Patent ID: 11906890
Assignee: HISENSE LASER DISPLAY CO., LTD
Field: Optics (Instruments)
Classification: CPC G  H | IPC G  H

Claim 10:
11. The laser projection apparatus according to claim 5, wherein a side wall of a rotating shaft of the three-phase motor includes a first region and a second region arranged along a circumference of the rotating shaft, a reflectivity of the first region differs from a reflectivity of the second region; and
the timing control sub-circuit includes a detection unit and a sensor arranged opposite to the rotating shaft; the sensor is configured to transmit a detection signal, receive a reflection signal reflected by the side wall of the rotating shaft, detect an intensity of the reflection signal, and transmit the intensity of the reflection signal to the detection unit; and the detection unit is configured to generate the frequency signal according to a change frequency of intensities of reflection signals, and transmit the frequency signal to the main control circuit.