Display device and a manufacturing process for it

Abstract

Display device, comprehensive: a transparent laminated body (6) formed from transparent substrates (1) arranged in layers; a picture display body (2) that points towards the transparent laminated body (6); and a resin layer (3) located between the transparent laminated body (6) and the image display body (2) and made of a photocurable resin, wherein the transparent substrates (1) are bonded with a hot-melt adhesive film (5), and the hot-melt adhesive film (5) has an optical transmittance of 50% or more at a wavelength of 395 nm and an optical transmittance of 10% or less at a wavelength of 365 nm.

Description

TECHNICAL AREA

[0001] A display device and a manufacturing process for it are disclosed. In particular, a display device is disclosed which comprises a transparent body laminated from transparent substrates arranged in layers. TECHNICAL BACKGROUND

[0002] Display devices in which a glass cover is arranged on the front surface of a display board are known. Providing the glass cover protects the display board and improves the design of the display device.

[0003] The strength and safety of display devices have been improved by using multi-layered glass coverings (see, for example, JP 2010-008450 A). When the glass covering is constructed of so-called laminated glass, in which glass sheets are stacked, the strength of the covering is enhanced. With such laminated glass, even if the glass breaks or rattles, the scattering of fragments can be suppressed by an adhesive bonding the glass, thus improving safety.

[0004] In layered glass coverings, such as commercially available laminated glass, heat-activated films can be used as an intermediate layer for bonding or gluing the glass. These heat-activated films typically employ a reduced ultraviolet transmittance. This is because this type of heat-activated adhesive film is used in building and automotive applications, where it is desirable that no ultraviolet light pass through. The ultraviolet blocking function is often achieved by an ultraviolet absorber incorporated into the heat-activated adhesive film. This type of heat-activated adhesive film is designed to minimize its optical transmittance at a wavelength of 365 nm, using 365 nm as a reference wavelength.

[0005] However, to suppress double reflection of an image, resin can be filled into the space between the glass covering and the display panel. This resin can be a photocurable or light-curing resin. If, in this case, the aforementioned hot-melt adhesive film is used to bond the glass covering, there are concerns that the hot-melt adhesive film blocks light of a wavelength used to cure the photocurable resin, thus preventing optimal curing of the photocurable resin. DE 10 2011 002 494 A1 describes a capacitive touchscreen with a polarizer mounted on it. JP 2010-8450 A describes a display device that can be used in a mobile body, particularly in an aircraft, and which has flame-retardant properties in addition to shielding properties for electromagnetic waves and the safety of the front panel.EP 1 490 860 B1 describes an improved flat panel display with low reflectivity. WO 2011 / 039286 A1 describes a light modulator for a display for representing two- and / or three-dimensional image content. US 8 142 249 B2 describes a manufacturing process for a display device. DE 698 35 273 T2 describes an adhesive for an integrated display system with a touch panel, adhesive film, display system with integrated touch panel, and a manufacturing process therefor. BRIEF SUMMARY OF THE INVENTION

[0006] One object of the present disclosure is to provide a display device in which photocurable resin is cured favorably, double reflection of an image is suppressed, and which allows superior viewing conditions.

[0007] A display device is disclosed. The display device comprises a transparent laminated body formed from two or more transparent substrates arranged in layers, an image display body facing the transparent laminated body, and a resin layer located between the transparent laminated body and the image display body. The resin layer is made of a photocurable resin. Two or more transparent substrates are bonded together with a hot-melt adhesive film. The hot-melt adhesive film has an optical transmittance of 50% or more at a wavelength of 395 nm and an optical transmittance of 10% or less at a wavelength of 365 nm.

[0008] A method for manufacturing a display device is disclosed. The method for manufacturing a display device comprises a step for arranging a transparent substrate, a bonding step, and a resin curing step. In the step for arranging a transparent substrate, two or more transparent substrates are arranged in layers, with a hot-melt adhesive film having an optical transmittance of 50% or more at a wavelength of 395 nm and an optical transmittance of 10% or less at a wavelength of 365 nm placed between them. In the bonding step, two or more transparent substrates are bonded by heating and compression, forming a transparent laminated body.In the resin curing step, the transparent laminated body and an image display body are stacked or layered with a photocurable resin positioned between the transparent laminated body and the image display body, and the photocurable resin is cured with light from one side of the transparent laminated body.

[0009] The disclosed display device is a device in which photocurable resin is cured favorably and double reflection of an image is suppressed, and which has superior viewing conditions by bonding or gluing with a hot-melt adhesive film having an optical transmittance of 50% or more at a wavelength of 395 nm. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1A and Fig. 1B illustrates an example of a display device, Fig. 1A is a cross-sectional view, Fig. 1B is a top view; Fig. 2A and Fig. 2B are cross-sectional views to illustrate the reflection in the display device, Fig. 2A illustrates an example of a device containing a resin layer, and Fig. 2B illustrates an example of a device that does not contain a resin layer; Fig. 3A and Fig. Figure 3B illustrates an example of a manufacturing process for the display device and are cross-sectional views illustrating the way in which a transparent laminated body is manufactured; Fig. Figures 4A to 4D illustrate an example of a manufacturing process for the display device and are cross-sectional views; Fig. Figure 5 is a curve illustrating an example of the light transmission properties of hot melt adhesive films; Fig. Figure 6 is a curve illustrating an example of the light transmission properties of hot melt adhesive films; Fig. Figures 7A to 7C illustrate an example of the display device and the manufacturing process for it, and are cross-sectional views; Fig. Figures 8A to 8C illustrate an example of the display device and the manufacturing process for it, and are cross-sectional views; Fig. Figures 9A to 9C illustrate an example of the display device and the manufacturing process for it, and are cross-sectional views; Fig. Figures 10A to 10C illustrate an example of the display device and the manufacturing process for it, and are cross-sectional views; Fig. Figures 11A to 11C illustrate an example of the display device and the manufacturing process for it, and are cross-sectional views; and Fig. Figure 12 is a cross-sectional view illustrating an example of a display device equipped with a touch sensor. DETAILED DESCRIPTION

[0010] A display device is disclosed. The display device comprises a transparent laminated body 6, an image display body 2, and a resin layer 3. The transparent laminated body 6 is formed from two or more transparent substrates 1 arranged in layers. The image display body 2 faces the transparent laminated body 6. The resin layer 3 is located between the transparent laminated body 6 and the image display body 2. The resin layer 3 is made of a photocurable resin. Two or more transparent substrates 1 are bonded together with a hot-melt adhesive film 5. The hot-melt adhesive film 5 has an optical transmittance of 50% or more at a wavelength of 395 nm and an optical transmittance of 10% or less at a wavelength of 365 nm.

[0011] In the display device, photocurable resin is cured favorably as a result of bonding with the hot-melt adhesive film 5, which has an optical transmittance of 50% or more at a wavelength of 395 nm. The presence of a resin layer 3, which is cured photocurable resin, suppresses double reflection of an image. Therefore, the display device can be maintained with superior viewing conditions and depth of field. Furthermore, bonding with the hot-melt adhesive film 5, which has an optical transmittance of 10% or less at a wavelength of 365 nm, also suppresses the penetration of short-wavelength ultraviolet light into the device, thus preventing deterioration.

[0012] Fig. 1A and Fig. Figure 1B shows an example of a display device. Fig. 1A is a cross-sectional view of the entire display device. Fig. Figure 1B is a top view of the display device as seen from one side of the transparent laminated body 6, looking perpendicular to a surface of the transparent laminated body 6. It should be noted that in the diagrams, the layer thicknesses and component sizes have been appropriately modified to better illustrate the device's construction. In an actual device, the thicknesses and sizes may differ from those shown in the diagrams. The same applies to the subsequent diagrams.

[0013] The image display body 2 is a device that has the function of displaying an image. The image display body 2 acts as a display panel. The image display body 2 displays a planar image. An image displayed on the image display body 2 can be viewed from the outside through the transparent laminated body 6. The surface of the image display body 2 on the side of the transparent laminated body 6 is an image display surface. The image display body 2 includes a display element that performs the image display. The display element can consist of a liquid crystal display, an LED display, an organic EL display, a plasma display, or the like. The display element is designed to display an image on the image display surface. Fig. 1B shows an outer edge of the image display body 2 by dashed lines and explains how the image display body 2 can be viewed through the transparent laminated body 6 and the resin layer 3, which are transparent components.

[0014] In the Fig. In the example shown in Figure 1A, the image display body 2 is provided with a frame part 2b that projects from its periphery over the transparent laminated body 6. The frame part 2b can be designed to extend over the entire periphery of the image display body 2. As a result of the frame part 2b, a recess 2a is formed in the image display body 2. This recess 2a allows resin to easily fill the space between the image display body 2 and the transparent laminated body 6. In this case, the frame part 2b acts as a spacer. The frame part 2b can be made of a suitable component, such as a resin mold body. The frame part 2b can be connected to the transparent laminated body 6 at one of its end sections. The image display surface is formed by a floor surface of recess 2a.

[0015] The image display body 2 is preferably provided with a backlight structure. The backlight serves to emit light to the display area. The light from the backlight is emitted outwards by the display area, which consists of a liquid crystal display (LCD) or the like. As a result of the backlight, an image displayed in the image display body 2 can be displayed more brightly. The backlight structure can be formed from a stacked structure in which a lighting element, composed of an LED or the like, a light guide plate, an LCD, a color filter, and a polarizing plate, for example from the rear surface, are stacked in the specified order.

[0016] In the Fig. In the example shown in Figures 1A to 1B, the image display body 2 is housed in a housing 4, which is connected to a circumferential portion of the transparent laminated body 6. The housing 4 protects the components located within it, such as the image display body 2. A controller configured to control the image display and similar functions can be provided within a portion of the housing 4.

[0017] The transparent laminated body 6 is formed from two or more transparent substrates 1. These two or more transparent substrates 1 are bonded together using the hot-melt adhesive film 5. The transparent laminated body 6 is formed by stacking or layering two or more transparent substrates 1. As a result, the protective performance of the transparent laminated body 6 can be improved. That is, the strength and safety can be enhanced by using a substrate that protects the multi-layered interior. Since two or more transparent substrates 1 are bonded together using the hot-melt adhesive film 5, they can be easily bonded with high positional accuracy. Consequently, a display device with a superior appearance and a well-designed structure can be obtained.

[0018] The transparent substrates 1 can consist of a transparent, flat substrate. The transparent substrates 1 can have a plate-like, film-like, or foil-like form. Using the transparent substrates 1, the image-display body 2 can be protected. Glass is preferably used as the transparent substrate 1. As a result of the transparent substrates 1 being made of glass, the transparency can be improved, thus improving the visibility of an image display and also providing favorable protection for the image-display body 2. When the transparent substrates 1 are made of glass, they are called a glass covering. A preferred form of the transparent substrate 1 is a glass plate. The transparent substrate 1 can also be made of resin.It should be noted that if the transparent substrates 1 are made of resin, a resin with high hardness and transparency is preferred. For example, the transparent substrates 1 can be made of polycarbonate. It should also be noted that a protective layer can be applied to the outer surface of the transparent substrates 1. This protective layer improves the protective performance and prevents scratching of the surface of the transparent substrate 1. The protective layer can be made of a resin film or a similar material.

[0019] When two or more transparent glass substrates 1 are manufactured, the transparent laminated body 6 can be constructed using so-called laminated glass, in which two or more glass sheets are stacked. In this case, the transparent laminated body 6 is a glass covering. Using laminated glass improves the strength of the glass covering. Furthermore, even if the glass breaks or cracks, the adhesive holding the glass sheets together in such laminated glass prevents the scattering of fragments, thus improving safety.

[0020] The transparent laminated body 6 can also be formed by a transparent substrate 1 made of glass and a transparent substrate 1 made of resin, bonded together with the hot-melt adhesive film 5. In this case, the transparent substrate 1 made of glass is preferably located on the inside (one side of the image-display body 2). That is, the transparent substrate 1 made of resin is located on the outside. As a result of forming the transparent laminated body 6 with a complex substrate made of glass and resin, the strength and safety can be advantageously improved. High-strength resin is preferred to suppress scratches. For example, polycarbonate can be used as the resin for the transparent substrates 1, that is, encapsulated within the transparent laminated body 6.

[0021] The thickness of each of the transparent substrates 1 is not particularly limited; however, the thickness of each of the transparent substrates 1 is preferably, for example, 4 to 6 mm. If the transparent substrates 1 have such a thickness, the transparent laminated body 6 can be easily obtained. Of course, the thickness of each of the transparent substrates 1 can be 6 mm or more. The transparent substrates 1 that form the transparent laminated body 6 can have the same thickness or different thicknesses. In the case where two or more transparent substrates 1 made of the same material are stacked, having the same thickness of the transparent substrates 1 facilitates manufacturing. Likewise, the thickness of the transparent laminated body 6 is not particularly limited. For example, the thickness of the transparent laminated body 6 can be 5 to 50 mm, preferably 8 to 20 mm.

[0022] In the display device, two or more transparent substrates 1 are bonded together using the hot-melt adhesive film 5. After bonding, the hot-melt adhesive film 5 forms a layer. This layer can be formed from a layer of hot-melt adhesive film 5 that is cooled to harden after being heated to soften and exhibit tackiness. The layer of hot-melt adhesive film 5 is defined as an adhesive layer. The adhesive layer formed from the hot-melt adhesive film 5 is located between an outer surface and an inner surface of the transparent substrate 1.

[0023] The hot-melt adhesive film 5 is made from a film material that exhibits tackiness upon heating. The hot-melt adhesive film 5 is a film-like, molded body. The hot-melt adhesive film 5 is not tacky before it is heated (before use). The hot-melt adhesive film 5 softens upon heating and becomes tacky. The hot-melt adhesive film 5 can be melted when heated. The adhesive layer is formed from the hot-melt adhesive film 5. The hot-melt adhesive film 5 can be made, for example, from a thermoplastic resin film. It can also be made from a film made of an addition-polymerizable monomer or resin. As a result of its use, the hot-melt adhesive film 5 can easily bond two or more transparent substrates 1. This allows for the production of a display device with superior visibility and a well-designed appearance.It should be noted that although the state of the hot melt adhesive film 5 after heating may differ from its state before heating, the adhesive layer formed from the hot melt adhesive film 5 is given the reference number 5 in the diagram for better understanding. Consequently, the adhesive layer formed from the hot melt adhesive film 5 can be considered "adhesive layer 5".

[0024] In the case of a display device with a large screen, there are instances where gluing the components together is difficult. For example, if the display screen is 50 inches (127 cm) or larger, or even 70 inches (177.8 cm) or larger, gluing it together is not easy. It is conceivable that the components could be glued using optically transparent adhesive (OCA) tape. However, optically transparent tape is tacky in its normal state. Therefore, if optically transparent tape is used, re-gluing is not possible. Consequently, the components do not adhere easily. It is also generally difficult to bond two or more transparent, thick substrates with optically transparent adhesive (OCA) tape.Since it is not possible to bend the thick, transparent substrate 1 itself, air is easily trapped during bonding, and bubbles often remain on the bonded surface. Therefore, achieving sufficient reproducibility through bonding is very difficult. To avoid compromising the appearance, it is also desirable to bond each component with high positional accuracy. However, with optically transparent adhesive tape, components must be stacked or placed on top of each other on a tacky surface, aligning their positions precisely, and re-bonding is not possible. Therefore, achieving high positional accuracy through bonding is particularly challenging with devices that have a large display area.On the other hand, using the hot-melt adhesive film 5, after the components have been aligned and stacked in a state where the hot-melt adhesive film 5 is not tacky, the components can be bonded together by the heated hot-melt adhesive film 5. Consequently, when thick transparent substrates 1 are used, bonding can be easily carried out without trapping air. Even when large transparent substrates 1 are used, alignment can be easily achieved with high accuracy. As a result, the display device can be obtained with superior visibility and a well-designed appearance. And even if, for example, the thickness of each of the transparent substrates 1 is 5 mm or more, or even 10 mm or more, bonding can be carried out efficiently regardless of the thickness.Even with a large screen whose short side is 0.5 m or more, or 1 m or more in the case of a rectangular screen, component gluing can easily be performed with high positional accuracy. For a square screen, the length of one side can be 0.5 m or more, or 1 m or more. It should be noted that there is no upper limit to the screen size, but the length of one side can be 3 m or less, or, for example, 2 m or less for a rectangular or square screen. It should also be noted that the shape of the display device is not limited to a quadrilateral, but can be any other polygon (such as a triangle, hexagon, or octagon), a circle, an ellipse, or the like.

[0025] The hot-melt adhesive film 5 exhibits tackiness upon heating and bonds two transparent substrates 1 facing each other. The hot-melt adhesive film 5 can be electrically insulating. The hot-melt adhesive film 5 preferably becomes transparent after heating. That is, the adhesive layer formed by the hot-melt adhesive film 5 is preferably transparent. Consequently, an image can be displayed to the outside. The hot-melt adhesive film 5 does not need to be completely transparent before heating. However, the hot-melt adhesive film 5 preferably has optical transparency, such that the outline of an object located on the opposite film can be seen through it. Consequently, alignment can be easily achieved.

[0026] Resin layer 3 is positioned between the transparent laminated body 6 and the image display body 2. Resin layer 3 is made of resin that fills the space between the transparent laminated body 6 and the image display body 2. As a result, resin layer 3 between the image display body 2 and the transparent laminated body 6 suppresses double reflection from the image and enables an image display with superior viewing conditions.

[0027] The mechanism of double reflection of an image and its suppression in the display device is described with reference to Fig. 2A and Fig. 2B described. The double reflection of an image is caused by a mixture of surface reflection, which occurs on a surface of the transparent laminated body 6 (for example, glass covering), and secondary reflection, which occurs on a surface of the image-display body 2 (for example, scoreboard). In a Fig. In the setup shown in 2B, resin does not fill the space between the transparent laminated body 6 and the image-display body 2, and the resin layer 3 is not formed. Consequently, the space forms a 2x space. In this case, light traveling across the transparent laminated body 6 from the outside becomes, due to surface reflection, light P1, which is reflected off the surface of the transparent laminated body 6 and travels across the outside, and, due to secondary reflection, light P2, which is reflected off the surface of the image-display body 2 and travels across the outside. Due to the presence of light P1 and light P2, double reflection of an image occurs. If the resin layer 3 between the transparent laminated body 6 and the image-display body 2, as in 2B, is not formed, the image will be 2x. Fig. As shown in Figure 2A, the reflection index of a medium filling the space between the transparent laminated body 6 and the image-display body 2 is close to that of the transparent laminated body 6. Consequently, light P2 is suppressed due to secondary reflection and almost disappears, and light P1 becomes dominant as the reflected light due to surface reflection. As a result, the generation of two or more reflected lights is suppressed, and the double reflection of an image can be reduced.

[0028] Resin layer 3 is produced from a photocurable resin. Resin layer 3 can be easily formed by curing the photocurable resin. The photocurable resin is preferably a fluid resin. In a preferred mode, the photocurable resin is cured by an accretion reaction. It is preferred that the photocurable resin does not generate any volatile or low molecular weight components, such as water and low molecular weight alcohols, during curing. A photocurable resin with a smaller volume change before and after curing is preferred. Consequently, the filling capacity can be improved by resin layer 3. The photocurable resin is preferably an ultraviolet-curable resin.

[0029] For example, the resin layer 3 can be formed by filling the space between the transparent laminated body 6 and the image display body 2 with the photocurable resin and exposing the photocurable resin to light from one side of the transparent laminated body 6. The adhesive layer formed from the heat-activated adhesive film 5 preferably transmits light of a wavelength that cures the photocurable resin. The resin layer 3 is preferably made of an adhesive resin. Consequently, the image display body 2 and the transparent laminated body 6 can be strongly bonded. Of course, if the frame part 2b of the image display body 2 and the transparent laminated body 6 is sufficiently fixed, the resin layer 3 does not need to be sticky.

[0030] Now, a manufacturing process for a display device will be described.

[0031] The manufacturing process of the display device includes a step for arranging a transparent substrate, an adhesive bonding step, and a resin curing step. The step for arranging a transparent substrate is a step in which two or more transparent substrates 1 are arranged in layers, with the hot-melt adhesive film 5, having an optical transmittance of 50% or more at a wavelength of 395 nm and an optical transmittance of 10% or less at a wavelength of 365 nm, placed between them. The adhesive bonding step is a step in which two or more transparent substrates 1 are bonded together by heating and pressing, forming the transparent laminated body 6.The step to cure the resin is a step in which the transparent laminated body 6 and the image display body 2 are stacked in layers with photocurable resin located between the transparent laminated body 6 and the image display body 2, and the photocurable resin is cured with light from the side of the transparent laminated body 6.

[0032] In the manufacturing process of the display device, a photocurable resin is cured favorably by bonding it with the hot-melt adhesive film 5, which has an optical transmittance of 50% or more at a wavelength of 395 nm. The resulting photocurable resin layer 3 suppresses double reflection of the image. Consequently, a display device with superior viewing characteristics can be produced.

[0033] Fig. Figures 3A to 3B show an example of the manufacturing process of the display device and illustrate a way in which the transparent laminated body 6 is manufactured. Fig. 3A and Fig. Figure 3B shows the step for arranging a transparent substrate and the gluing step.

[0034] When the transparent laminated body 6 is manufactured, the hot melt adhesive film 5 is first applied between one transparent substrate 1 and another transparent substrate 1, as shown in Fig. As shown in Figure 3A, two or more transparent substrates 1 of the same size are arranged in a preferred mode. In one preferred mode, two or more transparent substrates 1 of different sizes are stacked such that their position aligns with the perimeter portion. In another preferred mode, two or more transparent substrates 1 of different sizes are used. For example, the outer surface of a transparent substrate 1 may be slightly larger than its inner surface. Alignment markers can be provided on two or more transparent substrates 1. When alignment markers are provided, the alignment of two or more transparent substrates 1 is easily accomplished. Alignment markers can be formed by printing, cutting, or the like. Even when two or more transparent substrates 1 are used with a pattern, as described below, alignment can be performed using this pattern.

[0035] The heat-activated adhesive film 5 is not tacky before heating. In the case where adhesive tape or the like is used when layering two or more transparent substrates 1, the two or more transparent substrates 1 are glued together by the tape, and as a result, it is difficult to fine-tune the positions of the transparent substrates 1 once layered. Thus, layering with high accuracy is required when gluing is performed; re-gluing the transparent substrates 1 once layered is difficult, and therefore, gluing two or more transparent substrates 1 with high positional accuracy is not easy.On the other hand, when using the hot-melt adhesive film 5, since the hot-melt adhesive film 5 is not tacky before heating, fine adjustment of the positions of the transparent substrates 1 can be easily carried out by individually moving the transparent substrates 1 horizontally (in a direction parallel to the surface of the transparent substrate 1) or similar means, in a state where two or more transparent substrates 1 are layered. As a result of this fine adjustment, the alignment can be carried out more reliably, and two or more transparent substrates 1 can be stacked and bonded together by heating and pressing in an aligned state. Consequently, components with high positional accuracy are easily bonded, and the transparent laminated body 6 can be formed.

[0036] Then, as a result of heating and pressing them together from both sides, as indicated by arrows in Fig. Figure 3A shows layered substrates glued and joined together, and the transparent laminated body 6, which encloses two or more transparent substrates 1, can be formed as shown in Fig. Figure 3B shows that heating and pressing can be carried out using a press. The press preferably uses a vacuum press. As a result of pressing under reduced pressure, substrates with high tack can be bonded. The pressing can be performed in a temperature range of 80 to 150°C and for a period of, for example, 5 to 30 minutes, but the temperature and duration are not limited to these parameters.

[0037] Although a method in which a heat-activated adhesive film 5 is located between two transparent substrates 1 is described above, two or more heat-activated adhesive films 5 can also be arranged between two or more transparent substrates 1. In this case, the thickness can be adjusted by the number of heat-activated adhesive films 5.

[0038] Fig. Figures 4A to 4D show an example of the manufacturing process of the display device and a way in which the transparent laminated body 6 and the image display body 2 are bonded together. Fig. 4C, from Fig. Sections 4A to 4D explain the resin curing step.

[0039] When the transparent laminated body 6 and the image display body 2 are glued together, the one in Fig. 4A Image-display body 2 shown is manufactured. The image-display body 2, in which a display part made of liquid crystal or the like is manufactured, and a frame part 2b is formed in the perimeter part, can be used. The perimeter part 2b can extend in a direction beyond that in which an image is displayed.

[0040] Now, as in Fig. Figure 4B shows the recess 2a formed by the frame part 2b filled with a resin composition 3a. The resin composition 3a is made from a photocurable resin. Here, the resin composition 3a is in a fluid state and fills the entire recess 2a.

[0041] Now, as in Fig. Figure 4C shows the transparent laminated body 6 and the image-display body 2 stacked in layers with the photocurable resin placed between them. The transparent laminated body 6 faces the image-display body 2. The image-display body 2 is positioned such that an image-display surface is on one side of the transparent laminated body 6. At this stage, because the resin composition 3a has not yet cured, it adheres to the transparent laminated body 6, and the filling capacity is improved. The positions of the transparent laminated body 6 and the image-display body 2 in the horizontal direction can also be finely adjusted. Then, with the transparent laminated body 6 and the image-display body 2 stacked in layers, the resin composition 3a is exposed to light (such as UV light) from an outer surface of the transparent laminated body 6. Fig. Figure 4C shows a method in which ultraviolet (UV) light is provided as a preferred mode of illumination. As a result of the illumination, the photocurable resin is cured, and the resin layer 3 is formed by the cured resin. The heat-activated adhesive film 5 is formed such that light in a wavelength region that cures the photocurable resin can pass through it. Consequently, the resin is cured by the light that passes through the heat-activated adhesive film 5. The thickness of the space between the image display body 2 and the transparent laminated body 6 can be adjusted, for example, from 1 to 10 mm. Therefore, the resin layer 3 can be provided to have a thickness of approximately 1 to 10 mm.It should be noted that, from the standpoint of suppressing double reflection of an image, it is preferred that the difference between the refractive indices of the resin layer 3 and the transparent laminated body 6 be smaller. The difference in absolute values ​​may preferably be less than 0.2, more preferably 0.1 or less, and further more preferably 0.05 or less, but is not limited thereto. It should be noted that in the case where the transparent laminated body 6 is formed from two or more transparent substrates 1 with a different refractive index from one another, it is preferred that the difference between the refractive indices of each of the transparent substrates 1 be smaller. For example, the difference in absolute values ​​may preferably be less than 0.2, more preferably 0.1 or less, and further more preferably 0.05 or less, but is not limited thereto.

[0042] As in Fig. As shown in Figure 4D, the result of bonding the transparent laminated body 6 and the image display body 2 is the display device comprising the transparent laminated body 6, the image display body 2, and the resin layer 3. The transparent laminated body 6 and the image display body 2 are preferably bonded by the resin layer 3. A structure in which the transparent laminated body 6 and the image display body 2 are bonded in a planar manner is also referred to as direct bonding. The frame part 2b of the image display body 2 and the transparent laminated body 6 can also be fastened by a fastener. The fastener can be achieved by fixing with an adhesive, fixing with a fitting structure, or the like. Fig. The display device shown in 4D can then be combined with other components, such as housing 4, an electrical circuit comprising the controller, and the like, as shown in Fig. 1A and Fig. 1B is shown, equipped.

[0043] Although the step in which the photocurable resin is located on the surface of the image display body 2 on the side of the transparent laminated body 6 is shown as a step for arranging the resin, it has been described above that the photocurable resin can be arranged on one surface of the image display body 2 on the side of the transparent laminated body 6. Alternatively, the photocurable resin can be provided on both the surface of the image display body 2 on the side of the transparent laminated body 6 and the surface of the transparent laminated body 6 on the side of the image display body 2. Alternatively, after the transparent laminated body 6 and the frame part 2b of the image display body 2 have been bonded, the photocurable resin can be injected into a space formed between the transparent laminated body 6 and the image display body 2.In short, the resin layer 3 can be formed as a result of the photocurable resin being arranged between the transparent laminated body 6 and the image display body 2. The resin arrangement step is defined as a step in which the photocurable resin is located on at least one surface of the image display body 2 on the side facing the transparent laminated body 6 and on the surface of the transparent laminated body 6 on the side facing the image display body 2. It should be noted that, to improve the resin's filling capacity, it is preferred that a recess 2a be provided in the image display body 2 and that the recess 2a be filled with the photocurable resin as described above.

[0044] The hot-melt adhesive film 5 exhibits an optical transmittance of 50% or more at a wavelength of 395 nm. Light of the wavelength at which the photocurable resin is cured can pass through the hot-melt adhesive film 5 and reach the photocurable resin, thus facilitating its curing. The optical transmittance of the hot-melt adhesive film 5 is preferably 60% or more, and more preferably 70% or more, at a wavelength of 395 nm. Although, strictly speaking, the optical transmittance is the transmittance before bonding, in cases where the transmittance before and after bonding hardly changes, it can be the transmittance of the hot-melt adhesive film 5 after it has been heat-cured.

[0045] The optical transmittance of the hot-melt adhesive film 5 at a wavelength of 365 nm is 10% or less. Light with the short wavelength side (ultraviolet light) can be blocked by the hot-melt adhesive film 5, thus suppressing ultraviolet light penetration and preventing deterioration of the device. For example, if the display device is installed in a location exposed to ultraviolet light, such as outdoors, there is concern that the device will degrade due to ultraviolet light. However, the effects of ultraviolet light can be reduced by blocking it. The optical transmittance of the hot-melt adhesive film 5 at a wavelength of 365 nm is preferably 5% or less, more preferably 3% or less.Although the optical transmittance, strictly speaking, is a transmittance before bonding, in the case where the transmittance hardly changes before and after bonding, it can be the transmittance of the hot-melt adhesive film 5 after it has been cured by heat.

[0046] The type of hot-melt adhesive film 5 is such that its optical transmittance at a wavelength of 395 nm is 50% or more, and its optical transmittance at a wavelength of 365 nm is 10% or less. Typically, in a film exhibiting heat-induced tackiness, such as hot-melt adhesive film 5, a film with reduced ultraviolet transmittance has been used. This type of hot-melt adhesive film is designed to minimize its optical transmittance at a wavelength of 365 nm, using 365 nm as a reference. However, if the hot-melt adhesive film used in these applications, as it is used in the display device, there are concerns that it may block light at the wavelength at which the photocurable resin cures, thus preventing optimal curing of the resin.Many types of photocurable resin are cured by ultraviolet light and light in the visible light range (for example, wavelengths of 410 nm or less) close to ultraviolet light, and the hot-melt adhesive film 5 blocks light with a wavelength close to 395 nm. Therefore, the hot-melt adhesive film 5, whose optical transmittance at a wavelength of 395 nm is 50% or more, is used in the display device. Because the photocurable resin is available in a form that can be cured with light of a wavelength of 395 nm or 405 nm, the resin is preferentially cured with light of this wavelength, and the resin layer 3 can be formed.Even when using the hot-melt adhesive film 5, whose optical transmittance at a wavelength of 365 nm is 10% or less, the transmission of ultraviolet light, which differs from the wavelength used for curing, can be prevented as much as possible. Ultraviolet light with a shorter wavelength has a higher energy level and exerts a greater influence on the device than light with a longer wavelength. Therefore, by blocking as much short-wavelength ultraviolet light as possible, the negative effects of ultraviolet light can be suppressed.

[0047] The hot-melt adhesive film 5 preferably contains at least one ethylene-vinyl acetate copolymer and polyvinyl butyral as a main component. The main component is a monomer that is an essential component of a polymer or resin. The ethylene-vinyl acetate copolymer is also known as EVA resin. The polyvinyl butyral is also known as PVB. When these resins are used, an adhesive layer can be formed that transmits more light at a wavelength at which the photocurable resin can be cured. Consequently, the hot-melt adhesive film 5, whose optical transmittance of light at a wavelength of 395 nm is 50% or more, can be more easily obtained.

[0048] The hot-melt adhesive film 5 preferably contains an ultraviolet absorber. As a result of the ultraviolet absorber, the hot-melt adhesive film 5, whose optical transmittance at a wavelength of 365 nm is 10% or less, can be more easily obtained.

[0049] The hot melt adhesive film 5 may contain a suitable additive, distinct from the main component, which is made from at least one ethylene-vinyl acetate copolymer and polyvinyl butyral, and the ultraviolet absorber. Examples of the additive include a polymerization initiator, a polymerization inhibitor, and the like. A specific example of hot melt adhesive film 5 includes "Melthene-G" (from Tosoh Corporation) for EVA, and Sentry Glass Expressions (registered trademark) from DuPont for PVB.

[0050] In the manufacture of the display device, the curing light preferably has a peak wavelength in the range of 390 to 410 nm. This allows the light to effectively penetrate the hot-melt adhesive film 5, enabling the photocurable resin to absorb the light. The peak wavelength can be defined as the wavelength at which a peak with the highest amplitude appears when relative values ​​of light energy are plotted against wavelength. As a result, using light with a relatively short wavelength, such as 410 nm or less, can improve curability because shorter wavelength light has a higher energy level. The curing light preferably has a peak wavelength in the range of 390 to 400 nm.

[0051] A light source for curing is not particularly limited, but could be, for example, a metal halide lamp, a UV lamp, a super-high-pressure mercury lamp, or similar. When using a metal halide lamp, the emitted light can have a peak near a wavelength of 405 nm in addition to a component at wavelengths of 365 nm or less, and this light can be used for curing. When using a super-high-pressure mercury lamp, the emitted light can have a peak near wavelengths of 405 nm (h-line) and 436 nm (g-line) in addition to a component at wavelengths of 400 nm or less, and this light can be used for curing. An LED light source in the visible spectrum can also be used as a light source.In this case, an LED lamp with a peak wavelength of 405 nm (h-line) can preferably be used.

[0052] The photocurable resin preferably has the property of being cured by light at a wavelength of 410 nm or less. The photocurable resin is cured when light with a wavelength of 410 nm or less is provided, and the resin layer 3 can be effectively cured. The photocurable resin preferably has the property of being cured by light at a wavelength of 405 nm and more preferably has the property of being cured by light at 395 nm. The photocurable resin is more preferably also an ultraviolet curable resin. The ultraviolet curable resin is a resin with the property of being cured when exposed to ultraviolet light. Some ultraviolet curable resins have the property of being cured not only by ultraviolet light but also by light in a wavelength range of the visible light spectrum that is close to ultraviolet light.Using such ultraviolet-curable resins, even if the hot-melt adhesive film 5 suppresses ultraviolet light to some extent, curing can be effectively carried out and the resin layer 3 can be formed. Therefore, the ultraviolet-curable resin preferably has the property of being cured with light at a wavelength of 395 nm, and more preferably has the property of being cured with light at a wavelength of 405 nm. The photocurable resin can be an ultraviolet-curable resin such as "FINSET" (liquid type) from Hitachi Chemical Company, Ltd., or the like. It should be noted that the photocurable resin may have the property of not being cured with light of a wavelength exceeding 450 nm, but this is not a limitation.

[0053] Fig. Figure 5 is a curve illustrating an example of the light transmittance property of the hot melt adhesive film 5. In this curve, the horizontal axis represents the wavelength of light, and the vertical axis represents optical transmittance. Curves labeled (a) and (d) show the optical transmittance of the hot melt adhesive film 5 made from a resin whose main component is polyvinyl butyral. Curves labeled (b) and (c) show the optical transmittance of the hot melt adhesive film 5 made from a resin whose main component is an ethylene-vinyl acetate copolymer. The thickness of each film is 0.75 mm for (a) and (d), 0.3 mm for (b), and 0.8 mm for (c). The hot melt adhesive film 5 of each of (a) and (b) exhibits an optical transmittance exceeding 50% at a wavelength of 395 nm. Light with a wavelength of 410 nm or less, especially light with a wavelength of 395 nm (ultraviolet light), can pass through and the photocurable resin can be cured.On the other hand, the hot melt adhesive film of each of (c) and (d) exhibits an optical transmittance of less than 40% at a wavelength of 395 nm, and therefore there are concerns that sufficient curability cannot be achieved. The hot melt adhesive film 5 is preferably made of resin that can transmit as much light as possible at a wavelength of 395 nm. Furthermore, the hot melt adhesive film of each of (a) to (d) exhibits an optical transmittance of less than 10% at a wavelength of 365 nm. Therefore, the effect of filtering short-wavelength ultraviolet light can be achieved. Consequently, the hot melt adhesive film 5 of each of (a) and (b) is preferably the one that has a relatively high optical transmittance at a wavelength of 395 nm and a relatively low optical transmittance at a wavelength of 365 nm.It should be noted that the hot melt adhesive film of each of (c) and (b) has an optical transmittance exceeding 60% at a wavelength of 410 nm, and thus the curability can be considered improved, but the time required for curing may increase because the light energy decreases as the wavelength increases. In this sense, hot melt adhesive film 5 of each of (a) and (b) is preferable.

[0054] Fig. Figure 6 is a curve illustrating another example of the light transmittance property of the hot melt adhesive film 5. In this curve, the horizontal axis represents the wavelength of light, and the vertical axis represents optical transmittance. Curves labeled (a) and (d) show the optical transmittance of the hot melt adhesive film 5, formed from a resin whose main component is polyvinyl butyral. Curves labeled (b) and (c) show the optical transmittance of the hot melt adhesive film 5, formed from a resin whose main component is an ethylene-vinyl acetate copolymer. The thickness of each film is 0.75 mm for (a) and (d), and 0.8 mm for (b) and (c). The hot melt adhesive film 5 of each of (a) and (b) exhibits an optical transmittance exceeding 50% at a wavelength of 395 nm.Light with a wavelength of 410 nm or less, especially light with a wavelength of 395 nm (ultraviolet light), can pass through the photocurable resin, which can be cured. Furthermore, the hot melt adhesive film 5 of each of (a) to (d) exhibits an optical transmittance of less than 10% at a wavelength of 365 nm. Therefore, a short-wavelength ultraviolet light-blocking effect can be achieved. This is because the hot melt adhesive film 5 of each of (a) and (b) is preferable to the hot melt adhesive film 5 of each of (c) and (d), which is similar to those described for . Fig. 5, is.

[0055] When the components in the manufactured display device are bonded using the hot-melt adhesive film 5, the resulting structure may differ from that where the components are bonded using an optically clear adhesive that is tacky at room temperature. The structure may also differ from that where the components are bonded by coating them with a fluid adhesive. For example, when bonding is carried out using the hot-melt adhesive film 5, it may be observed that, after bonding, the end portion(s) of the corresponding films are not on the same plane, so that the hot-melt adhesive film 5 may extend slightly outwards beyond one of the transparent substrates 1, or the hot-melt adhesive film 5 may be slightly smaller than one of the transparent substrates 1.It can also be confirmed whether the adhesive layer material consists of a film, an optically clear adhesive, or a fluid resin by analyzing the material. Therefore, bonding by the hot melt adhesive film can be confirmed by performing an analysis.

[0056] Fig. Figures 7A to 7D show another embodiment of a display device and a manufacturing method for it. Fig. 7A and Fig. 7B explain a step in which a transparent laminated body 6 is formed by two or more transparent substrates 1 which are bonded together with a hot-melt adhesive film 5. Fig. Figure 7C shows the display device, which is formed by bonding the transparent laminated body 6 and an image display body 2. In the case of the one shown in Fig. In the display device shown in Figures 7A to 7C, the transparent laminated body 6 comprises substances that form a pattern between two or more transparent substrates 1. Therefore, the structure is improved. The same structure as that of the embodiment described above is designated with the same reference numerals, and its description is omitted.

[0057] In the preferred embodiment, the transparent laminated body 6 comprises substances that form a pattern between two or more transparent substrates 1. As a result of the substances forming a pattern between the two or more transparent substrates 1, this pattern can be seen when viewing the display device, and thus the shape of the pattern can be formed and improved. The substances forming a pattern are defined as pattern substances 21.

[0058] In the Fig. In the example shown in Figures 7A to 7C, the pattern substances 21 are applied to the surfaces of the transparent substrates 1. The pattern substances 21 can, for example, consist of printing layers 22. In the case that the pattern substances 21 consist of the printing layers 22, a well-designed pattern can easily be formed. The printing layers 22 can be monochromatic or polychromatic, or they can have colors.

[0059] In Fig. In steps 7A to 7C, the printing layers 22 are provided on a surface on one side, on which another transparent substrate 1 is stacked. Fig. In 7A to 7C, there are two transparent substrates 1, and the printed layers 22 are provided on an inner surface of an outer surface arranged by transparent substrates 1 and on an outer surface of an inner transparent substrate 1. Of course, the printed layers 22 can be provided on an inner surface of the outer surface arranged by transparent substrate 1 or on an outer surface of the inner transparent substrate 1. Here, in the case where the pattern substances 21 are provided on two or more transparent substrates 1 to suppress a gap in the pattern, the layering of the transparent substrates 1 with high accuracy is required. During this time, in the case where the bonding is carried out using the hot-melt adhesive film 5, two or more transparent substrates 1 can be layered on top of each other with high positional accuracy.Therefore, a gap or void in the pattern can be effectively suppressed. In this method, if the printing layers 22 are provided on both surfaces facing each other of two transparent substrates 1, the transparent substrates 1 can be bonded more effectively with high positional accuracy, and the pattern can be formed. It should be noted that the printing layers 22 can be provided on a surface of the side of the image display body 2 of the transparent substrate 1 located inside. In this case, the printing layers 22 are embedded in a resin layer 3. Furthermore, in the display device, the pattern substances 21 are not provided between the transparent substrates 1, but rather on a surface of the side of the image display body 2 of the transparent substrate 1 located inside.

[0060] The pattern substances 21 can be provided in a frame-like form to surround a portion in which an image is displayed, for example, by the image display body 2. In this case, a pattern can be formed from a screen frame. As a result, the image structure that fits into the frame is improved. Of course, the pattern substances 21 can be provided in such a way that they overlap a display area to such an extent that the image display is not obstructed. In this case, the pattern can be provided and the structure improved before the image display. The arrangement of the pattern substances 21 as described above can be applied similarly to those of the pattern substances 21 described in the following embodiment.

[0061] The production of the in Fig. The display device shown in Figures 7A to 7C can be implemented using a transparent substrate 1 with printed layers 22 as pattern substances 21. For example, the pattern substances 21 can be provided on the transparent substrate 1 by printing the transparent substrate 1 prior to the formation of the transparent laminated body 6. The pattern substances 21 can be embedded in a layer of the hot melt adhesive film 5 during the formation of the transparent laminated body 6. Bonding the transparent laminated body 6 and the image display body 2, and forming the resin layer 3, can be carried out using the same method described in the preceding embodiment.

[0062] Fig. Figures 8A to 8C show a further embodiment of a display device and a manufacturing method for it. Fig. 8A and Fig. 8B explain the step in which a transparent laminated body 6 is formed by two or more transparent substrates 1 bonded together with a hot melt adhesive film 5. Fig. Figure 8C shows the display device formed by bonding the transparent laminated body 6 and an image display body 2. In the case of the one shown in Fig. In the display device shown in Figures 8A to 8C, the transparent laminated body 6 comprises substances that form a pattern between two or more transparent substrates 1. Therefore, the structure is improved. The same structure as that of the embodiment described above is designated with the same reference numerals, and its description is omitted.

[0063] In a Fig. In the example shown in Figures 8A to 8D, pattern substances 21 are provided on a surface of the hot melt adhesive film 5. The pattern substances 21 can, for example, be composed of printing layers 22. In the case where the pattern substances 21 are composed of the printing layers 22, a well-designed pattern can be easily formed. The printing layers 22 can be monochromatic or polychromatic, or they can have colors.

[0064] In Fig. In steps 8A to 8C, the printed layers 22 are provided on a surface that overlaps a transparent substrate 1 of hot melt adhesive film 5. Fig. In 8A to 8C, there are two transparent substrates 1, and the layers 22 are provided on a surface of the hot melt adhesive film 5, which becomes an internally arranged transparent substrate 1 (a back side of the hot melt adhesive film 5). For example, the printed layers 22 can be provided not on an inner surface of the hot melt adhesive film 5, but on the outer surface of the hot melt adhesive film 5. The printed layers 22 can also be provided on both an outer and an inner surface of the hot melt adhesive film 5. In other words, the printed layers 22 can be provided on at least one outer surface and one inner surface of the hot melt adhesive film 5. In this case, the structure can be improved.

[0065] The production of the in Fig. The display device shown in Figures 8A to 8C can be implemented using the hot melt adhesive film 5 with the printed layers 22 as pattern substances 21. For example, the pattern substances 21 can be provided on the hot melt adhesive film 5 by printing the hot melt adhesive film 5 prior to the formation of the transparent laminated body 6. The pattern substances 21 can be embedded in a layer of the hot melt adhesive film 5 during the formation of the transparent laminated body 6. Bonding the transparent laminated body 6 and the image display body 2 and forming the resin layer 3 can be carried out by the same method described in the preceding embodiment.

[0066] Fig. Figures 9A to 9C show another embodiment of a display device and a manufacturing method for it. Fig. 9A and Fig. 9B explain a step in which a transparent laminated body 6 is formed by two or more transparent substrates 1 which are bonded together with a hot-melt adhesive film 5. Fig. Figure 9C shows the display device formed by bonding the transparent laminated body 6 and an image display body 2. In the case of the one in Fig. In the display device shown in Figures 9A to 9C, the transparent laminated body 6 comprises substances that form a pattern between two or more transparent substrates 1. Therefore, the structure is improved. The same structure as that of the embodiment described above is designated with the same reference numerals, and the description is omitted.

[0067] In a Fig. In the example shown in Figures 9A to 9C, a layer of the heat-activated adhesive film 5 is arranged sandwich-like between the transparent substrates 1 and is composed of several types of heat-activated adhesive films 5. A first heat-activated adhesive film 5A is located at a central region, and a second heat-activated adhesive film 5B is located at an edge region. The second heat-activated adhesive film 5B can be frame-shaped and arranged on a frame portion of one of the transparent substrates 1. The second heat-activated adhesive film 5B can consist of several long film components or a single film component with a frame shape; from a manufacturability standpoint, the former is preferred.

[0068] The first heat-activated adhesive film 5A can be composed of heat-activated adhesive film 5, which, for example, becomes clear and colorless after heat bonding. The second heat-activated adhesive film(s) 5B can be composed of heat-activated adhesive film 5, which, for example, becomes clear and colored after heat bonding. The color of the second heat-activated adhesive film(s) 5B after heat bonding can be a suitable color, such as milky, red, blue, or green. The color of the second heat-activated adhesive film(s) 5B after heat bonding can also be translucent or opaque. As a result, the second heat-activated adhesive film(s) 5B are positioned at the edge region, and even if the transparency of this region is low or this region is opaque, the image can be displayed.

[0069] The second hot-melt adhesive film(s) 5B contains pattern substances 21. The pattern substances 21 embedded in the second hot-melt adhesive film(s) 5B are formed from the substance to indicate a suitable color. For example, the pattern substances 21 can be formed from pigment or the like. Therefore, when the transparent substrates 1 are bonded to the hot-melt adhesive film 5, a pattern derived from the second hot-melt adhesive film(s) 5B can be formed.

[0070] Furthermore, in the example of Fig. In embodiments 9A to 9C, the pattern substances 21 are provided on an inner surface of an externally arranged transparent substrate 1 by means of printing layers 22. The printing layers 22 can be the same as those described above. In the transparent substrates 1, which are glued and integrated together, the pattern substances 21 formed from the printing layers 22 are embedded in the second hot-melt adhesive film 5B. It should be noted that the layers 22 may be omitted. In this case, a pattern can be formed using several types of hot-melt adhesive films 5.

[0071] The production of the in Fig. The display device shown in Figures 9A to 9C can be manufactured using the hot melt adhesive film(s) 5B containing the pattern substances 21 and the hot melt adhesive film 5A not containing pattern substances 21. The outer transparent substrate 1 can have the printing layers 22. During the manufacturing process, in which the hot melt adhesive films 5 are joined, two or more hot melt adhesive films 5 (the first hot melt adhesive film 5A and the second hot melt adhesive film(s) 5B) are arranged adjacent to each other. Two or more hot melt adhesive films 5 are arranged in one plane. By heating and pressing, two or more hot melt adhesive films 5 are softened, and the transparent substrates 1 are bonded together. The integrated hot melt adhesive films 5 form an adhesive layer.Bonding the transparent laminated body 6 to the image-display body 2 and forming the resin layer 3 can be carried out using the same method as in the embodiments described above. In the case of using several types of heat-activated adhesive films 5, a pattern can easily be formed using heat bonding.

[0072] Fig. Figures 10A to 10C show a further embodiment of a display device and a manufacturing method for it. Fig. 10A and Fig. 10B explains a step in which a transparent laminated body 6 is formed by two or more transparent substrates 1 which are bonded together with hot melt adhesive films 5. Fig. Figure 10C shows the display device formed by bonding a transparent laminated body 6 and an image display body 2. In the case of the one in Fig. In the display device shown in Figures 10A to 10C, the transparent laminated body 6 comprises substances that form a pattern between two or more transparent substrates 1. Therefore, the structure is improved. The same structure as that of the preceding embodiments is designated with the same reference numerals, and its description is omitted.

[0073] In a Fig. In the example shown in Figures 10A to 10C, pattern substances 21 are provided between the hot melt adhesive films 5. The pattern substances 21 can, for example, be composed of fibers 23. In the case where the pattern substances 21 are composed of fibers 23, a well-designed pattern can be easily formed. Short fibers are preferably used as the fibers 23. The pattern substances 21 include multiple fibers 23. The fibers 23 can be composed of a single fiber type or multiple fiber types. The fibers 23 can be monochromatic or multicolored. The fibers 23 can include inorganic fibers or organic fibers. The fibers 23 can also include plant-derived fibers.

[0074] In Fig. In steps 10A to 10C, fibers 23 are provided as a pattern substance 21 between two transparent substrates 1 using two hot-melt adhesive films 5. A pattern can be easily formed from the pattern substances 21 provided between the hot-melt adhesive films 5. Even when a pattern is composed of fibers 23, a fine and rich design, similar to Japanese paper, can be created, as a non-uniform opaque pattern can be formed using the fibers 23.

[0075] The production of the in Fig. The display device shown in Figures 10A to 10C can be implemented by bonding the transparent substrates 1 with two or more hot-melt adhesive films 5 containing the fibers 23, which represent the pattern substances 21 between them. The fibers 23 can be arranged, for example, by sprinkling them onto one of the hot-melt adhesive films 5. Fig. 10A to 10C, although an example of the display device in which the pattern substances 21 are arranged at the edge, if there is no obstruction to the viewing conditions of a screen, the pattern substances 21 can be arranged in the central region of the display device. For example, in the case of pattern substances 21 that have transparency, which are arranged because the image can also be seen when the image overlaps a pattern, a design based on a pattern can be obtained. The pattern substances 21 can be embedded in a layer of the hot-melt adhesive films 5, which are glued together and become one when the transparent laminated body 6 is formed. In Fig. In Figure 10C, the hot melt adhesive films 5 are glued together, and to illustrate this, the boundary line of the hot melt adhesive films 5, which are arranged in layers, is not shown. Integrated hot melt adhesive films 5 are composed of an adhesive layer. The bonding of the transparent laminated body 6 to the image-display body 2 and the formation of a resin layer 3 can be carried out by the same method as in the embodiments described above.

[0076] Furthermore, in Fig. In sections 10A to 10C, although the fibers 23 are described as pattern substances 21 sandwiched between the hot-melt adhesive films 5, not only the fibers 23 but also various other substances can be used as pattern substances 21 sandwiched between the hot-melt adhesive films 5. For example, a piece of a leaf, a flower, or the like, as well as a piece of paper, can be given as examples. In short, since thin crumbs can be held between the hot-melt adhesive films 5 by insertion, crumbs can be used as pattern substances 21. In the case of the hot-melt adhesive films 5 used above, since the pattern substances 21 can be arranged in a state where the hot-melt adhesive films 5 do not exhibit stickiness, pattern alignment can be carried out more easily.

[0077] Fig. Figures 11A to 11C show a further embodiment of a display device and a manufacturing method for it. Fig. 11A and Fig. 11B explains a step in which a transparent laminated body 6 is formed by two or more transparent substrates 1 which are bonded together with hot melt adhesive films 5. Fig. Figure 11C shows the display device formed by bonding the transparent laminated body 6 and the image-display body 2. In the case of the one shown in Fig. In the display device shown in Figures 11A to 11C, the transparent laminated body 6 is composed of three transparent substrates 1. The structure is the same as that of the preceding embodiments and is designated with the same reference numerals, and its description is omitted.

[0078] The number of transparent substrates 1 enclosed within the transparent laminated body 6 can be 3 or more. In one in Fig. In the example shown in Figures 11A to 11C, the transparent laminated body 6 is composed of three transparent substrates 1. Each of the transparent substrates 1 is sandwiched between them with the hot melt adhesive films 5. The number of transparent substrates 1 that make up the transparent laminated body 6 can, of course, be 4 or more, as well as 5 or more. There is no upper limit to the number of transparent substrates 1 that make up the transparent laminated body 6; for example, from a manufacturability standpoint, the number of transparent substrates 1 could be 10 or less.

[0079] The hot-melt adhesive films 5 are placed between the transparent substrates 1 in Fig. 11A to 11C are provided, using two hot melt adhesive films 5. That is, the number of hot melt adhesive films 5 can be 1 less than the number of transparent substrates 1. It should be noted that, as in the example of Fig. 9A to 9C several types of hot melt adhesive films 5 between transparent substrates 1 can be provided in a planar manner, or as in the example of Fig. In 10A to 10C, two or more hot-melt adhesive films 5 can be arranged in layers between the transparent substrates 1. In this case, the number of layers formed from the hot-melt adhesive films 5 can be 1 less than the number of transparent substrates 1.

[0080] In cases where the number of transparent substrates 1 comprising the transparent laminated body 6 is three or more, the strength of the transparent laminated body 6 can be improved, and the protection of the device enhanced. For example, the transparent laminated body 6 can be formed by layering transparent substrates 1 made of resin, such as polycarbonate, and laminated glass composed of two panes of glass. In this case, the resin-based transparent substrates 1 can be placed on the outside. The transparent laminated body 6 can also consist of multiple panes of glass, composed of three or more panes of glass bonded together.

[0081] The transparent laminated body 6 can contain substances that form a pattern between two or more transparent substrates 1. In this case, the structure can be improved. The pattern can be formed from pattern substances 21. An embodiment in which a pattern is formed can be similar to that of the embodiments mentioned above. For example, a pattern can be formed by printing on at least one of a transparent substrate 1 and a heat-activated adhesive film 5, mixing in particles such as fibers 23, and using several types of heat-activated adhesive films 5.

[0082] In the case of using three transparent substrates 1, the spacer between the transparent substrates 1 comprises two spacers, composed of an outer spacer and an inner spacer. In this case, a complete pattern can be formed by superimposing an outer pattern of spacers between the transparent substrates 1 and an inner pattern of spacers between the transparent substrates 1. For example, as a result of printing layers 22 applied between two or more transparent substrates 1 and a pattern applied to parts of the transparent laminated body 6 with varying thicknesses, a pattern with varying coverage can be formed, and the structure can be improved.

[0083] In the case where one pattern is provided on parts of the transparent laminated body 6 of different thicknesses, a different pattern substance 21 can be provided on a part of a different thickness. For example, the entire pattern can be formed by one of the fibers 23 provided in an outer spacer between the transparent substrates 1, one of the printing layers 22 provided in an inner spacer between the transparent substrates 1, and these patterns superimposed on one another.

[0084] In the case where the transparent laminated body 6 is composed of three or more transparent substrates 1, the transparent substrates 1 must be arranged in layers with higher accuracy compared to the case where it is composed of two transparent substrates 1. In particular, when the pattern materials 21 are placed between two or more transparent substrates 1, positioning, bonding, and integration are important to prevent the formation of a gap or void in the pattern in a vertical direction. As a result of using the aforementioned hot-melt adhesive films 5, it is possible to stack and bond the transparent substrates 1 and hot-melt adhesive films 5 with high positional accuracy. Therefore, it is possible to construct the display device with less displacement of the pattern and component positions, which is well-designed.

[0085] The production of the in Fig. The display device shown in Figures 11A to 11C can be constructed by bonding three or more transparent substrates 1 together with the interpenetrating hot-melt adhesive film 5. In the case of using pattern substances 21, the pattern substances 21 can be provided between the transparent substrates 1 by the similar method described above. Bonding the transparent laminated body 6 and the image display body 2 and forming a resin layer 3 can be carried out by the same method described in the preceding embodiments.

[0086] Fig. Figure 12 shows another embodiment of a display device. This display device includes a touch sensor 10 on a surface which faces an image display body 2 made of a transparent laminated body 6. Another design can be the same as that shown in Figure 12. Fig. 1A and Fig. The display device shown in Figure 1B is identical in structure to the embodiments mentioned above, with the same reference numerals, and its description is omitted.

[0087] In the preferred embodiment, the display device includes a touch sensor 10. In this case, the display device is a display device equipped with a touch sensor. As a result of using the touch sensor 10 by a touch material, such as a finger or a stylus, while touching a surface of the transparent laminated body 6, the input method can be carried out, and the functionality can be improved.

[0088] The touch sensor 10 is preferably an electrostatic capacitance sensor. The touch sensor 10 preferably transmits light of a wavelength that causes the photocurable resin to cure. A supporting material for the touch sensor 10 can be the transparent laminated body 6. The touch sensor 10 can be composed of two paired electrode layers made of electrically conductive guide wires stacked in the thickness direction.

[0089] The production of the in Fig. The display device shown in Figure 12, equipped with a touch sensor, can be produced by forming the transparent laminated body 6 using two or more transparent substrates 1 and by forming the touch sensor 10 using this transparent laminated body 6 as a support substrate. The formation of the touch sensor 10 on a surface of the transparent laminated body 6 can be achieved by bonding the substrate-supporting electrodes of the touch sensor 10 and the transparent laminated body 6 with, for example, a hot-melt adhesive film 5. Here, two substrates supporting corresponding types of electrodes can be bonded simultaneously with the hot-melt adhesive film 5. Bonding the transparent laminated body 6 and an image display body 2 can be carried out using the same method as described above. Heating and compression can be performed by vacuum pressing.Since the transparent substrate 1 is used in this process, the touch sensor 10 can be easily formed with high positional accuracy. If the hot melt adhesive film 5 transmits light of a wavelength at which the photocurable resin is cured, and if the optical transmittance at a wavelength of 395 nm is 50% or more and the optical transmittance at a wavelength of 365 nm is 10% or less, the resin layer 3 can also be easily formed by curing the photocurable resin. Consequently, a display device equipped with a touch sensor can be easily formed.

[0090] During the production of the in Fig.In the display device shown in Figure 12, equipped with a touch sensor, the transparent laminated body 6 and the touch sensor 10 can be formed simultaneously. For example, two or more transparent substrates 1 and two or more substrates supporting the electrodes can be stacked with the interposed hot-melt adhesive film 5, and heating and pressing can be performed. In this case, the hot-melt adhesive film 5 located between the components exhibits tackiness, and the transparent laminated body 6 and the touch sensor 10 are formed at the same time. Since the transparent laminated body 6 and the touch sensor 10 can be formed simultaneously in this process, manufacturing can be carried out efficiently. In this case, also as a result of using the hot-melt adhesive film 5, which is not tacky before heating, tackiness with high positional accuracy can be provided.As a result of using the above-described hot-melt adhesive film 5, the photocurable resin can also be cured.

[0091] Each display device according to the embodiment described above can be used as a display, such as a display, and can be employed in various applications. For example, the display device can be mounted on a wall or attached to furniture. In such a case, it is preferred to design an embedded display device. The display device enables the display of an image on a large screen and is attached to a building structure or furniture, the design of which can be improved.

Claims

[1] Display device, comprising: a transparent laminated body (6) formed from transparent substrates (1) arranged in layers; a picture display body (2) that points towards the transparent laminated body (6); and a resin layer (3) located between the transparent laminated body (6) and the image display body (2) and made of a photocurable resin, wherein the transparent substrates (1) are bonded with a hot-melt adhesive film (5), and the hot-melt adhesive film (5) has an optical transmittance of 50% or more at a wavelength of 395 nm and an optical transmittance of 10% or less at a wavelength of 365 nm. [2] Display device according to claim 1, wherein the transparent laminated body (6) comprises a pattern-forming substance between transparent substrates (1). [3] Display device according to claim 1 or 2, wherein the heat-activated adhesive film (5) comprises at least one of an ethylene-vinyl acetate copolymer and polyvinyl butyral as the main component and an ultraviolet absorber. [4] Method for manufacturing a display device, comprising: a step to arrange a transparent substrate in which transparent substrates (1) are arranged in layers, wherein a hot-melt adhesive film (5) having an optical transmittance of 50% or more at a wavelength of 395 nm and an optical transmittance of 10% or less at a wavelength of 365 nm, is positioned in between; a bonding step in which the transparent substrates (1) are bonded by heating and pressing, forming a transparent laminated body (6); and a resin curing step in which the transparent laminated body (6) and an image display body (2) are stacked in layers with a photocurable resin located between the transparent laminated body (6) and the image display body (2) and the photocurable resin is cured with light from one side of the transparent laminated body (6). [5] Method for manufacturing a display device according to claim 4, wherein the hot melt adhesive film (5) comprises at least one of an ethylene-vinyl acetate copolymer and polyvinyl butyral as the main component and an ultraviolet absorber, and The light used to perform the resin curing step has a peak wavelength of 390 to 410 nm.

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