Patent ID: 8730223

Claim:
A display device, comprising: a lower substrate including pixel electrodes; an upper substrate including a common electrode; and a gamma reference voltage generating unit for generating a plurality of gamma reference voltages in response to a gamma control signal; and a gamma signal supplying unit providing a gamma signal to data lines of the lower substrate of a display panel using the gamma reference voltages, wherein the gamma reference voltage generating unit is fabricated as a chip and mounted on an external printed circuit board physically separated from the lower substrate and electrically connected to the lower substrate, wherein the gamma signal supplying unit is located on the lower substrate and receives the plurality of gamma reference voltages from the gamma reference voltage generating unit located in the external printed circuit board, wherein the gamma reference voltage generating unit comprises: a gamma controller for supplying the gamma control signal; at least one voltage generator for outputting different gamma reference voltages based on a reference voltage and the gamma control signal; and at least one output buffer for outputting the plurality of gamma reference voltages, wherein the gamma signal supplying unit includes a digital to analog converter for performing a digital to analog conversion on digital pixel data into the gamma signal using the gamma reference voltages and outputting the gamma signal to the data lines.