TWI396007B - Image display panel and manufacturing method thereof - Google Patents

Description

Image display panel and manufacturing method thereof

The present invention relates to an image display panel constructed by attaching a panel substrate of a mobile phone, a digital camera, a television, a computer, and other electronic devices, and a method of manufacturing the same.

When a panel substrate of an image display panel such as an electronic device is attached, and an optical double-sided tape is attached thereto, an air layer is generated inside the step caused by the decoration. That is, as shown in FIG. 6(a), the back surface 21a of the see-through panel substrate 21 on which the image display is formed is decorated to form a layer (hereinafter referred to as "decorative layer") 22 constituting the decoration. When the optical double-sided tape 23 is attached to the upper surface 22a and the back surface 21a of the panel substrate 21, as shown in FIG. 6(b), the corner portion of the step difference 24 between the panel substrate 21 and the decorative layer 22 may be condensed like air. Air layer 25.

Here, in order to eliminate the air layer 25 which is generated in the step difference 24 between the panel substrate 21 and the decorative layer 22 as described above, in the following step, the air of the air layer 22 may be removed by using a pressurized defoaming device. After the work, but after the pressure defoaming, the air layer 25 is again generated due to the recovery of the optical double-sided tape 23 over time. Further, there is a problem that it is difficult to attach the optical double-sided tape 23 smoothly.

Further, as shown in FIG. 6(a), when the decorative layer 22 is formed by, for example, a two-layer ink layer 22c, 22d, a step difference 22b is provided in the decorative layer 22, the width of the step 24 is wide. Become bigger. In this case, when the optical double-sided tape 23 is attached to the back surface of the panel substrate 21 and the decorative layer 22, as shown in FIG. 6(b), the optical double-sided tape 23 does not become smooth and may be in the step 24 A deformation such as the crease 29 is generated in the vicinity. Then, when the other member 27 is attached to the back surface of the optical double-sided tape 23, the member 27 is adhered in a state of being deformed by forced stretching of the panel substrate 21 toward the member 27 side by a PET resin or the like. The inside of the panel substrate 21 is deformed into a curved shape 31 toward the back side. Further, at this time, as shown in FIG. 7, when the image display panel 20 is viewed from the front, the crease 29 of the optical double-sided tape 23 generated along the inner side of the aforementioned step 24 may be along the edge of the decorative layer 22. The problem of seeing ribs near the inside is seen.

Further, when the evacuation holes 26 and the like are formed in the decorative layer 22 as shown in FIG. 6(a), the optical double-sided tape 23 is bonded to the back surface of the panel substrate 21 and the decorative layer 22 as shown in FIG. 6(b). When the other member 27 is attached to the back surface of the optical double-sided tape 23 as shown in FIG. 6(c), the panel substrate 21 is attached to the member 27 side as shown in FIG. 6(d). Therefore, the panel substrate 21 at the position of the air vent 26 is twisted into a concave shape toward the back side.

Further, as shown in Fig. 7, when the decorative portion 28 such as a trademark mark is applied to the back surface of the panel substrate 21, the cross-sectional shape thereof is as shown in Fig. 8(a). In the figure, the optical double-sided tape 23 is attached to the back surface of the panel substrate 21 and the decorative portion 28, and the optical double-sided tape 23 is formed in a wave shape along the thickness direction of the decorative portion 28. Next, as shown in FIGS. 8(b) and 8(c), when another rigid member 27 such as a glass plate is bonded to the back surface of the optical double-sided tape 23, the optical double-sided tape between the decorative portions 28 and 28 is provided. The panel substrate 21 which is stretched and deformed toward the member 27 side, and the panel substrate 21 made of a PET resin or the like has a convex deformation 21b which is convex toward the front side in each of the decorative portions 28. Further, as shown in FIG. 7, the convex deformation 21b is, for example, a wheel-shaped twist 30 in each of the decorative portions 28, and is rough and deformed.

However, in the following Patent Document 1, an image display device manufactured by a conventional image display device that does not cause bubbles to be formed between the transparent resin and the image display portion side panel is disclosed, and a method of manufacturing the same.

However, the image display device and the method of manufacturing the same are those in which a notch is provided between spacers provided around the transparent panel. In addition, the hardened resin filled on the upper surface of the transparent plate and filled on the inner side of the spacer is smoothed by the pressing of the image display unit side panel, and the remaining hardened resin is discharged from the notch.

In the image display device of Patent Document 1, and the method of manufacturing the same, the cured resin is not applied to the spacers, and the remaining hardened resin is discharged from the gap between the spacer and the spacer, so that the resin cannot be continuously formed. The spacer provided in the peripheral portion of the transparent panel has a shape in which each of the cutout portions is interrupted.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2008-209510

According to the present invention, in addition to Patent Document 1, a continuous decorative layer can be applied to the back surface of the panel substrate, and when the optical double-sided tape is attached to the upper surface of the decorative layer, the step of the decorative layer can be eliminated. In the case of the air layer, the panel substrate can be kept smooth without deformation.

In other words, it is an object of the present invention to provide a decorative layer for a panel substrate provided in an image display unit of an electronic device or the like, and when an optical double-sided tape is attached to the decorative layer, bubbles or air layers can be formed. In the method, the back surface of the panel substrate is smooth, and the image substrate is formed in a smooth shape by applying the optical double-sided tape to the panel substrate without strain.

In order to solve the above problems, the image display panel of the first aspect of the present invention is an image display panel to which a decorative layer is applied on the back side of a see-through panel substrate for performing image display, and is characterized in that: The inner side of the step of the decorative layer on the back surface and the upper surface of the decorative layer are continuously filled with an ultraviolet curable resin or a thermosetting resin, and the back surface of the ultraviolet curable resin or the thermosetting resin is cured to be smooth.

Further, the image display panel of the second application of the present invention is in the first aspect of the patent application, characterized in that a smooth back-side adhesive optical double-sided tape is applied to the back surface of the panel substrate with an ultraviolet curing resin or a thermosetting resin. .

Further, a method of manufacturing an image display panel according to the third aspect of the present invention is a method of manufacturing an image display panel having a decorative layer on a back surface of a see-through panel substrate for performing image display, characterized in that: The inside of the step of the decorative layer on the back surface of the panel substrate and the upper surface of the decorative layer are continuously filled with an ultraviolet curable resin or a thermosetting resin, and then the separator is coated on the upper surface of the hardened resin. After the separator is pressed against the hardened resin side and irradiated with ultraviolet rays, the separator film is peeled off.

Further, the method of manufacturing the image display panel of claim 4 of the present invention is as in the third aspect of the patent application, characterized in that the inside of the step of the decorative layer on the back side of the panel substrate and the upper surface of the decorative layer are provided. When the ultraviolet curable resin or the thermosetting resin is continuously filled, the hardening resin is filled by solid printing.

Further, the method of manufacturing the image display panel of claim 5 of the present invention is the third or fourth aspect of the patent application, characterized in that the inside of the step of the decorative layer on the back side of the panel substrate and the decorative layer are provided. The upper surface is continuously filled with an ultraviolet curable resin or a thermosetting resin, and after pressing the hardened resin and hardening, the outer shape of the hardened resin is cut into a specific shape.

According to the above configuration, according to the method for manufacturing an image display panel of the present invention, a continuous decorative layer can be applied to the back surface of the sleek panel substrate, and the inside of the step of the decorative layer on the back side of the panel substrate can be The surface of the decorative layer is continuously filled with an ultraviolet curable resin or a thermosetting resin, and the back surface of the cured resin is hardened into a smooth image display panel.

According to such an image display panel, it is possible to form a step which eliminates a decorative layer provided on the back surface of the panel substrate, and an air layer such as a bubble does not occur inside the step caused by the decorative layer, and is hardened. An image display panel in which bubbles do not occur even when the optical double-sided tape is bonded to the smooth back surface of the ultraviolet curable resin or the thermosetting resin.

Further, when the optical double-sided tape is bonded to the smooth back surface of the cured ultraviolet curable resin or the thermosetting resin, the optical double-sided tape is also attached smoothly. In other words, when the other side of the optical double-sided tape is attached to a glass plate or other members, the panel substrate is not deformed, and the panel substrate can be maintained in a smooth and beautiful appearance, and a very beautiful appearance image can be obtained. Display panel.

Further, according to the present invention, the penetration hole to which the decorative layer is applied is also filled with the ultraviolet curable resin or the thermosetting resin having a uniform back surface, so that the panel substrate can be deformed without unevenness. Beautiful new style image display panel.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[Examples]

According to an embodiment of the present invention, as shown in FIGS. 1 to 5, an image display panel 1 in which a decorative layer 3 is applied to a back surface of a pivotable panel substrate 2 for image display is provided, and the back surface of the panel substrate 2 is attached. The inner side of the step 3b (see FIG. 4(a)) and the upper surface 3a of the decorative layer 3 are continuously filled with an ultraviolet curable resin or a thermosetting resin (hereinafter referred to as "hardened resin") 4 at the same time. The back surface of the hardened resin 4 is hardened to be smooth.

As shown in Fig. 1, the embodiment of the image display panel 1 having the above configuration is used as a display panel of a mobile phone. However, the invention shown in FIG. 1 is merely an embodiment of the present invention, and the present invention can also be configured as an image display panel 1 for an electronic device such as a mobile phone, a digital camera, a television, or a computer.

1 is only an embodiment of a single image display panel 1 according to the present invention, but the overall shape or the shape of the decorative layer 3 and the like are determined in accordance with an applicable electronic device. In addition, as shown in FIG. 2, the image display panel 1 of FIG. 1 is formed in a plurality of sheets on one thin plate, and an example of a large-sized plate 5 formed by forming a plurality of faces of the image display panel 1 is used.

Further, even if the image display panel 1 is applied to any electronic device, as shown in FIG. 3(a) or FIG. 4(a), on the back surface of the panel substrate 2 composed of a transparent PET film or the like, by the screen The decorative layer 3 is applied by silk printing or the like.

In such a configuration, as the material of the panel substrate 2, as described above, a polycarbonate film, acrylic, glass, or a laminated film of these members can be used. Further, the decorative layer 3 provided on the panel substrate 2 may be provided with a base color or a trademark or a mark on the panel substrate 2 in addition to the decoration provided on the peripheral portion of the panel substrate.

Further, as shown in FIG. 4(a), the decorative layer 3 may have a configuration in which two ink layers 3d and 3e are stacked, for example. In this case, the step 3c is provided by the inner peripheral shape formed by pulling the layer 3d on the back side of the decorative layer 3 to the outer side, and the inner end of the layer 3d on the back side of the decorative layer 3 is not The panel substrate 2 is presented in the forward direction or in the front side of the panel substrate 2.

Further, in the present embodiment, as shown in FIG. 4(b), the hardened resin 4 is filled on the inner side of the step 3b of the decorative layer 3 on the back surface of the panel substrate 2 and the upper surface 3a of the decorative layer 3. At this time, the step 3c of the above-described decorative layer 3 is filled with the hardened resin 4 without generating bubbles or the like. The details of the filling method of the hardening resin 4 will be described in detail later, but are filled by full-solid printing using screen printing (refer to FIG. 4(b)). Further, as another embodiment, a dispenser may be used to control the amount of liquid to be filled (see FIG. 5(b)).

The back surface 4a of the hardened resin 4 after the filling is covered with a separator film 6 such as a PET film of a release agent 7 such as fluorine or ruthenium, and is irradiated with UV in a pressurized state. ) and harden its UV. In addition, when the cured resin 4 is covered with the separator film 6 such as a PET film, it can be irradiated under favorable irradiation conditions without being hindered by oxygen in the air during UV irradiation, whereby the back surface of the panel substrate 2 can be reinforced. 2a or the bonding force of the hardened resin 4 of the decorative layer 3.

Further, as shown in FIG. 3(d) or FIG. 4(e), by peeling off the separator film 6, the image display panel 1 in which the back surface 4a of the cured resin 4 constitutes a smooth surface is formed. Further, the release agent 7 is provided between the back surface of the cured resin 4 and the separator film 6 in order to easily peel off the separator film 6 after the cured resin 4 is cured. Further, by peeling off the separator film 6, a thinner image display panel 1 can be obtained.

Further, as shown in FIG. 4(f), when the optical double-sided tape 8 is attached to the smooth back surface 4a of the cured resin 4 applied to the back surface 2a of the panel substrate 2, the optical double-sided tape 8 can be used. The adhesive strength of the back surface 8a adheres to the mounting space or other parts of the image display panel 1. Further, when the optical double-sided tape 8 is bonded to the smooth back surface of the hardened resin 4 as described above, the optical double-sided tape 8 is also attached to the smooth shape, so that the other side of the optical double-sided tape 8 is attached to When the glass plate or other members are not deformed on the panel substrate 2, the panel substrate 2 can be maintained in a beautiful smooth shape.

Hereinafter, an embodiment of a method of manufacturing an image display panel according to the present invention will be described. This embodiment relates to a method of filling the hardened resin 4 with a solid solid printing when the step 3b caused by the addition of the hardening resin 4 to the decorative layer 3 applied to the panel substrate 2. The drawings of this embodiment correspond to Figs. 3(a) to (e) and Figs. 4(a) to (f). 3(a) to (e), a plan view of a large-sized board 5 of a plurality of image display panels 1 can be manufactured by using one thin plate, and FIGS. 4(a) to (f) show cross sections of individual image display panels 1. .

First, as shown in FIG. 3(a) or FIG. 4(a), the decorative layer 3 is applied to the back surface 2a of the sleek panel substrate 2 on which the image display is performed. In this step, as the panel substrate 2, in addition to the transparent PET film, polycarbonate, acrylic, glass, or a laminated film of these members can be applied.

Further, the decorative layer 3 applied to the back surface 2a of the panel substrate 2 is formed by screen printing in response to a specific decorative shape of the electronic device. However, as another forming method of the decorative layer 3, a specific decorative layer may be formed by applying a gravure printing foil. By providing such a decorative layer 3, a step 3b caused by the decorative layer 3 is generated on the back surface of the panel substrate 2.

Further, in the decorative layer 3 on the right side shown in Fig. 4 (a), a cross section of a portion where the penetration hole 9 is formed is displayed. The penetration hole 9 is provided for transmitting light of a flash, an illuminance sensor, or the like of the electronic device when the image display panel 1 according to the present embodiment is mounted, or for ensuring a field of view of the glass lens, as shown in the figure. The plane of 2 is formed in accordance with the configuration of the electronic apparatus on which the image display panel 1 of the present embodiment is mounted.

Next, as shown in FIG. 4(b), the above-mentioned hardened resin 4 is continuously filled by the inside of the step 3b of the decorative layer 3 applied to the back surface 2a of the panel substrate 2 and the upper surface 3a of the decorative layer 3, The hardening resin 4 can be filled in the step 3c of the decorative layer 3 without generating bubbles or the like. Further, the penetration hole 9 of the decorative layer 3 is also filled in a state in which the cured resin 4 has the uniform back surface 4a.

Further, in the present embodiment, as the method of filling the cured resin 4, the hardened resin 4 such as an ultraviolet curable resin or a thermosetting resin is printed by a solid solid according to screen printing or the like. And the method of filling. In such a filling method, the viscosity of the cured resin 4 must be such that no air bubbles or air layers are generated on the inner side or the corner portion of the step 3b caused by the decorative layer 3, and the step 3b can be sufficiently wound. Or penetrating the corners of the inner portion of the hole 9.

Moreover, the method of filling the cured resin 4 shown in FIG. 4(b) corresponds to the method of FIG. 3(b), and is preferably filled by the method of filling the cured resin 4 by integral solid printing such as screen printing. When a plurality of image display panels 1 are formed on one thin plate-shaped panel substrate 2 to form a large-sized board 5, the image display panel 1 is suitable for mass production.

Further, the ultraviolet curable resin used as the curable resin 4 is not particularly limited in the present invention, and an amino acrylate-based ultraviolet curable resin is preferable in terms of general availability and price. Examples of the amino acrylate-based ultraviolet curable resin include polyester urethane (meth) acrylate, polyether (meth) acrylate, and urethane (meth) acrylate carbonate.

In addition, the thermosetting resin used as the curing resin 4 is not particularly limited, and a lanthanum thermosetting resin, a urethane thermosetting resin, a polyester thermosetting resin, a polyimine or the like is suitably used.

Next, as shown in FIG. 4(c), the separator film 6 is applied to the hardened resin 4 side in a state in which the separator 6 of the release agent 7 according to fluorine or ruthenium is coated on the upper surface of the above-mentioned cured resin 4. At the same time, UV irradiation is performed by the UV irradiation device 10.

When such a pressurization and UV irradiation are applied to the production of the large-sized sheet 5, as shown in FIG. 3(c), the release agent 7 is placed on the upper surface of the cured resin 4 to cover the separator 6. .

As a specific method, as shown in FIG. 3(e), the state in which the hardened resin 4 is filled on the inner side and the upper surface of the step 3b of the decorative layer 3 applied to the panel substrate 2 passes between the upper and lower rolls 11a and 11b. At the same time, the separator film 6 is wound on the back side of the cured resin 4, and the back surface of the cured resin 4 is pressed by the separator 6. At the same time, by irradiating the UV light from the UV irradiation device 10 provided near the exit of the upper and lower rolls 11a, 11b, the hardened resin 4 after pressing can be UV-cured. By such a procedure, the back surface 4a of the cured resin 4 which is buried in the step 3b of the decorative layer 3 provided on the back surface of the panel substrate 2 is hardened in a uniform and smooth state.

Moreover, in such a step, as shown in FIG. 4(d), the pressed cured resin 4 is stretched in the planar direction and is oozing out from the outer shape of the panel substrate 2 and the decorative layer 3 to form the remaining portion 4c.

Next, as shown in FIG. 3(d) or FIG. 4(e), the separator film 6 is peeled off. At this time, since the release film 7 is interposed between the separator film 6 as described above, it can be easily peeled off from the cured hardened resin 4.

Further, as shown in FIG. 4(e), the remaining portion 4c of the outer shape of the cured resin 4 is cut into a specific shape, and the outer shape of the panel substrate 2 and the decorative layer 3 has the same outer shape.

Further, as shown in FIG. 4(f), when the product is attached to the smooth surface of the back surface 4a of the cured resin 4 applied to the back surface of the panel substrate 2, the optical double-sided tape 9 can be attached. The bonding surface of the back surface of the optical double-sided tape 9 is adhered to the mounting place or other parts of the image display panel 1.

As another embodiment of the foregoing embodiment, the image processing apparatus of the present invention can also be manufactured by the steps shown in Figs. 5(a) to (f). However, this step differs from the above-described FIGS. 4(a) to 4(f) only in the steps shown in FIG. 5(b), and the contents of the other steps are the same.

That is, the step shown in FIG. 5(b) is a method in which the hardened resin 4 is suspended from above and can be filled on the inner side of the step 3b of the decorative layer 3 of the panel substrate 2 and the decorative layer 3 The upper 3a is continuously filled with the hardening resin 4.

Further, in the case of mass production of the image display panel 1 of the present embodiment, the amount of the hardened resin 4 to be filled can be controlled by using a dispenser (not shown), thereby saving the hardened resin from waste.

In addition, in FIG. 5(c), as a method of pressing the cured resin 4 with the separator 6 interposed therebetween, it is also possible to use a widely known laminator in addition to the above-described rolls. In this step, as described above, the pressed hardened resin 4 is extended in the planar direction and is oozing out from the outer shape of the outer surface of the panel substrate 2 and the decorative layer 3 to form the remaining portion 4c. Next, in the step shown in Fig. 5(e), a product having a specific shape can be obtained by cutting the remaining portion 4c of the outer shape.

[Industry use possibility]

The image display panel of the present invention and the method of manufacturing the same can be used as a decorative layer that can be applied to a panel substrate provided in an image display unit of an electronic device or the like, and when an optical double-sided tape is attached to the decorative layer, In the method of generating a bubble or an air layer, the back surface of the panel substrate is smooth, and the image display panel and the method of manufacturing the same are formed by attaching the optical double-sided tape to the panel substrate without strain.

1. . . Image display panel

2. . . Panel substrate

2a. . . Back side of panel substrate

3. . . Decorative layer

3a. . . Above the decorative layer

3b. . . Step difference

4. . . Hardened resin

4a. . . Hardened resin back

4b. . . Step difference

4c. . . Remaining part

5. . . Large size board

6. . . Separator

7. . . Release agent

8. . . Optical double-sided tape

8a. . . Back of optical double-sided tape

9. . . Penetrating hole

10. . . UV irradiation device

11a, 11b. . . Roll

1 is a plan view of an individual image display panel in accordance with the present invention.

Fig. 2 is a partial plan view showing a large-sized board in which a plurality of image display panels are formed on one thin plate according to the image display panel of the present invention.

3(a) to 3(d) are plan views showing the steps of the image display panel according to the present invention, and (e) is a side view showing the pressing method corresponding to Fig. 3(c).

4(a) to (f) are cross-sectional views showing the steps of the image display panel according to the present invention.

5(a) to (f) are cross-sectional views showing other steps of the image display panel according to the present invention.

6(a) to 6(d) are cross-sectional views showing the steps of the former image display panel.

Figure 7 is a plan view of a prior image display panel.

8(a) to 8(c) are cross-sectional views showing the steps of forming a decorative portion such as a trademark on the image display panel of the prior art.

1. . . Image display panel

2. . . Panel substrate

3. . . Decorative layer

5. . . Large size board

2a. . . Back side of panel substrate

4. . . Hardened resin

4a. . . Hardened resin back

6. . . Separator

10. . . UV irradiation device

11a, 11b. . . Roll

Claims (5)

An image display panel is an image display panel with a decorative layer applied to the back side of a see-through panel substrate for performing image display, and is characterized in that: the inner side of the step of the decorative layer on the back side of the panel substrate and the decorative layer The upper surface is continuously filled with an ultraviolet curing resin or a thermosetting resin; the decorative layer is formed on the back surface of the panel substrate to form a single layer or a plurality of layers of the ink layer; and the filling layer is continuously filled in the through hole formed in the decorative layer and the decorative layer The inside of the step and the back surface of the ultraviolet curable resin or the thermosetting resin on the upper side of the decorative layer are smoothed by ultraviolet irradiation or heat curing by ultraviolet irradiation or heating. . The image display panel of claim 1, wherein the back surface of the panel substrate is provided with a smooth backside-adhesive optical double-sided tape of an ultraviolet curing resin or a thermosetting resin. A method for manufacturing an image display panel, which is a method for manufacturing an image display panel with a decorative layer on the back side of a see-through panel substrate for performing image display, characterized in that: a step of a decorative layer on the back side of the panel substrate The inner side and the decorative layer are continuously filled with an ultraviolet curable resin or a thermosetting resin, and then the partition film is pressed to the hardened resin side while being subjected to ultraviolet irradiation in a state in which the release film of the release agent is coated on the upper surface of the cured resin. Or after applying heat, the separator film is peeled off. For example, the manufacturer of the image display panel of claim 3 The method of filling the hardened resin by solid printing when the inside of the step of the decorative layer on the back side of the panel substrate and the upper surface of the decorative layer are continuously filled with the ultraviolet curable resin or the thermosetting resin . The method for manufacturing an image display panel according to claim 3, wherein the inner side of the decorative layer on the back side of the panel substrate and the upper side of the decorative layer are continuously filled with an ultraviolet curing resin or a thermosetting resin. After the hardening resin is pressed and hardened, the outer shape of the hardened resin is cut into a specific shape.