Patent ID: 8624821

Claim:
A liquid crystal display device comprising: a plurality of photo sensing devices formed on a TFT array substrate that sense an external light irradiated into a liquid crystal display panel, wherein the liquid crystal panel has a plurality of unit areas divided in a matrix form; a plurality of gate lines and a plurality of data lines crossing each other to define a plurality of pixel areas; a gate driver that sequentially provides a scan signal to the plurality of gate lines to select horizontal lines of the liquid crystal display device supplied with data signals; a first thin film transistor connected to the n th gate line and one of the data lines; an integrated circuit portion that reads out sensing signals corresponding to an illumination distribution by the external light in accordance with a sensing result by each of the photo sensing devices; a backlight having a plurality of light sources that independently supply light to the liquid crystal display panel in accordance with the illumination distribution of the plurality of unit areas; and a backlight driver that drives the backlight, wherein the photo sensing device includes a sensor thin film transistor that senses an external light, a first driving voltage supply line that supplies a first driving voltage to the sensor thin film transistor, a second driving voltage supply line that supplies a second driving voltage to the sensor thin film transistor and a second storage capacitor that stores a signal voltage sensed by the sensor thin film transistor, wherein the photo sensing device further includes a second thin film transistor connected to the n−1 th gate line and a read-out line and supplying the sensing signal to the integrated circuit portion through the read-out line, wherein the scan signal is sequentially supplied to the second thin film transistor through the n−1 th gate line and the first thin film transistor through the n th gate line from the gate driver, wherein the n−1 th gate line and the n th gate line are commonly connected to the gate driver, wherein each of the light sources is arranged in the matrix form corresponding to each of the unit areas.