3D imaging image sensor pixel circuit based on TOF

• Main Authors: MA WEIJIAN, MO YAOWU, XIE XIAO, SHAO ZEXU, XU CHEN, REN GUANJING, ZHANG ZHENGMIN, GAO ZHE
• Format: Patent
• Language: Chinese; English
• Published: 10.12.2019
• Subjects: ANALOGOUS ARRANGEMENTS USING OTHER WAVES; BASIC ELECTRIC ELEMENTS; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES; MEASURING; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION; RADIO DIRECTION-FINDING; RADIO NAVIGATION; SEMICONDUCTOR DEVICES; TESTING

The invention provides a 3D imaging image sensor pixel circuit based on TOF. The pixel circuit comprises a photosensitive control unit, a photoelectric control unit, a first reading circuit and a second reading circuit. The first reading circuit and the second reading circuit are symmetrical circuits. The photosensitive control unit comprises a photodiode and a plurality of transmission transistors, and the plurality of transmission transistors are respectively connected to the photodiode. The photoelectric control unit includes one or more control transistors. The first reading circuit and the second reading circuit respectively comprise a reset transistor, a gain control unit, a signal storage control unit and a first output unit. The first reading circuit and the second reading circuitrespectively comprise a global exposure transmission unit, and each global exposure transmission unit comprises a global exposure storage unit and a second output unit. The invention further providesa distance measuring syste