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Fabrication of Flexible Image Sensor Based on Lateral NIPIN Phototransistors

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Automotive 2.1 μm Full-Depth Deep Trench Isolation CMOS Image Sensor with a 120 dB Single-Exposure Dynamic Range.

Dongsuk Yoo¹, Youngtae Jang¹, Youngchan Kim¹

¹Samsung Electronics Co., Ltd., Yongin-si 17113, Republic of Korea.

Sensors (Basel, Switzerland)

|November 25, 2023

Summary

This summary is machine-generated.

A new automotive CMOS image sensor achieves 120 dB dynamic range using a unique sub-pixel design. This advanced sensor offers low noise and high capacity for superior high dynamic range (HDR) imaging in vehicles.

Keywords:

F-DTI HDR LFM automotive sub-pixel structure

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Area of Science:

Electrical Engineering
Computer Vision
Materials Science

Background:

Automotive image sensors require high dynamic range (HDR) for challenging lighting conditions.
Traditional sensors struggle with simultaneous capture of bright and dark scene details.
Deep trench isolation and advanced readout circuits are key to sensor performance.

Purpose of the Study:

To develop an automotive 2.1 μm CMOS image sensor with enhanced dynamic range.
To improve HDR imaging capabilities for automotive applications.
To achieve high signal-to-noise ratio (SNR) in synthesized HDR images.

Main Methods:

Implementation of a full-depth deep trench isolation.
Development of an advanced readout circuit technology.
Utilization of a sub-pixel structure with large and small photodiodes, in-pixel storage capacitors, and lateral overflow.

Main Results:

Achieved a 120 dB dynamic range at 85 °C with a sensitivity ratio of 10.
Realized low random noise (0.83 e-) and high overflow capacity (210 ke-).
Attained over 25 dB SNR during HDR image synthesis by increasing photodiode full-well capacity and suppressing leakage current at 105 °C.

Conclusions:

The developed automotive CMOS image sensor effectively achieves high dynamic range and low noise.
The sub-pixel structure and advanced circuit technology are crucial for superior HDR performance in automotive imaging.
This sensor technology enables robust image capture across diverse and challenging automotive environments.