Backlight module and naked-eye stereoscopic display device

A naked-eye stereoscopic display device, comprising:

• a backlight module, including:
• a light guide plate assembly, comprising:
• a first light guide plate, having a first light incident surface, a first light exiting surface, a first bottom surface, and a plurality of first light guide structures, wherein the first light exiting surface and the first bottom surface are respectively located on opposite sides of the first light guide plate and connected to the first light incident surface, and the plurality of first light guide structures are formed on the first bottom surface;
• wherein the first light guide structure has a first bevel forming a first included angle with respect to the first bottom surface, the first included angle of the first light guide structure is greater than or equal to 1° and less than or equal to 6°, and is away from the first incident surface;
• and
• a second light guide plate, disposed on the first light guide plate and having a second light incident surface, a second light exiting surface, a second bottom surface, and a plurality of second light guide structures, wherein the second light exiting surface and the second bottom surface are respectively located on opposite sides of the second light guide plate and connected to the second light incident surface, the second bottom surface faces the first light exiting surface of the first light guide plate, and the plurality of second light guide structures are formed on the second bottom surface;
• wherein the second light guide structure has a first bevel forming a first included angle with respect to the second bottom surface, the first included angle of the second light guide structure is greater than or equal to 1° and less than or equal to 6°, and is away from the second incident surface;
• a reverse prism sheet, disposed on the second light guide plate and comprising a substrate and a plurality of prismatic structures, wherein the plurality of prismatic structures are disposed on the substrate, extend along a first direction, and face the second light exiting surface of the second light guide plate;
• wherein each of the prismatic structures has a first facet and a second facet, the first facet and the second facet intersect to form a vertex angle, and the vertex angle is 60°-80°;
• and
• a first light source module and a second light source module adapted to be activated alternatively at a frequency, wherein:
• the second incident surface of the second light guide plate is located on the second side, the first light source module is disposed aside the first incident surface, and is adapted to be activated and provide a first light ray;
• the first light ray passes through the first light guide plate, the second light guide plate, and the reverse prism sheet and is emitted;
• the second light source module is disposed aside the second incident surface, and is adapted to be activated and provide a second light ray;
• the second light ray passes through the second light guide plate and the reverse prism sheet, and is emitted;
• wherein an output angle of the first light ray from the reverse prism sheet and an output angle of the second light ray from the reverse prism sheet are respectively between 0.5° and 20° and the first light source module and the second light source module are adapted to be activated alternatively at a frequency;
• and
• a display panel, disposed on the backlight module.