Patent application number | Description | Published |
20110032210 | TOUCH SENSING CIRCUIT AND TOUCH SENSING METHOD - 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. | 02-10-2011 |
20110074446 | Capacitance Measurement Circuit and Method Therefor - 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. | 03-31-2011 |
20110115503 | Capacitance Measurement Circuit and Method Therefor - A capacitance measurement circuit includes: a reference capacitor selectively coupled to a first reference voltage or a second reference voltage; a sensor capacitor selectively coupled to the first reference voltage or the second reference voltage; an operation amplifier coupled to the reference capacitor, the sensor capacitor and a third reference voltage; an approximation unit coupled to the operation amplifier; and a conversion unit coupled to the operation amplifier and the approximation unit. The reference capacitor and the sensor capacitor respectively couple a first charge amount and a second charge amount to a first input terminal of the operational amplifier to conduct an input voltage. The conversion unit couples a third charge amount to the first input terminal of the operation amplifier or charges/discharges the first input terminal of the operation amplifier until the input voltage approximates the third reference voltage. | 05-19-2011 |
20110210938 | Capacitance Offset Compensation for Electronic Device - An electronic device includes: a touch input device, a touch sensing circuit coupled to the touch input device and a capacitance offset compensation circuit. The capacitance offset compensation circuit includes: a first offset compensation capacitance array, coupled to a reference voltage or a driving signal in response to a control signal from the touch sensing circuit, coupled to one of a first coupling voltage and a second coupling voltage from the touch input device in response to the control signal. The first offset compensation capacitance array adjusts an output equivalent capacitance in response to the control signal, for compensating at least one of a GND parasitic capacitance and a cross coupling capacitance of the touch input device. | 09-01-2011 |
20110242049 | Touch Input Electronic Device - 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. | 10-06-2011 |
20120038573 | Touch Input Device and Scanning Method Thereof - A touch panel includes a plurality of X-directional sensing lines and a plurality of Y-directional sensing lines. The X-directional sensing lines and the Y-directional sensing lines are arranged in a staggered manner, and a plurality of mutual capacitors are formed between every X-directional sensing line and every Y-directional sensing line. According to one embodiment of the present invention, the scanning method first selects the number of sensing lines to be measured to determine a measurement channel. Driving signals are applied to other sensing lines excluding the measurement channel in scanning procedures. After the driving signals are applied, two voltages at nodes of the measurement channel are detected to obtain a touch position on the touch panel. | 02-16-2012 |
20120182255 | CONTROL DEVICE FOR A TOUCH PANEL - 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. | 07-19-2012 |
20120200358 | COMPARATOR - 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. | 08-09-2012 |
20130076376 | CAPACITANCE MEASUREMENT CIRCUIT AND METHOD THEREFOR - 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. | 03-28-2013 |
20130076377 | CAPACITANCE MEASUREMENT CIRCUIT AND METHOD THEREFOR - 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. | 03-28-2013 |
20140028622 | TOUCH INPUT ELECTRONIC DEVICE - 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. | 01-30-2014 |