WO2014148195A1 - パネル積層体の製造方法、及び硬化状態判別方法 - Google Patents
パネル積層体の製造方法、及び硬化状態判別方法 Download PDFInfo
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- WO2014148195A1 WO2014148195A1 PCT/JP2014/054114 JP2014054114W WO2014148195A1 WO 2014148195 A1 WO2014148195 A1 WO 2014148195A1 JP 2014054114 W JP2014054114 W JP 2014054114W WO 2014148195 A1 WO2014148195 A1 WO 2014148195A1
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- panel
- test
- adhesive sheet
- main body
- light
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- C—CHEMISTRY; METALLURGY
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Definitions
- the present invention relates to a method for manufacturing a panel laminate and a method for determining a cured state.
- a liquid crystal display device such as a portable information terminal provided with a liquid crystal display panel is known.
- This type of liquid crystal display device includes a transparent protective panel (cover panel) for protecting the surface of the liquid crystal display panel.
- the protection panel has been configured to be attached to the upper part of a box-shaped housing that houses the liquid crystal display panel.
- a protective panel is directly attached to the front surface (display surface) of the liquid crystal display panel using an adhesive.
- an adhesive made of an ultraviolet curable resin (hereinafter referred to as an ultraviolet curable adhesive) is used.
- the UV curable adhesive is applied to the surface of either the liquid crystal display panel or the protective panel in an uncured state. And a liquid crystal display panel and a protection panel are bonded together so that the apply
- Patent Document 2 and Patent Document 3 show a technique in which substrates constituting a liquid crystal display panel are bonded to each other using an ultraviolet curable seal resin for enclosing liquid crystal.
- the seal resin contains a colorant that changes in color when it receives ultraviolet rays, and that the cured state of the seal resin can be visually confirmed by the presence or absence of a change in color.
- JP 2011-158851 A Japanese Patent Laid-Open No. 11-109382 JP 2000-330122 A
- Patent Documents 2 and 3 described above a colorant that changes in color when exposed to ultraviolet light is blended in an ultraviolet curable adhesive, and the cured state is confirmed by color change before and after ultraviolet irradiation. It is also possible. However, since the ultraviolet curable adhesive between the protective panel and the liquid crystal display panel is formed so as to cover the display surface of the liquid crystal display panel, if the colorant is blended, the image quality of the liquid crystal display device is degraded. Cause a problem.
- An object of the present invention is to provide a technique capable of easily discriminating the cured state of an ultraviolet curable adhesive when manufacturing a panel laminate by bonding panel bodies together with an ultraviolet curable adhesive interposed therebetween. It is.
- the panel laminate manufacturing method includes a plate material that transmits light, and a first panel body that is formed in a frame shape on the peripheral side of one plate surface of the plate material and has a layered light blocking portion that blocks light.
- a first pasting step in which one side of an adhesive sheet having a main body part and a test part that extends outward from the periphery of the main body part and is superimposed on the light shielding part is pasted in an uncured state; One plate surface of the second panel body is exposed so that the test portion is exposed from the periphery of the two-panel body and the main body portion is sandwiched between the second panel body and the first panel body. Others in the uncured adhesive sheet
- the cured state of the adhesive sheet can be easily determined based on the state when the test part is peeled off.
- the peeling step includes a step of measuring a peel force at the time of peeling of the test part, and the determining step is based on a measurement result of the test part. It may include a step of determining the cured state.
- the state at the time of peeling of the test part can be quantitatively grasped by the peel force measured at the time of peeling of the test part, and the cured state of the adhesive sheet is accurately determined. be able to.
- the adhesive sheet has a separation guide line that induces separation of the main body portion and the test portion at a boundary portion between the main body portion and the test portion, and the peeling step
- the test part may be separated from the main body part along the separation guide line.
- the test part can be reliably separated from the main body part. In other words, when the test part is peeled off, the main part is cracked and the main part is damaged, or the test part is separated from the main part in such a way that a part of the test part remains on the main part. Occurrence of defective peeling is suppressed.
- a portion of the test portion that is connected to the main body portion may be thinner than an outer portion thereof. According to the method for manufacturing the panel laminate, the test part can be easily separated from the main body part.
- the peeling step can be performed a plurality of times (two times or more). Therefore, for example, in the determination step after the peeling step, when it is determined that the curing is insufficient, after the ultraviolet irradiation is performed again, the peeling step and the determination step can be performed to grasp the cured state. Moreover, the cured state of the adhesive sheet can be accurately grasped based on a plurality of peeling steps.
- the second panel body may be a liquid crystal display panel.
- the second panel body may be a touch panel.
- a cured state determination method includes a plate material that transmits light, a first panel body that is formed in a frame shape on the peripheral side of one plate surface of the plate material, and includes a layered light-shielding portion that blocks light.
- a sheet comprising a two-panel body and a transparent ultraviolet-curing adhesive that is cured when receiving ultraviolet rays in an uncured state, and covering the plate surface of the first panel body exposed from the inside of the light-shielding portion.
- a cured state of the adhesive sheet in a panel laminate comprising: an adhesive sheet that is sandwiched between the first panel body and the second panel body and bonds the first panel body and the second panel body together.
- the adhesive sheet extends from the periphery of the main body portion toward the outside, and the main body portion mainly covers the plate surface of the first panel body exposed from the inner side of the light shielding portion.
- the second panel And a test part that is affixed on the light-shielding part so as to be exposed to the outside from the peripheral edge, and the test part is separated from the light-shielding part so as to be separated from the main body part,
- the cured state of the adhesive sheet is determined. According to the cured state determination method, the cured state of the adhesive sheet can be easily determined based on the state when the test part is peeled off.
- the cured state determination method when the test part is peeled from the light shielding part, the peel force of the test part is measured, and the cured state of the adhesive sheet is determined based on the measurement result of the test part. It may be a thing. According to the cured state determination method, the state at the time of peeling of the test part can be quantitatively grasped by the peel force measured at the time of peeling of the test part, and the cured state of the adhesive sheet can be accurately determined. it can.
- the adhesive sheet has a separation guide line for inducing separation between the main body portion and the test portion at a boundary portion between the main body portion and the test portion.
- the test part may be separated from the main body part along the separation guide line.
- the test part can be reliably separated from the main body part. In other words, when the test part is peeled off, the main part is cracked and the main part is damaged, or the test part is separated from the main part in such a way that a part of the test part remains on the main part. Occurrence of defective peeling is suppressed.
- the invention's effect According to the present invention, it is possible to provide a technique capable of easily determining the cured state of an ultraviolet curable adhesive when manufacturing a panel laminate by bonding panel bodies so as to sandwich an ultraviolet curable adhesive. Can do.
- FIG. 1 is a perspective view of a liquid crystal display device according to Embodiment 1.
- FIG. 4 is a plan view of a panel laminate in which a liquid crystal display panel is pasted on the ultraviolet curable adhesive sheet shown in FIG. A-A 'line sectional view of FIG. Cross section of panel laminate after autoclaving Explanatory drawing of the process of irradiating the panel laminate with ultraviolet rays to cure the ultraviolet curable adhesive sheet Explanatory drawing which shows the content of the peeling test in a panel laminated body
- the top view of the panel laminated body concerning Embodiment 4 The top view of the panel laminated body concerning Embodiment 5
- Embodiment 1 of the present invention will be described with reference to FIGS. 1 to 9.
- a method for manufacturing a panel laminate included in a liquid crystal display device and a method for determining a cured state in the panel laminate will be described as examples.
- FIG. 1 is a perspective view of a liquid crystal display device 10 according to the first embodiment.
- the liquid crystal display device 10 has a generally vertically long rectangular shape (rectangular shape) as a whole, and the front surface (display surface) is covered with a transparent cover panel 11.
- a liquid crystal display panel (an example of a second panel body) 12 is provided.
- the cover panel 11 and the liquid crystal display panel 12 are bonded together via an ultraviolet curable adhesive sheet described later.
- Each component constituting the liquid crystal display device 10 such as the cover panel 11 and the liquid crystal display panel 12 is housed in a housing 13.
- the housing 13 has a shallow box shape with an upper opening, and is made of synthetic resin or metal.
- the panel bodies for example, the cover panel 11 and the liquid crystal display panel 12 bonded to each other with the ultraviolet curable adhesive sheet interposed therebetween are particularly referred to as a panel laminate.
- the cover panel 11 has a substantially vertically long rectangular shape and is made of a transparent plate made of glass, a transparent resin such as an acrylic resin, or the like.
- the four corners of the outer edge portion of the cover panel 11 are chamfered in an arc shape (R shape).
- the cover panel 11 protects the liquid crystal display panel 12, and is arranged in a form that covers the liquid crystal display panel 12 from the display surface side over the entire area.
- the user of the liquid crystal display device 10 visually recognizes the image through the cover panel 11.
- a frame-like (frame-like) non-transmissive region S 2 that does not transmit light surrounding the transmissive region S 1 and does not display an image.
- Examples of the light that is transmitted through the transmissive region S1 and the light that is not transmitted through the non-transmissive region S2 include visible light and ultraviolet light.
- FIG. 2 is a plan view of the cover panel 11 viewed from the back side.
- a light shielding portion 14 for shielding light is formed at the peripheral edge portion of the surface on the back side of the cover panel 11.
- the light shielding portion 14 is made of a black paint or the like, and is formed in a layer shape (film shape) on the back surface of the cover panel 11 using printing means such as screen printing or ink jet printing.
- the light-shielding portion 14 has a frame shape (frame shape) as a whole, and forms the above-described non-transmissive region S2.
- the back surface of the cover panel 11 is exposed from the inside of the non-transmissive area S2 having a frame shape, and this exposed portion becomes the above-described transmissive area S1.
- the light-shielding part 14 is formed in the back surface side of the cover panel 11 becomes the 1st panel body 110 in this embodiment.
- FIG. 3 is a plan view of the ultraviolet curable adhesive sheet 15.
- the ultraviolet curable adhesive sheet (an example of an adhesive sheet) 15 is a double-sided adhesive transparent adhesive sheet, and is used when the cover panel 11 and the liquid crystal display panel 12 are bonded together.
- the ultraviolet curable adhesive sheet 15 is made of a sheet of an ultraviolet curable adhesive that has not yet been completely cured (hereinafter referred to as an uncured state). It hardens
- the ultraviolet curable adhesive sheet 15 is sometimes called an optical transparent adhesive (OCA: Optical Clear Adhesive) or the like. For example, a sheet having a thickness of about 175 ⁇ m is used.
- OCA optical Clear Adhesive
- the front surface and the back surface of the ultraviolet curable adhesive sheet 15 are adhesive surfaces that are attached to the adherend.
- the ultraviolet curable adhesive sheet 15 in a state before being attached to the adherend (that is, before use) has each adhesive surface protected by a release liner, and each adhesive surface is attached when being attached to the adherend.
- the release liner is appropriately peeled off.
- the uncured UV curable adhesive sheet 15 has sufficient strength (hardness) to maintain the shape (sheet shape). Furthermore, the ultraviolet curable adhesive sheet 15 has at least thermoplasticity in an uncured state, and is softened by heating.
- the ultraviolet curable adhesive sheet 15 has a vertically long rectangular shape as in the case of the cover panel 11 or the like.
- the ultraviolet curable adhesive sheet 15 includes a rectangular main body 15a for covering the transmission region S1 of the cover panel 11 from the back surface side, and a small piece extending from the end of the main body 15a toward the outside. And a test unit 15b.
- the test portion 15b extends outward from the outer peripheral edge on one long side of the outer peripheral edge 15d of the main body 15a.
- the test portion 15b of the present embodiment is smaller than the main body portion 15a and is set to a size that fits within the non-transmissive region S2.
- a separation guide line 15c for guiding the separation between the test part 15b and the main body part 15a is provided at the boundary portion between them.
- the separation guide wire 15c of the present embodiment is composed of small holes or grooves arranged in a line along a boundary portion (boundary line) between the test portion 15b and the main body portion 15a at a predetermined interval. (Dashed line).
- the test part 15b is a part used for a peeling test performed to grasp the cured state of the ultraviolet curable adhesive sheet 15, and is peeled off from the light shielding part 14 which is an adherend, and finally the main body part 15a. It is a part separated from. Since the test part 15b is formed on the light-shielding part 14 on the back side of the cover panel 11, even if a fine strip of the test part 15b remains on the cover panel 11 side (light-shielding part 14), the panel stacking An adverse effect on the display performance of the body (liquid crystal display device 10) is suppressed.
- FIG. 4 is an explanatory view showing a state in which the ultraviolet curable adhesive sheet 15 is attached to the cover panel 11.
- the ultraviolet curable adhesive sheet 15 is bonded to the cover panel 11 side (first bonding step).
- the UV curable adhesive sheet 15 is attached to the cover panel 11 under atmospheric pressure (normal pressure) conditions using a known sheet attaching apparatus.
- the ultraviolet curable adhesive sheet 15 covers the entire transmission region S ⁇ b> 1 (the entire region), and the outer peripheral edge 15 d of the ultraviolet curable adhesive sheet 15 is on the inner peripheral edge 14 a of the frame-shaped light shielding portion 14. It is affixed to the back surface of the cover panel 11 in a form that rides on. And the test part 15b of the ultraviolet curable adhesive sheet 15 is affixed on the light-shielding part 14 so that it may fit in the non-transmissive area
- the separation guide line 15c is arranged outside the inner peripheral edge 14a of the light shielding portion 14 (that is, the boundary between the transmission region S1 and the non-transmission region S2). That is, the separation guide line 15 c is disposed on the light shielding portion 14.
- the ultraviolet curable adhesive sheet 15 has a configuration in which the test portion 15b is extended from a part of the peripheral edge 15d of the main body portion 15, and thus the main body portion 15 and the test portion 15b are attached together. It can be attached to the body (first panel body).
- FIG. 5 is a plan view of a panel laminate 16 in which the liquid crystal display panel 12 is bonded onto the ultraviolet curable adhesive sheet 15 shown in FIG.
- the liquid crystal display panel 12 has a vertically long rectangular shape as in the case of the cover panel 11 or the like, and is a transmissive region S ⁇ b> 1 (a main body portion 15 a of the ultraviolet curable adhesive sheet 15). It has a size that fits inside.
- the liquid crystal display panel 12 mainly includes a pair of transparent substrates (a thin film transistor array substrate and a color filter substrate) that sandwich a liquid crystal layer, and a polarizing plate attached to the outside of the pair of substrates. In the present specification, the liquid crystal display panel 12 will be described as one panel body (second panel body). As shown in FIG. 5, the liquid crystal display panel 12 is connected to a flexible printed board 17 that is used to supply power and control signals to the liquid crystal display panel 12.
- the liquid crystal display panel 12 is attached to the ultraviolet curable adhesive sheet 15 such that the display surface on the front side is in contact with the adhesive surface on the back side of the ultraviolet curable adhesive sheet 15. After that, the liquid crystal display panel 12 is finely adjusted as necessary for the attachment location (alignment) on the ultraviolet curable adhesive sheet 15. Since the ultraviolet curable adhesive sheet 15 at this stage is in an uncured state, the liquid crystal display panel 12 is peeled off from the adhesive surface of the ultraviolet curable adhesive sheet 15 and reattached, or the liquid crystal display panel 12 is ultraviolet cured. It can be slightly moved on the adhesive surface of the mold adhesive sheet 15. The liquid crystal display panel 12 is finally attached to the main body portion 15a of the ultraviolet curable adhesive sheet 15 so as to be within the transmission region S1.
- the outer peripheral edge 12 a of the liquid crystal display panel 12 is disposed on the inner side of the inner peripheral edge 14 a of the light shielding unit 14.
- the liquid crystal display panel 12 is attached to the ultraviolet curable adhesive sheet 15 on the back surface of the cover panel 11 using a known vacuum bonding apparatus.
- FIG. 6 is a cross-sectional view taken along the line A-A ′ in FIG. 5, and schematically shows a cross-sectional structure of the panel laminate 16 in the vicinity where the test portion 15 b is formed.
- the ultraviolet curable adhesive sheet 15 is in an uncured state and has a certain degree of flexibility.
- a gap (bubble) B may be formed between the outer peripheral edge 15 d of the main body portion 15 a and the cover panel 11 in the ultraviolet curable adhesive sheet 15.
- the gap B is formed by overlapping the light shielding portion 14 that is formed in a stepped shape from the back surface of the cover panel 11 so that the outer peripheral edge 15d of the main body portion 15a rides up.
- the gap (bubble) B is also formed by the influence of the residual stress of the ultraviolet curable adhesive sheet 15, the difference in thermal expansion coefficient between the ultraviolet curable adhesive sheet 15 and the cover panel 11, or the like.
- the panel laminate 16 including the uncured ultraviolet curable adhesive sheet 15 shown in FIG. 6 is subjected to heat treatment for the purpose of eliminating gaps (bubbles) B or the like.
- the conditions for the heat treatment are appropriately set in consideration of various conditions such as the size of the panel laminate 16 to be heated and the materials used for the panel laminate 16. In the case of this embodiment, it heat-processes on condition of 60 degreeC and 30 minutes, for example using a well-known heat processing apparatus.
- FIG. 7 is a cross-sectional view of the panel laminate 16 after the autoclave treatment.
- the uncured ultraviolet curable adhesive sheet 15 Since the uncured ultraviolet curable adhesive sheet 15 has thermoplasticity, it is softened when heated and can be deformed following the shape of the cover panel 11 and the light shielding portion 14. Further, the gas in the gaps (bubbles) B formed between the adhesive surface on the front side of the ultraviolet curable adhesive sheet 15 and the cover panel 11 and the light shielding part 14 is reliably transferred to the outside by autoclaving. I can escape.
- FIG. 8 is an explanatory diagram of a process of irradiating the panel laminate 16 with ultraviolet rays 18 to cure the ultraviolet curable adhesive sheet 15.
- UV irradiation to the UV curable adhesive sheet 15 included in the panel laminate 16 is performed using a known UV irradiation device.
- the ultraviolet rays 18 are irradiated toward the front side surface of the panel laminate 16 (that is, the surface of the cover panel 11) and the peripheral end surface of the panel laminate 16.
- the ultraviolet ray 18 passes through the cover panel 11 and further reaches most of the main body portion 15 a in the ultraviolet curable adhesive sheet 15.
- the curing reaction by ultraviolet irradiation proceeds, and the ultraviolet curable adhesive sheet 15 is cured.
- the outer peripheral edge 15d of the main body 15 is arranged so as to ride on and overlap the light shielding part 14, the outer peripheral edge 15d of the main body 15 when the panel laminate 16 is viewed from the front side. It is in a state hidden behind (non-transparent region S2). Therefore, depending on the ultraviolet rays 18 irradiated from the front side of the panel laminate 16, there is a possibility that curing at the outer peripheral edge 15 d of the main body portion 15 a may be insufficient. Therefore, in this embodiment, as described above, the ultraviolet rays 18 are also irradiated toward the peripheral end surface (side end surface) of the panel laminate 16. When the ultraviolet rays 18 are irradiated in this manner, the ultraviolet rays 18 are reliably distributed to the peripheral portion 15d of the main body portion 15, and the ultraviolet curable adhesive sheet 15 can be cured as a whole.
- test portion 15b included in the ultraviolet curable adhesive sheet 15 is also behind the light shielding portion 14 (non-transmissive region S2) when the panel laminate 16 is viewed from the front side, like the outer peripheral edge 15d of the main body portion 15a. It is in a hidden state. Therefore, the test part 15 b is cured mainly by the ultraviolet rays 18 that are irradiated toward the peripheral end face (side end face) of the panel laminate 16.
- the adhesive performance and elastic modulus of the ultraviolet curable adhesive sheet 15 vary greatly between an uncured state before the ultraviolet ray 18 is irradiated and a cured state after the ultraviolet ray 18 is irradiated.
- the adhesion performance before ultraviolet irradiation is 10 (N / 25 mm)
- the adhesion performance after ultraviolet irradiation. is 25 (N / 25 mm)
- the elastic modulus (Pa) of the ultraviolet curable adhesive sheet 15 of the present embodiment is 104 (Pa) before ultraviolet irradiation and 105 (Pa) after ultraviolet irradiation.
- the ultraviolet curable adhesive sheet 15 is irradiated with the ultraviolet rays 18 (the cured state of the ultraviolet curable adhesive sheet 15) is determined by the ultraviolet curable adhesive. It can discriminate
- the test part 15b is an unnecessary part for bonding the panel bodies, and there is no problem even if the test part 15b is peeled off from the cover panel 11.
- FIG. 9 is an explanatory diagram showing the contents of a peeling test (peeling step) in the panel laminate 16.
- the test portion 15b formed on the light shielding portion 14 is peeled off from the end side (peeling step).
- the test portion 15b is separated from the main body portion 15a with the separation guide line 15c as a boundary while being peeled off (peeled off) from the light shielding portion 14.
- the test unit 15b is finally peeled off from the light shielding unit 14 and separated from the main body unit 15a.
- a resistance force (hereinafter referred to as a peel force) required for peeling off the test portion 15 b from the light shielding portion 14 as an adherend is measured and measured.
- the determined resistance force is determined by comparing the peel force in the test portion 15b in the cured state obtained in advance with the peel force in the test portion 15b in the uncured state obtained in advance.
- the measured peel force of the test part 15b is equivalent to the peel force of the cured test part 15b obtained in advance, it can be seen that the ultraviolet curable adhesive sheet 15 is sufficiently cured. Moreover, if the peel force of the measured test part 15b is smaller than the peel force of the test part 15b of the hardening state calculated
- the ultraviolet curable adhesive sheet 15 undergoes a curing reaction due to ultraviolet irradiation. I understand that. Further, if the measured peel force of the test portion 15b is equal to the peel force obtained in advance in the uncured test portion 15b, the ultraviolet curable adhesive sheet 15 may not be sufficiently cured. I understand.
- the peel force may be compared as described above, or the elastic moduli obtained from the peel force and the area of the test portion 15b are compared. May be.
- a method of determining the cured state of the other ultraviolet curable adhesive sheet 15 for example, a method of qualitatively determining by visual observation may be mentioned.
- the test part 15b When the test part 15b is in an uncured state, when the test part 15b is peeled off from the light-shielding part 14 and separated from the main body part 15a, the test part 15b extends greatly compared to the case in the cured state. Therefore, when the test part 15b is peeled off, the cured state of the ultraviolet curable adhesive sheet 15 can be roughly determined by visually confirming the extent to which the test part 15b extends. In the visual discrimination method, it can be easily discriminated whether at least the ultraviolet curable adhesive sheet 15 is in an uncured state.
- the panel laminate 16 including the ultraviolet curable adhesive sheet 15 is determined to be a defective product, and is cured by ultraviolet light.
- the mold adhesive sheet 15 is distinguished from a non-defective product that is determined to be in a cured state (a state where the curing is sufficient).
- the panel laminated body 16 judged to be the inferior goods is prevented from being incorporated in the liquid crystal display device 10 at least as it is.
- the panel laminate 16 that has been determined to be defective as described above is subjected to operations such as irradiation with ultraviolet rays so that the ultraviolet curable adhesive sheet 15 is sufficiently cured.
- the reason why the ultraviolet curable adhesive sheet 15 is determined to be in an uncured state is, for example, due to a failure of an irradiation device that irradiates the ultraviolet curable adhesive sheet 15 with ultraviolet rays.
- the case where the ultraviolet curable adhesive sheet 15 is not irradiated with ultraviolet rays is exemplified.
- the panel laminate 16 that is determined to be a non-defective product as described above is finally incorporated into the liquid crystal display device 10 through various manufacturing processes.
- the method for manufacturing the panel laminate 16 according to the present embodiment is formed in a frame shape on the peripheral side of one plate surface of the cover panel 11 that transmits light and the cover panel 11, and has a layer shape that blocks light.
- a sheet made of a transparent ultraviolet curable adhesive that is cured when receiving ultraviolet light in an uncured state with respect to the plate surface of the first panel body 110 having the light shielding part 14, and is exposed from the inside of the light shielding part 14.
- One surface of the adhesive sheet 15 having a main body portion 15a mainly covering the plate surface of one panel body 110, and a test portion 15b extending outward from the periphery of the main body portion 15b and superimposed on the light shielding portion 14,
- a second attaching step in which one plate surface of the second panel body 12 is attached to the other surface of the uncured adhesive sheet 15 so that the main body portion 15b is sandwiched between the first panel and the first panel.
- the test part 15b is peeled off from the light-shielding part 14 so that the adhesive sheet 15 sandwiched between the body 110 and the second panel body 12 is irradiated with ultraviolet rays and the test part 15b is separated from the main body part 15a. And a discriminating step for discriminating the cured state of the adhesive sheet 15 based on the state when the test part 15 is peeled off.
- the cured state of the adhesive sheet 15 can be easily determined based on the state at the time of peeling of the test portion 15b in the determining step.
- a peeling process includes the process in which the peeling force at the time of peeling of the test part 15b is measured, and a discrimination
- the process includes a step of determining the cured state of the adhesive sheet 15. Therefore, in the method for manufacturing the panel laminate 16 of the present embodiment, the state at the time of peeling of the test part 15b can be quantitatively grasped by the peel force measured at the time of peeling of the test part 15b. 15 curing states can be determined.
- the adhesive sheet is provided with the separation guide line 15c for inducing separation between the main body 15a and the test portion 15b at the boundary portion between the main body 15a and the test portion 15b.
- the test portion 15b is separated from the main body portion 15a along the separation guide line 15c. Therefore, in the method for manufacturing the panel laminate 16 of this embodiment, the test part 15b can be reliably separated from the main body part 15a. That is, when the test part 15b is peeled off, the main body part 15a side is cracked and the main body part 15 is damaged, or the test part 15b remains in the main body part 15a side so that a part of the test part 15b remains.
- the cured state determination method includes a cover panel 11 that transmits light, and a frame-shaped light blocking portion 14 that is formed in a frame shape on the peripheral side of one plate surface of the cover panel 11 and blocks light.
- An adhesive sheet that is sandwiched between the first panel body 110 and the second panel body 12 so as to cover the plate surface of the first panel body 110 to be bonded, and bonds the first panel body 110 and the second panel body 12 together.
- the cured state of the adhesive sheet 15 in the panel laminate 16 wherein the adhesive sheet 15 is exposed to the plate surface of the first panel body 110 exposed from the inside of the light shielding portion 14.
- a main body portion 15a mainly covering, and a test portion 15b that extends from the periphery of the main body portion 15a toward the outside and is attached to the light shielding portion 14 so as to be exposed to the outside from the periphery of the second panel 12.
- the test part 15b is peeled from the light shielding part 14 so as to be separated from the main body part 15a, and the cured state of the adhesive sheet 15 is determined based on the peeled state.
- the cured state of the adhesive sheet 15 can be easily determined based on the state at the time of peeling of the test portion 15b.
- the hardening state determination method of this embodiment when the test part 15b peels from the light shielding part 14, the peeling force of the test part 15b is measured, and based on the measurement result of the test part 15b, the adhesive sheet 15 The cured state is discriminated. Therefore, in the cured state determination method of this embodiment, the state at the time of peeling of the test part 15 can be quantitatively grasped by the peel force measured at the time of peeling of the test part 15b. Can be determined.
- the adhesive sheet 15 has a separation guide line 15c that induces separation between the main body 15a and the test portion 15b at a boundary portion between the main body 15a and the test portion 15b.
- the test part 15b is peeled from the light shielding part 14, the test part 15b is separated from the main body part 15a along the separation guide line 15c. Therefore, in the cured state determination method of the present embodiment, the test portion 15b can be reliably separated from the main body portion 15a.
- the test portion 15b when the test portion 15b is peeled off, the main body portion 15a side is cracked and the main body portion 15a is damaged, or the test portion 15b remains in the main body portion 15a side so that a part of the test portion 15b remains.
- production of peeling defect, such as being separated from, is suppressed.
- the test part 15 b is peeled off, if the main part 15 a is cracked and the main part 15 is damaged, the damage causes a display defect of the liquid crystal display device 10.
- the panel laminate 16 when the test part 15b is separated from the main body part 15a so that a part of the test part 15b remains on the main body part 15a side, when the panel laminate 16 is incorporated into the liquid crystal display device 10, There is a possibility that the panel laminate 16 may be displaced from the normal position due to interference of the remaining member with the remaining portion. If the panel laminate 16 is displaced in the liquid crystal display device 10, it causes a display defect of the liquid crystal display device 10.
- Embodiment 2 of the present invention will be described with reference to FIG.
- the same parts as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and detailed description thereof is omitted.
- FIG. 10 is a plan view of the panel laminate 16A according to the second embodiment.
- the basic configuration of the panel laminate 16A of the present embodiment is the same as that of the first embodiment.
- the main body portion 15Aa is the same as that of the first embodiment, but the shape of the test portion 15Ab is different from that of the first embodiment. Yes.
- the test part 15Ab has a semicircular shape.
- the semicircular test portion 15Ab is connected to the main body 15Aa such that a portion corresponding to the semicircular “string” is adjacent to the main body 15Aa and a portion corresponding to the “arc” faces outward.
- a separation guide line 15Ac similar to that of the first embodiment is formed at a boundary portion between the main body portion 15Aa and the test portion 15Ab.
- an ultraviolet curable adhesive sheet 15A including a semicircular test portion 15Ab may be used.
- FIG. 11 is a plan view of the panel laminate 16B according to the third embodiment.
- the basic configuration of the panel laminate 16B of the present embodiment is the same as that of the first embodiment.
- the main body portion 15Ba is the same as that of the first embodiment, but the shape of the test portion 15Bb is different from that of the first embodiment. Yes.
- the test unit 15Bb has a substantially circular shape.
- the substantially circular test portion 15Bb is connected to the main body portion 15Ba such that a part of the circumference is adjacent to the main body portion 15Ba. And the part (border part of test part 15Bb and main-body part 15Ba) connected to main-body part 15Ba among test part 15Bb is thinner than the outer part. Note that a separation guide wire 15Bc similar to that of the first embodiment is formed at the boundary between the main body 15Ba and the test portion 15Bb.
- an ultraviolet curable adhesive sheet 15B including a circular test portion 15Bb may be used.
- the test portion 15Bb is particularly easily separated from the main body portion 15Ba because the portion connected to the main body portion 15Ba (the boundary portion between the test portion 15Bb and the main body portion 15Ba) is thinner than the outer portion thereof. It has become.
- FIG. 12 is a plan view of the panel laminate 16C according to the fourth embodiment.
- the basic configuration of the panel laminate 16C of the present embodiment is the same as that of the first embodiment.
- the main body portion 15Ca is the same as that of the first embodiment, but the shape of the test portion 15Cb is different from that of the first embodiment. Yes.
- the test unit 15Cb has a substantially triangular shape.
- the substantially triangular test portion 15Cb is connected to the main body portion 15Ca so that one vertex of the triangle is adjacent to the main body portion 15Ca. And the part (border part of the test part 15Cb and main-body part 15Ca) connected to the main-body part 15Ca among the test parts 15Cb is thinner than the outer part.
- a separation guide line 15Cc similar to that of the first embodiment is formed at the boundary between the main body 15Ca and the test portion 15Cb.
- an ultraviolet curable adhesive sheet 15C having a substantially triangular test portion 15Cb may be used.
- the test portion 15Cb has a portion (a boundary portion between the test portion 15Cb and the main body portion 15Ca) connected to the main body portion 15Ca that is thinner than the outer portion thereof. It is easy to separate from.
- FIG. 13 is a plan view of a panel laminate 16D according to the fifth embodiment.
- the basic configuration of the panel laminate 16D of the present embodiment is the same as that of the first embodiment.
- two test parts 15Db are provided for the main body part 15a.
- the main body 15Da is the same as that of the first embodiment. That is, the external line curable adhesive sheet 15D of the present embodiment has a configuration in which a test section 15Db is further added to the external line curable adhesive sheet 15 of the first exemplary embodiment.
- the test part 15Db has a rectangular shape (rectangular shape) as in the first embodiment, and is connected to the main body part 15Da so that the long side is adjacent to the main body part 15Da.
- a separation guide wire 15Dc similar to that of the first embodiment is formed at the boundary portion between the main body portion 15Da and the test portion 15Db.
- the two test parts 15Db are connected to the main body part 15Da so as to face each other with the main body part 15Da interposed therebetween.
- an ultraviolet curable adhesive sheet 15D including a plurality of test portions 15Db may be used.
- a peeling test (peel test) for peeling the test part 15Db from the light shielding part 14 can be performed a plurality of times. Therefore, for example, in the peeling test (peel test) performed after the ultraviolet irradiation, when it is determined that the curing is insufficient, the peeling test (peel test) may be performed again after performing the ultraviolet irradiation again. it can.
- the peeling test peel test
- the cured state of the ultraviolet curable adhesive sheet 15D can be accurately grasped.
- the second panel body bonded to the first panel body via the ultraviolet curable adhesive sheet is a liquid crystal display panel, but the present invention is not limited to this.
- the second panel body may be a touch panel.
- the angle at which the test part is peeled is not particularly limited. Is called. That is, the test part may be peeled off by a method similar to a general peel test, and the cured state of the adhesive sheet may be grasped from the result.
- SYMBOLS 10 Liquid crystal display device, 11 ... Cover panel, 12 ... Liquid crystal display panel (2nd panel body), 12a ... Outer periphery of liquid crystal display panel 12, 13 ... Housing
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Abstract
Description
ところで、保護パネルと液晶表示パネルとの間で挟まれている紫外線硬化型接着剤が十分に硬化していないと、保護パネル又は液晶表示パネルの位置ずれや、保護パネル又は液晶表示パネルが紫外線硬化型接着剤から剥がれる等の問題が発生することがある。このような問題を確実に把握する等の目的で、上記のように紫外線を照射した後に、保護パネルと液晶表示パネルとの間で挟まれた紫外線硬化型接着剤の硬化状態を確認したい場合がある。
本発明に係るパネル積層体の製造方法は、光を透過する板材、及び前記板材の一方の板面における周縁側に枠状に形成され、光を遮る層状の遮光部を有する第1パネル体の前記板面に対し、未硬化状態で紫外線を受けると硬化する透明な紫外線硬化型接着剤からなるシートであって、前記遮光部の内側から露出する前記第1パネル体の前記板面を主として覆う本体部、及び前記本体部の周縁から外側に向かって延設され前記遮光部上に重ねられる試験部を有する接着シートの一方の面が、未硬化状態で貼り付けられる第1貼付工程と、第2パネル体の周縁から外側に前記試験部が露出し、前記第2パネル体と前記第1パネル体との間で前記本体部が挟まれるように、前記第2パネル体の一方の板面が、未硬化状態の前記接着シートにおける他方の面に貼り付けられる第2貼付工程と、前記第1パネル体及び前記第2パネル体で挟まれた前記接着シートに対して、紫外線が照射される照射工程と、前記試験部が前記本体部から分離するように、前記試験部が前記遮光部から剥離される剥離工程と、前記試験部の剥離時の状態に基づいて、前記接着シートの硬化状態が判別される判別工程と、を備える。前記パネル積層体の製造方法によれば、判別工程において、試験部の剥離時の状態に基づいて、接着シートの硬化状態を容易に判別することができる。
本発明によれば、紫外線硬化型接着剤を挟むようにパネル体同士を貼り合わせてパネル積層体を製造する際に、紫外線硬化型接着剤の硬化状態を容易に判別可能な技術を提供することができる。
本発明の実施形態1を、図1から図9を参照しつつ説明する。本実施形態では、液晶表示装置が備えるパネル積層体の製造方法、及び前記パネル積層体における硬化状態判別方法を例に挙げて説明する。
次いで、本発明の実施形態2を、図10を参照しつつ説明する。なお、以降の実施形態において、実施形態1と同じ部分は、実施形態1と同じ符号を付し、その詳細な説明は省略する。
次いで、本発明の実施形態3を、図11を参照しつつ説明する。図11は、実施形態3に係るパネル積層体16Bの平面図である。本実施形態のパネル積層体16Bの基本的な構成は、実施形態1と同様である。ただし、本実施形態のパネル積層体16Bが備える紫外線硬化型接着剤シート15Bにおいて、本体部15Baは実施形態1のものと同様であるものの、試験部15Bbの形状が実施形態1のものと異なっている。具体的には、試験部15Bbは、略円形状をなしている。
次いで、本発明の実施形態4を、図12を参照しつつ説明する。図12は、実施形態4に係るパネル積層体16Cの平面図である。本実施形態のパネル積層体16Cの基本的な構成は、実施形態1と同様である。ただし、本実施形態のパネル積層体16Cが備える紫外線硬化型接着剤シート15Cにおいて、本体部15Caは実施形態1のものと同様であるものの、試験部15Cbの形状が実施形態1のものと異なっている。具体的には、試験部15Cbは、略三角形状をなしている。
次いで、本発明の実施形態5を、図13を参照しつつ説明する。図13は、実施形態5に係るパネル積層体16Dの平面図である。本実施形態のパネル積層体16Dの基本的な構成は、実施形態1と同様である。ただし、本実施形態のパネル積層体16Dが備える紫外線硬化型接着剤シート15Dにおいて、試験部15Dbは、本体部15aに対して2個設けられている。なお、本体部15Daは実施形態1のものと同様である。つまり、本実施形態の外線硬化型接着剤シート15Dは、実施形態1の外線硬化型接着剤シート15に、更に試験部15Dbが追加された構成となっている。
本発明は上記記述及び図面によって説明した実施形態に限定されるものではなく、例えば次のような実施形態も本発明の技術的範囲に含まれる。
Claims (10)
- 光を透過する板材、及び前記板材の一方の板面における周縁側に枠状に形成され、光を遮る層状の遮光部を有する第1パネル体の前記板面に対し、未硬化状態で紫外線を受けると硬化する透明な紫外線硬化型接着剤からなるシートであって、前記遮光部の内側から露出する前記第1パネル体の前記板面を主として覆う本体部、及び前記本体部の周縁から外側に向かって延設され前記遮光部上に重ねられる試験部を有する接着シートの一方の面が、未硬化状態で貼り付けられる第1貼付工程と、
第2パネル体の周縁から外側に前記試験部が露出し、前記第2パネル体と前記第1パネル体との間で前記本体部が挟まれるように、前記第2パネル体の一方の板面が、未硬化状態の前記接着シートにおける他方の面に貼り付けられる第2貼付工程と、
前記第1パネル体及び前記第2パネル体で挟まれた前記接着シートに対して、紫外線が照射される照射工程と、
前記試験部が前記本体部から分離するように、前記試験部が前記遮光部から剥離される剥離工程と、
前記試験部の剥離時の状態に基づいて、前記接着シートの硬化状態が判別される判別工程と、を備えるパネル積層体の製造方法。 - 前記剥離工程は、前記試験部の剥離時におけるピール力が測定される工程を含み、
前記判別工程は、前記試験部の測定結果に基づいて、前記接着シートの硬化状態が判別される工程を含む請求項1に記載のパネル積層体の製造方法。 - 前記接着シートは、前記本体部と前記試験部との境界部分に、前記本体部と前記試験部との分離を誘導する分離誘導線を有し、
前記剥離工程において、前記分離誘導線に沿って前記試験部が前記本体部から分離される請求項1又は2に記載のパネル積層体の製造方法。 - 前記試験部のうち、前記本体部と接続する部分が、それの外側部分よりも細くなっている請求項1から3の何れか一項に記載のパネル積層体の製造方法。
- 前記試験部は、2個以上設けられている請求項1から4の何れか一項に記載のパネル積層体の製造方法。
- 前記第2パネル体は、液晶表示パネルからなる請求項1から5の何れか一項に記載のパネル積層体の製造方法。
- 前記第2パネル体は、タッチパネルからなる請求項1から5の何れか一項に記載のパネル積層体の製造方法。
- 光を透過する板材、及び前記板材の一方の板面における周縁側に枠状に形成され、光を遮る層状の遮光部を有する第1パネル体と、
第2パネル体と、
未硬化状態で紫外線を受けると硬化する透明な紫外線硬化型接着剤からなるシートであって、前記遮光部の内側から露出する前記第1パネル体の前記板面を覆う形で前記第1パネル体と前記第2パネル体との間で挟まれ、前記第1パネル体と前記第2パネル体とを互いに貼り合わせる接着シートと、を備えるパネル積層体における前記接着シートの硬化状態判別方法であって、
前記接着シートは、前記遮光部の内側から露出する前記第1パネル体の前記板面を主として覆う本体部と、この本体部の周縁から外側に向かって延設されると共に、前記第2パネルの前記周縁から外側に露出する形で前記遮光部上に貼り付けられる試験部とを有し、
前記本体部から分離するように前記試験部が前記遮光部から剥離され、その剥離状態に基づいて前記接着シートの硬化状態が判別される硬化状態判別方法。 - 前記試験部が前記遮光部から剥離される際に、前記試験部のピール力が測定され、前記試験部の測定結果に基づいて、前記接着シートの硬化状態が判別される請求項8に記載の硬化状態判別方法。
- 前記接着シートは、前記本体部と前記試験部との境界部分に、前記本体部と前記試験部との分離を誘導する分離誘導線を有し、
前記試験部が前記遮光部から剥離される際に、前記分離誘導線に沿って、前記試験部が前記本体部から分離される請求項8又は9に記載の硬化状態判別方法。
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