COLOR SPLITTING/MIXING SYSTEM

摘要

PURPOSE: A color splitting/mixing system is provided to allow an input beam and an output beam of the color splitting/mixing system to have correlation of 90 degrees to produce a compact projection lens unit. CONSTITUTION: The first green color select retarder stack(GR1) converts a green component of beam into S-wave. The first PBS(P1) reflects the green component and transmits red and blue components. The green component reflected by the first PBS is filtered while passing a polarizer(PR) to becomes pure S-wave. The green component is reflected by the third PBS(P3) to be inputted into an LCD(15G) to be changed into P-wave. The second green color select retarder stack(GR2) converts the green component into S-wave. The green component is reflected by the fourth PBS(P4) to be transmitted to a projection system(16). A red color select retarder stack(RR) converts the red component into S-wave. The red component is reflected by the second PBS(P2) to be inputted into an LCD(15R) to be converted into P-wave. The red component goes to the projection system, being in P-wave state. The blue component transmits the first PBS and the third PBS to be inputted into an LCD(15B) to be converted into S-wave. A blue color select retarder stack(BR) changes the S-wave of the blue component into P-wave.