OPTICAL SHEET, BACKLIGHT ASSEMBLY AND DISPLAY DEVICE HAVING THE SAME

摘要

An optical sheet, a backlight assembly including the same, and a display device are provided to improve light condensing efficiency of the backlight assembly and image quality of the display device by forming light condensing parts having different pitches in the optical sheet. A plurality of convex light condensing parts(12) are formed on a surface of a base film. Each of the condensing parts includes a first curved surface(13), a second curved surface(15), a third curved surface(17), and a fourth curved surface(19). The first curved surface is formed clockwise along a side surface of a first cylinder having a first axis included in the surface. The second curved surface is formed counterclockwise along a side surface of the first cylinder so as to be opposite to the first curved surface. The third curved surface is formed clockwise along a side surface of a second cylinder having a second axis being perpendicular to the first axis in the surface, and is connected to the first curved surface and the second curved surface. The fourth curved surface is formed counterclockwise along the side surface of the second cylinder, and is connected to the first curved surface and the second curved surface.