US 12,405,523 B2
Laser projection apparatus
Wei Li, Qingdao (CN); Xiaoqiang Gu, Qingdao (CN); and Youliang Tian, Qingdao (CN)
Assigned to HISENSE LASER DISPLAY CO., LTD, Qingdao (CN)
Filed by Hisense Laser Display Co., Ltd, Qingdao (CN)
Filed on Sep. 16, 2022, as Appl. No. 17/946,318.
Application 17/946,318 is a continuation of application No. PCT/CN2021/081818, filed on Mar. 19, 2021.
Claims priority of application No. 202010247119.4 (CN), filed on Mar. 31, 2020; and application No. 202010247120.7 (CN), filed on Mar. 31, 2020.
Prior Publication US 2023/0020534 A1, Jan. 19, 2023
Int. Cl. G03B 21/20 (2006.01); G03B 21/14 (2006.01); H04N 9/31 (2006.01)
CPC G03B 21/2066 (2013.01) [G03B 21/142 (2013.01); H04N 9/3152 (2013.01); H04N 9/3161 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A laser projection apparatus, comprising:
a laser source assembly configured to emit illumination beams;
an optical engine configured to modulate the illumination beams emitted by the laser source assembly, so as to obtain projection beams; and
a projection lens configured to project the projection beams into an image;
the laser source assembly including:
a laser device, the laser device including:
a first laser-exit region emitting laser beams of first color;
a second laser-exit region emitting laser beams of second color; and
a third laser-exit region emitting laser beams of third color; and
a combining lens group, the combining lens group including:
a plurality of combining lenses corresponding to the first laser-exit region, the second laser-exit region and the third laser-exit region respectively, the plurality of combining lenses being configured to combine the laser beams of first color, the laser beams of second color and the laser beams of third color, and emit the combined laser beams to a beam outlet of the laser source assembly; and
a beam spot adjustment structure disposed in beam paths of the laser beams of first color and the laser beams of second color before being combined with the laser beams of third color, the beam spot adjustment structure being configured to increase a divergence angle of at least one of the laser beams of first color or the laser beams of second color; wherein
the laser beams exiting from the beam outlet of the laser source assembly constitutes the illumination beams.