| 摘要 |
<p>The invention relates to a projection device for projecting an image, comprising a light source ( 1 ), a LCD projection subsystem ( 3 ) and a projection means ( 4, 5 ) for projecting the image. A small-sized and low-cost projection device is porposed wherein said projection subsystem comprises: a waveguide integrator ( 30 ) for guiding light from an entrance ( 31 ) to an exit ( 34 ), the inner entrance surface ( 33 ) of said integrator ( 30 ) being coated with a reflective material and having a hole ( 32 ) for coupling light emitted from said light source ( 1 ) into said integrator ( 30 ), a reflective polarizer ( 35 ) provided at the exit surface ( 34 ) of said integrator ( 30 ) for reflecting light having the wrong polarization backinto said integrator ( 30 ), a transmissive LCD ( 36 ) provided at the exit of said reflective polarizer ( 35 ) for modulating the light transmitted by said polarizer ( 35 ), said LCD ( 36 ) having an integrated reflective color filter array ( 37 ) for reflecting light having the wrong color back into said integrator ( 30 ).</p> |
