Abstract: An optical path of a reflecting liquid crystal projector is having an incidence light and three dichroic cubes. A first dichroic cube has a first coating with a normal vector of (1,0,1). The first dichroic cube can split the incidence light into two directions, one direction that reflects the blue light and red light and another direction that transmits the green light. A second dichroic cube has a second coating with a normal vector of (1,1,0). In the second dichroic cube, the red light is reflected to a red liquid crystal display (LCD) panel, and the blue light is transmitted to a blue LCD panel. A third dichroic cube has a third coating with a normal vector of (1,0,1). In the third dichroic cube, the green light is transmitted to a green LCD panel.