Patent ID: 7652651

Claim:
An analog sampling apparatus of a liquid crystal display device, comprising: a data driver to generate an analog data voltage; a data output bus line to receive the analog data voltage; a first sampling and holding circuit connected to the data output bus line to compensate an offset voltage in the analog data voltage and to supply the analog data voltage to a data line of a liquid crystal display panel; a second sampling and holding circuit connected to the data output bus line arranged to sample the analog data voltage while the analog data voltage is supplied to the data line by the first sampling and holding circuit, a shift register to sequentially generate a sampling signal to sample the analog data voltage; and a timing controller to control the first and second sampling and holding circuits by generating a first control signal having a pulse width of one horizontal period and a period of two horizontal periods and a second control signal having an opposite phase to the first control signal, and to control the data driver and the shift register; a first AND gate to perform an AND operation of the sampling signal and the first control signal to input to the first sampling and holding circuit; and a second AND gate for performing an AND operation of the sampling signal and the second control signal to input to the second sampling and holding circuit, wherein the first sampling and holding circuit is arranged to supply the analog data voltage while the second sampling and holding circuit samples the analog data voltage, and to sample the analog data voltage while the second sampling and holding circuit supplies the analog data voltage.