Single lens stereographic projection device and optical filtering color block

The invention discloses a single-lens solid projecting device which comprises a light source and a filter wheel, a digital micro-mirror chip and a projection lens which are orderly arranged along the spreading direction of the light source. The filter wheel is used for periodically filtering three kinds of primary color lights of red, green and blue. The digital micro-mirror chip reflects the three kinds of primary colors to the projection lens to be imaged by the action of the projection lens. The filter wheel is provided with three polarization filtering units respectively corresponding to three kinds of primary color lights. Each polarization filtering unit comprises two polarization filtering plates with orthogonal polarization directions and generates unicolor polarized lights with different polarization states by turns. The invention also discloses a filter wheel which comprises three polarization filtering units respectively corresponding to the three kinds of primary colors of red, green and blue, and each polarization filtering unit comprises two polarization filtering plates with orthogonal polarization directions. Solid projection can be realized by one lens module according to the device which has the simple structure and the convenient use and is in favor of the miniaturization of a device.