公开(公告)号：US20220066035A1

公开(公告)日：2022-03-03

申请号：US17007491

申请日：2020-08-31

Applicant: PixArt Imaging Inc.

Inventor： Yueh-Lin CHUNG ,  Tso-Sheng TSAI

IPC: G01S17/36 ,  G01S7/4911 ,  G01S7/4913 ,  G01S7/4915

Abstract: There is provided a distance measurement device including a light source, a light detector, a time control circuit and a processor. In first measurement, the time control circuit controls the light source to illuminate at a low modulation frequency, and the processor calculates a rough flying time according to a first detection signal of the light detector to determine an operating phase zone and a delay time. In second measurement, the time control circuit controls the light source to illuminate at a high modulation frequency and causes a light driving signal of the light source and a detecting control signal of the light detector to have a difference of the delay time, and the processor calculates a fine flying time according to a second detection signal of the light detector.

公开(公告)号：US20220026545A1

公开(公告)日：2022-01-27

申请号：US16936777

申请日：2020-07-23

Applicant: PixArt Imaging Inc.

Inventor： Tso-Sheng TSAI ,  Yueh-Lin CHUNG ,  Shin-Lin WANG

IPC: G01S7/497 ,  G01S17/10 ,  G01S7/4865 ,  G01S7/481

Abstract: There is provided a time of flight sensor including a light source, a first pixel, a second pixel and a processor. The first pixel generates a first output signal without receiving reflected light from an external object illuminated by the light source. The second pixel generates a second output signal by receiving the reflected light from the external object illuminated by the light source. The processor calculates deviation compensation and deviation correction associated with temperature variation according to the first output signal to accordingly calibrate a distance calculated according to the second output signal.

公开(公告)号：US20240036209A1

公开(公告)日：2024-02-01

申请号：US17878057

申请日：2022-08-01

Applicant: PIXART IMAGING INC.

Inventor： Tso-Sheng TSAI ,  Yueh-Lin CHUNG

IPC: G01S17/894 ,  G01S7/4865 ,  G01S7/481

CPC classification number: G01S17/894 ,  G01S7/4866 ,  G01S7/4816

Abstract: There is provided an optical sensor including a light source, a first pixel, a second pixel and a processor. The first pixel generates a first output signal by receiving reflected light from an external object illuminated by the light source. The second pixel generates a second output signal by receiving reflected light from an inner surface of a package illuminated by the light source. The processor generates a random code according to the second output signal to modulate the light source, identifies whether to change an emission pattern of the light source according to a distance calculated according to the first output signal, and changes exposure intervals of the first pixel and the second pixel.

公开(公告)号：US20230288564A1

公开(公告)日：2023-09-14

申请号：US18198814

申请日：2023-05-17

Applicant: PixArt Imaging Inc.

Inventor： Yueh-Lin CHUNG ,  Tso-Sheng TSAI

IPC: G01S17/36 ,  G01S7/4915 ,  G01S7/4913 ,  G01S7/4911

CPC classification number: G01S17/36 ,  G01S7/4915 ,  G01S7/4913 ,  G01S7/4911

Abstract: There is provided a distance measurement device including a light source, a light detector, a time control circuit and a processor. In first measurement, the time control circuit controls the light source to illuminate at a low modulation frequency, and the processor calculates a rough flying time according to a first detection signal of the light detector to determine an operating phase zone and a delay time. In second measurement, the time control circuit controls the light source to illuminate at a high modulation frequency and causes a light driving signal of the light source and a detecting control signal of the light detector to have a difference of the delay time, and the processor calculates a fine flying time according to a second detection signal of the light detector.