A waveguide polarization recovery system both polarizes the input light
energy for use with an LCD imager and converts the polarity of unusable
light energy to add to the illumination of the LCD imager. The compact
polarization recovery waveguide system generally includes: (1) an input
waveguide that provides non-polarized light energy into the system; (2)
an output waveguide that receives polarized light energy from the system;
(3) a polarized beam splitter that received the light energy from the
input waveguide and transmits light energy of a first polarization type
and reflects light energy of a second polarization type, and (4) a wave
plate that modifies the polarization of either the transmitted or
reflected light energy. The polarization recovery system also generally
includes one or more mirrors that are positioned as need to direct the
transmitted and the reflected light energy to the output waveguide. The
input and output waveguides may be shaped as needed by the projection
system. For example, either one or both of the input and output
waveguides may be tapered as needed to produce a desired image. In the
waveguide polarization recovery system, the input and output waveguides
are configured to have either an either a substantially parallel or a
substantially perpendicular orientation. In another embodiment, the
waveguide polarization recovery system further includes has one or more
"gaps" of optically clear material positioned between the optical
components to encourage the occurrence to total internal reflection that
minimizes the loss of the optical energy by the system.