Display apparatus
First Claim
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;
(d) a reflective liquid crystal device for selectively modulating said polarized beam of light having a first polarization to encode image data thereon in order to form a modulated beam, and for reflecting 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 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 oblique and skew rays of said wire grid polarization beamsplitter relative to said wire grid polarization analyzer and said wire grid pre-polarizer; and
(h) image-forming optics for forming an image from said compensated modulated beam.
2 Assignments
0 Petitions
Accused Products
Abstract
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).
48 Citations
5 Claims
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1. A display apparatus comprising:
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(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;
(d) a reflective liquid crystal device for selectively modulating said polarized beam of light having a first polarization to encode image data thereon in order to form a modulated beam, and for reflecting 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 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 oblique and skew rays of said wire grid polarization beamsplitter relative to said wire grid polarization analyzer and said wire grid pre-polarizer; and
(h) image-forming optics for forming an image from said compensated modulated beam. - View Dependent Claims (2, 3, 4, 5)
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Specification