D/A conversion circuit and semiconductor device

摘要

A D/A conversion circuit in accordance with the present invention, which is provided with a switch swD, allows a writing operation of a voltage (a true gradation voltage) to be performed at a higher speed by first applying a first voltage (a voltage close to the true gradation voltage), which is supplied without passing through a resistor element, to an output line and then applying a second voltage (the true gradation voltage), which is supplied via the resistor element, to the output line. Thus, the present invention can provide a D/A conversion circuit capable of writing display data to liquid crystal cells with higher precision at higher speed, and a semiconductor device utilizing such a D/A conversion circuit.

主权项

1. A semiconductor device comprising:
a driver circuit comprising:
a first latch circuit;a second latch circuit;a third latch circuit;a fourth latch circuit;a first D/A conversion circuit;a second D/A conversion circuit; anda buffer circuit, wherein the first latch circuit, the second latch circuit, the first D/A conversion circuit and the second D/A conversion circuit are connected in series, wherein the third latch circuit, the fourth latch circuit and the second D/A conversion circuit are connected in series, wherein the second D/A conversion circuit is a resistor string D/A conversion circuit, wherein the first D/A conversion circuit is configured to output a first voltage and a second voltage and to supply the first voltage and the second voltage to the second D/A conversion circuit, wherein the second D/A conversion circuit is configured to output a third voltage to the buffer circuit, and wherein the driver circuit is configured to output the first voltage to the buffer circuit just before the third voltage is outputted to the buffer circuit.