US 12,265,233 B2
Method for increasing speckle spot density, diffractive optical element, and projector
Peng Chen, Zhejiang (CN); and Lei Sui, Zhejiang (CN)
Assigned to JIAXING UPHOTON OPTOELECTRONICS TECHNOLOGY CO., LTD., Zhejiang (CN)
Filed by JIAXING UPHOTON OPTOELECTRONICS TECHNOLOGY CO., LTD., Zhejiang (CN)
Filed on Oct. 28, 2024, as Appl. No. 18/928,971.
Application 18/928,971 is a continuation of application No. PCT/CN2023/095502, filed on May 22, 2023.
Prior Publication US 2025/0053023 A1, Feb. 13, 2025
Int. Cl. G02B 27/48 (2006.01); G01B 11/25 (2006.01); G02B 27/00 (2006.01); G02B 27/09 (2006.01)
CPC G02B 27/48 (2013.01) [G01B 11/254 (2013.01); G02B 27/0012 (2013.01); G02B 27/0905 (2013.01); G02B 27/0944 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for increasing a speckle density, comprising:
S11: acquiring a beam-splitting point array, wherein the beam-splitting point array is used for performing array replication and projection on a multi-point light source to form a speckle array;
S12: acquiring a minimum adjacent point spacing or an average adjacent point spacing of all or some of light-emitting points in the multi-point light source;
S13: dividing the beam-splitting point array into a first beam-splitting point array and a second beam-splitting point array, wherein a speckle array formed by projection through the first beam-splitting point array is located in a first speckle region, and a speckle array formed by projection through the second beam-splitting point array is located in a second speckle region; and
S14: performing extension replication, according to the minimum adjacent point spacing or the average adjacent point spacing of all or some of the light-emitting points, on each beam-splitting point in the second beam-splitting point array to form a third beam-splitting point array, wherein a speckle array formed by projection through the third beam-splitting point array falls in the second speckle region to increase a speckle density in the second speckle region and keep a speckle density in the first speckle region unchanged.