公开(公告)号：EP3226058A1

公开(公告)日：2017-10-04

申请号：EP16190250.7

申请日：2016-09-22

Applicant: STMicroelectronics Ltd

Inventor： DUVDEVANY, Offir ,  SHARON, Dadi ,  SOURANI, Sason

IPC: G02B26/08 ,  G02B26/10 ,  B81B3/00

CPC classification number: G02B26/0833 ,  B81B3/0048 ,  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 M 2 = k θ̇ 2 t is applied. The first and third driving moment are variable linearly with time. The driving moments are applied to torsional springs of the mirror.

Abstract translation: 用于控制MEMS反射镜的角位置的方法包括：向MEMS反射镜施加第一驱动力矩以产生反射镜的旋转扫描运动; 并且在变焦时刻向MEMS反射镜施加第二驱动时刻，其中第二驱动时刻等于第一驱动时刻加上额外时刻。 额外的时刻可能是直流偏移。 在从变焦瞬间过渡一段时间之后，施加第三个驱动时刻M2 =kθ̇2t。 第一和第三驱动时刻随时间线性变化。 驾驶时刻应用于镜子的扭转弹簧。

公开(公告)号：EP3866463A1

公开(公告)日：2021-08-18

申请号：EP21153703.0

申请日：2021-01-27

Applicant: STMicroelectronics Ltd

Inventor： YASER, Eli ,  SHARON, Dadi

IPC: H04N9/31

Abstract: A system (30) includes a mirror controller driving fast (43) and slow (40) axis mirrors of a projector with fast (42) and slow (36) axis drive signals to reflect a collimated light beam (45) in a scan pattern across a 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 (36) 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 (38, 35) a phase (37) and frequency (39) of the displayed video to a phase (31) and frequency (32) 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：EP3779558A1

公开(公告)日：2021-02-17

申请号：EP20188304.8

申请日：2020-07-29

Applicant: STMicroelectronics Ltd

Inventor： YASER, Eli ,  AMOR, Guy ,  NACHMIAS, Yotam ,  SHARON, Dadi ,  NAGOLA, Sivan

IPC: G02B26/08 ,  G02B26/10

Abstract: A control circuit includes a first control circuit (14a) generating a first drive control signal (24a) from a pre-drive signal (21), which is a frequency at which an opening angle of first and second mirrors (11a,11b) is equal, for the first mirror (11a). A second control circuit (14b) generates a second drive control signal (24b) from the pre-drive signal (21) for the second mirror (11b). First and second drivers (13a,13b) generate first and second drive signals (22a,22b) for the first and second mirrors (11a,11b) from the first and second drive control signals (24a,24b). The first and second drive control signals (22a,22b) are generated so that the first and second drive signals (22a,22b) each have a same frequency as the pre-drive signal (21) but are different in amplitude from one another to cause the first and second mirrors (11a,11b) to move at a same frequency, with a same and substantially constant given opening angle as one another, and in phase with one another.