A digitizer allows a user to draw on a computer by receiving input from a special surface. When the user presses against the surface, usually with a finger or stylus, the digitizer transforms the analog movements into digital information. This is useful for graphical input.
Touchscreen laptop screens can act as a digitizer. Laptop touchscreens generally work by monitoring the capacitance of a transparent charged conductive layer. When you finger comes into contact with the screen it acts as a conductor and changes the electric field.
A laptop can have a separate and discrete digitizer but most modern laptops fuse the digitizer with the display panel. If the digitizer is fused with the display panel, then you’ll need to replace the entire display panel to fix a faulty digitizer.
