公开(公告)号：EP4152744A1

公开(公告)日：2023-03-22

申请号：EP22195417.5

申请日：2022-09-13

Applicant: STMicroelectronics Ltd ,  STMicroelectronics S.r.l.

Inventor： DOMNITS, Alex ,  ROTH, Elan ,  TERZI, Davide ,  MOLINARI, Luca ,  BOSCHI, Marco

IPC: H04N9/31

Abstract: A scanning laser projector (40) includes an optical module (10) and projection engine (41). The optical module includes a laser generator outputting a laser beam, and a movable mirror (20, 24) scanning the laser beam across an exit window defined through the housing in a scanning pattern wider than the exit window such that the laser beam is directed through the exit window in a projection pattern that is smaller than and within the scanning pattern. A first light detector (18a, 18b) is positioned about a periphery of the exit window such that as the movable mirror scans the laser beam in the scan pattern, at a point in the scan pattern where the laser beam is scanned across an interior of the housing and not through the exit window, the laser beam impinges upon the first light detector. The projection engine (41) adjusts driving of the movable mirror based upon output from the first light detector (18a, 18b).

公开(公告)号：EP4013047A1

公开(公告)日：2022-06-15

申请号：EP21210597.7

申请日：2021-11-25

Applicant: STMicroelectronics S.r.l.

Inventor： TERZI, Davide

IPC: H04N9/31 ,  G02B26/10 ,  G02B26/08

Abstract: A method of operating a MEMS device (11) includes generating a MEMS drive signal (DRV1, DRV2), and generating and modifying the MEMS drive signal based upon a control signal (LGK) to produce a modified drive signal (D1, D2). The method further includes generating the control signal by determining when a feedback signal (FBK) from the MEMS device is at its peak value, comparing the peak value to a desired value when the feedback signal (FBK) is as its peak, and generating the control signal depending upon whether the peak value is at least equal to a desired value. The modification of the MEMS drive signal based upon the control signal to produce the modified drive signal (D1, D2) includes skipping generation of a next pulse of the modified drive signal when the control signal indicates the peak value is at least equal to the desired value.