Claims
- 1. An optical engine comprising:
a color wheel to alternatively derive at least two separate composite lights; a dichroic device to sequentially separate said at least two composite lights into a first color path and a second color path; an optical retarder to modify a polarization state for one of said first and second color paths; and a color combiner for receiving a first and a second beams of light projected from said first and second light path respectively to reconstitute a combined beam of light comprising two different colors with mutually orthogonal polarization states.
- 2. The optical engine of claim 1 further comprising:
a polarizing beam splitter (PBS) for receiving and splitting said combined beam according to a polarization state for projecting to two microdisplay panels.
- 3. The optical engine of claim 1 wherein:
said color wheel further drives two composite lights comprising a yellow light and a magenta light.
- 4. The optical engine of claim 1 wherein:
said dichroic device separating said composite lights into a red path and a green-or-blue path.
- 5. The optical engine of claim 2 further comprising:
a projection lens to receive and project light from the polarizing beamsplitter.
- 6. The optical engine of claim 1 wherein:
said optical retarder to modify a polarization state for one of said first and second color paths further comprising a half-wave optical retarder for changing a polarization by ninety degrees.
- 7. The optical engine of claim 1 further comprising:
a linear polarizer disposed right after said optical retarder in one of said first and second color paths.
- 8. The optical engine of claim 5 further comprising:
a linear polarizer disposed between said polarization beam splitter and said projection lens for preventing a transmission of selected beam of specific color and specific polarization.
- 9. The optical engine of claim 5 further comprising:
a linear polarizer disposed between said polarization beam splitter and said projection lens for preventing a transmission of a red color beam of a p-polarization.
- 10. The optical engine of claim 2 further comprising:
a quarter wave plate retarder disposed between at least one of said microdisplay panels and said polarizing beam splitter (PBS).
- 11. An optical subsystem to separate color paths of a color-composite light comprising:
a dichroic device to separate said color-composite light into a first color path and a second color path; and an optical retarder to modify a polarization state for one of said first and second color paths whereby said lights of transmitted over said first and second light path may be recombined and processed by a polarization beam splitter (PBS).
- 12. The optical subsystem of claim 11 wherein:
said optical retarder further comprising a half-wave retarder to modify a ninety-degrees polarization state between light beams transmitted along said first and second color paths.
- 13. The optical subsystem of claim 1 further comprising:
a color combiner for receiving light beams transmitted along said first and a second color paths to reconstitute a combined beam of light comprising two different colors with mutually orthogonal polarization states.
- 14. The optical subsystem of claim 13 further comprising:
a polarizing beam splitter (PBS) for receiving and splitting said combined beam according to a polarization state for projecting to two microdisplay panels.
- 15. The optical subsystem of claim 11 wherein:
said dichroic device further separating said composite light into a red path and a green-or-blue path.
- 16. The optical subsystem of claim 11 further comprising:
a linear polarizer disposed right after said optical retarder in one of said first and second color paths.
- 17. A method for configuring an optical engine comprising:
driving at least two separate composite lights; sequentially separating said at least two composite lights into a first color path and a second color path with; employing an optical retarder to modify a polarization state for one of said first and second color paths; and receiving a first and a second beams of light projected from said first and second light path respectively to reconstitute a combined beam of light comprising two different colors with mutually orthogonal polarization states.
- 18. The method of claim 17 further comprising:
employing a polarizing beam splitter (PBS) for receiving and splitting said combined beam according to a polarization state for projecting to two microdisplay panels.
- 19. The method of claim 17 wherein:
said step of driving said two composite lights further comprising a step of employing a color wheel for driving a yellow light and a magenta light.
- 20. The method of claim 17 wherein:
said step of separating said composite lights further comprising a step of employing a dichroic device for separating said composite lights into a red path and a green-or-blue path.
- 21. The method of claim 18 further comprising:
receive and projecting a beam of light from said polarizing beamsplitter (PBS).
- 22. The method of claim 17 wherein:
said step of employing said optical retarder to modify a polarization state for one of said first and second color paths further comprising a step of employing a half-wave optical retarder for changing a polarization by ninety degrees.
- 23. The method of claim 17 further comprising:
disposing a linear polarizer right after said optical retarder in one of said first and second color paths.
- 24. The method of claim 21 further comprising:
disposing a linear polarizer between said polarization beam splitter and a projection lens for preventing a transmission of selected beam of specific color and specific polarization.
- 25. The method of claim 21 further comprising:
disposing a linear polarizer disposed between said polarization beam splitter and a projection lens for preventing a transmission of a red color beam of a p-polarization.
- 26. The method of claim 16 further comprising:
disposing a quarter wave plate retarder between at least one of said microdisplay panels and said polarizing beam splitter (PBS).
Parent Case Info
[0001] This Application is a Formal Application and claim a Priority Date of Nov. 5, 2002 benefited from a Provisional Patent Application 60/424,213 file by one common inventor of this Patent Application.
Provisional Applications (1)
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Number |
Date |
Country |
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60424213 |
Nov 2002 |
US |