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Replacing Two-Dimensional Binary Phase Matrix by a Pair of One-Dimensional Dynamic Phase Matrices for Laser Speckle Reduction

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5 Author(s)
Wenhong Gao ; Sch. of Mech. & Vehicular Eng., Beijing Inst. of Technol., Beijing, China ; Zhaomin Tong ; Kartashov, V. ; Akram, M.N.
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In this paper, a method is proposed to create a pair of one dimensional binary phase modulator matrices 1D-BPMs, which is mathematically equivalent to a single two-dimensional binary phase modulator matrix 2D-BPM based on Sylvester constructed Hadamard matrices. An advantage of 1D-BPM over 2D-BPM is that the number of drive electrodes can be reduced from N2 to 2N for a N×N Hadamard phase matrix, thus simplifying the drive interconnects and drive electronics. 1D-BPM can be based on electro-optical material and hence can be driven electrically, which is an advantage over the 2D-BPM which is usually etched on a glass substrate and actuated mechanically to implement the speckle reduction in laser projectors. We have discussed the algorithm for constructing the pair of dynamic 1D-BPMs to replace the 2D-BPM. Preliminary experiments are performed to demonstrate the validity of our concept.

Published in:

Display Technology, Journal of  (Volume:8 ,  Issue: 5 )

Date of Publication:

May 2012

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