Patent ID: 6954245
Filing Date: 2005-10-11
Classification: G02B,G02F,H04N

Abstract:
1. A display apparatus comprising: (a) a light source for forming a beam of light; (b) a wire grid pre-polarizer for polarizing said beam of light to provide a polarized beam of light; (c) a wire grid polarization beamsplitter for receiving said polarized beam of light, for transmitting said polarized beam of light having a first polarization, and for reflecting said polarized beam of light having a second polarization, wherein sub-wavelength wires on said wire grid polarization beanisplitter face a reflective liquid crystal device; (d) wherein said e reflective liquid crystal device selectively modulates said polarized beam of light having a first polarization to encode image data thereon in order to form a modulated beam, and then reflects said modulated beam back to said wire grid polarization beamsplitter; (e) a first compensator located between said wire grid polarization beamsplitter and said reflective liquid crystal device, for conditioning the polarization states of oblique and skew rays of said modulated beam to provide a compensated modulated beam; (f) a wire grid polarization analyzer which removes residual light of the opposite polarization; (g) a second compensator for conditioning the polarization states of oblique and skew rays of said wire grid polarization beamsplitter relative to said wire grid polarization analyzer or said wire grid pre-polarizer; (h) image-forming optics for forming an image from said compensated modulated beam; and wherein said first compensator and said second compensator each comprise one or more birefringent layers, wherein said birefringent layers comprise at least one of the following; an A-plate film, a C-plate film, or a biaxial film.