Abstract: A polarized light source comprises a light emitting source and a polarization conversion device. The polarization conversion device comprises a fixing device (107), and a transparent moveable carrier (104) having motion state with respect to the fixing device (107) and provided with light wavelength conversion material (103). The polarization conversion device further comprises a stationary polarization beam splitter (101) close to the moveable carrier for transmitting a portion of excited light from the light wavelength conversion material (103) to provide a polarized emitted light and reflecting the other portion back to the light wavelength conversion material (103). A filter (102) for reflecting the excited light and transmitting the light from the light emitting source can be disposed at the side of the moveable carrier opposite to the polarization beam splitter (101).