公开(公告)号：US20230234836A1

公开(公告)日：2023-07-27

申请号：US17583896

申请日：2022-01-25

Applicant: STMicroelectronics S.r.l.

Inventor： Raffaele Enrico FURCERI ,  Luca MOLINARI

IPC: B81B7/00 ,  G02B26/08 ,  B81B3/00

CPC classification number: B81B7/008 ,  B81B3/0043 ,  G02B26/0833 ,  B81B2201/042 ,  B81B2207/03

Abstract: Techniques to be described herein are based upon the combination of a digital lock-in amplifier approach with a numerical method to yield accurate estimations of the amplitude and phase of a sense signal obtained from a movement sensor associated with a resonant MEMS device such as a MEMS mirror. The techniques described herein are efficient from a computational point of view, in a manner which is suitable for applications in which the implementing hardware is to follow size and power consumption constraints.

公开(公告)号：US20210409661A1

公开(公告)日：2021-12-30

申请号：US17356162

申请日：2021-06-23

Applicant: STMICROELECTRONICS S.r.l.

Inventor： Luca MOLINARI ,  Daniele D'ELIA

IPC: H04N9/31 ,  G02B26/08 ,  G06T7/50 ,  H04N5/06

Abstract: A device has memory and processing circuitry coupled to the memory. The processing circuitry generates a resonant axis drive signal to drive a Micro Electro Mechanical System (MEMS) mirror system at a resonance frequency, and generates a linear axis drive signal to drive the MEMS mirror system at a linear frequency corresponding to a video frame rate. Generating the linear axis drive signal includes generating, using interpolation, a current set of shape values based on a stored set of shape values and an indication of the video frame rate. The linear axis drive signal is generated using the current set of shape values.

公开(公告)号：US20230092956A1

公开(公告)日：2023-03-23

申请号：US17979363

申请日：2022-11-02

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

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

IPC: G03B21/14 ,  G03B21/20 ,  G01J1/02 ,  G01J1/44 ,  G03B21/00

Abstract: A scanning laser projector includes an optical module with a housing defined by a top surface, a bottom surface, and sidewalls extending between the top surface and bottom surface to define an interior compartment within the housing. A given one of the sidewalls has an exit window defined therein. A first light detector is positioned at an interior surface of the given one of the sidewalls about a periphery of the exit window. A second light detector positioned at the interior surface of the given one of the sidewalls about the periphery of the exit window and on a different side thereof than the first light detector.

公开(公告)号：US20220171180A1

公开(公告)日：2022-06-02

申请号：US17109929

申请日：2020-12-02

Applicant: Politecnico Di Milano ,  STMicroelectronics S.r.l.

Inventor： Paolo FRIGERIO ,  Giacomo LANGFELDER ,  Luca MOLINARI ,  Giuseppe MAIOCCHI ,  Andrea BARBIERI

IPC: G02B26/08 ,  B06B1/02

Abstract: Disclosed herein is a control system for a projection system, including a first subtractor receiving an input drive signal and a feedback signal and generating a first difference signal therefrom, the feedback signal being indicative of position of a quasi static micromirror of the projection system. A type-2 compensator receives the first difference signal and generates therefrom a first output signal. A derivative based controller receives the feedback signal and generates therefrom a second output signal. A second subtractor receives the first and second output signals and generates a second difference signal therefrom. The second difference signal serves to control a mirror driver of the projection system. A higher order resonance equalization circuit receives a pre-output signal from an analog front end of the projection system that is indicative of position of the quasi static micromirror, and generates the feedback signal therefrom.

公开(公告)号：US20230090636A1

公开(公告)日：2023-03-23

申请号：US17479345

申请日：2021-09-20

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

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

IPC: G03B21/14 ,  G03B21/00 ,  G03B21/20 ,  G01J1/02 ,  G01J1/44

Abstract: A scanning laser projector includes an optical module and projection engine. The optical module includes a laser generator outputting a laser beam, and a movable mirror 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 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 adjusts driving of the movable mirror based upon output from the first light detector.

公开(公告)号：US20220334378A1

公开(公告)日：2022-10-20

申请号：US17720506

申请日：2022-04-14

Applicant: STMicroelectronics S.r.l.

Inventor： Roberto CARMINATI ,  Nicolo' BONI ,  Andrea BARBIERI ,  Marco ZAMPROGNO ,  Luca MOLINARI

IPC: G02B26/08 ,  H02N2/02 ,  H02N2/06

Abstract: A MEMS device includes a semiconductor body with a cavity and forming an anchor portion, a tiltable structure elastically suspended over the cavity, first and second support arms to support the tiltable structure, and first and second piezoelectric actuation structures biasable to deform mechanically, generating a rotation of the tiltable structure around a rotation axis. The piezoelectric actuation structures carry first and second piezoelectric displacement sensors. When the tiltable structure rotates around the rotation axis, the displacement sensors are subject to respective mechanical deformations and generate respective sensing signals in phase opposition to each other, indicative of the rotation of the tiltable structure. The sensing signals are configured to be acquired in a differential manner.