhesive surface 300a of the adhesive member 300 and the surface 11a of the display panel 11 are brought into contact with each other. In the state where contact has begun, the alignment is completed. In addition, the distance between the second adhesive surface 300a of the adhesive member 300 and the surface 11a of the display panel 11 is not particularly limited and is appropriately adjusted. Considering that the thickness of the adhesive part 300 is distributed before the contact and the hardness of the adhesive part 300 varies depending on the degree of cure of the adhesive part 300, the printing thickness of the adhesive part 300 is about A range of 5% to 20% is considered preferable. Further, the rocking width is preferably a rocking width smaller than a width inclined between the peripheral edge portion 301 of the adhesive member 300 and the second adhesive surface 300a of the adhesive member 300, There is no particular limitation.

  Next, step S4 is a fifth process, in which the adhesive member 300 is pressed against the display panel 11 with a pressure of about 1 megapascal. Since step S4 is performed subsequent to step S3, it is performed under a vacuum of about 100 Pascals. Step S4 is for correcting the distortion of the protective plate 50 and the display panel 11 in order to remove air bubbles that have entered between the protective plate 50 and the display panel 11 so that the adhesive member 300 has a desired thickness. What you do to do. Although the pressing time may be changed or the pressure may be changed during the pressing, the pressing time, the pressing pressure value, and the conditions for changing the pressure value are not particularly limited. It is appropriately determined according to the performance of the apparatus to be used, the processing time limit, the size of the protective plate 50 and the display panel 11 to be bonded. However, the pressure which changes the cross-sectional shape of the adhesive part agent 300 is not applied.

  The degree of vacuum in step S3 and step S4 can also be appropriately determined according to the performance of the apparatus used, the limitation of processing time, the size of the protective plate 50 and the display panel 11 to be bonded, and the like. The vacuum bonding apparatus used in Embodiment 1 of the present invention is provided with a mechanism for adjusting the gap between the second adhesive surface 300a of the adhesive member 300 and the surface 11a of the display panel 11 in units of micrometers. It was. The display panel 11 and the protection plate 50 are fixed to the upper and lower stages by vacuum suction, but may be fixed by static electricity depending on the size and material of the protection plate 50 and the display panel 11 to be bonded.

  One or both of the upper and lower stages have a mechanism that is movable in micrometer units in all directions in the horizontal direction in the planar direction. Therefore, in Step S3 in Embodiment 1 of the present invention, the second adhesive surface 300a of the adhesive member 300 printed on the back surface 50b of the protection plate 50 and temporarily cured is brought into contact with the surface 11a of the display panel 11, Although the display panel 11 is swung, the protective plate 50 may be swung, or both the protective plate 50 and the display panel 11 may be swung. By this swinging, the area of the second adhesive surface 300a may be expanded, and the angle 30B may be 90 degrees or less.

  Next, step S5 is a sixth step, in which the protective plate 50 and the display panel 11 are slightly separated. Thereby, the angles of the corners 30A and 30B can be surely made 90 degrees or less. The separation distance is not particularly limited, but it should be avoided that the adhesive member 300 is cracked and the adhesive member 300 is peeled off from the protective plate 50 or the display panel 11. .

  Next, step S6 is a fourth process, and the adhesive member 300 is fully cured. FIG. 6 is a diagram for explaining the method for manufacturing the image display device 100 according to the first embodiment of the present invention, and is a diagram for explaining the fourth step. In the first embodiment of the present invention, the ultraviolet ray 60 is irradiated and cured so as to obtain an integrated light amount of 3 joules / square centimeter from the protective plate 50 side. Thereafter, the UV light 60 is further irradiated from the side surface of the adhesive member 300 by 3 joules / square centimeter, and the portion shielded by the printing layer 40 is also cured.

  In addition, about the ultraviolet light 60 irradiation from the side surface of the adhesion part 30, when the hardening degree of the temporary hardening in step S2 is high, even if there is the printing layer 40 at the time of the ultraviolet-ray 60 irradiation from the protection board 50 side, it will harden | cure When the adhesive part 300 is used, it may not be carried out. Moreover, you may replace with the order which irradiates the ultraviolet-ray 60 from the side surface of the adhesion part agent 300, and irradiates the ultraviolet-ray 60 from the protection board 50 side after that.

  As described above, the image display apparatus 100 according to the first embodiment of the present invention is manufactured. The angles of the corners 30A and 30B of the image display device 100 according to the first embodiment of the present invention manufactured by the method described above were in the range of 10 degrees to 60 degrees.

  The material of the adhesive member 300, that is, the adhesive member 30, is, for example, an ultraviolet curable adhesive resin, and is not limited to one type of ultraviolet curable resin, but a plurality of types of ultraviolet curable resins may be used. In the first embodiment of the invention, one kind of ultraviolet curable resin is used. The adhesive part 300 can also use a thermosetting adhesive resin. In addition, adhesives that use both thermosetting and UV curing may be used. However, when thermosetting is used in combination, there are restrictions on how to store the materials and handling during manufacturing. Is often used. Further, there are cases where the material properties are adjusted and held, for example, by hardening or thixotropy to such an extent that the shape is maintained after the liquid resin is applied.

  In the method for manufacturing the image display device 100 according to the first embodiment of the present invention, one layer is used as the adhesive member 300 with the layer on which the adhesive member 30 is formed as one layer. However, the present invention is not limited thereto, and two or more kinds of materials may be used for the adhesive member 300 by forming the layer on which the adhesive member 30 is formed as a plurality of layers of two or more layers.

  In addition, a material in which the outermost surface exposed to the outside air is not cured when pre-cured in step S2, that is, a material whose surface is inhibited from hardening when pre-cured is used. However, the present invention is not limited to this. This is because even if the surface is not subject to curing inhibition during temporary curing, the adhesive part has elasticity, so that the area of the adhesive surface can be expanded by swinging in step S3.

  In the adhesive member 300, for example, in the first embodiment of the present invention, the storage elastic modulus measured under the conditions of the temperature of the adhesive member 30 at 25 degrees and the frequency of 1 hertz is 0.1 to 1 megapascals. It was. When bonding to the display panel 11, it causes display unevenness. Therefore, the adhesive member 30 needs to have high flexibility in order to relieve stress generated due to heat deformation of the display panel 11. In addition, when the adhesive member 30 is low in flexibility, it may be difficult to adhere at the interface of the polarizing member 20, and a problem of being visually recognized as bubbles may occur. In order to solve such a problem, since there is flexibility suitable for the size, type, and other components of the display panel 11, the elastic modulus of the adhesive member 300 is adjusted as appropriate.

  The effects of the image display device 100 according to the first embodiment of the present invention will be described below. First, the image display device 101 was manufactured under the same conditions except that the rocking was not performed in step S3. With respect to the image display devices with different swings, a test was performed in which a weight was suspended and weighted so as to peel off the protective plate 50 and the display panel 11 under a high temperature condition of 70 degrees. The weight was adjusted to be 100 grams / square centimeter.

  As a result, in the image display device 100 that has been swung, no bubbles are observed between the protective plate 50 and the display panel 11 even after the 24-hour test, and between the protective plate 50 and the adhesive member 30 and Peeling between the display panel 11 and the adhesive member 30 was not observed. On the other hand, in the image display device 101 that has not been swung, peeling occurred at the boundary between the display panel 11 and the adhesive member.

  In the image display device 101 that is not swinging, the angle at a position corresponding to the position where the corner 30B of the image display device 100 is located is an obtuse angle. Therefore, it is considered that the stress that peels between the protective plate 50 and the display panel 11 is concentrated on the end portion having the obtuse angle, and peeling occurs at the boundary between the display panel 11 and the adhesive member 30. When a stress force line of a force for peeling between the protective plate 50 and the display panel 11 applied to the adhesive member of the image display device 101 that is not swinging is drawn, the stress force line is concentrated on the end portion that is an obtuse angle. And the direction faces the inside of the adhesive member. Thereby, it is thought that the stress which peels off between the protection board 50 and the display panel 11 concentrates on the edge part which was an obtuse angle.

  On the other hand, in the image display device 100 according to the first exemplary embodiment of the present invention, the angles 30A and 30B are both 90 degrees or less. Therefore, since the end portion has a right angle or an acute angle, it is possible to reduce the stress that peels between the protective plate 50 and the display panel 11 from being concentrated on the end portion, and between the display panel 11 and the adhesive member 30. It is considered that the occurrence of peeling at the boundary between the protective plate 50 and the adhesive member 30 could be reduced.

  When a stress force line of a force for peeling between the protective plate 50 and the display panel 11 applied to the adhesive member 30 of the image display device 100 according to the first embodiment of the present invention is drawn, the first adhesive surface 30b and the second adhesive surface 30b are drawn. When the bonding surfaces 30a have the same area, there is no place where stress lines of force concentrate on the first bonding surface 30b and the second bonding surface 30a. When the areas of the first adhesive surface 30b and the second adhesive surface 30a are different, the stress line of force is concentrated at the end portion where the smaller adhesive surface is present. However, the direction of the stress line of force faces the outside of the adhesive member. Thereby, it can reduce that the stress which peels between the protection board 50 and the display panel 11 concentrates on an edge part, and it has been able to reduce that peeling arises in the boundary between the display panel 11 and the adhesion member 30. Conceivable. Here, it can be seen that the area of the first adhesive surface 30b and the area of the second adhesive surface 30a are most preferably the same.

  In Embodiment 1 of the present invention, the swinging direction in step S3 of the manufacturing method is the horizontal direction, but it may be the vertical direction. Similarly to the case of the horizontal direction, the display panel 11 may be swung up and down with a width of plus or minus 0.05 millimeters, that is, 0.1 millimeter in the vertical direction, with the contacted position being zero. The second adhesive surface 300a that has not been cured due to the inhibition of curing by oxygen becomes a shape that is crushed when the display panel 11 moves upward, and widens the area. Then, when moving downward, the angle 30B can be formed to be 90 degrees or less. At this time, the display panel 11 is swung, but the protection plate 50 may be swung, or both the protection plate 50 and the display panel 11 may be swung. By this swinging, the area of the second adhesive surface 300a may be expanded, and the angle 30B may be 90 degrees or less.

  A similar test in which a weight is applied to the image display device 102 manufactured with the swing direction in step S3 as the vertical direction is performed. As a result, as with the image display device 100, problems such as generation of bubbles and displacement were not confirmed. In addition, the image display device 103 in which the direction of swinging in step S3 was both horizontal and vertical was manufactured, and a similar test was performed in which weighting was performed using a weight. As a result, similarly to the image display apparatus 100, no problems such as generation of bubbles and displacement were confirmed.

  In the image display apparatus 100 according to the first embodiment of the present invention, the first panel is the protection plate 50 and the second panel is the display panel 11. However, the first panel is the protective plate 50, and the second panel may be a touch panel. The touch panel has a touch sensor formed of an electrode that detects an indicator touched on a base substrate and is sealed with a protective film or the like. Here, the method for sensing the touched indicator is not particularly limited, and may be a resistance film type or a capacitance type. Further, the first panel may be a touch panel and the second panel may be the display panel 11. When the first panel is a protection plate 50 and the second panel is a touch panel, the image display device 100 according to the first embodiment of the present invention further includes a display panel 11 as a third panel.

  Further, the image display device 104 was manufactured using the first panel as the protection plate 50 and the second panel as the touch panel. Further, the image display device 105 was manufactured under the same conditions except that the first panel was the protective plate 50 and the second panel was the touch panel and the rocking was not performed in step S3. With respect to the image display devices having different swings, a test was performed in which a weight was suspended and weighted so as to peel off between the protective plate 50 and the touch panel under a high temperature condition of 70 degrees. The weight was adjusted to be 100 grams / square centimeter.

  As a result, in the image display device 104 that has been oscillated, no bubbles are observed between the protective plate 50 and the touch panel even after the 24-hour test, and between the protective plate 50 and the adhesive member 30 and the touch panel. Peeling with the adhesive member 30 was not observed. On the other hand, in the image display device 105 that has not been swung, peeling occurred at the boundary between the touch panel and the adhesive member.

  Further, the image display device 106 was manufactured using the first panel as the touch panel and the second panel as the display panel 11. In addition, the first panel is a touch panel and the second panel is a display panel 11, and the image display device 107 is manufactured under the same conditions except that the swing is not performed in step S <b> 3. For the image display devices with different swinging presence / absence, a test was performed in which a weight was suspended and weighted in the same manner as described above.

As a result, in the image display device 106 that has been swung, no bubbles are observed between the touch panel and the display panel 11 even after the 24-hour test, and between the touch panel and the adhesive member 30 and between the display panel 11 and the display panel 11. Peeling with the adhesive member 30 was not observed. On the other hand, the image display device 107 is not performed swinging, peeling at the boundary between the display panel 11 the adhesive member had occurred.

  As described above, in Embodiment 1 of the present invention, peeling is performed between the first panel and the adhesive member and between the second panel and the adhesive member with a good yield by a simple manufacturing method. It is possible to provide an image display device capable of reducing the occurrence.

  In the manufacturing method of the image display apparatus 100 according to the first embodiment of the present invention, the adhesive part 300 and the second panel, which are obtained by printing the adhesive part 300 in a planar shape on the first panel and temporarily curing it, are used. Although it was made to contact, you may print the adhesive part 300 on a 2nd panel in planar shape, and may contact the adhesive part 300 and the 1st panel which were temporarily hardened. That is, in the manufacturing method, the first panel and the second panel may be interchanged.

Embodiment 2. FIG.
In the second embodiment of the present invention, portions that are different from the first embodiment of the present invention will be described, and descriptions of the same or corresponding portions will be omitted. The second embodiment of the present invention differs from the first embodiment of the present invention in that the display panel of the image display device includes a frame member and the method of forming the adhesive member of the image display device.

  FIG. 7 is an exploded perspective view showing the configuration of the image display apparatus 200 according to the second embodiment. FIG. 8 is a side view showing the configuration of the image display apparatus 200 according to the second embodiment. As shown in FIG. 7, the image display apparatus 200 according to the second embodiment of the present invention includes a frame member 70 in addition to the image display apparatus 100 according to the first embodiment of the present invention. The image display device 200 according to the second exemplary embodiment of the present invention is different from the first exemplary embodiment of the present invention in the formation method of the adhesive member. Therefore, in the image display device 200 according to the second exemplary embodiment of the present invention, the adhesive member is used. 330. As shown in FIG. 8, the adhesive member 330 is a combination of the first adhesive member 310 and the second adhesive member 320. The image display apparatus 200 according to the second embodiment of the present invention includes a protection plate 50 as a first panel, and a display panel 11 as a second panel bonded together through the protection plate 50 and an adhesive member 330. Is.

  The frame member 70 has an opening on the side where the image of the display panel 11 is visually recognized. The size of the opening is smaller than the polarizing member 20 attached to the display panel 11 and is an area surrounded by the opening end 72. The frame member 70 covers the periphery of the display panel 11. The frame member 70 is manufactured, for example, by die cutting or pressing using a plate such as stainless steel or zinc alloy. In addition, the frame member 70 may be made of resin. In addition, the material of the frame member 70, a manufacturing method, etc. are not specifically limited in Embodiment 2 of this invention.

  The frame member 70 is installed close to the display panel 11. That is, the polarizing member 20 and the opening end 72 of the frame member 70 are installed close to each other. The frame member 70 has a thickness of about 0.1 mm to 1.0 mm, and the liquid crystal substrate 10 is deformed by the opening end 72 coming into contact with the polarizing member 20 due to variations in processing accuracy and deformation after processing. There are things to do. For this reason, problems such as display unevenness and the like that degrade display quality may be caused. Generally, the frame member 70 including the opening end 72 is designed so as not to contact the polarizing member 20, and a gap is provided between the opening end 72 and the polarizing member 20.

  The image display apparatus 200 according to the second embodiment of the present invention has a thickness of 0.55 millimeters when the thickness of the frame member 70 and the gap between the opening end 72 and the polarizing member 20 are matched. For the purpose of improving strength and preventing leakage of the liquid and semi-cured adhesive part, the frame member 70 may be provided with protrusions or grooves, but is not particularly limited.

  Next, a method for manufacturing the image display apparatus 200 according to the second embodiment of the present invention will be described. First, the display panel 11 in which the polarizing member 20 is attached to the display surface 10 a of the liquid crystal substrate 10 is provided with the frame member 70. Further, a protective plate 50 having a printed layer 40 formed on the back surface 50b is prepared. Below, the manufacturing method of the image display apparatus 200 according to the second embodiment of the present invention is a process, and the process of bonding the prepared display panel 11 and the protection plate 50 via the adhesive member 330 will be described in detail. .

  Also in Embodiment 2 of the present invention, a radical polymerization type acrylic ultraviolet curable adhesive resin is used as the material of the adhesive part 31 and the adhesive part 32. FIG. 9 is a process flow diagram illustrating a method for manufacturing the image display apparatus 200 according to the second embodiment of the present invention, in which the prepared display panel 11 and the protection plate 50 are bonded together via the adhesive member 330. FIG. The image display apparatus 200 according to the second embodiment of the present invention includes steps S11 to S16 shown in FIG.

  First, a manufacturing method of the image display apparatus 200 according to the second embodiment of the present invention will be briefly described with reference to FIG. In step S <b> 11 of FIG. 9, the adhesive member 31 is printed on the back surface 50 b of the protection plate 50, and the adhesive member 32 is printed on the front surface 11 a of the display panel 11. Next, in step S12, temporary curing is performed to cure the positions of the printed adhesive part 31 and the peripheral part of the adhesive part 32, and in step S13, the surface of the adhesive part 31 that has been temporarily cured and the adhesive part. The display panel 11 is swung by contacting the surface of the agent 32. In step S14, the adhesive member 31 and the adhesive member 32 are pressed against the display panel 11, and in step S15, the protective plate 50 and the display panel 11 are slightly separated. Finally, in step S16, the adhesive part 31 and the adhesive part 32 are fully cured.

  Next, details of step S11 to step S16 shown in FIG. 9 will be described. Step S11 is a seventh step, which is a surface facing the display panel 11 of the protection plate 50 and printing the adhesive 31 on the back surface 50b of the protection plate 50 in a planar shape. The adhesive part 32 is printed in a planar shape on the surface 11 a of the display panel 11, which is a surface facing 50. FIG. 10 is a diagram for explaining a method for manufacturing the image display device 200 according to the second embodiment of the present invention, and is a diagram for explaining a seventh step. FIG. 10A is a diagram in which the adhesive agent 31 is printed in a planar shape on the back surface 50 b of the protection plate 50. FIG. 10B is a diagram in which the adhesive agent 32 is printed in a planar shape on the surface 11 a of the display panel 11. The adhesive part 31 becomes the first adhesive member 310 after the main curing, and the adhesive part 32 becomes the second adhesive member 320 after the main curing to form the adhesive member 330.

  As shown in FIG. 10A, the adhesive member 31 is a surface facing the display panel 11 of the protection plate 50 and is printed in a planar shape on the back surface 50 b of the protection plate 50. The surface bonded to the protective plate 50 of the adhesive member 31 is a first bonding surface 31b. The surface 31 a of the adhesive member 31 is then bonded to the adhesive member 32. As shown in FIG. 10B, the adhesive member 32 is a surface facing the protective plate 50 of the display panel 11 and is printed in a planar shape on the surface 11 a of the display panel 11. A surface of the adhesive member 32 that is bonded to the display panel 11 is a second bonding surface 32b. Thereafter, the surface 32 a of the adhesive member 32 is bonded to the adhesive member 31. The first adhesive surface 31b is a surface that becomes the first adhesive surface 310b when the adhesive member 31 becomes the first adhesive member 31 after the main curing. The second adhesive surface 32b is a surface that becomes the second adhesive surface 320b when the adhesive member 32 becomes the second adhesive member 320 after the main curing.

  Further, in FIG. 10A, the outer periphery of the first bonding surface 31 b is shown as a peripheral edge portion 311. Moreover, it is the 1st angle | corner which the side surface in the end point of the 1st adhesion surface 31b of the adhesion part agent 31 and the 1st adhesion surface 31b comprise, Comprising: The angle | corner in the adhesion part agent 31 is shown as the angle | corner 31A. . The corner 31 </ b> A is an angle formed by the adhesive surface of the adhesive member 31 with the protective plate 50 and the side surface of the adhesive member 31. In FIG. 10B, the outer periphery of the second adhesive surface 32 b is shown as the peripheral edge 321. Moreover, it is the 2nd angle | corner which the side surface in the end point of the 2nd adhesion surface 32b of the adhesion part agent 32 and the 2nd adhesion surface 32b comprise, Comprising: The angle | corner in the adhesion part agent 32 is shown as the angle | corner 32B. . The corner 32 </ b> B is an angle formed by the adhesive surface of the adhesive member 32 with the display panel 11 and the side surface of the adhesive member 32.

  Here, the adhesive part agent 31 and the adhesive part agent 32 were printed in a planar shape by a slit coat method. The printing method of the adhesive part 31 and the adhesive part 32 is not specifically limited. Another printing method that can print the adhesive part 31 and the adhesive part 32 in a planar shape is a screen printing method. The printing method and thickness can be changed as appropriate in accordance with other components.

  The adhesive member 31 was formed on the back surface 50b of the protective plate 50 substantially uniformly with a thickness of about 120 micrometers. The adhesive part 32 was formed substantially uniformly on the surface 11a of the display panel 11 with a thickness of about 580 micrometers. The thickness of the adhesive part agent 31 and the adhesive part agent 32 is not specifically limited, It can adjust suitably according to another structural member.

  Next, step S12 is an eighth step, and temporary curing is performed to cure the positions of the peripheral edge portion 311 of the adhesive part agent 31 and the peripheral edge part 321 of the adhesive part agent 32 printed in step S11. In the temporary curing of the adhesive member 31, the ultraviolet light is irradiated from the surface 31a side of the adhesive member 31 so as to obtain an integrated light amount of 0.3 Joule / square centimeter. In the temporary curing of the adhesive member 32, ultraviolet light is irradiated from the surface 32a side of the adhesive member 32 so as to obtain an integrated light amount of 0.3 Joule / square centimeter. Thereby, it is temporarily cured at a curing degree of 30% or more and 80% or less.

  The degree of cure of the temporary curing is appropriately determined depending on the material used for the pressure-sensitive adhesive member because the hardness of the pressure-sensitive adhesive agent 31 after temporary curing varies depending on the material. Further, it varies depending on the limitation of processing time, the size of the protective plate 50 and the display panel 11 to be bonded, and the like. Here, the degree of cure was 50% or more and 80% or less. In the second embodiment of the present invention, it is assumed that the size of the protection plate 50 and the display panel 11 is about 12 inches diagonal.

  The adhesive part 31 and the adhesive part 32 that have undergone step S12 are in a semi-cured state, and the fluidity such that the positions of the peripheral part 311 of the adhesive part 31 and the peripheral part 321 of the adhesive part 32 are changed. I don't have it. And in Embodiment 2 of this invention, since the radical polymerization type acrylic ultraviolet curing adhesive resin was used for the adhesive part 31 and the adhesive part 32, the surface 31a of the adhesive part 31 and the adhesive part 32 The surface 32a is not cured by being inhibited by oxygen. Therefore, the outermost surface of several micrometers is not cured.

  The adhesive part agent 31 is formed so as to cover the opening of the printed layer 40 formed on the back surface 50 b of the protective plate 50. That is, the peripheral edge portion 311 of the adhesive member 31 is in contact with the printed layer 40 formed in a closed loop shape. Regarding the cross-sectional shape of the end of the adhesive member 31, the peripheral edge 311 of the adhesive member 31 is closest to the outer peripheral part 501 of the protection plate 50. And it inclines in the direction which goes to the center of the adhesion part agent 31 between the peripheral part 311 of the adhesion part agent 31 and the surface 31a of the adhesion part agent 31. FIG. Therefore, the size of the adhesive part 31 when viewed from above is reduced as it approaches the surface 31a from the first adhesive surface 31b of the adhesive part 31.

  That is, the thickness of the adhesive part agent 31 becomes thinner as the outer peripheral part 501 of the protective plate 50 is approached. The angle of the corner 31A is 90 degrees or less. The cross-sectional shape of the adhesive part 31 becomes the above-described shape when the adhesive member is applied to the surface by a printing method such as a slit coat method, and the protective plate 50 or the printing layer 40 and the adhesive part 31 The adhesive part 31 in contact with the protective plate 50 wets and spreads, but does not contact the protective plate 50 in accordance with the contact angle formed by, i.e., the wettability of the adhesive part 31 with respect to the protective plate 50 and the printing layer 40. This is because 31 is drawn toward the center of the region applied by surface tension. In Embodiment 2 of the present invention, treatments generally known as wettability improvement treatments such as ozone treatment and plasma treatment are performed on the surface of the protective plate 50 and the adhesive layer 31 of the printing layer 40 to be applied. Not performed.

  Adhesive member 32 is substantially the same shape as opening end 72 of frame member 70 and is formed in the same or slightly larger size, and is formed in a slightly larger size in the second embodiment of the present invention. . The adhesive member 32 has a volume required by the opening of the frame member 70 defined by the opening end 72 and the thickness of the frame member 70 and the gap between the opening end 72 and the polarizing member 20. The size and thickness are adjusted so as to exceed. This is because when the volume is not exceeded, a gap is formed, which is visually recognized as a defect such as generation of bubbles or separation. Actually, the adhesive 31 is contracted at the time of curing, so it is slightly thinner than the time of printing, but it is not a big problem because it is within the range of film thickness variation.

  The cross-sectional shape of the end of the adhesive member 32 is inclined in the direction toward the center of the adhesive member 32 between the peripheral edge 321 of the adhesive member 32 and the surface 32 a of the adhesive member 32. Therefore, the size of the adhesive member 32 when viewed from above is reduced as it approaches the surface 32a from the second adhesive surface 32b of the adhesive member 32.

  The angle 32B is 90 degrees or less. The cross-sectional shape of the adhesive member 32 is as described above because the surface 11a of the display panel 11 and the adhesive member 32 are formed when the adhesive member is applied in a planar shape by a printing method such as a slit coat method. Depending on the contact angle formed, that is, the wettability of the adhesive part 32 to the surface 11a of the display panel 11, the adhesive part 31 in contact with the surface 11a of the display panel 11 spreads out, but it contacts the surface 11a of the display panel 11. This is because the adhesive member 32 not to be pulled is drawn toward the center of the region applied by surface tension.

  The adhesive part 32 is formed in a size smaller than the adhesive part 31. This is to prevent a gap from being generated between the frame member 70, the adhesive member 31 and the adhesive member 32 and being visually recognized as defects such as bubbles and peeling.

Then, Step S 1 3 a ninth step, the surface 31a of the adhesive portion adhesive 31 is temporarily cured, contacting the surface 32a of the adhesive portion adhesive 32 is temporarily cured. In a vacuum of about 100 Pascal, the surface 31a of the adhesive part 31 and the surface 32a of the adhesive part 32 are aligned and brought into contact with each other. Further, in this contacted state, the display panel 11 has a plus or minus 1 millimeter, that is, a width of 2 millimeters, with the position where the display panel 11 is brought into contact in the long side direction and the short side direction of the display panel 11 being zero. The long side and the short side of the plate are swung in the horizontal direction. As a result, the adhesive part 31 and the adhesive part 32 are securely bonded to form the adhesive part 33.

  FIG. 11 is a diagram for explaining the manufacturing method of the image display apparatus 200 according to the second embodiment of the present invention, and is a diagram for explaining the ninth step. FIG. 11 shows the image display device that has undergone the ninth step. FIG. 11 shows an adhesive member 33 in which the adhesive member 31 and the adhesive member 32 are securely bonded. In the temporary curing in step 12, the adhesive part agent 31 was able to determine the position of the peripheral edge part 311 so that the angle 31A was 90 degrees or less. Further, the adhesive agent 32 was also able to determine the position of the peripheral edge 321 in the temporary curing in Step 12, and to reduce the angle of the corner 32B to 90 degrees or less.

  Accordingly, when the adhesive member 33 is viewed in cross section, the first corner formed by the side surface at the end point of the first adhesive surface 31b and the first adhesive surface 31b and the side surface at the end point of the second adhesive surface 32b. And the second angle formed by the second adhesive surface 32b is 90 degrees or less.

  The alignment between the surface 31a of the adhesive member 31 and the surface 32a of the adhesive member 32 is performed before the surface 31a of the adhesive member 31 and the surface 32a of the adhesive member 32 are brought into contact with each other. In this state, the alignment is complete. Moreover, about the distance which the surface 31a of the adhesion part 31 and the surface 32a of the adhesion part 32 contact, it does not restrict | limit in particular, It adjusts suitably. Before contacting, the hardness of the adhesive part 31 and the adhesive part 32 differs depending on the distribution of the thickness of the adhesive part 31 and the adhesive part 32 and the degree of curing of the adhesive part 31 and the adhesive part 32. In view of this, it is considered preferable to calculate from the range of about 5% to 20% of the printing thickness of the adhesive part 31 and the adhesive part 32. Moreover, about the width | variety rock | fluctuated after a contact, it is the width | variety inclined between the peripheral part 311 of the adhesive part 31 and the surface 31a of the adhesive part 31, or the adhesive part agent from the peripheral part 321 of the adhesive part 32. The swing width is preferably smaller than the width inclined with respect to the surface 32a of 32, but is not particularly limited.

  Next, step S14 is an eleventh step, in which the adhesive member 33 is pressed against the display panel 11 with a pressure of about 1 megapascal. Since step S14 is performed subsequent to step S13, it is performed under a vacuum of about 100 Pascals. In step S14, the distortion of the protective plate 50 and the display panel 11 is corrected in order to remove air bubbles that have entered between the protective plate 50 and the display panel 11 so that the adhesive member 33 has a desired thickness. What you do to do. Although the pressing time may be changed or the pressure may be changed during the pressing, the pressing time, the pressing pressure value, and the conditions for changing the pressure value are not particularly limited. It is appropriately determined according to the performance of the apparatus to be used, the processing time limit, the size of the protective plate 50 and the display panel 11 to be bonded. However, the pressure which changes the cross-sectional shape of the adhesive part agent 33 is not applied.

  The degree of vacuum in step S13 and step S14 can also be appropriately determined according to the performance of the apparatus used, the limitation of processing time, the size of the protective plate 50 and the display panel 11 to be bonded, and the like. The vacuum bonding apparatus used in Embodiment 2 of the present invention was provided with a mechanism for adjusting the gap between the surface 31a of the adhesive member 31 and the surface 32a of the adhesive member 32 in units of micrometers. The display panel 11 and the protection plate 50 are fixed to the upper and lower stages by vacuum suction, but may be fixed by static electricity depending on the size and material of the protection plate 50 and the display panel 11 to be bonded.

  One or both of the upper and lower stages have a mechanism that is movable in micrometer units in all directions in the horizontal direction in the planar direction. Therefore, in step S13 in the second embodiment of the present invention, the surface 31a of the adhesive member 31 and the surface 32a of the adhesive member 32 are brought into contact with each other to swing the display panel 11, but the protective plate 50 is swung. Alternatively, both the protective plate 50 and the display panel 11 may be swung. It is only necessary that the adhesive member 31 and the adhesive member 32 be securely bonded by this swing.

  Next, step S15 is a twelfth step, and the protection plate 50 and the display panel 11 are slightly separated. Thereby, the angles of the corner 31A and the corner 32B can be surely made 90 degrees or less. The separation distance is not particularly limited, but it should be avoided that the adhesive member 33 is cracked and that the adhesive member 30 is peeled off from the protective plate 50 or the display panel 11. .

  Next, step S16 is a tenth step, and the adhesive member 33 is fully cured. That is, the adhesive part 31 and the adhesive part 32 are fully cured. Thereby, the adhesive part agent 31 becomes the first adhesive member 310, the adhesive part agent 32 becomes the second adhesive member 320, and the adhesive part agent 33 becomes the adhesive member 330. FIG. 12 is a diagram for explaining the manufacturing method of the image display apparatus 200 according to the second embodiment of the present invention, and is a diagram for explaining the tenth step. In the second embodiment of the present invention, the ultraviolet ray 60 is irradiated and cured so as to obtain an integrated light amount of 3 joules / square centimeter from the protective plate 50 side. Thereafter, the UV light 60 is further irradiated from the side surface of the adhesive member 33 by 3 joules / square centimeter, and the portion shielded from light by the printing layer 40 is also cured.

  In addition, about the ultraviolet light 60 irradiation from the side surface of the adhesion part agent 33, when the hardening degree of the temporary hardening in step S12 is high, even if there is the printing layer 40 at the time of the ultraviolet ray 60 irradiation from the protective plate 50 side, it will be hardened When the adhesive part 31 is used, it may not be carried out. Further, the order of irradiation with the ultraviolet light 60 from the side surface of the creeping adhesive member 30 and the subsequent irradiation with the ultraviolet light 60 from the protective plate 50 side may be changed.

  As described above, the image display apparatus 200 according to the second embodiment of the present invention is manufactured. The angles of the corner 31A and the corner 32B of the image display apparatus 200 according to the second embodiment of the present invention manufactured by the method described above were in the range of 10 degrees to 60 degrees.

  In the second embodiment of the present invention, both the adhesive part 31 and the adhesive part 32 are radical polymerization type acrylic ultraviolet curable adhesive resins. However, in the method for manufacturing the image display device 200 according to the second embodiment of the present invention, when the adhesive part 31 or the adhesive part 32 is temporarily cured in step S31, the outermost surface exposed to the outside air is the surface. Any material that does not harden may be used. That is, in the method for manufacturing the image display device 200 according to the second embodiment of the present invention, when the adhesive part 31 or the adhesive part 32 is temporarily cured in step S31, the outermost surface exposed to the outside air is cured. The material to be used may be used.

  The effects of the image display device 200 according to the second embodiment of the present invention will be described below. First, the image display device 201 was manufactured under the same conditions except that the rocking was not performed in step S13. With respect to the image display devices with different swings, a test was performed in which a weight was suspended and weighted so as to peel off the protective plate 50 and the display panel 11 under a high temperature condition of 70 degrees. The weight was adjusted to be 100 grams / square centimeter.

  As a result, in the image display device 200 that has been swung, no bubbles are observed between the protective plate 50 and the display panel 11 even after the 24-hour test, and between the protective plate 50 and the adhesive member 30 and Peeling between the display panel 11 and the adhesive member 330 was not observed. On the other hand, the image display device 201 that is not swinging is peeled off at the boundary between the first adhesive member and the second adhesive member in the adhesive member. Peeling occurred at the boundary between the display panel 11 and the adhesive member.

  In the image display device 200 according to the second embodiment of the present invention, the angles of the corners 31A and 32B are both 90 degrees or less. Therefore, since the end portion has a right angle or an acute angle, it is possible to reduce the stress that peels between the protective plate 50 and the display panel 11 from being concentrated on the end portion, and between the display panel 11 and the adhesive member 330, The occurrence of peeling at the boundary between the protective plate 50 and the adhesive member 330 can be reduced. In addition to this, the adhesive member 31 and the adhesive member 32 can be securely bonded by swinging in step S13, and the boundary between the first adhesive member 310 and the second adhesive member 320 is obtained. This prevented the peeling from occurring.

  In Embodiment 1 of the present invention, the swinging direction in Step S13 is the horizontal direction, but it may be the vertical direction. Similarly to the case of the horizontal direction, the display panel 11 may be swung up and down with a width of plus or minus 0.05 millimeters, that is, 0.1 millimeter in the vertical direction, with the contacted position being zero. Thereby, the adhesive part agent 31 and the adhesive part agent 32 can be adhere | attached reliably. At this time, the display panel 11 is swung, but the protection plate 50 may be swung, or both the protection plate 50 and the display panel 11 may be swung. It is only necessary that the adhesive member 31 and the adhesive member 32 can be securely bonded by this swing.

  A similar test was performed in which weight was applied to the image display device 202 manufactured in step S13 with the swinging direction set as the vertical direction. As a result, as with the image display apparatus 200, problems such as generation of bubbles and displacement were not confirmed. Further, a similar test was performed in which the image display device 203 in which the swing direction in step S13 was both horizontal and vertical was manufactured and weighted with a weight. As a result, similarly to the image display apparatus 200, problems such as generation of bubbles and displacement were not confirmed.

  In the image display apparatus 200 according to the second embodiment of the present invention, the first panel and the second panel are sequentially stacked from the side where the image is displayed and the side where the external light hits, and the first panel is protected. The plate 50 was used, and the second panel was used as the display panel 11. However, the first panel is the protective plate 50, and the second panel may be a touch panel. The touch panel has a touch sensor formed of an electrode that detects an indicator touched on a base substrate and is sealed with a protective film or the like. Here, the method for sensing the touched indicator is not particularly limited, and may be a resistance film type or a capacitance type. Further, the first panel may be a touch panel and the second panel may be the display panel 11. When the protection panel 50 is used as the first panel and the touch panel is used as the second panel, the image display device 200 according to the second embodiment of the present invention further includes the display panel 11 as a third panel.

Further, the image display device 204 was manufactured using the first panel as the protective plate 50 and the second panel as the touch panel. The protective plate 50 of the first panel, the second panel as a touch panel, is not allowed to swing in step S 1 3, the other is to produce a picture display device 205 in the same conditions. With respect to the image display devices having different swings, a test was performed in which a weight was suspended and weighted so as to peel off between the protective plate 50 and the touch panel under a high temperature condition of 70 degrees. The weight was adjusted to be 100 grams / square centimeter.

  As a result, in the image display device 204 that has been oscillated, no bubbles are observed between the protective plate 50 and the touch panel even after the 24-hour test, and between the protective plate 50 and the adhesive member 330 and the touch panel. No peeling between the adhesive member 330 was observed. On the other hand, the image display device 205 not swinging is peeled off at the boundary between the first adhesive member and the second adhesive member in the adhesive member.

Further, the image display device 206 was manufactured using the first panel as the touch panel and the second panel as the display panel 11. Further, the first panel was used as the touch panel and the second panel was used as the display panel 11, and the image display device 207 was manufactured under the same conditions except that the swing in Step S 13 was not performed. For the image display devices with different swinging presence / absence, a test was performed in which a weight was suspended and weighted in the same manner as described above.

  As a result, in the image display device 206 that has been swung, no bubbles are observed between the touch panel and the display panel 11 even after the 24-hour test. No peeling between the adhesive member 330 was observed. On the other hand, the image display device 207 that is not swinging is peeled off at the boundary between the first adhesive member and the second adhesive member in the adhesive member.

  As described above, in Embodiment 2 of the present invention, peeling is performed between the first panel and the adhesive member and between the second panel and the adhesive member with a good yield by a simple manufacturing method. It is possible to provide an image display device capable of reducing the occurrence.

  Note that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted. The dimensions, materials, shapes, relative arrangements, and the like of each component exemplified in each embodiment are appropriately changed according to the configuration of the apparatus to which the present invention is applied and various conditions. However, the present invention is not limited to these examples. Moreover, the dimension of each component in each figure may differ from an actual dimension.

  DESCRIPTION OF SYMBOLS 10 Liquid crystal substrate, 10a Display surface, 11 Display panel, 11a Display panel surface, 20 Polarizing member, 30, 34 Adhesive member, 31, 32, 33, 300 Adhesive part, 30A, 30B, 31A, 32B Square, 32b, 300a, 320b 2nd adhesion surface, 31b, 300b, 310b 1st adhesion surface, 40 printing layer, 42, 72 opening edge part, 50 protection plate, 50a surface of protection plate, 50b back surface of protection plate, 70 frame member , 100, 200 Image display device, 301, 311, 321 Peripheral part, 310 First adhesive member, 320 Second adhesive member, 501 Peripheral part.

Claims (10)

A first panel;
A second panel bonded to the first panel via an adhesive member;
With
When the adhesive member is viewed in cross section , a first corner formed by an end point of the first adhesive surface, and a first corner that is a first adhesive surface and a side surface that are adhesive surfaces with the first panel, and the second Any angle of the second angle formed by the end point of the second adhesive surface and the second adhesive surface and the side surface, which is the adhesive surface with the panel, is in the range of 10 degrees to 60 degrees;
An image display device characterized by the above. The area of the first adhesive surface and the area of the second adhesive surface are the same;
The image display apparatus according to claim 1. The side surface of the adhesive member is a curved surface;
The image display device according to claim 1, wherein: The second panel is a display panel for displaying an image;
The first panel is a protective plate for protecting the second panel;
The image display device according to any one of claims 1 to 3, wherein The second panel is a display panel for displaying an image;
The first panel is a touch panel for sensing a touched indicator;
The image display device according to any one of claims 1 to 3, wherein The second panel is a touch panel for sensing a touched indicator;
The first panel is a protective plate for protecting the second panel;
The image display device according to any one of claims 1 to 3, wherein A method for manufacturing an image display device, comprising: a first panel; and a second panel bonded to the first panel via an adhesive member,
On the surface of the first panel that faces the second panel, a first step of printing a pressure-sensitive adhesive agent that becomes an adhesive member after curing in a planar shape;
A second step of performing temporary curing for curing to determine the position of the peripheral portion of the adhesive agent printed in the first step;
The surface of the adhesive member that has been temporarily cured in the second step is brought into contact with the surface of the second panel that faces the first panel, and either the first panel or the second panel is contacted. Or a third step of swinging both the first panel and the second panel;
After the third step, a sixth step of separating the first panel and the second panel;
A fourth step of fully curing the adhesive part that has undergone the sixth step to form the adhesive member;
A method for manufacturing an image display device, comprising: A fifth step of pressing the adhesive agent between the third step and the sixth step;
A method for manufacturing an image display device according to claim 7. A method for manufacturing an image display device, comprising: a first panel; and a second panel bonded to the first panel via an adhesive member,
Adhesive agents that become adhesive members after curing on the surface of the first panel that faces the second panel and the surface of the second panel that faces the first panel, respectively. A seventh step of printing on
An eighth step of performing temporary curing for curing to determine the position of the peripheral portion of the adhesive agent printed in the seventh step;
The surface of the adhesive member of the first panel temporarily cured in the eighth step is brought into contact with the surface of the adhesive member of the second panel, and the first panel or the second panel. Or a ninth step of swinging both the first panel and the second panel;
A twelfth step of separating the first panel and the second panel after the ninth step;
A tenth step of permanently curing the adhesive member that has undergone the twelfth step to form the adhesive member;
A method for manufacturing an image display device, comprising: An eleventh step of pressing the adhesive agent between the ninth step and the twelfth step;
The method for manufacturing an image display device according to claim 9.

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