| 摘要 |
A projection display apparatus ( 10 ) uses a modulation optical system ( 200 ) that includes a liquid crystal device ( 210 ) in combination with a wire grid polarization beamsplitter ( 240 ), a wire grid polarization analyzer ( 270 ) and a projection lens ( 285 ) to form an image. In order to achieve high contrast and maintain high brightness levels, a compensator ( 260 ) is provided for minimizing leakage light for pixels in the black (OFF) state. A number of configurations are possible, such as with the compensator ( 260 ) disposed in the optical path between the liquid crystal device ( 210 ) and the wire grid polarization beamsplitter ( 240 ) and with a secondary compensator ( 265 ) disposed between wire grid polarization analyzer ( 270 ) and the wire grid polarization beamsplitter ( 240 ).
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