US 11,693,300 B2
Illumination system and projection device
Min-Chang Chang, Hsin-Chu (TW)
Assigned to Coretronic Corporation, Hsin-Chu (TW)
Filed by Coretronic Corporation, Hsin-Chu (TW)
Filed on Nov. 18, 2021, as Appl. No. 17/529,264.
Claims priority of application No. 202011300214.2 (CN), filed on Nov. 19, 2020.
Prior Publication US 2022/0155662 A1, May 19, 2022
Int. Cl. G03B 21/20 (2006.01); G02B 27/28 (2006.01)
CPC G03B 21/204 (2013.01) [G02B 27/285 (2013.01); G03B 21/208 (2013.01); G03B 21/2066 (2013.01); G03B 21/2073 (2013.01)] 24 Claims
OG exemplary drawing
 
1. An illumination system, configured to provide an illumination beam, wherein the illumination system comprises a laser light source, a wavelength conversion module, and a polarization conversion unit, wherein
the laser light source is configured to provide a laser beam,
the wavelength conversion module has a wavelength conversion region, and the wavelength conversion module is deposed on a transmission path of the laser beam, wherein the laser beam is converted into a wavelength conversion beam by the wavelength conversion region, a part of the wavelength conversion beam has a first polarization state, and another part of the wavelength conversion beam has a second polarization state, and
the polarization conversion unit is located between the wavelength conversion module and the laser light source, wherein the polarization conversion unit has a plurality of first polarization conversion regions and a plurality of second polarization conversion regions, wherein the polarization conversion unit comprises a plurality of phase delay sheets correspondingly located on a plurality of surfaces facing the laser light source and located in the plurality of second polarization conversion regions of the polarization conversion unit, the wavelength conversion beam with the second polarization state leaves the polarization conversion unit after passing through a surface of the polarization conversion unit located in the plurality of first polarization conversion regions facing the laser light source, and the wavelength conversion beam with the first polarization state leaves the polarization conversion unit after passing through the phase delay sheet located in the second polarization conversion region.