Light guide device and backlight module using the same

摘要

A light guide device ( 60 ) and a backlight module using the same. The light guide device includes: an incident surface ( 61 ); an emitting surface ( 64 ) adjacent to the incident surface; a reflecting surface ( 62 ) opposited to the emitting surface; a plurality of first V-shaped structures ( 644 ) formed on the emitting surface; and a plurality of second V-shaped structures ( 622 ) formed on the reflecting surface and perpendicular to the first V-shaped structures, wherein respective heigths of the second V-shaped structures increase with increasing distance from the incident surface and respective distances between adjacent second V-shaped structures decrease with increasing distance from the incident surface. The light guide device of the present invention does not need optical elements, and thus has a simple structure. A backlight module using the same light guide plate is also provided.