Patent ID: 8310435

Claim:
A liquid crystal display device comprising: a liquid crystal display panel including a first substrate having a display region and a non-display region, a liquid crystal layer, and a second substrate; a backlight unit opposite a surface of the first substrate that illuminates light onto the liquid crystal display panel; a plurality of gate lines arranged to cross a plurality of data lines on the first substrate; a switching device formed in intersection portions of the gate lines and the data lines, wherein the switching device is driven by a signal applied through the gate line; a plurality of first and second sensor lines substantially parallel to the data lines; a plurality of first sensors at crossings of the gate lines and the first sensor lines in a first region of the display region of the first substrate to sense ambient light; and a plurality of second sensors at crossings of the gate lines and the second sensor lines in a second region of the display region of the first substrate to sense light from the backlight unit, wherein the first sensors and the second sensors are formed on the gate line that is connected to the switching device, and wherein a black matrix blocking light is formed on the second substrate to exclude a portion of the second substrate that corresponds to the first sensors to allow ambient light to be incident on the first sensors, wherein each of the first and second sensors includes a gate electrode, a semiconductor layer formed on the gate electrode wherein a current flow amount changes according to intensity of light illuminated thereon and source and drain electrodes formed on the semiconductor layer, wherein a portion of a gate electrode of the second sensor includes an opening to expose the second sensor to light from the backlight unit, and wherein the semiconductor layer of the second sensor directly contacts the first substrate and the gate electrode in the opening.