JP3181526U - Display screen protection sheet - Google Patents

Abstract

An air layer having a uniform thickness is maintained in a sealed state between a display screen protection sheet and a display screen to prevent intrusion of dust and moisture by blocking the entry and exit of air from the outside. When trying to use, it is intended to maintain a uniform contact state over the entire display screen, thereby preventing the generation of visible bubbles on the display screen and eliminating the factors that hinder the detection of changes in capacitance. Provided display screen protection sheet.
A base material having an opening corresponding to a shape of a display screen of a portable information device, a base material having an adhesive layer on the front surface and a removable adhesive layer on the back surface, and the entire surface of the base material surface. The transparent protective layer 14 is adhered to the surface of the base material by the adhesive layer 15 and is attached to the surface of the portable information device by the removable adhesive layer 16 so as to be detachably attached. An air layer is hermetically held between the transparent protective layer 14 and the display screen over the entire surface.
[Selection] Figure 3

Description

  The present invention relates to an improvement in a sheet for protecting a display screen that is attached and used to protect a display screen of a portable information device, particularly a smartphone or a tablet-type information terminal device having a liquid crystal display screen.

  In recent years, portable information devices represented by smartphones and tablet-type information terminal devices have been widely used, and there are a wide variety of display screen protection sheets for protecting display screens composed of liquid crystal display panels of these devices. Manufactured and sold.

Capacitive touch panels are becoming the mainstream of display screens in these devices, and the structure is designed to detect the position by detecting the change in capacitance between the fingertip touching the display screen surface and the conductive film. The screen protection sheet is required to be transparent at least in a portion covering the display screen and not to inhibit detection of a change in capacitance.

On the other hand, in addition to the original screen protection function, display screen protection sheets are also popular as accessories for “dressing” applications that allow users to personally decorate the appearance of portable information devices. In this part, various colors and patterns are displayed and the design is elaborated.

By the way, the conventional display screen protection sheet generates bubbles between the display screen and the back of the sheet when the releasable adhesive layer on the back of the sheet is applied to the surface of the portable information device, and the capacitance changes during use. There is a problem that not only the detection is hindered and the response of the device is deteriorated, but also the appearance of the display screen is impaired.

To solve this problem, for example, solutions like the inventions described in Patent Document 1 and Patent Document 2 have been proposed.
JP 2004-117790 A JP 2012-022291 A

  Since the protective film for display shown in Patent Document 1 is formed by coating an adhesive substance layer with an arbitrary width and thickness along both end edges on one side of the substrate, the adhesive substance layer is applied at the time of application. Air is discharged through the edge where no coating is applied, and bubbles are not generated between the display and the protective film. In addition, the display screen protection sheet described in Patent Document 2 is provided with a large number of discontinuous affixing portions made of a releasable glue along the back surface peripheral position of the substrate. The portion where the portion does not exist forms an air flow path, and air is not generated between the display screen protection sheet and the display screen.

  However, in these prior arts, there is always a space corresponding to the thickness of the adhesive substance layer between the display screen protection sheet and the display screen, and this space is always open to the external space. It is inevitable that dust and moisture get into the space. And every time the surface of the display screen protection sheet is pressed with a finger or the like when using the information device, the space partially expands and contracts due to the pressure to produce a pump-like effect. There is a problem that dust and moisture intrusion into the space further increases.

  The present invention was created to solve this problem, and its basic idea is to keep an air layer of uniform thickness between the display screen protection sheet and the display screen in a hermetically sealed state. By blocking the entry and exit of air, it prevents dust and moisture from entering, and when using the device, it tries to maintain a uniform contact state on the entire display screen, which is visible on the display screen. It is an object to prevent generation of bubbles and to eliminate a factor that hinders detection of change in capacitance.

  In order to achieve this object, the display screen protecting sheet according to claim 1 is provided with an opening corresponding to the shape of the display screen of the portable information device, an adhesive layer on the front surface, and a peelable adhesive on the back surface. And a transparent protective layer that covers the entire surface of the base material. The transparent protective layer is adhered to the surface of the base material by an adhesive layer, and is removable from the surface of the portable information device by a releasable adhesive layer. It is characterized by being attached to and attached to.

  The substrate is provided with an opening corresponding to the shape of the display screen, and the transparent protective layer covers the entire surface of the substrate including the opening, so that the display screen is protected from scratches and dirt, and Even if the material itself is an opaque material, the display screen can be visually recognized and touched with a finger or the like through the transparent protective layer.

Next, the invention described in claim 2 is the display screen protection sheet according to claim 1,
When pasted on the surface of a portable information device, the air layer is hermetically held between the transparent protective layer and the display screen over the entire opening.

  In the display screen protection sheet according to the present invention, the portion covering the opening corresponding to the shape of the display screen does not have an adhesive layer, and the transparent protective layer is the total thickness of the base material, the adhesive layer, and the releasable adhesive layer. The air layer is held on the display screen. Therefore, since the back surface of the transparent protective layer does not directly contact the display screen surface, visible air bubbles cannot be generated unevenly in the first place. In addition, the opening of the base material corresponding to the display screen is sealed with the base material at the time of application to the device surface to form a sealed air layer that does not allow air to enter and exit from the external space. Therefore, dust and moisture do not enter, and the thickness of the air layer does not become uneven depending on the part. Therefore, unless dust or moisture is mixed into the air layer at the time of application, there is no possibility that detection of change in capacitance will be hindered during use of the device.

  Next, the invention described in claim 3 is the display screen protecting sheet according to any one of claims 1 and 2, wherein the thickness of the air layer is more than 0 mm and not more than 0.25 mm. It is characterized by that.

  First, the distance between the transparent protective layer and the display screen can be set arbitrarily depending on the thickness of the adhesive layer and the releasable adhesive layer in addition to the thickness of the base material, but it is not physically zero and must be A constant air layer is created. On the other hand, when the display screen is a capacitive touch panel, the air layer is desirably as thin as possible. According to the experimental results of the prototype by the applicant, in application to a general smartphone touch panel at the time of filing of the present application, there is no problem in detecting a change in capacitance if the thickness of the air layer is 0.25 mm or less. .

  The thickness of the transparent protective layer is arbitrary depending on the size of the information device and its display screen. However, if the thickness is too thin, not only the durability is lowered, but also the air layer thickness is likely to be uneven, while the thickness is too thick. For example, if it is for smartphones, about 0.20 mm is preferable.

  Next, the invention described in claim 4 is the display screen protection sheet according to any one of claims 1 to 3, wherein the substrate has a printed layer on the surface thereof. To do.

  Since the entire surface of the substrate is protected by the transparent protective layer, the material may be paper in addition to the resin sheet. By printing an arbitrary color pattern or pattern directly on the surface of the base material and providing a print layer, it is possible to make a free design through the transparent protective layer.

  Next, the invention described in claim 5 is the display screen protection sheet according to any one of claims 1 to 4, which is attached to the separator with a removable adhesive layer when not attached. It is characterized by being able to be stored.

  The display screen protection sheet is generally sold separately as an accessory for portable information devices such as smartphones, and the display screen protection sheet with a different design is used by the user by replacing it as needed. Is assumed. Therefore, in the distribution as a single product, a sheet-like separator is used to prevent adhesion of dust and the like to the removable adhesive layer and the transparent protective layer and to store the display screen protection sheet when not in use. It is desirable to store it in a state where it is pasted with a re-peelable adhesive layer.

  Next, the invention described in claim 6 is the display screen protecting sheet according to any one of claims 1 to 5, wherein the transparent protective layer is a transparent polycarbonate resin, and the separator is a polyethylene terephthalate. It is a tarato resin.

  The transparent protective layer protects the display screen from being damaged while the information device is being carried, and must be transparent to withstand pressure and friction with fingers when used. Since a certain shape maintaining force is required to equalize the thickness of the air layer, it is desirable to use a transparent material with high impact resistance, wear resistance and deformation recovery property, and transparent polycarbonate resin is particularly suitable. is there. Further, the separator is not required to be as durable as the transparent protective layer, but it is desirable to use a material that can maintain the adhesive strength of the re-peeling adhesive layer even by repeated pasting and peeling, and polyethylene terephthalate resin is particularly suitable. .

  According to the display screen protection sheet of the present invention, the display screen of a portable information device or the like can be effectively protected by the transparent protective layer, and a uniform sealed air layer is maintained between the transparent protective layer and the display screen. Therefore, no visible air bubbles are generated, and dust and moisture can be prevented from entering the air layer from the external space, so that the appearance of the display screen and the touch feeling on the surface are not impaired. It is possible to provide a display screen protecting sheet having a suitable feeling of use that does not hinder detection of change in capacitance. In addition, if the printed layer on the surface of the base material gives a free color pattern or pattern to the product, a variety of designs can be provided. The protective sheet can be freely exchanged and used according to the user's preference.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view illustrating a method for mounting a display screen protection sheet 10 on a portable information device X according to an embodiment of the present invention. A smartphone is illustrated as the portable information device X, and the display screen protection sheet 10 has a transparent opening 11 corresponding to the display screen D, and the portable information is set so that the display screen D and the opening 11 coincide with each other. Affix to the surface of device X and attach. In addition to the opening 11, the display screen protection sheet 10 is provided with through holes corresponding to various mechanisms for operation buttons, speakers, and built-in cameras according to the model of the portable information device X. Also good.

  The back surface protection sheet 20 may be attached to the back surface of the portable information device X. The back surface protection sheet 20 in this figure is provided with a through hole for a back surface built-in camera or the like.

  FIG. 2 is a plan view showing a single product state of the display screen protection sheet 10 and the back surface protection sheet 20 according to an embodiment of the present invention. The sheets 10 and 20 are both detachably attached to the separator 17 by a removable adhesive layer on the back surface. The separator 17 has a larger shape than the main bodies of the sheets 10 and 20 in consideration of the convenience of peeling and re-sticking, but may have a shape that matches the sheets 10 and 20.

  3 is a cross-sectional view showing the transition of the cross-sectional structure taken along the line AA in FIG. 2 and the mounting state on the portable information device X of the display screen protecting sheet 10 according to the embodiment of the present invention. B is a cross-sectional view showing a state in which the display screen protection sheet 10 is adhered to the separator 17, and the inside of the circle is an enlarged view of one cross section of the frame portions on both sides with the opening 11 interposed therebetween. As for the frame part, the adhesive layer 14 is provided on the surface of the substrate 12 having the printed layer 13 on the front side, and the transparent protective layer 14 is adhered. A removable adhesive layer 15 is provided on the back side of the substrate 12, and a separator 17 is affixed thereto. B shows the process of peeling the separator 17 to expose the releasable adhesive layer 15 and affixing and attaching it to the surface of the portable information device X. FIG. It is an enlarged view of one cross section of. At the time of mounting, the air layer G is sealed between the transparent protective layer 14 and the display screen D.

  4 to 7 are perspective views continuously showing manufacturing steps of the display screen protecting sheet 10 according to the embodiment of the present invention. FIG. 4 is a perspective view showing a first step of forming the adhesive layer 15 and the releasable adhesive layer 16 on the substrate 12. In this figure, the base material 12 is a material that is assumed to form five display screen protection sheets 10 at a time, and an arbitrary design or pattern is printed in advance on the front side of the printing layer 13. A wide double-sided adhesive sheet that forms the adhesive layer 15 is bonded to the front side, and a wide double-sided adhesive sheet that forms the removable adhesive layer 16 is bonded to the back side. In addition, it is appropriate that the wide double-sided adhesive sheet on the back side has a two-layer structure in which the front side has an adhesive layer having no removability and the back side has a removable pressure-sensitive adhesive layer.

  FIG. 5 is a perspective view showing a second step in which five openings 11 are punched out by die cutting with a Thomson blade on the base material 12 in which the adhesive layer 15 and the releasable adhesive layer 16 are bonded and integrated.

  FIG. 6 is a perspective view showing a third step in which the transparent protective layer 14 is bonded to the front surface adhesive layer 15 of the substrate 12 punched with the opening 11 and the separator 17 is bonded to the removable adhesive layer 16 on the back side. . In this step, the opening 11 is covered with the transparent protective layer 14.

FIG. 7 is a perspective view showing a fourth step in which the display screen protection sheet 10 is punched out again from the base material 12 with the transparent protective layer 14 and the separator 17 attached and integrated by die cutting with a Thomson blade. At this time, through holes corresponding to various mechanisms for the operation button, the speaker, and the built-in camera are simultaneously punched, and unnecessary parts that have been punched are removed to complete the product.
The Thomson blade is used in combination of a blade that punches from the transparent protective layer 14 to the separator 17 at once and a blade that punches only the transparent protective layer 14 to the releasable adhesive layer 16 and leaves the separator 17. Thus, the separator 17 is left on the outer periphery of the punched display screen protection sheet 10 so as to protrude as a marginal portion, and the convenience in peeling the display screen protection sheet 10 from the separator 17 in the finished product is improved. be able to.

  As mentioned above, although embodiment of this invention was described referring drawings, this invention is not necessarily limited only to the structure mentioned above, In the range which achieves the objective of this invention and has an effect, suitably As long as they can be modified and fall within the scope of the technical idea of the present invention, they belong to the technical scope of the present invention. For example, the printing layer 12 may not be provided on the base material 12, and the color pattern or pattern of the material of the base material 12 itself may be used as the design. In addition, when the surface material of the portion other than the display screen D of the portable information device X is made of metal, by using a magnetic sheet as the base material 12, the magnetism of the base material 12 without providing a removable adhesive layer. It is good also as a structure made to adsorb | suck to the surface of the portable information device X. In addition, although the present invention is premised on being mounted on a portable information device, the present invention is not limited to being portable and can be applied to a display screen protection sheet for a desktop display device.

The display screen protection sheet according to the present invention can be used as an improved accessory product for display screen protection and appearance decoration of touch panel or touch screen portable information devices such as smartphones and tablet computers. Have

The perspective view which shows the mounting method to the portable information device of the display screen protection sheet Plan view showing the state of a single product for the display screen protection sheet Sectional drawing which shows transition of the mounting state to the cross-sectional structure of a display screen protection sheet and a portable information device The perspective view which shows the process of providing a contact bonding layer and a releasable adhesion layer in a base material. The perspective view which shows the state which provided the opening part corresponding to the shape of a display screen in a base material The perspective view which shows the process of adhere | attaching a transparent protective layer and a separator on a base material. The perspective view which shows the process of punching the display screen protection sheet from the processed substrate

X portable information device D display screen G air layer 10 display screen protection sheet 11 opening
12 Substrate 13 Printed layer 14 Transparent protective layer 15 Adhesive layer 16 Removable adhesive layer 17 Separator 20 Back surface protection sheet

Claims (6)

  An opening corresponding to the shape of the display screen of the portable information device is provided. The substrate has an adhesive layer on the front surface and a removable adhesive layer on the back surface, and a transparent protective layer covering the entire surface of the substrate surface. A display screen protection sheet comprising a transparent protective layer adhered to a substrate surface by an adhesive layer and detachably attached to a surface of a portable information device by a releasable adhesive layer. Sheet.   2. The display screen protection sheet according to claim 1, wherein an air layer is hermetically held between the transparent protective layer and the display screen over the entire surface of the opening when being attached to the surface of the portable information device. .   The display screen protecting sheet according to claim 1 or 2, wherein the air layer has a thickness of more than 0 mm and 0.25 mm or less.   The display screen protection sheet according to claim 1, wherein a printed layer is provided on a surface of the base material.   The display screen protecting sheet according to any one of claims 1 to 4, wherein the sheet can be stored by being attached to a separator with a removable adhesive layer when not attached. The display screen protection sheet according to claim 1, wherein the transparent protective layer is a transparent polycarbonate resin, and the separator is a polyethylene terephthalate resin.

Images