Turning the Spotlight on Ambient Light Sensors (.PDF Download)

Ambient light sensors (ALSs) are photodetectors that approximate the human eye’s response to light intensity under a variety of lighting conditions and through different attenuation materials. They’re most commonly found in industrial lighting, consumer electronics, and automotive systems. But they have seen increased usage in LCD-equipped portable products—especially smartphones—because an ALS IC can automatically control the brightness level of the display backlight.

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