Touch screen structure with protective film easy to tear

Abstract

The utility model discloses a touch screen structure with a protective film easy to tear off. The touch screen structure comprises a base material, a capacitance sensing layer and a capacitance driving layer are respectively arranged on the upper and lower surfaces of the base material; the upper surface of the capacitive sensing layer is connected with the cover plate through a binder; the capacitor driving layer is connected with the protective film through the insulating layer, and gaps are reserved between the insulating layer and the four edges of the capacitor driving layer. The insulating filling layers are arranged at four corners of the capacitance driving layer and are positioned below the ink at four corners of the cover plate; the protective film comprises a protective film base material, a glue area is arranged on the lower surface of the protective film base material, and non-glue areas located at the four corners of the protective film base material are arranged on the periphery of the glue area. According to the utility model, the insulating filling layer is designed in the ineffective area of the corner of the capacitor driving layer, so that a segment difference exists between the protective film and the back corner of the capacitor driving layer, and the protective film is easy to tear off; the adhesive-free areas at the four corners of the protective film and the back surface of the capacitor driver are suspended, so that the protective film is easy to tear off, the labor cost is low, the scratch risk is reduced, and the production and process yield is improved.

Description

Technical Field

[0001] The utility model relates to a touch screen structure, in particular to a touch screen structure with an easily-tearable protective film. Background Art

[0002] Conventional Metal Mesh touch screens are composed of a cover plate, adhesive, capacitive sensing layer, substrate, capacitive driving layer, insulation, and protective film. When the touch screen and the module are fully bonded, the protective film needs to be removed before attaching the fully bonded OCA (optical adhesive).

[0003] However, in actual operation, since the protective film is very tightly attached to the touch screen, when tearing off the protective film, the corners of the protective film are difficult to tear with a tearing handle, and the vacuum between the protective film and the touch screen cannot be broken, resulting in difficulty in tearing off the film and reducing production efficiency; at the same time, a large force is required to pull the tearing handle, which can easily cause scratches and folds on the corners of the touch screen, reducing the process yield. Utility Model Content

[0004] The utility model aims to overcome the deficiencies of the prior art and to provide a touch screen structure with an easily removable protective film, wherein the protective film is convenient and easy to tear, and the operation is convenient and labor-saving.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a touch screen structure with an easily removable protective film, comprising: a cover plate, an adhesive, a capacitive sensing layer, a substrate, a capacitive driving layer, an insulating layer, an insulating filling layer and a protective film; the upper and lower surfaces of the substrate are respectively provided with a capacitive sensing layer and a capacitive driving layer; the upper surface of the capacitive sensing layer is connected to the cover plate through an adhesive; the capacitive driving layer is connected to the protective film through an insulating layer, and a gap is left between the insulating layer and the four sides of the capacitive driving layer; the insulating filling layer is arranged at the four corners of the capacitive driving layer, and is located below the ink at the four corners of the cover plate.

[0006] Furthermore, the insulating filling layer is composed of an insulating material in a square grid shape or is composed of a plurality of insulating materials with a certain line width and line spacing.

[0007] Furthermore, the insulating layer is an insulating strip in a hollow rectangular shape.

[0008] Furthermore, the protective film comprises a protective film substrate; a glue area is arranged on the lower surface of the protective film substrate; and glue-free areas are arranged around the glue area at the four corners of the protective film substrate.

[0009] Furthermore, the thickness of the adhesive area is 0-25 um.

[0010] Furthermore, the cover plate is made of glass, PC, PMMA, PET, or a two-layer composite plate or a three-layer composite plate formed by copolymerization of PC and PMMA, or an IML formed by injection molding of PC and PMMA.

[0011] Furthermore, the adhesive is liquid silicone water glue or acrylic water glue.

[0012] Furthermore, the substrate is PET, COP, PI, SRF, or Glass.

[0013] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0014] The touch screen structure of the easy-to-tear protective film of the utility model is designed with an insulating filling layer in the invalid area of ​​the edge corner of the capacitor driving layer, so that there is a step difference between the protective film and the back edge corner of the capacitor driving layer, which makes it easy to tear off the protective film; in addition, the surrounding of the protective film is a glue-free area, so that the four edge corners of the protective film and the back of the capacitor driving layer are suspended in the air. When the protective film is torn off with a tearing hand, there is no force between the protective film and the capacitor driving layer, and the protective film can be easily torn off, which greatly reduces labor costs, reduces the risks of scratches and breaks, improves production yield and process yield, has low improvement costs, and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The technical solution of the utility model is further described below in conjunction with the accompanying drawings:

[0016] Figure 1 This is a schematic diagram of the structure of an embodiment of the utility model;

[0017] Figure 2 This is a schematic diagram of the structure of an insulating filling layer and an insulating layer on a substrate in one embodiment of the utility model;

[0018] Figure 3 This is a schematic structural diagram of an insulating filling layer in one embodiment of the utility model;

[0019] Figure 4 This is a schematic structural diagram of an insulating filling layer in another embodiment of the utility model;

[0020] Figure 5 This is a schematic structural diagram of an insulating filling layer in another embodiment of the utility model;

[0021] Figure 6 This is a front view of a protective film in one embodiment of the utility model;

[0022] Figure 7 for Figure 6 Side view of

[0023] Among them: cover plate 1, adhesive 2, capacitive sensing layer 3, substrate 4, capacitive driving layer 5, insulating layer 6, insulating filling area 7, protective film 8, protective film substrate 80, adhesive area 81, and non-adhesive area 82. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0025] The utility model provides a touch screen structure with an easy-to-tear protective film, so as to solve the problem that the protective film in the prior art is difficult to tear off, resulting in low production efficiency; at the same time, a large force is needed to pull the tearing handle, which easily causes scratches and folds on the corners of the touch screen, thereby reducing the process yield.

[0026] For ease of understanding, the specific process in the embodiments of the present application is described below. Figure 1 to Figure 2 A touch screen structure with an easily removable protective film in an embodiment of the present application comprises a cover plate 1, an adhesive 2, a capacitive sensing layer 3, a substrate 4, a capacitive driving layer 5, an insulating layer 6, an insulating filling area 7 and a protective film 8; the upper and lower surfaces of the substrate 4 are respectively provided with a capacitive sensing layer 3 and a capacitive driving layer 5; the upper surface of the capacitive sensing layer 3 is connected to the cover plate 1 through the adhesive 2; the capacitive driving layer 5 is connected to the protective film 8 through the insulating layer 6, and a gap is left between the insulating layer 6 and the four sides of the capacitive driving layer 5; the insulating filling layer 7 is arranged at the four corners of the capacitive driving layer 5, and is located below the ink at the four corners of the cover plate 1.

[0027] In the touch screen structure of the easy-to-tear protective film of the utility model, the insulating filling layer 7 is respectively located in the four corner areas of the capacitive driving layer 5. The corner areas are located below the ink of the cover plate 1 and will not enter the visible area. Therefore, the insulating filling layer 7 does not affect the visual effect of the visible area. By setting the insulating filling layer 7, it can be ensured that there is a step difference between the protective film 8 and the back corners of the capacitive driving layer 5, which makes it easy to tear off the vacuum between the protective film 8 and the touch screen, and convenient to tear off the protective film 8.

[0028] In addition, based on Figures 3 to 5 The insulating filling layer 7 may be a square grid of insulating material filling with a thickness of 5-15 um; or may be a plurality of insulating material fillings with a certain line width and line spacing. Specifically, Figure 5 It is composed of multiple horizontal parallel insulating materials with a certain line width and line spacing. Figure 6 The insulating material is a plurality of obliquely parallel insulating materials with a certain line width and line spacing. The size of the line width and line spacing is determined by the size of the insulating filling layer 7. The parallel angle can be 0-360° with the horizontal direction, and is specifically adjusted according to actual needs.

[0029] Furthermore, the cover plate 1 can be glass, PC, PMMA, PET, or a two-layer composite plate and a three-layer composite plate formed by copolymerization of PC and PMMA, or an IML formed by injection molding of PC and PMMA. At the same time, it can also be a flat 2D cover plate, or a 2.5D or 3D cover plate.

[0030] Furthermore, the capacitive sensing layer 3 and the capacitive driving layer 5 are composed of edge routing and in-plane patterns. The conductive material can be a flexible material such as metal mesh, nanosilver, graphene and carbon nanotubes, or a non-flexible material such as indium tin oxide. The substrate 4 can be a flexible material such as PET, COP, PI, SRF, or a hard material such as Glass.

[0031] Furthermore, the adhesive 2 can be a solid optically transparent adhesive, or a liquid silicone water-based adhesive or acrylic water-based adhesive, which has a high transmittance and high viscosity, and generally has a thickness of 50um, 75um, 100um, or 125um.

[0032] In addition, based on Figure 2 The insulating layer 6 is a milky white or transparent insulating ink, which can be cured by UV curing, baking or IR type thermal curing. The printing thickness is generally between 5 and 15 um, and it mainly plays the role of insulation and sealing. In this embodiment, the insulating layer 6 is a hollow rectangular insulating strip, and there are gaps with the four sides of the capacitor driving layer 5, so as to facilitate the setting position of the insulating filling layer 7, ensure that there is a step difference between the protective film 8 and the back corner of the capacitor driving layer 5, and facilitate the subsequent removal of the protective film 8.

[0033] based on Figure 6 to Figure 7 As a further preferred embodiment of the present application, the protective film 8 is improved accordingly in this embodiment to facilitate the subsequent tearing of the protective film 8. Specifically, the protective film 8 includes a protective film substrate 80, a glue area 81 is provided on the lower surface of the protective film substrate 80, and the glue area 81 is surrounded by glue-free areas 82 located at the four corners of the protective film substrate 80.

[0034] In this way, when the protective film 8 is attached to the back side of the capacitor driving layer 5, the four non-glue areas 82 of the protective film substrate 80 have no colloid and will not directly contact the back side of the capacitor driving layer 5. At the same time, the four corners of the protective film substrate 80 are suspended from the back side of the capacitor driving layer 5. When the protective film 8 is torn off by hand, there is no force between the protective film 8 and the capacitor driving layer 5, so the protective film 8 can be easily torn off, and the operation is convenient and labor-saving.

[0035] Specifically, the protective film 8 is a PET film coated with acrylic or acrylic acid or silicone, the colloid thickness is 10~25um, and the PET substrate thickness is 50 / 75 / 100 / 125um, etc. The protective film 8 in this embodiment is based on the conventional protective film, and the four corners are half-cut, that is, four glue-free areas 82 are produced.

[0036] One of the ways to implement the semi-disconnected treatment is to leave the four corners of the PET substrate uncoated with glue, and only carry out the glue coating on other areas, install an AF coating nozzle on the PET gluing equipment line, and before the colloid is coated on the surface of the PET substrate, first carry out AF treatment on the edge fixed area of ​​the PET substrate at equal distances, adjust the line moving speed and the position of the surface treatment nozzle, as well as the interval time of the AF surface treatment, and a substrate with a certain equal distance of AF treatment can be obtained; in the process of colloid coating, the AF area on the edge of the PET substrate has a relatively high water drop angle and a relatively low surface tension, so the colloid cannot be glued, and the AF treatment on the non-edge area of ​​the PET substrate has a relatively high surface tension, so the colloid can be glued; after gluing, it is baked, and after baking, it is rolled into small rolls, and then the PET glued roll is punched into sheets by a circular knife, and a protective film containing four non-glue areas 82 can be obtained.

[0037] The second way to achieve the semi-cutting treatment is to perform laser treatment on the protective film 8. By setting the laser parameters of the high-precision cold light source laser machine and combining it with the laser drawing of the protective film, the colloid at the four corners of the protective film 8 can be separated from the colloid on the entire surface, and then the colloid separated from the four corners is removed, so that a protective film containing four glue-free areas 82 can be obtained.

[0038] In summary, the touch screen structure with an easy-to-tear protective film of the utility model makes the film tearing process easy, greatly reduces labor costs, reduces the risk of scratches and breaks, improves production yield and process yield, has low improvement costs, and is easy to operate.

[0039] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A touch screen structure with an easily removable protective film, characterized in that: include: A cover plate, an adhesive, a capacitive sensing layer, a substrate, a capacitive driving layer, an insulating layer, an insulating filling layer and a protective film; the upper and lower surfaces of the substrate are respectively provided with a capacitive sensing layer and a capacitive driving layer; the upper surface of the capacitive sensing layer is connected to the cover plate through an adhesive; the capacitive driving layer is connected to the protective film through an insulating layer, and a gap is left between the insulating layer and the four sides of the capacitive driving layer; the insulating filling layer is arranged at the four corners of the capacitive driving layer, and is located below the ink at the four corners of the cover plate.

2. The touch screen structure with an easily removable protective film as claimed in claim 1, characterized in that: The insulating filling layer is composed of an insulating material in a square grid shape or a plurality of insulating materials with a certain line width and line spacing.

3. The touch screen structure with an easily removable protective film as claimed in claim 1, characterized in that: The insulating layer is an insulating strip in a hollow rectangular shape.

4. The touch screen structure with an easily removable protective film as claimed in claim 1, characterized in that: The protective film comprises a protective film substrate; a glue area is arranged on the lower surface of the protective film substrate; and glue-free areas are arranged around the glue area and located at the four corners of the protective film substrate.

5. The touch screen structure with an easily removable protective film as claimed in claim 4, characterized in that: The thickness of the adhesive area is 0-25um.

6. The touch screen structure with an easily removable protective film according to claim 1, characterized in that: The cover plate is made of glass, PC, PMMA, PET, or a two-layer composite plate or a three-layer composite plate formed by copolymerization of PC and PMMA, or an IML formed by injection molding of PC and PMMA.

7. The touch screen structure with an easily removable protective film as claimed in claim 1, characterized in that: The adhesive is liquid silicone water glue or acrylic water glue.

8. The touch screen structure with an easily removable protective film as claimed in claim 1, characterized in that: The substrate is PET, COP, PI, SRF, and Glass.

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