Display to touch crosstalk compensation

摘要

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.

主权项

1. A method of compensating for crosstalk in a touch sensitive display, the touch sensitive display having display pixels for displaying data and touch components for sensing a touch or hover event, the method comprising:
during a touch sensing mode of operation, driving the touch components with a stimulation voltage, the touch components generating an output within a frequency band, the output indicative of the touch or hover event; during the touch sensing mode of operation, driving the display pixels with the varying voltage at a modulation frequency, the display pixels causing the crosstalk; wherein the modulation frequency is such as to push at least a portion of the crosstalk out of the frequency band of the output; 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.