COMPENSATION METHOD FOR LIQUID CRYSTAL APPLYING VOLTAGE OF LIQUID CRYSTAL DISPLAY DEVICE, LIQUID CRYSTAL DISPLAY DEVICE AND VOLTAGE DETECTING METHOD OF ELECTRONIC DEVICE AND LIQUID CRYSTAL LAYER

摘要

PROBLEM TO BE SOLVED: To conduct a highly precise temperature compensation in a liquid crystal display device. ;SOLUTION: A current detecting circuit 141 detects a current i in the selection interval of a dummy scanning line. An integrating circuit is operated in accordance with control pulses P1 to P3, integrates the current i in the selection interval and computes a moving charge quantity Q. A comparison circuit 143 compares the quantity Q with a reference charge quantity Qref and generates an error signal S. A control signal generating circuit 144, based on the error signal S, generates a control signal CTL so that the quantities Qref and Q are made equal and supplies the signal CTL to a power supply circuit. The power supply circuit adjusts the value of a selection voltage based on the signal CTL and supplies the adjusted voltage a scanning signal driving circuit.;COPYRIGHT: (C)2000,JPO