Window and display device having the same
AssigneeSamsung Display Co., Ltd.
InventorsHeonjung Shin, Jeoungsub Lee, Hyun Joon Oh
Life of this patent
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Abstract
A window for a display device includes: a film having flexibility; and at least one coating layer disposed on the film. As tensile stress acting on the film increases, the film is elastically deformed in a first range of strains of the film and plastically deformed in a second range of strains of the film greater than the first range, the first and second ranges being defined by a relationship between the tensile stress and a strain of the film in accordance with the tensile stress. The film has a yield strain in a third range from about 1.9% to about 2.25%, and the yield strain is defined as the strain of the film when a yield stress of the relationship in the first range is applied to the film.
Claims18
A window for a display device, the window comprising:
- a film having flexibility;
- and
- at least one coating layer disposed on the film, wherein:
- as tensile stress acting on the film increases, the film is elastically deformed in a first range of strains of the film, the strains of the film in the first range having a linear relationship with the tensile stress, and plastically deformed in a second range of strains of the film greater than the first range, the strains of the film in the second range having a non-linear relationship with the tensile stress;
- and
- as maximum tensile stress, a yield stress, in the first range is applied to the film, the film has a yield strain in a third range from about 1.9% to about 2.25%, wherein the yield strain is determined by comparing the shape of the film after the yield stress is applied to the film with the shape of the film before the tensile stress is applied,
- wherein the film satisfies all of the following material property conditions:
- (1) the yield strain:
- a range from about 1.9% to about 2.25%,
- (2) a plastic index:
- equal to or greater than about 0.5,
- (3) a restoration rate:
- a range from about 85% to about 100%,
- (4) a creep strain:
- a range from about 0% to about 20%, and
- (5) a creep residual strain:
- a range from about 0% to about 20%.
A display device comprising:
- a display panel;
- and
- a transparent protector disposed on the display panel, the transparent protector comprising:
- a film having a flexibility;
- and
- at least one coating layer disposed on the film, wherein:
- as tensile stress acting on the film increases, the film is elastically deformed in a first range of strains of the film, the strains of the film in the first range having a linear relationship with the tensile stress, and plastically deformed in a second range of strains of the film greater than the first range, the strains of the film in the second range having a non-linear relationship with the tensile stress;
- and
- as maximum tensile stress, a yield stress, in the first range is applied to the film, the film has a yield strain in a third range from about 1.9% to about 2.25%, wherein the yield strain is determined by comparing the shape of the film after the yield stress is applied to the film with the shape of the film before the tensile stress is applied,
- wherein the film satisfies all of the following material property conditions:
- (1) the yield strain:
- a range from about 1.9% to about 2.25%,
- (2) a plastic index:
- equal to or greater than about 0.5,
- (3) a restoration rate:
- a range from about 85% to about 100%,
- (4) a creep strain:
- a range from about 0% to about 20%, and
- (5) a creep residual strain:
- a range from about 0% to about 20%.
Dependencies are inferred from the claim text.