Patent ID: 8919967
Filing Date: 2014-12-30
Classification: G02B,G03B

Abstract:
1. A micro projection system, comprising at least: a primary prism, which has a bottom face and two slope faces; a wedge prism group, which comprises at least a first wedge prism and a second wedge prism, which are stacked on one of the slope faces of the primary prism, coating layers being respectively formed between the primary prism and the first wedge prism, between the first and second wedge prisms, and on an outside surface of the second wedge prism to selectively reflects or transmits specific lights therethrough; a polarization beam splitting wedge prism, which is arranged on the other one of the slope surfaces of the primary prism, a polarization beam splitting film layer being formed between said the other one of the slope faces of the primary prism and the polarization beam splitting wedge prism, a reflective layer being formed on an outside surface of the polarization beam splitting wedge prism; a light source module and a collimation lens, which are arranged outside the bottom face of the primary prism corresponding to a portion of the bottom face that is opposite to the wedge prism group, the light source module comprising single-color light sources of at least red, green, and blue lights, which are allowed to transmit through the collimation lens to get into the primary prism; a lens array, which has two ends respectively forming a plurality of closely arranged lens units; and a polarization conversion film, which is arranged under lower lens units of the lens array, the polarization conversion film having a surface provided with a plurality of spaced phase retarding stripes thereby forming polarization conversion zones having the property of phase retardation and light transparent zone inducing no phase change.