NEGATIVE PIXEL COMPENSATION
First Claim
1. A method of compensating for a negative pixel effect on a touch sensor panel, comprising:
- computing a predicted negative pixel value for pixels on the touch sensor panel; and
compensating the pixels by adding a scaled first function of the predicted negative pixel values to raw pixel touch output values.
2 Assignments
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Accused Products
Abstract
Compensation of pixels that generate erroneous readings (so-called “negative pixels”), produced when multiple touch events are generated by the same poorly grounded object on a touch sensor panel is disclosed. To minimize negative pixels, a thicker cover material and/or a lower dielectric constant can be used. Alternatively, narrower drive and sense lines can be employed. To compensate for negative pixels, a predicted negative pixel value can be computed as an indicator of pixels that are likely to be distorted. The negative pixel value for any particular pixel can be computing by summing up the touch output values for pixels in the drive line of that pixel, summing up the touch output values for pixels in the sense line of that pixel, and then multiplying these two sums. The predicted negative pixel value is added to the measured touch output value for the pixel to compensate for artificially negative readings.
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Citations
27 Claims
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1. A method of compensating for a negative pixel effect on a touch sensor panel, comprising:
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computing a predicted negative pixel value for pixels on the touch sensor panel; and compensating the pixels by adding a scaled first function of the predicted negative pixel values to raw pixel touch output values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus for compensating for a negative pixel effect, comprising:
a processor programmed for computing a predicted negative pixel value for pixels on the touch sensor panel, and compensating the pixels by adding a scaled first function of the predicted negative pixel values to raw pixel touch output values. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A computer-readable medium comprising program code for compensating for a negative pixel effect on a touch sensor panel, the program code for causing performance of a method comprising:
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computing a predicted negative pixel value for pixels on the touch sensor panel; and compensating the pixels by adding a scaled first function of the predicted negative pixel values to raw pixel touch output values. - View Dependent Claims (23, 24, 25)
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26. A mobile telephone including an apparatus for compensating for a negative pixel effect, the apparatus comprising:
a processor programmed for computing a predicted negative pixel value for pixels on the touch sensor panel, and compensating the pixels by adding a scaled first function of the predicted negative pixel values to raw pixel touch output values.
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27. A digital audio player including an apparatus for compensating for a negative pixel effect, the apparatus comprising:
a processor programmed for computing a predicted negative pixel value for pixels on the touch sensor panel, and compensating the pixels by adding a scaled first function of the predicted negative pixel values to raw pixel touch output values.
Specification