Abstract: A capacitance measurement circuit includes an operation amplifier; a reference capacitor having a first terminal coupled to a first input terminal of the operation amplifier and a second terminal selectively coupled to a first or second reference voltage; a sensor capacitor having a first terminal coupled to a second input terminal of the operation amplifier and a second terminal selectively coupled to the first or second reference voltage; an approximation unit having an output terminal and an input terminal coupled to an output terminal of the operation amplifier; a conversion unit having an output terminal and an input terminal coupled to the output terminal of the approximation unit; and a coupling capacitor having a first terminal coupled to the first or second input terminal of the operation amplifier and a second terminal coupled to the output terminal of the conversion unit.

Abstract: The present invention discloses a control device for a touch panel that comprises a plurality of X-directional sensing lines and Y-directional sensing lines. The X-directional sensing lines and Y-directional sensing lines are arranged in an interlaced manner. The control device comprises a clock generation circuit, a selection module, a driving signal generation circuit, a differential detection module, and a digital-to-analog conversion module. The selection module selects a first sensing line and a second sensing line from the X-directional sensing lines or Y-directional sensing lines. The driving signal generation circuit generates first and second driving signals to the first and second sensing lines, respectively. The digital to analog conversion module selectively outputs a first voltage to the first sensing line or outputs a second voltage to the second sensing line. The operation frequency of the touch panel can be increased using the control device of the present invention.

Abstract: A detection method for detecting a plurality of contacts on a touch panel which includes a plurality of first sensing axes on a first dimension and a plurality of second sensing axes on a second dimension includes: generating a preliminary sensing data according to the contacts on the touch panel; determining at least one specific sensing axis included in the plurality of first sensing axes according to the preliminary sensing data; utilizing a configuration circuit to configure a driving and receiving sequence of the plurality of first sensing axes and the plurality of second sensing axes for obtaining a sensing output; and utilizing a determining circuit to receive a completion instruction.

Abstract: The present invention provides a method of controlling a noise processing circuit of a touch panel and a related noise signal processing apparatus. At first, the present invention detects whether the touch panel is interfered with by noise. Then, according to whether the noise interferes with the touch panel, the noise processing circuit is controlled to be activated or not activated. Therefore, the noise processing circuit can be turned off if it is unnecessary, thereby to reduce the workload due to the noise processing.

Abstract: An touch input electronic device includes: a touch input device; a clock generation circuit, generating a first clock and a second clock; a touch sensing circuit, coupled to the touch input device, the touch sensing circuit operated under the first clock; a logic circuit, receiving a sensing output signal from the touch sensing circuit, the logic circuit operated under the second clock; and a conversion circuit, outputting an output voltage under control of the logic circuit, the output voltage coupled to the touch sensing circuit, the conversion circuit operated under the second clock. In response to the sensing output signal from the touch sensing circuit, the logic circuit controls the conversion circuit to adjust the output voltage to detect a capacitance variance of the touch input device.

Abstract: A touch input device for switching driving signals includes a touch panel and a panel driving circuit for driving the touch panel. The panel driving circuit includes a selecting circuit, a driving signal generating circuit, and a touch sensing circuit. The driving signal generating circuit transmits a driving signal to the touch panel. The selecting circuit includes a multiplexer, which controls sensing lines that do not comprise either an X directional measuring channel or a Y directional measuring channel to be grounded or floating in accordance with the driving signal.

Abstract: The invention discloses a touch input device and a touch sensor circuit. The touch input device includes a touch panel, a selection module and a differential detection module. The touch panel includes a plurality of capacitive nodes thereon. The selection module is electrically connected with the capacitive nodes of the touch panel. The selection module selects a first capacitive node and a second capacitive node from the capacitive nodes. The second capacitive node is close to the first capacitive node. The differential detection module, electrically connected to the selection module, is used for detecting a capacitance difference between the first capacitive node and the second capacitive node. According to the capacitance difference, the differential detection module generates a touch detection signal.

Abstract: An touch input electronic device includes: a touch input device; a clock generation circuit, generating a first clock and a second clock; a touch sensing circuit, coupled to the touch input device, the touch sensing circuit operated under the first clock; a logic circuit, receiving a sensing output signal from the touch sensing circuit, the logic circuit operated under the second clock; and a conversion circuit, outputting an output voltage under control of the logic circuit, the output voltage coupled to the touch sensing circuit, the conversion circuit operated under the second clock. In response to the sensing output signal from the touch sensing circuit, the logic circuit controls the conversion circuit to adjust the output voltage to detect a capacitance variance of the touch input device.

Abstract: The invention discloses a touch sensing circuit applied to a capacitance touch panel for detecting the position of a sensed object touching the capacitance touch panel. The touch sensing circuit includes a first signal supplying module, a second signal supplying module, a first measurement module, a second measurement module and a processing module. The first signal supplying module inputs signals in turn to first sensing lines arranging along the first direction. The second signal supplying module inputs signals in turn to second sensing lines arranging along the second direction. The first measurement module and the second measurement module are used for measuring the first equivalent capacitances of the first sensing lines and that of the second sensing lines. The processing module is coupled to first measurement module and the second measurement module for determining the position of the sensed object.

Abstract: An touch input electronic device includes: a touch input device; a clock generation circuit, generating a first clock and a second clock; a touch sensing circuit, coupled to the touch input device, the touch sensing circuit operated under the first clock; a logic circuit, receiving a sensing output signal from the touch sensing circuit, the logic circuit operated under the second clock; and a conversion circuit, outputting an output voltage under control of the logic circuit, the output voltage coupled to the touch sensing circuit, the conversion circuit operated under the second clock. In response to the sensing output signal from the touch sensing circuit, the logic circuit controls the conversion circuit to adjust the output voltage to detect a capacitance variance of the touch input device.

Abstract: The present invention provides a method of controlling a noise processing circuit of a touch panel and a related noise signal processing apparatus. At first, the present invention detects whether the touch panel is interfered with by noise. Then, according to whether the noise interferes with the touch panel, the noise processing circuit is controlled to be activated or not activated. Therefore, the noise processing circuit can be turned off if it is unnecessary, thereby to reduce the workload due to the noise processing.

Abstract: A comparator includes: a wide-swing operation transconductance amplifier (OTA), having first and second differential input pairs for receiving first and second differential input signals respectively, the wide-swing OTA generating first and second intermediate output voltages in comparing the first with the second differential input signals; a current switch group; a current mirror group, wherein when an input common mode voltage of the first and the second differential input signal tends to one of a first and a second reference voltage, one of the first and the second differential input pair is turned off, and the current switch group and the current mirror group compensate a current flowing through the other of the first and the second differential input pair; and a decision circuit coupled to the wide-swing OTA, for enlarging a voltage difference between the first and the second intermediate output voltage to output a voltage comparison output signal.

Abstract: A capacitance measurement circuit includes an operation amplifier; a reference capacitor having a first terminal coupled to a first input terminal of the operation amplifier and a second terminal selectively coupled to a first or second reference voltage; a sensor capacitor having a first terminal coupled to a second input terminal of the operation amplifier and a second terminal selectively coupled to the first or second reference voltage; an approximation unit having an output terminal and an input terminal coupled to an output terminal of the operation amplifier; a conversion unit having an output terminal and an input terminal coupled to the output terminal of the approximation unit; and a coupling capacitor having a first terminal coupled to the first or second input terminal of the operation amplifier and a second terminal coupled to the output terminal of the conversion unit.

Abstract: A touch input device for switching driving signals includes a touch panel and a panel driving circuit for driving the touch panel. The panel driving circuit includes a selecting circuit, a driving signal generating circuit, and a touch sensing circuit. The driving signal generating circuit transmits a driving signal to the touch panel. The selecting circuit includes a multiplexer, which controls sensing lines that do not comprise either an X directional measuring channel or a Y directional measuring channel to be grounded or floating in accordance with the driving signal.

Abstract: A control device of an ungrounded touch-sensing panel is disclosed. The touch-sensing panel includes a plurality of first-directional lines and a plurality of second-directional lines arranged intersecting one another. The control device includes a selection circuit, at least one capacitor, a driving signal generation circuit, an analog to digital conversion module and a signal processing unit. The selection circuit is configured to select at least one scan line and at least one sense line from the first-directional lines and the second-directional lines during each scanning operation. After the new scan line and sense line are generated, each capacitor is coupled between each scan line and each sense line selected by the selection circuit to increase a total capacitance between the scan line and the sense line.

Abstract: A comparator includes: a wide-swing operation transconductance amplifier (OTA), having first and second differential input pairs for receiving first and second differential input signals respectively, the wide-swing OTA generating first and second intermediate output voltages in comparing the first with the second differential input signals; a current switch group; a current mirror group, wherein when an input common mode voltage of the first and the second differential input signal tends to one of a first and a second reference voltage, one of the first and the second differential input pair is turned off, and the current switch group and the current mirror group compensate a current flowing through the other of the first and the second differential input pair; and a decision circuit coupled to the wide-swing OTA, for enlarging a voltage difference between the first and the second intermediate output voltage to output a voltage comparison output signal.

Abstract: The present invention discloses a control device for a touch panel that comprises a plurality of X-directional sensing lines and Y-directional sensing lines. The X-directional sensing lines and Y-directional sensing lines are arranged in an interlaced manner. The control device comprises a clock generation circuit, a selection module, a driving signal generation circuit, a differential detection module, and a digital-to-analog conversion module. The selection module selects a first sensing line and a second sensing line from the X-directional sensing lines or Y-directional sensing lines. The driving signal generation circuit generates first and second driving signals to the first and second sensing lines, respectively. The digital to analog conversion module selectively outputs a first voltage to the first sensing line or outputs a second voltage to the second sensing line. The operation frequency of the touch panel can be increased using the control device of the present invention.

Abstract: A detection method for detecting a plurality of contacts on a touch panel which includes a plurality of first sensing axes on a first dimension and a plurality of second sensing axes on a second dimension includes: generating a preliminary sensing data according to the contacts on the touch panel; determining at least one specific sensing axis included in the plurality of first sensing axes according to the preliminary sensing data; utilizing a configuration circuit to configure a driving and receiving sequence of the plurality of first sensing axes and the plurality of second sensing axes for obtaining a sensing output; and utilizing a determining circuit to receive a completion instruction.

Abstract: A detection method for detecting a plurality of contacts on a touch panel includes: generating a preliminary sensing data according to the contacts on the touch panel; determining a plurality of first specific sensing axes included in a plurality of first sensing axes and a plurality of f second specific sensing axes included in a plurality of second sensing axes according to the preliminary sensing data; utilizing a configuration circuit to configure a driving and receiving sequence of the plurality of first sensing axes and the plurality of second sensing axes for obtaining a first sensing data and a second sensing data; and utilizing a determining circuit to receive a completion instruction, wherein when the determining circuit receives the completion instruction, the determining circuit determines a touch detection result according to the first sensing data and the second sensing data.

Abstract: A detection method for detecting a touch event on a touch panel includes a plurality of first sensing axes on a first dimension, and a plurality of second sensing axes on a second dimension. The detection method includes: regarding each first sensing axis, choosing another first sensing not neighboring with the first sensing axis as a first reference axis, and utilizing the first sensing axis and the first reference axis to derive a first sensing data corresponding to the first sensing axis; utilizing the second axes to derive a second sensing data corresponding to each second sensing axis; and utilizing first sensing data respectively corresponding to the first sensing axes and second sensing data respectively corresponding to the second sensing axes to derive a touch event detection result.