TOUCH SCREEN CONTROLLER USING DIFFERENTIAL SIGNAL PROCESSING
First Claim
1. A touch screen controller using differential signal processing, the touch screen controller comprising:
- a charge amplifier configured to convert a charge output from a touch panel into a voltage and output a single-ended signal;
a first variable gain amplifier configured to remove an offset except for touch information existing on a path sensing signal preset for differential processing of the single-ended signal output from the charge amplifier;
at least one second variable gain amplifier configured to remove an offset between channels while referring to a line signal input to the first variable gain amplifier;
a channel integrator configured to perform an integration on the signal output from the first and the at least one second variable gain amplifiers from a first channel and returning a common reference to a pixel result; and
a linearizer configured to perform a linearization by detecting a linearization factor and a phase error of an output signal of the channel integrator.
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Abstract
A touch screen controller using differential signal processing includes a charge amplifier, a first variable gain amplifier, one or more second variable gain amplifiers, a channel integrator, and a linearizer. The charge amplifier converts a charge output from a touch panel into a voltage and output a single-ended signal. The first variable gain amplifier removes an offset except touch information existing on a path sensing signal. The one or more second variable gain amplifiers removes an offset between channels while referring to a line signal input to the first variable gain amplifier. The channel integrator performs integration on the signal output from the first and the second variable gain amplifier and return a common reference to a pixel result, and the linearizer performs linearization by detecting a linearization factor and a phase error of the output signal of the channel integrator.
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Citations
20 Claims
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1. A touch screen controller using differential signal processing, the touch screen controller comprising:
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a charge amplifier configured to convert a charge output from a touch panel into a voltage and output a single-ended signal; a first variable gain amplifier configured to remove an offset except for touch information existing on a path sensing signal preset for differential processing of the single-ended signal output from the charge amplifier; at least one second variable gain amplifier configured to remove an offset between channels while referring to a line signal input to the first variable gain amplifier; a channel integrator configured to perform an integration on the signal output from the first and the at least one second variable gain amplifiers from a first channel and returning a common reference to a pixel result; and a linearizer configured to perform a linearization by detecting a linearization factor and a phase error of an output signal of the channel integrator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A touch screen controller using differential signal processing, the touch screen controller comprising:
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a charge amplifier configured to convert a charge output from a touch panel into a voltage and output a single-ended signal; a demodulator configured to convert a phase of a demodulated waveform to a phase of each path sensing signal included, in the output single-ended signal; a first variable gain amplifier configured to remove an offset except for touch information existing on a path sensing signal preset for differential processing of a signal output from the demodulator; at least one second variable gain amplifier configured to remove an offset between channels while referring to a line signal input to the first variable gain amplifier; a channel integrator configured to perform an integration on a signal output from the first and the at least one second variable gain amplifiers from a first channel and returning a common reference to a pixel result; and a linearizer configured to perform a linearization by detecting a linearization factor and a phase error of an output signal of the channel integrator. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification