A display device includes a display module and a color calibrator. The display module includes a first casing and a circuit board. The first casing has a positioning recess and an accommodating recess. The circuit board has a first electrical connecting portion. The circuit board is disposed corresponding to the positioning recess and the first electrical connecting portion is exposed from the positioning recess. The color calibrator includes a second casing, a second electrical connecting portion and a sensor. The second casing has a protruding portion. The color calibrator is selectively accommodated in the accommodating recess or connected to the positioning recess by the protruding portion. When the protruding portion of the color calibrator is connected to the positioning recess, the first electrical connecting portion is electrically connected to the second electrical connecting portion and the sensor faces a display area of the display module.