Readout Circuit for Touch Sensor
First Claim
1. A readout circuit connected to each of readout lines from a touch sensor, comprising:
- a comparative circuit for setting an input range of a readout signal from the readout line as well as scaling the readout signal to be a required driving range and forwarding the readout signal scaled thus as a touch sensing signal; and
an analog to digital converter for converting the touch sensing signal from the comparative circuit as a digital sensing signal and forwarding the digital sensing signal.
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Abstract
The present invention relates to a readout circuit for a touch sensor which can increase touch sensing sensitivity regardless of a process variation and a driving voltage of the touch sensor.
The readout circuit includes a comparative circuit for setting an input range of a readout signal from the readout line as well as scaling the readout signal to be a required driving range and forwarding the readout signal scaled thus as a touch sensing signal, and an analog to digital converter for converting the touch sensing signal from the comparative circuit as a digital sensing signal and forwarding the digital sensing signal.
16 Citations
9 Claims
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1. A readout circuit connected to each of readout lines from a touch sensor, comprising:
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a comparative circuit for setting an input range of a readout signal from the readout line as well as scaling the readout signal to be a required driving range and forwarding the readout signal scaled thus as a touch sensing signal; and an analog to digital converter for converting the touch sensing signal from the comparative circuit as a digital sensing signal and forwarding the digital sensing signal. - View Dependent Claims (2, 3)
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4. A readout circuit connected to each of readout lines from a touch sensor, comprising:
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a plurality of comparative circuits for setting input ranges of a readout signal from the readout line different from one another as well as scaling the readout signal to be required driving ranges different from one another and forwarding the readout signals scaled thus as a plurality of touch sensing signals, respectively; and a plurality of analog to digital converters for converting the touch sensing signals from the plurality of comparative circuits as digital sensing signals and forwarding the digital sensing signals, respectively. - View Dependent Claims (5, 6, 7, 8, 9)
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Specification