Patent ID: 7616183

Claim:
A source driving circuit of a display device, comprising: a shift register configured to generate an n-bit first signal in response to a clock signal and an input/output control signal; a data latch circuit configured to sample video data using the first signal to latch the sampled video data, and configured to output 3.times.n digital signals; a D/A converter configured to generate a plurality of analog voltage signals corresponding to the 3.times.n digital signals using a plurality of gray scale voltages; and a sample-and-hold circuit configured to generate 6.times.n sample-and-hold signals using the analog voltage signals in response to a plurality of switching control signals, wherein n is a positive integer, wherein the sample-and-hold circuit comprises: a buffer circuit configured to buffer the analog voltage signals; a switching circuit configured to output the buffered signals of the buffer circuit in response to the switching control signals; and a storage circuit configured to store the output signals of the switching circuit, wherein the switching circuit comprises: a plurality of MOS transistors; and a plurality of MOS capacitors respectively coupled between the storage circuit and gates of the MOS transistors.