Multi-Primary LED Projection System
First Claim
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1. A projection system comprising:
- a first color channel that produces light having a first color, the first color channel comprising;
a first light emitting diode that produces light having a first range of wavelengths and a second light emitting diode that produces light have a second range of wavelengths, the second range of wavelengths being different than the first range of wavelengths;
a beam combining element positioned to receive the light having the first range of wavelengths and the light having the second range of wavelengths, the beam combining element combining the light having the first range of wavelength and the light having the second range of wavelengths to produce the light having the first color;
a second color channel that produces light having a second color, the second color being different than the first color, the second color channel having at least one light emitting diode that produces light having a third range of wavelengths, the third range of wavelengths is different than the first range of wavelengths and the second range of wavelengths, wherein the light having the second color comprises the light having the third first range of wavelengths;
a first microdisplay positioned to receive and affect at least the light having the first range of wavelengths;
a second microdisplay positioned to receive and affect at least the light having the third range of wavelengths; and
a polarization based dichroic element positioned to receive the light having the first color from the first color channel and the light having the second color from the second color channel, the polarization based dichroic element configured to combine the light having the first color and the light having the second color after the light having the first range of wavelengths is affected by the first microdisplay and the light having the third range of wavelengths is affected by the second microdisplay.
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Abstract
A multi-primary light emitting diode system includes the use of a polarization based dichroic element to combine light from different color channels. At least one of the color channels includes two light emitting diodes that produce light with a different range of wavelengths. The use of the polarization based dichroic element permits overlapping spectra from different color channels to be combined without loss. Accordingly, the brightness of the system is improved relative to conventional systems in which losses occur when combining overlapping spectra from different channels.
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Citations
24 Claims
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1. A projection system comprising:
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a first color channel that produces light having a first color, the first color channel comprising; a first light emitting diode that produces light having a first range of wavelengths and a second light emitting diode that produces light have a second range of wavelengths, the second range of wavelengths being different than the first range of wavelengths; a beam combining element positioned to receive the light having the first range of wavelengths and the light having the second range of wavelengths, the beam combining element combining the light having the first range of wavelength and the light having the second range of wavelengths to produce the light having the first color; a second color channel that produces light having a second color, the second color being different than the first color, the second color channel having at least one light emitting diode that produces light having a third range of wavelengths, the third range of wavelengths is different than the first range of wavelengths and the second range of wavelengths, wherein the light having the second color comprises the light having the third first range of wavelengths; a first microdisplay positioned to receive and affect at least the light having the first range of wavelengths; a second microdisplay positioned to receive and affect at least the light having the third range of wavelengths; and a polarization based dichroic element positioned to receive the light having the first color from the first color channel and the light having the second color from the second color channel, the polarization based dichroic element configured to combine the light having the first color and the light having the second color after the light having the first range of wavelengths is affected by the first microdisplay and the light having the third range of wavelengths is affected by the second microdisplay. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method comprising:
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producing light having a first color in a first color channel, wherein producing light having the first color in the first color channel comprises; generating light with a first range of wavelengths; generating light with a second range of wavelengths, the second range of wavelengths being different than the first range of wavelengths; combining the light with the first range of wavelengths with the light having the second range of wavelengths; producing light having a second color in a second color channel, the second color being different than the first color; providing image information in the first color in the first color channel; providing image information in the second color in the second color channel; and combining the light having the first color from the first color channel with the light having the second color from the second color channel based on the polarization states of the light in the first color channel and the light in the second color channel. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification