An organic light emitting diode (OLED) according to an embodiment can include an OLED panel; a printed circuit board adhered onto a rear surface of the OLED panel; and a back cover including first and second metal layers, an inorganic substance layer between the first and second metal layers, and a pocket groove in a horizontal surface on which the OLED panel is placed and corresponding to the printed circuit board, wherein the pocket groove is formed by removing the first metal layer corresponding thereto to expose the inorganic substance layer.