JP2013218188A - Display panel protective film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display panel protective film for an electronic apparatus capable of providing a clean display screen without leaving air bubble.SOLUTION: A display panel protective film includes at least a film layer, an adhesive layer, and a surface coating layer, and has grooves on the adhesive layer. It is preferable that the groove formed on the adhesive layer is configured not to reach the outer periphery (an edge end portion) of the display panel protective film, and that the depth of the groove is substantially half of the thickness of the adhesive layer. Preferably, a pattern of the grooves formed on the adhesive layer is to have a shape radially formed from the center of the display panel protective film toward the outer periphery of the protective film.

Description

  The present invention relates to a display panel protective film for an electronic device.

  Conventionally, in mobile terminals such as mobile phones and smartphones, there have been many cases in which users use a commercially available surface protective film for the purpose of preventing scratches and fouling of the display screen. With the spread of the spread, the ratio of mobile terminals with the display screen exposed is increased, and the usage rate of the protective film is also greatly increased. For example, Patent Documents 1 to 5 are disclosed.

  Patent Document 1 discloses a touch panel protective sheet having a stripe-like slightly adhesive layer portion on the back surface of a film body for neatly attaching the touch panel to the operation surface.

  Patent Document 2 discloses a protective sheet for a liquid crystal display device that protects a liquid crystal panel from an impact such as dropping by applying a slightly adhesive pressure sensitive adhesive.

  Patent Document 3 discloses a surface protective film having a pressure-sensitive adhesive layer that can be prevented from being lifted from an adherend even when exposed to a heated / pressurized environment and can be peeled off with excellent removability. Or a sheet is disclosed.

  Patent Document 4 discloses a large-sized pressure-sensitive adhesive sheet provided with a taper-type groove and a through-hole and having a pressure-sensitive adhesive layer on a base material sheet.

  Patent Document 5 discloses a display screen protection sheet in which a large number of pasting portions made of a releasable glue are discontinuously formed along the peripheral edge position of the back surface of a transparent plastic sheet substrate.

JP 2009-146441 A JP 2008-233893 A JP 2006-130672 A JP 2005-336249 A Utility Model Registration No. 3163239

  Each disclosure of the above prior art document is incorporated herein by reference. The following analysis has been made from the viewpoint of the present invention.

  However, in these conventional protective films, there is a problem that bubbles remain between the attached protective film and the screen of the mobile terminal, and the display screen does not look clean. It is enough.

  For example, according to Patent Literature 1, when a protective sheet is attached on a touch panel, a slightly adhesive layer portion is formed on the entire surface of the PET film body when the back surface of the PET film body has a striped slightly adhesive layer portion. Compared to the configuration, the generation of bubbles and the entrapment of foreign matter are less likely to occur, but in this conventional technology, the portion with the adhesive layer is formed in a stripe shape on the display screen, so There is a problem that a difference in refraction can be made and it is not suitable for a high-definition display screen.

  Therefore, further improvement is necessary to cope with the further development of electronic devices that have exposed display screens such as smartphones that develop with rapid evolution.

  Therefore, an object of the present invention is to provide a display panel protective film for an electronic apparatus that can realize a clean display screen without bubbles remaining.

  In one aspect of the present invention, there is provided a display panel protective film comprising at least a film layer, an adhesive layer, and a surface coating layer, and having grooves formed in the adhesive layer. Here, the groove formed in the adhesive layer is preferably formed so as not to reach the outer periphery (edge end) of the display panel protective film, and the depth of the groove is the thickness of the adhesive layer. The depth is preferably about half the depth. Furthermore, the pattern of the groove formed in the adhesive layer is a pattern that is formed radially from the center of the display panel protective film toward the outer periphery of the protective film, or a shape that is formed in parallel in an oblique direction. The pattern is preferably.

  Therefore, according to the present invention, the first effect is that even when the protective film is applied, there is no remaining bubbles, and a clean and distortion-free display screen can be realized. Since the groove is formed in the adhesive layer of the display panel protective film, bubbles can be easily pushed out by rubbing along the direction of the groove, and the step of the groove is filled with the elasticity and fluidity of the adhesive layer. And clear display without distortion.

  The second effect is that the groove is formed in the adhesive layer, and after extruding and sticking bubbles, the same effect as the suction cup is obtained, and it is difficult to peel off. This is because the groove formed in the adhesive layer is formed so as not to reach the outer periphery (edge portion) of the display panel protective film. After extruding air bubbles and air in the groove, the originally grooved part is filled with the elasticity and fluidity of the resin of the adhesive layer, but due to the suction effect of this groove part, it is difficult to peel off from the screen or panel of the mobile terminal Sex can be obtained.

It is the conceptual diagram which looked at one Embodiment of the display panel protective film of this invention from the adhesive surface side, and its AA sectional drawing. It is a figure which shows the form and effect | action at the time of using one Embodiment of the display panel protective film of this invention. It is a figure which shows the form and effect | action at the time of using one Embodiment of the display panel protective film of this invention. It is a figure which shows another embodiment of the display panel protective film of this invention.

  The outline of one embodiment of the present invention will be described below. Note that the reference numerals of the drawings attached to this summary are merely examples for facilitating understanding, and are not intended to limit the present invention to the illustrated embodiment.

  The display panel protective film which concerns on one embodiment of this invention is a display panel protective film affixed in order to prevent the damage | wound or peep prevention of the liquid crystal display panel or touch panel of a portable terminal, and with respect to the liquid crystal display panel or touch panel of a portable terminal The adhesive layer has a structure in which a groove is formed. The groove serves as a passage for bubbles, reduces entrainment of bubbles, facilitates extrusion of bubbles, and does not leave bubbles on the attachment surface.

  Such a display panel protective film is formed so that the groove formed in the adhesive layer does not reach the outer periphery (edge portion) of the display panel protective film, so that the backflow of bubbles from the outer periphery of the display panel protective film In addition, a sucker effect is achieved in which adhesion to the liquid crystal display panel or touch panel of the mobile terminal is maintained.

  In addition, in such a display panel protective film, as described above, the shape of the groove formed in the adhesive layer is not particularly limited as long as it is a shape that does not leave bubbles and can obtain a sucker effect. It is desirable that the depth is about half of the thickness. Thereby, entrainment of bubbles is reduced and the remaining bubbles are easily pushed out. The shape of the groove itself may be any shape such as a U shape, a V shape, or a semicircular shape, and if the depth of the groove is about half the thickness of the adhesive layer, the groove itself The shape of is not particularly limited.

  Furthermore, in such a display panel protective film, the groove formed in the adhesive layer is not particularly limited as long as it is a groove pattern that does not leave bubbles and can obtain a suction effect. For example, the display panel protective film It may be a groove pattern formed radially from the center, a pattern formed parallel to an oblique direction, a vertical or horizontal pattern, or the like. Especially, it is preferable that the pattern of the groove | channel formed in the adhesion layer is a pattern formed radially from the center of a display panel protective film especially. By rubbing the remaining bubbles outward along the grooves of this pattern, the remaining bubbles can be easily pushed out. In addition, when the display panel protective film is attached to the liquid crystal display panel or touch panel of the mobile terminal, the groove pushes out the bubbles by pressing from the surface along the groove pattern formed in the adhesive layer. It is filled with elasticity and fluidity, and displays without distortion.

  By forming a groove in the adhesive layer of the display panel protective film, it is possible to make air bubbles pass through, making it difficult for air bubbles to be involved, and further facilitating the extrusion of the air bubbles.

In addition, although a part or all of said embodiment may be described like the following forms, it is not restricted to the following.
[Mode 1] As in the first aspect, the display panel protective film includes at least a film layer, an adhesive layer, and a surface coating layer, and a groove is provided in the adhesive layer.
[Mode 2] The groove formed in the adhesive layer is preferably formed so as not to reach the outer periphery (edge portion) of the display panel protective film.
[Mode 3] It is preferable that the depth of the groove formed in the adhesive layer is about half the thickness of the adhesive layer.
[Mode 4] The groove pattern formed in the adhesive layer is preferably formed radially from the center of the display panel protective film toward the outer periphery of the protective film.
[Mode 5] It is preferable that the groove pattern formed in the adhesive layer is formed in parallel in an oblique direction.

  An embodiment of the present invention will be described below with reference to the drawings. In the following description, the reference numerals of the drawings are added for understanding of the invention, and are not intended to limit the present invention to the illustrated embodiments.

  As shown in FIG. 1, the display panel protective film as an embodiment of the present invention has a configuration including a PET film layer 11, an adhesive layer 12 having grooves 14 formed thereon, and a surface coating layer 13. Here, the groove 14 formed in the adhesive layer 12 is formed in a pattern that radially extends from the center of the adhesive layer 12 toward the outer periphery of the display panel protective film, and does not reach the outer periphery (edge) of the display panel protective film. The groove 14 formed in the adhesive layer 12 is semicircular or U-shaped, and its depth is about half the thickness of the adhesive layer. In Example 1, the display panel protective film having such a configuration, that is, the groove 14 formed in the adhesive layer 12 pushes out the air bubbles that are involved when being attached to the display panel of the mobile terminal to the outside of the film. be able to.

  Further, the groove 14 of the adhesive layer 12 is attached to the display panel of the mobile terminal and pushes out the bubbles, and then the surface is pressed down so that it adheres to the screen of the display panel due to the fluidity and elasticity of the adhesive layer 12. Display distortion and bubble backflow do not occur. Here, the reason why the backflow of bubbles does not occur is that the grooves 14 formed in the adhesive layer 12 are formed so as not to reach the outer periphery (edge portion) of the display panel protective film. Furthermore, the pressure-sensitive adhesive layer 12 is given elasticity and a certain degree of fluidity, and the pressure-sensitive adhesive layer 12 is crushed by applying a pressure of a certain level or more, and the groove 14 is filled by flowing, so that the adhesion surface Flatness and adhesion are ensured.

  Next, the mode of use and its operation when the display panel protective film of Example 1 having the above-described configuration is attached to a liquid crystal display panel or a touch panel of a portable terminal will be described.

  As shown in FIG. 2, the display panel protective film 10 according to the first embodiment is used by being attached to the screen portion 21 of the mobile terminal 20 so as to be aligned. At that time, when the conventional display panel protective film is pasted, as shown in FIG. 3, the bubbles 31 are caught between the screen portion 21 and the display panel protective film 10, and the bubbles 31 remain in the display portion. It was often.

  Therefore, in the display panel protective film 10 of Example 1, since the groove 14 is formed on the adhesive layer 12 as shown in FIGS. 1 and 3, the remaining bubbles 31 radiate outward along the groove 14. By rubbing, the bubbles 31 can be easily pushed out. Further, by pressing from the surface along the groove 14, the groove 14 extrudes the bubbles 31 and at the same time is filled with the elasticity and fluidity of the adhesive layer 12, thereby realizing a display without distortion.

  Here, since the groove 14 formed in the adhesive layer 12 is formed so as not to reach the outer periphery (edge portion) of the display panel protective film 10, the bubbles 31 are once pushed out to the outside of the display panel protective film 10. If discharged, the backflow of bubbles from the outer periphery of the display panel protective film is prevented, and furthermore, the suction effect that the adhesiveness with the liquid crystal display panel or touch panel of the mobile terminal is maintained is achieved, and the adhesiveness that is difficult to peel off from the screen part 21 Get.

  Next, a display panel protective film according to another embodiment of the present invention will be described. In addition, about the point which the display panel protective film of a present Example has the structure and function similar to the display panel protective film which concerns on the said Example, the description of the said Example shall be referred suitably.

  Referring to FIG. 4, the grooves 14 formed in the adhesive layer 12 are formed in parallel in an oblique direction. In this case, similar to the example of FIGS. 1 to 3, the same effect can be obtained by extruding bubbles in an oblique direction. Furthermore, the effect is the same whether the pattern shape or arrangement direction of the grooves 14 is vertical or horizontal.

  The present invention is effective for protecting the display unit of an electronic device such as a mobile phone with the display unit exposed, and in particular, further development is being pursued, such as a mobile phone terminal, a smartphone, and a tablet device. The present invention can be used for a portable small electronic device whose display unit is exposed.

  It should be noted that the disclosures of prior art documents such as the above patent documents are incorporated herein by reference. Within the scope of the entire disclosure (including claims) of the present invention, the embodiments and examples can be changed and adjusted based on the basic technical concept. Further, various combinations or selections of various disclosed elements (including each element of each claim, each element of each embodiment, each element of each drawing, etc.) are possible within the scope of the claims of the present invention. It is. That is, the present invention of course includes various variations and modifications that could be made by those skilled in the art according to the entire disclosure including the claims and the technical idea.

  Further problems, objects, and developments of the present invention will become apparent from the entire disclosure of the present invention including the claims.

DESCRIPTION OF SYMBOLS 10 Display panel protective film 11 PET film layer 12 Adhesive layer 13 Surface coating layer 14 Groove 20 Portable terminal 21 Screen part 31 Bubble

Claims (5)

  A display panel protective film comprising at least a film layer, an adhesive layer, and a surface coating layer, wherein a groove is provided in the adhesive layer.   The display panel protective film according to claim 1, wherein the groove formed in the adhesive layer is formed so as not to reach an outer periphery (edge portion) of the display panel protective film.   3. The display panel protective film according to claim 1, wherein a depth of the groove formed in the adhesive layer is about half of a thickness of the adhesive layer. 4.   4. The groove pattern formed in the adhesive layer is formed radially from the center of the display panel protective film toward the outer periphery of the protective film. 5. Display panel protective film according to 1.   The display panel protective film according to any one of claims 1 to 3, wherein the groove pattern formed in the adhesive layer is formed in parallel in an oblique direction.

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