Detecting touch on a surface
First Claim
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1. An apparatus comprising:
- a touch sensor comprising an array of sensor elements arranged in a plurality of rows and a plurality of columns; and
a controller configured to,in response to a multi-touch input comprising a plurality of touches made on the touch sensor, detect touch locations of the multi-touch input based upon capacitance measurements from each row in the plurality of rows to each column in the plurality of columns;
while the multi-touch input remains unchanged, detect the touch locations based on capacitance measurements from each row to ground in the plurality of rows and from each column to ground in the plurality of columns; and
in response to a change in the multi-touch input, detect the touch locations of the multi-touch input based on capacitance measurements from each row in the plurality of rows to each column in the plurality of columns.
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Abstract
Embodiments are disclosed herein that are related to input devices with curved multi-touch surfaces. One disclosed embodiment comprises a touch-sensitive input device having a curved geometric feature comprising a touch sensor, the touch sensor comprising an array of sensor elements integrated into the curved geometric feature and being configured to detect a location of a touch made on a surface of the curved geometric feature.
76 Citations
20 Claims
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1. An apparatus comprising:
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a touch sensor comprising an array of sensor elements arranged in a plurality of rows and a plurality of columns; and a controller configured to, in response to a multi-touch input comprising a plurality of touches made on the touch sensor, detect touch locations of the multi-touch input based upon capacitance measurements from each row in the plurality of rows to each column in the plurality of columns; while the multi-touch input remains unchanged, detect the touch locations based on capacitance measurements from each row to ground in the plurality of rows and from each column to ground in the plurality of columns; and in response to a change in the multi-touch input, detect the touch locations of the multi-touch input based on capacitance measurements from each row in the plurality of rows to each column in the plurality of columns. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An apparatus, comprising:
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a capacitive multi-touch sensor comprising a plurality of pixels each being configured to detect touch at a location over the pixel, wherein the capacitive multi-touch sensor comprises an array of sensor elements, where the array of sensor elements comprises m rows of row sensors and n columns of column sensors; and a controller configured to detect a location of a touch via the touch sensor by, upon detection of a multi-touch input comprising a plurality of touches, acquiring one or more m×
n capacitance measurements from the array of sensor elements, wherein the one or more m×
n capacitance measurements includes a capacitance measurement from each row in the m rows of row sensors to each column in the n columns of column sensors,then acquiring a plurality of m+n capacitance measurements from the array of sensor elements in response to an unchanging touch state of the multi-touch input, where the plurality of m+n capacitance measurements includes a capacitance measurement to ground for each row in the m rows of row sensors and each column in the n columns of column sensors, and in response to detecting a change in touch state of the multi-touch input, detect a location of a touch on the body by acquiring one or more m×
n capacitance measurements from the array of sensor elements. - View Dependent Claims (15)
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16. In a multi-touch computer input device comprising a capacitive multi-touch sensor array comprising m rows of row sensors and n columns of column sensors, and a pressure sensitive, variable resistance material in contact with one or more row sensors and one or more column sensors of the sensor array, a method of measuring a touch location and touch pressure, the method comprising:
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acquiring a first impedance measurement from the capacitive multi-touch sensor array at a first frequency, the first impedance measurement comprising an impedance value for each pixel of the sensor array; acquiring a second impedance measurement from the capacitive multi-touch sensor array at a second frequency, the second impedance measurement comprising an impedance value for each pixel of the sensor array, wherein the second frequency is different than the first frequency, and the capacitive multi-touch sensor array used to acquire the first impedance measurement being the same capacitive multi-touch sensor array used to acquire the second impedance measurement; from the first impedance measurement and the second impedance measurement, determining a resistance value and a capacitive reactance value; from the capacitive reactance value, determining a location of a touch; and from the resistance value, determining a touch pressure of the touch. - View Dependent Claims (17, 18, 19, 20)
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Specification