An integrator and a display apparatus using the same simplify the structure of
an optical system and minimize optical loss. The integrator homogenizes, polarizes
and recaptures incident lights. The optical loss can be reduced by using a color
drum and a color wheel engaged with the integrator. In order to minimize the optical
loss, a polarization conversion device where a color bar filter or color switch
is directly adhered to an integrator is used. The polarization conversion device
can be applied to a projector for embodying small images into large ones.
