Patent ID: 8159439

Claim:
A data driving circuit receiving an image signal and applying a data signal based on the image signal to a display panel, the data driving circuit comprising: a signal generator that generates a horizontal scanning identical signal based on the image signal and a load signal instructing an output of the data signal to the display panel, wherein the image signal comprises a reset signal indicating the start of the image signal, and the signal generator comprises a first operator that generates a flag signal based on the load signal and the reset signal and a second operator that generates the horizontal scanning identical signal based on the flag signal and the reset signal, wherein the flag signal rises at a rising edge of the load signal and falls at a falling edge of the reset signal; a signal amplifier that alternately converts a polarity of an offset compensation value from positive to negative and amplifies the image signal based on the offset compensation value; and a controller that counts pulses of the horizontal scanning identical signal and controls the signal amplifier to retain the converted polarity of the offset compensation value until a counted value reaches a predetermined reference value.