Automotive 3 um HDR Image Sensor With LFM and Distance Functionality

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LATEST automotive image sensors are addressing challenging street scenarios with flickering LEDs and high dynamic range (HDR). Classical multiexposure image sensor architecture [1] was developed and HDR reached in excess of 140 dB [2] with junction temperatures up to +125 C. Image sensor architectures addressing both HDR and LED flicker mitigation (LFM) were developed using pulsed pixel operation [3] and split-diode pixel architectures [4]–[6]. These solutions achieved good LFM capabilities but resulted in reduced image quality, especially at high automotive temperatures. Earlier concept of lateral overflow integrating capacitor (LOFIC) architecture [7], [8] was significantly changed and modified for automotive use [9], [10] providing high-performance HDR with LFM even at high automotive temperatures. These new automotive image sensors are powering the latest advancements in autonomous and assisted driving as well as better viewing applications such as surround and rear view, e-mirror, digital video recording, and augmented reality displaying. Some applications also require fused image and distance data using the same camera solutions.

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