US 12,143,739 B2
Image sensor including pixel array
Yunhong Kim, Seoul (KR); Yunhwan Jung, Hwaseong-si (KR); Heesung Chae, Seoul (KR); Mooyoung Kim, Suwon-si (KR); and Haesick Sul, Hwaseong-si (KR)
Assigned to Samsung Electronics Co., Ltd., Gyeonggi-Do (KR)
Filed by Samsung Electronics Co., Ltd., Suwon-si (KR)
Filed on Jul. 5, 2022, as Appl. No. 17/857,812.
Claims priority of application No. 10-2021-0090545 (KR), filed on Jul. 9, 2021.
Prior Publication US 2023/0011310 A1, Jan. 12, 2023
Int. Cl. H04N 25/75 (2023.01); H04N 25/63 (2023.01); H04N 25/633 (2023.01)
CPC H04N 25/75 (2023.01) [H04N 25/63 (2023.01); H04N 25/633 (2023.01)] 20 Claims
OG exemplary drawing
 
1. An image sensor comprising:
a pixel array including an active pixel and an optical black pixel, the active pixel configured to generate a first pixel signal, and the optical black pixel configured to generate a second pixel signal;
a first biasing circuit configured to bias the first pixel signal based on a first bias voltage;
a first analog-to-digital converter configured to convert the biased first pixel signal into a first digital signal;
a second biasing circuit configured to bias the second pixel signal based on a second bias voltage, a value of the second bias voltage being different than a value of the first bias voltage; and
a second analog-to-digital converter configured to convert the biased second pixel signal into a second digital signal.