Gamma voltage generating apparatus for display device

An apparatus for generating a gamma voltage of a display device including a display panel and a plurality of driving chips mounted on the display panel, each of the driving chips including a data driving part outputting a data signal to source lines of the display panel, the apparatus comprising:

• a plurality of gamma resistors formed in the driving chip and serially coupled between a power terminal and a ground terminal;
• output terminals, formed among the adjacent gamma resistances, for outputting gamma voltages;
• first and second output buffers, respectively connected to first and second output terminals outputting upper and lower gamma voltages having a first polarity among the output terminals, for buffering the upper and lower gamma voltages having the first polarity to output the upper and lower gamma voltages to the data driving part;
• and
• third and fourth output buffers, respectively connected to third and fourth output terminals outputting upper and lower gamma voltages having a second polarity among the output terminals, for buffering the upper and lower gamma voltages having the second polarity to output the upper and lower gamma voltages to the data driving part.

A display device including a display panel having source lines formed thereon, a plurality of driving chips mounted on the display panel and a printed circuit board connecting the display panel to an external device, the display device comprising:

• a plurality of gamma resistors, formed in each of the driving chips, serially coupled between a voltage terminal and a ground terminal, for distributing the power voltages to a plurality of gamma voltages;
• a stabilizing circuit part, mounted on the printed circuit board, for stabilizing the gamma voltages;
• and
• a data driving part, formed in the driving chip, for outputting a converted data signal based on the gamma voltages to a predetermined group of source lines.