A display panel includes: a base substrate; a circuit layer on the base substrate; and a display element layer on the circuit layer, wherein the circuit layer includes an active layer on the base substrate and containing boron and fluorine; a control electrode on the active layer; and a control electrode insulation layer between the active layer and the control electrode, wherein the active layer includes: a core layer in which a concentration of the boron is greater than a concentration of the fluorine; and a surface layer on the core layer and in which a concentration of the fluorine is greater than a concentration of the boron.