Patent ID: 7961270

Claim:
A display device, comprising: a light guide having a first edge extending along a first direction and a second edge adjacent to the first edge; a light source, arranged adjacent to the second edge, being capable of emitting light along the first direction into the second edge; a first brightness enhancement film (BEF), disposed on the light guide, the first BEF having a plurality of prisms along a second direction, the second direction rotating counterclockwise a first angle with respect to the first direction, and the first angle ranging from 0° to 90°; and a dual brightness enhancement film (DBEF), disposed on the first BEF, the DBEF having a transmission axis extending along a third direction, the third direction rotating counterclockwise a second angle with respect to the first direction, and the second angle ranging from 40° to 50°; and a display panel, disposed on the DBEF.