Light source module and projection device

A projection device, comprising an illumination system, suitable for providing an illumination beam, the projection device further comprising:

• a light source module, configured to provide a laser beam to form the illumination beam, comprising:
• a plurality of laser source units, wherein the laser source units comprise a first laser source unit, a second laser source unit, a third laser source unit and a fourth laser source unit, which are respectively configured to provide a first laser beam, a second laser beam, a third laser beam and a fourth laser beam;
• a first light combining unit, wherein the first light combining unit has a first reflection region and a first transmission region;
• a second light combining unit, wherein the second light combining unit has a second reflection region and a second transmission region;
• and
• a focusing lens, located on transmission paths of the first laser beam, the second laser beam, the third laser beam and the fourth laser beam, wherein
• the first laser beam, the second laser beam, the third laser beam and the fourth laser beam are respectively incident on the focusing lens along a first direction,
• the first laser source unit and the second laser source unit are arranged along a second direction,
• when viewed along a third direction, the first laser source unit and the second laser source unit do not overlap,
• when viewed along the second direction, the first laser source unit and the second laser source unit are displaced up and down, and the first laser source unit and the second laser source unit are partially overlapped, and
• the first direction, the second direction, and the third direction are perpendicular to one another;
• a light valve, disposed on a transmission path of the illumination beam and configured to convert the illumination beam into an image beam;
• and
• a projection lens, disposed on a transmission path of the image beam and configured to project the image beam out of the projection device.