The digitizer is the sensor layer that detects the precise location of a finger or stylus, converts that analog touch event into a digital signal, and passes the coordinates to the operating system. Without a functioning digitizer, the device would not respond to taps, swipes, or multi-touch gestures. An ambient-light sensor controls brightness, an accelerometer/gyroscope handles screen rotation, and an ADC in the audio subsystem converts microphone signals-none of these tasks are performed by the digitizer.
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