Organic light emitting diode display device and method of fabricating the same

In an organic light emitting diode (OLED) display device and a method for fabricating the same, OLED pixels are patterned through a photolithography process, so a large area patterning can be performed and a fine pitch can be obtained, and an organic compound layer can be protected by forming a buffer layer of a metal oxide on an upper portion of the organic compound layer or patterning the organic compound layer by using a cathode as a mask, improving device efficiency. In addition, among red, green, and blue pixels, two pixels (150a, 150b) are patterned through a lift-off process and the other remaining one (150c) is deposited to be formed without patterning, the process can be simplified and efficiency can be increased. Alternatively, on a first electrode first, second and third hole injection layers, hole transport layers, light emitting layers, electron transport layers, and buffer layers are formed and patterned by respective photo processes. A second electrode is formed on the first, second and third buffer layers which are made of metal oxide.