Patent ID: 8717337

Claim:
A touch sensing liquid crystal display device comprising: a first substrate having a plurality of gate lines and data lines thereon; a second substrate comprising first, second and third color sub-pixel, the second substrate opposed to the first substrate; a first photo-sensor formed on the first substrate, corresponding to the first color sub-pixel; a second photo-sensor formed on the first substrate corresponding to one of the second and third color sub-pixels, wherein said color sub-pixel having the second photo-sensor is adjacent to first color sub-pixel; a liquid crystal layer formed between the first substrate and the second substrate; a wave guide formed on an external surface of the second substrate; a light emitting diode adjacent to the wave guide, wherein the light emitting diode is capable of emitting light of the same color corresponding to a first color of the first color sub-pixel; and a backlight unit under the first substrate, wherein light emitted from the light emitting diode is reflected at the wave guide when the wave guide is touched and wherein the first photo-sensor senses the reflected light through the first color sub-pixel while the second and the third color sub-pixels absorb the reflected light.