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...http://www.google.com.au/patents/US7184115?utm_source=gb-gplus-sharePatent US7184115 - Display apparatus with two polarization compensators
