Negative pixel compensation
First Claim
Patent Images
1. A method comprising:
- acquiring a touch image from a touch sensor panel;
reconstructing the acquired touch image from the touch sensor panel, wherein reconstructing the touch image includes adjusting one or more touch values of the acquired touch image for a negative pixel effect; and
compensating the acquired touch image for the negative pixel effect by computing a composite image, wherein the composite image is computed by weighting the acquired image, weighting the reconstructed touch image, and combining the weighted acquired image and weighted reconstructed image, wherein the weighting of the acquired image and the reconstructed image is based on a magnitude of the negative pixel effect.
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Abstract
Negative pixel compensation in a touch sensor panel is disclosed. The panel 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 panel can reconstruct a captured touch image to remove negative pixel values indicative of the negative pixel effect and compute a composite image from the captured image and the reconstructed image to replace the captured image. In addition or alternatively, the panel can reconstruct a captured touch image to remove negative pixel values indicative of the negative pixel effect and replace the captured image with the reconstructed image.
28 Citations
10 Claims
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1. A method comprising:
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acquiring a touch image from a touch sensor panel; reconstructing the acquired touch image from the touch sensor panel, wherein reconstructing the touch image includes adjusting one or more touch values of the acquired touch image for a negative pixel effect; and compensating the acquired touch image for the negative pixel effect by computing a composite image, wherein the composite image is computed by weighting the acquired image, weighting the reconstructed touch image, and combining the weighted acquired image and weighted reconstructed image, wherein the weighting of the acquired image and the reconstructed image is based on a magnitude of the negative pixel effect. - View Dependent Claims (2, 3)
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4. A touch sensor panel comprising:
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multiple pixels configured to generate a touch image; and a processor in communication with the pixels and configured to determine a negative pixel effect on the touch image, reconstruct the touch image, wherein reconstructing the touch image includes adjusting one or more touch values of the touch image for a negative pixel effect, and compute a composite touch image by combining weighted pixel values of the touch image with weighted pixel values of the reconstructed touch image, wherein the weighting of the touch image and the reconstructed touch image is based on a magnitude of the negative pixel effect. - View Dependent Claims (5, 6, 7, 8)
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9. 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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compute at least one parameter indicative of the negative pixel effect in the touch sensor panel; and compensate pixel values of a touch image generated by the touch sensor panel for the negative pixel effect by applying the computed parameter to the pixel values, wherein the parameter is an overcompensation ratio computed as a ratio of a sum of positive pixel values in a reconstructed image to a sum of positive pixel values in the touch image, the reconstructed image being formed from the touch image absent negative pixel values.
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10. 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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compute at least one parameter indicative of the negative pixel effect in the touch sensor panel; and compensate pixel values of a touch image generated by the touch sensor panel for the negative pixel effect by applying the computed parameter to the pixel values, wherein the parameter is a negative pixel ratio computed as a ratio of negative pixel values to positive pixel values in the touch image.
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Specification