One-dimensional dimension binary-code phase modulator (1D-BPM) for speckle reduction in laser display system is designed based on Pb(Mg1/3Nb2/3)O3-PbTiO3 (PMN-PT) and microelectromechnical system (MEMS) microfabrication technology. Mathematical model of 1D-BPM is built up, and the relationship between phase shift and electrical field applied by electrodes is deduced. Electrode configuration is investigated by simulation with finite element analysis. We find that the phase distribution across the gap between two electrodes depends not only on the electric field applied by electrodes, but also on the electrodes′ configuration when their dimensions are on the submicron order. Electrodes corner effect is the significant factors for device design and optimization.