公开(公告)号：US20220236468A1

公开(公告)日：2022-07-28

申请号：US17615433

申请日：2020-05-15

Applicant: TOYOBO CO., LTD.

Inventor： Shotaro NISHIO ,  Kiwamu KAWAI ,  Akira SHIMIZU

IPC: G02B5/30 ,  G09F9/30

Abstract: Provided is a foldable display excellent in mass productivity, and free of a risk of causing distortion in an image displayed at a folding portion thereof after being repeatedly folded. The foldable display includes at least: a surface protective film; a polarizer; and a retardation layer, wherein the surface protective film is a polyester film satisfying the following conditions and having a thickness of from 10 μm to 80 (1) a refractive index in a bending direction is from 1.590 to 1.620; (2) a refractive index in a folding portion direction is from 1.670 to 1.700; (3) a refractive index in a thickness direction is 1.520 or less; and (4) a density is 1.380 g/cm3 or more, wherein the bending direction refers to a direction orthogonal to a folding portion of the polyester film at a time when the polyester film is folded.

公开(公告)号：US20220236467A1

公开(公告)日：2022-07-28

申请号：US17615426

申请日：2020-05-15

Applicant: TOYOBO CO., LTD.

Inventor： Shotaro NISHIO ,  Kiwamu KAWAI ,  Akira SHIMIZU

IPC: G02B5/30 ,  G09F9/30 ,  B32B27/36

Abstract: The present invention provides a polarizing plate for a foldable display free of a risk of causing distortion in an image displayed at a folding portion thereof after being repeatedly folded. The polarizing plate for a foldable display includes: a polarizer; and a polarizer protective film formed of a polyester film laminated on at least one surface of the polarizer, wherein the polyester film satisfies the following conditions: (1) a refractive index in a bending direction is from 1.590 to 1.620; (2) a refractive index in a folding portion direction is from 1.670 to 1.700; (3) a refractive index in a thickness direction is 1.520 or less; and (4) a density is 1.380 g/cm3 or more, wherein the bending direction refers to a direction orthogonal to a folding portion of the polyester film at a time when the polyester film is folded.

公开(公告)号：US20220227950A1

公开(公告)日：2022-07-21

申请号：US17614228

申请日：2020-05-14

Applicant: TOYOBO CO., LTD.

Inventor： Shotaro NISHIO ,  Kiwamu KAWAI ,  Akira SHIMIZU

IPC: C08J5/18 ,  G06F1/16 ,  G06F3/041 ,  G02B3/00

Abstract: Provided is a polyester film for a touchscreen module substrate of a foldable display which is free of occurrence of a crack at a folding portion thereof, in order to provide a foldable display excellent in mass productivity, and free of a risk of causing distortion in an image displayed at a folding portion thereof after being repeatedly folded. The polyester film for a touchscreen module substrate of a foldable display satisfies the following conditions: (1) a refractive index in a bending direction is from 1.590 to 1.620; (2) a refractive index in a folding portion direction is from 1.670 to 1.700; (3) a refractive index in a thickness direction is 1.520 or less; and (4) a density is 1.380 g/cm or more, wherein the bending direction refers to a direction orthogonal to a folding portion of the polyester film at a time when the polyester film is folded.

公开(公告)号：US20220213350A1

公开(公告)日：2022-07-07

申请号：US17614154

申请日：2020-05-14

Applicant: TOYOBO CO., LTD.

Inventor： Shotaro NISHIO ,  Kiwamu KAWAI ,  Akira SHIMIZU

IPC: C09J7/25 ,  C08J7/046 ,  G02B1/14

Abstract: Provided is a laminated film for a foldable display, the laminated film being free of occurrence of a fold mark or a crack at a folding portion thereof, in order to provide, for example, a foldable display excellent in mass productivity, and free of a risk of causing distortion in an image displayed at a folding portion thereof after being repeatedly folded. The laminated film for a foldable display includes: a polyester film having a thickness of from 10 μm to 100 μm; and an adhesive layer formed on at least one surface of the polyester film, wherein the polyester film satisfies the following conditions: (1) a refractive index in a bending direction is from 1.590 to 1.620; (2) a refractive index in a folding portion direction is from 1.670 to 1.700; (3) a refractive index in a thickness direction is 1.520 or less; and (4) a density is 1.380 g/cm3 or more, wherein the bending direction refers to a direction orthogonal to a folding portion of the polyester film at a time when the polyester film is folded.

公开(公告)号：US20220164003A1

公开(公告)日：2022-05-26

申请号：US17429147

申请日：2020-01-15

Applicant: TOYOBO CO., LTD.

Inventor： Shotaro NISHIO ,  Kiwamu KAWAI ,  Akira SHIMIZU ,  Katsuya ITO

IPC: G06F1/16 ,  G02B1/04 ,  G02B1/14 ,  G02B5/30

Abstract: Provided is a foldable display that is excellent in mass production applicability and unlikely to have image distortion at the folding portion of the display after repeated folding, as well as a mobile device equipped therewith. The foldable display contains a surface protection film and a polarizer. The surface protection film is composed of a polyester film, and the angle made by the slow axis of the polyester film with the absorption axis of the polarizer is 10 to 80°. The polyester film has a refractive index in the bending direction of 1.590 to 1.620, a refractive index in the direction of a folding portion of 1.670 to 1.700, a refractive index in the thickness direction of 1.520 or less, and a density of 1.380 g/cm3 or more, wherein the bending direction refers to a direction orthogonal to the folding portion of the polyester film to be folded.