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Anambient light sensor is a component insmartphones,notebooks, othermobile devices, automotive displays andLCD TVs. It is aphotodetector that is used to sense the amount ofambient light present, and appropriately dim the device'sscreen to match it. This avoids having the screen be too bright when the user'spupils are adapted for vision in a dark room, or too dim when the device is used outdoors in the daytime. Dimming the screen on a mobile device also prolongs the lifetime of thebattery. Some ambient light sensors are also capable to detect ambient color.
The standard international unit for theilluminance of ambient light is thelux. The typical performance of an ambient light sensor is from less than 50 lux in dim light to over 10,000 lux at noon.[1]
There are three common types of ambient light sensor:phototransistors,photodiodes, andphotonic integrated circuits, which integrate a photodetector and anamplifier in one device.
By the end of 2004, about 30% of phones sold inEurope had ambient light sensors,[2] while in 2016, 85% had a built-in ambient light sensor.[citation needed]