Claims
- 1. An optical system comprising:
(a) a light modulating panel; (b) a projection lens for forming an image of the light modulating panel, said projection lens having a depth of focus D in imager space; and (c) a tilted polarization splitter located between the light modulating panel and the projection lens, said polarization splitter comprising a substrate having a thickness T such that the astigmatism introduced by the substrate at its tilted angle is less than or equal to D.
- 2. The optical system of claim 1 wherein D is approximately 0.05 millimeters.
- 3. The optical system of claim 1 wherein T is approximately 0.15 millimeters.
- 4. The optical system of claim 1 wherein the polarization splitter is tilted at an angle of approximately 45°.
- 5. The optical system of claim 1 wherein the polarization splitter is a wire grid polarizer.
- 6. The optical system of claim 1 wherein the polarization splitter comprises a polarization coating.
- 7. The optical system of claim 1 wherein the polarization splitter comprises a polarizing birefringence film.
- 8. The optical system of claim 1 wherein the light modulating panel is a reflective liquid crystal display.
- 9. The optical system of claim 1 wherein the light modulating panel is a liquid crystal on silicon panel.
- 10. An optical system comprising:
(a) an illumination system; (b) a light modulating panel; (c) a projection lens for forming an image of the light modulating panel, said projection lens having a depth of focus D in imager space; and (d) a tilted polarization splitter located between the illumination system and the light modulating panel and between the light modulating panel and the projection lens, said polarization splitter comprising a substrate having a thickness T such that the astigmatism introduced by the substrate at its tilted angle is less than or equal to D.
- 11. The optical system of claim 10 wherein D is approximately 0.05 millimeters.
- 12. The optical system of claim 10 wherein T is approximately 0.15 millimeters.
- 13. The optical system of claim 10 wherein the polarization splitter is tilted at an angle of approximately 45°.
- 14. The optical system of claim 10 wherein the polarization splitter is a wire grid polarizer.
- 15. The optical system of claim 10 wherein the polarization splitter comprises a polarization coating.
- 16. The optical system of claim 10 wherein the polarization splitter comprises a polarizing birefringence film.
- 17. The optical system of claim 10 wherein the light modulating panel is a reflective liquid crystal display.
- 18. The optical system of claim 10 wherein the light modulating panel is a liquid crystal on silicon panel.
- 19. The optical system of claim 10 further comprising a polarizer between the illumination system and the polarization splitter.
- 20. A polarization splitter comprising a substrate whose thickness is less than or equal to 0.15 millimeters.
- 21. The polarization splitter of claim 20 wherein the splitter is a wire grid polarizer.
Priority Claims (1)
Number |
Date |
Country |
Kind |
60245360 |
Nov 2000 |
US |
|
CROSS REFERENCE TO RELATED PROVISIONAL APPLICATION
[0001] This application claims the benefit under 35 USC §119(e) of U.S. Provisional Application No. 60/292,178, filed May 18, 2001, the contents of which are incorporated herein in their entirety.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
PCT/US01/50674 |
11/1/2001 |
WO |
|