JP2012230304A - Method for manufacturing protective sheet for liquid crystal display, protective sheet for liquid crystal display, method for manufacturing liquid crystal display device and liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a protective sheet for liquid crystal display capable of surely securing thickness accuracy.SOLUTION: A printing layer 2 is formed on a part of a transparent protective film 1 to protect a liquid crystal display surface, a curable resin 3, which become at least transparent after curing, is mounted on the printing layer forming surface of the transparent protective film 1, further the front and back surfaces of a resin film 4 are controlled to uniformize the thickness in a state where the resin film 4 is laminated, and the curable resin 3 is cured in the state, thereby surely securing the product accuracy when the resin film is adhered to a liquid crystal display device 6.

Description

  The present invention relates to a manufacturing method of a protective sheet for liquid crystal display for protecting the surface of a liquid crystal display device used for, for example, a smartphone or a mobile phone, a protective sheet for liquid crystal display, a manufacturing method of a liquid crystal display device, and a liquid crystal display device It is.

  For example, in a liquid crystal display device used for a smartphone, a mobile phone, or the like, a protective sheet is attached to the display surface for the purpose of protecting the image display surface from scratches. In such a protective sheet, an opaque printed layer is formed around a transparent protective sheet made of glass or plastic for reasons such as enhancing design properties. Then, when the protective sheet is attached to the liquid crystal display surface, the printed layer becomes like a spacer, and a gap is formed with respect to the liquid crystal display surface by the thickness.

  However, in the structure in which such a gap exists, there is a problem in that light is scattered due to the gap and the contrast and luminance are lowered to deteriorate the image quality of the liquid crystal display. Further, since the refractive indexes of the protective sheet and air are different, reflection occurs at these interfaces, and the visibility in particular outdoors is difficult. Further, the gap is difficult in terms of impact resistance.

  As the structure of the liquid crystal display device and the protective sheet, a spacer and an elastic filling layer are disposed between the liquid crystal display surface and the protective sheet (for example, Patent Document 1 below), and between the liquid crystal display surface and the protective sheet. Techniques such as those filled with a resin composition (for example, Patent Document 2 below) are disclosed.

JP 2009-86188 A JP 2009-186960 A JP-A-5-337418

  In Patent Document 1, a spacer (27) and an elastic filling layer (29) are provided in the gap between the liquid crystal display element (10) and the observation surface protection plate (25). Reference numerals in parentheses are those described in the publication.

  When the technique of Patent Document 1 is applied to a protective sheet on which a printing layer is formed, a filling layer (29) having the same thickness as the printing layer is prepared, and a space between the printing layers is provided in an area surrounded by the printing layers. It must be positioned so that there is no gap between them. If the thickness accuracy of the filling layer (29) is poor, the gap between the protective sheet and the liquid crystal display surface is not sufficiently filled, or the printed layer and the liquid crystal display surface are not in close contact with each other and a gap is formed there. When the shape accuracy of the filling layer (29) is poor, a gap is formed between the filling layer and the printing layer, or the printing layer and the liquid crystal display surface are not in close contact with each other and a gap is formed there.

  In Patent Document 2, a translucent protective panel (3) having a light-shielding portion (5) and a liquid crystal display unit (2) are arranged to face each other, and a resin composition (10) is filled in the gap between these panels. A cured resin layer (11) is obtained by curing the resin composition (10). Reference numerals in parentheses are those described in the publication.

  In Patent Document 2, the resin composition (10) is directly dropped onto the liquid crystal display unit (2), and the protective panel (3) is bonded and cured. Then, the thickness of the cured resin layer (11) formed in the gap between the liquid crystal display unit (2) and the protective panel (3) is controlled by the dropping amount of the resin composition (10) (paragraph 0019). In such an operation, the resin composition (10) is not sufficiently filled over the entire gap, or easily protrudes from the gap, and there is a problem in the final thickness accuracy of the cured resin layer (11). Variations in the thickness accuracy of the cured resin layer (11) directly become variations in product accuracy.

  The present invention has been made to solve the above-described problems, and a method for manufacturing a protective sheet for liquid crystal display, a protective sheet for liquid crystal display, and a liquid crystal display device capable of reliably ensuring thickness accuracy. It is an object to provide a method and a liquid crystal display device.

In order to achieve the above object, the method for producing a protective sheet for a liquid crystal display according to the present invention forms a printing layer on a part of a transparent protective film for protecting the liquid crystal display surface,
On the printed layer forming surface of the transparent protective film, put at least a curable resin that becomes transparent after curing,
Furthermore, with the resin film laminated, the front and back surfaces are regulated to make the thickness uniform.
The gist is to cure the curable resin in that state.

In order to achieve the above object, the protective sheet for liquid crystal display of the present invention has a printing layer formed on a part of a transparent protective film for protecting the liquid crystal display surface,
The gist is that a curable resin layer made of a curable resin that becomes transparent after curing is formed on the printed layer forming surface of the transparent protective film, and the thickness is uniform in a state where the resin films are laminated.

In order to achieve the above object, the method for producing a liquid crystal display device of the present invention forms a printing layer on a part of a transparent protective film for protecting the liquid crystal display surface,
On the printed layer forming surface of the transparent protective film, put at least a curable resin that becomes transparent after curing,
Furthermore, with the resin film laminated, the front and back surfaces are regulated to make the thickness uniform.
In that state, the curable resin is cured to form a protective sheet for liquid crystal display,
The gist is to remove the resin film of the protective sheet for liquid crystal display, expose the curable resin, and stick it to the display surface of the liquid crystal display device via an adhesive or adhesive.

In order to achieve the above object, the liquid crystal display device of the present invention has a printing layer formed on a part of a transparent protective film for protecting the liquid crystal display surface,
On the printed layer forming surface of the transparent protective film, a curable resin layer formed of a curable resin that becomes transparent after curing is formed, the thickness becomes uniform, and a protective sheet for liquid crystal display is formed,
The gist of the protective sheet for liquid crystal display is that the curable resin layer is attached to the display surface of the liquid crystal display device via an adhesive or an adhesive.

In the method for producing a protective sheet for liquid crystal display of the present invention, the front and back sides are regulated in a state where resin films are laminated to make the thickness uniform, and the curable resin is cured in that state.
For this reason, the thickness accuracy of the protective sheet for liquid crystal display can be ensured reliably.

The protective sheet for liquid crystal display of the present invention has a uniform thickness in a state where resin films are laminated.
For this reason, it is possible to ensure the product accuracy when it is attached to the liquid crystal display device.

In the method for producing a liquid crystal display device of the present invention, the front and back surfaces are regulated in a state where resin films are laminated to make the thickness uniform, and the curable resin is cured in that state to form a protective sheet for liquid crystal display, and the liquid crystal The resin film of the display protective sheet is removed to expose the curable resin, which is adhered to the display surface of the liquid crystal display device via an adhesive or an adhesive.
For this reason, the thickness accuracy of the protective sheet for liquid crystal display can be reliably ensured, and the product accuracy when the protective sheet for liquid crystal display is attached to the liquid crystal display device can be reliably ensured.

In the liquid crystal display device of the present invention, a curable resin layer made of a curable resin that becomes transparent after curing is formed on the printed layer forming surface of the transparent protective film, thereby forming a uniform thickness and forming a protective sheet for liquid crystal display In the protective sheet for liquid crystal display, the curable resin layer is attached to the display surface of the liquid crystal display device via an adhesive or an adhesive.
For this reason, the product accuracy when the protective sheet for liquid crystal display is attached to the liquid crystal display device can be reliably ensured.

It is a figure explaining the manufacturing method of the protective sheet for liquid crystal displays of embodiment of this invention. It is a figure explaining the manufacturing method of the liquid crystal display device of embodiment of this invention.

  Next, an embodiment for carrying out the present invention will be described.

  FIG. 1 is a schematic diagram illustrating a method for manufacturing a protective sheet for liquid crystal display according to the first embodiment of the present invention.

  In this method, a printed layer 2 is formed on a part of a transparent protective film 1 for protecting a liquid crystal display surface, and a curable resin 3 that is transparent at least after being cured is placed on the printed layer forming surface of the transparent protective film 1. Further, the front and back sides are regulated to make the thickness uniform in a state where the resin film 4 is laminated, and the curable resin 3 is cured in that state.

  This will be described in detail below.

  FIG. 1A is a cross-sectional view of a state in which a transparent protective film 1 is prepared. As this transparent protective film 1, the thing made from resin or glass can be used. The resin film can be set to a thickness of about 0.125 to 0.25 mm, and the glass film can be set to a thickness of about 0.4 to 0.9 mm. As the material of the resin film, for example, a film subjected to a hard coat treatment having a good light transmittance such as an acrylic resin, a PET resin, or a polycarbonate resin can be used.

  FIG. 1B is a cross-sectional view showing a state in which the printing layer 2 is formed on a part of the transparent protective film 1. The printing layer 2 can be formed as a concealing layer that does not transmit light. In this example, the print layer 2 is formed so as to surround the periphery of the liquid crystal display surface to be protected. The print layer 2 can be formed by screen-printing a light-shielding paint.

  FIG. 1C is a cross-sectional view showing a state where a curable resin 3 that is transparent at least after being cured is placed on the printed layer forming surface of the transparent protective film 1. As said curable resin 3, an ultraviolet curable resin, a thermosetting resin, an epoxy resin etc. can be used, for example. Among these, an ultraviolet curable resin that does not involve heating or kneading is easy to handle and can be suitably used. As a method of placing the curable resin 3 on the printed layer forming surface of the transparent protective film 1, a method of screen coating or stretching with a blade after dropping can be employed. The curable resin 3 is formed not only to cover the entire surface of the transparent protective film 1 on which the printing layer is formed, that is, the region where the printing layer 2 is not formed, but also to cover the printing layer 2.

  FIG. 1D is a cross-sectional view showing a state in which the front and back surfaces are regulated and the thickness is made uniform with the resin film 4 further laminated. As described above, the resin film 4 is further laminated on the surface of the transparent protective film 1 on which the curable resin 3 is placed in a layered state on the printed layer forming surface.

  The resin film 4 is a process of regulating the front and back to make the thickness uniform, and prevents the curable resin 3 before curing from adhering to the regulated member and is cured after the curable resin 3 is cured. The protective resin layer 3a is protected. As the material for the resin film 4, a material that is easily peeled off from the cured curable resin layer 3 a is preferable. For example, PET, polycarbonate resin, or the like can be used. An easily peelable surface such as a silicone film or a fluororesin film can be formed on the surface that is in close contact with the curable resin layer 3a. As the resin film 4, one having optical transparency can also be used.

  The regulation of the front and back surfaces can make the thickness uniform by, for example, passing between a pair of rolls maintained at a predetermined clearance in a state where the transparent protective film 1, the curable resin 3, and the resin film 4 are laminated. . Also, the thickness can be made uniform by pressing from above and below until a certain clearance is reached.

  FIG.1 (e) is sectional drawing which shows the state which hardened | cured the said curable resin 3 in the state. The curable resin 3 is cured by irradiation with ultraviolet rays if it is an ultraviolet curable resin, and is cured by heating if it is a thermosetting resin. If it is an epoxy resin, it can be hardened by leaving it for a predetermined time.

  In the protective sheet for liquid crystal display thus formed, the printing layer 2 is formed on a part of the transparent protective film 1 for protecting the liquid crystal display surface, and the transparent protective film 1 is transparent after curing on the printed layer forming surface. The curable resin layer 3a is formed from the curable resin, and the thickness is uniform in a state where the resin film 4 is further laminated.

As mentioned above, the manufacturing method of the protective sheet for liquid crystal display of this embodiment regulates the front and back in the state which laminated | stacked the resin film 4, makes thickness uniform, and hardens the said curable resin 3 in the state.
For this reason, the thickness accuracy of the protective sheet for liquid crystal display can be ensured reliably.

Further, the protective sheet for liquid crystal display of the present embodiment has a uniform thickness in a state where the resin film 4 is laminated.
For this reason, it is possible to ensure the product accuracy when it is attached to the liquid crystal display device.

  FIG. 2 is a diagram for explaining a method of manufacturing a liquid crystal display device using the above protective sheet for liquid crystal display.

  In this method, first, a protective sheet for liquid crystal display is formed as described in the above embodiment, the resin film 4 of the protective sheet for liquid crystal display is removed to expose the curable resin layer 3a, and the adhesive or It sticks with respect to the display surface of the liquid crystal display device 6 through an adhesive agent.

  This will be described in detail below.

  FIG. 2A shows a protective sheet for liquid crystal display made as described in the above embodiment. That is, the printing layer 2 is formed in a part of the transparent protective film 1 for protecting the liquid crystal display surface, and the curable resin layer 3a made of a curable resin that becomes transparent after curing on the printed layer forming surface of the transparent protective film 1. Is formed, and the thickness is uniform in a state where the resin film 4 is further laminated.

  FIG. 2B is a cross-sectional view showing a state in which the resin film 4 of the protective sheet for liquid crystal display is removed to expose the curable resin layer 3a, and the adhesive layer 5 is provided on the entire surface of the curable resin layer 3a. is there. For example, a double-sided tape or the like can be applied to the pressure-sensitive adhesive layer 5. Various adhesives can be used in place of the adhesive.

  FIG. 2 (c) shows a state in which the curable resin layer 3 a is formed on the printed layer forming surface of the transparent protective film 1 and is attached to the display surface of the liquid crystal display device 6 through the adhesive layer 5. FIG.

  In the liquid crystal display device thus formed, the printing layer 2 is formed on a part of the transparent protective film 1 for protecting the liquid crystal display surface, and becomes transparent after curing on the printing layer forming surface of the transparent protective film 1. A curable resin layer 3a made of a curable resin is formed to form a uniform thickness and a protective sheet for liquid crystal display is formed. The protective sheet for liquid crystal display is connected to the curable resin layer 3a via an adhesive layer 5. Is attached to the display surface of the liquid crystal display device 6.

As described above, the manufacturing method of the liquid crystal display device according to the present embodiment regulates the front and back surfaces in a state where the resin films 4 are laminated to make the thickness uniform, and in this state, the curable resin 3 is cured to be used for liquid crystal display. A protective sheet is formed, the resin film 4 of the protective sheet for liquid crystal display is removed to expose the curable resin layer 3a, and it is adhered to the display surface of the liquid crystal display device 6 through the adhesive layer 5. .
For this reason, the thickness accuracy of the protective sheet for liquid crystal display can be reliably ensured, and the product accuracy when the protective sheet for liquid crystal display is attached to the liquid crystal display device 6 can be reliably ensured.

Further, in the liquid crystal display device of the present embodiment, the curable resin layer 3a made of a curable resin that becomes transparent after curing is formed on the printed layer forming surface of the transparent protective film 1 so that the thickness becomes uniform. The protective sheet for liquid crystal is formed, and the protective sheet for liquid crystal display has the curable resin layer 3 a attached to the display surface of the liquid crystal display device 6 through the adhesive layer 5.
For this reason, the product accuracy when the protective sheet for liquid crystal display is stuck on the liquid crystal display device 6 can be reliably ensured.

1: Transparent protective film 2: Print layer 3: Curable resin 3a: Curable resin layer 4: Resin film 5: Adhesive layer 6: Liquid crystal display device

Claims (4)

Form a printing layer on a part of the transparent protective film to protect the liquid crystal display surface,
On the printed layer forming surface of the transparent protective film, put at least a curable resin that becomes transparent after curing,
Furthermore, with the resin film laminated, the front and back surfaces are regulated to make the thickness uniform.
The manufacturing method of the protective sheet for liquid crystal displays characterized by hardening the said curable resin in the state. A printing layer is formed on a part of the transparent protective film for protecting the liquid crystal display surface,
A liquid crystal characterized in that a curable resin layer made of a curable resin that becomes transparent after curing is formed on the printed layer forming surface of the transparent protective film, and the thickness is uniform in a state where the resin film is laminated. Protective sheet for display. Form a printing layer on a part of the transparent protective film to protect the liquid crystal display surface,
On the printed layer forming surface of the transparent protective film, put at least a curable resin that becomes transparent after curing,
Furthermore, with the resin film laminated, the front and back surfaces are regulated to make the thickness uniform.
In that state, the curable resin is cured to form a protective sheet for liquid crystal display,
A liquid crystal display device characterized in that the resin film of the protective sheet for liquid crystal display is removed to expose a curable resin, which is adhered to the display surface of the liquid crystal display device via an adhesive or an adhesive. Production method. A printing layer is formed on a part of the transparent protective film for protecting the liquid crystal display surface,
On the printed layer forming surface of the transparent protective film, a curable resin layer formed of a curable resin that becomes transparent after curing is formed, the thickness becomes uniform, and a protective sheet for liquid crystal display is formed,
The liquid crystal display device, wherein the protective sheet for liquid crystal display has the curable resin layer attached to a display surface of a liquid crystal display device via an adhesive or an adhesive.

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