JP5509837B2 - Method for joining plate-like parts and joining member - Google Patents

Description

  The present invention relates to a method for joining plate-like components and a joining member.

  For example, as a display device in which a display panel protection plate is arranged on the front side (observation side) of the display panel, there is one in which the display panel and the display panel protection plate are bonded together by a sheet-like joining member such as a double-sided adhesive sheet ( Patent Document 1).

JP 2008-90053 A

  However, when the display panel and the display panel protection plate are bonded together by a sheet-like joining member, a predetermined portion of the bonding surface of the protection plate to the display panel, for example, a portion corresponding to an area outside the screen area of the display panel In addition, when a protruding layer having a thickness such as a printed layer is formed, the portion of the joining member that overlaps the protruding layer is crushed and generates stress, causing peeling or the like in the bonded portion become.

  This is not limited to the joining of the display panel and the protective plate, but the first plate-like component and the second plate-like component in which the protruding layer is formed at a predetermined portion of the affixing surface to the first plate-like component. It can be said also when pasting together with a sheet-like joining member.

  According to the present invention, the protrusion of the sheet-like joining member for bonding the first plate-like component and the second plate-like component having a protrusion layer formed on a predetermined portion of the attachment surface for the first plate-like component. Provided is a method for joining plate-like components capable of bonding the first plate-like component and the second plate-like component while reducing stress generated in a portion overlapping the layer, and the sheet-like joining member therefor. It is for the purpose.

According to the first aspect of the present invention, the first plate-like component and the second plate-like component in which the protruding layer is formed at a predetermined portion of the affixing surface to the first plate-like component are formed by a sheet-like joining member. A method of bonding and joining,
A first component preparation step of preparing the first plate-shaped component;
A second component preparation step of preparing the second plate-shaped component on which the protruding layer is formed;
Formed in a shape that is sandwiched between the first plate-like component and the second plate-like component in a state where it overlaps with a part of the protruding layer, and over the entire area overlapping the protruding layer, A joining member preparation step of preparing a sheet-like joining member in which a stress relaxation portion in which an overlapping portion is partially lost and the contact area with the protruding layer is reduced is formed;
A bonding member bonding step for positioning and bonding the sheet-shaped bonding member to the second plate-shaped component so that the stress relaxation portion overlaps the protruding layer;
The first plate-like component and the second plate-like component are overlapped and pressed through the sheet-like joining member, and the first plate-like component and the second plate-like component are put into the sheet-like shape. Component bonding process to be bonded by the joining member;
It is characterized by including.

According to a second aspect of the present invention, the first plate-like component and the second plate-like component in which the protruding layer is formed at a predetermined portion of the affixing surface to the first plate-like component are formed by a sheet-like joining member. A method of bonding and joining,
A first component preparation step of preparing the first plate-shaped component;
A second component preparation step of preparing the second plate-shaped component on which the protruding layer is formed;
Formed in a shape that is sandwiched between the first plate-like component and the second plate-like component in a state where it overlaps with a part of the protruding layer, and over the entire area overlapping the protruding layer, A joining member preparation step of preparing a sheet-like joining member in which a stress relaxation portion in which an overlapping portion is partially lost and the contact area with the protruding layer is reduced is formed;
A joining member attaching step of attaching the sheet-like joining member to the first plate-like component;
The first plate-like component and the second plate-like component are positioned so that the stress relieving portion overlaps the protruding layer, and the first plate-like component and the second plate-like component are overlapped and pressurized via the sheet-like joining member, Component laminating step of laminating the plate-shaped component and the second plate-shaped component with the sheet-shaped joining member
It is characterized by including.

According to a third aspect of the present invention, in the method for joining plate-like components according to the first or second aspect, the second plate-like component having a frame-shaped protruding layer formed on the first peripheral edge is prepared. In the joining member preparing step, the second peripheral edge portion is formed in a shape overlapping with at least the inner peripheral edge of the protruding layer, and the stress is applied to the second peripheral edge portion over the entire area overlapping with the protruding layer. A sheet-like joining member in which a relaxation portion is formed is prepared.

  According to a fourth aspect of the present invention, in the method for joining plate-shaped components according to any of the first to third aspects, the component laminating step is performed under vacuum pressure.

  The invention according to claim 5 is the method for joining plate-like components according to any one of claims 1 to 4, wherein after the component laminating step, the first plate-like component and the second plate-like shape. The method further includes an autoclave step of performing an autoclave that applies heat and pressure to the component for a certain period of time.

The invention described in claim 6 is the method of bonding the plate-like component according to claim 5, wherein in the joining member preparing step, the peripheral portion over the entire width of the portion from the outer peripheral edge thereof overlaps with the protruding layer A sheet-like joining member in which a stress relaxation portion in which a plurality of cutout portions having a shape are formed at a predetermined pitch is prepared.

The invention described in claim 7 is the method of bonding the plate-like component according to claim 5, wherein in the joining member preparing step, the peripheral portion over the entire width of the portion of the outer peripheral edge thereof overlaps with the protruding layer A sheet-like joining member having a stress relaxation portion formed in a wave shape having an amplitude is prepared.

The invention according to claim 8 is the method for joining plate-like parts according to claim 5 , wherein in the joining member preparing step, a plurality of through holes are provided in a portion overlapping the protruding layer of the peripheral edge. A sheet-like joining member in which stress relaxation portions provided at a pitch are formed is prepared.

The invention according to claim 9 is a sheet for laminating the first plate-shaped component and the second plate-shaped component in which a protruding layer is formed on a predetermined portion of the bonding surface for the first plate-shaped component. A planar joining member that is sandwiched between the first plate-like component and the second plate-like component so as to overlap with a part of the projecting layer; and It is characterized by comprising a sheet member in which a stress relieving portion is formed over the entire overlapping portion by partially removing the overlapping portion to reduce the contact area with the protruding layer.

  According to this invention, the sheet-like joining member for laminating the first plate-like component and the second plate-like component having a protruding layer formed on a predetermined portion of the affixing surface to the first plate-like component. The first plate-like component and the second plate-like component can be bonded together while reducing the stress generated in the portion overlapping the protruding layer.

The perspective view of the 1st and 2nd plate-shaped components in 1st Example, and a sheet-like joining member. Sectional drawing of the display apparatus manufactured by the component joining method of 1st Example. The top view which shows the positional relationship of the protrusion layer formed in the 2nd plate-shaped component in the said display apparatus, and a sheet-like joining member. The top view of the state before use of the said sheet-like joining member. Sectional drawing of the state before use of the said sheet-like joining member. The joining process figure of the plate-shaped components by 1st Example. The top view which shows the air pocket produced between the 1st and 2nd plate-shaped components and the sheet-like joining member in the said joining process. The top view which shows the 1st modification of the said sheet-like joining member. The top view which shows the 2nd modification of the said sheet-like joining member. The top view which shows the 3rd modification of the said sheet-like joining member. The top view which shows the 4th modification of the said sheet-like joining member. Sectional drawing of the touch input device manufactured by the component joining method of 2nd Example. Sectional drawing of the display panel manufactured by the component joining method of 3rd Example.

[Example 1]
First, the display device shown in FIG. 2 will be described. This display device is bonded to the display panel 10 on the front side (observation side) of the display panel 10 by the transparent sheet-like bonding member 40. And a transparent display panel protection plate 30 arranged.

  In this embodiment, the display panel 10 is a liquid crystal display panel, and as shown in FIGS. 1 and 2, a display panel main body 11 in which a liquid crystal layer 15 is provided between two transparent substrates 12 and 13 arranged to face each other. And the front optical film 16 and the rear optical film 17 respectively attached to the outer surfaces of the substrates 12 and 13 of the display panel body 11.

  The display panel body 11 is an active type having a TFT (thin film transistor) as an active element, and is omitted in the figure, but one of the two transparent substrates 12 and 13, for example, A plurality of pixel electrodes arranged in a row direction and a column direction on a surface facing the liquid crystal layer 15 of the rear substrate 13, a plurality of TFTs arranged corresponding to these pixel electrodes, and a plurality of TFTs in each row A plurality of scanning lines for supplying gate signals to the TFTs and a plurality of data lines for supplying data signals to the plurality of TFTs in each column are provided, and the other substrate, that is, the surface facing the liquid crystal layer 15 of the front substrate 12 In addition, a single-film common electrode facing the plurality of pixel electrodes is provided.

  Further, on the surface of the other substrate 13 facing the liquid crystal layer 15, three pixels of red, green, and blue are respectively associated with a plurality of pixels composed of regions where the plurality of pixel electrodes and the common electrode are opposed to each other. A color filter for color is provided. The common electrode is formed on the surface of the color filter on the liquid crystal layer 15 side.

  The two substrates 12 and 13 are joined together via a frame-shaped sealing material 14 surrounding a screen area 11a composed of an array region of the plurality of pixels. A liquid crystal layer 15 is provided in a region surrounded by the sealing material 14.

  The display panel body 11 is, for example, a TN (twisted nematic) type, and the liquid crystal molecules of the liquid crystal layer 15 are provided on the substrates 12 and 13 so as to cover the pixel electrodes and the common electrode, respectively. Thus, the orientation directions on the surfaces of the substrates 12 and 13 are defined, and the substrates 12 and 13 are twist-oriented with a twist angle of approximately 90.

  Further, the front optical film 16 and the rear optical film 17 are polarizing plates, respectively, and these polarizing plates 16 and 17 are arranged with their absorption axes orthogonal to each other or parallel to each other.

  Further, as shown in FIG. 2, a surface light source 20 that irradiates light toward the screen area 11 a of the liquid crystal display panel 10 is disposed on the rear side of the liquid crystal display panel 10. Although the surface light source 20 is simplified in the figure, the surface light source 20 is formed with an incident end face that makes light incident on one end face thereof, and the incident light is incident on one of the two plate faces from the incident end face. An exit surface is formed, and a light guide plate having a reflection surface for reflecting light incident on the other plate surface from the incident end surface toward the exit surface, and an incident end surface of the light guide plate are disposed opposite to each other. And a plurality of light emitting elements such as LEDs (light emitting diodes). The surface light source 20 is disposed with the light exit surface of the light guide plate facing the rear surface of the liquid crystal display panel 10.

  On the other hand, the display panel protection plate 30 is made of tempered glass or hard resin, and a projecting layer 31 made of a printing layer or the like is formed at a predetermined portion of the affixing surface to the liquid crystal display panel 10. In this embodiment, the protruding layer 31 is a colored layer of an arbitrary color, and is formed in a frame shape surrounding the screen area 11 a outside the region facing the screen area 11 a of the liquid crystal display panel 10. .

  The display panel protection plate 30 is formed in a rectangular shape having an area that is somewhat larger than the area of the front surface of the liquid crystal display panel 10, and the protruding layer 31 is located at a position facing the periphery of the screen area 10a. To the outer peripheral edge of the display panel protection plate 30.

  Further, the sheet-like joining member 40 for bonding the liquid crystal display panel 10 and the display panel protection plate 30 is made of a transparent sheet member having flexibility and compressibility. The sheet-like joining member 40 of this embodiment is a double-sided pressure-sensitive adhesive sheet.

  The sheet-like bonding member 40 shown in the figure is a double-sided pressure-sensitive adhesive sheet obtained by forming a pressure-sensitive adhesive into a sheet shape, but the sheet-like bonding member 40 is a double-sided pressure-sensitive adhesive in which a pressure-sensitive adhesive layer is provided on each side of the base film. It may be a sheet.

  The sheet-like joining member 40 is formed in a planar shape that is sandwiched between the liquid crystal display panel 10 and the display panel protection plate 30 so as to overlap a part of the protruding layer 31. In this embodiment, the sheet-like joining member 40 has an outer shape smaller than that of the front surface of the liquid crystal display panel 10, and a peripheral portion of the sheet-like joining member 40 is formed in the protruding layer 31 formed on the display panel protection plate 30. It is formed in a shape that overlaps with the peripheral edge.

  And in the peripheral part of the said protrusion layer 31 of the said sheet-like joining member 40, as shown in FIGS. 1-3, the overlap part is partially lost over substantially the whole region of the part which overlaps with the said protrusion layer 31. A stress relaxation portion 41 having a reduced contact area with the protruding layer 31 is formed. At this time, the sheet-like joining member 40 is viewed so that the area of the sheet-like joining member 40 viewed from the display panel protection plate 30 side is smaller than the area of the region surrounded by the minimum closed curve surrounding the entire sheet-like joining member 40. The stress relaxation part 41 which made the contact area with the protrusion layer 31 small is formed by partially missing the overlapping part with the protrusion layer 31 of 40.

  The stress relaxation part 41 of the sheet-like joining member 40 of this embodiment forms a plurality of notches 42 with a predetermined pitch extending from the outer peripheral edge of the sheet-like joining member 40 to the substantially entire width of the portion overlapping the protruding layer 31. It consists of uneven edges.

  The plurality of notches 42 are desirably formed at a pitch as small as possible, preferably 5 mm or less, more preferably 2 to 3 mm or less.

  In this embodiment, a stress relaxation portion 41 provided with a plurality of trapezoidal cutout portions 42 on the sheet-like joining member 40 at a pitch that forms a triangular cutout portion 43 between adjacent cutout portions 42, 42 is formed. doing.

  The sheet-like joining member 40 made of the double-sided pressure-sensitive adhesive sheet has its both sides protected by separators (release paper) 45a and 45b as shown in FIGS. 4 and 5, and protects the liquid crystal display panel 10 and the display panel. When the plate 30 is bonded, the separators 45a and 45b are peeled off and used.

  In the production of the display device, the liquid crystal display panel 10 and the display panel protection plate 30 on which the protruding layer 31 is formed are bonded to a first component preparing step, a second component preparing step, and a joining member preparing step. The following joining method includes a joining member pasting step, a component pasting step, and an autoclave step performed after the component pasting step.

(First part preparation process)
The liquid crystal display panel 10 is prepared as a first plate-like component.

(Second part preparation process)
As the second plate-like component, the display panel protection plate 30 in which the protruding layer 31 is formed outside the region facing the screen area 11a of the liquid crystal display panel 10 is prepared.

(Jointing member preparation process)
The sheet-like joining member 40 is prepared, which is made of the double-sided pressure-sensitive adhesive sheet and in which the stress relieving part 41 is formed in a portion of the peripheral part that overlaps the protruding layer 31 of the display panel protection plate 30.

(Jointing member pasting process)
The sheet-like joining member 40 is positioned and pasted on the display panel protection plate 30 such that the stress relieving part 41 overlaps the protruding layer 31.

  In this embodiment, as shown in FIG. 6 (a), the display panel protection plate 30 on which the protruding layer 31 is formed is attached to the liquid crystal display panel 10 on the attachment surface (the surface on which the protruding layer 31 is formed). One surface of the sheet-like joining member 40 is peeled off and separated from the separator 45a on the one surface side, and the sheet-like joining member 40 is pressed against the sticking surface and the protruding layer 31 of the display panel protection plate 30. Thus, as shown in FIG. 6B, the sheet-like joining member 40 is attached to the sticking surface of the display panel protection plate 30 so as to overlap the protruding layer 31 on the stress relaxation portion 41.

  In the bonding member attaching step, since the sheet-like bonding member 40 is flexible, the peripheral edge portion of the sheet-like bonding member 40 is bent in accordance with the thickness of the protruding layer 31, and the display panel protection plate 30. It can affix in the state contact | abutted on both on the board surface and the said protrusion layer 31. FIG.

(Parts bonding process)
Next, the separator 45b on the other surface side of the sheet-like joining member 40 is peeled off, and the liquid crystal display panel 10 and the display panel protection plate 30 are joined to the sheet-like joining member 40 as shown in FIG. Then, the liquid crystal display panel 10 and the display panel protection plate 30 are bonded together by the sheet-like joining member 40 as shown in FIG. In this embodiment, the liquid crystal display panel 10 and the display panel protection plate 30 are bonded by the sheet-like joining member 40 under a vacuum pressure using a vacuum chamber or the like (not shown). Here, it is preferable to perform evacuation to about 30 Pa (2.961 × 10 ⁻⁴ atm) or less as a vacuum. However, it is not always necessary to evacuate to 30 Pa or less as long as the occurrence of the air intervening portion can be suppressed.

  Thus, when the liquid crystal display panel 10 and the display panel protection plate 30 are stacked and pressed through the sheet-like bonding member 40, the peripheral portion of the sheet-like bonding member 40 that is overlapped with the protruding layer 31 is formed. By being crushed, the sheet-like joining member 40 is in close contact with the liquid crystal display panel 10 and the display panel protection plate 30 over the entire area, and the liquid crystal display panel 10 and the display panel protection plate 30 are attached by the sheet-like joining member 40. Pasted together.

  In this component laminating step, the sheet-like joining member 40 is crushed at the peripheral edge overlapped with the protruding layer 31, so that stress is generated in the crushed portion of the sheet-like joining member 40.

  However, as described above, the portion of the sheet-like bonding member 40 that overlaps the protruding layer 31 has a plurality of depths that extend from the outer peripheral edge of the sheet-like bonding member 40 to substantially the entire width of the portion that overlaps the protruding layer 31. Since the stress relief portion 41 is formed of the uneven edge portion having the notch portion 42 formed at a predetermined pitch all around the peripheral edge portion, the stress generated in the crushed portion of the sheet-like joining member 40 is reduced. can do.

  That is, the magnitude of the stress generated in the crushed portion of the sheet-like joining member 40 is substantially proportional to the area of the crushed portion. Since the sheet-like bonding member 40 is formed by forming the stress relaxation portion 41 including the uneven edge portion in the portion overlapping the protruding layer 31, the area of the portion that is overlapped with the protruding layer 31 is The area of each uncut portion 43 between the plurality of cutout portions 42 of the stress relaxation portion 41 is substantially the same. Therefore, the stress generated in the crushed portion of the sheet-like bonding member 40 is the stress generated in the sheet-like bonding member in which the edge of each side is formed on the straight edge without the plurality of notches 42, respectively. It can be made smaller.

  Therefore, the liquid crystal display panel 10 and the display panel protection plate 30 on which the protruding layer 31 is formed are pasted without causing a large stress on the portion of the sheet-like joining member 40 that overlaps the protruding layer 31. Can be matched.

  In the joining member pasting step, the sheet-like joining member 40 is pasted from the surface of the display panel protection plate 30 to the protruding layer 31 by bending its peripheral edge as shown in FIG. However, at that time, air may be trapped in the step portion between the plate surface of the display panel protection plate 30 and the inner peripheral edge of the protruding layer 31.

  Moreover, in the said component bonding process, the said liquid crystal display panel 10 is the other surface of the said sheet-like joining member 40 affixed on the said display panel protection board 30 like FIG.6 (c). At this time, air is confined in the gap between the liquid crystal display panel 10 and the portion surrounded by the peripheral edge of the sheet-like joining member 40 that overlaps the protruding layer 31. In the above embodiment, the liquid crystal display panel 10 and the display panel protection plate 30 are bonded together under a vacuum pressure. However, a certain amount of air is confined even when the bonding is performed under a vacuum pressure.

  Most of the air trapped between the display panel protection plate 30 and the liquid crystal display panel 10 and the sheet-like joining member 40 is a portion along the inner periphery of the protruding layer 31 (see FIG. 7). The air reservoir A is formed by gathering at the portion with the parallel diagonal lines.

  When the air reservoir A is formed, the adhesion between the display panel protection plate 30 and the sheet-like joining member 40 and the adhesion between the liquid crystal display panel 10 and the sheet-like joining member 40 are weakened. Further, if there is the air reservoir A, the light transmitted through the portion is refracted or scattered, so that the display quality of the display device is deteriorated.

(Autoclave process)
Therefore, in this embodiment, an autoclave for applying heat and pressure to the bonded liquid crystal display panel 10 and the display panel protection plate 30 for a certain period of time is performed, and in the bonding member bonding step and the component bonding step, Air trapped between the display panel protection plate 30 and the liquid crystal display panel 10 and the sheet-like joining member 40 is melted into the sheet-like joining member 40 to eliminate the air reservoir A.

  As described above, the bonding method includes a sheet in which the liquid crystal display panel 10 and the display panel protection plate 30 on which the protruding layer 31 is formed are formed with the stress relaxation portion 41 in a portion overlapping the protruding layer 31. The liquid crystal display panel 10 and the display panel protection plate 30 are bonded together without causing a large stress on the portion of the sheet-like bonding member 40 that overlaps the protruding layer 31. Therefore, it is possible to suppress the occurrence of peeling or the like due to the stress at the bonding portion between the liquid crystal display panel 10 and the display panel protection plate 30.

  In addition, the stress relaxation portion 41 of the sheet-like joining member 40 is formed with a plurality of notches 42 at a predetermined pitch extending from the outer periphery of the sheet-like joining member 40 to substantially the entire width of the portion overlapping the protruding layer 31. Since it is composed of uneven edges, the liquid crystal display panel 10 and the display panel protection plate 30 are also formed in the stress relaxation portion 41 of the sheet-like joining member 40 by the uncut portions 43 between the plurality of cutout portions 42. Can be bonded with sufficient strength.

  Moreover, since the said joining method is performing the said autoclave after bonding the said liquid crystal display panel 10 and the display panel protection board 30, the said display panel protection board 30, the liquid crystal display panel 10, and the said sheet-like joining member 40. When the air is trapped between the liquid crystal display panel 10 and the display panel protection plate 30, the trapped air is melted into the sheet-like bonding member 40, and the bonding strength between the liquid crystal display panel 10 and the display panel protection plate 30 is determined. It is possible to obtain a display device with high display quality by maintaining high throughout the bonding region by the joint member 40 and eliminating refraction and scattering of transmitted light by the air reservoir A.

  Note that the display panel protection plate 30 in the first embodiment has an area that is somewhat larger than the area of the front surface of the liquid crystal display panel 10. It may have the same area as that of the front surface.

  In addition, the sheet-like joining member 40 has a shape in which a peripheral portion thereof overlaps substantially the entire width of the protruding layer 31 formed on the display panel protection plate 30, and a portion overlapping the protruding layer 31 of the peripheral portion. Alternatively, the stress relaxation portion 41 may be formed.

  Further, the display panel protection plate 30 according to the first embodiment has a stress composed of a concavo-convex edge formed by forming a plurality of notches 42 at a predetermined pitch extending from the outer periphery of the display panel protection plate 30 to substantially the entire width of the portion overlapping the protruding layer 31. Although the relaxation portion 41 is formed, the stress relaxation portion may have other shapes as long as the contact area with the protruding layer 31 is reduced by partially removing the overlapping portion with the protruding layer 31. You may form in a shape.

  Furthermore, in the joining member attaching step, the sheet-like joining member 40 is positioned and attached to the display panel protection plate 30 so that the stress relaxation portion 41 overlaps the protruding layer 31. The sheet-like joining member 40 may be pasted on. In this case, in the component laminating step, the liquid crystal display panel 10 and the display panel protection plate 30 are positioned so that the stress relieving part 41 overlaps the protruding layer 31 and the sheet-like joining member 40 is interposed therebetween. The liquid crystal display panel 10 and the display panel protection plate 30 may be bonded together by the sheet-like bonding member 40.

  The sheet-like joining member 40a of the first modified example shown in FIG. 8 has an amplitude over substantially the entire width of the portion where the outer peripheral edge of the sheet member made of the double-sided pressure-sensitive adhesive sheet overlaps the protruding layer 31 formed on the display panel protection plate 30. The stress relaxation part 41a which consists of a wave-like edge part formed in the triangular wave shape with is formed.

  The sheet-like joining member 40b of the second modification shown in FIG. 9 has an amplitude over the substantially entire width of a portion where the outer peripheral edge of the sheet member made of the double-sided pressure-sensitive adhesive sheet overlaps the protruding layer 31 formed on the display panel protection plate 30. The stress relaxation part 41b which consists of a wavy edge formed in the rectangular wave shape with is formed.

  The sheet-like joining member 40c of the third modified example shown in FIG. 10 has an amplitude over the substantially entire width of the portion where the outer peripheral edge of the sheet member made of the double-sided pressure-sensitive adhesive sheet overlaps the protruding layer 31 formed on the display panel protection plate 30. The stress relaxation part 41c which consists of a wave-like edge part formed in the sine wave shape with is formed.

  In the sheet-like joining members 40a, 40b, and 40c of the first to third modifications, the stress relaxation portions 41a, 41b, and 41c have a pitch as small as possible, preferably 5 mm or less, more preferably 2 to 3 mm or less. It is desirable to form a wave shape with a pitch.

  In the first to third modifications, the outer peripheral edge of the sheet-like joining member 40b is formed in a shape having an amplitude over substantially the entire width of the portion overlapping the protruding layer 31, but the outer peripheral edge overlaps the protruding layer 31. You may form in the shape with the amplitude over the partial width of a part.

  The sheet-like joining member 40d of the fourth modification shown in FIG. 11 is a hole in which a plurality of through holes 44 are provided at a predetermined pitch in a portion overlapping the protruding layer 31 at the peripheral edge of a sheet member made of a double-sided adhesive sheet. The stress relaxation part 41d which consists of an arrangement | sequence part is formed.

  In the sheet-like joining member 40d of the fourth modified example, it is desirable that the plurality of through holes 44 of the stress relaxation portion 41d be provided with a pitch as small as possible, preferably 5 mm or less, more preferably 2 to 3 mm or less.

  In addition, the bonding method of the above embodiment is not limited to the bonding of the liquid crystal display panel 10 and the display panel protection plate 30 on which the protruding layer 31 is formed, and an organic EL (electroluminescence) light emitting layer is provided on the substrate. The present invention can also be applied to bonding of an organic EL display panel in which an optical film such as a prism sheet is bonded to the outer surface of the substrate and the display panel protection plate 30. In that case, the organic EL display panel is prepared as a first plate-shaped component in the first component preparation step. In addition to the organic EL display panel, the present invention may be applied to other display devices such as a plasma display device and a field emission display device.

[Example 2]
The touch input device shown in FIG. 12 has a resistive film type, a capacitance type, an optical type, an electromagnetic induction type or an ultrasonic type touch panel 18 and a sheet-like bonding member 46 on the front surface of the touch panel 18. The touch panel 18 is provided with a touch panel protective plate 32 that is bonded to the touch panel 18.

  In this embodiment, the touch panel 18 includes the display panel 10 disposed on the surface opposite to the attachment surface of the touch panel protection plate 32, and the display panel 10 is the same as that of the first embodiment. It consists of a liquid crystal display panel.

  The liquid crystal display panel 10 is disposed with its front surface (outer surface of the front polarizing plate 16) pasted on the touch panel 18 with a transparent double-sided adhesive sheet or the like (not shown). A surface light source 20 similar to that of the first embodiment is disposed.

  In the manufacture of the touch input device, the bonding between the touch panel 18 and the touch panel protection plate 32 includes a first component preparation step, a second component preparation step, a bonding member preparation step, a bonding member bonding step, and a component bonding step. The following joining method including the autoclave process performed after the component laminating process is performed.

(First part preparation process)
As a first plate-like component, a touch panel 18 is prepared in which the liquid crystal display panel 10 is arranged on the opposite side of the touch panel protection plate 32 from which it is attached.

(Second part preparation process)
As a 2nd plate-shaped component, it is formed in the shape substantially the same as the external shape of the said touch panel 18, and the outer periphery of the area | region facing the touch area (not shown) of the said touch panel 18 in the peripheral part of the sticking surface with respect to the said touch panel 18 is carried out. A touch panel protection plate 32 having a frame-shaped protruding layer 33 formed of a print layer or the like is prepared.

  In the second component preparation step, when the touch panel 18 is a resistance film type touch panel that detects contact between resistance films due to touch pressure, a flexible protection plate is prepared as the touch panel protection plate 32. Further, when the touch panel 18 is a capacitive type or electromagnetic induction type touch panel, a dielectric protective plate is prepared as the touch panel protective plate 32. Further, when the touch panel 18 is an optical touch panel, a protective plate having a low light refractive index is prepared as the touch panel protective plate 32. When the touch panel 18 is an ultrasonic touch panel, the touch panel protection is performed. A protective plate having a high ultrasonic transmission property is prepared as the plate 32.

(Jointing member preparation process)
A flat shape is formed between the touch panel 18 and the touch panel protection plate 32 so as to be overlapped with substantially the entire protruding layer 33, and the overlapping portion is partially overlapped with the protruding layer 33. A sheet-like joining member 46 made of a double-sided pressure-sensitive adhesive sheet is prepared, in which a stress relaxation portion 47 is formed that has a reduced contact area with the protruding layer 33.

  In addition, the stress relaxation part 47 of this sheet-like joining member 46 is the stress relaxation part 41 of the sheet-like joining members 40, 40a, 40b, 40c, and 40d of the first embodiment and the first to fourth modifications thereof. It is formed in the same shape as any of 41a, 41b, 41c, 41d.

(Jointing member pasting process)
The sheet-like joining member 46 is positioned on one of the touch panel 18 and the touch panel protection plate 32, preferably the touch panel protection plate 32 on which the projection layer 33 is formed, so that the stress relaxation portion 47 overlaps the projection layer 33. And paste.

(Parts bonding process)
Next, under the vacuum pressure, the touch panel 18 and the touch panel protective plate 32 are stacked and pressed through the sheet-like bonding member 46 to press the touch panel 18 and the touch panel protective plate 32 with the sheet-like bonding member 46. Paste together.

  As described above, when the touch panel 18 and the touch panel protection plate 32 are overlapped and pressed through the sheet-like bonding member 46, the peripheral portion of the sheet-like bonding member 46 that is overlapped with the protruding layer 33 is crushed. Then, the sheet-like bonding member 46 is in close contact with the touch panel 18 and the touch panel protection plate 32 over the entire area, and the touch panel 18 and the touch panel protection plate 32 are bonded together by the sheet-like bonding member 46.

  In the bonding of the touch panel 18 and the touch panel protection plate 32, the stress relieving portion 47 is formed in a portion overlapping the protruding layer 31 of the sheet-like bonding member 46. Can be bonded to the portion of the sheet-like joining member 46 that overlaps the protruding layer 33 without causing a large stress.

(Autoclave process)
Next, an autoclave for applying heat and pressure to the bonded touch panel 18 and the touch panel protection plate 32 for a certain period of time is performed, and the touch panel protection plate 32 and the touch panel 18 in the bonding member bonding process and the component bonding process. And the sheet-like joining member 46 are melted into the sheet-like joining member 46.

  As described above, the joining method includes a sheet-like joining member in which the touch panel 18 and the touch panel protection plate 32 on which the projecting layer 33 is formed are formed with the stress relaxation portion 47 in a portion overlapping the projecting layer 33. 46, the touch panel 18 and the touch panel protection plate 32 can be bonded together without causing a large stress on the portion of the sheet-like bonding member 46 that overlaps the protruding layer 33. It can suppress that the peeling by the said stress, etc. arise in the bonding part of the said touchscreen 18 and the touchscreen protective plate 32. FIG.

  In addition, the stress relaxation portion 47 of the sheet-like joining member 46 is formed in a shape where the contact area with the protruding layer 33 is reduced by partially removing the overlapping portion at the portion overlapping the protruding layer 33. Therefore, also in the stress relaxation part 47 of this sheet-like joining member 46, the said touch panel 18 and the touch panel protection board 32 can be bonded together with sufficient intensity | strength.

  Moreover, since the said joining method is performing the said autoclave after bonding of the said touch panel 18 and the touch panel protection board 32, it is confined between the said touch panel protection board 32 and the touch panel 18, and the said sheet-like joining member 46. FIG. Thus, the bonding strength between the touch panel 18 and the touch panel protection plate 32 can be kept high in the entire bonding region by the sheet bonding member 46.

  In addition, the joining method of this embodiment is not limited to the bonding of the touch panel 18 in which the liquid crystal display panel 10 is disposed on the surface opposite to the bonding surface of the touch panel protection plate 32 and the touch panel protection plate 32. It is also applicable to bonding of the touch panel 18 in which another display device such as the organic EL display panel, plasma display device, field emission display device or the like is disposed on the opposite surface to the touch panel protective plate 32. it can.

  Furthermore, the joining method of this embodiment can be applied to bonding of the touch panel protective plate 32 and a single touch panel 18 in which a display panel or the like is not disposed on the opposite surface of the touch panel protective plate 32. it can.

[Example 3]
The liquid crystal display panel 10a shown in FIG. 13 is a peripheral edge of the bonding surface of the front polarizing plate 16 to the display panel body 11 of the two polarizing plates 16 and 17 of the liquid crystal display panel 10 in the first and second embodiments. A protruding layer 35 made of a print layer or the like is formed in a frame shape surrounding the screen area 11a (see FIG. 1) of the display panel body 11, and the display panel body 11 and the front polarizing plate 16 are It is bonded by the joint member 48.

  The rear polarizing plate 17 of the liquid crystal display panel 10a is a polarizing plate that does not form the protruding layer 35 or the like, and the rear surface of the display panel body 11 (the outer surface of the rear substrate 13) by a double-sided adhesive sheet or the like (not shown). It is affixed to. A surface light source 20 similar to that of the first embodiment is disposed on the rear side of the liquid crystal display panel 10a.

  In the manufacture of the liquid crystal display panel 10a, the bonding of the display panel body 11 and the front polarizing plate 16 includes a first component preparation step, a second component preparation step, a bonding member preparation step, a bonding member bonding step, and component bonding. The joining process and the autoclave process performed after the component laminating process are performed by the following joining method.

(First part preparation process)
As a first plate-like component, a display panel body 11 is prepared in which a liquid crystal layer 15 is provided between two transparent substrates 12 and 13 that are opposed to each other, and the rear polarizing plate 17 is attached to the rear surface.

(Second part preparation process)
As the second plate-like component, a front polarizing plate 16 is prepared which is formed in substantially the same shape as the outer shape of the display panel main body 11 and in which the protruding layer 35 is formed on the peripheral edge of the affixing surface to the display panel main body 11. .

(Jointing member preparation process)
The planar shape is formed between the display panel body 11 and the front polarizing plate 16 so as to be overlapped with substantially the entire protruding layer 33, and the overlapping portion is partly overlapped with the protruding layer 35. A sheet-like joining member 48 made of a double-sided pressure-sensitive adhesive sheet is prepared, in which a stress relaxation portion 49 having a reduced contact area with the protruding layer 33 is formed.

  In addition, the stress relaxation part 49 of this sheet-like joining member 48 is the stress relaxation part 41 of the sheet-like joining members 40, 40a, 40b, 40c, and 40d of the first embodiment and the first to fourth modifications thereof. It is formed in the same shape as any of 41a, 41b, 41c, 41d.

(Jointing member pasting process)
One of the display panel body 11 and the front polarizing plate 16, preferably the front polarizing plate 16 on which the protruding layer 35 is formed, and the sheet-like bonding member 48 overlap the protruding layer 35 with the stress relaxation portion 49. Position and paste on.

(Parts bonding process)
Next, under vacuum pressure, the display panel main body 11 and the front polarizing plate 16 are stacked and pressed through the sheet-like joining member 48 to press the display panel main body 11 and the front polarizing plate 16 in the sheet form. The bonding member 48 is used for bonding.

  As described above, when the display panel body 11 and the front polarizing plate 16 are stacked and pressed through the sheet-like bonding member 48, the peripheral portion of the sheet-like bonding member 48 that is overlaid on the protruding layer 35 is pushed. The sheet-like joining member 48 is crushed and is in close contact with the display panel main body 11 and the front polarizing plate 16 over the entire area, and the display panel main body 11 and the front polarizing plate 16 are bonded together by the sheet-like joining member 48. .

  In the bonding of the display panel body 11 and the front polarizing plate 16, since the stress relaxation portion 49 is formed in a portion overlapping the protruding layer 35 of the sheet-like bonding member 48, the display panel body 11 and the front side The polarizing plate 16 can be bonded to the portion of the sheet-like joining member 48 that overlaps the protruding layer 35 without causing a large stress.

(Autoclave process)
Next, an autoclave for applying heat and pressure to the bonded display panel body 11 and the front polarizing plate 16 for a certain period of time is performed, and the display panel body 11 in the bonding member bonding process and the component bonding process. The air trapped between the front polarizing plate 16 and the sheet-like bonding member 48 is dissolved in the sheet-like bonding member 48.

  As described above, the bonding method is a sheet-like structure in which the display panel body 11 and the front polarizing plate 16 on which the protruding layer 35 is formed are formed with the stress relaxation portion 49 in a portion overlapping the protruding layer 35. Since the bonding is performed by the bonding member 48, the display panel main body 11 and the front polarizing plate 16 are bonded to each other without causing large stress on the portion of the sheet-shaped bonding member 48 that overlaps the protruding layer 35. Therefore, it is possible to suppress the occurrence of peeling or the like due to the stress at the bonded portion between the display panel body 11 and the front polarizing plate 16.

  In addition, the stress relaxation portion 49 of the sheet-like joining member 48 is formed in a shape that reduces the contact area with the protruding layer 35 by partially removing the overlapping portion in the portion overlapping the protruding layer 35. Therefore, also in the stress relaxation part 49 of this sheet-like joining member 48, the said display panel main body 11 and the front side polarizing plate 16 can be bonded together with sufficient intensity | strength.

  Moreover, since the said joining method is performing the said autoclave after bonding the said display panel main body 11 and the front side polarizing plate 16, the said front side polarizing plate 16, the display panel main body 11, and the said sheet-like joining member 48 are used. The air trapped in between is melted into the sheet-like bonding member 48, and the bonding strength between the display panel main body 11 and the front polarizing plate 16 is maintained high throughout the bonding region of the sheet-like bonding member 48. can do.

  Note that the bonding method of this embodiment is not limited to the bonding of the display panel body 11 and the front polarizing plate 16, but a display panel body in which an organic EL light emitting layer is provided on a substrate, and the bonding to the display panel body. The present invention can also be applied to bonding with an optical film such as a prism sheet having a protruding layer formed on the peripheral edge of the surface. In addition to the organic EL display panel, the present invention may be applied to other display devices such as a plasma display device and a field emission display device.

[Other embodiments]
In each of the above embodiments, a double-sided pressure-sensitive adhesive sheet is used as the sheet-like joining members 40, 46, and 48 for laminating the first plate-like component and the second plate-like component. The joining members 40, 46, and 48 are not limited to double-sided pressure-sensitive adhesive sheets, and may be, for example, resin sheets or the like coated with a thermopolymerizable or photopolymerizable adhesive on both sides. In that case, after the autoclave process, the thermopolymerizable Alternatively, a photopolymerizable adhesive may be polymerized.

  Further, the first plate-like component and the second plate-like component are not limited to those in the above embodiments, and may be other plate-like components. Furthermore, the second plate-like component is not limited to the peripheral portion, and may be a member in which a protruding layer is formed in a portion other than the peripheral portion (for example, a portion facing the screen area of the display panel). What is necessary is just to form the stress relaxation part which provided the several through-hole with the predetermined pitch in the part which overlaps with the said protrusion layer of a cylindrical joining member.

  DESCRIPTION OF SYMBOLS 10 ... Liquid crystal display panel, 11 ... Display panel main body, 11a ... Screen area, 12, 13 ... Transparent substrate, 15 ... Liquid crystal layer, 16, 17 ... Optical film (polarizing plate), 18 ... Touch panel, 20 ... Surface light source, 30 ... Display panel protection plate, 32 ... Touch panel protection plate, 31, 33, 35 ... Projection layer, 40, 40a, 40b, 40c, 40d, 46, 48 ... Sheet-like joining member, 41, 41a, 41b, 41c, 41d, 47, 49 ... Stress relaxation part, 42 ... Notch part, 43 ... Uncut part, 44 ... Through-hole, 45a, 45b ... Separator, A ... Air reservoir

Claims (9)

The first plate-shaped component and the second plate-shaped component in which a protruding layer is formed on a predetermined portion of the bonding surface for the first plate-shaped component are bonded and bonded together by a sheet-shaped bonding member. ,
A first component preparation step of preparing the first plate-shaped component;
A second component preparation step of preparing the second plate-shaped component on which the protruding layer is formed;
Formed in a shape that is sandwiched between the first plate-like component and the second plate-like component in a state where it overlaps with a part of the protruding layer, and over the entire area overlapping the protruding layer, A joining member preparation step of preparing a sheet-like joining member in which a stress relaxation portion in which an overlapping portion is partially lost and the contact area with the protruding layer is reduced is formed;
A bonding member bonding step for positioning and bonding the sheet-shaped bonding member to the second plate-shaped component so that the stress relaxation portion overlaps the protruding layer;
The first plate-like component and the second plate-like component are overlapped and pressed through the sheet-like joining member, and the first plate-like component and the second plate-like component are put into the sheet-like shape. Component bonding process to be bonded by the joining member;
The joining method of the plate-shaped components characterized by including. The first plate-shaped component and the second plate-shaped component in which a protruding layer is formed on a predetermined portion of the bonding surface for the first plate-shaped component are bonded and bonded together by a sheet-shaped bonding member. ,
A first component preparation step of preparing the first plate-shaped component;
A second component preparation step of preparing the second plate-shaped component on which the protruding layer is formed;
Formed in a shape that is sandwiched between the first plate-like component and the second plate-like component in a state where it overlaps with a part of the protruding layer, and over the entire area overlapping the protruding layer, A joining member preparation step of preparing a sheet-like joining member in which a stress relaxation portion in which an overlapping portion is partially lost and the contact area with the protruding layer is reduced is formed;
A joining member attaching step of attaching the sheet-like joining member to the first plate-like component;
The first plate-like component and the second plate-like component are positioned so that the stress relieving portion overlaps the protruding layer, and the first plate-like component and the second plate-like component are overlapped and pressurized via the sheet-like joining member, Component laminating step of laminating the plate-shaped component and the second plate-shaped component with the sheet-shaped joining member
The joining method of the plate-shaped components characterized by including. In the second component preparing step, the second plate-like component having a frame-shaped protruding layer formed on the first peripheral portion is prepared, and in the joining member preparing step, the second peripheral portion is at least of the protruding layer. A sheet-like joining member is prepared which is formed in a shape overlapping with an inner peripheral edge, and in which the stress relaxation portion is formed on the second peripheral edge over the entire area overlapping with the protruding layer. The method for joining plate-like parts according to claim 1 or 2.   The method for joining plate-like parts according to any one of claims 1 to 3, wherein the part pasting step is performed under vacuum pressure.   The autoclave process of performing the autoclave which gives heat and pressure to the 1st plate-like parts and the 2nd plate-like parts for a fixed time after the parts pasting process is further included. The method for joining plate-like parts according to any one of 1 to 4. In the joining member preparing step, the the second peripheral portion, sheet-like the stress absorbing portions of the plurality of notch-shaped over the entire width is formed at a predetermined pitch in a portion from an outer peripheral edge overlaps with the protruding layer is formed 6. A method for joining plate-like parts according to claim 5, wherein a joining member is prepared. Prepared in the joining member preparation step, the second peripheral edge, a sheet-like joining member of the stress relaxation portion formed in a waveform shape having an amplitude over the whole width is formed of a portion of the outer peripheral edge thereof overlaps with the protruding layer The method for joining plate-like parts according to claim 5, wherein:   In the joining member preparing step, a sheet-like joining member is prepared in which a stress relaxation portion in which a plurality of through holes are provided at a predetermined pitch is formed in a portion overlapping the protruding layer of the second peripheral edge portion. The method for joining plate-like parts according to claim 5. A sheet-shaped joining member for bonding a first plate-shaped component and a second plate-shaped component in which a protruding layer is formed on a predetermined portion of a bonding surface for the first plate-shaped component,
Formed in a planar shape that is sandwiched between the first plate-like component and the second plate-like component in a state where it overlaps a part of the protruding layer, and over the entire area overlapping the protruding layer, A sheet-like joining member comprising a sheet member formed with a stress relaxation portion in which an overlapping portion is partially omitted to reduce a contact area with the protruding layer.

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