US 9,310,916 B2 · Display to touch crosstalk compensation

Abstract

A touch sensitive display capable of compensating for crosstalk in the display is disclosed. Crosstalk in display components can be reduced, eliminated, or otherwise compensated for by reducing or eliminating parasitic capacitances that cause the crosstalk. To do so, gate voltages to the display components, such as thin film transistors (TFTs), that introduce the parasitic capacitances can be reduced or otherwise adjusted. In one approach, the gate voltage can be set at multiple different low levels to generate respective sets of touch signals having different amounts of crosstalk. The different crosstalk amounts can then be used to determine and compensate for the crosstalk in the touch signals. In another approach, gate voltage can be modulated between multiple different low levels to push crosstalk out of band with the generated touch signals. The out-of-band crosstalk can then be used to compensate for the crosstalk in the touch signals.

Claims22

Dependent claims

A method of compensating for crosstalk generated in a touch sensitive display, the method comprising:

applying first gate voltages to gates of display pixels, the first gate voltages having voltage levels operative for display data during a display mode of operation;
during a touch sensing mode of operation, performing multiple touch scans to generate multiple touch images,
the multiple touch images obtained by applying multiple different second gate voltage levels to the gates of the display pixels, the multiple different second gate voltage levels being different from the first gate voltage levels and each operative to inhibit a display function of the display pixels;
comparing the touch images to determine a crosstalk component introduced into the display;
and
subtracting the determined crosstalk component from at least one of the touch images to provide a crosstalk compensated touch image.

3 more elements

A method of compensating for crosstalk in a touch sensitive display, the method comprising:

driving a display pixel with a modulating voltage and a stimulation voltage to generate an output, the output having crosstalk therein, the display pixels including display components for displaying data and touch components for sensing a touching or hovering object, and wherein the driving includes;
driving the display components with the modulating voltage, the modulating voltage having a range of different voltage levels, the display components causing the crosstalk;
and
driving the touch components with the stimulation voltage, the touch components generating the output indicative of the touching or hovering object;
while driving the touch components with the stimulation voltage, applying multiple different sate voltage levels to gates of the display pixel, each of the multiple different gate voltage :levels operative to inhibit a display function of the display pixel;
demodulating the output to isolate the crosstalk therefrom;
determining a crosstalk compensation factor based on the isolated crosstalk;
and
applying the determined crosstalk compensation factor to the output to provide a crosstalk compensated output.

6 more elements

Dependencies are inferred from the claim text.

Display to touch crosstalk compensation

Life of this patent

Display to touch crosstalk compensation

Life of this patent

Abstract

Claims22