LED Flicker Mitigation Technology for Automotive Use
Technology
Image Sensor for Automotive Use

LED Flicker Mitigation
Technology for Automotive Use

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Overview

By using LED flicker mitigation (LFM) technology for automotive use, it is possible to acquire high quality information by suppressing the flicker that occurs when imaging traffic lights and signs that use an LED light source.

Technical Features

Original design that does not saturate even after long exposure

The LED light sources used in traffic lights and signs, etc., are repeatedly turning ON and OFF at a frequency that cannot be detected by human eyes. When this is imaged with an image sensor, if the exposure time is shorter than this ON/OFF timing, then the image may be taken during the time when it is OFF, so it will not be possible to capture the LED light emission. There is also a risk that this leads to the lit state being mistakenly recognized as a flashing state.

Using an exposure time longer than the emission period makes it possible to capture an LED light source, but there is the problem that a pixel can become saturated in some situations and blowout may occur. On that point, steps have been taken on the Sony Semiconductor Solutions Corporation's automotive image sensors to ensure that pixel saturation will not occur even if the exposure time is longer than the LED emission period. This makes it possible to capture the LED light source each period to acquire a high quality image signal with no flicker.

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