公开(公告)号：US20240223919A1

公开(公告)日：2024-07-04

申请号：US18531154

申请日：2023-12-06

Applicant: Meta Platforms Technologies, LLC

Inventor： Song Chen ,  Xinqiao Liu ,  Tsung-Hsun Tsai ,  Qing Chao ,  Michael Hall ,  David Maurice Moore ,  Sharvil Shailesh Talati

IPC: H04N25/616 ,  H04N25/131 ,  H04N25/53 ,  H04N25/67 ,  H04N25/771

CPC classification number: H04N25/616 ,  H04N25/131 ,  H04N25/53 ,  H04N25/67 ,  H04N25/771

Abstract: Systems and methods of the present disclosure include a digital image sensor pixel configured to perform digital correlated double-sampling (D-CDS) operations to compensate for fixed pattern noise (FPN) induced by comparator propagation delay variation across a digital pixel array. The pixel and D-CDS operations also support quantization of incident light using two pixel memory banks. The pixel includes data retention logic coupled to selectively lock and unlock the output of a comparator. The output of the comparator is combined with memory bank write enable signals to convert photodiode charge into digital pixel values stored in the two memory banks. The digital pixel values stored in the memory banks may be added or subtracted to generate an FPN compensated digital pixel value.