Patent ID: 8427448

Claim:
A liquid crystal display comprising: a liquid crystal display panel including a pixel array that displays an image and touch sensors that sense a touch position depending on an amount of receiving light; a first transparent conductive layer on one substrate of the liquid crystal display panel transmitting display light, the transparent conductive layer being connected to a ground level voltage source; a polarizing plate on the first transparent conductive layer; a second transparent conductive layer that is formed on the polarizing plate to be exposed to the outside, the first and second transparent conductive layers being on opposite sides of the polarizing plate; a driving voltage supply circuit to generate a driving voltage required to perform light sensing operations of the touch sensors during a touch period based on changes in an amount of surface charge of the second transparent conductive layer depending on whether or not the second transparent conductive layer is touched; and a signal transmitting unit to electrically connect the second transparent conductive layer to the driving voltage supply circuit, wherein when a user touches the second transparent conductive layer with his or her finger, the polarizing plate serves as a dielectric to form an equivalent capacitor between the first and second transparent conductive layers, and wherein the amount of surface charge of the second transparent conductive layer has a different value during touch and non-touch operations.