SINGLE-CHIP MULTI-STIMULUS SENSOR CONTROLLER
First Claim
1. An integrated multi-touch controller comprising:
- drive circuitry configured to be coupled to drive lines of a touch sensor panel and capable of applying a plurality of stimulation signals simultaneously to a plurality of the drive lines;
receive circuitry configured to be coupled to sense lines of the touch sensor panel and capable of receiving sense signals generated in response to the plurality of stimulation signals; and
processing circuitry coupled to the receive circuitry, the processing circuitry comprising;
a demodulator capable of obtaining first capacitance measurements from the sense signals; and
a decoder capable of obtaining second capacitance measurements corresponding to sensing nodes from the first capacitance measurements.
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Abstract
A multi-stimulus controller for a multi-touch sensor is formed on a single integrated circuit (single-chip). The multi-stimulus controller includes a transmit oscillator, a transmit signal section that generates a plurality of drive signals based on a frequency of the transmit oscillator, a plurality of transmit channels that transmit the drive signals simultaneously to drive the multi-touch sensor, a receive channel that receives a sense signal resulting from the driving of the multi-touch sensor, a receive oscillator, and a demodulation section that demodulates the received sense signal based on a frequency of the receive oscillator to obtain sensing results, the demodulation section including a demodulator and a vector operator.
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Citations
20 Claims
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1. An integrated multi-touch controller comprising:
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drive circuitry configured to be coupled to drive lines of a touch sensor panel and capable of applying a plurality of stimulation signals simultaneously to a plurality of the drive lines; receive circuitry configured to be coupled to sense lines of the touch sensor panel and capable of receiving sense signals generated in response to the plurality of stimulation signals; and processing circuitry coupled to the receive circuitry, the processing circuitry comprising; a demodulator capable of obtaining first capacitance measurements from the sense signals; and a decoder capable of obtaining second capacitance measurements corresponding to sensing nodes from the first capacitance measurements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification