Patent ID: 8243000

Claim:
A data driver IC for a liquid crystal display, comprising: a latch circuit latching digital data; a digital-to-analog converter converting an output of the latch circuit into an analog video signal; and a plurality of analog amplifiers amplifying the analog video signal converted in the digital-to-analog converter, wherein the analog amplifiers are cascade-connected to each other, wherein each of the analog amplifiers comprises: a NAND gate formed of a polysilicon and having two input terminals that are connected to each other, such that the same analog video signal is input on both of the terminals; a capacitor connected to any one of the input terminals of the NAND gate; and a switch connecting the two input terminals and an output terminal of the NAND gate, such that an output signal from the NAND gate is fed back to both of the two input terminals through an operation of the switch, wherein when the switch is closed to initialize the input and the output terminals of the NAND gate to an intermediate potential of a power supply voltage that is applied to the NAND gate, an initialized voltage is stored in the capacitor, and then a voltage corresponding to a difference between a voltage of an analog video signal supplied to the capacitor and the initialized voltage is output to a data line through the output terminal, wherein the output signal is an amplified value of the analog video signal that is converted in the digital-to analog converter and is stabilized to a RC delay of the data line, and wherein the output signal is monitored and fed back to the analog video signal that is converted in the digital-to analog converter.