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US 2021/0240226 A1Published application
Cover window for flexible display device and flexible display device
AssigneeLG Chem, Ltd.
InventorsJin Young PARK, Yunah YU, Duk Hun JANG, Yongjoon HEO, Yeongrae CHANG
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Abstract
The present disclosure relates to a cover window for a flexible display device and a flexible display device including the cover window, wherein the cover window includes a polymer substrate including a polyamideimide block copolymer; and a hard coating layer formed on at least one surface of the polymer substrate and having a pencil hardness of 5H or more under a load of 750 g, and no crack occurs when wound on a mandrel having a diameter of 3 mm.
Claims15
A cover window for a flexible display device, comprising
- a polymer substrate comprising a polyamideimide block copolymer having a repeating unit containing an aromatic group;
- and
- a hard coating layer formed on at least one surface of the polymer substrate and having a pencil hardness of at least 5H under a load of 750 g,
- wherein the polyamideimide block copolymer comprises an imide block having an imide repeating unit containing an aromatic tetravalent functional group;
- and an imide block having an amide repeating unit containing an aromatic divalent functional group,
- at least one fluorine-containing functional group is substituted in at least one of the imide repeating unit containing the aromatic tetravalent functional group and the amide repeating unit containing the aromatic divalent functional group, and
- no crack occurs on the cover window when the cover window is wound on a mandrel having a diameter of 3 mm.
4 more elements
Dependencies are inferred from the claim text.