An apparatus and method for data driving of AMOLED display panel using low voltage transistor

The data driving device for a display panel includes a reference current setting device, gradation display reference current generator, a plurality of current-to-voltage converter, and a plurality of line drivers. The reference current setting group set the display panel white balance level (white balance level) the reference current (reference current) in response to having a different current value in the (Display Panel). Gradation display reference current generator is responsive to the reference current to produce a plurality of respectively different gradation display reference current. A plurality of current-to-voltage converters in response to the white balance level of the current driving capability is variable, and generates a voltage corresponding to gray scale display by driving the single gray-scale display corresponding to the reference current of the plurality of gradation display reference current. A plurality of line drivers is the white balance in response to the level of the current driving capability is variable, a data line current corresponding to the generated plurality of gradation display voltages in response to a gray scale display voltage is selected by the display data drives. A data driving device for a display panel, the low-voltage transistor configured to be able to optimize the chip size.