Patent ID: 8355014
Filing Date: 2013-01-15
Classification: G01J,G09G

Abstract:
1. An ambient light detection device for use with a liquid crystal display having: an array of liquid crystal cells, each liquid cell 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 selectively connectable to the gate line for turning off the gates, the device including: a current measuring circuit electrically connected and configured to measure the current flowing in gate supply lines from a directly connected gate line as a result of all of the gate leakage currents in the gates connected to the gate line to which the gate supply lines are connected, wherein the gate leakage currents are outputted from the gate supply lines to the gate line; and a controller connected to the measuring circuit and configured to calculate, from the measured current, the level of ambient light reaching the gates.