Color field sequential projector including polarized light beam splitter and electronically controllable birefringence quarter waveplate
First Claim
Patent Images
1. A color field sequential projector comprising:
- a light source that provides light in a first waveband region and in a second waveband region, wherein said first waveband region is distinct from said second waveband region;
an electronically controllable quarter waveplate that receives said light from said light source, wherein said electronically controllable quarter waveplate is adapted for being electronically switched between a first state and a second state, wherein in said first state said waveplate defines a birefringent delay corresponding to one quarter of a wavelength of light in said first waveband region and in said second state said waveplate defines a birefringent delay corresponding to one quarter of a wavelength of light in said second waveband region; and
a reflection device that receives said light from said electronically controllable quarter waveplate.
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Abstract
A color field sequential projector includes an electronically controllable quarter waveplate positioned between a reflection device and a polarized light beam splitter, wherein the controllable quarter waveplate is switched to be optimum for particular wavebands as the illumination distribution changes during a color field sequence. The electronically controllable quarter waveplate provides for improved contrast performance and color purity in the projected image.
18 Citations
20 Claims
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1. A color field sequential projector comprising:
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a light source that provides light in a first waveband region and in a second waveband region, wherein said first waveband region is distinct from said second waveband region;
an electronically controllable quarter waveplate that receives said light from said light source, wherein said electronically controllable quarter waveplate is adapted for being electronically switched between a first state and a second state, wherein in said first state said waveplate defines a birefringent delay corresponding to one quarter of a wavelength of light in said first waveband region and in said second state said waveplate defines a birefringent delay corresponding to one quarter of a wavelength of light in said second waveband region; and
a reflection device that receives said light from said electronically controllable quarter waveplate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A color field sequential projector comprising:
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a light source that provides light in a first waveband region, a second waveband region, and a third waveband region, wherein said first, second and third waveband regions are each distinct from each other;
a first quarter waveplate that receives light from said light source in said first and second waveband regions, wherein said first quarter waveplate is adapted for being switched between a first state and a second state, and wherein in said first state said waveplate reduces depolarization of skew rays in said first waveband region and in said second state said waveplate reduces depolarization of skew rays in said second waveband region;
a second quarter waveplate that receives light from said light source in said third waveband region, wherein said second quarter waveplate reduces depolarization of skew rays in said third waveband region;
a first reflection device that receives said light from said first quarter waveplate; and
a second reflection device that receives said light from said second quarter waveplate. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A method of providing a multicolor image, comprising the steps of:
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sequentially providing light in a first waveband region and light in a second waveband region, wherein said first waveband region is distinct from said second waveband region;
providing an electronically controllable quarter waveplate that sequentially receives said light in said first and second waveband regions;
electronically switching said quarter waveplate between a first state and a second state, such that said quarter waveplate is in said first state when said quarter waveplate receives said light in said first waveband region and such that said quarter waveplate is in said second state when said quarter waveplate receives said light in said second waveband region, wherein in said first state said waveplate defines a phase retardation that increases a color purity of said first waveband region and in said second state said waveplate defines a phase retardation that increases a color purity of said second waveband region; and
providing a reflection device that sequentially receives said light in said first and second waveband regions from said electronically controllable quarter waveplate; and
providing a projection device that sequentially receives and thereafter sequentially projects said light in said first and second waveband regions reflected from said reflection device. - View Dependent Claims (19, 20)
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Specification