JP2014026293A - Method for manufacturing display panel and display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a display panel, by which contamination caused by an outflow of an adhesive for adhering a display element to an optical member can be reliably and easily prevented, the manufacturing man-hour can be significantly reduced, and space saving and a simplified configuration can be achieved, and to provide a display panel.SOLUTION: The method for manufacturing a display panel comprising a display element 10 and an optical member 20 adhered to the display element includes: a first adhesive application step of applying a first adhesive 30 having fluidity in an uncured state to the display element 10 and defining an application region Ar1 for a second adhesive 40 by the first adhesive 30; a first adhesive curing step of curing the first adhesive 30 to form a flow stopper part 31 adhering to the coated surface; a second adhesive application step of applying the second adhesive 40 having fluidity in an uncured state on the application region Ar1; a bonding step of bonding the display element 10 with the optical member 20 via the second adhesive 40; and a second adhesive curing step of curing the second adhesive 40 to adhere the display element 10 with the optical member 20.

Description

  The present invention relates to a manufacturing method of a display panel used for, for example, a liquid crystal display, an organic EL display, a plasma display, electronic paper, and the like, and a display panel manufactured by this method, and in particular, a display element and an optical member are bonded. The present invention relates to a display panel manufacturing method and a display panel that can reliably and easily prevent contamination due to the outflow of an adhesive.

  As a conventional method for manufacturing a display panel, for example, there is one disclosed in JP 2008-129159 A (Patent Document 1). As shown in FIG. 2, the display panel manufacturing method includes a step of placing a frame member 10 cut from a sheet of ultraviolet curable resin on a protective plate 7, and an ultraviolet curable product inside the frame member 10. 11, a step of covering the protective plate 7 with the image display panel 6 (display element), an ultraviolet ray from both sides of the protective plate 7 and the image display panel 6, and the inside of the frame member 10 and the frame member 10. And the step of curing the ultraviolet-cured product 11 protruding outside.

  In such a conventional display panel manufacturing method, the frame material 10 is interposed, thereby suppressing the excessive spread of the ultraviolet-cured product 11 and adjusting the thickness of the frame material 10, The distance from the image display panel 6 was adjusted.

JP 2008-129159 A ([0027], [0028], [FIG. 2])

  In the above-described conventional display panel manufacturing method, in addition to the above-described step of bonding the protective plate 7 and the image display panel 6, a step of forming a sheet by previously curing an ultraviolet curable resin in a mold, and this sheet A step of cutting the frame material 10 from and a step of positioning and arranging the cut frame material 10 on either the protective plate 7 or the image display panel 6, and a great deal of labor for forming the frame material 10 separately. There was a problem of taking time. As a practical problem, display panels to be manufactured include a plurality of types of product lines with different dimensions and shapes, and a dedicated frame member 10 has to be prepared for each type of display panel.

  Further, in the conventional display panel manufacturing method described above, the frame material 10, which is a separate component, must be bonded to the plate surface of the protection plate 7 or the image display panel 6 ([Example 1] [ 0034]), it is extremely difficult to adhere the thin film frame member 10 to a predetermined position on the plate surface without looseness or wrinkles, the adhesion between the plate surface and the frame member 10 is poor, and the ultraviolet cured product 11 is There was also a problem of leakage. For this reason, in the conventional display panel manufacturing method described above, it is assumed that the ultraviolet cured product 11 protrudes outside the frame member 10, and ultraviolet rays are irradiated not only from the protective plate 7 side but also from the image display panel 6 side. The ultraviolet-cured product 11 that protruded outside the frame member 10 had to be cured. Thus, since it presupposes that the ultraviolet cured material 11 protrudes to the outer side of the frame material 10, after assembling the image display panel 6 to a case, it cannot irradiate with ultraviolet rays from the image display panel 6 side, There is also a problem that the uncured ultraviolet cured product 11 that protrudes outside the frame member 10 contaminates the case and peripheral components such as an optical film, a light guide plate, and a backlight housed in the case.

  Furthermore, the frame member 10 requires a minimum strength for handling such as moving on the plate surface of the protective plate 7 or the image display panel 6 and spreading and positioning on the plate surface. This strength was ensured by setting it relatively large (in Example 1 [0034], the width was 10 mm). For this reason, there is a problem that the area occupied by the frame member 10 is large, and it is not possible to cope with the space saving associated with the recent expansion of the display area of the display panel.

  The present invention has been made in view of the above problems, and can reliably and easily prevent contamination due to the outflow of the adhesive that bonds the display element and the optical member, greatly reducing manufacturing man-hours and savings. It is an object of the present invention to provide a display panel manufacturing method and a display panel that can achieve space saving and configuration simplification.

  In order to achieve the above object, a first display panel manufacturing method of the present invention is a display panel manufacturing method in which an optical member is bonded to a display element, and at least one of the display element or the optical member, By applying a first adhesive having fluidity when uncured, defining a second adhesive application region by the first adhesive, and curing the first adhesive; A first adhesive curing step for forming a flow stop portion that adheres to the application surface; a second adhesive application step for applying the second adhesive having fluidity when uncured to the application region; A bonding step of bonding the display element and the optical member through two adhesives, and a second adhesive curing step of curing the second adhesive to bond the display element and the optical member. is there.

  According to such a method, it is possible to form the second adhesive flow-stopping portion very simply by simply applying and curing the uncured first adhesive on at least one of the display element or the optical member. It is possible to reliably prevent the second adhesive from flowing out from the application region defined by the flow stop portion.

  Further, the first adhesive adheres to the application surface without gaps due to the fluidity when uncured, and the flow-stopping portion obtained by curing the first adhesive is firmly bonded to the application surface without gaps. Thereby, by optimizing the application amount of the second adhesive to the application area, the second adhesive does not leak out from the flow stop portion and can be reliably prevented from being contaminated by the second adhesive. it can.

  Furthermore, the first adhesive forming the flow stop portion can be applied in any range, shape, width, and thickness depending on the fluidity when uncured, and different sizes and shapes of multiple types of display panels. In addition, it is possible to flexibly cope with space saving accompanying expansion of the display area of the display panel.

  Here, the “display panel” includes, for example, a “display element” and its peripheral components constituting a display device such as a liquid crystal display, an organic EL (Electro Luminescence) display, a plasma display, and electronic paper. The “display element” is a substrate-like component that displays images, characters, and the like, and includes, for example, a liquid crystal display element, an EL display element, a plasma display element, an electrophoretic display element, and the like. In addition, the “optical member” that adheres to the display element widely includes those that are adhered to the front or back surface of the display element. For example, glass, acrylic resin, polycarbonate resin, polyester resin, PET resin, cycloolefin polymer resin Alternatively, it includes a substrate, a sheet, a film-like component made of a cycloolefin copolymer resin or the like and has optical functions such as scratch prevention, polarization, diffusion, and antiglare, and an input device such as a touch panel.

  Furthermore, for the “first adhesive” and “second adhesive”, various adhesives that have fluidity when uncured and have good translucency and a stable refractive index when cured are used. Is possible. In addition, when providing a flow stop part in positions other than the display area of a display panel (for example, the position corresponding to the light-shielding part mentioned later), optical performance, such as translucency and refractive index of a 1st adhesive agent, is unnecessary. . Further, the “first adhesive” and the “second adhesive” widely include adhesives that have fluidity at the time of application and are cured after application, for example, photo-curing type, heat-curing type, moisture-curing type, hot An adhesive that cures by mixing melt and two or more liquids is included.

  In order to achieve the above object, a second display panel manufacturing method of the present invention is a display panel manufacturing method in which an optical member is bonded to a display element assembled to a case, and the display element is assembled to the case. A first adhesive having fluidity when uncured is applied to the inside of the assembly step and the boundary between the case and the display element in at least one of the display element or the optical member, and the first adhesive A first adhesive application step that defines an application region of the second adhesive, and a first adhesive curing step that forms a flow stop portion that adheres to the application surface by curing the first adhesive; A second adhesive application step of applying the second adhesive having fluidity when uncured to the application region, and a bonding step of bonding the optical member to the display element via the second adhesive; Said The adhesive is cured are to include a second adhesive curing step of bonding the display element and the optical member.

  According to such a method, the same effects as those of the first display panel manufacturing method described above can be achieved, and in the second adhesive application step or the bonding step described above, the uncured second adhesive is a case. And prevents contamination of peripheral parts such as optical films, light guide plates, and backlights stored in the case without flowing into the case through gaps, holes, openings, etc. It becomes possible to do.

  Preferably, in the first and second display panel manufacturing methods described above, the optical member has a light shielding portion, and at least the second adhesive is a photocurable adhesive, and the display element or the optical member The flow stop portion is formed at a position corresponding to the light shielding portion in at least one of the above.

  According to such a method, it is possible to prevent the uncured second adhesive from flowing out to a position corresponding to the light-shielding portion of the optical member by the flow stop portion made of the first adhesive. Thereby, even when a photocurable adhesive is used for the second adhesive, it is possible to cure the second adhesive by irradiating light from the optical member side, and the case of the uncured second adhesive Contamination can be prevented.

  Preferably, in the first and second display panel manufacturing methods described above, the viscosity of the first adhesive is made higher than the viscosity of the second adhesive, and the first adhesive is used as the case and the display element. The boundary is sealed by the flow stop portion by being cured after being applied along the boundary.

  According to such a method, the gap formed at the boundary between the case and the display element can be sealed by the flow stop portion made of the first adhesive, and the uncured second adhesive can be removed from the application region. Outflow can be prevented, and contamination in the case due to the uncured second adhesive can be more reliably prevented.

  Preferably, in the first and second display panel manufacturing methods described above, the thickness of the flow stopping portion is equal to or less than the thickness of the second adhesive.

  According to such a method, the flow stopping portion does not hinder the adhesion between the display element or the optical member and the uncured second adhesive, and thereby the second adhesive application step or the bonding step described above. In this case, it is possible to prevent air bubbles from entering between the display element and the optical member and to form a gap, and it is possible to bond the entire surface of the display element and the optical member with the cured second adhesive.

  Preferably, in the first and second display panel manufacturing methods described above, the first and second adhesives are made of the same material having the same light transmittance and refractive index.

  According to such a method, in the manufacturing process of the display panel, in the above-described second adhesive application step, the first adhesive forms the second adhesive flow-stop portion. In the process, after the second adhesive is cured and integrated with the flow stopper, both become a single adhesive having the same optical properties. As a result, even when the flow stopper extends over the display area of the display element, it is possible to extremely reduce the influence on the visibility of images and the like.

  Here, “the same material” means that the first and second adhesives are at least “light transmittance and refractive index are equal”, and “light transmittance and refractive index are equal”. For example, even if the first and second adhesives have different viscosities, they are included in the “same material” here.

  In order to achieve the above object, a third display panel manufacturing method of the present invention is a display panel manufacturing method in which an optical member is bonded to a display element, and at least one of the display element or the optical member, A flow stopping portion forming step of applying a resin material having a high viscosity of about 200,000 to 1,000,000 mPa · s at normal temperature to form a flow stopping portion, and demarcating an application area of the adhesive by the flow stopping portion, An adhesive application step of applying an adhesive having fluidity when uncured to the application region, a bonding step of bonding the optical member to the display element via the adhesive, and curing the adhesive. An adhesive curing step for adhering the display element and the optical member.

  According to such a method, it is possible to form a flow preventive portion of an adhesive having fluidity simply by applying a resin material having a high viscosity of about 200,000 to 1,000,000 mPa · s at room temperature. In comparison with the first and second display panel manufacturing methods, the step of curing the resin material can be omitted.

  Preferably, in the above-described third display panel manufacturing method, high-viscosity grease mainly containing perfluoropolyether is used as the resin material.

  The high-viscosity grease containing perfluoropolyether as a main component has a carbon-fluorine bond and is excellent in chemical stability and inactive. When the flow stop is formed with such high viscosity grease, the flow stop exhibits high heat resistance in air and chemical resistance to adhesives, and corrodes, swells, deteriorates, or dissolves against display elements and optical members. There is no adverse effect. Furthermore, it is possible to impart optical performance such as translucency in a wide wavelength range and low refractive index to the flow stopper.

  In order to achieve the above object, the display panel of the present invention has a structure manufactured by any one of the first to third display panel manufacturing methods described above, and the first or second display panel described above. The same operational effects as those of the manufacturing method are obtained.

  As described above, according to the display panel manufacturing method and the display panel of the present invention, it is possible to reliably and easily prevent contamination due to the outflow of the adhesive that bonds the display element and the optical member, and the manufacturing man-hours are greatly increased. Reduction, space saving, and simplification of the configuration can be achieved.

The display panel which concerns on 1st Embodiment of this invention is shown, The figure (a) is a top view, The figure (b) is AA sectional drawing of the figure (a), The figure (c) is the same. It is the elements on larger scale of figure (b). The display panel which concerns on 2nd Embodiment of this invention is shown, The same figure (a) is a top view, The same figure (b) is BB sectional drawing of the same figure (a), The same figure (c) is the same. It is the elements on larger scale of figure (b). It is a flowchart which shows each process of the manufacturing method of the display panel which concerns on 1st Embodiment of this invention. FIGS. 3A to 3G are schematic views showing each step of FIG. It is a flowchart which shows each process of the manufacturing method of the display panel which concerns on 2nd Embodiment of this invention. FIGS. 4A to 4F are schematic views showing each step of FIG. It is a flowchart which shows each process of the manufacturing method of the display panel which concerns on 3rd Embodiment of this invention.

  Hereinafter, a method for manufacturing a display panel of the present invention and an embodiment of a display panel manufactured by this method will be described with reference to the drawings.

[Display Panel According to First Embodiment]
First, the configuration of the display panel according to the first embodiment of the present invention will be described with reference to FIGS. 1A and 1B show a display panel according to a first embodiment of the present invention. FIG. 1A is a plan view, FIG. 1B is a cross-sectional view taken along the line A-A in FIG. c) is a partially enlarged view of FIG.

  1 (a) and 1 (b), a display panel 1 according to the present embodiment constitutes a liquid crystal display, and mainly includes a display element for displaying images, characters and the like, a case, and a periphery constituting a backlight. It consists of parts. More specifically, the display panel 1 has a substrate-like, sheet-like, or film-like optical member 20 on the surface of the display element 10 that displays images, characters, and the like via first and second adhesives 30, 40. It is configured to be bonded and assembled to the case 50. In the case 50, a light source 61, a light guide plate 62, and an optical film 63 that constitute a backlight of the display element 10 are housed.

  The backlight components 61 to 63 exemplify peripheral components in the case 50 to be protected from contamination by the second adhesive 40, and the display panel and the manufacturing method thereof according to the present invention include a backlight. It is also possible to apply to an unnecessary display device, for example, a display panel used for an organic EL display, a plasma display, electronic paper or the like.

  The display element 10 is a liquid crystal display element in this embodiment, and has a configuration in which a liquid crystal composition is sealed between two glass substrates having transparent electrodes. The optical member 20 is made of, for example, an optical functional material for the purpose of scratch prevention, polarization, diffusion, glare prevention, scattering prevention, and the like, and has a light-transmitting property (ex. Transparent, translucent, milky white, etc.). It is a film-like part. Examples of the optical functional material constituting the optical member 20 include glass, acrylic resin, polycarbonate resin, polyester resin, PET resin, cycloolefin polymer resin, and cycloolefin copolymer resin. The optical member 20 may be an input device such as a touch panel.

  Here, the black light-shielding part 21 is printed in the peripheral part of the back surface of the optical member 20 of this embodiment. The light shielding portion 21 blinds the gap G formed at the boundary between the display element 10 and the case 50 shown in FIGS. 5A and 5C, and the illumination light of the backlight leaks out from the gap G. It is for not to be.

  Between the display element 10 and the optical member 20, the first and second adhesives 30 and 40 described above are interposed. Each of the first and second adhesives 30 and 40 has fluidity when uncured and has a property of curing after application. As these 1st and 2nd adhesives 30 and 40, the adhesive which hardens | mixes a photocurable type | mold, a thermosetting type | mold, a moisture hardening type | mold, a hot melt, and 2 liquids or more can be used, for example. In the present embodiment, an ultraviolet curable adhesive is used as the first and second adhesives 30 and 40. The application process and the curing process of these first and second adhesives will be described in detail later with reference to FIGS.

  The first adhesive 30 is applied to the surface peripheral portion of the display element 10 and at a position corresponding to the light shielding portion 21 in a stage before applying the second adhesive 40, and the second adhesive is applied to the surface of the display element 10. Forty application areas Ar1 are defined. The first adhesive 30 applied to the display element 10 is cured by subsequent ultraviolet irradiation to form the flow stop portion 31 of the second adhesive 40. The anti-flow portion 31 cured with the ultraviolet curable adhesive is firmly bonded to the entire surface of the display element 10 without a gap. As a result, the uncured second adhesive 40 applied to the application region Ar <b> 1 inside the flow stopper 31 does not flow out to the outside of the flow stopper 31.

  The thickness of the flow stopper 31 is set to be equal to or less than the thickness of the second adhesive 40 applied thereafter. As a result, the flow preventing portion 31 moves between the display element 10 and the optical member 20 without hindering the close contact between the optical member 20 bonded to the surface of the display element 10 and the uncured second adhesive. Intrusion of bubbles and formation of gaps are prevented.

  In the present embodiment, since the flow stopper 31 is formed at a position corresponding to the light shield 21 (see “light-shielding region Ar2” in FIG. 1C), the flow stopper 31 is not included in the display panel 1. It has no effect on the visibility. For this reason, the first adhesive 30 that is the material of the flow stopper 31 is not particularly required to have optical performance such as translucency and refractive index.

  The second adhesive 40 is for adhering the display element 10 and the optical member 20, and is applied to the application region Ar1 defined by the flow stop portion 31 (first adhesive 30). In this embodiment, since the application area Ar1 of the second adhesive 40 substantially coincides with the display area of the display element 10, the second adhesive 40 has good translucency and a stable refractive index when cured. Cost.

  The second adhesive 40 is applied to the entire application region Ar1, and is sandwiched between the display element 10 and the optical member 20 in an uncured state. Thereafter, the display element 1 and the optical member 20 are bonded together by receiving and curing the ultraviolet rays irradiated from the display element 1 side.

  In addition, as a peripheral component of the display panel 1, the case 50 is a resin box, and the light source 61, the light guide plate 62, and the optical film 63 constituting the backlight are housed therein, and a display is provided in the opening. The element 10 is assembled. Actually, when the display element 10 is assembled in the opening of the case 50, a minute gap G is formed at the boundary between the two. In the display panel 1 of the present embodiment, the uncured second adhesive 40 is prevented from flowing into the gap G by forming the above-described flow stop portion 31.

  Moreover, as the light source 61 which comprises a backlight, a cold cathode tube, LED (Light Emitting Diode), etc. can be used, for example. In this embodiment, the light source 61 is disposed at one end of the light guide plate 62, and the edge light method in which the linear light from the light source 61 is converted into planar light by the light guide plate 62 is exemplified. The main purpose of the present invention is to prevent the uncured second adhesive 40 from flowing out, so the backlight method is not limited to the edge light method. For example, a direct type system in which the light source 61 is arranged directly below a diffusion plate (not shown) may be employed. The optical film 63 is, for example, a light diffusing film that uses planar light emitted from the light guide plate 62 as a more uniform surface light source.

  According to the display panel 1 of the present embodiment having the above-described configuration, the uncured second adhesive is provided by providing the flow blocking portion 31 in which the first adhesive 30 is cured in advance in the light shielding region Ar2 of the light shielding portion 21. It is possible to prevent the agent 40 from flowing out from the application region Ar1. Thereby, the uncured second adhesive 40 does not flow into the case 50 from the gap G and contaminate the peripheral components 61 to 63. In addition, since the first adhesive 30 can prevent the uncured second adhesive 40 from entering the light-shielding region Ar2, the second adhesive 40 can be applied only by irradiating with ultraviolet rays from the optical member 20 side. It can be cured as a whole.

[Display Panel According to Second Embodiment]
Next, a display panel according to a second embodiment of the present invention will be described with reference to FIGS. 2A and 2B show a display panel according to a second embodiment of the present invention. FIG. 2A is a plan view, FIG. 2B is a cross-sectional view taken along line BB in FIG. c) is a partially enlarged view of FIG.

  In FIGS. 3A to 3C, in the display panel 2 of the present embodiment, the above-described flow stopping portion 31 (first adhesive 30) of the second adhesive 40 is disposed between the display element 10 and the case 50. By providing along G, this gap G is sealed. The optical member 20 is not formed with the above-described light-shielding portion 21 (see FIG. 1), and the entire surface is provided with translucency.

  In the present embodiment, the viscosity of the first adhesive 30 forming the flow stopper 31 is higher than the viscosity of the second adhesive 40, and at least the uncured first adhesive 30 passes through the gap G from the case. Viscosity that does not flow into 50 is provided.

  Here, in the present embodiment, since the light shielding portion 21 is not formed on the optical member 20, the flow stopping portion 31 of the present embodiment is in a position that is visible from the outside via the optical member 20. For this reason, the first adhesive 30 and the second adhesive 40 are different from each other only in viscosity and use the same material having the same light transmittance and refractive index.

  Thereby, the 2nd adhesive agent 40 after hardening is integrated with the flow-stop part 31, and both become the single adhesive agent which has the optically same property. As a result, even when the flow stopper 31 is in the display area of the display element 10 or in a position where it can be visually recognized from the outside, the influence on the visibility of an image or the like can be extremely reduced.

  According to the display panel 2 of the present embodiment having the above-described configuration, an uncured portion is sealed while the gap G between the display element 10 and the case 50 is sealed by the flow stop portion 31 made of the first adhesive 30 having a high viscosity. It is possible to prevent the second adhesive 40 from flowing out from the application region Ar1, and it is possible to more reliably prevent contamination by the uncured second adhesive 40.

[Method for Manufacturing Display Panel According to First Embodiment]
Next, a method for manufacturing a display panel according to the first embodiment of the present invention will be described with reference to FIGS. FIG. 3 is a flowchart showing each step of the display panel manufacturing method according to the first embodiment of the present invention. 4 (a) to 4 (g) are schematic views showing each step of FIG.

  In the display panel manufacturing method according to the present embodiment, the display panel 1 is manufactured by bonding the display element 10 and the optical member 20, and then the display panel 1 is assembled to the case 50.

  First, in step S1 of FIG. 3, a first adhesive application process is performed. In the first adhesive application step, as shown in FIG. 4A, the uncured first adhesive 30 is applied to the surface of the display element 10, and the second adhesive 40 is applied by the first adhesive 30. The coating area Ar1 is defined. The uncured first adhesive 30 is, for example, dispensed in a predetermined pattern onto the surface of the display element 10 by the dispenser 70. In the dispenser 70, the discharge amount, the movement pattern, the movement speed, and the like are controlled by a robot (not shown) provided with arms that are movable in three axial directions orthogonal to each other. The first adhesive 30 applied by the dispenser 70 is in close contact with the surface of the display element 10 without a gap due to the fluidity when uncured.

  Subsequently, it progresses to step S2 of FIG. 3, and a 1st adhesive agent hardening process is performed. In this first adhesive curing step, as shown in FIG. 4B, the uncured first adhesive 30 applied to the surface of the display element 10 is irradiated with ultraviolet rays from an ultraviolet lamp 80 to perform first adhesion. The agent 30 is cured to form the flow stop portion 31. The flow stopping portion 31 forms a step below the thickness of the second adhesive 40 applied to the application region Ar1 in the next step, and is firmly adhered to the surface of the display element 10 without a gap by the adhesive force. The

  Subsequently, it progresses to step S3 of FIG. 3, and a 2nd adhesive agent coating process is performed. In the second adhesive application step, as shown in FIG. 4C, the uncured second adhesive 40 is applied to the application region Ar1 surrounded by the flow stopper 31. Application | coating of the 2nd adhesive agent 40 is performed by the dispenser 70 mentioned above. For example, the nozzle of the dispenser 70 is arranged at the center of the application area Ar1, and the uncured second adhesive 40 is quantitatively discharged. Then, the uncured second adhesive 40 spreads in the application region Ar1 due to its fluidity and is applied almost uniformly. The total discharge amount of the second adhesive 40 is set such that, for example, the thickness of the second adhesive 40 applied to the application region Ar1 is equal to or greater than the thickness of the flow stopper 31 due to surface tension. The uncured second adhesive 40 supplied to the application region Ar1 in this way is blocked by the step-shaped flow stopper 31 that surrounds the application region Ar1, and is prevented from flowing out to the outside.

  Subsequently, it progresses to step S4 of FIG. 3, and a joining process is performed. In this joining step, as shown in FIG. 4D, the optical member 20 is joined to the surface of the display element 10 via the uncured second adhesive 40. In this joining step, the display element 10 and the optical member 20 are positioned at predetermined positions, and when both are joined, the flow stop portion 31 on the display element 10 corresponds to the light shielding portion 21 of the optical member 20. Be joined. As described above, since the thickness of the second adhesive 40 applied to the application region Ar1 is equal to or greater than the thickness of the flow stopper 31, the optical member 20 is in close contact with the uncured second adhesive, and the display Bubbles are not mixed in or no gap is formed between the element 10 and the optical member 20.

  Subsequently, it progresses to step S5 of FIG. 3, and a 2nd adhesive agent hardening process is performed. In this second adhesive curing step, as shown in FIG. 4E, the second adhesive 40 is cured by irradiating ultraviolet rays from the ultraviolet lamp 80 from the optical member 20 side, and the display element 10 and the optical member are cured. 20 is bonded. As described above, since the flow stop portion 31 is formed at a position corresponding to the light shielding portion 21 of the optical member 20, entry of the uncured second adhesive 40 into the light shielding region Ar <b> 2 is prevented, and the optical member 20. The second adhesive 40 can be cured as a whole simply by irradiating with ultraviolet rays from the side. Thereby, the display panel 1 in which the optical member 20 is bonded to the surface of the display element 10 is formed.

  Here, in step S <b> 6 of FIG. 3, a process of assembling peripheral components is performed separately from the display panel 1. In the process of assembling the peripheral parts, as shown in FIG. 4F, the light source 61, the light guide plate 62, and the optical film 63 constituting the backlight are assembled in the case 50.

  Thereafter, the process proceeds to step S7 in FIG. 3, and the display panel 1 having undergone step S5 is assembled to the case 50 having undergone step S6. Thereby, manufacture of the display panel 1 (refer FIG. 1) which concerns on 1st Embodiment mentioned above is completed.

  According to the display panel manufacturing method of the present embodiment described above, contamination due to the outflow of the uncured second adhesive 40 can be reliably prevented in the process of bonding the display element 10 and the optical component 20. Further, since the display panel 1 is assembled to the case 50 after the second adhesive 40 is cured, the peripheral components in the case 50 are not contaminated by the uncured second adhesive 40. In particular, the flow stop portion 31 that dams up the uncured second adhesive 40 is formed by the first adhesive 30 that has fluidity when uncured, so that the flow stop portion 31 can be precisely and easily formed by the dispenser 70. It can be provided on the display element 10.

[Method for Manufacturing Display Panel According to Second Embodiment]
Next, a display panel manufacturing method according to the second embodiment of the present invention will be described with reference to FIGS. FIG. 5 is a flowchart showing each step of the method for manufacturing a display panel according to the second embodiment of the present invention. 6 (a) to 6 (f) are schematic views showing the respective steps of FIG. In addition, about the same location as the manufacturing method of 1st Embodiment mentioned above, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  In the display panel manufacturing method according to the present embodiment, the backlight and the display element 10 are sequentially assembled to the case 50, and the optical member 20 is attached to the surface of the display element 10 assembled to the case 50 in a series of this and the flow. It is a procedure for bonding.

  First, in step S11 of FIG. 5, a process of assembling peripheral parts is performed. In the process of assembling the peripheral parts, as shown in FIG. 6A, the light source 61, the light guide plate 62, and the optical film 63 constituting the backlight are assembled in the case 50.

  Next, the process proceeds to step S12 in FIG. 5 to perform a display element assembly process. In the process of assembling the display element, as shown in FIG. 6B, the display element 10 is assembled to the case 50 that has undergone step S1. Thereby, the mechanical assembly of the display panel 1 is almost completed, and the remaining work is only bonding the optical component 20 to the display element 10.

  Subsequently, it progresses to step S13 of FIG. 5, and performs a 1st adhesive agent application process. In this first adhesive application step, as shown in FIG. 6C, the uncured first adhesive 30 is applied to the surface of the display element 10 by the dispenser 70, and the second adhesive 30 applies the second adhesive. An application area Ar1 of the adhesive 40 is defined. In this first adhesive application step, if the first adhesive 30 is applied along the gap G (see FIG. 2) between the display element 10 and the case 50, the display panel 2 shown in FIG. 2 is manufactured. Can do.

  Subsequently, it progresses to step S14 of FIG. 5, and a 1st adhesive agent hardening process is performed. In this first adhesive curing step, as shown in FIG. 6D, the uncured first adhesive 30 applied to the surface of the display element 10 is irradiated with ultraviolet rays from the ultraviolet lamp 80 for the first adhesion. The agent 30 is cured to form the flow stop portion 31. Similar to the first embodiment, the flow stopping portion 31 forms a step below the thickness of the second adhesive 40 applied to the application region Ar1 in the next step, and on the surface of the display element 10 by the adhesive force. The entire surface is firmly bonded without gaps.

  Subsequently, it progresses to step S15 of FIG. 5, and a 2nd adhesive agent coating process is performed. In this second adhesive application step, as shown in FIG. 6E, the uncured second adhesive 40 is applied to the application region Ar1 surrounded by the flow stopper 31. The application of the second adhesive 40 is performed by arranging the nozzle of the dispenser 70 described above at the center of the application region Ar1 and discharging the uncured second adhesive 40 in a fixed amount. The uncured second adhesive 40 applied to the application area Ar1 is blocked by the step-shaped flow stop portion 31 surrounding the application area Ar1, and is prevented from flowing out to the outside. Thus, the uncured second adhesive 40 does not flow into the case 50 from the gap G (see FIG. 1) and contaminate the peripheral components 61 to 63.

  Subsequently, it progresses to step S16 of FIG. 5, and a joining process is performed. In this joining step, as shown in FIG. 6 (f), the optical member 20 is joined to the surface of the display element 10 through the uncured second adhesive 40.

  Then, it progresses to step S17 of FIG. 5, and performs a 2nd adhesive agent hardening process. In this second adhesive curing step, as shown in FIG. 6F, the second adhesive 40 is cured by irradiating ultraviolet rays from the ultraviolet lamp 80 from the optical member 20 side, and the display element 10 and the optical member are cured. 20 is bonded. Thereby, manufacture of the display panel 1 (refer FIG. 1) which concerns on 1st Embodiment mentioned above is completed.

  According to the display panel manufacturing method of the present embodiment described above, in the second adhesive application step (Step S15), the optical member 20 joining step (Step S16), and the second adhesive curing step (Step S17), The cured second adhesive 40 can be blocked by the flow stop portion 31. Thereby, even when the assembly process (steps S11 and S12) other than the bonding of the optical component 20 is completed first, the uncured second adhesive 40 flows into the case 50 from the gap G (see FIG. 1). Thus, the peripheral parts 61 to 63 are not contaminated.

  Moreover, in the manufacturing method of 1st Embodiment mentioned above, although 2 lines of the line which adhere | attaches the display element 10 and the optical member 20, and the line which attaches a backlight to the case 50 were required, according to this embodiment, From the assembly of the backlight to the bonding of the optical member 20 can be performed continuously in one line. Further, when the panel manufacturer and the optical member bonding agent cooperate to manufacture the display panel 1, the former performs steps S11 and S12 in FIG. 5 and the latter performs steps S13 to S17. The display panel 1 can be manufactured efficiently. In this case, the optical member bonding agent can efficiently bond the optical component 20 without contaminating the assembled display panel 1 with the uncured second adhesive 40.

  In addition, the manufacturing method of the display panel of this invention and the display panel manufactured by this method are not limited to each embodiment mentioned above. For example, in the above embodiment, the optical member 20 is bonded by applying the first and second adhesives 30 and 40 to the display element 10 side. However, the present invention is not limited to this, and the first and second adhesives 30 and 40 are bonded to the optical member 20 side. The second adhesives 30 and 40 may be applied and adhered to the display element 10. In addition, for example, when an optical member such as a polarizing plate is bonded to the back surface of the display element 10, the method or configuration of the present invention can be applied to prevent contamination due to the outflow of the adhesive.

  Furthermore, the present invention is not limited to the case where the display element 10 and the optical member 20 are bonded. For example, the display element 10 and one optical member 20 may be bonded by applying the method or configuration of the present invention, and another optical member may be bonded to the one optical member 20.

[Method for Manufacturing Display Panel According to Third Embodiment]
Next, a display panel manufacturing method according to the third embodiment of the present invention will be described with reference to FIG. FIG. 7 is a flowchart showing each process of the display panel manufacturing method according to the third embodiment of the present invention. In addition, about the same location as the manufacturing method of 1st and 2nd embodiment mentioned above, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted. In the following description, refer to FIG. 1 or FIG. 2 for the reference numerals of the components of the display panel.

  In the method for manufacturing a display panel according to this embodiment, instead of the first adhesive 30 described above, a second adhesive (using a resin material having a high viscosity of about 200,000 to 1,000,000 mPa · s at room temperature is used. The flow stop portion of the adhesive 40 is formed.

  Here, the resin material forming the flow stop portion is preferably ejected from the nozzle of the dispenser 70 and can be applied, and needs to have a viscosity that does not flow outside even after application. It is possible to use high-viscosity grease mainly composed of ether. Such high-viscosity grease containing perfluoropolyether as a main component is generally sold under the trade name “Vombringlis (“ FOMBLIN ”is a registered trademark of SOLVAY SOLEXIS)”.

  The high-viscosity grease containing perfluoropolyether as a main component has a carbon-fluorine bond and is excellent in chemical stability and inactive. When the flow stop is formed with such high viscosity grease, the flow stop exhibits high heat resistance in air and chemical resistance to adhesives, and corrodes, swells, deteriorates, or dissolves against display elements and optical members. There is no adverse effect. Furthermore, it is possible to impart optical performance such as translucency in a wide wavelength range and low refractive index to the flow stopper.

  In FIG. 7, in the display panel manufacturing method of the present embodiment, the display element 10 and the optical member 20 are first bonded (steps S21 to S24) as in the first embodiment described above, and then the display panel is assembled. You may assemble | attach to the peripheral components 61-63 (step S6, 7), or after assembling the display element 10 to the peripheral components 61-63 previously like 2nd Embodiment mentioned above (S11, S12), The optical component 20 may be bonded to the display element 10 (steps S21 to S24). That is, steps S11 and S12 and steps S6 and S7 in FIG. 7 may be carried out by arbitrarily selecting any one combination.

  Therefore, the characteristic manufacturing process in FIG. 7 will be described. In the flow stopping portion forming step in step S21, the above-described high-viscosity resin material is applied to the display element 10 to form the flow stopping portion. This resin material is dispensed by the dispenser 70 as in the above embodiment (see FIG. 4A). This resin material forms a flow stop portion that determines the application region Ar1 of the second adhesive 40 with its own high viscosity as it is without performing a curing step later. The location where the high-viscosity resin material is applied may be on the surface of the display element 10 shown in FIG. 1 or on the gap G between the display element 10 and the case 50 shown in FIG.

  Subsequently, it progresses to step S22 and an adhesive agent coating process is performed. In this adhesive application step, the uncured second adhesive 40 is applied to the application region Ar1 surrounded by the flow stopper. Application | coating of the 2nd adhesive agent 40 is performed by the dispenser 70 similarly to the said embodiment (refer FIG.4 (c)). The uncured second adhesive 40 applied to the application region Ar1 is blocked by a flow stop portion surrounding the application region Ar1, and is prevented from flowing out to the outside. Thereby, the uncured second adhesive 40 does not flow into the case 50 from the gap G and contaminate the peripheral components 61 to 63.

  Subsequently, it progresses to step S23 and a joining process is performed. In this joining step, the optical member 20 is joined to the surface of the display element 10 via the uncured second adhesive 40 as in the above embodiment (see FIG. 4D).

  Then, it progresses to step S24 and an adhesive agent hardening process is performed. In this adhesive curing step, as in the above embodiment, the second adhesive 40 is cured by irradiating ultraviolet rays from the ultraviolet lamp 80 from the optical member 20 side, and the display element 10 and the optical member 20 are bonded. (See FIG. 4 (e)). Thereby, the manufacture of the display panel according to the third embodiment is completed.

  According to the method of manufacturing the display panel of the present embodiment described above, the flow preventive portion of the adhesive having fluidity can be obtained simply by applying a resin material having a high viscosity of about 200,000 to 1,000,000 mPa · s at room temperature. The step of curing the resin material (corresponding to step S2 in FIG. 3 and step S14 in FIG. 5) is omitted in comparison with the manufacturing method of the display panel of the first and second embodiments described above. It becomes possible.

  FIG. 5 shows a display panel 2 (Example) having the configuration shown in FIG. 2 and a display panel (Comparative Example) in which the flow stop portion 31 is omitted from the configuration shown in FIG. It manufactured by the manufacturing method shown, and the presence or absence of the contamination by the outflow of the 2nd adhesive agent 40 in both display panels was compared.

(Adhesive of Example)
The first adhesive 30 is a polybutadiene acrylate photocurable adhesive resin (Kyoritsu Chemical Industry Co., Ltd .: “World Lock No. 8963D”), and the second adhesive 40 is also a polybutadiene acrylate photocurable adhesive resin (cooperative). Tachi Chemical Industry Co., Ltd .: “World Rock No. 8963”) was used. The viscosity of “World Rock No. 8963D” as the first adhesive 30 is 37000 mPa · s, and the viscosity of “World Rock No. 8963” as the second adhesive 40 is 3700 mPa · s. The viscosity of the first adhesive 30 is set to be ten times higher than the viscosity of the second adhesive 40. The refractive indexes of both adhesives 30 and 40 are both 1.515, and this refractive index is measured under the conditions of 25 ° C. and wavelength D line (589.3 nm) using an Abbe refractometer manufactured by Adago. It was.

(Adhesive of comparative example)
The first adhesive 30 is not used, and the above-mentioned polybutadiene acrylate photocurable adhesive resin (Kyoritsu Chemical Industry Co., Ltd .: “World Rock No. 8963”, viscosity 3700 mPa · s, refractive index 1 is used as the second adhesive 40. .515) only.

(Comparison result)
First, using the first and second adhesives 30 and 40 under the above conditions, the steps S11 to S17 in FIG. 5 were performed to manufacture the example of the display panel 2 shown in FIG. The ultraviolet irradiation in the second adhesive curing step in step S17 was 6000 mJ / cm ² (350 nm). As a result, in the display panel 2 according to the example, the second adhesive 40 was cured well in the application region Ar1 surrounded by the flow stopper 31, and no contamination in the case 50 occurred.

On the other hand, using the second adhesive 40 under the above conditions, steps S11, S12, and S15 to S17 in FIG. 5 (steps S13 and S14 relating to application and curing of the first adhesive 30 are omitted) are performed. A comparative example of a display panel in which the flow stop portion 31 was omitted from the configuration shown in FIG. 2 was manufactured. Similarly to the above, the ultraviolet irradiation in the second adhesive curing step in Step S17 was set to 6000 mJ / cm ² (350 nm). As a result, in the display panel according to the comparative example, the uncured second adhesive 40 flows into the gap G between the display element 10 and the case 50, and the light source 61, the light guide plate 62, and the optical film 63 constituting the backlight. Contamination was confirmed.

DESCRIPTION OF SYMBOLS 1, 2 Display panel 10 Display element 20 Optical member 21 Light-shielding part 30 1st adhesive agent 31 Flow stop part 40 2nd adhesive agent 50 Case 61 Optical film 62 Light guide plate 63 Light source 70 Dispenser 80 Ultraviolet lamp G Gap Ar1 Application area Ar2 Light-shielding region

Claims (6)

A method of manufacturing a display panel in which an optical member is bonded to a display element,
A first adhesive application step of applying a first adhesive having fluidity when uncured to at least one of the display element or the optical member, and demarcating an application area of the second adhesive by the first adhesive; ,
A first adhesive curing step of forming a flow stop portion that firmly adheres to the coated surface by curing the first adhesive;
A second adhesive application step of applying the second adhesive having fluidity when uncured to the application region;
A bonding step of bonding the display element and the optical member via the second adhesive;
A second adhesive curing step of curing the second adhesive to bond the display element and the optical member;
A display panel manufacturing method comprising: A method of manufacturing a display panel in which an optical member is bonded to a display element assembled in a case,
An assembly step of assembling the display element to the case;
A first adhesive having fluidity when uncured is applied on the inner side of the boundary between the case and the display element in at least one of the display element or the optical member, and the second adhesive is applied by the first adhesive. A first adhesive application step for defining an application region of
A first adhesive curing step of forming a flow-stopper that adheres to the application surface by curing the first adhesive;
A second adhesive application step of applying the second adhesive having fluidity when uncured to the application region;
A bonding step of bonding the optical member to the display element via the second adhesive;
A second adhesive curing step of curing the second adhesive to bond the display element and the optical member;
A display panel manufacturing method comprising: By making the viscosity of the first adhesive higher than the viscosity of the second adhesive, and applying the first adhesive along the boundary between the case and the display element, and then curing the boundary, The display panel manufacturing method according to claim 2 , wherein the display panel is sealed by a flow stop portion. The thickness of the flow preventing portion, claim 1-3 method of manufacturing a display panel according to any one which is characterized in that not more than a thickness of the second adhesive. Wherein the first and second adhesive claim 1-4 method of manufacturing a display panel according to any one, characterized in that the transmittance and the refractive index of the light is equal to the same material to each other. Display panel, characterized in that was prepared by the method of any one of claims 1-5.

Images