Ambient light detection device

摘要

An ambient light detection device for use with a liquid crystal display having an array of liquid crystal cells, each liquid crystal cell (20) having at least one transistor for selectively connecting that liquid crystal cell to a signal line and each transistor having a gate connected to a gate line and having a gate supply line (Vss3) selectively connectable to the gate line for turning off the gates. The device includes a current measuring circuit (60) configured to measure the current flowing in the gate supply line as a result of gate leakage current in the gates to which the gate supply line is connected and a controller (70) connected to the measuring circuit and configured to calculate, from the measured current, the level of ambient light reaching the gates.