Abstract: A micro projection device includes a light-emitting unit, a first lens unit, a reflective unit, a second lens unit, a prism unit, an image display unit and a projection unit. The light-emitting unit has three light-emitting modules. Each light-emitting module has a heat-dissipating element, a light-emitting element and a light-guiding element combined with the heat-dissipating element for receiving light beams generated by the light-emitting element. The first lens unit has three first lens sets respectively disposed beside the three light-emitting modules. The reflective unit is disposed beside the first lens unit. The second lens unit is disposed beside the reflective unit. The prism unit is disposed beside the second lens unit. The image display unit has a reflective image display panel disposed beside one side of the prism unit. The projection unit has a projection lens disposed beside another side of the prism unit.

Abstract: A projection system for simultaneously outputting image light source with different polarizations includes a polarizing beam splitting module, an image display module and an image projecting module. The polarizing beam splitting module has a first polarizing beam splitting element for receiving light source, a second polarizing beam splitting element, a third polarizing beam splitting element and a fourth polarizing beam splitting element. The image display module has a first reflective image display panel disposed beside the second polarizing beam splitting element and a second reflective image display panel disposed beside the third polarizing beam splitting element. The image projecting module has at least one projection lens disposed beside the fourth polarizing beam splitting element.

Abstract: A light combining/projecting system for outputting light beams of the same polarization includes a light-emitting module, a dichroic mirror, a reflective mirror module, a PBS module, an image-displaying module, and a light-combining module. The PBS module has a first, a second, and a third PBS respectively and integratedly arranged on three sides of the dichroic mirror. The image-displaying module has a first, a second, and a third image-displaying panel respectively arranged beside the first, the second, and the third PBS. The reflective mirror module has a first, a second, and a third reflective mirror under the first, the second, and the third PBS. The dichroic mirror is arranged at a corner position between the second and the third PBS. The light-combining module, the PBS module, the image-displaying module, the reflective mirror module, and the dichroic mirror are all mated together for generating light beams of the same polarization.