Light source assembly, method for manufacturing same, and projection device

A projection device, comprising:

• a light source assembly and a light modulation assembly, wherein
• the light modulation assembly is configured to modulate a light beam from the light source assembly into an image light beam, and project the image light beam;
• and
• the light source assembly comprises a base, a light source, and a polarization beam-splitting layer, wherein
• the light source is configured to emit a first light beam, the first light beam comprising a light beam in a first polarization direction and a light beam in a second polarization direction;
• the polarization beam-splitting layer is disposed on a light-emitting side of the light source and is configured to reflect a light beam that meets a first condition to the light source, and transmit a light beam that does not meet the first condition, wherein the first condition comprises an incident angle being greater than or equal to an angle threshold, and a polarization direction being the second polarization direction;
• the light source is further configured to emit a second light beam based on the light beam in the second polarization direction reflected by the polarization beam-splitting layer, the second light beam comprising a light beam in the first polarization direction and a light beam in the second polarization direction;
• and
• the base is disposed on a backlight side of the light source and outside a transmission path of a light beam between the light source and the polarization beam-splitting layer, and the base is connected to the light source and the polarization beam-splitting layer.