Patent ID: 9013774
Filing Date: 2015-04-21
Classification: G02B,G09G

Abstract:
1. A projection controlling method, for controlling a microelectromechanical systems (MEMS) scanning mirror, wherein the MEMS scanning mirror scans an image light to perform repeated scanning operations on a surface to form a projection image, the projection controlling method comprising: detecting a resonance frequency of the MEMS scanning mirror when the MEMS scanning mirror swings around a first swing axis with a plurality of frequencies; providing the resonance frequency to a filter unit as a parameter of a filtering process; generating a first periodic control signal with a first frequency, wherein the first periodic control signal has a plurality of harmonic components; filtering the first periodic control signal by using the filter unit, wherein the filter unit filters the harmonic component with the resonance frequency out of the first periodic control signal according to the parameter; and providing the filtered first periodic control signal to the MEMS scanning mirror to control the MEMS scanning mirror to swing around the first swing axis according to the first frequency, so as to scan the image light on the surface back and forth along a first direction.