CAPACITIVE TOUCH SENSING DEVICE AND DETECTION METHOD THEREOF
First Claim
1. A capacitive touch sensing device, comprising:
- a first electrode and a second electrode configured to form a coupling capacitance;
a drive unit configured to input a drive signal to the first electrode;
a detection circuit, coupled to the second electrode, configured to detect a detection signal coupled to the second electrode from the drive signal through the coupling capacitance and to modulate the detection signal respectively with two signals to generate a two-dimensional detection vector; and
a processing unit configured to calculate a norm of vector of the two-dimensional detection vector and to compare the norm of vector with a threshold so as to identify a touch event.
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Abstract
There is provided a capacitive touch sensing device including a sensing element, a drive unit, a detection circuit and a processing unit. The sensing element has a first electrode and a second electrode configured to form a coupling capacitance therebetween. The drive unit is configured to input a drive signal to the sensing element. The detection circuit is configured to detect a detection signal coupled to the second electrode from the drive signal through the coupling capacitance and to modulate the detection signal respectively with two signals to generate a two-dimensional detection vector. The processing unit identifies a touch event according to the two-dimensional detection vector.
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Citations
20 Claims
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1. A capacitive touch sensing device, comprising:
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a first electrode and a second electrode configured to form a coupling capacitance; a drive unit configured to input a drive signal to the first electrode; a detection circuit, coupled to the second electrode, configured to detect a detection signal coupled to the second electrode from the drive signal through the coupling capacitance and to modulate the detection signal respectively with two signals to generate a two-dimensional detection vector; and a processing unit configured to calculate a norm of vector of the two-dimensional detection vector and to compare the norm of vector with a threshold so as to identify a touch event. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A detection method of a capacitive touch sensing device, the capacitive touch sensing device comprising a sensing element, which comprises a first electrode and a second electrode configured to form a coupling capacitance, the detection method comprising:
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inputting a drive signal to the first electrode of the sensing element; modulating a detection signal coupled to the second electrode from the drive signal through the coupling capacitance respectively with two signals so as to generate a pair of modulated detection signals; and calculating a scale of the pair of the modulated detection signals to accordingly identify a touch event. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A capacitive touch sensing device, comprising:
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a capacitive sensing matrix comprising a plurality of sensing elements arranged in matrix and each of the sensing elements comprising a first electrode and a second electrode configured to form a coupling capacitance; a plurality of drive units, coupled to the first electrode of the sensing elements, configured to sequentially output a drive signal to the first electrode; a detection circuit, coupled to the second electrode of the sensing elements, configured to sequentially detect a detection signal coupled to the second electrode from the drive signal through the coupling capacitance and to modulate the detection signal respectively with two signals so as to generate a pair of modulated detection signals; and a processing unit configured to identify a touch event and a touch position according to the pair of the modulated detection signals. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification