BRIGHTNESS ENHANCEMENT FILM

摘要

Provided is a brightness enhancement film, wherein a sheet contains double refraction sea-island fiber, having an island part grouping extending from the center of two or more spinning cores, therein. As the brightness enhancement film of the present invention has the sheet containing double refraction sea-island fiber, having an island part grouping extending from the center of two or more spinning cores, therein, a light modulation interface is formed between the island part and a sea part, thereby maximizing light modulation effects as compared to conventional double refraction fiber. Specifically, the double refraction sea-island fiber of the present invention prevents the aggregation (bonding) of island parts at the center of the sea-island fiber even when the number of island parts is 500 or more. As a result, the double refraction sea-island fiber of the present invention is provided with a maximized area of the light modulation interface as compared to a conventional sea-island fiber having a single spinning core, thereby remarkably improving light modulation effects. Therefore, the film of the present invention using the sea-island fiber of the present invention significantly enhances brightness as compared to conventional films having sheets in which a double refraction fiber or a double refraction sea-island fiber with a single spinning core is used.