Patent ID: 6107980
Filing Date: 2000-08-22
Classification: G09G

Abstract:
An active matrix circuit for activating a liquid crystal display, comprising:a low output impedance amplifier having first and second MOS transistors each having a drain, source and gate wherein the drain of said first transistor is connected to a first supply voltage and the source of said second transistor is connected to a second supply voltage, and wherein the source of said first transistor and the drain of said second transistor are shared and together form an amplifier output node, and wherein the gate of said second transistor is connected to a third voltage having a value such that said second transistor is operated below threshold and wherein adjustments of said third voltage compensate for changes in operating temperature and for fabrication process variations of said active matrix circuit, and wherein the gate of said first transistor receives an input signal wherein an amplifier transfer function of said amplifier is substantially linear; andan input switch device providing said input signal to said first transistor of said amplifier.