Disclosed are a peripheral light sensor and a liquid crystal display device using the same. The device includes: a peripheral light sensor including: one or more transistors each coupled between an output line and a ground power sources, and having a gate electrode coupled to the ground power source and a first electrode, a voltage value of the respective ground power source being less than a maximal voltage value supplied to the respective output line, wherein each of the transistors is configured to output to the respective outline line a peripheral light sensing signal corresponding to an intensity of a peripheral light.