FULL SCALE CALIBRATION MEASUREMENT FOR MULTI-TOUCH SURFACES
First Claim
1. A method for normalizing sensor output values in a sensor panel, comprising:
- determining a region of the sensor panel associated with each of a plurality of sensor output values, each region containing a plurality of sensors; and
applying offset adjustment values and gain multiplication factors to the sensor output values to generate normalized sensor output values, the applied gain multiplication factor for each sensor output value selected in accordance with the region associated with that sensor output value;
wherein, for each region, the gain multiplication factor associated with that region is applied to the output values obtained from the sensors associated with that region.
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Abstract
Normalization of regions of a sensor panel capable of detecting multi-touch events, or a sensor panel capable of detecting multi-hover events, is disclosed to enable each sensor in the sensor panel to trigger a virtual button in a similar manner, given the same amount of touch or hover. Each sensor produces an output value proportional to the level or amount of touch or hover. However, due to processing, manufacturing and physical design differences, the sensor output values can vary from region to region or panel to panel for a given amount of touch or hover. To normalize the sensor output values across regions, gain and offset information can be obtained in advance, stored in nonvolatile memory, and later used to normalize the sensor output values so that all regions in the sensor panel can trigger virtual buttons similarly, providing a uniform “response function” at any location on the sensor panel.
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Citations
20 Claims
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1. A method for normalizing sensor output values in a sensor panel, comprising:
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determining a region of the sensor panel associated with each of a plurality of sensor output values, each region containing a plurality of sensors; and applying offset adjustment values and gain multiplication factors to the sensor output values to generate normalized sensor output values, the applied gain multiplication factor for each sensor output value selected in accordance with the region associated with that sensor output value; wherein, for each region, the gain multiplication factor associated with that region is applied to the output values obtained from the sensors associated with that region. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for normalizing sensor output values in a sensor panel, comprising:
a panel processor programmed for determining a region of the sensor panel associated with each of a plurality of sensor output values, each region containing a plurality of sensors, and applying offset adjustment values and gain multiplication factors to the sensor output values to generate normalized sensor output values, the applied gain multiplication factor for each sensor output value selected in accordance with the region associated with that sensor output value, wherein, for each region, the gain multiplication factor associated with that region is applied to the output values obtained from the sensors associated with that region. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. An apparatus for normalizing sensor output values in a sensor panel, comprising:
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means for determining a region of the sensor panel associated with each of a plurality of sensor output values, each region containing a plurality of sensors; and means for applying offset adjustment values and gain multiplication factors to the sensor output values to generate normalized output values, the applied gain multiplication factor for each sensor output value selected in accordance with the region associated with that sensor output value; wherein, for each region, the gain multiplication factor associated with that region is applied to the output values obtained from the sensors associated with that region. - View Dependent Claims (18)
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19. A non-transitory computer-readable storage medium comprising program code for normalizing sensor output values in a sensor panel, the program code for causing performance of a method comprising:
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determining a region of the sensor panel associated with each of a plurality of sensor output values, each region containing a plurality of sensors; and applying offset adjustment values and gain multiplication factors to the sensor output values to generate normalized sensor output values, the applied gain multiplication factor for each sensor output value selected in accordance with the region associated with that sensor output value; wherein, for each region, the gain multiplication factor associated with that region is applied to the output values obtained from the sensors associated with that region. - View Dependent Claims (20)
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Specification