A display panel including a display part including a plurality of sub-pixels configured to display a plurality of colors, and a plurality of data lines connected with the sub-pixels; a first test part configured to supply a test signal to (2K−1)th data lines (‘K’ is an integer above 0) by each color for the sub-pixels among the plurality of data lines; and a second test part configured to supply a test signal to 2Kth data lines by each color for the sub-pixels among the plurality of data lines when the first test part supplies the test signal. Further, a polarity of the test signal supplied by the second test part is opposite to a polarity of the test signal supplied by the first test part.