A display apparatus and a sub-pixel conversion method are provided; wherein, when sub-pixel conversion is performed on a first color, a second color, and a third color sequentially during a kth horizontal period, the third color, the first color, and the second color are described as performing sub-pixel conversion during a (k+1)th horizontal period.; therefore, the number of conversions can be reduced, and display defects caused by sub-pixel conversion can be reduced by making the number of sub-pixel conversions of the respective colors equal.