Abstract: Provided is a touch screen integrated digitizer including a three-axis magnetic force sensor and a magnetic pen, which measures a distribution and a change amount of a magnetic force vector, generated by moving the magnetic pen generating a magnetic force, to accurately sense a position of the magnetic pen which is moved on a touch screen. Since the digitizer for detecting position information of an external input unit is implemented with a magnetic force sensor installed at an internal edge of a display device, a separate digitizer panel is not provided, and thus, the display device is lightened and slimmed.