公开(公告)号：US12001012B2

公开(公告)日：2024-06-04

申请号：US17238596

申请日：2021-04-23

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

Inventor： Davide Terzi ,  Gianluca Mendicino ,  Dadi Sharon

IPC: G02B26/10 ,  B81B3/00 ,  G02B26/08 ,  G09G3/34 ,  H02N2/10 ,  H02N2/14 ,  H03H9/15 ,  H10N30/20 ,  H10N30/853

CPC classification number: G02B26/101 ,  B81B3/0021 ,  G02B26/0858 ,  G09G3/346 ,  H02N2/103 ,  H02N2/145 ,  H03H9/15 ,  H10N30/204 ,  B81B2201/032 ,  H10N30/8554

Abstract: Disclosed herein is a microelectromechanical (MEMS) device, including a rotor and a first piezoelectric actuator mechanically coupled to the rotor. The first piezoelectric actuator is electrically coupled between a first signal node and a common voltage node. A second piezoelectric actuator is mechanically coupled to the rotor, and is electrically coupled between a second signal node and the common voltage node. Control circuitry includes a drive circuit configured to drive the first and second piezoelectric actuators, a sense circuit configured to process sense signals generated by the first and second pizeoelectric actuators, and a multiplexing circuit. The multiplexing circuit is configured to alternate between connecting the drive circuit to the first piezoelectric actuator while connecting the sense circuit to the second piezoelectric actuator, and connecting the drive circuit to the second piezoelectric actuator while connecting the sense circuit to the first piezoelectric actuator.

公开(公告)号：US11474425B2

公开(公告)日：2022-10-18

申请号：US16540557

申请日：2019-08-14

Applicant: STMicroelectronics LTD

Inventor： Eli Yaser ,  Guy Amor ,  Yotam Nachmias ,  Dadi Sharon ,  Sivan Nagola

IPC: G03B21/28 ,  G02B26/08 ,  G02B26/10 ,  G03B21/20

Abstract: A control circuit includes a first control circuit generating a first drive control signal from a pre-drive signal (that is a frequency at which an opening angle of the first and second mirrors is equal) for the first mirror. A second control circuit generates a second drive control signal from the pre-drive signal for the second mirror. First and second drivers generate first and second drive signals for the first and second mirrors from the first and second drive control signals. The first and second drive control signals are generated so that the first and second drive signals each have a same frequency as the pre-drive signal but are different in amplitude from one another to cause the first and second mirrors to move at a same frequency, with a same and substantially constant given opening angle as one another, and in phase with one another.

公开(公告)号：US11054635B1

公开(公告)日：2021-07-06

申请号：US16789725

申请日：2020-02-13

Applicant: STMicroelectronics LTD

Inventor： Eli Yaser ,  Dadi Sharon

IPC: H04N9/31 ,  G02B26/10 ,  G02B26/08 ,  G03B21/28

Abstract: A system includes a mirror controller driving fast and slow axis mirrors of a projector with fast and slow axis drive signals to reflect a collimated light beam in a scan pattern across the target. The scan pattern includes trace lines which cause display of an input video stream on the target, and retrace lines which operate to return the slow axis mirror to a proper location to begin a next frame of the scan pattern. The slow axis drive signal is generated to maintain a number of trace lines in each frame of the scan pattern constant across frames, but the slow axis drive signal is modified to lock a phase and frequency of the displayed video to a phase and frequency of the input video stream by changing a number of retrace lines in each frame of the scan pattern on a frame-by-frame basis by a non-integer number.

公开(公告)号：US20170285327A1

公开(公告)日：2017-10-05

申请号：US15280691

申请日：2016-09-29

Applicant: STMicroelectronics Ltd

Inventor： Offir Duvdevany ,  Dadi Sharon ,  Sason Sourani

IPC: G02B26/08 ,  G02B26/10 ,  G03B21/00 ,  G02B7/182

CPC classification number: G02B26/0833 ,  G02B7/1821 ,  G02B26/0841 ,  G02B26/105 ,  G03B21/008

Abstract: The method for controlling an angular position of a MEMS mirror, includes: applying a first driving moment to the MEMS mirror to generate a rotational scanning movement of the mirror; and, at a zooming instant, applying a second driving moment to the MEMS mirror, wherein the second driving moment is equal to the first driving moment plus an extra moment. The extra moment may be a DC offset. After a transient period of time from zooming instant, a third driving moment M2=k{dot over (θ)}2t is applied. The first and third driving moment are variable linearly with time. The driving moments are applied to torsional springs of the mirror.