Negative pixel compensation
First Claim
1. A method for compensating a touch image for a negative pixel effect, the method comprising:
- acquiring a touch image from a touch sensor panel;
analyzing negative pixel values, indicative of a grounding condition of an object touching or in close proximity to the touch sensor panel, of the touch image to determine a compensation factor;
applying the determined compensation factor to the touch image to produce a compensated image absent substantially all the negative pixel values, wherein the compensation factor is based on the acquired touch image and the grounding condition; and
selectively scaling the compensated image or the touch image to provide image display consistency.
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Abstract
Negative pixel compensation in a touch sensor panel is disclosed. A method can compensate for a negative pixel effect in touch signal outputs due to poor grounding of an object touching the panel. To do so, the method can include determining at least one bound for a negative pixel compensation factor based on touch signal values, estimating the compensation factor within the determined bound based on the touch signal values that are negative, where the negative values indicate the presence of the negative pixel effect, and applying the estimated compensation factor to the touch signal outputs to compensate the touch signal values for the negative pixel effect.
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Citations
6 Claims
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1. A method for compensating a touch image for a negative pixel effect, the method comprising:
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acquiring a touch image from a touch sensor panel; analyzing negative pixel values, indicative of a grounding condition of an object touching or in close proximity to the touch sensor panel, of the touch image to determine a compensation factor; applying the determined compensation factor to the touch image to produce a compensated image absent substantially all the negative pixel values, wherein the compensation factor is based on the acquired touch image and the grounding condition; and selectively scaling the compensated image or the touch image to provide image display consistency. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification