Light source module

A light source module, comprising:

• a light guide plate, comprising a light exit surface, a bottom surface opposite to the light exit surface, and a light entrance surface connected to the light exit surface and the bottom surface;
• a light source, disposed beside the light entrance surface of the light guide plate, wherein the light source is adapted to emit a light beam to the light entrance surface;
• a first prism sheet, disposed on the light exit surface of the light guide plate and comprising a plurality of first prism units, wherein a surface of the first prism units faces away from the light exit surface;
• and
• a reflection sheet, disposed on the bottom surface of the light guide plate, wherein the light guide plate is located between the reflection sheet and the first prism sheet, the reflection sheet comprises a plurality of microstructures, and a surface of the microstructures faces the bottom surface of the light guide plate;
• wherein the reflection sheet further comprises a substrate, the substrate has a top surface facing the bottom surface, the microstructures are connected to the top surface, the surface of each one of the microstructures comprises a first slope surface adjacent to the light source and a second slope surface far away the light source, the first slope surface adjoins the second slope surface, a first included angle is between the first slope surface and the top surface, an angle of the first included angle is θ1, and 45 degrees≤θ1≤55 degrees;
• wherein the microstructures of the reflection sheet are adapted to reflect a portion of the light beam passing through the bottom surface to form a reflection light beam transmitted toward the light guide plate, the reflection light beam is emitted out from the light exit surface, an included angle is between the reflection light beam and a normal line of the light exit surface, an angle of the included angle is θ, and 30 degrees≤θ≤60 degrees.