Image projection method and mems image projection apparatus

A microelectromechanical system (MEMS) image projection apparatus for applying an image projection method to project an image light beam on a projection plane along a first direction, the MEMS image projection apparatus comprising:

• a MEMS scanning mirror, having a resonance frequency and a damping coefficient when swinging around a first swing axis;
• a detection unit, detecting a swing position variation of the MEMS scanning mirror;
• a periodic wave signal generator, coupled to the MEMS scanning mirror, for outputting a periodic wave signal having a first frequency to the MEMS scanning mirror according to a first amplitude scale and a first maintaining period, so as to control the MEMS scanning mirror to swing around the first swing axis according to the first frequency, and accordingly project an image light beam on the projection plane along the first direction;
• and
• a control unit, coupled to the periodic wave signal generator and the detection unit, for calculating the first amplitude scale and the first maintaining period according to the resonance frequency and the damping coefficient, and controlling the periodic wave signal generator to output the periodic wave signal,
• wherein the control unit calculates a swing speed error of the MEMS scanning mirror according to the swing position variation of the MEMS scanning mirror, the control unit adjusts the first amplitude scale and the first maintaining period and records the corresponding swing speed error, the control unit controls the periodic wave signal generator to output a corrected periodic wave signal according to the recorded swing speed error, so as to control the MEMS scanning mirror to swing.