Patent ID: 8547345
Filing Date: 2013-10-01
Classification: G06F

Abstract:
1. A liquid crystal display apparatus that includes a liquid crystal display panel, comprising: a column driver that transmits electrical voltage along a column line in the liquid crystal display apparatus directed at a particular sub-pixel, wherein the column driver is configured to output at least two successive voltage spikes of opposing polarities and a charging pulse on the column line directed to the particular sub-pixel; a sensor that is positioned electrically in parallel with the column line or in series with the column line that is configured to sense a sensed parameter when the column driver outputs the at least two successive voltage spikes on the column line; a receiver component that receives the sensed parameter of the column line; and an output component that outputs an indication that a member is in physical contact with the display panel based at least in part upon the received sensed parameter of the column line, wherein the sensed parameter of the column line corresponds to capacitance between conducting layers of the display panel at the particular sub-pixel, wherein a liquid crystal element is between the conducting layers of the display panel at the particular sub-pixel, and wherein the member being in physical contact with the display panel at a location corresponding to the particular sub-pixel alters the capacitance between the conducting layers of the display panel at the particular sub-pixel.