Optical film and lighting device comprising the same
First Claim
1. An optical film comprising a base and a plurality of optical patterns having peak and valley portions formed on a surface of the base,wherein pitches of the optical patterns, heights of the peak portions and depths of the valley portions are irregular, and the optical patterns have a non-linear non-symmetrical arrangement structure in which the peak and valley portions are irregularly bent as viewed from top and side;
- wherein the peak portions of the optical patterns have a defect correction structure thereon, the defect correction structure itself having peak and valley portions which are formed in a height region of less than 30% from an apex of the peak portion and are irregularly bent as viewed from top and side; and
wherein adjacent peak portions and valley portions are connected by sloped portions which are devoid of such defect correction structures.
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Accused Products
Abstract
An optical film is formed with a plurality of optical patterns having peak and valley portions and a lighting device may include such an optical film. Pitches of the optical patterns, heights of the peak portions and depths of the valley portions are irregular, and plan and side structures of the optical patterns have a non-linear non-symmetrical arrangement structure in which the peak and valley portions are irregularly bent. According to an optical film and a lighting device including such an optical film, a moiré phenomenon can be prevented in advance, abrasion resistance can be improved, optical defects such as scratches cannot be observed with the naked eye, a wet-out phenomenon can be prevented, and a viewing angle can be broadened.
34 Citations
19 Claims
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1. An optical film comprising a base and a plurality of optical patterns having peak and valley portions formed on a surface of the base,
wherein pitches of the optical patterns, heights of the peak portions and depths of the valley portions are irregular, and the optical patterns have a non-linear non-symmetrical arrangement structure in which the peak and valley portions are irregularly bent as viewed from top and side; -
wherein the peak portions of the optical patterns have a defect correction structure thereon, the defect correction structure itself having peak and valley portions which are formed in a height region of less than 30% from an apex of the peak portion and are irregularly bent as viewed from top and side; and wherein adjacent peak portions and valley portions are connected by sloped portions which are devoid of such defect correction structures. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A lighting device, comprising:
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a surface light source; a panel provided over the surface light source; and an optical film interposed between the surface light source and the panel to focus and refract light emitted from the surface light source to the panel, wherein; the optical film comprises a base and a plurality of optical patterns having peak and valley portions formed on a surface of the base; and pitches of the optical patterns, heights of the peak portions and depths of the valley portions are irregular, and the optical patterns have a non-linear non-symmetrical arrangement structure in which the peak and valley portions are irregularly bent as viewed from top and side; and
wherein;the peak portions of the optical patterns have a defect correction structure thereon, the defect correction structure itself having peak and valley portions which are formed in a height region of less than 30% from an apex of the peak portion and are irregularly bent as viewed from top and side; and wherein adjacent peak portions and valley portions are connected by sloped portions which are devoid of such defect correction structures.
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Specification