filters 40 a 40 b and 40 c but may additionally include them herein a detailed explanation as to elements of the optical system of fig4 identical to the optical system shown in fig2 will be omitted first and second fel 39 s 32 a and 32 b a pbs array 34 and first and second condensing lenses 36 a and 36 b allow a white light from the light source 30 to be uniformly and efficiently irradiated onto red green and blue lcd panels 46 r 46 g and 46 b the full reflecting mirror 52 full reflects an incident light from the first condensing lens 36 a to progress it toward the second condensing lens 36 b a first dichroic mirror 38 a reflects a s polarized light at the blue color area and allows it to be irradiated via a third condensing lens 36 c and a first pbsp 44 a onto the blue lcd panel 46 b further the first dichroic mirror 38 a transmits s polarized lights at the red and green color area having a larger wavelength than a light at the blue color area and allows them to be incident to the red and green lcd panels 46 r and 46 g via a first color selector 42 a a fourth condensing lens 36 d and a second pbsp 44 a the first color selector 42 a rotates a s polarized light at the blue area at 90 u00b0 as mentioned above to convert it into a p polarized light thereby allowing it to be transmitted to the second pbsp 44 b and to be incident to the red lcd panel 46 r.