公开(公告)号：US10527842B2

公开(公告)日：2020-01-07

申请号：US15945570

申请日：2018-04-04

Applicant: STMicroelectronics LTD

Inventor： Avi Resler

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

Abstract: A projector includes a mirror quasi-statically driven by a drive signal to scan a laser beam in a pattern. A drive circuit generates the drive signal so the mirror moves in a non-linear fashion, yielding unwanted resonances. The non-linearity results in movement of the mirror through a first projection area, into a dead zone, and into a second projection area. The laser beam is emitted as the mirror moves through the first and second projection areas, but not the dead zone. A controller samples a feedback signal of the mirror as it moves through the first and second projection areas, producing first and second projection area sample which are processed to produce first and second ripple measurements. First and second correction signals are generated as a function of the ripple measurements. The drive circuit applies the correction signals to the drive signal so that the unwanted resonances are attenuated.

公开(公告)号：US10859817B2

公开(公告)日：2020-12-08

申请号：US16701495

申请日：2019-12-03

Applicant: STMicroelectronics Ltd

Inventor： Avi Resler

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

Abstract: A controller chip includes processing circuitry configured to process received samples by estimating trend functions from the samples, subtracting the trend functions from the samples to produce de-trended samples, performing a mathematical transform on the de-trended samples to produce frequency bins. The frequency bins may correspond to unwanted resonance movement of a movable mirror associated with the received samples. The processing circuit further generates an error function from the frequency bins. The error function can be used to generate correction signals for the movable mirror that serve to minimize the error function.