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US 2015/0316839 A1Published application
Light source unit, and image projection device including same
AssigneeLG Electronics Inc.
InventorsByungwoo JEOUNG, Yongwoo BAE, Kihyuk SONG, Sangok YEO
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Abstract
A light source unit includes a light source which emits a light bundle in one direction; a polarizing unit which is formed to selectively transmit a certain polarized light of a certain wavelength in the light bundle; and a reflection unit which is formed so as to delay the phase of the polarized light so that the polarized light is reflected by the polarizing unit, convert one part of the wavelength of the polarized light, and reflect the polarized light toward the polarizing unit.
Claims21
-14. (canceled)
A light source unit comprising:
- a light source configured to emit a pencil of blue lights in a first direction;
- a polarizer configured to selectively transmit a specific polarization light in the pencil of blue lights and to reflect a remaining light of the pencil of blue lights;
- a phase retarder configured to transmit the specific polarization light transmitted by the polarizer and retard a phase of the specific polarization light to thereby produce a first phase-retarded light;
- and
- a wavelength conversion wheel configured to receive the first phase-retarded light, convert a wavelength of the first phase-retarded light, and reflect a resulting wavelength-converted first phase-retarded light in a direction opposite to the first direction toward the phase retarder,
- wherein the phase retarder is configured to retard a phase of the wavelength-converted first phase-retarded light to thereby produce a second phase-retarded light.
3 more elements
An image projection apparatus comprising:
- a body that makes up an external appearance;
- a light source unit arranged within the body and that emits a pencil of rays;
- and
- an image formation unit configured form an image using the pencil of rays,
- wherein the light source unit includes:
- a light source configured to emit a pencil of blue lights in a first direction;
- a polarizer configured to selectively transmit a specific polarization light in the pencil of blue lights and to reflect a remaining light of the pencil of blue lights;
- a phase retarder configured to transmit the specific polarization light transmitted by the polarizer and retard a phase of the specific polarization light to thereby produce a first phase-retarded light;
- and
- a wavelength conversion wheel configured to receive the first phase-retarded light, convert a wavelength of the first phase-retarded light, and reflect a resulting wavelength-converted first phase-retarded light in a direction opposite to the first direction toward the phase retarder,
- wherein the phase retarder is configured to retard a phase of the wavelength-converted first phase-retarded light to thereby produce a second phase-retarded light.
8 more elements
Dependencies are inferred from the claim text.