Patent ID: 8542197

Claim:
A display apparatus comprising: a display panel which comprises a light emitting device; a sensor which senses an electric current flowing in the light emitting device; and a controller which controls the display panel to display user interface (UI) information on a predetermined region of the display panel to induce and receive an external stimulus at the predetermined region of the display panel according to the displayed UI information, determines that the external stimulus occurs to the display panel if a change of the sensed electric current flowing in the light emitting device exceeds a preset current change rate, and performs an operation based on a determination result, wherein the light emitting device comprises an organic light emitting material, wherein while the UI information is displayed, the controller prevents supplying electric current flows to the light emitting device of another region of the display panel where the UI information is not displayed so that the controller does not determine the external stimulus on the another region.