Provided herein may be a display device and a driving method thereof. The display device may include a pixel area including multiple pixels, a timing controller configured to generate a control signal based on an input image, a data driver configured to supply a data voltage to data lines coupled to the pixel area depending on the control signal, a scan driver configured to supply scan signals to scan lines coupled to the pixel area depending on the control signal, and a power manager configured to supply an initialization voltage for initializing the multiple pixels and a first supply voltage for driving the multiple pixels to the pixel area. The power manager senses a voltage change in the first supply voltage supplied to the pixel area, and changes the first supply voltage and supplies the same to the pixel area in order to compensate for the sensed voltage change.