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US 11,958,987 B2Granted
Cover window for flexible display device and flexible display device
AssigneeLG Chem, Ltd.
InventorsJin Young Park, Bi Oh Ryu, Young Ji Tae, Youngseok Park, Yongjoon Heo, Yeongrae Chang
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Abstract
The present disclosure relates to a cover window for a flexible display device including a polymer substrate including a polyamide resin; and a hard coating layer formed on at least one surface of the polymer substrate, wherein a yellow index of the polymer substrate measured in accordance with STM E 313 is 4.00 or less, and an elastic modulus of the polymer substrate measured at a strain rate of 12.5 mm/min in accordance with ISO 527-3 is 4 to 9 GPa.
Claims16
A cover window for a flexible display device, comprising a polymer substrate comprising a polyamide resin;
- and a hard coating layer formed on at least one surface of the polymer substrate,
- wherein the polyamide resin comprises a first polyamide segment and a second polyamide segment, each polymide segment containing a benzene-1,3-dicarbonyl group and a benzene-1,4-dicarbonyl group in a different molar ratio,
- the polymer substrate has a yellow index of 4.00 or less as measured in accordance with STM E 313, and
- an elastic modulus of 4 to 9 GPa as measured at a strain rate of 12.5 mm/min in accordance with ISO 527-3.
1 more element
Dependencies are inferred from the claim text.