Samsung ISOCELL Vizion presentation at ISSCC 2021 details the company iToF approach: "7.1 - A 4-tap 3.5μm 1.2Mpixel Indirect Time-of-Flight CMOS Image Sensor with Peak Current Mitigation and Multi-User Interference Cancellation" by Min-Sun Keel, Daeyun Kim, Yeomyung Kim, Myunghan Bae, Myoungoh Ki, Bumsik Chung, Sooho Son, Hoyong Lee, Heeyoung Jo, Seung-Chul Shin, Sunjoo Hong, Jaeil An, Yonghun Kwon, Sungyoung Seo, Sunghyuck Cho, Youngchan Kim, Young-Gu Jin, Youngsun Oh, Yitae Kim, JungChak Ahn, Kyoungmin Koh, and Yongin Park.
I'm not sure what 33D means in the presentation:
The "33D" probably has no special meanings. On Samsung's website https://www.samsung.com/semiconductor/minisite/isocell/ there are ISOCELL GN2, ISOCELL HM3, ISOCELL 33D, ISOCELL GM5.
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