HDR image sensor pixel structure with LED flicker attenuated and imaging system

• Main Authors: MA WEIJIAN, MO YAOWU, XIE XIAO, SHAO ZEXU, XU CHEN, REN GUANJING, ZHANG ZHENGMIN, SHI WENJIE, GAO ZHE
• Format: Patent
• Language: Chinese; English
• Published: 17.08.2018
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; PICTORIAL COMMUNICATION, e.g. TELEVISION

The invention discloses an HDR image sensor pixel structure with LED flicker attenuated and an imaging system. One end of a reset transistor of the pixel structure is coupled to a first voltage sourceand the other end thereof is coupled to a floating diffusion node through a dual conversion gain control unit, a large-area photodiode of the pixel structure is coupled to the floating diffusion nodethrough a first transmission transistor, one path of a small-area photodiode is coupled to the floating diffusion node or a node between the reset transistor and the dual conversion gain control unitthrough a rolling exposure transmission unit, and the other path of the small-area photodiode is coupled to the floating diffusion node through a global exposure transmission unit. The pixel structure adopts a large-area photodiode that exposes continuously to capture weak light information and a small-area photodiode that exposes intermittently to capture an LED light source signal (high-brightness signal), so that the pi