US-12617184-B2 - Glass protective film for covering a curved surface of a portable display, device of adhering the glass protective films to the curved surface of the portable display, and method of adhering the glass protective film to the curved surface using the device

Abstract

Disclosed is a glass protective film for covering a curved surface which protects display areas of a portable display including a flat display area and a curved display area. The glass protective film for covering the curved surface includes a glass film member having a flat area portion corresponding to the flat display area and a curved area portion corresponding to the curved display area and an adhesive layer adhering the entire area of the lower surface of the glass film member to the display area of the portable display.

Inventors

• CHANHYUN PARK
• In Su YOON
• Jae Yong Jeong

Assignees

• WHITESTONE CO., LTD.

Dates

Publication Date

20260505

Application Date

20231108

Priority Date

20160719

Claims (18)

1. 1 . A protective film kit for a portable electronic device having a display with both a flat display area and a curved display area, comprising: a protective film with a flat area portion and a curved area portion, wherein the flat area portion and the curved area portion correspond respectively to the flat display area and the curved display area of the portable electronic device; and a fluid adhesive which spreads between a lower surface of the protective film and the display of the portable electronic device, which is curable by UV light, thereby adhering the lower surface of the protective film to the display of the portable electronic device.
2. 2 . The protective film kit of claim 1 , wherein an adhesive-enhancing pattern having protrusions is formed on the lower surface of the protective film.
3. 3 . The protective film kit of claim 2 , wherein the adhesive-enhancing pattern includes a dotted pattern.
4. 4 . The protective film kit of claim 1 , wherein the fluid adhesive has viscosity of 1 to 500 cps.
5. 5 . Protective film kit of claim 1 , wherein the fluid adhesive includes a UV polymerizable oligomer and a photopolymerization initiator.
6. 6 . The protective film kit of claim 5 , wherein the UV polymerizable oligomer includes one or more selected from the group consisting of a modified acrylic-based oligomer, a polyester-based oligomer, an epoxy-based oligomer, an urethane based oligomer, a polyether-based oligomer, a polyacrylic-based oligomer, and a silicon acrylate-based oligomer, and the photopolymerization initiator includes one or more selected from the group consisting of a benzoin ether-based compound, amine compounds, an α-hydroxy ketone-based compound, a phenyl glyoxylate-based compound, and an acyl phosphine oxide based compound.
7. 7 . The protective film kit of claim 5 , wherein the fluid adhesive further includes a diluent, and the diluents includes one or more selected from the group consisting of a styrene monomer, a methylmethacrylate monomer, an ethylmethacrylate monomer, an n-butylmethacrylate monomer, an iso-butylmethacrylate monomer, a t-butylmethacrylate monomer, a vinylchloride monomer, a vinylacetate monomer, an acrylonitrile monomer, a 2-ethylhexylmethacrylate monomer, a laurylmethacrylate monomer, a methylacrylate monomer, an ethylacrylate monomer, an n-butylacrylate monomer, an isobutylacrylate monomer, a 2-ethylhexylacrylate monomer, an ethylene monomer, and an octadecyl methacrylate monomer; or one or more selected from the group consisting of acrylic acid, methacrylic acid, 2-hydroxyethylmethacrylate, 2-hydroxypropylmethacrylate, dimethylaminoethylmethacrylate, tbutylaminoethylmethacrylate, diethylaminoethylmethacrylate, glycidylmethacrylate, 2-hydroxyethylacrylate, 2-hydroxypropylacrylate, itaconic acid, maleicacid, acrylamide, and N-methylolacrylamide.
8. 8 . The protective film kit of claim 7 , wherein in the fluid adhesive, the content of the UV polymerizable oligomer is 50 to 80 wt %, the content of the diluent is 14 to 49 wt %, and the content of the photopolymerization initiator is 0.5 to 5 wt %.
9. 9 . The protective film kit of claim 1 , wherein the protective film further includes a water-repellent/oil repellent pattern which is formed along an edge of the protective film and made of a polymer material having both water repellency and oil repellency.
10. 10 . The protective film kit of claim 9 , wherein the water-repellent/oil-repellent pattern includes one or more materials selected from the group consisting of polytetrafluoroethylene (PTFE), perfluoroalkoxy (PFA), fluorinated ethylene propylene (FEP), ethylene+tetrafluoroethylene (ETFE), an ethylene tetrafluoroethylene copolymer (ETEE), trichlorotrifluoroethylene (PCTFE), ethylenechlorotrifluoroethylene (ECTFE), polyvinylidene fluoride (PVDF), polyvinyl fluoride (PVF), polyimide (PI), polyether etherketone (PEEK), polyphenylene sulfide (PPS), polyamide (PA), polyacetal (POM), polyamide imide (PAI), polyether sulfone (PES), polyetherimide (PEI), polycarbonate (PC), and polyphenylene ether (PPE).
11. 11 . A protective film kit for a portable electronic device having a display with both a flat display area and a curved display area, comprising: a protective film with a flat area portion and a curved area portion, wherein the flat area portion and the curved area portion correspond respectively to the flat display area and the curved display area of the portable electronic device; and a fluid adhesive which spreads between a lower surface of the protective film and the display of the portable electronic device, which is curable by UV light, thereby adhering the lower surface of the protective film to the display of the portable electronic device, wherein a protrusion is formed on the lower surface of the protective film.
12. 12 . The protective film kit of claim 11 , wherein the protrusion is a dot.
13. 13 . The protective film kit of claim 11 , wherein the fluid adhesive has a viscosity of 1 to 500 cps.
14. 14 . The protective film kit of claim 11 , wherein the fluid adhesive includes a photopolymerization initiator and a diluent.
15. 15 . A protective film kit for a portable electronic device having a display with both a flat display area and a curved display area, comprising: a protective film with a flat area portion and a curved area portion, wherein the flat area portion and the curved area portion correspond respectively to the flat display area and the curved display area of the portable electronic device; and a fluid adhesive which spreads between a lower surface of the protective film and the display of the portable electronic device, which is curable by UV light, thereby adhering the lower surface of the protective film to the display of the portable electronic device, wherein a plurality of protrusions is formed on the lower surface of the protective film.
16. 16 . The protective film kit of claim 15 , wherein the plurality of protrusions includes a dotted pattern.
17. 17 . The protective film kit of claim 15 , wherein the fluid adhesive has viscosity of 1 to 500 cps.
18. 18 . The protective film kit kit of claim 15 , wherein the fluid adhesive includes a photopolymerization initiator and a diluent.

Description

CROSS-REFERENCE TO RELATED APPLICATION This application is a continuation application of co-pending U.S. patent continuation application Ser. No. 17/729,969 titled “GLASS PROTECTIVE FILM FOR COVERING A CURVED SURFACE OF A PORTABLE DISPLAY, DEVICE OF ADHERING THE GLASS PROTECTIVE FILMS TO THE CURVED SURFACE OF THE PORTABLE DISPLAY, AND METHOD OF ADHERING THE GLASS” and filed on Apr. 26, 2022, which is a continuation application of co-pending U.S. patent continuation application Ser. No. 16/588,459 titled “GLASS PROTECTIVE FILM FOR COVERING A CURVED SURFACE OF A PORTABLE DISPLAY, DEVICE OF ADHERING THE GLASS PROTECTIVE FILMS TO THE CURVED SURFACE OF THE PORTABLE DISPLAY, AND METHOD OF ADHERING THE GLASS” and filed on Sep. 30, 2019, which is a continuation application of U.S. patent application Ser. No. 15/226,683 titled “GLASS PROTECTIVE FILM FOR COVERING A CURVED SURFACE OF A PORTABLE DISPLAY, DEVICE OF ADHERING THE GLASS PROTECTIVE FILMS TO THE CURVED SURFACE OF THE PORTABLE DISPLAY, AND METHOD OF ADHERING THE GLASS” and filed on Aug. 2, 2016, now U.S. Pat. No. 10,684,655, which claims the priority of Korean Patent Application No. 10-2016-0091491 filed on Jul. 19, 2016, in the Korean Intellectual Property Office. The disclosures of each of the above applications are incorporated herein by reference. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass protective film for covering a curved surface which is applied to a portable display including a flat display area and a curved display area, a method of adhering the same, and a method of adhering a glass protective film for covering a curved surface using the same. 2. Description of the Related Art In the case of portable displays including a touch screen type display such as a smart phone, since information is input through a user's screen touch, a risk that display areas of these devices are damaged by stabbing, pressing, scratch, and the like is high. In order to protect the portable display from the damage, various protective films are applied. Recently, tempered glass protection films having high hardness and an excellent protective function from external shocks have been widely used. Meanwhile, recently, while appearances of mobile devices are changed, portable displays having a flat display area and a curved display area and the like have been commercialized. In the portable display including the curved area, there is a limit that a protective film applied to the portable display having only a flat display area in the related art may not be applied as it is. Particularly, in the case of the glass protective film, even though glass is molded and prepared according to a curved surface of the portable display to be applied to the portable display, due to a limitation on a manufacturing process, a self-curvature of the portable display varies for each product and a curvature of the manufactured protective glass also varies for each product, and thus there is a problem in that the curved protective glass can not be applied to the portable curved display by the existing method. Therefore, development of a protective film for a curved cover glass which can be applied to the portable display having the curved display area has been urgently required. SUMMARY OF THE INVENTION An object of the present invention is to provide a glass protective film for covering a curved surface which has a flat area and a curved area to be applied to a portable display having a flat display area and a curved display area and can stably adhere the flat area and the curved area to the display area of the portable display. Another object of the present invention is to provide a device of adhering a glass protective film for covering a curved surface capable of adhering the glass protective film for covering the curved surface to the portable display. Yet another object of the present invention is to provide a method of adhering the glass protective film for covering the curved surface to the portable display. According to an aspect of the present invention, provided is a glass protective film for covering a curved surface which protects display areas of a portable display including a flat display area and a curved display area, the glass protective film includes: a glass film member having a flat area portion corresponding to the flat display area and a curved area portion including a curved surface extended from the edge of the flat area portion and corresponding to the curved display area; and an adhesive layer which is formed by spreading and curing the adhesive composition having fluidity between the entire area of the lower surface of the glass film member and the display area of the portable display and adheres the entire area of the lower surface of the glass film member to the display area of the portable display. Preferably, the adhesive composition may have viscosity of 1 to 500 cps. Preferably, the adhesive composition may includ