Patent ID: 8355006
Filing Date: 2013-01-15
Classification: G02F,G06F

Abstract:
1. 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 transparent conductive layer on one substrate of the liquid crystal display panel transmitting display light, a portion of the transparent conductive layer being connected to a ground level voltage source; a polarizing plate on the transparent conductive layer; 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 transparent conductive layer depending on whether or not the polarizing plate is touched; and a signal transmitting unit to electrically connect the transparent conductive layer to the driving voltage supply circuit, wherein when a user touches the polarizing plate with his or her finger, the polarizing plate serves as a dielectric to form an equivalent capacitor between the user's finger and the transparent conductive layer, and wherein the amount of surface charge of the transparent conductive layer has a different value during touch and non-touch operations.