JP2020112619A - Image display device and manufacturing method of image display device - Google Patents

Abstract

To provide an image display device and a manufacturing method of the image display device which can improve the efficiency of a manufacturing process.SOLUTION: An image display device 100 includes: an image display panel 10 which has an image display region D being a region on which an image is displayed; a transparent protective plate 20 which is provided on the image display region D; a first spacer part 21 which is integrally formed with the transparent protective plate 20 in the image display region D on a surface facing the image display panel 10 of the transparent protective plate 20; and a transparent adhesive layer 30 which is provided between the image display panel 10 and the transparent protective plate 20.SELECTED DRAWING: Figure 1

Description

The present invention relates to an image display device having a transparent protective plate on the front side of an image display panel.

The image display device has an image display panel such as a liquid crystal panel or an organic EL (Electro-Luminescence) panel for displaying an image. The image display device has a front surface constituting a screen of the image display panel from an impact or the like. For protection, there is one in which a transparent protective plate such as glass or transparent resin is provided on the front side of the image display panel. In such an image display device, by providing a transparent adhesive layer between the front surface of the image display panel and the transparent protective plate, a predetermined gap is secured between the front surface of the image display panel and the transparent protective plate, The impact applied from the device is not directly applied to the front surface of the image display panel, but is mitigated.

In a conventional image display device, transparent spherical spacers made of glass fibers, glass beads, or resin beads and having a diameter of 100 μm are dispersed in order to maintain a space between the front surface of the image display panel and the transparent protective plate. A transparent adhesive layer was used. With the spherical spacer, a space of 100 μm is secured between the front surface of the image display panel and the transparent protective plate, so that the thickness of the transparent adhesive layer can be set to a specific thickness or more (for example, see Patent Document 1) ).

JP, 2013-29572, A

However, in the conventional image display device described in Patent Document 1, glass fibers, glass beads, resin beads, or the like are preliminarily provided with a transparent adhesive in order to maintain the distance between the front surface of the image display panel and the transparent protective plate. However, there is a problem that it is difficult to increase the efficiency of the manufacturing process because a step of dispersing the glass fiber, glass beads or resin beads on the image display panel or on the transparent protective plate is required. ..

The present invention has been made to solve the above problems, and an object of the present invention is to provide an image display device and a method for manufacturing the image display device, which can make the manufacturing process efficient.

The image display device according to the present invention faces an image display panel having an image display area which is an area where an image is displayed, a transparent protective plate provided on the image display area, and an image display panel of the transparent protective plate. A first spacer portion integrally formed with the transparent protective plate in the image display area of the surface, and a transparent adhesive layer provided between the image display panel and the transparent protective plate.

A method of manufacturing an image display device according to the present invention includes a step of disposing a liquid synthetic resin on a surface of a transparent protective plate integrally formed with a first spacer portion on which the first spacer portion is formed, and a first spacer portion. A step of disposing the transparent protective plate and an image display panel having an image display area which is an area where an image is displayed so as to face each other, and a step of curing a liquid synthetic resin to form a transparent adhesive layer. , Is provided.

A method for manufacturing an image display device according to the present invention is a liquid protective liquid crystal on a second spacer portion of a transparent protective plate integrally formed with a first spacer portion and a second spacer portion partially provided with an opening. A step of disposing a synthetic resin, a step of disposing a transparent protective plate and an image display panel having an image display area where an image is displayed so as to sandwich the first spacer portion, and a second spacer A step of curing the liquid synthetic resin disposed on the part to form a transparent adhesive layer, a step of filling the space between the transparent protective plate and the image display panel with the liquid synthetic resin from the opening, and a transparent protective plate. And curing the liquid synthetic resin filled in the space between the image display panel and the transparent adhesive layer.

According to the image display device of the present invention, it is possible to provide an image display device with high production efficiency.

Further, according to the method for manufacturing an image display device of the present invention, it is possible to provide a method for manufacturing an image display device with high production efficiency.

FIG. 3 is a cross-sectional view showing the configuration of the image display device according to the first embodiment of the present invention. FIG. 2 is a plan sectional view showing the configuration of the image display device according to the first embodiment of the present invention. FIG. 6 is a cross-sectional view showing the method of manufacturing the image display device according to the first embodiment of the present invention. It is a plane sectional view showing a modification of the image display device concerning Embodiment 1 of the present invention. FIG. 6 is a cross-sectional view showing a modified example of the image display device according to the first embodiment of the present invention. FIG. 6 is a cross-sectional view showing a modified example of the image display device according to the first embodiment of the present invention. FIG. 6 is a cross-sectional view showing a modified example of the image display device according to the first embodiment of the present invention. It is a plane sectional view showing the composition of the image display device concerning Embodiment 2 of the present invention. FIG. 7 is a cross-sectional view showing the method of manufacturing the image display device according to the second embodiment of the present invention. It is a plane sectional view showing a modification of the image display device concerning Embodiment 2 of the present invention. It is a plane sectional view showing a modification of the image display device concerning Embodiment 2 of the present invention. FIG. 6 is a cross-sectional view showing a configuration of an image display device according to a third embodiment of the present invention.

Hereinafter, embodiments of an image display device disclosed in the present application will be described in detail with reference to the accompanying drawings. The embodiments described below are examples, and the present invention is not limited to these embodiments.

Embodiment 1.
The configuration of the image display device according to the first embodiment of the present invention will be described. FIG. 1 is a sectional view showing the configuration of the image display device according to the first embodiment of the present invention. 2 is a plan sectional view of the image display device according to Embodiment 1 of the present invention, taken along the plane indicated by the broken line AA in FIG.

In the present invention, the case where the image display panel of the image display device is mainly a liquid crystal panel will be described, but the image display panel may be an image display panel having another configuration such as an organic EL panel or a plasma display panel.

In FIG. 1, the image display device 100 is provided between the image display panel 10, the transparent protective plate 20 arranged on the front side of the image display panel 10, and between the image display panel 10 and the rear surface of the transparent protective plate 20. And a transparent adhesive layer 30. The backlight unit, housing, control board, various connectors, cables, and the like arranged on the back side of the image display panel 10 are omitted for simplification. In the image display device 100 of the present invention, the front side is the side on which the surface of the image display device 100 on which the image is displayed is provided, and the side on which the image displayed on the image display device 100 is observed.

In FIG. 1, the upper side of the paper is the front side and the lower side of the paper is the back side. The front surface of the image display device 100 is referred to as the front surface or screen of the image display device 100, and the front surface of the image display panel 10 is referred to as the front surface or screen of the image display panel 10. The front side or the back side of the screen is called the back side. Further, also in the other constituent members, the front surface is referred to as the front surface of the other constituent member, and the rear surface is referred to as the rear surface of the other constituent member.

Further, in the present invention, the term "upper" does not prevent the presence of inclusions between the constituent elements. For example, when "B provided on A" is described, it includes those in which other component C is provided between A and B and those in which other component C is not provided.

The image display panel 10 includes a color filter substrate made of a glass substrate on which color filters and counter electrodes are omitted for simplification, and a switching element such as a TFT (Thin Film Transistor) array corresponding to each pixel. And an array substrate formed of a glass substrate on which a pixel electrode is formed, and a liquid crystal is provided between these two glass substrates. Usually, the color filter substrate is provided on the front side of the image display panel 10, and the array substrate is provided on the back side. An alignment film is provided on each of the color filter substrate and the array substrate on the side where the liquid crystal is provided, and the liquid crystal molecules are aligned in a predetermined direction. The color filters formed on the color filter substrate and the switching elements formed on the array substrate are formed at positions corresponding to the image display area D which is an area where an image is displayed.

The image display area D is shown in FIGS. The image display area D is an area sandwiched between the broken line B and the broken line C in FIG. 1, and is a rectangular area surrounded by the broken line D in FIG. The image display area D is an area where an image is displayed on the front surface of the image display panel 10. Further, for convenience, in plan view of the image display device 100 viewed from the front side, an area overlapping the image display area D may be referred to as an image display area D even if it is a component other than the image display panel 10. That is, the image display area D is an area in which an image is displayed on the screen that is the front surface of the image display panel 10, but also an area that overlaps the image display area D of the image display panel 10 in the plan view of the image display apparatus 100. The image display area D will be described. Although the example in which the shape of the image display area D is rectangular is shown, the shape of the image display area D is not limited to the rectangular shape, and can be appropriately selected depending on the application.

Further, the image display panel 10 is provided with polarizing plates on the front side and the back side of the image display panel 10 with respect to the color filter substrate and the array substrate, respectively. An electric signal from a control circuit connected to the image display panel 10 controls the switching element formed on the array substrate to control the voltage applied to the liquid crystal provided between the counter electrode and the pixel electrode. As a result, the alignment state of the liquid crystal molecules is controlled, and the amount of light transmitted from the back side to the front side of the image display panel 10 can be controlled.

The transparent protective plate 20 is provided on the image display area D of the image display panel 10. A first spacer portion 21 and a second spacer portion 22 are integrally formed with the transparent protective plate 20 on the surface of the transparent protective plate 20 facing the image display panel 10. The first spacer portion 21 is provided in the image display area D, and is provided near the center of the image display area D. The second spacer portion 22 is formed along the outer periphery of the image display area D. The second spacer portion 22 may be provided outside the image display area D, or a part of the second spacer portion 22 may be provided inside the image display area D.

The transparent protective plate 20, the first spacer portion 21, and the second spacer portion 22 are made of the same material. The transparent protective plate 20, the first spacer portion 21, and the second spacer portion 22 are formed of a material having a high visible light transmittance that allows an image displayed in the image display area D to be visually recognized from the front side, and is, for example, glass or acrylic. Alternatively, it is made of a hard material such as polycarbonate having a refractive index of 1.4 or more and 1.6 or less and a transmittance of visible light of wavelength 400 nm or more and 800 nm or less 90% or more. The transparent protective plate 20 is formed of, for example, a hard material having a Young's modulus of 10 ⁹ Pa or more in order to prevent the force applied to the front surface of the image display device 100 from being transmitted to the front surface of the image display panel 10. Is preferable, and specifically, chemically strengthened glass or polycarbonate having excellent impact resistance is preferable. Further, as a material for forming the transparent protective plate 20, the first spacer portion 21, and the second spacer portion 22, for example, in a state where the transparent protective plate 20, the first spacer portion 21, and the second spacer portion 22 are integrated. Polycarbonate that is easy to mold is more preferable.

The thickness of the transparent protective plate 20 can be appropriately selected depending on the screen size of the image display device 100 or the application, but in order to protect the image display panel 10 from impact while suppressing an increase in weight of the image display device 100, It is preferably 1 mm or more and 3 mm or less.

The thickness of the first spacer portion 21 and the second spacer portion 22 can be appropriately selected depending on the screen size of the image display device 100 or the application, but is 0.1 mm or more and 1 mm or more in order to suppress the filling amount of the transparent adhesive layer 30. The following are preferred. The widths of the first spacer portion 21 and the second spacer portion 22 can be appropriately selected depending on the screen size of the image display device 100 or the application, but are preferably 0.5 mm or more and 2 mm or less.

The transparent protective plate 20 may have a coating film such as an antireflection film, an antiglare film, or a hard coat film formed on the front surface thereof, and is located outside the position facing the image display area D of the image display panel 10 on the rear surface side. A light-shielding portion may be provided in the outer frame area. The transparent protective plate 20 is adhered to the front surface of the image display panel 10 by the transparent adhesive layer 30. Alternatively, the film may be adhered to the front surface side of the transparent protective plate 20, and the coating film may be formed on the film adhered to the transparent protective plate 20.

The transparent protective plate 20 in which the first spacer portion 21 and the second spacer portion 22 are integrally formed is manufactured by, for example, injection molding. Since the shape of the transparent protective plate 20 in which the first spacer portion 21 and the second spacer portion 22 are integrally formed is different depending on the screen size or the application of the image display device 100, it is manufactured by appropriately selecting a mold used for injection formation. To be done. Injection molding is a method in which a molding material is poured into a mold and hardened. It is widely used for plastic materials, but it is also applicable to glass.

The transparent adhesive layer 30 is formed of a material having a high visible light transmittance that allows the image displayed in the image display area D to be visually recognized from the front side. For example, the visible light transmittance is 90% or more, and the refractive index is It is 1.4 or more and 1.6 or less, and is formed of a transparent synthetic resin having a refractive index close to that of the transparent protective plate 20. Specifically, the transparent adhesive layer 30 may be made of a synthetic resin containing silicon such as silicone gel, a synthetic resin containing carbon such as acrylic gel or urethane gel, or a hybrid resin containing silicon and carbon at the same time. Good. The silicone gel has a glass transition point of −120° C. or lower, and has a lower glass transition temperature than a synthetic resin containing carbon such as acrylic gel or urethane gel. Therefore, the operating temperature range of the image display device 100, for example, , It is preferable that the transparent adhesive layer 30 is free from troubles such as peeling (partial peeling) of the transparent adhesive layer 30 even if the temperature cycle is repeated at -40°C to 85°C.

As the transparent adhesive layer 30, an ultraviolet curable type, a thermosetting type, or a room temperature curing type synthetic resin can be used, but from the viewpoint of simplifying the manufacturing process, the transparent adhesive layer 30 is preferably a room temperature curing type synthetic resin, In order to reduce the stress on the screen of the image display panel 10 after curing, a silicone gel having a shrinkage ratio during curing of 1% or less is more preferable.

The transparent adhesive layer 30 is softer than the transparent protective plate 20, and the Young's modulus of the transparent adhesive layer 30 is smaller than that of the transparent protective plate 20. Specifically, the material forming the transparent adhesive layer 30 is preferably a synthetic resin having a Young's modulus of 10 ³ Pa or more and 10 ⁶ Pa or less.

In addition, the material forming the transparent adhesive layer 30 may be, for example, a synthetic resin having a penetration (JIS K2207) of 20 or more and 70 or less and a rigidity of 10 ³ Pa or more and 10 ⁶ Pa or less.

The refractive index of the transparent adhesive layer 30 is preferably smaller than that of the transparent protective plate 20, and more preferably the same as that of the transparent protective plate 20, in order to improve the visibility of the image display device 100. Is set to. Specifically, the difference in refractive index between the transparent adhesive layer 30 and the transparent protective plate 20 is in the range of 0.01, preferably in the range of 0.005, more preferably in the range of 0.005. It is set to fall within the range of 0.001.

The refractive index of the transparent adhesive layer 30 can be adjusted by adding an inorganic filler, forming a nanocomposite of the inorganic filler, imparting an organic functional group, or changing the kind of the solvent for swelling the transparent adhesive layer 30. .. The transparent adhesive layer 30 may contain inorganic fine particles having an average primary particle diameter of 5 nm or more and 25 nm or less in order to adjust the refractive index. Examples of the inorganic fine particles include zirconium oxide, titanium oxide, amorphous silicon, lead sulfide, zinc sulfide and the like. The inorganic fine particles may be subjected to surface modification in order to suppress aggregation and improve dispersibility. As the surface modification, for example, an organic group on the surface of the inorganic fine particles using a silane coupling agent or the like is used. Examples include introduction. The amount of the inorganic fine particles introduced is important for ensuring the transparency of the transparent adhesive layer 30, but the amount of the inorganic fine particles introduced varies depending on the material and particle size of the transparent adhesive layer 30 and the inorganic fine particles. Become.

The transparent adhesive layer 30 is filled between the front surface of the image display panel 10 and the back surface of the transparent protective plate 20 with a thickness of 0.1 mm or more and 1 mm or less without any gap and without generating bubbles. Therefore, the image display device 100 can significantly reduce the reflectance of light at the interface between the transparent protective plate 20 and the transparent adhesive layer 30, and can obtain good visibility.

Next, a method of manufacturing the image display device 100 according to the first embodiment will be described.

FIG. 3 is a cross-sectional view showing the method of manufacturing the image display device 100 according to the first embodiment of the present invention. FIG. 3A is a diagram showing a process of preparing the transparent protective plate 20 in which the first spacer portion 21 and the second spacer portion 22 are integrally formed. FIG. 3B is a diagram showing a process of forming the transparent adhesive layer 30 on the back surface of the transparent protective plate 20. FIG. 3C is a diagram showing a process of adhering the image display panel 10 to the front side of the transparent protective plate 20 to complete the image display device 100.

First, the transparent protective plate 20 is prepared as shown in FIG. At this time, the transparent protective plate 20 is placed so that the back side is on the upper side, that is, the first spacer section 21 and the second spacer section 22 are on the upper side.

Next, as shown in FIG. 3B, a transparent adhesive layer 30 is formed using a liquid synthetic resin on the rear surface side of the transparent protective plate 20 and the side where the first spacer portion 21 is formed. Specifically, the transparent adhesive layer 30 is formed using a thermosetting or ultraviolet curable liquid silicone resin or a liquid hydrocarbon resin containing hydrocarbon as a main component. Here, the case where the transparent adhesive layer 30 is formed of a silicone gel will be described, but the case where the transparent adhesive layer 30 is formed of a hydrocarbon gel can be formed by the same method.

The liquid silicone resin for forming the transparent adhesive layer 30 preferably has a viscosity before curing of 50 mPa·s or more and 5000 mPa·s or less in order to improve the smoothness of the coated surface and the fluidity during coating. The liquid silicone resin for forming the transparent adhesive layer 30 is applied to a predetermined position by using an air type or mechanical type dispenser.

Next, as shown in FIG. 3C, the image display panel 10 is arranged on the back side of the transparent adhesive layer 30, and the transparent adhesive layer 30 and the image display panel 10 are bonded together without a gap. After the transparent adhesive layer 30 and the image display panel 10 are bonded together without a gap, the transparent adhesive layer 30 is cured while defoaming the bubbles in the transparent adhesive layer 30 under reduced pressure. After the transparent adhesive layer 30 is cured, an autoclave process of uniformly applying a pressure of about 0.2 MPa to the image display device 100 is performed for about several minutes to 20 minutes to remove bubbles in the transparent adhesive layer 30.

Further, in the method of manufacturing the image display device 100 according to the first embodiment shown in FIG. 3, a method of bonding the image display panel 10 and the transparent adhesive layer 30 and then hardening the transparent adhesive layer 30 is used. After the transparent adhesive layer 30 is cured, the image display panel 10 and the transparent adhesive layer 30 may be bonded together under reduced pressure.

Next, the function and effect of the image display device 100 of the present invention will be described. The operation and effect of the image display device of the present invention will be described in comparison with a conventional image display device.

In the conventional image display device, as the screen size of the image display device becomes larger, a spacer or the like for maintaining the space between the transparent protective plate 20 and the image display panel 10 in the image display area D is indispensable. .. Therefore, not only the step of forming the transparent adhesive layer 30 but also the spacer forming step is required, and the image display device capable of maintaining the gap between the transparent protective plate 20 and the image display panel 10 can be manufactured with high efficiency. The problem was difficult.

Further, in the conventional image display device, the transparent protective plate 20 and the spacer for maintaining the space between the transparent protective plate 20 and the image display panel 10 in the image display area D are not integrally formed. The problem is that the number of optical interfaces is increased and the visibility is lowered.

On the other hand, in the image display device 100 according to the first embodiment, since the first spacer portion 21 and the second spacer portion 22 are formed integrally with the transparent protective plate 20 at the stage of molding the transparent protective plate 20, the spacer formation is performed. It is possible to manufacture the image display device 100 capable of maintaining the space between the transparent protective plate 20 and the image display panel 10 with high efficiency without the need to provide separate steps.

Further, in the image display device 100 according to the first embodiment, the first spacer portion 21 and the second spacer portion 22 are formed integrally with the transparent protective plate 20, so that the optical interface is smaller than that in the conventional image display device. Visibility is improved.

The image display device 100 according to the first embodiment includes an image display panel having an image display area that is an area in which an image is displayed, a transparent protective plate provided on the image display area, and an image display panel of the transparent protective plate. A first spacer portion integrally formed with the transparent protective plate in the image display area on the surface opposite to the surface; and a transparent adhesive layer provided between the image display panel and the transparent protective plate.

In addition, the image display device 100 according to the first embodiment further includes a second spacer portion integrally formed with the transparent protection plate along the outer periphery of the image display area between the image display panel and the transparent protection plate. ..

Further, the image display device 100 according to the first embodiment is characterized in that the transparent protective plate and the first spacer portion are made of the same material.

Further, the image display device 100 according to the first embodiment is characterized in that the difference in refractive index between the transparent protective plate and the transparent adhesive layer is 0.05 or less.

Further, the image display device 100 according to the first embodiment is characterized in that the Young's modulus of the transparent adhesive layer is 10 ³ Pa or more and 10 ⁶ Pa or less.

With the above configuration, the image display device 100 according to the first embodiment can provide an image display device with high production efficiency.

The method for manufacturing the image display device 100 according to the first embodiment includes a step of disposing a liquid synthetic resin on a surface of the transparent protective plate integrally formed with the first spacer portion on which the first spacer portion is formed, 1 step of arranging a transparent protective plate and an image display panel having an image display area, which is an area where an image is displayed, so as to sandwich a spacer portion; and a step of curing a liquid synthetic resin to form a transparent adhesive layer And a step of performing.

With the above configuration, the method for manufacturing the image display device 100 according to the first embodiment can provide a method for manufacturing an image display device with high production efficiency.

Next, a modified example of the image display device 100 according to the first embodiment will be described. 4 to 7 are diagrams showing modified examples of the image display device 100 according to the first embodiment of the present invention.

FIG. 4 is a diagram showing a modification of the pattern shape of the first spacer portion 21 of the image display device 100 according to the first embodiment. As shown in FIG. 4, the first spacer portion 21 of the image display device 101 is characterized in that it is formed in the image display region D, and the shape of the first spacer portion 21 is not particularly limited. It can be arbitrarily selected depending on the method of forming the transparent adhesive layer 30 and the type of the method of laminating it with the image display panel 10.

FIG. 5 is a diagram showing a modification of the cross-sectional shape of the first spacer portion 21 of the image display device 100 according to the first embodiment. The first spacer portion 21 can be arbitrarily selected from not only a rectangular sectional shape as shown in FIG. 1 but also a hemispherical sectional shape as shown in FIG.

6 and 7 are diagrams showing modified examples of the shapes of the transparent protective plate 20 and the image display panel 10 of the image display device 100 according to the first embodiment. As shown in FIG. 6, the front surface of the transparent protective plate 20 of the image display device 103 has a concave curved surface, and the image display panel 10 also has a concave curved surface. Further, as shown in FIG. 7, the front surface of the transparent protective plate 20 of the image display device 104 is a concave curved surface, and the image display panel 10 is a flat surface. The thickness of the first spacer portion 21 and the second spacer portion 22 of the transparent protective plate 20 is set to the curvature of the transparent protective plate 20 and the image display panel 10, and the positions where the first spacer portion 21 and the second spacer portion 22 are formed. The image display panel is not limited to the case where the image display area D of the transparent protection plate 20 is a flat surface, but is appropriately adjusted according to the above, even when the image display area D of the transparent protection plate 20 is a curved surface. The space between 10 and the transparent protective plate 20 can be maintained.

As a modification of the shapes of the transparent protective plate 20 and the image display panel 10 of the image display device 100 according to the first embodiment, the image display area D of the transparent protective plate 20 has a concave shape as shown in FIGS. 6 and 7. The case where the image display area D of the transparent protective plate 20 is a convex curved surface or the image display area D of the transparent protective plate 20 is an S-shaped curved surface has been described. Similarly, the space between the image display panel 10 and the transparent protective plate 20 can be maintained.

Embodiment 2.
The configuration of the image display device according to the second embodiment of the present invention will be described. It should be noted that description of configurations that are the same as or corresponding to those of the first embodiment will be omitted, and only different portions will be described.

FIG. 8 is a plan sectional view showing the image display device 200 according to the second embodiment. The plan sectional view of FIG. 8 corresponds to FIG. 2 shown in the first embodiment. In FIG. 8, the same reference numerals as those in FIG. 2 denote the same or corresponding configurations.

The image display device 200 according to the second embodiment has a configuration in which an opening 23 is provided in a part of the second spacer portion 22 provided along the outer periphery of the image display area D.

As shown in FIG. 8, in the image display device 200, the second spacer portion 22 provided along the outer periphery of the image display region D is not partially formed on one side of the outer periphery of the image display region D. An opening 23 is provided in the two spacer portion 22. Part of the synthetic resin forming the transparent adhesive layer 30 has entered the opening 23. Other configurations are the same as those of the image display device 100 shown in the first embodiment.

The image display device 200 is manufactured by a manufacturing method different from that of the image display device 100 described in the first embodiment because the opening 23 is provided on one side of the outer periphery of the image display region D without forming the second spacer part 22. can do. The method of manufacturing the image display device 200 according to the second embodiment will be described below. However, description of the same parts as those in the method of manufacturing the image display device 100 described in the first embodiment will be omitted.

FIG. 9 is a sectional view showing the method of manufacturing the image display device 200 according to the second embodiment. In FIG. 9, the same reference numerals as those in FIG. 3 of the first embodiment indicate the same or corresponding configurations. The process of preparing the transparent protective plate 20 is the same as the process shown in FIG. FIG. 9A is a diagram showing a process of forming the transparent adhesive layer 30 on the first spacer portion 21 and the second spacer portion 22 of the transparent protective plate 20. FIG. 9B is a diagram showing a step of disposing the image display panel 10 on the transparent adhesive layer 30 formed on the first spacer portion 21 and the second spacer portion 22. FIG. 9C is a diagram showing a process of filling the space between the image display panel 10 and the transparent protective plate 20 with liquid synthetic resin for forming the transparent adhesive layer 30 to complete the image display device 200. is there.

First, as shown in FIG. 9A, a liquid synthetic resin is applied on the first spacer portion 21 and the second spacer portion 22 formed on the back surface of the transparent protective plate 20. As described in the first embodiment, the liquid synthetic resin is, for example, a thermosetting or ultraviolet curable silicone resin, and is applied using a dispenser or the like so that the height is constant.

Next, as shown in FIG. 9B, the image display panel 10 is arranged on the liquid silicone resin formed on the first spacer portion 21 and the second spacer portion 22. After that, the liquid silicone resin is cured by heating or ultraviolet irradiation to form the transparent adhesive layer 30 made of silicone gel. As a result, the image display panel 10 and the transparent protective plate 20 are bonded together by the transparent adhesive layer 30 formed on the first spacer portion 21 and the second spacer portion 22. In a state where the image display panel 10 and the transparent protective plate 20 are adhered by the transparent adhesive layer 30, the opening 23 has a space between the image display panel 10 and the transparent protective plate 20 in the image display area D and an external portion. Communicates with the area.

Next, as shown in FIG. 9C, the space between the image display panel 10 and the transparent protective plate 20 is filled with a liquid silicone resin for forming the transparent adhesive layer 30, and the liquid silicone resin is heated or irradiated with ultraviolet rays to be liquid. The silicone resin is cured to form the transparent adhesive layer 30 made of silicone gel in the space between the image display panel 10 and the transparent protective plate 20.

The liquid silicone resin before curing which becomes the transparent adhesive layer 30 filled from the opening 23 is a liquid silicone resin having a viscosity before curing of 50 mPa·s or more and 5000 mPa·s or less as described in the first embodiment. Well, any of a thermosetting type, an ultraviolet curing type and a room temperature curing type may be used.

Here, when the space between the image display panel 10 and the transparent protective plate 20 is filled with the liquid silicone resin from the opening 23, an image obtained by adhering the transparent protective plate 20 so that the opening 23 faces upward. It is preferable to fix the display panel 10. Specifically, in order to prevent the transparent protective plate 20 from peeling off from the image display panel 10 when the image display panel 10 is stood up, the back surface of the image display panel 10 and the front surface of the transparent protective plate 20 are sandwiched. Use a jig to fix. The second spacer portion 22 provided on the outer periphery of the image display area D is provided between the back surface of the image display panel 10 and the front surface of the transparent protective plate 20 by using a jig so that the opening 23 faces vertically upward. It is only necessary that it be provided so as to surround the outer periphery of the image display area D below the vertical position of the opening 23 in the state of sandwiching.

The image display panel 10 to which the transparent protective plate 20 is adhered is fixed so that the opening 23 faces upward, and the liquid silicone resin is introduced into the space between the image display panel 10 and the transparent protective plate 20 from the opening 23. By injecting, it is possible to prevent the liquid silicone from being discharged from the opening 23.

Further, the image display panel 10 to which the transparent protective plate 20 is bonded is fixed so that the opening 23 faces upward, and the liquid silicone resin for forming the transparent adhesive layer 30 is injected from the opening 23. Air does not remain below the first spacer portion 21, and the transparent adhesive layer 30 can be provided around the first spacer portion 21 without any gap. Therefore, since the liquid silicone resin can be filled without generating bubbles, it is not necessary to degas bubbles in the transparent adhesive layer 30 under reduced pressure when the image display panel 10 and the transparent adhesive layer 30 are bonded together. A method for manufacturing an image display device with high production efficiency can be provided.

Further, as shown in FIG. 8, the first spacer portion 21 is formed in a plurality of parallel line segment shapes, and the longitudinal direction of each first spacer portion 21 is the second spacer portion 22 provided with the opening 23. By being provided so as to be orthogonal to the sides of the liquid crystal module, the liquid silicone resin for forming the transparent adhesive layer 30 by injecting the liquid crystal module with the opening 23 facing upward is injected through the opening 23. Air does not remain below the first spacer portion 21, and the transparent adhesive layer 30 can be provided around the first spacer portion 21 without any gap. That is, it is preferable that the first spacer portion 21 has a line segment shape provided such that the longitudinal direction thereof is orthogonal to the side of the second spacer portion 22 provided with the opening 23.

In the method of manufacturing the image display device 200 according to the second embodiment, the image display device 200 has the image display panel 10 and the transparent protective plate 20 when the steps shown in FIGS. 9A and 9B are completed. It is sufficient that the space between and can be filled with the liquid silicone resin for forming the transparent adhesive layer 30 from the opening 23. Therefore, the manufacturing method of the image display device 200 shown in FIG. 9A shows a step of applying the liquid synthetic resin on the first spacer portion 21 and the second spacer portion 22 formed on the back surface of the transparent protective plate 20. However, it is sufficient to apply the liquid synthetic resin on at least the second spacer portion 22.

Further, in the method of manufacturing the image display device 200 shown in FIG. 9B, a method of curing the liquid silicone resin after disposing the image display panel 10 on the liquid silicone resin is shown. By using a material having high tackiness or tackiness (stickiness) as the liquid silicone resin for forming, the liquid silicone resin is cured to form the transparent adhesive layer 30 before the image display panel 10 is arranged, and then the image is formed. The display panel 10 may be arranged and adhered.

The second spacer portion of the image display device 200 according to the second embodiment is characterized in that an opening is provided in a part along the outer periphery of the image display area.

Further, the image display device 200 according to the second embodiment is characterized in that a plurality of openings are provided.

With the above configuration, the image display device 200 according to the second embodiment can provide an image display device with high production efficiency.

The method for manufacturing the image display device 200 according to the second embodiment includes a second spacer portion of a transparent protective plate integrally formed with a first spacer portion and a second spacer portion having an opening in a part thereof. A step of disposing a liquid synthetic resin thereon, and a step of disposing a transparent protective plate and an image display panel having an image display area which is an area where an image is displayed so as to sandwich the first spacer portion, A step of curing the liquid synthetic resin disposed on the second spacer portion to form a transparent adhesive layer; a step of filling the space between the transparent protective plate and the image display panel with the liquid synthetic resin from the opening; And curing the liquid synthetic resin filled in the space between the protective plate and the image display panel to form a transparent adhesive layer.

Further, in the method of manufacturing the image display device 200 according to the second embodiment, the second spacer portion is formed along the outer periphery of the image display area, and the transparent protective plate and the image display are arranged with the opening facing upward. It is characterized in that the space between the panel and the panel is filled with liquid synthetic resin.

In the method of manufacturing the image display device 200 according to the second embodiment having the above-described configuration, the liquid synthetic resin that forms the transparent adhesive layer 30 before curing is filled from the opening 23, and thus the image display panel 10 and the transparent protective plate. Since the liquid synthetic resin can be filled in the space surrounded by the second spacer portion 22 and the space 20 without any gaps and no bubbles are generated, a reduced pressure is applied when the image display panel 10 and the transparent adhesive layer 30 are bonded together. Therefore, it is not necessary to degas bubbles in the transparent adhesive layer 30, and a method for manufacturing an image display device with high production efficiency can be provided.

Next, a modified example of the image display device 200 according to the second embodiment will be described.

10 and 11 are plan sectional views showing modifications of the pattern shape of the first spacer portion 21 of the image display device 200 according to Embodiment 2 of the present invention. In the image display device 201 shown in FIG. 10, the circular first spacer portion 21 is formed in the image display area D. In the configuration of the first spacer portion 21 shown in FIG. 10, air is unlikely to accumulate under the first spacer portion 21, and the transparent adhesive layer 30 can be provided around the first spacer portion 21 without any gap.

The image display device 202 shown in FIG. 11 has two openings 23 on one side of the outer periphery where the second spacer portion 22 is provided, and the first spacer portion 21 forms one passage in the image display area D. Are formed. With the configuration of the first spacer portion 21 and the second spacer portion 22 shown in FIG. 11, the liquid silicone resin for forming the transparent adhesive layer 30 is filled from one opening 23, and the liquid silicone resin is used for the passage. It is possible to realize a manufacturing method in which the liquid silicone resin is discharged from the other opening portion 23 while being spread over the whole, and the filling speed of the liquid silicone resin can be improved. The number of openings 23 is not limited to the number shown in FIGS. 10 and 11.

As shown in FIGS. 10 and 11, the pattern shape of the first spacer portion 21 may be an arbitrary shape, and can be appropriately selected according to the screen size and application of the image display device. Further, when the difference in the refractive index between the first spacer portion 21 and the transparent adhesive layer 30 is relatively large, the visibility may be deteriorated. However, by appropriately selecting the pattern shape of the first spacer portion 21, the visibility can be improved. Can be improved.

Embodiment 3.
The configuration of the image display device according to the third embodiment of the present invention will be described. It should be noted that description of configurations that are the same as or corresponding to those of the first and second embodiments will be omitted, and only different portions will be described.

FIG. 12 is a plan sectional view showing the image display device 300 according to the third embodiment. In FIG. 12, the same reference numerals as those in FIG. 1 of the first embodiment indicate the same or corresponding configurations. As shown in FIG. 12, the transparent protective plate 20 of the image display device 300 according to the third embodiment includes a backside first layer 24 in which a first spacer portion 21 and a second spacer portion 22 are integrally formed, It has a two-layer structure including the second layer 25 on the front side, and the first layer 24 and the second layer 25 are made of different materials. The first layer 24 and the second layer 25 are preferably made of a material having high transparency. For example, the first layer 24 required to have adhesiveness with the transparent adhesive layer 30 is acrylic, and the second layer required to have impact resistance. It is preferable to use polycarbonate or the like for 25.

The two-layer structure transparent protective plate 20 in which the first spacer portion 21 and the second spacer portion 22 are integrally formed is manufactured by injection molding. Specifically, the transparent protective plate 20 having a two-layer structure is manufactured by die slide injection molding or film insert molding.

In the image display device 300 according to the third embodiment, the transparent protective plate is the first layer integrally formed with the first spacer portion and the front surface side which is the surface on which the first spacer portion of the first layer is not formed. It has a two-layer structure including a second layer provided in the.

Further, the image display device 300 according to the third embodiment is characterized in that the first protective layer of the transparent protective plate has a smaller refractive index than the second layer.

With the above configuration, the image display device 300 according to the third embodiment uses the transparent protective plate 20 having the two-layer structure, so that a highly efficient image display device with high production efficiency can be obtained.

In the present invention, the respective embodiments can be freely combined, or the respective embodiments can be appropriately modified or omitted within the scope of the invention.

100, 101, 102, 103, 104, 200, 201, 202, 300 Image display device 10 Image display panel 20 Transparent protective plate 21 First spacer section 22 Second spacer section 23 Opening section 24 First layer 25 Second layer 30 Transparent adhesive layer

Claims (12)

An image display panel having an image display area which is an area where an image is displayed,
A transparent protective plate provided on the image display area,
A first spacer portion integrally formed with the transparent protection plate in the image display area of the surface of the transparent protection plate facing the image display panel;
A transparent adhesive layer provided between the image display panel and the transparent protective plate,
An image display device including. The image display device according to claim 1, further comprising: a second spacer portion integrally formed with the transparent protection plate along an outer periphery of the image display area, between the image display panel and the transparent protection plate. .. The image display device according to claim 2, wherein an opening is provided in a part of the second spacer portion along the outer periphery of the image display area. The image display device according to claim 3, wherein a plurality of the openings are provided. The image display device according to any one of claims 1 to 4, wherein the transparent protective plate and the first spacer portion are made of the same material. The image display device according to claim 1, wherein a difference in refractive index between the transparent protective plate and the transparent adhesive layer is 0.01 or less. The Young's modulus of the transparent adhesive layer is 10 ³ Pa or more and 10 ⁶ Pa or less, and the image display device according to any one of claims 1 to 6. The transparent protective plate includes a first layer integrally formed with the first spacer portion, and a second layer provided on a front surface side of the first layer on which the first spacer portion is not formed. 8. The image display device according to claim 1, wherein the image display device has a two-layer structure. The image display device according to claim 8, wherein the refractive index of the first layer is smaller than the refractive index of the second layer. Arranging a liquid synthetic resin on the surface of the transparent protective plate integrally formed with the first spacer portion on which the first spacer portion is formed,
A step of arranging the transparent protective plate and an image display panel having an image display area that is an area where an image is displayed so as to face each other so as to sandwich the first spacer portion;
Curing the liquid synthetic resin to form a transparent adhesive layer,
And a method for manufacturing an image display device. A step of disposing a liquid synthetic resin on the second spacer portion of a transparent protective plate integrally formed with a first spacer portion and a second spacer portion partially provided with an opening;
A step of arranging the transparent protective plate and an image display panel having an image display area, which is an area where an image is displayed, so as to sandwich the first spacer portion,
Curing the liquid synthetic resin disposed on the second spacer portion to form a transparent adhesive layer,
Filling the space between the transparent protective plate and the image display panel with liquid synthetic resin from the opening,
A step of curing a liquid synthetic resin filled in a space between the transparent protective plate and the image display panel to form a transparent adhesive layer,
And a method for manufacturing an image display device. The second spacer portion is formed along the outer periphery of the image display area,
The method for manufacturing an image display device according to claim 11, wherein a space between the transparent protective plate and the image display panel is filled with a liquid synthetic resin with the opening facing upward.

Images