Negative pixel compensation
First Claim
1. A method for compensating an acquired touch image for a negative pixel effect, the method comprising:
- determining at least one bound for a compensation factor based on one or more acquired touch image values, wherein the one or more touch image values represent data acquired from a touch sensor panel;
estimating the compensation factor within the determined bound based on the touch image values of the one or more touch image values that are negative, wherein the negative touch image values are indicative of a grounding condition of a user or object touching or in close proximity to a touch sensor panel and wherein the estimated compensation factor is a function of an estimated touch and grounding condition of a user or object touching or in close proximity to the touch sensor panel; and
applying the estimated compensation factor to the one or more touch image values.
1 Assignment
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Accused Products
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
13 Claims
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1. A method for compensating an acquired touch image for a negative pixel effect, the method comprising:
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determining at least one bound for a compensation factor based on one or more acquired touch image values, wherein the one or more touch image values represent data acquired from a touch sensor panel; estimating the compensation factor within the determined bound based on the touch image values of the one or more touch image values that are negative, wherein the negative touch image values are indicative of a grounding condition of a user or object touching or in close proximity to a touch sensor panel and wherein the estimated compensation factor is a function of an estimated touch and grounding condition of a user or object touching or in close proximity to the touch sensor panel; and applying the estimated compensation factor to the one or more touch image values. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A touch sensitive device comprising:
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a touch sensor panel comprising multiple touch locations for sensing a touch on the panel; and a processor in communication with the panel and configured to capture an image of the sensed touch wherein the image of the sensed touch includes one or touch image values, identify negative values of the one or more touch image values in the captured image, determine a bound of a compensation factor based on the identified negative values for adjusting the captured image, estimate the compensation factor within the determined bound based on the touch image values of the one or more touch image values that are negative, wherein the negative touch image values are indicative of a grounding condition of a user or object touching or in close proximity to a touch sensor panel and wherein the estimated compensation factor is a function of an estimated touch and grounding condition of a user or object touching or in close proximity to the touch sensor panel; and adjust the identified negative values to about zero using the estimated compensation factor. - View Dependent Claims (9, 10)
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11. A non-transitory computer readable storage medium having stored thereon a set of instructions for compensating for a negative pixel effect in a touch sensor panel, that when executed by a processor causes the processor to:
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determine a bound for a compensation factor based on one or more values of a touch image captured by the panel wherein the one or more touch image values represent data acquired from the touch sensor panel; estimate the compensation factor within the determined bound based on the touch image values of the one or more touch image values that are negative, wherein the negative touch image values are indicative of a grounding condition of a user or object touching or in close proximity to a touch sensor panel and wherein the estimated compensation factor is a function of an estimated touch and grounding condition of a user or object touching or in close proximity to the touch sensor panel; and apply the estimated compensation factor to the one or more touch image values to compensate for the negative pixel effect. - View Dependent Claims (12, 13)
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Specification