TOUCH SENSING APPARATUS WITH DIFFERENTIAL SIGNAL SOURCE
First Claim
1. A touch sensing apparatus, comprising:
- one or more touch sensing units, each touch sensing unit comprising;
a differential signal source for generating two signals which have a same frequency but reverse phases; and
two sensors for receiving a signal of a user'"'"'s touch, wherein one sensor is connected to an anode of the differential signal source and the other sensor is connected to a cathode of the differential signal source;
a detector for converting the received signal into a digital signal, wherein an input terminal of the detector is connected to the sensors of the touch sensing units; and
a signal processing unit for determining which sensor is touched according to a frequency and phase of the digital signal output from the detector, wherein the signal processing unit is connected to an output terminal of the detector.
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Accused Products
Abstract
A preferred embodiment of the touch sensing apparatus includes one or more touch sensing units, a detector, and a signal processing unit. Each touch sensing unit comprises: a differential signal source for generating two signals which have a same frequency but reverse phases; and two sensors for receiving a touch signal of a user'"'"'s finger. One sensor is connected to an anode of the differential signal source, and the other sensor is connected to a cathode of the differential signal source. The detector is for converting the received signal into a digital signal. An input terminal of the detector is connected to the sensors of each touch sensing unit. The signal processing unit is for determining which sensor is touched according to the frequency and phase of the signal output from the detector. The signal processing unit is connected to an output terminal of the detector. The touch sensing unit may further include a reference signal circuit.
16 Citations
11 Claims
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1. A touch sensing apparatus, comprising:
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one or more touch sensing units, each touch sensing unit comprising;
a differential signal source for generating two signals which have a same frequency but reverse phases; and
two sensors for receiving a signal of a user'"'"'s touch, wherein one sensor is connected to an anode of the differential signal source and the other sensor is connected to a cathode of the differential signal source;
a detector for converting the received signal into a digital signal, wherein an input terminal of the detector is connected to the sensors of the touch sensing units; and
a signal processing unit for determining which sensor is touched according to a frequency and phase of the digital signal output from the detector, wherein the signal processing unit is connected to an output terminal of the detector. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A touch sensing unit comprising:
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a differential signal source for generating two signals which have a same frequency but reverse polarities;
two sensors for receiving a signal of a user'"'"'s touch, wherein one sensor is connected to an anode of the differential signal source, and the other sensor is connected to a cathode of the differential signal source. - View Dependent Claims (9, 10, 11)
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Specification