CAPACITIVE TOUCH SENSOR AND CAPACITIVE PEN
First Claim
Patent Images
1. A method for detecting an approach or a touch of a small area, comprising:
- obtaining an image of change in capacitive coupling from a capacitive touch sensor, wherein the capacitive touch sensor includes a plurality of driven conductive strips driven by a driving signal and a plurality of sensed conductive strips providing changes in capacitive coupling, each time the driving signal is provided, one or more intersections between one or more of the conductive strips being simultaneously driven by the driving signal and each sensed conductive strip generate capacitive coupling, and each value in the image of change in capacitive coupling is the change in capacitive coupling for one of the intersections;
detecting each detected intersection from the image of change in capacitive coupling, wherein the value of the detected intersection is smaller than a first threshold and larger than a second threshold;
detecting each first region, wherein each first region includes one of the detected intersections and an intersection adjacent to the detected intersection, and the sum of values of the first region is greater than the first threshold;
detecting each second region if no first region is detected, wherein each second region includes four adjacent intersections including one of the detected intersections, and the sum of values of the second region is greater than the first threshold; and
determining a first region or a second region approached or touched by an external conductive object when at least one first region or at least one second region is detected, wherein the values of all intersections adjacent to the first region or the second region approached or touched by the external conductive object are all smaller than a third threshold.
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Abstract
When a touch sensor is approached or touched by an object having a small area, the corresponding approach or touch signal might be slightly less than the threshold originally used for normal detection. By comparing the sum of the corresponding approach or touch signal and some adjacent signals with the threshold, the approach or touch of a small-area object that otherwise would not be detected by the original method can be determined.
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Citations
29 Claims
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1. A method for detecting an approach or a touch of a small area, comprising:
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obtaining an image of change in capacitive coupling from a capacitive touch sensor, wherein the capacitive touch sensor includes a plurality of driven conductive strips driven by a driving signal and a plurality of sensed conductive strips providing changes in capacitive coupling, each time the driving signal is provided, one or more intersections between one or more of the conductive strips being simultaneously driven by the driving signal and each sensed conductive strip generate capacitive coupling, and each value in the image of change in capacitive coupling is the change in capacitive coupling for one of the intersections; detecting each detected intersection from the image of change in capacitive coupling, wherein the value of the detected intersection is smaller than a first threshold and larger than a second threshold; detecting each first region, wherein each first region includes one of the detected intersections and an intersection adjacent to the detected intersection, and the sum of values of the first region is greater than the first threshold; detecting each second region if no first region is detected, wherein each second region includes four adjacent intersections including one of the detected intersections, and the sum of values of the second region is greater than the first threshold; and determining a first region or a second region approached or touched by an external conductive object when at least one first region or at least one second region is detected, wherein the values of all intersections adjacent to the first region or the second region approached or touched by the external conductive object are all smaller than a third threshold. - View Dependent Claims (2, 3, 4, 5)
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6. A device for detecting an approach or a touch of a small area, comprising:
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a means for obtaining an image of change in capacitive coupling from a capacitive touch sensor, wherein the capacitive touch sensor includes a plurality of driven conductive strips driven by a driving signal and a plurality of sensed conductive strips providing changes in capacitive coupling, each time the driving signal is provided, one or more intersections between one or more of the conductive strips being simultaneously driven by the driving signal and each sensed conductive strip generate capacitive coupling, and each value in the image of change in capacitive coupling is the change in capacitive coupling for one of the intersections; a means for detecting each detected intersection from the image of change in capacitive coupling, wherein the value of the detected intersection is smaller than a first threshold and larger than a second threshold; a means for detecting each first region, wherein each first region includes one of the detected intersections and an intersection adjacent to the detected intersection, and the sum of values of the first region is greater than the first threshold; a means for detecting each second region if no first region is detected, wherein each second region includes four adjacent intersections including one of the detected intersections, and the sum of values of the second region is greater than the first threshold; and a means for determining a first region or a second region approached or touched by an external conductive object when at least one first region or at least one second region is detected, wherein the values of all intersections adjacent to the first region or the second region approached or touched by the external conductive object are all smaller than a third threshold. - View Dependent Claims (7, 8, 9, 10)
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11. A method for detecting an approach or a touch of a small area, comprising:
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obtaining an image of change in capacitive coupling from a capacitive touch sensor, wherein the capacitive touch sensor includes a plurality of driven conductive strips driven by a driving signal and a plurality of sensed conductive strips providing changes in capacitive coupling, each time the driving signal is provided, one or more intersections between one or more of the conductive strips being simultaneously driven by the driving signal and each sensed conductive strip generate capacitive coupling, and each value in the image of change in capacitive coupling is the change in capacitive coupling for one of the intersections; detecting each detected intersection from the image of change in capacitive coupling, wherein the value of the detected intersection is smaller than a first threshold and larger than a second threshold; detecting each first region, wherein each first region includes one of the detected intersections and an intersection adjacent to the detected intersection, and the sum of values of the first region is greater than the first threshold; and when at least one first region is detected, detecting a first region approached or touched by an external conductive object, wherein the values of all intersections adjacent to the first region approached or touched by the external conductive object are all smaller than a third threshold. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A device for detecting an approach or a touch of a small area, comprising:
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a means for obtaining an image of change in capacitive coupling from a capacitive touch sensor, wherein the capacitive touch sensor includes a plurality of driven conductive strips driven by a driving signal and a plurality of sensed conductive strips providing changes in capacitive coupling, each time the driving signal is provided, one or more intersections between one or more of the conductive strips being simultaneously driven by the driving signal and each sensed conductive strip generate capacitive coupling, and each value in the image of change in capacitive coupling is the change in capacitive coupling for one of the intersections; a means for detecting each detected intersection from the image of change in capacitive coupling, wherein the value of the detected intersection is smaller than a first threshold and larger than a second threshold; a means for detecting each first region, wherein each first region includes one of the detected intersections and an intersection adjacent to the detected intersection, and the sum of values of the first region is greater than the first threshold; and a means for detecting a first region approached or touched by an external conductive object when at least one first region is detected, wherein the values of all intersections adjacent to the first region approached or touched by the external conductive object are all smaller than a third threshold. - View Dependent Claims (18, 19, 20, 21, 22)
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23. A method for detecting an approach or a touch of a small area, comprising:
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obtaining an image of change in capacitive coupling from a capacitive touch sensor, wherein the capacitive touch sensor includes a plurality of driven conductive strips driven by a driving signal and a plurality of sensed conductive strips providing changes in capacitive coupling, each time the driving signal is provided, one or more intersections between one or more of the conductive strips being simultaneously driven by the driving signal and each sensed conductive strip generate capacitive coupling, and each value in the image of change in capacitive coupling is the change in capacitive coupling for one of the intersections; detecting each intersection with a value greater than a first threshold from the image of change in capacitive coupling; and determining a single intersection of an approach or a touch of a small area by each external conductive object when at least one intersection with the value greater than the first threshold is detected, wherein all intersections adjacent to the single intersection of the approach or touch of a small area by each external conductive object are all smaller than the first threshold. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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Specification