US 12,238,461 B2
Laser projection apparatus
Youliang Tian, Qingdao (CN); Zinan Zhou, Qingdao (CN); Xin Zhang, Qingdao (CN); and Yunchen Lu, Qingdao (CN)
Assigned to HISENSE LASER DISPLAY CO., LTD, Quangdao (CN)
Filed by Hisense Laser Display Co., Ltd, Qingdao (CN)
Filed on Sep. 13, 2022, as Appl. No. 17/943,608.
Application 17/943,608 is a continuation of application No. PCT/CN2021/082139, filed on Mar. 22, 2021.
Claims priority of application No. 202010318957.6 (CN), filed on Apr. 21, 2020.
Prior Publication US 2023/0007218 A1, Jan. 5, 2023
Int. Cl. H04N 9/31 (2006.01); G03B 21/20 (2006.01)
CPC H04N 9/3161 (2013.01) [G03B 21/2066 (2013.01); H04N 9/3167 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A laser projection apparatus, comprising:
a laser source configured to emit illumination beams;
an optical engine configured to modulate the illumination beams emitted by the laser source, so as to obtain projection beams; and
a projection lens configured to project the projection beams into an image;
the laser source including:
a base plate;
a plurality of light-emitting components disposed on the base plate and configured to emit laser beams; and
a reflecting prism disposed on the base plate, the reflecting prism corresponding to at least one of the plurality of light-emitting components, and the reflecting prism being located on a laser-exit side of the at least one light-emitting component; wherein
the plurality of light-emitting components include a first light-emitting component and a second light-emitting component, a polarization direction of a laser beam emitted by the first light-emitting component and a polarization direction of a laser beam emitted by the second light-emitting component being perpendicular to each other, and a laser-exit direction of the first light-emitting component and a laser-exit direction of the second light-emitting component being perpendicular to each other, the polarization direction of the laser beam emitted by one of the first light-emitting component and the second light-emitting component being parallel to the base plate, and the polarization direction of the laser beam emitted by another of the first light-emitting component and the second light-emitting component being perpendicular to the base plate;
the reflecting prism is configured to reflect the laser beams emitted by the light-emitting components in a direction away from the base plate, and change a polarization polarity of one of the laser beam with the polarization direction perpendicular to the base plate or the laser beam with the polarization direction parallel to the base plate, so as to make the polarization directions of the laser beams reflected by the reflecting prism same; and
the laser beams exiting from the laser source in the direction away from the base plate constitute the illumination beams.