Patent ID: 8154497

Claim:
A driving apparatus for a display device comprising a plurality of pixels arranged in a matrix and the pixel including first and second sub-pixels spatially divided, the driving apparatus comprising: a memory for storing digital data on gray reference voltages; a controller for calling the digital data to output the digital data together with a clock signal and at least one selection signal; and a gray voltage generator formed of an integrated circuit to receive the digital data from the controller and to generate gray reference voltage sets; a data driver for receiving the gray reference voltage sets to generate a plurality of gray voltages and select gray voltages corresponding to image signals, wherein the gray voltage generator comprises: first and second registers for storing the digital data for the first and second sub-pixels, respectively, wherein each of the digital data for the first sub-pixel and the digital data for the second sub-pixel comprises both of a value to be converted to positive gray reference voltages and a value to be converted to negative gray reference voltages for common voltage Vcom; a selector including a plurality of multiplexers for receiving outputs of the first and second registers, the multiplexers selecting one between the digital data for the first sub-pixel and the digital data for the second sub-pixel; and a converter including a plurality of digital-analog converters connected to the multiplexers.