公开(公告)号：US20220276075A1

公开(公告)日：2022-09-01

申请号：US17742999

申请日：2022-05-12

Applicant: PixArt Imaging Inc.

Inventor： SWEE-LIN THOR ,  GIM-ENG CHEW

IPC: G01D5/347 ,  H03K5/24 ,  H03K5/13

Abstract: There is provided an optical encoder including a phase shifter circuit, two multiplexers, two digital circuits and four comparators. The phase shifter circuit receives signals from an amplifier and outputs multiple phase shifted signals. Each of the two multiplexers receives a half of the multiple phase shifted signals and outputs two pairs of phase shifted signals, each pair having 180 degrees phase difference, respectively to two comparators connected thereto. Each of the two digital circuits controls the corresponding multiplexer to select the two pairs of phase shifted signals from the half of the multiple phase shifted signals.

公开(公告)号：US20210218921A1

公开(公告)日：2021-07-15

申请号：US17213702

申请日：2021-03-26

Applicant: PixArt Imaging Inc.

Inventor： KWAI-LEE PANG ,  SWEE-LIN THOR

IPC: H04N5/378 ,  H04N5/235 ,  H04N5/355 ,  G06F3/01

Abstract: A pixel circuit including a photodiode, a first storage capacitor and a second storage capacitor is provided. The first storage capacitor discharges to a first output voltage in a first exposure time and to a third output voltage in a third exposure time. The second storage capacitor discharges to a second output voltage in a second exposure time and to a fourth output voltage in a fourth exposure time. The first and second exposure times are included in a first frame period. The third and fourth exposure times are included in a second frame period. The second frame period is a next frame period of the first frame period. In the first frame period, the first exposure time is subsequent to the second exposure time. In the second frame period, the third exposure time is prior to the fourth exposure time.

公开(公告)号：US20200053305A1

公开(公告)日：2020-02-13

申请号：US16658303

申请日：2019-10-21

Applicant: PixArt Imaging Inc.

Inventor： KWAI-LEE PANG ,  SWEE-LIN THOR

IPC: H04N5/378 ,  H04N5/235 ,  H04N5/355 ,  G06F3/01

Abstract: A pixel circuit including a photodiode, a first storage capacitor and a second storage capacitor is provided. The first storage capacitor discharges to a first output voltage in a first exposure time and to a third output voltage in a third exposure time. The second storage capacitor discharges to a second output voltage in a second exposure time and to a fourth output voltage in a fourth exposure time. The first and second exposure times are included in a first frame period. The third and fourth exposure times are included in a second frame period. The second frame period is a next frame period of the first frame period. In the first frame period, the first exposure time is subsequent to the second exposure time. In the second frame period, the third exposure time is prior to the fourth exposure time.

公开(公告)号：US20230208412A1

公开(公告)日：2023-06-29

申请号：US18111602

申请日：2023-02-20

Applicant: PixArt Imaging Inc.

Inventor： SWEE-LIN THOR ,  GIM-ENG CHEW

IPC: H03K5/24 ,  G01D5/347 ,  H03K5/13

CPC classification number: H03K5/24 ,  G01D5/34715 ,  H03K5/13 ,  G01D5/34792 ,  H03K2005/00052

Abstract: There is provided an optical encoder including a phase shifter circuit, two multiplexers, two digital circuits and four comparators. The phase shifter circuit receives signals from an amplifier and outputs multiple phase shifted signals. Each of the two multiplexers receives a half of the multiple phase shifted signals and outputs two pairs of phase shifted signals, each pair having 180 degrees phase difference, respectively to two comparators connected thereto. Each of the two digital circuits controls the corresponding multiplexer to select the two pairs of phase shifted signals from the half of the multiple phase shifted signals.