A coating composition includes a glass frit including P 2 O 5 , SiO 2 , B 2 O 3 , a group I-based metal oxide, BaO, NaF, TiO2, SnO, ZnO, and an adhesion enhancement component, the P 2 O 5 is included by 40 wt% to 55 wt% based on a total weight of the glass frit, the SiO 2 is included by 5 wt% to 15 wt% based on the total weight of the glass frit, the B 2 O 3 is included by 5 wt% to 10 wt% based on the total weight of the glass frit, the group I-based metal oxide is included by 3 wt% to 10 wt% based on the total weight of the glass frit, the ZnO is included by 10 wt% to 25 wt% based on the total weight of the glass frit, and the TiO 2 is included by 0.1 wt% to 5 wt% based on the total weight of the glass frit.