Non-collinear light engine for color imaging systems
First Claim
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1. An apparatus comprising:
- a light engine having an output axis in a first orientation to provide a light source for said apparatus having at least two or more panels, wherein said light engine includes a polarization beam splitter and at least two light ports to dump undesirable light from said polarization beam splitter out of said apparatus; and
an imaging kernel optically couplable to the light engine to project a display based on an image data, said imaging kernel having an input axis in a second orientation substantially non-collinear to the first orientation.
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Abstract
For use with a color imaging system, a projection light engine may be configured in a way such that an output axis of the projection light engine may be in a non-collinear relationship with an input axis of an imaging kernel that provides image data processing to project a display. Undesired polarizations and colors may be dumped out of a critical optical path, using at least two or more ports. As a result, filters and other optical components may be optimized, significantly improving contrast ratios in a projection display system including a color imaging system with at least two panels.
25 Citations
27 Claims
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1. An apparatus comprising:
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a light engine having an output axis in a first orientation to provide a light source for said apparatus having at least two or more panels, wherein said light engine includes a polarization beam splitter and at least two light ports to dump undesirable light from said polarization beam splitter out of said apparatus; and
an imaging kernel optically couplable to the light engine to project a display based on an image data, said imaging kernel having an input axis in a second orientation substantially non-collinear to the first orientation. - View Dependent Claims (2)
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3. An apparatus comprising:
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a light engine having an output axis in a first orientation to provide a light source for said apparatus having at least two or more panels, wherein said light engine includes at least two light ports to dump undesirable light out of said apparatus; and
an imaging kernel optically couplable to the light engine to project a display based on an image data, said imaging kernel having an input axis in a second orientation substantially non-collinear to the first orientation, wherein the imaging kernel includes a first and a second spatial light modulator coupled to a polarization beam splitter. - View Dependent Claims (4)
a polarizer coupled in the output axis of the light engine to receive from the light engine said light source in a red, green, and blue light color format.
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5. An apparatus comprising:
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a light engine having an output axis in a first orientation to provide a light source for said apparatus having at least two or more panels, wherein said light engine includes at least two light ports to dump undesirable light out of said apparatus;
an imaging kernel optically couplable to the light engine to project a display based on an image data, said imaging kernel having an input axis in a second orientation substantially non-collinear to the first orientation; and
a color switch coupled to the light engine to provide phase switching of at least one of red, green and blue light of the red, green, and blue light color format based on an arrangement of one or more filters.
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6. An apparatus comprising:
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a light engine having an output axis in a first orientation, said light engine including a light source for said apparatus having at least two or more panels, wherein the light engine includes at least two ports to dump undesirable light out of said apparatus;
a first polarization beam splitter coupled in the output axis to receive a light beam from the light source;
a color switch coupled to receive light reflected by the input polarization beam splitter;
a turn-around polarizer coupled to reflect light incident from the color switch back to the color switch; and
an imaging kernel having an input axis in a second orientation in a substantially non-collinear relationship with the first orientation, said imaging kernel including, a second polarization beam splitter having a first, a second, a third, and a fourth side coupled to receive light from the light engine through the first side, and a first spatial light modulator coupled to one of the second and third sides, wherein the imaging kernel to provide a content-modulated output beam through the fourth side. - View Dependent Claims (7, 8, 9)
a second spatial light modulator coupled to another of the second and third sides.
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8. The apparatus of claim 7 wherein the light engine further includes:
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a light pipe homogenizer; and
a lens.
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9. The apparatus of claim 6 wherein the imaging kernel further includes:
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a filter disposed between the first side of the second polarization beam splitter and the first polarization beam splitter;
a first quarter-wave retarder disposed between the second polarization beam splitter and the first spatial light modulator; and
a filter and a projection lens disposed in a path of the content-modulated output beam.
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10. A color imaging system comprising:
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a light pipe homogenizer located in a first axis to receive light from a light source;
a lens disposed in the first axis after the light pipe homogenizer;
an input polarization beam splitter disposed in the first axis after the lens;
a first dump port oriented in the first axis after the input polarization beam splitter for dumping light of a first polarization;
a color switch coupled to receive light of a second polarization from the input polarization beam splitter in the first axis;
a first quarter-wave retarder coupled to receive light from the color switch in the first axis;
a turn-around polarizer coupled to receive light from and reflect light back through the first quarter-wave retarder and the color switch in the first axis;
a polarization beam splitter having a first side perpendicular to a second axis, wherein the second axis is in a different orientation than the first axis;
a second dump port oriented in the second axis after the turn-around polarizer;
a second quarter-wave retarder and a first spatial light modulator coupled to one of a second side and a third side of the polarization beam splitter; and
an output port located at a fourth side of the polarization beam splitter. - View Dependent Claims (11, 12, 13, 14, 15, 16)
a fourth quarter-wave retarder and a second spatial light modulator coupled to another of the second side and the third side of the polarization beam splitter.
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14. The color imaging system of claim 12 wherein the color switch switches at least one of blue and green light and the first spatial light modulator comprises a blue/green spatial light modulator.
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15. The color imaging system of claim 14, wherein the color switch switches blue, red, and green light and the first spatial light modulator comprises a blue/red/green spatial light modulator.
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16. The color imaging system of claim 14, wherein the color switch passes red light and the apparatus further comprises:
a fourth quarter-wave retarder and a second spatial light modulator coupled to another of the second side and the third side of the polarization beam splitter.
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17. A method comprising:
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receiving a light beam from a light engine having an output axis of a first orientation in a panel-based color imaging system to project a display based on an image data directing the light beam to a polarization beam splitter to dump undesirable light from one of at least two available dump ports of the panel-based color imaging system; and
providing a color switch in a second orientation for an imaging kernel having an input axis collinear with the second orientation, wherein the first and second orientations are in a substantially non-collinear relationship. - View Dependent Claims (18, 19)
creating a path to remove at least one of green and blue light from the optical circuit based on an incorrect polarization; and
reducing leakage of the at least one of green and blue light to increase contrast ratio.
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20. A method comprising:
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configuring a light engine in a first orientation for a color imaging system having at least two or more panels with at least two light dump ports to dump undesirable light out of said color imaging system; and
optically coupling to the light engine a color switch in a second orientation being in a non-collinear relationship with the first orientation to project a display based on an image data. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27)
reducing at least one of green and blue light from the optical circuit based on an incorrect polarization; and
reducing leakage of the at least one of green and blue light.
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24. The method of claim 23 including providing an output beam onto the projection lens to form said display from the image data with a significantly increased contrast relative to a collinearly configured the first and second orientations.
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25. The method of claim 20 including configuring the color switch to cause a light beam to pass at least twice therethrbugh.
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26. The method of claim 20 including providing a polarizer in the optical circuit that performs both a pre-polarization before the color switch and a clean-up polarization after the color switch of the light beam.
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27. The method of claim 20 including providing independent optimization of a color polarization filter, an imaging pre-filter and an imaging post-filter by reducing leakage of at least one of green and blue light.
Specification