JP5155826B2 - Manufacturing method of display device - Google Patents

Manufacturing method of display device Download PDF

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JP5155826B2
JP5155826B2 JP2008293635A JP2008293635A JP5155826B2 JP 5155826 B2 JP5155826 B2 JP 5155826B2 JP 2008293635 A JP2008293635 A JP 2008293635A JP 2008293635 A JP2008293635 A JP 2008293635A JP 5155826 B2 JP5155826 B2 JP 5155826B2
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adhesive
surface
display panel
translucent substrate
liquid crystal
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JP2009175701A (en
JP2009175701A5 (en
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努 松平
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セイコーインスツル株式会社
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Priority claimed from US12/317,440 external-priority patent/US20090183819A1/en
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Publication of JP2009175701A5 publication Critical patent/JP2009175701A5/ja
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Description

  The present invention relates to a method for manufacturing a display device in which a light-transmitting substrate is attached to a display surface of a display device with a light-transmitting adhesive.

  On the display surface of the display panel, a cover glass for protecting the display surface and for shock resistance is installed. A display device in which a touch panel is installed instead of the cover glass is also known. However, if an air layer is interposed between the display panel and the cover glass or touch panel, light is reflected on the surface of the display panel, the lower surface of the cover glass or the touch panel, and the display surface becomes dark due to this reflection loss. It was. As a method for solving this, a method of filling a transparent adhesive having a refractive index close to the refractive index of glass between a display panel and a cover glass or a touch panel has been proposed. According to this structure, the reflection loss on the display side surface of the display panel and the display panel side surface of the cover glass can be reduced. Furthermore, since the cover glass and the display panel are integrated by an adhesive, there is an advantage that impact resistance is improved.

  Patent Document 1 describes a display device with a touch panel in which a transparent adhesive is filled between the touch panel and the display panel. The method of filling the transparent adhesive between the touch panel and the display panel is as follows. First, a transparent adhesive is applied with the back surface of the touch panel facing upward. Next, this is reversed to form a liquid dripping of the transparent adhesive. Next, the touch panel on which the dripping is formed is slowly dropped from above the display panel and bonded. When the translucent substrate is lowered, the tip of the liquid dripping made of the transparent adhesive comes into contact with the surface of the display panel, and the contact surface gradually spreads to the periphery. When filled in this way, bubbles can be prevented from being mixed into the transparent adhesive.

  FIG. 11A is a cross-sectional view illustrating a pasting method in which the protective glass substrate 61 is pasted on the liquid crystal panel 58 by the above method. The liquid crystal panel 58 includes an upper glass substrate 51, a lower glass substrate 52 attached so as to form a gap with a sealing material 54, a liquid crystal 53 sealed in the gap, and an end lower surface of the upper glass substrate 51. The IC 57 is mounted, an upper polarizing plate 55 attached to the outer surface of the upper glass substrate 51, and a lower polarizing plate 56 attached to the outer surface of the lower glass substrate 52. A backlight 59 is installed below the liquid crystal panel 58. A frame body 60 is installed around the liquid crystal panel 58, and an opening 65 is formed in the upper part of the frame body 60 so that the display surface of the liquid crystal panel 58 can be seen.

A liquid transparent adhesive 62 is applied to the surface of the protective glass substrate 61 bonded to the display surface side of the structure. A UV curable transparent adhesive is used as the transparent adhesive 62. The protective glass substrate 61 has a shape that is slightly larger than the opening 65 at the top of the frame 60, and overlaps the upper end 66 of the opening 65. The transparent adhesive 62 has a viscosity of 1000 to 6000 mPa · s, and dripping is formed when it is reversed. The protective glass substrate 61 is slowly lowered in the direction of the arrow, and the protective glass substrate 61, the upper end portion 66 of the frame 60, and the liquid crystal panel 58 are bonded together. When bonding, ultraviolet rays are irradiated.
Japanese Patent Laid-Open No. 9-274536

  FIG. 11B is a cross-sectional view illustrating a state in which the protective glass substrate 61, the upper end portion 66 of the frame body 60, and the liquid crystal panel 58 are bonded. FIG. 11C is a top view thereof. The plate thickness of the upper end portion 66 of the frame body 60 is about 0.3 mm. There is a gap of 0 mm to 0.3 mm between the upper end 66 and the upper surface of the upper polarizing plate 55 or the upper glass substrate 51. When there is a gap between the upper end portion 66 of the frame body 60 and the upper polarizing plate 55 or the upper glass substrate 51, the transparent adhesive 62 is interposed between the liquid crystal panel 58 and the frame body 60 as indicated by an arrow 63. There was a problem that it flowed out to reach the backlight 59 and maintenance of the backlight 59 and the like became impossible.

  Further, when the gap is formed between the upper end portion 66 of the frame body 60 and the upper polarizing plate 55 or the upper glass substrate 51, a gap 64 is formed at the tip end portion of the upper end portion 66. As shown in FIG. 11C, when the gap 64 is formed at the corner or right side of the opening 65 of the frame 60, the gap 64 is visible. Further, the volume of the transparent adhesive 62 shrinks when it is cured. When the volume of the transparent adhesive 62 contracts, tensile stress is applied to the display surface of the liquid crystal panel 58. For this reason, there has been a problem that the liquid crystal panel is warped and the thickness of the liquid crystal layer is uneven, resulting in uneven color.

  In order to solve the above-described problems, the present invention provides a display panel that is disposed on the inner side of a frame body having an opening at the upper part, close to the end of the opening of the frame, and then from the opening of the frame. The exposed surface of the exposed display panel was filled with the first adhesive to form a first adhesive layer. Since the first adhesive layer fills the step between the opening end of the frame and the surface of the display panel, it is possible to prevent a gap from being generated at the upper corner or corner of the frame. Next, the second adhesive is applied to the surface of the translucent substrate disposed outside the opening, and the translucent substrate to which the second adhesive is applied is applied to the lower surface of the application surface of the second adhesive. The second adhesive was cured by bonding to the upper surface of the display panel on which the first adhesive layer was formed. In this manner, the adhesive can be filled without introducing bubbles or voids between the upper surface of the display panel and the lower surface of the translucent substrate.

  Further, in the step of forming the first adhesive layer, the first adhesive layer was formed on the exposed surface of the display panel exposed from the opening of the frame body to a height substantially equal to the height of the upper surface of the opening end.

  Further, in the step of forming the first adhesive layer, the first adhesive is cured before the light-transmitting substrate is bonded. By curing the first adhesive before applying and curing the second adhesive, the stress on the display panel due to curing shrinkage can be reduced.

  Further, an adhesive dam is formed between the display panel and the frame before forming the first adhesive layer. Accordingly, it is possible to prevent the first adhesive from leaking out and dropping to the lower side of the side of the display panel and attaching the first adhesive to other elements.

  In the step of applying the second adhesive, the adhesive having a relatively high viscosity is applied to the adhesive having the relatively high viscosity.

  Moreover, the 1st adhesive agent and the 2nd adhesive agent were made into the range whose cure shrinkage rate is 1%-6%. Here, the first adhesive and the second adhesive were selected to have substantially the same refractive index after curing.

  First, a first adhesive layer made of a first adhesive is formed on the upper exposed surface of the display panel. Next, a second adhesive is applied to the surface of the translucent substrate, and the applied surface faces downward. The second adhesive was cured by bonding to the upper surface of the display panel on which the first adhesive layer was formed. This has the advantage that the adhesive can be filled without introducing bubbles or voids between the upper surface of the display panel and the lower surface of the translucent substrate.

  A method for manufacturing a display device according to the present invention will be described in the order of steps with reference to FIG. FIG. 1A is a schematic diagram showing an arrangement process. The frame 10 of the display device has an opening 11 at the top. The display panel 21 is installed close to the opening 11 inside the frame body 10. A gap may be provided between the opening end 12 of the frame 10 and the upper surface of the display panel 21 or may be brought into contact with each other. FIG. 1B is a schematic diagram showing the first adhesive layer forming step. The first adhesive layer 14 made of a translucent first adhesive is formed on the upper surface of the display panel 21 so as to exist up to the opening end of the frame 10. FIG.1 (c) is a schematic diagram showing a 2nd adhesive agent application process. A translucent second adhesive 17 is applied to the surface of the translucent substrate 16. The second adhesive 17 is applied to the surface of the translucent substrate 16 in a dot shape. For example, one point is applied to the center of the surface of the translucent substrate 16, or four points are further applied to the corners. The application amount of the second adhesive 17 is an amount that can be applied to the entire surface of the display panel 21 to a thickness of about 0.05 to 0.3 mm.

  FIG.1 (d) is a schematic diagram showing a bonding process. The translucent substrate 16 that is turned upside down is disposed above the first adhesive layer 14. At the time of arrangement, alignment between the translucent substrate 16, the display panel 21, and the frame 10 is performed. The second adhesive 17 forms a dripping due to the action of gravity. In this state, the translucent substrate 16 is slowly lowered. The lowering of the translucent substrate 16 is set to a speed that does not cause ripples on the surface of the liquid dripping. For example, it is lowered at a speed of 5 to 100 μm / sec. For example, when the viscosity of the second adhesive 17 to be used is 2000 to 3000 mPa · s, the descending speed is set to about 20 μm / sec. Then, the contact area between the second adhesive 17 and the first adhesive layer 14 is enlarged to fill the entire lower surface of the translucent substrate 16 with the second adhesive 17. FIG.1 (e) represents a 2nd adhesive agent hardening process. When a thermosetting adhesive is used as the second adhesive 17, it is heated. In the case of a UV curable adhesive, it is irradiated with ultraviolet rays, and when it is a visible light curable adhesive, it is irradiated with visible light and cured. To do.

  FIG. 2 shows a top view of the display device after the second adhesive curing step. The translucent substrate 16 is bonded to the inside of the frame 10, and the display surface of the display panel 21 can be seen from the opening 11. Since the step formed between the opening end 12 of the frame 10 and the surface of the display panel 21 is filled with the first adhesive or the step is reduced, the upper end corner or corner of the frame 10 is No gaps remain. In addition, by approximating the refractive indexes of the first adhesive layer 14 and the second adhesive 17 to the respective refractive indexes of the translucent substrate 16 and the display panel 21, the gap between the translucent substrate 16 and the display panel 21 is increased. Light reflection loss and light reflection loss between the first adhesive layer 14 and the second adhesive 17 can be reduced.

  In the display device manufacturing method, a flat display panel such as a liquid crystal panel, a plasma display panel, or an organic EL panel can be used as the display panel 21. Further, as the translucent substrate 16, a glass substrate for protecting the display surface, a transparent plastic substrate such as polycarbonate or acrylic, and a flat plate transparent substrate such as an input touch panel can be used. As the first adhesive and the second adhesive 17, a transparent adhesive such as a thermosetting adhesive, a UV curable adhesive, and a visible light curable adhesive can be used. The first adhesive and the second adhesive may be combined with different types of adhesives among the adhesives. As the frame 10, metal, plastic, ceramic, or the like can be used.

  In the first adhesive layer forming step, the first adhesive layer 14 is formed on the exposed surface of the display panel 21 exposed from the opening 11 of the frame 10 to a height substantially equal to the height of the upper surface of the opening end 12. . Thereby, since the level | step difference between the upper surface of the opening edge part 12 and the upper surface of the 1st contact bonding layer 14 is lose | eliminated, it has the advantage that the space | gap of the 2nd adhesive agent 17 becomes difficult to generate | occur | produce in this part.

  Further, by providing a double-sided tape between the upper surface of the display panel 21 and the open end 12 of the frame 10 before the first adhesive forming step, the open end 12 of the frame 10 and the surface of the display panel 21. An adhesive dam can be formed by closing the gap between the two. Thus, when the first adhesive is applied in the first adhesive layer forming step, the double-sided tape functions as a dam, so that the first adhesive is removed from the gap between the opening end 12 of the frame 10 and the display panel 21. It is possible to prevent the first adhesive from adhering to other elements due to leakage and dropping to the lower side of the display panel 21.

  Alternatively, an adhesive dam made of a third adhesive can be formed between the open end 12 of the frame 10 and the display panel 21 before the first adhesive layer forming step. Thereafter, a first adhesive is applied to the concave portion constituted by the adhesive dam and the exposed surface of the display panel 21. Thereby, when there is a gap between the opening end 12 of the frame 10 and the display panel 21, the first adhesive leaks from the gap and falls to the lower side of the side of the display panel 21 to other elements. It is possible to prevent the first adhesive from adhering. It is preferable to use an adhesive having substantially the same refractive index as the third adhesive forming the dam and the first adhesive applied to the exposed surface of the display panel 21. This is to prevent reflection of light from the interface. Further, the third adhesive is prevented from spreading on the surface of the display panel 21 when applied. Therefore, it is preferable that the viscosity of the third adhesive is about 40000 to 80000 mPa · s.

  Moreover, when forming the said adhesive agent dam with a 3rd adhesive agent, the upper end part of an adhesive agent dam is formed higher than the upper surface of the opening edge part 12. FIG. Thereby, since the side cross section of the opening edge part 12 is covered with a 3rd adhesive agent, it becomes difficult to generate | occur | produce a space | gap in the level | step-difference part when the 2nd adhesive agent 17 flows in in the subsequent bonding process. Further, when the outer shape of the translucent substrate 16 is larger than the outer shape of the opening 11, when the second adhesive 17 flows in, the second translucent substrate 16 is easily diffused outward, and the second adhesive is adhered to the entire lower surface of the translucent substrate 16. It becomes easy to fill the agent 17.

  Further, in the first adhesive layer forming step, the first adhesive can be cured before the bonding step of bonding the translucent substrate 16. Thereby, the stress by hardening shrinkage | contraction of the adhesive agent filled between the translucent board | substrate 16 and the display panel 21 can be reduced. It is also effective to use different curable adhesives such as a thermosetting adhesive for the first adhesive and a UV curable adhesive for the second adhesive.

  FIG. 3 is a schematic cross-sectional view of the display panel 21, the adhesive 28, and the translucent substrate 16 for explaining the stress due to curing shrinkage of the adhesive. FIG. 3A is a cross-sectional view showing a state where an adhesive 28 having a thickness T is filled between the display panel 21 and the translucent substrate 16. The adhesive 28 is not yet cured. FIG. 3B is a cross-sectional view showing a state where the adhesive 28 in FIG. 3A is cured. The adhesive 28 shrinks by a thickness δt due to cure shrinkage. The end portions of the display panel 21 and the translucent substrate 16 are fixed via the opening end portion 12 of the frame body 10. Therefore, a tensile stress 29 toward the adhesive 28 is generated on the upper surface of the display panel 21 and the lower surface of the translucent substrate 16. For example, when the display panel 21 is a liquid crystal panel, the liquid crystal panel is warped or the upper substrates of two substrates constituting the liquid crystal panel are pulled upward. As a result, the thickness of the liquid crystal layer changes and color unevenness occurs.

  3C to 3E are cross-sectional views for explaining a method for manufacturing a display device of the present invention. FIG. 3C shows a state where the first adhesive layer 14 formed on the display panel 21 in the first adhesive layer forming step is cured. When the first adhesive is a thermosetting adhesive, it is cured by heating, when it is a UV curable adhesive, it is cured by irradiating with ultraviolet rays, and when it is a visible light adhesive, it is visible. Curing by light irradiation. The thickness of the cured first adhesive layer 14 is T / 2. Even when curing shrinkage occurs in the first adhesive layer 14 during curing, no stress is applied to the lower display panel 21 because the upper surface is free.

  FIG. 3D shows a bonding process, in which the second adhesive 17 is filled between the first adhesive layer 14 and the translucent substrate 16. The second adhesive 17 is filled to a thickness T / 2, and T is the total thickness of the first adhesive layer 14 and the second adhesive 17. FIG. 3E shows a state where the second adhesive 17 is cured and curing shrinkage occurs. The cure shrinkage is δt / 2, which is half the cure shrinkage amount of FIG. 3 (b). That is, by first curing the previously applied adhesive, the stress applied to the display panel 21 due to curing shrinkage can be reduced. In addition, it is desirable that the curing shrinkage rate of the first adhesive and the second adhesive 17 is small. In the present invention, for example, even when an adhesive having a curing shrinkage rate in the range of 1% to 6% is used, the influence of stress on the display panel can be reduced.

  Further, in the second adhesive application step, an adhesive having a low viscosity can be applied after applying an adhesive having a relatively high viscosity to the translucent substrate 16. In the method for manufacturing a liquid crystal display device according to the present invention, a dripping made of an adhesive is formed on the translucent substrate 16 in the bonding step, and the adhesive is filled between the translucent substrate 16 and the display panel 21. However, the amount of adhesive used increases as the surface area of the display panel 21 increases. Therefore, a relatively high-viscosity adhesive is first applied to the surface of the translucent substrate 16, and then a low-viscosity adhesive from the above-mentioned adhesive is applied to expand the area where the adhesive is applied. . Specifically, an adhesive having a viscosity of 5000 to 10000 mPa · s is applied to the light-transmitting substrate 16, and then an adhesive having a viscosity of 1000 to 6000 mPa · s, preferably 2000 to 3000 mPa · s is applied. When the translucent substrate 16 is turned upside down, the dripping is mainly formed by a low-viscosity adhesive. In this way, by applying the adhesive in two stages, it is possible to affix the light-transmitting substrate 16 to the display panel 21 having a large area without mixing bubbles. In the present invention, the adhesive is not limited to two stages, and the adhesive can be applied in multiple stages. In this case, the viscosity of the adhesive applied last is made lower than the viscosity of the adhesive applied first.

  Hereafter, the manufacturing method of the display apparatus of this invention is demonstrated concretely using drawing. The same reference numerals are assigned to the same parts or parts having the same function. In the following embodiments, a liquid crystal panel is used as the display panel.

Example 1
A method of manufacturing the display device according to this embodiment will be described with reference to FIG. FIG. 4A shows a cross-sectional structure of the liquid crystal panel 8 and the frame body 10 and represents an arrangement process. In the liquid crystal panel 8, an upper substrate 1 and a lower substrate 2 made of glass are bonded to each other with a sealant 4 therebetween, and a liquid crystal layer 3 is formed in a gap therebetween. A TFT matrix array is formed on the inner surface of the upper substrate 1, and a color filter is formed on the inner surface of the lower substrate 2. The right side of the upper substrate 1 protrudes, and a driver IC 7 for driving the TFT array is mounted on the lower surface of the protrusion by COG. An upper polarizing plate 5 is attached to the outer surface of the upper substrate 1, and a lower polarizing plate 6 is attached to the outer surface of the lower substrate 2. A backlight 9 is installed below the liquid crystal panel 8. The liquid crystal panel 8 and the backlight 9 are installed in a housing (not shown), for example. The liquid crystal panel 8 has a display screen of several inches to 15 inches.

  The frame 10 is formed of a metal plate, has an opening 11 at the upper end, and is fixed to a housing (not shown) at the lower part. The opening 11 is partitioned by the opening end 12. The liquid crystal panel 8 is installed close to the opening end 12 of the frame 10. The end plate thickness of the open end 12 is about 0.3 to 0.6 mm. The tip of the open end 12 extends to a portion where the outer periphery of the upper polarizing plate 5 overlaps in a planar manner. The gap between the lower surface of the open end 12 and the upper surface of the upper polarizing plate 5 is greater than 0 mm and up to about 0.3 mm.

FIG. 4B is a cross-sectional view illustrating a state in which the first adhesive layer 14 is formed on the upper surface of the liquid crystal panel 8 and represents a first adhesive layer forming step. A first adhesive is applied to the upper surface of the liquid crystal panel 8. At this time, the adhesive is applied to the opening end 12. A UV curable transparent adhesive is used as the first adhesive. The viscosity of the first adhesive is 1000 to 6000 mPa · s. Next, the first adhesive is cured by irradiating 3000 to 10,000 mJ / cm 2 of ultraviolet rays. In the first adhesive layer 14, the upper surface 13 of the opening end portion 12 of the frame body 10 and the upper surface 15 of the first adhesive layer 14 have the same height. The unevenness of the upper surface of the first adhesive can be allowed up to about 100 μm, but is preferably 100 μm or less.

  FIG. 4C is a cross-sectional view showing a state in which the second adhesive 17 is applied to the upper surface of the translucent substrate 16 and represents a second adhesive application process. A glass substrate was used as the translucent substrate 16. As the second adhesive 17, a translucent UV curable adhesive was used. The viscosity of the second adhesive 17 is 1000 to 6000 mPa · s. When the viscosity of the second adhesive 17 is increased, it becomes difficult to form dripping when the translucent substrate 16 is inverted in the next bonding step, and when the viscosity is lowered, the amount of dripping is reduced and the liquid crystal panel is reduced. The amount of the second adhesive 17 to be filled between 8 and the translucent substrate 16 is insufficient.

  FIG. 4D shows a cross-sectional structure of the translucent substrate 16 with the surface on which the second adhesive 17 is applied above the liquid crystal panel 8 being the lower surface, and shows a bonding process. The translucent substrate 25 is turned upside down so that the second adhesive 17 is on the lower side. Then, the second adhesive 17 becomes a dripping shape due to gravity. In a state where the liquid dripping is formed, the translucent substrate 16 is lowered to the exposed surface of the liquid crystal panel 8. Then, the tip of the dripping makes point contact with the surface of the first adhesive layer 14. Thereafter, by further lowering the translucent substrate 16, the contact surface between the second adhesive 17 and the first adhesive layer 14 gradually expands. In this case, when the dripping made of the second adhesive 17 makes point contact with the first adhesive layer 14, the translucent substrate 16 is lowered at a lowering speed that does not cause ripples on the surface of the dripping. This is because if ripples occur, bubbles are mixed into the second adhesive 17. The second adhesive 17 is diffused over the entire lower surface of the translucent substrate 16. Since there is almost no step between the surface of the first adhesive layer 14 and the upper surface of the opening end portion 12, bubbles and voids are not mixed into the step portion. Note that the diameter of bubbles allowed in the adhesive filled between the liquid crystal panel 8 and the translucent substrate 16 is up to about 100 μm. Therefore, bubbles having a diameter smaller than 100 μm are not a problem.

FIG. 4E shows a cross-sectional structure in which the translucent substrate 16 is bonded to the upper portion of the liquid crystal panel 8 and represents a second adhesive curing step. After the second adhesive 17 is diffused over the entire lower surface of the translucent substrate 16, the second adhesive 17 is cured by irradiating ultraviolet rays. Ultraviolet rays are irradiated at 3000 to 10000 mJ / cm 2 . The hardness of the second adhesive 17 after curing is a type A hardness of 1 to 10. Accordingly, the hardness after curing has the property of rubber elasticity. If the hardness is too high, the upper polarizing plate 5 is peeled off or damaged against deformation due to thermal expansion or the like, and if the hardness is too low, the impact resistance of the liquid crystal panel 8 is lowered.

  In Example 1, the refractive indexes of the first adhesive layer 14 and the second adhesive 17 are approximated to the refractive indexes of the translucent substrate 16 and the upper polarizing plate 5. Therefore, an interface between the upper polarizing plate 5 and the first adhesive layer 14, an interface between the first adhesive layer 14 and the second adhesive 17, and between the second adhesive 17 and the translucent substrate 16. The reflection loss of light at the interface is reduced. For example, the refractive indexes of the first adhesive layer 14 and the second adhesive 17 are set to 1.45 to 1.55. Further, although a protective glass substrate is used as the translucent substrate 16, a plastic plate or a touch panel can be used instead. Further, instead of the UV curable adhesive, a thermosetting adhesive or a visible light curable adhesive can be used. Further, the first adhesive and the second adhesive 17 may be used in combination with different types of adhesives among the UV curable adhesive, the thermosetting adhesive, and the visible light curable adhesive.

(Example 2)
A method of manufacturing the display device according to this example will be described with reference to FIGS. FIG. 5A shows a cross-sectional structure of the liquid crystal panel 8 and the backlight 9 and shows an arrangement process. The liquid crystal panel 8 is the same as that shown in FIG. FIG. 5B is a cross-sectional view illustrating a state where the double-sided tape 19 is attached to the upper surface of the upper substrate 1 of the liquid crystal panel 8. The double-sided tape is attached to the outer periphery of the upper surface of the upper substrate 1 of the liquid crystal panel 8. FIG. 5C is a cross-sectional view showing a state in which the upper substrate 1 of the liquid crystal panel 8 and the frame body 10 are bonded together by the double-sided tape 19. The double-sided tape 19 functions as a dam so that the adhesive does not leak from the gap between the frame 10 and the liquid crystal panel 8 when the second adhesive is applied.

  Next, a first adhesive layer 14 is formed by applying a first adhesive to a recess formed by the double-sided tape 19, the opening end 12 and the upper surface of the liquid crystal panel 8. FIG. 5D is a cross-sectional view schematically showing a state in which the first adhesive layer 14 is formed, and a step of applying the first adhesive in the first adhesive layer forming step to form the first adhesive layer. Represents. The viscosity of the first adhesive is 1000 to 6000 mPa · s. The height of the upper surface 15 of the first adhesive and the height of the upper surface 13 of the frame 10 when the first adhesive is applied are approximately the same. The first adhesive applied to the surface of the liquid crystal panel 8 is blocked by the double-sided tape 19 and does not leak out to the lower part of the side surface. The unevenness on the surface of the first adhesive is preferably 100 μm or less. After applying the first adhesive, the first adhesive layer 14 is cured by irradiating with ultraviolet rays 20. FIG. 6E is a cross-sectional view schematically showing a state in which the first adhesive layer 14 is cured by irradiating the first adhesive layer 14 with ultraviolet rays 20, and the first adhesive layer forming process includes a first step. It represents the curing process of the adhesive. As described above, in the first adhesive layer forming step, the first adhesive layer 14 is formed by applying the first adhesive, and the first adhesive layer 14 is irradiated with the ultraviolet rays 20 to irradiate the first adhesive layer 14. A step of curing.

  FIG. 6F is a cross-sectional view illustrating a state where the second adhesive 17 is applied to the surface of the translucent substrate 16 and illustrates a second adhesive application process. The second adhesive 17 has a viscosity of 1000 to 6000 mPa · s, and the refractive index is approximately the same as that of the first adhesive. FIG. 6G is a cross-sectional view of a state in which the translucent substrate 16 is turned upside down and bonded onto the liquid crystal panel 8 and represents a bonding process. The translucent substrate 16 is slowly lowered, the tip of the second adhesive dripping is brought into point contact with the surface of the first adhesive layer 14, and the contact surface is gradually enlarged. The descending speed of the translucent substrate 16 is set to a speed that does not cause ripples on the surface of the liquid dripping. The second adhesive 17 is diffused over the entire lower surface of the translucent substrate 16. FIG. 6H is a cross-sectional view illustrating a curing process for curing the second adhesive 17. This is the same as FIG. 4 (e), and the description is omitted.

  Since the curing of the first adhesive layer 14 and the curing of the second adhesive 17 are performed in separate steps, a thermosetting adhesive is used for the first adhesive layer 14 and the second adhesive 17 is used. It is also possible to use a combination of different curable adhesives such as a UV curable adhesive.

  Moreover, in this invention, although the double-sided tape was affixed on the liquid crystal panel 8 side, you may affix a double-sided tape on the frame 10 side.

(Example 3)
A method of manufacturing the display device according to this example will be described with reference to FIGS. FIG. 7A is a cross-sectional view in which the liquid crystal panel 8 is disposed in the vicinity of the opening end 12 of the frame body 10 and represents an arrangement process. This is the same as FIG. 4A of the first embodiment, and the description is omitted. FIG. 7B is a cross-sectional view showing a state where an adhesive dam 18 made of a third adhesive is formed between the opening end 12 and the upper surface of the upper polarizing plate 5 of the liquid crystal panel 8. As the third adhesive, a UV curable adhesive having a viscosity of 10,000 to 50,000 mPa · s was used. The adhesive dam 18 prevents the adhesive from leaking through the gap between the frame 10 and the liquid crystal panel 8 when the first adhesive is applied. The adhesive dam 18 is formed so as to cover at least the open end 12. The upper end portion of the adhesive dam 18 is preferably formed higher than the upper surface 13 of the frame body 10. More preferably, the upper end portion of the adhesive dam 18 is made approximately 0.1 mm higher than the upper surface 13 of the frame body 10. Thereby, in the bonding process of the translucent substrate 16, the second adhesive can be filled on the entire lower surface of the translucent substrate 16.

  Next, the first adhesive layer 14 is formed by applying the first adhesive to the recess formed by the adhesive dam 18 and the upper surface of the liquid crystal panel 8. FIG.7 (c) is sectional drawing which shows typically the state in which this 1st contact bonding layer 14 was formed. The viscosity of the first adhesive layer 14 is 1000 to 6000 mPa · s. The height of the upper surface 15 of the first adhesive and the height of the upper surface 13 of the frame 10 when the first adhesive is applied are approximately the same. The first adhesive applied to the surface of the liquid crystal panel 8 is blocked by the adhesive dam 18 and does not leak downward. The unevenness on the surface of the first adhesive is preferably 100 μm or less. After the first adhesive is applied, ultraviolet rays are irradiated to cure the adhesive dam 18 and the first adhesive, thereby forming the first adhesive layer 14. The refractive index of the adhesive dam 18 and the first adhesive 14 have the same refractive index. This prevents light from reflecting from the boundary.

  FIG. 7D is a cross-sectional view illustrating a state in which the second adhesive 17 is applied to the surface of the translucent substrate 16 and illustrates a second adhesive application process. The second adhesive 17 has a viscosity of 1000 to 6000 mPa · s, and the refractive index is approximately the same as that of the first adhesive.

  FIG. 8E is a cross-sectional view showing a state in which the translucent substrate 16 is turned upside down and bonded onto the liquid crystal panel 8 and represents a bonding step. The translucent substrate 16 is slowly lowered, the tip of the second adhesive dripping is brought into point contact with the surface of the first adhesive layer 14, and the contact surface is gradually enlarged. The descending speed of the translucent substrate 16 is set to a speed that does not cause ripples on the surface of the liquid dripping. The second adhesive 17 gradually expands the contact area and reaches the adhesive dam 18. Depending on the amount and viscosity of the second adhesive 17, the diffusion of the second adhesive 17 stops at the adhesive dam 18 or diffuses over the entire lower surface of the translucent substrate 16. FIG. 8F is a cross-sectional view showing a curing process for curing the second adhesive 17. This is the same as FIG. 4 (e), and the description is omitted.

Example 4
A method of manufacturing the display device according to this example will be described with reference to FIG. The present embodiment includes a step of applying the second adhesive 17 to the surface of the translucent substrate 16 twice in the second adhesive application step. Since other arrangement | positioning processes, a 1st contact bonding layer formation process, a bonding process, and a 2nd adhesive agent hardening process are the same as that of Examples 1-3, description is abbreviate | omitted.

  FIG. 9A is a cross-sectional view illustrating a state in which a relatively high-viscosity first-layer second adhesive 17 is applied to the surface of the translucent substrate 16. As the second adhesive 17 of the first layer, a UV effect type adhesive having a viscosity of 5000 to 10000 mPa · s was used. FIG. 9B is a cross-sectional view showing a state in which the second adhesive 17 ′ of the second layer having a relatively low viscosity is applied on the second adhesive 17 of the first layer. The second layer second adhesive 17 ′ is made of the same UV effect adhesive as the first layer second adhesive 17 and has a viscosity of 1000 to 6000 mPa · s. FIG. 9C shows a state of dripping of the second adhesive 17 ′ when the translucent substrate 16 is turned upside down. Mainly, the second adhesive 17 'in the second layer forms a dripping.

  As described above, the coating method in which the first layer has the high viscosity and the second layer has the low viscosity second adhesive 17 is suitable for bonding the translucent substrate 16 having a large area. The first layer of the second adhesive 17 is applied to the surface relatively widely, and the second layer of the second adhesive 17 ′ forms a dripping. Bubbles are prevented from forming by forming a dripping. In addition, this invention is not limited to the 2nd application of the 2nd adhesive agent 17, 3 times application | coating may be sufficient and it may be applied many times. In that case, the viscosity of the second adhesive 17 to be applied last is set to be lower than that of the previously applied second adhesive, for example, 1000 to 6000 mPa · s.

(Example 5)
FIG. 10 is an explanatory diagram for explaining a manufacturing method of the display device according to the present embodiment, and represents a second adhesive application step. Since the arrangement step, the first adhesive layer forming step, the bonding step, and the second adhesive curing step are the same as those in Examples 1 to 3, description thereof is omitted.

  FIG. 10A is a top view of the translucent substrate 16 and shows a state in which the second adhesive 17 is applied to five locations. FIG. 10B shows a state where the island-like second adhesive 17 applied to five locations is further applied so as to tie the letter X radially. FIG. 10C shows a state where the translucent substrate 16 is turned upside down. Liquid dripping is formed at a plurality of locations. Then, the translucent substrate 16 is slowly lowered so that the tip of the liquid dripping comes into point contact with the surface of the liquid crystal panel 8, and the contact surface is expanded over the entire surface. As a result, the large-area translucent substrate 16 can be attached to the large-area liquid crystal panel 8 without taking in bubbles. In the present invention, the second adhesive 17 is not limited to five places, and may be applied to many places.

  As described above, in the first to fifth embodiments, a plasma display panel, an organic EL display panel, and other flat panels can be used instead of the liquid crystal panel 8. Moreover, a plastic board, a touch panel, etc. can be used for the translucent board | substrate 16 instead of protective glass. Moreover, a thermosetting adhesive or a visible light curable adhesive can be used in place of the UV adhesive. The first adhesive and the second adhesive can be used in combination with the different adhesives.

It is explanatory drawing which showed the manufacturing method of the display apparatus which concerns on this invention in process order. It is a top view of the display apparatus manufactured by the manufacturing method of this invention. It is explanatory drawing for demonstrating the cure shrinkage of an adhesive agent. It is explanatory drawing which showed the manufacturing method of the display apparatus which concerns on this invention in process order. It is explanatory drawing which showed the manufacturing method of the display apparatus which concerns on this invention in process order. It is explanatory drawing which showed the manufacturing method of the display apparatus which concerns on this invention in process order. It is explanatory drawing which showed the manufacturing method of the display apparatus which concerns on this invention in process order. It is explanatory drawing which showed the manufacturing method of the display apparatus which concerns on this invention in process order. It is explanatory drawing explaining the 2nd adhesive agent coating process of the manufacturing method which concerns on this invention. It is explanatory drawing explaining the 2nd adhesive agent coating process of the manufacturing method which concerns on this invention. It is sectional drawing and the top view of the display apparatus by a conventionally well-known manufacturing method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper substrate 2 Lower substrate 3 Liquid crystal layer 4 Sealing material 5 Upper polarizing plate 6 Lower polarizing plate 8 Liquid crystal panel 10 Frame 14 First adhesive 16 Translucent substrate 17 Second adhesive

Claims (4)

  1. Inside the frame body having an open mouth, so as to expose the display panel from the opening, as engineering you place the display panel and,
    The exposed surface of the display panel that is exposed from the opening of the frame, and supplying the first adhesive,
    Curing the first adhesive to form a first adhesive layer;
    Providing a second adhesive surface of the transparent substrate,
    The light-transmitting substrate, wherein the second adhesive is applied, the coated surface of the second adhesive so as to become lower, Ru bonding the upper surface of the display panel, wherein the first adhesive layer is formed and as Engineering,
    Method for manufacturing a display device and a curing step of curing the second adhesive.
  2. The method for manufacturing a display device according to claim 1, wherein, in the curing step, the second adhesive is filled over the entire lower surface of the translucent substrate.
  3. The method for manufacturing a display device according to claim 1, wherein the first adhesive layer is formed at a height equal to a height of an upper surface of the frame body.
  4. Before the step of supplying the first adhesive , a step of forming an adhesive dam for preventing the first adhesive from leaking to the lower side surface between the frame and the display panel is provided. The manufacturing method of the display apparatus as described in any one of Claims 1-3.
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