Scan projection device and scan controlling method thereof
View Patent ↗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.
1. A controlling method of a scan projection device, wherein the scan projection device comprises a scanning module for reflecting and driving an image beam to scan on a projection surface, and the controlling method comprises:
controlling the scanning module to drive the image beam to scan on the projection surface along a first direction at a first direction scanning frequency and along a second direction at a second direction scanning frequency, wherein the first direction scanning frequency is 2N+1 times of the second direction scanning frequency, and N is an integer; and
controlling the scanning module to drive the image beam to scan on the projection surface back and forth along a scan trace.
2. The controlling method according to claim 1 , wherein the first direction scanning frequency is a sine wave frequency.
3. The controlling method according to claim 1 , wherein the second direction scanning frequency is a sine wave frequency.
4. The controlling method of according to claim 1 , wherein the first direction scanning frequency is a mono frequency.
5. The controlling method of according to claim 1 , wherein the second direction scanning frequency is a mono frequency.
6. The controlling method of according to claim 1 , wherein the scanning module drives the image beam to scan on the projection surface along the scan trace forwardly and reversely within a scan period of the second direction scanning frequency.
7. A scan projection device, comprising
a light source module for providing an image beam;
a scanning module for reflecting and driving the image beam to scan on a projection surface along a first direction at a first direction scanning frequency and along a second direction at a second direction scanning frequency, wherein the first direction scanning frequency is 2N+1 times of the second direction scanning frequency, and N is an integer; and
a scan driving device for controlling the scanning module to drive the image beam to scan on the projection surface back and forth along a scan trace.
8. The scan projection device according to claim 7 , wherein the first direction scanning frequency and the second direction scanning frequency both are a sine wave frequency.
9. The scan projection device according to claim 7 , wherein the first direction scanning frequency and the second direction scanning frequency both are a mono frequency.
10. The scan projection device according to claim 7 , wherein within a scan period of the second direction scanning frequency, the scan driving device controls the scanning module to drive the image beam to scan on the projection surface along the scan trace forwardly and reversely.