Patent ID: 8154504

Claim:
A liquid crystal display device comprising: a liquid crystal display panel including a first substrate divided into a display region and a non-display region including a first region and a second region, a liquid crystal layer, and a second substrate; a backlight unit disposed opposite a surface of the first substrate to emit light onto the liquid crystal display panel; a first sensor disposed in the first region to sense ambient light; and a second sensor disposed in the second region to sense light emitted from the backlight unit, wherein each of the first and second sensors includes a gate electrode, a semiconductor layer formed on the gate electrode and in which a current varies according to intensity of a light illuminated thereon and source and drain electrodes formed on the semiconductor layer, wherein a black matrix to block light is formed on the second substrate, the black matrix including an opening that corresponds to the first sensor to allow ambient light to be incident on the first sensor, the black matrix corresponding to the second sensor blocking the second sensor not to allow ambient light to be incident on the second sensor, and wherein the gate electrode of the second sensor includes an opening to allow light emitted by the backlight unit to be incident on the second sensor, wherein the gate electrode of the second sensor is directly contacted with the first substrate, the semiconductor layer of the second sensor is formed directly on the gate electrode and directly on the first substrate in an area corresponding to the opening of the gate electrode and the source electrodes and the drain electrodes of the second sensor are directly contacted with the semiconductor layer and the source electrodes and the drain electrodes are disposed in turns.