International Display Workshops Incorporated Association

9:20 AM - 9:40 AM

[PRJ2-2] Laser Beam Modulation with a Fast Focus Tunable Lens for Speckle Reduction in Laser Projection Displays

Zequn Jian1, *Zhaomin Tong1, Yifei Ma1, Mei Wang1, Suotang Jia1, Xuyuan Chen1,2 (1. Shanxi University (China), 2. University of Southeast Norway (Norway))

speckle reduction, focus tunable lens, angular diversity, spatial diversity

https://doi.org/10.36463/idw.2019.1275

We propose a laser speckle reduction method using a fast focus tunable lens (FTL). Different laser beams are generated after modulating the FTL. Thus, when the laser beams are used to illuminate a diffuser, various speckle images are obtained, and the summed speckle images yield a speckle image with reduced speckle contrast ratio.