OPTICAL FILM WITH REDUCED DISTORTION, METHOD OF MANUFACTURING THE SAME, AND DISPLAY APPARATUS HAVING THE SAME
First Claim
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1. An optical film comprising:
- a pre-elongated first base film composed of a polymer and having a respective first effective elongation axis extending in a first direction;
a pre-elongated second base film composed of the polymer and having a respective second effective elongation axis extending in a second direction that is different from the first direction;
wherein the first and second base films are bonded to one another directly or indirectly so they form integral parts of the optical film and wherein the bonding is such that the first effective elongation axis crosses at an angle with the second effective elongation axis according to the respective and different first and second directions.
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Abstract
An optical film includes a first base film having a first effective elongation axis that is skewed relative to a first reference line. The optical film further has a second base film having a second effective elongation axis that is opposingly skewed relative to the first reference line. Deformations are offset from each other when the deformations occur in the first and second base films in the directions of the first and second elongation axes due to variation of external temperature and humidity, thereby preventing the first and second base films from being excessively deformed.
15 Citations
19 Claims
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1. An optical film comprising:
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a pre-elongated first base film composed of a polymer and having a respective first effective elongation axis extending in a first direction; a pre-elongated second base film composed of the polymer and having a respective second effective elongation axis extending in a second direction that is different from the first direction; wherein the first and second base films are bonded to one another directly or indirectly so they form integral parts of the optical film and wherein the bonding is such that the first effective elongation axis crosses at an angle with the second effective elongation axis according to the respective and different first and second directions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of manufacturing a composite optical film, the method comprising:
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applying elongation forces to a first preliminary base film according to a first direction and then according to second directions different from the first direction so as to form a second preliminary base film having effective elongation axes defined according to intensities and directions of the cumulative effects of the applied forces; cutting-out the second preliminary base film to form at least one first base film having a first effective elongation axis and forming at least one second base film having a second effective elongation axis by cutting-out the second preliminary base film; bonding the first base film to the second base film; and forming an optical processing layer on the bonded together first and second base films, wherein directions of the effective elongation axes vary depending on regions of the second preliminary base film when the forces acting on regions of the first preliminary base film in the first direction and the second directions vary depending on the regions of the first preliminary base film, and wherein the first and second effective elongation axes cross each other after the first and second base films are bonded together. - View Dependent Claims (14, 15)
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16. A display apparatus comprising:
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a light source generating a light; a display panel receiving the light from the light source to display an image; and an optical film interposed between the light source and the display panel to adjust a traveling path of the light from the light source to the display panel, wherein the optical film comprises; a first base film comprising a light incidence surface to receive the light, a first elongation axis, and a first reference line; a second base film comprising a light exit surface to output the light, a second elongation axis, and a second reference line provided at a position identical to a position of the first reference line when viewed in a plan view, the second base film being coupled with the first base film; and an optical layer provided on at least one of the light incidence surface and the light exit surface to adjust the traveling path of the light, wherein the first elongation axis crosses the second elongation axis on the first and second reference lines when viewed in a plan view. - View Dependent Claims (17, 18, 19)
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Specification