Backlight module and backlight device using the same

A backlight device, comprising:

• a carrier;
• and
• a backlight module, disposed on the carrier, and comprises:
• a first light guide plate, comprising:
• a first body;
• and
• a first turning portion, comprising:
• a first tail section;
• and
• a first connecting section, connecting the first tail section with the first body, wherein the first tail section overlaps with the first connecting section along a first direction;
• a second light guide plate, disposed opposite to the first light guide plate;
• and
• a light source plate, disposed on the first light guide plate and the second light guide plate;
• wherein the first direction is substantially perpendicular to an extension direction of the first body;
• wherein the first body has a first radius of curvature, the first turning portion has a second radius of curvature, and the first radius of curvature is greater than the second radius of curvature.