BANDWIDTH ENHANCEMENT FOR A TOUCH SENSOR PANEL
First Claim
1. A capacitive touch sensor panel, comprising:
- a plurality of sense lines formed on one side of a substrate;
a plurality of drive lines formed on a same side of the substrate as the plurality of sense lines, the plurality of drive lines configured for receiving one or more stimulation signals, the plurality of sense lines and the plurality of drive lines forming an array of capacitive sensors; and
a bandwidth enhancement strip formed between one or more of the drive lines and one or more of the sense lines for increasing a capacitance of one or more of the capacitive sensors in response to a frequency increase of the one or more stimulation signals.
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Accused Products
Abstract
A system is disclosed for enhancing the stimulation signal bandwidth for a touch sensor panel and maintaining relatively uniform touch sensitivity over the touch sensor panel surface. In one embodiment, a bandwidth enhancement circuit is coupled in parallel to a sensor circuit. The sensor circuit includes a source of stimulating voltage, a drive line, a sense line, and a charge amplifier. The drive line and the sense line are coupled with each other by a mutual capacitance Csig. The bandwidth enhancement circuit can be a RC circuit coupled in parallel to the sensor circuit. The bandwidth enhancement circuit can be represented by two serially coupled resistors, each of which is also coupled to ground on one end, and two capacitors. In particular, one of the capacitors couples the bandwidth enhancement circuit to the drive line, and the other capacitor couples the bandwidth enhancement circuit to the sense line.
204 Citations
27 Claims
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1. A capacitive touch sensor panel, comprising:
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a plurality of sense lines formed on one side of a substrate; a plurality of drive lines formed on a same side of the substrate as the plurality of sense lines, the plurality of drive lines configured for receiving one or more stimulation signals, the plurality of sense lines and the plurality of drive lines forming an array of capacitive sensors; and a bandwidth enhancement strip formed between one or more of the drive lines and one or more of the sense lines for increasing a capacitance of one or more of the capacitive sensors in response to a frequency increase of the one or more stimulation signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A capacitive sensor, comprising:
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a sense electrode formed on one side of a substrate; a drive electrode formed on a same side of the substrate as the sense electrode and capacitively coupled to the drive electrode, the drive electrode configured for receiving one or more stimulation signals; and a bandwidth enhancement strip formed between the drive and sense electrode for providing a parallel path for capacitive coupling between the drive and sense electrode. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A bandwidth enhancement strip for a capacitive sensor array having a plurality of drive and sense lines, comprising:
a strip of conductive material formed between one or more of the drive and sense lines for providing a parallel path for capacitive coupling between the one or more drive and sense lines. - View Dependent Claims (19, 20, 21, 22)
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23. A method for enhancing the bandwidth of a capacitive touch sensor panel, comprising:
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forming a plurality of sense lines on one side of a substrate; forming a plurality of drive lines on a same side of the substrate as the plurality of sense lines; configuring the plurality of drive lines for receiving one or more stimulation signals; forming an array of capacitive sensors from the plurality of sense lines and the plurality of drive lines; and forming a bandwidth enhancement strip between one or more of the drive lines and one or more of the sense lines for increasing a capacitance between one or more of the capacitive sensors in response to a frequency increase of the one or more stimulation signals. - View Dependent Claims (24, 25, 26)
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27. A handheld electronic device including a capacitive touch sensor penal, the capacitive touch sensor panel comprising:
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a plurality of sense lines formed on one side of a substrate; a plurality of drive lines formed on a same side of the substrate as the plurality of sense lines, the plurality of drive lines configured for receiving one or more stimulation signals, the plurality of sense lines and the plurality of drive lines forming an array of capacitive sensors; and a bandwidth enhancement strip formed between one or more of the drive lines and one or more of the sense lines for increasing a capacitance between one or more of the capacitive sensors in response to a frequency increase of the one or more stimulation signals.
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Specification