Display to touch crosstalk compensation
First Claim
1. 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.
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Accused Products
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.
43 Citations
22 Claims
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1. A method of compensating for crosstalk generated in a touch sensitive display, the method comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A touch sensitive display comprising:
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an active area including pixels having display components including gates for displaying data during a display mode and touch components for sensing a touching or hovering object during a touch sensing mode; a gate driver configured to drive the gates of the display components with gate voltage levels for displaying data during the display mode; the gate drive configured to drive the gates of the display components with multiple different gate voltage levels during the touch sensing mode, the multiple different voltage levels being different from the gate voltage levels for displaying data during the display mode and the multiple different voltage levels effective for inhibiting a display function of the display; and a display controller configured to control adjustment of the multiple different gate voltage levels so as to compensate for crosstalk introduced by the display components during the touch sensing mode. - View Dependent Claims (10, 11, 12, 13)
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14. A method of compensating for crosstalk in a touch sensitive display, the method comprising:
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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. - View Dependent Claims (15, 16, 17, 18)
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19. A touch sensitive display comprising:
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a display pixel having a gate line; a circuit coupled to the gate line to transmit display voltage levels to the pixel during a display mode; the circuit operative to transmit multiple different voltage levels to the gate line during a touch mode of the display, the multiple different voltage levels being different from the display voltage levels, and each operative to inhibit a display function of the display pixel; and logic for adjusting the multiple different voltage levels to the gate line during the touch mode so as to compensate for crosstalk introduced into the display; a stimulation voltage source configured to drive touch components with a stimulation voltage to generate an output, the output having the crosstalk therein; and a demodulator configured to reject the crosstalk and otherwise retain the output. - View Dependent Claims (20, 21, 22)
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Specification