Patent ID: 8339370

Claim:
A display device to sense an input point using magnetic fluid, the display device comprising: a touch panel part to receive a user input through a touch at an input point and to calculate a coordinate value of the input point; an electromagnet arrangement part comprising a plurality of electromagnets to generate a magnetic force on one or more electromagnets in a portion corresponding to the coordinate value; a magnetic fluid part to become magnetized at the portion corresponding to the coordinate value and to project in accordance with the generated magnetic force; and a control part to receive the calculated coordinate value, to determine the one or more electromagnets corresponding to the coordinate value in the electromagnet arrangement part, and to apply a voltage to the determined one or more electromagnets so that the one or more electromagnets generate the magnetic force, wherein the electromagnet arrangement part is an electromagnet array, wherein the electromagnet array is not substantially magnetized when the control part does not apply the voltage, and wherein the projected magnetic fluid part moves away from a plane of the display device in accordance with the generated magnetic force.