公开(公告)号：EP4375618A1

公开(公告)日：2024-05-29

申请号：EP23207357.7

申请日：2023-11-02

Applicant: STMicroelectronics S.r.l.

Inventor： RIZZARDINI, Federico ,  BRACCO, Lorenzo

IPC: G01C21/16

CPC classification number: G01C21/185

Abstract: A device includes a memory and processing circuitry coupled to the memory. The processing circuitry, in operation: estimates an angular rate of change and determines a rotational versor based on the rotational data; and estimates a gravity vector based on the angular rate of change and the rotational versor. The processing circuitry generates a dynamic gravity vector based on the estimated gravity vector, a correction factor and an estimated error in estimated gravity vector. The processing circuitry estimates a linear acceleration and determines an acceleration versor based on the acceleration data, and determines the correction factor based on the linear acceleration. The processing circuitry estimates the error in the estimated gravity vector based on the acceleration versor.

公开(公告)号：EP4283435A1

公开(公告)日：2023-11-29

申请号：EP23172824.7

申请日：2023-05-11

Applicant: STMicroelectronics S.r.l.

Inventor： RIZZARDINI, Federico ,  BRACCO, Lorenzo

IPC: G06F1/16 ,  G06F1/3206 ,  G06F1/3287

Abstract: The present disclosure is directed to a device and method for lid angle detection that is accurate even if the device is activated in an upright position. While the device is in a sleep state, first and second sensor units measure acceleration and angular velocity, and calculate orientations of respective lid components based on the acceleration and angular velocity measurements. Upon the device exiting the sleep state, a processor estimates the lid angle using the calculated orientations, sets the estimated lid angle as an initial lid angle, and updates the initial lid angle using, for example, two accelerometers; two accelerometers and two gyroscopes; two accelerometers and two magnetometers; or two accelerometers, two gyroscopes, and two magnetometers.

公开(公告)号：EP4170461A1

公开(公告)日：2023-04-26

申请号：EP22201942.4

申请日：2022-10-17

Applicant: STMicroelectronics S.r.l.

Inventor： RIVOLTA, Stefano Paolo ,  MURA, Roberto ,  BRACCO, Lorenzo ,  RIZZARDINI, Federico

IPC: G06F1/16

Abstract: Detection method (50) of a first or second state of a foldable electronic device (10) comprising a first and a second hardware element (12; 14) tiltable to each other and accommodating a first and a second electrode (20b; 22b) which are in contact with each other when the foldable electronic device is in the first state and at a distance from each other otherwise. The detection method (50) is performed by a control unit (23) of the foldable electronic device and comprises the steps of: acquiring (S10) a first and a second charge variation signal indicative of environmental electric/electrostatic charge variations detected by the first and second electrodes; generating (S12) a differential signal (S D ) indicative of a difference between the first (S Q1 ) and the second (S Q2 ) charge variation signals; generating (S14, S16, S18, S20), as a function of the differential signal (S D ), one or more feature signals (S T ); and generating (S22), as a function of the one or more feature signals (S T ), a contact signal (Sc) indicative of the first or second states of the foldable electronic device (10) .

公开(公告)号：EP3859498A1

公开(公告)日：2021-08-04

申请号：EP21154066.1

申请日：2021-01-28

Applicant: STMicroelectronics S.r.l.

Inventor： RIZZARDINI, Federico ,  RIVOLTA, Stefano Paolo ,  BRACCO, Lorenzo

IPC: G06F3/0346 ,  G06F3/0354

Abstract: In a pointing electronic device (1), a sensor fusion processing stage (5) generates an orientation estimation quantity (β') indicative of an orientation about a longitudinal axis (Y) based on a sensor fusion algorithm envisaging processing of acceleration (Acc) and gyroscopic (Gyro) signals; and a pointing determination stage implements an orientation-compensation of the gyroscopic signal as a function of the orientation estimation and generates screen-frame displacement data corresponding to 3D-space movements of the pointing electronic device based on the orientation-compensated gyroscopic signal. A first processing block (20) improves a starting value of the roll estimation, used to decrease an initial roll estimation error, by storing past values of the acceleration signal, during a time interval preceding start-up; and, upon start-up, retrieving and processing the stored past values to generate processed acceleration data, used by the sensor fusion processing stage to initialize the sensor fusion algorithm and generate the starting value of the roll estimation quantity. A second processing block 22 increases the speed of recovery of the initial orientation estimation error after start-up. (Figure 5)

公开(公告)号：EP3771968A1

公开(公告)日：2021-02-03

申请号：EP20188660.3

申请日：2020-07-30

Applicant: STMicroelectronics S.r.l.

Inventor： RIVOLTA, Stefano Paolo ,  RIZZARDINI, Federico ,  BRACCO, Lorenzo

IPC: G06F3/033 ,  G06F3/0346 ,  G06F3/038

Abstract: A pointing method to generate screen-frame displacement data based on 3D-space movements of a pointing electronic device (1), envisages: receiving a gravity vector (g), having components (g x , g y , g z ) corresponding to respective projections of gravity acceleration ( g ) on three axes (X, Y, Z) of a 3D reference system associated with the pointing electronic device (1), generated by a sensor-fusion algorithm from joint processing of an acceleration signal (Acc), indicative of acceleration acting on the pointing electronic device (1) along the three axes (X, Y, Z) of the 3D reference system, and of a gyroscope signal (Gyro), indicative of angular rate of rotation of the pointing electronic device (1) around the three axes (X, Y, Z) of the 3D reference system. The method further envisages: implementing a roll-compensation of the gyroscope signal (Gyro) as a function of the gravity vector (g) to determine a roll-compensated gyroscope signal (Gyro'); and generating the screen-frame displacement data based on the roll-compensated gyroscope signal (Gyro').