Image projection apparatus and its optical polarization module

The present invention is related to a kind of image projection apparatus that uses converging light source. In the invention, S-polarized light is reflected through a metal grating polarizer plate to form the first light beam, and the P-polarized light in the incident light beam is transmitted. A planar mirror is stacked adjacent to the metal grating polarizer plate to form a predetermined acute angle with the polarization beam splitter plate for reflecting P-polarized light to transmit the metal grating polarizer plate to form the second light beam. The first lens array is coupled with the first light beam and the second light beam, so that the P-polarized light in the second light beam is refracted and passes through the half-wavelength plate disposed on the second lens array, so as to be modulated modulate it into the S-polarized light, such that the converging light beam passing through the second lens array becomes S-polarizied. After that, based on the inputted image signal, image is displayed by using