[OPTICAL REVIEW Vol. 19, No. 6 (2012) 440-443]
© 2012 The Japan Society of Applied Physics
Reduction of Speckles and Distortion in Projection System by Using a Rotating Diffuser
Chien-Yue CHEN1, Wei-Chia SU2, Ching-Huang LIN1, Ming-De KE3, Qing-Long DENG4, and Kuan-Yao CHIU1
1Department of Electronic Engineering, National Yunlin University of Science and Technology, Douliou, Yunlin 64002, Taiwan
2Graduate Institute of Photonics, National Changhua University of Education, Changhua 50007, Taiwan
3Graduate School of Engineering Science and Technology, National Yunlin University of Science and Technology, Douliou, Yunlin 64002, Taiwan
4Institute of Photonic Systems, National Chiao Tung University, Guiren, Tainan 71150, Taiwan
(Received May 31, 2012; Accepted August 31, 2012)
A head up display (HUD) with laser backlight unit has two principle problems; one is laser speckles and the other is distortion. In this study, we propose that a rotating diffuser set at the intermediate image plane of the HUD projection system can simultaneously solve these problems. The conditions of speckle reduction and de-distortion are also estimated in this paper.
Key words: head-up display (HUD), laser speckle, distortion