A mobile device includes a housing; a flexible display positioned in the housing; an actuator coupled to the flexible display; an energy generation device coupled to the flexible display; a battery to receive current from the energy generation device in a charging mode; a processor; and a computer readable medium with computer-executable instruction stored thereon, that when executed by the processor cause the processor to initiate operations including: determining that charging mode has been entered; and generating a command signal to the actuator to create a protrusion on the flexible display in response to determining that charging mode has been entered.