Patent ID: 7728750

Claim:
A display panel driver, comprising: a binary-weighted current-type digital/analog converter receiving n input signals and outputting a digital/analog output voltage signal based on (2 n −1) times of a reference current, the converter comprising: an input stage comprising n NMOS transistors controlled by the n input signals and n reference current sources respectively generating 2 0 times of the reference current, 2 1 times of the reference current, . . . , 2 (n-2) times of the reference current and 2 (n-1) times of the reference current; a sum stage comprising a PMOS transistor summing all currents from the n reference current sources of the input stage to generate (2 n −1) times of the reference current; a transfer stage comprising a PMOS transistor transferring the (2 n −1) times of the reference current generated from the sum stage; and an output stage comprising a high-voltage NMOS transistor outputting the digital/analog output voltage signal based on the (2 n −1) times of the reference current from the transfer stage; and a current-mirror-type source follower receiving the digital/analog output voltage signal and outputting (2 n −1) times of the reference current with a current mirror effect thereof, so as to output an output voltage for driving the display panel.