Light source module and projection device

A projection device, wherein the projection device comprises a light source module, an optical engine module, a heat dissipation module, and a projection lens, wherein

• the light source module comprises a light emitting unit, a carrier, and a noise reduction unit, wherein
• the light emitting unit comprises at least one light source and a circuit board, the at least one light source is disposed on the circuit board and the at least one light source is configured for providing a lighting beam, wherein the circuit board has a first surface and a second surface which are opposite to each other, the at least one light source is disposed on the first surface, the first surface faces the carrier, and a light emission direction of the at least one light source is a direction from the second surface to the first surface;
• the carrier is configured for fixing the light emitting unit and the carrier has an opening, and the at least one light source of the light emitting unit is aligned with the opening;
• and
• the noise reduction unit is configured to be attached to the second surface of the circuit board, or the noise reduction unit comprises a first side, a second side and a third side, and the circuit board is disposed in an area surrounded by the first side, the second side and the third side of the noise reduction unit;
• the optical engine module comprises a light valve, the light valve is located on a transmission path of the lighting beam and is configured for converting the lighting beam into an image beam;
• the light source module is located between the optical engine module and the heat dissipation module;
• and
• the projection lens is located on a transmission path of the image beam and is configured for projecting the image beam.