Patent ID: 8427436
Filing Date: 2013-04-23
Classification: G06F

Abstract:
1. A touch sensor configured to be disposed within a liquid crystal display panel, the touch sensor comprising: a plurality of x-axis read-out lines; a plurality of y-axis read-out lines crossing the x-axis read-out lines, wherein the x-axis read-out lines are insulated from the y-axis read-out lines; a plurality of sensor units provided in a plurality of regions defined by the x-axis read-out lines and the y-axis read-out lines, wherein each sensor unit comprises: a reset unit having a first transistor, wherein the first transistor comprising a control terminal receiving a first control signal, an input terminal receiving a first reset signal and an output terminal outputting the first reset signal based on the first control signal; a capacitance detector having a liquid crystal capacitor that changes the first reset signal based on a variation of a cell gap of the liquid crystal display panel caused by a touch event, wherein the output terminal of the first transistor is directly connected to a first electrode of the liquid crystal capacitor; a first output unit having a second transistor that changes an electric potential of a corresponding x-axis read-out line in response to the first reset signal changed in the liquid crystal capacitor; and a second output unit having a third transistor that changes an electric potential of a corresponding y-axis read-out line in response to the first reset signal changed in the liquid crystal capacitor; and a line reset unit comprising: a fourth transistor comprising a control terminal receiving the first control signal, an input terminal directly receiving a second reset signal, and an output terminal directly connected to one of the x-axis and y-axis read-out lines; and a first capacitor connected in parallel with the fourth transistor between the input and output terminals.