ON Semi Paper on LED Flicker Mitigation in Automotive Sensor

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MDPI paper "Automotive 3.0 µm Pixel High Dynamic Range Sensor with LED Flicker Mitigation" by Minseok Oh, Sergey Velichko, Scott Johnson, Michael Guidash, Hung-Chih Chang, Daniel Tekleab, Bob Gravelle, Steve Nicholes, Maheedhar Suryadevara, Dave Collins, Rick Mauritzson, Lin Lin, Shaheen Amanullah, and Manuel Innocent is a part of Special issue on the 2019 International Image Sensor Workshop (IISW2019).

"We present and discuss parameters of a high dynamic range (HDR) image sensor with LED flicker mitigation (LFM) operating in automotive temperature range. The total SNR (SNR including dark fixed pattern noise), of the sensor is degraded by floating diffusion (FD) dark current (DC) and dark signal non-uniformity (DSNU). We present results of FD DC and DSNU reduction, to provide required SNR versus signal level at temperatures up to 120 °C. Additionally we discuss temperature dependencies of quantum efficiency (QE), sensitivity, color effects, and other pixel parameters for backside illuminated image sensors. Comparing +120 °C junction vs. room temperature, in visual range we measured a few relative percent increase, while in 940 nm band range we measured 1.46x increase in sensitivity. Measured change of sensitivity for visual bands—such as blue, green, and red colors—reflected some impact to captured image color accuracy that created slight image color tint at high temperature. The tint is, however, hard to detect visually and may be removed by auto white balancing and temperature adjusted color correction matrixes."

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