Three dimensional image projector with circular light polarization
First Claim
1. A method comprising:
- providing a light source having a light emitting diode (LED) that emits a light;
providing a polarization conversion system (PCS) adjacent the LED comprising a linear polarizer and a wave plate, the linear polarizer having an axis of polarization and the wave plate being rotatable between a first and second position about an optic axis of the LED;
providing a polarizing beam splitter (PBS) adjacent the light source;
providing an imaging device adjacent the PBS;
rotating the wave plate of the PCS to a first position;
emitting a first light from the light source when the wave plate of the PCS is in the first position;
converting, at the PCS, the first light to circular polarization;
reflecting the first light with the PBS onto the imaging device;
rotating the wave plate of the PCS to a second position, the second position being 90 degrees apart from the first position;
emitting a second light from the light source when the wave plate is in the second position;
converting the second light to circular polarization; and
,reflecting the second light with the PBS onto the imaging device subsequent to reflecting the first light onto the imaging device.
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Accused Products
Abstract
A method is provided that includes providing a light source having a light emitting diode (LED) that emits a light. A polarization conversion system (PCS) is located adjacent the LED and has both a linear polarizer and a wave plate. A polarizing beam splitter (PBS) is adjacent the light source and an imaging device is adjacent the PBS. The wave plate of the PCS is rotated to a first position, and a first light is emitted by the LED in the first light source. This first light is converted to circular polarization. This first light travels to the PBS where it is reflected onto the imaging device. The wave plate is then rotated to a second position, and a second light is emitted by the light source. This second light is converted to circular polarization and reflects from the PBS onto the imaging device.
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Citations
16 Claims
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1. A method comprising:
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providing a light source having a light emitting diode (LED) that emits a light; providing a polarization conversion system (PCS) adjacent the LED comprising a linear polarizer and a wave plate, the linear polarizer having an axis of polarization and the wave plate being rotatable between a first and second position about an optic axis of the LED; providing a polarizing beam splitter (PBS) adjacent the light source; providing an imaging device adjacent the PBS; rotating the wave plate of the PCS to a first position; emitting a first light from the light source when the wave plate of the PCS is in the first position; converting, at the PCS, the first light to circular polarization; reflecting the first light with the PBS onto the imaging device; rotating the wave plate of the PCS to a second position, the second position being 90 degrees apart from the first position; emitting a second light from the light source when the wave plate is in the second position; converting the second light to circular polarization; and
,reflecting the second light with the PBS onto the imaging device subsequent to reflecting the first light onto the imaging device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method comprising:
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providing a light source having a light emitting diode (LED) that emits a light; providing a polarization conversion system (PCS) adjacent the LED comprising a linear polarizer and a wave plate, the linear polarizer having an axis of polarization and the wave plate being rotatable about an optic axis of the LED; providing a polarizing beam splitter (PBS) adjacent the light source; providing an imaging device adjacent the PBS; oscillating the wave plate of the PCS between a first position and a second position, the first position being 90 degrees apart from the second position; emitting a sequence of light emissions from the LED; synchronizing the emitting of the light emissions with the oscillating of the wave plate of the PCS, wherein the wave plate of the PCS is oriented in either the first position or second position when light is emitted; and creating alternating emissions of light having left-handed circular polarization and right-handed circular polarization in response to the sequence of light emissions and the oscillating of the wave plate of the PCS. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification