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US 2024/0255676 A1Published application
Optical film having excellent folding performance and display device comprising same
AssigneeKolon Industries, Inc.
InventorsHak-Gee JUNG, Hyo Jun PARK
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Abstract
The present invention provides: an optical film comprising a polymer resin and having the yellowness index of 3.0 or less and the folding performance parameter of 1.5 GPa or less; and a display device comprising the optical film.
Claims18
An optical film comprising a polymer resin and having a yellowness index of 3.0 or less and a parameter of restoring force after folding, calculated using the following Equation 1, of 1.5 GPa or less:
- Parameter
-
- of
-
- restoring
-
- force
-
- after
-
- folding
- =
- E
- ′
- *
- d
- {
- (
- 1000
- *
- R
- )
- +
- d
- 2
- }
- [
- Equation
-
- 1
- ]
- wherein R is 0.5 mm, which is a radius of curvature of the optical film in a centerline of a fold when folded;
- d is a thickness of the optical film, which is expressed as μm;
- and
- E′ is an elastic strain index calculated using the following Equation 2,
- wherein only numbers, excluding units, are applied to the radius of curvature and thickness in Equation 1,
- Elastic
-
- strain
-
- index
-
- (
- E
- ′
- )
- =
- E
- /
- (
- 1
- -
- v
- 2
- )
- [
- Equation
-
- 2
- ]
- wherein E is a modulus of the optical film, expressed as GPa, and
- v is a Poisson's ratio of the optical film.
59 more elements
Dependencies are inferred from the claim text.