公开(公告)号：US20190199986A1

公开(公告)日：2019-06-27

申请号：US16032634

申请日：2018-07-11

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

Inventor： Massimo RATTI ,  Naomi PETRUSHEVSKY ,  Eli YASER ,  Yotam NACHIMIAS

IPC: H04N9/31 ,  G06T1/20

CPC classification number: H04N9/3182 ,  G06T1/20 ,  H04N9/3135

Abstract: A light projection system includes a light module emitting a light beam and a movable mirror reflecting the light beam toward a surface. A graphics processing unit processes video data to compensate for a response of the light module. The response is an optical power of the light beam produced by the light module for a given forward current through the light module. A light source driver controls the light module as a function of the processed video data. Colors of the images from the video data produced on the surface by the light beam would otherwise not look as they are intended to look due to changing of the response of the light module, but the processing of the video data alters the video data such that the colors of the images from the video data produced on the surface look as they are intended to look.

公开(公告)号：US20200029058A1

公开(公告)日：2020-01-23

申请号：US16585751

申请日：2019-09-27

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

Inventor： Massimo RATTI ,  Eli YASER ,  Naomi PETRUSHEVSKY ,  Yotam NACHMIAS

IPC: H04N9/31 ,  G06T1/20

Abstract: A light projection system includes a GPU that receives video data containing video images, defines a two-dimensional grid (each element of which represents a position of a light beam at a different time), designates which elements of the two-dimensional grid correspond to positions of the light beam in a designated area, designates which elements correspond to positions of the light beam outside of the designated area with some positions outside being designated as calibration positions, maps each element corresponding to positions in the designated area to a corresponding pixel of a frame of a video image, and maps elements corresponding to calibration positions to calibration pixels. An ASIC receives the mapped pixels and mapped calibration pixels from the GPU, and generates a beam position control signal therefrom. A controller controls a movable mirror based on the beam position control signal.

公开(公告)号：US20220006988A1

公开(公告)日：2022-01-06

申请号：US17479176

申请日：2021-09-20

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

Inventor： Massimo RATTI ,  Eli YASER ,  Naomi PETRUSHEVSKY ,  Yotam NACHMIAS

IPC: H04N9/31 ,  G06T1/20

Abstract: A light projection system includes a MEMS mirror operating on a mirror drive signal to generate a mirror sense signal resulting from operation of the MEMS mirror based on the mirror drive signal. A mirror driver generates the mirror drive signal from a drive control signal. A controller receives the mirror sense signal from the MEMS mirror, obtains a first sample of the mirror sense signal at a first phase thereof, obtains a second sample of the mirror sense signal at a second phase thereof, wherein the first and second phases are separated by a half period of the mirror drive signal, with the second phase occurring after the first phase, and generates the drive control signal based on a difference between the first and second samples to keep the mirror drive signal separated in phase from the mirror sense signal by a desired amount of phase separation.

公开(公告)号：US20190306380A1

公开(公告)日：2019-10-03

申请号：US15941717

申请日：2018-03-30

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

Inventor： Eli YASER ,  Massimo RATTI ,  Naomi PETRUSHEVSKY

IPC: H04N5/06 ,  H04N9/31 ,  H04N7/01

Abstract: Described herein is a video projection system including an optical module with at least one collimated light source to generate a light beam and at least one movable mirror to reflect the light beam. The video projection system also includes a video source producing a digital video stream in accordance with a clock signal and a movement synchronization signal, as well as a projector system. The projector system includes mirror control circuitry configured to control movement of the at least one movable mirror in accordance with the clock signal and the movement synchronization signal, a light source controller configured to control generation of collimated light by the at least one collimated light source, and processing circuitry configured to receive the digital video stream, and to generate control signals for the light source controller based upon the received digital video stream.

公开(公告)号：US20200301127A1

公开(公告)日：2020-09-24

申请号：US16897491

申请日：2020-06-10

Applicant: STMicroelectronics LTD

Inventor： Elik HARAN ,  Offir DUVDEVANY ,  Naomi PETRUSHEVSKY

IPC: G02B26/08 ,  G01R19/04 ,  H02P25/032 ,  G02B26/10

Abstract: An electronic device includes an analog to digital converter receiving an analog mirror sense signal from an oscillating mirror and generating a digital mirror sense signal therefrom, and a digital signal processing block. The digital signal processing block cooperates with the analog to digital converter to take a first sample of the digital mirror sense signal at a first time where a derivative of capacitance of the digital mirror sense signal crosses zero, take a second sample of the digital mirror sense signal at a second time between a peak of the digital mirror sense signal and the first time, and take a third sample of the digital mirror sense signal at a third time after the digital mirror sense signal has reached a minimum. Control circuitry determines an opening angle of the oscillating mirror as a function of the first, second, and third samples.