Anti-peep light source module and anti-peep display device

An anti-peep display device, configured to be switched between an anti-peep display mode and a normal display mode, and the anti-peep display device comprising:

• a display module, configured to provide a display light beam;
• and
• an anti-peep light source module, disposed on a transmission path of the display light beam, and the anti-peep light source module comprising:
• a light guide plate, having a first light incident surface, a second light incident surface and a first surface, wherein the first light incident surface and the second light incident surface are opposite to each other, the first surface connects the first light incident surface and the second light incident surface, and the light guide plate has a first region and a second region, the first region is closer to the first light incident surface than the second region, and the second region is closer to the second light incident surface than the first region;
• a first light emitting element, facing the first light incident surface for providing a first light beam, and the first light beam entering the light guide plate through the first light incident surface;
• a second light emitting element, facing the second light incident surface for providing a second light beam, and the second light beam entering the light guide plate through the second light incident surface;
• and
• a plurality of optical microstructures, disposed on the first surface, wherein each of the plurality of optical microstructures has a first optical surface and a second optical surface, the first optical surface faces the first light incident surface, and the second optical surface faces the second light incident surface, and the first optical surface is located between the first light incident surface and the second optical surface, wherein there is a first included angle between the first optical surface of each of the plurality of optical microstructures and the first surface, there is a second included angle between the second optical surface and the first surface, and a magnitude of the first included angle and a magnitude of the second included angle gradually change as getting farther away from the first surface.