A transflective type liquid crystal display device includes a first substrate having a pixel region, the pixel region including a transmission region and a reflection region that has a reflector formed thereon; a second substrate, which faces the first substrate, and on which a light guiding layer and a color filter layer are formed, the light guiding layer including a first medium and a second medium, a refractive index of the first medium and a refractive index of the second medium being different from each other; a liquid crystal layer interposed between the first and the second substrates; and a backlight assembly positioned outside of the first substrate to provide light onto the first medium in a reflection mode.