Abstract: A position sensing device for a display device includes an oscillator, a first and second electrode pair, a transparent conductive layer positioned on a display of the display device, first and second differential amplifiers, an amplifier and a processor. The first differential amplifier provides a first signal indicative of distance of the first electrode pair from the second body part of the operator in an x-direction. The output of the second differential amplifier provides a second signal indicative of distance of the second electrode pair from the second body part of the operator in a y-direction. The output of the amplifier provides a third signal indicative of distance of the transparent conductive layer from the second body part of the operator in a z-direction. The processor is operable to generate a three dimensional distance signal based on the output of the differential amplifiers and amplifier.

Abstract: A position sensing device having an insulating board, a first conductive sensing element, a second conductive sensing element, an oscillator, conductive material, a differential amplifier, and a processor. The first and second spaced conductive sensing elements are on the insulating board. The oscillator generates an oscillating signals and the conductive material is spaced from the sensing elements. The conductive material receives the oscillating signal to create an electric field between the conductive material and the first and second sensing elements. The differential amplifier includes differential inputs that are connected to the conductive sensing elements. The signal levels at the differential inputs vary based on the position of a pointing object of a user relative to the first and second conductive sensing elements. The processor generates a position signal based on an output of the differential amplifier.