Active matrix capacitive touch sensor
First Claim
1. A system comprising:
- a capacitive sensor comprising;
a plurality of capacitive sense pads;
a plurality of primary ring oscillators, each primary ring oscillator coupled to a respective capacitive sense pad;
a plurality of reference ring oscillators, each reference ring oscillator associated with a respective primary ring oscillator;
a plurality of row traces, each row trace coupled to at least one primary ring oscillator and a reference ring oscillator for each primary ring oscillator of the at least one primary ring oscillator;
at least one sensor column trace coupled to one primary ring oscillator for each row trace of the plurality of row traces; and
at least one reference column trace coupled to one reference ring oscillator for each row trace of the plurality of row traces; and
a controller configured to receive a parameter associated with the plurality of primary ring oscillators and the plurality of reference ring oscillators, and determine an operation associated with the received parameter.
2 Assignments
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Accused Products
Abstract
Examples of the disclosure provide an active matrix capacitive touch sensor. In some examples, a sensor includes a plurality of primary ring oscillators, a plurality of reference ring oscillators, wherein each reference ring oscillator is associated with a respective primary ring oscillator, at least one row trace, wherein each row trace is coupled to at least one primary ring oscillator and a reference ring oscillator for each primary ring oscillator, at least one sensor column trace coupled to one primary ring oscillator for each row trace, and at least one reference column trace coupled to one reference ring oscillator for each row trace. Examples of the disclosure enable touch-screen technology to provide increased pad sensitivity and multi-touch capability in a cost-effective and scalable manner.
17 Citations
20 Claims
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1. A system comprising:
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a capacitive sensor comprising; a plurality of capacitive sense pads; a plurality of primary ring oscillators, each primary ring oscillator coupled to a respective capacitive sense pad; a plurality of reference ring oscillators, each reference ring oscillator associated with a respective primary ring oscillator; a plurality of row traces, each row trace coupled to at least one primary ring oscillator and a reference ring oscillator for each primary ring oscillator of the at least one primary ring oscillator; at least one sensor column trace coupled to one primary ring oscillator for each row trace of the plurality of row traces; and at least one reference column trace coupled to one reference ring oscillator for each row trace of the plurality of row traces; and a controller configured to receive a parameter associated with the plurality of primary ring oscillators and the plurality of reference ring oscillators, and determine an operation associated with the received parameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A sensor comprising:
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a plurality of first oscillators; a plurality of second oscillators, each second oscillator of the plurality of second oscillators associated with a respective first oscillator of the plurality of first oscillators; at least one row trace, each row trace of the at least one row trace coupled to at least one first oscillator of the plurality of first oscillators and a second oscillator of the plurality of second oscillator for each first oscillator of the at least one first oscillator; at least one first column trace coupled to one first oscillator of the plurality of first oscillators for each row trace of the at least one row trace; and at least one second column trace coupled to one second oscillator of the plurality of second oscillators for each row trace of the at least one row trace. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A system comprising:
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a sensor comprising; a plurality of sense pads; a plurality of first oscillators, each first oscillator coupled to a respective sense pad; a plurality of second oscillators, each second oscillator associated with a respective first oscillator; a plurality of row traces, each row trace coupled to at least one first oscillator and a second oscillator for each first oscillator of the at least one first oscillator; at least one first column trace coupled to one first oscillator for each row trace of the plurality of row traces; and at least one second column trace coupled to one second oscillator for each row trace of the plurality of row traces; and a circuit configured to receive a parameter associated with the plurality of first oscillators and the plurality of second oscillators, and determine an operation associated with the received parameter. - View Dependent Claims (19, 20)
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Specification