What is ambient light sensor of mobile?

What is an ambient light sensor on a monitor?

• Answer:

  Ambient light sensors are used to adjust the brightness of a monitor according to the brightness of the surrounding or ambient light. This saves power and also relieves eye strain for the viewer.How it WorksAmbient light sensors are made by a variety of different manufacturers but work on basically the same principle. They are able to detect the brightness or intensity of light surrounding the monitor. The brightness is converted to an electronic signal that is sent to the monitor to adjust its brightness.ComponentsAmbient light sensors consist of a filter to sample visible light, a photo diode for detection of brightness, a digital filter and a digital/analog converter. These components are etched on a single microchip platform.ElectronicsWhen light strikes a photodiode, electric current is generated. The brighter the light, the stronger the current. The ambient light detectors uses the electric signal from the photodiode to determine the brightness of the surrounding light. The signal is processed by the detector and sent as a signal to adjust the monitor's brightness.UsesThe sensors are built into monitors, laptops, LCDs, plasma TVs and other viewing devices. They are usually invisible or appear behind a tiny window on the front or top of the monitor.AdvantagesAutomatically adjusting the monitor brightness can save energy. The reduction of brightness in dark ambient lighting conditions also relieves eye strain and viewer fatigue.AdjustmentWhen you set the monitor at a comfortable light level for a given situation, the monitor will "remember" this level and adjust for higher or lower light conditions relative to your comfort level.Source:http://www.eetasia.com/ART_8800430830_480500_NP_8ec3b356.HTM