Reflective polarization valve engine and projection display using the same
First Claim
1. A light projector using reflective polarization valve, the light projector comprising:
- a light source providing a polarized white beam;
at least a dichroic mirror splitting the white beam into a plurality of color beams with different colors;
at least a reflective polarization valve receiving the polarized color beams and selectively reflecting the color beams;
at least a wire-grid polarizer located between the dichroic mirror and the reflective polarization valve, the wire-grid polarizer allowing the polarized color beams of one specific polarity to pass through and reflecting the polarized color beams of another specific polarity, the polarized color beams reflected from the reflective polarization valve under light state being reflected via the wire-grid polarizer for color recombining; and
a color-recombining unit combining the color beams reflected from the wire-grid polarizer.
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Accused Products
Abstract
Reflective polarization valve engine and projection display are disclosed. Instead of prism PBS, the projector applies wire-grid polarizers with advantages of higher heat-resistance, no limitation of the incident angle and no birefringence effects, to provide excellent contrast luminance. The light source in the projector utilizes an elliptical lamp under a telecentric optical system to achieve higher efficiency and avoid color gradient. In addition, the light paths are in special arrangement. The original beam is first splitted into RGB, and then proceeding with color-recombining right after being polarized via wire-grid polarizers and analyzed by reflective polarization valves. Hence, the analyzed beams finally are recombined images with superior performances.
161 Citations
21 Claims
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1. A light projector using reflective polarization valve, the light projector comprising:
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a light source providing a polarized white beam;
at least a dichroic mirror splitting the white beam into a plurality of color beams with different colors;
at least a reflective polarization valve receiving the polarized color beams and selectively reflecting the color beams;
at least a wire-grid polarizer located between the dichroic mirror and the reflective polarization valve, the wire-grid polarizer allowing the polarized color beams of one specific polarity to pass through and reflecting the polarized color beams of another specific polarity, the polarized color beams reflected from the reflective polarization valve under light state being reflected via the wire-grid polarizer for color recombining; and
a color-recombining unit combining the color beams reflected from the wire-grid polarizer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A projection display using reflective polarization valve, the projection display comprising:
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a light source providing a polarized white beam;
at least a dichroic mirror splitting the white beam into a plurality of color beams with different colors;
at least a reflective polarization valve receiving the polarized color beams and selectively reflecting the color beams;
at least a wire-grid polarizer located between the dichroic mirror and the reflective polarization valve, the wire-grid polarizer allowing the polarized color beams of one specific polarity to pass through and reflecting the polarized color beams of another specific polarity, the polarized color beams reflected from the reflective polarization valve under light state being reflected via the wire-grid polarizer for color recombining;
a color-recombining unit combining the color beams reflected from the wire-grid polarizer; and
a projecting unit projecting the combined color beams to form images. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification