Patent ID: 6127997
Filing Date: 2000-10-03
Classification: G09G

Abstract:
A driver in a liquid crystal display apparatus for receiving an input voltage and generating an output voltage to drive a data line, comprising:first and second power supply terminals;an input terminal for receiving said input voltage;an output terminal for generating said output voltage;first and second MOS transistors of the same conductivity type having a common gate connected to a drain of said first MOS transistor, said second MOS transistor having a source connected to said output terminal;a first switch connected between said input terminal and a source of said first MOS transistor;a second switch connected between said first power supply terminal and the drain of said first MOS transistor;a third switch connected between said first power supply terminal and a drain of said second MOS transistor; anda fourth switch connected between said second power supply terminal and said output terminal;said first and second switched being operated to bias a voltage at the gate of said second MOS transistor to a voltage shifted from said input voltage by a threshold voltage of said first MOS transistor;said third and fourth switches being operated to operate said second MOS transistor as a source follower, so that a voltage shifted from a voltage at the common gate of said first and second MOS transistors by a threshold voltage of said second MOS transistor is output as said output voltage at said output terminal.