Scan projection device and scan controlling method thereof

Abstract

A scan projection device and a controlling method are projected. The scan projection device comprises a light source module, a scanning module and a scan driving device. The light source module is for providing an image beam. The scanning module has a first direction scanning frequency and a second direction scanning frequency. The first direction scanning frequency is 2N+1 times of the second direction scanning frequency, wherein N is an integer. The scanning module is for projecting the image beam towards a particular direction and scanning a projection surface. The scan driving device controls the scanning module to scan the projection surface back and forth along a scan trace at the first direction scanning frequency and the second direction scanning frequency.

Dependencies are inferred from the claim text.