Which part of a touchscreen responds to pressure applied to its surface?

Digitizer

Inverter

OLED panel

System board

Digitizer is used to respond the pressure applied to the surface of touch screen.

Explanation:

In cell phone or smartphone, a piece of glass is placed just behind the LCD to sense and respond the touch on the screen. When we touch or swipe the screen, an electrical screen is produced by applying pressure on LCD. The electrical signal is in analog form, digitizer convert this signal into digital signal. After conversion the signal has been processed and responded in the form of operation that we want to perform through touch screen.