Provided is a liquid crystal display device. The liquid crystal display device includes: a first substrate and a second substrate each having a display area and a non-display area defined; a liquid crystal layer between the first and second substrates; a light sensor on the first substrate in the non-display area that senses the intensity of external light; a passivation layer on an entire upper surface of the first substrate including the light sensor; and a dummy electrode on the passivation layer at a location corresponding to the light sensor.