Patent ID: 8570468
Filing Date: 2013-10-29
Classification: G02F

Abstract:
1. A liquid crystal display device having a display area and a non-display area, comprising: a first substrate; a second substrate having a color filter and a black matrix; a liquid crystal layer interposed between the first substrate and the second substrate; a seal pattern attaching the first and second substrates; a light sensor formed on the first substrate in the non-display area to sense an intensity of an external light; and a backlight disposed on a rear side of the first substrate and having a brightness thereof controlled by the light sensor, wherein the light sensor includes a gate electrode formed on the first substrate, a gate insulating layer formed on the gate electrode, a semiconductor layer formed on and directly in contact with the gate insulation layer, source and drain electrodes formed on and directly in contact with the semiconductor layer, and a passivation layer formed on the source and drain electrodes, wherein the seal pattern is formed on the outermost peripheral edge of the display area to securely attach the first substrate and the second substrate, wherein the liquid crystal layer is disposed inside the seal pattern and is not disposed over the light sensor, wherein the light sensor is positioned outside the seal pattern, adjacent the black matrix, and exposed to an outside, wherein the drain electrode of the light sensor is connected with a light sensor pad and the light sensor pad is connected with a backlight driver to output a signal for controlling the brightness of the backlight, wherein the light sensor pad is formed of the same conductive material as the gate electrode or the source and drain electrodes and is formed of the same process as the gate electrode or the source and drain electrodes, wherein the second semiconductor layer comprises: wherein the light sensor is formed between the first substrate and the second substrate, and wherein the black matrix is formed on portions of the second substrate corresponding to both the non-display area and the display area.